/* ExcelQuickly, design system
 * Ledger green, ink, grid-line grey, mist, highlighter amber.
 * Open Sans throughout; a system monospace face only inside formulas and the formula bar.
 */
:root {
  --excel: #107C41;
  --ledger: #107C41;
  --ledger-600: #0C6234;
  --ledger-50: #E7F3EC;
  --ledger-100: #CBE6D6;
  --ink: #13221B;
  --ink-2: #33443B;
  --muted: #5B6B63;
  --grid: #D9E2DD;
  --grid-2: #E8EEEA;
  --mist: #F3F6F4;
  --paper: #FFFFFF;
  --marker: #F5B83D;
  --marker-50: #FEF4DC;
  --bad: #B42318;
  --bad-50: #FEF3F2;
  --info: #1D4ED8;
  --font: "Open Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --r-sm: 6px;
  --r: 10px;
  --r-lg: 16px;
  --shadow: 0 1px 2px rgba(19, 34, 27, .06), 0 8px 24px -12px rgba(19, 34, 27, .18);
  --wrap: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }
body { margin: 0; font: 400 16px/1.6 var(--font); color: var(--ink); background: var(--paper); text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; }
a { color: var(--ledger); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ledger-600); }
:focus-visible { outline: 2px solid var(--ledger); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 .5em; font-weight: 600; }
h1 { font-size: clamp(2.1rem, 4.4vw, 3.4rem); letter-spacing: -0.028em; }
h2 { font-size: clamp(1.6rem, 2.8vw, 2.25rem); letter-spacing: -0.022em; }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
code.f, pre.f, .mono { font-family: var(--mono); font-size: .9em; }
code.f { background: var(--mist); border: 1px solid var(--grid-2); padding: 1px 6px; border-radius: 4px; color: var(--ink); white-space: nowrap; }
pre.f { background: var(--ink); color: #E9F4EE; padding: 14px 16px; border-radius: var(--r-sm); overflow-x: auto; line-height: 1.7; margin: 0 0 1.2em; }
kbd { font: 500 12.5px/1 var(--font); background: var(--paper); border: 1px solid #C5D1CB; border-bottom-width: 2px; border-radius: 5px; padding: 3px 7px; color: var(--ink); white-space: nowrap; }

/* ---------- buttons & forms ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 600 15px/1 var(--font); padding: 13px 20px; border-radius: 8px; border: 1px solid transparent; cursor: pointer; text-decoration: none; transition: background .15s, border-color .15s, color .15s; white-space: nowrap; }
.btn-primary { background: var(--ledger); color: #fff; }
.btn-primary:hover { background: var(--ledger-600); color: #fff; }
.btn-ghost { background: var(--paper); color: var(--ink); border-color: var(--grid); }
.btn-ghost:hover { border-color: var(--ink-2); color: var(--ink); }
.btn-marker { background: var(--marker); color: var(--ink); }
.btn-marker:hover { background: #E9A623; color: var(--ink); }
.btn-danger { background: var(--paper); color: var(--bad); border-color: #F4C7C2; }
.btn-danger:hover { background: var(--bad-50); color: var(--bad); }
.btn-sm { padding: 8px 12px; font-size: 14px; border-radius: 7px; }
.btn-lg { padding: 16px 26px; font-size: 17px; }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.link-btn { background: none; border: 0; padding: 0; font: inherit; color: var(--ledger); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }

.field { margin-bottom: 16px; }
.field label, .label { display: block; font-weight: 500; font-size: 14px; margin-bottom: 6px; color: var(--ink-2); }
.input, .field input:not([type=checkbox]):not([type=radio]), .field select, .field textarea {
  width: 100%; font: 400 16px/1.4 var(--font); color: var(--ink); background: var(--paper); border: 1px solid #C5D1CB; border-radius: 8px; padding: 11px 12px; transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field select:focus, .field textarea:focus, .input:focus { outline: 0; border-color: var(--ledger); box-shadow: 0 0 0 3px var(--ledger-50); }
.field .hint { font-size: 13px; color: var(--muted); margin-top: 5px; }
.check { display: flex; align-items: flex-start; gap: 10px; font-size: 15px; cursor: pointer; }
.check input { margin-top: 4px; accent-color: var(--ledger); width: 16px; height: 16px; }
.hp { position: absolute; left: -9999px; }

/* ---------- flash ---------- */
.flashes { position: fixed; top: 76px; right: 20px; z-index: 60; display: grid; gap: 8px; max-width: min(440px, calc(100vw - 40px)); }
.flash { background: var(--paper); border: 1px solid var(--grid);  border-radius: var(--r-sm); padding: 12px 40px 12px 14px; box-shadow: var(--shadow); font-size: 15px; position: relative; animation: flashIn .25s ease-out; }
.flash-error { border-left-color: var(--bad); }
.flash-info { border-left-color: var(--info); }
.flash button { position: absolute; right: 8px; top: 8px; background: none; border: 0; font-size: 18px; color: var(--muted); cursor: pointer; line-height: 1; padding: 4px; }
@keyframes flashIn { from { opacity: 0; transform: translateY(-6px); } }

/* ---------- header ---------- */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, .92); backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--grid-2); }
.site-header .wrap { display: flex; align-items: center; gap: 28px; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--excel); text-decoration: none; font-weight: 700; font-size: 18px; letter-spacing: -0.02em; }
.logo:hover { color: var(--excel); }
.logo svg { width: 28px; height: 28px; flex: none; }
.nav { display: flex; gap: 4px; align-items: center; }
.nav a { color: var(--ink-2); text-decoration: none; font-weight: 500; font-size: 15px; padding: 8px 12px; border-radius: 7px; }
.nav a:hover, .nav a[aria-current] { color: var(--ink); background: var(--mist); }
.header-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.cur-form select { font: 500 14px var(--font); color: var(--ink-2); border: 1px solid var(--grid); border-radius: 7px; padding: 7px 26px 7px 10px; background: var(--paper) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%235B6B63' fill='none' stroke-width='1.5'/%3E%3C/svg%3E") no-repeat right 9px center; appearance: none; cursor: pointer; }
.user-chip { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font-weight: 500; font-size: 15px; padding: 5px 10px 5px 5px; border-radius: 999px; border: 1px solid var(--grid); }
.user-chip:hover { border-color: var(--ink-2); color: var(--ink); }
.avatar { width: 28px; height: 28px; border-radius: 50%; background: var(--ledger); color: #fff; display: grid; place-items: center; font-size: 12px; font-weight: 600; }
.pill { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; font-weight: 600; padding: 3px 9px; border-radius: 999px; background: var(--ledger-50); color: var(--ledger); }
.pill-marker { background: var(--marker-50); color: #8A5A00; }
.pill-grey { background: var(--mist); color: var(--muted); }
.pill-bad { background: var(--bad-50); color: var(--bad); }
.menu-toggle { display: none; background: none; border: 1px solid var(--grid); border-radius: 7px; padding: 8px 10px; cursor: pointer; }

@media (max-width: 860px) {
  .menu-toggle { display: inline-flex; margin-left: auto; }
  .site-header .wrap { gap: 12px; }
  .nav, .header-right { display: none; }
  .site-header.open .nav, .site-header.open .header-right { display: flex; }
  .site-header.open .wrap { flex-wrap: wrap; height: auto; padding-top: 12px; padding-bottom: 12px; }
  .site-header.open .nav { order: 3; width: 100%; flex-direction: column; align-items: stretch; }
  .site-header.open .header-right { order: 4; width: 100%; margin: 4px 0 0; flex-wrap: wrap; }
}

/* ---------- hero ---------- */
.hero { padding: 72px 0 56px; background: linear-gradient(var(--paper), var(--mist)); border-bottom: 1px solid var(--grid-2); overflow: hidden; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); gap: 56px; align-items: center; }
.hero h1 { margin-bottom: 20px; max-width: 14ch; }
.hero .lede { font-size: 19px; color: var(--ink-2); max-width: 46ch; margin-bottom: 28px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 22px; }
.hero-note { font-size: 14px; color: var(--muted); }
.hero-sheet { position: relative; }
.hero-sheet .window { background: var(--paper); border: 1px solid var(--grid); border-radius: 12px; box-shadow: 0 30px 60px -30px rgba(19, 34, 27, .35), 0 2px 6px rgba(19, 34, 27, .05); overflow: hidden; }
.window-top { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--grid-2); background: var(--mist); font-size: 13px; color: var(--muted); }
.window-top i { width: 10px; height: 10px; border-radius: 50%; background: var(--grid); display: inline-block; }
.window-top span { margin-left: 8px; font-family: var(--font); font-size: 12px; }
.hero-sheet .caption { margin-top: 14px; font-size: 14px; color: var(--muted); display: flex; gap: 8px; align-items: center; }
@media (max-width: 960px) { .hero .wrap { grid-template-columns: 1fr; gap: 40px; } .hero { padding-top: 48px; } }

/* ---------- sections ---------- */
.section { padding: 88px 0; }
.section-mist { background: var(--mist); border-top: 1px solid var(--grid-2); border-bottom: 1px solid var(--grid-2); }
.section-head { max-width: 640px; margin-bottom: 44px; }
.section-head p { font-size: 18px; color: var(--ink-2); }

.how { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid var(--grid); border-radius: var(--r); background: var(--paper); overflow: hidden; }
.how > div { padding: 28px 28px 30px; border-right: 1px solid var(--grid); }
.how > div:last-child { border-right: 0; }
.how .step { font: 500 13px var(--font); color: var(--ledger); display: inline-block; border: 1.5px solid var(--ledger); padding: 2px 8px; border-radius: 4px; margin-bottom: 16px; }
.how h3 { margin-bottom: 8px; }
.how p { color: var(--ink-2); margin: 0; }
@media (max-width: 860px) { .how { grid-template-columns: 1fr; } .how > div { border-right: 0; border-bottom: 1px solid var(--grid); } .how > div:last-child { border-bottom: 0; } }

/* curriculum ledger */
.ledger { border: 1px solid var(--grid); border-radius: var(--r); background: var(--paper); overflow: hidden; }
.ledger-group { display: grid; grid-template-columns: 220px 1fr; border-bottom: 1px solid var(--grid); }
.ledger-group:last-child { border-bottom: 0; }
.ledger-cat { padding: 20px 22px; background: var(--mist); border-right: 1px solid var(--grid); }
.ledger-cat h3 { font-size: 16px; margin: 0 0 4px; }
.ledger-cat .small { color: var(--muted); }
.ledger-rows a { display: grid; grid-template-columns: 48px 1fr auto; gap: 14px; align-items: center; padding: 13px 20px; border-bottom: 1px solid var(--grid-2); text-decoration: none; color: var(--ink); }
.ledger-rows a:last-child { border-bottom: 0; }
.ledger-rows a:hover { background: #FAFCFB; }
.ledger-rows .num { font: 500 13px var(--font); color: var(--muted); }
.ledger-rows .t { font-weight: 500; }
.ledger-rows .s { display: block; font-size: 14px; color: var(--muted); font-weight: 400; margin-top: 1px; }
.ledger-rows .meta { display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--muted); }
.state-done { color: var(--ledger); }
@media (max-width: 760px) { .ledger-group { grid-template-columns: 1fr; } .ledger-cat { border-right: 0; border-bottom: 1px solid var(--grid); } .ledger-rows a { grid-template-columns: 36px 1fr; } .ledger-rows .meta { grid-column: 2; } }

.features { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 22px; }
.feature-list li { display: grid; grid-template-columns: 34px 1fr; gap: 14px; }
.feature-list .ic { width: 34px; height: 34px; border-radius: 8px; background: var(--ledger-50); color: var(--ledger); display: grid; place-items: center; }
.feature-list h3 { font-size: 17px; margin: 4px 0 4px; }
.feature-list p { margin: 0; color: var(--ink-2); }
@media (max-width: 860px) { .features { grid-template-columns: 1fr; } }

.cert-mock { background: var(--paper); border: 1px solid var(--grid); border-radius: var(--r); padding: 30px; box-shadow: var(--shadow); position: relative; }
.cert-mock .seal { position: absolute; right: 24px; top: 24px; }
.cert-mock .k { font-size: 13px; color: var(--muted); }
.cert-mock .name { font-size: 28px; font-weight: 600; letter-spacing: -0.02em; margin: 6px 0 14px; }
.cert-mock .row { display: flex; gap: 28px; border-top: 1px solid var(--grid-2); padding-top: 14px; margin-top: 16px; font-size: 14px; }
.cert-mock .row b { display: block; font-family: var(--font); font-weight: 500; font-size: 13px; }

.quotes { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.quote { background: var(--paper); border: 1px solid var(--grid); border-radius: var(--r); padding: 24px; }
.quote p { font-size: 17px; }
.quote .who { font-size: 14px; color: var(--muted); }
.quote .who b { color: var(--ink); font-weight: 600; display: block; }

.faq { max-width: 780px; }
.faq details { border-bottom: 1px solid var(--grid); padding: 18px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 17px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 22px/1 var(--font); color: var(--muted); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 12px 0 0; color: var(--ink-2); }

.cta-band { background: var(--ink); color: #E6EFEA; padding: 64px 0; }
.cta-band .wrap { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; margin: 0 0 6px; }
.cta-band p { margin: 0; color: #B9CBC1; }

/* ---------- pricing ---------- */
.pricing-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; align-items: start; }
.pricing-grid .benefits { list-style: none; padding: 0; margin: 0 0 28px; display: grid; gap: 14px; }
.pricing-grid .benefits li { display: grid; grid-template-columns: 24px 1fr; gap: 12px; font-size: 17px; }
.tick { color: var(--ledger); width: 20px; height: 20px; margin-top: 3px; }
.plan-card { background: var(--paper); border: 1px solid var(--grid); border-radius: var(--r-lg); padding: 26px; box-shadow: var(--shadow); }
.plan-card h3 { font-size: 20px; margin-bottom: 4px; }
.plan-card > p { color: var(--muted); font-size: 15px; margin-bottom: 18px; }
.plans { display: grid; gap: 10px; margin-bottom: 18px; border: 0; padding: 0; }
.plan-opt { position: relative; display: grid; grid-template-columns: 22px 1fr auto; align-items: center; gap: 12px; border: 1.5px solid var(--grid); border-radius: var(--r); padding: 16px 16px; cursor: pointer; transition: border-color .15s, background .15s; }
.plan-opt:hover { border-color: #AFC2B8; }
.plan-opt input { appearance: none; width: 20px; height: 20px; border: 1.5px solid #9FB2A8; border-radius: 50%; margin: 0; display: grid; place-items: center; }
.plan-opt input::after { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--ledger); transform: scale(0); transition: transform .12s; }
.plan-opt input:checked { border-color: var(--ledger); }
.plan-opt input:checked::after { transform: scale(1); }
.plan-opt:has(input:checked) { border-color: var(--ledger); background: #F6FAF8; }
.plan-opt .n { font-weight: 600; display: block; }
.plan-opt .d { font-size: 14px; color: var(--muted); }
.plan-opt .p { text-align: right; font-weight: 700; font-size: 20px; letter-spacing: -0.01em; white-space: nowrap; }
.plan-opt .p small { font-weight: 400; font-size: 13px; color: var(--muted); letter-spacing: 0; }
.plan-opt .tag { position: absolute; top: -11px; right: 14px; background: var(--marker); color: var(--ink); font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 999px; }
.plan-foot { text-align: center; font-size: 14px; color: var(--muted); margin-top: 14px; line-height: 1.7; }
.cur-note { font-size: 13px; color: var(--muted); margin-top: 10px; text-align: center; }
@media (max-width: 900px) { .pricing-grid { grid-template-columns: 1fr; } }

/* ---------- lessons catalog ---------- */
.page-head { padding: 48px 0 28px; border-bottom: 1px solid var(--grid-2); background: var(--mist); }
.page-head h1 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); margin-bottom: 8px; }
.page-head p { color: var(--ink-2); margin: 0; font-size: 17px; max-width: 60ch; }
.progress-strip { display: flex; gap: 28px; align-items: center; margin-top: 22px; flex-wrap: wrap; }
.meter { height: 8px; background: var(--grid-2); border-radius: 999px; overflow: hidden; width: 220px; }
.meter > span { display: block; height: 100%; background: var(--ledger); border-radius: 999px; transition: width .4s; }
.lvl { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; }
.lvl .badge { font: 600 13px var(--font); background: var(--ink); color: #fff; padding: 4px 8px; border-radius: 5px; }

/* ---------- lesson page ---------- */
.lesson-layout { display: grid; grid-template-columns: 270px minmax(0, 1fr); min-height: calc(100vh - 64px); }
.lesson-nav { border-right: 1px solid var(--grid); background: var(--mist); padding: 18px 0 40px; position: sticky; top: 64px; height: calc(100vh - 64px); overflow-y: auto; }
.lesson-nav h4 { font-size: 12.5px; font-weight: 600; color: var(--muted); margin: 18px 20px 6px; letter-spacing: 0; }
.lesson-nav a { display: grid; grid-template-columns: 20px 1fr; gap: 10px; align-items: start; padding: 7px 20px; font-size: 14.5px; color: var(--ink-2); text-decoration: none; line-height: 1.35; }
.lesson-nav a:hover { background: #E9EFEB; color: var(--ink); }
.lesson-nav a[aria-current] { background: var(--paper); color: var(--ink); font-weight: 600;  }
.lesson-nav .ico { width: 16px; height: 16px; margin-top: 2px; color: #9FB2A8; }
.lesson-nav .ico.done { color: var(--ledger); }
.lesson-nav-toggle { display: none; }
.lesson-main { padding: 34px 40px 80px; min-width: 0; }
.lesson-top { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--muted); margin-bottom: 10px; flex-wrap: wrap; }
.lesson-main h1 { font-size: clamp(1.8rem, 3vw, 2.4rem); margin-bottom: 18px; }
.lesson-body { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; }
.lesson-text { max-width: 72ch; font-size: 17px; color: var(--ink-2); }
.lesson-text ul { padding-left: 1.2em; }
.lesson-text li { margin-bottom: 6px; }
.lesson-text .note { background: var(--marker-50); border: 1px solid #F6DFA6; border-radius: var(--r-sm); padding: 14px 16px; margin: 0 0 1.2em; font-size: 16px; }
.kbd-table { border-collapse: collapse; margin-bottom: 1em; font-size: 15px; }
.kbd-table td { padding: 8px 18px 8px 0; border-bottom: 1px solid var(--grid-2); }
.lesson-footer { display: flex; justify-content: space-between; gap: 12px; margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--grid-2); flex-wrap: wrap; }

.practice { border: 1px solid var(--grid); border-radius: var(--r); background: var(--paper); overflow: hidden; box-shadow: var(--shadow); }
.practice-head { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--grid); background: var(--mist); flex-wrap: wrap; }
.practice-head h2 { font-size: 16px; margin: 0; }
.practice-head .sp { flex: 1; }
.xp-chip { font: 600 13px var(--font); color: var(--ledger); background: var(--ledger-50); padding: 4px 9px; border-radius: 5px; }
.timer { font: 600 14px var(--font); padding: 4px 10px; border-radius: 5px; background: var(--ink); color: #fff; }
.timer.low { background: var(--bad); }
.practice-body { display: grid; grid-template-columns: minmax(250px, 320px) minmax(0, 1fr); }
.tasks { border-right: 1px solid var(--grid); padding: 16px; display: flex; flex-direction: column; gap: 10px; background: #FCFDFC; }
.task { display: grid; grid-template-columns: 26px 1fr; gap: 10px; padding: 10px 10px; border-radius: 8px; font-size: 15px; color: var(--muted); line-height: 1.45; }
.task .n { width: 24px; height: 24px; border-radius: 6px; border: 1.5px solid var(--grid); display: grid; place-items: center; font: 600 12px var(--font); color: var(--muted); }
.task.is-current { background: var(--paper); color: var(--ink); box-shadow: 0 0 0 1.5px var(--marker), 0 4px 14px -8px rgba(19, 34, 27, .3); }
.task.is-current .n { border-color: var(--marker); background: var(--marker); color: var(--ink); }
.task.is-done { color: var(--ink-2); }
.task.is-done .n { background: var(--ledger); border-color: var(--ledger); color: #fff; }
.task .keys { margin-top: 6px; display: flex; gap: 4px; flex-wrap: wrap; }
.task-actions { display: flex; gap: 6px; flex-wrap: wrap; margin-top: auto; padding-top: 6px; }
.feedback { font-size: 14.5px; padding: 10px 12px; border-radius: 8px; display: none; }
.feedback.show { display: block; animation: flashIn .2s; }
.feedback.good { background: var(--ledger-50); color: var(--ledger-600); }
.feedback.bad { background: var(--bad-50); color: var(--bad); }
.feedback.info { background: var(--mist); color: var(--ink-2); }
.hintbox { font-size: 14px; background: var(--marker-50); border: 1px solid #F6DFA6; padding: 10px 12px; border-radius: 8px; display: none; }
.hintbox.show { display: block; }
.hintbox code { font-family: var(--mono); font-size: 13px; }
.sheet-host { min-width: 0; padding: 0; }
.practice-done { padding: 26px; text-align: center; border-top: 1px solid var(--grid); display: none; background: linear-gradient(#F6FAF8, var(--paper)); }
.practice-done.show { display: block; }
.practice-done h3 { margin-bottom: 4px; }
.practice-done .row { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 16px; }
.start-gate { padding: 40px 24px; text-align: center; }
@media (max-width: 1100px) { .practice-body { grid-template-columns: 1fr; } .tasks { border-right: 0; border-bottom: 1px solid var(--grid); } }
@media (max-width: 900px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-nav { position: static; height: auto; display: none; border-right: 0; border-bottom: 1px solid var(--grid); }
  .lesson-nav.open { display: block; }
  .lesson-nav-toggle { display: inline-flex; margin-bottom: 14px; }
  .lesson-main { padding: 22px 16px 60px; }
}

/* paywall */
.paywall { position: relative; }
.paywall .blur { filter: blur(5px); pointer-events: none; user-select: none; opacity: .6; max-height: 220px; overflow: hidden; }
.paywall-card { border: 1px solid var(--grid); border-radius: var(--r-lg); background: var(--paper); box-shadow: var(--shadow); padding: 30px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; margin-top: -40px; position: relative; }
.paywall-card h2 { font-size: 26px; }
@media (max-width: 860px) { .paywall-card { grid-template-columns: 1fr; padding: 22px; } }

/* ---------- spreadsheet (XSheet) ---------- */
.xs { --cell-h: 30px; font-family: var(--font); color: var(--ink); position: relative; }
.xs-bar { display: flex; align-items: stretch; border-bottom: 1px solid var(--grid); background: var(--paper); height: 38px; }
.xs-name { width: 86px; flex: none; display: flex; align-items: center; justify-content: center; font: 500 13px var(--mono); border-right: 1px solid var(--grid); color: var(--ink-2); }
.xs-fx { width: 38px; flex: none; display: flex; align-items: center; justify-content: center; border-right: 1px solid var(--grid); color: var(--muted); }
.xs-fx i { font: italic 600 14px Georgia, serif; }
.xs-formula { flex: 1; border: 0; padding: 0 12px; font: 500 14px var(--mono); color: var(--ink); background: transparent; min-width: 0; }
.xs-formula:focus { outline: 0; background: #FBFDFC; }
.xs-wrap { position: relative; overflow: auto; max-height: 470px; background: var(--paper); -webkit-overflow-scrolling: touch; }
.xs-grid { border-collapse: separate; border-spacing: 0; table-layout: fixed; font-size: 14px; user-select: none; -webkit-user-select: none; }
.xs-col-rh { width: 44px; }
.xs-grid th { background: var(--mist); color: var(--muted); font-weight: 500; font-size: 12.5px; height: 26px; border-right: 1px solid var(--grid); border-bottom: 1px solid var(--grid); position: sticky; z-index: 2; }
.xs-grid thead th { top: 0; }
.xs-grid .xs-corner { left: 0; z-index: 3; }
.xs-grid .xs-rh { left: 0; z-index: 2; font-family: var(--font); font-size: 12px; text-align: center; }
.xs-grid th.is-on { background: var(--ledger-100); color: var(--ledger-600); }
.xs-c { height: var(--cell-h); padding: 0 8px; border-right: 1px solid var(--grid-2); border-bottom: 1px solid var(--grid-2); white-space: nowrap; overflow: hidden; text-overflow: clip; cursor: cell; background: var(--paper); }
.xs-c.is-num { text-align: right; font-variant-numeric: tabular-nums; }
.xs-c.is-center { text-align: center; }
.xs-c.is-bold { font-weight: 600; }
.xs-c.is-data { background: #FBFCFB; }
.xs-c.is-err { color: var(--bad); font-weight: 500; }
.xs-c.is-in { background: #EAF3EE; }
.xs-c.is-target { background-image: repeating-linear-gradient(135deg, rgba(245, 184, 61, .18) 0 6px, rgba(245, 184, 61, .06) 6px 12px); box-shadow: inset 0 0 0 1px rgba(245, 184, 61, .9); }
.xs-sel { position: absolute; border: 2px solid var(--ledger); pointer-events: none; z-index: 4; transition: left .06s, top .06s, width .06s, height .06s; }
.xs-sel.is-clip { border-style: dashed; animation: march 1s linear infinite; }
@keyframes march { to { border-color: var(--ledger-100); } }
.xs-handle { position: absolute; right: -5px; bottom: -5px; width: 9px; height: 9px; background: var(--ledger); border: 1.5px solid #fff; pointer-events: auto; cursor: crosshair; }
.is-editing .xs-handle { display: none; }
.xs-fillbox { position: absolute; border: 2px dashed var(--ledger); pointer-events: none; z-index: 3; display: none; }
.xs-refbox { position: absolute; border: 2px solid; pointer-events: none; z-index: 3; border-radius: 1px; }
.xs-editor { position: absolute; z-index: 6; visibility: hidden; resize: none; overflow: hidden; border: 2px solid var(--ledger); padding: 4px 6px; font: 500 14px/18px var(--mono); color: var(--ink); background: #fff; box-shadow: 0 6px 18px -8px rgba(19, 34, 27, .4); white-space: pre; }
.xs-editor:focus { outline: 0; }
.xs-keytrap { position: absolute; width: 1px; height: 1px; opacity: 0; border: 0; padding: 0; resize: none; overflow: hidden; z-index: 0; }
.xs-status { min-height: 0; font-size: 13.5px; padding: 0 12px; color: var(--muted); border-top: 1px solid transparent; }
.xs-status:not(:empty) { padding: 8px 12px; border-top-color: var(--grid-2); }
.xs-status[data-kind=warn], .xs-status[data-kind=bad] { color: var(--bad); }
.xs-status[data-kind=good] { color: var(--ledger); }
.xs-demo .xs-c { cursor: default; }
.xs-demo .xs-wrap { max-height: none; overflow: hidden; }
.xs-demo .xs-handle { pointer-events: none; }

/* ---------- auth & account ---------- */
.auth-wrap { min-height: calc(100vh - 64px); display: grid; place-items: center; padding: 48px 16px; background: var(--mist); }
.auth-card { width: 100%; max-width: 430px; background: var(--paper); border: 1px solid var(--grid); border-radius: var(--r-lg); padding: 32px; box-shadow: var(--shadow); }
.auth-card h1 { font-size: 26px; margin-bottom: 6px; }
.auth-card .sub { color: var(--muted); margin-bottom: 24px; }
.auth-alt { text-align: center; margin-top: 18px; font-size: 15px; color: var(--muted); }
.panel { background: var(--paper); border: 1px solid var(--grid); border-radius: var(--r); padding: 24px; }
.panel + .panel { margin-top: 20px; }
.panel h2 { font-size: 19px; margin-bottom: 14px; }
.account-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 24px; padding: 36px 0 80px; align-items: start; }
@media (max-width: 900px) { .account-grid { grid-template-columns: 1fr; } }
.kv { display: grid; grid-template-columns: 140px 1fr; gap: 8px 16px; font-size: 15px; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }
.table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.table th { text-align: left; font-weight: 600; color: var(--muted); font-size: 13px; padding: 8px 10px; border-bottom: 1px solid var(--grid); }
.table td { padding: 10px; border-bottom: 1px solid var(--grid-2); vertical-align: middle; }
.table .r { text-align: right; }
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--grid); border: 1px solid var(--grid); border-radius: var(--r); overflow: hidden; margin-bottom: 20px; }
.stat-row > div { background: var(--paper); padding: 18px 20px; }
.stat-row b { display: block; font-size: 26px; letter-spacing: -0.02em; }
.stat-row span { font-size: 13.5px; color: var(--muted); }

/* ---------- checkout ---------- */
.checkout { display: grid; grid-template-columns: 1fr 380px; gap: 32px; padding: 40px 0 80px; align-items: start; }
.gw-list { display: grid; gap: 10px; margin: 8px 0 20px; border: 0; padding: 0; }
.gw-opt { display: grid; grid-template-columns: 22px 1fr auto; gap: 14px; align-items: center; border: 1.5px solid var(--grid); border-radius: var(--r); padding: 16px; cursor: pointer; }
.gw-opt:has(input:checked) { border-color: var(--ledger); background: #F6FAF8; }
.gw-opt input { accent-color: var(--ledger); width: 18px; height: 18px; margin: 0; }
.gw-opt .nm { font-weight: 600; }
.gw-opt .ds { font-size: 13.5px; color: var(--muted); }
.gw-opt .amt { font-weight: 700; white-space: nowrap; }
.summary-card { background: var(--mist); border: 1px solid var(--grid); border-radius: var(--r); padding: 22px; position: sticky; top: 88px; }
.summary-card .line { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--grid); font-size: 15px; }
.summary-card .line:last-of-type { border: 0; }
@media (max-width: 900px) { .checkout { grid-template-columns: 1fr; } .summary-card { position: static; } }
.result { max-width: 620px; margin: 64px auto; text-align: center; padding: 0 16px; }
.result .icon { width: 64px; height: 64px; border-radius: 16px; display: grid; place-items: center; margin: 0 auto 20px; background: var(--ledger-50); color: var(--ledger); }
.spinner { width: 26px; height: 26px; border: 3px solid var(--grid); border-top-color: var(--ledger); border-radius: 50%; animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- certificate ---------- */
.certificate { max-width: 980px; margin: 40px auto; background: var(--paper); border: 1px solid var(--grid); box-shadow: var(--shadow); aspect-ratio: 1.414; padding: 6%; position: relative; display: flex; flex-direction: column; }
.certificate::before { content: ""; position: absolute; inset: 18px; border: 1.5px solid var(--ledger); pointer-events: none; }
.certificate .grid-bg { position: absolute; inset: 18px; background-image: linear-gradient(var(--grid-2) 1px, transparent 1px), linear-gradient(90deg, var(--grid-2) 1px, transparent 1px); background-size: 64px 28px; opacity: .55; pointer-events: none; mask-image: linear-gradient(90deg, #000 0, transparent 42%); -webkit-mask-image: linear-gradient(90deg, #000 0, transparent 42%); }
.certificate > * { position: relative; }
.certificate .top { display: flex; justify-content: space-between; align-items: center; }
.certificate .k { color: var(--muted); font-size: clamp(12px, 1.5vw, 16px); }
.certificate .nm { font-size: clamp(28px, 5.2vw, 58px); font-weight: 600; letter-spacing: -0.03em; margin: 2% 0 1%; line-height: 1.05; }
.certificate .course { font-size: clamp(16px, 2.3vw, 26px); color: var(--ink-2); }
.certificate .foot { margin-top: auto; display: flex; gap: 6%; font-size: clamp(11px, 1.3vw, 14px); border-top: 1px solid var(--grid); padding-top: 2.4%; }
.certificate .foot b { display: block; font: 500 clamp(11px, 1.3vw, 14px) var(--font); color: var(--ink); }
.cert-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }
@media print { .site-header, .site-footer, .cert-actions, .flashes { display: none !important; } .certificate { box-shadow: none; border: 0; margin: 0; max-width: none; } body { background: #fff; } @page { size: A4 landscape; margin: 0; } }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--grid-2); padding: 40px 0; font-size: 14px; color: var(--muted); background: var(--paper); }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: center; }
.site-footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

.error-page { text-align: center; padding: 100px 16px; }
.error-page .code { font: 600 15px var(--font); color: var(--ledger); border: 1.5px solid var(--ledger); display: inline-block; padding: 3px 10px; border-radius: 5px; margin-bottom: 18px; }
.legal { max-width: 760px; padding: 48px 20px 80px; }
.legal h2 { font-size: 22px; margin-top: 1.6em; }

.toast-level { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); background: var(--ink); color: #fff; padding: 14px 20px; border-radius: 10px; box-shadow: var(--shadow); z-index: 70; display: flex; gap: 12px; align-items: center; animation: flashIn .3s; }
.toast-level b { font-family: var(--font); color: var(--marker); }

/* =====================================================================
 * v1.1: full-width modern layer
 * ===================================================================== */
:root { --wrap: none; --gutter: clamp(20px, 5vw, 88px); --ease: cubic-bezier(.2, .7, .2, 1); --deep: #06301B; }
.wrap { max-width: none; padding-left: var(--gutter); padding-right: var(--gutter); }

/* header becomes solid once you scroll */
.site-header { background: rgba(255, 255, 255, .72); border-bottom-color: transparent; transition: background .25s, border-color .25s, box-shadow .25s; }
.site-header.is-scrolled { background: rgba(255, 255, 255, .94); border-bottom-color: var(--grid-2); box-shadow: 0 6px 24px -18px rgba(6, 48, 27, .5); }
.btn { transition: background .15s, border-color .15s, color .15s, transform .15s var(--ease), box-shadow .2s; }
.btn:active { transform: translateY(1px) scale(.99); }
.btn-primary { box-shadow: 0 1px 0 rgba(255, 255, 255, .15) inset, 0 8px 20px -10px rgba(16, 124, 65, .7); }
.btn-primary:hover { box-shadow: 0 1px 0 rgba(255, 255, 255, .15) inset, 0 12px 26px -10px rgba(16, 124, 65, .8); transform: translateY(-1px); }

/* reveal on scroll */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); transition-delay: var(--d, 0s); }
[data-reveal].is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { [data-reveal] { opacity: 1; transform: none; } }
.no-js [data-reveal] { opacity: 1; transform: none; }

/* ---------- hero ---------- */
.x-hero { position: relative; overflow: hidden; padding: clamp(56px, 8vw, 120px) 0 clamp(48px, 6vw, 96px); background: radial-gradient(1200px 600px at 85% 10%, #E3F4EA 0, transparent 60%), radial-gradient(900px 500px at 0% 100%, #F1F8F4 0, transparent 60%), var(--paper); isolation: isolate; }
.x-hero .gridlines { position: absolute; inset: 0; z-index: -1; background-image: linear-gradient(var(--grid-2) 1px, transparent 1px), linear-gradient(90deg, var(--grid-2) 1px, transparent 1px); background-size: 104px 30px; -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, #000 30%, transparent 75%); mask-image: radial-gradient(ellipse 70% 70% at 50% 40%, #000 30%, transparent 75%); }
.x-hero .spot { position: absolute; inset: 0; z-index: -1; pointer-events: none; background-image: linear-gradient(rgba(16, 124, 65, .28) 1px, transparent 1px), linear-gradient(90deg, rgba(16, 124, 65, .28) 1px, transparent 1px); background-size: 104px 30px; -webkit-mask-image: radial-gradient(260px 260px at var(--mx, -999px) var(--my, -999px), #000, transparent 70%); mask-image: radial-gradient(260px 260px at var(--mx, -999px) var(--my, -999px), #000, transparent 70%); }
.x-hero .wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(32px, 5vw, 96px); align-items: center; }
.x-hero h1 { font-size: clamp(2.6rem, 5.6vw, 5.4rem); line-height: 1.02; letter-spacing: -0.045em; font-weight: 700; margin-bottom: 22px; max-width: 13ch; }
.x-hero h1 .g { color: var(--excel); }
.x-hero .lede { font-size: clamp(17px, 1.35vw, 21px); color: var(--ink-2); max-width: 48ch; margin-bottom: 30px; }
.eyebrow-chip { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px 6px 6px; border: 1px solid var(--grid); border-radius: 999px; background: rgba(255, 255, 255, .8); font-size: 14px; color: var(--ink-2); margin-bottom: 24px; text-decoration: none; }
.eyebrow-chip b { background: var(--excel); color: #fff; font-size: 12px; padding: 3px 8px; border-radius: 999px; font-weight: 600; }
.eyebrow-chip:hover { border-color: var(--excel); color: var(--ink); }
.hero-trust { display: flex; gap: 22px; flex-wrap: wrap; font-size: 14px; color: var(--muted); }
.hero-trust span { display: inline-flex; align-items: center; gap: 7px; }
.hero-trust svg { color: var(--excel); }
.stage { position: relative; perspective: 1400px; }
.stage .window { transform: rotateY(-7deg) rotateX(3deg); transform-style: preserve-3d; transition: transform .6s var(--ease), box-shadow .6s; box-shadow: 0 40px 80px -40px rgba(6, 48, 27, .45), 0 2px 8px rgba(6, 48, 27, .06); }
.stage:hover .window, .stage.is-live .window { transform: none; }
.stage .window { background: var(--paper); border: 1px solid var(--grid); border-radius: 14px; overflow: hidden; }
.chip-float { position: absolute; z-index: 3; font: 500 13px var(--font); background: var(--paper); border: 1px solid var(--grid); border-radius: 10px; padding: 9px 12px; box-shadow: 0 14px 30px -18px rgba(6, 48, 27, .5); white-space: nowrap; animation: bob 6s ease-in-out infinite; }
.chip-float i { font-style: normal; color: var(--excel); font-weight: 600; }
.chip-a { top: -18px; left: -26px; }
.chip-b { bottom: 54px; right: -22px; animation-delay: -3s; }
@keyframes bob { 50% { transform: translateY(-8px); } }
.stage.is-live .chip-float { opacity: 0; transform: scale(.9); transition: opacity .3s, transform .3s; animation: none; }
.try-bar { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-top: 1px solid var(--grid-2); background: linear-gradient(#FAFCFB, #F3F8F5); flex-wrap: wrap; }
.try-bar .msg { flex: 1; min-width: 200px; font-size: 14.5px; color: var(--ink-2); }
.try-bar .msg b { color: var(--ink); }
.try-bar .msg.good { color: var(--excel); font-weight: 500; }
.try-bar .msg.bad { color: var(--bad); }
@media (max-width: 1020px) { .x-hero .wrap { grid-template-columns: 1fr; } .stage .window { transform: none; } .chip-a { left: 8px; } .chip-b { right: 8px; } }

/* function ticker */
.ticker { border-top: 1px solid var(--grid-2); border-bottom: 1px solid var(--grid-2); background: var(--paper); overflow: hidden; padding: 16px 0; -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent); }
.ticker-track { display: flex; gap: 14px; width: max-content; animation: tick 60s linear infinite; }
.ticker:hover .ticker-track { animation-play-state: paused; }
.ticker span { font: 500 14px var(--font); color: var(--ink-2); padding: 7px 14px; border: 1px solid var(--grid); border-radius: 8px; background: var(--mist); }
.ticker span b { color: var(--excel); font-weight: 600; }
@keyframes tick { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .ticker-track { animation: none; } .chip-float { animation: none; } }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--grid); border-radius: 18px; background: var(--paper); overflow: hidden; }
.stats > div { padding: clamp(22px, 2.6vw, 38px); border-right: 1px solid var(--grid); }
.stats > div:last-child { border-right: 0; }
.stats b { display: block; font-size: clamp(2.2rem, 4vw, 3.6rem); font-weight: 700; letter-spacing: -0.04em; line-height: 1; color: var(--ink); margin-bottom: 8px; font-variant-numeric: tabular-nums; }
.stats b small { font-size: .5em; color: var(--excel); margin-left: 2px; }
.stats span { color: var(--muted); font-size: 15px; }
@media (max-width: 860px) { .stats { grid-template-columns: 1fr 1fr; } .stats > div:nth-child(2) { border-right: 0; } .stats > div:nth-child(-n+2) { border-bottom: 1px solid var(--grid); } }

/* section heads */
.x-section { padding: clamp(72px, 9vw, 140px) 0; }
.x-section.tint { background: linear-gradient(var(--mist), #F8FBF9); border-top: 1px solid var(--grid-2); border-bottom: 1px solid var(--grid-2); }
.x-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; margin-bottom: clamp(32px, 4vw, 56px); flex-wrap: wrap; }
.x-head h2 { font-size: clamp(2rem, 3.8vw, 3.4rem); letter-spacing: -0.04em; font-weight: 700; margin: 0; max-width: 18ch; line-height: 1.05; }
.x-head p { max-width: 46ch; font-size: 18px; color: var(--ink-2); margin: 0; }

/* steps */
.steps3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.step-card { position: relative; background: var(--paper); border: 1px solid var(--grid); border-radius: 18px; padding: 30px; overflow: hidden; transition: transform .3s var(--ease), box-shadow .3s, border-color .3s; }
.step-card:hover { transform: translateY(-4px); border-color: #B9D8C6; box-shadow: 0 24px 40px -28px rgba(6, 48, 27, .45); }
.step-card .ref { font: 600 14px var(--font); color: var(--excel); border: 1.5px solid var(--excel); padding: 3px 9px; border-radius: 6px; display: inline-block; margin-bottom: 22px; }
.step-card h3 { font-size: 22px; letter-spacing: -0.02em; }
.step-card p { color: var(--ink-2); margin: 0; }
.step-card .art { margin-top: 24px; font: 500 14px var(--font); background: var(--mist); border: 1px solid var(--grid-2); border-radius: 10px; padding: 12px 14px; color: var(--ink-2); }
.step-card .art .ok { color: var(--excel); font-weight: 600; }
@media (max-width: 900px) { .steps3 { grid-template-columns: 1fr; } }

/* spotlight hover for cards */
.spot-card { position: relative; }
.spot-card::before { content: ""; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; background: radial-gradient(420px circle at var(--cx, 50%) var(--cy, 50%), rgba(16, 124, 65, .09), transparent 45%); opacity: 0; transition: opacity .3s; }
.spot-card:hover::before { opacity: 1; }

/* lesson cards */
.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 24px; }
.filters button { font: 500 14.5px var(--font); color: var(--ink-2); background: var(--paper); border: 1px solid var(--grid); border-radius: 999px; padding: 8px 16px; cursor: pointer; transition: all .2s; }
.filters button:hover { border-color: var(--ink-2); }
.filters button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.filters button span { opacity: .6; margin-left: 4px; }
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 16px; }
.l-card { display: flex; flex-direction: column; gap: 10px; background: var(--paper); border: 1px solid var(--grid); border-radius: 16px; padding: 22px; text-decoration: none; color: var(--ink); transition: transform .25s var(--ease), box-shadow .25s, border-color .25s; min-height: 190px; }
.l-card:hover { transform: translateY(-3px); border-color: #B9D8C6; box-shadow: 0 20px 36px -26px rgba(6, 48, 27, .5); color: var(--ink); }
.l-card .top { display: flex; justify-content: space-between; align-items: center; }
.l-card .num { font: 600 13px var(--font); color: var(--muted); }
.l-card h3 { font-size: 18px; margin: 4px 0 0; letter-spacing: -0.015em; line-height: 1.25; }
.l-card p { font-size: 14.5px; color: var(--muted); margin: 0; flex: 1; }
.l-card .foot { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--muted); padding-top: 12px; border-top: 1px solid var(--grid-2); }
.l-card .go { color: var(--excel); font-weight: 600; transition: transform .2s; }
.l-card:hover .go { transform: translateX(3px); }
.l-card[hidden] { display: none; }
.l-card.is-done { border-color: #B9D8C6; background: linear-gradient(#F7FBF9, var(--paper)); }

/* bento */
.bento { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.tile { background: var(--paper); border: 1px solid var(--grid); border-radius: 18px; padding: clamp(22px, 2.4vw, 32px); overflow: hidden; transition: border-color .3s, box-shadow .3s; }
.tile:hover { border-color: #B9D8C6; box-shadow: 0 24px 40px -30px rgba(6, 48, 27, .45); }
.tile h3 { font-size: 21px; letter-spacing: -0.02em; margin-bottom: 8px; }
.tile p { color: var(--ink-2); margin: 0; }
.tile .ic { width: 42px; height: 42px; border-radius: 11px; background: var(--ledger-50); color: var(--excel); display: grid; place-items: center; margin-bottom: 18px; }
.t-4 { grid-column: span 4; } .t-2 { grid-column: span 2; } .t-3 { grid-column: span 3; }
.tile.dark { background: radial-gradient(500px 300px at 100% 0, rgba(16, 124, 65, .5), transparent 60%), var(--deep); color: #DDEDE3; border-color: var(--deep); }
.tile.dark h3 { color: #fff; } .tile.dark p { color: #B6CFC1; }
.kbd-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 20px; }
.kbd-row kbd { font-size: 14px; padding: 7px 11px; transition: transform .15s, background .15s; }
.kbd-row kbd.hit { transform: translateY(2px); background: var(--excel); color: #fff; border-color: var(--excel); }
.timer-art { margin-top: 20px; display: flex; align-items: center; gap: 14px; }
.timer-art .ring { width: 64px; height: 64px; }
.timer-art .ring circle { fill: none; stroke-width: 6; }
.timer-art b { font: 600 26px var(--font); }
@media (max-width: 1000px) { .t-4, .t-2, .t-3 { grid-column: span 6; } }

/* pricing section on home */
.x-pricing { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, 480px); gap: clamp(32px, 5vw, 96px); align-items: center; }
.x-pricing h2 { font-size: clamp(2rem, 3.8vw, 3.4rem); letter-spacing: -0.04em; font-weight: 700; line-height: 1.05; }
.plan-card { border-radius: 20px; padding: 28px; transition: box-shadow .3s; }
.plan-card:hover { box-shadow: 0 30px 60px -36px rgba(6, 48, 27, .55); }
.plan-opt { transition: border-color .15s, background .15s, transform .15s var(--ease); }
.plan-opt:hover { transform: translateY(-1px); }
@media (max-width: 960px) { .x-pricing { grid-template-columns: 1fr; } }

/* faq */
.faq-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: clamp(32px, 5vw, 96px); }
.faq { max-width: none; }
.faq details { padding: 22px 0; }
.faq details > *:not(summary) { animation: flashIn .3s var(--ease); }
@media (max-width: 900px) { .faq-grid { grid-template-columns: 1fr; } }

/* closing band */
.x-cta { position: relative; overflow: hidden; background: var(--deep); color: #DDEDE3; padding: clamp(72px, 9vw, 130px) 0; isolation: isolate; }
.x-cta::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: linear-gradient(rgba(255, 255, 255, .06) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .06) 1px, transparent 1px); background-size: 104px 30px; -webkit-mask-image: radial-gradient(ellipse at 70% 50%, #000, transparent 70%); mask-image: radial-gradient(ellipse at 70% 50%, #000, transparent 70%); }
.x-cta .wrap { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.x-cta h2 { color: #fff; font-size: clamp(2.2rem, 4.6vw, 4.2rem); letter-spacing: -0.045em; font-weight: 700; line-height: 1.02; max-width: 16ch; margin: 0 0 12px; }
.x-cta p { color: #A9C6B6; margin: 0; font-size: 18px; }
.x-cta .btn-marker { font-size: 18px; padding: 18px 30px; }

/* page heads on inner pages */
.page-head { position: relative; padding: clamp(48px, 6vw, 88px) 0 clamp(28px, 3vw, 44px); background: radial-gradient(900px 400px at 90% 0, #E3F4EA, transparent 60%), var(--mist); overflow: hidden; }
.page-head::after { content: ""; position: absolute; inset: 0; pointer-events: none; background-image: linear-gradient(var(--grid-2) 1px, transparent 1px), linear-gradient(90deg, var(--grid-2) 1px, transparent 1px); background-size: 104px 30px; -webkit-mask-image: linear-gradient(90deg, transparent 40%, #000); mask-image: linear-gradient(90deg, transparent 40%, #000); opacity: .7; }
.page-head > * { position: relative; z-index: 1; }
.page-head h1 { font-size: clamp(2.2rem, 4.4vw, 3.8rem); letter-spacing: -0.04em; font-weight: 700; }

/* legal */
.legal { max-width: 820px; margin: 0 auto; }
.legal-meta { color: var(--muted); font-size: 14px; margin-bottom: 28px; }
.legal h2 { font-size: 21px; letter-spacing: -0.01em; margin-top: 2em; }
.legal p, .legal li { color: var(--ink-2); }
.legal ul { padding-left: 1.2em; }
.legal li { margin-bottom: 6px; }
.site-footer { padding: 48px 0; }
.foot-legal { font-size: 13.5px; color: var(--muted); }

/* =====================================================================
 * v1.2: forest-green theme (gradient-lit dark sections, mint surfaces,
 * lime highlights, pill buttons). Open Sans throughout.
 * ===================================================================== */
:root {
  --forest: #062A1C; --forest-2: #0A3D28; --forest-3: #0E5534;
  --lime: #C4F168; --lime-2: #A9E04A; --mint: #EEF6F1; --mint-2: #E2F0E7;
  --wordmark: #6EE29C; --on-dark: #E6F3EB; --on-dark-2: #A9C9B6;
  --grad-dark: radial-gradient(1100px 620px at 82% -12%, rgba(46, 179, 104, .55) 0, transparent 62%), radial-gradient(800px 520px at -5% 110%, rgba(196, 241, 104, .16) 0, transparent 60%), linear-gradient(165deg, #062A1C 0%, #08331F 55%, #0B4A2B 100%);
  --r-card: 20px;
}
body { background: var(--mint); font-feature-settings: "kern"; }
h1, h2, h3 { letter-spacing: -0.025em; }

/* header: dark, sits on the gradient */
.site-header { background: rgba(6, 42, 28, .86); border-bottom: 1px solid rgba(255, 255, 255, .06); }
.site-header.is-scrolled { background: rgba(6, 42, 28, .96); border-bottom-color: rgba(255, 255, 255, .08); box-shadow: 0 10px 30px -20px rgba(0, 0, 0, .6); }
.logo, .logo:hover { color: var(--wordmark); font-weight: 800; }
.nav a { color: var(--on-dark-2); }
.nav a:hover, .nav a[aria-current] { color: #fff; background: rgba(255, 255, 255, .08); }
.cur-form select { background-color: rgba(255, 255, 255, .06); color: var(--on-dark); border-color: rgba(255, 255, 255, .16); background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%23A9C9B6' fill='none' stroke-width='1.5'/%3E%3C/svg%3E"); }
.cur-form select option { color: var(--ink); }
.site-header .btn-ghost { background: transparent; color: var(--on-dark); border-color: rgba(255, 255, 255, .22); }
.site-header .btn-ghost:hover { border-color: #fff; color: #fff; }
.site-header .btn-primary { background: var(--lime); color: var(--forest); box-shadow: none; }
.site-header .btn-primary:hover { background: #D3F78A; color: var(--forest); }
.user-chip { color: var(--on-dark); border-color: rgba(255, 255, 255, .2); }
.user-chip:hover { color: #fff; border-color: #fff; }
.menu-toggle { color: #fff; border-color: rgba(255, 255, 255, .25); }

/* buttons: pills */
.btn { border-radius: 999px; padding: 13px 22px; }
.btn-sm { padding: 8px 15px; border-radius: 999px; }
.btn-lg { padding: 16px 28px; }
.btn-lime { background: var(--lime); color: var(--forest); font-weight: 700; }
.btn-lime:hover { background: #D3F78A; color: var(--forest); transform: translateY(-1px); }
.btn-glass { background: rgba(255, 255, 255, .08); color: #fff; border: 1px solid rgba(255, 255, 255, .22); }
.btn-glass:hover { background: rgba(255, 255, 255, .14); color: #fff; }
.btn-ghost { background: #fff; }

/* pills */
.pill { border-radius: 999px; }
.pill-lime { background: var(--lime); color: var(--forest); font-weight: 700; }
.pill-glass { background: rgba(255, 255, 255, .1); color: var(--on-dark); border: 1px solid rgba(255, 255, 255, .16); text-decoration: none; font-weight: 600; }
a.pill-glass:hover { background: rgba(255, 255, 255, .18); color: #fff; }
.diff-pill.diff-easy, .pill-glass.diff-easy { background: #DDF5E6; color: #0B6B37; border-color: transparent; }
.diff-pill.diff-medium, .pill-glass.diff-medium { background: #FFF1CF; color: #8A5A00; border-color: transparent; }
.diff-pill.diff-hard, .pill-glass.diff-hard { background: #FFE0DB; color: #A2291A; border-color: transparent; }

/* flashes: tinted boxes, no edge bar */
.flash { border: 1px solid #CFE6D8; background: #F1FAF4; border-radius: 14px; }
.flash-error { border-color: #F5C9C3; background: #FFF4F2; }
.flash-info { border-color: #CFDCF5; background: #F3F7FF; }

/* hero: dark gradient with a white product window */
.x-hero { background: var(--grad-dark); color: var(--on-dark); padding-top: clamp(64px, 8vw, 128px); }
.x-hero .gridlines { background-image: linear-gradient(rgba(255, 255, 255, .055) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .055) 1px, transparent 1px); }
.x-hero .spot { background-image: linear-gradient(rgba(196, 241, 104, .5) 1px, transparent 1px), linear-gradient(90deg, rgba(196, 241, 104, .5) 1px, transparent 1px); }
.x-hero h1 { color: #fff; }
.x-hero .lede { color: var(--on-dark-2); }
.x-hero .btn-primary { background: var(--lime); color: var(--forest); box-shadow: 0 14px 30px -14px rgba(196, 241, 104, .7); }
.x-hero .btn-primary:hover { background: #D3F78A; color: var(--forest); }
.x-hero .btn-ghost { background: rgba(255, 255, 255, .06); color: #fff; border-color: rgba(255, 255, 255, .25); }
.x-hero .btn-ghost:hover { background: rgba(255, 255, 255, .12); color: #fff; border-color: #fff; }
.eyebrow-chip { background: rgba(255, 255, 255, .07); border-color: rgba(255, 255, 255, .16); color: var(--on-dark); }
.eyebrow-chip b { background: var(--lime); color: var(--forest); }
.eyebrow-chip:hover { border-color: var(--lime); color: #fff; }
.hero-trust { color: var(--on-dark-2); }
.hero-trust svg { color: var(--lime); }
.stage .window { border-radius: 20px; border-color: rgba(255, 255, 255, .5); box-shadow: 0 50px 100px -40px rgba(0, 0, 0, .7), 0 0 0 8px rgba(255, 255, 255, .05); }
.chip-float { border-radius: 14px; }

/* ticker on deep green */
.ticker { background: var(--forest); border-color: rgba(255, 255, 255, .06); }
.ticker span { background: rgba(255, 255, 255, .05); border-color: rgba(255, 255, 255, .1); color: var(--on-dark-2); border-radius: 999px; }
.ticker span b { color: var(--lime); }

/* stats band: dark card */
.stats { background: var(--grad-dark); border: 0; border-radius: 28px; }
.stats > div { border-color: rgba(255, 255, 255, .08) !important; }
.stats b { color: #fff; }
.stats b small { color: var(--lime); }
.stats span { color: var(--on-dark-2); }

/* sections: mint, not white */
.x-section { background: var(--mint); }
.x-section.tint { background: linear-gradient(180deg, #E4F2EA, var(--mint)); border-color: transparent; }
.x-head h2 { color: var(--forest); }
.step-card, .l-card, .tile, .quote, .plan-card, .panel, .lesson-text .note { border-radius: var(--r-card); }
.step-card, .l-card, .tile, .quote, .plan-card { border-color: #D6E7DC; box-shadow: 0 1px 0 rgba(6, 42, 28, .03), 0 14px 32px -28px rgba(6, 42, 28, .5); }
.step-card .ref { border-radius: 999px; padding: 4px 12px; }
.step-card .art { border-radius: 12px; background: var(--mint); }
.tile.dark { background: var(--grad-dark); }
.filters button { border-color: #D2E4D8; }
.filters button[aria-pressed="true"] { background: var(--forest); border-color: var(--forest); }
.l-card .num { font-weight: 700; }
.l-card .go { color: var(--excel); }
.plan-opt { border-radius: 16px; }
.plan-opt:has(input:checked) { border-color: var(--excel); background: #F1FAF4; }
.plan-opt .tag { background: var(--lime); }
.faq details { border-color: #D6E7DC; }
.x-cta { background: var(--grad-dark); }
.x-cta .btn-marker { background: var(--lime); color: var(--forest); border-radius: 999px; }
.x-cta .btn-marker:hover { background: #D3F78A; }

/* inner page heads: same dark gradient */
.page-head, .ch-hero { background: var(--grad-dark); color: var(--on-dark); border: 0; }
.page-head::after { background-image: linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px); }
.page-head h1, .ch-hero h1 { color: #fff; }
.page-head p { color: var(--on-dark-2); }
.page-head a { color: var(--lime); }
.page-head .meter { background: rgba(255, 255, 255, .15); }
.page-head .meter > span { background: var(--lime); }
.page-head .lvl .badge { background: var(--lime); color: var(--forest); }
.page-head .small.muted { color: var(--on-dark-2); }

/* footer: dark */
.site-footer { background: var(--forest); color: var(--on-dark-2); border-top: 0; }
.site-footer a { color: var(--on-dark-2); }
.site-footer a:hover { color: #fff; }

/* legal page as a card */
.legal { background: #fff; border: 1px solid #D6E7DC; border-radius: var(--r-card); padding: clamp(24px, 4vw, 56px); }

/* lesson page */
.lesson-layout { background: var(--mint); }
.lesson-nav { background: #E3F0E8; border-right-color: #D2E4D8; }
.lesson-nav a { margin: 1px 10px; border-radius: 10px; padding: 7px 10px; }
.lesson-nav a:hover { background: rgba(255, 255, 255, .6); }
.lesson-nav a[aria-current] { background: #fff; color: var(--excel); box-shadow: 0 6px 16px -12px rgba(6, 42, 28, .5); }
.lesson-nav h4 { margin-left: 20px; }
.practice { border-radius: var(--r-card); border-color: #D6E7DC; }
.practice-head { background: #F3F9F5; }
.tasks { background: #FAFDFB; }
.task.is-current { box-shadow: 0 0 0 1.5px var(--excel), 0 6px 18px -10px rgba(6, 42, 28, .35); }
.task.is-current .n { background: var(--excel); border-color: var(--excel); color: #fff; }
.lesson-text .note { background: #F4FBE6; border-color: #DCEFB4; }
.xp-chip { border-radius: 999px; }
.timer { border-radius: 999px; background: var(--forest); }

/* auth & account surfaces */
.auth-wrap { background: var(--grad-dark); }
.auth-card { border-radius: 24px; border: 0; box-shadow: 0 40px 80px -40px rgba(0, 0, 0, .6); }
.panel { border-color: #D6E7DC; }
.stat-row { border-radius: var(--r-card); border-color: #D6E7DC; background: #D6E7DC; }
.summary-card { background: #fff; border-radius: var(--r-card); border-color: #D6E7DC; }
.gw-opt { border-radius: 16px; }
.certificate { border-radius: 6px; }
.toast-level { background: var(--forest); border-radius: 999px; }
.toast-level b { color: var(--lime); }

/* ---------- challenges ---------- */
.ch-hero { position: relative; overflow: hidden; padding: clamp(40px, 5vw, 72px) 0 clamp(32px, 4vw, 56px); }
.ch-hero h1 { font-size: clamp(2rem, 4.2vw, 3.6rem); font-weight: 800; letter-spacing: -0.035em; margin: 16px 0 10px; max-width: 24ch; }
.ch-meta { display: flex; gap: 8px; flex-wrap: wrap; }
.ch-meta .pill { padding: 5px 12px; font-size: 13px; }
.ch-lede { color: var(--on-dark-2); font-size: 18px; max-width: 58ch; margin: 0 0 8px; }
.ch-note { color: var(--on-dark-2); font-size: 14.5px; margin-top: 12px; }
.ch-stats { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.ch-stats > div { background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .12); border-radius: 16px; padding: 12px 18px; min-width: 170px; }
.ch-stats span { display: block; font-size: 13px; color: var(--on-dark-2); }
.ch-stats b { font-size: 22px; color: #fff; font-variant-numeric: tabular-nums; }
.ch-body { padding-top: 32px; padding-bottom: 96px; }
.ch-grid { display: grid; grid-template-columns: minmax(280px, 380px) minmax(0, 1fr); gap: 24px; align-items: start; }
.ch-side { background: #fff; border: 1px solid #D6E7DC; border-radius: var(--r-card); padding: 24px; display: grid; gap: 14px; position: sticky; top: 88px; }
.ch-prompt { font-size: 16.5px; color: var(--ink-2); }
.ch-prompt p:last-child { margin-bottom: 0; color: var(--ink); }
.ch-sheet .xs-wrap { max-height: 560px; }
.ch-result { background: linear-gradient(160deg, #EAF8EF, #fff); border: 1px solid #CFE6D8; border-radius: 16px; padding: 18px; }
.ch-result h3 { margin-bottom: 6px; }
.ch-result .row-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
@media (max-width: 980px) { .ch-grid { grid-template-columns: 1fr; } .ch-side { position: static; } }
.ch-hero-split { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(320px, 520px); gap: clamp(28px, 4vw, 72px); align-items: center; }
@media (max-width: 980px) { .ch-hero-split { grid-template-columns: 1fr; } }
.today-card { display: block; text-decoration: none; color: var(--ink); background: #fff; border-radius: 24px; padding: 28px; box-shadow: 0 40px 80px -40px rgba(0, 0, 0, .6); transition: transform .3s var(--ease); }
.today-card:hover { transform: translateY(-3px); color: var(--ink); }
.today-card h2 { font-size: clamp(1.4rem, 2.2vw, 1.9rem); margin: 14px 0 10px; color: var(--forest); }
.today-meta { display: flex; gap: 14px; flex-wrap: wrap; color: var(--muted); font-size: 14.5px; }
.today-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 22px; padding-top: 18px; border-top: 1px solid #E3EEE7; font-size: 14.5px; color: var(--muted); }
.today-foot b { color: var(--ink); font-variant-numeric: tabular-nums; }
.wall-card { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; background: var(--grad-dark); color: var(--on-dark); border-radius: 28px; padding: clamp(28px, 4vw, 56px); }
.wall-card h2 { color: #fff; font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800; }
.wall-card p { color: var(--on-dark-2); font-size: 17px; }
.wall-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.wall-list li { background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .1); border-radius: 16px; padding: 14px 16px; }
.wall-list b { display: block; color: #fff; }
.wall-list span { color: var(--on-dark-2); font-size: 14.5px; }
@media (max-width: 860px) { .wall-card { grid-template-columns: 1fr; } }

/* daily band on home */
.daily-band { background: var(--grad-dark); color: var(--on-dark); border-radius: 28px; padding: clamp(28px, 4vw, 56px); display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 460px); gap: clamp(24px, 4vw, 64px); align-items: center; position: relative; overflow: hidden; }
.daily-band h2 { color: #fff; font-size: clamp(2rem, 3.6vw, 3.2rem); font-weight: 800; letter-spacing: -0.035em; line-height: 1.05; margin: 14px 0 12px; }
.daily-band p { color: var(--on-dark-2); font-size: 17px; }
.daily-band .count { display: flex; gap: 10px; margin-top: 18px; }
.daily-band .count div { background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .12); border-radius: 14px; padding: 10px 14px; text-align: center; min-width: 74px; }
.daily-band .count b { display: block; font-size: 26px; color: #fff; font-variant-numeric: tabular-nums; }
.daily-band .count span { font-size: 12px; color: var(--on-dark-2); }
@media (max-width: 960px) { .daily-band { grid-template-columns: 1fr; } }

/* leaderboard */
.seg-tabs { display: inline-flex; gap: 4px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .12); border-radius: 999px; padding: 4px; margin-top: 18px; }
.seg-tabs a { color: var(--on-dark-2); text-decoration: none; padding: 7px 16px; border-radius: 999px; font-weight: 600; font-size: 14.5px; }
.seg-tabs a[aria-current] { background: var(--lime); color: var(--forest); }
.lb-locked { max-width: 640px; margin: 0 auto; text-align: center; background: #fff; border: 1px solid #D6E7DC; border-radius: 24px; padding: clamp(28px, 4vw, 52px); }
.lb-locked h2 { color: var(--forest); }
.lb-meter { width: 100%; height: 12px; margin-top: 20px; }
.podium { display: flex; justify-content: center; align-items: flex-end; gap: 14px; margin: 8px auto 28px; max-width: 760px; }
.podium-col { flex: 1; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.podium-col b { font-size: 16px; }
.podium-col span { color: var(--muted); font-size: 14px; }
.podium-col .block { width: 100%; margin-top: 10px; border-radius: 18px 18px 6px 6px; background: var(--grad-dark); color: #fff; font-weight: 800; font-size: 22px; display: grid; place-items: center; }
.podium-col.p1 .block { height: 140px; background: linear-gradient(160deg, #B8E95A, #8FCB2E); color: var(--forest); }
.podium-col.p2 .block { height: 104px; }
.podium-col.p3 .block { height: 80px; }
.avatar-lg { width: 56px; height: 56px; border-radius: 50%; background: var(--excel); color: #fff; display: grid; place-items: center; font-size: 22px; font-weight: 800; box-shadow: 0 0 0 4px #fff, 0 10px 20px -10px rgba(6, 42, 28, .6); margin-bottom: 6px; }
.p1 .avatar-lg { background: var(--forest); box-shadow: 0 0 0 4px var(--lime), 0 10px 20px -10px rgba(6, 42, 28, .6); }
.lb-table { max-width: 900px; margin: 0 auto; background: #fff; border: 1px solid #D6E7DC; border-radius: var(--r-card); overflow: hidden; }
.lb-row { display: grid; grid-template-columns: 70px minmax(0, 1.6fr) 1fr 90px 80px 100px; gap: 10px; align-items: center; padding: 12px 20px; border-bottom: 1px solid #EAF2ED; font-size: 15px; }
.lb-row:last-child { border-bottom: 0; }
.lb-head { font-size: 12.5px; font-weight: 700; color: var(--muted); background: #F6FAF8; }
.lb-row .rk { font-weight: 800; color: var(--forest); }
.lb-row .nm { display: flex; align-items: center; gap: 10px; font-weight: 600; min-width: 0; }
.lb-row .pt { font-weight: 800; text-align: right; }
.lb-head span:last-child { text-align: right; }
.lb-row.is-me { background: #F2FBE3; }
@media (max-width: 700px) { .lb-row { grid-template-columns: 50px minmax(0, 1fr) 80px; } .lb-row > :nth-child(3), .lb-row > :nth-child(4), .lb-row > :nth-child(5) { display: none; } }
.lb-mini { background: #fff; border: 1px solid #D6E7DC; border-radius: var(--r-card); overflow: hidden; }
.lb-mini .lb-row { grid-template-columns: 50px minmax(0, 1fr) 100px; }
/* v1.2 fixes */
.x-hero h1 { max-width: 15ch; font-size: clamp(2.6rem, 5.2vw, 5rem); }
.chip-float { color: var(--ink); }
.x-head h2 { max-width: 22ch; }
.daily-band .today-card h2 { color: var(--forest); font-size: clamp(1.3rem, 2vw, 1.75rem); letter-spacing: -0.02em; margin: 14px 0 10px; }

/* v1.3: header floats over the banner, solid once scrolled; solid ticker; two-tone wordmark */
:root { --hdr: 64px; }
html { scroll-padding-top: calc(var(--hdr) + 16px); }
.site-header { position: fixed; top: 0; left: 0; right: 0; }
#main { padding-top: var(--hdr); }
body.has-banner #main { padding-top: 0; }
body.has-banner .site-header:not(.is-scrolled):not(.open) { background: transparent; border-bottom-color: transparent; box-shadow: none; -webkit-backdrop-filter: none; backdrop-filter: none; }
.site-header.open { background: var(--forest); }
body.has-banner .x-hero { padding-top: calc(var(--hdr) + clamp(48px, 7vw, 112px)); }
body.has-banner .page-head { padding-top: calc(var(--hdr) + clamp(40px, 5vw, 80px)); }
body.has-banner .ch-hero { padding-top: calc(var(--hdr) + clamp(32px, 4vw, 64px)); }
body.has-banner .auth-wrap { padding-top: calc(var(--hdr) + 48px); min-height: 100vh; }
.lesson-nav { top: var(--hdr); height: calc(100vh - var(--hdr)); }
.ch-side { top: calc(var(--hdr) + 24px); }
.summary-card { top: calc(var(--hdr) + 24px); }
.flashes { top: calc(var(--hdr) + 12px); }

.ticker { -webkit-mask-image: none; mask-image: none; background: var(--forest); }

.logo .wm-a { color: var(--wordmark); }
.logo .wm-b { color: #fff; }
.logo svg { width: 30px; height: 30px; }

/* v1.4: headings: 2 lines max, balanced, no orphans */
h1, h2, h3, h4, .x-head h2, .l-card h3 { text-wrap: balance; }
p, li, .lede, .ch-lede, dd, figcaption, .hero-trust span { text-wrap: pretty; }
@media (min-width: 1021px) { .x-hero .wrap { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); } }
.x-hero h1 { max-width: 21ch; font-size: clamp(2rem, 4.1vw, 4rem); line-height: 1.05; }
.x-head h2 { max-width: 26ch; font-size: clamp(1.75rem, 3.1vw, 3rem); }
.x-cta h2 { max-width: 24ch; font-size: clamp(1.9rem, 3.6vw, 3.4rem); }
.x-pricing h2 { font-size: clamp(1.75rem, 3.1vw, 3rem); }
.daily-band h2 { font-size: clamp(1.75rem, 3vw, 2.8rem); }
.ch-hero h1 { max-width: 34ch; font-size: clamp(1.75rem, 3vw, 2.9rem); line-height: 1.1; }
.page-head h1 { font-size: clamp(1.9rem, 3.6vw, 3.2rem); }
.lesson-main h1 { font-size: clamp(1.6rem, 2.6vw, 2.2rem); max-width: 34ch; }
.wall-card h2, .lb-locked h2 { font-size: clamp(1.4rem, 2.4vw, 2.1rem); }
.today-card h2, .daily-band .today-card h2 { font-size: clamp(1.2rem, 1.8vw, 1.6rem); }
.l-card h3 { font-size: 17px; }
@media (max-width: 600px) {
  .x-hero h1 { font-size: 2rem; }
  .x-head h2, .x-pricing h2, .x-cta h2, .daily-band h2 { font-size: 1.6rem; }
  .ch-hero h1, .page-head h1 { font-size: 1.6rem; }
  .lesson-main h1 { font-size: 1.45rem; }
}
@media (max-width: 600px) { .x-hero h1 { font-size: 2.1rem; max-width: none; } }

/* v1.5: read-only course overview, sequential sidebar */
.course-bar { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.course-bar .filters { margin: 0; }
.l-card { cursor: default; min-height: 170px; }
.l-card:hover { transform: none; }
.l-card .step-no { color: var(--muted); }
.l-card.is-next { border-color: var(--excel); box-shadow: 0 0 0 3px rgba(196, 241, 104, .55), 0 18px 34px -24px rgba(6, 42, 28, .6); }
.l-card.is-done .pill { background: var(--ledger-50); color: var(--excel); }
.lesson-nav .nav-later { display: grid; grid-template-columns: 20px 1fr; gap: 10px; align-items: start; padding: 7px 10px; margin: 1px 10px; font-size: 14.5px; line-height: 1.35; color: #8FA89A; cursor: default; }
.lesson-nav .nav-later .ico { color: #B8CABF; }

/* ===================================================================== v1.6: narrator + certificate */
.narrator { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; max-width: 72ch; margin: 0 0 26px; padding: 10px 12px; background: var(--mint); border: 1px solid #D3E8DB; border-radius: 999px; }
.narrator[hidden] { display: none; }
.narrator .narr-play { gap: 8px; }
.narrator .narr-play svg { flex: none; }
.narr-stop { width: 32px; height: 32px; border-radius: 50%; border: 1px solid #C5DCCD; background: #fff; color: var(--forest); display: grid; place-items: center; cursor: pointer; }
.narr-stop:hover { border-color: var(--excel); color: var(--excel); }
.narr-track { flex: 1 1 120px; min-width: 80px; height: 6px; border-radius: 6px; background: #D3E8DB; overflow: hidden; }
.narr-track span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--excel), #3FBF78); border-radius: 6px; transition: width .4s ease; }
.narr-status { color: var(--muted); min-width: 0; white-space: nowrap; }
.narr-opt select { border: 1px solid #C5DCCD; background: #fff; border-radius: 999px; padding: 5px 10px; font: 600 13px var(--font); color: var(--forest); max-width: 190px; }
.lesson-text .is-reading { background: linear-gradient(90deg, rgba(196, 241, 104, .38), rgba(196, 241, 104, .12)); box-shadow: -10px 0 0 rgba(196, 241, 104, .38); border-radius: 6px; transition: background .25s; }
.lesson-main h1.is-reading { background: none; box-shadow: none; color: var(--excel); }
@media (max-width: 640px) { .narrator { border-radius: 18px; } .narr-status { order: 5; width: 100%; } }

.cert-stage { max-width: 1040px; margin: 40px auto 28px; container-type: inline-size; }
@media print {
  body.page-cert { background: #fff !important; }
  .page-cert #main { padding: 0 !important; }
  .page-cert #main > .wrap { padding: 0 !important; margin: 0 !important; max-width: none !important; width: 297mm; }
  .page-cert .cert-stage { width: 297mm; height: 209mm; margin: 0; max-width: none; overflow: hidden; page-break-after: avoid; break-after: avoid; }
  .page-cert .pcert { height: 209mm; aspect-ratio: auto; border-radius: 0; box-shadow: none; }
  .page-cert .verify-result { display: none !important; }
}
.lesson-body > .narrator { margin: 0 0 -8px; }

/* ===================================================================== v1.7: premium certificate + verification */
.pcert { --gold: #C9A24A; --gold-hi: #F3DE9A; --gold-lo: #8C6420; position: relative; aspect-ratio: 1.414; overflow: hidden; border-radius: .8cqw; background: radial-gradient(120% 90% at 50% 0, #0F5236, #062A1C 60%, #041C13); box-shadow: 0 50px 90px -50px rgba(4, 28, 19, .85), 0 0 0 1px rgba(201, 162, 74, .35); color: #13221B; font-family: var(--font); -webkit-print-color-adjust: exact; print-color-adjust: exact; }
.pc-guilloche { position: absolute; inset: 0; width: 100%; height: 100%; }
.pc-paper { position: absolute; inset: 2.7cqw; display: flex; flex-direction: column; align-items: center; text-align: center; padding: 4cqw 7cqw 3.2cqw; overflow: hidden;
  background: radial-gradient(80% 60% at 50% 40%, #FFFDF7, #FBF6EA 70%, #F4EBD5); box-shadow: 0 0 0 .22cqw var(--gold), 0 0 0 .5cqw #062A1C, 0 0 0 .62cqw rgba(201, 162, 74, .7), inset 0 0 6cqw rgba(140, 100, 32, .14); }
.pc-paper::before { content: ""; position: absolute; inset: 1.3cqw; border: .12cqw solid rgba(201, 162, 74, .85); pointer-events: none; }
.pc-paper::after { content: ""; position: absolute; inset: 1.65cqw; border: .06cqw solid rgba(6, 42, 28, .45); pointer-events: none; }
.pc-paper > * { position: relative; z-index: 1; }
.pc-rosette { position: absolute !important; z-index: 0 !important; left: 50%; top: 52%; width: 50cqw; height: 50cqw; transform: translate(-50%, -50%); opacity: .2; pointer-events: none; }
.pc-corner { position: absolute !important; width: 5.2cqw; height: 5.2cqw; border: .22cqw solid var(--gold); pointer-events: none; }
.pc-corner::after { content: ""; position: absolute; width: 1cqw; height: 1cqw; background: var(--gold); transform: rotate(45deg); }
.pc-corner.tl { left: 2.3cqw; top: 2.3cqw; border-right: 0; border-bottom: 0; } .pc-corner.tl::after { left: .8cqw; top: .8cqw; }
.pc-corner.tr { right: 2.3cqw; top: 2.3cqw; border-left: 0; border-bottom: 0; } .pc-corner.tr::after { right: .8cqw; top: .8cqw; }
.pc-corner.bl { left: 2.3cqw; bottom: 2.3cqw; border-right: 0; border-top: 0; } .pc-corner.bl::after { left: .8cqw; bottom: .8cqw; }
.pc-corner.br { right: 2.3cqw; bottom: 2.3cqw; border-left: 0; border-top: 0; } .pc-corner.br::after { right: .8cqw; bottom: .8cqw; }
.pcert .pc-logo { font-size: 1.75cqw; gap: .7cqw; }
.pcert .pc-logo svg { width: 2.5cqw; height: 2.5cqw; }
.pcert .pc-logo .wm-a { color: var(--excel); } .pcert .pc-logo .wm-b { color: #062A1C; }
.pc-title { margin: 1.5cqw 0 0; font: 300 6.2cqw/1 var(--font); letter-spacing: .32em; margin-right: -.32em; text-transform: uppercase; color: #062A1C; }
.pc-sub { display: flex; align-items: center; gap: 1.4cqw; margin-top: 1cqw; font: 700 1.3cqw var(--font); letter-spacing: .5em; text-transform: uppercase; color: var(--gold-lo); }
.pc-sub::before, .pc-sub::after { content: ""; width: 6cqw; height: .14cqw; background: linear-gradient(90deg, transparent, var(--gold)); }
.pc-sub::after { transform: scaleX(-1); }
.pc-sub span { margin-right: -.5em; }
.pc-presented { margin: 3cqw 0 0; font: italic 400 1.6cqw var(--font); color: #5B6B61; }
.pc-name { margin-top: 1cqw; max-width: 100%; font: italic 600 5.4cqw/1.12 var(--font); letter-spacing: -.01em; color: #062A1C; overflow-wrap: anywhere; }
.pc-name.is-long { font-size: 4.4cqw; } .pc-name.is-xlong { font-size: 3.5cqw; }
.pc-rule { display: flex; align-items: center; gap: .9cqw; width: 46cqw; margin: 1.1cqw 0 0; }
.pc-rule i { flex: 1; height: .16cqw; background: linear-gradient(90deg, transparent, var(--gold) 30%, var(--gold-lo)); }
.pc-rule i:last-child { transform: scaleX(-1); }
.pc-rule b { width: .95cqw; height: .95cqw; transform: rotate(45deg); background: linear-gradient(135deg, var(--gold-hi), var(--gold) 50%, var(--gold-lo)); }
.pc-text { margin: 1.8cqw 0 0; max-width: 60cqw; font: 400 1.55cqw/1.6 var(--font); color: #34473D; }
.pc-foot { margin-top: auto; width: 100%; display: grid; grid-template-columns: 1fr 15cqw 1fr; align-items: end; gap: 3cqw; }
.pc-fields { display: grid; gap: 1.6cqw; justify-items: start; text-align: left; }
.pc-fields > div { min-width: 22cqw; }
.pc-fields b { display: block; font: 700 1.5cqw var(--font); color: #062A1C; padding-bottom: .55cqw; border-bottom: .12cqw solid var(--gold); white-space: nowrap; }
.pc-fields b.mono { font-family: var(--mono); letter-spacing: .06em; }
.pc-fields span { display: block; margin-top: .45cqw; font: 700 .95cqw var(--font); letter-spacing: .2em; text-transform: uppercase; color: #6B7A70; }
.pc-seal-wrap { display: flex; justify-content: center; }
.pc-seal { width: 15cqw; height: auto; margin-bottom: -1.6cqw; filter: drop-shadow(0 .8cqw 1.2cqw rgba(60, 40, 5, .35)); }
.pc-qr { justify-self: end; display: flex; align-items: center; gap: 1.2cqw; text-align: left; }
.pc-qr-img { width: 9.6cqw; height: 9.6cqw; padding: .7cqw; background: #fff; border: .12cqw solid var(--gold); border-radius: .4cqw; box-shadow: 0 .4cqw 1cqw -0.5cqw rgba(60, 40, 5, .35); }
.pc-qr-img svg { display: block; width: 100%; height: 100%; }
.pc-qr-txt b { display: block; font: 700 1.25cqw var(--font); color: #062A1C; }
.pc-qr-txt span { display: block; margin-top: .3cqw; font: 600 1.02cqw var(--font); color: #6B7A70; max-width: 13cqw; overflow-wrap: anywhere; }

.verify-result { max-width: 1040px; margin: 36px auto 0; display: flex; align-items: center; gap: 16px; padding: 16px 20px; background: #fff; border: 1px solid #CDE6D6; border-radius: 16px; box-shadow: 0 16px 30px -24px rgba(6, 42, 28, .5); }
.vr-badge { width: 46px; height: 46px; flex: none; border-radius: 50%; background: var(--mint); display: grid; place-items: center; }
.vr-main { flex: 1; min-width: 0; }
.vr-main > b { display: block; font-size: 17px; color: var(--excel); }
.vr-main > span { color: var(--ink-2); font-size: 15px; }
@media (max-width: 640px) { .verify-result { flex-wrap: wrap; } .verify-result .btn { width: 100%; } }

.verify-box { max-width: 680px; margin: -64px auto 0; position: relative; z-index: 2; background: #fff; border-radius: 22px; padding: 28px; box-shadow: 0 30px 60px -36px rgba(6, 42, 28, .55); border: 1px solid #DCEBE2; }
.verify-form { display: flex; gap: 10px; }
.verify-form input { flex: 1; min-width: 0; height: 54px; border: 1.5px solid #C5DCCD; border-radius: 999px; padding: 0 22px; font: 600 18px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--forest); background: #FBFDFC; }
.verify-form input::placeholder { color: #A9BCB1; letter-spacing: .06em; }
.verify-form input:focus { outline: none; border-color: var(--excel); box-shadow: 0 0 0 4px rgba(16, 124, 65, .14); }
.verify-form .btn { height: 54px; padding: 0 26px; }
.verify-err { margin: 14px 0 0; padding: 12px 16px; border-radius: 12px; background: #FEF3F2; color: #B42318; font-size: 15px; }
.verify-tips { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.verify-tips div { padding: 16px; border-radius: 14px; background: var(--mint); font-size: 14.5px; color: var(--ink-2); }
.verify-tips b { display: block; color: var(--forest); margin-bottom: 4px; font-size: 15px; }
@media (max-width: 640px) { .verify-form { flex-direction: column; } .verify-tips { grid-template-columns: 1fr; } .verify-box { padding: 20px; } }
.pc-text { max-width: 64cqw; text-wrap: balance; }
.pc-seal { width: 13.5cqw; margin-bottom: .2cqw; }
.pc-foot { grid-template-columns: 1fr 13.5cqw 1fr; }
.verify-box { margin: 44px 0 72px; max-width: 760px; }
.vg-load { margin-top: 14px; display: grid; gap: 6px; }
.vg-bar { height: 8px; border-radius: 8px; background: #E3EFE7; overflow: hidden; }
.vg-bar span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--excel), #3FBF78); transition: width .3s; }

/* ===================================================================== v1.8: lesson reading column + "at a glance" panel */
.lesson-read { display: grid; grid-template-columns: minmax(0, 1fr); gap: 40px; align-items: start; }
.lesson-read-main { min-width: 0; }
.lesson-read-main > .narrator { margin-bottom: 20px; }
.lesson-glance { display: none; }
@media (min-width: 1200px) {
  .lesson-read { grid-template-columns: minmax(0, 1fr) clamp(300px, 26vw, 380px); }
  .lesson-read-main .lesson-text, .lesson-read-main > .narrator { max-width: 820px; }
  .lesson-glance { display: block; position: sticky; top: calc(var(--hdr) + 24px); background: #fff; border: 1px solid #D7E7DD; border-radius: 22px; padding: 22px 22px 20px; box-shadow: 0 24px 48px -36px rgba(6, 42, 28, .45); }
}
.lesson-glance h3 { margin: 20px 0 8px; font-size: 12px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: #6B8577; }
.lesson-glance p { margin: 0; font-size: 15px; color: var(--ink-2); line-height: 1.55; }
.lg-top { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.lg-eyebrow { font-weight: 700; color: var(--forest); font-size: 15px; }
.lg-pct { font-size: 13px; color: var(--muted); }
.lg-meter { height: 6px; border-radius: 6px; background: #E3EFE7; margin-top: 10px; overflow: hidden; }
.lg-meter span { display: block; height: 100%; background: linear-gradient(90deg, var(--excel), #3FBF78); border-radius: 6px; }
.lg-fx { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.lg-fx code { display: block; padding: 8px 12px; border-radius: 10px; background: #0F1F18; color: #D7F5E2; font: 500 13.5px var(--mono); overflow-x: auto; white-space: nowrap; }
.lg-keys { display: flex; flex-wrap: wrap; gap: 6px; }
.lg-keys kbd { font: 600 12.5px var(--font); padding: 3px 8px; border: 1px solid #C9D9CF; border-bottom-width: 2px; border-radius: 6px; background: #F7FBF8; color: var(--forest); }
.lg-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 12px; }
.lg-stats div { background: var(--mint); border-radius: 12px; padding: 10px 8px; text-align: center; }
.lg-stats b { display: block; font-size: 20px; color: var(--forest); line-height: 1.1; }
.lg-stats span { font-size: 12px; color: var(--muted); }
.lg-next { margin-top: 18px; padding-top: 16px; border-top: 1px solid #E3EFE7; display: grid; gap: 2px; }
.lg-next span { font-size: 12px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: #6B8577; }
.lg-next b { color: var(--forest); font-size: 15.5px; }
.lg-next small { color: var(--muted); font-size: 13px; }
@media (min-width: 1200px) {
  .lesson-read { grid-template-columns: minmax(0, 1fr) clamp(320px, 24vw, 420px); gap: 48px; }
  .lesson-read-main .lesson-text, .lesson-read-main > .narrator { max-width: none; }
}
@media (min-width: 1600px) { .lesson-read-main .lesson-text { font-size: 18px; } }
@media (min-width: 1200px) { .lesson-glance { max-height: calc(100vh - var(--hdr) - 48px); overflow-y: auto; } }

/* ===================================================================== v1.9: single one-time price */
.plan-card.is-single .one-price { display: flex; align-items: center; gap: 14px; margin: 18px 0 14px; }
.one-price .amt { font: 800 clamp(2.6rem, 5vw, 3.4rem)/1 var(--font); letter-spacing: -.03em; color: var(--forest); }
.one-price .per { font-size: 14px; line-height: 1.35; color: var(--muted); padding-left: 14px; border-left: 2px solid var(--lime); }
.one-incl { list-style: none; margin: 0 0 20px; padding: 0; display: grid; gap: 8px; }
.one-incl li { position: relative; padding-left: 28px; color: var(--ink-2); font-size: 15px; }
.one-incl li::before { content: ""; position: absolute; left: 0; top: 2px; width: 18px; height: 18px; border-radius: 50%; background: var(--mint) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none' stroke='%23107C41' stroke-width='3'%3E%3Cpath d='M5 10.5l3.2 3.2L15 7'/%3E%3C/svg%3E") center/12px no-repeat; }
.nm-txt { display: inline-flex; flex-direction: column; min-width: 0; line-height: 1.25; }
.lb-job { display: block; font-size: 12.5px; font-weight: 500; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 260px; }
.podium-col .lb-job { margin: -2px auto 4px; max-width: 160px; text-align: center; }

/* ===================================================================== v1.10: verify by ID or upload */
.verify-box.verify-two { max-width: 1040px; display: grid; grid-template-columns: 1fr auto 1fr; gap: 28px; align-items: stretch; padding: 30px; }
.vb-col h2 { font-size: 19px; margin: 0 0 4px; }
.vb-col > p { margin: 0 0 16px; }
.vb-or { display: flex; flex-direction: column; align-items: center; gap: 10px; color: var(--muted); font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: .1em; }
.vb-or::before, .vb-or::after { content: ""; flex: 1; width: 1px; background: #DCEBE2; }
.dropzone { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; min-height: 150px; padding: 20px; text-align: center; border: 2px dashed #B9D6C4; border-radius: 18px; background: #F7FBF8; color: var(--excel); cursor: pointer; transition: border-color .15s, background .15s; }
.dropzone:hover, .dropzone.is-over { border-color: var(--excel); background: var(--mint); }
.dropzone:focus-within { outline: 3px solid rgba(16, 124, 65, .25); outline-offset: 2px; }
.dropzone b { color: var(--forest); font-size: 16px; }
.dropzone u { color: var(--excel); }
.dropzone.is-busy { pointer-events: none; border-style: solid; background: linear-gradient(90deg, #F7FBF8, #E8F4EC, #F7FBF8); background-size: 200% 100%; animation: dzbusy 1.2s linear infinite; }
@keyframes dzbusy { to { background-position: -200% 0; } }
.verify-wide { max-width: 1040px; margin: -48px 0 72px; }
.verify-wide .verify-tips { margin-top: 18px; }
@media (max-width: 860px) {
  .verify-box.verify-two { grid-template-columns: 1fr; padding: 22px; }
  .vb-or { flex-direction: row; } .vb-or::before, .vb-or::after { height: 1px; width: auto; }
}
.verify-box.verify-two { margin: 44px 0 0; }
.verify-wide { margin: 20px 0 72px; }
.pc-qr-img { padding: 1cqw; }
.verify-wide .verify-tips div { background: #fff; border: 1px solid #DCEBE2; }
@media (max-width: 640px) { .verify-form input { flex: none; width: 100%; } }

/* ===================================================================== v1.11: home Premium band + FAQ */
@property --ring { syntax: "<angle>"; inherits: false; initial-value: 0deg; }
.up-band { position: relative; overflow: hidden; background: var(--grad-dark); color: #fff; }
.up-bg { position: absolute; inset: 0; pointer-events: none; background-image: linear-gradient(rgba(196, 241, 104, .07) 1px, transparent 1px), linear-gradient(90deg, rgba(196, 241, 104, .07) 1px, transparent 1px); background-size: 104px 30px; -webkit-mask-image: radial-gradient(70% 80% at 30% 40%, #000, transparent 75%); mask-image: radial-gradient(70% 80% at 30% 40%, #000, transparent 75%); }
.up-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, 460px); gap: clamp(36px, 5vw, 90px); align-items: center; }
.up-copy h2 { color: #fff; margin: 16px 0 12px; font-size: clamp(1.9rem, 3.4vw, 3.1rem); letter-spacing: -.035em; line-height: 1.05; }
.up-lead { color: #BFE3CD; font-size: 18px; margin: 0 0 22px; max-width: 560px; }
.up-lead b { color: var(--lime); }
.up-unlock { background: rgba(255, 255, 255, .06); border: 1px solid rgba(196, 241, 104, .18); border-radius: 20px; padding: 18px 18px 16px; backdrop-filter: blur(6px); }
.up-top { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
.up-switch { position: relative; display: inline-grid; grid-template-columns: 1fr 1fr; padding: 4px; border-radius: 999px; background: rgba(0, 0, 0, .25); border: 1px solid rgba(255, 255, 255, .12); }
.up-switch button { position: relative; z-index: 1; border: 0; background: none; color: #BFE3CD; font: 700 14px var(--font); padding: 8px 16px; border-radius: 999px; cursor: pointer; transition: color .25s; white-space: nowrap; }
.up-switch button.is-on { color: var(--forest); }
.up-switch i { position: absolute; top: 4px; bottom: 4px; left: 4px; width: calc(50% - 4px); border-radius: 999px; background: #fff; transition: transform .35s var(--ease), background .35s; }
.up-unlock.is-premium .up-switch i { transform: translateX(100%); background: var(--lime); }
.up-count { color: #DDF2E5; font-size: 15px; }
.up-count b { font-size: 22px; color: #fff; font-variant-numeric: tabular-nums; }
.up-unlock.is-premium .up-count b { color: var(--lime); }
.up-meter { height: 8px; margin: 14px 0 14px; border-radius: 8px; background: rgba(255, 255, 255, .1); overflow: hidden; }
.up-meter span { display: block; height: 100%; border-radius: 8px; background: linear-gradient(90deg, #3FBF78, var(--lime)); transition: width .8s var(--ease); box-shadow: 0 0 18px rgba(196, 241, 104, .5); }
.up-cats { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.up-cats li { display: inline-flex; align-items: center; gap: 7px; padding: 6px 12px 6px 9px; border-radius: 999px; font-size: 14px; font-weight: 600; color: #9DBCAA; background: rgba(0, 0, 0, .18); border: 1px solid rgba(255, 255, 255, .08); transition: background .35s, color .35s, border-color .35s, transform .35s var(--ease); }
.up-cats li small { font-size: 12px; opacity: .7; font-weight: 700; }
.up-cats li svg { width: 15px; height: 15px; flex: none; }
.up-cats li .i-ok { display: none; }
.up-cats li.is-open { color: var(--forest); background: var(--lime); border-color: var(--lime); transform: translateY(-1px); }
.up-cats li.is-open .i-ok { display: block; } .up-cats li.is-open .i-lock { display: none; }
.up-feats { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; margin-top: 18px; }
.up-feat { display: flex; gap: 12px; align-items: flex-start; padding: 16px; border-radius: 16px; background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .1); transition: transform .3s var(--ease), border-color .3s, background .3s; }
.up-feat:hover { transform: translateY(-3px); border-color: rgba(196, 241, 104, .45); background: rgba(255, 255, 255, .08); }
.up-feat.spot-card::before { background: radial-gradient(300px circle at var(--cx, 50%) var(--cy, 50%), rgba(196, 241, 104, .14), transparent 50%); }
.up-ico { width: 38px; height: 38px; flex: none; display: grid; place-items: center; border-radius: 12px; background: rgba(196, 241, 104, .14); color: var(--lime); }
.up-ico svg { width: 21px; height: 21px; }
.up-feat p { margin: 0; color: #DDF2E5; font-size: 14.5px; line-height: 1.45; }
.up-pay { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 20px; }
.up-pay span { color: #9DBCAA; font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; margin-right: 4px; }
.up-pay b { font-size: 13px; font-weight: 700; color: #fff; padding: 5px 11px; border-radius: 8px; background: rgba(255, 255, 255, .08); border: 1px solid rgba(255, 255, 255, .12); }
.up-card { position: relative; }
.up-card::before { content: ""; position: absolute; inset: 8% -6% -4%; background: radial-gradient(closest-side, rgba(196, 241, 104, .35), transparent); filter: blur(30px); pointer-events: none; }
.up-ring { position: relative; padding: 2px; border-radius: 24px; background: conic-gradient(from var(--ring), rgba(196, 241, 104, .15), var(--lime), #3FBF78, rgba(196, 241, 104, .15) 40%, rgba(196, 241, 104, .15)); animation: ringSpin 6s linear infinite; }
.up-ring .plan-card { border: 0; border-radius: 22px; box-shadow: 0 40px 70px -40px rgba(0, 0, 0, .7); }
@keyframes ringSpin { to { --ring: 360deg; } }
.up-guarantee { position: relative; display: flex; gap: 10px; align-items: center; margin-top: 16px; padding: 12px 16px; border-radius: 14px; color: #DDF2E5; font-size: 14px; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .1); }
.up-guarantee svg { color: var(--lime); flex: none; }
.up-guarantee b { color: #fff; }
@media (max-width: 960px) { .up-grid { grid-template-columns: 1fr; } .up-card { max-width: 520px; } }
@media (prefers-reduced-motion: reduce) { .up-ring { animation: none; } }

.faq-band { background: linear-gradient(180deg, var(--mint), #F7FBF8); }
.faq-wrap { display: grid; grid-template-columns: minmax(280px, 380px) minmax(0, 1fr); gap: clamp(32px, 5vw, 80px); align-items: start; }
.faq-side { position: sticky; top: calc(var(--hdr) + 28px); }
.faq-side h2 { margin: 14px 0 8px; font-size: clamp(2rem, 3.4vw, 3rem); letter-spacing: -.035em; }
.faq-side > p { margin: 0 0 20px; }
.faq-search { display: flex; align-items: center; gap: 10px; height: 50px; padding: 0 16px; border-radius: 999px; background: #fff; border: 1.5px solid #CFE3D6; color: var(--muted); transition: border-color .2s, box-shadow .2s; }
.faq-search:focus-within { border-color: var(--excel); box-shadow: 0 0 0 4px rgba(16, 124, 65, .12); color: var(--excel); }
.faq-search input { flex: 1; min-width: 0; border: 0; outline: 0; background: none; font: 500 16px var(--font); color: var(--ink); }
.faq-cats { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 24px; }
.faq-cats button { border: 1px solid #CFE3D6; background: #fff; color: var(--ink-2); font: 600 14px var(--font); padding: 7px 14px; border-radius: 999px; cursor: pointer; transition: background .2s, color .2s, border-color .2s; }
.faq-cats button:hover { border-color: var(--excel); color: var(--excel); }
.faq-cats button.is-on { background: var(--forest); border-color: var(--forest); color: #fff; }
.faq-help { position: relative; overflow: hidden; display: grid; gap: 6px; justify-items: start; padding: 22px; border-radius: 20px; color: #DDF2E5; background: var(--grad-dark); font-size: 14.5px; }
.faq-help::after { content: ""; position: absolute; right: -40px; top: -40px; width: 140px; height: 140px; border-radius: 50%; background: radial-gradient(closest-side, rgba(196, 241, 104, .35), transparent); }
.faq-help b { color: #fff; font-size: 17px; }
.faq-help .btn { margin-top: 8px; }
.faq-help-ico { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 12px; background: rgba(196, 241, 104, .16); color: var(--lime); margin-bottom: 4px; }
.faq-list { display: grid; gap: 12px; }
.qa { background: #fff; border: 1px solid #D7E7DD; border-radius: 18px; transition: border-color .25s, box-shadow .25s, transform .25s var(--ease); }
.qa:hover { border-color: #B9D6C4; transform: translateY(-1px); }
.qa.is-open { border-color: var(--excel); box-shadow: 0 22px 40px -32px rgba(6, 42, 28, .55); }
.qa[hidden] { display: none; }
.qa-q { width: 100%; display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; align-items: center; gap: 14px; padding: 18px 20px; border: 0; background: none; text-align: left; cursor: pointer; font: inherit; color: var(--ink); }
.qa-n { font: 700 13px var(--mono); color: #8BA396; width: 28px; }
.qa.is-open .qa-n { color: var(--excel); }
.qa-t { font-weight: 700; font-size: 17px; line-height: 1.35; }
.qa-tag { font-size: 12px; font-weight: 600; color: #6B8577; background: var(--mint); padding: 4px 10px; border-radius: 999px; white-space: nowrap; }
.qa-i { position: relative; width: 32px; height: 32px; border-radius: 50%; background: var(--mint); transition: background .25s, transform .35s var(--ease); }
.qa-i::before, .qa-i::after { content: ""; position: absolute; left: 50%; top: 50%; width: 12px; height: 2px; margin: -1px 0 0 -6px; background: var(--forest); border-radius: 2px; transition: transform .35s var(--ease), background .25s; }
.qa-i::after { transform: rotate(90deg); }
.qa.is-open .qa-i { background: var(--excel); transform: rotate(180deg); }
.qa.is-open .qa-i::before, .qa.is-open .qa-i::after { background: #fff; }
.qa.is-open .qa-i::after { transform: rotate(0deg); }
.qa-a { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .4s var(--ease); }
.qa-a > div { overflow: hidden; }
.qa-a p { margin: 0; padding: 0 20px 20px 62px; color: var(--ink-2); font-size: 16px; line-height: 1.65; }
.qa.is-open .qa-a { grid-template-rows: 1fr; }
.faq-empty { padding: 24px; border-radius: 18px; background: #fff; border: 1px dashed #B9D6C4; color: var(--ink-2); text-align: center; }
@media (max-width: 900px) {
  .faq-wrap { grid-template-columns: 1fr; }
  .faq-side { position: static; }
}
@media (max-width: 560px) {
  .qa-tag { display: none; }
  .qa-q { grid-template-columns: auto minmax(0, 1fr) auto; gap: 10px; padding: 16px; }
  .qa-a p { padding: 0 16px 18px 16px; }
}
.up-band .plan-card { color: var(--ink); }
.up-band .plan-card h3 { color: var(--forest); }
.faq-help .btn { background: var(--lime); color: var(--forest); border-color: var(--lime); }
.faq-help .btn:hover { background: #D4F78A; }
.up-band.up-hero { padding-top: calc(var(--hdr) + clamp(40px, 6vw, 80px)); }
.up-hero .up-copy h1 { color: #fff; margin: 16px 0 12px; font-size: clamp(2.1rem, 3.8vw, 3.4rem); letter-spacing: -.035em; line-height: 1.05; }
/* Wordmark: "Excel" bold, "Quickly" semi-bold */
.logo .wm-b { font-weight: 600; }
/* FAQ without numbering, search or topic filters */
.qa-q { grid-template-columns: minmax(0, 1fr) auto auto; padding: 18px 20px 18px 24px; }
.qa-a p { padding: 0 24px 22px 24px; }
.faq-side h2 { margin-bottom: 22px; }
@media (max-width: 560px) { .qa-q { grid-template-columns: minmax(0, 1fr) auto; padding: 16px; } .qa-a p { padding: 0 16px 18px; } }
.row-actions .btn-del { color: var(--bad); } .row-actions .btn-del:hover { background: var(--bad-50); border-color: #F4C7C2; }

/* ===================================================================== v1.12: curriculum cards with green covers */
.l-card { padding: 0; gap: 0; overflow: hidden; background: #fff; border: 1px solid #D6E7DC; min-height: 0; }
.l-card .lc-cover { --c1: #0B4A30; --c2: #107C41; position: relative; height: 104px; padding: 14px 16px; display: flex; flex-direction: column; justify-content: space-between; color: #fff; overflow: hidden;
  background: radial-gradient(120% 140% at 100% 0, rgba(196, 241, 104, .28), transparent 55%), linear-gradient(135deg, var(--c1), var(--c2)); }
.l-card .lc-cover::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255, 255, 255, .09) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .09) 1px, transparent 1px); background-size: 34px 17px; -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 45%); mask-image: linear-gradient(90deg, transparent 0, #000 45%); transition: transform .6s var(--ease); }
.l-card:hover .lc-cover::before { transform: translate(-6px, -3px); }
.l-card.c1 .lc-cover { --c1: #0A4733; --c2: #1F8F5F; }
.l-card.c2 .lc-cover { --c1: #053F33; --c2: #0F766E; }
.l-card.c3 .lc-cover { --c1: #123D22; --c2: #3E7D23; }
.l-card.c4 .lc-cover { --c1: #08352A; --c2: #2E7D5B; }
.l-card.c5 .lc-cover { --c1: #163A2C; --c2: #40916C; }
.lc-cover > * { position: relative; }
.lc-no { position: absolute !important; right: 10px; bottom: -14px; font: 800 64px/1 var(--font); letter-spacing: -.04em; color: transparent; -webkit-text-stroke: 1.5px rgba(255, 255, 255, .22); pointer-events: none; }
.lc-cat { display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px; font-weight: 700; letter-spacing: .04em; color: rgba(255, 255, 255, .85); }
.lc-cat svg { width: 16px; height: 16px; color: var(--lime); }
.lc-fx { align-self: flex-start; font: 600 15px/1 var(--mono); color: var(--lime); background: rgba(0, 0, 0, .25); border: 1px solid rgba(196, 241, 104, .25); padding: 7px 10px; border-radius: 8px; max-width: 75%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lc-fx::after { content: ""; display: inline-block; width: 2px; height: 1em; margin-left: 3px; vertical-align: -2px; background: var(--lime); opacity: 0; }
.l-card:hover .lc-fx::after, .l-card.is-next .lc-fx::after { animation: caret 1s steps(1) infinite; }
@keyframes caret { 50% { opacity: 1; } }
.lc-badge { position: absolute !important; top: 12px; right: 12px; display: inline-flex; align-items: center; gap: 5px; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 999px; }
.lc-badge.next { background: var(--lime); color: var(--forest); box-shadow: 0 0 0 0 rgba(196, 241, 104, .6); animation: nextPulse 2s ease-out infinite; }
.lc-badge.done { background: #fff; color: var(--excel); }
@keyframes nextPulse { 70% { box-shadow: 0 0 0 10px rgba(196, 241, 104, 0); } 100% { box-shadow: 0 0 0 0 rgba(196, 241, 104, 0); } }
.lc-body { display: flex; flex-direction: column; gap: 8px; padding: 16px 18px 16px; flex: 1; background: linear-gradient(180deg, #F3FAF5, #fff 60%); }
.l-card h3 { margin: 0; font-size: 17px; }
.l-card p { margin: 0; }
.l-card .foot { display: flex; align-items: center; gap: 10px; margin-top: auto; padding-top: 12px; border-top: 1px dashed #D6E7DC; font-size: 13px; color: var(--muted); }
.lc-min { display: inline-flex; align-items: center; gap: 5px; font-weight: 600; color: var(--excel); background: var(--mint); padding: 3px 9px; border-radius: 999px; }
.lc-steps { flex: 1; height: 4px; border-radius: 4px; background: #E3EFE7; overflow: hidden; }
.lc-steps i { display: block; height: 100%; background: linear-gradient(90deg, #3FBF78, var(--lime)); border-radius: 4px; }
.l-card .step-no { font-weight: 700; font-variant-numeric: tabular-nums; }
.l-card { transition: box-shadow .3s, border-color .3s, transform .3s var(--ease); }
.l-card:hover { transform: translateY(-2px); border-color: #A9CFB8; box-shadow: 0 22px 40px -30px rgba(6, 42, 28, .55); }
.l-card.is-next { border-color: var(--lime); box-shadow: 0 0 0 3px rgba(196, 241, 104, .7), 0 24px 44px -28px rgba(6, 42, 28, .6); }
.l-card.is-done .lc-body { background: linear-gradient(180deg, #E9F6EE, #fff 70%); }
.l-card.is-done .lc-cover { --c1: #0B4A30; --c2: #107C41; }
.l-card.is-done:not(:has(.lc-badge)) .lc-cover::after { content: "✓"; position: absolute; top: 12px; right: 12px; width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%; background: #fff; color: var(--excel); font-weight: 800; font-size: 13px; }
@media (prefers-reduced-motion: reduce) { .lc-badge.next { animation: none; } }

/* ===================================================================== v1.13: formulas explained in plain words */
.fx-card { margin: -6px 0 1.4em; padding: 16px 18px; border-radius: 0 0 14px 14px; background: #EEF8F1; border: 1px solid #CFE6D7; border-top: 0; font-size: 15.5px; color: var(--ink-2); }
.lesson-text pre.f + .fx-card { margin-top: -1.2em; }
.lesson-text pre.f:has(+ .fx-card) { border-bottom-left-radius: 0; border-bottom-right-radius: 0; }
.fx-line { margin: 12px 0 6px; } .fx-line:first-child { margin-top: 0; }
.fx-line code { font: 600 13.5px var(--mono); color: var(--forest); background: #fff; border: 1px solid #CFE6D7; padding: 3px 8px; border-radius: 6px; }
.fx-say { display: flex; gap: 12px; align-items: flex-start; }
.fx-ico { flex: none; width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; background: var(--lime); font-size: 15px; }
.fx-say b { display: block; font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--excel); margin-bottom: 2px; }
.fx-say p { margin: 0; font-size: 16px; color: var(--forest); line-height: 1.55; }
.fx-parts { margin: 12px 0 0 42px; }
.fx-parts summary { cursor: pointer; font-weight: 700; font-size: 14px; color: var(--excel); list-style: none; display: inline-flex; align-items: center; gap: 6px; }
.fx-parts summary::-webkit-details-marker { display: none; }
.fx-parts summary::before { content: "▸"; transition: transform .2s; }
.fx-parts[open] summary::before { transform: rotate(90deg); }
.fx-parts dl { margin: 10px 0 0; display: grid; gap: 6px; }
.fx-parts dl > div { display: grid; grid-template-columns: minmax(64px, auto) 1fr; gap: 12px; align-items: baseline; padding: 6px 10px; background: #fff; border-radius: 10px; border: 1px solid #DCEDE2; }
.fx-parts dt code { font: 700 14px var(--mono); color: var(--excel); white-space: nowrap; }
.fx-parts dd { margin: 0; font-size: 14.5px; line-height: 1.5; }
.fx-try { margin: 12px 0 0 42px; font-size: 14.5px; }
.fx-try b { display: block; font-size: 14px; color: var(--excel); margin-bottom: 6px; }
.fx-try ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.fx-try code { font: 700 13.5px var(--mono); color: var(--forest); background: #fff; border: 1px solid #CFE6D7; padding: 2px 7px; border-radius: 6px; margin-right: 6px; }
.fx-tip { cursor: help; text-decoration: underline dotted rgba(16, 124, 65, .6); text-underline-offset: 3px; }
.fx-tip:focus-visible { outline: 2px solid var(--excel); outline-offset: 2px; border-radius: 4px; }
.fx-pop { position: absolute; z-index: 90; display: grid; gap: 4px; padding: 10px 12px; border-radius: 12px; background: var(--forest); color: #E8F6EE; font-size: 14px; line-height: 1.45; box-shadow: 0 18px 36px -18px rgba(0, 0, 0, .5); opacity: 0; transform: translateY(4px); pointer-events: none; transition: opacity .15s, transform .15s; }
.fx-pop.show { opacity: 1; transform: none; }
.fx-pop code { font: 700 13px var(--mono); color: var(--lime); }
.fx-mini { display: block; margin-top: 8px; padding-top: 8px; border-top: 1px dashed #CFE6D7; font-size: 14px; }
@media (max-width: 560px) { .fx-parts, .fx-try { margin-left: 0; } .fx-parts dl > div { grid-template-columns: 1fr; gap: 2px; } }

/* ===================================================================== v1.14: custom logo icon + size (Admin → Settings) */
.logo img.logo-icon { width: 28px; height: 28px; object-fit: contain; flex: none; border-radius: 4px; }
.site-header .logo .logo-icon { width: var(--logo-size, 30px); height: var(--logo-size, 30px); }
@media (max-width: 640px) { .site-header .logo .logo-icon { width: min(var(--logo-size, 30px), 36px); height: min(var(--logo-size, 30px), 36px); } }
.pcert .pc-logo img.logo-icon { width: 2.5cqw; height: 2.5cqw; }
.logo-admin { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.logo-admin input[type=range] { width: 100%; accent-color: var(--excel); }
.logo-preview { display: flex; align-items: center; min-height: 76px; padding: 12px 18px; border-radius: 14px; background: var(--forest); margin-top: 8px; }
.logo-preview.light { background: #fff; border: 1px solid #DCEBE2; }
.logo-preview.light .logo .wm-b { color: var(--forest); }
.logo-preview .logo { font-size: 20px; }
.logo-preview .logo .logo-icon { width: var(--logo-size); height: var(--logo-size); }
@media (max-width: 860px) { .logo-admin { grid-template-columns: 1fr; } }
.logo-preview.light .logo .wm-a { color: var(--excel); }

/* ===================================================================== v1.15: one-line headings + practice panel design */
.x-head h2.one-line { max-width: none; }
@media (min-width: 900px) {
  .x-head h2.one-line { white-space: nowrap; }
}
@media (min-width: 1180px) { .up-lead { max-width: none; white-space: nowrap; font-size: 17px; } }

/* Header: dark forest band */
.practice { border: 1px solid #CFE3D6; border-radius: var(--r-card); box-shadow: 0 2px 4px rgba(6, 42, 28, .05), 0 24px 48px -28px rgba(6, 42, 28, .45); }
.practice-head { position: relative; isolation: isolate; gap: 14px; padding: 16px 20px; border-bottom: 0; color: var(--on-dark); background: var(--grad-dark); }
.practice-head::before { content: ""; position: absolute; inset: 0; z-index: -1; opacity: .5; pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 28px 22px; -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 45%); mask-image: linear-gradient(90deg, transparent 0, #000 45%); }
.practice-head h2 { color: #fff; font-size: 18px; letter-spacing: -.01em; line-height: 1.2; }
.ph-ico { flex: none; width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: var(--lime); color: var(--forest); box-shadow: 0 6px 16px -6px rgba(196, 241, 104, .6); }
.ph-title { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.ph-sub { font-size: 13px; color: var(--on-dark-2); }
.ph-xp { display: flex; flex-direction: column; gap: 6px; margin-left: 8px; }
.practice-head .xp-chip { background: rgba(196, 241, 104, .14); color: var(--lime); border: 1px solid rgba(196, 241, 104, .35); padding: 3px 10px; font-size: 12.5px; }
.ph-bar { display: block; width: 100%; min-width: 96px; height: 5px; border-radius: 99px; background: rgba(255, 255, 255, .12); overflow: hidden; }
.ph-bar i { display: block; height: 100%; width: 0; border-radius: inherit; background: linear-gradient(90deg, var(--lime-2), var(--lime)); transition: width .5s cubic-bezier(.2, .8, .2, 1); }
.practice-head .timer { background: var(--lime); color: var(--forest); }
.practice-head .timer.low { background: #FF8A7A; color: #3B0A05; }
.practice-head .btn-ghost { background: rgba(255, 255, 255, .07); color: #fff; border-color: rgba(255, 255, 255, .22); }
.practice-head .btn-ghost:hover { background: rgba(255, 255, 255, .13); border-color: var(--lime); color: #fff; }

/* Steps column */
.tasks { padding: 18px 18px 16px; gap: 12px; background: radial-gradient(420px 220px at 0 0, rgba(196, 241, 104, .16), transparent 70%), linear-gradient(180deg, #F2F9F4, #FAFDFB 60%); border-right-color: #DCEBE1; }
.tasks-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.tasks-lbl { font-size: 11.5px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--forest-3); }
.tasks-count { font-size: 12px; font-weight: 600; color: var(--excel); background: #fff; border: 1px solid #CFE3D6; padding: 2px 9px; border-radius: 99px; }
#taskList { gap: 8px !important; }
.task { position: relative; padding: 11px 12px; border-radius: 12px; border: 1px solid transparent; transition: background .2s, box-shadow .2s, color .2s; }
.task:not(:last-child)::after { content: ""; position: absolute; left: 24px; top: 38px; bottom: -18px; width: 2px; border-radius: 2px; background: #D3E4D9; }
.task.is-done:not(:last-child)::after { background: var(--excel); }
.task .n { position: relative; z-index: 1; border-radius: 50%; background: #fff; border-color: #C6DBCD; width: 26px; height: 26px; }
.task.is-current { background: #fff; border-color: var(--excel); box-shadow: 0 10px 24px -14px rgba(6, 42, 28, .45), 0 0 0 3px rgba(16, 124, 65, .1); }
.task.is-current .n { background: var(--excel); border-color: var(--excel); color: #fff; box-shadow: 0 0 0 4px rgba(16, 124, 65, .14); }
.task.is-done { color: var(--muted); }
.task.is-done .n { background: var(--excel); border-color: var(--excel); color: #fff; font-size: 13px; }
.task.is-done b, .task.is-done strong { color: var(--ink-2); }
.task-actions { gap: 8px; padding-top: 14px; border-top: 1px dashed #CFE3D6; align-items: center; }
.task-actions .btn-primary { box-shadow: 0 8px 18px -10px rgba(16, 124, 65, .8); padding-left: 18px; padding-right: 18px; }
.task-actions .btn-ghost { display: inline-flex; align-items: center; gap: 6px; background: #fff; border-color: #CFE3D6; }
.task-actions .btn-ghost:hover { border-color: var(--excel); color: var(--excel); }
.task-actions .btn-ghost svg { color: #C98A0C; }
.task-actions .link-btn { color: var(--excel); }

.feedback { border-radius: 10px; padding: 10px 12px 10px 38px; position: relative; }
.feedback::before { position: absolute; left: 11px; top: 9px; width: 19px; height: 19px; border-radius: 50%; display: grid; place-items: center; font: 700 12px var(--font); }
.feedback.good { border: 1px solid #BFE0CC; }
.feedback.good::before { content: "✓"; background: var(--excel); color: #fff; }
.feedback.bad { border: 1px solid #F6C9C3; }
.feedback.bad::before { content: "!"; background: var(--bad); color: #fff; }
.feedback.info { background: #fff; border: 1px solid #DCEBE1; }
.feedback.info::before { content: "i"; background: var(--mint-2); color: var(--forest-3); }
.hintbox { border-radius: 10px; padding: 10px 12px 10px 38px; position: relative; background: #FFF8E6; }
.hintbox::before { content: ""; position: absolute; left: 11px; top: 10px; width: 18px; height: 18px; background: #C98A0C;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M9 18h6M10 21h4M12 3a6 6 0 0 0-3.6 10.8c.6.5 1 1.2 1 2V16h5.2v-.2c0-.8.4-1.5 1-2A6 6 0 0 0 12 3z'/%3E%3C/svg%3E") center / contain no-repeat;
          mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M9 18h6M10 21h4M12 3a6 6 0 0 0-3.6 10.8c.6.5 1 1.2 1 2V16h5.2v-.2c0-.8.4-1.5 1-2A6 6 0 0 0 12 3z'/%3E%3C/svg%3E") center / contain no-repeat; }

/* Assessment gate + done box */
.start-gate { padding: 48px 24px; background: radial-gradient(500px 200px at 50% 0, rgba(196, 241, 104, .2), transparent 70%), #F7FBF8; }
.practice-done { padding: 30px 24px; border-top: 1px solid #DCEBE1; background: radial-gradient(520px 200px at 50% 0, rgba(196, 241, 104, .22), transparent 70%), linear-gradient(#F2F9F4, #fff); }
.practice-done h3 { color: var(--forest); font-size: 22px; }

@media (max-width: 1100px) { .tasks { border-bottom-color: #DCEBE1; } }
@media (max-width: 640px) {
  .practice-head { padding: 14px; gap: 10px; }
  .ph-ico { width: 36px; height: 36px; border-radius: 10px; }
  .ph-sub { display: none; }
  .ph-xp { margin-left: 0; }
  .ph-bar { min-width: 72px; }
  .practice-head .sp { display: none; }
  .practice-head .btn:first-of-type { margin-left: auto; }
  .practice-head .btn-sm { padding-left: 12px; padding-right: 12px; }
}

/* ===================================================================== v1.16: clearer practice grid lines */
.xs-c { border-right-color: #C9D6CE; border-bottom-color: #C9D6CE; }
.xs-grid th { background: #EEF4F0; border-right-color: #B9CCC0; border-bottom-color: #B9CCC0; color: #4C5E55; }
.xs-bar, .xs-name, .xs-fx { border-color: #C9D6CE; }

/* ===================================================================== v1.17: certificate behind the price card + Free/Premium feature dimming */
.up-cert { position: absolute; z-index: 0; width: 124%; right: -16%; top: -33%; container-type: inline-size; transform: rotate(6deg); transform-origin: 50% 50%; pointer-events: none;
  filter: drop-shadow(0 40px 60px rgba(0, 0, 0, .45)); -webkit-mask-image: linear-gradient(200deg, #000 35%, rgba(0, 0, 0, .55) 70%, rgba(0, 0, 0, .15)); mask-image: linear-gradient(200deg, #000 35%, rgba(0, 0, 0, .55) 70%, rgba(0, 0, 0, .15)); }
.up-cert .pcert { box-shadow: 0 0 0 1px rgba(201, 162, 74, .5); }
.up-cert .pcert::after { content: ""; position: absolute; inset: 0; background: linear-gradient(160deg, rgba(6, 42, 28, 0) 30%, rgba(6, 42, 28, .35)); pointer-events: none; }
.up-card > .up-ring { z-index: 1; }
.up-card::before { z-index: 0; }
@media (max-width: 960px) {
  .up-card { margin-top: 54vw; }
  .up-cert { width: 92%; right: -6%; top: auto; bottom: calc(100% - 16vw); transform: rotate(-4deg); -webkit-mask-image: linear-gradient(180deg, #000 45%, rgba(0, 0, 0, .1)); mask-image: linear-gradient(180deg, #000 45%, rgba(0, 0, 0, .1)); }
}
@media (max-width: 960px) and (min-width: 600px) { .up-card { margin-top: 290px; } .up-cert { bottom: calc(100% - 90px); } }

.up-feat { position: relative; transition: transform .3s var(--ease), border-color .3s, background .3s, opacity .45s, filter .45s; }
.up-tag { position: absolute; top: 10px; right: 10px; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: rgba(0, 0, 0, .25); color: #9DBCAA; transition: background .35s, color .35s; }
.up-tag svg { width: 12px; height: 12px; }
.up-tag .i-ok { display: none; }
.up-feat p { padding-right: 18px; }
.up-feats:not(.is-premium) .up-feat { opacity: .42; filter: grayscale(1); border-style: dashed; }
.up-feats:not(.is-premium) .up-feat:hover { transform: none; }
.up-feats.is-premium .up-feat { opacity: 1; filter: none; border-color: rgba(196, 241, 104, .35); background: rgba(196, 241, 104, .07); }
.up-feats.is-premium .up-tag { background: var(--lime); color: var(--forest); }
.up-feats.is-premium .up-tag .i-ok { display: block; } .up-feats.is-premium .up-tag .i-lock { display: none; }
.up-feats.is-premium .up-feat:nth-child(2) { transition-delay: .08s; } .up-feats.is-premium .up-feat:nth-child(3) { transition-delay: .16s; }

/* ===================================================================== v1.18: daily challenge redesign */
.chx-hero { isolation: isolate; }
.chx-hero::after { content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none; opacity: .45;
  background-image: linear-gradient(rgba(255, 255, 255, .045) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 64px 30px; -webkit-mask-image: radial-gradient(80% 90% at 75% 40%, #000, transparent 75%); mask-image: radial-gradient(80% 90% at 75% 40%, #000, transparent 75%); }
.chx-glow { position: absolute; z-index: -1; right: -10%; top: -30%; width: 60%; aspect-ratio: 1; border-radius: 50%; background: radial-gradient(closest-side, rgba(196, 241, 104, .2), transparent); filter: blur(20px); pointer-events: none; }
.chx-top { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 400px); gap: clamp(28px, 4vw, 64px); align-items: end; }
.chx-intro h1 { margin-bottom: 0; }
.chx-diff { display: inline-flex; align-items: center; gap: 7px; }
.chx-bars { display: inline-flex; align-items: flex-end; gap: 2px; height: 12px; }
.chx-bars i { width: 3px; border-radius: 2px; background: rgba(255, 255, 255, .25); }
.chx-bars i:nth-child(1) { height: 5px; } .chx-bars i:nth-child(2) { height: 8px; } .chx-bars i:nth-child(3) { height: 12px; }
.chx-bars[data-level="1"] i:nth-child(1), .chx-bars[data-level="2"] i:nth-child(-n+2), .chx-bars[data-level="3"] i { background: var(--lime); }

.chx-stats { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.chx-stat { display: flex; flex-direction: column; gap: 4px; min-width: 176px; padding: 14px 18px; border-radius: 16px; background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12); backdrop-filter: blur(6px); }
.chx-lbl { font-size: 12px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--on-dark-2); }
.chx-stat b { display: inline-flex; align-items: center; gap: 6px; font-size: 24px; line-height: 1.15; color: #fff; font-variant-numeric: tabular-nums; }
.chx-day { display: block; height: 4px; margin-top: 6px; border-radius: 4px; background: rgba(255, 255, 255, .12); overflow: hidden; }
.chx-day i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, #3FBF78, var(--lime)); transition: width 1s linear; }
.chx-flame { color: #FFB547; display: inline-flex; filter: drop-shadow(0 0 8px rgba(255, 181, 71, .55)); animation: chxFlame 2.4s ease-in-out infinite; transform-origin: 50% 90%; }
@keyframes chxFlame { 0%, 100% { transform: scale(1) rotate(-2deg); } 50% { transform: scale(1.08) rotate(2deg); } }
.chx-week { list-style: none; display: flex; gap: 4px; margin: 6px 0 0; padding: 0; }
.chx-week li { width: 22px; height: 22px; display: grid; place-items: center; border-radius: 7px; font-size: 10.5px; font-weight: 700; color: var(--on-dark-2); background: rgba(0, 0, 0, .2); border: 1px solid rgba(255, 255, 255, .08); }
.chx-week li.is-done { background: var(--lime); color: var(--forest); border-color: var(--lime); }
.chx-week li.is-today { border-color: var(--lime); box-shadow: 0 0 0 2px rgba(196, 241, 104, .25); }
.chx-week li.is-future { opacity: .45; }
.chx-week li.is-pop { animation: chxPop .6s var(--ease); }
@keyframes chxPop { 0% { transform: scale(.6); } 60% { transform: scale(1.25); } 100% { transform: scale(1); } }
.chx-link { margin-top: 4px; font-size: 13px; font-weight: 600; color: var(--lime); text-decoration: none; }
.chx-link:hover { text-decoration: underline; color: var(--lime); }
.chx-pips { display: flex; gap: 4px; margin-top: 6px; }
.chx-pips i { width: 12px; height: 6px; border-radius: 3px; background: var(--lime); }
.chx-pips i.is-used { background: rgba(255, 255, 255, .16); }

/* Scoreboard card */
.chx-score { position: relative; padding: 20px 22px; border-radius: 22px; color: var(--ink); background: #fff; box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .7), 0 0 0 1px rgba(196, 241, 104, .4); overflow: hidden; }
.chx-score::before { content: ""; position: absolute; inset: 0 0 auto; height: 4px; background: linear-gradient(90deg, #3FBF78, var(--lime)); }
.chx-score .chx-lbl { color: var(--muted); }
.chx-pot-num { display: flex; align-items: baseline; gap: 8px; margin-top: 4px; }
.chx-pot-num b { font-size: 52px; line-height: 1; font-weight: 800; letter-spacing: -.03em; color: var(--forest); font-variant-numeric: tabular-nums; }
.chx-pot-num span { font-size: 14px; font-weight: 600; color: var(--excel); }
.chx-pot-bar { height: 8px; margin: 12px 0 8px; border-radius: 8px; background: #E5F0E9; overflow: hidden; }
.chx-pot-bar i { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--excel), #3FBF78 60%, var(--lime)); transition: width .6s var(--ease); }
.chx-pot-note { margin: 0; font-size: 13px; color: var(--muted); }
.chx-score.is-drop .chx-pot-num b { animation: chxShake .45s; color: #B4540A; }
@keyframes chxShake { 0%, 100% { transform: none; } 25% { transform: translateX(-4px); } 50% { transform: translateX(4px); } 75% { transform: translateX(-2px); } }
.chx-score-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 16px; padding-top: 14px; border-top: 1px dashed #D6E7DC; }
.chx-score-row b { display: block; margin-top: 2px; font-size: 19px; color: var(--forest); font-variant-numeric: tabular-nums; }
.chx-score-row .chx-lbl { font-size: 10.5px; }
.chx-score.is-solved { box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .7), 0 0 0 2px var(--lime); }
.chx-score.is-solved #clock { color: var(--excel); }

/* Body */
.chx-body { padding-top: 28px; }
.chx-side { display: grid; gap: 16px; position: sticky; top: calc(var(--hdr) + 24px); }
.chx-mission { background: #fff; border: 1px solid #D6E7DC; border-radius: var(--r-card); padding: 20px 22px 22px; display: grid; gap: 14px; box-shadow: 0 20px 40px -30px rgba(6, 42, 28, .45); }
.chx-mission-head { display: flex; align-items: center; gap: 12px; padding-bottom: 14px; border-bottom: 1px solid #E5F0E9; }
.chx-mission-head b { display: block; font-size: 16px; color: var(--forest); }
.chx-mission-head span { font-size: 13px; color: var(--muted); }
.chx-target { width: 40px; height: 40px; flex: none; border-radius: 12px; display: grid; place-items: center; color: var(--excel); background: linear-gradient(135deg, #E3F6EA, #F3FCE0); border: 1px solid #CFE6D8; }
.chx-mission .task-actions { border-top: 0; padding-top: 0; flex-wrap: wrap; }
.chx-mission #hintBtn small { font-size: 11.5px; font-weight: 700; color: #B4540A; }
.chx-board { background: #fff; border: 1px solid #D6E7DC; border-radius: var(--r-card); padding: 16px 18px; }
.chx-board-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.chx-board-head b { font-size: 14.5px; color: var(--forest); }
.chx-board-head a { font-size: 13px; font-weight: 600; color: var(--excel); text-decoration: none; }
.chx-board ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.chx-board li { display: flex; align-items: center; gap: 10px; padding: 7px 8px; border-radius: 10px; font-size: 14px; }
.chx-board li:nth-child(odd) { background: #F5FAF7; }
.chx-board li.is-me { background: #EEF9D9; }
.chx-board li em { font-style: normal; font-size: 11px; font-weight: 700; color: var(--excel); background: #fff; border: 1px solid #CFE6D8; border-radius: 99px; padding: 1px 7px; margin-left: 4px; }
.chx-rank { width: 24px; height: 24px; flex: none; display: grid; place-items: center; border-radius: 8px; font-size: 12px; font-weight: 800; color: var(--forest-3); background: #E5F0E9; }
.chx-rank.r1 { background: linear-gradient(135deg, #F6E3A1, #C79A3A); color: #3E2A05; }
.chx-rank.r2 { background: linear-gradient(135deg, #F1F4F2, #B9C4BE); color: #2C3832; }
.chx-rank.r3 { background: linear-gradient(135deg, #F4D5B8, #B97A45); color: #3A1F08; }
.chx-nm { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--ink); }
.chx-t { font-weight: 700; color: var(--forest); font-variant-numeric: tabular-nums; }
.chx-empty { margin: 0; padding: 14px; border-radius: 12px; background: #F5FAF7; border: 1px dashed #CFE6D8; font-size: 14px; color: var(--muted); }
.chx-sheet { min-width: 0; }

/* Result */
.chx-result { position: relative; overflow: visible; padding: 18px; border-radius: 16px; }
.chx-result.is-solved { background: radial-gradient(400px 160px at 0 0, rgba(196, 241, 104, .35), transparent 70%), linear-gradient(160deg, #EAF8EF, #fff); border: 1px solid #BFE0CC; animation: chxIn .5s var(--ease); }
.chx-result.is-revealed { background: #FFF8E6; border: 1px solid #F1DDA8; }
@keyframes chxIn { from { opacity: 0; transform: translateY(8px) scale(.98); } to { opacity: 1; transform: none; } }
.chx-res-head { display: flex; align-items: center; gap: 12px; }
.chx-res-head h3 { margin: 0 0 2px; font-size: 20px; color: var(--forest); }
.chx-res-head p { margin: 0; font-size: 14px; color: var(--ink-2); }
.chx-res-ico { width: 42px; height: 42px; flex: none; display: grid; place-items: center; border-radius: 50%; font-size: 20px; font-weight: 800; background: var(--excel); color: #fff; box-shadow: 0 0 0 6px rgba(16, 124, 65, .14); }
.is-revealed .chx-res-ico { background: #fff; box-shadow: none; }
.chx-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(80px, 1fr)); gap: 8px; margin: 14px 0 6px; }
.chx-tile { padding: 10px; border-radius: 12px; background: #fff; border: 1px solid #D6E7DC; text-align: center; }
.chx-tile b { display: block; font-size: 19px; color: var(--forest); font-variant-numeric: tabular-nums; }
.chx-tile span { font-size: 11.5px; font-weight: 600; color: var(--muted); }
.chx-tile.is-lime { background: var(--lime); border-color: var(--lime); }
.chx-tile.is-lime span { color: var(--forest); }
.chx-result .small { margin: 8px 0 0; }
.chx-confetti { position: absolute; left: 0; right: 0; top: 30px; height: 0; pointer-events: none; z-index: 5; }
.chx-confetti i { position: absolute; top: 0; width: 8px; height: 12px; border-radius: 2px; opacity: 0; animation: chxConf 1.6s cubic-bezier(.2, .7, .3, 1) forwards; }
@keyframes chxConf { 0% { opacity: 1; transform: translate(0, 0) rotate(0); } 40% { opacity: 1; transform: translate(calc(var(--dx) * .7), var(--dy)) rotate(calc(var(--r) * .5)); } 100% { opacity: 0; transform: translate(var(--dx), 140px) rotate(var(--r)); } }

@media (max-width: 980px) { .chx-top { grid-template-columns: 1fr; align-items: start; } .chx-side { position: static; } .chx-score { max-width: 520px; } }
@media (max-width: 640px) {
  .chx-stats { display: grid; grid-template-columns: 1fr 1fr; }
  .chx-stat { min-width: 0; padding: 12px 14px; }
  .chx-stat b { font-size: 20px; }
  .chx-streak { grid-column: 1 / -1; }
  .chx-pot-num b { font-size: 44px; }
}
@media (prefers-reduced-motion: reduce) { .chx-flame { animation: none; } }

/* ===================================================================== v1.19: "by Creativelair" under the wordmark */
.wm-stack { display: inline-flex; flex-direction: column; justify-content: center; line-height: 1; }
.wm-stack .wm { line-height: 1.05; }
.wm-by { display: block; margin-top: 3px; font-size: 10.5px; font-weight: 500; letter-spacing: .04em; line-height: 1; color: var(--on-dark-2); }
.chx-mission.is-done .task-actions { display: none; }
.chx-result .row-actions { gap: 8px; }
.chx-result .row-actions .btn { padding: 10px 18px; font-size: 14.5px; }
.ft-by { color: var(--lime); font-weight: 600; text-decoration: none; }
.ft-by:hover { text-decoration: underline; color: var(--lime); }

/* ===================================================================== v1.20: final exam */
.ex-head { padding-bottom: clamp(32px, 4vw, 52px); }
.ex-head-in { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 32px; align-items: end; }
.ex-head h1 { margin: 14px 0 8px; }
.ex-lede { margin: 0; max-width: 56ch; color: var(--on-dark-2); font-size: 17px; }
.ex-facts { display: flex; gap: 10px; }
.ex-facts div { min-width: 104px; padding: 14px 16px; border-radius: 16px; background: rgba(255, 255, 255, .07); border: 1px solid rgba(255, 255, 255, .14); text-align: center; }
.ex-facts b { display: block; font-size: 28px; line-height: 1.1; color: var(--lime); }
.ex-facts span { font-size: 13px; color: var(--on-dark-2); }
.ex-body { padding-top: 28px; padding-bottom: 80px; }
.ex-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 24px; align-items: start; }
.ex-card { background: #fff; border: 1px solid #D6E7DC; border-radius: var(--r-card); padding: 24px; box-shadow: 0 20px 40px -32px rgba(6, 42, 28, .45); }
.ex-card h2 { font-size: 22px; color: var(--forest); margin: 0 0 8px; }
.ex-card h3 { font-size: 15px; color: var(--forest); margin: 0 0 10px; }
.ex-side { display: grid; gap: 16px; position: sticky; top: calc(var(--hdr) + 24px); }
.ex-card-pass { text-align: center; background: radial-gradient(500px 200px at 50% 0, rgba(196, 241, 104, .3), transparent 70%), #fff; }
.ex-badge { width: 56px; height: 56px; margin: 0 auto 12px; display: grid; place-items: center; border-radius: 50%; background: var(--excel); color: #fff; font-size: 26px; font-weight: 800; box-shadow: 0 0 0 8px rgba(16, 124, 65, .14); }
.ex-card-lock { text-align: center; }
.ex-lock { width: 56px; height: 56px; margin: 0 auto 12px; display: grid; place-items: center; border-radius: 16px; background: #EEF4F0; color: var(--forest-3); }
.ex-prog { max-width: 420px; margin: 16px auto 18px; text-align: left; }
.ex-prog-top { display: flex; justify-content: space-between; font-size: 14px; margin-bottom: 6px; color: var(--muted); }
.ex-prog-top b { color: var(--forest); }
.ex-card-lock .row-actions { justify-content: center; }
.ex-bar { height: 8px; border-radius: 8px; background: #E5F0E9; overflow: hidden; }
.ex-bar i { display: block; height: 100%; width: 0; border-radius: inherit; background: linear-gradient(90deg, var(--excel), #3FBF78 60%, var(--lime)); transition: width .4s var(--ease); }
.ex-bar.is-low i { background: linear-gradient(90deg, #D97706, #F5B83D); }
.ex-rules { list-style: none; margin: 16px 0 22px; padding: 0; display: grid; gap: 10px; }
.ex-rules li { position: relative; padding: 12px 14px 12px 46px; border-radius: 12px; background: #F5FAF7; border: 1px solid #E0EEE5; }
.ex-rules li::before { content: "✓"; position: absolute; left: 13px; top: 12px; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; background: var(--lime); color: var(--forest); font-size: 12px; font-weight: 800; }
.ex-rules b { display: block; color: var(--forest); }
.ex-rules span { font-size: 14px; color: var(--ink-2); }
.ex-start { display: inline-flex; align-items: center; gap: 10px; }
.ex-topics ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.ex-topics li { padding: 5px 11px; border-radius: 99px; font-size: 13px; font-weight: 600; background: #EEF4F0; color: var(--forest-3); }
.ex-history ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.ex-history a { display: flex; justify-content: space-between; padding: 8px 10px; border-radius: 10px; text-decoration: none; color: var(--ink); background: #F5FAF7; font-size: 14px; }
.ex-history a:hover { background: #EAF5EE; }
.is-pass { color: var(--excel); } .is-fail { color: #B4540A; }

/* Taking the exam */
.ex-head-sm { padding-bottom: 28px; }
.ex-head-sm h1 { font-size: clamp(1.6rem, 3vw, 2.4rem); margin: 12px 0 0; }
.ex-take { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 24px; align-items: start; padding-top: 28px; padding-bottom: 80px; }
.ex-qs { display: grid; gap: 16px; }
.ex-q { margin: 0; min-width: 0; border: 1px solid #D6E7DC; border-radius: var(--r-card); background: #fff; padding: 20px 22px 22px; scroll-margin-top: calc(var(--hdr) + 20px); transition: border-color .25s, box-shadow .25s; }
.ex-q.is-answered { border-color: #A9D8BB; }
.ex-q.is-pop { animation: exPop .35s var(--ease); }
@keyframes exPop { 50% { transform: scale(1.006); box-shadow: 0 0 0 4px rgba(196, 241, 104, .35); } }
.ex-q-head { display: flex; align-items: center; gap: 10px; padding: 0; margin-bottom: 10px; }
.ex-num { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 9px; background: var(--forest); color: var(--lime); font-size: 14px; font-weight: 800; }
.ex-q.is-answered .ex-num { background: var(--excel); color: #fff; }
.ex-cat { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--forest-3); background: #EEF4F0; padding: 3px 9px; border-radius: 99px; }
.ex-prompt { font-size: 17px; line-height: 1.55; color: var(--ink); margin: 0 0 14px; }
.ex-prompt code.f, .ex-otext code.f, .ex-review code.f, .ex-why code.f { font-family: var(--mono); font-size: .92em; background: #F1F6F3; border: 1px solid #DCEBE1; border-radius: 6px; padding: 1px 6px; color: var(--forest); white-space: nowrap; }
.ex-opts { display: grid; gap: 8px; }
.ex-opt { position: relative; display: flex; align-items: center; gap: 12px; padding: 12px 14px; border: 1.5px solid #DCEBE1; border-radius: 12px; cursor: pointer; transition: border-color .2s, background .2s, transform .15s; }
.ex-opt:hover { border-color: #A9D8BB; background: #F7FCF9; }
.ex-opt input { position: absolute; opacity: 0; pointer-events: none; }
.ex-letter { width: 28px; height: 28px; flex: none; display: grid; place-items: center; border-radius: 8px; background: #EEF4F0; color: var(--forest-3); font-size: 13px; font-weight: 800; transition: background .2s, color .2s; }
.ex-otext { font-size: 15.5px; color: var(--ink); }
.ex-opt:has(input:checked) { border-color: var(--excel); background: #F1FAF4; box-shadow: 0 0 0 3px rgba(16, 124, 65, .1); }
.ex-opt:has(input:checked) .ex-letter { background: var(--excel); color: #fff; }
.ex-opt:has(input:focus-visible) { outline: 3px solid rgba(16, 124, 65, .35); outline-offset: 2px; }
.ex-finish { padding: 22px; border-radius: var(--r-card); background: radial-gradient(500px 160px at 0 0, rgba(196, 241, 104, .25), transparent 70%), #F3F9F5; border: 1px dashed #BFE0CC; text-align: center; }
.ex-finish p { margin: 0 0 12px; color: var(--ink-2); }
.ex-nav { position: sticky; top: calc(var(--hdr) + 20px); display: grid; gap: 14px; padding: 18px; border-radius: var(--r-card); background: var(--forest); color: #fff; box-shadow: 0 30px 60px -34px rgba(6, 42, 28, .8); }
.ex-timer { display: flex; align-items: baseline; justify-content: space-between; }
.ex-t-lbl { font-size: 12px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--on-dark-2); }
.ex-timer b { font-size: 30px; font-variant-numeric: tabular-nums; color: var(--lime); }
.ex-timer.is-low b { color: #FFB547; animation: exBlink 1s steps(2) infinite; }
.ex-timer.is-up b { font-size: 20px; animation: none; }
@keyframes exBlink { 50% { opacity: .55; } }
.ex-answered span { font-size: 14px; color: var(--on-dark-2); }
.ex-answered b { color: #fff; }
.ex-answered .ex-bar { margin-top: 6px; background: rgba(255, 255, 255, .12); }
.ex-dots { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.ex-dots a { height: 32px; display: grid; place-items: center; border-radius: 8px; font-size: 13px; font-weight: 700; text-decoration: none; color: var(--on-dark-2); background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .1); }
.ex-dots a.is-done { background: var(--lime); color: var(--forest); border-color: var(--lime); }
.ex-dots a.is-here { box-shadow: 0 0 0 2px #fff; }
.ex-nav .btn-primary { background: var(--lime); color: var(--forest); }

/* Result */
.ex-res-head { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: clamp(24px, 4vw, 48px); align-items: center; }
.ex-res-head h1 { margin: 12px 0 8px; }
.ex-res-head .row-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.ex-ring { position: relative; width: 190px; height: 190px; border-radius: 50%; display: grid; place-items: center; background: conic-gradient(var(--ring-c, var(--lime)) calc(var(--p) * 1%), rgba(255, 255, 255, .1) 0); }
.ex-ring.is-fail { --ring-c: #FFB547; }
.ex-ring > .ex-ring-in { width: 150px; height: 150px; border-radius: 50%; display: grid; place-content: center; text-align: center; background: var(--forest); }
.ex-ring b { font-size: 44px; line-height: 1; color: #fff; }
.ex-ring span { font-size: 14px; color: var(--on-dark-2); margin-top: 4px; }
.ex-review-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.ex-review { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.ex-review li { padding: 14px 16px; border-radius: 14px; border: 1px solid #DCEBE1; }
.ex-review li.is-right { border-color: #CFE6D8; }
.ex-review li.is-wrong { border-color: #F3D2C6; background: #FFFBF8; }
.ex-rv-top { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.ex-mark { width: 22px; height: 22px; display: grid; place-items: center; border-radius: 50%; font-size: 12px; font-weight: 800; color: #fff; background: var(--excel); }
.is-wrong .ex-mark { background: #E4572E; }
.ex-review .ex-prompt { font-size: 15.5px; margin-bottom: 6px; }
.ex-yours, .ex-correct { margin: 0; font-size: 14.5px; }
.ex-yours span, .ex-correct span { font-weight: 700; color: var(--muted); }
.ex-correct { color: var(--excel); margin-top: 2px; }
.ex-why { margin: 8px 0 0; padding: 10px 12px; border-radius: 10px; background: #F3F9F5; font-size: 14px; color: var(--ink-2); }
.ex-cat-row + .ex-cat-row { margin-top: 12px; }
.ex-cat-top { display: flex; justify-content: space-between; font-size: 14px; margin-bottom: 5px; }
.ex-cat-top b { color: var(--forest); }

/* Certificate preview bar */
.cert-preview-bar { background: #FFF8E6; border-color: #F1DDA8; }
.cp-form { display: flex; gap: 6px; }
.cp-form input { width: 180px; padding: 7px 10px; border: 1px solid #D6E7DC; border-radius: 10px; font: inherit; font-size: 14px; }

@media (max-width: 980px) {
  .ex-head-in, .ex-grid { grid-template-columns: 1fr; }
  .ex-side { position: static; }
  .ex-take { grid-template-columns: 1fr; }
  .ex-take .ex-nav { order: -1; top: calc(var(--hdr) + 8px); z-index: 5; grid-template-columns: auto 1fr auto; align-items: center; padding: 12px 14px; gap: 12px; }
  .ex-take .ex-dots { display: none; }
  .ex-take .ex-timer { flex-direction: column; gap: 0; }
  .ex-take .ex-timer b { font-size: 22px; }
  .ex-take .ex-nav .btn-block { width: auto; padding: 9px 16px; }
}
@media (max-width: 640px) {
  .ex-facts { width: 100%; } .ex-facts div { flex: 1; min-width: 0; padding: 12px 8px; } .ex-facts b { font-size: 22px; }
  .ex-res-head { grid-template-columns: 1fr; justify-items: start; }
  .ex-ring { width: 150px; height: 150px; } .ex-ring > .ex-ring-in { width: 118px; height: 118px; } .ex-ring b { font-size: 34px; }
  .cert-preview-bar { flex-wrap: wrap; } .cp-form { width: 100%; } .cp-form input { flex: 1; width: auto; }
}
.ex-prompt code.f, .ex-otext code.f, .ex-review code.f, .ex-why code.f { white-space: normal; overflow-wrap: anywhere; }
.ex-otext, .ex-prompt, .ex-review li { min-width: 0; overflow-wrap: anywhere; }
.ex-head .btn-lime, .ex-head .btn-lime:hover { color: var(--forest); }
.ex-head .btn-glass, .ex-head .btn-glass:hover { color: #fff; }
.ex-ring .chx-confetti { left: 50%; right: auto; width: 0; }

/* ===================================================================== v1.21: social sign-in */
.social-btns { display: grid; gap: 8px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.social-btns.n1 { grid-template-columns: 1fr; } .social-btns.n2 { grid-template-columns: 1fr 1fr; }
.btn-social { display: flex; align-items: center; justify-content: center; gap: 8px; height: 46px; padding: 0 10px; border-radius: 12px; border: 1px solid #D3DED8; background: #fff; color: #1F2A24; font-weight: 600; font-size: 14.5px; text-decoration: none; white-space: nowrap; transition: background .2s, border-color .2s, box-shadow .2s; }
.btn-social:hover { background: #F6FAF8; border-color: #B9CCC0; color: #1F2A24; box-shadow: 0 6px 16px -10px rgba(6, 42, 28, .35); }
.btn-social svg { flex: none; width: 18px; height: 18px; }
.social-or { display: flex; align-items: center; gap: 12px; margin: 20px 0 14px; color: var(--muted); font-size: 13.5px; }
.social-or::before, .social-or::after { content: ""; flex: 1; height: 1px; background: var(--grid); }
@media (max-width: 480px) { .social-btns:not(.n1) .btn-social { flex-direction: column; gap: 4px; height: 62px; padding: 0 4px; font-size: 13px; } .social-btns:not(.n1) .btn-social svg { width: 20px; height: 20px; } }
.conn-list { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 8px; }
.conn-list li { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border: 1px solid var(--grid); border-radius: 12px; }
.conn-ico { width: 34px; height: 34px; flex: none; display: grid; place-items: center; border-radius: 10px; background: #F5F8F6; }
.conn-txt { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.conn-txt small { color: var(--muted); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conn-list form { margin: 0; }

/* ===================================================================== v1.22: final exam card in the curriculum */
.l-card.l-exam .lc-cover { --c1: #3D2B06; --c2: #A9822F; }
.l-card.l-exam .lc-cover::after { content: ""; position: absolute; right: -26px; bottom: -34px; width: 120px; height: 120px; border-radius: 50%; border: 10px solid rgba(255, 236, 170, .18); box-shadow: inset 0 0 0 10px rgba(255, 236, 170, .08); }
.l-card.l-exam { border-color: #E3D3A6; }
.l-card.l-exam .lc-body { background: linear-gradient(180deg, #FBF7EC, #fff 70%); }
.l-card.l-exam.is-done .lc-cover { --c1: #3D2B06; --c2: #A9822F; }
.lc-badge.lock { background: rgba(0, 0, 0, .28); color: #FFF3D1; display: inline-flex; align-items: center; gap: 5px; }
.lc-link { margin-left: auto; font-size: 13.5px; font-weight: 700; color: #7A5A17; text-decoration: none; }
.lc-link:hover { color: var(--excel); text-decoration: underline; }

/* ===================================================================== v1.23: leaner "In plain words" cards */
.fx-again { margin: 10px 0 0 42px; font-size: 14px; color: var(--muted); }
.fx-again code { font-family: var(--mono); font-size: 12.5px; background: #fff; border: 1px solid #DCEBE1; border-radius: 6px; padding: 1px 6px; color: var(--forest); margin: 0 1px; }
.fx-parts dt code + code { margin-left: 4px; }
@media (max-width: 560px) { .fx-again { margin-left: 0; } }

/* ===================================================================== v1.24: readable highlight while the narrator reads */
/* Formula bars keep their dark background; a lime outline shows they're being read */
.lesson-text pre.f.is-reading { background: var(--ink); color: #fff; border-radius: var(--r-sm); box-shadow: 0 0 0 3px var(--lime), 0 0 0 8px rgba(196, 241, 104, .28); position: relative; z-index: 1; }
/* "In plain words" cards: outline instead of a wash, so their text stays crisp */
.lesson-text .fx-card.is-reading { background: #EEF8F1; box-shadow: inset 0 0 0 2px var(--lime), 0 10px 24px -18px rgba(6, 42, 28, .35); border-radius: 0 0 14px 14px; }