/* CrunchWiser SEO Certification
   Brand tokens taken from crunchwiser.com (Oct 2026): Open Sans, ink #0a0a0a,
   muted slate #64748b, hairline #e2e8f0, accent #38b6ff, 6px radius, flat surfaces.
   Accessibility note: white text on #38b6ff fails WCAG AA (2.3:1), so accent buttons
   use ink text, and links use the darker #0b6fa8 (5.3:1). */

@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --cw-blue: #38b6ff;
  --cw-blue-ink: #0b6fa8;
  --cw-blue-tint: #eaf6ff;
  --cw-ink: #0a0a0a;
  --cw-text: #1e293b;
  --cw-muted: #64748b;
  --cw-line: #e2e8f0;
  --cw-soft: #f8fafc;
  --cw-bg: #ffffff;
  --cw-ok: #15803d;
  --cw-ok-tint: #ecfdf3;
  --cw-bad: #b91c1c;
  --cw-bad-tint: #fef2f2;
  --cw-warn: #a16207;
  --cw-warn-tint: #fefce8;
  --radius: 6px;
  --radius-lg: 10px;
  --wrap: 1120px;
  --font: "Open Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 400 15px/1.7 var(--font); color: var(--cw-text); background: var(--cw-bg); }
img { max-width: 100%; height: auto; }
a { color: var(--cw-blue-ink); text-underline-offset: 2px; }
a:hover { color: var(--cw-ink); }
h1, h2, h3, h4 { color: var(--cw-ink); line-height: 1.2; margin: 0 0 .6em; letter-spacing: -.01em; }
h1 { font-size: clamp(30px, 5vw, 48px); font-weight: 800; letter-spacing: -.02em; }
h2 { font-size: clamp(22px, 3vw, 30px); font-weight: 800; }
h3 { font-size: 17px; font-weight: 700; }
p { margin: 0 0 1em; }
small, .small { font-size: 13px; }
.muted { color: var(--cw-muted); }
.mono { font-family: var(--mono); font-size: .92em; }
.nowrap { white-space: nowrap; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
:focus-visible { outline: 3px solid var(--cw-blue); outline-offset: 2px; border-radius: 3px; }
.skip-link { position: absolute; left: 12px; top: -60px; background: var(--cw-ink); color: #fff; padding: 8px 14px; border-radius: var(--radius); z-index: 100; }
.skip-link:focus { top: 12px; color: #fff; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.section { padding: 64px 0; }
.section-tight { padding: 40px 0; }
.section-soft { background: var(--cw-soft); border-top: 1px solid var(--cw-line); border-bottom: 1px solid var(--cw-line); }
.stack > * + * { margin-top: 16px; }
.row { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.row-between { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; justify-content: space-between; }
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* Header: mirrors crunchwiser.com (68px bar, translucent white, hairline bottom) */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--cw-line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--cw-ink); }
.brand img { height: 36px; width: auto; display: block; }
.brand-tag { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--cw-blue-ink); border-left: 1px solid var(--cw-line); padding-left: 10px; }
.wordmark { font-weight: 800; font-size: 20px; letter-spacing: -.02em; }
.wordmark span { color: var(--cw-blue); }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a { color: var(--cw-muted); font-size: 13.6px; font-weight: 500; text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--cw-ink); }
.nav-toggle { display: none; background: none; border: 1px solid var(--cw-line); border-radius: var(--radius); padding: 7px 10px; font: inherit; font-size: 13px; color: var(--cw-ink); cursor: pointer; }
@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .nav { display: none; position: absolute; top: 68px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--cw-line);
         flex-direction: column; align-items: stretch; gap: 0; padding: 8px 24px 16px; }
  .nav.open { display: flex; }
  .nav a { padding: 12px 0; border-bottom: 1px solid var(--cw-line); font-size: 15px; }
  .nav .btn { margin-top: 12px; justify-content: center; }
  .brand-tag { display: none; }
}

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; border-radius: var(--radius); border: 1px solid transparent; padding: 10px 20px;
       font: 600 14px/1.3 var(--font); text-decoration: none; cursor: pointer; transition: background .15s, border-color .15s, color .15s; }
.btn-primary { background: var(--cw-ink); color: #fff; }
.btn-primary:hover { background: #262626; color: #fff; }
.btn-accent { background: var(--cw-blue); color: var(--cw-ink); }
.btn-accent:hover { background: #22a6f2; color: var(--cw-ink); }
.btn-outline { background: #fff; color: var(--cw-ink); border-color: var(--cw-line); }
.btn-outline:hover { border-color: var(--cw-ink); color: var(--cw-ink); }
.btn-danger { background: var(--cw-bad); color: #fff; }
.btn-link { background: none; border: 0; padding: 0; color: var(--cw-blue-ink); text-decoration: underline; font-weight: 500; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 13px 26px; font-size: 15px; }
.btn[disabled], .btn.disabled { opacity: .45; pointer-events: none; }
.btn-block { width: 100%; justify-content: center; }

/* Pills, badges */
.eyebrow { display: inline-flex; align-items: center; gap: 8px; background: var(--cw-blue-tint); color: var(--cw-blue-ink); font-size: 11.5px; font-weight: 700;
           letter-spacing: .1em; text-transform: uppercase; padding: 6px 14px; border-radius: 999px; }
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--cw-blue); }
.badge { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 9px; border-radius: 999px; background: var(--cw-soft); border: 1px solid var(--cw-line); color: var(--cw-text); }
.badge-ok { background: var(--cw-ok-tint); border-color: #bbf7d0; color: var(--cw-ok); }
.badge-bad { background: var(--cw-bad-tint); border-color: #fecaca; color: var(--cw-bad); }
.badge-warn { background: var(--cw-warn-tint); border-color: #fde68a; color: var(--cw-warn); }
.badge-blue { background: var(--cw-blue-tint); border-color: #bae6fd; color: var(--cw-blue-ink); }

/* Cards */
.card { background: #fff; border: 1px solid var(--cw-line); border-radius: var(--radius-lg); padding: 24px; }
.card-soft { background: var(--cw-soft); }
.card h3 { margin-bottom: 6px; }
.card-level { display: flex; flex-direction: column; gap: 14px; position: relative; }
.card-level .level-top { display: flex; justify-content: space-between; align-items: center; }
.card-level .facts { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--cw-line); }
.card-level .facts li { display: flex; justify-content: space-between; padding: 9px 0; border-bottom: 1px solid var(--cw-line); font-size: 14px; }
.card-level .facts li span:first-child { color: var(--cw-muted); }
.card-level .btn { margin-top: auto; justify-content: center; }
.card-level.featured { border-color: var(--cw-blue); box-shadow: 0 0 0 1px var(--cw-blue) inset; }

/* Hero */
.hero { padding: 72px 0 56px; text-align: center; background: linear-gradient(180deg, #f3f9fe 0%, #fff 100%); }
.hero h1 { max-width: 820px; margin: 18px auto 16px; }
.hero h1 em { font-style: normal; color: var(--cw-blue); }
.hero p.lead { max-width: 600px; margin: 0 auto 28px; font-size: 17.6px; color: var(--cw-muted); line-height: 1.75; }
.hero .row { justify-content: center; }
.notice-google { font-size: 13px; color: var(--cw-muted); margin-top: 20px; }

.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.steps li { counter-increment: step; padding: 20px; border: 1px solid var(--cw-line); border-radius: var(--radius-lg); background: #fff; }
.steps li::before { content: counter(step, decimal-leading-zero); display: block; font-weight: 800; color: var(--cw-blue); font-size: 13px; letter-spacing: .08em; margin-bottom: 8px; }

.faq details { border-bottom: 1px solid var(--cw-line); padding: 16px 0; }
.faq summary { cursor: pointer; font-weight: 600; color: var(--cw-ink); list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::after { content: "+"; color: var(--cw-muted); font-weight: 400; font-size: 20px; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 10px 0 0; color: var(--cw-muted); }

.cert-preview { display: block; border: 1px solid var(--cw-line); border-radius: var(--radius-lg); padding: 28px; background: #fff; position: relative; overflow: hidden; }
.cert-preview::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 5px; background: var(--cw-blue); }
.cert-preview .cp-label { font-size: 11px; letter-spacing: .12em; font-weight: 700; color: var(--cw-blue-ink); text-transform: uppercase; }
.cert-preview .cp-name { font-size: 28px; font-weight: 800; color: var(--cw-ink); margin: 10px 0 4px; }
.cert-preview .cp-meta { display: flex; gap: 28px; flex-wrap: wrap; margin-top: 18px; font-size: 13px; }
.cert-preview .cp-meta b { display: block; font-size: 10.5px; letter-spacing: .1em; color: var(--cw-muted); text-transform: uppercase; }

/* Forms */
.form { display: grid; gap: 18px; }
.field label, .label { display: block; font-weight: 600; font-size: 14px; color: var(--cw-ink); margin-bottom: 6px; }
.field .hint { font-size: 13px; color: var(--cw-muted); margin-top: 4px; }
.input, .select, .textarea { width: 100%; font: inherit; font-size: 15px; color: var(--cw-ink); background: #fff; border: 1px solid #cbd5e1; border-radius: var(--radius);
  padding: 10px 12px; transition: border-color .15s, box-shadow .15s; }
.input:focus, .select:focus, .textarea:focus { outline: none; border-color: var(--cw-blue-ink); box-shadow: 0 0 0 3px rgba(56,182,255,.3); }
.textarea { min-height: 110px; resize: vertical; }
.textarea.code { font-family: var(--mono); font-size: 13px; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; }
.check input { margin-top: 4px; width: 17px; height: 17px; accent-color: var(--cw-ink); }
.field-error { color: var(--cw-bad); font-size: 13px; margin-top: 4px; }

/* Alerts */
.alert { border: 1px solid var(--cw-line); border-left-width: 4px; border-radius: var(--radius); padding: 12px 16px; background: #fff; margin-bottom: 16px; }
.alert-success { border-left-color: var(--cw-ok); background: var(--cw-ok-tint); }
.alert-error { border-left-color: var(--cw-bad); background: var(--cw-bad-tint); }
.alert-info { border-left-color: var(--cw-blue); background: var(--cw-blue-tint); }
.alert-warn { border-left-color: var(--cw-warn); background: var(--cw-warn-tint); }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--cw-line); border-radius: var(--radius-lg); background: #fff; }
table.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--cw-line); vertical-align: top; }
.table th { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--cw-muted); font-weight: 700; background: var(--cw-soft); white-space: nowrap; }
.table tr:last-child td { border-bottom: 0; }
.table td.num, .table th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* Progress bars */
.bar { height: 8px; background: #eef2f7; border-radius: 999px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--cw-blue); border-radius: 999px; }
.bar.ok > span { background: var(--cw-ok); }
.bar.bad > span { background: #f87171; }
.topic-row { display: grid; grid-template-columns: minmax(140px, 1.4fr) 2fr 70px; gap: 14px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--cw-line); font-size: 14px; }
.topic-row .pct { text-align: right; font-weight: 700; font-variant-numeric: tabular-nums; }

/* Exam */
.exam-header { border-bottom: 1px solid var(--cw-line); background: #fff; position: sticky; top: 0; z-index: 40; }
.exam-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.timer { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 15px; color: var(--cw-ink); background: var(--cw-soft); border: 1px solid var(--cw-line);
         padding: 6px 12px; border-radius: var(--radius); }
.timer.low { color: var(--cw-bad); border-color: #fecaca; background: var(--cw-bad-tint); }
.exam { max-width: 760px; margin: 0 auto; padding: 32px 24px 80px; }
.exam-progress { display: flex; justify-content: space-between; font-size: 13px; color: var(--cw-muted); margin-bottom: 8px; }
.exam-progress strong { color: var(--cw-ink); }
.question-stem { font-size: 19px; font-weight: 600; color: var(--cw-ink); line-height: 1.5; margin: 22px 0 8px; }
.scenario { background: var(--cw-soft); border: 1px solid var(--cw-line); border-radius: var(--radius); padding: 14px 16px; font-size: 14.5px; margin: 16px 0; }
pre.code { background: #0f172a; color: #e2e8f0; padding: 14px 16px; border-radius: var(--radius); overflow-x: auto; font: 13px/1.6 var(--mono); }
.select-hint { font-size: 13px; color: var(--cw-blue-ink); font-weight: 600; margin-bottom: 14px; }
.options { display: grid; gap: 10px; margin: 0; padding: 0; border: 0; }
.option { display: flex; gap: 14px; align-items: flex-start; border: 1px solid var(--cw-line); border-radius: var(--radius-lg); padding: 14px 16px; cursor: pointer;
          background: #fff; transition: border-color .12s, background .12s; }
.option:hover { border-color: #94a3b8; }
.option input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.option .key { flex: 0 0 28px; height: 28px; border-radius: 6px; border: 1px solid var(--cw-line); display: grid; place-items: center; font-weight: 700; font-size: 13px; color: var(--cw-muted); background: var(--cw-soft); }
.option:has(input:checked) { border-color: var(--cw-ink); background: #fafafa; }
.option:has(input:checked) .key { background: var(--cw-ink); color: #fff; border-color: var(--cw-ink); }
.option:has(input:focus-visible) { outline: 3px solid var(--cw-blue); outline-offset: 2px; }
.exam-actions { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.mark-review { display: inline-flex; gap: 8px; align-items: center; font-size: 14px; color: var(--cw-text); }
.navigator { display: grid; grid-template-columns: repeat(auto-fill, minmax(40px, 1fr)); gap: 6px; margin-top: 12px; }
.navigator > a, .navigator > button { font-family: inherit; cursor: pointer; padding: 0; display: grid; place-items: center; height: 38px; border: 1px solid var(--cw-line); border-radius: 6px; text-decoration: none; font-size: 13px; font-weight: 600; color: var(--cw-muted); position: relative; background: #fff; }
.navigator .answered { background: var(--cw-blue-tint); border-color: #bae6fd; color: var(--cw-ink); }
.navigator .marked::after { content: ""; position: absolute; top: 3px; right: 3px; width: 7px; height: 7px; border-radius: 50%; background: #f59e0b; }
.navigator .current { border-color: var(--cw-ink); color: var(--cw-ink); box-shadow: 0 0 0 1px var(--cw-ink) inset; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 12.5px; color: var(--cw-muted); margin-top: 10px; }
.legend i { display: inline-block; width: 11px; height: 11px; border-radius: 3px; vertical-align: -1px; margin-right: 5px; border: 1px solid var(--cw-line); }
.legend .l-ans { background: var(--cw-blue-tint); border-color: #bae6fd; }
.legend .l-mark { background: #f59e0b; border-radius: 50%; border: 0; }
.save-status { font-size: 12.5px; color: var(--cw-muted); min-height: 18px; }
dialog.modal { border: 1px solid var(--cw-line); border-radius: var(--radius-lg); padding: 24px; max-width: 460px; width: calc(100% - 32px); }
dialog.modal::backdrop { background: rgba(15,23,42,.45); }

/* Results */
.score-hero { display: grid; grid-template-columns: auto 1fr; gap: 28px; align-items: center; }
.score-ring { width: 140px; height: 140px; border-radius: 50%; display: grid; place-items: center; text-align: center;
              background: conic-gradient(var(--ring, var(--cw-blue)) calc(var(--p) * 1%), #eef2f7 0); }
.score-ring > div { width: 112px; height: 112px; border-radius: 50%; background: #fff; display: grid; place-items: center; }
.score-ring strong { font-size: 28px; color: var(--cw-ink); display: block; line-height: 1; }
.score-ring span { font-size: 12px; color: var(--cw-muted); }
@media (max-width: 560px) { .score-hero { grid-template-columns: 1fr; justify-items: start; } }
.review-item { border: 1px solid var(--cw-line); border-radius: var(--radius-lg); padding: 20px; margin-bottom: 14px; }
.review-item.correct { border-left: 4px solid var(--cw-ok); }
.review-item.incorrect { border-left: 4px solid var(--cw-bad); }
.review-opt { padding: 8px 12px; border-radius: var(--radius); margin: 6px 0; font-size: 14px; border: 1px solid transparent; }
.review-opt.is-correct { background: var(--cw-ok-tint); border-color: #bbf7d0; }
.review-opt.is-wrong { background: var(--cw-bad-tint); border-color: #fecaca; }
.review-opt .why { display: block; color: var(--cw-muted); font-size: 13px; margin-top: 3px; }
.explanation { background: var(--cw-soft); border-radius: var(--radius); padding: 14px 16px; margin-top: 12px; font-size: 14.5px; }
.share-box { display: flex; gap: 8px; }
.share-box .input { font-family: var(--mono); font-size: 13px; }

/* Verification */
.verify-card { border: 1px solid var(--cw-line); border-radius: var(--radius-lg); overflow: hidden; }
.verify-status { padding: 16px 24px; font-weight: 700; display: flex; gap: 10px; align-items: center; }
.verify-status.valid { background: var(--cw-ok-tint); color: var(--cw-ok); }
.verify-status.revoked, .verify-status.expired { background: var(--cw-bad-tint); color: var(--cw-bad); }
.verify-body { padding: 24px; }
dl.kv { display: grid; grid-template-columns: 170px 1fr; gap: 10px 20px; margin: 0; font-size: 14.5px; }
dl.kv dt { color: var(--cw-muted); }
dl.kv dd { margin: 0; color: var(--cw-ink); font-weight: 600; }
@media (max-width: 560px) { dl.kv { grid-template-columns: 1fr; gap: 2px; } dl.kv dd { margin-bottom: 10px; } }

/* Footer: mirrors crunchwiser.com (white, hairline top, muted links) */
.site-footer { border-top: 1px solid var(--cw-line); padding: 40px 0; margin-top: 40px; font-size: 13.5px; color: var(--cw-muted); }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.site-footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
.site-footer a { color: var(--cw-muted); text-decoration: none; }
.site-footer a:hover { color: var(--cw-ink); }

/* Admin */
.admin { display: grid; grid-template-columns: 230px 1fr; min-height: 100vh; }
.admin-side { border-right: 1px solid var(--cw-line); padding: 20px 14px; background: var(--cw-soft); position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.admin-side .brand { margin: 0 8px 22px; }
.admin-side nav a { display: block; padding: 7px 10px; border-radius: var(--radius); color: var(--cw-text); text-decoration: none; font-size: 14px; }
.admin-side nav a:hover { background: #eef2f7; }
.admin-side nav a.active { background: #fff; border: 1px solid var(--cw-line); font-weight: 600; color: var(--cw-ink); }
.admin-side .nav-group { font-size: 11px; text-transform: uppercase; letter-spacing: .1em; color: var(--cw-muted); font-weight: 700; margin: 18px 10px 6px; }
.admin-main { padding: 28px 32px 60px; min-width: 0; }
.admin-main h1 { font-size: 26px; }
.stat { border: 1px solid var(--cw-line); border-radius: var(--radius-lg); padding: 16px 18px; background: #fff; }
.stat b { display: block; font-size: 26px; color: var(--cw-ink); font-variant-numeric: tabular-nums; line-height: 1.2; }
.stat span { font-size: 13px; color: var(--cw-muted); }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 16px; }
.filters .input, .filters .select { width: auto; min-width: 150px; padding: 8px 10px; font-size: 14px; }
.pagination { display: flex; gap: 6px; margin-top: 14px; flex-wrap: wrap; }
.pagination a, .pagination span { padding: 5px 11px; border: 1px solid var(--cw-line); border-radius: var(--radius); font-size: 13px; text-decoration: none; }
.pagination .current { background: var(--cw-ink); color: #fff; border-color: var(--cw-ink); }
.option-editor { border: 1px solid var(--cw-line); border-radius: var(--radius); padding: 12px; display: grid; gap: 8px; background: #fff; }
.diff-old { background: var(--cw-bad-tint); }
.diff-new { background: var(--cw-ok-tint); }
@media (max-width: 900px) {
  .admin { grid-template-columns: 1fr; }
  .admin-side { position: static; height: auto; }
  .admin-main { padding: 20px; }
}

@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
@media print {
  .site-header, .site-footer, .no-print, .exam-header { display: none !important; }
  body { font-size: 12px; }
}

/* Buttons inside the nav keep button colours */
.nav a.btn { color: var(--cw-ink); padding: 8px 16px; font-weight: 600; }
.nav a.btn-primary { color: #fff; }
@media (max-width: 820px) { .nav a.btn { border-bottom: 0; } }

/* ---------------------------------------------------------------- learning modules */
.text-ok { color: var(--cw-ok); }
.breadcrumbs { color: var(--cw-muted); margin-bottom: 14px; }
.breadcrumbs a { color: var(--cw-muted); }
.breadcrumbs a:hover { color: var(--cw-ink); }
.progress { height: 8px; background: var(--cw-line); border-radius: 999px; overflow: hidden; }
.progress span { display: block; height: 100%; background: var(--cw-ok); border-radius: 999px; }
.hero-learn .lead { margin-bottom: 12px; }

.module-list { list-style: none; margin: 0; padding: 0; counter-reset: none; }
.module-item { display: grid; grid-template-columns: 40px 1fr; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--cw-line); }
.module-item:first-child { border-top: 1px solid var(--cw-line); }
.module-num { width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; font-size: 14px; background: var(--cw-blue-tint); color: var(--cw-blue-ink); }
.module-item.is-done .module-num { background: var(--cw-ok-tint); color: var(--cw-ok); }
.module-title { font-size: 17px; margin: 4px 0 4px; }
.module-title a { color: var(--cw-ink); text-decoration: none; }
.module-title a:hover { text-decoration: underline; }
.module-meta { margin: 6px 0 0; color: var(--cw-muted); }

.lesson-head { padding: 36px 0 28px; background: #f3f9fe; border-bottom: 1px solid var(--cw-line); }
.lesson-head h1 { font-size: clamp(28px, 4.2vw, 42px); max-width: 860px; }
.lesson-head .lead { font-size: 17px; color: var(--cw-muted); line-height: 1.7; }
.lesson-meta { margin: 0; }
.lesson-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 48px; padding-top: 32px; padding-bottom: 56px; }
.lesson-layout > .lesson-body:only-child { grid-column: 1 / -1; max-width: 760px; }
.lesson-toc { position: sticky; top: 20px; align-self: start; font-size: 13.5px; }
.lesson-toc .toc-title { font-weight: 700; color: var(--cw-ink); text-transform: uppercase; letter-spacing: .06em; font-size: 11.5px; margin-bottom: 8px; }
.lesson-toc ol { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--cw-line); }
.lesson-toc li a { display: block; padding: 5px 0 5px 12px; color: var(--cw-muted); text-decoration: none; margin-left: -2px; border-left: 2px solid transparent; line-height: 1.45; }
.lesson-toc li a:hover { color: var(--cw-ink); border-left-color: var(--cw-blue); }
.lesson-body { max-width: 760px; min-width: 0; }
@media (max-width: 900px) {
  .lesson-layout { grid-template-columns: 1fr; gap: 20px; }
  .lesson-toc { position: static; border: 1px solid var(--cw-line); border-radius: var(--radius); padding: 14px 16px; }
}

.prose { font-size: 16.5px; line-height: 1.8; }
.prose h2 { font-size: clamp(21px, 2.6vw, 26px); margin: 2em 0 .6em; scroll-margin-top: 16px; }
.prose h3 { font-size: 18px; margin: 1.6em 0 .5em; scroll-margin-top: 16px; }
.prose h2:first-child { margin-top: 0; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.1em; }
.prose li { margin-bottom: .35em; }
.prose code { font-family: var(--mono); font-size: .86em; background: var(--cw-soft); border: 1px solid var(--cw-line); border-radius: 4px; padding: 1px 5px; overflow-wrap: anywhere; }
.prose blockquote { margin: 1.4em 0; padding: 4px 0 4px 18px; border-left: 3px solid var(--cw-line); color: var(--cw-muted); }
.prose hr { border: 0; border-top: 1px solid var(--cw-line); margin: 2em 0; }
.code-block { position: relative; margin: 1.2em 0 1.4em; }
.code-block pre { margin: 0; background: #0f172a; color: #e2e8f0; border-radius: var(--radius); padding: 16px 18px; overflow-x: auto; font-size: 13.5px; line-height: 1.6; }
.code-block pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; overflow-wrap: normal; }
.code-lang { position: absolute; top: 6px; right: 10px; font-size: 11px; color: #94a3b8; text-transform: uppercase; letter-spacing: .06em; font-family: var(--mono); }
.callout { margin: 1.4em 0; padding: 14px 16px; border-radius: var(--radius); border: 1px solid var(--cw-line); border-left: 4px solid var(--cw-blue); background: var(--cw-blue-tint); font-size: 15.5px; line-height: 1.7; }
.callout-label { display: block; font-size: 11.5px; text-transform: uppercase; letter-spacing: .07em; color: var(--cw-blue-ink); margin-bottom: 2px; }
.callout-warning { border-left-color: var(--cw-warn); background: var(--cw-warn-tint); }
.callout-warning .callout-label { color: var(--cw-warn); }
.callout-myth { border-left-color: var(--cw-bad); background: var(--cw-bad-tint); }
.callout-myth .callout-label { color: var(--cw-bad); }
.callout-example { border-left-color: var(--cw-ink); background: var(--cw-soft); }
.callout-example .callout-label { color: var(--cw-ink); }
.callout-key-idea { border-left-color: var(--cw-ok); background: var(--cw-ok-tint); }
.callout-key-idea .callout-label { color: var(--cw-ok); }
.lesson-table { font-size: 14.5px; }
.lesson-table td, .lesson-table th { vertical-align: top; }

.flow { margin: 1.4em 0 1.6em; }
.flow-row { list-style: none; margin: 0 0 10px; padding: 0; display: flex; flex-wrap: wrap; gap: 28px; }
.flow-step { position: relative; flex: 1 1 140px; min-width: 120px; border: 1px solid var(--cw-line); border-top: 3px solid var(--cw-blue); border-radius: var(--radius); padding: 10px 12px; background: #fff; font-size: 14px; line-height: 1.5; }
.flow-step strong { display: block; color: var(--cw-ink); }
.flow-step span { display: block; color: var(--cw-muted); font-size: 13px; margin-top: 2px; }
.flow-step + .flow-step::before { content: "→"; position: absolute; left: -22px; top: 50%; transform: translateY(-50%); color: var(--cw-blue-ink); font-weight: 700; }
.flow figcaption { font-size: 13px; color: var(--cw-muted); }
@media (max-width: 600px) {
  .flow-row { flex-direction: column; gap: 22px; }
  .flow-step + .flow-step::before { content: "↓"; left: 16px; top: -20px; transform: none; }
}

.practice { margin-top: 48px; padding-top: 8px; border-top: 1px solid var(--cw-line); }
.practice-q { border: 1px solid var(--cw-line); border-radius: var(--radius-lg); padding: 16px 18px; margin: 0 0 14px; }
.practice-q legend { font-weight: 600; color: var(--cw-ink); padding: 0 4px; line-height: 1.5; }
.practice-opt { display: flex; gap: 10px; align-items: flex-start; padding: 9px 10px; border: 1px solid var(--cw-line); border-radius: var(--radius); margin-top: 8px; cursor: pointer; font-size: 15px; line-height: 1.5; }
.practice-opt:hover { border-color: var(--cw-blue); }
.practice-opt input { margin-top: 4px; accent-color: var(--cw-ink); }
.practice-opt.is-correct { border-color: var(--cw-ok); background: var(--cw-ok-tint); }
.practice-opt.is-wrong { border-color: var(--cw-bad); background: var(--cw-bad-tint); }
.practice-q.is-answered .practice-opt { cursor: default; }
.practice-feedback { margin-top: 12px; font-size: 14.5px; line-height: 1.65; }
.practice-feedback .why { color: var(--cw-muted); }
.practice-score { font-weight: 600; color: var(--cw-ink); }
.lesson-complete { margin: 32px 0; }
.source-list { padding-left: 1.2em; }
.source-list li { margin-bottom: 6px; }
.lesson-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 32px; }
.lesson-nav-link { display: flex; flex-direction: column; gap: 4px; text-decoration: none; color: var(--cw-ink); }
.lesson-nav-link:hover { border-color: var(--cw-blue); }
.lesson-nav-link.next { text-align: right; }
@media (max-width: 600px) { .lesson-nav { grid-template-columns: 1fr; } .lesson-nav-link.next { text-align: left; } }
.hero-learn { background: #f3f9fe; border-bottom: 1px solid var(--cw-line); }