:root {
  --navy: #13233f;
  --navy-2: #1d3257;
  --ink: #1b2330;
  --muted: #5b6676;
  --line: #e3e7ee;
  --bg: #f7f8fb;
  --card: #ffffff;
  --surface: #ffffff;
  --accent: #f28c28;
  --accent-dark: #d9731a;
  --ok: #1f8a4c;
  --ok-bg: #e8f6ee;
  --bad: #c0392b;
  --bad-bg: #fcebea;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(19, 35, 63, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}

a { color: var(--navy-2); }

.wrap { max-width: 1080px; margin: 0 auto; padding-inline: 20px; }

/* Header */
.site-header {
  background: var(--navy);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}
.logo {
  font-weight: 800;
  font-size: 19px;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.logo span { color: var(--accent); }
.nav { display: flex; align-items: center; gap: 20px; }
.nav a { color: #d8e0ee; text-decoration: none; font-size: 15px; }
.nav a:hover { color: #fff; }
.lang {
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 14px;
}
.nav .btn.small { white-space: nowrap; }
@media (max-width: 760px) {
  .nav { gap: 10px; }
  .nav .nav-link { display: none; }
}
@media (max-width: 400px) {
  .logo { font-size: 17px; }
  .nav .btn.small { padding: 7px 12px; font-size: 14px; }
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  border: 0;
  border-radius: 10px;
  padding: 14px 24px;
  font-size: 17px;
  cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: var(--accent-dark); }
.btn.small { padding: 8px 16px; font-size: 15px; }
.btn.ghost {
  background: transparent;
  color: var(--navy);
  border: 2px solid var(--line);
}
.btn.ghost:hover { border-color: var(--navy-2); }
.btn[disabled] { opacity: 0.45; cursor: not-allowed; }

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-2) 100%);
  color: #fff;
  padding-block: 56px 72px;
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  background: rgba(242, 140, 40, 0.15);
  color: #ffc58f;
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.12;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.hero p.lead { font-size: 19px; color: #d8e0ee; margin: 0 0 28px; }
.hero .note { font-size: 14px; color: #aebbd2; margin-top: 12px; }
.mock {
  background: var(--surface);
  color: var(--ink);
  border-radius: var(--radius);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  padding: 22px;
}
.mock .meta { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.mock .q { font-weight: 700; margin-bottom: 14px; }
.mock .opt {
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 9px 12px;
  margin-bottom: 8px;
  font-size: 15px;
}
.mock .opt.right { border-color: var(--ok); background: var(--ok-bg); }
.mock .why { font-size: 14px; color: var(--muted); border-left: 3px solid var(--accent); padding-left: 10px; margin-top: 12px; }
@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; }
}

/* Sections */
section { padding-block: 64px; }
section h2 {
  font-size: clamp(26px, 3.6vw, 34px);
  line-height: 1.2;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
section .sub { color: var(--muted); margin: 0 0 36px; max-width: 680px; }
.alt { background: var(--surface); border-block: 1px solid var(--line); }

.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
@media (max-width: 860px) {
  .grid3, .grid2 { grid-template-columns: 1fr; }
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.card h3 { margin: 0 0 8px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); }
.card .big { font-size: 34px; font-weight: 800; color: var(--accent); line-height: 1; margin-bottom: 10px; }

/* Exam sections */
.weights { display: grid; gap: 12px; }
.weight {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 48px;
  gap: 4px 12px;
  align-items: center;
}
.weight .name { font-weight: 600; }
.weight .pct { text-align: right; font-weight: 700; color: var(--navy-2); }
.weight .bar { grid-column: 1 / -1; height: 10px; background: var(--line); border-radius: 999px; overflow: hidden; }
.weight .bar i { display: block; height: 100%; background: var(--accent); border-radius: 999px; }
.src { font-size: 13px; color: var(--muted); margin-top: 18px; }

/* Steps */
.steps { counter-reset: step; }
.step { position: relative; padding-left: 60px; }
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 24px;
  top: 22px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  display: grid;
  place-items: center;
}

/* Pricing */
.price-card { position: relative; display: flex; flex-direction: column; }
.price-card.featured { border: 2px solid var(--accent); }
.badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 999px;
}
.price { font-size: 44px; font-weight: 800; margin: 8px 0 0; }
.price small { font-size: 16px; color: var(--muted); font-weight: 500; }
.price-card ul { padding-left: 20px; margin: 16px 0 24px; color: var(--ink); }
.price-card li { margin-bottom: 6px; }
.price-card .btn { margin-top: auto; text-align: center; }
.guarantee {
  margin-top: 24px;
  background: var(--ok-bg);
  border-radius: var(--radius);
  padding: 16px 20px;
  color: #145c33;
}

/* FAQ */
details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 12px;
}
summary { font-weight: 700; cursor: pointer; }
details p { margin: 10px 0 0; color: var(--muted); }

/* CTA band */
.cta-band { background: var(--navy); color: #fff; text-align: center; }
.cta-band p { color: #d8e0ee; }

/* Footer */
footer {
  padding-block: 32px;
  font-size: 14px;
  color: var(--muted);
}
footer .wrap { display: grid; gap: 8px; }

/* Quiz */
.quiz-page { padding-block: 32px 64px; }
.quiz {
  max-width: 720px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}
@media (max-width: 520px) {
  .quiz { padding: 20px 16px; }
}
.progress { height: 8px; background: var(--line); border-radius: 999px; overflow: hidden; margin-bottom: 18px; }
.progress i { display: block; height: 100%; background: var(--accent); transition: width 0.2s; }
.qmeta { display: flex; justify-content: space-between; gap: 8px; font-size: 14px; color: var(--muted); margin-bottom: 8px; flex-wrap: wrap; }
.qtext { font-size: 20px; font-weight: 700; margin: 0 0 18px; }
.choices { display: grid; gap: 10px; }
.choice {
  text-align: left;
  width: 100%;
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  font: inherit;
  color: inherit;
  cursor: pointer;
  display: flex;
  gap: 12px;
}
.choice:hover:not([disabled]) { border-color: var(--navy-2); }
.choice .letter { font-weight: 800; color: var(--navy-2); min-width: 18px; }
.choice.selected { border-color: var(--navy-2); background: #eef2f9; }
.choice.correct { border-color: var(--ok); background: var(--ok-bg); }
.choice.wrong { border-color: var(--bad); background: var(--bad-bg); }
.choice[disabled] { cursor: default; }
.feedback { margin-top: 18px; border-radius: 12px; padding: 14px 16px; }
.feedback.ok { background: var(--ok-bg); }
.feedback.no { background: var(--bad-bg); }
.feedback strong { display: block; margin-bottom: 4px; }
.feedback .cite { font-size: 13px; color: var(--muted); margin-top: 8px; }
.quiz-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }
.score-big { font-size: 64px; font-weight: 800; line-height: 1; margin: 8px 0; }
.verdict { font-size: 18px; margin-bottom: 24px; }
.result-row { margin-bottom: 14px; }
.result-row .top { display: flex; justify-content: space-between; font-weight: 600; font-size: 15px; }
.result-row .bar { height: 10px; background: var(--line); border-radius: 999px; overflow: hidden; margin-top: 4px; }
.result-row .bar i { display: block; height: 100%; border-radius: 999px; }
.upsell { margin-top: 28px; border-top: 1px solid var(--line); padding-top: 24px; }
.center { text-align: center; }
.muted { color: var(--muted); }

/* App dashboard */
.app-main { padding-block: 32px 64px; }
.app-main h1 { font-size: clamp(26px, 4vw, 34px); margin: 0 0 8px; }
.app-main h2 { font-size: 22px; margin: 32px 0 12px; }
.modes { margin-top: 24px; }
.card.mode { text-decoration: none; color: inherit; display: flex; align-items: center; gap: 14px; transition: border-color .15s, transform .15s; }
.card.mode:hover { border-color: var(--navy-2); transform: translateY(-1px); }
.card.mode h3 { margin: 0; }
.mode-icon { font-size: 26px; color: var(--accent); line-height: 1; }
.link-row { display: block; text-decoration: none; color: inherit; padding: 10px 12px; border-radius: 10px; }
.link-row:hover { background: var(--surface); }
.clock { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--navy-2); }
.quiz-actions.center { justify-content: center; }
.legal { padding-block: 40px 64px; }
.legal .wrap { max-width: 760px; }
.legal h1 { font-size: clamp(28px, 4vw, 36px); margin: 0 0 6px; }
.legal h2 { font-size: 20px; margin: 32px 0 8px; }
.legal p, .legal li { color: var(--ink); }
.legal ul { padding-left: 20px; }
footer .wrap a { color: var(--navy-2); }
.clock.low { color: var(--bad); }

/* Language suggestion bar */
.lang-bar {
  display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap;
  background: #fff5ea; border-bottom: 1px solid #f3d9bb; color: var(--ink);
  padding: 10px 16px; font-size: 15px;
}
.lang-bar-close { background: none; border: 0; color: var(--muted); font: inherit; cursor: pointer; text-decoration: underline; }

.btn.is-busy { opacity: .6; pointer-events: none; }

.mock .src-note { margin-top: 12px; padding-top: 10px; border-top: 1px solid var(--line); justify-content: flex-start; font-size: 12px; }

/* Guide articles */
.crumbs { font-size: 14px; color: var(--muted); padding-block: 20px 0; }
.crumbs a { color: var(--muted); }
.crumbs span { margin-inline: 6px; }

.article { padding-block: 24px 64px; }
.article .wrap { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 48px; align-items: start; }
.article h1 { font-size: 38px; line-height: 1.15; letter-spacing: -0.5px; margin: 0 0 14px; }
.article .standfirst { font-size: 20px; color: var(--muted); margin: 0 0 8px; }
.article .byline { font-size: 14px; color: var(--muted); border-bottom: 1px solid var(--line); padding-bottom: 20px; margin-bottom: 8px; }
.article h2 { font-size: 27px; letter-spacing: -0.3px; margin: 44px 0 12px; scroll-margin-top: 80px; }
.article h3 { font-size: 20px; margin: 28px 0 8px; }
.article p { margin: 0 0 16px; }
.article ul, .article ol { margin: 0 0 18px; padding-left: 22px; }
.article li { margin-bottom: 8px; }
.article table { width: 100%; border-collapse: collapse; margin: 0 0 20px; font-size: 16px; }
.article th, .article td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.article th { background: var(--surface); font-size: 14px; text-transform: uppercase; letter-spacing: 0.4px; color: var(--muted); }
.article td.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.article tr.total td { font-weight: 800; border-top: 2px solid var(--line); }

.callout { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0; padding: 16px 20px; margin: 0 0 22px; }
.callout p:last-child { margin-bottom: 0; }
.callout strong { color: var(--navy); }

.toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; position: sticky; top: 20px; }
.toc h2 { font-size: 14px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--muted); margin: 0 0 10px; }
.toc ol { margin: 0; padding-left: 18px; font-size: 15px; }
.toc li { margin-bottom: 7px; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.aside-cta { background: var(--navy); color: #fff; border-radius: var(--radius); padding: 20px; margin-top: 20px; }
.aside-cta h2 { color: #fff; font-size: 18px; text-transform: none; letter-spacing: 0; margin: 0 0 8px; }
.aside-cta p { font-size: 15px; color: #d8e0ee; margin: 0 0 14px; }
.aside-cta .btn { display: block; text-align: center; }

.next-reads { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 24px; }
.next-reads a { display: block; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; text-decoration: none; }
.next-reads a:hover { border-color: var(--accent); }
.next-reads strong { display: block; color: var(--navy); margin-bottom: 4px; }
.next-reads span { font-size: 15px; color: var(--muted); }

.updated { font-size: 13px; color: var(--muted); margin-top: 36px; border-top: 1px solid var(--line); padding-top: 16px; }

@media (max-width: 900px) {
  .article .wrap { grid-template-columns: 1fr; gap: 28px; }
  .toc { position: static; }
  .article h1 { font-size: 30px; }
  .next-reads { grid-template-columns: 1fr; }
}


/* Results-screen offer */
.upsell .quiz-actions { justify-content: flex-start; margin-top: 18px; }
.upsell .quiz-actions.secondary { margin-top: 14px; }
.upsell .quiz-actions.secondary .btn { padding: 10px 18px; font-size: 15px; }
.upsell-note { font-size: 14px; margin: 10px 0 0; }

/* ------------------------------------------------------------------ *
 * Dark theme
 * The site runs on tokens, so most of this is a second set of values.
 * It follows the operating system: no switch to find, nothing to remember.
 * The navy header, hero and CTA band were already dark and stay as they are.
 * ------------------------------------------------------------------ */
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e7ecf5;
    --muted: #9fabc0;
    --line: #2b3548;
    --bg: #0e1420;
    --card: #161e2d;
    --surface: #161e2d;
    --ok: #3ea96a;
    --ok-bg: #16301f;
    --bad: #e0685a;
    --bad-bg: #331a18;
    --shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
  }

  /* Links: navy is unreadable on a dark page, but the token also paints the
     hero gradient, so recolour the text instead of the token. */
  a,
  footer .wrap a,
  .weight .pct,
  .clock,
  .choice .letter { color: #8fb6ef; }
  .crumbs a { color: var(--muted); }

  .btn.ghost { color: var(--ink); border-color: var(--line); }
  .btn.ghost:hover { border-color: #8fb6ef; }
  .choice:hover:not([disabled]),
  .card.mode:hover { border-color: #8fb6ef; }
  .choice.selected { border-color: #8fb6ef; background: #1c2739; }

  /* Navy on a dark card disappears; these need their own values. */
  .step::before { background: var(--accent); color: #13233f; }
  .guarantee { color: #b7e6c9; }
  .aside-cta { border: 1px solid var(--line); }
  .mock { box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5); }
  .article th { color: var(--muted); }

  .lang-bar { background: #26211a; border-bottom-color: #43382a; }

  /* Screenshots and diagrams, if any are ever added, should not glare. */
  img { opacity: 0.94; }
}