/* Cambridge IGCSE Question Simulator: one stylesheet, no build step. Colours follow the HomiLabs site. */
:root {
  --bg: #f5f1ea;
  --band: #ece6db;
  --surface: #fffdf9;
  --text: #1b1c18;
  --muted: #5d5f57;
  --line: #ddd5c7;
  --accent: #1f6f5c;
  --accent-ink: #ffffff;
  --accent-soft: #dcebe5;
  --gold: #b45309;
  --gold-soft: #fbead2;
  --rare: #6b5b95;
  --rare-soft: #ebe6f5;
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121310;
    --band: #191a16;
    --surface: #20221d;
    --text: #ece8df;
    --muted: #a4a69c;
    --line: #313329;
    --accent: #5cc4a6;
    --accent-ink: #0d1411;
    --accent-soft: #1d332c;
    --gold: #f0b35c;
    --gold-soft: #3a2c17;
    --rare: #c3b4ec;
    --rare-soft: #2b2738;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 76px; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h1, h2 { font-family: Georgia, "Times New Roman", serif; font-weight: 650; letter-spacing: -0.01em; }
h2 { font-size: clamp(22px, 3vw, 28px); margin-top: 1.6em; }
a { color: var(--accent); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 640px) { .wrap { padding: 0 24px; } }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--surface); padding: 8px 12px; z-index: 20; }
.small { font-size: 13px; color: var(--muted); }

/* Header */
.top { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(10px); }
.top-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none;
  font: 650 18px Georgia, serif; }
.nav { display: flex; gap: 2px; flex-wrap: wrap; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 500; font-size: 15px; padding: 6px 10px; border-radius: 8px; }
.nav a:hover { color: var(--text); background: var(--band); }
@media (max-width: 560px) { .brand span { font-size: 16px; } .nav a { padding: 4px 6px; font-size: 14px; } .top-row { padding-block: 8px; } }

/* Breadcrumbs */
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 18px 0 0; font-size: 14px; color: var(--muted); }
.crumbs li + li::before { content: "›"; margin-right: 6px; }
.crumbs a { color: var(--muted); }
.crumbs li:last-child a { color: var(--text); text-decoration: none; }

/* Hero and page heads */
.hero { padding: 56px 0 24px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 13px; letter-spacing: .06em; text-transform: uppercase; margin: 0 0 12px; }
.hero h1 { font-size: clamp(32px, 6vw, 54px); max-width: 18ch; }
.page-head { padding: 24px 0 8px; }
.page-head h1 { font-size: clamp(28px, 5vw, 42px); }
.lede { font-size: clamp(17px, 2.2vw, 19px); color: var(--muted); max-width: 62ch; }
.stats { list-style: none; display: flex; flex-wrap: wrap; gap: 12px; padding: 0; margin: 24px 0 0; }
.stats li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 16px; color: var(--muted); }
.stats strong { display: block; font-size: 24px; color: var(--text); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-block; background: var(--accent); color: var(--accent-ink); text-decoration: none; font-weight: 600;
  padding: 9px 16px; border-radius: 10px; border: 1px solid var(--accent); }
.btn.ghost { background: transparent; color: var(--accent); }

/* Subject cards */
.level { margin-top: 28px; }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.card { display: block; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px;
  color: var(--text); text-decoration: none; transition: border-color .15s, transform .15s; }
a.card:hover { border-color: var(--accent); transform: translateY(-1px); }
.card h3 { font-size: 18px; margin: 6px 0 4px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.card .code { font: 600 12px ui-monospace, monospace; color: var(--accent); background: var(--accent-soft); padding: 2px 8px; border-radius: 99px; }
.card.soon { opacity: .6; }
.card.soon .code { color: var(--muted); background: var(--band); }
.how { margin: 40px 0; }
.steps { padding-left: 20px; max-width: 70ch; }
.steps li { margin-bottom: 8px; }

/* Tables */
.table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
th { font-size: 13px; color: var(--muted); font-weight: 600; background: var(--band); }
.num { text-align: right; white-space: nowrap; }
td.num { font-variant-numeric: tabular-nums; }
.bar { display: block; height: 4px; margin-top: 4px; margin-left: auto; width: var(--w); max-width: 100%;
  background: var(--accent); border-radius: 2px; }
.topics td:first-child a { font-weight: 600; }
@media (max-width: 560px) {
  table { font-size: 14px; }
  th, td { padding: 8px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}
.filter { display: flex; flex-direction: column; gap: 4px; margin: 20px 0 12px; max-width: 360px; font-size: 14px; color: var(--muted); }
input[type="search"], select { font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--line);
  border-radius: 10px; padding: 8px 12px; }
.note { font-size: 14px; color: var(--muted); }
.papers { padding-left: 20px; }

/* Badges */
.badge { display: inline-block; font: 600 11px system-ui, sans-serif; text-transform: uppercase; letter-spacing: .04em;
  padding: 2px 8px; border-radius: 99px; vertical-align: middle; }
.badge.banker { color: var(--gold); background: var(--gold-soft); }
.badge.rare { color: var(--rare); background: var(--rare-soft); }
h1 .badge { font-size: 13px; }

/* Topic page */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0 0; }
.tabs a { text-decoration: none; padding: 6px 12px; border-radius: 99px; border: 1px solid var(--line); color: var(--text); font-size: 14px; background: var(--surface); }
.filters { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; margin-bottom: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0; list-style: none; }
.chip { font: inherit; font-size: 14px; padding: 5px 12px; border-radius: 99px; border: 1px solid var(--line);
  background: var(--surface); color: var(--text); cursor: pointer; }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.select { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.year h3 { font-size: 18px; margin: 20px 0 8px; color: var(--muted); }
.qlist { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.q { display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; background: var(--surface); border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 14px; }
.q:target { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.q-marks { font-weight: 600; white-space: nowrap; color: var(--accent); }
.q-subs { grid-column: 1 / -1; font-size: 14px; color: var(--muted); }
abbr { text-decoration: none; border-bottom: 1px dotted var(--muted); }
.similar { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; margin-bottom: 8px; }
.similar summary { cursor: pointer; display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: center; font-weight: 600; }
.similar .count { font-weight: 400; font-size: 14px; color: var(--muted); margin-left: auto; }
.similar .chips { margin-top: 10px; }
.similar .chips a { display: inline-block; font-size: 14px; padding: 4px 10px; border-radius: 99px; background: var(--band);
  text-decoration: none; color: var(--text); }
.back { margin: 32px 0; }
[hidden] { display: none !important; }

/* Guide (rendered analysis) */
.prose { max-width: 820px; }
.prose h2 { font-size: 24px; }
.prose h3 { font-size: 18px; margin-top: 1.4em; }
.prose table { display: block; overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; font-size: 14px; }
.prose code { font-size: 90%; background: var(--band); padding: 1px 5px; border-radius: 5px; }

/* Footer */
.foot { border-top: 1px solid var(--line); margin-top: 48px; padding: 24px 0 40px; background: var(--band); }
.foot p { max-width: 80ch; }