/* PrepWiser SEO — dark, fast, no JS for first paint */
:root {
  --bg: #080808;
  --panel: #0c0c0c;
  --panel-2: #111111;
  --line: rgba(255,255,255,0.08);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.55);
  --accent: #CCFF00;
  --easy: #5cdb95;
  --medium: #ffcf40;
  --hard: #ff6b6b;
  --pyq: #66ccff;
}
* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  font-family: ui-sans-serif, -apple-system, system-ui, "Segoe UI", Roboto, Inter, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 880px; }

/* topbar */
.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(8,8,8,0.85);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; padding-top: 16px; padding-bottom: 16px; }
.logo { font-weight: 900; letter-spacing: 0.04em; font-size: 18px; }
.logo span { color: var(--accent); margin-left: 4px; }
nav { display: flex; align-items: center; gap: 24px; font-size: 14px; }
nav a { color: var(--muted); font-weight: 600; }
nav a:hover { color: var(--text); }
.cta { background: var(--accent); color: #000 !important; padding: 8px 14px; font-weight: 800; }

/* crumbs */
.crumbs { border-bottom: 1px solid var(--line); padding: 12px 0; font-size: 13px; }
.crumbs a { color: var(--muted); }
.crumbs a:last-child { color: var(--text); }
.crumbs .sep { margin: 0 8px; color: var(--muted); }

/* badge */
.badge {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.3em;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 16px;
  text-transform: uppercase;
}

/* hero */
.hero { padding: 80px 0 60px; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: clamp(36px, 6vw, 72px); line-height: 0.95; letter-spacing: -0.02em; margin: 0 0 24px; font-weight: 900; }
.hero .accent { color: var(--accent); }
.hero .lead { font-size: 18px; color: var(--muted); max-width: 680px; margin: 0 0 32px; }
.cta-row { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 22px; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase; font-size: 13px; transition: transform 0.1s; }
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: #000; }
.btn.secondary { background: transparent; color: var(--text); border: 1px solid var(--line); }
.metarow { display: flex; gap: 48px; margin-top: 48px; flex-wrap: wrap; }
.metarow > div { display: flex; flex-direction: column; }
.metarow strong { font-size: 32px; font-weight: 900; line-height: 1; }
.metarow span { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.2em; margin-top: 8px; }

/* subjects */
.subjects { padding: 80px 0; border-bottom: 1px solid var(--line); }
.subjects h2 { font-size: 32px; margin: 0 0 32px; font-weight: 900; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.card { background: var(--panel); border: 1px solid var(--line); padding: 32px; transition: border-color 0.15s; display: block; position: relative; }
.card:hover { border-color: rgba(204,255,0,0.5); }
.card-tag { font-size: 11px; letter-spacing: 0.3em; color: var(--muted); font-weight: 800; margin-bottom: 16px; }
.card h3 { font-size: 28px; margin: 0 0 12px; font-weight: 900; }
.card p { color: var(--muted); margin: 0; }
.card .arrow { position: absolute; top: 32px; right: 32px; color: var(--accent); font-size: 20px; font-weight: 900; }

/* pitch */
.pitch { padding: 80px 0; border-bottom: 1px solid var(--line); }
.cols-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.pitch h2 { font-size: 40px; line-height: 1; margin: 0 0 24px; font-weight: 900; }
.pitch p { color: var(--muted); font-size: 16px; }
.checklist { background: var(--panel); border: 1px solid var(--line); padding: 32px; }
.checklist h3 { font-size: 14px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); margin: 0 0 16px; font-weight: 800; }
.checklist ul { list-style: none; padding: 0; margin: 0; }
.checklist li { padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.checklist li:last-child { border: 0; }
.checklist li::before { content: "→ "; color: var(--accent); font-weight: 900; margin-right: 6px; }

@media (max-width: 768px) {
  .cols-2 { grid-template-columns: 1fr; gap: 32px; }
}

/* subject hub */
.subject-hub { padding: 60px 0 40px; border-bottom: 1px solid var(--line); }
.subject-hub h1 { font-size: clamp(32px, 5vw, 56px); line-height: 1; letter-spacing: -0.02em; margin: 0 0 16px; font-weight: 900; }
.subject-hub .accent { color: var(--accent); }
.subject-hub .lead { font-size: 16px; color: var(--muted); max-width: 640px; }
.chapter-list { padding: 60px 0; }
.chapter-list h2 { font-size: 24px; margin: 0 0 24px; font-weight: 900; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 12px; }
.row-card { background: var(--panel); border: 1px solid var(--line); padding: 20px 24px; display: flex; align-items: center; justify-content: space-between; transition: border-color 0.15s; gap: 16px; }
.row-card:hover { border-color: rgba(204,255,0,0.5); }
.row-card h3 { margin: 0 0 6px; font-size: 18px; font-weight: 800; }
.row-card p { margin: 0; color: var(--muted); font-size: 13px; }
.row-card .arrow { color: var(--accent); font-weight: 900; }

/* chapter hub */
.chapter-hub { padding: 60px 0 40px; border-bottom: 1px solid var(--line); }
.chapter-hub h1 { font-size: clamp(32px, 5vw, 56px); line-height: 1; letter-spacing: -0.02em; margin: 0 0 16px; font-weight: 900; }
.chapter-hub .accent { color: var(--accent); }
.chapter-hub .lead { color: var(--muted); max-width: 640px; }
.q-list { padding: 40px 0 80px; }
.q-list h2 { font-size: 20px; margin: 0 0 24px; font-weight: 900; color: var(--muted); }
.q-rows { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.q-rows ol { counter-reset: list; }
ol.q-rows { list-style-position: inside; }
.q-card { background: var(--panel); border: 1px solid var(--line); padding: 20px 24px; display: block; transition: border-color 0.15s; }
.q-card:hover { border-color: rgba(204,255,0,0.5); }
.q-card-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.q-card-meta > span { font-size: 11px; padding: 3px 8px; border: 1px solid var(--line); letter-spacing: 0.1em; text-transform: uppercase; font-weight: 700; }
.diff { color: var(--text); }
.diff.diff-easy { border-color: var(--easy); color: var(--easy); }
.diff.diff-medium { border-color: var(--medium); color: var(--medium); }
.diff.diff-hard { border-color: var(--hard); color: var(--hard); }
.type { color: var(--muted); }
.marks { color: var(--muted); }
.pyq { color: var(--pyq); border-color: var(--pyq); }
.q-card-body { margin: 0; color: var(--text); font-size: 15px; }
.q-card .arrow { display: inline-block; margin-top: 12px; color: var(--accent); font-size: 13px; font-weight: 800; }

/* question page */
.question-page { padding: 60px 0 80px; }
.q-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 32px; }
.q-meta > span { font-size: 11px; padding: 4px 10px; border: 1px solid var(--line); letter-spacing: 0.1em; text-transform: uppercase; font-weight: 700; }
.q-statement { font-size: 22px; line-height: 1.5; font-weight: 600; color: var(--text); margin: 0 0 32px; }
.q-options { list-style: none; padding: 0; margin: 0 0 32px; display: flex; flex-direction: column; gap: 8px; }
.q-options li { background: var(--panel); border: 1px solid var(--line); padding: 14px 18px; display: flex; align-items: center; gap: 14px; }
.q-options li.correct { border-color: var(--accent); background: rgba(204,255,0,0.04); }
.opt-id { font-weight: 900; color: var(--accent); width: 24px; }
.opt-text { flex: 1; }
.opt-badge { font-size: 10px; padding: 3px 8px; background: var(--accent); color: #000; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.q-answer-box { background: var(--panel); border: 1px solid var(--accent); padding: 20px 24px; display: flex; justify-content: space-between; align-items: center; margin-bottom: 32px; }
.q-answer-box .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.2em; font-weight: 700; }
.q-answer-box .value { font-size: 24px; font-weight: 900; color: var(--accent); }
.solution { background: var(--panel); border-left: 3px solid var(--accent); padding: 24px 28px; margin: 32px 0; }
.solution h2 { font-size: 12px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; font-weight: 800; }
.solution-body { color: var(--text); font-size: 15px; line-height: 1.7; white-space: pre-wrap; }
.solution.placeholder { background: var(--panel-2); border-left-color: var(--line); }
.context { padding: 24px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin: 32px 0; }
.context h3 { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; font-weight: 800; }
.context p { margin: 6px 0; font-size: 14px; color: var(--muted); }
.context a { color: var(--text); border-bottom: 1px dotted var(--muted); }
.related { margin-top: 48px; }
.related h3 { font-size: 14px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--accent); margin: 0 0 16px; font-weight: 800; }

/* cta strip */
.cta-strip { background: var(--accent); color: #000; padding: 64px 0; }
.cta-strip h2 { font-size: clamp(28px, 4vw, 44px); margin: 0 0 12px; font-weight: 900; line-height: 1; }
.cta-strip p { margin: 0 0 24px; font-size: 16px; max-width: 600px; }
.cta-strip .btn { background: #000; color: var(--accent); border: 0; }

/* footer */
.footer { padding: 64px 0 32px; border-top: 1px solid var(--line); }
.footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
.footer h4 { font-size: 11px; letter-spacing: 0.3em; text-transform: uppercase; color: var(--accent); margin: 0 0 16px; font-weight: 800; }
.footer a { display: block; padding: 6px 0; color: var(--muted); font-size: 14px; }
.footer a:hover { color: var(--text); }
.footer .logo { display: inline-block; margin-bottom: 12px; }
.footer p { color: var(--muted); font-size: 14px; max-width: 360px; margin: 0; }
.fineprint { font-size: 12px; color: var(--muted); padding-top: 24px; border-top: 1px solid var(--line); letter-spacing: 0.05em; }
@media (max-width: 768px) {
  .footer .cols { grid-template-columns: 1fr 1fr; }
}