:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --panel: #f4f5f7;
  --fg: #1a1d21;
  --muted: #5b6470;
  --border: #d8dce2;
  --accent: #2f6feb;
  --accent-fg: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1e1e1e;
    --panel: #252526;
    --fg: #e6e6e6;
    --muted: #a9afb8;
    --border: #3a3a3d;
    --accent: #4c9aff;
    --accent-fg: #0b1220;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--fg);
  background: var(--bg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); }

.site-head,
main,
.site-foot {
  width: min(780px, calc(100% - 36px));
  margin-inline: auto;
}

.site-head {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-block: 18px;
  border-bottom: 1px solid var(--border);
}

.site-head a:first-child {
  color: var(--fg);
  font-weight: 700;
  text-decoration: none;
}

.site-head a:last-child { margin-left: auto; }

main { padding-block: 54px 64px; }

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

h2 {
  margin: 2.4rem 0 0.55rem;
  font-size: 1.35rem;
  line-height: 1.25;
}

.lead {
  max-width: 68ch;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.12rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: 28px 0 8px;
}

.cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 8px;
  color: var(--accent-fg);
  background: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.cta-note { color: var(--muted); font-size: 0.9rem; }

ul { padding-left: 1.3rem; }
li + li { margin-top: 0.35rem; }

.format-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
  margin-top: 30px;
}

.format-card {
  display: block;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--fg);
  background: var(--panel);
  text-decoration: none;
}

.format-card strong { display: block; }
.format-card span { color: var(--muted); font-size: 0.9rem; }
.format-card:hover { border-color: var(--accent); }

.related {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
}

.site-foot {
  padding-block: 24px 36px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 520px) {
  .site-head { align-items: flex-start; }
  main { padding-block-start: 38px; }
}