:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1b2233;
  --muted: #5b6475;
  --line: #e4e1d8;
  --accent: #1f3a8a;
  --gold: #b58a2f;
  --radius: 14px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10141f;
    --surface: #171c2a;
    --text: #eceef3;
    --muted: #a3aaba;
    --line: #262d40;
    --accent: #8fa8ff;
    --gold: #d8b25a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--line);
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 650;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: -0.04em;
}

nav.site { display: flex; gap: 18px; font-size: 15px; }
nav.site a { color: var(--muted); text-decoration: none; }
nav.site a:hover, nav.site a[aria-current="page"] { color: var(--text); }

.hero { padding: 72px 0 40px; }
.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 6vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.hero p { margin: 0; max-width: 600px; font-size: 19px; color: var(--muted); }


.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  padding: 24px 0 64px;
}

.card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.card h2 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.card::before {
  content: "";
  display: block;
  width: 28px;
  height: 3px;
  margin-bottom: 14px;
  border-radius: 2px;
  background: var(--gold);
}

.doc { padding: 48px 0 64px; max-width: 720px; }
.doc h1 { margin: 0 0 6px; font-size: clamp(28px, 7vw, 34px); line-height: 1.15; letter-spacing: -0.02em; }
.doc .updated { margin: 0 0 32px; color: var(--muted); font-size: 15px; }
.doc h2 { margin: 36px 0 8px; font-size: 21px; }
.doc ul { padding-left: 22px; }
.doc li { margin: 4px 0; }

footer.site {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 14px;
}
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
footer.site a { color: var(--muted); }

@media (max-width: 560px) {
  header.site .wrap { flex-wrap: wrap; gap: 6px 10px; padding-top: 12px; padding-bottom: 12px; }
  .brand { gap: 8px; font-size: 15px; }
  nav.site { gap: 10px; font-size: 13px; }
  .hero { padding: 48px 0 24px; }
}