:root {
  --bg: #f7faf9;
  --surface: #ffffff;
  --text: #13201e;
  --muted: #55655f;
  --line: #dbe5e2;
  --brand: #15706e;
  --brand-soft: #d6efec;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1513;
    --surface: #16201e;
    --text: #e6efec;
    --muted: #9fb2ac;
    --line: #26332f;
    --brand: #4fc3b5;
    --brand-soft: #173a36;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}
a { color: var(--brand); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 800; font-size: 1.25rem; color: var(--text); text-decoration: none; }
.logo span { color: var(--brand); }
nav a { margin-left: 16px; text-decoration: none; color: var(--muted); font-size: .95rem; }
.hero { padding: 56px 0 32px; }
.hero h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); line-height: 1.15; margin: 0 0 16px; }
.hero p { font-size: 1.15rem; color: var(--muted); margin: 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; padding: 24px 0 40px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.note { background: var(--brand-soft); border-radius: 14px; padding: 16px 18px; margin-bottom: 40px; }
.doc { padding: 32px 0 48px; }
.doc h1 { font-size: 1.9rem; margin-top: 0; }
.doc h2 { font-size: 1.2rem; margin-top: 2em; }
.doc .meta { color: var(--muted); }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
footer .wrap { padding: 20px 16px; display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; }