:root {
  --bg: #f7f8f4;
  --surface: #ffffff;
  --ink: #1d2a22;
  --muted: #5b6a60;
  --line: #dde3da;
  --sage: #4f7a5c;
  --sage-soft: #e6efe7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121814;
    --surface: #1a221d;
    --ink: #e8eee9;
    --muted: #a3b2a8;
    --line: #2c3830;
    --sage: #8cc09b;
    --sage-soft: #213028;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
}
a { color: var(--sage); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.top {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
header.top .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { font-weight: 700; font-size: 22px; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--sage); }
nav a { margin-left: 18px; text-decoration: none; color: var(--muted); font-size: 15px; }
nav a:hover { color: var(--ink); }
.hero { padding: 64px 0 40px; }
.hero h1 { font-size: 40px; line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p { font-size: 19px; color: var(--muted); margin: 0; max-width: 34em; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); margin: 8px 0 48px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px;
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
section h2 { font-size: 24px; margin: 40px 0 12px; letter-spacing: -0.01em; }
.contact {
  background: var(--sage-soft); border-radius: 14px; padding: 22px 24px; margin: 16px 0 56px;
}
.contact dl { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; }
.contact dt { color: var(--muted); }
.contact dd { margin: 0; }
.doc h1 { font-size: 32px; margin: 48px 0 4px; }
.doc .meta { color: var(--muted); margin: 0 0 24px; font-size: 15px; }
.doc h2 { font-size: 20px; margin: 32px 0 8px; }
.doc ul { padding-left: 22px; }
.doc li { margin: 4px 0; }
footer {
  border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px;
}
footer a { color: var(--muted); margin-right: 16px; }
@media (max-width: 520px) {
  .hero h1 { font-size: 31px; }
  .contact dl { grid-template-columns: 1fr; }
  .contact dt { margin-top: 8px; }
}