:root {
  --bg: #fbfaf7;
  --fg: #1b1d21;
  --muted: #5b6270;
  --line: #e4e1da;
  --card: #ffffff;
  --accent: #1f5f8b;
  --accent-soft: #e6eff6;
  --warn-soft: #f6f1e4;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e8e6e1;
    --muted: #a3a9b4;
    --line: #2a2e35;
    --card: #1b1e23;
    --accent: #7db7e0;
    --accent-soft: #1d2a35;
    --warn-soft: #2a261b;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", Arial, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.top { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; }
.logo { font-weight: 700; font-size: 20px; letter-spacing: -0.01em; color: var(--fg); text-decoration: none; }
.logo span { color: var(--accent); }
nav.lang a { color: var(--muted); text-decoration: none; font-size: 15px; margin-left: 14px; }
nav.lang a[aria-current="page"] { color: var(--fg); font-weight: 600; }
.status {
  display: inline-block; font-size: 13px; font-weight: 600; color: var(--accent);
  background: var(--accent-soft); border-radius: 999px; padding: 4px 12px; margin-top: 28px;
}
h1 { font-size: clamp(30px, 6vw, 44px); line-height: 1.15; letter-spacing: -0.02em; margin: 16px 0 18px; }
.lead { font-size: 19px; color: var(--muted); margin: 0 0 36px; }
h2 { font-size: 22px; margin: 44px 0 12px; letter-spacing: -0.01em; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 8px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.example {
  margin-top: 14px; font-size: 15px; border-left: 3px solid var(--accent);
  padding: 6px 0 6px 12px; color: var(--fg);
}
.example small { display: block; color: var(--muted); }
.not { background: var(--warn-soft); border-radius: 14px; padding: 18px 22px; margin-top: 12px; }
.not p { margin: 0; }
a { color: var(--accent); }
footer { border-top: 1px solid var(--line); margin-top: 56px; padding: 22px 0 40px; color: var(--muted); font-size: 14px; }
footer p { margin: 4px 0; }