:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1c2230;
  --muted: #5d6578;
  --line: #e3e6ec;
  --accent: #3b6ef5;
  --accent-soft: #e8eefe;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #12151c; --card: #1b1f29; --text: #e6e9f0; --muted: #9aa2b5; --line: #2b3140; --accent: #6d93ff; --accent-soft: #232c45; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header { display: flex; align-items: center; gap: 12px; padding-top: 28px; }
.logo { width: 40px; height: 40px; border-radius: 10px; background: var(--accent); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 1.2rem; }
header a { color: inherit; text-decoration: none; font-weight: 700; font-size: 1.2rem; }
nav { margin-left: auto; display: flex; gap: 16px; }
nav a { font-weight: 500; font-size: 0.95rem; color: var(--muted); }
h1 { font-size: 2.1rem; line-height: 1.2; margin: 40px 0 12px; }
h2 { margin: 36px 0 8px; font-size: 1.25rem; }
p, li { color: var(--text); }
.lede { font-size: 1.15rem; color: var(--muted); }
a { color: var(--accent); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; margin: 14px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.grid .card { margin: 0; }
.grid h3 { margin: 0 0 4px; font-size: 1rem; }
.grid p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.note { background: var(--accent-soft); border-radius: 12px; padding: 12px 16px; }
footer { color: var(--muted); font-size: 0.9rem; padding-top: 40px; padding-bottom: 40px; border-top: 1px solid var(--line); margin-top: 48px; }
table { width: 100%; border-collapse: collapse; }
td, th { text-align: left; padding: 8px 10px; border-top: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; border-top: none; }
.center { text-align: center; padding-top: 80px; }