:root { --text: #121a26; --muted: #5b6777; --line: #e3e8ef; --bg: #f5f7fa; --surface: #fff; --brand: #1f6fd1; }
@media (prefers-color-scheme: dark) { :root { --text: #e8edf4; --muted: #9aa6b5; --line: #263040; --bg: #0f141b; --surface: #161d27; --brand: #5aa2ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15.5px/1.7 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', sans-serif; }
a { color: var(--brand); }
.lg-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; max-width: 820px; margin: 0 auto; padding: 20px 16px; }
.lg-brand img { display: block; }
.lg-top nav { display: flex; gap: 4px; flex-wrap: wrap; }
.lg-top nav a { color: var(--muted); text-decoration: none; font-size: 14px; padding: 6px 12px; border-radius: 999px; }
.lg-top nav a:hover { color: var(--text); background: var(--surface); }
.lg-top nav a.on { color: var(--brand); background: var(--surface); font-weight: 600; }
.lg-doc { max-width: 820px; margin: 0 auto; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: clamp(20px, 5vw, 48px); }
.lg-doc h1 { margin: 0 0 4px; font-size: clamp(24px, 4vw, 32px); line-height: 1.25; letter-spacing: -0.01em; }
.lg-meta { margin: 0 0 24px; color: var(--muted); font-size: 13.5px; }
.lg-doc h2 { margin: 32px 0 8px; font-size: 18px; }
.lg-doc ul, .lg-doc ol { padding-left: 22px; }
.lg-doc li { margin: 4px 0; }
.lg-doc hr { border: 0; border-top: 1px solid var(--line); margin: 36px 0 8px; }
.lg-foot { max-width: 820px; margin: 0 auto; padding: 24px 16px 40px; color: var(--muted); font-size: 13px; text-align: center; }