:root {
  --bg: #f6f8fc;
  --card: #ffffff;
  --text: #0b1324;
  --muted: #4b5870;
  --brand: #1d4ed8;
  --border: #dce3ee;
  --soft: #eaf1ff;
  --warn-bg: #fff1e6;
  --warn: #9a3412;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #070d1a;
    --card: #0f1829;
    --text: #f1f5f9;
    --muted: #a5b4cb;
    --brand: #7aa2ff;
    --border: #24324f;
    --soft: #16264a;
    --warn-bg: #2e1a0e;
    --warn: #fdba74;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang HK", "Noto Sans HK", "Microsoft JhengHei", Roboto, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 16px 64px; }
header.top { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
header.top img { width: 48px; height: 48px; border-radius: 12px; }
header.top a { color: inherit; text-decoration: none; font-weight: 700; font-size: 18px; }
nav.lang { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0 24px; }
nav.lang a {
  padding: 8px 14px; border-radius: 999px; border: 1px solid var(--border);
  color: var(--brand); text-decoration: none; font-weight: 600; background: var(--card);
}
h1 { font-size: 30px; line-height: 1.25; margin: 0 0 4px; letter-spacing: -0.3px; }
h2 { font-size: 21px; margin: 36px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 15px; }
section.doc { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 24px 20px; margin-bottom: 28px; }
.note { background: var(--warn-bg); color: var(--warn); border-radius: 14px; padding: 12px 14px; font-weight: 600; }
table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 8px 0 12px; }
th, td { text-align: left; vertical-align: top; padding: 10px 8px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
.table-scroll { overflow-x: auto; }
a { color: var(--brand); }
footer { color: var(--muted); font-size: 14px; text-align: center; margin-top: 32px; }
.cards { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.cards a { display: block; padding: 16px; border-radius: 16px; background: var(--card); border: 1px solid var(--border); text-decoration: none; color: var(--text); }
.cards a strong { display: block; color: var(--brand); margin-bottom: 4px; }
.hero { text-align: center; padding: 16px 0 24px; }
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 12px 32px rgba(29, 78, 216, 0.28); }