/* Âm Lịch và Phong Thủy An Cư: ink-wash paper with one vermilion seal, as in the app; warm night ink in dark mode. */
:root {
  --bg: #f4ede0; --card: #fbf7ef; --ink: #1f1b16; --muted: #5f574c;
  --line: #e2d6c2; --accent: #b8412f;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15130f; --card: #221f19; --ink: #f4ede0; --muted: #b5ab9b;
    --line: #3a352c; --accent: #e07a5f;
  }
}
:root[data-theme="dark"] {
  --bg: #15130f; --card: #221f19; --ink: #f4ede0; --muted: #b5ab9b;
  --line: #3a352c; --accent: #e07a5f;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding: 24px 16px 64px;
}
main { max-width: 720px; margin: 0 auto; }
header { margin-bottom: 26px; }
h1 { font-weight: 800; font-size: 1.75rem; margin: 0 0 6px; letter-spacing: -.01em; }
h2 { font-size: 1.1rem; margin: 32px 0 10px; padding-top: 14px; border-top: 1px solid var(--line); }
h3 { font-size: 1rem; margin: 22px 0 6px; }
.meta { color: var(--muted); font-size: .92rem; margin: 2px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; margin: 16px 0; }
a { color: var(--accent); text-underline-offset: 2px; }
ul, ol { padding-left: 20px; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.scroll { overflow-x: auto; }
nav.top { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
nav.top a {
  text-decoration: none; border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 14px; color: var(--ink); font-size: .9rem; background: var(--card);
}
footer { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; }