:root { --bg: #f5f6f8; --card: #ffffff; --text: #1d2330; --muted: #5d6677; --primary: #0F766E; --border: #e1e4ea; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #14171c; --card: #1d2128; --text: #e8eaee; --muted: #a2a9b6; --primary: #14B8A6; --border: #2c323c; }
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
       background: var(--bg); color: var(--text); line-height: 1.6; }
main { max-width: 760px; margin: 32px auto; padding: 28px 24px; background: var(--card);
       border: 1px solid var(--border); border-radius: 14px; }
@media (max-width: 800px) { main { margin: 16px; padding: 20px 16px; } }
h1 { margin: 12px 0 4px; font-size: 1.8rem; }
h2 { margin: 26px 0 6px; font-size: 1.1rem; }
p, li { color: var(--text); }
ul { padding-left: 20px; }
a { color: var(--primary); }
.back { font-size: .9rem; text-decoration: none; }
.note { color: var(--muted); font-size: .9rem; margin-top: 0; }
.foot { margin-top: 32px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; }