:root {
  --bg: #f6f3ec; --paper: #fffdf8; --text: #1f2a33; --muted: #5d6b76; --line: #e3ddd0;
  --accent: #1f6fa8; --accent2: #c8892b; --head: #12324a;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1820; --paper: #15212b; --text: #e3e9ee; --muted: #93a3b0; --line: #26343f;
          --accent: #6fb3e6; --accent2: #e0a84f; --head: #e8eef3; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--accent); }
.top { max-width: 860px; margin: 0 auto; padding: 20px 16px 0; display: flex; align-items: center;
       justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.brand { font-weight: 800; font-size: 20px; color: var(--head); text-decoration: none; letter-spacing: .3px; }
.brand span { color: var(--accent2); }
.top nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover, .top nav a.on { color: var(--text); text-decoration: underline; }
main { max-width: 860px; margin: 16px auto 40px; padding: 28px 24px; background: var(--paper);
       border: 1px solid var(--line); border-radius: 14px; }
@media (max-width: 600px) { main { margin: 12px 8px 32px; padding: 20px 16px; } }
h1 { font-size: 26px; line-height: 1.25; margin: 0 0 6px; color: var(--head); }
h2 { font-size: 19px; margin: 30px 0 10px; color: var(--head); }
h3 { font-size: 16px; margin: 18px 0 6px; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 20px; }
p, li { margin: 0 0 10px; }
ul, ol { padding-left: 22px; margin: 0 0 12px; }
table { width: 100%; border-collapse: collapse; margin: 8px 0 16px; font-size: 14.5px; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border: 1px solid var(--line); }
th { background: color-mix(in srgb, var(--line) 45%, transparent); }
.table-wrap { overflow-x: auto; }
.note { background: color-mix(in srgb, var(--accent) 9%, transparent); border-left: 3px solid var(--accent);
        padding: 10px 14px; border-radius: 6px; margin: 12px 0 16px; }
.toc { columns: 2; column-gap: 28px; font-size: 15px; padding-left: 20px; }
@media (max-width: 600px) { .toc { columns: 1; } }
footer { max-width: 860px; margin: 0 auto 32px; padding: 0 16px; color: var(--muted); font-size: 13px; }
.hero { text-align: center; padding: 18px 0 8px; }
.hero h1 { font-size: 34px; }
.hero p { color: var(--muted); font-size: 17px; }
.play { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin: 20px 0 8px; }
.play a { display: inline-block; padding: 11px 20px; border-radius: 10px; font-weight: 700; text-decoration: none;
          color: #fff; background: var(--accent); }
.play a.ok { background: #ee8208; }
.play a.ya { background: #222; }
@media (prefers-color-scheme: dark) { .play a.ya { background: #3a4651; } }