:root {
  color-scheme: dark;
  --bg: #0e0c13;
  --panel: #1b1824;
  --panel-2: #231f2e;
  --text: #e8e6ee;
  --muted: #a9aac9;
  --gold: #ffaa00;
  --gold-soft: #ffd27a;
  --line: #3a3644;
  --accent: #55ffff;
}
@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f4f2f8;
    --panel: #ffffff;
    --panel-2: #f7f5fb;
    --text: #1c1a24;
    --muted: #5a5670;
    --gold: #9a6400;
    --gold-soft: #7a4f00;
    --line: #d8d5de;
    --accent: #007a8a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.wrap { max-width: 860px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
a { color: var(--gold); }
a:hover { color: var(--gold-soft); }

.top { background: linear-gradient(135deg, #1b1030 0%, #231540 45%, #0d1f2e 100%); border-bottom: 4px solid #000; box-shadow: 0 4px 0 rgba(0, 0, 0, .25); }
.top .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 20px; padding-top: 12px; padding-bottom: 12px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: #ffcf66; font-weight: 800; font-size: 1.15rem; text-decoration: none; letter-spacing: .01em; }
.brand img { image-rendering: pixelated; }
.top nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
.top nav a { color: #e8e6ee; text-decoration: none; font-size: .95rem; padding: 2px 0; border-bottom: 2px solid transparent; }
.top nav a:hover, .top nav a[aria-current="page"] { color: #ffcf66; border-bottom-color: #ffaa00; }

main { padding-top: 28px; padding-bottom: 24px; }
h1 { margin: 0 0 8px; font-size: clamp(1.7rem, 4.6vw, 2.35rem); line-height: 1.2; color: var(--gold); }
h2 { margin: 34px 0 10px; font-size: 1.35rem; line-height: 1.3; color: var(--gold); }
h3 { margin: 22px 0 6px; font-size: 1.08rem; line-height: 1.35; }
p { margin: 0 0 14px; }
ul, ol { margin: 0 0 14px; padding-left: 22px; }
li { margin-bottom: 6px; }
.lead { font-size: 1.12rem; color: var(--muted); margin-bottom: 20px; }
.meta { color: var(--muted); font-size: .9rem; margin-bottom: 22px; }
code, .formula { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .93em; }
.formula { display: block; background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--gold); padding: 10px 14px; margin: 0 0 16px; overflow-x: auto; white-space: pre-wrap; }
.note { background: var(--panel); border: 1px solid var(--line); padding: 12px 16px; margin: 0 0 16px; }
.note strong { color: var(--gold); }
.toc { background: var(--panel); border: 1px solid var(--line); padding: 12px 18px 4px; margin: 0 0 22px; }
.toc p { margin: 0 0 6px; font-weight: 700; }
.table-wrap { overflow-x: auto; margin: 0 0 16px; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; background: var(--panel); }
th, td { border: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
th { background: var(--panel-2); color: var(--gold); font-weight: 700; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); margin: 0 0 18px; }
.card { display: block; background: var(--panel); border: 1px solid var(--line); padding: 14px 16px; text-decoration: none; color: var(--text); }
.card:hover { border-color: var(--gold); }
.card strong { display: block; color: var(--gold); margin-bottom: 4px; font-size: 1.05rem; }
.card span { color: var(--muted); font-size: .93rem; }

.cta-row { margin: 30px 0 8px; }
.cta { display: inline-block; padding: 11px 20px; background: #2f7d32; color: #fff; font-weight: 700; text-decoration: none; border: 2px solid #1b4d1d; }
.cta:hover { background: #38923b; color: #fff; }

.more { display: grid; gap: 8px 28px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); border-top: 1px solid var(--line); margin-top: 26px; padding-top: 6px; }
.more h2 { font-size: 1.05rem; margin: 16px 0 8px; }
.more ul { font-size: .95rem; }

.foot { border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 40px; color: var(--muted); font-size: .9rem; }
.foot p { margin-bottom: 8px; }