:root { --bg: #16171b; --panel: #1f2126; --line: #34373f; --text: #e9e6df; --muted: #a8a59d; --accent: #e0b25c; --light: #f0d9b5; --dark: #b58863; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); } a:hover { color: #f0c97a; }
header, footer { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; padding: 16px 32px; border-color: var(--line); border-style: solid; border-width: 0; }
header { border-bottom-width: 1px; } footer { border-top-width: 1px; color: var(--muted); font-size: 14px; }
.logo { font-weight: 800; font-size: 20px; color: var(--text); text-decoration: none; } .logo b { color: var(--accent); }
nav { display: flex; gap: 20px; } nav a, footer a { text-decoration: none; }
nav a { color: var(--text); }
main { max-width: 1120px; margin: 0 auto; padding: 56px 32px; display: flex; flex-direction: column; gap: 44px; }
h1 { font-size: 52px; line-height: 1.05; margin: 0 0 12px; }
.lead { color: var(--muted); font-size: 19px; margin: 0; max-width: 760px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; }
.see { display: grid; grid-template-columns: minmax(0, 1.4fr) 300px; gap: 32px; align-items: center; padding: 28px; border-color: var(--accent); text-decoration: none; color: var(--text); }
.see:hover { border-color: #f0c97a; }
.see h2 { display: flex; align-items: center; gap: 10px; margin: 0; font-size: 32px; } .see h2 span.o { color: var(--accent); }
.live { background: var(--accent); color: var(--bg); border-radius: 999px; padding: 3px 10px; font-size: 13px; font-weight: 700; }
.see .tag { font-size: 22px; font-weight: 600; margin: 12px 0 8px; } .see p { color: var(--muted); margin: 0 0 18px; }
.cta { display: inline-block; background: var(--accent); color: var(--bg); border-radius: 10px; padding: 14px 22px; font-weight: 700; font-size: 17px; }
.board { aspect-ratio: 1; border-radius: 10px; background: repeating-conic-gradient(var(--dark) 0 25%, var(--light) 0 50%) 0 0 / 25% 25%; }
.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.facts .card { padding: 20px; } .facts h3 { margin: 0 0 6px; font-size: 18px; } .facts p { margin: 0; color: var(--muted); }
.prose { max-width: 760px; } .prose h1 { font-size: 40px; } .prose h2 { font-size: 22px; margin: 28px 0 6px; }
.prose p, .prose li { color: #d6d3cc; } .draft { border: 1px dashed var(--accent); border-radius: 10px; padding: 10px 14px; color: var(--accent); font-size: 14px; }
@media (max-width: 760px) { h1 { font-size: 34px; } .see { grid-template-columns: 1fr; } .see .board { display: none; } .facts { grid-template-columns: 1fr; } main { padding: 32px 20px; } header, footer { padding: 14px 20px; } }

/* 12 Nov 2026: tabs in the header; the Visualization tool tab opens see.chess123.app. Compact so the page fits one screen. */
nav { align-items: center; flex-wrap: wrap; }
.tab { border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; font-size: 15px; }
.tab.on { background: var(--accent); border-color: var(--accent); color: var(--bg); font-weight: 700; }
.tab.on:hover { background: #f0c97a; color: var(--bg); }
.tab.soon { color: var(--muted); border-style: dashed; cursor: default; }
main { padding: 36px 32px; gap: 28px; }
h1 { font-size: 42px; margin: 0 0 8px; }
.see { padding: 24px; grid-template-columns: minmax(0, 1.4fr) 220px; }
.see .kind { color: var(--accent); font-size: 14px; font-weight: 600; margin-top: 4px; }
.see .tag { margin: 8px 0 6px; }
@media (max-width: 760px) { h1 { font-size: 30px; } .tab.soon { display: none; } nav { gap: 12px; } .see { grid-template-columns: 1fr; } .see h2 { font-size: 28px; } }