:root{--bg: #f6f5f1;--surface: #ffffff;--surface-2: #efede6;--text: #1f2328;--muted: #5d636b;--border: #d9d6cc;--accent: #2f6f4e;--accent-text: #ffffff;--warn: #a15c00;--bad: #b3261e;--good: #2f6f4e;--book: #2f5d9e;--engine: #7a4fa0;--radius: 10px;--board-light: #ece6d6;--board-dark: #7d9b76;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--text);background:var(--bg);-webkit-text-size-adjust:100%}@media(prefers-color-scheme:dark){:root{--bg: #15181c;--surface: #1f2328;--surface-2: #2a2f36;--text: #e8e6e1;--muted: #a3a8ae;--border: #3a4048;--accent: #4f9a72;--warn: #e0a24a;--bad: #ef6b62;--good: #6cc196;--book: #7aa7e6;--engine: #b892dc;--board-light: #d8d2c0;--board-dark: #6a8664}}*{box-sizing:border-box}html,body{margin:0;background:var(--bg)}body{min-height:100dvh}a{color:var(--accent)}button,input,select,textarea{font:inherit;color:inherit}.app{max-width:1100px;margin:0 auto;padding:0 16px 32px}.topbar{display:flex;align-items:center;gap:12px;padding:10px 0;flex-wrap:wrap}.topbar .brand{font-weight:700;text-decoration:none;color:var(--text);margin-right:auto}.topbar nav{display:flex;gap:4px;flex-wrap:wrap}.topbar nav a{text-decoration:none;color:var(--muted);padding:6px 10px;border-radius:8px}.topbar nav a.active{color:var(--text);background:var(--surface-2)}.btn{border:1px solid var(--border);background:var(--surface);padding:10px 14px;border-radius:var(--radius);cursor:pointer;min-height:44px}.btn:hover{background:var(--surface-2)}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}.btn.big{font-size:1.1rem;padding:14px 18px;min-height:52px}.btn:disabled{opacity:.5;cursor:default}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.stack{display:flex;flex-direction:column;gap:12px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px}.muted{color:var(--muted)}.small{font-size:.85rem}h1{font-size:1.5rem;margin:8px 0 12px}h2{font-size:1.15rem;margin:0 0 8px}label.field{display:flex;flex-direction:column;gap:4px;font-size:.9rem;color:var(--muted)}label.field>input,label.field>select{padding:10px;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);min-height:44px}.play-layout{display:grid;grid-template-columns:minmax(0,560px) minmax(0,1fr);gap:16px;align-items:start}@media(max-width:860px){.play-layout{grid-template-columns:1fr}}.board-wrap{width:100%;max-width:560px;touch-action:none}.movelist{display:grid;grid-template-columns:2.2em 1fr 1fr;gap:2px 6px;font-variant-numeric:tabular-nums;max-height:260px;overflow-y:auto}.movelist .num{color:var(--muted)}.movelist button{text-align:left;background:none;border:0;padding:2px 4px;border-radius:4px;cursor:pointer}.movelist button.cur{background:var(--surface-2);font-weight:600}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:.78rem;font-weight:600;border:1px solid currentColor}.badge.book{color:var(--book)}.badge.verified{color:var(--good)}.badge.engine{color:var(--engine)}.badge.warn,.j-inaccuracy{color:var(--warn)}.j-mistake{color:#d07a1a}.j-blunder{color:var(--bad)}.promo{position:fixed;inset:0;background:#00000073;display:grid;place-items:center;z-index:20}.promo .card{display:flex;gap:8px}.promo button{font-size:2rem;width:64px;height:64px}.grid-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}.mode-card{text-decoration:none;color:var(--text)}.mode-card h2{margin-bottom:4px}.error{color:var(--bad)}