:root{--bg:#0f1220;--card:#181c2e;--line:#2a3050;--fg:#e8ebf7;--muted:#9aa3c0;--accent:#5b8cff;--good:#34d399;--bad:#f87171;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--fg);-webkit-text-size-adjust:100%;margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}main{max-width:520px;margin:0 auto;padding:16px 16px 96px}h1{margin:8px 0 4px;font-size:1.6rem}h2{margin:0 0 8px;font-size:1.1rem}p{line-height:1.5}.muted{color:var(--muted)}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;margin:12px 0;padding:16px}button{font:inherit;color:var(--fg);background:var(--card);border:1px solid var(--line);cursor:pointer;border-radius:10px;min-height:44px;padding:10px 14px}button.primary,a.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}a.btn{border:1px solid var(--line);background:var(--card);min-height:44px;color:var(--fg);border-radius:10px;justify-content:center;align-items:center;padding:10px 14px;text-decoration:none;display:inline-flex}button:disabled{opacity:.5;cursor:default}nav{border-top:1px solid var(--line);padding:8px max(8px, env(safe-area-inset-left));-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#0f1220f2;justify-content:space-around;gap:4px;display:flex;position:fixed;bottom:0;left:0;right:0}nav a{color:var(--muted);border-radius:8px;padding:8px 12px;font-size:.85rem;text-decoration:none}nav a[aria-current=page]{color:var(--fg);background:var(--card)}.grid{border:2px solid var(--line);aspect-ratio:1;touch-action:manipulation;border-radius:8px;grid-template-columns:repeat(9,1fr);gap:0;width:100%;display:grid;overflow:hidden}.cell{aspect-ratio:1;text-align:center;font-variant-numeric:tabular-nums;background:var(--card);width:100%;min-height:0;color:var(--fg);border:0;border-right:1px solid var(--line);border-bottom:1px solid var(--line);caret-color:#0000;border-radius:0;padding:0;font-size:clamp(1rem,4.6vw,1.4rem)}.cell:nth-child(9n){border-right:0}.cell.box-right{border-right:2px solid var(--line)}.cell.box-bottom{border-bottom:2px solid var(--line)}.cell.given{color:var(--muted);background:#141829;font-weight:600}.cell.flict{color:var(--bad)}.cell.sel{outline:2px solid var(--accent);outline-offset:-2px}.pad{grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px;display:grid}.row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.banner{border-radius:10px;margin-top:12px;padding:12px}.banner.ok{border:1px solid var(--good);background:#34d3991f}.banner.err{border:1px solid var(--bad);background:#f871711f}.board4{border:1px solid var(--line);aspect-ratio:1;touch-action:none;background:#141829;border-radius:12px;grid-template-columns:repeat(4,1fr);gap:8px;padding:8px;display:grid}.tile{color:var(--fg);font-variant-numeric:tabular-nums;background:#1f2540;border-radius:8px;place-items:center;font-size:clamp(.9rem,4.2vw,1.4rem);font-weight:700;display:grid}.tile[data-v="2"]{background:#2b3355}.tile[data-v="4"]{background:#34406b}.tile[data-v="8"]{background:#4a5fd0}.tile[data-v="16"]{color:#0b0e1a;background:#5b8cff}.tile[data-v="32"]{color:#0b0e1a;background:#4aa3ff}.tile[data-v="64"]{color:#0b0e1a;background:#34d399}.tile[data-v="128"]{color:#0b0e1a;background:#fbbf24}.tile[data-v="256"],.tile[data-v="512"]{color:#0b0e1a;background:#fb923c}.tile[data-v="1024"],.tile[data-v="2048"]{color:#0b0e1a;background:#f472b6}