:root{--w2-bg:#f2efe7;--w2-surface:#fffdf8;--w2-ink:#252522;--w2-muted:#68665f;--w2-line:#d8d2c5;--w2-accent:#8b6338;--w2-accent-2:#476a72;--w2-danger:#9b4d45;--w2-ok:#4f765b;--w2-shadow:0 14px 34px rgba(41,36,28,.10)}html[data-theme='dark']{--w2-bg:#121313;--w2-surface:#1b1c1b;--w2-ink:#efede7;--w2-muted:#aaa79e;--w2-line:#383a37;--w2-accent:#d0a46f;--w2-accent-2:#86aeb6;--w2-danger:#d1867f;--w2-ok:#8cb79a;--w2-shadow:0 14px 34px rgba(0,0,0,.22)}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--w2-bg);color:var(--w2-ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}body{padding:84px 18px 28px}.wave2-main{width:min(100%,980px);margin:0 auto}.wave2-panel{border:1px solid 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0}.gate-bits{font-size:clamp(2rem,9vw,4.8rem);font-weight:800;letter-spacing:.08em}.gate-options{display:grid;grid-template-columns:repeat(2,minmax(120px,220px));gap:10px}.gate-btn{font-weight:750;font-size:1.05rem}.canvas-wrap{display:grid;place-items:center}.game-canvas{display:block;width:min(100%,760px);height:auto;aspect-ratio:16/9;border:1px solid var(--w2-line);border-radius:14px;background:#b9c4bd;touch-action:none}.layer-legend{display:flex;gap:12px;justify-content:center;color:var(--w2-muted);margin-top:10px}.swatch{width:12px;height:12px;border-radius:3px;display:inline-block;margin-right:4px}.swatch.a{background:#6f8e87}.swatch.b{background:#bb8d62}@media(max-width:620px){body{padding:78px 10px 16px}.wave2-panel{padding:16px;min-height:480px}.gate-options{grid-template-columns:1fr 1fr}.answer-row{flex-direction:column}.game-canvas{aspect-ratio:4/3}}@media(prefers-contrast:more){.game-cell,.controls 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