:root{--bg: #1a1a1a;--fg: #f5f5f5;--accent: #4a9eff;--muted: #888;--card: #262626;--border: #3a3a3a}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0;padding:0;height:100%;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overscroll-behavior:none;touch-action:manipulation}#app{width:100%;height:100%}.splash{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;padding:2rem}.rotate-overlay{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:var(--bg);z-index:9999;align-items:center;justify-content:center;text-align:center;padding:2rem}.rotate-overlay--visible{display:flex}.rotate-overlay__icon{font-size:4rem;margin-bottom:1rem;animation:rotate-hint 2s ease-in-out infinite}@keyframes rotate-hint{0%,to{transform:rotate(0)}50%{transform:rotate(90deg)}}button,.btn{font:inherit;color:var(--fg);background:var(--card);border:1px solid var(--border);border-radius:.5rem;padding:.75rem 1.5rem;cursor:pointer;touch-action:manipulation}button:active,.btn:active{background:var(--border)}.btn-ghost{background:transparent}.screen{display:flex;flex-direction:column;height:100%;padding:1rem}.game-screen{gap:.75rem}.game-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;font-size:1.1rem}.game-next b{color:var(--accent);font-size:1.4rem}.game-timer{font-variant-numeric:tabular-nums;color:var(--muted)}.board{flex:1;display:grid;grid-template-columns:repeat(var(--cols, 10),1fr);grid-template-rows:repeat(var(--rows, 7),1fr);gap:.4rem;background:var(--border);padding:.4rem;border-radius:.75rem}.cell{display:flex;align-items:center;justify-content:center;background:var(--card);border:none;border-radius:.5rem;font-size:clamp(1.2rem,4vw,3rem);font-weight:600;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background .1s,transform .1s}.cell--done{background:#1f3a1f;opacity:.5}.cell--wrong{background:#5a1f1f;transform:scale(.97)}.result-screen{align-items:center;justify-content:center;gap:1.5rem;text-align:center}.score-big{display:flex;flex-direction:column;align-items:center}.score-num{font-size:5rem;font-weight:700;color:var(--accent);line-height:1}.score-label{color:var(--muted)}.score-note{font-size:.85rem}.metrics{list-style:none;padding:0;margin:0;width:100%;max-width:28rem;display:grid;grid-template-columns:1fr 1fr;gap:.5rem 1.5rem}.metrics li{display:flex;justify-content:space-between;padding:.4rem 0;border-bottom:1px solid var(--border)}.metrics span{color:var(--muted)}.result-actions{display:flex;gap:.75rem}.history-screen{gap:.75rem}.history-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.history-header h1{margin:0;font-size:1.4rem}.history-actions{display:flex;gap:.5rem;flex-wrap:wrap}.history-body{flex:1;overflow:auto}.history-empty{color:var(--muted);text-align:center;padding:2rem}.history-table{width:100%;border-collapse:collapse;font-size:.95rem}.history-table th,.history-table td{padding:.5rem .6rem;text-align:right;border-bottom:1px solid var(--border);font-variant-numeric:tabular-nums}.history-table th{color:var(--muted);font-weight:500;position:sticky;top:0;background:var(--bg)}.history-table th:first-child,.history-table td:first-child{text-align:left}.history-note{color:var(--muted);font-size:.8rem;margin-top:.5rem}