*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#EDEFF2;--surface:#FFFFFF;--surface-alt:#F7F8FA;--accent:#009CFF;--accent-warm:#FF6B6B;--accent-gold:#F5A623;--text:#1A2B3C;--text-muted:#6B8299;--border:#DDE1E6;--shadow:rgba(0,44,80,.06);--cell:clamp(44px,16vw,72px)}html,body{height:100%;overflow:hidden;background:var(--bg);font-family:Segoe UI,system-ui,-apple-system,sans-serif;color:var(--text);-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none;touch-action:manipulation}#app{display:flex;flex-direction:column;height:100%;max-width:900px;margin:0 auto;background:linear-gradient(180deg,#edeff2,#e5e8ec,#edeff2)}#header{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;background:linear-gradient(180deg,#fff,#fffffff2);border-bottom:2px solid var(--border);box-shadow:0 2px 12px #002c500f;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.title{font-size:14px;font-weight:800;letter-spacing:1px;color:var(--accent);text-transform:uppercase}.score{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:700}.score .label{opacity:.6;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.score .val{font-size:24px;font-weight:900;min-width:36px;text-align:center;transition:transform .15s;color:var(--text)}#player-score .val{color:var(--accent)}#ai-score .val{color:var(--accent-warm)}.score-pop .val{animation:scorePop .4s ease-out}@keyframes scorePop{0%{transform:scale(1.4);filter:brightness(1.4)}to{transform:scale(1);filter:brightness(1)}}#game-area{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;overflow:hidden;padding:8px}#game-canvas{display:block;max-width:100%;border-radius:16px;box-shadow:0 4px 24px var(--shadow)}#controls{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:10px 12px;width:100%;max-width:360px;position:relative;z-index:10;-webkit-tap-highlight-color:transparent}.ctrl-btn{background:linear-gradient(180deg,#009cff1f,#009cff0a);border:2px solid rgba(0,156,255,.2);color:var(--accent);font-size:24px;font-weight:700;border-radius:14px;padding:14px 0;cursor:pointer;transition:all .12s;-webkit-tap-highlight-color:transparent;box-shadow:0 2px 8px #009cff14}.ctrl-btn:active{background:var(--accent);border-color:var(--accent);color:#fff;transform:scale(.94);box-shadow:0 4px 16px #009cff4d}#rules{padding:10px 20px 12px;font-size:12px;line-height:1.6;color:var(--text-muted);text-align:center;background:#fff9;border-top:1px solid var(--border)}#rules strong{color:var(--accent);font-weight:700}#message-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#edeff2e0;display:flex;align-items:center;justify-content:center;z-index:100;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}#message-overlay.hidden{display:none}#message-box{background:#fff;border:2px solid var(--border);border-radius:24px;padding:36px 32px;text-align:center;max-width:360px;width:90%;box-shadow:0 8px 32px #002c501f}#message-title{font-size:40px;margin-bottom:12px}#message-text{font-size:15px;color:var(--text-muted);margin-bottom:28px;line-height:1.5}#message-btn{background:linear-gradient(135deg,var(--accent),#0078D4);color:#fff;border:none;padding:14px 44px;font-size:16px;font-weight:700;border-radius:14px;cursor:pointer;transition:all .15s;box-shadow:0 4px 16px #009cff4d;letter-spacing:.3px}#message-btn:active{transform:scale(.96);box-shadow:0 2px 8px #009cff33}@media (min-width:600px) and (hover:hover) and (pointer:fine){#controls{display:none}#rules{font-size:13px;padding:12px 24px}}