:root{--bg-top: #262830;--bg-bot: #15161b;--ink: #ececec;--ink-soft: #9aa0a8;--accent: #f2c14e;--accent-2: #e0a93b;--btn: #2a2c33;--btn-hover: #34373f;--shadow: 0 6px 18px rgba(0, 0, 0, .4)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:linear-gradient(180deg,var(--bg-top),var(--bg-bot));overflow:hidden;user-select:none;-webkit-user-select:none}#app{display:flex;flex-direction:column;height:100dvh;max-width:720px;margin:0 auto;padding:env(safe-area-inset-top) 10px env(safe-area-inset-bottom)}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 6px 8px;gap:10px}.brand h1{font-size:22px;font-weight:800;letter-spacing:1px;color:var(--accent-2)}.brand .tagline{font-size:11px;color:var(--ink-soft)}.stats{display:flex;gap:10px}.stat{display:flex;flex-direction:column;align-items:center;min-width:44px;padding:4px 6px;background:#ffffff0f;border-radius:12px;box-shadow:var(--shadow)}.stat span{font-size:17px;font-weight:700;color:var(--ink);line-height:1.1}.stat label{font-size:10px;color:var(--ink-soft);margin-top:1px}.board-wrap{position:relative;flex:1;display:flex;align-items:center;justify-content:center;min-height:0;margin:4px 0}#board{display:block;border-radius:16px;box-shadow:var(--shadow);touch-action:none}.toolbar{display:flex;gap:8px;padding:8px 4px 6px}.btn{flex:1;padding:12px 8px;font-size:15px;font-weight:600;color:var(--ink);background:var(--btn);border:none;border-radius:14px;box-shadow:var(--shadow);cursor:pointer;transition:transform .08s ease,background .15s ease}.btn:active{transform:translateY(1px) scale(.98);background:var(--btn-hover)}#btn-sound{flex:0 0 54px;font-size:18px}.btn.primary{color:#20211a;font-weight:800;background:linear-gradient(180deg,var(--accent),var(--accent-2))}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0009;backdrop-filter:blur(3px);border-radius:16px;z-index:5;animation:fade .25s ease}.overlay.hidden{display:none}.overlay-card{background:#23252b;padding:28px 24px;border-radius:20px;text-align:center;max-width:80%;box-shadow:0 12px 40px #00000080;animation:pop .3s cubic-bezier(.2,1.3,.5,1)}.overlay-card h2{font-size:24px;color:var(--accent);margin-bottom:10px}.overlay-card p{font-size:15px;color:var(--ink-soft);line-height:1.6;margin-bottom:18px}.overlay-card .btn{min-width:160px;flex:none}.toast{position:absolute;bottom:16px;left:50%;transform:translate(-50%) translateY(12px);padding:8px 16px;background:#000000d9;color:#fff;font-size:13px;border-radius:20px;opacity:0;pointer-events:none;transition:opacity .2s ease,transform .2s ease;z-index:6}.toast.show{opacity:1;transform:translate(-50%) translateY(0)}@keyframes fade{0%{opacity:0}}@keyframes pop{0%{transform:scale(.85);opacity:0}}@media(orientation:landscape)and (max-height:520px){.brand .tagline{display:none}.topbar{padding:4px 6px}}