*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;overflow:hidden;background:#1a2332;font-family:Segoe UI,system-ui,sans-serif;touch-action:none;-webkit-user-select:none;user-select:none}#app{position:relative;width:100%;height:100%}#game{display:block;width:100%;height:100%}#hud{position:absolute;top:0;left:0;right:0;padding:max(12px,env(safe-area-inset-top)) 16px 0;pointer-events:none;z-index:2}#score{font-size:clamp(1.4rem,4vw,2rem);font-weight:700;color:#fff;text-shadow:0 2px 8px rgba(0,0,0,.55);letter-spacing:.04em;text-align:center}#overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0c121cb8;z-index:3;opacity:0;pointer-events:none;transition:opacity .2s ease}#overlay.visible{opacity:1;pointer-events:auto}.panel{text-align:center;padding:2rem 1.75rem;max-width:22rem;color:#f2f5f8}.panel h1{font-size:clamp(2.4rem,10vw,3.4rem);font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:#ffd166;text-shadow:0 3px 0 #c45c26}.tagline{margin-top:.15rem;font-size:1rem;letter-spacing:.35em;text-transform:uppercase;color:#8ecae6;opacity:.9}#overlay-msg{margin:1.25rem 0 1.5rem;font-size:1rem;line-height:1.4;color:#d7dee8}#start-btn{appearance:none;border:none;cursor:pointer;padding:.85rem 2.4rem;font-size:1.15rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#1a2332;background:linear-gradient(180deg,#ffd166,#f4a261);border-radius:8px;box-shadow:0 4px #c45c26;transition:transform .1s ease,box-shadow .1s ease}#start-btn:active{transform:translateY(3px);box-shadow:0 1px #c45c26}.hint{margin-top:1.25rem;font-size:.75rem;line-height:1.45;color:#8a97a8}.run-hit-flash{position:absolute;inset:0;z-index:4;pointer-events:none;opacity:0;background:radial-gradient(ellipse,#fff9ce14 30%,#ff6a49cc);box-shadow:inset 0 0 60px #ffe4a7a6}#sound-btn{position:absolute;top:max(12px,env(safe-area-inset-top));right:max(12px,env(safe-area-inset-right));z-index:5;min-height:44px;padding:0 12px;border:1px solid rgba(197,251,255,.45);border-radius:22px;background:#0f333ed9;color:#efffff;font:600 .8rem system-ui,sans-serif;cursor:pointer;touch-action:manipulation}#sound-btn[aria-pressed=true]{color:#c7d4d8}#sound-btn:focus-visible,#start-btn:focus-visible{outline:3px solid #fff0b4;outline-offset:4px}#sound-btn:disabled{opacity:.65;cursor:default}