*{box-sizing:border-box}
html,body{margin:0;padding:0;height:100%}
body{background:#07020f;color:#e8f6ff;font-family:'Segoe UI',system-ui,-apple-system,'Helvetica Neue',Arial,sans-serif;overflow:hidden;overscroll-behavior:none;-webkit-tap-highlight-color:transparent;touch-action:manipulation}
#app{position:fixed;inset:0;display:flex;flex-direction:column;overflow:hidden}

canvas#game{position:absolute;inset:0;width:100%;height:100%;display:block}

.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
[hidden]{display:none!important}

/* HUD */
.hud{position:relative;z-index:10;display:flex;gap:10px;align-items:center;padding:calc(10px + env(safe-area-inset-top)) 16px 10px;font-variant-numeric:tabular-nums;pointer-events:none}
.hud-item{display:flex;flex-direction:column;gap:0;min-width:74px}
.hud-item.hud-center{flex:1;align-items:center}
.hud-label{font-size:10px;letter-spacing:.28em;color:#7fe3ff;opacity:.65}
.hud-value{font-size:26px;font-weight:800;color:#eafcff;text-shadow:0 0 12px rgba(64,220,255,.75)}
.mute-btn{pointer-events:auto;margin-left:auto;width:40px;height:40px;border-radius:12px;border:1px solid rgba(127,227,255,.35);background:rgba(14,8,30,.55);color:#7fe3ff;font-size:18px;cursor:pointer}
.mute-btn[aria-pressed="true"]{opacity:.5;text-decoration:line-through}

/* Lane indicator */
.lane-indicator{position:absolute;bottom:96px;left:50%;transform:translateX(-50%);z-index:9;font-size:11px;letter-spacing:.3em;color:#ff4fd8;text-shadow:0 0 10px rgba(255,79,216,.8);opacity:.85;pointer-events:none}

/* Overlays */
.overlay{position:absolute;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(120% 90% at 50% 0%,rgba(20,8,42,.55),rgba(5,2,12,.88));backdrop-filter:blur(3px)}
.overlay-inner{width:min(440px,100%);text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px;animation:rise .35s ease both}
@keyframes rise{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.title{font-size:clamp(40px,10vw,64px);line-height:.9;letter-spacing:.06em;margin:0;font-weight:900;color:#eafcff;text-shadow:0 0 22px rgba(64,220,255,.8),0 0 4px #fff}
.title span{display:block;color:#ff4fd8;text-shadow:0 0 22px rgba(255,79,216,.8)}
.tagline{color:#b8d6e8;opacity:.85;margin:0;font-size:15px}
.overlay-title{font-size:34px;margin:0;letter-spacing:.12em;color:#7fe3ff;text-shadow:0 0 18px rgba(127,227,255,.7)}
.overlay-title.danger{color:#ff5d8f;text-shadow:0 0 18px rgba(255,93,143,.7)}
.overlay-sub{color:#b8d6e8;opacity:.8;margin:0}
.controls-list{display:flex;flex-direction:column;gap:6px;font-size:13px;color:#b8d6e8;opacity:.9}
.controls-list p{margin:0}
kbd{display:inline-block;min-width:22px;padding:2px 7px;border-radius:6px;border:1px solid rgba(127,227,255,.4);background:rgba(127,227,255,.08);font-family:inherit;font-size:12px;color:#7fe3ff}
.final-score{font-size:22px;margin:0;color:#eafcff}
.final-score strong{color:#ff4fd8;font-size:30px;text-shadow:0 0 14px rgba(255,79,216,.7)}
.final-best{margin:0;color:#b8d6e8;opacity:.85}
.final-best strong{color:#7fe3ff}
.new-best{color:#ffe66b;letter-spacing:.2em;font-size:14px;text-shadow:0 0 12px rgba(255,230,107,.8)}

/* Buttons */
.btn{font:inherit;font-weight:800;letter-spacing:.08em;border-radius:14px;padding:14px 30px;cursor:pointer;border:0;transition:transform .12s ease,box-shadow .12s ease;min-width:200px}
.btn:focus-visible,.touch-btn:focus-visible,.mute-btn:focus-visible{outline:2px solid #ffe66b;outline-offset:3px}
.btn-primary{background:linear-gradient(180deg,#27e0ff,#08a9d6);color:#04121a;box-shadow:0 0 24px rgba(39,224,255,.45)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-ghost{background:transparent;color:#b8d6e8;border:1px solid rgba(127,227,255,.35)}
.btn-ghost:hover{border-color:#7fe3ff}

/* Touch controls */
.touch-controls{position:absolute;z-index:30;left:0;right:0;bottom:calc(10px + env(safe-area-inset-bottom));display:flex;gap:14px;justify-content:center;align-items:center;pointer-events:none}
.touch-btn{pointer-events:auto;width:74px;height:74px;border-radius:22px;border:1px solid rgba(127,227,255,.4);background:rgba(14,8,30,.6);color:#7fe3ff;font-size:30px;font-weight:900;cursor:pointer;touch-action:manipulation;user-select:none;-webkit-user-select:none}
.touch-btn:active{background:rgba(39,224,255,.25)}
.touch-jump{height:92px;color:#ff4fd8;border-color:rgba(255,79,216,.4)}
@media (min-width:641px) and (pointer:fine){.touch-controls{display:none}}

@media (prefers-reduced-motion:reduce){.overlay-inner{animation:none}}