:root{--panel-bg: rgba(10, 16, 38, .72);--accent: #5be0a0;--accent-2: #2b6cff;font-family:Trebuchet MS,Segoe UI,system-ui,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:#05070f;color:#f4f7ff;overflow:hidden;-webkit-user-select:none;user-select:none;touch-action:none}.app{height:100%;display:grid;place-items:center;background:radial-gradient(circle at 50% -10%,#1a2350,#05070f 70%);padding:12px}.stage{position:relative;height:min(96vh,92vw * 720 / 440);aspect-ratio:440 / 720;border-radius:22px;overflow:hidden;box-shadow:0 24px 60px #0000008c,0 0 0 1px #ffffff0f}.game-canvas{display:block;width:100%;height:100%}.hud{position:absolute;top:0;left:0;right:0;padding:16px 18px;pointer-events:none;text-shadow:0 2px 6px rgba(0,0,0,.5)}.hud-altitude{font-size:38px;font-weight:800;letter-spacing:-1px;line-height:1}.hud-altitude span{font-size:18px;font-weight:600;opacity:.8}.hud-best{margin-top:4px;font-size:14px;font-weight:600;opacity:.75}.hud-kills{opacity:.95}.kills-line{margin:10px 0 0;font-size:14px;font-weight:700;opacity:.85}.controls-corner{position:absolute;top:16px;right:16px;display:flex;gap:8px;z-index:5}.icon-btn{width:42px;height:42px;padding:0;border-radius:12px;border:1px solid rgba(255,255,255,.18);background:#0a102680;color:#f4f7ff;font-size:18px;font-weight:800;line-height:1;cursor:pointer;pointer-events:auto;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);transition:transform .08s ease,filter .15s ease}.icon-btn:hover{filter:brightness(1.2)}.icon-btn:active{transform:scale(.94)}.toast{position:absolute;top:96px;left:50%;transform:translate(-50%);white-space:nowrap;padding:8px 16px;border-radius:999px;background:linear-gradient(90deg,var(--accent-2),var(--accent));color:#051018;font-weight:800;font-size:15px;box-shadow:0 8px 24px #2b6cff73;animation:pop .35s ease}@keyframes pop{0%{transform:translate(-50%) scale(.7);opacity:0}to{transform:translate(-50%) scale(1);opacity:1}}.overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;background:#05070f73;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);animation:fade .25s ease}@keyframes fade{0%{opacity:0}to{opacity:1}}.panel{width:84%;max-width:340px;padding:28px 24px;text-align:center;background:var(--panel-bg);border:1px solid rgba(255,255,255,.1);border-radius:20px;box-shadow:0 18px 50px #00000080}.title{margin:0;font-size:44px;font-weight:900;letter-spacing:-1.5px;background:linear-gradient(180deg,#fff,#9ec5ff);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:0 4px 20px rgba(94,165,255,.4)}.title.small{font-size:30px}.subtitle{margin:6px 0 18px;font-size:15px;opacity:.85;font-weight:600}.controls{font-size:13px;line-height:1.7;opacity:.82;margin-bottom:20px}.controls p{margin:2px 0}kbd{display:inline-block;min-width:22px;padding:2px 6px;border-radius:6px;background:#ffffff1f;border:1px solid rgba(255,255,255,.2);font-family:inherit;font-weight:700;font-size:12px}.btn{width:100%;padding:14px;border:none;border-radius:14px;background:linear-gradient(90deg,var(--accent-2),var(--accent));color:#051018;font-size:18px;font-weight:800;cursor:pointer;transition:transform .08s ease,filter .15s ease}.btn:hover{filter:brightness(1.08)}.btn:active{transform:scale(.97)}.btn+.btn{margin-top:10px}.btn-ghost{background:#ffffff14;color:#f4f7ff;border:1px solid rgba(255,255,255,.18)}.hint{margin:14px 0 0;font-size:13px;opacity:.6}.score-row{display:flex;gap:14px;margin:14px 0 8px}.score{flex:1;padding:14px 8px;border-radius:14px;background:#ffffff0f;display:flex;flex-direction:column;gap:4px}.score-num{font-size:30px;font-weight:900;letter-spacing:-1px}.score-label{font-size:11px;text-transform:uppercase;letter-spacing:1px;opacity:.6}.new-best{margin:6px 0 16px;font-weight:800;color:var(--accent)}