*,*:before,*:after{box-sizing:border-box}body{margin:0;overflow:hidden;font-family:Trebuchet MS,Segoe UI,sans-serif;background:radial-gradient(circle at top,rgba(109,244,255,.18),transparent 32%),radial-gradient(circle at bottom,rgba(255,142,92,.14),transparent 34%),linear-gradient(180deg,#07111f,#08162b 38%,#0c2032);color:#eef7ff}#pong-canvas{display:block;width:100vw;height:100vh}#start-overlay,#gameover-overlay{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#040a16d1;z-index:100}#start-overlay.hidden,#gameover-overlay.hidden,#hud.hidden,#wave-banner.hidden{display:none}#start-card,#gameover-card{width:min(92vw,540px);padding:38px 34px;border-radius:28px;text-align:center;background:#081325eb;border:1px solid rgba(125,227,255,.28);box-shadow:0 28px 80px #0000006b,inset 0 0 0 1px #ffffff0a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}#pong-logo{font-size:clamp(2.1rem,6vw,3.8rem);line-height:1.02;letter-spacing:.22em;text-transform:uppercase;color:#7fe8ff;text-shadow:0 0 18px rgba(127,232,255,.58);margin-bottom:18px}#start-tagline,#start-caption,#gameover-card p{margin:0 auto;max-width:34ch;line-height:1.65;color:#eef7ffc7}#start-tagline{font-size:clamp(.95rem,2vw,1.05rem);margin-bottom:20px}#start-caption{font-size:.94rem;margin-bottom:28px}.controls-hint{display:flex;flex-wrap:wrap;justify-content:center;gap:12px 18px;margin-bottom:18px}.controls-hint span{display:inline-flex;align-items:center;gap:6px;color:#ffcca8;font-size:.92rem}kbd{font:inherit;padding:5px 10px;border-radius:10px;background:#ffffff14;border:1px solid rgba(255,255,255,.12);color:#fff}#start-btn,#restart-btn{border:none;border-radius:999px;padding:14px 28px;background:linear-gradient(135deg,#7fe8ff,#ffad74);color:#08111b;font:inherit;font-weight:700;letter-spacing:.08em;text-transform:uppercase;cursor:pointer;box-shadow:0 12px 30px #7fe8ff38;transition:transform .12s ease,filter .12s ease}#start-btn:hover,#restart-btn:hover{transform:translateY(-1px) scale(1.03);filter:brightness(1.05)}#gameover-card h2{margin:0 0 12px;font-size:clamp(1.8rem,4vw,2.5rem);letter-spacing:.14em;color:#ffad74}#go-score{margin-bottom:10px}#go-hiscore{margin-bottom:24px}#hud{position:fixed;top:18px;left:50%;transform:translate(-50%);display:flex;flex-wrap:wrap;justify-content:center;gap:10px 14px;padding:12px 18px;border-radius:999px;background:#06101fb8;border:1px solid rgba(125,227,255,.18);box-shadow:0 16px 36px #00000047;z-index:50;pointer-events:none}#hud span{color:#eef7ff;font-size:.92rem;letter-spacing:.04em}#wave-banner{position:fixed;top:92px;left:50%;transform:translate(-50%);padding:12px 18px;text-align:center;border-radius:20px;background:#ffad7424;border:1px solid rgba(255,173,116,.28);box-shadow:0 12px 30px #00000038;z-index:50;pointer-events:none}#wave-banner-title{font-size:1.1rem;font-weight:700;letter-spacing:.16em;color:#ffcca8}#wave-banner-subtitle{margin-top:4px;font-size:.78rem;letter-spacing:.18em;color:#eef7ffb8}#home-link{position:fixed;left:18px;bottom:18px;z-index:50;text-decoration:none;color:#eef7ff;background:#071222c7;border:1px solid rgba(125,227,255,.22);border-radius:999px;padding:11px 16px;transition:transform .12s ease,background .12s ease}#home-link:hover{transform:translateY(-1px);background:#0a182ceb}body:after{content:"";position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;background:linear-gradient(to bottom,rgba(255,255,255,.035),transparent 16%),repeating-linear-gradient(to bottom,transparent 0,transparent 3px,rgba(0,0,0,.08) 3px,rgba(0,0,0,.08) 6px);opacity:.6}@media (max-width: 640px){#hud{top:10px;width:calc(100vw - 24px);border-radius:20px}#wave-banner{top:110px;width:calc(100vw - 52px)}#home-link{bottom:12px;left:12px}}