:root{
  --bg:#05030f;
  --neon:#ff2e97;
  --cyan:#00f0ff;
  --violet:#8b5cf6;
  --gold:#ffd166;
  --lime:#4ade80;
  --ink:#eaf0ff;
  --muted:#8b93b8;
  --glass:rgba(255,255,255,.055);
  --stroke:rgba(140,170,255,.18);
  --font-num:'Orbitron',system-ui,sans-serif;
  --font-ui:'Rajdhani','Cairo',system-ui,sans-serif;
  --font-ar:'Cairo',system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%;overflow:hidden;background:var(--bg);color:var(--ink);
  font-family:var(--font-ar);-webkit-font-smoothing:antialiased;
  overscroll-behavior:none;touch-action:none}
#scene{position:fixed;inset:0;width:100%;height:100%;display:block;z-index:1}
#vignette{position:fixed;inset:0;z-index:2;pointer-events:none;
  background:radial-gradient(ellipse at 50% 45%,transparent 38%,rgba(5,3,15,.82) 100%)}
#impact{position:fixed;inset:0;z-index:3;pointer-events:none;opacity:0;
  background:radial-gradient(ellipse at 50% 60%,rgba(255,46,151,.5),transparent 70%)}
.hidden{display:none !important}

/* ---------- HUD ---------- */
#hud{position:fixed;inset:0;z-index:5;pointer-events:none;
  padding:max(14px,env(safe-area-inset-top)) 16px 14px}
.hud-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.hud-box{background:var(--glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--stroke);border-radius:14px;padding:8px 14px;min-width:104px;
  display:flex;flex-direction:column;align-items:center;gap:2px}
.hud-box .lbl{font-size:11px;letter-spacing:.16em;color:var(--muted);text-transform:uppercase}
.hud-box .val{font-family:var(--font-num);font-weight:700;font-size:26px;line-height:1;
  color:#fff;text-shadow:0 0 14px rgba(0,240,255,.65)}
.hud-box .val.small{font-size:18px;color:var(--gold);text-shadow:0 0 12px rgba(255,209,102,.55)}
.combo{font-family:var(--font-num);font-weight:900;font-size:34px;color:#fff;
  text-shadow:0 0 20px var(--neon),0 0 44px var(--neon);align-self:center;
  transform:scale(1);transition:transform .12s ease}
.combo.pop{transform:scale(1.35)}
.hud-mid{position:absolute;left:0;right:0;bottom:max(14px,env(safe-area-inset-bottom));padding:0 16px}
.speedbar{height:7px;border-radius:99px;background:rgba(255,255,255,.09);overflow:hidden;
  border:1px solid var(--stroke)}
.speedbar i{display:block;height:100%;width:0%;border-radius:99px;
  background:linear-gradient(90deg,var(--cyan),var(--violet),var(--neon));
  box-shadow:0 0 16px rgba(0,240,255,.7);transition:width .2s linear}
.stats{display:flex;gap:18px;justify-content:center;margin-top:8px;
  font-size:13px;letter-spacing:.06em;color:var(--muted);font-family:var(--font-ui)}
.stats b{color:#fff;font-family:var(--font-num);font-size:15px}
#tier{color:var(--cyan)}
.hint{text-align:center;margin-top:6px;font-size:11.5px;color:rgba(139,147,184,.72);letter-spacing:.08em}
.powers{position:absolute;top:96px;left:16px;display:flex;flex-direction:column;gap:8px}
.pwr{display:flex;align-items:center;gap:8px;background:var(--glass);border:1px solid var(--stroke);
  border-radius:12px;padding:6px 10px;backdrop-filter:blur(12px);font-size:12.5px;min-width:112px}
.pwr .bar{flex:1;height:5px;border-radius:99px;background:rgba(255,255,255,.14);overflow:hidden}
.pwr .bar i{display:block;height:100%;border-radius:99px}
.pwr .nm{font-weight:700;letter-spacing:.04em}

/* ---------- Overlays ---------- */
.overlay{position:fixed;inset:0;z-index:8;display:grid;place-items:center;padding:20px;
  background:radial-gradient(ellipse at 50% 30%,rgba(24,10,54,.82),rgba(4,2,12,.94));
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);animation:fadeIn .35s ease}
.panel{width:min(560px,100%);max-height:92vh;overflow-y:auto;touch-action:pan-y;
  -webkit-overflow-scrolling:touch;text-align:center;
  background:linear-gradient(160deg,rgba(255,255,255,.075),rgba(255,255,255,.02));
  border:1px solid var(--stroke);border-radius:26px;padding:28px 24px;
  box-shadow:0 32px 90px rgba(0,0,0,.6),inset 0 1px 0 rgba(255,255,255,.09);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);animation:rise .45s cubic-bezier(.2,.9,.25,1)}
.panel.small{width:min(360px,100%)}
.logo h1{font-family:var(--font-num);font-weight:900;font-size:clamp(38px,11vw,62px);
  line-height:1;letter-spacing:-.02em;color:#fff;text-shadow:0 0 26px rgba(0,240,255,.5)}
.logo h1 span{color:var(--neon);text-shadow:0 0 30px var(--neon),0 0 60px rgba(255,46,151,.6)}
.logo .sub{margin-top:10px;font-family:var(--font-ui);font-size:12.5px;letter-spacing:.34em;
  color:var(--cyan);text-transform:uppercase}
.lead{margin:18px auto 20px;max-width:420px;font-size:14.5px;line-height:1.9;color:#c3cbe8}
h2{font-family:var(--font-ar);font-weight:800;font-size:clamp(24px,6vw,32px);margin-bottom:8px}
.keys-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 auto 22px;max-width:460px}
.keys-grid div{display:flex;align-items:center;gap:8px;justify-content:center;
  background:rgba(255,255,255,.04);border:1px solid var(--stroke);border-radius:12px;
  padding:9px 10px;font-size:12.5px;color:#c3cbe8}
kbd{font-family:var(--font-num);font-size:11px;font-weight:700;background:rgba(0,240,255,.12);
  border:1px solid rgba(0,240,255,.35);border-radius:7px;padding:3px 7px;color:var(--cyan);
  box-shadow:0 2px 0 rgba(0,240,255,.18)}

/* ---------- Buttons ---------- */
.btn{display:block;width:100%;margin:10px 0 0;padding:15px 20px;border:0;cursor:pointer;
  border-radius:16px;font-family:var(--font-ar);font-weight:800;font-size:16.5px;color:#fff;
  transition:transform .16s ease,box-shadow .16s ease,background .16s ease}
.btn.primary{background:linear-gradient(100deg,var(--neon),var(--violet) 55%,var(--cyan));
  box-shadow:0 14px 40px rgba(255,46,151,.38);position:relative;overflow:hidden}
.btn.primary:hover{transform:translateY(-2px) scale(1.012);
  box-shadow:0 20px 55px rgba(255,46,151,.5)}
.btn.primary:active{transform:translateY(0) scale(.99)}
.btn.ghost{background:rgba(255,255,255,.05);border:1px solid var(--stroke);font-size:14px;
  font-weight:600;color:#c3cbe8;padding:12px 18px}
.btn.ghost:hover{background:rgba(255,255,255,.1);transform:translateY(-1px)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}
.row .btn{margin:0}
.bestline{margin-top:16px;font-size:13px;color:var(--muted)}
.bestline b{color:var(--gold);font-family:var(--font-num)}

/* ---------- Scoreboard ---------- */
.scoreboard{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:20px 0 8px}
.scoreboard>div{background:rgba(255,255,255,.04);border:1px solid var(--stroke);
  border-radius:16px;padding:13px 10px;display:flex;flex-direction:column;gap:4px;align-items:center}
.scoreboard .k{font-size:11.5px;letter-spacing:.12em;color:var(--muted)}
.scoreboard b{font-family:var(--font-num);font-size:23px;font-weight:700;color:#fff}
.scoreboard b.big{font-size:34px;color:var(--cyan);text-shadow:0 0 20px rgba(0,240,255,.6)}
.scoreboard .u{font-size:11px;color:var(--muted)}
.record{margin:14px 0 0;font-weight:800;font-size:15px;color:var(--gold);
  animation:blink 1.1s ease-in-out infinite;text-shadow:0 0 18px rgba(255,209,102,.6)}

/* ---------- Toast / Loader ---------- */
#toast{position:fixed;top:18px;left:50%;transform:translateX(-50%) translateY(-24px);
  z-index:9;background:rgba(10,6,26,.92);border:1px solid var(--stroke);border-radius:14px;
  padding:11px 20px;font-family:var(--font-ar);font-weight:700;font-size:15px;color:#fff;
  opacity:0;pointer-events:none;transition:opacity .3s,transform .3s;white-space:nowrap}
#toast.on{opacity:1;transform:translateX(-50%) translateY(0)}
#loader{position:fixed;inset:0;z-index:10;display:grid;place-items:center;align-content:center;
  gap:16px;background:var(--bg);transition:opacity .5s ease}
#loader.gone{opacity:0;pointer-events:none}
#loader span{font-size:13px;letter-spacing:.18em;color:var(--muted)}
.ring{width:54px;height:54px;border-radius:50%;border:3px solid rgba(255,255,255,.1);
  border-top-color:var(--neon);border-right-color:var(--cyan);animation:spin .9s linear infinite}

/* ---------- Animation ---------- */
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes rise{from{opacity:0;transform:translateY(26px) scale(.97)}to{opacity:1;transform:none}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes blink{50%{opacity:.45}}
@keyframes pulseBtn{0%,100%{box-shadow:0 14px 40px rgba(255,46,151,.38)}
  50%{box-shadow:0 14px 52px rgba(0,240,255,.5)}}
#play{animation:pulseBtn 2.4s ease-in-out infinite}

/* ---------- Responsive ---------- */
@media (max-width:640px){
  .panel{padding:22px 16px;border-radius:22px}
  .hud-box{min-width:86px;padding:6px 10px}
  .hud-box .val{font-size:20px}
  .hud-box .val.small{font-size:15px}
  .combo{font-size:26px}
  .powers{top:86px;left:10px}
  .pwr{min-width:96px;padding:5px 8px;font-size:11px}
  .keys-grid{grid-template-columns:1fr;gap:7px}
  .stats{gap:12px;font-size:11.5px}
  .hint{display:none}
}
@media (max-height:520px) and (orientation:landscape){
  .panel{padding:16px 18px;max-height:96vh}
  .logo h1{font-size:34px}
  .lead{display:none}
  .keys-grid{grid-template-columns:1fr 1fr 1fr 1fr;gap:6px;margin-bottom:12px}
  .keys-grid div{font-size:10.5px;padding:6px 4px}
  kbd{font-size:10px;padding:2px 5px}
  .btn{padding:11px 16px;font-size:14.5px}
  .scoreboard{grid-template-columns:1fr 1fr 1fr 1fr}
}