/* ── Design tokens ── */
:root{
  --bg:#0b1020; --bg-2:#0f172a;
  --panel:rgba(11,17,32,.74); --panel-2:rgba(255,255,255,.05);
  --border:rgba(255,255,255,.10); --border-strong:rgba(255,255,255,.20);
  --text:#f3f6fc; --muted:#8d99b6;
  --primary:#dc2626; --primary-2:#ff5a4d;
  --secondary:#2563eb; --secondary-2:#60a5fa;
  --accent:#22c55e; --amber:#fbbf24;
  --font-ar:'Cairo',system-ui,-apple-system,sans-serif;
  --font-num:'Orbitron','Cairo',ui-monospace,monospace;
  --radius:16px; --radius-sm:10px;
  --shadow:0 18px 50px rgba(0,0,0,.55);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  background:var(--bg); color:var(--text); font-family:var(--font-ar);
  overflow:hidden; overscroll-behavior:none; -webkit-font-smoothing:antialiased;
  -webkit-user-select:none; user-select:none; -webkit-tap-highlight-color:transparent;
}
#app{position:fixed;inset:0;overflow:hidden}
canvas#scene{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.hidden{display:none !important}
.center{text-align:center}
.glass{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  backdrop-filter:blur(16px) saturate(140%); -webkit-backdrop-filter:blur(16px) saturate(140%);
  box-shadow:var(--shadow);
}
.eyebrow{
  font-family:var(--font-num); font-size:.7rem; letter-spacing:.22em; text-transform:uppercase;
  color:var(--secondary-2); margin-bottom:.6rem;
}
.eyebrow.danger{color:var(--primary-2)}
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.5rem;
  padding:.85rem 1.9rem; border:0; border-radius:999px; font-family:inherit;
  font-size:1.02rem; font-weight:800; color:#fff; cursor:pointer;
  transition:transform .15s var(--ease),box-shadow .2s var(--ease),opacity .2s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0) scale(.98)}
.btn:focus-visible{outline:2px solid var(--secondary-2);outline-offset:3px}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));box-shadow:0 12px 34px rgba(220,38,38,.36)}
.btn-ghost{background:rgba(255,255,255,.06);border:1.5px solid var(--border-strong)}
.btn-row{display:flex;gap:.7rem;flex-wrap:wrap;justify-content:center;margin-top:1.4rem}
kbd{
  display:inline-block;min-width:1.9rem;padding:.16rem .45rem;border-radius:7px;
  background:rgba(255,255,255,.09);border:1px solid var(--border-strong);
  font-family:var(--font-num);font-size:.72rem;line-height:1.5;
}
.err{color:var(--primary-2);font-size:.85rem;margin-top:.8rem;line-height:1.7}