/* ============================================================
   NEON DRIVE 3D — design tokens
   Palette: neon red / electric blue on deep slate (arcade HUD)
   ============================================================ */
:root {
  --color-primary: #dc2626;
  --color-primary-hot: #ff4d4d;
  --color-secondary: #2563eb;
  --color-secondary-hot: #60a5fa;
  --color-accent: #22c55e;
  --color-background: #0f172a;
  --color-surface: #131c31;
  --color-muted: #1f1829;
  --color-foreground: #ffffff;
  --color-dim: #9aa8c7;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.18);

  --glass: rgba(255, 255, 255, 0.05);
  --glass-strong: rgba(15, 23, 42, 0.66);
  --blur: blur(14px);

  --font-display: "Orbitron", system-ui, sans-serif;
  --font-body: "Cairo", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
  --glow-primary: 0 0 24px rgba(220, 38, 38, 0.45);
  --glow-secondary: 0 0 24px rgba(37, 99, 235, 0.45);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-body);
  overflow: hidden;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}

body { position: fixed; inset: 0; }

#stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.is-hidden { display: none !important; }
.mono { font-family: var(--font-mono); }
.tiny { font-size: 12px; }
.muted { color: var(--color-dim); font-size: 15px; line-height: 1.7; }
.danger { color: var(--color-primary-hot); }

/* ---------- full-screen effects ---------- */
.fx { position: fixed; inset: 0; pointer-events: none; z-index: 5; }
.fx-vignette { background: radial-gradient(120% 90% at 50% 45%, transparent 42%, rgba(0, 0, 0, 0.62) 100%); }
.fx-scan {
  opacity: 0.16; mix-blend-mode: overlay;
  background: repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.06) 0 1px, transparent 1px 3px);
}
.fx-flash {
  background: radial-gradient(circle at 50% 60%, rgba(255, 90, 60, 0.75), rgba(220, 38, 38, 0) 62%);
  opacity: 0; transition: opacity 0.35s ease-out;
}
.fx-flash.on { opacity: 1; transition: opacity 60ms linear; }

/* ---------- overlays ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: radial-gradient(120% 100% at 50% 0%, rgba(37, 99, 235, 0.16), rgba(15, 23, 42, 0.92) 55%, #080c16 100%);
  backdrop-filter: var(--blur);
  animation: fadeIn 0.32s var(--ease) both;
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
@keyframes popIn { from { opacity: 0; transform: scale(0.94); } to { opacity: 1; transform: scale(1); } }
@keyframes spinRing { to { transform: rotate(360deg); } }
@keyframes pulseGlow { 50% { opacity: 0.45; } }
@keyframes shimmer { to { background-position: 200% 0; } }

/* ---------- loader ---------- */
.loader-box { text-align: center; width: min(420px, 92vw); animation: popIn 0.4s var(--ease) both; }
.loader-ring { position: relative; width: 92px; height: 92px; margin: 0 auto 22px; }
.loader-ring span {
  position: absolute; inset: 0; border-radius: 50%;
  border: 2px solid transparent; border-top-color: var(--color-primary-hot);
  animation: spinRing 1.1s linear infinite;
}
.loader-ring span:nth-child(2) { inset: 12px; border-top-color: var(--color-secondary-hot); animation-duration: 1.5s; animation-direction: reverse; }
.loader-ring span:nth-child(3) { inset: 24px; border-top-color: var(--color-accent); animation-duration: 1.9s; }
.brand-mini { font-family: var(--font-display); font-size: 22px; letter-spacing: 3px; }
.brand-mini span { color: var(--color-primary-hot); }
.bar { height: 4px; border-radius: 99px; background: rgba(255, 255, 255, 0.09); overflow: hidden; margin: 18px 0 10px; }
.bar i { display: block; height: 100%; width: 4%; border-radius: 99px; background: linear-gradient(90deg, var(--color-secondary), var(--color-primary-hot)); transition: width 0.3s var(--ease); }

/* ---------- menu card ---------- */
.menu-card {
  width: min(760px, 96vw);
  max-height: 94vh;
  overflow-y: auto;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: var(--blur);
  padding: clamp(20px, 3.4vw, 38px);
  display: grid;
  gap: 22px;
  animation: fadeUp 0.42s var(--ease) both;
}
.menu-card.small { width: min(520px, 94vw); gap: 16px; text-align: center; justify-items: center; }
.menu-head { display: grid; gap: 10px; text-align: center; }
.brand {
  font-family: var(--font-display); font-weight: 900;
  font-size: clamp(30px, 6.2vw, 56px); letter-spacing: 2px; line-height: 1;
  text-shadow: 0 0 26px rgba(220, 38, 38, 0.55);
}
.brand span { color: var(--color-primary-hot); }
.brand em {
  font-style: normal; font-family: var(--font-mono); font-size: 0.42em;
  color: var(--color-secondary-hot); padding: 3px 8px; margin-inline-start: 8px;
  border: 1px solid var(--color-secondary-hot); border-radius: 8px; vertical-align: middle;
}
.tagline { color: var(--color-dim); font-size: clamp(14px, 2.4vw, 17px); }
.h2 { font-family: var(--font-display); font-size: clamp(20px, 4vw, 28px); letter-spacing: 1px; }

/* ---------- fields / segmented control ---------- */
.field { display: grid; gap: 10px; }
.field-label { font-family: var(--font-mono); font-size: 12px; letter-spacing: 2px; text-transform: uppercase; color: var(--color-dim); }
.seg { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.seg button {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 52px; padding: 8px 10px; cursor: pointer;
  font-family: var(--font-body); font-weight: 700; font-size: 15px; color: var(--color-dim);
  background: rgba(255, 255, 255, 0.04); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); transition: all 0.22s var(--ease);
}
.seg button:hover { color: #fff; border-color: var(--color-border-strong); transform: translateY(-2px); }
.seg button.is-active {
  color: #fff; border-color: var(--color-primary);
  background: linear-gradient(180deg, rgba(220, 38, 38, 0.28), rgba(220, 38, 38, 0.1));
  box-shadow: var(--glow-primary);
}
.seg svg { width: 18px; height: 18px; }

/* ---------- key hints ---------- */
.keys { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; }
.keys > div {
  display: flex; align-items: center; gap: 6px; padding: 10px 12px;
  background: rgba(255, 255, 255, 0.03); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); font-size: 14px; color: var(--color-dim);
}
.keys span { margin-inline-start: auto; }
kbd {
  font-family: var(--font-mono); font-size: 12px; min-width: 26px; text-align: center;
  padding: 4px 6px; color: #fff; background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--color-border-strong); border-bottom-width: 2px; border-radius: 6px;
}

/* ---------- buttons ---------- */
.menu-cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 0 24px; cursor: pointer;
  font-family: var(--font-body); font-weight: 800; font-size: 16px; color: #fff;
  border: 1px solid var(--color-border-strong); border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), background 0.22s var(--ease);
}
.btn:hover { transform: translateY(-2px); background: rgba(255, 255, 255, 0.09); }
.btn:active { transform: translateY(0) scale(0.99); }
.btn svg { width: 19px; height: 19px; }
.btn small { font-family: var(--font-mono); opacity: 0.75; font-size: 12px; }
.btn-primary {
  background: linear-gradient(180deg, var(--color-primary-hot), var(--color-primary));
  border-color: rgba(255, 255, 255, 0.22); box-shadow: var(--glow-primary);
  font-size: 17px; padding: 0 32px;
}
.btn-primary:hover { background: linear-gradient(180deg, #ff6b6b, var(--color-primary-hot)); }
.btn-ghost { color: var(--color-dim); }
.btn-ghost:hover { color: #fff; }
:focus-visible { outline: 2px solid var(--color-secondary-hot); outline-offset: 3px; }

.menu-foot {
  display: flex; flex-wrap: wrap; gap: 10px 22px; justify-content: center;
  font-size: 13px; color: var(--color-dim); border-top: 1px solid var(--color-border); padding-top: 14px;
}
.menu-foot svg { width: 14px; height: 14px; vertical-align: -2px; }
.menu-foot b { color: var(--color-accent); font-family: var(--font-mono); }

/* ---------- HUD ---------- */
.hud {
  position: fixed; inset: 0; z-index: 10; pointer-events: none;
  padding: clamp(10px, 2vw, 20px);
  display: grid; grid-template-columns: 1fr auto auto; gap: 12px; align-items: start;
}
.hud-panel {
  background: var(--glass-strong); border: 1px solid var(--color-border);
  border-radius: var(--radius); backdrop-filter: var(--blur); box-shadow: var(--shadow);
}
.hud-stats { display: flex; gap: clamp(10px, 2vw, 26px); padding: 10px 16px; }
.stat { display: grid; gap: 2px; }
.stat-label { font-family: var(--font-mono); font-size: 10px; letter-spacing: 1.6px; color: var(--color-dim); text-transform: uppercase; }
.stat strong { font-family: var(--font-display); font-size: clamp(16px, 3.4vw, 24px); line-height: 1.1; }
.stat strong small { font-family: var(--font-body); font-size: 11px; color: var(--color-dim); margin-inline-start: 3px; }
#statScore { color: var(--color-accent); }
#statBest { color: var(--color-secondary-hot); }

.hud-speed { position: relative; width: clamp(104px, 15vw, 132px); aspect-ratio: 1; display: grid; place-items: center; }
.dial { position: absolute; inset: 0; width: 100%; height: 100%; transform: rotate(0deg); }
.dial-track, .dial-fill { fill: none; stroke-width: 7; stroke-linecap: round; transform: rotate(135deg); transform-origin: 60px 60px; }
.dial-track { stroke: rgba(255, 255, 255, 0.1); stroke-dasharray: 236 314; }
.dial-fill {
  stroke: url(#none); stroke: var(--color-primary-hot); stroke-dasharray: 0 314;
  filter: drop-shadow(0 0 6px rgba(255, 77, 77, 0.85));
  transition: stroke-dasharray 0.12s linear, stroke 0.3s linear;
}
.dial-needle { stroke: #fff; stroke-width: 2.5; stroke-linecap: round; }
.dial-hub { fill: #fff; }
.dial-tick { stroke: rgba(255, 255, 255, 0.28); stroke-width: 2; }
.speed-read { position: relative; display: grid; justify-items: center; line-height: 1; }
.speed-read strong { font-family: var(--font-display); font-size: clamp(20px, 4vw, 28px); }
.speed-read span { font-family: var(--font-mono); font-size: 9px; letter-spacing: 1.5px; color: var(--color-dim); }

.hud-actions { display: flex; gap: 8px; pointer-events: auto; }
.icon-btn {
  width: 44px; height: 44px; display: grid; place-items: center; cursor: pointer; color: #fff;
  background: var(--glass-strong); border: 1px solid var(--color-border);
  border-radius: 12px; backdrop-filter: var(--blur);
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}
.icon-btn:hover { transform: translateY(-2px); background: rgba(255, 255, 255, 0.12); }
.icon-btn.is-off { color: var(--color-dim); }
.icon-btn svg { width: 20px; height: 20px; }

/* ---------- combo / warnings / toast ---------- */
.combo {
  position: fixed; z-index: 11; left: 50%; top: 16%; transform: translateX(-50%) scale(0.9);
  display: grid; justify-items: center; gap: 2px; pointer-events: none;
  opacity: 0; transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}
.combo.on { opacity: 1; transform: translateX(-50%) scale(1); }
.combo b {
  font-family: var(--font-display); font-size: clamp(30px, 7vw, 52px); color: var(--color-accent);
  text-shadow: 0 0 22px rgba(34, 197, 94, 0.6);
}
.combo small { font-family: var(--font-mono); font-size: 11px; letter-spacing: 2px; color: var(--color-dim); }

.warn {
  position: fixed; z-index: 12; left: 50%; top: 8%; transform: translateX(-50%);
  display: flex; align-items: center; gap: 8px; padding: 8px 18px;
  font-family: var(--font-body); font-weight: 800; color: #fff;
  background: rgba(220, 38, 38, 0.24); border: 1px solid var(--color-primary-hot);
  border-radius: 99px; box-shadow: var(--glow-primary); animation: pulseGlow 1s ease-in-out infinite;
}
.warn svg { width: 18px; height: 18px; }

.toast {
  position: fixed; z-index: 13; left: 50%; bottom: 22%; transform: translate(-50%, 10px);
  padding: 10px 20px; font-weight: 700; font-size: 14px; color: #fff;
  background: var(--glass-strong); border: 1px solid var(--color-border-strong);
  border-radius: 99px; backdrop-filter: var(--blur);
  opacity: 0; pointer-events: none; transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }

.speedlines {
  position: fixed; inset: 0; z-index: 6; pointer-events: none; opacity: 0;
  background:
    radial-gradient(closest-side at 50% 50%, transparent 52%, rgba(255, 255, 255, 0.1) 100%),
    repeating-conic-gradient(from 0deg at 50% 55%, rgba(255, 255, 255, 0.07) 0deg 1.2deg, transparent 1.2deg 12deg);
  transition: opacity 0.4s linear;
}

/* ---------- touch controls ---------- */
.touch { position: fixed; inset: auto 0 0 0; z-index: 14; padding: 14px 16px 20px; display: flex; gap: 12px; }
.touch .tbtn {
  flex: 1; min-height: 74px; display: grid; place-items: center; cursor: pointer; color: #fff;
  background: var(--glass-strong); border: 1px solid var(--color-border-strong);
  border-radius: var(--radius); backdrop-filter: var(--blur); touch-action: none;
  transition: background 0.15s linear, transform 0.15s linear;
}
.touch .tbtn.is-down { background: rgba(255, 255, 255, 0.22); transform: scale(0.97); }
.touch .tbtn svg { width: 28px; height: 28px; }
.tbtn-gas { color: var(--color-accent); }
.tbtn-brake { color: var(--color-primary-hot); }
@media (hover: hover) and (pointer: fine) { .touch { display: none; } }

/* ---------- game over ---------- */
.crash-badge {
  width: 66px; height: 66px; display: grid; place-items: center; color: var(--color-primary-hot);
  background: rgba(220, 38, 38, 0.16); border: 1px solid var(--color-primary);
  border-radius: 50%; box-shadow: var(--glow-primary);
}
.crash-badge svg { width: 30px; height: 30px; }
.grid-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(112px, 1fr)); gap: 10px; width: 100%;
}
.grid-stats > div {
  display: grid; gap: 3px; padding: 12px 10px; text-align: center;
  background: rgba(255, 255, 255, 0.04); border: 1px solid var(--color-border); border-radius: var(--radius-sm);
}
.grid-stats span { font-family: var(--font-mono); font-size: 10px; letter-spacing: 1.2px; color: var(--color-dim); }
.grid-stats b { font-family: var(--font-display); font-size: 20px; }
.grid-stats b small { font-family: var(--font-body); font-size: 10px; color: var(--color-dim); }
.record {
  display: flex; align-items: center; gap: 8px; padding: 8px 16px; font-weight: 800;
  color: #0f172a; background: linear-gradient(90deg, #fde68a, #fbbf24);
  border-radius: 99px; animation: pulseGlow 1.4s ease-in-out infinite;
}
.record svg { width: 18px; height: 18px; }

/* ---------- RTL / typography safety ---------- */
html[dir="ltr"] .stat-label, html[dir="ltr"] .field-label { letter-spacing: 2px; }
html[dir="ltr"] .combo b, html[dir="ltr"] .dial-needle { transform-origin: 60px 60px; }

/* ---------- responsive ---------- */
@media (max-width: 720px) {
  .hud { grid-template-columns: 1fr auto; grid-template-areas: "stats actions" "speed speed"; gap: 8px; padding: 10px; }
  .hud-stats { grid-area: stats; }
  .hud-actions { grid-area: actions; }
  .hud-speed { grid-area: speed; justify-self: end; margin-top: -6px; }
  .brand { font-size: clamp(26px, 9vw, 40px); }
  .seg { grid-template-columns: 1fr; }
  .keys { grid-template-columns: 1fr 1fr; }
  .keys > div { padding: 8px 10px; font-size: 13px; }
  .menu-card { gap: 16px; padding: 18px; }
  .combo { top: 22%; }
}
@media (max-width: 420px) {
  .stat strong { font-size: 15px; }
  .btn { min-height: 48px; padding: 0 16px; font-size: 15px; }
  .touch .tbtn { min-height: 64px; }
}
@media (min-width: 1100px) { .hud { padding: 22px 26px; } }

@media (prefers-reduced-motion: reduce) {
  .loader-ring span, .record, .warn { animation: none; }
  .overlay, .menu-card { animation-duration: 0.01ms; }
  .fx-scan { display: none; }
}