:root {
  --bg-deep: #050510;
  --bg-panel: rgba(10, 10, 26, 0.72);
  --c-teal: #00f5e1;
  --c-purple: #bc13fe;
  --c-gold: #ffd600;
  --c-rose: #ff2a6d;
  --c-ice: #e0f7ff;
  --c-dim: rgba(224, 247, 255, 0.55);
  --glow-teal: 0 0 18px rgba(0, 245, 225, 0.55), 0 0 42px rgba(0, 245, 225, 0.22);
  --glow-purple: 0 0 22px rgba(188, 19, 254, 0.5), 0 0 48px rgba(188, 19, 254, 0.18);
  --font-display: "Orbitron", "Courier New", monospace;
  --font-body: "Syne", system-ui, sans-serif;
  --radius: 16px;
  --transition-fast: 160ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  background: var(--bg-deep);
  color: var(--c-ice);
  font-family: var(--font-body);
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

.game-stage {
  position: relative;
  width: 100vw;
  height: 100vh;
}

#game-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* ---- Atmospheric overlays ---- */
.grain,
.scanlines,
.vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 20;
}

.grain {
  opacity: 0.055;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.scanlines {
  opacity: 0.06;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 2px,
    rgba(0, 245, 225, 0.07) 2px,
    rgba(0, 245, 225, 0.07) 3px
  );
}

.vignette {
  background: radial-gradient(circle at center, transparent 35%, rgba(5, 5, 16, 0.7) 100%);
}

/* ---- HUD ---- */
.hud {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  padding: 28px 36px;
  gap: 24px;
  pointer-events: none;
}

.hud-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.hud-block--right {
  align-items: flex-end;
}

.hud-block--center {
  align-items: center;
}

.hud-label {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-dim);
  text-shadow: 0 0 8px rgba(0, 245, 225, 0.25);
}

.hud-value {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
  color: var(--c-teal);
  text-shadow: var(--glow-teal);
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  line-height: 0.92;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.logo__line {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-ice);
  text-shadow: 0 0 12px rgba(224, 247, 255, 0.35);
}

.logo__line--accent {
  font-size: 26px;
  font-weight: 900;
  color: var(--c-purple);
  text-shadow: var(--glow-purple);
}

/* ---- Overlays ---- */
.overlay {
  position: absolute;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, rgba(5, 5, 16, 0.6) 0%, rgba(5, 5, 16, 0.92) 100%);
  opacity: 0;
  visibility: hidden;
  transition: opacity 380ms ease, visibility 380ms ease;
  backdrop-filter: blur(6px);
}

.overlay--active {
  opacity: 1;
  visibility: visible;
}

.overlay__panel {
  width: min(520px, 90vw);
  padding: 48px 42px;
  border: 1px solid rgba(0, 245, 225, 0.25);
  border-radius: var(--radius);
  background: var(--bg-panel);
  box-shadow: var(--glow-teal), inset 0 0 60px rgba(0, 245, 225, 0.06);
  text-align: center;
  transform: translateY(18px) scale(0.98);
  transition: transform 420ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.overlay--active .overlay__panel {
  transform: translateY(0) scale(1);
}

.overlay__kicker {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.35em;
  color: var(--c-teal);
  text-shadow: var(--glow-teal);
  margin-bottom: 16px;
}

.overlay__kicker--alert {
  color: var(--c-rose);
  text-shadow: 0 0 18px rgba(255, 42, 109, 0.55), 0 0 40px rgba(255, 42, 109, 0.22);
}

.overlay__title {
  font-family: var(--font-display);
  font-size: 46px;
  font-weight: 900;
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 18px;
  color: var(--c-ice);
  text-shadow: 0 0 24px rgba(224, 247, 255, 0.28);
}

.overlay__copy {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  color: var(--c-dim);
  margin-bottom: 28px;
}

.overlay__stat {
  color: var(--c-gold);
  font-weight: 800;
  text-shadow: 0 0 14px rgba(255, 214, 0, 0.45);
}

.overlay__controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 32px;
  font-size: 13px;
  color: var(--c-dim);
  letter-spacing: 0.04em;
}

kbd {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  padding: 7px 11px;
  border-radius: 6px;
  border: 1px solid rgba(0, 245, 225, 0.35);
  background: rgba(0, 245, 225, 0.08);
  color: var(--c-teal);
  box-shadow: 0 0 10px rgba(0, 245, 225, 0.15);
}

/* ---- Buttons ---- */
.arcade-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 18px 44px;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(0, 245, 225, 0.14), rgba(188, 19, 254, 0.14));
  box-shadow: 0 0 0 1px rgba(0, 245, 225, 0.35), var(--glow-teal);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.arcade-btn--secondary {
  background: linear-gradient(135deg, rgba(255, 42, 109, 0.14), rgba(188, 19, 254, 0.14));
  box-shadow: 0 0 0 1px rgba(255, 42, 109, 0.4), 0 0 22px rgba(255, 42, 109, 0.35);
}

.arcade-btn:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 0 0 1px rgba(0, 245, 225, 0.6), 0 0 32px rgba(0, 245, 225, 0.45);
}

.arcade-btn--secondary:hover {
  box-shadow: 0 0 0 1px rgba(255, 42, 109, 0.65), 0 0 34px rgba(255, 42, 109, 0.5);
}

.arcade-btn:active {
  transform: translateY(1px) scale(0.98);
}

.arcade-btn__glow {
  position: absolute;
  inset: 0;
  background: conic-gradient(from 0deg, transparent 0%, var(--c-teal) 20%, transparent 40%);
  opacity: 0.15;
  animation: rotate-glow 4s linear infinite;
}

.arcade-btn--secondary .arcade-btn__glow {
  background: conic-gradient(from 0deg, transparent 0%, var(--c-rose) 20%, transparent 40%);
}

.arcade-btn__text {
  position: relative;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.18em;
  color: var(--c-ice);
  text-shadow: 0 0 12px rgba(224, 247, 255, 0.4);
}

@keyframes rotate-glow {
  to {
    transform: rotate(360deg);
  }
}

/* ---- Mobile tweaks ---- */
@media (max-width: 640px) {
  .hud {
    padding: 18px 20px;
  }

  .hud-value {
    font-size: 30px;
  }

  .logo__line {
    font-size: 13px;
  }

  .logo__line--accent {
    font-size: 18px;
  }

  .overlay__title {
    font-size: 32px;
  }

  .overlay__panel {
    padding: 34px 26px;
  }
}