:root {
  --bg-a: #0a0612;
  --bg-b: #150b1f;
  --fg: #f4f0ff;
  --accent: #b388ff;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: radial-gradient(ellipse at center, var(--bg-b) 0%, var(--bg-a) 70%);
  color: var(--fg);
  font-family: 'Courier New', ui-monospace, monospace;
  letter-spacing: 0.05em;
  user-select: none;
  -webkit-user-select: none;
}

#game {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

#hud {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 5;
  text-align: right;
  font-size: 14px;
  text-shadow: 0 0 8px rgba(0, 0, 0, 0.7);
  pointer-events: none;
}

.hud-row {
  margin-bottom: 6px;
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  align-items: baseline;
}

.hud-label {
  opacity: 0.55;
  font-size: 11px;
}

#score, #lines, #bpm {
  font-size: 22px;
  font-weight: bold;
  min-width: 4ch;
  display: inline-block;
  text-align: right;
}

.hud-help {
  margin-top: 18px;
  flex-direction: column;
  gap: 2px;
  opacity: 0.45;
  font-size: 11px;
  text-align: right;
}

.hud-toggle {
  pointer-events: auto;
  margin-top: 12px;
  justify-content: flex-end;
}

#mute-btn {
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.15em;
  padding: 6px 14px;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--accent);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.18s ease;
}

#mute-btn:hover {
  background: var(--accent);
  color: var(--bg-a);
  box-shadow: 0 0 16px var(--accent);
}

#mute-btn[aria-pressed="true"] {
  opacity: 0.5;
  border-style: dashed;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 4, 16, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.overlay.hidden { display: none; }

.overlay-card {
  text-align: center;
  padding: 40px 56px;
  border: 1px solid rgba(179, 136, 255, 0.35);
  border-radius: 12px;
  background: rgba(20, 10, 35, 0.85);
  box-shadow: 0 0 60px rgba(179, 136, 255, 0.25);
  max-width: 460px;
}

.overlay-card h1 {
  font-size: 32px;
  margin-bottom: 14px;
  letter-spacing: 0.2em;
  text-shadow: 0 0 20px var(--accent);
}

.overlay-card p {
  margin-bottom: 24px;
  opacity: 0.75;
  line-height: 1.55;
  font-size: 13px;
}

.overlay-card button {
  font-family: inherit;
  font-size: 14px;
  letter-spacing: 0.15em;
  padding: 12px 32px;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--accent);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.18s ease;
}

.overlay-card button:hover {
  background: var(--accent);
  color: var(--bg-a);
  box-shadow: 0 0 24px var(--accent);
}

#frenzy-banner {
  position: fixed;
  z-index: 8;
  font: bold 30px monospace;
  letter-spacing: 0.08em;
  pointer-events: none;
  transform-origin: 50% 50%;
  white-space: nowrap;
  text-align: center;
}

#paused-overlay {
  position: fixed;
  inset: 0;
  z-index: 9;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
  font: bold 36px monospace;
  letter-spacing: 0.2em;
  pointer-events: none;
}

@media (max-width: 620px) {
  #hud {
    top: 8px;
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 12px;
    width: calc(100vw - 20px);
    text-align: center;
    font-size: 10px;
    letter-spacing: 0;
  }

  .hud-row {
    margin-bottom: 0;
    gap: 4px;
  }

  .hud-label {
    font-size: 9px;
  }

  #score, #lines, #bpm {
    min-width: 0;
    font-size: 15px;
  }

  .hud-help,
  .hud-toggle {
    display: none;
  }
}