/* ============================================================
   PING PONG — Styles
   Uses design tokens from design-tokens.css throughout.
   ============================================================ */

/* ── Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Page Layout ── */
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: var(--color-neutral-900);
  overflow: hidden;
  font-family: var(--font-family-system);
  color: var(--color-neutral-100);
  line-height: var(--line-height-normal);
}

/* ── Game Container ── */
#game-container {
  position: relative;
  width: 100%;
  max-width: 960px;
}

/* ── Canvas ── */
#game-canvas {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-neutral-900);
  touch-action: none;
  border-radius: var(--radius-sm);
}

#game-canvas:focus {
  outline: none;
}

/* ── Button Overlay ── */
#button-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-3);
  pointer-events: none;
}

/* Hidden by default — JS toggles visibility */
#menu-options,
#restart-btn,
#play-again-btn {
  display: none;
}

/* ── Menu Options Panel ── */
#menu-options {
  position: absolute;
  bottom: 12%;
  left: 50%;
  transform: translateX(-50%);
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

/* ── Option Group (row of toggle buttons) ── */
.option-group {
  display: flex;
  gap: var(--space-2);
}

/* ── Option Buttons (toggle style) ── */
.option-btn {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.option-btn.selected {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.option-btn:hover {
  background: rgba(255, 255, 255, 0.12);
}

/* ── Restart Button — Top-Right Corner ── */
#restart-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-sm);
}

/* ── Mute Button — Bottom-Right Corner ── */
#mute-btn {
  position: absolute;
  bottom: var(--space-2);
  right: var(--space-2);
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
  pointer-events: auto;
  opacity: 0.5;
  transition: opacity var(--transition-normal);
}

#mute-btn:hover {
  opacity: 1;
}

/* ── Base Button Styles ── */
.game-btn {
  pointer-events: auto;
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-neutral-100);
  font-size: var(--font-size-md);
  font-family: var(--font-family-system);
  font-weight: var(--font-weight-bold);
  transition: background var(--transition-normal);
  box-shadow: var(--shadow-subtle);
  letter-spacing: 0.02em;
}

.game-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ── Primary Button (Start Game, Play Again) ── */
.primary-btn {
  background: var(--game-btn-bg);
}

.primary-btn:hover {
  background: var(--game-btn-bg-hover);
}

.primary-btn:active {
  background: rgba(255, 255, 255, 0.25);
}

/* ── Secondary Button (Restart, Mute) ── */
.secondary-btn {
  background: rgba(255, 255, 255, 0.06);
}

.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

.secondary-btn:active {
  background: var(--game-btn-bg-hover);
}

/* ── Screen Reader Only ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Mobile Responsive ── */
@media (max-width: 600px) {
  #game-container {
    width: 100vw;
  }

  #game-canvas {
    border-radius: 0;
  }

  #restart-btn {
    top: var(--space-1);
    right: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--font-size-xs);
  }

  #mute-btn {
    bottom: var(--space-1);
    right: var(--space-1);
  }

  .game-btn {
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-5);
  }

  .option-btn {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
  }

  #menu-options {
    bottom: 8%;
    gap: var(--space-2);
  }
}