:root {
      --bg-primary: #0f0f1a;
      --bg-secondary: #1a1a2e;
      --bg-card: #16213e;
      --accent: #e94560;
      --accent-hover: #ff6b6b;
      --text-primary: #eee;
      --text-secondary: #888;
      --border: #2a2a4a;
      --spark-gold: #ffd700;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: var(--bg-primary);
      color: var(--text-primary);
      min-height: 100dvh;
      min-height: -webkit-fill-available;
      overflow: hidden;
      touch-action: none;
      -webkit-tap-highlight-color: transparent;
      -webkit-user-select: none;
      user-select: none;
      overscroll-behavior: none;
    }

    /* Header — rendered by game-header.js */

    /* Game Container */
    #gameContainer {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 1;
    }

    #gameCanvas {
      display: block;
    }

    /* HUD — single compact bar */
    .hud {
      position: fixed;
      top: 70px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      align-items: center;
      gap: 0;
      z-index: 50;
      background: rgba(10, 15, 30, 0.6);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: 20px;
      padding: 0.3rem 0.6rem;
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
    }

    .hud-item {
      display: flex;
      align-items: center;
      gap: 0.25rem;
      padding: 0.15rem 0.5rem;
    }

    .hud-item + .hud-item {
      border-left: 1px solid rgba(255, 255, 255, 0.1);
    }

    .hud-icon {
      font-size: 0.9rem;
      filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
    }

    .hud-coin {
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: radial-gradient(circle at 35% 35%, #ffe066, #f5a623, #d4880f);
      box-shadow: inset 0 -2px 3px rgba(0,0,0,0.2), 0 1px 3px rgba(0,0,0,0.3);
      border: 1.5px solid #d4880f;
      flex-shrink: 0;
    }
    .hud-value {
      font-weight: 700;
      font-size: 1rem;
      color: var(--spark-gold);
      text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    }
    .hud-label {
      font-size: 0.65rem;
      color: rgba(255, 255, 255, 0.5);
    }

    .hud-item.sparks .hud-value {
      transition: transform 0.15s ease-out;
    }

    .hud-item.sparks #sparkCount {
      background: linear-gradient(135deg, #ffd700, #ffaa00);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* Controls hint */
    .controls-hint {
      position: fixed;
      bottom: 1rem;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(22, 33, 62, 0.25);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 12px;
      padding: 0.5rem 1.2rem;
      font-size: 0.85rem;
      color: var(--text-secondary);
      z-index: 50;
      text-align: center;
      backdrop-filter: blur(6px);
    }

    .controls-hint kbd {
      background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 0.2rem 0.5rem;
      margin: 0 0.2rem;
      font-family: inherit;
      color: var(--text-primary);
      font-weight: 600;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }

    /* Menu Screen */
    #gameHeader { position: relative; z-index: 201; }

    .menu-screen {
      position: fixed;
      inset: 0;
      top: 48px;
      background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 100%);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 200;
      transition: opacity 0.3s, visibility 0.3s;
    }

    .menu-screen.hidden {
      opacity: 0;
      visibility: hidden;
    }

    .menu-header {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.8rem 1rem;
      background: var(--bg-secondary);
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .menu-header .back-btn {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 1rem;
      padding: 0.3rem 0.6rem;
    }

    .menu-header .logo {
      color: var(--text-primary);
      text-decoration: none;
      font-weight: 700;
      font-size: 1rem;
    }

    .menu-title {
      font-size: 3rem;
      font-weight: 800;
      margin-bottom: 0.5rem;
      background: linear-gradient(135deg, var(--spark-gold), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .menu-subtitle {
      color: var(--text-secondary);
      margin-bottom: 2rem;
      font-size: 1.1rem;
    }

    .menu-lumble {
      font-size: 5rem;
      margin-bottom: 1.5rem;
      animation: bounce 2s ease-in-out infinite;
    }

    @keyframes bounce {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-15px); }
    }

    .biome-select {
      display: flex;
      gap: 1rem;
      margin-bottom: 2rem;
      flex-wrap: wrap;
      justify-content: center;
      max-width: 500px;
    }

    .biome-btn {
      background: var(--bg-card);
      border: 2px solid var(--border);
      border-radius: 12px;
      padding: 1rem 1.5rem;
      color: var(--text-primary);
      cursor: pointer;
      transition: all 0.2s;
      text-align: center;
      min-width: 140px;
    }

    .biome-btn:hover {
      border-color: var(--accent);
      transform: translateY(-2px);
    }

    .biome-btn.selected {
      border-color: var(--spark-gold);
      background: rgba(255, 215, 0, 0.1);
    }

    .biome-btn.locked {
      opacity: 0.5;
      cursor: not-allowed;
    }

    .biome-icon { font-size: 2rem; display: block; margin-bottom: 0.5rem; }
    .biome-name { font-weight: 700; font-size: 0.9rem; }
    .biome-sparks { font-size: 0.75rem; color: var(--spark-gold); }

    .play-btn {
      background: linear-gradient(135deg, var(--accent), var(--accent-hover));
      border: none;
      color: white;
      font-size: 1.3rem;
      font-weight: 700;
      padding: 1rem 3rem;
      border-radius: 50px;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 4px 20px rgba(233, 69, 96, 0.4);
    }

    .play-btn:hover {
      transform: scale(1.05);
      box-shadow: 0 6px 30px rgba(233, 69, 96, 0.6);
    }

    /* Results Modal */
    .results-modal {
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, 0.85);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 300;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s;
    }

    .results-modal.show {
      opacity: 1;
      visibility: visible;
    }

    .results-content {
      background: var(--bg-card);
      border-radius: 16px;
      padding: 2rem;
      text-align: center;
      max-width: 90%;
      width: 400px;
      transform: scale(0.9);
      transition: transform 0.3s;
    }

    .results-modal.show .results-content {
      transform: scale(1);
    }

    .results-icon { font-size: 4rem; margin-bottom: 1rem; }
    .results-title { font-size: 1.8rem; margin-bottom: 0.5rem; }
    .results-subtitle { color: var(--text-secondary); margin-bottom: 1.5rem; }

    .results-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1rem;
      margin-bottom: 1.5rem;
    }

    .stat-box {
      background: var(--bg-secondary);
      border-radius: 8px;
      padding: 0.75rem;
    }

    .stat-value {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--spark-gold);
    }

    .stat-label {
      font-size: 0.7rem;
      color: var(--text-secondary);
      text-transform: uppercase;
    }

    .final-score {
      background: var(--bg-secondary);
      border-radius: 8px;
      padding: 1rem;
      margin-bottom: 1.5rem;
    }

    .final-score-label {
      font-size: 0.8rem;
      color: var(--text-secondary);
      text-transform: uppercase;
    }

    .final-score-value {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent);
    }

    .results-buttons {
      display: flex;
      gap: 0.75rem;
    }

    .results-buttons .btn {
      flex: 1;
      padding: 0.75rem;
      border-radius: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
    }

    .btn-secondary {
      background: var(--bg-secondary);
      border: 1px solid var(--border);
      color: var(--text-primary);
    }

    .btn-primary {
      background: var(--accent);
      border: 1px solid var(--accent);
      color: white;
    }

    /* Leaderboard */
    .leaderboard-section {
      position: fixed;
      top: 60px;
      right: 1rem;
      width: 240px;
      background: linear-gradient(135deg, rgba(22, 33, 62, 0.95), rgba(26, 26, 46, 0.9));
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 1rem;
      z-index: 50;
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    }

    .leaderboard-title {
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      padding-bottom: 0.5rem;
      border-bottom: 1px solid var(--border);
    }

    .leaderboard-list {
      list-style: none;
      font-size: 0.85rem;
    }

    .leaderboard-item {
      display: flex;
      align-items: center;
      padding: 0.4rem 0.2rem;
      gap: 0.5rem;
      border-radius: 6px;
      transition: background 0.2s;
    }

    .leaderboard-item:hover {
      background: rgba(255, 255, 255, 0.05);
    }

    .lb-rank {
      width: 24px;
      font-weight: 700;
      text-align: center;
    }
    .lb-rank.gold { color: #ffd700; text-shadow: 0 0 8px rgba(255, 215, 0, 0.5); }
    .lb-rank.silver { color: #c0c0c0; text-shadow: 0 0 8px rgba(192, 192, 192, 0.5); }
    .lb-rank.bronze { color: #cd7f32; text-shadow: 0 0 8px rgba(205, 127, 50, 0.5); }
    .lb-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .lb-score { color: var(--spark-gold); font-weight: 600; }

    /* Mobile */
    @media (max-width: 768px) {
      .leaderboard-section { display: none !important; }
      .controls-hint {
        display: none !important;
      }
      .hud {
        top: 64px;
        max-width: calc(100vw - 1rem);
      }
      .hud-label { display: none; }
    }

    /* Touch controls for mobile - Gesture based */
    .touch-overlay {
      position: fixed;
      inset: 0;
      display: none;
      z-index: 40;
      touch-action: none;
    }

    @media (max-width: 768px) {
      .touch-overlay.active { display: block; }
    }

    .joystick-zone {
      position: absolute;
      left: 0;
      bottom: 0;
      width: 50%;
      height: 60%;
      z-index: 10;
    }

    .camera-zone {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      z-index: 5;
    }

    .joystick-base {
      position: absolute;
      width: 120px;
      height: 120px;
      background: rgba(255,255,255,0.15);
      border: 3px solid rgba(255,255,255,0.3);
      border-radius: 50%;
      display: none;
    }

    .joystick-thumb {
      position: absolute;
      width: 50px;
      height: 50px;
      background: rgba(233, 69, 96, 0.8);
      border: 3px solid white;
      border-radius: 50%;
      transform: translate(-50%, -50%);
      display: none;
    }

    .touch-buttons {
      position: fixed;
      bottom: 100px;
      right: 20px;
      display: none;
      flex-direction: column;
      gap: 15px;
      z-index: 50;
    }

    @media (max-width: 768px) {
      .touch-buttons { display: flex; }
    }

    .touch-btn {
      width: 70px;
      height: 70px;
      background: rgba(22, 33, 62, 0.85);
      border: 3px solid var(--border);
      border-radius: 50%;
      color: var(--text-primary);
      font-size: 1.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
      touch-action: manipulation;
      user-select: none;
    }

    .touch-btn:active {
      background: var(--accent);
      border-color: var(--accent);
      transform: scale(0.95);
    }

    .touch-btn.jump {
      background: rgba(100, 200, 100, 0.3);
      border-color: #4CAF50;
    }

    .touch-btn.latch {
      background: rgba(233, 69, 96, 0.3);
      border-color: var(--accent);
    }

    .gesture-hint {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(0,0,0,0.7);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.75rem;
      color: rgba(255,255,255,0.8);
      display: none;
      white-space: nowrap;
    }

    @media (max-width: 768px) {
      .gesture-hint.active { display: block; }
    }

    /* More Games Section */
    .more-games {
      background: var(--bg-secondary);
      border-top: 1px solid var(--border);
      padding: 1.5rem;
      margin-top: auto;
    }

    .more-games-title {
      font-size: 1rem;
      color: var(--text-secondary);
      margin-bottom: 1rem;
      text-align: center;
    }

    .more-games-grid {
      display: flex;
      gap: 0.75rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .more-game-link {
      background: var(--bg-primary);
      border: 1px solid var(--border);
      border-radius: 10px;
      padding: 0.75rem 1rem;
      text-decoration: none;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.9rem;
      transition: transform 0.2s, border-color 0.2s;
    }

    .more-game-link:hover {
      transform: translateY(-2px);
      border-color: var(--accent);
    }

    .more-game-link span:first-child {
      font-size: 1.2rem;
    }

    @media (max-width: 600px) {
      .more-games { display: none; }
    }

    /* Floating text for chain combos */
    .floating-text {
      position: fixed;
      pointer-events: none;
      font-weight: 900;
      font-size: 1.5rem;
      text-shadow: 0 2px 8px rgba(0,0,0,0.5);
      z-index: 60;
      animation: floatUp 1s ease-out forwards;
    }
    @keyframes floatUp {
      0% { opacity: 1; transform: translateY(0) scale(1); }
      100% { opacity: 0; transform: translateY(-60px) scale(1.3); }
    }

    .chain-indicator {
      position: fixed;
      pointer-events: none;
      font-weight: 900;
      font-size: 1.1rem;
      color: var(--spark-gold);
      text-shadow: 0 1px 4px rgba(0,0,0,0.5);
      z-index: 55;
      opacity: 0;
      transition: opacity 0.3s;
    }
    .chain-indicator.active {
      opacity: 1;
    }

    .zone-banner {
      position: fixed;
      top: 30%;
      left: 50%;
      transform: translateX(-50%);
      pointer-events: none;
      font-weight: 900;
      font-size: 2rem;
      text-shadow: 0 2px 12px rgba(0,0,0,0.7);
      z-index: 65;
      animation: floatUp 2s ease-out forwards;
      white-space: nowrap;
    }

    .personal-best {
      text-align: center;
      margin-top: 0.5rem;
      font-size: 0.9rem;
      color: var(--spark-gold);
      font-weight: 600;
    }

    /* Accessibility: Respect reduced motion preferences */