@view-transition {
      navigation: auto;
    }

    :root {
      --accent-green: #4ade80;
      --gold: #fde68a;
      --error: #ff2d55;
    }

    * { box-sizing: border-box; }

    html {
      height: 100%;
      scroll-behavior: smooth;
    }

    body {
      height: 100%;
      margin: 0;
      padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
      font-family: var(--font-body);
      color: var(--text);
      background: var(--bg);
      min-height: 100vh;
      line-height: 1.55;
      position: relative;
    }

    /* Scanline overlay */
    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 229, 255, 0.03) 2px,
        rgba(0, 229, 255, 0.03) 4px
      );
      pointer-events: none;
      z-index: 1000;
    }

    /* Grid background */
    body::after {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-image:
        repeating-linear-gradient(0deg, transparent, transparent 49px, rgba(0, 229, 255, 0.05) 49px, rgba(0, 229, 255, 0.05) 50px),
        repeating-linear-gradient(90deg, transparent, transparent 49px, rgba(0, 229, 255, 0.05) 49px, rgba(0, 229, 255, 0.05) 50px);
      pointer-events: none;
      z-index: -1;
    }

    a {
      color: var(--accent);
      text-decoration: none;
      transition: color 0.1s ease;
    }

    @media (hover: hover) {
      a:hover {
        color: var(--accent-secondary);
        text-shadow: 0 0 10px var(--accent-secondary);
      }
    }

    .container { max-width: 700px; margin: 0 auto; padding: 24px; position: relative; z-index: 1; }

    .nav {
      display: flex;
      align-items: stretch;
      justify-content: space-between;
      background: var(--bg);
      border-bottom: 4px solid var(--accent);
      z-index: 10;
      padding: 0;
      margin-bottom: 24px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 900;
      letter-spacing: 2px;
      padding: 16px 20px;
      background: var(--accent);
      color: var(--bg);
      text-transform: uppercase;
      font-size: 14px;
    }

    .brand img {
      height: 40px;
      width: 40px;
      border: 3px solid var(--bg);
      object-fit: cover;
    }

    .nav a {
      color: var(--text);
      font-weight: 900;
      text-transform: uppercase;
      letter-spacing: 1px;
      font-size: 12px;
    }

    .nav .links {
      display: flex;
      align-items: stretch;
    }

    .nav .links a {
      padding: 16px 20px;
      border-left: 3px solid var(--border);
      display: flex;
      align-items: center;
    }

    .back-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 12px 20px;
      border: 3px solid var(--border);
      border-radius: 0;
      background: var(--bg);
      color: var(--text);
      transition: all 0.1s ease;
      margin-bottom: 24px;
      font-weight: 900;
      text-transform: uppercase;
      letter-spacing: 1px;
      font-size: 12px;
      box-shadow: 4px 4px 0 var(--border);
    }

    @media (hover: hover) {
      .back-link:hover {
        background: var(--accent);
        color: var(--bg);
        transform: translate(2px, 2px);
        box-shadow: 2px 2px 0 var(--border);
        text-shadow: none;
      }
    }

    h1 {
      font-size: clamp(28px, 4.2vw, 44px);
      margin: 0 0 10px;
      text-transform: uppercase;
      letter-spacing: -1px;
      color: var(--text);
      text-align: center;
    }

    .subtitle {
      color: var(--text-muted);
      font-size: 14px;
      text-align: center;
      margin-bottom: 32px;
      font-family: var(--font-mono);
    }

    .subtitle::before {
      content: '> ';
      color: var(--accent);
    }

    .game-card {
      border: 4px solid var(--border);
      background: var(--surface);
      border-radius: 0;
      padding: 32px;
      box-shadow: 6px 6px 0 var(--border);
      margin-bottom: 24px;
    }

    .stats-row {
      display: flex;
      justify-content: space-around;
      gap: 16px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }

    .stat-box {
      flex: 1;
      min-width: 120px;
      text-align: center;
      padding: 16px;
      border: 1px solid var(--border);
      border-radius: 12px;
      background: rgba(11, 16, 32, 0.5);
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 8px;
    }

    .stat-value {
      color: var(--text);
      font-size: 24px;
      font-weight: 700;
    }

    .stat-value.gold {
      color: var(--gold);
    }

    .stat-value.success {
      color: #4ade80;
    }

    .question-display {
      text-align: center;
      margin-bottom: 32px;
    }

    .question-text {
      font-size: 48px;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 24px;
      min-height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .answer-input {
      width: 100%;
      max-width: 300px;
      margin: 0 auto;
      display: block;
      padding: 16px 24px;
      font-size: 32px;
      text-align: center;
      border: 2px solid var(--border);
      border-radius: 12px;
      background: rgba(11, 16, 32, 0.8);
      color: var(--text);
      font-weight: 700;
      transition: all 0.3s ease;
    }

    .answer-input:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(139, 211, 255, 0.1);
    }

    .answer-input.correct {
      border-color: #4ade80;
      background: rgba(74, 222, 128, 0.1);
    }

    .answer-input.incorrect {
      border-color: #ff2d55;
      background: rgba(248, 113, 113, 0.1);
    }

    .answer-choices {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      max-width: 500px;
      margin: 0 auto;
    }

    .answer-btn {
      padding: 20px;
      font-size: 28px;
      font-weight: 700;
      border: 2px solid var(--border);
      border-radius: 12px;
      background: rgba(11, 16, 32, 0.8);
      color: var(--text);
      cursor: pointer;
      transition: all 0.2s ease;
      min-height: 80px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    @media (hover: hover) {
      .answer-btn:hover {
        border-color: var(--accent);
        background: rgba(139, 211, 255, 0.1);
        transform: translateY(-2px);
      }
    }

    .answer-btn:active {
      transform: translateY(0);
    }

    .answer-btn.correct {
      border-color: #4ade80;
      background: rgba(74, 222, 128, 0.15);
      color: #4ade80;
    }

    .answer-btn.incorrect {
      border-color: #ff2d55;
      background: rgba(248, 113, 113, 0.15);
      color: #ff2d55;
    }

    .answer-btn:disabled {
      cursor: not-allowed;
      opacity: 0.6;
    }

    .btn {
      width: 100%;
      padding: 16px 32px;
      font-size: 18px;
      font-weight: 600;
      border: none;
      border-radius: 12px;
      cursor: pointer;
      transition: all 0.3s ease;
      margin-top: 16px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent), #5fadda);
      color: #0b1020;
    }

    @media (hover: hover) {
      .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(139, 211, 255, 0.3);
      }
    }

    .btn-primary:active {
      transform: translateY(0);
    }

    .feedback {
      text-align: center;
      font-size: 18px;
      font-weight: 600;
      margin-top: 16px;
      min-height: 28px;
      transition: all 0.3s ease;
    }

    .feedback.correct {
      color: #4ade80;
    }

    .feedback.incorrect {
      color: #ff2d55;
    }

    .progress-bar {
      width: 100%;
      height: 8px;
      background: rgba(42, 51, 80, 0.5);
      border-radius: 4px;
      overflow: hidden;
      margin-bottom: 24px;
    }

    .progress-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--accent), var(--accent-green));
      transition: width 0.3s ease;
      border-radius: 4px;
    }

    .start-screen, .game-screen, .results-screen {
      display: none;
    }

    .active {
      display: block;
    }

    .intro-text {
      color: var(--text-muted);
      font-size: 16px;
      line-height: 1.8;
      margin-bottom: 24px;
    }

    .highlight {
      color: var(--gold);
      font-weight: 600;
    }

    .results-summary {
      text-align: center;
      margin-bottom: 32px;
    }

    .results-title {
      font-size: 36px;
      margin-bottom: 16px;
    }

    .results-score {
      font-size: 24px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }

    .earnings {
      font-size: 48px;
      font-weight: 700;
      color: var(--gold);
      margin: 24px 0;
    }

    footer {
      margin: 56px 0 24px;
      color: var(--text-muted);
      font-size: 13px;
      text-align: center;
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.05); }
    }

    .pulse {
      animation: pulse 0.5s ease;
    }

    /* Mobile responsive */
    @media (max-width: 768px) {
      .container {
        padding: 16px;
      }

      .game-card {
        padding: 24px 16px;
      }

      .question-text {
        font-size: 36px;
      }

      .answer-input {
        font-size: 24px;
        padding: 12px 16px;
      }

      .answer-btn {
        font-size: 22px;
        padding: 16px;
        min-height: 70px;
      }

      .stat-value {
        font-size: 20px;
      }
    }

    /* Reduce motion for accessibility */
    @media (prefers-reduced-motion: reduce) {
      *,
      *::before,
      *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
      }
    }