/* Unity-specific accent override: orange/green game feel */
  .header-badge { background: linear-gradient(90deg, #ff6b35, #06d6a0); }
  header h1 { background: linear-gradient(135deg, #fff 20%, #ff6b35 60%, #ffd166); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
  header::before {
    background: radial-gradient(circle at 25% 50%, rgba(255,107,53,0.18) 0%, transparent 60%),
                radial-gradient(circle at 75% 30%, rgba(6,214,160,0.14) 0%, transparent 50%);
  }
  .nav-item.active { border-left-color: #ff6b35; }
  .lesson-num { color: #ff6b35; }
  .unity-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 22px 0; }
  .unity-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 22px;
    border-top: 3px solid var(--accent);
    transition: transform 0.2s;
  }
  .unity-card:hover { transform: translateY(-4px); }
  .unity-card .uc-icon { font-size: 2rem; margin-bottom: 10px; }
  .unity-card h4 { font-family: 'Fredoka One', cursive; font-size: 1.05rem; margin-bottom: 6px; }
  .unity-card p { font-size: 0.87rem; color: var(--muted); }
  .step-list { counter-reset: step; list-style: none; padding: 0; }
  .step-list li {
    counter-increment: step;
    display: flex;
    gap: 14px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
    color: #d4d4e8;
  }
  .step-list li::before {
    content: counter(step);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, #ff6b35, #ffd166);
    color: #0f0e17;
    font-weight: 900;
    font-size: 12px;
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 2px;
  }
  .spec-table th { color: #ff6b35; }
  .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 18px 0; }
  @media(max-width:600px) { .two-col { grid-template-columns: 1fr; } }
  .scene-diagram {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    font-family: 'Fira Code', monospace;
    font-size: 0.83rem;
    color: #a7a9be;
    line-height: 2;
    margin: 18px 0;
  }
  .scene-diagram .node { color: #ffd166; }
  .scene-diagram .comp { color: #06d6a0; }
  .scene-diagram .val  { color: #ff9f6b; }