.grid-container {
      max-width: 1100px;
      margin: 0 auto;
      padding: 56px 24px 96px;
    }

    .section-title {
      font-family: var(--font-display);
      font-size: clamp(28px, 3.5vw, 36px);
      font-weight: 400;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      margin-bottom: 28px;
    }

    .lab-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 18px;
    }

    .lab-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      position: relative;
      overflow: hidden;
      transition: all var(--transition);
    }

    .lab-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--accent-color);
      opacity: 0.6;
      transition: opacity var(--transition);
    }

    .lab-card:hover {
      background: var(--bg-card-hover);
      border-color: var(--accent-color);
      transform: translateY(-3px);
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    }

    .lab-card:hover::before { opacity: 1; }

    .lab-card.blue   { --accent-color: var(--cyan-bright); }
    .lab-card.purple { --accent-color: var(--purple); }
    .lab-card.green  { --accent-color: var(--green-bright); }

    .lab-header {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 14px;
    }

    .lab-icon {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.06);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      flex-shrink: 0;
    }

    .lab-info { flex: 1; }

    .lab-badge {
      display: inline-block;
      padding: 3px 8px;
      border-radius: 4px;
      font-family: var(--font-mono);
      font-size: 9px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      margin-bottom: 6px;
    }

    .badge-beginner     { color: var(--green-bright); background: rgba(34,197,94,0.08);  border: 1px solid rgba(34,197,94,0.18); }
    .badge-intermediate { color: var(--cyan-bright);  background: rgba(6,182,212,0.08);  border: 1px solid rgba(6,182,212,0.18); }
    .badge-advanced     { color: var(--purple);       background: rgba(168,85,247,0.08); border: 1px solid rgba(168,85,247,0.18); }

    .lab-card h3 {
      font-family: var(--font-body);
      font-size: 16px;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: -0.01em;
      margin: 0;
    }

    .lab-description {
      font-size: 13px;
      line-height: 1.6;
      color: var(--text-secondary);
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .lab-meta {
      display: flex;
      gap: 12px;
      font-family: var(--font-mono);
      font-size: 11px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    .lab-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      background: var(--accent-color);
      color: #0a0a0f;
      text-decoration: none;
      font-family: var(--font-body);
      font-weight: 600;
      font-size: 13px;
      border-radius: 8px;
      transition: all var(--transition);
    }

    .lab-btn:hover {
      filter: brightness(1.15);
      box-shadow: 0 4px 24px var(--accent-color);
      transform: translateY(-1px);
    }

    @media (max-width: 768px) {
      .grid-container { padding: 32px 20px 64px; }
    }