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

    /* ── Design Tokens ── */
    :root {
      --bg-body:        rgb(4, 4, 5);
      --bg-card:        rgb(17, 17, 18);
      --bg-card-hover:  rgb(22, 22, 24);
      --text-primary:   #ffffff;
      --text-body:      rgb(179, 176, 185);
      --text-muted:     rgb(120, 118, 130);
      --accent:         rgb(96, 224, 236);
      --accent-hover:   rgb(120, 232, 242);
      --border-color:   rgba(245, 242, 255, 0.08);
      --gradient:       linear-gradient(90deg, rgb(46, 229, 155), rgb(98, 223, 240));
      --radius-card:    20px;
      --radius-pill:    48px;
      --radius-btn:     8px;
      --sidebar-width:  280px;
    }

    /* ── Base ── */
    html { scroll-behavior: smooth; }

    body {
      font-family: 'Manrope', sans-serif;
      background: var(--bg-body);
      color: var(--text-body);
      font-size: 16px;
      line-height: 1.6;
      overflow-x: hidden;
      position: relative;
    }

    /* ── Background Grid + Glows ── */
    body::before {
      content: '';
      position: fixed;
      inset: 0;
      background-image:
        linear-gradient(rgba(245, 242, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(245, 242, 255, 0.02) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: 0;
    }

    .glow-tl, .glow-tr {
      position: fixed;
      width: 800px;
      height: 800px;
      border-radius: 50%;
      pointer-events: none;
      z-index: 0;
    }
    .glow-tl { top: -200px; left: -200px; background: radial-gradient(circle, rgba(46, 229, 155, 0.06) 0%, transparent 70%); }
    .glow-tr { top: -200px; right: -200px; background: radial-gradient(circle, rgba(98, 223, 240, 0.05) 0%, transparent 70%); }

    /* ── Layout: Sidebar + Main ── */
    .workshop-layout {
      display: flex;
      min-height: 100vh;
      position: relative;
      z-index: 1;
    }

    /* ── Sidebar ── */
    .sidebar {
      width: var(--sidebar-width);
      background: var(--bg-card);
      border-right: 1px solid var(--border-color);
      padding: 24px 0;
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      overflow-y: auto;
      z-index: 10;
      transition: transform 0.3s ease;
    }

    .sidebar-logo {
      padding: 0 20px 24px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 16px;
    }

    .sidebar-logo img {
      height: 28px;
      width: auto;
    }

    .sidebar-title {
      padding: 0 20px 16px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .sidebar-nav a {
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-body);
      text-decoration: none;
      transition: all 0.2s;
      border-left: 3px solid transparent;
    }

    .sidebar-nav a:hover {
      color: var(--text-primary);
      background: rgba(255, 255, 255, 0.03);
    }

    .sidebar-nav a.active {
      color: var(--accent);
      border-left-color: var(--accent);
      background: rgba(96, 224, 236, 0.05);
    }

    .sidebar-nav .nav-number {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 22px;
      height: 22px;
      border-radius: 6px;
      background: rgba(255, 255, 255, 0.06);
      font-size: 11px;
      font-weight: 700;
      flex-shrink: 0;
    }

    .sidebar-nav a.active .nav-number {
      background: rgba(96, 224, 236, 0.15);
      color: var(--accent);
    }

    .sidebar-resources {
      margin-top: 24px;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }

    .sidebar-resources-title {
      padding: 0 20px 12px;
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .sidebar-resources a {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 8px 20px;
      font-size: 13px;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

    .sidebar-resources a:hover { color: var(--accent); }

    .sidebar-resources a svg {
      width: 14px;
      height: 14px;
      flex-shrink: 0;
    }

    /* Mobile sidebar toggle */
    .sidebar-toggle {
      display: none;
      position: fixed;
      top: 16px;
      left: 16px;
      z-index: 20;
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      color: var(--text-primary);
      cursor: pointer;
      align-items: center;
      justify-content: center;
    }

    .sidebar-toggle svg { width: 20px; height: 20px; }

    /* ── Main Content ── */
    .main-content {
      flex: 1;
      margin-left: var(--sidebar-width);
      padding: 48px 60px 100px;
      max-width: 900px;
    }

    /* ── Module Sections ── */
    .module-section {
      display: none;
      animation: fadeIn 0.4s ease;
    }

    .module-section.active { display: block; }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(16px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ── Section Badge ── */
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      font-size: 14px;
      font-weight: 500;
      color: var(--accent);
      margin-bottom: 20px;
    }

    .section-badge svg {
      width: 14px;
      height: 14px;
      fill: currentColor;
    }

    /* ── Typography ── */
    .module-section h1 {
      font-size: 40px;
      font-weight: 500;
      line-height: 1.1;
      letter-spacing: -0.01em;
      color: var(--text-primary);
      margin-bottom: 12px;
    }

    .module-section h2 {
      font-size: 28px;
      font-weight: 500;
      line-height: 1.2;
      letter-spacing: -0.01em;
      color: var(--text-primary);
      margin-top: 48px;
      margin-bottom: 16px;
    }

    .module-section h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-primary);
      margin-top: 32px;
      margin-bottom: 12px;
    }

    .module-section p {
      margin-bottom: 16px;
      line-height: 1.7;
    }

    .module-section ul, .module-section ol {
      margin-bottom: 16px;
      padding-left: 24px;
    }

    .module-section li {
      margin-bottom: 8px;
      line-height: 1.6;
    }

    .module-section li strong {
      color: var(--text-primary);
    }

    .duration-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      border-radius: var(--radius-pill);
      background: rgba(96, 224, 236, 0.08);
      border: 1px solid rgba(96, 224, 236, 0.15);
      font-size: 13px;
      font-weight: 600;
      color: var(--accent);
      margin-bottom: 32px;
    }

    .duration-badge svg {
      width: 14px;
      height: 14px;
    }

    /* ── Info Cards ── */
    .info-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 24px;
      margin: 24px 0;
    }

    .info-card h4 {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .info-card h4 svg {
      width: 18px;
      height: 18px;
      color: var(--accent);
    }

    .info-card ul { margin-bottom: 0; }

    /* ── Note / Warning boxes ── */
    .note-box {
      background: rgba(96, 224, 236, 0.05);
      border: 1px solid rgba(96, 224, 236, 0.15);
      border-radius: 12px;
      padding: 16px 20px;
      margin: 20px 0;
      font-size: 14px;
      line-height: 1.6;
    }

    .note-box strong {
      color: var(--accent);
    }

    .warning-box {
      background: rgba(255, 180, 50, 0.06);
      border: 1px solid rgba(255, 180, 50, 0.2);
      border-radius: 12px;
      padding: 16px 20px;
      margin: 20px 0;
      font-size: 14px;
      line-height: 1.6;
    }

    .warning-box strong {
      color: rgb(255, 200, 100);
    }

    /* ── Code Blocks ── */
    .code-block {
      background: rgb(12, 12, 14);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      margin: 20px 0;
      overflow: hidden;
    }

    .code-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 16px;
      background: rgba(255, 255, 255, 0.03);
      border-bottom: 1px solid var(--border-color);
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
    }

    .copy-btn {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      padding: 4px 10px;
      border-radius: 6px;
      background: rgba(255, 255, 255, 0.06);
      border: none;
      color: var(--text-muted);
      font-size: 12px;
      font-family: 'Manrope', sans-serif;
      cursor: pointer;
      transition: all 0.2s;
    }

    .copy-btn:hover {
      background: rgba(255, 255, 255, 0.1);
      color: var(--text-primary);
    }

    .copy-btn svg { width: 12px; height: 12px; }

    .code-block pre {
      padding: 16px;
      overflow-x: auto;
      font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
      font-size: 14px;
      line-height: 1.6;
      color: rgb(200, 198, 210);
    }

    .code-block .line-number {
      color: var(--text-muted);
      user-select: none;
      margin-right: 16px;
      display: inline-block;
      width: 20px;
      text-align: right;
    }

    /* ── Step Cards ── */
    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-card);
      padding: 28px;
      margin: 24px 0;
      transition: all 0.3s;
    }

    .step-card:hover {
      border-color: rgba(245, 242, 255, 0.15);
    }

    .step-number {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 8px;
      background: var(--gradient);
      color: rgb(4, 4, 5);
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .step-card h3 {
      margin-top: 0;
      font-size: 18px;
    }

    .step-card p { font-size: 15px; }
    .step-card ul, .step-card ol { font-size: 15px; }

    /* ── YAML block ── */
    .yaml-key { color: rgb(96, 224, 236); }
    .yaml-value { color: rgb(180, 220, 180); }
    .yaml-string { color: rgb(200, 180, 230); }

    /* ── Navigation Buttons ── */
    .module-nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: 64px;
      padding-top: 32px;
      border-top: 1px solid var(--border-color);
      gap: 16px;
    }

    .nav-btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-family: 'Manrope', sans-serif;
      font-size: 15px;
      font-weight: 500;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.3s;
      border: 1px solid var(--border-color);
      background: transparent;
      color: var(--text-primary);
    }

    .nav-btn:hover {
      border-color: rgba(245, 242, 255, 0.2);
      background: rgba(255, 255, 255, 0.03);
    }

    .nav-btn.primary {
      background: var(--accent);
      color: rgb(17, 17, 18);
      border-color: transparent;
      font-weight: 600;
    }

    .nav-btn.primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }

    .nav-btn svg { width: 16px; height: 16px; }

    /* ── Gradient CTA Banner ── */
    .cta-banner {
      background: var(--gradient);
      border-radius: var(--radius-card);
      padding: 56px 40px;
      text-align: center;
      margin-top: 48px;
    }

    .cta-banner h2 {
      font-size: 32px;
      font-weight: 500;
      color: rgb(4, 4, 5);
      margin-top: 0;
      margin-bottom: 12px;
    }

    .cta-banner p {
      font-size: 16px;
      color: rgba(4, 4, 5, 0.7);
      margin-bottom: 24px;
      max-width: 500px;
      margin-left: auto;
      margin-right: auto;
    }

    .btn-dark {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      background: rgb(4, 4, 5);
      color: var(--text-primary);
      font-family: 'Manrope', sans-serif;
      font-size: 16px;
      font-weight: 600;
      text-decoration: none;
      border: none;
      cursor: pointer;
      transition: all 0.3s;
    }

    .btn-dark:hover { background: rgb(17, 17, 18); transform: translateY(-1px); }

    /* ── Workshop Outline Grid ── */
    .outline-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      margin: 24px 0;
    }

    .outline-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 20px;
      cursor: pointer;
      transition: all 0.3s;
    }

    .outline-item:hover {
      border-color: rgba(245, 242, 255, 0.15);
      background: var(--bg-card-hover);
    }

    .outline-item .outline-number {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 6px;
    }

    .outline-item .outline-name {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-primary);
      margin-bottom: 4px;
    }

    .outline-item .outline-time {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* ── Screenshot Images ── */
    .screenshot {
      width: 100%;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      margin: 20px 0;
      display: block;
    }

    .screenshot-caption {
      font-size: 13px;
      color: var(--text-muted);
      text-align: center;
      margin-top: -12px;
      margin-bottom: 20px;
      font-style: italic;
    }

    /* ── Responsive ── */
    @media (max-width: 900px) {
      .sidebar {
        transform: translateX(-100%);
      }

      .sidebar.open {
        transform: translateX(0);
      }

      .sidebar-toggle {
        display: flex;
      }

      .main-content {
        margin-left: 0;
        padding: 48px 24px 80px;
      }

      .module-section h1 { font-size: 32px; }
      .module-section h2 { font-size: 24px; }
      .outline-grid { grid-template-columns: 1fr; }
      .module-nav { flex-direction: column; }
    }