/* roulang page: index */
:root {
            --primary: #1e40af;
            --primary-light: #2563eb;
            --bg-canvas: #ffffff;
            --bg-subtle: #f8fafc;
            --border-color: #e2e8f0;
            --text-main: #0f172a;
            --text-muted: #64748b;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-canvas);
            color: var(--text-main);
            overflow-x: hidden;
        }
        .code-box-shadow {
            box-shadow: 0 20px 40px -15px rgba(30, 64, 175, 0.08), 0 0 0 1px rgba(226, 232, 240, 0.8);
        }
        .hero-stacked-1 {
            transform: rotate(-1.5deg) translateY(-8px);
            z-index: 10;
        }
        .hero-stacked-2 {
            transform: rotate(2deg) translateY(12px) translateX(10px);
            z-index: 20;
        }
        .hero-stacked-main {
            z-index: 30;
        }

/* roulang page: category1 */
:root {
      --primary: #1e40af;
      --primary-light: #2563eb;
      --bg-canvas: #ffffff;
      --bg-subtle: #f8fafc;
      --border-color: #e2e8f0;
      --text-main: #0f172a;
      --text-muted: #64748b;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-canvas);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .code-box-shadow {
      box-shadow: 0 20px 40px -15px rgba(30, 64, 175, 0.08), 0 0 0 1px rgba(226, 232, 240, 0.8);
    }
    .filter-btn.active {
      background-color: #1e40af;
      color: #ffffff;
      border-color: #1e40af;
    }

/* roulang page: category2 */
:root {
      --primary: #1e40af;
      --primary-light: #2563eb;
      --bg-canvas: #ffffff;
      --bg-subtle: #f8fafc;
      --border-color: #e2e8f0;
      --text-main: #0f172a;
      --text-muted: #64748b;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-canvas);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .code-box-shadow {
      box-shadow: 0 20px 40px -15px rgba(30, 64, 175, 0.08), 0 0 0 1px rgba(226, 232, 240, 0.8);
    }
    .hero-stacked-1 {
      transform: rotate(-1.5deg) translateY(-8px);
      z-index: 10;
    }
    .hero-stacked-2 {
      transform: rotate(2deg) translateY(12px) translateX(10px);
      z-index: 20;
    }
    .hero-stacked-main {
      z-index: 30;
    }
    /* Tab active indicator */
    .filter-tab.active {
      background-color: #1e40af;
      color: #ffffff;
      border-color: #1e40af;
    }

/* roulang page: category3 */
:root {
      --primary: #1e40af;
      --primary-light: #2563eb;
      --bg-canvas: #ffffff;
      --bg-subtle: #f8fafc;
      --border-color: #e2e8f0;
      --text-main: #0f172a;
      --text-muted: #64748b;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-canvas);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .code-box-shadow {
      box-shadow: 0 20px 40px -15px rgba(30, 64, 175, 0.08), 0 0 0 1px rgba(226, 232, 240, 0.8);
    }
    .tech-grid-pattern {
      background-image: radial-gradient(rgba(30, 64, 175, 0.08) 1px, transparent 1px);
      background-size: 24px 24px;
    }

/* roulang page: category4 */
:root {
      --primary: #1e40af;
      --primary-light: #2563eb;
      --bg-canvas: #ffffff;
      --bg-subtle: #f8fafc;
      --border-color: #e2e8f0;
      --text-main: #0f172a;
      --text-muted: #64748b;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-canvas);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .code-box-shadow {
      box-shadow: 0 20px 40px -15px rgba(30, 64, 175, 0.08), 0 0 0 1px rgba(226, 232, 240, 0.8);
    }
    .hero-stacked-1 {
      transform: rotate(-1.5deg) translateY(-8px);
      z-index: 10;
    }
    .hero-stacked-2 {
      transform: rotate(2deg) translateY(12px) translateX(10px);
      z-index: 20;
    }
    .hero-stacked-main {
      z-index: 30;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .accordion-content.active {
      max-height: 300px;
    }