/* roulang page: index */
:root {
      --bg-page: #F8FAFC;
      --bg-surface: #FFFFFF;
      --bg-subtle: #EFF6FF;
      --bg-dark-contrast: #0F172A;
      --primary: #1D4ED8;
      --primary-hover: #1E40AF;
      --accent: #7C3AED;
      --accent-light: #EDE9FE;
      --text-main: #0F172A;
      --text-secondary: #475569;
      --text-muted: #94A3B8;
      --border-light: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 6px -1px rgba(15, 23, 42, 0.04);
      --shadow-card: 0 10px 30px -5px rgba(29, 78, 216, 0.05), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
      --shadow-hover: 0 20px 40px -10px rgba(29, 78, 216, 0.12), 0 8px 16px -4px rgba(15, 23, 42, 0.05);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.7;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

    /* 顶部双行吸顶导航 */
    .sticky-header-wrapper {
      position: sticky;
      top: 0;
      z-index: 1040;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-topbar {
      padding: 10px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
      font-size: 0.875rem;
    }
    .brand-logo-text {
      font-weight: 800;
      font-size: 1.35rem;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .search-input-group {
      max-width: 380px;
      position: relative;
    }
    .search-input-group input {
      border-radius: 9999px;
      padding-left: 36px;
      font-size: 0.85rem;
      border: 1px solid var(--border-light);
      background-color: var(--bg-subtle);
    }
    .search-input-group i {
      position: absolute;
      left: 12px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
      z-index: 5;
    }
    .hot-trends {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.775rem;
    }
    .hot-tag {
      padding: 2px 8px;
      border-radius: 9999px;
      background: #F1F5F9;
      color: var(--text-secondary);
      border: 1px solid #E2E8F0;
    }
    .hot-tag:hover {
      background: var(--bg-subtle);
      color: var(--primary);
      border-color: #BFDBFE;
    }
    .nav-channels {
      padding: 6px 0;
    }
    .channel-link {
      font-size: 0.925rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }
    .channel-link:hover, .channel-link.active {
      color: var(--primary);
      background-color: var(--bg-subtle);
      font-weight: 600;
    }

    /* 通用组件 */
    .section-wrap {
      padding: 92px 0;
      position: relative;
    }
    .section-title-wrap {
      margin-bottom: 54px;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 9999px;
      font-size: 0.8rem;
      font-weight: 600;
      background: var(--bg-subtle);
      color: var(--primary);
      margin-bottom: 12px;
      border: 1px solid #BFDBFE;
    }
    .section-h2 {
      font-size: 2.15rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-secondary);
      max-width: 780px;
      margin: 14px auto 0;
      line-height: 1.8;
    }
    .btn-main {
      background-color: var(--primary);
      color: #fff;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 10px;
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 4px 14px rgba(29, 78, 216, 0.25);
    }
    .btn-main:hover {
      background-color: var(--primary-hover);
      color: #fff;
      transform: translateY(-2px);
    }
    .btn-outline-main {
      border: 1.5px solid var(--border-light);
      background: #fff;
      color: var(--text-main);
      font-weight: 600;
      padding: 12px 24px;
      border-radius: 10px;
    }
    .btn-outline-main:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--bg-subtle);
    }
    .card-pro {
      background: var(--bg-surface);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      overflow: hidden;
      height: 100%;
    }
    .card-pro:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #BFDBFE;
    }

    /* 工业参数首屏 */
    .hero-industrial {
      background: radial-gradient(circle at 80% 20%, #DBEAFE 0%, #F8FAFC 60%), linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
      padding: 70px 0 60px;
      border-bottom: 1px solid var(--border-light);
    }
    .param-spec-box {
      background: #FFFFFF;
      border: 1px solid #CBD5E1;
      border-radius: var(--radius-md);
      padding: 18px;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 0.85rem;
    }
    .param-spec-item {
      display: flex;
      justify-content: space-between;
      padding: 6px 0;
      border-bottom: 1px dashed #E2E8F0;
    }
    .param-spec-item:last-child {
      border-bottom: none;
    }

    /* 深色区块对比 */
    .dark-section-box {
      background-color: var(--bg-dark-contrast);
      color: #F8FAFC;
    }
    .dark-section-box .section-h2, .dark-section-box h3, .dark-section-box h4 {
      color: #FFFFFF;
    }
    .dark-section-box .text-muted-custom {
      color: #94A3B8;
    }
    .dark-card {
      background: #1E293B;
      border: 1px solid #334155;
      border-radius: var(--radius-lg);
      padding: 28px;
    }

    /* 流程轴 */
    .method-step-num {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--bg-subtle);
      color: var(--primary);
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.15rem;
      border: 2px solid #BFDBFE;
      margin-bottom: 16px;
    }

    /* 页脚 */
    .footer-pro {
      background: #0B1120;
      color: #94A3B8;
      padding: 72px 0 36px;
      font-size: 0.925rem;
      border-top: 1px solid #1E293B;
    }
    .footer-pro h5 {
      color: #F8FAFC;
      font-size: 1.05rem;
      margin-bottom: 20px;
      font-weight: 600;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #60A5FA;
    }

    /* 移动端优化 */
    @media (max-width: 991px) {
      .section-wrap {
        padding: 60px 0;
      }
      .section-h2 {
        font-size: 1.75rem;
      }
      .sticky-header-wrapper {
        position: relative;
      }
    }