/* roulang page: index */
:root {
      --brand-primary: #0A4D68;
      --brand-secondary: #088395;
      --brand-accent: #05BFDB;
      --brand-dark: #081621;
      --brand-surface: #F4F7F9;
      --brand-card-bg: #FFFFFF;
      --text-main: #1A2530;
      --text-muted: #5A6E7F;
      --border-light: rgba(10, 77, 104, 0.08);
      --shadow-sm: 0 4px 16px rgba(10, 77, 104, 0.04);
      --shadow-hover: 0 12px 28px rgba(10, 77, 104, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.75;
      overflow-x: hidden;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 顶部工具条 */
    .top-utility-bar {
      background-color: var(--brand-dark);
      color: #94A3B8;
      font-size: 0.85rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-utility-bar a {
      color: #CBD5E1;
    }
    .top-utility-bar a:hover {
      color: var(--brand-accent);
    }
    .lang-pill {
      background: rgba(255, 255, 255, 0.1);
      border-radius: 20px;
      padding: 2px 10px;
      font-size: 0.75rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 主导航 */
    .sticky-navbar {
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 12px rgba(10, 77, 104, 0.06);
      position: sticky;
      top: 0;
      z-index: 1030;
      transition: all 0.3s ease;
    }
    .brand-logo {
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--brand-primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo i {
      color: var(--brand-secondary);
      font-size: 1.6rem;
    }
    .nav-link {
      font-weight: 500;
      color: #334155 !important;
      padding: 0.5rem 0.9rem !important;
      border-radius: 6px;
      transition: all 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--brand-primary) !important;
      background-color: rgba(10, 77, 104, 0.04);
    }
    .btn-brand-primary {
      background-color: var(--brand-primary);
      color: #FFFFFF !important;
      border-radius: 30px;
      padding: 8px 22px;
      font-weight: 600;
      border: 1px solid var(--brand-primary);
      box-shadow: 0 4px 12px rgba(10, 77, 104, 0.18);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .btn-brand-primary:hover {
      background-color: var(--brand-secondary);
      border-color: var(--brand-secondary);
      color: #FFFFFF;
      transform: translateY(-2px);
    }
    .btn-brand-outline {
      background-color: transparent;
      color: var(--brand-primary) !important;
      border-radius: 30px;
      padding: 8px 22px;
      font-weight: 600;
      border: 1.5px solid var(--brand-primary);
    }
    .btn-brand-outline:hover {
      background-color: var(--brand-primary);
      color: #FFFFFF !important;
    }

    /* 徽标 */
    .tag-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(10, 77, 104, 0.08);
      color: var(--brand-primary);
      font-size: 0.8rem;
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 30px;
      margin-bottom: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    /* 板块结构 */
    .section-py {
      padding: 85px 0;
    }
    .bg-surface {
      background-color: var(--brand-surface);
    }
    .bg-dark-slate {
      background-color: var(--brand-dark);
      color: #F8FAFC;
    }

    /* 卡片基础 */
    .custom-card {
      background: var(--brand-card-bg);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
      height: 100%;
    }
    .custom-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(10, 77, 104, 0.18);
    }

    /* 工业参数 Hero 首屏 */
    .hero-spec-section {
      background: linear-gradient(135deg, rgba(8, 22, 33, 0.94), rgba(10, 77, 104, 0.9)), url('/assets/images/9227ba4983ac2a38.jpg') center/cover no-repeat;
      color: #FFFFFF;
      padding: 100px 0 75px 0;
      position: relative;
    }
    .hero-h1 {
      font-size: clamp(2rem, 3.8vw, 3rem);
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 1.25rem;
    }
    .hero-lead {
      font-size: 1.08rem;
      line-height: 1.8;
      color: #E2E8F0;
      margin-bottom: 2rem;
    }
    .spec-dashboard-card {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-lg);
      padding: 24px;
    }
    .spec-grid-item {
      border-right: 1px solid rgba(255, 255, 255, 0.1);
      padding: 12px 18px;
    }
    .spec-grid-item:last-child {
      border-right: none;
    }
    .spec-val {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--brand-accent);
      font-family: monospace;
      line-height: 1.1;
    }
    .spec-label {
      font-size: 0.8rem;
      color: #CBD5E1;
      margin-top: 4px;
    }

    /* 常见阻碍对比卡 */
    .blocker-item {
      border-left: 3px solid #EF4444;
      background: #FEF2F2;
      border-radius: 4px var(--radius-sm) var(--radius-sm) 4px;
      padding: 14px 18px;
      margin-bottom: 12px;
    }
    .resolution-item {
      border-left: 3px solid #10B981;
      background: #ECFDF5;
      border-radius: 4px var(--radius-sm) var(--radius-sm) 4px;
      padding: 14px 18px;
      margin-bottom: 12px;
    }

    /* 步骤流式卡 */
    .step-number-bubble {
      width: 44px;
      height: 44px;
      background: var(--brand-primary);
      color: #FFF;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.15rem;
      box-shadow: 0 4px 10px rgba(10, 77, 104, 0.25);
      margin-bottom: 1rem;
    }

    /* 指标带 */
    .metric-strip-card {
      border: none;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
      padding: 24px 20px;
      text-align: center;
    }

    /* FAQ 手风琴重塑 */
    .accordion-button:not(.collapsed) {
      color: var(--brand-primary);
      background-color: rgba(10, 77, 104, 0.05);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: rgba(10, 77, 104, 0.2);
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      margin-bottom: 12px;
      border-radius: var(--radius-sm) !important;
      overflow: hidden;
    }

    /* 页脚 */
    footer {
      background-color: var(--brand-dark);
      color: #94A3B8;
      padding: 70px 0 25px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
    }
    footer h5 {
      color: #F8FAFC;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    footer ul {
      list-style: none;
      padding: 0;
    }
    footer ul li {
      margin-bottom: 0.65rem;
    }
    footer ul li a {
      color: #94A3B8;
      font-size: 0.9rem;
    }
    footer ul li a:hover {
      color: var(--brand-accent);
      padding-left: 4px;
    }
    .copyright-bar {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 25px;
      margin-top: 45px;
      font-size: 0.85rem;
    }

    /* 移动端约束 */
    @media (max-width: 768px) {
      .hero-spec-section {
        padding: 60px 0 45px 0;
      }
      .spec-grid-item {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        padding: 12px 0;
      }
      .section-py {
        padding: 55px 0;
      }
      .btn-brand-primary, .btn-brand-outline {
        min-height: 48px;
        width: 100%;
        margin-bottom: 8px;
      }
    }