/* roulang page: index */
:root {
      --primary: #1A4DB8;
      --primary-hover: #163E9B;
      --accent: #00B4D8;
      --accent-warm: #FF6B35;
      --dark-navy: #0B1930;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --shadow-subtle: 0 4px 20px -2px rgba(26, 77, 184, 0.06), 0 2px 6px -1px rgba(0, 0, 0, 0.03);
      --shadow-hover: 0 12px 30px -4px rgba(26, 77, 184, 0.12), 0 4px 10px -2px rgba(0, 0, 0, 0.05);
      --transition-standard: all 0.25s ease-in-out;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-main);
      background-color: var(--bg-white);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 顶层信息栏 */
    .top-utility-bar {
      height: 38px;
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .top-utility-bar a {
      color: var(--text-muted);
      text-decoration: none;
      transition: var(--transition-standard);
    }
    .top-utility-bar a:hover {
      color: var(--primary);
    }

    /* 主导航栏 */
    .main-header {
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
      position: sticky;
      top: 0;
      z-index: 1030;
      padding: 14px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .brand-logo {
      font-weight: 800;
      font-size: 1.35rem;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .brand-logo:hover {
      color: var(--primary-hover);
    }
    .brand-badge {
      background-color: #EFF6FF;
      color: var(--primary);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 20px;
      border: 1px solid #DBEAFE;
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: #10B981;
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      animation: pulse 1.8s infinite cubic-bezier(0.66, 0, 0, 1);
    }
    @keyframes pulse {
      to {
        box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
      }
    }
    .nav-link-custom {
      font-weight: 600;
      color: #334155;
      text-decoration: none;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      transition: var(--transition-standard);
      font-size: 0.95rem;
    }
    .nav-link-custom:hover,
    .nav-link-custom.active {
      color: var(--primary);
      background-color: #F8FAFC;
    }
    .btn-action-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      font-weight: 600;
      border-radius: 6px;
      padding: 8px 20px;
      text-decoration: none;
      border: 1px solid var(--primary);
      transition: var(--transition-standard);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .btn-action-primary:hover {
      background-color: var(--primary-hover);
      color: #FFFFFF;
      border-color: var(--primary-hover);
      transform: translateY(-1px);
    }

    /* 板块结构规范 */
    .app-section {
      padding: 90px 0;
      position: relative;
    }
    .bg-canvas-light {
      background-color: var(--bg-light);
    }
    .bg-canvas-white {
      background-color: var(--bg-white);
    }
    .bg-canvas-dark {
      background-color: var(--dark-navy);
      color: #F8FAFC;
    }

    /* 标题统一样式 */
    .section-eyebrow {
      display: inline-block;
      color: var(--primary);
      font-weight: 700;
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-headline {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-description {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 820px;
      margin: 0 auto 40px auto;
      line-height: 1.7;
    }

    /* 卡片体系 */
    .system-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-subtle);
      transition: var(--transition-standard);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .system-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #CBD5E1;
    }

    /* 矮横幅 Hero 结构 */
    .hero-banner-strip {
      background: linear-gradient(135deg, #F8FAFC 0%, #EDF2F7 100%);
      border-bottom: 1px solid var(--border-color);
      padding: 60px 0 50px 0;
    }
    .hero-headline-wrap h1 {
      font-size: 2.4rem;
      font-weight: 800;
      color: #0F172A;
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .hero-intro-text {
      color: #475569;
      font-size: 1.05rem;
      line-height: 1.75;
      max-width: 880px;
      margin-bottom: 24px;
    }
    .hero-metrics-pill-group {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .hero-metric-pill {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 50px;
      padding: 6px 16px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
    }

    /* 流程时间线卡片 */
    .step-badge {
      width: 38px;
      height: 38px;
      background: #EFF6FF;
      color: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
      margin-bottom: 16px;
      border: 1px solid #BFDBFE;
    }

    /* 常见解答组件定制 */
    .accordion-button:not(.collapsed) {
      color: var(--primary);
      background-color: #EFF6FF;
      box-shadow: inset 0 -1px 0 rgba(0,0,0,.125);
    }
    .accordion-button:focus {
      border-color: #93C5FD;
      box-shadow: 0 0 0 0.25rem rgba(26, 77, 184, 0.25);
    }
    .accordion-item {
      border: 1px solid var(--border-color);
      margin-bottom: 12px;
      border-radius: var(--radius-sm) !important;
      overflow: hidden;
    }

    /* 页脚设计 */
    .site-footer {
      background-color: #0F172A;
      color: #94A3B8;
      font-size: 0.9rem;
      padding: 70px 0 30px 0;
      border-top: 1px solid #1E293B;
    }
    .site-footer a {
      color: #CBD5E1;
      text-decoration: none;
      transition: var(--transition-standard);
    }
    .site-footer a:hover {
      color: #FFFFFF;
    }
    .footer-divider {
      border-color: #334155;
      margin: 40px 0 24px 0;
    }

    /* 响应式调整 */
    @media (max-width: 991px) {
      .hero-headline-wrap h1 {
        font-size: 2rem;
      }
      .section-headline {
        font-size: 1.8rem;
      }
      .app-section {
        padding: 60px 0;
      }
    }
    @media (max-width: 576px) {
      .hero-headline-wrap h1 {
        font-size: 1.65rem;
      }
      .section-headline {
        font-size: 1.45rem;
      }
      .top-utility-bar {
        display: none;
      }
    }