/* roulang page: index */
:root {
      --brand-blue: #0D47A1;
      --brand-blue-hover: #082d6c;
      --brand-orange: #FF6D00;
      --brand-orange-hover: #e65100;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-dark: #0F172A;
      --text-main: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --card-radius: 12px;
      --card-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
      --card-hover-shadow: 0 12px 30px rgba(13, 71, 161, 0.12);
      --section-py: 85px;
    }

    /* Base Reset */
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      font-size: 15px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 顶部双行导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1030;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 15px rgba(15, 23, 42, 0.06);
      border-bottom: 1px solid var(--border-color);
    }
    .header-top {
      padding: 10px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.7);
    }
    .brand-logo {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--brand-blue);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .brand-logo i {
      color: var(--brand-orange);
    }
    .btn-brand-primary {
      background-color: var(--brand-blue);
      color: #fff;
      font-weight: 600;
      padding: 8px 18px;
      border-radius: 8px;
      border: 1px solid var(--brand-blue);
      transition: all 0.25s ease;
    }
    .btn-brand-primary:hover, .btn-brand-primary:focus {
      background-color: var(--brand-blue-hover);
      color: #fff;
      box-shadow: 0 4px 12px rgba(13, 71, 161, 0.25);
    }
    .btn-brand-orange {
      background-color: var(--brand-orange);
      color: #fff;
      font-weight: 600;
      padding: 8px 18px;
      border-radius: 8px;
      border: none;
      transition: all 0.25s ease;
    }
    .btn-brand-orange:hover, .btn-brand-orange:focus {
      background-color: var(--brand-orange-hover);
      color: #fff;
    }
    
    /* 导航底行：图标网格条 */
    .header-nav-grid {
      padding: 8px 0;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
    }
    .header-nav-grid::-webkit-scrollbar {
      display: none;
    }
    .nav-icon-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      color: var(--text-main);
      font-size: 0.88rem;
      font-weight: 600;
      border-radius: 6px;
      margin-right: 4px;
    }
    .nav-icon-link i {
      color: var(--brand-blue);
      font-size: 0.95rem;
    }
    .nav-icon-link:hover, .nav-icon-link.active {
      color: var(--brand-blue);
      background-color: rgba(13, 71, 161, 0.08);
    }

    /* 板块排版公用 */
    .section-spacing {
      padding-top: var(--section-py);
      padding-bottom: var(--section-py);
    }
    .section-title-wrap {
      margin-bottom: 45px;
    }
    .section-eyebrow {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--brand-orange);
      margin-bottom: 8px;
      background: rgba(255, 109, 0, 0.1);
      padding: 4px 12px;
      border-radius: 20px;
    }
    .section-main-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }
    .app-card {
      background: var(--bg-white);
      border-radius: var(--card-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      height: 100%;
      overflow: hidden;
    }
    .app-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }

    /* Hero：提问式获客 + 痛点卡片首屏 */
    .hero-section {
      background: linear-gradient(135deg, rgba(13, 71, 161, 0.04) 0%, rgba(248, 250, 252, 0.9) 100%), url('/assets/images/6ee130269b047c1f.jpg') center/cover no-repeat;
      position: relative;
      padding: 90px 0 80px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(13, 71, 161, 0.12);
      color: var(--brand-blue);
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .hero-title {
      font-size: 2.6rem;
      font-weight: 900;
      color: var(--text-dark);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }
    .hero-title span {
      color: var(--brand-blue);
    }
    .hero-desc {
      font-size: 1.05rem;
      color: var(--text-main);
      margin-bottom: 30px;
      max-width: 620px;
    }
    .hero-form-card {
      background: #ffffff;
      padding: 30px;
      border-radius: 14px;
      box-shadow: 0 15px 40px rgba(15, 23, 42, 0.1);
      border: 1px solid rgba(226, 232, 240, 0.9);
    }
    .hero-form-card .form-control {
      padding: 12px 14px;
      font-size: 0.95rem;
      border-radius: 8px;
      border: 1px solid #CBD5E1;
    }
    .hero-form-card .form-control:focus {
      border-color: var(--brand-blue);
      box-shadow: 0 0 0 3px rgba(13, 71, 161, 0.15);
    }

    /* 热门入口矩阵区 */
    .portal-box {
      padding: 24px 20px;
      text-align: center;
      border-radius: 12px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      transition: all 0.3s;
    }
    .portal-box:hover {
      border-color: var(--brand-blue);
      transform: translateY(-5px);
      box-shadow: var(--card-hover-shadow);
    }
    .portal-icon {
      width: 54px;
      height: 54px;
      line-height: 54px;
      border-radius: 12px;
      background: rgba(13, 71, 161, 0.08);
      color: var(--brand-blue);
      font-size: 1.5rem;
      margin: 0 auto 16px;
    }

    /* 实时数据看板条 */
    .metric-num {
      font-size: 2.3rem;
      font-weight: 800;
      color: var(--brand-blue);
      line-height: 1;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 0.92rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 对比表格/卡片 */
    .contrast-box {
      background: #fff;
      border-radius: 12px;
      padding: 28px;
      border: 1px solid var(--border-color);
      height: 100%;
    }
    .contrast-box.highlight {
      border: 2px solid var(--brand-blue);
      position: relative;
    }
    .contrast-box.highlight::before {
      content: "专线推荐";
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--brand-orange);
      color: #fff;
      font-size: 0.75rem;
      padding: 2px 10px;
      border-radius: 10px;
      font-weight: 700;
    }

    /* 深色技术理念底座 */
    .dark-tech-section {
      background-color: #0F172A;
      color: #F8FAFC;
      padding-top: var(--section-py);
      padding-bottom: var(--section-py);
    }
    .dark-tech-section .section-main-title {
      color: #FFFFFF;
    }
    .dark-tech-section .section-subtitle {
      color: #94A3B8;
    }
    .dark-card {
      background: #1E293B;
      border: 1px solid #334155;
      padding: 26px;
      border-radius: 12px;
      height: 100%;
    }
    .dark-card h4 {
      color: #38BDF8;
      font-size: 1.15rem;
      margin-bottom: 10px;
    }
    .dark-card p {
      color: #CBD5E1;
      font-size: 0.92rem;
      margin: 0;
    }

    /* 时间轴里程碑 */
    .milestone-track {
      position: relative;
      border-left: 3px solid rgba(13, 71, 161, 0.2);
      padding-left: 28px;
      margin-left: 10px;
    }
    .milestone-step {
      position: relative;
      margin-bottom: 35px;
    }
    .milestone-step::before {
      content: "";
      position: absolute;
      left: -35px;
      top: 4px;
      width: 14px;
      height: 14px;
      background: var(--brand-blue);
      border-radius: 50%;
      border: 3px solid #fff;
      box-shadow: 0 0 0 2px var(--brand-blue);
    }
    .milestone-step:last-child {
      margin-bottom: 0;
    }

    /* 手风琴改造 */
    .custom-accordion .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: 10px !important;
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .custom-accordion .accordion-button {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      background-color: #ffffff;
      padding: 16px 20px;
    }
    .custom-accordion .accordion-button:not(.collapsed) {
      color: var(--brand-blue);
      background-color: rgba(13, 71, 161, 0.05);
      box-shadow: none;
    }
    .custom-accordion .accordion-body {
      color: var(--text-main);
      font-size: 0.93rem;
      line-height: 1.7;
      background-color: #ffffff;
      padding: 18px 20px;
    }

    /* 页脚 */
    .site-footer {
      background: #0B1120;
      color: #94A3B8;
      font-size: 0.9rem;
      padding-top: 60px;
      padding-bottom: 30px;
      border-top: 1px solid #1E293B;
    }
    .footer-title {
      color: #F8FAFC;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links li {
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }
    .footer-bottom {
      margin-top: 45px;
      padding-top: 20px;
      border-top: 1px solid #1E293B;
      font-size: 0.82rem;
      color: #64748B;
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 1.95rem;
      }
      .section-main-title {
        font-size: 1.65rem;
      }
      .section-spacing {
        padding-top: 55px;
        padding-bottom: 55px;
      }
    }