/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --primary-deep: #0F3F8C;
      --primary-light-bg: #F6F9FE;
      --primary-soft: rgba(26,95,220,0.08);
      --success: #10B981;
      --warning: #F59E0B;
      --danger: #EF4444;
      --text-main: #1E293B;
      --text-secondary: #64748B;
      --bg-light: #F8FAFD;
      --bg-white: #FFFFFF;
      --border-light: #E2E8F0;
      --border-card: #E8EDF4;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.08);
      --radius-xs: 8px;
      --radius-sm: 10px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      color: var(--text-main);
      background-color: #ffffff;
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .nav-link, .btn, .data-number {
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.04);
      height: 72px;
      padding: 0;
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .navbar .container-custom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo-wrap {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-img {
      height: 36px;
      width: auto;
    }
    .logo-text {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-link-item {
      font-size: 15px;
      font-weight: 500;
      color: #475569;
      position: relative;
      padding: 8px 0;
      cursor: pointer;
      transition: color 0.2s;
    }
    .nav-link-item::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: width 0.25s ease, left 0.25s ease;
    }
    .nav-link-item:hover,
    .nav-link-item.active {
      color: var(--primary);
    }
    .nav-link-item:hover::after,
    .nav-link-item.active::after {
      width: 100%;
      left: 0;
    }
    .mega-trigger {
      position: relative;
    }
    .mega-panel {
      position: absolute;
      top: calc(100% + 12px);
      right: 0;
      width: 560px;
      background: #ffffff;
      box-shadow: var(--shadow-lg);
      border-radius: var(--radius-md);
      padding: 20px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(6px);
      transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s;
      z-index: 1030;
    }
    .mega-trigger:hover .mega-panel {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .mega-card {
      background: #ffffff;
      border-radius: 10px;
      padding: 12px 10px;
      text-align: center;
      transition: background 0.2s;
      cursor: pointer;
    }
    .mega-card:hover {
      background: #F6F9FE;
    }
    .mega-icon {
      width: 40px;
      height: 40px;
      margin: 0 auto 8px;
      color: var(--primary);
      font-size: 28px;
    }
    .mega-title {
      font-weight: 600;
      font-size: 15px;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .mega-desc {
      font-size: 12px;
      color: #94A3B8;
      line-height: 1.5;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text-main);
    }
    @media (max-width: 992px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px 24px;
        box-shadow: var(--shadow-md);
        gap: 16px;
        border-top: 1px solid var(--border-light);
      }
      .nav-menu.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mega-panel {
        position: static;
        width: 100%;
        box-shadow: none;
        transform: none;
        opacity: 1;
        visibility: visible;
        grid-template-columns: 1fr 1fr;
        margin-top: 8px;
        padding: 0;
      }
      .mega-trigger:hover .mega-panel {
        display: grid;
      }
    }
    /* 区块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 64px 0;
      }
    }
    /* Hero */
    .hero-bg {
      background: linear-gradient(180deg, #F4F7FC 0%, #FFFFFF 100%);
    }
    .hero-title {
      font-size: 42px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 28px;
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-xs);
      font-weight: 600;
      transition: background 0.2s;
      display: inline-block;
    }
    .btn-primary-custom:hover {
      background: var(--primary-deep);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 26px;
      border-radius: var(--radius-xs);
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-outline-custom:hover {
      background: rgba(26,95,220,0.1);
      color: var(--primary);
    }
    .hero-metrics {
      display: flex;
      gap: 32px;
      margin-top: 32px;
    }
    .metric-item {
      text-align: left;
    }
    .metric-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-secondary);
    }
    .hero-img {
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: auto;
    }
    /* 指标看板 */
    .data-card {
      background: #fff;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      padding: 28px 24px;
      transition: all 0.3s;
      height: 100%;
    }
    .data-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .data-big {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1;
    }
    .trend-up { color: var(--success); }
    .trend-down { color: var(--danger); }
    /* 服务卡片 */
    .service-card {
      background: #fff;
      border: 1px solid var(--border-card);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: 0.25s;
      height: 100%;
    }
    .service-card:hover {
      border-color: var(--primary);
      transform: translateY(-6px);
      box-shadow: var(--shadow-sm);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 44px;
    }
    /* 对比卡片 */
    .compare-card {
      border-radius: var(--radius-md);
      padding: 32px 24px;
      height: 100%;
    }
    .compare-left {
      background: rgba(0,0,0,0.02);
    }
    .compare-right {
      background: rgba(26,95,220,0.04);
      border-left: 4px solid var(--primary);
    }
    .vs-badge {
      width: 48px;
      height: 48px;
      background: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      font-size: 18px;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #F8FAFD;
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-item {
      border: 1px solid var(--border-card);
      border-radius: 10px;
      margin-bottom: 12px;
    }
    .faq-number {
      font-weight: 700;
      margin-right: 12px;
      color: var(--text-secondary);
    }
    .accordion-button:not(.collapsed) .faq-number {
      color: var(--primary);
    }
    /* 表单 */
    .form-control {
      height: 48px;
      border-radius: var(--radius-xs);
      border: 1px solid #DDE3EC;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,95,220,0.12);
    }
    /* 页脚 */
    .footer {
      background: #0F172A;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    .footer h5 {
      color: white;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer a {
      color: #CBD5E1;
      font-size: 14px;
    }
    .footer a:hover {
      color: white;
    }
    .copyright {
      border-top: 1px solid #1E293B;
      margin-top: 40px;
      padding-top: 20px;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .hero-title { font-size: 30px; }
      .data-big { font-size: 36px; }
    }