/* roulang page: index */
:root {
      --primary-deep: #0A6E6E;
      --accent-orange: #F85C3C;
      --accent-orange-hover: #D94A2E;
      --bg-light: #F4F6F9;
      --card-white: #FFFFFF;
      --text-dark: #2E3A46;
      --text-muted: #6B7B8B;
      --border-light: #E9ECEF;
      --shadow-sm: 0 8px 24px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 16px 32px rgba(0, 0, 0, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --transition: 0.25s ease;
      --navbar-height: 64px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      padding-top: var(--navbar-height);
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, .h1, .h2, .h3 {
      font-weight: 600;
      letter-spacing: -0.2px;
    }
    h1 {
      font-size: 2.75rem;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 2rem;
    }
    h3 {
      font-size: 1.25rem;
    }
    .text-muted-custom {
      color: var(--text-muted);
    }
    a {
      color: var(--primary-deep);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: #085a5a;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .btn {
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 500;
      transition: all 0.25s ease;
      border: none;
      letter-spacing: 0.3px;
    }
    .btn-primary-custom {
      background-color: var(--accent-orange);
      color: white;
      border: 2px solid var(--accent-orange);
    }
    .btn-primary-custom:hover {
      background-color: var(--accent-orange-hover);
      border-color: var(--accent-orange-hover);
      color: white;
      transform: scale(1.02);
      box-shadow: 0 8px 16px rgba(248, 92, 60, 0.2);
    }
    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
    }
    .btn-outline-custom:hover {
      background-color: rgba(10, 110, 110, 0.05);
      border-color: #085a5a;
      color: #085a5a;
    }
    .navbar {
      height: var(--navbar-height);
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      padding: 0 1.5rem;
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-deep) !important;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary-deep) 0%, #0a5a5a 100%);
      border-radius: 8px;
      position: relative;
    }
    .logo-icon::after {
      content: "";
      position: absolute;
      width: 10px;
      height: 10px;
      background: var(--accent-orange);
      border-radius: 50%;
      top: 5px;
      right: 5px;
    }
    .nav-link {
      color: var(--text-dark) !important;
      font-weight: 500;
      font-size: 0.95rem;
      margin: 0 0.25rem;
      padding: 0.5rem 0.75rem !important;
      transition: var(--transition);
    }
    .nav-link:hover {
      color: var(--primary-deep) !important;
    }
    .navbar .btn {
      padding: 0.5rem 1.5rem;
    }
    .search-icon {
      color: var(--text-muted);
      font-size: 1.2rem;
      cursor: default;
      margin-right: 1rem;
    }
    section {
      padding: 5rem 0;
    }
    .container {
      max-width: 1140px;
    }
    /* Hero 分屏 */
    .hero-section {
      background-color: var(--bg-light);
      padding: 3rem 0 5rem;
    }
    .hero-left {
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .hero-right {
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .data-dashboard {
      display: flex;
      flex-wrap: wrap;
      gap: 1.5rem;
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(4px);
      border-radius: 24px;
      padding: 2rem;
      width: 100%;
      box-shadow: var(--shadow-sm);
    }
    .kpi-card {
      background: white;
      border-radius: 16px;
      padding: 1.5rem 1.2rem;
      flex: 1 1 120px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.02);
      text-align: center;
      transition: var(--transition);
    }
    .kpi-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent-orange);
      line-height: 1.2;
    }
    .kpi-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-top: 0.25rem;
    }
    /* 核心优势 */
    .advantage-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .advantage-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .advantage-icon {
      font-size: 2.5rem;
      color: var(--primary-deep);
      margin-bottom: 1rem;
    }
    /* 服务卡片 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .card-img-wrapper {
      position: relative;
      height: 180px;
      overflow: hidden;
    }
    .card-img-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .service-card:hover .card-img-wrapper img {
      transform: scale(1.03);
    }
    .img-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(10,110,110,0.3) 0%, rgba(10,110,110,0.05) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .img-overlay i {
      font-size: 2.5rem;
      color: white;
      text-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }
    .card-body-custom {
      padding: 1.5rem;
    }
    /* 数据对比 */
    .compare-pain {
      background: #f8f2f2;
      border-radius: 16px;
      padding: 2rem;
    }
    .compare-gain {
      background: #eef7f7;
      border-radius: 16px;
      padding: 2rem;
    }
    /* FAQ */
    .accordion-button {
      font-weight: 600;
      color: var(--text-dark);
      background: white;
      box-shadow: none;
      border: none;
      padding: 1rem 1.5rem;
    }
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
    }
    .accordion-button:not(.collapsed) {
      background-color: #F8FAFB;
      color: var(--primary-deep);
      box-shadow: none;
    }
    .accordion-button::after {
      background-image: none;
      content: "+";
      font-weight: 400;
      font-size: 1.5rem;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .accordion-button:not(.collapsed)::after {
      content: "−";
    }
    .accordion-button:focus {
      border-color: transparent;
      box-shadow: none;
    }
    .faq-indicator {
      width: 4px;
      background: var(--primary-deep);
      margin-right: 1rem;
      border-radius: 4px;
    }
    /* 表单 */
    .cta-section {
      background: linear-gradient(135deg, #E6F2F2 0%, #FFFFFF 100%);
      border-radius: 24px;
      padding: 3rem;
    }
    .form-control {
      border: 1px solid #CED4DA;
      border-radius: 8px;
      padding: 0.75rem 1rem;
    }
    .form-control:focus {
      border-color: var(--primary-deep);
      box-shadow: 0 0 0 0.2rem rgba(10,110,110,0.15);
    }
    footer {
      background: #1E2A33;
      color: #ADB5BD;
      padding: 3rem 0 2rem;
    }
    footer a {
      color: #ADB5BD;
      text-decoration: none;
    }
    footer a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 2.2rem;
      }
      .hero-section .row {
        flex-direction: column-reverse;
      }
      .data-dashboard {
        justify-content: center;
      }
      .navbar .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 12px;
        box-shadow: 0 12px 28px rgba(0,0,0,0.1);
      }
      .cta-section .row {
        flex-direction: column;
      }
      section {
        padding: 3rem 0;
      }
    }