/* roulang page: index */
:root {
      --primary: #1A5F7A;
      --primary-dark: #0E3B4B;
      --accent: #D4A853;
      --accent-hover: #C09640;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --text: #2C3E50;
      --text-secondary: #5A6F7C;
      --text-title: #0E3B4B;
      --border: #E0E6ED;
      --radius: 12px;
      --radius-sm: 8px;
      --shadow: 0 2px 12px rgba(14, 59, 75, 0.06);
      --shadow-hover: 0 6px 20px rgba(14, 59, 75, 0.12);
      --nav-width: 240px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "SF Pro Text", sans-serif;
      --bs-primary: #1A5F7A;
      --bs-primary-rgb: 26, 95, 122;
      --bs-body-bg: #F7F9FC;
      --bs-body-color: #2C3E50;
      --bs-border-radius: 12px;
      --bs-card-border-color: #E0E6ED;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s;
    }

    a:hover {
      color: var(--accent);
    }

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

    button, .btn {
      font-family: var(--font-sans);
      cursor: pointer;
    }

    h1, h2, h3, h4, h5, h6 {
      color: var(--text-title);
      font-weight: 700;
      line-height: 1.3;
      margin-top: 0;
    }

    h1 {
      font-size: 42px;
    }

    h2 {
      font-size: 32px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary);
    }

    .text-accent {
      color: var(--accent);
    }

    .bg-primary-dark {
      background-color: var(--primary-dark);
    }

    .bg-primary {
      background-color: var(--primary);
    }

    .section-padding {
      padding: 100px 0;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 桌面端左侧竖向导航 */
    .admin-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: var(--primary-dark);
      color: #FFFFFF;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 30px 20px;
      z-index: 1030;
      overflow-y: auto;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
    }

    .nav-brand {
      text-align: center;
      margin-bottom: 40px;
    }

    .nav-brand img {
      width: 50px;
      height: 50px;
      object-fit: contain;
      margin: 0 auto 10px;
      background: rgba(255,255,255,0.15);
      border-radius: 12px;
      padding: 6px;
    }

    .nav-brand .brand-name {
      font-size: 22px;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 1px;
    }

    .nav-menu {
      list-style: none;
      padding: 0;
      margin: 0;
      width: 100%;
      flex: 1;
    }

    .nav-menu li {
      margin-bottom: 8px;
    }

    .nav-menu a {
      display: block;
      padding: 12px 18px;
      color: rgba(255,255,255,0.85);
      font-size: 16px;
      border-radius: 8px;
      transition: all 0.25s;
      font-weight: 500;
      text-decoration: none;
      border-left: 3px solid transparent;
    }

    .nav-menu a:hover,
    .nav-menu a.active {
      background: rgba(255,255,255,0.08);
      color: var(--accent);
      border-left: 3px solid var(--accent);
    }

    .nav-footer-text {
      font-size: 14px;
      color: #8FA4B0;
      margin-top: auto;
      padding-top: 30px;
      text-align: center;
      width: 100%;
    }

    .main-content {
      margin-left: var(--nav-width);
      min-height: 100vh;
      background-color: var(--bg);
    }

    /* 移动端顶部导航 */
    .mobile-nav {
      display: none;
      background-color: var(--primary-dark);
      color: white;
      padding: 12px 20px;
      align-items: center;
      justify-content: space-between;
      position: sticky;
      top: 0;
      z-index: 1040;
    }

    .mobile-brand {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .mobile-brand img {
      width: 36px;
      height: 36px;
      background: rgba(255,255,255,0.2);
      border-radius: 8px;
      padding: 4px;
    }

    .mobile-brand span {
      font-weight: 700;
      font-size: 20px;
    }

    .navbar-toggler {
      border: none;
      background: transparent;
      color: white;
      font-size: 28px;
      padding: 4px 8px;
    }

    .mobile-menu {
      background-color: #0E3B4B;
      border-top: 1px solid rgba(255,255,255,0.2);
    }

    .mobile-menu .nav-link {
      color: rgba(255,255,255,0.9);
      padding: 14px 20px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .mobile-menu .nav-link:hover {
      background: rgba(255,255,255,0.1);
      color: var(--accent);
    }

    /* Hero */
    .hero-section {
      background-color: var(--white);
      display: flex;
      align-items: center;
      min-height: 80vh;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-text {
      flex: 1;
    }

    .hero-image {
      flex: 1;
      position: relative;
    }

    .hero-image img {
      width: 100%;
      height: auto;
      border-radius: 20px;
      box-shadow: var(--shadow);
    }

    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26, 95, 122, 0.05);
      border-radius: 20px;
      pointer-events: none;
    }

    .btn-primary-custom {
      background: var(--accent);
      border: none;
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-size: 16px;
      transition: all 0.3s;
      display: inline-block;
      text-decoration: none;
    }

    .btn-primary-custom:hover {
      background: var(--accent-hover);
      box-shadow: 0 4px 12px rgba(212, 168, 83, 0.4);
      color: white;
      transform: translateY(-1px);
    }

    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-size: 16px;
      transition: all 0.3s;
      display: inline-block;
      text-decoration: none;
    }

    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
    }

    /* 卡片通用 */
    .card-custom {
      background: white;
      border-radius: var(--radius);
      padding: 32px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
      transition: all 0.3s ease;
      height: 100%;
    }

    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .icon-box {
      width: 48px;
      height: 48px;
      background: #F0F4F8;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      flex-shrink: 0;
    }

    .advantage-card {
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }

    .service-card {
      text-align: center;
    }

    .service-icon {
      width: 64px;
      height: 64px;
      margin: 0 auto 20px;
      background: #F0F4F8;
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .data-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    .solution-card {
      display: flex;
      gap: 30px;
      padding: 28px 0;
      border-bottom: 1px dashed var(--border);
      align-items: center;
    }

    .solution-thumb {
      width: 200px;
      height: 160px;
      border-radius: 12px;
      object-fit: cover;
      flex-shrink: 0;
    }

    .faq-accordion .accordion-button {
      font-weight: 600;
      font-size: 18px;
      color: var(--text-title);
      background: white;
      box-shadow: none;
      border-bottom: 1px solid var(--border);
      padding: 20px 16px;
    }

    .faq-accordion .accordion-button:not(.collapsed) {
      background: #F7F9FC;
      color: var(--primary);
    }

    .faq-accordion .accordion-body {
      background: #F7F9FC;
      padding: 20px;
    }

    .q-badge {
      color: var(--accent);
      font-weight: 700;
      font-size: 20px;
      margin-right: 8px;
    }

    .cta-block {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    .footer-custom {
      background: var(--primary-dark);
      color: #B0C4CF;
      padding: 60px 0 0;
    }

    .footer-custom h5 {
      color: white;
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .footer-custom a {
      color: #B0C4CF;
      text-decoration: none;
    }

    .footer-custom a:hover {
      color: var(--accent);
    }

    .copyright-bar {
      background: #0A2E3A;
      color: #8FA4B0;
      font-size: 14px;
      padding: 20px 0;
      margin-top: 40px;
    }

    @media (max-width: 991.98px) {
      .admin-nav {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .main-content {
        margin-left: 0;
      }
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .solution-card {
        flex-direction: column;
        align-items: flex-start;
      }
      .solution-thumb {
        width: 100%;
        height: auto;
      }
      h1 {
        font-size: 34px;
      }
      .section-padding {
        padding: 70px 0;
      }
    }

    @media (max-width: 767.98px) {
      .advantage-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
      }
      .data-number {
        font-size: 38px;
      }
    }