/* roulang page: index */
/* ----- 设计变量与全局重置 ----- */
    :root {
      --primary-deep: #0B1D3A;
      --primary-hover: #152C50;
      --accent-gold: #D4A853;
      --accent-gold-hover: #C49A3F;
      --silver: #A8B9D1;
      --bg-light: #F4F7FC;
      --text-title: #0B1D3A;
      --text-body: #3A4A5C;
      --text-muted: #6B7B8D;
      --white: #FFFFFF;
      --border-light: #E8EDF3;
      --shadow-sm: 0 2px 8px rgba(11,29,58,0.04);
      --shadow-card: 0 2px 12px rgba(11,29,58,0.06);
      --shadow-hover: 0 8px 24px rgba(11,29,58,0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition: 0.25s ease;
      --container-max: 1200px;
      --section-gap: 96px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
      background-color: var(--white);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
      font-weight: 600;
    }

    h1, h2, h3 {
      color: var(--text-title);
    }

    h1 {
      font-size: 42px;
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: 32px;
      line-height: 1.3;
      font-weight: 600;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 600;
    }

    .section {
      padding: var(--section-gap) 0;
    }

    /* ----- 导航 Header ----- */
    .site-header {
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 68px;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary-deep);
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary-deep);
      clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
      display: inline-block;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
    }
    .nav-links a {
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--silver);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary-deep);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-box {
      background: var(--bg-light);
      border-radius: 20px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      width: 180px;
      transition: width var(--transition);
      border: 1px solid transparent;
    }
    .search-box:focus-within {
      width: 240px;
      border-color: var(--silver);
      background: white;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      width: 100%;
      font-size: 14px;
      color: var(--text-body);
    }
    .btn-primary {
      background: var(--primary-deep);
      color: white;
      border-radius: var(--radius-sm);
      padding: 10px 24px;
      font-size: 15px;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .mobile-menu-toggle {
      display: none;
      font-size: 24px;
      color: var(--primary-deep);
    }

    /* Hero 首屏 */
    .hero {
      background: linear-gradient(135deg, #F4F7FC 0%, #E8EDF3 100%);
      padding: 80px 0;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-content {
      flex: 1 1 55%;
    }
    .hero-content h1 {
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-accent {
      background: var(--accent-gold);
      color: white;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
    }
    .btn-accent:hover {
      background: var(--accent-gold-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(11,29,58,0.04);
    }
    .hero-image {
      flex: 1 1 45%;
      text-align: right;
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
    }

    /* 实时指标看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      background: var(--bg-light);
      border-radius: var(--radius-md);
      padding: 32px;
      margin-top: -40px;
      position: relative;
      z-index: 2;
      background: white;
      box-shadow: var(--shadow-card);
    }
    .stat-card {
      text-align: center;
      padding: 8px;
    }
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    .stat-line {
      width: 24px;
      height: 2px;
      background: var(--accent-gold);
      margin: 8px auto 0;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .service-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: rgba(11,29,58,0.06);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-deep);
      font-size: 24px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      margin-bottom: 8px;
    }
    .service-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
      flex: 1;
    }
    .text-link {
      color: var(--accent-gold);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .text-link i {
      transition: transform var(--transition);
    }
    .text-link:hover i {
      transform: translateX(4px);
    }

    /* 解决方案对比 */
    .compare-wrapper {
      display: flex;
      gap: 40px;
      align-items: flex-start;
      margin-top: 32px;
    }
    .compare-col {
      flex: 1;
      padding: 24px;
    }
    .compare-divider {
      width: 1px;
      background: var(--border-light);
      align-self: stretch;
    }
    .compare-list {
      list-style: none;
      margin-top: 20px;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
    }
    .left-list li {
      color: var(--text-muted);
    }
    .right-list li {
      color: var(--primary-deep);
      font-weight: 500;
    }
    .right-list .gold {
      color: var(--accent-gold);
      font-weight: 700;
    }

    /* Logo 墙 */
    .logo-wall {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      margin: 40px 0 24px;
    }
    .logo-item {
      width: 120px;
      height: 60px;
      background: #f0f2f5;
      border-radius: var(--radius-sm);
      filter: grayscale(100%);
      opacity: 0.7;
      transition: var(--transition);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      color: #999;
    }
    .logo-item:hover {
      filter: grayscale(0%);
      opacity: 1;
      transform: scale(1.03);
    }
    .case-summary {
      text-align: center;
      color: var(--text-muted);
      font-size: 15px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, background 0.3s;
      background: white;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      background: var(--bg-light);
      padding: 16px 24px;
    }
    .faq-item.active .faq-question {
      background: var(--bg-light);
    }

    /* CTA 区域 */
    .cta-section {
      background: var(--primary-deep);
      text-align: center;
      padding: 80px 0;
    }
    .cta-title {
      color: white;
    }
    .cta-desc {
      color: rgba(255,255,255,0.8);
      margin: 16px 0 32px;
    }
    .cta-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn-white-outline {
      border: 1.5px solid white;
      color: white;
      background: transparent;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
    }

    /* Footer */
    .site-footer {
      background: #0A1628;
      color: var(--silver);
      padding: 64px 0 32px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 20px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .footer-desc {
      font-size: 14px;
      line-height: 1.6;
      color: var(--silver);
    }
    .footer-links h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 10px;
      font-size: 14px;
      color: var(--silver);
    }
    .footer-links a:hover {
      color: white;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #6B7B8D;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .dashboard-grid { grid-template-columns: repeat(2, 1fr); }
      .compare-wrapper { flex-direction: column; }
      .compare-divider { display: none; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 30px; }
      h2 { font-size: 26px; }
      .nav-links, .header-actions .search-box { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero-grid { flex-direction: column; }
      .hero-image { text-align: center; margin-top: 32px; }
      .services-grid { grid-template-columns: 1fr; }
      .dashboard-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .logo-wall { justify-content: center; }
      .section { padding: 64px 0; }
    }