/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #0A2E5C;
      --primary-hover: #072040;
      --accent: #00B4A6;
      --accent-hover: #00988c;
      --bg: #F5F9FC;
      --white: #FFFFFF;
      --text: #1E293B;
      --text-secondary: #64748B;
      --text-light: #FFFFFF;
      --border-light: #E2E8F0;
      --warning: #F59E0B;
      --danger: #EF4444;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-card: 0 4px 20px rgba(10,46,92,0.06);
      --shadow-card-hover: 0 12px 32px rgba(10,46,92,0.12);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.04);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "Roboto", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 标题装饰线 */
    .section-title {
      font-size: 32px;
      font-weight: 600;
      letter-spacing: -0.3px;
      color: var(--primary);
      margin-bottom: 16px;
      position: relative;
      padding-left: 24px;
    }
    .section-title::before {
      content: '';
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      width: 4px;
      height: 40px;
      background-color: var(--accent);
      border-radius: 2px;
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* 导航系统 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
      background: transparent;
      backdrop-filter: blur(0px);
    }
    .navbar.scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      padding: 12px 0;
    }
    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 700;
      color: var(--white);
      transition: color var(--transition);
    }
    .navbar.scrolled .logo {
      color: var(--primary);
    }
    .logo i {
      font-size: 28px;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: rgba(255,255,255,0.9);
      transition: color var(--transition);
      font-size: 15px;
    }
    .navbar.scrolled .nav-links a {
      color: var(--text);
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .btn-capsule {
      background: var(--accent);
      color: var(--white);
      padding: 10px 24px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      border: none;
      cursor: pointer;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
    }
    .btn-capsule:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 24px;
      cursor: pointer;
      transition: color var(--transition);
    }
    .navbar.scrolled .hamburger {
      color: var(--primary);
    }
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10,46,92,0.98);
      backdrop-filter: blur(20px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      transform: translateY(-100%);
      transition: transform 0.4s ease;
      z-index: 999;
    }
    .mobile-menu.active {
      transform: translateY(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 500;
      display: block;
    }
    .mobile-menu .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 28px;
      background: none;
      border: none;
      color: white;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: var(--white);
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 15px;
      border: none;
      cursor: pointer;
      display: inline-block;
      transition: background var(--transition), transform var(--transition);
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      border-radius: var(--radius-sm);
      padding: 12px 32px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 32px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: background var(--transition);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
    }

    /* Hero 区域 */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(90deg, rgba(10,46,92,0.82) 0%, rgba(10,46,92,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      gap: 40px;
    }
    .hero-text {
      flex: 1;
      animation: fadeInUp 0.8s ease;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: white;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text p {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-float {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-md);
      padding: 28px;
      color: white;
      min-width: 260px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.2);
      animation: fadeInUp 1s ease;
    }
    .float-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 16px;
    }
    .float-number {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 28px;
      color: var(--accent);
    }

    /* 数据看板 */
    .metrics {
      padding: 80px 0;
      background: var(--white);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-card {
      background: var(--bg);
      border-radius: var(--radius-md);
      padding: 32px 16px;
    }
    .metric-number {
      font-family: 'Inter', sans-serif;
      font-weight: 700;
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .metric-label {
      color: var(--text-secondary);
      font-size: 15px;
    }

    /* 服务卡片 */
    .services {
      padding: 80px 0;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-secondary);
      margin-bottom: 20px;
      flex: 1;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 对比区域 */
    .compare {
      padding: 80px 0;
      background: var(--white);
    }
    .compare-wrapper {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 30px;
      position: relative;
    }
    .compare-card {
      flex: 1;
      padding: 40px;
      border-radius: var(--radius-lg);
      background: #F1F5F9;
      color: #64748B;
    }
    .compare-card.highlight {
      background: white;
      border: 2px solid var(--primary);
      color: var(--text);
    }
    .vs-badge {
      background: var(--warning);
      color: white;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      z-index: 2;
      flex-shrink: 0;
    }

    /* FAQ */
    .faq {
      padding: 80px 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单 */
    .contact {
      padding: 80px 0;
      background: #E8F4F8;
    }
    .form-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 48px;
      max-width: 600px;
      margin: 0 auto;
      box-shadow: var(--shadow-card);
    }
    .form-group input {
      width: 100%;
      padding: 14px;
      border: 2px solid transparent;
      background: #F8FAFC;
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      outline: none;
    }
    .form-group input:focus {
      border-color: var(--accent);
      background: white;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: #CBD5E1;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .copyright {
      background: #061F3E;
      text-align: center;
      padding: 16px;
      margin-top: 40px;
      font-size: 14px;
    }

    @keyframes fadeInUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    @media (max-width: 1024px) {
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-content { flex-direction: column; text-align: center; }
      .hero-text h1 { font-size: 32px; }
      .compare-wrapper { flex-direction: column; }
      .vs-badge { margin: 10px 0; }
      .services-grid, .metrics-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }