/* roulang page: index */
:root {
      --primary: #0A66C2;
      --primary-dark: #084e96;
      --accent: #FF6B35;
      --accent-hover: #E55A2B;
      --bg: #F8F9FA;
      --surface: #FFFFFF;
      --text-primary: #1A202C;
      --text-secondary: #4A5568;
      --text-muted: #718096;
      --border: #E2E8F0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
      --transition: all 0.3s ease;
      --header-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      color: var(--text-primary);
      font-weight: 600;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 1px 0 var(--border);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      color: var(--text-primary);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-weight: 500;
      font-size: 15px;
      color: #2D3748;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      z-index: 1001;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      right: 0;
      width: 70%;
      max-width: 320px;
      height: 100vh;
      background: #1A202C;
      backdrop-filter: blur(20px);
      transform: translateX(100%);
      transition: transform 0.4s ease;
      display: flex;
      flex-direction: column;
      padding: 100px 32px 40px;
      gap: 24px;
      z-index: 999;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu .nav-link {
      color: white;
      font-size: 18px;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }
    .mobile-menu .nav-link:hover {
      color: var(--accent);
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(10,102,194,0.9) 0%, rgba(5,50,100,0.95) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      padding-top: var(--header-height);
      position: relative;
    }
    .hero .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: white;
      margin-bottom: 20px;
    }
    .hero p {
      font-size: 18px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 32px;
      max-width: 550px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(255,107,53,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }
    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 380px;
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .title-decor {
      width: 60px;
      height: 4px;
      background: var(--primary);
      margin: 0 auto 48px;
      border-radius: 2px;
    }
    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background: var(--surface);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .advantage-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-6px);
    }
    .advantage-icon {
      width: 64px;
      height: 64px;
      margin: 0 auto 20px;
      background: #EBF4FF;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .advantage-icon img {
      width: 36px;
      height: 36px;
    }
    .advantage-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }
    /* 解决方案 左右交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img {
      flex: 1 1 45%;
    }
    .solution-img img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-md);
      width: 100%;
    }
    .solution-text {
      flex: 1 1 45%;
    }
    .solution-text h3 {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    /* 数据证言 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--surface);
      padding: 32px 16px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: var(--accent);
      display: block;
      margin-bottom: 8px;
    }
    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
    }
    /* 客户证言 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--surface);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--accent);
      transition: var(--transition);
    }
    .testimonial-card:hover {
      box-shadow: var(--shadow-md);
    }
    .testimonial-text {
      font-style: italic;
      font-size: 17px;
      color: var(--text-secondary);
      margin-bottom: 20px;
      position: relative;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      background: #E2E8F0;
      border-radius: 50%;
      overflow: hidden;
    }
    .author-name {
      font-weight: 600;
      color: var(--text-primary);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
      border: none;
      width: 100%;
      text-align: left;
    }
    .faq-icon {
      font-size: 24px;
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F7FAFC;
      padding: 0 24px;
      color: #4A5568;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 20px 24px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }
    /* 终局CTA */
    .cta-dark {
      background: #1A202C;
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .cta-dark h2 {
      color: white;
      font-size: 36px;
    }
    .cta-dark p {
      color: #CBD5E0;
      margin: 16px 0 32px;
    }
    /* 页脚 */
    .footer {
      background: #1A202C;
      color: #CBD5E0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 20px;
      font-size: 18px;
    }
    .footer a {
      color: #CBD5E0;
      display: block;
      margin-bottom: 10px;
      transition: var(--transition);
    }
    .footer a:hover {
      color: white;
    }
    .copyright {
      border-top: 1px solid #2D3748;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }
    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .testimonials-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 32px; }
      .section { padding: 60px 0; }
      .section-title { font-size: 28px; }
      .advantages-grid, .stats-grid, .testimonials-grid { grid-template-columns: 1fr; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero .container { flex-direction: column; }
    }