/* roulang page: index */
:root {
      --primary: #0A6E7A;
      --primary-dark: #085862;
      --accent: #FF6B4A;
      --accent-hover: #E55A3A;
      --bg-light: #F8F9FA;
      --bg-alt: #EFF6F7;
      --card-white: #FFFFFF;
      --text-heading: #0A1F2B;
      --text-body: #4A5B66;
      --text-muted: #7A8B99;
      --border-light: #E2E8F0;
      --footer-bg: #0A1F2B;
      --footer-text: #A0B4C0;
      --shadow-sm: 0 4px 12px rgba(10, 30, 43, 0.04);
      --shadow-md: 0 12px 24px rgba(10, 30, 43, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 40px;
      --transition: all 0.25s ease;
      --max-width: 1200px;
      --nav-height: 76px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      padding-top: var(--nav-height);
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      color: var(--text-heading);
      font-weight: 600;
      line-height: 1.3;
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 2rem;
      margin-bottom: 16px;
      font-weight: 600;
    }
    h3 {
      font-size: 1.4rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 12px;
    }
    p {
      color: var(--text-body);
      line-height: 1.7;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-card);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      transition: var(--transition);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-size: 1rem;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--accent);
      color: white;
      box-shadow: 0 4px 10px rgba(255, 107, 74, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(229, 90, 58, 0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      background-color: white;
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-light {
      background: white;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .btn-light:hover {
      background: var(--bg-alt);
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 100;
      height: var(--nav-height);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      font-weight: 500;
      color: var(--text-heading);
    }
    .nav-menu a {
      font-size: 1rem;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-menu a:hover {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--primary);
    }
    /* 板块通用 */
    section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      margin-bottom: 16px;
    }
    .section-title p {
      color: var(--text-muted);
      max-width: 650px;
      margin: 0 auto;
      font-size: 1.1rem;
    }
    /* Hero */
    .hero {
      background: linear-gradient(90deg, rgba(248,249,250,0.95) 0%, rgba(248,249,250,0.7) 70%), url('/assets/images/backpic/back-1.webp') center right/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-text h1 {
      margin-bottom: 24px;
    }
    .hero-text p {
      font-size: 1.25rem;
      color: var(--text-body);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      display: flex;
      justify-content: center;
    }
    .hero-visual img {
      max-height: 400px;
      object-fit: contain;
      filter: drop-shadow(0 20px 30px rgba(10,30,43,0.15));
    }
    /* 卡片网格 */
    .grid-3, .grid-4 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
      border: 1px solid rgba(226,232,240,0.6);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(10,110,122,0.15);
    }
    .card-icon {
      width: 70px;
      height: 70px;
      background: rgba(10,110,122,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 24px;
      font-size: 2rem;
      color: var(--primary);
    }
    .card h3 {
      margin-bottom: 12px;
    }
    /* 图文交替 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-img, .feature-content {
      flex: 1;
    }
    .feature-content ul {
      list-style: none;
      margin-top: 20px;
    }
    .feature-content li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 500;
    }
    .feature-content i {
      color: var(--accent);
      font-size: 1.2rem;
    }
    /* 案例/数据 */
    .case-wall {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      justify-content: center;
      margin-top: 30px;
    }
    .case-item {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      flex: 1 1 280px;
      max-width: 350px;
      transition: var(--transition);
    }
    .case-item:hover {
      transform: translateY(-4px);
    }
    .case-item img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .case-text {
      padding: 20px;
    }
    .stat-highlight {
      display: flex;
      justify-content: space-around;
      background: var(--primary);
      border-radius: var(--radius-card);
      padding: 40px 20px;
      margin: 40px 0;
      color: white;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-item h3 {
      color: white;
      font-size: 2.4rem;
      margin-bottom: 4px;
    }
    /* 价格卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      align-items: start;
    }
    .price-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      text-align: center;
      transition: var(--transition);
      position: relative;
    }
    .price-card.featured {
      border: 2px solid var(--primary);
      transform: scale(1.03);
      box-shadow: var(--shadow-md);
    }
    .badge {
      background: var(--accent);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }
    .price {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-heading);
      margin: 20px 0;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-heading);
    }
    .faq-answer {
      padding: 0 28px 20px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 联系表单 */
    .contact-form {
      max-width: 600px;
      margin: 40px auto 0;
      background: white;
      padding: 40px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-md);
    }
    .form-group input, .form-group textarea {
      width: 100%;
      padding: 14px 16px;
      border: none;
      border-bottom: 2px solid var(--border-light);
      background: transparent;
      font-size: 1rem;
      margin-bottom: 24px;
      outline: none;
      transition: var(--transition);
    }
    .form-group input:focus, .form-group textarea:focus {
      border-bottom-color: var(--primary);
    }
    /* Footer */
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer a {
      color: var(--footer-text);
      font-size: 0.9rem;
    }
    .footer a:hover {
      color: white;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 2.2rem; }
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-visual { display: none; }
      .grid-3, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      :root { --nav-height: 70px; }
      .nav-menu { display: none; position: absolute; top: 70px; left: 0; width: 100%; background: white; flex-direction: column; padding: 20px; box-shadow: var(--shadow-md); }
      .nav-menu.active { display: flex; }
      .hamburger { display: block; }
      .grid-3, .grid-4, .pricing-grid { grid-template-columns: 1fr; }
      .feature-row { flex-direction: column; gap: 30px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 60px 0; }
    }