/* roulang page: index */
:root {
      --primary: #E8380D;
      --primary-dark: #c42d0a;
      --secondary: #1A1C23;
      --bg: #FBF9F6;
      --surface: #FFFFFF;
      --accent: #00B27A;
      --text-main: #1A1C23;
      --text-muted: #5C5F66;
      --text-light: #9A9DA3;
      --border-light: rgba(26,28,35,0.08);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-sm: 0px 4px 16px rgba(26,28,35,0.06);
      --shadow-md: 0px 8px 24px rgba(26,28,35,0.12);
      --transition: 0.2s ease;
      --max-width: 1280px;
      --header-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Inter", "SF Pro Display", system-ui, sans-serif;
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all var(--transition);
    }
    /* 导航 SaaS 命令栏风格 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.3px;
      color: var(--secondary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-muted);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .search-box {
      display: flex;
      align-items: center;
      background: rgba(26,28,35,0.04);
      border-radius: 32px;
      padding: 6px 16px;
      gap: 8px;
      border: 1px solid transparent;
      transition: all var(--transition);
    }
    .search-box i {
      color: var(--text-light);
      font-size: 0.9rem;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.9rem;
      width: 120px;
      color: var(--text-main);
    }
    .search-box:focus-within {
      background: white;
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(232,56,13,0.1);
    }
    .icon-btn {
      background: transparent;
      border: none;
      color: var(--text-muted);
      font-size: 1.2rem;
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      transition: background var(--transition);
    }
    .icon-btn:hover {
      background: rgba(26,28,35,0.05);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 600;
      font-size: 0.9rem;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 18px rgba(232,56,13,0.3);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--secondary);
    }
    @media (max-width: 1024px) {
      .nav-links, .header-actions .search-box, .header-actions .icon-btn {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: white;
        border-bottom: 1px solid var(--border-light);
        padding: 20px 24px;
        flex-direction: column;
        gap: 18px;
        box-shadow: var(--shadow-md);
      }
      .mobile-menu.active {
        display: flex;
      }
      .mobile-menu a {
        font-weight: 500;
        color: var(--text-main);
      }
      .mobile-search {
        display: flex;
        align-items: center;
        background: rgba(26,28,35,0.04);
        border-radius: 30px;
        padding: 10px 18px;
        margin-top: 8px;
      }
      .mobile-search input {
        border: none;
        background: transparent;
        width: 100%;
        outline: none;
      }
    }
    /* Hero 双栏 */
    .hero {
      padding: 120px 0 80px;
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      position: relative;
    }
    .hero h1 {
      font-size: 40px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: rgba(232,56,13,0.05);
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      height: 360px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .data-badge-float {
      position: absolute;
      bottom: 24px;
      left: 24px;
      background: white;
      border-radius: var(--radius-md);
      padding: 16px 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .badge-num {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
      font-family: 'Inter', sans-serif;
    }
    @media (max-width: 768px) {
      .hero {
        flex-direction: column;
        padding: 100px 0 60px;
      }
      .hero h1 {
        font-size: 32px;
      }
      .hero-visual {
        height: 260px;
        width: 100%;
      }
    }
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 16px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 48px;
    }
    /* 核心优势网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background: var(--surface);
      padding: 28px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      text-align: center;
    }
    .advantage-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    .advantage-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .advantage-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }
    /* 服务方案瀑布流 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: #e9e5e0;
      min-height: 260px;
    }
    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .service-text {
      flex: 1;
    }
    .service-text h2 {
      font-size: 28px;
      margin-bottom: 16px;
    }
    .check-list {
      list-style: none;
      margin: 16px 0;
    }
    .check-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 10px;
      color: var(--text-muted);
    }
    .check-list i {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
    }
    /* 数据案例 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--surface);
      border-radius: var(--radius-lg);
      padding: 32px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      font-family: 'Inter', sans-serif;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .compare-card {
      background: var(--surface);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.pro {
      border: 2px solid var(--accent);
    }
    .compare-card h3 {
      font-size: 24px;
    }
    .tag {
      background: var(--accent);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-left: 8px;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
    }
    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-lg);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary), #b52e0a);
      border-radius: var(--radius-lg);
      padding: 60px 24px;
      text-align: center;
      color: white;
      margin: 40px 0;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      padding: 16px 40px;
      border-radius: var(--radius-md);
      font-weight: 700;
      border: none;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }