/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --primary-deep: #0A1929;
      --accent-orange: #FF6B35;
      --bg-light: #F8FAFC;
      --card-white: #FFFFFF;
      --text-title: #1E293B;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --highlight-cyan: #38BDF8;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.2s ease;
      --footer-bg: #1E293B;
      --footer-text: #CBD5E1;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 板块间距 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 640px) {
      section {
        padding: 48px 0;
      }
    }

    /* 导航栏 - 桌面固定顶部 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 25, 41, 0.95);
      backdrop-filter: blur(12px);
      z-index: 100;
      box-shadow: 0 2px 10px rgba(0,0,0,0.3);
      transition: var(--transition);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
    }

    .logo-icon {
      font-size: 28px;
      color: var(--accent-orange);
    }

    .desktop-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .desktop-nav a {
      color: #CBD5E1;
      font-weight: 500;
      font-size: 15px;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }

    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: white;
      border-bottom-color: var(--accent-orange);
    }

    .nav-cta {
      background: var(--accent-orange);
      color: white !important;
      padding: 10px 22px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border-bottom: none !important;
      transition: var(--transition);
    }

    .nav-cta:hover {
      background: #E55A2B;
      color: white !important;
    }

    /* 移动端汉堡菜单 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
    }

    /* 移动端底部Tab导航 */
    .mobile-tab-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: white;
      box-shadow: 0 -2px 8px rgba(0,0,0,0.06);
      z-index: 200;
      justify-content: space-around;
      align-items: center;
      border-top: 1px solid var(--border-light);
    }

    @media (max-width: 640px) {
      .mobile-tab-bar {
        display: flex;
      }
      body {
        padding-bottom: 70px;
      }
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: #64748B;
      font-size: 12px;
      gap: 4px;
      background: none;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      font-weight: 500;
    }

    .tab-item svg {
      width: 22px;
      height: 22px;
      stroke: currentColor;
      fill: none;
    }

    .tab-item.active {
      color: var(--accent-orange);
    }

    /* Hero区域 */
    #hero {
      background: linear-gradient(135deg, #0A1929 0%, #1E3A5F 100%);
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 90px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 400px;
      color: white;
    }

    .hero-text h1 {
      font-size: 42px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
    }

    .hero-text p {
      font-size: 18px;
      color: #CBD5E1;
      margin-bottom: 32px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: var(--transition);
      border: none;
    }

    .btn-primary:hover {
      background: #E55A2B;
    }

    .btn-secondary {
      border: 1px solid #CBD5E1;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      transition: var(--transition);
    }

    .btn-secondary:hover {
      border-color: var(--accent-orange);
      color: var(--accent-orange);
    }

    .hero-image {
      flex: 1 1 400px;
      position: relative;
      background: rgba(255,255,255,0.05);
      border-radius: 24px;
      overflow: hidden;
    }

    .hero-image img {
      width: 100%;
      border-radius: 20px;
      opacity: 0.9;
    }

    /* 装饰网格 */
    .hero-bg-pattern {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle at 20% 30%, rgba(56,189,248,0.08) 0%, transparent 30%);
      pointer-events: none;
    }

    /* 核心优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
      margin-top: 40px;
    }

    .advantage-card {
      background: var(--card-white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .advantage-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }

    .advantage-icon {
      font-size: 36px;
      color: var(--accent-orange);
      margin-bottom: 16px;
    }

    /* 产品矩阵 - 非对称网格 */
    .products-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
      margin-top: 40px;
    }

    @media (max-width: 768px) {
      .products-grid {
        grid-template-columns: 1fr;
      }
    }

    .product-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .product-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }

    .product-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      background: #E2E8F0;
    }

    .product-content {
      padding: 24px;
    }

    .tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin: 12px 0;
    }

    .tag {
      background: #E0F2FE;
      color: #0284C7;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }

    .link-arrow {
      color: var(--accent-orange);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 场景左右交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 60px;
      flex-wrap: wrap;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .scenario-img {
      flex: 1 1 300px;
      border-radius: 24px;
      overflow: hidden;
      background: #E2E8F0;
    }

    .scenario-img img {
      width: 100%;
    }

    .scenario-text {
      flex: 1 1 300px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
      margin-top: 30px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .case-logo {
      width: 80px;
      height: 80px;
      background: #E2E8F0;
      border-radius: 50%;
      flex-shrink: 0;
    }

    .case-data {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-orange);
    }

    /* FAQ手风琴 */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 8px;
    }

    .accordion-title {
      background: #F1F5F9;
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
      border-radius: 8px;
    }

    .accordion-title:hover {
      color: var(--accent-orange);
    }

    .accordion-content {
      padding: 0 24px 16px;
      display: none;
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    /* CTA横幅 */
    .cta-band {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      padding: 80px 20px;
      border-radius: 24px;
      margin: 40px 0;
    }

    .cta-band h2 {
      font-size: 32px;
      margin-bottom: 12px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    .social-icons svg {
      width: 24px;
      height: 24px;
      fill: #CBD5E1;
      margin-right: 12px;
      transition: var(--transition);
    }

    .social-icons svg:hover {
      fill: var(--accent-orange);
    }

    .copyright {
      background: #0F172A;
      text-align: center;
      padding: 16px;
      margin-top: 40px;
      font-size: 14px;
    }