/* roulang page: index */
:root {
      --primary: #1B7BDE;
      --primary-light: #0EA5E9;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-dark: #1E293B;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --accent: #F59E0B;
      --success: #10B981;
      --border: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', '苹方', '雅黑', system-ui, -apple-system, sans-serif;
      --transition: all 0.2s ease;
      --section-gap: 100px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      font-size: 16px;
      line-height: 1.7;
      margin: 0;
      padding: 0;
    }

    h1, h2, h3, h4 {
      color: var(--text-dark);
      font-weight: 600;
      letter-spacing: -0.3px;
      margin-bottom: 0.75rem;
    }

    h1 {
      font-size: 2.5rem;
      font-weight: 700;
      line-height: 1.3;
    }

    h2 {
      font-size: 2rem;
      font-weight: 600;
    }

    h3 {
      font-size: 1.35rem;
      font-weight: 600;
    }

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

    a:hover {
      color: var(--primary-light);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .top-nav {
      background: #fff;
      border-bottom: 1px solid var(--border);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: 70px;
      display: flex;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }

    .logo i {
      color: var(--primary);
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      color: var(--text-body);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }

    .nav-links a:hover {
      color: var(--primary);
      border-bottom-color: var(--primary-light);
    }

    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border-bottom: none !important;
      transition: var(--transition);
      display: inline-block;
    }

    .nav-cta:hover {
      background: var(--primary-light);
      transform: scale(1.02);
      color: white !important;
    }

    /* 汉堡菜单 */
    .menu-icon {
      display: none;
      cursor: pointer;
      font-size: 1.8rem;
      color: var(--text-dark);
    }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 18px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border);
      }

      .nav-links.active {
        display: flex;
      }

      .menu-icon {
        display: block;
      }

      .nav-cta {
        width: 100%;
        text-align: center;
      }
    }

    /* 区块间距 */
    section {
      padding: var(--section-gap) 0;
    }

    @media (max-width: 640px) {
      section {
        padding: 70px 0;
      }
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.7rem;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(27,123,222,0.08) 0%, rgba(14,165,233,0.02) 100%);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 140px 0 100px;
      margin-top: 70px;
    }

    .hero-overlay {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(2px);
      border-radius: 24px;
      padding: 48px 32px;
    }

    .hero h1 {
      color: var(--text-dark);
    }

    .hero .subtitle {
      font-size: 1.2rem;
      color: var(--text-body);
      margin: 1rem 0 2rem;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

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

    .btn-primary:hover {
      background: var(--primary-light);
      box-shadow: 0 8px 14px rgba(27,123,222,0.25);
      transform: scale(1.03);
      color: white;
    }

    .btn-secondary {
      background: white;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
    }

    .btn-secondary:hover {
      background: #EFF6FF;
      border-color: var(--primary-light);
    }

    .stats-bar {
      display: flex;
      justify-content: space-around;
      margin-top: 40px;
      background: white;
      border-radius: 16px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent);
    }

    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 28px;
      transition: var(--transition);
      height: 100%;
    }

    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    /* 功能图标 */
    .feature-icon {
      font-size: 2.4rem;
      color: var(--primary-light);
      margin-bottom: 18px;
    }

    /* 场景卡片 */
    .scenario-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-radius: 12px 12px 0 0;
    }

    /* 案例 */
    .case-logo {
      width: 60px;
      height: 60px;
      background: #E2E8F0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .growth {
      color: var(--success);
      font-weight: 700;
      font-size: 1.8rem;
    }

    /* 价格 */
    .pricing-card {
      border: 1px solid var(--border);
      text-align: center;
      position: relative;
    }

    .pricing-highlight {
      border: 2px solid var(--primary-light);
      box-shadow: 0 0 0 3px rgba(14,165,233,0.15);
    }

    .badge {
      background: var(--accent);
      color: #1E293B;
      font-weight: 700;
      padding: 6px 18px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }

    .price {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
    }

    .btn-accent {
      background: var(--accent);
      color: #1E293B;
      padding: 14px 24px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      display: inline-block;
    }

    .btn-accent:hover {
      background: #FBBF24;
    }

    /* FAQ */
    .accordion-title {
      background: white;
      border-left: 3px solid var(--primary);
      padding: 14px 20px;
      font-weight: 600;
      color: var(--text-dark);
      transition: 0.2s;
    }

    .accordion-title:hover {
      background: #F1F5F9;
    }

    .accordion-content {
      background: #F8FAFC;
      padding: 16px 20px;
    }

    /* 联系表单 */
    .contact-bg {
      background: linear-gradient(180deg, rgba(27,123,222,0.05) 0%, white 100%);
    }

    input, textarea {
      border-radius: var(--radius-input) !important;
      border: 1px solid var(--border) !important;
      padding: 12px 16px !important;
    }

    input:focus, textarea:focus {
      border-color: var(--primary) !important;
      box-shadow: 0 0 0 3px rgba(27,123,222,0.2) !important;
    }

    /* 页脚 */
    .footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 48px 0 24px;
    }

    .footer a {
      color: #94A3B8;
    }

    .footer a:hover {
      color: white;
    }

    .footer-bottom {
      border-top: 1px solid #334155;
      padding-top: 24px;
      font-size: 0.9rem;
    }