/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --primary: #0F4C81;
      --primary-dark: #0A3A62;
      --accent: #F28C28;
      --accent-hover: #e07b1a;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-secondary: #5A6A7A;
      --border-light: #E2E8F0;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 8px 30px rgba(15, 76, 129, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --transition: 0.2s ease;
      --container-max: 1200px;
      --header-height: 72px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    ul {
      list-style: none;
    }
    
    input, button {
      font-family: inherit;
      font-size: inherit;
      outline: none;
    }
    
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 辅助样式 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      letter-spacing: 0.3px;
    }
    
    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
      box-shadow: 0 2px 8px rgba(15, 76, 129, 0.2);
    }
    
    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      box-shadow: 0 4px 12px rgba(15, 76, 129, 0.3);
      transform: translateY(-1px);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    
    .btn-outline:hover {
      background: rgba(15, 76, 129, 0.05);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
    }
    
    .btn-accent {
      background: var(--accent);
      color: white;
      border-color: var(--accent);
      box-shadow: 0 4px 10px rgba(242, 140, 40, 0.25);
    }
    
    .btn-accent:hover {
      background: var(--accent-hover);
      border-color: var(--accent-hover);
      box-shadow: 0 6px 14px rgba(242, 140, 40, 0.35);
    }
    
    /* 导航栏 */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
      height: var(--header-height);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    
    .logo i {
      font-size: 2rem;
      color: var(--accent);
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: border-color var(--transition), color var(--transition);
    }
    
    .nav-links a:hover, .nav-links a:active {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }
    
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-dark);
      cursor: pointer;
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: 0;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: white;
      box-shadow: -8px 0 25px rgba(0,0,0,0.1);
      transform: translateX(100%);
      transition: transform 0.25s ease;
      z-index: 1100;
      display: flex;
      flex-direction: column;
      padding: 24px;
    }
    
    .mobile-menu.active {
      transform: translateX(0);
    }
    
    .mobile-menu-links {
      display: flex;
      flex-direction: column;
      gap: 24px;
      margin-top: 60px;
      font-size: 1.2rem;
      font-weight: 500;
    }
    
    .mobile-menu-close {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      font-size: 2rem;
      cursor: pointer;
      color: var(--text-dark);
    }
    
    .overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.3);
      z-index: 1050;
      display: none;
    }
    
    .overlay.active {
      display: block;
    }
    
    /* Hero 首屏 */
    .hero {
      background: linear-gradient(135deg, #F7F9FC 0%, #EDF2F7 100%);
      padding: 60px 0 70px;
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    
    .hero-content h1 {
      font-size: 44px;
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.25;
      margin-bottom: 18px;
    }
    
    .hero-content .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 30px;
    }
    
    .trust-signals {
      display: flex;
      gap: 20px;
      color: var(--text-secondary);
      font-size: 0.9rem;
      align-items: center;
    }
    
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 20px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      position: relative;
    }
    
    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }
    
    .section-title p {
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }
    
    /* 痛点区 */
    .pain-points {
      background: var(--white);
    }
    
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .pain-card {
      background: #F4F7FC;
      padding: 28px;
      border-radius: 12px;
      font-weight: 500;
      color: var(--text-dark);
      border-left: 5px solid var(--accent);
    }
    
    /* 解决方案卡片 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 32px 24px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    .card-icon {
      width: 64px;
      height: 64px;
      background: rgba(15, 76, 129, 0.08);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 2rem;
      color: var(--primary);
    }
    
    .card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    
    .card p {
      color: var(--text-secondary);
      margin-bottom: 18px;
      flex: 1;
    }
    
    /* 成果展示 */
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    
    .stat-item {
      background: var(--white);
      padding: 32px 16px;
      border-radius: 12px;
      box-shadow: var(--shadow-card);
    }
    
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary);
    }
    
    /* 客户证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    
    .testimonial-card {
      background: white;
      padding: 28px;
      border-radius: 12px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 16px;
      align-items: center;
    }
    
    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: #ccc;
      flex-shrink: 0;
      background-size: cover;
    }
    
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, margin 0.2s;
      color: var(--text-secondary);
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 15px;
    }
    
    /* CTA */
    .cta-block {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 70px 0;
    }
    
    /* 页脚 */
    footer {
      background: #0A2A44;
      color: rgba(255,255,255,0.9);
      padding: 60px 0 20px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    
    @media (max-width: 1024px) {
      .hero-grid, .solution-grid, .pain-grid {
        grid-template-columns: 1fr 1fr;
      }
      .results-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .hero-grid, .pain-grid, .solution-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 { font-size: 2rem; }
      section { padding: 50px 0; }
    }