/* roulang page: index */
:root {
      --primary-orange: #FF6B35;
      --primary-orange-hover: #E55A2B;
      --secondary-blue: #4E6EF2;
      --secondary-blue-light: #EBF0FA;
      --bg-light: #F5F6FA;
      --bg-card: #FFFFFF;
      --bg-accent: #EBF0F5;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --text-white: #FFFFFF;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.02);
      --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.08), 0 4px 8px rgba(0, 0, 0, 0.04);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.05);
      --transition: all 0.25s ease;
      --max-width: 1200px;
      --header-height: 64px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 36px;
      color: var(--text-primary);
    }

    h2 {
      font-size: 28px;
      color: var(--text-primary);
      margin-bottom: 16px;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-primary);
    }

    p {
      font-size: 16px;
      line-height: 1.6;
      color: var(--text-secondary);
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: var(--header-height);
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      z-index: 1000;
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      display: flex;
      align-items: center;
    }

    .header.scrolled {
      box-shadow: var(--shadow-nav);
    }

    .nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      height: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 20px;
      font-weight: 700;
      color: var(--text-primary);
    }

    .logo i {
      font-size: 24px;
      color: var(--primary-orange);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
    }

    .nav-links a:hover {
      color: var(--primary-orange);
    }

    .nav-links a.active {
      color: var(--primary-orange);
    }

    .btn-primary {
      background: var(--primary-orange);
      color: var(--text-white);
      border-radius: var(--radius-md);
      padding: 10px 24px;
      font-size: 15px;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(255,107,53,0.25);
    }

    .btn-primary:hover {
      background: var(--primary-orange-hover);
      box-shadow: 0 4px 12px rgba(255,107,53,0.35);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      color: var(--secondary-blue);
      border: 1.5px solid var(--secondary-blue);
      border-radius: var(--radius-md);
      padding: 10px 24px;
      font-size: 15px;
    }

    .btn-secondary:hover {
      background: var(--secondary-blue-light);
    }

    .btn-outline-white {
      background: transparent;
      color: var(--text-white);
      border: 1.5px solid rgba(255,255,255,0.7);
      border-radius: var(--radius-md);
      padding: 12px 28px;
      font-size: 16px;
    }

    .btn-outline-white:hover {
      background: rgba(255,255,255,0.15);
      border-color: white;
    }

    .btn-white {
      background: white;
      color: var(--primary-orange);
      border-radius: var(--radius-md);
      padding: 12px 28px;
      font-size: 16px;
      font-weight: 700;
    }

    .btn-white:hover {
      background: #f0f0f0;
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 4px;
    }

    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--header-height);
      left: 0;
      right: 0;
      bottom: 0;
      background: white;
      z-index: 999;
      flex-direction: column;
      padding: 32px 24px;
      gap: 24px;
    }

    .mobile-menu.active {
      display: flex;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
    }

    /* 区块 */
    section {
      padding: 80px 0;
    }

    .hero {
      padding-top: calc(var(--header-height) + 40px);
      background: linear-gradient(135deg, #F5F6FA 0%, #EBF0F5 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      margin-bottom: 16px;
      font-size: 42px;
    }

    .hero-content p {
      font-size: 18px;
      margin-bottom: 32px;
    }

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

    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 32px;
    }

    .pain-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: var(--transition);
    }

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

    .pain-icon {
      font-size: 28px;
      color: var(--secondary-blue);
      flex-shrink: 0;
    }

    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }

    .solution-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      text-align: left;
    }

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

    .solution-icon {
      font-size: 32px;
      color: var(--secondary-blue);
      margin-bottom: 16px;
      transition: var(--transition);
    }

    .solution-card:hover .solution-icon {
      background: linear-gradient(135deg, var(--primary-orange), var(--secondary-blue));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 32px;
    }

    .stat-item {
      text-align: center;
      padding: 24px;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    .stat-number {
      font-size: 42px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary-orange), #FF8C5A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 8px;
    }

    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 32px;
    }

    .testimonial-card {
      background: var(--bg-card);
      border-radius: 24px;
      padding: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: var(--transition);
    }

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

    .avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      object-fit: cover;
      flex-shrink: 0;
    }

    .quote {
      font-style: italic;
      font-size: 16px;
      color: var(--text-primary);
      margin-bottom: 8px;
    }

    .faq-list {
      margin-top: 32px;
    }

    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      user-select: none;
      font-size: 16px;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-icon {
      transition: transform 0.2s;
      color: var(--secondary-blue);
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    .cta-section {
      background: linear-gradient(135deg, var(--primary-orange), #FF8C5A);
      color: white;
      text-align: center;
      border-radius: var(--radius-lg);
      padding: 64px 24px;
      margin: 40px 24px;
    }

    .cta-section h2 {
      color: white;
      margin-bottom: 12px;
    }

    .footer {
      background: #f0f2f5;
      padding: 40px 24px;
      text-align: center;
    }

    .social-icons {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin: 16px 0;
    }

    .social-icons a {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #e0e2e6;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
      transition: var(--transition);
    }

    .social-icons a:hover {
      background: var(--secondary-blue);
      color: white;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .solutions-grid,
      .testimonials-grid {
        grid-template-columns: 1fr 1fr;
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      h1 { font-size: 28px; }
      h2 { font-size: 22px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .container { padding: 0 16px; }
      .pain-grid,
      .solutions-grid,
      .testimonials-grid,
      .stats-grid {
        grid-template-columns: 1fr;
      }
      .cta-section {
        margin: 20px 16px;
        padding: 48px 16px;
      }
      .hero {
        min-height: auto;
        padding-top: calc(var(--header-height) + 20px);
      }
    }