/* roulang page: index */
:root {
      --primary: #4E6EF2;
      --primary-hover: #3A5CE4;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --bg-light: #F5F6FA;
      --white: #FFFFFF;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --border-light: #E5E8EF;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
      --radius-lg: 12px;
      --radius-capsule: 24px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 150ms ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
      border: none;
      outline: none;
      background: transparent;
    }

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

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 100;
      height: 64px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 4px 0;
    }

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 1px;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        gap: 24px;
        padding: 32px 24px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
      }
      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .menu-toggle {
        display: flex;
      }
    }

    /* 板块通用间距 */
    section {
      padding: 80px 0;
    }

    /* Hero */
    .hero {
      background: linear-gradient(rgba(245, 246, 250, 0.85), rgba(245, 246, 250, 0.9)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      margin-top: 64px;
    }

    .hero-content {
      max-width: 800px;
    }

    .hero h1 {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    .hero .subtitle {
      font-size: 1rem;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto 2rem;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
      padding: 12px 28px;
      border-radius: var(--radius-lg);
      font-size: 16px;
      font-weight: 500;
      display: inline-block;
      transition: background var(--transition), transform var(--transition);
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }

    .scroll-indicator {
      margin-top: 2rem;
      opacity: 0.6;
      color: var(--text-secondary);
      font-size: 1.5rem;
    }

    /* 解决方案过渡区 */
    .solution-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .pain-point {
      flex: 1;
      color: var(--text-secondary);
      font-size: 1rem;
    }

    .divider {
      width: 1px;
      height: 60px;
      background: var(--border-light);
    }

    .solution-highlight {
      flex: 1;
      font-size: 1.25rem;
      font-weight: 500;
      color: var(--text-primary);
    }

    @media (max-width: 768px) {
      .solution-grid {
        flex-direction: column;
        gap: 24px;
      }
      .divider {
        width: 100%;
        height: 1px;
      }
    }

    /* 卡片网格 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

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

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

    .card-icon {
      width: 48px;
      height: 48px;
      background: rgba(78, 110, 242, 0.1);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
    }

    .card h3 {
      font-size: 1.25rem;
      font-weight: 500;
      margin-bottom: 12px;
    }

    .card p {
      font-size: 0.875rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    .card img {
      border-radius: 8px;
      margin-bottom: 16px;
      width: 100%;
      object-fit: cover;
    }

    /* 数据展示 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-number {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--text-primary);
    }

    .stat-label {
      font-size: 0.875rem;
      color: var(--text-secondary);
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      section {
        padding: 60px 0;
      }
    }

    /* 证言 */
    .testimonial-cards {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .testimonial {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .quote-icon {
      color: var(--border-light);
      font-size: 2rem;
      margin-bottom: 12px;
    }

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

    .client {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      background: var(--border-light);
      border-radius: 50%;
    }

    .client-name {
      font-weight: 500;
    }

    .client-role {
      font-size: 0.875rem;
      color: var(--text-secondary);
    }

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

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }

    .faq-item {
      background: var(--white);
      border-radius: var(--radius-lg);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 500;
    }

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.875rem;
      color: var(--text-secondary);
      display: none;
    }

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

    .faq-toggle {
      font-size: 1.5rem;
      color: var(--primary);
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      color: var(--white);
      text-align: center;
      border-radius: var(--radius-lg);
      padding: 60px 24px;
      margin: 0 24px;
    }

    .cta-section h2 {
      color: white;
    }

    .btn-white {
      background: var(--white);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-lg);
      font-weight: 500;
      display: inline-block;
      margin-top: 24px;
      transition: background var(--transition);
    }

    .btn-white:hover {
      background: #f0f2ff;
    }

    .contact-form {
      max-width: 500px;
      margin: 32px auto 0;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .input-capsule {
      background: white;
      border-radius: var(--radius-capsule);
      padding: 0 16px;
      height: 48px;
      border: 1px solid var(--border-light);
      font-size: 16px;
      width: 100%;
    }

    .input-capsule:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(78, 110, 242, 0.15);
    }

    /* 页脚 */
    .footer {
      background: #1F2329;
      color: var(--text-secondary);
      padding: 60px 0 30px;
    }

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

    .footer a {
      color: var(--text-secondary);
    }

    .footer a:hover {
      color: white;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.875rem;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero h1 {
        font-size: 1.8rem;
      }
    }