/* roulang page: index */
:root {
      --color-primary: #0D6B5D;
      --color-accent: #C8963E;
      --color-bg: #FAF9F6;
      --color-dark: #1A1F2B;
      --color-text: #3D424D;
      --color-muted: #6B7280;
      --color-border: #E5E7EB;
      --color-white: #FFFFFF;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(250,249,246,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--color-border);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 50;
      transition: all 0.2s;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      padding: 0 20px;
      position: relative;
    }
    .logo-link {
      font-size: 22px;
      font-weight: 800;
      color: var(--color-primary);
      text-decoration: none;
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--color-text);
      text-decoration: none;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--color-primary);
    }
    .mobile-menu-btn {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      z-index: 55;
    }
    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--color-primary);
      border-radius: 2px;
      transition: 0.2s;
    }
    .mobile-panel {
      display: none;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--color-white);
      box-shadow: var(--shadow-md);
      flex-direction: column;
      padding: 20px;
      gap: 18px;
      border-bottom: 1px solid var(--color-border);
    }
    .mobile-panel a {
      font-size: 16px;
      font-weight: 500;
      color: var(--color-text);
      text-decoration: none;
    }
    /* 通用区块 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 28px;
      font-weight: 700;
      line-height: 1.4;
      color: #1A1F2B;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--color-muted);
      margin-bottom: 40px;
    }
    /* 按钮 */
    .btn-primary {
      background: var(--color-primary);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      text-decoration: none;
      display: inline-block;
      transition: background 0.2s;
      border: none;
      cursor: pointer;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: #095246;
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--color-primary);
      color: var(--color-primary);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      text-decoration: none;
      display: inline-block;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: #E8F5F2;
    }
    .btn-accent {
      background: var(--color-accent);
      color: white;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 16px 40px;
      font-size: 18px;
      text-decoration: none;
      display: inline-block;
      transition: background 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-accent:hover {
      background: #B5842E;
    }
    /* 卡片通用 */
    .card-solution {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      border-left: 6px solid var(--color-primary);
      display: flex;
      flex-direction: column;
    }
    .card-solution:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .pain-card {
      background: transparent;
      padding: 16px 0;
      border-bottom: 1px solid var(--color-border);
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }
    .pain-card:last-child {
      border-bottom: none;
    }
    .testimonial-card {
      background: white;
      padding: 24px;
      border-radius: 0;
      border-bottom: 1px solid var(--color-border);
      position: relative;
    }
    .quote-mark {
      font-size: 48px;
      color: var(--color-primary);
      opacity: 0.2;
      line-height: 1;
      position: absolute;
      left: 20px;
      top: 10px;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--color-border);
    }
    .faq-question {
      font-size: 18px;
      font-weight: 600;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: #1A1F2B;
    }
    .faq-answer {
      font-size: 15px;
      line-height: 1.8;
      color: var(--color-text);
      padding-bottom: 18px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--color-primary);
    }
    /* 数据指标 */
    .metric-number {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      color: var(--color-primary);
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .nav-links {
        gap: 20px;
      }
      .navbar {
        height: 64px;
      }
    }
    @media (max-width: 768px) {
      .navbar {
        height: 60px;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: flex;
      }
      .mobile-panel.show {
        display: flex;
      }
      .section {
        padding: 60px 0;
      }
      .section-title {
        font-size: 24px;
      }
      .metric-number {
        font-size: 36px;
      }
      .btn-accent {
        padding: 14px 30px;
        font-size: 16px;
      }
    }
    @media (max-width: 520px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-buttons {
        justify-content: center;
      }
    }