/* roulang page: index */
:root {
      --primary: #0B4D4A;
      --primary-dark: #083835;
      --accent: #C47E5A;
      --bg: #FAF9F7;
      --text-dark: #1A1A1A;
      --text-body: #4A4A4A;
      --text-light: #CCCCCC;
      --white: #FFFFFF;
      --border-light: #E0E0E0;
      --card-shadow: 0 4px 20px rgba(11, 77, 74, 0.08);
      --card-shadow-hover: 0 8px 30px rgba(11, 77, 74, 0.15);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-search: 24px;
      --transition-base: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      color: var(--text-dark);
      margin-top: 0;
    }
    h1 {
      font-size: 48px;
      line-height: 56px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 36px;
      line-height: 44px;
      font-weight: 700;
    }
    h3 {
      font-size: 22px;
      line-height: 30px;
      font-weight: 600;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .number-font {
      font-family: 'Inter', 'SF Mono', 'PingFang SC', monospace;
      font-weight: 600;
    }
    /* 导航栏 */
    .navbar {
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 50;
      padding: 12px 0;
    }
    .search-wrapper {
      position: relative;
      flex: 1;
      max-width: 400px;
    }
    .search-input {
      width: 100%;
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-search);
      padding: 12px 20px 12px 48px;
      font-size: 15px;
      outline: none;
      transition: var(--transition-base);
    }
    .search-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(11, 77, 74, 0.2);
    }
    .search-icon {
      position: absolute;
      left: 20px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--accent);
    }
    .nav-link {
      color: var(--text-dark);
      font-weight: 500;
      transition: var(--transition-base);
      text-decoration: none;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: var(--white);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-block;
      text-decoration: none;
      transition: var(--transition-base);
      border: none;
      cursor: pointer;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: #09403D;
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 30px;
      font-weight: 600;
      display: inline-block;
      text-decoration: none;
      transition: var(--transition-base);
      font-size: 16px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: var(--white);
    }
    .btn-light {
      background: var(--white);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-block;
      text-decoration: none;
      transition: var(--transition-base);
    }
    .btn-light:hover {
      background: var(--accent);
      color: var(--white);
    }
    /* 卡片 */
    .service-card, .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
      overflow: hidden;
    }
    .service-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    .case-card {
      border: 1px solid #E8E8E8;
      box-shadow: none;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }
    .case-card img {
      transition: transform 0.3s ease;
    }
    /* FAQ */
    .faq-item {
      border-radius: 8px;
      background: #F5F3F0;
      margin-bottom: 12px;
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: var(--white);
      border-radius: 0 0 8px 8px;
    }
    .faq-answer-content {
      padding: 0 20px 20px;
      color: var(--text-body);
      font-size: 15px;
    }
    .faq-item.active .faq-question {
      background: #E8F0EF;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    .footer-link {
      color: #CCCCCC;
      text-decoration: none;
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--white);
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
        line-height: 40px;
      }
      h2 {
        font-size: 26px;
        line-height: 34px;
      }
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
      .service-card:hover, .case-card:hover {
        transform: none;
      }
    }
    .decor-line {
      background: repeating-linear-gradient(90deg, var(--accent) 0px, var(--accent) 4px, transparent 4px, transparent 12px);
      height: 2px;
    }