/* roulang page: index */
/* 设计变量与基础重置 */
    :root {
      --ant-red: #D44C2F;
      --ant-red-dark: #B33A22;
      --moss-green: #2B3A2B;
      --amber-gold: #F0A500;
      --ant-black: #1A1D1A;
      --sand-white: #F5F3EE;
      --white: #FFFFFF;
      --text-secondary: #555;
      --border-light: rgba(26,29,26,0.08);
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      color: var(--ant-black);
      background-color: var(--sand-white);
      line-height: 1.75;
      margin: 0;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, .font-heading {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      letter-spacing: -0.02em;
    }

    .number-font {
      font-family: 'DIN Alternate', 'Inter', sans-serif;
      font-weight: 700;
    }

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

    a {
      color: inherit;
      text-decoration: none;
    }

    /* 导航特定样式 */
    .nav-link {
      position: relative;
      font-weight: 500;
      transition: color 0.25s ease;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background-color: var(--ant-red);
      transition: transform 0.25s ease;
      transform-origin: center;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--ant-red);
    }
    .nav-link:hover::after, .nav-link.active::after {
      transform: translateX(-50%) scaleX(1);
    }

    /* 卡片系统 */
    .card-hover {
      transition: all 0.25s ease;
      border: 1px solid var(--border-light);
      border-radius: 12px;
      background: var(--white);
      box-shadow: 0 2px 12px rgba(26,29,26,0.06);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(212,76,47,0.12);
      border-color: var(--ant-red);
    }

    /* 按钮系统 */
    .btn-primary {
      background-color: var(--ant-red);
      color: white;
      font-weight: 600;
      border-radius: 8px;
      padding: 0.875rem 2rem;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: var(--ant-red-dark);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(212,76,47,0.3);
    }

    .btn-outline {
      background: transparent;
      color: var(--ant-red);
      font-weight: 600;
      border-radius: 8px;
      padding: 0.875rem 2rem;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: 2px solid var(--ant-red);
      cursor: pointer;
    }
    .btn-outline:hover {
      background-color: rgba(212,76,47,0.1);
      transform: translateY(-2px);
    }

    .text-link {
      color: var(--moss-green);
      font-weight: 500;
      border-bottom: 2px solid transparent;
      transition: border-color 0.25s ease;
      cursor: pointer;
    }
    .text-link:hover {
      border-bottom-color: var(--amber-gold);
    }

    /* 装饰蚂蚁剪影 */
    .ant-silhouette {
      position: absolute;
      opacity: 0.08;
      font-size: 3rem;
      color: white;
      user-select: none;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(26,29,26,0.1);
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      color: var(--ant-black);
      padding: 1.25rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-question i {
      transition: transform 0.3s ease;
      color: var(--ant-red);
      font-size: 1.2rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      color: #555;
      padding: 0 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 0 0 1.25rem 0;
    }
    .faq-item.open .faq-question i {
      transform: rotate(45deg);
    }

    /* 移动端菜单 */
    @media (max-width: 767px) {
      .mobile-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(245,243,238,0.98);
        backdrop-filter: blur(8px);
        flex-direction: column;
        padding: 1.5rem;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        z-index: 50;
      }
      .mobile-menu.open {
        display: flex;
      }
    }

    /* 背景固定效果 */
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-attachment: fixed;
      position: relative;
    }
    .hero-overlay {
      background: linear-gradient(135deg, rgba(212,76,47,0.85) 0%, rgba(43,58,43,0.85) 100%);
      position: absolute;
      inset: 0;
    }