/* roulang page: index */
:root {
      --color-ink: #1A1A1A;
      --color-champagne: #D4A574;
      --color-soft: #FAFAFA;
      --color-deep: #2C2C2C;
      --color-body: #4A4A4A;
      --color-muted: #8A8A8A;
      --color-border: #E5E5E5;
      --radius-card: 8px;
      --radius-btn: 6px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--color-soft);
      color: var(--color-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 2rem;
      padding-right: 2rem;
    }

    @media (max-width: 768px) {
      .container-main {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
      }
    }

    /* 导航自定义 */
    .nav-link {
      position: relative;
      font-size: 0.875rem;
      font-weight: 400;
      color: var(--color-body);
      transition: color 0.25s ease;
      text-decoration: none;
      white-space: nowrap;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -4px;
      width: 0;
      height: 2px;
      background-color: var(--color-champagne);
      transition: width 0.25s ease;
    }
    .nav-link:hover {
      color: var(--color-ink);
    }
    .nav-link:hover::after {
      width: 100%;
    }

    /* 按钮样式 */
    .btn-primary {
      background-color: var(--color-ink);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.3s ease, color 0.3s ease;
      text-decoration: none;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: var(--color-champagne);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--color-ink);
      color: var(--color-ink);
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.3s ease, color 0.3s ease;
      text-decoration: none;
    }
    .btn-outline:hover {
      background-color: var(--color-ink);
      color: white;
    }

    .text-link {
      color: var(--color-champagne);
      text-decoration: none;
      position: relative;
      font-weight: 500;
      display: inline-block;
      padding-bottom: 2px;
      background-image: linear-gradient(to right, var(--color-champagne), var(--color-champagne));
      background-size: 0% 1px;
      background-repeat: no-repeat;
      background-position: left bottom;
      transition: background-size 0.3s ease;
    }
    .text-link:hover {
      background-size: 100% 1px;
    }

    /* 滚动淡入动效 */
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 数字递增样式 */
    .count-number {
      font-variant-numeric: tabular-nums;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--color-border);
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.25rem 0;
      font-weight: 500;
      color: var(--color-ink);
      font-size: 1.125rem;
      transition: color 0.2s;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--color-champagne);
    }
    .faq-icon {
      font-size: 1.25rem;
      color: var(--color-champagne);
      transition: transform 0.35s ease;
      font-weight: 400;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      color: var(--color-body);
      font-weight: 300;
      font-size: 0.9375rem;
    }
    .faq-item.active .faq-answer {
      max-height: 160px;
      padding-bottom: 1.25rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 导航毛玻璃 */
    .glass-nav {
      background: rgba(250, 250, 250, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid #E5E5E5;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      box-shadow: 0 8px 20px rgba(0,0,0,0.05);
    }
    .mobile-menu.open {
      display: flex;
    }
    @media (min-width: 769px) {
      .mobile-menu {
        display: none !important;
      }
    }

    /* 图片样式 */
    .img-cover {
      object-fit: cover;
      width: 100%;
      height: 100%;
    }

    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #f1f1f1;
    }
    ::-webkit-scrollbar-thumb {
      background: #c1c1c1;
      border-radius: 3px;
    }