/* roulang page: index */
:root {
      --c-brand-dark: #0A192F;
      --c-navy-main: #0F4C81;
      --c-navy-deep: #1A365D;
      --c-blue-accent: #2B6CB0;
      --c-blue-bright: #3182CE;
      --c-cyan-tech: #00A3C4;
      --c-bg-light: #F7FAFC;
      --c-bg-card: #FFFFFF;
      --c-text-primary: #1A202C;
      --c-text-muted: #4A5568;
      --c-border: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-subtle: 0 4px 6px -1px rgba(15, 76, 129, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
      --shadow-hover: 0 20px 25px -5px rgba(15, 76, 129, 0.12), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

    body {
      background-color: var(--c-bg-light);
      color: var(--c-text-primary);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

    /* 容器规范 */
    .site-container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 板块通用间距 */
    .biz-section {
      padding-top: 5.5rem;
      padding-bottom: 5.5rem;
      position: relative;
    }
    @media (max-width: 768px) {
      .biz-section {
        padding-top: 3.5rem;
        padding-bottom: 3.5rem;
      }
    }

    /* 精致卡片与微动效 */
    .card-craft {
      background-color: var(--c-bg-card);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-subtle);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card-craft:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: #CBD5E0;
    }

    /* 按钮组件 */
    .btn-brand-primary {
      background: linear-gradient(135deg, var(--c-navy-main) 0%, var(--c-blue-accent) 100%);
      color: #FFFFFF;
      padding: 0.85rem 1.85rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
      min-height: 44px;
    }
    .btn-brand-primary:hover {
      background: linear-gradient(135deg, var(--c-navy-deep) 0%, var(--c-blue-bright) 100%);
      transform: translateY(-1px);
      box-shadow: 0 8px 16px rgba(15, 76, 129, 0.2);
    }

    .btn-brand-outline {
      border: 1.5px solid var(--c-navy-main);
      color: var(--c-navy-main);
      padding: 0.8rem 1.75rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      transition: all 0.25s ease;
      min-height: 44px;
    }
    .btn-brand-outline:hover {
      background-color: rgba(15, 76, 129, 0.05);
      border-color: var(--c-blue-bright);
      color: var(--c-blue-bright);
    }

    /* 手风琴隐藏态控制 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-item.active .faq-answer {
      max-height: 240px;
    }
    .faq-item.active .faq-chevron {
      transform: rotate(180deg);
    }