/* roulang page: index */
:root {
      --color-primary: #2B3A2B;
      --color-primary-dark: #1F2A1F;
      --color-accent: #C49A2B;
      --color-accent-hover: #A88220;
      --color-bg: #FAF7F2;
      --color-card: #FFFFFF;
      --color-text: #1E1E1E;
      --color-text-soft: #5C5C5C;
      --color-border: #E5DFD5;
      --color-fade: #999999;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.03);
      --shadow-card-hover: 0 6px 20px rgba(0,0,0,0.06);
      --transition-base: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input {
      font-family: inherit;
    }

    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    @media (max-width: 768px) {
      .container-main {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

    /* 导航栏毛玻璃效果 */
    .glass-nav {
      background: rgba(250, 247, 242, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--color-border);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
    }

    .search-input {
      transition: width 0.25s ease, border-color 0.2s;
    }

    .search-input:focus {
      border-color: var(--color-accent);
      outline: none;
      width: 220px;
    }

    @media (max-width: 768px) {
      .search-input:focus {
        width: 180px;
      }
    }

    /* 卡片 hover */
    .service-card {
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .service-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-card-hover);
    }

    /* 按钮样式 */
    .btn-primary {
      background-color: var(--color-accent);
      color: #FFFFFF;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-block;
      transition: background-color 0.2s ease;
      border: none;
      cursor: pointer;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: var(--color-accent-hover);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--color-primary);
      color: var(--color-primary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-block;
      transition: background-color 0.2s ease, color 0.2s ease;
      text-align: center;
    }
    .btn-secondary:hover {
      background-color: var(--color-primary);
      color: #FFFFFF;
    }

    .btn-white-cta {
      background: #FFFFFF;
      color: var(--color-primary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 700;
      transition: background-color 0.2s, color 0.2s;
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-white-cta:hover {
      background-color: var(--color-accent);
      color: #FFFFFF;
    }

    /* 指标数字 */
    .metric-number {
      font-family: 'Inter', system-ui, sans-serif;
      font-weight: 700;
      font-size: 2.5rem;
      color: var(--color-accent);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--color-border);
      padding: 18px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--color-text);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
    }
    .faq-icon {
      font-size: 1.8rem;
      font-weight: 300;
      color: var(--color-accent);
      transition: transform 0.2s ease;
      line-height: 1;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--color-text-soft);
      padding-left: 24px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 12px;
      padding-bottom: 20px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* 对比区块左侧样式 */
    .compare-left {
      background-color: #f0f0f0;
      border-radius: 8px;
      padding: 16px 20px;
      color: #999;
      margin-bottom: 8px;
    }
    .compare-right {
      background-color: #e8efe8;
      border-radius: 8px;
      padding: 16px 20px;
      color: var(--color-primary);
      margin-bottom: 8px;
    }

    /* 背景纹理 */
    .hero-pattern {
      background-image: radial-gradient(circle at 20% 30%, rgba(43,58,43,0.02) 1px, transparent 1px);
      background-size: 30px 30px;
    }

    h1, h2, h3 {
      font-family: 'Noto Serif SC', serif;
    }
    .section-title {
      font-weight: 700;
      font-size: 2.5rem;
      color: var(--color-primary);
      margin-bottom: 48px;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.9rem;
      }
    }