/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #1A5F4A;
      --primary-hover: #154D3C;
      --primary-active: #0F3D2E;
      --accent: #E8B830;
      --accent-hover: #D4A520;
      --bg-light: #F7F9FA;
      --bg-card: #FFFFFF;
      --bg-dark: #1A2E3F;
      --text-heading: # What follows is a continuation of the style block, providing deep dark tone for premium contrast. 0F1A24;
      --text-body: #3A4550;
      --text-muted: #6B7B8D;
      --text-inverse: #FFFFFF;
      --border-light: #E8EDF2;
      --border-input: #DDE3E8;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 30px rgba(26,95,74,0.12);
      --shadow-nav: 0 1px 8px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
      --font-data: 'DIN Alternate', 'PingFang SC', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.6;
      color: var(--text-body);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      color: var(--text-heading);
      margin: 0;
    }

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

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

    button, input, select, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航栏固定样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: var(--shadow-nav);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo-text {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      gap: 8px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-menu a {
      padding: 8px 16px;
      border-radius: 20px;
      color: var(--text-body);
      font-weight: 500;
      transition: background 0.2s, color 0.2s;
      font-size: 0.95rem;
    }
    .nav-menu a:hover {
      background: #F0F4F7;
      color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(26,95,74,0.2);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s;
    }
    .btn-outline:hover {
      background: rgba(26,95,74,0.06);
    }
    .btn-accent {
      background: var(--accent);
      color: #0F1A24;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: background 0.2s, transform 0.15s;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--text-heading);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 24px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      z-index: 999;
    }
    .mobile-menu a {
      padding: 16px 12px;
      border-bottom: 1px solid var(--border-light);
      font-weight: 500;
      display: block;
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
      .navbar {
        height: 64px;
      }
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
      }
    }
    /* 卡片通用 */
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: transform 0.25s, box-shadow 0.25s;
      padding: 32px;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    /* 数据看板卡片 */
    .stat-card {
      background: rgba(255,255,255,0.06);
      backdrop-filter: blur(4px);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-data);
      font-size: 2.5rem;
      color: var(--accent);
      font-weight: 700;
    }
    /* 动画相关 */
    [data-aos] {
      transition-timing-function: ease;
    }

.stats-grid { grid-template-columns: repeat(4,1fr); }
    .services-grid { grid-template-columns: repeat(3,1fr); }
    @media (max-width: 992px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .services-grid, .stats-grid { grid-template-columns: 1fr; }
      footer .container { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 520px) {
      footer .container { grid-template-columns: 1fr; }
    }
    .faq-answer { background:#F7F9FA; }