/* roulang page: index */
/* 基础 Reset 与变量定义 */
    :root {
      --color-primary: #0A7E3E;
      --color-primary-dark: #065A2C;
      --color-accent: #F5A623;
      --color-bg: #F8FAF5;
      --color-white: #FFFFFF;
      --color-dark: #1A1F1A;
      --color-text: #1F2329;
      --color-text-muted: #86909C;
      --border-color: rgba(0,0,0,0.05);
      --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 35px rgba(0, 0, 0, 0.12);
      --radius-card: 16px;
      --radius-pill: 30px;
      --transition-damped: 250ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.6;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-damped);
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: var(--transition-damped);
      border: none;
      outline: none;
    }
    
    input, textarea {
      font-family: inherit;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 玻璃导航 */
    .glass-nav {
      background: rgba(255, 255, 255, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.5);
      transition: all var(--transition-damped);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
    }
    
    .nav-scrolled {
      background: rgba(255, 255, 255, 0.92);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    
    /* 主按钮 */
    .btn-primary {
      background-color: var(--color-primary);
      color: white;
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition-damped);
      border: none;
    }
    
    .btn-primary:hover {
      background-color: var(--color-primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(10, 126, 62, 0.25);
    }
    
    /* 次按钮 */
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--color-primary);
      color: var(--color-primary);
      border-radius: var(--radius-pill);
      padding: 11px 27px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition-damped);
    }
    
    .btn-outline:hover {
      background-color: var(--color-primary);
      color: white;
      transform: translateY(-2px);
    }
    
    /* 卡片基础样式 */
    .card {
      background: var(--color-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-soft);
      transition: all var(--transition-damped);
      overflow: hidden;
    }
    
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    /* 标签样式 */
    .tag {
      display: inline-block;
      background: rgba(245, 166, 35, 0.1);
      color: var(--color-accent);
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 4px;
      letter-spacing: 0.3px;
    }
    
    /* 数据数字样式 */
    .stat-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--color-primary);
      line-height: 1.2;
    }
    
    /* 背景图区块 */
    .bg-image-block {
      background-size: cover;
      background-position: center;
      position: relative;
      z-index: 1;
    }
    
    .bg-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(26,31,26,0.7) 0%, rgba(26,31,26,0.4) 100%);
      z-index: -1;
    }
    
    /* 瀑布流兼容降级 */
    .masonry-grid {
      column-count: 2;
      column-gap: 24px;
    }
    
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
    }
    
    @media (max-width: 768px) {
      .masonry-grid {
        column-count: 1;
      }
      .container {
        padding: 0 16px;
      }
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-color);
      padding: 20px 0;
      cursor: pointer;
      transition: all var(--transition-damped);
    }
    
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--color-text-muted);
      line-height: 1.7;
    }
    
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 12px;
    }
    
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--color-primary);
    }
    
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: white;
      border-top: 1px solid #eee;
      padding: 8px 16px;
      justify-content: space-around;
      z-index: 50;
      box-shadow: 0 -4px 15px rgba(0,0,0,0.04);
    }
    
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
    }
    
    /* 动画 */
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0px); }
    }
    
    .float-animation {
      animation: float 4s ease-in-out infinite;
    }