/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary: #D4E20A;
      --primary-soft: rgba(212, 226, 10, 0.18);
      --dark: #1A1A1A;
      --warm-bg: #F5F5F0;
      --accent: #FF4D2E;
      --accent-hover: #e63e1f;
      --border-light: #E0E0D8;
      --text-secondary: #6B6B6B;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 28px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 20px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
      --transition-smooth: 0.25s ease;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--warm-bg);
      color: var(--dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      letter-spacing: -0.5px;
    }
    
    h1 {
      font-weight: 800;
      font-size: 48px;
      line-height: 1.2;
      color: var(--dark);
    }
    
    h2 {
      font-weight: 700;
      font-size: 36px;
      margin-bottom: 1.2rem;
    }
    
    h3 {
      font-weight: 700;
      font-size: 22px;
      margin-bottom: 0.5rem;
    }
    
    .section-padding {
      padding: 5rem 0;
    }
    
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    
    /* 按钮体系 */
    .btn-primary {
      background-color: var(--accent);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.75rem;
      display: inline-block;
      transition: background-color 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
      font-family: var(--font-heading);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: scale(1.03);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.75rem;
      display: inline-block;
      transition: background-color 0.2s, transform 0.2s;
      cursor: pointer;
      font-family: var(--font-heading);
    }
    .btn-outline:hover {
      background-color: rgba(255, 77, 46, 0.08);
      transform: scale(1.02);
    }
    
    /* 卡片通用 */
    .card-lift {
      background: white;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--card-shadow);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-lift:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(212, 226, 10, 0.5);
    }
    
    /* 标签 */
    .tag-chip {
      background: #F0F2E6;
      color: var(--dark);
      font-size: 12px;
      font-weight: 500;
      padding: 0.2rem 0.9rem;
      border-radius: var(--radius-tag);
      display: inline-block;
      font-family: var(--font-heading);
    }
    
    /* 导航毛玻璃 */
    .glass-nav {
      background: rgba(245, 245, 240, 0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(224, 224, 216, 0.7);
    }
    
    .nav-chip {
      background: #eaeae2;
      border-radius: 6px;
      padding: 0.4rem 1rem;
      font-weight: 500;
      color: var(--dark);
      transition: background 0.2s, color 0.2s;
      font-family: var(--font-heading);
    }
    .nav-chip:hover, .nav-chip.active {
      background: var(--primary-soft);
      color: #1a1a1a;
    }
    .nav-chip.active {
      border-bottom: 2px solid var(--primary);
      border-radius: 6px 6px 0 0;
    }
    
    /* 滚动渐现动画 */
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }
    
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-family: var(--font-heading);
      color: var(--dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: #4a4a4a;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding-bottom: 1.2rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    
    /* 移动端汉堡菜单 */
    .mobile-menu {
      display: none;
    }
    
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      h3 { font-size: 18px; }
      .container-custom { padding: 0 1.5rem; }
      .section-padding { padding: 3.5rem 0; }
      .desktop-nav { display: none; }
      .mobile-menu { display: block; }
      #mobileDrawer {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(245,245,240,0.98);
        backdrop-filter: blur(20px);
        z-index: 100;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        display: flex;
        flex-direction: column;
        padding: 2rem;
      }
      #mobileDrawer.open {
        transform: translateX(0);
      }
    }