/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --gold: #C89B5E;
      --gold-light: #E7D5B7;
      --dark-rock: #2E3238;
      --morning-blue: #E6EDF2;
      --warm-white: #FAF7F2;
      --amber-orange: #D4813A;
      --amber-deep: #B9682E;
      --olive-green: #7C8C5E;
      --gray-soft: #9BA1A6;
      --card-radius-lg: 16px;
      --card-radius: 12px;
      --btn-radius: 8px;
      --shadow-sm: 0 4px 20px rgba(46,50,56,0.06);
      --shadow-hover: 0 12px 32px rgba(46,50,56,0.12);
      --transition-base: 0.25s ease;
      --container-max: 1280px;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "Segoe UI", sans-serif;
      background-color: var(--warm-white);
      color: rgba(46,50,56,0.9);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base);
    }
    
    button, input, textarea {
      font-family: inherit;
    }
    
    .container-custom {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 导航相关 */
    .header-desktop {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(250,247,242,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--morning-blue);
      z-index: 40;
      display: flex;
      align-items: center;
    }
    
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--dark-rock);
      padding: 0.5rem 0.25rem;
      margin: 0 0.75rem;
      position: relative;
      white-space: nowrap;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background-color: var(--gold);
      transition: width var(--transition-base);
    }
    
    .nav-link:hover::after,
    .nav-link.active-nav::after {
      width: 100%;
    }
    
    .btn-primary {
      background: var(--amber-orange);
      color: white;
      border-radius: var(--btn-radius);
      padding: 0.6rem 1.5rem;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background var(--transition-base), transform var(--transition-base);
      display: inline-block;
      text-align: center;
    }
    
    .btn-primary:hover {
      background: var(--amber-deep);
      transform: scale(1.02);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--dark-rock);
      color: var(--dark-rock);
      border-radius: var(--btn-radius);
      padding: 0.6rem 1.5rem;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition-base);
    }
    
    .btn-outline:hover {
      border-color: var(--gold);
      color: var(--gold);
    }
    
    /* 卡片基础 */
    .card-elevated {
      background: #FFFFFF;
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition-base), box-shadow var(--transition-base);
    }
    
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    
    /* 底部tab (移动端) */
    .mobile-tab-bar {
      display: none;
    }
    
    @media (max-width: 767px) {
      .header-desktop .nav-links-group {
        display: none;
      }
      .mobile-tab-bar {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 64px;
        background: rgba(255,255,255,0.96);
        backdrop-filter: blur(16px);
        border-top: 1px solid var(--morning-blue);
        z-index: 45;
        justify-content: space-around;
        align-items: center;
        padding-bottom: env(safe-area-inset-bottom);
      }
      .tab-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        color: #8E959C;
        transition: color 0.2s;
      }
      .tab-item i {
        font-size: 1.4rem;
        margin-bottom: 2px;
      }
      .tab-item.active-tab {
        color: var(--gold);
      }
      body {
        padding-bottom: 80px;
      }
    }
    
    /* 手风琴动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background-color: #FFFFFF;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
      background-color: #F4F8FC;
    }
    .faq-item.open .faq-icon-plus {
      transform: rotate(45deg);
    }
    
    /* 英雄区域图片微调 */
    .hero-image {
      border-radius: 24px;
      box-shadow: 0 20px 35px rgba(46,50,56,0.1);
    }