/* roulang page: index */
/* 基础重置与设计变量 */
    :root {
      --void: #0A0E17;
      --void-light: #0D1117;
      --void-card: #141A24;
      --void-border: #1E2532;
      --neon-pink: #FF3CAC;
      --neon-cyan: #00F0FF;
      --text-primary: #EAECEF;
      --text-secondary: #8A8F98;
      --card-radius: 12px;
      --btn-radius: 8px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--void);
      color: var(--text-secondary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 容器 */
    .container-main {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    
    /* 分段呼吸感背景微调 */
    .alt-bg-light {
      background-color: var(--void-light);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 导航沉浸式风格 */
    .navbar-fixed {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 50;
      transition: background 0.3s ease, backdrop-filter 0.3s ease, border-bottom 0.3s ease;
      background: transparent;
    }
    
    .navbar-scrolled {
      background: rgba(10,14,23,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--void-border);
    }
    
    .nav-link {
      color: var(--text-primary);
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--neon-cyan);
    }
    .nav-active {
      position: relative;
      color: #fff;
    }
    .nav-active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--neon-pink);
      border-radius: 2px;
    }
    
    /* 渐变文字(霓虹品牌) */
    .gradient-text {
      background: linear-gradient(90deg, #00F0FF, #FF3CAC);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    
    /* 按钮系统 */
    .btn-primary {
      background-color: var(--neon-pink);
      color: #fff;
      border-radius: var(--btn-radius);
      padding: 0.75rem 2rem;
      font-weight: 600;
      display: inline-block;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: #ff5cc3;
      box-shadow: 0 0 20px rgba(255,60,172,0.5);
      transform: translateY(-2px);
    }
    
    .btn-outline {
      border: 1.5px solid var(--neon-cyan);
      color: var(--neon-cyan);
      background: transparent;
      border-radius: var(--btn-radius);
      padding: 0.75rem 2rem;
      font-weight: 600;
      display: inline-block;
      transition: all 0.25s ease;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
      border-color: #fff;
      color: #fff;
    }
    
    /* 卡片系统基础 */
    .card-custom {
      background-color: var(--void-card);
      border-radius: var(--card-radius);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: 0 8px 32px rgba(255,60,172,0.15);
      border-color: rgba(0,240,255,0.25);
    }
    
    /* 标签药丸 */
    .badge-tag {
      background: rgba(0,240,255,0.08);
      color: var(--neon-cyan);
      border-radius: 20px;
      padding: 0.2rem 0.85rem;
      font-size: 0.8rem;
      display: inline-block;
    }
    
    /* 对比表左右样式 */
    .compare-left {
      background-color: #141A24;
      color: #8A8F98;
    }
    .compare-right {
      background-color: rgba(255,60,172,0.05);
      color: #EAECEF;
    }
    
    /* FAQ动画 */
    .faq-answer {
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    
    /* 手机菜单全屏样式 */
    .mobile-menu {
      background: rgba(10,14,23,0.98);
      backdrop-filter: blur(12px);
    }
    
    @media (max-width: 768px) {
      .container-main {
        padding: 0 1.2rem;
      }
    }