/* roulang page: index */
/* 自定义设计变量与全局重置 */
    :root {
      --bg-deep: #080F0C;
      --bg-card: #0F1A14;
      --primary-cyan: #00E5A0;
      --accent-orange: #FF6B35;
      --text-white: #FFFFFF;
      --text-muted: #B0C4B8;
      --glass-bg: rgba(15, 26, 20, 0.7);
      --glass-border: rgba(0, 229, 160, 0.15);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-light: 0 4px 20px rgba(0,0,0,0.08);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --transition: 0.3s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "Inter", "SF Pro Display", sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 自定义字体用于数字 */
    .font-number {
      font-family: var(--font-number);
    }
    
    /* 玻璃拟态卡片限定使用 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
    }
    
    /* 发光按钮系统 */
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      font-weight: 700;
      padding: 14px 40px;
      border-radius: 50px;
      border: none;
      cursor: pointer;
      box-shadow: 0 0 30px rgba(255, 107, 53, 0.5);
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
      font-size: 1rem;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(255, 107, 53, 0.8);
      transform: translateY(-2px);
    }
    
    .btn-secondary {
      background: transparent;
      color: var(--primary-cyan);
      border: 2px solid var(--primary-cyan);
      padding: 12px 38px;
      border-radius: 50px;
      font-weight: 600;
      cursor: pointer;
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-secondary:hover {
      background: var(--primary-cyan);
      color: #0A1C14;
      box-shadow: 0 0 20px rgba(0, 229, 160, 0.4);
    }
    
    /* 导航样式 */
    .header-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 999;
      height: 80px;
      background: transparent;
      transition: background var(--transition), box-shadow var(--transition);
      display: flex;
      align-items: center;
    }
    .header-nav.scrolled {
      background: rgba(8, 15, 12, 0.95);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    
    .logo-text {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, #00E5A0 0%, #00C48A 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    
    .nav-link {
      color: var(--text-muted);
      font-weight: 500;
      transition: color var(--transition);
      padding: 0.5rem 1rem;
      border-radius: 6px;
    }
    .nav-link:hover {
      color: var(--primary-cyan);
    }
    
    /* 汉堡菜单按钮 */
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-around;
      width: 28px;
      height: 22px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
    }
    .hamburger span {
      width: 100%;
      height: 3px;
      background: var(--primary-cyan);
      border-radius: 4px;
      transition: all 0.3s;
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(8, 15, 12, 0.98);
      backdrop-filter: blur(30px);
      z-index: 1000;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      font-size: 1.5rem;
      color: white;
      font-weight: 600;
    }
    
    /* 板块通用间距 */
    .section-py {
      padding-top: 100px;
      padding-bottom: 100px;
    }
    
    /* 卡片hover效果 */
    .hover-lift {
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .hover-lift:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 40px rgba(0,0,0,0.5);
    }
    
    /* 方案对比表推荐列发光 */
    .recommend-column {
      transform: scale(1.05);
      border: 1px solid var(--primary-cyan);
      box-shadow: 0 0 30px rgba(0, 229, 160, 0.25);
      position: relative;
      z-index: 2;
    }
    
    /* FAQ手风琴 */
    .faq-item {
      border-left: 3px solid transparent;
      transition: border-color 0.3s;
      background: rgba(15, 26, 20, 0.5);
      border-radius: 8px;
      margin-bottom: 12px;
    }
    .faq-item.active {
      border-left: 3px solid var(--primary-cyan);
      background: rgba(15, 26, 20, 0.8);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    
    /* 数字滚动动画 */
    .counter {
      font-family: var(--font-number);
      font-weight: 700;
      color: var(--primary-cyan);
    }
    
    /* 响应式调整 */
    @media (max-width: 1023px) {
      .header-nav {
        height: 70px;
      }
      .section-py {
        padding-top: 80px;
        padding-bottom: 80px;
      }
    }
    
    @media (max-width: 767px) {
      .header-nav {
        height: 60px;
      }
      .section-py {
        padding-top: 60px;
        padding-bottom: 60px;
      }
      .hamburger {
        display: flex;
      }
      .desktop-menu {
        display: none;
      }
      .recommend-column {
        transform: scale(1);
      }
      h1 {
        font-size: 36px !important;
      }
      h2 {
        font-size: 28px !important;
      }
      .grid-3-col {
        grid-template-columns: 1fr !important;
      }
      .grid-2-col {
        grid-template-columns: 1fr !important;
      }
      .hero-container {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        width: 100% !important;
      }
      .faq-grid {
        grid-template-columns: 1fr !important;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr !important;
      }
    }