/* roulang page: index */
/* :root 设计变量 —— 深紫电竞系统 */
    :root {
      --primary: #2D1B4E;
      --primary-dark: #1E1038;
      --accent-purple: #9B59B6;
      --flow-gold: #F3C623;
      --neon-green: #00E676;
      --neon-green-hover: #00c853;
      
      --bg-dark: #0D0A1A;
      --bg-card: rgba(255, 255, 255, 0.03);
      --border-light: rgba(255, 255, 255, 0.08);
      --border-hover: rgba(155, 89, 182, 0.4);
      
      --text-primary: #FFFFFF;
      --text-secondary: #E0D7F5;
      --text-muted: #A9A0C0;
      
      --radius-lg: 16px;
      --radius-md: 8px;
      --radius-sm: 4px;
      
      --shadow-glow: 0 0 18px rgba(0, 230, 118, 0.25);
      --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      
      --font-title: 'Montserrat', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
    }
    
    /* Reset & Base */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      background-color: var(--bg-dark);
    }
    
    body {
      font-family: var(--font-body);
      background: radial-gradient(circle at 20% 10%, #2D1B4E 0%, #0D0A1A 70%);
      background-attachment: fixed;
      color: var(--text-secondary);
      line-height: 1.7;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 容器与通用布局 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
      width: 100%;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a, button {
      transition: var(--transition-smooth);
    }
    
    /* 字体与颜色工具 */
    h1, h2, h3, .title-font {
      font-family: var(--font-title);
      font-weight: 700;
      color: var(--text-primary);
    }
    
    h2 {
      font-size: 2.5rem;
      letter-spacing: -0.5px;
      margin-bottom: 0.75rem;
    }
    
    .text-neon {
      color: var(--neon-green);
    }
    
    .text-gold {
      color: var(--flow-gold);
    }
    
    .text-accent {
      color: var(--accent-purple);
    }
    
    /* 按钮组件完整样式 */
    .btn-primary {
      background: var(--neon-green);
      color: var(--primary-dark);
      font-weight: 700;
      padding: 0.85rem 2.2rem;
      border-radius: var(--radius-md);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      letter-spacing: 0.3px;
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 12px rgba(0, 230, 118, 0.2);
      font-family: var(--font-body);
      white-space: nowrap;
    }
    
    .btn-primary:hover {
      background: #00e072;
      box-shadow: var(--shadow-glow), 0 8px 22px rgba(0, 230, 118, 0.35);
      transform: scale(1.03);
      color: #000;
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.9);
      color: white;
      font-weight: 600;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-md);
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      cursor: pointer;
      backdrop-filter: blur(4px);
      font-family: var(--font-body);
      white-space: nowrap;
    }
    
    .btn-outline:hover {
      background: white;
      color: var(--primary);
      border-color: white;
      transform: translateY(-2px);
    }
    
    /* 卡片组件 */
    .card-feature {
      background: var(--bg-card);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 2rem;
      transition: var(--transition-smooth);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    
    .card-feature:hover {
      border-color: var(--border-hover);
      transform: translateY(-6px);
      box-shadow: 0 20px 30px -12px rgba(155, 89, 182, 0.25);
    }
    
    .card-highlight {
      background: linear-gradient(145deg, #9B59B6 0%, #2D1B4E 100%);
      border: none;
      transform: scale(1.02);
    }
    
    .card-highlight:hover {
      transform: scale(1.05);
      box-shadow: 0 25px 35px -10px #9B59B6;
    }
    
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(13, 10, 26, 0.78);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 0.75rem 0;
      transition: background 0.3s;
    }
    
    .nav-link {
      color: #E0D7F5;
      font-weight: 500;
      padding: 0.5rem 0.8rem;
      border-radius: 6px;
      transition: var(--transition-smooth);
    }
    
    .nav-link:hover {
      color: white;
      background: rgba(255,255,255,0.08);
    }
    
    /* 汉堡菜单 */
    #mobile-menu {
      transition: transform 0.3s ease, opacity 0.25s;
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
      overflow: hidden;
    }
    
    .faq-question {
      cursor: pointer;
      padding: 1.4rem 0.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: white;
      transition: 0.2s;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
      padding-left: 0.5rem;
    }
    
    /* 六边形装饰背景图案 */
    .hex-pattern {
      background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 5 L55 17.5 L55 42.5 L30 55 L5 42.5 L5 17.5 Z' fill='none' stroke='rgba(255,255,255,0.07)' stroke-width='1'/%3E%3C/svg%3E");
      opacity: 0.3;
    }
    
    /* 动画定义 */
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 8px rgba(0,230,118,0.4); }
      50% { box-shadow: 0 0 24px rgba(0,230,118,0.8), 0 0 45px rgba(0,230,118,0.3); }
      100% { box-shadow: 0 0 8px rgba(0,230,118,0.4); }
    }
    
    .pulse-animation {
      animation: pulse-glow 2.4s infinite;
    }
    
    @media (max-width: 768px) {
      h2 {
        font-size: 2rem;
        text-align: center;
      }
      .container-custom {
        padding: 0 1.5rem;
      }
    }