/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --plasma-purple: #A855F7;
      --pulse-cyan: #22D3EE;
      --champion-gold: #FBBF24;
      --deep-arena: #0B0C10;
      --charcoal-gray: #1A1C23;
      --text-primary: #F1F5F9;
      --text-secondary: #94A3B8;
      --card-bg: rgba(26, 28, 35, 0.8);
      --border-gradient: linear-gradient(135deg, var(--plasma-purple), var(--pulse-cyan));
      --radius-lg: 12px;
      --shadow-glow: 0 0 20px rgba(168,85,247,0.3);
      --font-numbers: 'Orbitron', 'Rajdhani', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--deep-arena);
      color: var(--text-primary);
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
    }
    /* 自定义字体类 */
    .font-numbers {
      font-family: var(--font-numbers);
      letter-spacing: 0.02em;
    }
    .text-gradient {
      background: linear-gradient(to right, var(--plasma-purple), var(--pulse-cyan));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .border-gradient {
      border: 1px solid transparent;
      background-image: linear-gradient(rgba(26,28,35,0.8), rgba(26,28,35,0.8)), var(--border-gradient);
      background-origin: border-box;
      background-clip: padding-box, border-box;
    }
    /* 导航栏固定与模糊效果 */
    .navbar-glass {
      background: rgba(11, 12, 16, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(11,12,16,0.85), rgba(11,12,16,0.85)), linear-gradient(90deg, var(--plasma-purple), var(--pulse-cyan));
      background-origin: border-box;
      background-clip: padding-box, border-box;
    }
    /* 能量网格纹理（Hero背景） */
    .hero-mesh {
      background-color: #0B0C10;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 60 60"><path d="M0 0 L60 0 L60 60 L0 60 Z" fill="none" stroke="rgba(168,85,247,0.08)" stroke-width="1"/><path d="M30 0 L30 60 M0 30 L60 30" stroke="rgba(34,211,238,0.05)" stroke-width="1"/></svg>');
      background-size: 60px 60px;
    }
    /* hover 卡片效果 */
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 0 25px rgba(168,85,247,0.4);
      border-color: var(--pulse-cyan);
      transition: all 0.25s ease;
    }
    /* FAQ 折叠动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.2s;
      background: rgba(26,28,35,0.4);
      border-radius: 0 0 8px 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 180px;
      padding: 1rem 1.5rem;
    }
    .faq-item.active .faq-indicator {
      border-left: 3px solid var(--pulse-cyan);
    }
    /* 移动端菜单动画 */
    .mobile-menu {
      transition: opacity 0.3s ease, transform 0.3s ease;
      opacity: 0;
      transform: translateY(-10px);
      pointer-events: none;
    }
    .mobile-menu.open {
      opacity: 1;
      transform: translateY(0);
      pointer-events: auto;
    }
    /* 装饰性准星图标 */
    .crosshair-decor {
      position: absolute;
      bottom: 2rem;
      right: 2rem;
      opacity: 0.2;
      font-size: 3rem;
      color: var(--plasma-purple);
    }
    /* 按钮发光 */
    .btn-glow:hover {
      box-shadow: 0 0 18px rgba(168,85,247,0.7);
    }