/* roulang page: index */
:root {
      --primary-purple: #7B2FBE;
      --primary-purple-light: #A855F7;
      --accent-gold: #F59E0B;
      --highlight-teal: #06D6A0;
      --bg-deep: #0A0A0F;
      --bg-card: #16161F;
      --text-light: #F1F1F1;
      --text-muted: #A0A0B0;
      --border-subtle: rgba(255,255,255,0.06);
      --border-purple-glow: rgba(168,85,247,0.4);
      --shadow-purple: 0 4px 24px rgba(168,85,247,0.12);
      --shadow-purple-hover: 0 8px 32px rgba(168,85,247,0.25);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-data: "Bebas Neue", "DIN Alternate", sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-heading);
      background-color: var(--bg-deep);
      color: var(--text-light);
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航基础 */
    #main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
      backdrop-filter: blur(12px);
      background-color: rgba(10,10,15,0.7);
    }
    #main-nav.scrolled {
      background-color: rgba(10,10,15,0.95);
      backdrop-filter: blur(16px);
    }
    
    .nav-link {
      color: #ccc;
      transition: color 0.2s;
      font-weight: 500;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--accent-gold);
    }
    .nav-link.active::before {
      content: '';
      position: absolute;
      left: -12px;
      top: 50%;
      transform: translateY(-50%);
      width: 6px;
      height: 6px;
      background: var(--accent-gold);
      border-radius: 50%;
    }
    
    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #7B2FBE, #A855F7);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.3s;
      box-shadow: 0 4px 12px rgba(168,85,247,0.3);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 0 20px rgba(168,85,247,0.5);
      transform: translateY(-2px);
    }
    
    .btn-outline-gold {
      background: transparent;
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      border-radius: var(--radius-btn);
      padding: 10px 26px;
      font-weight: 600;
      transition: all 0.3s;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-outline-gold:hover {
      background: var(--accent-gold);
      color: #0A0A0F;
      border-color: var(--accent-gold);
    }
    
    .text-link {
      color: var(--accent-gold);
      text-decoration: none;
      position: relative;
      font-weight: 500;
      transition: color 0.3s;
    }
    .text-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 1.5px;
      background: var(--highlight-teal);
      transition: width 0.3s;
    }
    .text-link:hover {
      color: var(--highlight-teal);
    }
    .text-link:hover::after {
      width: 100%;
    }
    
    /* 卡片系统 */
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-purple);
      transition: all 0.35s ease;
      height: 100%;
    }
    .card:hover {
      border-color: var(--border-purple-glow);
      box-shadow: var(--shadow-purple-hover);
      transform: translateY(-4px);
    }
    
    /* 装饰分隔线 */
    .divider-gradient {
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(168,85,247,0.4), transparent);
      width: 100%;
    }
    
    /* 数据字体 */
    .stat-number {
      font-family: var(--font-data);
      color: var(--accent-gold);
    }
    
    /* 手风琴动画 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-in-out;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }
    
    /* 背景光效 */
    .hero-glow {
      position: absolute;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(168,85,247,0.2) 0%, transparent 70%);
      filter: blur(60px);
      pointer-events: none;
    }
    
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .mobile-menu {
        display: none;
      }
      .mobile-menu.open {
        display: flex;
      }
    }