/* roulang page: index */
:root {
      --bg-primary: #0A0E27;
      --bg-card: rgba(26, 31, 58, 0.7);
      --bg-input: #121632;
      --accent-cyan: #00E5FF;
      --accent-purple: #7B2FFF;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8D0;
      --text-muted: #6B7280;
      --border-light: rgba(0, 229, 255, 0.15);
      --border-glow: rgba(0, 229, 255, 0.5);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --glass-blur: blur(12px);
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--bg-primary);
      color: var(--text-primary);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', sans-serif;
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    @media (max-width: 640px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-glow);
      box-shadow: 0 12px 40px rgba(0, 229, 255, 0.15);
    }

    /* 导航栏 */
    .header {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.1);
      position: sticky;
      top: 0;
      z-index: 50;
    }
    .nav-link {
      color: var(--text-secondary);
      transition: color 0.2s;
      font-weight: 500;
    }
    .nav-link:hover {
      color: var(--accent-cyan);
    }
    .nav-link.active {
      color: var(--accent-cyan);
      box-shadow: 0 2px 0 var(--accent-cyan);
    }

    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.5);
      transform: translateY(-1px);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-secondary:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: white;
      color: white;
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 500;
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-ghost:hover {
      border-color: white;
    }

    @media (max-width: 640px) {
      .btn-primary, .btn-secondary, .btn-ghost {
        width: 100%;
        padding: 14px 20px;
      }
    }

    /* 渐变文字 */
    .text-gradient {
      background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 发光边框动画 */
    .glow-border {
      border: 1px solid var(--border-light);
      transition: border-color 0.3s;
    }
    .glow-border:hover {
      border-color: var(--border-glow);
    }

    /* 手风琴 */
    .faq-item {
      background: rgba(26, 31, 58, 0.6);
      border: 1px solid rgba(0, 229, 255, 0.1);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: transparent;
      width: 100%;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 20px;
      color: var(--text-secondary);
    }
    .faq-item.active {
      border-color: rgba(0, 229, 255, 0.4);
      box-shadow: 0 0 12px rgba(0, 229, 255, 0.1);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    /* 背景纹理模拟 */
    .hero-bg {
      background-image: radial-gradient(circle at 30% 40%, rgba(0,229,255,0.08) 0%, transparent 35%),
                        linear-gradient(135deg, #0A0E27 0%, #121632 100%);
      position: relative;
    }
    .hero-bg::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      pointer-events: none;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }

    .animate-pulse-glow {
      animation: pulseGlow 2s infinite;
    }
    @keyframes pulseGlow {
      0% { box-shadow: 0 0 5px rgba(0,229,255,0.4); }
      50% { box-shadow: 0 0 20px rgba(0,229,255,0.7); }
      100% { box-shadow: 0 0 5px rgba(0,229,255,0.4); }
    }