/* roulang page: index */
:root {
      --primary: #0A84FF;
      --accent: #00F0FF;
      --bg-deep: #0B0E14;
      --bg-card: #141820;
      --bg-glass: rgba(20, 24, 32, 0.7);
      --text-primary: #F0F2F5;
      --text-secondary: #A0A8B4;
      --border-light: rgba(10, 132, 255, 0.15);
      --border-glow: rgba(0, 240, 255, 0.4);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-lg: 16px;
      --radius-md: 12px;
      --font-mono: 'SF Mono', 'Menlo', 'Courier New', monospace;
      --transition-fast: 0.2s;
      --transition-smooth: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 自定义玻璃拟态卡片 */
    .glass-card {
      background: var(--bg-glass);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      padding: 28px 24px;
      transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.3);
      box-shadow: 0 12px 36px rgba(0, 0, 0, 0.5);
    }
    /* 服务卡片上浮效果 */
    .service-card {
      background: var(--bg-glass);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .service-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 240, 255, 0.5);
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
    }
    /* 主按钮 */
    .btn-primary {
      background: var(--primary);
      border: none;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 8px;
      font-size: 1rem;
      cursor: pointer;
      transition: box-shadow var(--transition-smooth), background var(--transition-fast);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
      background: #0B8AFF;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--text-primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 8px;
      font-size: 1rem;
      cursor: pointer;
      transition: all var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      backdrop-filter: blur(4px);
    }
    .btn-outline:hover {
      border-color: var(--accent);
      background: rgba(10, 132, 255, 0.1);
      color: white;
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    /* 霓虹链接 */
    .link-glow {
      color: var(--text-secondary);
      text-decoration: none;
      border-bottom: 1px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .link-glow:hover {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    /* 导航栏滚动样式 */
    .nav-scrolled {
      background: rgba(11, 14, 20, 0.85) !important;
      backdrop-filter: blur(16px) !important;
      -webkit-backdrop-filter: blur(16px) !important;
      border-bottom: 1px solid var(--primary) !important;
    }
    /* 移动端菜单 */
    .mobile-menu {
      transition: opacity 0.3s ease, visibility 0.3s;
    }
    .mobile-menu.hidden-menu {
      opacity: 0;
      visibility: hidden;
      pointer-events: none;
    }
    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      padding-bottom: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding-bottom: 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: var(--accent);
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 14px;
    }
    /* 进度条样式 */
    .progress-bar {
      height: 8px;
      background: rgba(255,255,255,0.1);
      border-radius: 4px;
      overflow: hidden;
      width: 100%;
    }
    .progress-fill {
      height: 100%;
      background: var(--primary);
      border-radius: 4px;
      box-shadow: 0 0 8px var(--accent);
      width: 0%;
    }
    /* 输入框 */
    .glass-input {
      background: rgba(20,24,32,0.6);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-light);
      border-radius: 8px;
      padding: 12px 16px;
      color: white;
      outline: none;
      transition: border-color 0.2s;
      width: 100%;
    }
    .glass-input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 8px rgba(0,240,255,0.3);
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
      .glass-card, .service-card {
        padding: 20px 16px;
      }
    }