/* roulang page: index */
:root {
      --deep-purple: #0D0B1E;
      --dark-purple: #1A0A2E;
      --electric-purple: #A855F7;
      --purple-dark: #7C3AED;
      --cyan: #06B6D4;
      --cyan-light: #22D3EE;
      --amber: #F59E0B;
      --cool-gray: #9CA3AF;
      --text-primary: #F5F3FF;
      --text-secondary: #D1D5DB;
      --card-bg: rgba(255, 255, 255, 0.04);
      --card-border: rgba(255, 255, 255, 0.08);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-card: 24px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --radius-badge: 20px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, #1A0A2E 0%, #0D0B1E 70%, #0F0A1F 100%);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航玻璃质感 */
    .glass-nav {
      background: rgba(13, 11, 30, 0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      position: sticky;
      top: 0;
      z-index: 50;
    }

    .nav-link {
      color: var(--cool-gray);
      transition: all 0.2s ease;
      font-weight: 500;
      position: relative;
    }

    .nav-link:hover,
    .nav-link.active {
      color: #fff;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: linear-gradient(to right, var(--electric-purple), var(--cyan));
      transition: width 0.25s ease;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      background: rgba(13, 11, 30, 0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .mobile-nav-item {
      color: var(--cool-gray);
      transition: color 0.2s;
      font-size: 12px;
    }

    .mobile-nav-item.active {
      color: var(--electric-purple);
      text-shadow: 0 0 12px var(--electric-purple);
    }

    /* 卡片样式 */
    .card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .card:hover {
      border-color: rgba(168, 85, 247, 0.5);
      box-shadow: 0 12px 40px rgba(168, 85, 247, 0.2);
      transform: translateY(-4px);
    }

    /* 渐变文字 */
    .gradient-text {
      background: linear-gradient(135deg, var(--electric-purple) 0%, var(--cyan-light) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, var(--electric-purple), var(--purple-dark));
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      color: white;
      transition: all 0.3s ease;
      box-shadow: 0 4px 14px rgba(168, 85, 247, 0.4);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--purple-dark), var(--electric-purple));
      box-shadow: 0 0 24px rgba(168, 85, 247, 0.7);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--cool-gray);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      color: var(--text-primary);
      transition: all 0.3s ease;
      backdrop-filter: blur(8px);
    }

    .btn-outline:hover {
      border-color: var(--electric-purple);
      color: #fff;
      background: rgba(168, 85, 247, 0.1);
      box-shadow: 0 0 18px rgba(168, 85, 247, 0.4);
    }

    /* 数据徽章 */
    .badge-glow {
      background: linear-gradient(135deg, var(--cyan), var(--electric-purple));
      border-radius: 20px;
      padding: 6px 18px;
      font-weight: 700;
      color: white;
      box-shadow: 0 0 16px rgba(6, 182, 212, 0.4);
      display: inline-block;
    }

    /* 输入框 */
    input, textarea {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-input);
      padding: 12px 16px;
      color: white;
      transition: border 0.2s;
      width: 100%;
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: var(--electric-purple);
      box-shadow: 0 0 12px rgba(168, 85, 247, 0.4);
    }

    /* FAQ手风琴 */
    .faq-item {
      border-left: 3px solid transparent;
      transition: all 0.3s;
    }

    .faq-item.active {
      border-left: 3px solid var(--electric-purple);
      background: rgba(255, 255, 255, 0.03);
    }

    /* 装饰几何图形 */
    .geo-decor {
      position: absolute;
      opacity: 0.08;
      pointer-events: none;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
      h1 {
        font-size: 2.4rem !important;
      }
      .mobile-hide {
        display: none;
      }
    }