/* roulang page: index */
:root {
      --primary: #0A0E27;
      --accent: #00F0FF;
      --emphasis: #7B2FFF;
      --bg-deeper: #060918;
      --bg-lighter: #0D1130;
      --text-main: #FFFFFF;
      --text-body: #B0C4DE;
      --text-weak: #6B7B8D;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --neon-glow: 0 0 18px rgba(0, 240, 255, 0.5);
      --neon-strong: 0 0 30px rgba(0, 240, 255, 0.8);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", 'Inter', 'SF Pro Display', system-ui, sans-serif;
      background-color: var(--primary);
      color: var(--text-body);
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

    /* 自定义背景网格光点效果 */
    .bg-mesh {
      background-image: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.03) 1px, transparent 1px);
      background-size: 64px 64px;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      box-shadow: var(--glass-shadow);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.4);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.2), 0 8px 32px rgba(0,0,0,0.5);
      transform: translateY(-4px);
    }

    /* 霓虹按钮 */
    .btn-primary {
      background-color: var(--accent);
      color: var(--primary);
      font-weight: 700;
      border-radius: 8px;
      padding: 12px 28px;
      min-height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--neon-glow);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      letter-spacing: 0.02em;
    }
    .btn-primary:hover {
      box-shadow: var(--neon-strong);
      transform: scale(1.03);
      background-color: #33F5FF;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      font-weight: 600;
      border-radius: 8px;
      padding: 12px 28px;
      min-height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.08);
      box-shadow: var(--neon-glow);
      border-color: #33F5FF;
      color: #FFFFFF;
    }

    /* 导航栏 */
    .nav-blur {
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.3);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .nav-link {
      color: var(--text-body);
      font-weight: 500;
      transition: color 0.2s, box-shadow 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link.active {
      color: var(--accent);
      box-shadow: 0 2px 0 0 var(--accent);
      text-shadow: 0 0 8px var(--accent);
    }

    /* 移动端菜单 */
    .mobile-menu {
      background: rgba(10, 14, 39, 0.96);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(0,240,255,0.2);
    }
    .menu-divider {
      border-bottom: 1px solid rgba(0,240,255,0.12);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,240,255,0.08);
    }
    .faq-question {
      background: rgba(255,255,255,0.02);
      transition: background 0.2s;
    }
    .faq-question.active {
      background: rgba(0,240,255,0.03);
    }
    .faq-answer {
      color: var(--text-body);
      padding: 0 0 16px 0;
    }

    /* 输入框样式 */
    .input-field {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(0,240,255,0.15);
      border-radius: 8px;
      color: #FFFFFF;
      padding: 12px 16px;
      transition: 0.2s;
      outline: none;
    }
    .input-field:focus {
      border-color: var(--accent);
      box-shadow: 0 0 10px rgba(0,240,255,0.2);
    }

    /* 渐变文字 */
    .text-gradient {
      background: linear-gradient(135deg, #FFFFFF 0%, #00F0FF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 滚动动画隐藏默认样式 */
    .case-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .case-scroll::-webkit-scrollbar-thumb {
      background: rgba(0,240,255,0.3);
      border-radius: 8px;
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
      h1 {
        font-size: 36px;
        line-height: 44px;
      }
      h2 {
        font-size: 28px;
        line-height: 36px;
      }
    }