/* roulang page: index */
/* 自定义CSS变量与全局重置 */
    :root {
      --bg-deep: #0A0E17;
      --primary-cyan: #00E5FF;
      --secondary-violet: #7B2FFF;
      --accent-red: #FF3366;
      --text-main: #E0E6F0;
      --text-muted: #8892A6;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 229, 255, 0.15);
      --glass-blur: blur(20px);
      --card-radius: 16px;
      --shadow-deep: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-cyan: 0 0 20px rgba(0, 229, 255, 0.5), 0 0 60px rgba(0, 229, 255, 0.2);
      --glow-violet: 0 0 15px rgba(123, 47, 255, 0.4);
      --font-titles: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-deep);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 自定义容器 */
    .container-custom {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 玻璃拟态卡片基类 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-deep);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: rgba(0, 229, 255, 0.4);
      transform: translateY(-4px);
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 25px rgba(0, 229, 255, 0.2);
    }

    /* 发光按钮主样式 */
    .btn-glow {
      background: var(--primary-cyan);
      color: #0A0E17;
      font-weight: 600;
      border-radius: 40px;
      padding: 0.9rem 2.2rem;
      font-size: 1rem;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      border: none;
      cursor: pointer;
      box-shadow: var(--glow-cyan);
      transition: all 0.25s ease;
      text-decoration: none;
      font-family: var(--font-body);
    }

    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.8), 0 0 80px rgba(0, 229, 255, 0.4);
      transform: scale(1.03);
      filter: brightness(1.1);
    }

    .btn-outline-glow {
      background: transparent;
      border: 1.5px solid var(--primary-cyan);
      color: var(--primary-cyan);
      box-shadow: 0 0 10px rgba(0, 229, 255, 0.2);
      background: rgba(0, 229, 255, 0.05);
    }

    .btn-outline-glow:hover {
      background: rgba(0, 229, 255, 0.15);
      color: white;
      box-shadow: 0 0 28px rgba(0, 229, 255, 0.7);
      transform: scale(1.03);
    }

    /* 导航样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10, 14, 23, 0.75);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.15);
      z-index: 50;
      display: flex;
      align-items: center;
      transition: 0.3s;
    }

    .nav-logo {
      font-family: var(--font-titles);
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      text-shadow: 0 0 15px var(--primary-cyan);
      letter-spacing: 1px;
      text-decoration: none;
    }

    .nav-link {
      color: var(--text-muted);
      font-weight: 500;
      transition: color 0.2s;
      text-decoration: none;
      font-size: 0.95rem;
    }

    .nav-link:hover {
      color: var(--primary-cyan);
      text-shadow: 0 0 8px rgba(0, 229, 255, 0.6);
    }

    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 12px;
      left: 10px;
      right: 10px;
      background: rgba(20, 25, 35, 0.8);
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      border: 1px solid rgba(0, 229, 255, 0.2);
      border-radius: 40px;
      padding: 0.5rem 1rem;
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 55;
      box-shadow: 0 10px 30px rgba(0,0,0,0.7);
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 0.7rem;
      transition: 0.2s;
      text-decoration: none;
    }
    .mobile-nav-item i {
      font-size: 1.3rem;
      margin-bottom: 2px;
    }
    .mobile-nav-item.active {
      color: var(--primary-cyan);
      text-shadow: 0 0 12px var(--primary-cyan);
    }

    /* 粒子背景容器 */
    .hero-particles {
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      overflow: hidden;
      z-index: 0;
    }
    .particle {
      position: absolute;
      background: var(--primary-cyan);
      border-radius: 50%;
      opacity: 0.25;
      animation: float 8s infinite ease-in-out;
      box-shadow: 0 0 12px var(--primary-cyan);
    }
    @keyframes float {
      0% { transform: translateY(0px) scale(1); opacity: 0.2; }
      50% { transform: translateY(-30px) scale(1.2); opacity: 0.5; }
      100% { transform: translateY(0px) scale(1); opacity: 0.2; }
    }

    /* FAQ箭头动画 */
    .faq-arrow {
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }

    /* 数据计数发光 */
    .stat-number {
      font-family: var(--font-mono);
      background: linear-gradient(135deg, #00E5FF 0%, #7B2FFF 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-shadow: 0 0 18px rgba(0,229,255,0.5);
    }

    @media (max-width: 768px) {
      .desktop-nav-links {
        display: none !important;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .navbar {
        height: 56px;
      }
      h1 {
        font-size: 2rem !important;
      }
    }
    @media (min-width: 769px) {
      .mobile-bottom-nav {
        display: none !important;
      }
    }