/* roulang page: index */
/* 自定义设计变量与全局重置 */
    :root {
      --deep-space: #0A0E27;
      --cyan-electric: #00F0FF;
      --magenta-pop: #FF3CAC;
      --cool-gray-bg: #F5F6FA;
      --card-white: #FFFFFF;
      --text-dark: #1E2235;
      --text-body: #3A3F5C;
      --text-muted: #6B7194;
      --shadow-sm: 0 8px 30px rgba(10, 14, 39, 0.06);
      --shadow-cyan: 0 16px 40px rgba(0, 240, 255, 0.12);
      --radius-md: 12px;
      --radius-pill: 50px;
      --transition-smooth: all 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "SF Pro Display", sans-serif;
      background-color: var(--cool-gray-bg);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    
    /* 导航样式 - 桌面毛玻璃效果 */
    .navbar-desktop {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      z-index: 50;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    
    .nav-logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: white;
      text-decoration: none;
      position: relative;
      display: inline-block;
    }
    .nav-logo::after {
      content: "";
      position: absolute;
      bottom: 2px;
      left: 0;
      width: 60%;
      height: 3px;
      background: var(--cyan-electric);
      border-radius: 4px;
    }
    
    .nav-link {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 0.5rem 1.2rem;
      transition: var(--transition-smooth);
      border-radius: 30px;
    }
    .nav-link:hover {
      color: white;
      background: rgba(255,255,255,0.1);
    }
    
    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0088CC);
      color: var(--deep-space);
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-pill);
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
      box-shadow: 0 4px 15px rgba(0,240,255,0.4);
    }
    .btn-primary:hover {
      transform: scale(1.05);
      background: linear-gradient(135deg, #0088CC, #00F0FF);
      box-shadow: 0 8px 25px rgba(0,240,255,0.6);
    }
    
    .btn-outline {
      background: transparent;
      border: 2px solid var(--cyan-electric);
      color: var(--cyan-electric);
      font-weight: 600;
      padding: 10px 26px;
      border-radius: var(--radius-pill);
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: var(--cyan-electric);
      color: var(--deep-space);
    }
    
    /* 移动端底部胶囊导航 */
    .mobile-nav {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background: #0A0E27;
      backdrop-filter: blur(16px);
      border-radius: 40px;
      padding: 8px 20px;
      display: none;
      z-index: 60;
      box-shadow: 0 10px 30px rgba(0,0,0,0.5);
      border: 1px solid rgba(255,255,255,0.15);
    }
    .mobile-nav-item {
      color: rgba(255,255,255,0.7);
      font-size: 0.7rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 6px 14px;
      border-radius: 30px;
      transition: 0.2s;
    }
    .mobile-nav-item i {
      font-size: 1.2rem;
      margin-bottom: 2px;
    }
    .mobile-nav-item.active {
      color: var(--cyan-electric);
      background: rgba(255,255,255,0.1);
    }
    
    /* Hero 粒子动画背景 */
    .hero-bg {
      background: radial-gradient(circle at 30% 40%, #1a1f3a, #0A0E27 80%);
      position: relative;
      overflow: hidden;
    }
    .particle {
      position: absolute;
      background: rgba(0,240,255,0.25);
      border-radius: 50%;
      animation: float 8s infinite;
    }
    @keyframes float {
      0% { transform: translateY(0) scale(1); opacity: 0.3; }
      50% { transform: translateY(-20px) scale(1.8); opacity: 0.7; }
      100% { transform: translateY(0) scale(1); opacity: 0.3; }
    }
    
    /* 卡片与区块 */
    .section-padding {
      padding: 100px 0;
    }
    .card-custom {
      background: var(--card-white);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      border: none;
    }
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-cyan);
    }
    
    /* 非对称优势卡片 */
    .advantage-middle {
      border-top: 6px solid var(--cyan-electric);
    }
    
    /* 数据滚动 */
    .data-number {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
      color: var(--cyan-electric);
    }
    
    /* FAQ手风琴 */
    .faq-item {
      border-left: 3px solid transparent;
      transition: 0.2s;
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
    }
    .faq-item.active {
      border-left: 3px solid var(--cyan-electric);
    }
    
    @media (max-width: 768px) {
      .navbar-desktop {
        display: none;
      }
      .mobile-nav {
        display: flex;
      }
      .section-padding {
        padding: 70px 0;
      }
      h1 {
        font-size: 2.5rem !important;
      }
    }
    
    @media (min-width: 769px) {
      .mobile-nav {
        display: none;
      }
    }