@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap');

    html {
      scroll-behavior: smooth;
    }

    body {
      cursor: default;
      /* 升级系统默认后备字体，确保中文字体在各端清晰、饱满 */
      font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    /* 顶部微量进度条 */
    .scroll-progress {
      position: fixed;
      top: 0;
      left: 0;
      height: 2px;
      background: #0066FF;
      z-index: 9999;
      width: 0%;
    }

    /* 极轻量冷色粒子背景 */
    #particles {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      z-index: 0;
      opacity: 0.6;
    }

    /* 浮动与渐现动效 */
    .animate-float {
      animation: float 5s ease-in-out infinite;
    }

    .animate-fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: 0.8s cubic-bezier(0.215, 0.610, 0.355, 1);
    }
    .animate-fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }

    .text-reveal {
      opacity: 0;
    }
    .text-reveal.visible {
      animation: textReveal 1s forwards cubic-bezier(0.215, 0.610, 0.355, 1);
    }

    /* 大厂风克制卡片悬浮 */
    .quark-card {
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
      border: 1px solid #E5E7EB;
    }
    .quark-card:hover {
      transform: translateY(-4px);
      border-color: #0066FF;
      box-shadow: 0 12px 30px rgba(0, 102, 255, 0.06);
      background-color: #FAFAFA;
    }

    /* 按钮纯色流体 */
    .btn-quark {
      background: #0066FF;
      transition: all 0.25s ease;
    }
    .btn-quark:hover {
      background: #0052CC;
      box-shadow: 0 4px 12px rgba(0, 102, 255, 0.15);
    }

    /* 导航高亮 */
    .nav-link.active {
      color: #0066FF;
      font-weight: 600;
    }
    .nav-link.active::after {
      /*content: '';*/
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 4px;
      height: 4px;
      background: #0066FF;
      border-radius: 50%;
    }

    /* 点击波纹 */
    .ripple {
      position: absolute;
      width: 20px;
      height: 20px;
      background: rgba(255,255,255,0.2);
      border-radius: 50%;
      transform: scale(0);
      animation: rippleAnim 0.5s linear;
      pointer-events: none;
    }

    /* 阿里云盘风生态卡片微悬浮 */
    .eco-card {
      transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid #E5E7EB;
    }
    .eco-card:hover {
      transform: translateY(-5px);
      border-color: rgba(0, 102, 255, 0.4);
      box-shadow: 0 20px 40px rgba(0, 102, 255, 0.06);
    }

    @keyframes rippleAnim {
      to { transform: scale(15); opacity: 0; }
    }
    @keyframes textReveal {
      from { opacity:0; transform: translateY(10px); }
      to { opacity:1; transform: translateY(0); }
    }
    @keyframes float {
      0%,100% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
    }