index.html

<!DOCTYPE html>
<html lang="zh-CN" data-app-version="%APP_VERSION%">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="robots" content="none">
  <title>%VITE_TITLE%</title>
  <style>
    html {
      width: 100dvw;
      height: 100dvh;
      overflow: hidden;
      cursor: url('/icons/GensinMouse.svg') 0 0, auto;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body, #app {
      width: 100%;
      height: 100%;
      overflow: hidden;
    }

    @keyframes app-init {
      from {
        transform: translate(-50%, -50%) rotate(0deg);
      }
      to {
        transform: translate(-50%, -50%) rotate(360deg);
      }
    }

    #preloading {
      position: fixed;
      width: 100%;
      height: 100%;
      z-index: 1;
      overflow: hidden;
      display: grid;
      place-items: center;
      place-content: center;
      color: #ECE5D8;
      background-color: #25313F;
      line-height: 2em;
      &.is-end {
        opacity: 0;
        transition: opacity ease 300ms;
        &::before {
          clip-path: xywh(0 0 100% 100%);
          animation-play-state: paused;
        }
      }
      h1 {
        font-size: 24px;
        font-weight: bolder;
      }
      &::before {
        content: '';
        position: absolute;
        box-sizing: border-box;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        border: 4px solid #ECE5D8F0;
        clip-path: xywh(0 0 50% 50%);
        width: 256px;
        height: 256px;
        border-radius: 128px;
        pointer-events: none;
        animation: app-init linear 2s infinite;
      }
      &::after {
        content: '';
        position: absolute;
        box-sizing: border-box;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        border: 2px dashed #ECE5D860;
        width: 254px;
        height: 254px;
        border-radius: 128px;
        pointer-events: none;
      }
    }
  </style>
</head>

<body>
  <div id="preloading">
    <h1>初始化应用</h1>
    <div>前面的区域，马上就能探索~</div>
  </div>

  <div id="app"></div>

  <script type="module" async defer>
    const text = (() => {
      if (!window.isSecureContext)
        return '网站处于非安全上下文中，Web 应用无法正常运行。'
      return ''
    })()

    const app = document.getElementById('app')
    const preloading = document.getElementById('preloading')

    preloading.addEventListener('transitionend', () => {
      preloading.remove()
    }, { once: true })

    Reflect.set(globalThis, 'preloading', preloading)

    if (text) {
      app.innerText = text
    }
    else {
      import('./src/main.ts')
    }
  </script>
</body>
</html>