:root {
      --arrow-width: 400px;     /* 可在此修改箭头图大小 */
      --main-img-width: 80%;   /* 可修改主图宽度 */
    }

    * { 
      box-sizing: border-box; 
      margin: 0; 
      padding: 0; 
    }
    body {
      font-family: "Helvetica Neue", sans-serif;
      background: linear-gradient(135deg, #89f7fe, #66a6ff);
      height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #333;
    }
    .container {
      background: #fff;
      padding: 40px;
      border-radius: 20px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.2);
      text-align: center;
      max-width: 400px;
      width: 90%;
    }
    h1 {
      font-size: 28px;
      margin-bottom: 10px;
    }
    p {
      font-size: 16px;
      margin-bottom: 20px;
    }
    a.button {
      display: inline-block;
      padding: 12px 24px;
      background: #66a6ff;
      color: white;
      border-radius: 30px;
      text-decoration: none;
      font-weight: bold;
      transition: background 0.3s ease;
    }
    a.button:hover {
      background: #4a90e2;
    }

    /* 引导页样式 */
    .guide {
      display: none;
      position: fixed;
      top: 0; left: 0;
      width: 100%;
      height: 100%;
      background: #fff;
      color: #000;
      overflow: hidden;
      text-align: center;
    }
    .guide img.arrow {
      position: absolute;
      top: 20px;
      left: 50%; /* 水平居中 */
      transform: translateX(-50%); /* 精确居中 */
      width: var(--arrow-width); /* 使用变量控制大小 */
      height: auto;
      z-index: 10;
    }
    .guide .text {
      margin-top: 150px;
      font-size: 20px;
      font-weight: bold;
      line-height: 1.6;
    }
    .guide img.main-img {
      display: block;
      max-width: var(--main-img-width); /* 使用变量控制宽度 */
      width: 100%;
      height: auto;
      margin: 40px auto 0 auto;
    }