:root { color-scheme: light; }
  * { box-sizing: border-box; }
  body {
    margin: 0; min-height: 100vh;
    background: radial-gradient(circle at 50% 0%, #f4f7fb, #d5dde6 55%, #c3ccd6);
    font-family: "Noto Sans CJK TC", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
    color: #1c2430;
  }
  .wrap { max-width: 480px; margin: 0 auto; padding: 18px 14px 28px; }
  .banner {
    background: #fff8f0; color: #8d1d1d; border: 2px solid #e0a3a3;
    border-radius: 12px; padding: 10px 12px; font-weight: 700;
    text-align: center; line-height: 1.45; font-size: 15px;
    box-shadow: 0 6px 16px rgba(120, 30, 30, .08);
  }
  .modes { display: flex; gap: 8px; margin: 12px 0; }
  .modes button {
    flex: 1; border: 0; border-radius: 999px; padding: 8px 0; font-weight: 700;
    background: #e7edf3; color: #314052; cursor: pointer; font-size: 16px;
  }
  .modes button.on { background: #243140; color: #fff; }
  .device {
    background: linear-gradient(180deg, #f7f8f8 0%, #d7dbdf 38%, #c5cbcf 100%);
    border-radius: 36px; padding: 14px 14px 18px;
    box-shadow: 0 18px 40px rgba(30,40,50,.28), inset 0 0 0 2px #eceff1, inset 0 0 0 10px #1b1e22;
  }
  .brand { display: flex; justify-content: space-between; align-items: center; padding: 6px 8px 2px; }
  .brand img { width: 148px; height: auto; display: block; }
  .solar {