/* AI-AG minimalist landing page */
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: #000; color: #fff;
}
.hero {
  position: relative; height: 100vh; width: 100%; overflow: hidden;
  display: grid; place-items: center;
}
.bgimg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover;  /* 如需不裁剪，改为 contain */
  object-position: center;
}
.centered {
  position: relative; z-index: 1;
  font-size: clamp(28px, 6vw, 72px);
  font-weight: 800;
  letter-spacing: .28em; text-indent: .28em;
  text-shadow: 0 4px 20px rgba(0,0,0,.45);
  text-align: center;
  top: -24vh;
}