:root { color-scheme: light; --page-background: #f5f8fc; }
* { box-sizing: border-box; }
html { min-width: 0; background: var(--page-background); }
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: #424b55;
}
/* 横版图完整主体为 1448 × 1028；按屏幕高度缩放，保留全部主体。 */
.hero {
  width: min(100%, calc((100vh - 52px) * 1.40856031));
  width: min(100%, calc((100svh - 52px) * 1.40856031));
  flex: none;
}
.artwork { position: relative; width: 100%; aspect-ratio: 1448 / 1028; overflow: hidden; }
picture { display: block; }
.artwork img { display: block; width: 100%; height: auto; }
.asset-notice { position: absolute; inset: 0; padding: 48px 20px; text-align: center; line-height: 1.8; }
[hidden] { display: none !important; }
.site-footer {
  width: 100%;
  flex: 1 0 auto;
  display: flex;
  justify-content: center;
  align-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 10px;
  min-height: 52px;
  padding: 10px 12px;
  padding-bottom: max(10px, env(safe-area-inset-bottom));
  background: var(--page-background);
  font-size: 14px;
  line-height: 1.7;
  text-align: center;
}
.site-footer a { color: #0645b5; text-decoration: underline; text-underline-offset: 3px; }
.site-footer a:focus-visible { outline: 2px solid #1666bc; outline-offset: 4px; }
@media (max-width: 767px) {
  .hero { width: 100%; }
  /* 竖版图底部从 y=1575 开始为旧备案栏，仅隐藏该区域。 */
  .artwork { aspect-ratio: 941 / 1575; }
  .site-footer { flex: none; gap: 3px 8px; font-size: clamp(11px, 2.9vw, 13px); }
  .site-footer .separator { display: none; }
  .site-footer > span:last-child { flex-basis: 100%; overflow-wrap: anywhere; }
}