:root {
  color-scheme: dark;
  --bg: #111;
  --panel: #1a1a1a;
  --line: #343434;
  --text: #eee;
  --muted: #b9b9b9;
  --link: #8fc7ff;
}
* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Arial, "Malgun Gothic", sans-serif;
  line-height: 1.75;
}
a { color: var(--link); text-underline-offset: .2em; }
.site-header, footer {
  display: flex;
  gap: 18px;
  justify-content: space-between;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
  padding: 18px 24px;
}
.site-header nav { display: flex; flex-wrap: wrap; gap: 14px; }
main {
  width: min(960px, calc(100% - 32px));
  margin: 16px auto 40px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
}
h1, h2 { line-height: 1.35; }
figure { margin: 24px 0; }
img { display: block; width: 100%; height: auto; border-radius: 10px; }
.content { color: var(--text); }
.related { margin-top: 32px; padding-top: 18px; border-top: 1px solid var(--line); }
.related ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 24px; }
.hub-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.hub-grid a { padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; }
footer { color: var(--muted); }
@media (max-width: 680px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  main { width: 100%; margin: 0; border-inline: 0; border-radius: 0; padding: 22px 18px; }
  .related ul, .hub-grid { grid-template-columns: 1fr; }
}