/* Created by Joshua Shen / Claude Opus 5 on 10/24/26. */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #16181a;
  --muted: #555b63;
  --accent: #0b7a3e;
  --rule: #e2e5e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #07090a;
    --fg: #eef0f2;
    --muted: #a6adb6;
    --accent: #4fd68a;
    --rule: #262a2e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0 auto;
  max-width: 42rem;
  padding: 1.5rem 1rem 3rem;
  background: var(--bg);
  color: var(--fg);
  font: 1rem/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); text-underline-offset: 0.15em; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
header { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.5rem 1rem; }
header nav a { margin-left: 1rem; }
header nav a:first-child { margin-left: 0; }
.brand { margin: 0; font-size: 1.25rem; font-weight: 700; }
.brand a { color: inherit; text-decoration: none; }
h1 { font-size: 1.75rem; line-height: 1.25; margin: 2rem 0 0.75rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.5rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.25rem; }
p { margin: 0 0 0.75rem; }
.meta { color: var(--muted); }
section + section { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule); }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: 0.9rem; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; padding: 0.5rem 0.75rem; background: var(--bg); }