:root {
  --ink: #152330;
  --muted: #5d6b78;
  --teal: #0b766c;
  --canvas: #f5f7f8;
  --surface: #ffffff;
  --line: #e3e8ec;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6edf2;
    --muted: #9aa8b4;
    --teal: #79d8c0;
    --canvas: #0f1a22;
    --surface: #152330;
    --line: #26394a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 15px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}
a { color: var(--teal); }
.bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  justify-content: space-between;
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 16px;
}
.brand { font-weight: 700; font-size: 18px; text-decoration: none; letter-spacing: -0.3px; }
.bar nav { display: flex; gap: 16px; font-size: 14px; }
main { max-width: 820px; margin: 0 auto; padding: 0 16px 24px; }
article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px clamp(18px, 5vw, 44px);
  margin-bottom: 24px;
}
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 4px; letter-spacing: -0.5px; }
h2 { font-size: 17px; margin: 28px 0 6px; }
.meta, .note { color: var(--muted); font-size: 13px; }
ul { padding-left: 1.3em; }
li { margin: 4px 0; }
.foot { color: var(--muted); font-size: 13px; justify-content: center; padding-bottom: 36px; }