:root {
  --text: #1a1a1a;
  --dim: #6b6b6b;
  --accent: #0b5fff;
  --bg: #ffffff;
  --rule: #e4e4e4;
}
* { box-sizing: border-box; }
body {
  margin: 0 auto;
  max-width: 40rem;
  padding: 2rem 1.25rem 4rem;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  font-size: 1rem;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
header nav { margin-bottom: 3rem; font-size: 0.95rem; }
header nav a { color: var(--text); }
header nav a.brand { font-weight: 700; }
header nav .sep { color: var(--dim); margin: 0 0.5rem; }
header nav a { margin-right: 0.9rem; }
.zh-tag { font-size: 0.7rem; color: var(--dim); margin-left: 0.15rem; }
h1 { font-size: 1.5rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.15rem; margin-top: 2.25rem; }
.subtitle { color: var(--dim); margin-top: 0; }
p, li { margin: 0.75rem 0; }
ul { padding-left: 1.4rem; }
hr { border: none; border-top: 1px solid var(--rule); margin: 2.5rem 0; }
.dim { color: var(--dim); font-size: 0.9rem; }
article { margin-top: 2rem; }
article h1 { margin-bottom: 0; }
.post-list { list-style: none; padding: 0; }
.post-list li { margin: 0.9rem 0; }
.post-list .date { color: var(--dim); font-size: 0.85rem; margin-right: 0.5rem; }
footer { margin-top: 4rem; border-top: 1px solid var(--rule); padding-top: 1.5rem; font-size: 0.9rem; }
footer p { margin: 0.3rem 0; }
blockquote { border-left: 3px solid var(--rule); margin-left: 0; padding-left: 1rem; color: var(--dim); }
code { background: #f4f4f4; padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.9em; }