:root {
  --bg: #f7f8fb;
  --paper: #ffffff;
  --ink: #1c2430;
  --muted: #6b7686;
  --line: #e2e6ee;
  --accent: #2f6fed;
  --accent-soft: #e8f0ff;
  --code-bg: #101828;
  --code-ink: #d7e0ee;
  --font: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.75 var(--font);
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 820px; margin: 0 auto; padding: 0 22px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* header */
.site-head {
  display: flex; align-items: baseline; gap: 14px;
  padding-top: 34px; padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 20px; color: var(--ink); }
.brand:hover { text-decoration: none; color: var(--accent); }
.tagline { color: var(--muted); font-size: 14px; }

/* hero + index */
.hero { padding: 44px 0 8px; }
.hero-sub { color: var(--muted); font-size: 17px; margin: 0; }
.entries { padding: 18px 0 60px; }
.entry {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px 22px;
  margin: 14px 0;
}
.entry h2 { margin: 6px 0 6px; font-size: 20px; line-height: 1.4; }
.entry h2 a { color: var(--ink); }
.entry h2 a:hover { color: var(--accent); text-decoration: none; }
.summary { margin: 6px 0 0; color: var(--muted); font-size: 14.5px; }
.entry-meta, .post-meta { color: var(--muted); font: 500 12.5px var(--mono); }
.tag {
  display: inline-block; margin-left: 8px; padding: 1px 8px;
  background: var(--accent-soft); color: var(--accent);
  border-radius: 20px; font-size: 12px; line-height: 1.7;
}

/* post */
.post {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 34px 38px 40px;
  margin: 26px 0 10px;
}
.post-head { border-bottom: 1px solid var(--line); padding-bottom: 18px; margin-bottom: 10px; }
.post-head h1 { margin: 10px 0 0; font-size: 30px; line-height: 1.35; }
.lead { color: var(--muted); font-size: 16.5px; margin: 14px 0 0; }
.back { margin: 0 0 50px; font-size: 14.5px; }

.post-body h2 {
  font-size: 23px; margin: 34px 0 12px; padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.post-body h3 { font-size: 18.5px; margin: 28px 0 10px; }
.post-body h4 { font-size: 16.5px; margin: 22px 0 8px; }
.post-body p { margin: 14px 0; }
.post-body ul, .post-body ol { margin: 12px 0; padding-left: 26px; }
.post-body li { margin: 5px 0; }
.post-body li > ul, .post-body li > ol { margin: 5px 0; }
.post-body code {
  font: 500 13.5px var(--mono);
  background: #eef1f7; border-radius: 4px;
  padding: 2px 6px; color: #b23c5e;
}
.post-body pre {
  background: var(--code-bg); color: var(--code-ink);
  border-radius: 8px; padding: 16px 18px; overflow-x: auto;
  font: 400 13.5px/1.7 var(--mono);
}
.post-body pre code { background: none; color: inherit; padding: 0; font-weight: 400; }
.post-body blockquote {
  margin: 16px 0; padding: 4px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft); border-radius: 0 6px 6px 0;
  color: #3a4658;
}
.post-body blockquote p { margin: 8px 0; }
.post-body table {
  width: 100%; border-collapse: collapse; margin: 18px 0;
  font-size: 14.5px; overflow: hidden; border-radius: 8px;
}
.post-body th, .post-body td {
  border: 1px solid var(--line); padding: 8px 12px; text-align: left;
}
.post-body th { background: #f0f3f9; font-weight: 600; }
.post-body tr:nth-child(even) td { background: #fafbfe; }
.post-body hr { border: 0; border-top: 1px solid var(--line); margin: 30px 0; }
.post-body img { max-width: 100%; border-radius: 8px; border: 1px solid var(--line); }

/* footer */
.site-foot {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 26px 22px 40px; color: var(--muted); font-size: 13.5px;
  border-top: 1px solid var(--line); margin-top: 20px;
}

@media (max-width: 560px) {
  .site-head { flex-direction: column; gap: 2px; }
  .post { padding: 24px 20px 28px; }
  .post-head h1 { font-size: 24px; }
}