:root {
  --bg: #fdfdfc;
  --fg: #1f2328;
  --muted: #6a737d;
  --line: #e3e5e8;
  --accent: #0b6e4f;
  --code-bg: #f4f5f7;
  --quote-bg: #f7f8f9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --fg: #e6e8ea;
    --muted: #9aa4ad;
    --line: #2b3136;
    --accent: #4ec9a0;
    --code-bg: #1c2024;
    --quote-bg: #1a1e22;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 17px;
  line-height: 1.78;
  letter-spacing: 0.01em;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- header / footer ---------- */
.site-header {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.25rem 1rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand { color: var(--fg); display: flex; align-items: baseline; gap: .6rem; }
.brand:hover { text-decoration: none; }
.brand-name { font-weight: 650; font-size: 1.05rem; }
.brand-sub { color: var(--muted); font-size: .82rem; }

.site-nav { display: flex; gap: 1rem; font-size: .9rem; }
.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--accent); text-decoration: none; }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .82rem;
  text-align: center;
  padding: 1.6rem 1.25rem 2.5rem;
}

/* ---------- home ---------- */
.home-title { font-size: 1.9rem; margin: 1rem 0 .4rem; letter-spacing: -.01em; }
.home-lead { color: var(--muted); margin-top: 0; }

.section-title {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  font-weight: 600;
  margin: 2.8rem 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--line);
}

.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li { margin-bottom: 1.9rem; }
.post-link { font-size: 1.18rem; font-weight: 620; color: var(--fg); }
.post-link:hover { color: var(--accent); text-decoration: none; }
.post-excerpt { margin: .35rem 0 .4rem; color: var(--muted); font-size: .94rem; }

.post-meta { color: var(--muted); font-size: .82rem; margin: 0; }
.tag {
  display: inline-block;
  margin-left: .5rem;
  padding: .05rem .5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .75rem;
  color: var(--muted);
}

/* ---------- post ---------- */
.post-header { margin: 1rem 0 2.2rem; }
.post-header h1 {
  font-size: 1.85rem;
  line-height: 1.4;
  margin: 0 0 .7rem;
  letter-spacing: -.01em;
}
.post-lead {
  color: var(--muted);
  font-size: .95rem;
  border-left: 3px solid var(--line);
  padding-left: .9rem;
  margin: 1rem 0 0;
}

.post-body h2 {
  font-size: 1.35rem;
  margin: 2.8rem 0 1rem;
  padding-top: .4rem;
  letter-spacing: -.005em;
}
.post-body h3 { font-size: 1.1rem; margin: 2rem 0 .7rem; }
.post-body h4 { font-size: 1rem; margin: 1.5rem 0 .5rem; }

.post-body p { margin: 1.05rem 0; }

.post-body ul, .post-body ol { padding-left: 1.4rem; margin: 1.05rem 0; }
.post-body li { margin: .4rem 0; }

.post-body blockquote {
  margin: 1.4rem 0;
  padding: .8rem 1rem;
  background: var(--quote-bg);
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-size: .94rem;
}
.post-body blockquote p { margin: .3rem 0; }

.post-body hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
}

/* ---------- code ---------- */
code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: .87em;
  background: var(--code-bg);
  padding: .12em .38em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  padding: 1rem 1.1rem;
  border-radius: 8px;
  overflow-x: auto;
  line-height: 1.6;
  font-size: .85rem;
  border: 1px solid var(--line);
}
pre code { background: none; padding: 0; font-size: 1em; }

.highlight { background: var(--code-bg); border-radius: 8px; }
.highlight pre { border: 0; margin: 0; }

/* ---------- tables ---------- */
.post-body table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: .88rem;
}
.post-body th, .post-body td {
  border: 1px solid var(--line);
  padding: .5rem .7rem;
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}
.post-body th { background: var(--quote-bg); font-weight: 620; }

/* ---------- images ---------- */
.post-body img {
  display: block;
  max-width: 100%;
  max-height: 620px;
  width: auto;
  height: auto;
  margin: 1.6rem auto;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.post-footer {
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .88rem;
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .post-header h1 { font-size: 1.55rem; }
  .post-body h2 { font-size: 1.2rem; }
}