:root {
  --ink: #16181d;
  --ink-soft: #4a4f5a;
  --ink-faint: #848b96;
  --bg: #fdfdfc;
  --bg-soft: #f4f4f1;
  --line: #e3e3dd;
  --accent: #1f6f6b;
  --code-bg: #f2f2ee;
  --max: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8e8e4;
    --ink-soft: #b3b7bd;
    --ink-faint: #7d838c;
    --bg: #14161a;
    --bg-soft: #1b1e23;
    --line: #2a2e35;
    --accent: #63c9c0;
    --code-bg: #1e2228;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  /* 中文段落两端对齐会更整齐 */
  hanging-punctuation: allow-end;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.4rem;
}

/* ---------- 页头 ---------- */
.site-head {
  padding: 3.2rem 0 2.2rem;
  border-bottom: 1px solid var(--line);
}

.site-head a.brand {
  color: var(--ink);
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.site-head .tagline {
  margin: 0.45rem 0 0;
  color: var(--ink-faint);
  font-size: 0.95rem;
}

nav.top {
  margin-top: 1.1rem;
  display: flex;
  gap: 1.25rem;
  font-size: 0.92rem;
}

nav.top a {
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

nav.top a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- 文章列表 ---------- */
main { padding: 2.6rem 0 4rem; }

.post-list { list-style: none; margin: 0; padding: 0; }

.post-list li {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.post-list li:first-child { padding-top: 0; }

.post-list time {
  display: block;
  font-size: 0.82rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.post-list h2 {
  margin: 0.35rem 0 0.4rem;
  font-size: 1.2rem;
  font-weight: 640;
  line-height: 1.45;
}

.post-list h2 a {
  color: var(--ink);
  text-decoration: none;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-size: 0% 2px;
  background-repeat: no-repeat;
  background-position: 0 1.32em;
  transition: background-size 0.25s ease;
}

.post-list h2 a:hover {
  background-size: 100% 2px;
}

.post-list p.summary {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* ---------- 文章正文 ---------- */
article.post header {
  margin-bottom: 2.2rem;
}

article.post h1 {
  font-size: 1.75rem;
  line-height: 1.35;
  letter-spacing: -0.015em;
  margin: 0 0 0.6rem;
  font-weight: 680;
}

article.post .meta {
  color: var(--ink-faint);
  font-size: 0.86rem;
}

article.post .meta a { color: var(--ink-faint); }

.content > *:first-child { margin-top: 0; }

.content h2 {
  font-size: 1.25rem;
  margin: 2.4rem 0 0.9rem;
  font-weight: 640;
  letter-spacing: -0.01em;
}

.content h3 {
  font-size: 1.05rem;
  margin: 1.9rem 0 0.7rem;
  font-weight: 620;
}

.content p { margin: 0 0 1.15rem; }

.content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}

.content a:hover { border-bottom-color: var(--accent); }

.content ul, .content ol {
  margin: 0 0 1.15rem;
  padding-left: 1.4rem;
}

.content li { margin: 0.3rem 0; }

.content blockquote {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1.1rem;
  border-left: 2px solid var(--accent);
  color: var(--ink-soft);
}

.content blockquote p:last-child { margin-bottom: 0; }

.content code {
  background: var(--code-bg);
  padding: 0.14em 0.36em;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: "SF Mono", ui-monospace, "Cascadia Code", Consolas, "Courier New", monospace;
}

.content pre {
  background: var(--code-bg);
  padding: 1rem 1.1rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0 0 1.3rem;
  border: 1px solid var(--line);
}

.content pre code {
  background: none;
  padding: 0;
  font-size: 0.84rem;
  line-height: 1.65;
}

.content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 0.4rem 0 1.3rem;
}

.content hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.4rem 0;
}

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.4rem;
  font-size: 0.92rem;
}

.content th, .content td {
  border-bottom: 1px solid var(--line);
  padding: 0.55rem 0.7rem;
  text-align: left;
}

.content th { color: var(--ink-faint); font-weight: 600; }

/* ---------- 页脚 ---------- */
footer.site-foot {
  border-top: 1px solid var(--line);
  padding: 1.8rem 0 3rem;
  color: var(--ink-faint);
  font-size: 0.85rem;
}

footer.site-foot .wrap {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.2rem;
  flex-wrap: wrap;
}

footer.site-foot a { color: var(--ink-faint); }

.back {
  display: inline-block;
  margin-bottom: 1.6rem;
  font-size: 0.88rem;
  color: var(--ink-faint);
  text-decoration: none;
}

.back:hover { color: var(--accent); }

@media (max-width: 520px) {
  body { font-size: 16px; }
  .site-head { padding-top: 2.2rem; }
  article.post h1 { font-size: 1.45rem; }
}