:root {
  --bg: #fdfdfc;
  --fg: #1c1c1a;
  --fg-soft: #3a3a36;
  --muted: #7a7a72;
  --link: #1a4f9c;
  --link-hover: #0d3a7d;
  --rule: #e8e8e2;
  --code-bg: #f4f4ef;
  --mark-bg: #fff3bf;
  --maxw: 46rem;
}

[data-theme="dark"] {
  --bg: #121211;
  --fg: #deded8;
  --fg-soft: #c5c5be;
  --muted: #8f8f86;
  --link: #8ab4f8;
  --link-hover: #aecbfa;
  --rule: #2c2c29;
  --code-bg: #1d1d1b;
  --mark-bg: #4d431b;
}

* { box-sizing: border-box; }

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: Georgia, "Times New Roman", "Songti SC", "Noto Serif SC", "SimSun", serif;
  line-height: 1.85;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  color: var(--link-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- header ---------- */

.site-header {
  border-bottom: 1px solid var(--rule);
  padding: 1.1rem 0;
  margin-bottom: 2.5rem;
}

.header-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: 0.01em;
}
.site-title:hover { color: var(--fg); text-decoration: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-size: 0.86rem;
}
.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--fg); text-decoration: none; }
.site-nav a.active { color: var(--fg); font-weight: 600; }

.theme-toggle {
  border: none;
  background: none;
  color: var(--muted);
  cursor: pointer;
  padding: 0.2rem;
  display: inline-flex;
  align-items: center;
}
.theme-toggle:hover { color: var(--fg); }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }

/* ---------- home ---------- */

.home-intro p { margin: 0 0 1rem; font-size: 1.05rem; }

.home-section { margin-top: 2.75rem; }

.section-title {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-weight: 600;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.45rem;
  margin: 0 0 1.1rem;
}

/* ---------- post list ---------- */

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

.post-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
}
.post-item:last-child { border-bottom: none; }

.post-link {
  font-size: 1.12rem;
  font-weight: 600;
  color: var(--fg);
}
.post-link:hover { color: var(--link); }

.post-meta {
  margin-top: 0.25rem;
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: baseline;
}

.tag {
  color: var(--muted);
  font-size: 0.8rem;
}
.tag:hover { color: var(--link); text-decoration: none; }
.tag .count { opacity: 0.6; }

.post-summary {
  margin: 0.45rem 0 0;
  color: var(--fg-soft);
  font-size: 0.95rem;
}

.more-link { margin-top: 1rem; font-size: 0.9rem; }

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  padding: 0.5rem 0;
}

/* ---------- page / article ---------- */

.page-header { margin-bottom: 1.8rem; }
.page-title { font-size: 1.6rem; margin: 0; }
.page-intro { color: var(--muted); font-size: 0.95rem; margin-top: 0.5rem; }

.post-title {
  font-size: 1.75rem;
  line-height: 1.4;
  margin: 0 0 0.6rem;
}

.post-header { margin-bottom: 2rem; }

.post-content { font-size: 1.02rem; }

.post-content h2 {
  font-size: 1.3rem;
  margin: 2.4rem 0 0.9rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--rule);
}
.post-content h3 { font-size: 1.12rem; margin: 1.9rem 0 0.7rem; }

.post-content p { margin: 0 0 1.1rem; }
.post-content ul, .post-content ol { padding-left: 1.5rem; margin: 0 0 1.1rem; }
.post-content li { margin: 0.3rem 0; }

.post-content blockquote {
  margin: 1.2rem 0;
  padding: 0.2rem 1.1rem;
  border-left: 3px solid var(--rule);
  color: var(--muted);
}

.post-content code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.86em;
  background: var(--code-bg);
  padding: 0.12em 0.35em;
  border-radius: 4px;
}

.post-content pre {
  background: var(--code-bg);
  padding: 1rem 1.1rem;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.6;
}
.post-content pre code {
  background: none;
  padding: 0;
  font-size: 0.82rem;
}

.post-content img {
  max-width: 100%;
  border-radius: 6px;
}

.post-content hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2rem 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 1rem 0;
}
.post-content th, .post-content td {
  border: 1px solid var(--rule);
  padding: 0.45rem 0.7rem;
  text-align: left;
}

.post-content mark { background: var(--mark-bg); }

/* TOC */

.toc {
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.7rem 1rem;
  margin: 0 0 1.8rem;
  font-size: 0.88rem;
}
.toc summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.toc nav ul { margin: 0.6rem 0 0; padding-left: 1.2rem; }
.toc ul ul { padding-left: 1.1rem; }
.toc li { margin: 0.2rem 0; }

/* post nav */

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 2.5rem 0 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  font-size: 0.9rem;
}

/* reading progress */

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--link);
  z-index: 100;
  opacity: 0.7;
}

/* ---------- archive ---------- */

.archive-year { margin-bottom: 2rem; }
.archive-year h2 { font-size: 1.1rem; margin: 0 0 0.6rem; }
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-list li {
  display: flex;
  gap: 0.8rem;
  padding: 0.28rem 0;
  font-size: 0.95rem;
}
.archive-list time {
  color: var(--muted);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  padding-top: 0.18rem;
  min-width: 3rem;
}

/* ---------- search ---------- */

.search-box input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  outline: none;
}
.search-box input:focus { border-color: var(--link); }

.search-hint { color: var(--muted); font-size: 0.9rem; }

.search-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
}
.search-item h3 { margin: 0; font-size: 1.05rem; }
.search-item p { margin: 0.3rem 0 0; font-size: 0.9rem; color: var(--fg-soft); }

/* ---------- comments ---------- */

.comments {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

/* ---------- footer ---------- */

.site-footer {
  margin-top: 4rem;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.82rem;
  color: var(--muted);
}
.footer-inner p { margin: 0.2rem 0; }

/* ---------- misc ---------- */

::selection { background: var(--link); color: #fff; }

@media (max-width: 560px) {
  html { font-size: 16px; }
  .post-title { font-size: 1.45rem; }
  .header-inner { gap: 0.5rem; }
  .site-nav { gap: 0.8rem; }
}