:root {
  --bg: #faf8f5;
  --bg-soft: #f3efe9;
  --ink: #2d3130;
  --ink-soft: #5c6260;
  --clay: #b85c48;
  --teal: #3c525c;
  --line: #e6e0d8;
  --max-width: 44rem;
  --font-serif: "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
body { margin: 0; }
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
}
h1 { font-size: 1.9rem; margin: 0 0 0.5rem; }
h2 {
  font-size: 1.35rem;
  margin: 2.5rem 0 1rem;
  padding-left: 0.75rem;
  border-left: 4px solid var(--accent, var(--clay));
}
h3 { font-size: 1.1rem; margin: 2rem 0 0.75rem; }
p { margin: 0 0 1.25rem; }
a {
  color: var(--accent, var(--clay));
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
a:hover { border-bottom-color: currentColor; }
blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 3px solid var(--line);
  color: var(--ink-soft);
  font-style: normal;
}
code {
  background: var(--bg-soft);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
}
pre {
  background: var(--bg-soft);
  padding: 1rem 1.25rem;
  border-radius: 8px;
  overflow-x: auto;
  line-height: 1.6;
}
pre code { background: none; padding: 0; }
hr { border: none; border-top: 1px solid var(--line); margin: 3rem 0; }

/* Header */
.site-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}
.site-logo {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.site-logo em { font-style: normal; color: var(--clay); }
.site-nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.site-nav a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  border: none;
  padding-bottom: 2px;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom: 2px solid var(--accent, var(--clay));
}

/* Footer */
.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  text-align: center;
}
.site-footer .tagline-1 { margin: 0 0 0.35rem; color: var(--ink); }
.site-footer .tagline-2 {
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  letter-spacing: 0.06em;
}
.site-footer .copyright { font-size: 0.78rem; margin: 0; }

/* Themes */
[data-theme="human"] { --accent: var(--clay); }
[data-theme="tech"]  { --accent: var(--teal); }

/* Home page */
.home-stage {
  min-height: 62vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}
.home-stage svg { width: min(64vw, 360px); height: auto; cursor: pointer; }
.home-hint {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0;
}
.home-hint em { font-style: normal; color: var(--clay); }

/* Section hero */
.hero { padding: 2rem 0 1rem; }
.hero .tagline { font-size: 1.05rem; color: var(--ink-soft); margin-top: 0.25rem; }

/* Category cards */
.section-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
  margin: 2.5rem 0;
  padding: 0;
  list-style: none;
}
.section-cards .card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.25rem 1.4rem;
  background: #fff;
  transition: transform 0.15s, box-shadow 0.15s;
}
.section-cards .card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(45, 49, 48, 0.06);
}
.section-cards .card a { border: none; display: block; }
.section-cards .card h3 {
  margin: 0 0 0.35rem;
  padding-left: 0.6rem;
  border-left: 4px solid var(--accent, var(--clay));
  color: var(--ink);
}
.section-cards .card p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

/* Article list */
.post-list { list-style: none; padding: 0; margin: 2rem 0; }
.post-list li {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}
.post-list .title { font-family: var(--font-serif); font-size: 1.05rem; }
.post-list time { font-size: 0.82rem; color: var(--ink-soft); white-space: nowrap; }

/* Article */
.post-meta { font-size: 0.85rem; color: var(--ink-soft); margin-bottom: 2.5rem; }
.prose { font-size: 1rem; }

/* Category breadcrumb */
.category-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 0.25rem;
}
.category-tag {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 0.8rem;
  padding: 0.2em 0.6em;
  border-radius: 4px;
  background: var(--bg-soft);
  color: var(--ink-soft);
  border: none;
  margin-left: 0.5rem;
}
.empty-state {
  color: var(--ink-soft);
  font-size: 0.95rem;
  padding: 2rem 0;
  text-align: center;
}

@media (max-width: 600px) {
  html { font-size: 16px; }
  .site-header { flex-direction: column; }
}