:root {
  --vermilion: #b33b1a;
  --vermilion-deep: #8a2c12;
  --vermilion-soft: rgba(179, 59, 26, 0.12);
  --ink: #1a1512;
  --ink-soft: #3a322c;
  --paper: #f4efe6;
  --paper-deep: #e8e0d2;
  --paper-card: #faf7f1;
  --gold: #9a7b4f;
  --gold-light: #c4a574;
  --muted: #6b5e52;
  --line: rgba(26, 21, 18, 0.12);
  --shadow: 0 8px 28px rgba(26, 21, 18, 0.08);
  --font-song: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
  --font-ui: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, BlinkMacSystemSystem, sans-serif;
  --max: 720px;
  --wide: 980px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(ellipse at top, #faf6ee 0%, var(--paper) 55%, var(--paper-deep) 100%);
  font-family: var(--font-ui);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--vermilion-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--vermilion); }
img { max-width: 100%; height: auto; }
.wrap { width: min(100% - 2rem, var(--wide)); margin-inline: auto; }
.wrap-narrow { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(10px);
  background: rgba(244, 239, 230, 0.92);
  border-bottom: 1px solid var(--line);
}
.site-header .inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.85rem 0;
}
.brand {
  display: flex; align-items: baseline; gap: 0.55rem;
  color: inherit; text-decoration: none;
}
.brand-mark {
  font-family: var(--font-song);
  font-size: 1.35rem; font-weight: 700;
  color: var(--vermilion);
  letter-spacing: 0.08em;
}
.brand-sub {
  font-size: 0.82rem; color: var(--muted);
  letter-spacing: 0.18em;
}
.nav { display: flex; gap: 1.1rem; flex-wrap: wrap; }
.nav a {
  color: var(--ink-soft); text-decoration: none;
  font-size: 0.92rem; letter-spacing: 0.06em;
}
.nav a:hover { color: var(--vermilion); }

.hero {
  padding: 2.6rem 0 1.6rem;
  border-bottom: 1px solid var(--line);
}
.hero-kicker {
  display: inline-block;
  color: var(--vermilion);
  font-family: var(--font-song);
  letter-spacing: 0.28em;
  font-size: 0.85rem;
  margin-bottom: 0.6rem;
}
.hero h1 {
  margin: 0 0 0.7rem;
  font-family: var(--font-song);
  font-size: clamp(1.7rem, 3.5vw, 2.35rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.35;
}
.hero p {
  margin: 0;
  max-width: 38em;
  color: var(--muted);
  font-size: 1.02rem;
}

.section { padding: 2rem 0 2.8rem; }
.section-title {
  font-family: var(--font-song);
  font-size: 1.25rem;
  letter-spacing: 0.12em;
  margin: 0 0 1.2rem;
  display: flex; align-items: center; gap: 0.7rem;
}
.section-title::before {
  content: "";
  width: 0.45rem; height: 1.05rem;
  background: var(--vermilion);
  border-radius: 1px;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.1rem;
}
.post-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.15rem 1.2rem 1.25rem;
  box-shadow: var(--shadow);
  transition: border-color .2s, transform .2s;
  text-decoration: none;
  color: inherit;
  display: flex; flex-direction: column; gap: 0.55rem;
}
.post-card:hover {
  border-color: rgba(179, 59, 26, 0.35);
  transform: translateY(-2px);
  color: inherit;
}
.post-card .meta {
  font-size: 0.78rem; color: var(--muted);
  letter-spacing: 0.04em;
}
.post-card h2 {
  margin: 0;
  font-family: var(--font-song);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  line-height: 1.45;
}
.post-card .excerpt {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  flex: 1;
}
.post-card .more {
  font-size: 0.85rem; color: var(--vermilion);
  letter-spacing: 0.08em;
}

.article-header {
  padding: 2.2rem 0 1.2rem;
  border-bottom: 1px solid var(--line);
}
.article-header .meta {
  color: var(--muted); font-size: 0.88rem; margin-bottom: 0.7rem;
}
.article-header h1 {
  margin: 0 0 0.8rem;
  font-family: var(--font-song);
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  letter-spacing: 0.06em;
  line-height: 1.4;
}
.article-header .desc {
  margin: 0; color: var(--ink-soft); font-size: 1.02rem;
}

.prose {
  padding: 1.6rem 0 2.4rem;
  font-size: 1.04rem;
}
.prose h2 {
  font-family: var(--font-song);
  font-size: 1.28rem;
  letter-spacing: 0.06em;
  margin: 2rem 0 0.8rem;
  padding-left: 0.7rem;
  border-left: 3px solid var(--vermilion);
}
.prose h3 {
  font-family: var(--font-song);
  font-size: 1.08rem;
  margin: 1.5rem 0 0.55rem;
  color: var(--ink-soft);
}
.prose p { margin: 0.85rem 0; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin: 0.35rem 0; }
.prose blockquote {
  margin: 1.2rem 0;
  padding: 0.85rem 1rem;
  background: var(--vermilion-soft);
  border-left: 3px solid var(--vermilion);
  color: var(--ink-soft);
}
.prose code {
  font-size: 0.92em;
  background: var(--paper-deep);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
.faq {
  margin: 1.6rem 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: var(--paper-card);
}
.faq summary {
  cursor: pointer;
  padding: 0.9rem 1rem;
  font-weight: 600;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "问";
  display: inline-block;
  width: 1.4rem; height: 1.4rem;
  margin-right: 0.55rem;
  text-align: center; line-height: 1.4rem;
  font-size: 0.78rem;
  color: #fff;
  background: var(--vermilion);
  border-radius: 3px;
  vertical-align: middle;
}
.faq[open] summary { border-bottom: 1px solid var(--line); }
.faq .answer {
  padding: 0.9rem 1rem 1.05rem;
  color: var(--ink-soft);
}
.faq .answer::before {
  content: "答";
  display: inline-block;
  width: 1.4rem; height: 1.4rem;
  margin-right: 0.55rem;
  text-align: center; line-height: 1.4rem;
  font-size: 0.78rem;
  color: var(--vermilion);
  border: 1px solid var(--vermilion);
  border-radius: 3px;
  vertical-align: middle;
}

.related {
  margin-top: 2rem;
  padding-top: 1.4rem;
  border-top: 1px dashed var(--line);
}
.related h2 {
  font-family: var(--font-song);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  margin: 0 0 0.8rem;
  border: 0; padding: 0;
}
.related ul { margin: 0; padding-left: 1.1rem; }

.cta-bar {
  margin: 1.8rem 0 0;
  padding: 1.1rem 1.2rem;
  background: linear-gradient(135deg, rgba(179,59,26,0.08), rgba(154,123,79,0.1));
  border: 1px solid rgba(179,59,26,0.18);
  border-radius: 10px;
}
.cta-bar p { margin: 0 0 0.55rem; color: var(--ink-soft); }
.cta-bar a {
  font-family: var(--font-song);
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--vermilion);
  font-weight: 600;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.6rem 0 2.2rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.site-footer .inner {
  display: flex; flex-wrap: wrap; gap: 0.8rem 1.5rem;
  justify-content: space-between; align-items: center;
}
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--vermilion); }

.breadcrumb {
  font-size: 0.85rem; color: var(--muted);
  margin-bottom: 0.9rem;
}
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--vermilion); }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.12rem 0.45rem;
  border: 1px solid rgba(179,59,26,0.28);
  color: var(--vermilion-deep);
  border-radius: 999px;
  margin-right: 0.35rem;
  letter-spacing: 0.04em;
}

@media (max-width: 640px) {
  .brand-sub { display: none; }
  .hero { padding-top: 1.8rem; }
  .post-grid { grid-template-columns: 1fr; }
}