/* 小蛋AI 博客 · 静态页共享样式(与主站视觉一致:纸白底 + 琥珀主色) */
:root {
  --paper: #faf9f7;
  --paper-warm: #f5f2ec;
  --surface: #ffffff;
  --ink: #1c1917;
  --text-secondary: #57534e;
  --text-muted: #a8a29e;
  --border: #e7e2da;
  --border-strong: #d6cfc4;
  --yolk: #f59e0b;
  --yolk-deep: #d97706;
  --yolk-soft: #fef3c7;
  --radius: 14px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 3px rgba(28, 25, 23, 0.06);
  --shadow-md: 0 6px 24px rgba(28, 25, 23, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.85;
  font-size: 16px;
}

a { color: var(--yolk-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* ---------- 顶栏 ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(250, 249, 247, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}
.nav-brand:hover { text-decoration: none; }
.nav-brand svg { flex-shrink: 0; }
.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14.5px;
}
.nav-links a { color: var(--text-secondary); font-weight: 500; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-cta {
  background: var(--ink);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  transition: opacity 0.2s;
}
.nav-cta:hover { opacity: 0.85; text-decoration: none; }

/* ---------- 列表页 ---------- */
.blog-hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 24px 8px;
}
.blog-hero h1 {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}
.blog-hero h1 em {
  font-style: normal;
  background: linear-gradient(transparent 62%, var(--yolk-soft) 62%);
}
.blog-hero p { color: var(--text-secondary); max-width: 640px; }

.post-grid {
  max-width: 1080px;
  margin: 0 auto;
  padding: 36px 24px 72px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.post-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}
.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}
.post-card img { aspect-ratio: 16/9; object-fit: cover; }
.post-card-body { padding: 18px 20px 22px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.post-card h2 { font-size: 16.5px; line-height: 1.5; color: var(--ink); }
.post-card p { font-size: 13.5px; color: var(--text-secondary); line-height: 1.7; }
.post-card time { margin-top: auto; font-size: 12px; color: var(--text-muted); }

/* ---------- 文章页 ---------- */
.article-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 72px;
}
.article-wrap .crumb {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.article-wrap h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.article-meta {
  display: flex;
  gap: 14px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 26px;
}
.article-cover {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 36px;
}
.article-body h2 {
  font-size: 1.35rem;
  margin: 44px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--yolk);
  line-height: 1.5;
}
.article-body h3 {
  font-size: 1.1rem;
  margin: 30px 0 12px;
}
.article-body p { margin: 0 0 18px; color: #38332f; }
.article-body ul, .article-body ol { margin: 0 0 18px 1.4em; color: #38332f; }
.article-body li { margin-bottom: 8px; }
.article-body strong { color: var(--ink); }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 22px;
  font-size: 14.5px;
  background: var(--surface);
}
.article-body th, .article-body td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.article-body th {
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-weight: 600;
}
.article-body blockquote {
  border-left: 3px solid var(--border-strong);
  padding: 4px 0 4px 18px;
  color: var(--text-secondary);
  margin: 0 0 18px;
  font-size: 15px;
}

/* FAQ */
.faq { margin: 8px 0 22px; }
.faq details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 10px;
}
.faq summary { font-weight: 600; cursor: pointer; }
.faq details p { margin: 10px 0 2px; font-size: 15px; }

/* CTA 卡片 */
.cta-card {
  margin: 40px 0 8px;
  background: linear-gradient(135deg, #fffbf2, #fef3c7);
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  padding: 26px 28px;
}
.cta-card h2 { font-size: 1.2rem; margin-bottom: 8px; border: none; padding: 0; }
.cta-card p { font-size: 14.5px; color: var(--text-secondary); margin-bottom: 16px; }
.cta-card a {
  display: inline-block;
  background: var(--ink);
  color: #fff;
  padding: 10px 26px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 14.5px;
}
.cta-card a:hover { opacity: 0.85; text-decoration: none; }

/* 学术诚信提示 */
.integrity-note {
  margin-top: 34px;
  padding: 16px 18px;
  background: var(--paper-warm);
  border: 1px dashed var(--border-strong);
  border-radius: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 相关阅读 */
.related { margin-top: 40px; }
.related h2 { font-size: 1.1rem; margin-bottom: 14px; }
.related ul { list-style: none; }
.related li { margin-bottom: 10px; font-size: 15px; }
.related li::before { content: "→ "; color: var(--yolk-deep); }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--paper-warm);
}
.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  font-size: 13px;
  color: var(--text-secondary);
}
.footer-inner .foot-brand { font-weight: 700; color: var(--ink); font-size: 14px; }
.footer-inner a { color: var(--text-secondary); }
.footer-copy { margin-left: auto; color: var(--text-muted); font-size: 12px; }

@media (max-width: 900px) {
  .post-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .post-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 12px; font-size: 13.5px; }
  .footer-copy { margin-left: 0; }
}