/* style.css - 清新简约博客样式 */
:root {
  --bg: #fafaf7;
  --fg: #2a2a2a;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --border: #e5e7eb;
  --code-bg: #f3f4f6;
  --max-width: 1100px;
  --toc-width: 260px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: "JetBrains Mono", Menlo, Consolas, monospace;
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 4px;
  font-size: 0.92em;
}
pre code {
  display: block;
  padding: 1em;
  overflow-x: auto;
  line-height: 1.5;
}

/* Header */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .brand {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--fg);
}
.site-header .brand:hover { text-decoration: none; color: var(--accent); }
.site-header nav a {
  margin-left: 1.2rem;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 1.5rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.hero h1 { margin: 0 0 0.5rem; font-size: 2rem; }
.subtitle { color: var(--muted); margin: 0; }

/* Post list */
.post-list h2 {
  font-size: 1.3rem;
  margin: 0 0 1rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.posts { list-style: none; padding: 0; margin: 0; display: grid; gap: 1rem; }
.post-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  transition: box-shadow 0.2s, transform 0.2s;
}
.post-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.post-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--fg);
}
.post-title:hover { color: var(--accent); text-decoration: none; }
.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.5rem 0;
  font-size: 0.85rem;
  color: var(--muted);
}
.tag {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  margin-right: 0.3rem;
}
.excerpt { color: var(--muted); margin: 0.5rem 0 0; font-size: 0.95rem; }

.empty {
  background: #fff;
  border: 1px dashed var(--border);
  padding: 1.5rem;
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
}

/* Article layout */
.post-header { margin-bottom: 1.5rem; }
.post-title-main { font-size: 2rem; margin: 0 0 0.5rem; }

.post-layout {
  display: grid;
  grid-template-columns: var(--toc-width) 1fr;
  gap: 2rem;
  align-items: start;
}
@media (max-width: 900px) {
  .post-layout { grid-template-columns: 1fr; }
  .toc { position: static !important; }
}

/* TOC */
.toc {
  position: sticky;
  top: 5rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
  font-size: 0.9rem;
}
.toc-title {
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.toc-empty { color: var(--muted); font-size: 0.85rem; margin: 0; }
.toc ul { list-style: none; padding-left: 0; margin: 0; }
.toc ul ul { padding-left: 1rem; }
.toc li { margin: 0.25rem 0; }
.toc a {
  color: var(--fg);
  display: block;
  padding: 0.2rem 0;
  border-left: 2px solid transparent;
  padding-left: 0.5rem;
  margin-left: -0.5rem;
  line-height: 1.4;
}
.toc a:hover {
  color: var(--accent);
  border-left-color: var(--accent);
  text-decoration: none;
}
.toc-h2 > a { font-weight: 600; }

/* Markdown body */
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
  margin-top: 1.8em;
  margin-bottom: 0.6em;
  font-weight: 700;
  scroll-margin-top: 5rem;
}
.markdown-body h1 { font-size: 1.8rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
.markdown-body h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
.markdown-body h3 { font-size: 1.25rem; }
.markdown-body h4 { font-size: 1.1rem; color: var(--muted); }
.markdown-body h5 { font-size: 1rem; }
.markdown-body h6 { font-size: 0.9rem; color: var(--muted); }
.markdown-body p { margin: 0.8em 0; }
.markdown-body ul, .markdown-body ol { padding-left: 1.5rem; }
.markdown-body blockquote {
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  padding: 0.5rem 1rem;
  margin: 1em 0;
  color: var(--fg);
}
.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 0.5em 0.8em;
}
.markdown-body th { background: var(--code-bg); }
.markdown-body img { max-width: 100%; height: auto; border-radius: 4px; }
.markdown-body .header-anchor {
  color: var(--muted);
  text-decoration: none;
  margin-right: 0.3em;
  opacity: 0;
  transition: opacity 0.2s;
}
.markdown-body h1:hover .header-anchor,
.markdown-body h2:hover .header-anchor,
.markdown-body h3:hover .header-anchor,
.markdown-body h4:hover .header-anchor,
.markdown-body h5:hover .header-anchor,
.markdown-body h6:hover .header-anchor { opacity: 1; }

/* Footer */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

.post-nav { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--border); }
.empty-state { text-align: center; padding: 4rem 1rem; }
.empty-state h1 { font-size: 4rem; margin: 0; color: var(--accent); }