/* ============ base ============ */
:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #0a7d0a;
  --border: #dcdcdc;
  --code-bg: #f0f0f0;
  --sidebar-bg: #1e1e1e;
  --sidebar-fg: #cfcfcf;
  --sidebar-hover: #ffffff;
  --sidebar-active: #4ec94e;
}
[data-theme="dark"] {
  --bg: #141516;
  --fg: #d6d6d6;
  --muted: #8a8a8a;
  --accent: #4ec94e;
  --border: #2c2e30;
  --code-bg: #1e2022;
  --sidebar-bg: #0e0f10;
  --sidebar-fg: #a8a8a8;
}
* { box-sizing: border-box; }
html { font-size: 16px; }
body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, pre, .prompt, .site-title { font-family: Consolas, "SF Mono", Menlo, monospace; }

/* ============ layout ============ */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  color: var(--sidebar-fg);
  padding: 32px 20px;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
}
.site-title {
  color: #fff;
  font-size: 1.05rem;
  font-weight: bold;
  letter-spacing: 0.5px;
  margin-bottom: 36px;
  display: block;
}
.site-title:hover { text-decoration: none; color: var(--sidebar-active); }
.prompt { color: var(--sidebar-active); }

#category-nav { flex: 1; }
#category-nav a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  color: var(--sidebar-fg);
  padding: 8px 10px;
  font-size: 0.92rem;
  font-family: Consolas, Menlo, monospace;
  border-left: 2px solid transparent;
}
#category-nav a:hover { color: var(--sidebar-hover); text-decoration: none; }
#category-nav a.active {
  color: var(--sidebar-active);
  border-left-color: var(--sidebar-active);
}
#category-nav .count { font-size: 0.75rem; color: var(--muted); }

.sidebar-footer {
  border-top: 1px solid #333;
  padding-top: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.sidebar-footer .tagline { font-size: 0.72rem; color: #666; font-family: Consolas, monospace; }
#theme-toggle {
  background: none; border: 1px solid #444; color: var(--sidebar-fg);
  width: 28px; height: 28px; border-radius: 4px; cursor: pointer; font-size: 0.85rem;
}
#theme-toggle:hover { color: #fff; border-color: #666; }

.content {
  flex: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 40px 80px;
  min-width: 0;
}

/* ============ list page ============ */
.list-header {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-bottom: 2px solid var(--fg);
  padding-bottom: 10px;
  margin-bottom: 8px;
}
.list-header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-family: Consolas, Menlo, monospace;
}
.post-count { color: var(--muted); font-size: 0.85rem; font-family: Consolas, monospace; }

.article-list { list-style: none; margin: 0; padding: 0; }
.article-list li { border-bottom: 1px solid var(--border); }
.article-list a.item {
  display: block;
  padding: 18px 6px;
  color: inherit;
}
.article-list a.item:hover { text-decoration: none; background: var(--code-bg); }
.article-list .item-title { font-size: 1.12rem; font-weight: 600; }
.article-list a.item:hover .item-title { color: var(--accent); }
.article-list .item-meta {
  font-family: Consolas, Menlo, monospace;
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 4px;
}
.article-list .item-excerpt {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ============ pagination ============ */
.pagination {
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-top: 32px;
  font-family: Consolas, Menlo, monospace;
}
.pagination button {
  background: none;
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 5px 12px;
  cursor: pointer;
  font-size: 0.85rem;
  font-family: inherit;
}
.pagination button:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.pagination button.current { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.pagination button:disabled { opacity: 0.35; cursor: default; }

/* ============ article page ============ */
.back-link {
  font-family: Consolas, Menlo, monospace;
  font-size: 0.85rem;
  display: inline-block;
  margin-bottom: 24px;
}
.article-header { border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 28px; }
.article-header h1 { margin: 0 0 10px; font-size: 1.7rem; line-height: 1.35; }
.article-meta {
  font-family: Consolas, Menlo, monospace;
  font-size: 0.8rem;
  color: var(--muted);
}
.article-meta .sep { margin: 0 6px; }

.article-content h2 { font-size: 1.3rem; margin-top: 2em; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.article-content h3 { font-size: 1.1rem; margin-top: 1.6em; }
.article-content img { max-width: 100%; display: block; margin: 18px auto; border: 1px solid var(--border); }
.article-content pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}
.article-content code { background: var(--code-bg); padding: 1px 5px; font-size: 0.88em; }
.article-content pre code { background: none; padding: 0; }
.article-content blockquote {
  border-left: 3px solid var(--accent);
  margin: 1em 0; padding: 4px 18px;
  color: var(--muted);
}
.article-content table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
.article-content th, .article-content td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }

.article-reference {
  margin-top: 48px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  font-family: Consolas, Menlo, monospace;
  font-size: 0.75rem;
  color: var(--muted);
  word-break: break-all;
}

/* ============ responsive ============ */
@media (max-width: 760px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; padding: 16px; }
  #category-nav { display: flex; flex-wrap: wrap; gap: 2px; }
  #category-nav a { border-left: none; border-bottom: 2px solid transparent; }
  #category-nav a.active { border-left: none; border-bottom-color: var(--sidebar-active); }
  .content { padding: 24px 16px 60px; }
}