:root {
  --bg: #f6f6f4;
  --panel: #ffffff;
  --text: #202122;
  --muted: #54595d;
  --link: #0645ad;
  --link-visited: #0b0080;
  --link-new: #b32424;
  --border: #a2a9b1;
  --border-soft: #eaecf0;
  --accent: #3366cc;
  --accent-soft: #eaf3ff;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); }
body {
  font-family: -apple-system, "Segoe UI", "Helvetica Neue", Arial, "Liberation Sans", sans-serif;
  font-size: 14.5px;
  line-height: 1.55;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
a:visited { color: var(--link-visited); }
a.new { color: var(--link-new); }

.topbar {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
}
.brand:hover { text-decoration: none; }
.brand:visited { color: inherit; }
.logo {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #8fb3ff, #3366cc);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-family: Georgia, serif;
  font-size: 20px;
}
.brand-text strong { display: block; font-size: 20px; font-family: Georgia, "Times New Roman", serif; }
.brand-text em { display: block; font-style: italic; color: var(--muted); font-size: 11px; }

.search {
  flex: 1;
  display: flex;
  max-width: 520px;
  margin: 0 auto;
}
.search input {
  flex: 1;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-right: none;
  border-radius: 2px 0 0 2px;
  font-size: 14px;
}
.search button {
  padding: 7px 14px;
  border: 1px solid var(--border);
  background: #f8f9fa;
  cursor: pointer;
  border-radius: 0 2px 2px 0;
  font-size: 14px;
}
.search button:hover { background: #eaecf0; }

.user-nav { display: flex; align-items: center; gap: 10px; }
.user-nav .avatar {
  width: 28px; height: 28px; border-radius: 50%; vertical-align: middle;
}
.user-nav button, .user-nav a.btn {
  padding: 6px 12px;
  border: 1px solid var(--border);
  background: #f8f9fa;
  border-radius: 2px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
}
.user-nav button:hover, .user-nav a.btn:hover { background: #eaecf0; text-decoration: none; }
.user-nav .user-name { color: var(--muted); font-size: 13px; }

.layout {
  max-width: 1200px;
  margin: 16px auto;
  padding: 0 16px;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
}
.sidebar {
  background: var(--panel);
  border: 1px solid var(--border-soft);
  padding: 12px;
  font-size: 13px;
  height: fit-content;
  position: sticky;
  top: 80px;
}
.sidebar h3 {
  font-size: 13px;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 4px;
  margin: 12px 0 6px;
}
.sidebar h3:first-child { margin-top: 0; }
.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar li { padding: 3px 0; }

.content {
  background: var(--panel);
  border: 1px solid var(--border-soft);
  padding: 22px 28px 40px;
  min-height: 60vh;
}

.content h1.page-title {
  font-family: "Linux Libertine", Georgia, "Times New Roman", serif;
  font-size: 2.1em;
  font-weight: 400;
  margin: 0 0 4px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-soft);
}
.content .page-meta {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 16px;
}
.content .page-tabs {
  display: flex;
  gap: 2px;
  margin: -22px -28px 18px;
  padding: 0 28px;
  border-bottom: 1px solid var(--border-soft);
  background: #fbfbfa;
}
.content .page-tabs a {
  padding: 8px 14px;
  border: 1px solid transparent;
  border-bottom: none;
  font-size: 13px;
  color: var(--link);
}
.content .page-tabs a.active {
  background: var(--panel);
  border-color: var(--border-soft);
  border-bottom-color: var(--panel);
  color: var(--text);
  margin-bottom: -1px;
}

.markdown { font-size: 15px; }
.markdown h1, .markdown h2 {
  font-family: "Linux Libertine", Georgia, serif;
  font-weight: 400;
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 4px;
  margin-top: 1.2em;
}
.markdown h1 { font-size: 1.8em; }
.markdown h2 { font-size: 1.5em; }
.markdown h3 { font-size: 1.2em; margin-top: 1em; }
.markdown p { margin: 0.6em 0; }
.markdown ul, .markdown ol { padding-left: 1.6em; }
.markdown code {
  background: #f6f8fa;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.92em;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
.markdown pre {
  background: #f6f8fa;
  padding: 10px 12px;
  border-radius: 4px;
  overflow-x: auto;
}
.markdown pre code { background: none; padding: 0; }
.markdown blockquote {
  border-left: 4px solid var(--border-soft);
  padding: 2px 12px;
  color: var(--muted);
  margin: 0.8em 0;
}
.markdown table {
  border-collapse: collapse;
  margin: 1em 0;
}
.markdown th, .markdown td {
  border: 1px solid var(--border);
  padding: 6px 10px;
}
.markdown th { background: #eaecf0; }
.markdown img { max-width: 100%; height: auto; }

.editor {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.editor .field { margin-bottom: 12px; }
.editor label { display: block; font-weight: 600; font-size: 13px; margin-bottom: 4px; }
.editor input[type="text"], .editor textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 2px;
  font-size: 14px;
  font-family: inherit;
}
.editor textarea {
  min-height: 420px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
}
.editor .preview {
  border: 1px solid var(--border-soft);
  padding: 14px;
  background: #fafafa;
  min-height: 420px;
  overflow: auto;
}
.editor .preview h4 { margin: 0 0 10px; color: var(--muted); font-size: 12px; text-transform: uppercase; }
.editor .actions { grid-column: 1 / -1; display: flex; gap: 8px; }
.btn-primary {
  padding: 8px 18px;
  background: #3366cc;
  color: white;
  border: 1px solid #2a4b8d;
  border-radius: 2px;
  cursor: pointer;
  font-size: 14px;
}
.btn-primary:hover { background: #2a4b8d; }
.btn-secondary {
  padding: 8px 18px;
  background: #f8f9fa;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 2px;
  cursor: pointer;
  font-size: 14px;
  text-decoration: none;
  display: inline-block;
}
.btn-secondary:hover { background: #eaecf0; }

.banner {
  padding: 10px 14px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  margin-bottom: 16px;
  font-size: 14px;
}
.banner.error { background: #fee; border-color: #b32424; }

.page-list { padding: 0; list-style: none; }
.page-list li {
  padding: 8px 0;
  border-bottom: 1px dotted var(--border-soft);
}
.page-list .slug { color: var(--muted); font-size: 12px; margin-left: 6px; }

.featured {
  background: linear-gradient(135deg, #eaf3ff 0%, #fff 70%);
  border: 1px solid #c8dcf5;
  padding: 18px 22px;
  margin-bottom: 20px;
}
.featured h2 { margin-top: 0; border: none; }

.footer {
  max-width: 1200px;
  margin: 30px auto;
  padding: 12px 16px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  border-top: 1px solid var(--border-soft);
}

.loader { color: var(--muted); font-style: italic; padding: 20px 0; }

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .editor { grid-template-columns: 1fr; }
  .search { max-width: none; }
  .brand-text em { display: none; }
}