:root {
  --bg: #f7f7f5;
  --panel: #ffffff;
  --border: #e3e1db;
  --text: #2b2a27;
  --text-muted: #6f6d66;
  --accent: #b5651d;
  --accent-hover: #9a5217;
  --danger: #b3402e;
  --chip-bg: #f0ece4;
  --radius: 8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0; height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
}

#app {
  display: flex;
  height: 100vh;
}

#sidebar {
  width: 340px;
  min-width: 280px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px;
  overflow-y: auto;
}

.sidebar-header h1 {
  font-size: 16px;
  margin: 0 0 4px 0;
}

.stats {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.search-box { position: relative; margin-bottom: 12px; }

#searchInput {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
}

.search-results {
  position: absolute;
  top: 40px; left: 0; right: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-height: 420px;
  overflow-y: auto;
  z-index: 20;
  box-shadow: 0 6px 18px rgba(0,0,0,.08);
}

.search-result-item {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--bg); }
.search-result-item .sr-title { font-weight: 600; font-size: 13.5px; }
.search-result-item .sr-summary { font-size: 12.5px; color: var(--text-muted); margin-top: 2px; }
.search-result-item .sr-meta { font-size: 11px; color: #a19d92; margin-top: 4px; }

.hidden { display: none !important; }

.btn {
  border: 1px solid var(--border);
  background: var(--panel);
  padding: 7px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13px;
}
.btn:hover { background: var(--bg); }
.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: #fbe9e6; }
.btn-block { width: 100%; margin-bottom: 14px; }

.tree { font-size: 13.5px; flex: 1; }
.tree-node { margin-left: 4px; }
.tree-folder > .tree-label {
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text);
  font-weight: 600;
}
.tree-folder > .tree-label:hover { background: var(--bg); }
.tree-children { margin-left: 14px; border-left: 1px dashed var(--border); padding-left: 8px; }
.tree-article {
  padding: 4px 6px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-muted);
  display: block;
}
.tree-article:hover, .tree-article.active { background: var(--chip-bg); color: var(--text); }
.tree-caret { display: inline-block; width: 10px; transition: transform .15s; }
.tree-folder.collapsed .tree-caret { transform: rotate(-90deg); }
.tree-folder.collapsed > .tree-children { display: none; }

#content {
  flex: 1;
  overflow-y: auto;
  padding: 32px 48px;
  max-width: 900px;
}

.welcome h2 { margin-top: 0; }

.article-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}
.breadcrumb { font-size: 12.5px; color: var(--text-muted); }
.actions { display: flex; gap: 8px; }

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 10px 0 20px 0;
}
.chip {
  background: var(--chip-bg);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--text);
}
.chip.source { background: #eef3f7; color: #3a5d75; }

.markdown-body { line-height: 1.65; font-size: 15.5px; }
.markdown-body h1 { font-size: 26px; }
.markdown-body h2 { font-size: 20px; margin-top: 28px; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.markdown-body h3 { font-size: 16.5px; margin-top: 22px; }
.markdown-body code {
  background: var(--chip-bg);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 90%;
}
.markdown-body pre {
  background: #2b2a27;
  color: #f2f0ea;
  padding: 12px 14px;
  border-radius: var(--radius);
  overflow-x: auto;
}
.markdown-body pre code { background: none; color: inherit; padding: 0; }
.markdown-body blockquote {
  margin: 0;
  padding: 4px 14px;
  border-left: 3px solid var(--accent);
  color: var(--text-muted);
  background: #fbf7f0;
}
.markdown-body table { border-collapse: collapse; width: 100%; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 6px 10px; font-size: 14px; }

.edit-form { display: flex; flex-direction: column; gap: 12px; max-width: 760px; }
.edit-form label { font-size: 12.5px; color: var(--text-muted); font-weight: 600; }
.edit-form input, .edit-form textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
}
.edit-form textarea#f-body { min-height: 380px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13.5px; }
.edit-form .row { display: flex; gap: 12px; }
.edit-form .row > div { flex: 1; }
.edit-actions { display: flex; gap: 10px; margin-top: 4px; }

.empty-tag { color: #a19d92; font-size: 12px; padding: 0 6px; }