:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev2: #21262d;
  --border: #30363d;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --danger: #f85149;
  --green: #3fb950;
  --radius: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header bar */
.bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
}
.logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
}
.crumb {
  color: var(--text-muted);
  font-size: 0.9rem;
  flex: 1;
}
.bar .btn { flex: 0; }

.bar-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}
.filename-input {
  padding: 4px 10px;
  background: var(--bg-elev2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-size: 0.8rem;
  font-family: monospace;
  width: 200px;
}
.filename-input:focus { outline: none; border-color: var(--accent); }

.actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.actions-cell {
  display: flex;
  gap: 4px;
  align-items: center;
}

.btn-icon {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: none;
  background: none;
  cursor: pointer;
  opacity: 0.4;
  color: var(--text-muted);
  font-size: 0.75rem;
}
.btn-icon:hover { opacity: 1; color: var(--accent); }
.btn-icon::before { content: "\270E"; }

/* Editor */
.editor-body { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }
.editor-main {
  flex: 1;
  display: flex;
  overflow: hidden;
}
.editor-pane {
  flex: 1;
  border-right: 1px solid var(--border);
  overflow: hidden;
}
.editor-pane textarea {
  width: 100%;
  height: 100%;
  resize: none;
  border: none;
  outline: none;
  background: var(--bg);
  color: var(--text);
  padding: 24px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}
.preview-pane {
  flex: 1;
  overflow-y: auto;
}
.preview-pane .markdown-body {
  max-width: none;
  padding: 32px 24px;
}

/* Container */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px;
}

.row-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}
h1 { font-size: 1.5rem; font-weight: 600; }

/* Buttons */
.btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elev2);
  color: var(--text);
  cursor: pointer;
  font-size: 0.875rem;
  transition: 0.15s;
}
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { opacity: 0.9; }
.btn-danger { color: var(--danger); border-color: var(--border); }
.btn-danger:hover { border-color: var(--danger); background: rgba(248,81,73,0.1); }
.btn-sm { padding: 4px 10px; font-size: 0.8rem; }
.btn-link {
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
}
.hidden { display: none !important; }

.inline-form {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}
.inline-form input {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.9rem;
}
.inline-form input:focus { outline: none; border-color: var(--accent); }

/* Folder grid */
.folder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.folder-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: 0.15s;
  color: var(--text);
}
.folder-card:hover {
  border-color: var(--accent);
  text-decoration: none;
}
.folder-icon { font-size: 1.8rem; }
.folder-name { font-weight: 600; font-size: 0.95rem; }
.folder-meta { color: var(--text-muted); font-size: 0.8rem; }

/* Empty state */
.empty {
  color: var(--text-muted);
  text-align: center;
  padding: 48px 0;
  font-size: 0.95rem;
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  margin-bottom: 32px;
  transition: 0.15s;
  cursor: pointer;
}
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(88,166,255,0.05);
}
.dropzone.uploading {
  border-color: var(--green);
  opacity: 0.7;
}
.dropzone.shake { border-color: var(--danger); }
.dropzone p { color: var(--text-muted); margin-bottom: 8px; }
.dropzone .hint { font-size: 0.85rem; }

/* File table */
.file-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.file-table th {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.8rem;
}
.file-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.file-table tr:hover { background: var(--bg-elev); }
.share-url {
  width: 220px;
  padding: 4px 8px;
  background: var(--bg-elev2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: monospace;
}

/* PDF view */
.doc-view { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }
.pdf-container { flex: 1; overflow: hidden; }
.pdf-container embed { border: none; }

/* Markdown view */
.md-container {
  flex: 1;
  overflow-y: auto;
  padding: 0;
}
.markdown-body {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 24px 120px;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
}

/* Markdown elements */
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
  margin-top: 28px;
  margin-bottom: 12px;
  font-weight: 600;
  line-height: 1.25;
}
.markdown-body h1 { font-size: 1.8rem; border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.markdown-body h2 { font-size: 1.4rem; border-bottom: 1px solid var(--border); padding-bottom: 6px; }
.markdown-body h3 { font-size: 1.2rem; }
.markdown-body h4 { font-size: 1rem; }
.markdown-body p { margin-bottom: 12px; }
.markdown-body ul, .markdown-body ol { margin-bottom: 12px; padding-left: 28px; }
.markdown-body li { margin-bottom: 4px; }
.markdown-body blockquote {
  padding: 8px 16px;
  border-left: 4px solid var(--accent);
  background: var(--bg-elev);
  margin-bottom: 12px;
  color: var(--text-muted);
}
.markdown-body table {
  display: block;
  overflow: auto;
  border-collapse: collapse;
  margin-bottom: 16px;
  width: 100%;
}
.markdown-body th, .markdown-body td {
  padding: 8px 12px;
  border: 1px solid var(--border);
}
.markdown-body th { background: var(--bg-elev); font-weight: 600; }
.markdown-body tr:nth-child(even) { background: var(--bg-elev); }
.markdown-body img { max-width: 100%; border-radius: var(--radius); }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }

/* Code blocks */
.markdown-body pre {
  padding: 16px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin-bottom: 16px;
  background: #0d1117 !important;
  border: 1px solid var(--border);
}
.markdown-body code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.875rem;
}
.markdown-body :not(pre) > code {
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-elev2);
  font-size: 0.85em;
}

/* Mermaid */
.markdown-body .mermaid {
  display: flex;
  justify-content: center;
  padding: 24px;
  margin-bottom: 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* Footnotes */
.markdown-body .footnote { font-size: 0.85rem; color: var(--text-muted); }
.markdown-body .footnotes-sep { margin: 24px 0; border-top: 1px solid var(--border); }

/* Task lists */
.markdown-body input[type="checkbox"] { margin-right: 6px; }

/* Anchors */
.markdown-body .header-anchor { color: var(--text-muted); text-decoration: none; margin-left: 8px; }
.markdown-body .header-anchor:hover { color: var(--accent); }