:root {
  --bg: #f0f4f8;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --border: #dbe3ef;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --warn-soft: #fffbeb;
  --warn-border: #fcd34d;
  --agents-soft: #f5f3ff;
  --agents-border: #c4b5fd;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  --radius: 10px;
}

* { box-sizing: border-box; }

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

.demo-badge {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 5px 10px;
  border-radius: 8px;
  background: #0f172a;
  color: #f8fafc;
  font-size: 11px;
  font-weight: 600;
}

.demo-back {
  position: fixed;
  top: 10px;
  right: 10px;
  z-index: 200;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  font-size: 12px;
  box-shadow: var(--shadow);
}

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  padding: 10px 16px;
  border-radius: 8px;
  background: #0f172a;
  color: #fff;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 300;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.shell {
  display: grid;
  grid-template-rows: 48px 1fr;
  min-height: 100vh;
}

.shell-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.shell-header h1 { margin: 0; font-size: 16px; }
.shell-header span { font-size: 12px; color: var(--muted); }

.shell-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 0;
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel-soft);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-item {
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--muted);
}

.sidebar-item.active {
  background: var(--accent-soft);
  color: #1e40af;
  font-weight: 600;
}

.workspace {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  background: var(--panel);
  overflow: hidden;
}

.doc-type-switch {
  display: flex;
  gap: 6px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--panel-soft);
}

.doc-type-switch button {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
}

.doc-type-switch button.active {
  border-color: #93c5fd;
  background: var(--accent-soft);
  color: #1e40af;
}

.doc-type-switch button[data-doc-type="agents"].active {
  border-color: var(--agents-border);
  background: var(--agents-soft);
  color: #5b21b6;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  font-size: 12px;
}

.breadcrumb {
  border: none;
  background: none;
  padding: 0;
  color: var(--muted);
  cursor: pointer;
  font-size: inherit;
}

.breadcrumb.current { color: var(--text); font-weight: 600; cursor: default; }
.breadcrumb-sep { color: #cbd5e1; }

.title-zone { min-width: 0; }
.title-zone.hidden { display: none !important; }

.crumb-zone.hidden { display: none !important; }

.title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.title-fixed {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--agents-soft);
  border: 1px solid var(--agents-border);
  font-weight: 700;
  font-size: 15px;
  color: #5b21b6;
}

.title-fixed .lock { opacity: 0.7; font-size: 14px; }

.doc-title-input {
  flex: 1;
  min-width: 120px;
  max-width: 420px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
}

.doc-title-input:disabled {
  background: var(--panel-soft);
  color: var(--muted);
  cursor: not-allowed;
}

.doc-ext { font-size: 13px; color: var(--muted); font-weight: 600; }

.doc-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: auto;
}

.btn {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
}

.btn:hover { background: var(--panel-soft); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: #1d4ed8; }
.btn-danger { color: var(--danger); border-color: #fecaca; background: var(--danger-soft); }
.btn-danger:hover { background: #fecaca; }
.btn-ghost { border-color: transparent; background: transparent; }
.btn-icon { width: 34px; height: 34px; padding: 0; display: inline-flex; align-items: center; justify-content: center; }

.editor-textarea,
.yaml-textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  font-family: ui-monospace, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
  min-height: 200px;
}

.editor-textarea { flex: 1; min-height: 280px; }

.yaml-textarea { min-height: 120px; background: var(--panel-soft); }

.view-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.view-toggle button {
  border: none;
  background: var(--panel);
  padding: 6px 10px;
  font-size: 12px;
  cursor: pointer;
  color: var(--muted);
}

.view-toggle button.active {
  background: var(--accent-soft);
  color: #1e40af;
  font-weight: 600;
}

.sys-banner {
  padding: 8px 14px;
  background: var(--warn-soft);
  border-bottom: 1px solid var(--warn-border);
  font-size: 12px;
  color: #92400e;
}

.spacer { flex: 1; }
.hidden { display: none !important; }

.doc-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: auto;
  padding: 14px 16px;
  gap: 12px;
}

.slab-label {
  margin: 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.preview-pane {
  flex: 1;
  min-height: 240px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-soft);
  overflow: auto;
  line-height: 1.6;
}

.preview-pane h1 { margin-top: 0; font-size: 1.4rem; }

.menu-dropdown {
  position: relative;
}

.menu-dropdown details summary {
  list-style: none;
  cursor: pointer;
}

.menu-dropdown details summary::-webkit-details-marker { display: none; }

.menu-panel {
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 4px;
  min-width: 160px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 4px;
  z-index: 20;
}

.menu-panel button {
  display: block;
  width: 100%;
  text-align: left;
  border: none;
  background: none;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
}

.menu-panel button:hover { background: var(--panel-soft); }

.fab-save {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 50;
  padding: 12px 20px;
  border-radius: 999px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  box-shadow: var(--shadow);
  cursor: pointer;
}

.status-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 14px;
  border-top: 1px solid var(--border);
  background: var(--panel-soft);
  font-size: 12px;
  color: var(--muted);
  flex-shrink: 0;
}

.compare-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  flex: 1;
  min-height: 0;
}

.compare-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  overflow: auto;
}

.compare-col h3 {
  margin: 0;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

@media (max-width: 800px) {
  .shell-body { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .compare-split { grid-template-columns: 1fr; }
}