:root {
  --bg: #f0f4f8;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --border: #dbe3ef;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --warn-soft: #fffbeb;
  --warn-border: #fcd34d;
  --settings-soft: #f8fafc;
  --settings-accent: #1d4ed8;
  --memory-soft: #fef2f2;
  --memory-accent: #b91c1c;
  --overview-soft: #f0fdf4;
  --overview-accent: #15803d;
  --service-soft: #fffbeb;
  --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;
}

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

.scenario-switch button {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
}

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

.scenario-switch button[data-scenario="service"].active {
  border-color: var(--warn-border);
  background: var(--service-soft);
  color: #92400e;
}

.scenario-switch button[data-scenario="settings"].active {
  border-color: #93c5fd;
  background: var(--settings-soft);
  color: var(--settings-accent);
}

.scenario-switch button[data-scenario="memory"].active {
  border-color: #fecaca;
  background: var(--memory-soft);
  color: var(--memory-accent);
}

.scenario-switch button[data-scenario="overview"].active {
  border-color: #86efac;
  background: var(--overview-soft);
  color: var(--overview-accent);
}

.path-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  min-width: 0;
}

.path-header.ctx-service { background: var(--service-soft); }
.path-header.ctx-settings { background: var(--settings-soft); }
.path-header.ctx-memory { background: var(--memory-soft); }
.path-header.ctx-overview { background: var(--overview-soft); }

.breadcrumbs {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 4px;
  min-width: 0;
  flex: 1;
  overflow: hidden;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.breadcrumb {
  border: none;
  background: none;
  padding: 1px 4px;
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  white-space: nowrap;
}

.breadcrumb.current { color: var(--text); font-weight: 600; cursor: default; }
.breadcrumb-sep { opacity: 0.35; color: #64748b; user-select: none; }

.breadcrumb.node-settings-crumb-prefix { color: var(--settings-accent); font-weight: 700; }
.breadcrumb.node-memory-crumb-prefix { color: var(--memory-accent); font-weight: 700; }
.breadcrumb.node-overview-crumb-prefix { color: var(--overview-accent); font-weight: 700; }

.breadcrumb-chip {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.breadcrumb-chip.settings { background: #dbeafe; color: var(--settings-accent); }
.breadcrumb-chip.memory { background: #fee2e2; color: var(--memory-accent); }
.breadcrumb-chip.overview { background: #dcfce7; color: var(--overview-accent); }

.domain-select,
.view-select {
  flex: 0 0 auto;
  max-width: min(240px, 38vw);
  padding: 5px 28px 5px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.35;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}

.domain-select:focus,
.view-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15);
}

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

.spacer { flex: 1; min-width: 8px; }

.btn {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 8px;
  padding: 0 10px;
  height: 28px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

.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-success { color: #166534; border-color: #86efac; background: var(--success-soft); }
.btn-warn { color: #92400e; border-color: var(--warn-border); background: var(--warn-soft); }
.btn-ghost { border-color: transparent; background: transparent; }
.btn-icon { width: 28px; padding: 0; }

.view-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
}

.view-toggle button {
  border: none;
  background: var(--panel);
  padding: 0 8px;
  height: 28px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
}

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

.view-toggle button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.file-lock {
  font-size: 14px;
  opacity: 0.75;
  flex-shrink: 0;
}

.vdivider {
  width: 1px;
  height: 20px;
  background: var(--border);
  flex-shrink: 0;
}

.preview-body {
  flex: 1;
  overflow: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.doc-title-slab {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-soft);
}

.doc-title-slab h2 {
  margin: 0;
  font-size: 20px;
  font-family: ui-monospace, Menlo, Monaco, Consolas, monospace;
  display: flex;
  align-items: center;
  gap: 8px;
}

.preview-hint {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.mode-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel-soft);
}

.mode-rail button {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
}

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

.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); }

.hidden { display: none !important; }

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