:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --panel-soft: #eef3ff;
  --border: #d7deeb;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #3b82f6;
  --danger: #dc2626;
}

* { 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-back {
  position: fixed;
  top: 12px;
  right: 12px;
  z-index: 100;
  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: 0 4px 16px rgba(15, 23, 42, 0.08);
}

.demo-back:hover { background: var(--panel-soft); }

.demo-badge {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 6px 10px;
  border-radius: 8px;
  background: #1e293b;
  color: #f8fafc;
  font-size: 11px;
  font-weight: 600;
}

.app-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.app-header h1 { margin: 0; font-size: 18px; }
.app-header span { color: var(--muted); font-size: 13px; }

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 14px;
  overflow: auto;
}

.tree-search {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
  margin-bottom: 10px;
}

.tree-item {
  font-size: 13px;
  padding: 5px 8px;
  border-radius: 6px;
  color: var(--muted);
  cursor: default;
}

.tree-item.file.active {
  background: #dbeafe;
  color: #1e3a8a;
  font-weight: 600;
}

.tree-children { margin-left: 14px; border-left: 1px dashed var(--border); padding-left: 8px; }

.workspace {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.path-bar {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  font-size: 12px;
  color: var(--muted);
}

.path-bar strong { color: var(--text); }

.editor-area {
  flex: 1;
  padding: 16px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.field-label { font-size: 12px; color: var(--muted); font-weight: 600; }

.title-input,
.editor-mock,
.yaml-mock {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  padding: 10px 12px;
  font-size: 13px;
  font-family: inherit;
}

.editor-mock {
  flex: 1;
  min-height: 180px;
  line-height: 1.5;
  color: var(--muted);
  white-space: pre-wrap;
}

.right-panel {
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  padding: 8px 12px;
  font-size: 13px;
  cursor: pointer;
}

.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-danger { color: var(--danger); border-color: #fecaca; background: #fff5f5; }

.mode-btn {
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  text-align: left;
  padding: 7px 10px;
  font-size: 12px;
  cursor: pointer;
  width: 100%;
}

.mode-btn:hover:not(:disabled) { background: var(--panel-soft); }
.mode-btn.active { background: #dbeafe; color: #1e3a8a; font-weight: 600; }
.mode-btn:disabled { opacity: 0.45; cursor: not-allowed; }

.mode-group-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 10px 0 6px;
  font-weight: 700;
}

.mode-group-title:first-child { margin-top: 0; }

.pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  padding: 6px 12px;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
}

.pill.active { background: #dbeafe; border-color: #93c5fd; color: #1e3a8a; font-weight: 600; }
.pill:disabled { opacity: 0.45; cursor: not-allowed; }

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

.layout-body {
  min-height: 0;
  overflow: hidden;
}