:root {
  color-scheme: light dark;
  --bg-color: #ffffff;
  --sidebar-bg: #fafafa;
  --text-color: #111827;
  --text-muted: #9ca3af;
  --border-color: #e5e7eb;
  --hover-color: #f3f4f6;
  --accent-color: #2563eb;
  --font-sans: system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #111111;
    --sidebar-bg: #181818;
    --text-color: #e5e5e5;
    --text-muted: #737373;
    --border-color: #2a2a2a;
    --hover-color: #262626;
    --accent-color: #60a5fa;
  }
}

body {
  margin: 0;
  display: flex;
  height: 100vh;
  font-family: var(--font-sans);
  color: var(--text-color);
  background: var(--bg-color);
}

/* Enforce hidden attribute */
[hidden] {
  display: none !important;
}

/* Typography & Forms */
button {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 4px 8px;
  cursor: pointer;
  font-size: 14px;
}
button:hover {
  background: var(--hover-color);
}
.primary-btn {
  background: var(--text-color);
  color: var(--bg-color);
  border: none;
  transition: opacity 0.2s;
}
.primary-btn:hover {
  background: var(--text-color);
  opacity: 0.9;
}
input[type="text"], input[type="password"] {
  padding: 6px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 14px;
}

/* Native Dialog */
dialog {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
  background: var(--bg-color);
}
dialog::backdrop {
  background: var(--bg-color);
}
.dialog-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 16px;
}

/* Sidebar */
aside {
  width: 260px;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  background: var(--sidebar-bg);
}
.sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
#tree-root {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  font-size: 14px;
}

/* Icons */
.icon {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  display: inline-block;
}
.icon-sm {
  width: 14px;
  height: 14px;
}
.icon-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Native Details Tree */
details {
  margin-left: 14px;
}
summary {
  cursor: pointer;
  padding: 4px 2px;
  list-style: none; /* Hide default arrow in some browsers */
  display: flex;
  align-items: center;
  user-select: none;
}
summary::-webkit-details-marker {
  display: none;
}
.folder-caret {
  width: 12px;
  height: 12px;
  margin-right: 4px;
  color: var(--text-muted);
  transition: transform 0.1s;
}
details[open] > summary .folder-caret {
  transform: rotate(90deg);
}
.file-node {
  padding: 4px 2px 4px 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.file-node:hover, summary:hover {
  background: var(--hover-color);
}
.active-node {
  color: var(--accent-color);
  font-weight: 500;
}
.node-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tree-actions {
  display: none;
  gap: 2px;
}
.file-node:hover .tree-actions, summary:hover .tree-actions {
  display: flex;
}
.tree-actions button {
  padding: 2px 4px;
  border: none;
  font-size: 12px;
  color: var(--text-muted);
}
.tree-actions button:hover {
  color: var(--text-color);
  background: var(--border-color);
}

/* Main Editor */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
}
.editor-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.breadcrumbs {
  font-weight: 500;
  color: var(--text-color);
}
.editor-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}
#save-status {
  font-size: 12px;
  color: var(--text-muted);
}
.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  user-select: none;
}
#editor {
  flex: 1;
  border: none;
  resize: none;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  outline: none;
  background: transparent;
}