/* ─── Admin Panel Styles ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
  
  /* Modern Palette */
  --bg-body: #f1f3f9;
  --bg-white: #ffffff;
  --bg-hover: #f8f9fa;
  --bg-sidebar: #ffffff;
  --bg-editor: #ffffff;
  --bg-preview: #1a1d27;
  
  --border-light: #eef1f6;
  --border-medium: #e2e8f0;
  --border-accent: rgba(34, 139, 230, 0.2);
  
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-faint: #cbd5e1;
  
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --accent-glow: rgba(37, 99, 235, 0.15);
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-light: #fef2f2;
  
  --success: #10b981;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background: var(--bg-body);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* ─── Scrollbar ─────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* ─── Admin Header ──────────────────────────────────────────────── */
.admin-header {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border-medium);
  height: 64px;
  display: flex;
  align-items: center;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.admin-header-inner {
  width: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.admin-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.back-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  background: var(--bg-hover);
  text-decoration: none;
  transition: all var(--transition);
}

.back-link:hover {
  background: var(--accent-light);
  color: var(--accent);
  transform: translateX(-2px);
}

.admin-logo-icon {
  font-size: 24px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

.admin-logo h1 {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.admin-logo p {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.admin-actions {
  display: flex;
  gap: 12px;
}

/* ─── Buttons ───────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.btn-lg {
  padding: 12px 24px;
  font-size: 14px;
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
  background: var(--bg-white);
  color: var(--text-secondary);
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--text-muted);
}

.btn-accent {
  background: var(--accent-light);
  color: var(--accent);
}

.btn-accent:hover {
  background: #dbeafe;
}

.btn-danger {
  background: #fff5f5;
  color: #e53e3e;
  border-color: #fed7d7;
}

.btn-danger:hover {
  background: #fff5f5;
  border-color: #feb2b2;
  box-shadow: 0 2px 4px rgba(229, 62, 62, 0.1);
}

/* ─── Admin Layout ──────────────────────────────────────────────── */
.admin-layout {
  display: grid;
  grid-template-columns: 300px 1fr 380px;
  height: calc(100vh - 64px);
  overflow: hidden;
}

@media (max-width: 1400px) {
  .admin-layout { grid-template-columns: 260px 1fr 340px; }
}

@media (max-width: 1000px) {
  .admin-layout { grid-template-columns: 240px 1fr; }
  .admin-preview { display: none; }
}

/* ─── Sidebar (Tree) ────────────────────────────────────────────── */
.admin-sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-medium);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-header h2 {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.tree-container {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

/* ─── Tree Items ────────────────────────────────────────────────── */
.tree-item {
  margin-bottom: 4px;
}

.tree-item-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.tree-item-header:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tree-item-header.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

.tree-icon { font-size: 16px; flex-shrink: 0; }
.tree-label { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.tree-count {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--bg-body);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.tree-toggle {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tree-toggle.open { transform: rotate(90deg); color: var(--text-muted); }

.tree-children {
  padding-left: 24px;
  border-left: 1px dashed var(--border-medium);
  margin-left: 18px;
  margin-top: 2px;
}

.tree-children.collapsed {
  display: none;
}

.tree-resource {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all var(--transition);
  margin: 2px 0;
}

.tree-resource:hover {
  background: var(--bg-hover);
  padding-left: 16px;
}

.tree-resource.active {
  background: var(--accent);
  color: white;
  box-shadow: var(--shadow-sm);
}

.tree-resource.active .tree-resource-dot { background: white; }

.tree-resource-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-faint);
  flex-shrink: 0;
  transition: background var(--transition);
}

/* ─── Main Editor ───────────────────────────────────────────────── */
.admin-main {
  overflow-y: auto;
  padding: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.editor-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: var(--text-muted);
}

.placeholder-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.5;
}

.editor-panel {
  background: var(--bg-white);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 32px;
  width: 100%;
  max-width: 720px;
  box-shadow: var(--shadow-md);
  animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.editor-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.editor-header h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* ─── Form Sections ─────────────────────────────────────────────── */
.editor-form {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.form-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-section h3 {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--accent-light);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 10px 14px;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-family: var(--font-main);
  color: var(--text-primary);
  background: #fdfdfd;
  transition: all var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  background: white;
  box-shadow: 0 0 0 4px var(--accent-glow);
  outline: none;
}

.form-group textarea { min-height: 80px; }

.form-footer {
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  display: flex;
  justify-content: flex-end;
}

/* ─── JSON Preview Panel ────────────────────────────────────────── */
.admin-preview {
  background: var(--bg-preview);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: -4px 0 10px rgba(0,0,0,0.1);
}

.preview-header {
  padding: 18px 24px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.preview-header h2 {
  font-size: 12px;
  font-weight: 700;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.json-preview {
  flex: 1;
  overflow: auto;
  padding: 24px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: #e2e8f0;
  background: transparent;
}

/* ─── Toast ─────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  padding: 14px 28px;
  border-radius: var(--radius-full);
  background: #1e293b;
  color: white;
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.toast.hidden { transform: translateX(-50%) translateY(100px); opacity: 0; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* ─── Dark Mode support for LLD icons if needed ─────────────────── */
.tree-icon-lld { color: var(--purple); }
.tree-icon-html { color: var(--blue); }
.tree-icon-md { color: var(--amber); }

/* ─── Global Utilities ─────────────────────────────────────────── */
.hidden { display: none !important; }

/* ─── Responsive ────────────────────────────────────────────────── */
@media (max-width: 800px) {
  .admin-layout { grid-template-columns: 1fr; height: auto; overflow: visible; }
  .admin-sidebar { height: 400px; }
  .admin-main { padding: 20px; }
  .form-row { grid-template-columns: 1fr; }
  .admin-header-inner { flex-direction: column; height: auto; padding: 16px; gap: 16px; }
}