:root {
  --vscode-bg: #1e1e1e;
  --vscode-sidebar-bg: #252526;
  --vscode-toolbar-bg: #2d2d30;
  --vscode-border: #3e3e42;
  --vscode-hover: #2a2d2e;
  --vscode-active: #007acc;
  --vscode-text: #cccccc;
  --vscode-text-muted: #858585;
  --vscode-accent: #4ec9b0;
  --vscode-warning: #ffcc00;
  --vscode-error: #f44747;
  --vscode-success: #4ec9b0;
  --vscode-radius: 4px;
  --vscode-shadow: 0 2px 8px rgba(0,0,0,0.3);
  --vscode-input-bg: #3c3c3c;
  --vscode-button-bg: #0e639c;
  --vscode-button-hover: #1177bb;
  --vscode-card-bg: #2d2d30;
}

body.theme-cloud {
  background: var(--vscode-bg);
  color: var(--vscode-text);
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
}

.layout { 
  display: flex; 
  gap: 16px; 
  padding: 16px;
  min-height: calc(100vh - 60px);
}

.sidebar { 
  width: 320px; 
  background: var(--vscode-sidebar-bg); 
  border: 1px solid var(--vscode-border); 
  border-radius: var(--vscode-radius); 
  padding: 16px;
  box-shadow: var(--vscode-shadow);
}

.sidebar-header { 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--vscode-border);
}

.sidebar-header h3 {
  color: var(--vscode-text);
  font-size: 16px;
  font-weight: 600;
  margin: 0;
}

.main { 
  flex: 1; 
  min-width: 0;
}

.toolbar { 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  background: var(--vscode-toolbar-bg); 
  border: 1px solid var(--vscode-border); 
  border-radius: var(--vscode-radius); 
  padding: 12px 16px; 
  margin-bottom: 16px;
  box-shadow: var(--vscode-shadow);
}

.toolbar span {
  font-size: 15px;
  font-weight: 500;
  color: var(--vscode-text);
}

.grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); 
  gap: 16px;
}

.list { 
  display: grid; 
  gap: 12px;
}

.card { 
  background: var(--vscode-card-bg); 
  border: 1px solid var(--vscode-border); 
  border-radius: var(--vscode-radius); 
  padding: 20px; 
  box-shadow: var(--vscode-shadow);
}

/* Tree View Styles */
.tree-item {
  margin-bottom: 8px;
}

.tree-item-header {
  display: flex;
  align-items: center;
  padding: 8px;
  border-radius: var(--vscode-radius);
  cursor: pointer;
  transition: background 0.2s;
  background: rgba(255,255,255,0.03);
  border: 1px solid transparent;
}

.tree-item-header:hover {
  background: var(--vscode-hover);
}

.tree-item-header.expanded {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.1);
}

.tree-toggle {
  display: inline-block;
  width: 20px;
  text-align: center;
  font-size: 10px;
  color: var(--vscode-text-muted);
  transition: transform 0.2s;
  margin-right: 4px;
}

.tree-toggle.expanded {
  transform: rotate(90deg);
}

.system-icon, .module-icon {
  margin-right: 8px;
  font-size: 16px;
}

.item-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.2s;
}

.tree-item-header:hover .item-actions,
.tree-child-item:hover .item-actions {
  opacity: 1;
}

.tree-item-content {
  margin-left: 22px;
  border-left: 1px solid rgba(255,255,255,0.05);
  display: none;
  padding-left: 4px;
}

.tree-item-content.expanded {
  display: block;
}

.tree-module-wrapper {
  margin-top: 4px;
}

.tree-child-item {
  display: flex;
  align-items: center;
  padding: 6px 8px;
  border-radius: var(--vscode-radius);
  cursor: pointer;
  font-size: 14px;
  color: #ddd;
}

.tree-child-item:hover {
  background: var(--vscode-hover);
  color: #fff;
}

/* Form Styles */
.form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.form input, .form textarea, .form select {
  background: var(--vscode-input-bg);
  border: 1px solid var(--vscode-border);
  color: var(--vscode-text);
  padding: 8px 12px;
  border-radius: var(--vscode-radius);
  font-family: inherit;
  font-size: 14px;
}

.form input:focus, .form textarea:focus, .form select:focus {
  outline: none;
  border-color: var(--vscode-active);
}

.btn {
  background: var(--vscode-button-bg);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: var(--vscode-radius);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

.btn:hover {
  background: var(--vscode-button-hover);
}

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  color: var(--vscode-text-muted);
  font-size: 14px;
}

.btn-icon:hover {
  background: rgba(255,255,255,0.1);
  color: var(--vscode-text);
}

.btn-icon.sm {
  font-size: 12px;
  padding: 2px 4px;
}

.btn-delete:hover { color: var(--vscode-error); }
.btn-edit:hover { color: var(--vscode-accent); }

/* Note List Styles */
.note-item {
  background: rgba(0,0,0,0.2);
  border-left: 3px solid var(--vscode-accent);
  padding: 8px 12px;
  margin-bottom: 8px;
  border-radius: 0 var(--vscode-radius) var(--vscode-radius) 0;
  font-size: 13px;
  cursor: pointer;
}

.note-item:hover {
  background: rgba(255,255,255,0.05);
}

.note-meta {
  display: flex;
  justify-content: space-between;
  color: var(--vscode-text-muted);
  font-size: 12px;
  margin-bottom: 4px;
}

.note-preview {
  color: #ccc;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Attachment Styles */
.attachment-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px;
  background: rgba(0,0,0,0.2);
  border-radius: 4px;
  margin-bottom: 8px;
}

.attachment-name {
  color: var(--vscode-accent);
  text-decoration: none;
}

.attachment-name:hover {
  text-decoration: underline;
}

/* Filter Group Styles */
.filter-group {
  display: flex;
  gap: 16px;
  align-items: center;
}

.filter-group label {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--vscode-text);
}

#filter-major-dynamic {
  display: flex;
  align-items: center;
  gap: 16px 12px;
  flex-wrap: wrap;
}
#filter-major-dynamic label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.form-row.radio-group {
  display: flex;
  gap: 20px;
  align-items: center;
  margin-bottom: 16px;
  padding: 8px 12px;
  background: var(--vscode-input-bg);
  border-radius: var(--vscode-radius);
  border: 1px solid var(--vscode-border);
}

.form-row.radio-group .label {
  font-weight: 600;
  color: var(--vscode-text-muted);
}

.form-row.radio-group label {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--vscode-text);
}

#sys-major-dynamic {
  display: flex;
  align-items: center;
  gap: 16px 12px;
  flex-wrap: wrap;
}
#sys-major-dynamic label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

input[type="radio"] {
  accent-color: var(--vscode-active);
  width: 16px;
  height: 16px;
}

/* Modal Styles */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  justify-content: center;
  align-items: center;
}

.modal-overlay.open {
  display: flex;
}

.modal {
  background: var(--vscode-card-bg);
  border: 1px solid var(--vscode-border);
  border-radius: var(--vscode-radius);
  width: 400px;
  max-width: 90%;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
}

#category-manager-modal .modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 500px;
}

.modal-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--vscode-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--vscode-text);
}

.modal-close {
  background: none;
  border: none;
  color: var(--vscode-text-muted);
  font-size: 20px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.modal-close:hover {
  color: var(--vscode-text);
}

.modal-body {
  padding: 16px;
  color: var(--vscode-text);
}

.modal-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--vscode-border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--vscode-border);
  color: var(--vscode-text);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.05);
}

/* Login Form Styles */
#auth {
  max-width: 400px;
  margin: 100px auto;
  text-align: center;
}

/* Loading Overlay Styles */
.loading-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  color: #fff;
}

.loading-spinner {
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top: 4px solid #fff;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin-bottom: 16px;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}