/* Design System / Color Tokens */
:root {
  /* Common */
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'Fira Code', Consolas, Monaco, monospace;
  --accent-color: #0078d4;
  --accent-hover: #106ebe;
  --accent-active: #005a9e;
  --accent-light: rgba(0, 120, 212, 0.15);
  
  --danger-color: #e81123;
  --danger-hover: #b3000e;
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
  --shadow-md: 0 8px 16px rgba(0,0,0,0.12);
  --shadow-lg: 0 16px 32px rgba(0,0,0,0.2);
}

/* Light Theme Variables */
body.theme-light {
  --bg-app: #f3f3f3;
  --bg-sidebar: rgba(243, 243, 243, 0.7);
  --bg-workspace: rgba(255, 255, 255, 0.75);
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: rgba(255, 255, 255, 1);
  --bg-input: #ffffff;
  --bg-button-sec: #eaeaea;
  --bg-button-sec-hover: #e0e0e0;
  
  --border-color: rgba(0, 0, 0, 0.08);
  --border-focus: var(--accent-color);
  
  --text-main: #202020;
  --text-muted: #5f5f5f;
  --text-inverse: #ffffff;
  
  --acrylic-fallback: #f3f3f3;
  --glass-effect: saturate(180%) blur(25px);
  --acrylic-border: 1px solid rgba(255, 255, 255, 0.4);
}

/* Dark Theme Variables */
body.theme-dark {
  --bg-app: #1c1c1c;
  --bg-sidebar: rgba(32, 32, 32, 0.75);
  --bg-workspace: rgba(28, 28, 28, 0.8);
  --bg-card: rgba(39, 39, 39, 0.85);
  --bg-card-hover: rgba(48, 48, 48, 0.9);
  --bg-input: #2d2d2d;
  --bg-button-sec: rgba(255, 255, 255, 0.08);
  --bg-button-sec-hover: rgba(255, 255, 255, 0.12);
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: var(--accent-color);
  
  --text-main: #f0f0f0;
  --text-muted: #a0a0a0;
  --text-inverse: #1c1c1c;
  
  --acrylic-fallback: #202020;
  --glass-effect: saturate(120%) blur(25px);
  --acrylic-border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Basic Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
}

button {
  background: transparent;
  border: none;
  cursor: pointer;
  color: inherit;
  font: inherit;
  outline: none;
}

body {
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  background-color: var(--bg-app);
  color: var(--text-main);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* App Container (Windows 11 Sidebar + Workspace Layout) */
.app-container {
  display: flex;
  height: 100%;
  width: 100%;
  overflow: hidden;
  position: relative;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(120, 120, 120, 0.2);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(120, 120, 120, 0.4);
}

/* Acrylic / Glassmorphic Sidebar */
.sidebar {
  width: 280px;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--bg-sidebar);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  border-right: var(--border-color) 1px solid;
  transition: background-color var(--transition-normal);
  flex-shrink: 0;
  z-index: 10;
}

.sidebar-header {
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-icon {
  color: var(--accent-color);
}
.brand h1 {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.btn-primary {
  background: var(--accent-color);
  color: #ffffff;
}
.btn-primary:hover {
  background: var(--accent-hover);
}
.btn-primary:active {
  background: var(--accent-active);
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--bg-button-sec);
  color: var(--text-main);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  background: var(--bg-button-sec-hover);
}
.btn-secondary:active {
  transform: scale(0.98);
}

.btn-danger {
  background: rgba(232, 17, 35, 0.1);
  color: var(--danger-color);
  border-color: rgba(232, 17, 35, 0.2);
}
.btn-danger:hover {
  background: var(--danger-color);
  color: #ffffff;
}

.btn-icon {
  width: 100%;
  justify-content: flex-start;
  background: transparent;
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: 6px;
}
.btn-icon:hover {
  background: var(--bg-button-sec-hover);
}

.btn-icon-only {
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--text-main);
  border-color: transparent;
}
.btn-icon-only:hover {
  background: var(--bg-button-sec-hover);
  border-color: var(--border-color);
}

.btn-large {
  padding: 10px 20px;
  font-size: 0.95rem;
}

/* Sidebar Search */
.sidebar-search {
  padding: 0 16px 12px 16px;
}
.search-input-wrapper {
  position: relative;
  width: 100%;
}
.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}
.search-input-wrapper input {
  width: 100%;
  padding: 6px 10px 6px 32px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-main);
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--transition-fast);
}
.search-input-wrapper input:focus {
  border-color: var(--border-focus);
}

/* Sessions List */
.sessions-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.session-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  transition: background-color var(--transition-fast);
  group-hover: opacity-100;
  box-shadow: inset 4px 0 0 0 var(--session-color, transparent);
}
.session-item:hover {
  background-color: var(--bg-button-sec);
}
.session-item.active {
  background-color: var(--bg-button-sec-hover);
  box-shadow: inset 4px 0 0 0 var(--session-color, var(--accent-color));
}
.session-item-content {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex: 1;
}
.session-item-title {
  font-weight: 500;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: flex;
  align-items: center;
}
.session-color-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 6px;
  flex-shrink: 0;
}
.session-item-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}
.session-item-settings {
  opacity: 0;
  transition: opacity var(--transition-fast);
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.session-item:hover .session-item-settings {
  opacity: 1;
}
.session-item-settings:hover {
  background: var(--bg-button-sec-hover);
  color: var(--text-main);
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 12px;
  border-top: var(--border-color) 1px solid;
}

/* Workspace */
.workspace {
  flex: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--bg-workspace);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  transition: background-color var(--transition-normal);
  position: relative;
}

/* Empty State */
.empty-state {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}
.empty-state-card {
  max-width: 420px;
  text-align: center;
  background: var(--bg-card);
  border: var(--border-color) 1px solid;
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  transition: transform var(--transition-normal);
}
.empty-state-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
}
.empty-state-card h2 {
  font-size: 1.4rem;
  font-weight: 600;
}
.empty-state-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Workspace Content Active */
.workspace-content {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.workspace-header {
  padding: 16px 24px;
  border-bottom: var(--border-color) 1px solid;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0,0,0,0.02);
}
.title-area {
  display: flex;
  flex-direction: column;
  flex: 1;
  margin-right: 20px;
}
.session-title-input {
  font-family: var(--font-sans);
  font-size: 1.3rem;
  font-weight: 600;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-main);
  outline: none;
  border-radius: 4px;
  padding: 2px 6px;
  margin-left: -6px;
  transition: all var(--transition-fast);
  width: 100%;
  max-width: 500px;
}
.session-title-input:hover {
  background: var(--bg-button-sec);
}
.session-title-input:focus {
  background: var(--bg-input);
  border-color: var(--border-focus);
}
.session-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.divider {
  width: 1px;
  height: 20px;
  background-color: var(--border-color);
  margin: 0 4px;
}

/* Blocks Container */
.blocks-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
}

/* Block Item (Main component for messages) */
.block-item {
  background: var(--bg-card);
  border: var(--border-color) 1px solid;
  border-radius: 8px;
  padding: 12px 12px 4px 12px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: box-shadow var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  animation: slideIn 0.25s ease-out;
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

.empty-blocks-message {
  text-align: center;
  margin: auto;
  max-width: 900px;
  width: 100%;
}
.block-item:hover {
  box-shadow: var(--shadow-md);
  background: var(--bg-card-hover);
}

/* Color markers based on AI Profiles */
.block-item::before {
  content: '';
  position: absolute;
  left: -1px;
  top: 12px;
  bottom: 12px;
  width: 4px;
  border-radius: 0 4px 4px 0;
  background-color: var(--profile-color, var(--accent-color));
}

/* Drag and Drop styles */
.drag-handle {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  cursor: grab;
  padding: 4px;
  border-radius: 4px;
  margin-right: 4px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  user-select: none;
}
.drag-handle:hover {
  background-color: var(--bg-button-sec-hover);
  color: var(--text-main);
}
.drag-handle:active {
  cursor: grabbing;
}
.block-item.dragging {
  opacity: 0.4;
  border: 1px dashed var(--accent-color);
  background-color: var(--bg-button-sec);
  box-shadow: none;
  animation: none !important;
}
/* Disable transitions/animations during active drag to avoid lagging visual feedback */
.blocks-container.dragging-active .block-item {
  animation: none !important;
  transition: none !important;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.block-left-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

.profile-select {
  padding: 4px 8px;
  font-size: 0.8rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-main);
  outline: none;
  font-weight: 500;
  cursor: pointer;
}
.profile-select:focus {
  border-color: var(--border-focus);
}

.block-label-input {
  padding: 4px 8px;
  font-size: 0.8rem;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  outline: none;
  width: 150px;
  transition: all var(--transition-fast);
}
.block-label-input:hover {
  background: var(--bg-button-sec);
  color: var(--text-main);
}
.block-label-input:focus {
  background: var(--bg-input);
  border-color: var(--border-focus);
  color: var(--text-main);
}

.block-right-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.action-btn {
  padding: 5px;
  border-radius: 4px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.action-btn:hover {
  background: var(--bg-button-sec-hover);
  color: var(--text-main);
}
.action-btn.active {
  background: var(--accent-light);
  color: var(--accent-color);
}
.action-btn:active {
  transform: scale(0.95);
}

/* Edit / Preview area */
.block-body {
  position: relative;
  width: 100%;
}

.block-textarea {
  width: 100%;
  min-height: 80px;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.5;
  resize: none;
  outline: none;
  transition: border-color var(--transition-fast);
  overflow-y: hidden;
}
.block-textarea:focus {
  border-color: var(--border-focus);
}

.block-preview {
  width: 100%;
  min-height: 80px;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  font-size: 0.95rem;
  line-height: 1.6;
  word-break: break-word;
  overflow: auto;
}
/* Style markdown preview output */
.block-preview p {
  margin-bottom: 8px;
}
.block-preview code {
  font-family: var(--font-mono);
  background: var(--bg-button-sec);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}
.block-preview pre {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px;
  overflow-x: auto;
  margin: 12px 0;
}
.block-preview pre code {
  background: transparent;
  padding: 0;
  font-size: 0.9em;
}
.block-preview h1, .block-preview h2, .block-preview h3 {
  margin: 12px 0 6px 0;
  font-weight: 600;
}
.block-preview h1 { font-size: 1.4rem; }
.block-preview h2 { font-size: 1.2rem; }
.block-preview h3 { font-size: 1.1rem; }
.block-preview ul, .block-preview ol {
  padding-left: 20px;
  margin-bottom: 8px;
}

/* Workspace Footer */
.workspace-footer {
  padding: 16px 24px;
  border-top: var(--border-color) 1px solid;
  display: flex;
  justify-content: center;
  background: rgba(0,0,0,0.01);
}

/* Modals */
.modal-overlay {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn var(--transition-fast) ease-out;
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-card {
  width: 100%;
  max-width: 550px;
  background: var(--bg-card);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  border: var(--acrylic-border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  max-height: 85vh;
  overflow: hidden;
  animation: modalScale 0.2s cubic-bezier(0.1, 0.9, 0.2, 1);
}
@keyframes modalScale {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-header {
  padding: 16px 20px;
  border-bottom: var(--border-color) 1px solid;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
}
.modal-body {
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.settings-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.section-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.settings-actions-row {
  display: flex;
  gap: 10px;
}

.profiles-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.profile-settings-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: var(--bg-button-sec);
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
}
.profile-input-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}
.profile-name-input {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.85rem;
  flex: 1;
  outline: none;
}
.profile-name-input:focus {
  border-color: var(--border-focus);
}

.color-picker-wrapper {
  position: relative;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  overflow: hidden;
  border: 1px solid var(--border-color);
  cursor: pointer;
}
.color-picker-wrapper input[type="color"] {
  position: absolute;
  left: -5px;
  top: -5px;
  width: 34px;
  height: 34px;
  border: none;
  cursor: pointer;
}

.modal-footer {
  padding: 16px 20px;
  border-top: var(--border-color) 1px solid;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.about-section {
  border-top: var(--border-color) 1px solid;
  padding-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.about-tip {
  margin-top: 8px;
  padding: 8px;
  background: var(--accent-light);
  color: var(--text-main);
  border-radius: 4px;
  border-left: 3px solid var(--accent-color);
}

/* Toast System */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
}
.toast {
  background: var(--bg-card);
  backdrop-filter: var(--glass-effect);
  -webkit-backdrop-filter: var(--glass-effect);
  border: var(--border-color) 1px solid;
  color: var(--text-main);
  padding: 12px 20px;
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 200px;
  animation: toastIn 0.3s cubic-bezier(0.1, 0.9, 0.2, 1) forwards;
}
@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px) scale(0.9); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.toast.toast-fadeout {
  animation: toastOut 0.25s ease-in forwards;
}
@keyframes toastOut {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to { opacity: 0; transform: translateY(-20px) scale(0.9); }
}
.toast-icon {
  color: #107c41; /* Success Green */
}

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

.dragging {
  opacity: 0.5;
}

/* Quick Select Profiles */
.profile-quick-select {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.quick-select-title {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-right: 4px;
}

.quick-select-btn {
  background: var(--bg-button-sec);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.quick-select-btn:hover {
  background: var(--bg-button-sec-hover);
  border-color: var(--profile-color);
  transform: translateY(-1px);
}

.quick-select-btn:active {
  transform: translateY(0);
}

.quick-select-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--profile-color);
}

.quick-select-add-btn {
  background: var(--bg-button-sec);
  color: var(--text-muted);
  border: 1px dashed var(--border-color);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all var(--transition-fast);
}

.quick-select-add-btn:hover {
  background: var(--bg-button-sec-hover);
  color: var(--text-main);
  border-color: var(--accent-color);
}

.quick-select-close-btn {
  background: transparent;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color var(--transition-fast);
}

.quick-select-close-btn:hover {
  background: var(--bg-button-sec-hover);
  color: var(--text-main);
}

/* Block Select Checkbox */
.block-select-checkbox {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  accent-color: var(--accent-color);
  cursor: pointer;
  margin-right: 8px;
  outline: none;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.block-select-checkbox:hover {
  transform: scale(1.05);
}

/* Header Select All Checkbox Wrapper */
.header-checkbox-wrapper {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.header-checkbox-wrapper:hover {
  background: var(--bg-button-sec-hover);
  border-color: var(--border-color);
}

.btn-icon-only.active {
  background: var(--accent-light);
  color: var(--accent-color);
  border-color: var(--accent-color);
}

/* Color Preset Picker in Dialogue Settings */
.color-preset-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.color-preset-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  display: inline-block;
}

.color-preset-btn:hover {
  transform: scale(1.15);
}

.color-preset-btn.selected {
  border-color: var(--text-main);
  box-shadow: 0 0 0 2px var(--accent-color);
}

/* User Profile Panel in Sidebar */
.sidebar-user-panel {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  margin: 0 8px 8px 8px;
  background: var(--bg-button-sec);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.username-text {
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.settings-profile-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.settings-profile-btn:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--text-color);
}

.settings-profile-btn:active {
  transform: scale(0.9);
}

/* Collapsed Sidebar User Profile adjustments */
@media (min-width: 769px) {
  .sidebar.collapsed .sidebar-user-panel {
    flex-direction: column;
    padding: 8px 4px;
    margin: 0 8px 8px 8px;
    gap: 8px;
  }
  
  .sidebar.collapsed .sidebar-user-panel .username-text {
    display: none;
  }
  
  .sidebar.collapsed .sidebar-user-panel .settings-profile-btn {
    width: 28px;
    height: 28px;
  }
}

/* Authentication Overlay (Login/Register Card) */
.auth-overlay {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn var(--transition-normal) ease-out;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg-card);
  border: var(--acrylic-border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 24px;
  animation: modalScale 0.25s cubic-bezier(0.1, 0.9, 0.2, 1);
}

.auth-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.auth-brand {
  justify-content: center;
  gap: 12px;
  margin-bottom: 4px;
}

.auth-brand h2 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.auth-subtitle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

.auth-input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.auth-input-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-main);
}

.auth-input-group input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-main);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.auth-input-group input:focus {
  border-color: var(--border-focus);
}

.auth-error-msg {
  font-size: 0.8rem;
  color: var(--danger-color);
  background: rgba(232, 17, 35, 0.1);
  border: 1px solid rgba(232, 17, 35, 0.2);
  padding: 8px 12px;
  border-radius: 6px;
  text-align: center;
}

.auth-submit-btn {
  width: 100%;
  margin-top: 8px;
}

.auth-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  border-top: var(--border-color) 1px solid;
  padding-top: 16px;
}

.auth-footer span {
  color: var(--text-muted);
}

.auth-switch-btn {
  background: transparent;
  border: none;
  color: var(--accent-color);
  font-weight: 600;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: background-color var(--transition-fast);
}

.auth-switch-btn:hover {
  text-decoration: underline;
}


/* Sidebar Collapsible & Mobile Responsiveness Styles */

.brand-toggle-btn {
  background: transparent;
  border: none;
  color: var(--accent-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border-radius: 6px;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.brand-toggle-btn:hover {
  background-color: var(--bg-button-sec-hover);
}

.brand-toggle-btn:active {
  transform: scale(0.95);
}

/* Sidebar transition */
.sidebar {
  transition: width var(--transition-normal), transform var(--transition-normal), background-color var(--transition-normal);
}

.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 150;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.sidebar-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--accent-color);
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  align-items: center;
  justify-content: center;
  margin-right: 12px;
  transition: background-color var(--transition-fast);
}

.mobile-menu-btn:hover {
  background-color: var(--bg-button-sec-hover);
}

.mobile-menu-btn:active {
  transform: scale(0.95);
}

/* Desktop Collapsed Sidebar styles */
@media (min-width: 769px) {
  .sidebar.collapsed {
    width: 64px;
  }
  .sidebar.collapsed .brand h1 {
    display: none;
  }
  .sidebar.collapsed .sidebar-header {
    align-items: center;
    padding: 20px 8px;
    gap: 12px;
  }
  .sidebar.collapsed .brand {
    justify-content: center;
    width: 100%;
  }
  .sidebar.collapsed #new-session-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
    border-radius: 6px;
  }
  .sidebar.collapsed #new-session-btn span {
    display: none;
  }
  .sidebar.collapsed .sidebar-search {
    padding: 0 8px 12px 8px;
  }
  .sidebar.collapsed .search-input-wrapper {
    width: 40px;
    height: 40px;
    margin: 0 auto;
  }
  .sidebar.collapsed .search-input-wrapper input {
    width: 40px;
    height: 40px;
    padding: 0;
    text-indent: -9999px;
    cursor: pointer;
  }
  .sidebar.collapsed .search-input-wrapper input::placeholder {
    color: transparent;
  }
  .sidebar.collapsed .search-icon {
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
  }
  .sidebar.collapsed .sessions-list {
    display: none;
  }
  .sidebar.collapsed .sidebar-footer {
    padding: 8px;
    display: flex;
    justify-content: center;
  }
  .sidebar.collapsed #settings-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
    border-radius: 6px;
  }
  .sidebar.collapsed #settings-btn span {
    display: none;
  }
}

/* Mobile responsive styles */
@media (max-width: 768px) {
  .mobile-menu-btn {
    display: inline-flex;
  }
  
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    transform: translateX(-100%);
    z-index: 200;
    background: var(--bg-sidebar);
    box-shadow: var(--shadow-lg);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
  }
  
  .sidebar-header .brand {
    flex: 1;
  }

  /* Make sure the main workspace takes full height and width without sidebar margin */
  .workspace {
    width: 100vw;
  }
  
  .workspace-header {
    padding: 12px 16px;
  }
  
  .blocks-container {
    padding: 16px;
  }
}

/* Auth Divider & Google Login Button */
.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin: 4px 0;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-color);
}

.auth-divider:not(:empty)::before {
  margin-right: 10px;
}

.auth-divider:not(:empty)::after {
  margin-left: 10px;
}

.google-signin-btn-container {
  display: flex;
  justify-content: center;
  width: 100%;
  margin: 4px 0;
}