:root {
  --bg-app: #E2DAF2; /* Soft pastel lavender background */
  --bg-sidebar: rgba(255, 255, 255, 0.65); /* Frosted glass sidebar */
  --bg-card: #FFFFFF;
  --bg-hover: rgba(0, 0, 0, 0.04);
  --color-primary: #3139FB; /* Arc-like electric blue */
  --color-primary-hover: #1E25C9;
  --color-primary-light: rgba(49, 57, 251, 0.08);
  --color-text: #1C1936;
  --color-text-muted: #7E7A99;
  --border-color: rgba(0, 0, 0, 0.06);
  --border-glass: rgba(255, 255, 255, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(49, 57, 251, 0.05);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.06);
  
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Inter', Menlo, Monaco, monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--color-text);
  height: 100vh;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  -webkit-font-smoothing: antialiased;
}

/* App Container */
.app-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  width: calc(100vw - 40px);
  height: calc(100vh - 40px);
  max-width: 1600px;
  max-height: 1000px;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-glass);
  background: transparent;
  transition: all 0.3s ease;
}

/* Sidebar styling */
.sidebar {
  background: var(--bg-sidebar);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  padding: 24px 16px;
  user-select: none;
  -webkit-user-select: none;
}

/* Sidebar branding logo & wordmark */
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
  margin-bottom: 12px;
}

.brand-logo {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.brand-logo svg {
  width: 100%;
  height: 100%;
}

.brand-name {
  font-family: var(--font-sans);
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--color-text);
  line-height: 1;
  text-transform: lowercase;
}

/* Hover micro-animation for logo wobble */
.sidebar-brand:hover .brand-logo {
  transform: scale(1.12) rotate(6deg);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding: 0 10px;
}

.workspace-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.workspace-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.workspace-meta {
  display: flex;
  flex-direction: column;
}

.workspace-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.2;
}

.workspace-author {
  font-size: 11px;
  color: var(--color-text-muted);
  font-weight: 500;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--color-text);
}

.back-btn {
  display: none; /* Hidden on desktop */
}

/* Tree Navigation Area */
.tree-scroll-container {
  flex-grow: 1;
  overflow-y: auto;
  margin-bottom: 16px;
  padding-right: 4px;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.1) transparent;
}

.tree-scroll-container::-webkit-scrollbar {
  width: 5px;
}

.tree-scroll-container::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 10px;
}

.tree-nodes {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* Tree Nodes Recursive Indentation & Lines */
.tree-node-container {
  display: flex;
  flex-direction: column;
}

.folder-children {
  margin-left: 0; /* Remove compounding margin - depth-based padding is handled in JS */
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 1px; /* Tighter gap for compact Arc feel */
  transition: max-height 0.3s ease-out;
  overflow: hidden;
}

/* Tree Item UI */
.tree-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px; /* Balanced padding */
  height: 32px; /* Breathable, readable row height */
  border-radius: 8px; /* Clean rounded corners */
  cursor: pointer;
  user-select: none;
  font-size: 14px; /* Highly readable font size */
  font-weight: 500;
  transition: background-color 0.15s ease;
  position: relative;
}

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

.tree-item.selected {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

.tree-item-content {
  display: flex;
  align-items: center;
  gap: 8px; /* Snug gap */
  flex-grow: 1;
  min-width: 0;
  height: 100%;
}

.tree-item-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tree-item-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.15s ease;
}

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

.item-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  width: 20px;
  height: 20px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.item-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--color-text);
}

/* Drag and Drop Visual States */
.tree-item.dragging {
  opacity: 0.4;
  transform: scale(0.98);
}

/* Floating drop indicator line (replaces border-based approach) */
.drop-indicator {
  position: fixed;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  pointer-events: none;
  z-index: 9999;
  transition: top 0.04s ease, left 0.04s ease, width 0.04s ease;
}

.drop-indicator::before,
.drop-indicator::after {
  content: '';
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--color-primary);
  border-radius: 50%;
}

.drop-indicator::before { left: -3px; }
.drop-indicator::after  { right: -3px; }

.drag-over-inside {
  background-color: var(--color-primary-light) !important;
  border-radius: 8px;
  outline: 1.5px solid var(--color-primary);
  outline-offset: -1px;
}

/* Node Icons */
.folder-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: transform 0.2s ease;
}

.folder-toggle.collapsed {
  transform: rotate(-90deg);
}

.folder-toggle-spacer {
  display: inline-block;
  width: 14px; /* Matches folder-toggle width */
  flex-shrink: 0;
}

.folder-icon {
  color: var(--color-primary);
  display: flex;
  align-items: center;
}

.folder-icon svg {
  width: 16px;
  height: 16px;
}

.link-favicon {
  width: 16px;
  height: 16px;
  object-fit: contain;
  border-radius: 4px;
  background-color: transparent;
}

/* Sidebar Footer */
.sidebar-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-actions {
  display: flex;
  gap: 8px;
}

.footer-actions .footer-btn {
  flex: 1;
}

.footer-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 10px;
  border-radius: 12px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.footer-btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.footer-utility {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}

/* Share dialog toggle + link copy row */
.share-toggle-container {
  margin: 16px 0;
}

.switch-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.switch {
  position: relative;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  inset: 0;
  background: var(--border-color);
  border-radius: 24px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  top: 3px;
  background: #FFFFFF;
  border-radius: 50%;
  transition: transform 0.2s ease;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.switch input:checked + .slider {
  background: var(--color-primary);
}

.switch input:checked + .slider::before {
  transform: translateX(20px);
}

.share-link-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.share-link-section label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--color-text);
}

.copy-input-group {
  display: flex;
  gap: 8px;
}

.copy-input-group input {
  flex: 1;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-hover);
  color: var(--color-text);
  outline: none;
}

.share-hint {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.utility-btn {
  flex-grow: 1;
  background: transparent;
  border: none;
  padding: 8px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.utility-btn:hover {
  background: var(--bg-hover);
  color: var(--color-text);
}

.clone-banner-overlay {
  background: var(--color-primary-light);
  padding: 12px;
  border-radius: 14px;
  border: 1px solid rgba(49, 57, 251, 0.15);
  margin-top: 8px;
  display: flex;
  justify-content: center;
}

.clone-btn {
  width: 100%;
  justify-content: center;
}

/* Main Viewport Panel styling */
.main-viewport {
  padding: 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
}

.viewport-card {
  width: 100%;
  height: 100%;
  background: var(--bg-card);
  border-radius: 20px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: all 0.3s ease;
}

/* Empty State Styling */
.empty-card {
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
}

/* Brand splash empty-state illustrations */
.brand-splash {
  position: relative;
  width: 140px;
  height: 140px;
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.splash-logo {
  width: 100px;
  height: 100px;
  z-index: 5;
  filter: drop-shadow(0 12px 24px rgba(124, 58, 237, 0.18));
  transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.empty-card:hover .splash-logo {
  transform: scale(1.15) rotate(-6deg);
}

/* Decorative background splash drops */
.splash-drop {
  position: absolute;
  border-radius: 50%;
  opacity: 0.35;
  filter: blur(1.5px);
  animation: float-drop 4s ease-in-out infinite alternate;
  z-index: 1;
}

.splash-drop.sd-1 {
  width: 14px;
  height: 14px;
  background: var(--color-primary); /* Dynamically changes with theme */
  top: 15px;
  left: 20px;
  animation-delay: 0s;
}

.splash-drop.sd-2 {
  width: 20px;
  height: 20px;
  background: #F59E0B; /* Yellow */
  bottom: 20px;
  right: 15px;
  animation-delay: 1s;
}

.splash-drop.sd-3 {
  width: 12px;
  height: 12px;
  background: #10B981; /* Green */
  top: 35px;
  right: 10px;
  animation-delay: 2s;
}

.splash-drop.sd-4 {
  width: 18px;
  height: 18px;
  background: #EF4444; /* Red */
  bottom: 10px;
  left: 30px;
  animation-delay: 3s;
}

@keyframes float-drop {
  0% {
    transform: translateY(0) scale(1);
  }
  100% {
    transform: translateY(-8px) scale(1.1);
  }
}

.empty-card h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.empty-card p {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 460px;
  line-height: 1.5;
  margin-bottom: 32px;
}

.quick-tips {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--color-primary-light);
  padding: 16px 24px;
  border-radius: 14px;
  text-align: left;
  border: 1px dashed rgba(49, 57, 251, 0.25);
}

.tip-item {
  font-size: 13.5px;
  line-height: 1.4;
}

/* Preview / iframe View */
.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.8);
  gap: 12px;
}

.preview-title-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex-grow: 1;
}

.active-favicon {
  width: 24px;
  height: 24px;
  object-fit: contain;
  border-radius: 5px;
  padding: 2px;
  background: var(--bg-hover);
}

.active-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

#active-title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#active-url {
  font-size: 11px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.action-btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.action-btn-primary:hover {
  background: var(--color-primary-hover);
}

.preview-content {
  flex-grow: 1;
  position: relative;
  background: #FDFDFD;
}

#preview-iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.iframe-warning {
  position: absolute;
  inset: 0;
  background: var(--bg-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
  z-index: 10;
}

.warning-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.iframe-warning h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.iframe-warning p {
  font-size: 14px;
  color: var(--color-text-muted);
  max-width: 360px;
  line-height: 1.5;
  margin-bottom: 24px;
}

.warning-btn {
  background: var(--color-primary);
  color: #FFFFFF;
  border: none;
  padding: 10px 24px;
  border-radius: 10px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

.warning-btn:hover {
  background: var(--color-primary-hover);
}

/* Resilient Context Menu (Popover) */
.context-menu {
  display: none; /* Force hide when closed to prevent stray menu items */
  position: fixed;
  inset: auto; /* CRITICAL: Resets browser Popover default inset: 0 centering */
  background: rgba(255, 255, 255, 0.72); /* Elegant translucent white */
  backdrop-filter: blur(20px) saturate(190%); /* Premium frosted-glass effect */
  -webkit-backdrop-filter: blur(20px) saturate(190%);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08); /* Softer shadow for glass look */
  padding: 6px;
  min-width: 160px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  margin: 0 !important; /* CRITICAL: Resets browser Popover layout override */
}

.context-menu:popover-open {
  display: flex !important;
  flex-direction: column;
}

.context-menu::backdrop {
  background: transparent;
}

.menu-item {
  background: transparent;
  border: none;
  padding: 8px 12px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  transition: background-color 0.2s ease;
}

.menu-item:hover {
  background-color: var(--bg-hover);
}

.menu-item.danger {
  color: #EA4335;
}

.menu-item.danger:hover {
  background-color: rgba(234, 67, 53, 0.08);
}

.menu-separator {
  height: 1px;
  background: var(--border-color);
  margin: 4px 6px;
}

/* Modals */
.custom-dialog {
  border: none;
  border-radius: 20px;
  padding: 24px;
  background: #FFFFFF;
  box-shadow: var(--shadow-lg);
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 440px;
  outline: none;
}

.custom-dialog::backdrop {
  background: rgba(28, 25, 54, 0.4);
  backdrop-filter: blur(8px);
}

.custom-dialog h3 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 8px;
}

.dialog-desc {
  font-size: 13.5px;
  color: var(--color-text-muted);
  line-height: 1.4;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-group label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--color-text);
}

.form-group input {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--color-text);
  background-color: #FAFAFA;
  transition: all 0.2s ease;
  outline: none;
}

.form-group input:focus {
  background-color: #FFFFFF;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

/* Theme Color Picker Grid */
.theme-color-picker {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  justify-content: space-between;
}

.color-dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.1);
  cursor: pointer;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  padding: 0;
  outline: none;
}

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

.color-dot.active {
  box-shadow: 0 0 0 2px #FFFFFF, 0 0 0 4.5px currentColor;
}

/* Color Dot Assignments */
.color-dot.charcoal { background-color: #1E1E1E; color: #1E1E1E; }
.color-dot.teal { background-color: #00B08B; color: #00B08B; }
.color-dot.blue { background-color: #0084C7; color: #0084C7; }
.color-dot.purple { background-color: #5C5FA8; color: #5C5FA8; }
.color-dot.amber { background-color: #E49E19; color: #E49E19; }
.color-dot.pink { background-color: #DF6E8C; color: #DF6E8C; }
.color-dot.red { background-color: #C53D4C; color: #C53D4C; }
.color-dot.orange { background-color: #E66738; color: #E66738; }

.btn {
  padding: 10px 20px;
  border-radius: 10px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-secondary:hover {
  background: var(--bg-hover);
}

.btn-primary {
  background: var(--color-primary);
  border: none;
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

.danger-btn {
  background: #C53D4C;
  border: none;
  color: #FFFFFF;
}

.danger-btn:hover {
  background: #A82E3C;
}

/* Ensure closed dialogs are completely hidden regardless of browser defaults */
.custom-dialog:not([open]) {
  display: none !important;
}

/* Switch styling for share toggle */
.share-toggle-container {
  background: var(--color-primary-light);
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 20px;
}

.switch-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: #D2CEDC;
  transition: .3s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--color-primary);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

/* Copy Link Section */
.share-link-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: fadeIn 0.2s ease;
}

.copy-input-group {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

.copy-input-group input {
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 12px;
  background-color: #FAFAFA;
}

.share-hint {
  font-size: 11px;
  color: var(--color-text-muted);
  line-height: 1.4;
  margin-top: 4px;
}

/* User profile styling */
.user-profile {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-hover);
  padding: 12px 16px;
  border-radius: 14px;
  margin-bottom: 16px;
}

.profile-pic {
  width: 48px;
  height: 48px;
  border-radius: 50%;
}

.profile-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.profile-meta h4 {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
}

.profile-meta span {
  font-size: 12px;
  color: var(--color-text-muted);
}

.google-sign-in-box {
  display: flex;
  justify-content: center;
  margin: 16px 0;
}

.google-btn {
  background: #FFFFFF;
  border: 1px solid #D2D2D2;
  border-radius: 10px;
  color: #3C4043;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: background-color 0.2s ease;
}

.google-btn:hover {
  background: #F8F9FA;
  border-color: #C0C0C0;
}

/* Loading Spinners */
.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  color: var(--color-text-muted);
  gap: 12px;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(49, 57, 251, 0.1);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.hidden {
  display: none !important;
}

.dialog-error {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: #C53D4C;
  margin-top: -8px;
  margin-bottom: 8px;
  padding: 6px 10px;
  background: rgba(197, 61, 76, 0.08);
  border-radius: 8px;
  border: 1px solid rgba(197, 61, 76, 0.15);
}

/* ===============================================================
   RESPONSIVE DESIGN (Mobile & Tablet)
   =============================================================== */
@media (max-width: 768px) {
  body {
    padding: 0;
  }

  .app-container {
    grid-template-columns: 1fr; /* Single column flow */
    width: 100vw;
    height: 100vh;
    border-radius: 0;
    border: none;
  }

  /* List-Detail Panel State Switching */
  /* By default, show sidebar, hide main view */
  .sidebar {
    display: flex;
    width: 100vw;
    height: 100vh;
  }

  .main-viewport {
    display: none;
    width: 100vw;
    height: 100vh;
    padding: 0; /* Full screen cards on mobile */
  }

  .viewport-card {
    border-radius: 0;
    border: none;
    box-shadow: none;
  }

  /* When preview mode is active, swap views */
  .app-container.preview-active .sidebar {
    display: none;
  }

  .app-container.preview-active .main-viewport {
    display: flex;
  }

  /* Show mobile Back button */
  .back-btn {
    display: flex;
    color: var(--color-text-muted);
    margin-right: 4px;
  }

  /* Optimize modal popup sizing on small screens */
  .custom-dialog {
    width: 100%;
    max-width: 100%;
    border-radius: 24px 24px 0 0;
    position: fixed;
    top: auto;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.15);
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }

  .custom-dialog::backdrop {
    backdrop-filter: blur(4px);
  }
}

@keyframes slideUp {
  from { transform: translate(-50%, 100%); }
  to { transform: translate(-50%, 0); }
}