.uml-viewer-page {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: 100vh;
  background: #f8f9fa;
  position: relative;
  transition: grid-template-columns 0.3s ease;
}

.uml-viewer-page:has(.uml-viewer-page__sidebar.collapsed) {
  grid-template-columns: 0 1fr;
}

/* Sidebar */
.uml-viewer-page__sidebar {
  background: white;
  border-right: 1px solid var(--border-color, #e0e0e0);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, opacity 0.3s ease;
  position: relative;
  z-index: 10;
}

.uml-viewer-page__sidebar.collapsed {
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

/* Sidebar Toggle Button (when collapsed) */
.uml-viewer-page__sidebar-toggle {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  background: white;
  border: 1px solid var(--border-color, #e0e0e0);
  border-radius: 6px;
  padding: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.uml-viewer-page__sidebar-toggle:hover {
  background: #ebefff;
  border-color: #0a3dfa;
  color: #0a3dfa;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(10, 61, 250, 0.2);
}

.uml-viewer-page__header {
  padding: 2rem 1.5rem 1.5rem;
  border-bottom: 1px solid var(--border-color, #e0e0e0);
  background: linear-gradient(135deg, #4a7dff 0%, #2c5ce6 100%);
  color: white;
  position: relative;
}

.uml-viewer-page__header-content {
  flex: 1;
}

.uml-viewer-page__collapse-button {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  padding: 0.5rem;
  cursor: pointer;
  color: white;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.uml-viewer-page__collapse-button:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
}

.uml-viewer-page__header-logo {
  margin-bottom: 1.5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1.5rem 1rem;
  background: white;
  border-radius: 8px;
  min-height: 120px; /* Ensure container is tall enough for full logo */
}

.uml-viewer-page__logo {
  height: 100px; /* Fixed height for SVG */
  width: auto;
  max-width: 100%; /* Ensure it fits within container width */
  display: block; /* Remove any inline spacing */
}

.uml-viewer-page__header h2 {
  margin: 0 0 0.5rem 0;
  font-size: 1.5rem;
  font-weight: 700;
}

.uml-viewer-page__subtitle {
  margin: 0;
  font-size: 0.875rem;
  opacity: 0.9;
}

/* Search Bar */
.uml-viewer-page__search {
  position: relative;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color, #e0e0e0);
  background: #f8f9fa;
}

.uml-viewer-page__search-icon {
  position: absolute;
  left: 2rem;
  top: 50%;
  transform: translateY(-50%);
  color: #666;
  pointer-events: none;
}

.uml-viewer-page__search-input {
  width: 100%;
  padding: 0.625rem 2.5rem 0.625rem 2.5rem;
  border: 1px solid var(--border-color, #e0e0e0);
  border-radius: 6px;
  font-size: 0.875rem;
  background: white;
  transition: all 0.2s;
}

.uml-viewer-page__search-input:focus {
  outline: none;
  border-color: #0a3dfa;
  box-shadow: 0 0 0 3px rgba(10, 61, 250, 0.1);
}

.uml-viewer-page__search-input::placeholder {
  color: #999;
}

.uml-viewer-page__search-clear {
  position: absolute;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: #999;
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.2s;
}

.uml-viewer-page__search-clear:hover {
  background: rgba(0, 0, 0, 0.05);
  color: #666;
}

.uml-viewer-page__files {
  flex: 1;
  padding: 1.5rem;
}

.uml-viewer-page__files > h3 {
  margin: 0 0 1rem 0;
  font-size: 1.125rem;
  color: #172a59;
  font-weight: 600;
}

.uml-viewer-page__count {
  margin-left: 0.5rem;
  font-size: 0.875rem;
  color: #666;
  font-weight: 400;
}

.uml-viewer-page__no-results {
  padding: 2rem 1rem;
  text-align: center;
  color: #666;
  font-size: 0.875rem;
  font-style: italic;
}

.uml-viewer-page__file-group {
  margin-bottom: 1.5rem;
}

.uml-viewer-page__file-group h4 {
  margin: 0 0 0.75rem 0;
  font-size: 0.875rem;
  color: #666;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.uml-viewer-page__file-button {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 1rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  text-align: left;
  font-size: 0.875rem;
  color: #172a59;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 0.5rem;
}

.uml-viewer-page__file-button:hover {
  background: #ebefff;
  border-color: #0a3dfa;
}

.uml-viewer-page__file-button.active {
  background: #0a3dfa;
  color: white;
  border-color: #0a3dfa;
}

.uml-viewer-page__file-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  stroke-width: 2;
}

.uml-viewer-page__info {
  padding: 1.5rem;
  background: #f8f9fa;
  border-top: 1px solid var(--border-color, #e0e0e0);
  font-size: 0.8125rem;
  color: #666;
}

.uml-viewer-page__info h4 {
  margin: 0 0 0.75rem 0;
  font-size: 0.875rem;
  color: #172a59;
  font-weight: 600;
}

.uml-viewer-page__info p {
  margin: 0 0 0.75rem 0;
  line-height: 1.5;
}

.uml-viewer-page__info ul {
  margin: 0;
  padding-left: 1.25rem;
  list-style-type: disc;
}

.uml-viewer-page__info li {
  margin: 0.25rem 0;
}

/* Main area */
.uml-viewer-page__main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Toolbar */
.uml-viewer-page__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: white;
  border-bottom: 1px solid var(--border-color, #e0e0e0);
  gap: 1rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  z-index: 5;
  position: relative;
}

.uml-viewer-page__toolbar-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.uml-viewer-page__toolbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.uml-viewer-page__toolbar-button {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: white;
  border: 1px solid var(--border-color, #e0e0e0);
  border-radius: 6px;
  font-size: 0.875rem;
  color: #172a59;
  cursor: pointer;
  transition: all 0.2s;
}

.uml-viewer-page__toolbar-button svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
}

.uml-viewer-page__toolbar-button:hover {
  background: #ebefff;
  border-color: #0a3dfa;
  color: #0a3dfa;
}

.uml-viewer-page__toolbar-button--secondary {
  background: #0a3dfa;
  color: white;
  border-color: #0a3dfa;
}

.uml-viewer-page__toolbar-button--secondary:hover {
  background: #083ab3;
  border-color: #083ab3;
  color: white;
}

.uml-viewer-page__diagram-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: #172a59;
}

/* Export Dropdown */
.uml-viewer-page__export-dropdown {
  position: relative;
}

.uml-viewer-page__dropdown-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  background: white;
  border: 1px solid var(--border-color, #e0e0e0);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  min-width: 240px;
  z-index: 100;
  overflow: hidden;
  animation: dropdownSlideIn 0.2s ease-out;
}

@keyframes dropdownSlideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.uml-viewer-page__dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  width: 100%;
  padding: 0.875rem 1rem;
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s;
  color: #172a59;
}

.uml-viewer-page__dropdown-item:hover {
  background: #f8f9fa;
}

.uml-viewer-page__dropdown-item svg {
  flex-shrink: 0;
  margin-top: 0.125rem;
  color: #666;
}

.uml-viewer-page__dropdown-item:hover svg {
  color: #0a3dfa;
}

.uml-viewer-page__dropdown-item-content {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.uml-viewer-page__dropdown-item-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: #172a59;
}

.uml-viewer-page__dropdown-item-description {
  font-size: 0.75rem;
  color: #666;
}

.uml-viewer-page__dropdown-divider {
  height: 1px;
  background: var(--border-color, #e0e0e0);
  margin: 0.25rem 0;
}

.uml-viewer-page__canvas {
  flex: 1;
  overflow: hidden;
}

/* Empty state */
.uml-viewer-page__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 2rem;
  text-align: center;
  color: #666;
}

.uml-viewer-page__empty-icon {
  width: 64px;
  height: 64px;
  stroke-width: 1.5;
  margin-bottom: 1rem;
  color: #0a3dfa;
  opacity: 0.3;
}

.uml-viewer-page__empty h3 {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
  color: #172a59;
}

.uml-viewer-page__empty p {
  margin: 0;
  font-size: 0.9375rem;
  color: #666;
}

/* Loading state */
.uml-viewer-page__loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 2rem;
}

.uml-viewer-page__spinner {
  width: 48px;
  height: 48px;
  border: 4px solid #ebefff;
  border-top-color: #0a3dfa;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}

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

.uml-viewer-page__loading p {
  margin: 0;
  color: #666;
  font-size: 0.9375rem;
}

/* Error state */
.uml-viewer-page__error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 2rem;
  text-align: center;
}

.uml-viewer-page__error-icon {
  width: 64px;
  height: 64px;
  stroke-width: 1.5;
  margin-bottom: 1rem;
  color: #dc3545;
}

.uml-viewer-page__error h3 {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
  color: #dc3545;
}

.uml-viewer-page__error p {
  margin: 0 0 1.5rem 0;
  font-size: 0.9375rem;
  color: #666;
  max-width: 500px;
}

.uml-viewer-page__retry-button {
  padding: 0.75rem 1.5rem;
  background: #0a3dfa;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.uml-viewer-page__retry-button:hover {
  background: #0832d1;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(10, 61, 250, 0.3);
}

/* Source code viewer */
.uml-viewer-page__source {
  border-top: 1px solid var(--border-color, #e0e0e0);
  background: white;
}

.uml-viewer-page__source details {
  padding: 0;
}

.uml-viewer-page__source summary {
  padding: 1rem 1.5rem;
  background: #f8f9fa;
  cursor: pointer;
  font-weight: 500;
  color: #172a59;
  user-select: none;
  transition: background 0.2s;
}

.uml-viewer-page__source summary:hover {
  background: #ebefff;
}

.uml-viewer-page__source pre {
  margin: 0;
  padding: 1.5rem;
  background: #1e1e1e;
  color: #d4d4d4;
  overflow-x: auto;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.8125rem;
  line-height: 1.5;
  max-height: 300px;
  overflow-y: auto;
}

.uml-viewer-page__source code {
  font-family: inherit;
}

/* Responsive */
@media (max-width: 1024px) {
  .uml-viewer-page {
    grid-template-columns: 280px 1fr;
  }
}

@media (max-width: 768px) {
  .uml-viewer-page {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .uml-viewer-page__sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-color, #e0e0e0);
    max-height: 40vh;
  }

  .uml-viewer-page__info {
    display: none;
  }
}

/* Layout Toggle */
.uml-viewer-page__layout-toggle {
  display: flex;
  gap: 0.5rem;
  margin-left: 1.5rem;
  padding-left: 1.5rem;
  border-left: 1px solid var(--border-color, #e0e0e0);
}

.uml-viewer-page__toolbar-button--active {
  background: #0a3dfa !important;
  color: white !important;
  border-color: #0a3dfa !important;
}

.uml-viewer-page__toolbar-button--active:hover {
  background: #083ab3 !important;
  border-color: #083ab3 !important;
}

/* Layout Dropdown */
.uml-viewer-page__layout-dropdown {
  position: relative;
  margin-left: 1.5rem;
  padding-left: 1.5rem;
  border-left: 1px solid var(--border-color, #e0e0e0);
}

.uml-viewer-page__dropdown-menu--layout {
  min-width: 320px;
  max-height: 500px;
  overflow-y: auto;
}

.uml-viewer-page__dropdown-header {
  padding: 0.75rem 1rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: #666;
  letter-spacing: 0.5px;
  background: #f8f9fa;
}

.uml-viewer-page__dropdown-divider {
  height: 1px;
  background: var(--border-color, #e0e0e0);
  margin: 0.5rem 0;
}

.uml-viewer-page__dropdown-item--active {
  background: #ebefff;
  border-left: 3px solid #0a3dfa;
}

.uml-viewer-page__dropdown-item--active:hover {
  background: #d4ddff;
}

.uml-viewer-page__dropdown-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-right: 0.75rem;
}

/* Load UML Data Section */
.uml-viewer-page__load-section {
  border-bottom: 1px solid var(--border-color, #e0e0e0);
}

.uml-viewer-page__load-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem 1.5rem;
  background: #f8f9fa;
  border: none;
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 500;
  color: #172a59;
  transition: background 0.2s;
}

.uml-viewer-page__load-header:hover {
  background: #ebefff;
}

.uml-viewer-page__load-header span {
  flex: 1;
  text-align: left;
}

.uml-viewer-page__load-chevron {
  transition: transform 0.2s;
}

.uml-viewer-page__load-chevron.expanded {
  transform: rotate(180deg);
}

.uml-viewer-page__load-content {
  padding: 1rem 1.5rem 1.5rem;
  background: white;
}

.uml-viewer-page__load-file {
  margin-bottom: 1rem;
}

.uml-viewer-page__load-file-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1rem;
  background: #f8f9fa;
  border: 2px dashed var(--border-color, #e0e0e0);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.875rem;
  color: #666;
  transition: all 0.2s;
}

.uml-viewer-page__load-file-label:hover {
  border-color: #4a7dff;
  background: #ebefff;
  color: #4a7dff;
}

.uml-viewer-page__load-file-input {
  display: none;
}

.uml-viewer-page__load-divider {
  display: flex;
  align-items: center;
  margin: 1rem 0;
  color: #999;
  font-size: 0.75rem;
}

.uml-viewer-page__load-divider::before,
.uml-viewer-page__load-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color, #e0e0e0);
}

.uml-viewer-page__load-divider span {
  padding: 0 0.75rem;
}

.uml-viewer-page__load-textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color, #e0e0e0);
  border-radius: 6px;
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 0.8125rem;
  line-height: 1.5;
  resize: vertical;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.uml-viewer-page__load-textarea:focus {
  outline: none;
  border-color: #4a7dff;
  box-shadow: 0 0 0 3px rgba(74, 125, 255, 0.1);
}

.uml-viewer-page__load-textarea::placeholder {
  color: #999;
  font-family: inherit;
}

.uml-viewer-page__load-button {
  width: 100%;
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: #4a7dff;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.uml-viewer-page__load-button:hover:not(:disabled) {
  background: #3a6de8;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(74, 125, 255, 0.3);
}

.uml-viewer-page__load-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}