/* ══════════════════════════════════════
   Drop Zone
   ══════════════════════════════════════ */
.drop-zone {
  width: 100%;
  max-width: 640px;
  padding: 80px 48px;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: border-color var(--transition), background-color var(--transition), transform var(--transition);
  background: var(--color-surface);
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 5%, var(--color-surface));
  transform: scale(1.01);
}

.drop-zone__icon {
  font-size: 3rem;
  margin-bottom: 16px;
  color: var(--color-text-secondary);
  animation: dropzone-float 3s ease-in-out infinite;
}

.drop-zone__icon svg,
.drop-zone__icon img {
  display: inline-block;
  max-width: 100%;
}

@keyframes dropzone-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.drop-zone__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.drop-zone__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.drop-zone__browse {
  display: inline-block;
  padding: 10px 24px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: background-color var(--transition);
}

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

/* ══════════════════════════════════════
   Diagram Card
   ══════════════════════════════════════ */
.diagram-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: box-shadow var(--transition), background-color 0.3s, border-color 0.3s;
}

.diagram-card:hover {
  box-shadow: var(--shadow-lg);
}

/* Card entry animation */
.diagram-card--enter {
  animation: card-enter 0.4s ease both;
}

@keyframes card-enter {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.diagram-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-hover);
}

.diagram-card__title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.diagram-card__actions {
  display: flex;
  gap: 4px;
}

.diagram-card__body {
  padding: 16px;
  overflow-x: auto;
  display: flex;
  justify-content: center;
}

.diagram-card__body svg {
  width: 100%;
  height: auto;
}

.diagram-card__error {
  padding: 16px;
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-sm);
  margin: 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-error);
  white-space: pre-wrap;
}

/* ── Inline Code Editor ── */
.diagram-card__editor {
  display: none;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-background);
}

.diagram-card__editor.open {
  display: block;
}

.diagram-card__editor-split {
  display: flex;
  gap: 0;
}

.diagram-card__mini-palette {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 6px;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
  flex-shrink: 0;
}

.mini-palette__item {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  cursor: grab;
  transition: all var(--transition);
  color: var(--color-text-secondary);
}

.mini-palette__item:hover {
  background: var(--color-surface-hover);
  color: var(--color-primary);
}

.mini-palette__item.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.diagram-card__textarea {
  flex: 1;
  min-height: 140px;
  max-height: 300px;
  padding: 12px 16px;
  border: none;
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  transition: background-color 0.3s, color 0.3s;
}

.diagram-card__textarea.drag-over {
  background: color-mix(in srgb, var(--color-primary) 8%, var(--color-background));
  outline: 2px dashed var(--color-primary);
  outline-offset: -2px;
}

.diagram-card__editor-actions {
  display: flex;
  gap: 8px;
  padding: 8px 12px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.diagram-card__editor-actions .btn {
  font-size: 0.75rem;
  padding: 5px 14px;
}

/* ══════════════════════════════════════
   Buttons
   ══════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  user-select: none;
}

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

.btn:active {
  transform: scale(0.96);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

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

.btn--icon {
  padding: 6px 8px;
  border: none;
  background: transparent;
}

.btn--icon:hover {
  background: var(--color-surface-hover);
  border-radius: var(--radius-sm);
}

.btn--icon.active {
  color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 10%, transparent);
}

.btn--copied {
  color: var(--color-success);
}

/* ══════════════════════════════════════
   Filter Bar
   ══════════════════════════════════════ */
.filter-btn {
  padding: 5px 14px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
}

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

.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* ══════════════════════════════════════
   Shape Palette Panel
   ══════════════════════════════════════ */
.shape-panel__hint {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.palette-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.palette-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: grab;
  transition: all var(--transition);
}

.palette-item:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-hover);
}

.palette-item.dragging {
  opacity: 0.4;
  cursor: grabbing;
}

.palette-item__icon {
  width: 32px;
  height: 32px;
  color: var(--color-text);
}

.palette-item__label {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-text);
}

.palette-item__desc {
  font-size: 0.625rem;
  color: var(--color-text-secondary);
}

.palette-arrow-grid {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.palette-arrow-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: grab;
  transition: all var(--transition);
  font-size: 0.75rem;
}

.palette-arrow-item:hover {
  border-color: var(--color-primary);
}

.palette-arrow-item.dragging {
  opacity: 0.4;
}

.palette-arrow-item__symbol {
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-primary);
}

.palette-arrow-item__desc {
  color: var(--color-text-secondary);
  font-size: 0.6875rem;
}

/* ══════════════════════════════════════
   Theme Panel Components
   ══════════════════════════════════════ */
.theme-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.theme-panel__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0;
}

/* Theme Panel Overlay */
.theme-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0);
  z-index: 85;
  pointer-events: none;
  transition: background 0.3s ease;
}

.theme-overlay.open {
  background: rgba(0, 0, 0, 0.3);
  pointer-events: auto;
}

/* Preset Theme Grid */
.theme-preset-section {
  margin-bottom: 8px;
}

.theme-preset-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.theme-preset-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 6px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: pointer;
  transition: all var(--transition);
}

.theme-preset-card:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-hover);
}

.theme-preset-card.active {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 10%, var(--color-surface));
  box-shadow: 0 0 0 1px var(--color-primary);
}

.theme-preset-preview {
  display: flex;
  gap: 4px;
}

.theme-preset-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.12);
  flex-shrink: 0;
}

:root.dark .theme-preset-dot {
  border-color: rgba(255,255,255,0.15);
}

.theme-preset-name {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

/* Divider */
.theme-divider {
  display: flex;
  align-items: center;
  margin: 16px 0 12px;
  gap: 10px;
}

.theme-divider::before,
.theme-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.theme-divider__label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.theme-group {
  margin-bottom: 20px;
}

.theme-group__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.theme-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0;
}

.theme-row__label {
  font-size: 0.8125rem;
  color: var(--color-text);
}

.theme-row input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 32px;
  height: 32px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: none;
  padding: 2px;
}

.theme-row input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

.theme-row input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: 3px;
}

/* ══════════════════════════════════════
   Export Options
   ══════════════════════════════════════ */
.export-options {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  margin-bottom: 20px;
  background: var(--color-surface-hover);
  border-radius: var(--radius-sm);
}

.export-options label {
  font-size: 0.8125rem;
  color: var(--color-text);
}

.export-options select {
  padding: 4px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.8125rem;
}

/* ══════════════════════════════════════
   Toast
   ══════════════════════════════════════ */
.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  color: var(--color-text);
  animation: toast-in 0.3s ease;
  max-width: 360px;
}

.toast__icon {
  display: flex;
  flex-shrink: 0;
}

.toast__text {
  flex: 1;
}

.toast--error {
  border-color: var(--color-error);
  color: var(--color-error);
}

.toast--success {
  border-color: var(--color-success);
  color: var(--color-success);
}

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

/* ══════════════════════════════════════
   Fullscreen Modal
   ══════════════════════════════════════ */
.fullscreen-modal {
  position: fixed;
  inset: 0;
  z-index: 400;
  background: var(--color-background);
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.fullscreen-modal.open {
  opacity: 1;
  pointer-events: auto;
}

.fullscreen-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  flex-shrink: 0;
}

.fullscreen-modal__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.fullscreen-modal__close {
  color: var(--color-text-secondary);
}

.fullscreen-modal__close:hover {
  color: var(--color-text);
}

.fullscreen-modal__body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  overflow: auto;
}

.fullscreen-modal__body svg {
  max-width: 100%;
  max-height: 100%;
}

/* ══════════════════════════════════════
   Spinner Overlay
   ══════════════════════════════════════ */
.spinner-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ══════════════════════════════════════
   ASCII Diagram Rendering
   ══════════════════════════════════════ */
.diagram-card--ascii .diagram-card__body {
  justify-content: flex-start;
}

.diagram-card__body--ascii {
  padding: 0;
  overflow-x: auto;
}

.diagram-card__badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 10px;
  background: color-mix(in srgb, var(--color-primary) 15%, transparent);
  color: var(--color-primary);
}

.ascii-render {
  width: 100%;
  overflow-x: auto;
}

.ascii-render__pre {
  margin: 0;
  padding: 20px 24px;
  font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  white-space: pre;
  overflow-x: auto;
  color: var(--color-text-secondary);
  background: var(--color-background);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.ascii-box {
  color: var(--color-primary);
  font-weight: 600;
}

.ascii-arrow {
  color: #F59E0B;
  font-weight: 700;
}

.ascii-text {
  color: var(--color-text);
}

.ascii-domain {
  color: #8B5CF6;
  font-weight: 500;
}

.ascii-tech {
  color: #10B981;
  font-weight: 600;
}

.ascii-section {
  color: #EC4899;
  font-weight: 700;
  text-transform: uppercase;
}

.ascii-label {
  color: #F97316;
  font-weight: 500;
}

/* Dark mode adjustments */
:root.dark .ascii-box {
  color: #60A5FA;
}

:root.dark .ascii-arrow {
  color: #FBBF24;
}

:root.dark .ascii-domain {
  color: #A78BFA;
}

:root.dark .ascii-tech {
  color: #34D399;
}

:root.dark .ascii-section {
  color: #F472B6;
}

:root.dark .ascii-label {
  color: #FB923C;
}

/* Fullscreen ASCII */
.ascii-render--fullscreen .ascii-render__pre {
  font-size: 1rem;
  line-height: 1.6;
  padding: 40px;
  border-radius: var(--radius-md);
}