/* Scoped CSS for latex-equation-renderer */
.ler-app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--color-text, #1e293b);
}

.ler-header {
  margin-bottom: 1.5rem;
}

.ler-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.ler-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  background-color: #e0e7ff;
  color: #3730a3;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ler-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin: 0;
  color: var(--color-heading, #0f172a);
}

.ler-subtitle {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text-muted, #64748b);
  line-height: 1.5;
}

/* Ad slots */
.ler-ad-slot-wrap {
  margin: 1.5rem 0;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-subtle, #f8fafc);
  border: 1px dashed var(--color-border, #e2e8f0);
  border-radius: 0.5rem;
}

/* Main Grid */
.ler-main-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 900px) {
  .ler-main-grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* Cards */
.ler-card {
  background: var(--color-surface, #ffffff);
  border: 1px solid var(--color-border, #e2e8f0);
  border-radius: 0.75rem;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  display: flex;
  flex-direction: column;
}

.ler-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border, #e2e8f0);
  padding-bottom: 0.75rem;
}

.ler-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-heading, #0f172a);
}

.ler-card-actions {
  display: flex;
  gap: 0.5rem;
}

/* Buttons */
.ler-btn-sm {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  color: #334155;
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.ler-btn-sm:hover {
  background: #e2e8f0;
}

.ler-btn-primary {
  background: #2563eb;
  border: 1px solid #1d4ed8;
  color: #ffffff;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.ler-btn-primary:hover {
  background: #1d4ed8;
}

.ler-btn-secondary {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  color: #1e293b;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.ler-btn-secondary:hover {
  background: #f1f5f9;
}

/* Form groups */
.ler-form-group {
  margin-bottom: 1.25rem;
}

.ler-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #334155;
}

.ler-select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  font-size: 0.9rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.375rem;
  background: #ffffff;
  color: #1e293b;
  outline: none;
}

.ler-select:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Toolbar & Tabs */
.ler-toolbar-container {
  margin-bottom: 1.25rem;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  overflow: hidden;
  background: #f8fafc;
}

.ler-toolbar-tabs {
  display: flex;
  border-bottom: 1px solid #e2e8f0;
  background: #f1f5f9;
  overflow-x: auto;
}

.ler-tab-btn {
  background: transparent;
  border: none;
  padding: 0.45rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #64748b;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
}

.ler-tab-btn:hover {
  color: #1e293b;
}

.ler-tab-btn.active {
  color: #2563eb;
  border-bottom-color: #2563eb;
  background: #ffffff;
}

.ler-tab-contents {
  padding: 0.5rem;
}

.ler-tab-pane {
  display: none;
  grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
  gap: 0.35rem;
}

.ler-tab-pane.active {
  display: grid;
}

.ler-symbol-btn {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 0.25rem;
  padding: 0.4rem 0.2rem;
  font-size: 0.95rem;
  font-family: 'Times New Roman', serif;
  color: #1e293b;
  cursor: pointer;
  text-align: center;
  transition: background 0.1s, border-color 0.1s;
}

.ler-symbol-btn:hover {
  background: #e0e7ff;
  border-color: #818cf8;
  color: #312e81;
}

/* Textarea & syntax meta */
.ler-textarea {
  width: 100%;
  box-sizing: border-box;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.95rem;
  padding: 0.75rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.375rem;
  background: #fcfdfd;
  color: #0f172a;
  resize: vertical;
  line-height: 1.4;
  outline: none;
}

.ler-textarea:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.ler-input-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 0.35rem;
  font-size: 0.8rem;
}

.ler-syntax-ok {
  color: #16a34a;
  font-weight: 500;
}

.ler-syntax-err {
  color: #dc2626;
  font-weight: 500;
}

.ler-char-count {
  color: #94a3b8;
}

/* Style settings */
.ler-style-settings {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid #e2e8f0;
}

.ler-style-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.ler-sublabel {
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ler-subselect {
  padding: 0.4rem 0.5rem;
  font-size: 0.8rem;
  border: 1px solid #cbd5e1;
  border-radius: 0.375rem;
  background: #ffffff;
  color: #1e293b;
}

/* Right Section: Preview Viewport */
.ler-preview-viewport {
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  padding: 2rem 1.5rem;
  box-sizing: border-box;
  overflow-x: auto;
  position: relative;
  transition: background-color 0.2s ease;
}

.ler-rendered-box {
  display: inline-block;
  text-align: center;
  max-width: 100%;
}

.ler-mathml-output {
  font-family: 'Cambria Math', 'Latin Modern Math', 'STIX Two Math', 'Times New Roman', serif;
  font-size: 28px;
  user-select: text;
  display: inline-block;
}

/* Copy bar */
.ler-copy-bar {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid #e2e8f0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ler-copy-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: #475569;
}

.ler-copy-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.ler-copy-btn {
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  color: #334155;
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.ler-copy-btn:hover {
  background: #e0e7ff;
  border-color: #818cf8;
  color: #2563eb;
}

.ler-copy-feedback {
  min-height: 1.2rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #16a34a;
}

.ler-copy-success {
  color: #16a34a;
}

/* Details & code blocks */
.ler-markup-details {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.ler-details {
  border: 1px solid #e2e8f0;
  border-radius: 0.375rem;
  background: #f8fafc;
  font-size: 0.8rem;
}

.ler-summary {
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-weight: 600;
  color: #475569;
}

.ler-code-block {
  margin: 0;
  padding: 0.75rem;
  background: #0f172a;
  color: #e2e8f0;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.75rem;
  overflow-x: auto;
  border-bottom-left-radius: 0.375rem;
  border-bottom-right-radius: 0.375rem;
}

.latex-equation {
  display: block;
  text-align: center;
  margin: 1rem 0;
}

.ler-editor-section {
  position: relative;
}

.ler-preview-section {
  position: relative;
}