/**
 * Barcodes Generator - Components CSS
 * Glassmorphism cards, 3D tilt micro-interactions, buttons, form controls,
 * tool preview workspace, cookie banner, FAQ accordion, blog components.
 */

/* Glassmorphism Cards */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-6);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.glass-card:hover {
  box-shadow: var(--shadow-xl);
  border-color: rgba(var(--color-primary-rgb), 0.3);
}

/* 3D Tilt Card (vanilla JS micro-interaction) */
.tilt-card {
  position: relative;
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.15s ease-out, box-shadow 0.25s ease;
}

.tilt-inner {
  transform: translateZ(20px);
}

@media (prefers-reduced-motion: reduce) {
  .tilt-card {
    transform: none !important;
  }
}

/* Tool Cards Grid */
.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}

@media (min-width: 640px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.tool-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  text-decoration: none;
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.tool-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(var(--color-primary-rgb), 0.1);
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
  font-size: var(--text-2xl);
  flex-shrink: 0;
}

.tool-card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.tool-card-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  flex-grow: 1;
  margin-bottom: var(--spacing-4);
  line-height: 1.5;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn:active {
  transform: scale(0.98);
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(16, 185, 129, 0.25);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-primary-hover);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
}

.btn-secondary {
  background-color: var(--bg-surface-subtle);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background-color: var(--border-color);
  color: var(--text-main);
}

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

.btn-outline:hover,
.btn-outline:focus-visible {
  background-color: rgba(var(--color-primary-rgb), 0.1);
  color: var(--color-primary-hover);
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: var(--text-xs);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: var(--text-base);
}

.btn-block {
  width: 100%;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.6rem;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-full);
}

.badge-primary {
  background: rgba(var(--color-primary-rgb), 0.12);
  color: var(--color-primary);
  border: 1px solid rgba(var(--color-primary-rgb), 0.25);
}

.badge-secondary {
  background: rgba(var(--color-secondary-rgb), 0.12);
  color: var(--color-secondary);
  border: 1px solid rgba(var(--color-secondary-rgb), 0.25);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* Form Controls */
.form-group {
  margin-bottom: var(--spacing-4);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--text-subtle);
  margin-top: 0.25rem;
}

.form-control,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-size: var(--text-sm);
  color: var(--text-main);
  background-color: var(--bg-surface-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.2);
}

.form-range {
  width: 100%;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-3);
}

@media (min-width: 640px) {
  .form-row-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .form-row-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Tool Interactive Workspace Layout */
.tool-workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-10);
}

@media (min-width: 992px) {
  .tool-workspace {
    grid-template-columns: 1.15fr 1fr;
    align-items: start;
  }
}

.tool-controls-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
}

.tool-preview-sticky {
  position: sticky;
  top: 92px;
}

.tool-preview-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.preview-canvas-box {
  background: #ffffff;
  border: 2px dashed #cbd5e1;
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
  min-height: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-4);
  overflow: auto;
  position: relative;
}

.preview-actions-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: var(--spacing-4);
}

/* Alert Notification Boxes */
.alert {
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-4);
  font-size: var(--text-sm);
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  line-height: 1.5;
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.12);
  color: #b91c1c;
  border: 1px solid rgba(239, 68, 68, 0.3);
}
:root[data-theme="dark"] .alert-danger {
  color: #fca5a5;
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.12);
  color: #047857;
  border: 1px solid rgba(16, 185, 129, 0.3);
}
:root[data-theme="dark"] .alert-success {
  color: #6ee7b7;
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.12);
  color: #b45309;
  border: 1px solid rgba(245, 158, 11, 0.3);
}
:root[data-theme="dark"] .alert-warning {
  color: #fde68a;
}

.alert-info {
  background-color: rgba(2, 132, 199, 0.12);
  color: #0369a1;
  border: 1px solid rgba(2, 132, 199, 0.3);
}
:root[data-theme="dark"] .alert-info {
  color: #7dd3fc;
}

/* FAQ Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  margin: var(--spacing-6) 0;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-surface);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.is-open {
  border-color: var(--color-primary);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1rem 1.25rem;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-main);
  cursor: pointer;
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--text-subtle);
  transition: transform var(--transition-fast);
}

.faq-item.is-open .faq-icon {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-answer {
  display: none;
  padding: 0 1.25rem 1.25rem 1.25rem;
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.faq-item.is-open .faq-answer {
  display: block;
}

/* Cookie Consent Floating Banner */
.cookie-banner {
  position: fixed;
  bottom: 1.25rem;
  left: 1.25rem;
  right: 1.25rem;
  max-width: 900px;
  margin: 0 auto;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: var(--spacing-5) var(--spacing-6);
  box-shadow: var(--shadow-xl);
  z-index: 9000;
  display: none;
  flex-direction: column;
  gap: var(--spacing-4);
  animation: slideUp 0.3s ease-out;
}

.cookie-banner.is-active {
  display: flex;
}

@media (min-width: 768px) {
  .cookie-banner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.cookie-text {
  font-size: var(--text-sm);
  color: var(--text-main);
  line-height: 1.5;
}

.cookie-text a {
  color: var(--color-primary);
  text-decoration: underline;
}

.cookie-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

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

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1.25rem;
  font-size: var(--text-sm);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: toastIn 0.25s ease-out;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll Reveal Animations */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal-on-scroll.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal-on-scroll {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ==========================================================================
   Bulk Generator & Avery Sheet Custom Layout Styles
   ========================================================================== */
.bulk-layout-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
}

@media (min-width: 1024px) {
  .bulk-layout-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.tool-tabs {
  display: flex;
  gap: var(--spacing-2);
  border-bottom: 2px solid var(--border-color);
  margin-bottom: var(--spacing-6);
}

.tab-btn {
  padding: var(--spacing-3) var(--spacing-5);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.upload-dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-8) var(--spacing-4);
  text-align: center;
  cursor: pointer;
  background: var(--bg-surface);
  transition: all var(--transition-fast);
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
  border-color: var(--color-primary);
  background: var(--bg-surface-elevated);
}

.dropzone-text {
  font-size: var(--text-base);
  margin: var(--spacing-3) 0 var(--spacing-1);
  color: var(--text-main);
}

.dropzone-sub {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.file-hidden-input {
  display: none;
}

.file-info-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-3) var(--spacing-4);
  margin-top: var(--spacing-4);
}

.btn-remove-file {
  background: none;
  border: none;
  color: var(--color-error);
  font-size: var(--text-xl);
  cursor: pointer;
  line-height: 1;
}

.sample-actions {
  display: flex;
  gap: var(--spacing-3);
  margin-top: var(--spacing-2);
}

.bulk-settings-box {
  margin-top: var(--spacing-6);
  padding-top: var(--spacing-6);
  border-top: 1px solid var(--border-color);
}

.settings-title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--spacing-4);
}

.bulk-action-row {
  margin-top: var(--spacing-6);
}

.bulk-action-row .btn {
  width: 100%;
}

.bulk-progress-wrap {
  margin-top: var(--spacing-4);
  background: var(--bg-surface-elevated);
  padding: var(--spacing-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.progress-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--spacing-2);
}

.progress-track {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.15s ease-out;
}

.preview-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-3);
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--spacing-4);
}

.preview-panel-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin: 0;
}

.bulk-grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: var(--spacing-3);
  max-height: 480px;
  overflow-y: auto;
  padding: var(--spacing-2);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.bulk-preview-card {
  background: #ffffff;
  color: #1e293b;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-sm);
  padding: var(--spacing-2);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.preview-item-title {
  font-size: 9px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 2px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.preview-item-price {
  font-size: 9px;
  font-weight: 700;
  color: #047857;
  margin-top: 2px;
}

.preview-canvas-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
}

.preview-canvas-wrap canvas {
  max-width: 100% !important;
  height: auto !important;
}

.bulk-empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-12) var(--spacing-4);
  color: var(--text-muted);
}

.bulk-empty-state svg {
  margin-bottom: var(--spacing-3);
  opacity: 0.5;
}

.preview-pagination-info {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-align: center;
  margin-top: var(--spacing-2);
}

.preview-err-text {
  font-size: 8px;
  color: var(--color-error);
  font-weight: 600;
}

/* ==========================================================================
   Avery Sheet Designer & Visualizer Styles
   ========================================================================== */
.template-spec-callout {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-3) var(--spacing-4);
  margin-top: var(--spacing-2);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.spec-row {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.spec-row strong {
  color: var(--text-main);
}

.avery-action-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  margin-top: var(--spacing-6);
}

.single-label-zoom {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-3);
  margin-bottom: var(--spacing-4);
}

.zoom-tag {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: var(--spacing-2);
}

.zoom-card-body {
  background: #ffffff;
  color: #0f172a;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-sm);
  padding: var(--spacing-3);
  text-align: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.zoom-title {
  font-size: 11px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 4px;
}

.zoom-subtext {
  font-size: 11px;
  font-weight: 700;
  color: #047857;
  margin-top: 4px;
}

.zoom-canvas-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
}

.zoom-canvas-wrap canvas {
  max-width: 100% !important;
  height: auto !important;
}

.sheet-visualizer-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-4);
  display: flex;
  justify-content: center;
  align-items: center;
}

.sheet-grid-visualizer {
  display: grid;
  gap: 3px;
  width: 100%;
  max-width: 320px;
  aspect-ratio: 8.5 / 11;
  background: #ffffff;
  padding: 8px 6px;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.visual-sheet-cell {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 8px;
  color: #94a3b8;
  position: relative;
  overflow: hidden;
  transition: all 0.15s ease;
}

.visual-sheet-cell.active {
  background: #ecfdf5;
  border-color: #10b981;
}

.visual-sheet-cell.active .cell-bar-sim {
  display: block;
  width: 65%;
  height: 50%;
  background: repeating-linear-gradient(90deg, #0f172a 0px, #0f172a 2px, transparent 2px, transparent 3px);
}

.visual-sheet-cell.skipped {
  background: #fef2f2;
  border-color: #f87171;
  color: #ef4444;
  font-weight: 700;
}

.visual-sheet-cell.empty {
  background: #f8fafc;
  border: 1px dashed #e2e8f0;
}

.sheet-legend-note {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--spacing-3);
}

.legend-box {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  vertical-align: middle;
  margin-right: 4px;
}

.legend-box.active-box {
  background: #ecfdf5;
  border: 1px solid #10b981;
}

.legend-box.skipped-box {
  background: #fef2f2;
  border: 1px solid #f87171;
}

.legend-box.empty-box {
  background: #f8fafc;
  border: 1px dashed #cbd5e1;
}

/* ==========================================================================
   Blog System Styles (Index, Article, TOC, Cards, Author, Share)
   ========================================================================== */
.blog-filters-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-8);
  padding-bottom: var(--spacing-6);
  border-bottom: 1px solid var(--border-color);
}

.category-pills-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.cat-pill {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cat-pill:hover,
.cat-pill.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.blog-search-box {
  position: relative;
  min-width: 260px;
}

.blog-search-box input {
  padding-left: 2.25rem;
}

.blog-search-box svg {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.blog-posts-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
}

@media (min-width: 640px) {
  .blog-posts-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .blog-posts-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.blog-post-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-normal);
  text-decoration: none;
  color: inherit;
}

.blog-post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
  text-decoration: none;
}

.blog-card-thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--bg-surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-4);
  position: relative;
}

.blog-card-thumb svg {
  max-width: 100%;
  max-height: 100%;
}

.blog-card-body {
  padding: var(--spacing-5);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--spacing-2);
}

.blog-card-title {
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: var(--spacing-2);
  color: var(--text-main);
  transition: color var(--transition-fast);
}

.blog-post-card:hover .blog-card-title {
  color: var(--color-primary);
}

.blog-card-excerpt {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: var(--spacing-4);
  flex: 1;
}

.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-3);
  margin-top: auto;
}

/* Individual Post Layout */
.article-header {
  text-align: center;
  max-width: 840px;
  margin: 0 auto var(--spacing-8);
}

.article-hero-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: var(--spacing-4) 0;
  color: var(--text-main);
}

@media (min-width: 768px) {
  .article-hero-title {
    font-size: var(--text-4xl);
  }
}

.article-meta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.article-hero-graphic {
  max-width: 840px;
  margin: 0 auto var(--spacing-10);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

.article-hero-graphic svg {
  max-width: 100%;
  height: auto;
}

.article-caption {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: var(--spacing-3);
  text-align: center;
  font-style: italic;
}

/* Table of Contents */
.toc-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5) var(--spacing-6);
  margin: var(--spacing-8) 0;
}

.toc-title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-top: 0;
  margin-bottom: var(--spacing-3);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 0.5rem;
  font-size: var(--text-sm);
}

.toc-list a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.toc-list a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.toc-list .toc-sublist {
  padding-left: 1.25rem;
  margin-top: 0.35rem;
  list-style: disc;
}

/* Inline Diagram Box */
.inline-diagram-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  margin: var(--spacing-6) 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.inline-diagram-box svg {
  max-width: 100%;
  height: auto;
}

/* Author Box */
.author-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-5);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-6);
  margin: var(--spacing-10) 0;
}

.author-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  font-weight: 700;
  flex-shrink: 0;
}

.author-info h4 {
  margin: 0 0 0.25rem;
  font-size: var(--text-base);
}

.author-bio {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

/* Privacy-friendly Share Bar */
.share-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  padding: var(--spacing-4) 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  margin: var(--spacing-8) 0;
}

.share-links-group {
  display: flex;
  gap: var(--spacing-2);
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.share-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}