/**
 * Utility Seva — Image to Base64 Converter Stylesheet
 * Strict Compact UI Layout (< 768px screen height support).
 * Fully responsive across desktop, tablet, and mobile with Dark Mode.
 */

/* ==========================================================================
   1. Header & Navigation (Utility Seva Standard Header Integration)
   ========================================================================== */
.site-header .nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}

.site-header .theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  padding: 0;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.site-header .theme-toggle-btn:hover {
  background-color: var(--bg-surface-alt);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.site-header .theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  display: block;
  flex-shrink: 0;
  margin: auto;
  stroke: currentColor;
  stroke-width: 2;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header .theme-toggle-btn .sun-icon {
  display: none;
}

.site-header .theme-toggle-btn .moon-icon {
  display: block;
}

html[data-theme="dark"] .site-header .theme-toggle-btn .sun-icon,
html.dark .site-header .theme-toggle-btn .sun-icon {
  display: block;
}

html[data-theme="dark"] .site-header .theme-toggle-btn .moon-icon,
html.dark .site-header .theme-toggle-btn .moon-icon {
  display: none;
}

/* ==========================================================================
   2. Main Container & Top Bar
   ========================================================================== */
.converter-main {
  min-height: calc(100vh - var(--nav-height) - 80px);
  padding: 0.5rem 0 1rem 0;
  background-color: var(--bg-body);
}

.converter-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.45rem;
}

.breadcrumb-nav-compact {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-bottom: 0.1rem;
}

.breadcrumb-nav-compact a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-nav-compact a:hover {
  color: var(--brand-600);
}

.converter-title-row {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.converter-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

.tool-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.12rem 0.48rem;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background-color: rgba(16, 185, 129, 0.12);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.25);
  line-height: 1.3;
}

.converter-subtitle {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin: 0.1rem 0 0 0;
  line-height: 1.3;
}

/* Alert Notification Banner */
.converter-alert {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.7rem;
  margin-bottom: 0.45rem;
  border-radius: var(--radius-md);
  background-color: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: #ef4444;
  font-size: 0.78rem;
  font-weight: 500;
  animation: fadeIn 0.2s ease;
}

.converter-alert svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

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

/* Common Ghost Button */
.btn-ghost-sm {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.15rem 0.45rem;
  font-size: 0.72rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-ghost-sm:hover {
  background-color: var(--bg-surface-alt);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

/* ==========================================================================
   3. Previews Comparison Grid (Compact 2-Column: Left/Right)
   ========================================================================== */
.previews-comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  align-items: stretch;
}

.preview-panel-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 0.5rem 0.65rem;
  display: flex;
  flex-direction: column;
  gap: 0.38rem;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.panel-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.28rem;
  gap: 0.5rem;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.panel-title svg {
  width: 15px;
  height: 15px;
  color: var(--brand-500);
}

.panel-header-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* ==========================================================================
   4. Left Panel: Stage with Transparency Checkerboard & Dropzone
   ========================================================================== */
.image-preview-stage {
  position: relative;
  width: 100%;
  height: 195px;
  max-height: 200px;
  border-radius: var(--radius-sm);
  background-color: #f0f7ff;
  border: 1px solid #d0e3ff;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.stage-checkerboard {
  background-color: #f8fafc;
  background-image: 
    linear-gradient(45deg, rgba(0, 0, 0, 0.05) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0, 0, 0, 0.05) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0, 0, 0, 0.05) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0, 0, 0, 0.05) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

html[data-theme="dark"] .stage-checkerboard,
html.dark .stage-checkerboard {
  background-color: #0b1120;
  border-color: #1e293b;
  background-image: 
    linear-gradient(45deg, rgba(255, 255, 255, 0.04) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255, 255, 255, 0.04) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255, 255, 255, 0.04) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255, 255, 255, 0.04) 75%);
}

.upload-dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  width: 100%;
  height: 100%;
  padding: 0.5rem;
  cursor: pointer;
  outline: none;
  transition: background-color var(--transition-fast);
}

.upload-dropzone:hover,
.upload-dropzone.drag-active {
  background-color: rgba(99, 102, 241, 0.08);
}

.upload-icon-circle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background-color: #ffffff;
  color: var(--brand-600);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(59, 130, 246, 0.15);
  margin-bottom: 0.35rem;
}

html[data-theme="dark"] .upload-icon-circle,
html.dark .upload-icon-circle {
  background-color: #1e293b;
  color: var(--brand-400);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.upload-primary-text {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.1rem;
}

.upload-sub-text {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
}

.btn-browse-photo {
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: var(--brand-600);
  color: #ffffff;
  border: none;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(99, 102, 241, 0.25);
  transition: all var(--transition-fast);
}

.btn-browse-photo:hover {
  background-color: var(--brand-700);
}

.preview-img-wrap {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
}

.preview-rendered-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 2px;
  display: block;
}

.processing-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  backdrop-filter: blur(2px);
  z-index: 10;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.25);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* ==========================================================================
   5. Right Panel: Mode Bar, Monospace Textarea, & Action Bar
   ========================================================================== */
.output-header-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Mode Selector Bar */
.base64-mode-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.15rem 0;
}

.mode-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.mode-pills-row {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.mode-pill-btn {
  padding: 0.2rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1.2;
}

.mode-pill-btn:hover {
  background-color: var(--bg-surface-hover, #e2e8f0);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

html[data-theme="dark"] .mode-pill-btn:hover,
html.dark .mode-pill-btn:hover {
  background-color: #334155;
  color: #ffffff;
}

.mode-pill-btn.active {
  background-color: var(--brand-600);
  border-color: var(--brand-600);
  color: #ffffff;
  box-shadow: 0 1px 3px rgba(99, 102, 241, 0.3);
}

/* Textarea Box & Copy Toast */
.output-textarea-wrap {
  position: relative;
  width: 100%;
}

.base64-textarea {
  width: 100%;
  height: 155px;
  max-height: 160px;
  padding: 0.45rem 0.6rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.72rem;
  line-height: 1.35;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-alt);
  color: var(--text-primary);
  outline: none;
  resize: none;
  overflow-y: auto;
  word-break: break-all;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.base64-textarea:focus {
  border-color: var(--brand-500);
}

/* Custom Scrollbar for Textarea */
.base64-textarea::-webkit-scrollbar {
  width: 6px;
}
.base64-textarea::-webkit-scrollbar-track {
  background: transparent;
}
.base64-textarea::-webkit-scrollbar-thumb {
  background-color: rgba(148, 163, 184, 0.4);
  border-radius: 3px;
}
.base64-textarea::-webkit-scrollbar-thumb:hover {
  background-color: rgba(148, 163, 184, 0.7);
}

/* Floating Feedback Toast */
.copy-feedback-toast {
  position: absolute;
  top: 8px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.22rem 0.6rem;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: rgba(16, 185, 129, 0.95);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  animation: fadeIn 0.15s ease;
  pointer-events: none;
  z-index: 5;
}

/* ==========================================================================
   6. Meta Stats Cards & Badges
   ========================================================================== */
.meta-stats-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.22rem 0.5rem;
  font-size: 0.7rem;
  color: var(--text-secondary);
  gap: 0.4rem;
}

.meta-pills-wrap {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.meta-format-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.05rem 0.35rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  white-space: nowrap;
}

.savings-badge-neutral {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
}

.savings-badge-good {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--success);
}

.savings-badge-warn {
  font-size: 0.68rem;
  font-weight: 700;
  color: #f59e0b;
}

/* ==========================================================================
   7. Action Buttons Bar
   ========================================================================== */
.base64-action-bar {
  display: grid;
  grid-template-columns: 1.4fr 1.2fr 0.9fr;
  gap: 0.4rem;
  align-items: center;
  margin-top: 0.1rem;
}

.btn-action-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.38rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: var(--brand-600);
  color: #ffffff;
  border: none;
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(99, 102, 241, 0.3);
  transition: all var(--transition-fast);
}

.btn-action-primary svg {
  width: 15px;
  height: 15px;
}

.btn-action-primary:hover:not(:disabled) {
  background-color: var(--brand-700);
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.4);
}

.btn-action-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-action-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.38rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-action-secondary svg {
  width: 15px;
  height: 15px;
  color: var(--brand-500);
}

.btn-action-secondary:hover:not(:disabled) {
  background-color: var(--bg-surface-alt);
  border-color: var(--border-color-hover);
}

.btn-action-secondary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-action-ghost {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.38rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-action-ghost svg {
  width: 15px;
  height: 15px;
}

.btn-action-ghost:hover:not(:disabled) {
  background-color: var(--bg-surface-alt);
  color: var(--text-primary);
  border-color: var(--border-color-hover);
}

.btn-action-ghost:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* ==========================================================================
   8. Informational Guidance Cards Section
   ========================================================================== */
.converter-guidance-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-top: 0.75rem;
}

.guidance-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  box-shadow: var(--shadow-sm);
}

.guidance-card-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.guidance-card-title svg {
  width: 16px;
  height: 16px;
  color: var(--brand-500);
}

.guidance-card ul {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.guidance-card li {
  margin-bottom: 0.25rem;
}

.guidance-card code {
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.7rem;
  padding: 0.05rem 0.25rem;
  border-radius: 3px;
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  color: var(--brand-600);
}

html[data-theme="dark"] .guidance-card code,
html.dark .guidance-card code {
  color: var(--brand-400);
}

/* ==========================================================================
   9. Mobile & Tablet Responsiveness
   ========================================================================== */
@media (max-width: 768px) {
  .previews-comparison-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .converter-guidance-grid {
    grid-template-columns: 1fr;
  }

  .image-preview-stage {
    height: 180px;
  }

  .base64-action-bar {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
}