:root {
  --bg: #0e0f12;
  --panel: #13151a;
  --text: #e8e8ef;
  --muted: #9aa0aa;
  --accent: #6ea8fe;
  --accent-2: #9bffd1;
  --border: #262b33;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --radius: 16px;
  
  /* New design tokens */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 2px 8px rgba(0,0,0,.15);
  --shadow-md: 0 8px 25px rgba(0,0,0,.25);
  --shadow-lg: 0 20px 60px rgba(0,0,0,.4);
}

html[data-theme="light"] {
  --bg: #f7f9fc;
  --panel: #ffffff;
  --text: #14171f;
  --muted: #617082;
  --accent: #1a66ff;
  --accent-2: #00b386;
  --border: #e7ecf3;
  --shadow: 0 10px 24px rgba(0,0,0,.08);
  --shadow-sm: 0 2px 8px rgba(0,0,0,.08);
  --shadow-md: 0 8px 25px rgba(0,0,0,.12);
  --shadow-lg: 0 20px 60px rgba(0,0,0,.16);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; 
  background: var(--bg); 
  color: var(--text); 
  font: 15px/1.6 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  transition: var(--transition);
}

/* Enhanced Header */
.app-header {
  display: flex; 
  align-items: center; 
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg); 
  background: var(--panel); 
  border-bottom: 1px solid var(--border);
  position: sticky; 
  top: 0; 
  z-index: 10;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}

.app-footer { 
  border-top: 1px solid var(--border); 
  border-bottom: none; 
  top: auto; 
  bottom: 0; 
  position: static; 
  margin-top: var(--spacing-md); 
  border-radius: var(--radius); 
  padding: var(--spacing-md) var(--spacing-lg);
}

.brand { 
  display: flex; 
  align-items: center; 
  gap: var(--spacing-sm); 
  transition: var(--transition);
  cursor: pointer;
}

.brand:hover {
  transform: translateY(-1px);
}

.brand .logo { 
  width: 28px; 
  height: 28px; 
  fill: var(--accent);
  transition: var(--transition);
}

.brand:hover .logo {
  fill: var(--accent-2);
  transform: scale(1.1);
}

h1 { 
  font-size: 20px; 
  margin: 0; 
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.actions { 
  display: flex; 
  gap: var(--spacing-sm); 
}

/* Enhanced Container */
.container {
  padding: var(--spacing-lg); 
  display: grid; 
  gap: var(--spacing-lg);
  grid-template-columns: 460px 1fr;
  max-width: 1400px;
  margin: 0 auto;
}

.panel {
  background: var(--panel); 
  border: 1px solid var(--border); 
  border-radius: var(--radius); 
  box-shadow: var(--shadow); 
  padding: var(--spacing-lg);
  transition: var(--transition);
}

.panel:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.panel.left { 
  min-width: 320px; 
  height: fit-content;
  position: sticky;
  top: 100px;
}

.panel.right { 
  min-height: 600px; 
  display: flex; 
  flex-direction: column; 
}

/* Enhanced Dropzone */
.dropzone {
  border: 2px dashed var(--border); 
  border-radius: var(--radius);
  padding: var(--spacing-xl); 
  display: grid; 
  place-items: center; 
  text-align: center; 
  transition: var(--transition);
  background: rgba(0,0,0,.03);
  cursor: pointer;
}

.dropzone:hover {
  border-color: var(--accent);
  background: rgba(110,168,254,.05);
  transform: translateY(-2px);
}

.dropzone:focus { 
  outline: 2px solid var(--accent); 
  outline-offset: 2px;
}

.dropzone.dragover { 
  border-color: var(--accent); 
  background: rgba(110,168,254,.1);
  transform: scale(1.02);
}

.upload-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.7;
  transition: var(--transition);
}

.dropzone:hover .upload-icon {
  opacity: 1;
  transform: scale(1.1);
}

.dz-inner h3 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.dz-inner .muted { 
  margin: var(--spacing-xs) 0; 
  color: var(--muted);
}

/* Enhanced Toolbar with Tabs */
.toolbar { 
  margin-top: var(--spacing-lg); 
  display: grid; 
  gap: var(--spacing-md); 
}

/* Tab System */
.toolbar-tabs {
  display: flex;
  gap: 2px;
  background: var(--border);
  border-radius: 10px;
  padding: 2px;
  margin-bottom: var(--spacing-md);
  box-shadow: inset 0 1px 3px rgba(0,0,0,.1);
}

.tab-btn {
  flex: 1;
  background: transparent;
  color: var(--muted);
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  font-size: 14px;
  transition: var(--transition);
  min-height: 36px;
  position: relative;
  overflow: hidden;
}

.tab-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: var(--transition);
  z-index: -1;
}

.tab-btn:hover {
  color: var(--text);
  background: rgba(110,168,254,.1);
  transform: translateY(-1px);
}

.tab-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0f14;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.tab-btn.active::before {
  opacity: 1;
}

/* Tab Content */
.tab-content {
  display: none;
  animation: fadeIn 0.2s ease-out;
  opacity: 0;
  transform: translateY(10px);
}

.tab-content.active {
  display: block !important;
  opacity: 1;
  transform: translateY(0);
}

/* Fallback: Ensure active content is always visible */
.tab-content[data-tab].active {
  display: block !important;
  visibility: visible !important;
  opacity: 1 !important;
}

/* View Mode Options */
.view-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.view-option {
  cursor: pointer;
  transition: var(--transition);
}

.view-option input[type="radio"] {
  display: none;
}

.view-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-md);
  border: 2px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
  transition: var(--transition);
  text-align: center;
  min-height: 80px;
  justify-content: center;
}

.view-option:hover .view-label {
  border-color: var(--accent);
  background: rgba(110,168,254,.05);
  transform: translateY(-2px);
}

.view-option input[type="radio"]:checked + .view-label {
  border-color: var(--accent);
  background: rgba(110,168,254,.1);
  box-shadow: 0 0 0 3px rgba(110,168,254,.2);
}

.view-icon {
  font-size: 24px;
  margin-bottom: var(--spacing-xs);
  opacity: 0.8;
  font-weight: bold;
}

.view-text {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  margin-bottom: 2px;
}

.view-desc {
  font-size: 11px;
  color: var(--muted);
  font-weight: 500;
}

/* Transform Options */
.transform-options {
  display: grid;
  gap: var(--spacing-md);
}

.transform-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.transform-label {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.transform-buttons {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Export Section */
.export-section {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--spacing-md);
  background: rgba(0,0,0,.02);
  margin-top: var(--spacing-md);
}

.export-section > label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.group { 
  border: 1px solid var(--border); 
  border-radius: 12px; 
  padding: var(--spacing-md); 
  background: rgba(0,0,0,.02);
  transition: var(--transition);
}

.group:hover {
  border-color: var(--accent);
  background: rgba(110,168,254,.03);
}

.group > label { 
  display: block; 
  font-weight: 600; 
  margin-bottom: var(--spacing-sm);
  color: var(--text);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.row { 
  display: flex; 
  flex-wrap: wrap; 
  gap: var(--spacing-sm); 
  align-items: center; 
}

/* Enhanced Inputs */
.input, select, input[type="number"], input[type="range"] {
  background: var(--bg); 
  color: var(--text); 
  border: 1px solid var(--border); 
  border-radius: 10px;
  padding: var(--spacing-sm) var(--spacing-md); 
  min-height: 40px;
  transition: var(--transition);
  font-size: 14px;
}

.input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(110,168,254,.1);
}

.input.small { 
  width: 80px; 
  min-height: 36px; 
  padding: var(--spacing-sm); 
}

/* Enhanced Aspect Ratio Options */
.aspect-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

/* Responsive adjustments for aspect ratio grid */
@media (max-width: 768px) {
  .aspect-options {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-xs);
  }
  
  .aspect-label {
    padding: var(--spacing-sm);
    min-height: 70px;
  }
  
  .aspect-icon {
    font-size: 20px;
  }
  
  .aspect-text {
    font-size: 13px;
  }
  
  .aspect-desc {
    font-size: 10px;
  }
}

@media (max-width: 480px) {
  .aspect-options {
    grid-template-columns: repeat(2, 1fr);
  }
}

.aspect-option {
  cursor: pointer;
  transition: var(--transition);
}

.aspect-option input[type="radio"] {
  display: none;
}

.aspect-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-md);
  border: 2px solid var(--border);
  border-radius: 12px;
  background: var(--bg);
  transition: var(--transition);
  text-align: center;
  min-height: 80px;
  justify-content: center;
}

.aspect-option:hover .aspect-label {
  border-color: var(--accent);
  background: rgba(110,168,254,.05);
  transform: translateY(-2px);
}

.aspect-option input[type="radio"]:checked + .aspect-label {
  border-color: var(--accent);
  background: rgba(110,168,254,.1);
  box-shadow: 0 0 0 3px rgba(110,168,254,.2);
}

.aspect-icon {
  font-size: 24px;
  margin-bottom: var(--spacing-xs);
  opacity: 0.8;
}

.aspect-text {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  margin-bottom: 2px;
}

.aspect-desc {
  font-size: 11px;
  color: var(--muted);
  font-weight: 500;
}

/* Enhanced Custom Aspect */
.custom-aspect {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: rgba(110,168,254,.05);
  border: 1px solid var(--accent);
  border-radius: 10px;
}

.custom-inputs {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.ratio-separator {
  color: var(--muted);
  font-weight: 600;
  font-size: 16px;
}

.custom-aspect.hidden { 
  display: none; 
}

/* Enhanced Buttons */
.btn {
  background: var(--panel); 
  color: var(--text); 
  border: 1px solid var(--border);
  padding: var(--spacing-sm) var(--spacing-md); 
  border-radius: 10px; 
  cursor: pointer; 
  min-height: 40px;
  transition: var(--transition);
  font-weight: 500;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.btn:hover { 
  transform: translateY(-2px); 
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.btn:active { 
  transform: translateY(0); 
}

.btn.primary { 
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); 
  color: #0b0f14; 
  font-weight: 700;
  border: none;
}

.btn.primary:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px) scale(1.02);
}

.btn.ghost { 
  background: transparent; 
}

.btn.ghost:hover {
  background: rgba(110,168,254,.1);
}



.btn.small { 
  padding: var(--spacing-xs) var(--spacing-sm); 
  min-height: 32px; 
  font-size: 12px;
}

.inline { 
  display: inline-flex; 
  align-items: center; 
  gap: var(--spacing-sm); 
  margin: 0 var(--spacing-sm); 
}

/* Enhanced Canvas */
.canvas-wrap {
  position: relative; 
  flex: 1; 
  min-height: 520px;
  background: #0a0b0e; 
  border: 1px dashed var(--border); 
  border-radius: 12px;
  display: grid; 
  place-items: center; 
  overflow: hidden;
  transition: var(--transition);
}

.canvas-wrap:hover {
  border-color: var(--accent);
}

/* Liveview background modes */
.canvas-wrap[data-bg="white"] {
  background: #ffffff;
}

.canvas-wrap[data-bg="checker"] {
  background-color: #fff;
  background-image: linear-gradient(45deg, #e6e6e6 25%, transparent 25%),
                    linear-gradient(-45deg, #e6e6e6 25%, transparent 25%),
                    linear-gradient(45deg, transparent 75%, #e6e6e6 75%),
                    linear-gradient(-45deg, transparent 75%, #e6e6e6 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

/* Background toggle control */
.canvas-bg-toggle {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 6px;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(6px);
  padding: 6px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.12);
  z-index: 5;
}

.bg-toggle-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  width: 28px;
  height: 28px;
  border-radius: 8px;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 14px;
  line-height: 1;
  padding: 0;
  transition: var(--transition);
}

.bg-toggle-btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}

.bg-toggle-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0f14;
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

#image { 
  max-width: 100%; 
  max-height: 100%; 
  display: none; 
}

.overlay {
  position: absolute; 
  inset: 0; 
  pointer-events: none; 
  display: none;
}

/* EXIF overlay and panel */
.exif-overlay {
  position: absolute;
  left: 12px;
  top: 12px;
  max-width: 70%;
  pointer-events: none;
  display: none;
  color: #fff;
  font-size: 12px;
  line-height: 1.4;
  border-radius: 8px;
  padding: 8px 10px;
  background: linear-gradient(180deg, rgba(0,0,0,0.55), rgba(0,0,0,0.6));
  backdrop-filter: blur(6px);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(255,255,255,0.12);
}

html[data-theme="light"] .exif-overlay {
  color: #0b0f14;
  background: linear-gradient(180deg, rgba(255,255,255,0.85), rgba(255,255,255,0.9));
  border-color: rgba(0,0,0,0.12);
}

.exif-panel {
  margin-top: var(--spacing-sm);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: var(--spacing-sm);
  background: rgba(0,0,0,.02);
  max-height: 240px;
  overflow: auto;
}

.exif-section {
  margin-bottom: 8px;
}
.exif-section-title {
  font-weight: 600;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin: 6px 0 4px;
}
.exif-table {
  width: 100%;
  border-collapse: collapse;
}
.exif-table th,
.exif-table td {
  border-bottom: 1px dashed var(--border);
  padding: 6px 8px;
  font-size: 12px;
}
.exif-key { color: var(--muted); width: 40%; }
.exif-val { color: var(--text); word-break: break-word; }

/* Draggable EXIF modal */
.exif-modal {
  position: fixed;
  top: 80px;
  left: 80px;
  min-width: 280px;
  max-width: 480px;
  max-height: 60vh;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  z-index: 20;
  display: none;
}
.exif-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  cursor: move;
}
.exif-modal-title { font-weight: 600; font-size: 13px; }
.exif-modal-close { cursor: pointer; border: none; background: transparent; color: var(--muted); }
.exif-modal-body { padding: 8px 10px; }

/* Enhanced Cropper.js */
.cropper-container { 
  font-size: 0; 
}

.cropper-view-box {
  outline: 2px solid rgba(255,255,255,.9);
  outline-offset: 0;
}

.cropper-line, .cropper-point { 
  background-color: rgba(255,255,255,.9); 
  opacity: .9; 
}

.cropper-face { 
  background: rgba(0, 128, 255, .08); 
}

/* Enhanced Status */
.status { 
  margin-top: var(--spacing-md); 
  padding: var(--spacing-sm);
  background: rgba(110,168,254,.1);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
  transition: var(--transition);
}

.status.success {
  background: rgba(16, 185, 129, 0.1);
  border-left-color: #10b981;
}

.status.error {
  background: rgba(239, 68, 68, 0.1);
  border-left-color: #ef4444;
}

.status.info {
  background: rgba(59, 130, 246, 0.1);
  border-left-color: #3b82f6;
}

.muted { 
  color: var(--muted); 
}

.tiny { 
  font-size: 12px; 
}

/* Enhanced Responsive */
@media (max-width: 1200px) {
  .container {
    grid-template-columns: 400px 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
  }
}

@media (max-width: 980px) {
  .container { 
    grid-template-columns: 1fr; 
    padding: var(--spacing-md);
  }
  
  .panel.left {
    position: static;
    order: 2;
  }
  
  .panel.right {
    order: 1;
    min-height: 400px;
  }
}

@media (max-width: 640px) {
  .app-header {
    padding: var(--spacing-sm) var(--spacing-md);
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .actions {
    width: 100%;
    justify-content: center;
  }
  
  .container {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }
  
  .panel {
    padding: var(--spacing-md);
  }
  
  .dropzone {
    padding: var(--spacing-lg);
  }
  
  .row {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    width: 100%;
  }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.panel {
  animation: fadeIn 0.3s ease-out;
}

/* Loading states */
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Focus indicators */
.btn:focus-visible,
.input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Responsive adjustments for tabs and view mode */
@media (max-width: 768px) {
  .toolbar-tabs {
    flex-direction: column;
    gap: 1px;
  }
  
  .tab-btn {
    min-height: 40px;
    font-size: 13px;
  }
  
  .view-options {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-xs);
  }
  
  .view-label {
    padding: var(--spacing-sm);
    min-height: 70px;
  }
  
  .view-icon {
    font-size: 20px;
  }
  
  .view-text {
    font-size: 13px;
  }
  
  .view-desc {
    font-size: 10px;
  }
  
  .transform-options {
    gap: var(--spacing-sm);
  }
  
  .transform-buttons {
    flex-direction: column;
  }
  
  .transform-buttons .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .view-options {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .aspect-options {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Tolerance Control */
.tolerance-control {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--surface-2);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.tolerance-label {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  font-size: 0.9em;
  color: var(--text-secondary);
}

.tolerance-label span:first-child {
  font-weight: 500;
  color: var(--text-primary);
}

#tolerance-value {
  font-weight: 600;
  color: var(--accent);
  font-family: monospace;
}

#tolerance-slider {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--surface-3);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  margin: var(--spacing-xs) 0;
}

#tolerance-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

#tolerance-slider::-webkit-slider-thumb:hover {
  background: var(--accent-2);
  transform: scale(1.1);
  box-shadow: var(--shadow-md);
}

#tolerance-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

#tolerance-slider::-moz-range-thumb:hover {
  background: var(--accent-2);
  transform: scale(1.1);
  box-shadow: var(--shadow-md);
}

.tolerance-info {
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.8em;
  margin-top: var(--spacing-xs);
}

.tolerance-presets {
  display: flex;
  gap: var(--spacing-xs);
  margin: var(--spacing-sm) 0;
  flex-wrap: wrap;
  justify-content: center;
}

.preset-btn {
  padding: 4px 8px;
  font-size: 0.75em;
  border: 1px solid var(--border);
  background: var(--surface-1);
  color: var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 60px;
}

.preset-btn:hover {
  background: var(--surface-2);
  border-color: var(--accent);
  color: var(--text-primary);
}

.preset-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* Responsive adjustments for tolerance control */
@media (max-width: 768px) {
  .tolerance-control {
    padding: var(--spacing-xs);
  }
  
  .tolerance-label {
    font-size: 0.85em;
  }
  
  #tolerance-slider {
    height: 8px;
  }
  
  #tolerance-slider::-webkit-slider-thumb {
    width: 20px;
    height: 20px;
  }
  
  #tolerance-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
  }
}