/* =========================================
   Design tokens
   ========================================= */
:root {
  /* Colors */
  --primary: #6366f1;
  /* Indigo 500 */
  --primary-hover: #4f46e5;
  /* Indigo 600 */
  --secondary: #64748b;
  /* Slate 500 */
  --secondary-hover: #475569;
  /* Slate 600 */
  --danger: #ef4444;
  /* Red 500 */
  --danger-hover: #dc2626;
  /* Red 600 */

  --bg-body: #f8fafc;
  /* Slate 50 */
  --bg-card: #ffffff;
  --bg-input: #f1f5f9;
  /* Slate 100 */

  --text-main: #0f172a;
  /* Slate 900 */
  --text-muted: #64748b;
  /* Slate 500 */
  --text-light: #ffffff;

  --border-color: #e2e8f0;
  /* Slate 200 */

  /* Spacing & Sizes */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  --control-height: 2.75rem;
  padding: var(--spacing-md);
}

/* Dark Mode Overrides */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-body: #0f172a;
    /* Slate 900 */
    --bg-card: #1e293b;
    /* Slate 800 */
    --bg-input: #334155;
    /* Slate 700 */

    --text-main: #f8fafc;
    /* Slate 50 */
    --text-muted: #94a3b8;
    /* Slate 400 */
    --text-light: #f8fafc;
    /* Ensure light text stays light or adapts */

    --border-color: #334155;
    /* Slate 700 */

    --primary: #818cf8;
    /* Indigo 400 - lighter for dark mode */
    --primary-hover: #6366f1;
    /* Indigo 500 */
  }

  /* Adjust specific elements if needed */
  .btn-secondary {
    background-color: var(--bg-input);
    color: var(--text-main);
    border-color: var(--border-color);
  }

  .btn-secondary:hover {
    background-color: #475569;
    /* Slate 600 */
  }
}

img,
svg {
  display: block;
  max-width: 100%;
}

body {
  background-color: var(--bg-body);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  line-height: 1.5;
}

/* =========================================
   Layout
   ========================================= */
.warning-banner {
  background-color: #fef3c7;
  border: 1px solid #fbbf24;
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.warning-banner .warning-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
}

.warning-icon {
  width: 20px;
  height: 20px;
  color: #f59e0b;
  flex-shrink: 0;
}

.warning-banner span {
  color: #92400e;
  font-size: 0.9rem;
  line-height: 1.4;
}

@media (prefers-color-scheme: dark) {
  .warning-banner {
    background-color: #78350f;
    border-color: #f59e0b;
  }

  .warning-banner span {
    color: #fbbf24;
  }
}

.container {
  max-width: 600px;
  /* Slightly wider for better canvas fit */
  margin: 0 auto;
  padding: var(--spacing-md);
}

header {
  margin-bottom: var(--spacing-xl);
  padding: 0 var(--spacing-lg);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.header-left {
  flex: 0 0 auto;
  width: 100px;
  /* Match button width to center title */
}

.header-center {
  flex: 1;
  text-align: center;
  min-width: 0;
  /* Allow shrinking */
}

.header-right {
  flex: 0 0 auto;
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  width: 100px;
  /* Match left side for centering */
  justify-content: flex-end;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.025em;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* =========================================
   Components
   ========================================= */

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  border: 1px solid var(--border-color);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--control-height);
  padding: 0 var(--spacing-lg);
  font-weight: 500;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  gap: var(--spacing-sm);
  color: var(--text-light);
  background-color: var(--primary);
}

.btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

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

.btn-secondary {
  background-color: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: #e2e8f0;
  color: var(--text-main);
}

.btn-icon {
  padding: 0;
  width: var(--control-height);
  height: var(--control-height);
  border-radius: var(--radius-md);
}

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

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

.btn-block {
  width: 100%;
}

/* Inputs */
input[type="text"],
input[type="number"],
select {
  height: var(--control-height);
  padding: 0 var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-main);
  font-size: 0.875rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  width: 100%;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
  background-color: var(--bg-card);
}

/* Label Selector (Tabs) */
.label-type-selector {
  display: flex;
  background: var(--bg-input);
  padding: 4px;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.label-type-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.label-type-btn.active {
  background: var(--bg-card);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* Canvas Area */
.canvas-container-wrapper {
  display: flex;
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-input);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow-x: auto;
  /* Allow scrolling if canvas gets too big */
  overflow-y: hidden;
}

.canvas-content {
  display: flex;
  align-items: center;
  margin: auto;
  /* Safe centering: centers when small, aligns start when overflowing */
}

.dimension-controls {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.dimension-controls.hidden {
  display: none;
}

.dimension-input-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.dimension-input-group label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
}

.dimension-input {
  width: 80px;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-card);
  color: var(--text-main);
  font-size: 14px;
  text-align: center;
}

.dimension-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(var(--primary-rgb), 0.2);
}

.dimension-unit {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

#fabricCanvas {
  box-shadow: var(--shadow-sm);
  background: white;
}

.resize-handle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 48px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: ew-resize;
  /* East-West resize cursor */
  margin-left: var(--spacing-sm);
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
  flex-shrink: 0;
  /* Prevent handle from shrinking */
  user-select: none;
  touch-action: none;
  /* Prevent browser handling of touch gestures */
}

.resize-handle:hover,
.resize-handle.active {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}

.resize-handle.hidden {
  display: none;
}

/* Control Groups */
.control-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  align-items: center;
}

.control-group.wrap {
  flex-wrap: wrap;
}

.flex-grow {
  flex-grow: 1;
}

/* Button Group (Joined Buttons) */
.button-group {
  display: flex;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.button-group .btn {
  border-radius: 0;
  border: none;
  background: var(--bg-card);
  color: var(--text-muted);
  border-right: 1px solid var(--border-color);
  flex: 1;
}

.button-group .btn:last-child {
  border-right: none;
}

.button-group .btn:hover {
  background: var(--bg-input);
  color: var(--text-main);
}

.button-group .btn.active {
  background: var(--bg-input);
  color: var(--primary);
}

/* Advanced Section */
.advanced-toggle {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.875rem;
  cursor: pointer;
  text-decoration: underline;
  margin-top: var(--spacing-md);
  display: block;
  width: 100%;
  text-align: center;
}

.advanced-toggle:hover {
  color: var(--text-main);
}

#logOutput {
  font-family: monospace;
  font-size: 0.75rem;
  background: #090e18;
  color: #22c55e;
  /* Terminal green */
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  max-height: 200px;
  overflow-y: auto;
}

/* Responsive */
@media (max-width: 480px) {
  .container {
    padding: var(--spacing-xs);
  }

  header {
    margin-bottom: var(--spacing-md);
  }

  .card {
    padding: var(--spacing-md);
  }

  .label-type-selector {
    margin-bottom: var(--spacing-md);
  }

  .control-group {
    flex-wrap: wrap;
  }

  .btn-icon {
    flex: 1;
    /* Make icon buttons expand on mobile for easier touch */
  }

  .button-group {
    width: 100%;
  }
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  gap: var(--spacing-sm);
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: relative;
  display: inline-block;
  width: 3rem;
  height: 1.5rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  /* Pill shape */
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 1rem;
  width: 1rem;
  left: 0.25rem;
  bottom: 0.2rem;
  background-color: var(--text-muted);
  border-radius: 50%;
  transition: .4s;
}

input:checked+.slider {
  background-color: var(--primary);
  border-color: var(--primary);
}

input:focus+.slider {
  box-shadow: 0 0 1px var(--primary);
}

input:checked+.slider:before {
  transform: translateX(1.5rem);
  background-color: white;
}

/* Icons */
.icon {
  width: 1.25em;
  height: 1.25em;
  fill: currentColor;
  display: inline-block;
  vertical-align: middle;
}

.btn .icon {
  margin-right: 0;
  /* Handled by gap in .btn */
}

/* Utilities */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mt-4 {
  margin-top: 1rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

/* Modal Styles */
.modal {
  display: none;
  /* Hidden by default */
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
  /* Black w/ opacity */
  backdrop-filter: blur(5px);
  align-items: center;
  justify-content: center;
}

.modal-content {
  background-color: var(--bg-card);
  margin: auto;
  padding: var(--spacing-xl);
  border: 1px solid var(--border-color);
  width: 90%;
  max-width: 500px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: none;
  border: none;
  font-size: 2rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.modal-close:hover {
  background-color: var(--bg-input);
  color: var(--text-main);
}

.header-btn {
  z-index: 10;
}

.shortcuts-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.shortcut-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

.shortcut-item:last-child {
  border-bottom: none;
}

.shortcut-description {
  color: var(--text-main);
  flex: 1;
}

.shortcut-keys {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.shortcut-key {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-main);
  font-family: monospace;
}

.modal h2 {
  margin-top: 0;
  color: var(--text-main);
  margin-bottom: var(--spacing-sm);
}

.modal p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--text-main);
  font-weight: 500;
}

/* Show modal when active */
.modal.show {
  display: block;
}

/* Fixes for Modal Alignment */
.form-group .toggle-switch {
  display: inline-flex;
  align-items: center;
}

#paperWidth,
#paperHeight {
  width: 120px;
}

#copyCount,
#labelSpacing {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-card);
  color: var(--text-main);
  font-size: 14px;
}

/* =========================================
   Modern QR UI Styles
   ========================================= */

.form-group-modern {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.input-label {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-main);
}

.qr-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-5px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.input-modern {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  color: var(--text-main);
  font-size: 0.875rem;
  transition: all 0.2s ease;
  line-height: 1.5;
}

.input-modern:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-modern::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-sm);
}

.helper-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0;
}

.checkbox-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  user-select: none;
}

.checkbox-text {
  font-size: 0.875rem;
  color: var(--text-main);
}

.date-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.date-group label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* Specific Tweak for Textarea */
textarea.input-modern {
  resize: vertical;
  min-height: 2.5rem;
}