/* ============================================
   Screenshot Beautifier - Modern Dark Theme
   ============================================ */

/* CSS Variables */
:root {
  /* Customizable Screenshot Properties */
  --screenshot-padding: 64px;
  --screenshot-radius: 12px;
  --shadow-blur: 40px;
  --shadow-opacity: 0.3;
  --gradient-angle: 135deg;

  /* Theme Colors */
  --sidebar-bg: #1a1a2e;
  --sidebar-border: #2d2d44;
  --preview-bg: #0f0f1a;
  --preview-surface: #16162a;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --accent-hover: #7b8ff0;
  --input-bg: #252540;
  --input-border: #3d3d5c;
  --input-focus: #667eea;
  --danger: #ff4757;
  --warning: #ffa502;
  --success: #2ed573;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--preview-bg);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ============================================
   App Container Layout
   ============================================ */

.app {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* ============================================
   Sidebar Styles
   ============================================ */

.sidebar {
  width: 320px;
  min-width: 320px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  height: 100vh;
  position: sticky;
  top: 0;
}

.sidebar::-webkit-scrollbar {
  width: 6px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background-color: var(--input-border);
  border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
  background-color: var(--text-muted);
}

/* Sidebar Header */
.sidebar-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--sidebar-border);
}

.sidebar-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.sidebar-header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ============================================
   Control Sections
   ============================================ */

.control-section {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--sidebar-border);
}

.control-section:last-child {
  border-bottom: none;
}

.control-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

.control-section label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   Gradient Preset Buttons
   ============================================ */

.gradient-presets {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--spacing-sm);
}

.gradient-btn,
.gradient-preset,
[data-gradient] {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast),
    border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.gradient-preset:hover,
[data-gradient]:hover {
  transform: scale(1.08);
  border-color: rgba(255, 255, 255, 0.3);
}

.gradient-preset.active,
[data-gradient].active {
  border-color: var(--text-primary);
  box-shadow: 0 0 0 2px var(--accent-primary);
}

.gradient-preset:active,
[data-gradient]:active {
  transform: scale(0.95);
}

/* Gradient Backgrounds - Match JS presets */
[data-gradient='sunset'] {
  background: linear-gradient(135deg, #ff6b6b 0%, #feca57 100%);
}

[data-gradient='ocean'] {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

[data-gradient='tropical'] {
  background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

[data-gradient='aurora'] {
  background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

[data-gradient='fire'] {
  background: linear-gradient(135deg, #f12711 0%, #f5af19 100%);
}

[data-gradient='forest'] {
  background: linear-gradient(135deg, #134e5e 0%, #71b280 100%);
}

[data-gradient='midnight'] {
  background: linear-gradient(135deg, #232526 0%, #414345 100%);
}

[data-gradient='coral'] {
  background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
}

[data-gradient='lavender'] {
  background: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%);
}

[data-gradient='custom'] {
  background: var(--input-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-gradient='custom']::before {
  content: '+';
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

[data-gradient='custom']:hover::before {
  color: var(--text-primary);
}

/* ============================================
   Saved Presets
   ============================================ */

.saved-presets {
  margin-top: var(--spacing-md);
}

.saved-presets > label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.saved-presets-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.saved-preset-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.saved-preset-name {
  font-size: 0.625rem;
  color: var(--text-muted);
  text-align: center;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.saved-preset-item {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast),
    border-color var(--transition-fast), box-shadow var(--transition-fast);
  overflow: hidden;
}

.saved-preset-item:hover {
  transform: scale(1.05);
  border-color: rgba(255, 255, 255, 0.3);
}

.saved-preset-item.active {
  border-color: var(--text-primary);
  box-shadow: 0 0 0 2px var(--accent-primary);
}

.saved-preset-item.favorite::after {
  content: '\2605';
  position: absolute;
  top: 2px;
  right: 2px;
  font-size: 10px;
  color: #ffd700;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.saved-preset-actions {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 2px;
  padding: 2px;
  background: rgba(0, 0, 0, 0.7);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.saved-preset-item:hover .saved-preset-actions {
  opacity: 1;
}

.saved-preset-actions button {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 2px 4px;
  font-size: 10px;
  transition: color var(--transition-fast);
}

.saved-preset-actions button:hover {
  color: var(--text-primary);
}

.saved-preset-actions button.favorite-btn:hover {
  color: #ffd700;
}

.saved-preset-actions button.edit-btn:hover {
  color: var(--accent-primary);
}

.saved-preset-actions button.delete-btn:hover {
  color: var(--danger);
}

/* Preset Preview in Modal */
.preset-preview {
  width: 100%;
  height: 60px;
  border-radius: var(--radius-md);
  border: 1px solid var(--input-border);
}

/* ============================================
   Range Sliders
   ============================================ */

.slider-container {
  margin-bottom: var(--spacing-md);
}

.slider-container:last-child {
  margin-bottom: 0;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.slider-header label {
  margin-bottom: 0;
}

.slider-value {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent-primary);
  background-color: var(--input-bg);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  min-width: 48px;
  text-align: center;
}

input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--input-bg);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

input[type='range']::-webkit-slider-track {
  height: 6px;
  background: linear-gradient(
    to right,
    var(--accent-primary) 0%,
    var(--accent-primary) var(--value, 50%),
    var(--input-bg) var(--value, 50%),
    var(--input-bg) 100%
  );
  border-radius: 3px;
}

input[type='range']::-moz-range-track {
  height: 6px;
  background: var(--input-bg);
  border-radius: 3px;
}

input[type='range']::-moz-range-progress {
  height: 6px;
  background: var(--accent-primary);
  border-radius: 3px;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

input[type='range']::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border: none;
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

input[type='range']::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.4);
}

input[type='range']::-moz-range-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.4);
}

input[type='range']::-webkit-slider-thumb:active {
  cursor: grabbing;
  transform: scale(1.1);
}

input[type='range']::-moz-range-thumb:active {
  cursor: grabbing;
  transform: scale(1.1);
}

input[type='range']:focus {
  outline: none;
}

input[type='range']:focus::-webkit-slider-thumb {
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3), 0 2px 6px rgba(0, 0, 0, 0.3);
}

input[type='range']:focus::-moz-range-thumb {
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3), 0 2px 6px rgba(0, 0, 0, 0.3);
}

/* ============================================
   Radio Buttons
   ============================================ */

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

.radio-group.horizontal {
  flex-direction: row;
  flex-wrap: wrap;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.radio-option:hover {
  background-color: var(--input-bg);
}

.radio-option input[type='radio'] {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--input-border);
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  transition: border-color var(--transition-fast);
}

.radio-option input[type='radio']::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 8px;
  height: 8px;
  background-color: var(--accent-primary);
  border-radius: 50%;
  transition: transform var(--transition-fast);
}

.radio-option input[type='radio']:checked {
  border-color: var(--accent-primary);
}

.radio-option input[type='radio']:checked::before {
  transform: translate(-50%, -50%) scale(1);
}

.radio-option input[type='radio']:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

.radio-option span {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.radio-option:hover span {
  color: var(--text-primary);
}

.radio-option input[type='radio']:checked + span {
  color: var(--text-primary);
}

/* ============================================
   Checkbox Styles
   ============================================ */

.checkbox-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  padding: var(--spacing-sm) 0;
}

.checkbox-option input[type='checkbox'] {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid var(--input-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  position: relative;
  transition: border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.checkbox-option input[type='checkbox']::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 10px;
  height: 6px;
  border-left: 2px solid var(--text-primary);
  border-bottom: 2px solid var(--text-primary);
  transform-origin: center;
  opacity: 0;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.checkbox-option input[type='checkbox']:checked {
  border-color: var(--accent-primary);
  background-color: var(--accent-primary);
}

.checkbox-option input[type='checkbox']:checked::before {
  transform: translate(-50%, -60%) rotate(-45deg) scale(1);
  opacity: 1;
}

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

/* ============================================
   Preview Area
   ============================================ */

.preview-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  background-color: var(--preview-bg);
  min-height: 100vh;
  position: relative;
  overflow: auto;
}

/* ============================================
   Preview Container & Wrapper
   ============================================ */

.preview-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  width: 100%;
  max-width: 1200px;
}

.preview-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 200px;
  min-height: 200px;
  background: linear-gradient(135deg, #ff6b6b 0%, #feca57 100%);
  padding: 60px;
  transition: padding var(--transition-normal), background var(--transition-normal);
}

/* ============================================
   Screenshot Frame
   ============================================ */

.screenshot-frame {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  transition: border-radius var(--transition-normal), box-shadow var(--transition-normal);
}

.screenshot-frame img {
  display: block;
  max-width: 100%;
  height: auto;
}

.screenshot-frame.has-titlebar img {
  border-radius: 0;
}

.screenshot-frame.has-titlebar .screenshot-container {
  border-radius: 0;
}

/* ============================================
   Window Titlebars
   ============================================ */

.window-titlebar {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  background-color: #2d2d2d;
  border-radius: calc(var(--screenshot-radius) - 4px)
    calc(var(--screenshot-radius) - 4px) 0 0;
}

/* macOS Titlebar */
.window-titlebar.macos {
  gap: 8px;
  background: linear-gradient(to bottom, #3d3d3d, #2d2d2d);
}

.window-titlebar.macos .titlebar-buttons {
  display: flex;
  gap: 8px;
}

.window-titlebar.macos .titlebar-button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: none;
  cursor: default;
  position: relative;
  transition: filter var(--transition-fast);
}

.window-titlebar.macos .titlebar-button.close {
  background-color: #ff5f57;
}

.window-titlebar.macos .titlebar-button.minimize {
  background-color: #ffbd2e;
}

.window-titlebar.macos .titlebar-button.maximize {
  background-color: #28ca42;
}

.window-titlebar.macos:hover .titlebar-button.close::before {
  content: '\00d7';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 10px;
  font-weight: bold;
  color: rgba(0, 0, 0, 0.5);
}

.window-titlebar.macos:hover .titlebar-button.minimize::before {
  content: '\2212';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 10px;
  font-weight: bold;
  color: rgba(0, 0, 0, 0.5);
}

.window-titlebar.macos:hover .titlebar-button.maximize::before {
  content: '\002B';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 10px;
  font-weight: bold;
  color: rgba(0, 0, 0, 0.5);
}

.window-titlebar.macos .titlebar-title {
  flex: 1;
  text-align: center;
  font-size: 13px;
  color: #999;
  font-weight: 500;
}

.window-titlebar.macos .titlebar-spacer {
  width: 52px; /* Matches buttons: 3 x 12px + 2 x 8px gap */
}

/* Windows Titlebar */
.window-titlebar.windows {
  justify-content: space-between;
  background: linear-gradient(to bottom, #2d2d2d, #252525);
  padding: 8px 12px;
}

.window-titlebar.windows .titlebar-title {
  font-size: 12px;
  color: #ccc;
  padding-left: 4px;
}

.window-titlebar.windows .titlebar-buttons {
  display: flex;
  gap: 0;
}

.window-titlebar.windows .titlebar-button {
  width: 46px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: default;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-size: 10px;
  transition: background-color var(--transition-fast);
}

.window-titlebar.windows .titlebar-button:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.window-titlebar.windows .titlebar-button.close:hover {
  background-color: #e81123;
  color: white;
}

.window-titlebar.windows .titlebar-button .icon {
  width: 10px;
  height: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.window-titlebar.windows .titlebar-button.minimize .icon::before {
  content: '';
  width: 10px;
  height: 1px;
  background-color: currentColor;
}

.window-titlebar.windows .titlebar-button.maximize .icon::before {
  content: '';
  width: 9px;
  height: 9px;
  border: 1px solid currentColor;
}

.window-titlebar.windows .titlebar-button.close .icon::before {
  content: '\00d7';
  font-size: 16px;
  line-height: 1;
}

/* ============================================
   Upload Zone
   ============================================ */

.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 300px;
  border: 2px dashed var(--input-border);
  border-radius: var(--radius-xl);
  background-color: var(--input-bg);
  cursor: pointer;
  transition: border-color var(--transition-normal),
    background-color var(--transition-normal), transform var(--transition-normal);
}

.upload-zone:hover {
  border-color: var(--accent-primary);
  background-color: rgba(102, 126, 234, 0.05);
}

.upload-zone.drag-over {
  border-color: var(--accent-primary);
  background-color: rgba(102, 126, 234, 0.1);
  transform: scale(1.02);
  border-style: solid;
}

.upload-zone .upload-icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
  color: var(--text-muted);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.upload-zone:hover .upload-icon {
  color: var(--accent-primary);
  transform: translateY(-4px);
}

.upload-zone .upload-text {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

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

.upload-zone input[type='file'] {
  display: none;
}

/* ============================================
   Empty State
   ============================================ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-muted);
}

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

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  font-size: 0.875rem;
  max-width: 300px;
}

/* ============================================
   Screenshot Container
   ============================================ */

.screenshot-container {
  position: relative;
  overflow: hidden;
  border-radius: inherit;
}

.screenshot-container img {
  display: block;
  max-width: 100%;
  height: auto;
}

.screenshot-container canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;
}

/* ============================================
   Annotation Tools
   ============================================ */

.annotation-tools {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background-color: var(--sidebar-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--sidebar-border);
}

.annotation-tools .divider {
  width: 1px;
  height: 24px;
  background-color: var(--sidebar-border);
  margin: 0 var(--spacing-xs);
}

.tool-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast),
    color var(--transition-fast), transform var(--transition-fast);
}

.tool-btn:hover {
  background-color: var(--input-bg);
  color: var(--text-primary);
}

.tool-btn:active {
  transform: scale(0.92);
}

.tool-btn.active {
  background-color: var(--accent-primary);
  color: var(--text-primary);
}

.tool-btn.active:hover {
  background-color: var(--accent-hover);
}

.tool-btn svg,
.tool-btn .icon {
  width: 20px;
  height: 20px;
}

/* Color picker in annotation tools */
.tool-btn input[type='color'] {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border: 2px solid var(--input-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
  background: transparent;
}

.tool-btn input[type='color']::-webkit-color-swatch-wrapper {
  padding: 0;
}

.tool-btn input[type='color']::-webkit-color-swatch {
  border: none;
  border-radius: 2px;
}

/* ============================================
   Button Styles
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 12px 24px;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast),
    transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:active {
  transform: scale(0.96);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Primary Button */
.btn-primary {
  background: linear-gradient(
    135deg,
    var(--accent-primary),
    var(--accent-secondary)
  );
  color: var(--text-primary);
  box-shadow: 0 4px 14px rgba(102, 126, 234, 0.35);
}

.btn-primary:hover:not(:disabled) {
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.45);
  transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0) scale(0.98);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--sidebar-border);
  color: var(--text-primary);
}

/* Ghost Button */
.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--input-bg);
  color: var(--text-primary);
}

/* Danger Button */
.btn-danger {
  background-color: var(--danger);
  color: var(--text-primary);
}

.btn-danger:hover:not(:disabled) {
  background-color: #ff6b7a;
}

/* Icon Button */
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
}

/* Small Button */
.btn-sm {
  padding: 8px 16px;
  font-size: 0.8125rem;
}

/* Large Button */
.btn-lg {
  padding: 16px 32px;
  font-size: 1rem;
}

/* Button Group */
.btn-group {
  display: flex;
  gap: var(--spacing-sm);
}

.btn-group.vertical {
  flex-direction: column;
}

/* ============================================
   Modal Styles
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--sidebar-bg);
  border-radius: var(--radius-xl);
  border: 1px solid var(--sidebar-border);
  padding: var(--spacing-xl);
  width: 90%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
}

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

.modal-body {
  margin-bottom: var(--spacing-lg);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
}

/* Text Input for Modal */
.text-input,
.modal input[type='text'],
.modal textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 0.875rem;
  color: var(--text-primary);
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.text-input:focus,
.modal input[type='text']:focus,
.modal textarea:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.text-input::placeholder,
.modal input::placeholder,
.modal textarea::placeholder {
  color: var(--text-muted);
}

.modal textarea {
  min-height: 100px;
  resize: vertical;
  font-family: inherit;
}

/* ============================================
   Toast Notifications
   ============================================ */

.toast-container {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: 1100;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--sidebar-bg);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  pointer-events: auto;
  transform: translateX(120%);
  opacity: 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast.hiding {
  transform: translateX(120%);
  opacity: 0;
}

.toast-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.toast.success .toast-icon {
  background-color: rgba(46, 213, 115, 0.2);
  color: var(--success);
}

.toast.error .toast-icon {
  background-color: rgba(255, 71, 87, 0.2);
  color: var(--danger);
}

.toast.warning .toast-icon {
  background-color: rgba(255, 165, 2, 0.2);
  color: var(--warning);
}

.toast.info .toast-icon {
  background-color: rgba(102, 126, 234, 0.2);
  color: var(--accent-primary);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.toast-message {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.toast-close {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
}

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

/* ============================================
   Select Dropdown
   ============================================ */

.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: '';
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid var(--text-muted);
  pointer-events: none;
}

select {
  width: 100%;
  padding: 12px 40px 12px 16px;
  font-size: 0.875rem;
  color: var(--text-primary);
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  outline: none;
  cursor: pointer;
  appearance: none;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

select:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

select option {
  background-color: var(--sidebar-bg);
  color: var(--text-primary);
}

/* ============================================
   Color Input
   ============================================ */

.color-input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

input[type='color'] {
  -webkit-appearance: none;
  appearance: none;
  width: 40px;
  height: 40px;
  border: 2px solid var(--input-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 0;
  background: transparent;
  transition: border-color var(--transition-fast);
}

input[type='color']:hover {
  border-color: var(--text-muted);
}

input[type='color']:focus {
  outline: none;
  border-color: var(--input-focus);
}

input[type='color']::-webkit-color-swatch-wrapper {
  padding: 2px;
}

input[type='color']::-webkit-color-swatch {
  border: none;
  border-radius: 4px;
}

input[type='color']::-moz-color-swatch {
  border: none;
  border-radius: 4px;
}

/* ============================================
   Loading Spinner
   ============================================ */

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--input-border);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

/* ============================================
   Tooltip
   ============================================ */

[data-tooltip] {
  position: relative;
}

[data-tooltip]::before,
[data-tooltip]::after {
  position: absolute;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  pointer-events: none;
}

[data-tooltip]::before {
  content: attr(data-tooltip);
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 12px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--sidebar-bg);
  border: 1px solid var(--sidebar-border);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

[data-tooltip]::after {
  content: '';
  bottom: calc(100% + 2px);
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--sidebar-border);
}

[data-tooltip]:hover::before,
[data-tooltip]:hover::after {
  opacity: 1;
  visibility: visible;
}

/* ============================================
   Export Actions
   ============================================ */

.export-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

/* ============================================
   Responsive Layout
   ============================================ */

@media (max-width: 1200px) {
  .sidebar {
    width: 280px;
    min-width: 280px;
  }

  .gradient-presets {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (max-width: 992px) {
  .app {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    min-width: 100%;
    height: auto;
    max-height: 50vh;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--sidebar-border);
  }

  .preview-area {
    min-height: 50vh;
  }

  .gradient-presets {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --screenshot-padding: 32px;
  }

  .sidebar {
    max-height: 60vh;
  }

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

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

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

  .gradient-presets {
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-xs);
  }

  .annotation-tools {
    flex-wrap: wrap;
    justify-content: center;
  }

  .toast-container {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    left: var(--spacing-md);
  }

  .toast {
    width: 100%;
  }

  .modal {
    width: 95%;
    padding: var(--spacing-lg);
  }

  .export-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  :root {
    --screenshot-padding: 24px;
  }

  .sidebar-header h1 {
    font-size: 1.125rem;
  }

  .gradient-presets {
    grid-template-columns: repeat(4, 1fr);
  }

  .tool-btn {
    width: 36px;
    height: 36px;
  }

  .window-titlebar.macos .titlebar-button {
    width: 10px;
    height: 10px;
  }

  .window-titlebar.macos {
    padding: 10px 12px;
  }
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
  display: none !important;
}

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

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

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

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.flex {
  display: flex;
}

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

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
  .sidebar,
  .annotation-tools,
  .export-actions,
  .toast-container {
    display: none !important;
  }

  .app {
    display: block;
  }

  .preview-area {
    padding: 0;
    background: white;
  }
}