/* CSS Variables for Design System */
:root {
  /* Colors - HSL Format */
  --primary-hue: 222;
  --primary-sat: 47%;
  --primary-light: 11%;
  
  --secondary-hue: 210;
  --secondary-sat: 40%;
  --secondary-light: 96%;
  
  --accent-hue: 204;
  --accent-sat: 100%;
  --accent-light: 50%;
  
  --success-hue: 142;
  --success-sat: 76%;
  --success-light: 36%;
  
  --warning-hue: 38;
  --warning-sat: 92%;
  --warning-light: 50%;
  
  --error-hue: 0;
  --error-sat: 84%;
  --error-light: 60%;
  
  /* Light Theme */
  --bg-primary: hsl(0, 0%, 100%);
  --bg-secondary: hsl(210, 40%, 98%);
  --bg-tertiary: hsl(210, 40%, 96%);
  --bg-glass: hsla(0, 0%, 100%, 0.8);
  --bg-overlay: hsla(0, 0%, 0%, 0.5);
  
  --text-primary: hsl(222, 84%, 5%);
  --text-secondary: hsl(215, 16%, 47%);
  --text-tertiary: hsl(215, 16%, 65%);
  
  --border-primary: hsl(214, 32%, 91%);
  --border-secondary: hsl(214, 32%, 85%);
  
  --shadow-sm: 0 1px 2px 0 hsla(0, 0%, 0%, 0.05);
  --shadow-md: 0 4px 6px -1px hsla(0, 0%, 0%, 0.1), 0 2px 4px -1px hsla(0, 0%, 0%, 0.06);
  --shadow-lg: 0 10px 15px -3px hsla(0, 0%, 0%, 0.1), 0 4px 6px -2px hsla(0, 0%, 0%, 0.05);
  --shadow-xl: 0 20px 25px -5px hsla(0, 0%, 0%, 0.1), 0 10px 10px -5px hsla(0, 0%, 0%, 0.04);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, hsl(var(--primary-hue), var(--primary-sat), var(--primary-light)), hsl(var(--accent-hue), var(--accent-sat), var(--accent-light)));
  --gradient-bg: linear-gradient(135deg, hsl(210, 60%, 98%), hsl(280, 60%, 98%), hsl(160, 60%, 98%));
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Typography */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  
  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-normal: 250ms ease-out;
  --transition-slow: 350ms ease-out;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: #0D1117;
  --bg-secondary: #131A25;
  --bg-tertiary: #1B2735;
  --bg-glass: rgba(13, 17, 23, 0.8);
  --bg-overlay: rgba(0, 0, 0, 0.7);
  
  --text-primary: #FFFFFF;
  --text-secondary: #C0C0C0;
  --text-tertiary: #A0A0A0;
  
  --border-primary: #E2E8F0;
  --border-secondary: #CBD5E1;
  
  --gradient-bg: linear-gradient(135deg, #0D1117, #131A25, #1B2735);
  
  /* New color scheme variables */
  --color-bg-main: #0D1117;
  --color-bg-panel: #131A25;
  --color-card: #1B2735;
  --color-highlight: #009EFF;
  --color-logo: #FACC15;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #C0C0C0;
  --color-border: #E2E8F0;
  --color-link: #3B82F6;
  --color-effect-green: #00FF94;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: var(--gradient-bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition-normal), color var(--transition-normal);
}

html, body {
  overflow-x: hidden;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(20px);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-primary);
  transition: all var(--transition-normal);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  flex-wrap: nowrap;
  min-height: 60px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  min-width: 0;
  /* Ensure logo is visible */
  position: relative;
  z-index: 10;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xl);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-lg);
}

.logo-img {
  width: 48px;
  height: 48px;
  max-width: 60px;
  max-height: 60px;
  border-radius: var(--radius-lg);
  object-fit: contain;
  background: transparent;
  box-shadow: none;
  margin-right: var(--space-2);
  display: block;
  transition: transform 0.18s;
  /* Visually zoom in the logo image */
  transform: scale(1.1);
}
.logo-img-light {
  display: block;
}
.logo-img-dark {
  display: none;
}
[data-theme="dark"] .logo-img-light {
  display: none;
}
[data-theme="dark"] .logo-img-dark {
  display: block;
}

.logo-text h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0;
  line-height: 1.2;
}

.logo-text p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(79, 195, 247, 0.3);
}

.btn-primary {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px rgba(79, 195, 247, 0.3);
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 195, 247, 0.4);
  background: linear-gradient(135deg, #29B6F6, #0288D1);
}

/* Dark theme specific button styling */
[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
}

[data-theme="dark"] .btn-primary:hover {
  background: linear-gradient(135deg, #29B6F6, #0288D1);
  box-shadow: 0 4px 12px rgba(79, 195, 247, 0.4);
}

.btn-secondary {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
  border: none;
  box-shadow: 0 2px 8px rgba(79, 195, 247, 0.3);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: linear-gradient(135deg, #29B6F6, #0288D1);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 195, 247, 0.4);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  justify-content: center;
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  box-shadow: 0 2px 8px rgba(79, 195, 247, 0.3);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}



/* Custom SVG theme icons styling */
.theme-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 0.6s ease-in-out;
}

.theme-icon.active {
  opacity: 1;
}

.theme-icon svg {
  width: 20px;
  height: 20px;
  stroke: #FFD700;
  stroke-width: 1.5;
  fill: none;
  filter: drop-shadow(0 0 8px rgba(255, 215, 0, 0.6));
  transition: all 0.6s ease-in-out;
}

/* Remove focus outline from theme toggle button */
.btn-icon:focus-visible {
  outline: none;
}

/* Remove focus outline from theme toggle button in dark mode */
[data-theme="dark"] .btn-icon:focus-visible {
  outline: none;
}



/* Dark theme specific SVG icon styling */
[data-theme="dark"] .theme-icon svg {
  stroke: #FFD700;
  fill: none;
  filter: drop-shadow(0 0 10px rgba(255, 215, 0, 0.7));
}

/* Main Content */
.main {
  padding: var(--space-8) 0;
}

/* Cards */
.card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  transition: all var(--transition-normal);
}

.input-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  transition: all var(--transition-normal);
  padding: var(--space-6);
  margin-bottom: var(--space-8);
}

.loading-card {
  padding: var(--space-8);
  text-align: center;
  margin-bottom: var(--space-8);
}

.preview-card {
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.palette-card {
  padding: var(--space-6);
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
  background: var(--bg-secondary);
  padding: var(--space-1);
  border-radius: var(--radius-lg);
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: transparent;
  color: var(--text-secondary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.tab-btn.active {
  background: var(--bg-primary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.tab-btn:hover:not(.active) {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.tab-content {
  position: relative;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Upload Area */
.upload-area {
  border: 2px dashed var(--border-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  background: var(--bg-secondary);
}

.upload-area:hover {
  border-color: hsl(var(--accent-hue), var(--accent-sat), var(--accent-light));
  background: var(--bg-tertiary);
}

.upload-area.dragover {
  border-color: hsl(var(--accent-hue), var(--accent-sat), var(--accent-light));
  background: hsla(var(--accent-hue), var(--accent-sat), var(--accent-light), 0.1);
}

/* Dark theme specific upload area styling */
[data-theme="dark"] .upload-area:hover {
  border-color: var(--color-highlight);
  background: var(--color-card);
}

[data-theme="dark"] .upload-area.dragover {
  border-color: var(--color-highlight);
  background: rgba(0, 158, 255, 0.1);
}

.upload-content i {
  font-size: var(--font-size-3xl);
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.upload-content h3 {
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.upload-content p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* URL Input */
.url-input-group {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.url-input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

.url-input:focus {
  outline: none;
  border-color: hsl(var(--accent-hue), var(--accent-sat), var(--accent-light));
  box-shadow: 0 0 0 3px hsla(var(--accent-hue), var(--accent-sat), var(--accent-light), 0.1);
}

/* Dark theme specific URL input focus */
[data-theme="dark"] .url-input:focus {
  border-color: var(--color-highlight);
  box-shadow: 0 0 0 3px rgba(0, 158, 255, 0.1);
}

.url-info {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3);
  background: hsla(var(--accent-hue), var(--accent-sat), var(--accent-light), 0.1);
  border: 1px solid hsla(var(--accent-hue), var(--accent-sat), var(--accent-light), 0.2);
  border-radius: var(--radius-md);
}

.url-info i {
  color: hsl(var(--accent-hue), var(--accent-sat), var(--accent-light));
  margin-top: 2px;
}

/* Dark theme specific URL info */
[data-theme="dark"] .url-info {
  background: rgba(0, 158, 255, 0.1);
  border: 1px solid rgba(0, 158, 255, 0.2);
}

[data-theme="dark"] .url-info i {
  color: var(--color-highlight);
}

.url-info p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

/* Loading */
.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-primary);
  border-top: 4px solid hsl(var(--accent-hue), var(--accent-sat), var(--accent-light));
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-4);
}

/* Dark theme specific loading spinner */
[data-theme="dark"] .loading-spinner {
  border-top: 4px solid var(--color-highlight);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Image Preview */
.image-preview {
  display: flex;
  justify-content: center;
}

.image-preview img {
  max-width: 100%;
  max-height: 300px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Color Categories */
.color-categories {
  display: grid;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.color-category h4 {
  font-size: var(--font-size-base);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

.color-swatches {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* Color Swatches */
.color-swatch {
  position: relative;
  cursor: pointer;
  border-radius: var(--radius-lg);
  border: 2px solid hsla(0, 0%, 100%, 0.2);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.color-swatch.large {
  width: 64px;
  height: 64px;
}

.color-swatch.medium {
  width: 48px;
  height: 48px;
}

.color-swatch.small {
  width: 32px;
  height: 32px;
}

.color-swatch:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
  z-index: 10;
}

.color-swatch.copied::after {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-weight: bold;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  font-size: var(--font-size-lg);
}

/* Color Tooltip */
.color-tooltip {
  position: absolute;
  z-index: 1000;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.tooltip-content {
  background: hsla(0, 0%, 0%, 0.9);
  color: white;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  min-width: 150px;
  backdrop-filter: blur(10px);
}

.color-value {
  font-family: 'Courier New', monospace;
  margin-bottom: var(--space-1);
}

.color-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid hsla(255, 255, 255, 0.2);
}

.wcag-badge {
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.wcag-badge.aaa {
  background: hsl(var(--success-hue), var(--success-sat), var(--success-light));
  color: white;
}

.wcag-badge.aa {
  background: hsl(var(--warning-hue), var(--warning-sat), var(--warning-light));
  color: white;
}

.wcag-badge.fail {
  background: hsl(var(--error-hue), var(--error-sat), var(--error-light));
  color: white;
}

.frequency {
  font-size: var(--font-size-xs);
  color: hsla(255, 255, 255, 0.7);
}

/* Usage Tips */
.usage-tips {
  padding: var(--space-4);
  background: hsla(var(--accent-hue), var(--accent-sat), var(--accent-light), 0.1);
  border: 1px solid hsla(var(--accent-hue), var(--accent-sat), var(--accent-light), 0.2);
  border-radius: var(--radius-lg);
}

.usage-tips h5 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: hsl(var(--accent-hue), var(--accent-sat), var(--accent-light));
  margin-bottom: var(--space-3);
  font-weight: 600;
}

/* Dark theme specific usage tips */
[data-theme="dark"] .usage-tips {
  background: rgba(0, 158, 255, 0.1);
  border: 1px solid rgba(0, 158, 255, 0.2);
}

[data-theme="dark"] .usage-tips h5 {
  color: var(--color-highlight);
}

.usage-tips ul {
  list-style: none;
  color: var(--text-secondary);
}

.usage-tips li {
  position: relative;
  padding-left: var(--space-4);
  margin-bottom: var(--space-1);
  font-size: var(--font-size-sm);
}

.usage-tips li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: hsl(var(--accent-hue), var(--accent-sat), var(--accent-light));
  font-weight: bold;
}

/* Dark theme specific usage tips bullets */
[data-theme="dark"] .usage-tips li::before {
  color: var(--color-highlight);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toast {
  padding: var(--space-3) var(--space-4);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  color: var(--text-primary);
  max-width: 300px;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

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

.toast.success {
  border-left: 4px solid hsl(var(--success-hue), var(--success-sat), var(--success-light));
}

.toast.error {
  border-left: 4px solid hsl(var(--error-hue), var(--error-sat), var(--error-light));
}

.toast.warning {
  border-left: 4px solid hsl(var(--warning-hue), var(--warning-sat), var(--warning-light));
}

/* --- ENTERPRISE PALETTE POLISH --- */
.palette-card {
  padding: 2.2rem 2rem 2.5rem 2rem;
  background: var(--bg-glass);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 24px rgba(31,38,135,0.10);
  margin-bottom: 2.5rem;
  position: relative;
  overflow: visible;
}
.palette-toolbar {
  margin-bottom: 1.2rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 8px rgba(31,38,135,0.04);
  padding: 0.7rem 1.2rem;
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.palette-divider {
  border: none;
  border-top: 1.5px solid var(--border-primary);
  margin: 0.7rem 0 1.2rem 0;
  width: 100%;
  opacity: 0.7;
}
.palette-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1.2rem;
  margin-top: 0;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  text-align: left;
}
.color-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.2rem 2rem;
  margin-bottom: 2.2rem;
}
.palette-code-block {
  margin-top: 1.2rem;
  margin-bottom: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 12px rgba(31,38,135,0.10);
  background: #181c24;
  color: #e2e8f0;
  font-family: 'Fira Mono', 'Consolas', 'Menlo', monospace;
  font-size: 1rem;
  padding: 1.2rem 1.5rem;
  overflow-x: auto;
  max-height: 320px;
  transition: box-shadow 0.18s;
  position: relative;
}
.palette-toolbar .btn, .palette-toolbar .format-btn {
  margin: 0 0.2em;
}
.palette-toolbar .btn:focus, .palette-toolbar .format-btn:focus {
  outline: 2px solid var(--brand-accent, hsl(var(--accent-hue), var(--accent-sat), var(--accent-light)));
  outline-offset: 2px;
}
.palette-toolbar .btn:hover, .palette-toolbar .format-btn:hover {
  filter: brightness(1.08);
  box-shadow: 0 2px 8px rgba(79,140,255,0.10);
}

/* Dark theme specific palette toolbar button hover */
[data-theme="dark"] .palette-toolbar .btn:hover, 
[data-theme="dark"] .palette-toolbar .format-btn:hover {
  filter: brightness(1.08);
  box-shadow: 0 2px 8px rgba(0, 158, 255, 0.2);
}
@media (max-width: 700px) {
  .palette-toolbar { flex-direction: column; gap: 0.7rem; align-items: stretch; }
  .palette-actions { justify-content: flex-end; }
  .palette-title { text-align: center; }
}
/* --- END ENTERPRISE PALETTE POLISH --- */

/* --- ENHANCED PALETTE TOOLBAR & CODE BLOCK --- */
.palette-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.2rem;
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg-glass);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 8px rgba(31,38,135,0.04);
  padding: 0.7rem 1.2rem;
}
.format-toggle {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 0.2rem 0.5rem;
}
.format-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 1rem;
  padding: 0.5em 1.1em;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  outline: none;
}
.format-btn[aria-checked="true"], .format-btn.active {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
  box-shadow: 0 2px 8px rgba(79, 195, 247, 0.3);
}

/* Dark theme specific format button active state */
[data-theme="dark"] .format-btn[aria-checked="true"], 
[data-theme="dark"] .format-btn.active {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
  box-shadow: 0 2px 8px rgba(79, 195, 247, 0.4);
}
.format-btn:focus {
  outline: 2px solid #4FC3F7;
}

/* Dark theme specific format button focus */
[data-theme="dark"] .format-btn:focus {
  outline: 2px solid #4FC3F7;
}
.palette-actions {
  display: flex;
  gap: 0.7rem;
}
#copyAllBtn, #showCodeBtn {
  min-width: 100px;
}
.palette-code-block {
  background: #181c24;
  color: #e2e8f0;
  font-family: 'Fira Mono', 'Consolas', 'Menlo', monospace;
  font-size: 1rem;
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 12px rgba(31,38,135,0.10);
  padding: 1.2rem 1.5rem;
  margin-bottom: 1.5rem;
  margin-top: 0.5rem;
  overflow-x: auto;
  max-height: 320px;
  transition: box-shadow 0.18s;
  position: relative;
}
.palette-code-block code {
  color: #e2e8f0;
  background: none;
  font-size: 1rem;
  white-space: pre;
}
@media (max-width: 700px) {
  .palette-toolbar { flex-direction: column; gap: 0.7rem; align-items: stretch; }
  .palette-actions { justify-content: flex-end; }
}
/* --- END ENHANCED PALETTE TOOLBAR & CODE BLOCK --- */

/* --- COLOR CARD REFACTOR --- */
.color-card {
  display: flex;
  align-items: center;
  gap: 1.1em;
  background: var(--bg-primary);
  border: 1.5px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 8px rgba(31,38,135,0.06);
  padding: 0.7em 1.1em;
  margin-bottom: 0.7em;
  min-width: 0;
  transition: box-shadow 0.18s, border 0.18s;
  position: relative;
}
.color-card:hover, .color-card:focus-within {
  box-shadow: 0 4px 16px rgba(79,140,255,0.13);
  border-color: var(--brand-accent, hsl(var(--accent-hue), var(--accent-sat), var(--accent-light)));
}

/* Dark theme specific color card hover */
[data-theme="dark"] .color-card:hover, 
[data-theme="dark"] .color-card:focus-within {
  box-shadow: 0 4px 16px rgba(0, 158, 255, 0.2);
  border-color: var(--color-highlight);
}
.color-sample {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  border: 1px solid var(--border-secondary);
  flex-shrink: 0;
}
.color-meta {
  display: flex;
  flex-direction: column;
  gap: 0.2em;
  min-width: 0;
  flex: 1 1 auto;
}
.color-var {
  font-size: 0.85em;
  color: var(--text-secondary);
  font-family: 'Fira Mono', 'Consolas', 'Menlo', monospace;
  margin-bottom: 0.1em;
  word-break: break-all;
}
.color-code {
  font-size: 1.08em;
  font-weight: 600;
  color: var(--text-primary);
  font-family: 'Fira Mono', 'Consolas', 'Menlo', monospace;
  word-break: break-all;
  display: flex;
  align-items: center;
  gap: 0.5em;
}
.color-copy-btn {
  background: none;
  border: none;
  color: #4FC3F7;
  font-size: 1.1em;
  cursor: pointer;
  padding: 0.1em 0.3em;
  border-radius: var(--radius-sm);
  transition: background 0.15s, color 0.15s;
  margin-left: 0.2em;
}

/* Dark theme specific color copy button */
[data-theme="dark"] .color-copy-btn {
  color: #4FC3F7;
}
.color-copy-btn:hover, .color-copy-btn:focus {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
}

/* Dark theme specific color copy button hover */
[data-theme="dark"] .color-copy-btn:hover, 
[data-theme="dark"] .color-copy-btn:focus {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
}
@media (max-width: 600px) {
  .color-card { flex-direction: column; align-items: stretch; gap: 0.5em; padding: 0.7em 0.7em; }
  .color-sample { width: 100%; height: 32px; border-radius: var(--radius-md); }
  .color-meta { align-items: flex-start; }
}
/* --- END COLOR CARD REFACTOR --- */

/* --- COLOR HOVER CARD --- */
.color-hover-card {
  display: none;
  position: absolute;
  left: 50%;
  bottom: 100%;
  transform: translateX(-50%) translateY(-12px);
  min-width: 180px;
  max-width: 260px;
  background: var(--bg-glass);
  color: var(--text-primary);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px 0 rgba(31,38,135,0.18);
  padding: 1em 1.2em 0.8em 1.2em;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s cubic-bezier(0.4,0,0.2,1), transform 0.18s cubic-bezier(0.4,0,0.2,1);
  animation: fadeSlideUp 0.22s cubic-bezier(0.4,0,0.2,1);
}
.color-card:hover .color-hover-card,
.color-card:focus-within .color-hover-card {
  display: block;
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(-22px) scale(1.04);
}
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateX(-50%) translateY(10px) scale(0.98); }
  to { opacity: 1; transform: translateX(-50%) translateY(-22px) scale(1.04); }
}
.color-hover-card-arrow {
  position: absolute;
  left: 50%;
  top: 100%;
  transform: translateX(-50%);
  width: 18px;
  height: 10px;
  pointer-events: none;
  z-index: 101;
}
.color-hover-card-arrow svg {
  display: block;
  width: 100%;
  height: 100%;
}
.color-hover-codes {
  display: flex;
  flex-direction: column;
  gap: 0.2em;
  font-family: 'Fira Mono', 'Consolas', 'Menlo', monospace;
  font-size: 1em;
  margin-bottom: 0.5em;
}
.color-hover-badge {
  display: inline-block;
  padding: 0.2em 0.7em;
  border-radius: 0.7em;
  font-size: 0.95em;
  font-weight: 700;
  margin-top: 0.2em;
}
.color-hover-badge.aaa { background: hsl(var(--success-hue), var(--success-sat), var(--success-light)); color: #fff; }
.color-hover-badge.aa { background: hsl(var(--warning-hue), var(--warning-sat), var(--warning-light)); color: #fff; }
.color-hover-badge.fail { background: hsl(var(--error-hue), var(--error-sat), var(--error-light)); color: #fff; }
@media (max-width: 600px) {
  .color-hover-card { min-width: 120px; font-size: 0.95em; }
}
/* --- END COLOR HOVER CARD --- */



/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }
  
  .logo {
    flex-direction: column;
    text-align: center;
  }
  
  .url-input-group {
    flex-direction: column;
  }
  
  .color-swatches {
    justify-content: center;
  }
  
  .tabs {
    flex-direction: column;
  }
  
  .tab-btn {
    justify-content: center;
  }
}

/* Enhanced Header Responsive Design */
@media (max-width: 1024px) {
  .header-content {
    gap: var(--space-4);
  }
  
  .logo {
    gap: var(--space-2);
  }
  
  .logo-text h1 {
    font-size: var(--font-size-2xl);
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
    min-width: 0;
  }
  .header-actions {
    flex-wrap: wrap;
    min-width: 0;
  }
  .logo {
    flex-direction: row;
    text-align: left;
    gap: var(--space-2);
  }
  .logo-text h1 {
    font-size: var(--font-size-lg);
  }
}

@media (max-width: 640px) {
  .logo-text {
    display: none;
  }
  
  .logo {
    gap: var(--space-1);
  }
  
  .logo-img {
    width: 48px;
    height: 48px;
    transform: scale(1);
  }
  
  .header-actions {
    gap: var(--space-1);
  }
  
  .export-toggle {
    min-width: 90px;
    font-size: var(--font-size-xs);
  }
  
  .export-toggle .fa-download {
    display: none;
  }
}

@media (max-width: 480px) {
  .header-content {
    padding: var(--space-2) 0;
  }
  
  .logo-img {
    width: 48px;
    height: 48px;
    transform: scale(1.1);
  }
  
  .btn-icon {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .main {
    padding: var(--space-4) 0;
  }
  
  .input-card, .loading-card, .preview-card, .palette-card {
    padding: var(--space-4);
    border-radius: var(--radius-xl);
  }
  
  .upload-area {
    padding: var(--space-6);
  }
  
  .color-swatch.large {
    width: 56px;
    height: 56px;
  }
  
  .color-swatch.medium {
    width: 40px;
    height: 40px;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-normal) ease-out;
}

.slide-in {
  animation: slideIn var(--transition-normal) ease-out;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid hsl(var(--accent-hue), var(--accent-sat), var(--accent-light));
  outline-offset: 2px;
}

/* Dark theme specific focus styles */
[data-theme="dark"] *:focus-visible {
  outline: 2px solid var(--color-highlight);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-primary: hsl(0, 0%, 0%);
    --border-secondary: hsl(0, 0%, 20%);
  }
  
  [data-theme="dark"] {
    --border-primary: hsl(0, 0%, 100%);
    --border-secondary: hsl(0, 0%, 80%);
  }
}

.app-title {
  color: #1a237e; /* Deep blue for light mode */
  background: none !important;
  -webkit-background-clip: unset !important;
  -webkit-text-fill-color: unset !important;
  background-clip: unset !important;
  text-shadow: 0 2px 8px rgba(31,38,135,0.08);
}
[data-theme="dark"] .app-title {
  color: var(--color-logo) !important;
  text-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

/* --- EXPORT DROPDOWN POLISH --- */
.export-dropdown {
  position: relative;
  display: inline-block;
}
.export-toggle {
  display: flex;
  align-items: center;
  gap: 0.5em;
  cursor: pointer;
  min-width: 110px;
  user-select: none;
}
.export-toggle .fa-caret-down {
  margin-left: 0.3em;
  font-size: 0.95em;
}
.export-menu {
  list-style: none !important;
  padding-left: 0 !important;
  margin: 0;
  position: absolute;
  top: 110%;
  right: 0;
  min-width: 160px;
  max-width: 240px;
  background: var(--bg-glass);
  border: 1.5px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: 0 6px 24px rgba(31,38,135,0.13);
  z-index: 2000;
  padding: 0.3em 0;
  margin-top: 0.2em;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px) scale(0.98);
  transition: opacity 0.18s cubic-bezier(0.4,0,0.2,1), transform 0.18s cubic-bezier(0.4,0,0.2,1);
  outline: none;
}
.export-dropdown.open .export-menu {
  display: block;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}
.export-option {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1em;
  padding: 0.7em 1.2em;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  border-radius: 0;
  font-weight: 500;
  outline: none;
}
.export-option:hover, .export-option:focus {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
}

/* Dark theme specific export option hover */
[data-theme="dark"] .export-option:hover, 
[data-theme="dark"] .export-option:focus {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
}
.export-option[aria-selected="true"] {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
}

/* Dark theme specific export option selected */
[data-theme="dark"] .export-option[aria-selected="true"] {
  background: linear-gradient(135deg, #4FC3F7, #29B6F6);
  color: white;
}
@media (max-width: 700px) {
  .export-menu {
    right: auto;
    left: 0;
    min-width: 120px;
    max-width: 98vw;
  }
}

@media (max-width: 640px) {
  .export-menu {
    min-width: 100px;
    max-width: 90vw;
  }
  
  .export-option {
    padding: 0.5em 0.8em;
    font-size: var(--font-size-xs);
  }
}
@media (max-width: 480px) {
  .export-menu {
    min-width: 100px;
    font-size: 0.95em;
  }
}
/* --- END EXPORT DROPDOWN POLISH --- */

.all-colors-container {
  width: 100vw;
  max-width: 100vw;
  margin-left: 50%;
  transform: translateX(-50%);
  background: var(--bg-glass);
  box-shadow: 0 4px 24px rgba(31,38,135,0.07);
  border-radius: var(--radius-lg);
  padding: 2.2rem 2rem 2.5rem 2rem;
  margin-top: 2.5rem;
  margin-bottom: 2.5rem;
  overflow-x: auto;
}
@media (max-width: 900px) {
  .all-colors-container {
    padding: 1.2rem 0.5rem 1.5rem 0.5rem;
  }
}
#allColors .color-swatches {
  display: grid !important;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)) !important;
  gap: 1.1em !important;
  flex-wrap: unset !important;
  flex-direction: unset !important;
  align-items: unset !important;
  justify-content: unset !important;
}
#allColors .color-card {
  width: 100%;
  min-width: 0;
}