/* Generator – Snipzy design language. No external UI libraries. */

/* CSS Variables – aligned with main site */
:root {
  --bg-primary-light: #f8f9fa;
  --bg-secondary-light: #ffffff;
  --text-primary-light: #1a1a1a;
  --text-secondary-light: #4a4a4a;
  --accent-light: #3498db;
  --accent-hover-light: #2980b9;
  --border-light: #e0e0e0;
  --code-bg-light: #f1f3f5;
  --card-shadow-light: 0 4px 6px rgba(0, 0, 0, 0.05);
  --header-bg-light: rgba(255, 255, 255, 0.8);

  --bg-primary-dark: #121212;
  --bg-secondary-dark: #1e1e1e;
  --text-primary-dark: #f0f0f0;
  --text-secondary-dark: #b0b0b0;
  --accent-dark: #4dabf7;
  --accent-hover-dark: #74c0fc;
  --border-dark: #333333;
  --code-bg-dark: #2d2d2d;
  --card-shadow-dark: 0 4px 6px rgba(0, 0, 0, 0.2);
  --header-bg-dark: rgba(30, 30, 30, 0.8);

  --bg-primary: var(--bg-primary-light);
  --bg-secondary: var(--bg-secondary-light);
  --text-primary: var(--text-primary-light);
  --text-secondary: var(--text-secondary-light);
  --accent: var(--accent-light);
  --accent-hover: var(--accent-hover-light);
  --border: var(--border-light);
  --code-bg: var(--code-bg-light);
  --card-shadow: var(--card-shadow-light);
  --header-bg: var(--header-bg-light);

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-xxl: 3rem;

  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-xxl: 2rem;
  --font-size-xxxl: 3rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;

  /* For sticky preview (clear header) */
  --header-height: 72px;
}

.dark-mode {
  --bg-primary: var(--bg-primary-dark);
  --bg-secondary: var(--bg-secondary-dark);
  --text-primary: var(--text-primary-dark);
  --text-secondary: var(--text-secondary-dark);
  --accent: var(--accent-dark);
  --accent-hover: var(--accent-hover-dark);
  --border: var(--border-dark);
  --code-bg: var(--code-bg-dark);
  --card-shadow: var(--card-shadow-dark);
  --header-bg: var(--header-bg-dark);
}

/* Reset & base */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

button {
  cursor: pointer;
  font-family: inherit;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Header */
.site-header {
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo span {
  color: var(--accent);
}
.logo-img {
  height: 28px; /* or whatever fits your design */
  width: auto;
}

.nav-menu {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-menu a {
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 0%;
  height: 2px;
  background-color: var(--accent);
  transition: width var(--transition-normal);
}

.nav-menu a:hover::after {
  width: 100%;
}

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-size-lg);
  padding: var(--space-sm);
  border-radius: 50%;
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.dark-mode .theme-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-size-xl);
}


/* Page header – gradient like submit/terms */
.page-header {
  background: linear-gradient(135deg, var(--accent), #9b59b6);
  padding: var(--space-xl) 0;
  text-align: center;
  margin-bottom: var(--space-xl);
}

.page-header h1 {
  font-size: var(--font-size-xxxl);
  margin-bottom: var(--space-sm);
  color: #fff;
  font-weight: 700;
}

.page-header p {
  font-size: var(--font-size-lg);
  max-width: 700px;
  margin: 0 auto;
  color: rgba(255, 255, 255, 0.9);
}

/* Generator layout: two columns on desktop. Preview sticks so it travels with the user. */
.generator-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
  margin-bottom: var(--space-xxl);
}

.controls-panel,
.preview-panel {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  padding: var(--space-xl);
  transition: box-shadow var(--transition-normal);
  contain: none;
}

.controls-panel:hover,
.preview-panel:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.dark-mode .controls-panel:hover,
.dark-mode .preview-panel:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

/* Preview stays visible while scrolling (travels with the user) */
.preview-panel {
  position: sticky;
  top: calc(var(--header-height, 72px) + var(--space-md));
  max-height: calc(100vh - var(--header-height, 72px) - var(--space-xl));
  display: flex;
  flex-direction: column;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.preview-header .panel-title {
  margin-bottom: 0;
}

.preview-bg-toggle {
  display: flex;
  gap: 2px;
}

.preview-bg-btn {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.preview-bg-btn:first-child { border-radius: var(--radius-sm) 0 0 var(--radius-sm); }
.preview-bg-btn:last-child { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.preview-bg-btn:only-child { border-radius: var(--radius-sm); }

.preview-bg-btn:hover {
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.05);
}

.preview-bg-btn.active {
  color: var(--accent);
  background: rgba(52, 152, 219, 0.1);
  border-color: var(--accent);
}

.dark-mode .preview-bg-btn:hover {
  background: rgba(255, 255, 255, 0.05);
}

.preview-panel .panel-title {
  flex-shrink: 0;
}

/* Background is a separate layer so it never affects the button; only the backdrop changes */
/* Isolated so the button only composites with the backdrop (matches real light/dark page) */
.preview-area {
  flex: 1;
  min-height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
  background: none;
}

/* Backdrop layer only – Dark / Light / Checker change only this */
.preview-area::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  border-radius: inherit;
  pointer-events: none;
  background-color: #1a1a1a;
}

.preview-area.preview-bg-dark::after {
  background-color: #1a1a1a;
  background-image: none;
}

.preview-area.preview-bg-light::after {
  background-color: #f8f9fa;
  background-image: none;
}

.preview-area.preview-bg-checker::after {
  background-color: #555;
  background-image: linear-gradient(45deg, #3a3a3a 25%, transparent 25%),
    linear-gradient(-45deg, #3a3a3a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #3a3a3a 75%),
    linear-gradient(-45deg, transparent 75%, #3a3a3a 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

/* Button stays on top of backdrop so its look doesn’t change */
/* Keep preview design constant: no blending or glass so Dark/Light/Checker only change the backdrop */
.preview-area .button-preview {
  position: relative;
  z-index: 1;
  mix-blend-mode: normal !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

.preview-area::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 2;
  border-radius: inherit;
  border: 1px dashed var(--border);
  pointer-events: none;
}

.dark-mode .preview-area::before {
  border-color: rgba(255, 255, 255, 0.08);
}

.panel-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.panel-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.controls-actions {
  margin-bottom: var(--space-lg);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.btn-undo,
.btn-redo,
.btn-random,
.btn-reset {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.btn-undo,
.btn-redo {
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
}

.btn-undo:hover,
.btn-redo:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.btn-undo:disabled,
.btn-redo:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-undo:focus-visible,
.btn-redo:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn-random {
  color: var(--accent);
  background: rgba(52, 152, 219, 0.1);
  border: 1px solid var(--accent);
}

.btn-random:hover {
  background: rgba(52, 152, 219, 0.2);
}

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

.btn-random.randomizing {
  animation: random-pulse 0.3s ease;
}

@keyframes random-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.btn-reset {
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
}

.btn-reset:hover {
  color: var(--accent);
  border-color: var(--accent);
  background-color: rgba(52, 152, 219, 0.06);
}

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

.dark-mode .btn-reset:hover {
  background-color: rgba(77, 171, 247, 0.08);
}

.saved-indicator {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  opacity: 0;
  transition: opacity var(--transition-fast);
  align-self: center;
}

.saved-indicator.visible {
  opacity: 1;
}

/* Control sections (grouped options) */
.control-section {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border);
}

.control-section:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.control-section-header {
  display: block;
}

.control-section-chevron {
  display: none;
}

.control-section-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.control-section-desc {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.4;
}

.control-section-glow {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-md);
  margin-left: calc(-1 * var(--space-md));
  padding-left: calc(var(--space-md) + var(--space-sm));
}

.control-section-hover {
  border-left: 3px solid #9b59b6;
  padding-left: calc(var(--space-md) + var(--space-sm));
  margin-left: calc(-1 * var(--space-md));
}

.control-section-tricks {
  border-left: 3px solid #27ae60;
  padding-left: calc(var(--space-md) + var(--space-sm));
  margin-left: calc(-1 * var(--space-md));
}

.control-hint {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin-top: var(--space-xs);
}

.control-section-body {
  height: auto;
}

/* Glow preview swatch – shows glow at current density */
.glow-swatch {
  width: 100%;
  height: 32px;
  margin-top: var(--space-sm);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background-color: var(--code-bg);
}

.dark-mode .glow-swatch {
  background-color: #1a1a1a;
}

/* Form controls – match submit.css form-group style */
.control-group {
  margin-bottom: var(--space-lg);
}

.control-group label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.control-value {
  color: var(--accent);
  font-weight: 600;
}

.control-group input[type="text"],
.control-group input[type="number"],
.control-group textarea,
.control-group select {
  width: 100%;
  padding: var(--space-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  resize: none;
}

.control-group input:focus,
.control-group textarea:focus,
.control-group select:focus {
  outline: none;
}

.control-group input:focus-visible,
.control-group textarea:focus-visible,
.control-group select:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.35);
}

.color-wrap input[type="color"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Color inputs: swatch + hex text */
.color-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.color-wrap input[type="color"] {
  width: 48px;
  height: 40px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  cursor: pointer;
}

.color-wrap .color-hex {
  flex: 1;
  min-width: 0;
}

/* Selects – use native browser select */
.control-group select {
  -webkit-appearance: auto;
  appearance: auto;
  padding: var(--space-md);
  cursor: pointer;
  background-image: none;
  border: 1px solid var(--border);
  width: 100%;
  height: auto;
  position: relative;
  z-index: 999;
}

.control-group select:hover {
  border-color: var(--text-secondary);
}

.control-group select:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.35);
}

/* Range inputs – touch friendly */
.control-group input[type="range"] {
  width: 100%;
  height: 8px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 4px;
  margin-top: var(--space-xs);
}

.control-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.control-group input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.control-group input[type="range"]:focus-visible {
  outline: none;
}

.control-group input[type="range"]:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent);
}

.control-group input[type="range"]:focus-visible::-moz-range-thumb {
  box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent);
}

/* Checkbox – modern custom look */
.control-group-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
}

.control-group-checkbox input[type="checkbox"] {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  min-width: 22px;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: var(--bg-primary);
  cursor: pointer;
  position: relative;
  transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.control-group-checkbox input[type="checkbox"]:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.15);
}

.control-group-checkbox input[type="checkbox"]:checked {
  background-color: var(--accent);
  border-color: var(--accent);
}

.control-group-checkbox input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 6px;
  top: 2px;
  width: 6px;
  height: 11px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.control-group-checkbox input[type="checkbox"]:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--accent);
}

.control-group-checkbox label {
  margin-bottom: 0;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-primary);
  user-select: none;
}

.dark-mode .control-group-checkbox input[type="checkbox"]:hover {
  box-shadow: 0 0 0 2px rgba(77, 171, 247, 0.2);
}

.dark-mode .control-group-checkbox input[type="checkbox"]:checked {
  background-color: var(--accent);
  border-color: var(--accent);
}

/* Preview button – styles applied by JS; base only */
.button-preview {
  border: none;
  cursor: default;
  font-family: var(--font-family);
  font-weight: 500;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal), filter var(--transition-normal);
}

/* Code section – same structure as snippet page (glowing-button.html) */
.snippet-code-section {
  padding: var(--space-xl) 0;
  margin-bottom: var(--space-xxl);
}

.snippet-code-section .section-heading {
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-xl);
}

.code-section-toggle {
  display: none;
  padding: var(--space-md);
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
  margin-bottom: var(--space-sm);
}

.code-section-toggle:hover {
  background-color: rgba(52, 152, 219, 0.1);
}

.code-output {
  display: block;
}

.code-output.collapsed {
  display: none;
}

/* Code block – same design as glowing-button.html */
.code-output .code-block {
  position: relative;
  margin: var(--space-lg) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background-color: var(--code-bg);
}

.code-output .code-header {
  background-color: rgba(0, 0, 0, 0.1);
  padding: var(--space-sm) var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.dark-mode .code-output .code-header {
  background-color: rgba(255, 255, 255, 0.06);
}

.code-output .code-language {
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.code-output .copy-button {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.code-output .copy-button:hover {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--text-primary);
}

.dark-mode .code-output .copy-button:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.code-output .code-block pre {
  margin: 0;
  padding: 1em;
  overflow-x: auto;
  overflow-y: auto;
}

.code-output .code-block code {
  font-size: 0.875em;
}

.code-output .copy-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Mobile only: tab bar hidden on desktop */
.generator-tabs {
  display: none;
}

/* Back to Top Button */
.back-to-top-button {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--accent);
  color: white;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity 0.35s ease-out, visibility 0.35s ease-out, transform 0.35s ease-out, background-color 0.2s, box-shadow 0.2s;
  z-index: 99;
}

.back-to-top-button.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top-button i {
  transition: transform 0.25s ease-out;
}

.back-to-top-button:hover {
  background-color: var(--accent-hover);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25);
}

.back-to-top-button:hover i {
  transform: translateY(-2px);
}

.back-to-top-button.clicked {
  animation: back-to-top-go-up 0.9s ease-out;
  background-color: var(--accent-hover);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.back-to-top-button.clicked i {
  animation: back-to-top-arrow-up 0.9s ease-out;
}

@keyframes back-to-top-go-up {
  0% { transform: translateY(0) scale(1); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2); }
  15% { transform: translateY(-8px) scale(1.05); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25); }
  35% { transform: translateY(-4px) scale(1.02); }
  100% { transform: translateY(0) scale(1); box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2); }
}

@keyframes back-to-top-arrow-up {
  0% { transform: translateY(0); opacity: 1; }
  20% { transform: translateY(-6px); opacity: 0.9; }
  50% { transform: translateY(-10px); opacity: 0.5; }
  80% { transform: translateY(-4px); opacity: 0.85; }
  100% { transform: translateY(0); opacity: 1; }
}

.dark-mode .back-to-top-button { box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4); }
.dark-mode .back-to-top-button:hover { box-shadow: 0 6px 16px rgba(0, 0, 0, 0.5); }
.dark-mode .back-to-top-button.clicked { box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35); }

@media (prefers-reduced-motion: reduce) {
  .back-to-top-button, .back-to-top-button i { transition-duration: 0.15s; }
  .back-to-top-button.clicked, .back-to-top-button.clicked i { animation-duration: 0.3s; }
}

/* Footer */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: var(--space-xl) 0;
  margin-top: auto;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.shortcuts-hint {
  margin-top: var(--space-xs);
  font-size: var(--font-size-xs);
  opacity: 0.85;
}

.shortcuts-hint kbd {
  display: inline-block;
  padding: 0.1em 0.4em;
  font-family: inherit;
  font-size: 0.9em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.copyright {
  margin-top: var(--space-md);
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
}

/* Responsive: mobile – tab system [ Controls | Preview | Code ] */
@media (max-width: 768px) {
  .generator-tabs {
    display: flex;
    gap: 0;
    margin: 0 0 var(--space-md);
    padding: 0;
    border-bottom: 2px solid var(--border);
    background: var(--bg-secondary);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    overflow: hidden;
  }

  .generator-tab {
    flex: 1;
    padding: var(--space-md) var(--space-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
  }

  .generator-tab:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
  }

  .generator-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background: rgba(52, 152, 219, 0.06);
  }

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

  .dark-mode .generator-tab:hover {
    background: rgba(255, 255, 255, 0.04);
  }

  .dark-mode .generator-tab.active {
    background: rgba(77, 171, 247, 0.1);
  }

  .generator-layout {
    grid-template-columns: 1fr;
    gap: 0;
    position: relative;
    margin-bottom: var(--space-lg);
    align-content: start;
    overflow: visible;
  }

  #generator-container[data-active-tab="preview"] .generator-layout {
    margin-bottom: var(--space-md);
  }

  .controls-panel,
  .preview-panel,
  .snippet-code-section {
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
  }

  #generator-container[data-active-tab="controls"] .preview-panel,
  #generator-container[data-active-tab="controls"] .snippet-code-section,
  #generator-container:not([data-active-tab]) .preview-panel,
  #generator-container:not([data-active-tab]) .snippet-code-section {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(10px);
  }

  #generator-container[data-active-tab="preview"] .controls-panel,
  #generator-container[data-active-tab="preview"] .snippet-code-section {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(10px);
  }

  #generator-container[data-active-tab="code"] .generator-layout .controls-panel,
  #generator-container[data-active-tab="code"] .generator-layout .preview-panel {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(10px);
  }

  #generator-container[data-active-tab="controls"] .controls-panel,
  #generator-container:not([data-active-tab]) .controls-panel {
    position: relative;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  #generator-container[data-active-tab="preview"] .preview-panel {
    position: relative;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  #generator-container[data-active-tab="code"] .snippet-code-section {
    position: relative;
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  #generator-container[data-active-tab="code"] .generator-layout {
    display: none;
  }

  .controls-panel,
  .preview-panel {
    max-width: 100%;
    padding: var(--space-md) var(--space-lg);
    contain: none;
    overflow: visible;
  }

  .preview-panel {
    position: relative;
    top: auto;
    max-height: none;
    min-height: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-md) var(--space-lg);
    padding-bottom: var(--space-md);
  }

  .preview-header {
    margin-bottom: var(--space-sm);
    gap: var(--space-xs);
    flex-shrink: 0;
  }

  .preview-header .panel-title {
    font-size: var(--font-size-md);
  }

  .preview-area {
    flex: 0 0 auto;
    min-height: 220px;
    max-height: min(72vh, 420px);
    padding: var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
  }

  #generator-container[data-active-tab="preview"] .preview-panel {
    padding-bottom: var(--space-sm);
  }

  .page-header h1 {
    font-size: var(--font-size-xxl);
  }

  .page-header p {
    font-size: var(--font-size-md);
  }

  .snippet-code-section {
    padding: var(--space-lg) 0;
  }

  .code-section-toggle {
    display: block;
  }

  .code-section-toggle::after {
    content: ' \25BC';
    font-size: 0.8em;
  }

  .code-section-toggle.collapsed::after {
    content: ' \25B6';
  }

  .code-output.collapsed {
    display: none;
  }

  .code-output .code-block pre {
    font-size: 14px;
    max-height: 50vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .control-section {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: 1px solid var(--border);
    overflow: visible;
  }

  .control-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: calc(var(--space-sm) + 2px) 0;
    cursor: pointer;
    text-align: left;
    background: none;
    border: none;
    font: inherit;
    color: inherit;
    transition: background-color var(--transition-fast), color var(--transition-fast);
  }

  .control-section-header:hover,
  .control-section-header:focus-visible {
    background-color: rgba(0, 0, 0, 0.04);
    outline: none;
  }

  .dark-mode .control-section-header:hover,
  .dark-mode .control-section-header:focus-visible {
    background-color: rgba(255, 255, 255, 0.06);
  }

  .control-section-header:focus-visible {
    outline: 3px solid rgba(79, 129, 255, 0.3);
    outline-offset: 3px;
  }

  .control-section-chevron {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: transform 0.25s ease-out;
    flex-shrink: 0;
    margin-left: var(--space-sm);
  }

  .control-section.open .control-section-chevron {
    transform: rotate(180deg);
  }

  .control-section-body {
    overflow: hidden;
    max-height: 0;
    padding: 0;
    opacity: 0;
    transition: max-height 0.35s ease, opacity 0.35s ease, padding 0.35s ease;
  }

  .control-section.open .control-section-body {
    max-height: 1400px;
    opacity: 1;
    padding: var(--space-sm) 0 var(--space-lg);
  }

  @media (prefers-reduced-motion: reduce) {
    .control-section-chevron,
    .control-section-body {
      transition-duration: 0.12s;
    }
  }

  .control-section-title {
    font-size: 0.8125rem;
    margin-bottom: 0;
  }

  @media (min-width: 768px) {
    .control-section-body {
      max-height: 1400px;
      opacity: 1;
      padding: var(--space-sm) 0 var(--space-lg);
    }

    .control-section:not(.open) .control-section-body {
      max-height: 1400px;
      opacity: 1;
      padding: var(--space-sm) 0 var(--space-lg);
    }
  }

  .control-section-body .control-section-desc {
    margin-top: 0;
    padding-top: 0;
  }

  .controls-actions {
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
  }

  .shortcuts-hint {
    display: none;
  }

  .back-to-top-button {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }

  /* Mobile tab content improvements */
  #generator-container[data-active-tab="controls"] .controls-panel {
    z-index: 10;
    position: relative;
  }

  #generator-container[data-active-tab="preview"] .preview-panel {
    z-index: 10;
    position: relative;
  }

  #generator-container[data-active-tab="code"] .snippet-code-section {
    z-index: 10;
    position: relative;
  }

  /* Allow dropdown options to overflow on mobile */
  .controls-panel select {
    position: relative;
    z-index: 999;
    pointer-events: auto;
  }

  .control-group {
    position: relative;
    z-index: auto;
    overflow: visible;
  }

  /* Ensure native select works on mobile */
  .control-group select,
  select {
    -webkit-appearance: auto !important;
    appearance: auto !important;
    position: relative !important;
    z-index: 999 !important;
    pointer-events: auto !important;
    width: 100% !important;
    height: auto !important;
  }
}

/* Extra small: larger touch targets */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .preview-panel {
    padding: var(--space-sm);
  }

  .preview-area {
    min-height: 180px;
    max-height: min(65vh, 360px);
    padding: var(--space-md);
  }

  .control-group input[type="range"]::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
  }

  .control-group input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
  }
}

/* Prefer reduced motion: fewer transitions */
@media (prefers-reduced-motion: reduce) {
  .button-preview,
  .controls-panel,
  .preview-panel {
    transition: none;
  }
}