:root {
    /* Color Palette */
    --color-background: #222222;
    --color-surface: #2d2d2d;
    --color-surface-raised: #353535;
    --color-text: #f2f2f2;
    --color-text-secondary: #bababa;
    --color-border: #444444;
    
    /* Mondrian Colors */
    --color-mondrian-white: rgb(252, 250, 242);
    --color-mondrian-red: rgb(252, 3, 3);
    --color-mondrian-blue: rgb(30, 30, 235);
    --color-mondrian-yellow: rgb(252, 229, 23);
    --color-mondrian-black: rgb(0, 0, 0);
    /* UI State Colors */
    --color-btn-hover: #e00303;
    --color-btn-disabled: #772222;
    --color-slider-thumb-hover: #fce517;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition-default: all 300ms ease;
    
    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    
    /* Other */
    --max-width: 800px;
    --header-height: 50px;
  }
  
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'IBM Plex Mono', monospace;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    text-align: center;
  }
  
  .app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    align-items: center;
  }
  
  /* Header Styles */
  header {
  background-color: var(--color-surface);
  color: var(--color-text);
  padding: 0 var(--spacing-lg);
  display: flex;
  flex-direction: row;
  align-items: center;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100vw;
  min-width: 100vw;
  box-sizing: border-box;
}

header h1 {
  color: var(--color-text);
}

footer {
  background-color: var(--color-surface);
  padding: var(--spacing-md);
  border-top: 1px solid var(--color-border);
  width: 100vw;
  min-width: 100vw;
  margin-top: auto;
  position: relative;
  box-sizing: border-box;
}


  .header-content {
    display: flex;
    align-items: flex-end;
    gap: 20px;
  }

  .toggle-container {
    margin-left: auto;
    display: flex;
    align-items: center;
    height: 100%;
  }
  
  .logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
  }
  
  .mondrian-icon {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 2px;
    width: 32px;
    height: 32px;
    border: 2px solid var(--color-mondrian-black);
  }
  
  .mondrian-icon .square {
    width: 100%;
    height: 100%;
  }
  
  .square.red {
    background-color: var(--color-mondrian-red);
  }
  
  .square.blue {
    background-color: var(--color-mondrian-blue);
  }
  
  .square.yellow {
    background-color: var(--color-mondrian-yellow);
  }
  
  .square.white {
    background-color: var(--color-mondrian-white);
  }
  
  h1 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
  }
  
  /* Main Content */
  main {
    flex: 1;
    padding: var(--spacing-lg) var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
  }
  
  .section {
    margin-bottom: var(--spacing-xl);
    scroll-margin-top: var(--header-height);
  }
  
  .section-content {
    background: transparent;
    border-radius: 0;
    padding: var(--spacing-md);
    border: none;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    transition: none;
  }
  
  h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
    color: var(--color-mondrian-white);
    border-bottom: 2px solid var(--color-mondrian-yellow);
    padding-bottom: var(--spacing-sm);
    display: inline-block;
  }
  
  h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    font-weight: 500;
    color: var(--color-mondrian-white);
  }
  
  /* Generator Controls */
  .generator-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0.5em 0 1.5em 0;
    gap: 0.7em;
  }
  
  .input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  .slider-spacer {
    font-size: 1rem;
    width: 80px;
    height: 10px;
    transition: var(--transition-default);
    text-align: center;
  }
  
  input[type="number"]:focus {
    outline: none;
    border-color: var(--color-mondrian-blue);
  }
  
  :root {
  --toggle-bg: #e0e0e0;
  --toggle-border: #bbb;
  --toggle-knob: #222;
  --toggle-bg-active: #222;
  --toggle-border-active: #222;
  --toggle-knob-active: #fff;

[data-theme="dark"] {
  --toggle-bg: #444;
  --toggle-border: #aaa;
  --toggle-knob: #fff;
  --toggle-bg-active: #fff;
  --toggle-border-active: #fff;
  --toggle-knob-active: #222;
}

/* Toggle Switch Styles */
  .switch {
  position: relative;
  display: inline-block;
  width: 56px;
  height: 32px;
  overflow: visible;
  vertical-align: middle;
  box-sizing: border-box;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  margin-top: 0 !important;
  margin-bottom: 0 !important;
  background-color: var(--toggle-bg, #e0e0e0);
  transition: background 0.4s, border-color 0.4s;
  border-radius: 999px;
  border: 2px solid var(--toggle-border, #bbb);
  box-sizing: border-box;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.slider:before {
  position: absolute;
  content: "";
  height: 24px;
  width: 24px;
  left: 4px;
  top: 50%;
  transform: translateY(-50%);
  background-color: var(--toggle-knob, #fff);
  transition: 0.4s cubic-bezier(.4,2,.6,1);
  border-radius: 50%;
  box-shadow: 0 1px 4px rgba(0,0,0,0.13);
  box-sizing: border-box;
}

input:checked + .slider:before {
  left: 28px;
  transform: translateY(-50%);
  background-color: var(--toggle-knob-active, #fff);
}

/* Remove any other input:checked + .slider:before rules elsewhere in the file to prevent conflicts */

input:checked + .slider {
  background-color: var(--toggle-bg-active, #222);
  border-color: var(--toggle-border-active, #222);
}

input:checked + .slider:before {
  left: 28px;
  transform: translateY(-50%);
  background-color: var(--toggle-knob-active, #fff);
}

/* Grid Size Range Slider Styles */
.range-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 160px;
  height: 6px;
  background: var(--slider-track-bg, #eee);
  border-radius: 6px;
  outline: none;
  margin: 0 0.5em;
  transition: background 0.3s;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

:root[data-theme="dark"] {
  --slider-track-bg: #eee;
}
:root[data-theme="light"] {
  --slider-track-bg: #222;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-mondrian-red);
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: background 0.3s, border 0.3s;
}
.range-slider:focus::-webkit-slider-thumb {
  outline: none;
  border: 2px solid var(--color-mondrian-blue);
}
.range-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-mondrian-red);
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: background 0.3s, border 0.3s;
}
.range-slider:focus::-moz-range-thumb {
  outline: none;
  border: 2px solid var(--color-mondrian-blue);
}
.range-slider::-ms-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-mondrian-red);
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: background 0.3s, border 0.3s;
}
.range-slider:focus::-ms-thumb {
  outline: none;
  border: 2px solid var(--color-mondrian-blue);
}
.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-mondrian-red);
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: background 0.3s, border 0.3s;
}
.range-slider:focus::-webkit-slider-thumb,
.range-slider:active::-webkit-slider-thumb {
  background: var(--color-mondrian-yellow);
  border: 2px solid var(--color-border);
}
.range-slider::-webkit-slider-thumb:hover {
  background: var(--color-slider-thumb-hover);
}

.range-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-mondrian-red);
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: background 0.3s, border 0.3s;
}
.range-slider:focus::-moz-range-thumb,
.range-slider:active::-moz-range-thumb {
  background: var(--color-mondrian-yellow);
  border: 2px solid var(--color-border);
}
.range-slider::-moz-range-thumb:hover {
  background: var(--color-slider-thumb-hover);
}

.range-slider::-ms-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-mondrian-red);
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: background 0.3s, border 0.3s;
}
.range-slider:focus::-ms-thumb,
.range-slider:active::-ms-thumb {
  background: var(--color-mondrian-yellow);
  border: 2px solid var(--color-border);
}
.range-slider::-ms-thumb:hover {
  background: var(--color-slider-thumb-hover);
}

.range-slider:focus {
  outline: none;
  /* No background color change on focus */
}

.range-slider::-ms-fill-lower {
  background: #eee;
  border-radius: 6px;
}
.range-slider::-ms-fill-upper {
  background: #eee;
  border-radius: 6px;
}

/* === Generic Slider Styles (old, for reference) === */

/* Slider styles */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--color-surface-raised);
  outline: none;
  opacity: 0.9;
  transition: opacity 0.2s;
}

input[type="range"]:hover {
  opacity: 1;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-mondrian-red);
  cursor: pointer;
  transition: var(--transition-default);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-mondrian-red);
  cursor: pointer;
  transition: var(--transition-default);
}

input[type="range"]::-webkit-slider-thumb:hover {
  background: #e00303;
  transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb:hover {
  background: #e00303;
  transform: scale(1.1);
}

input[type="range"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

input[type="range"]:disabled::-webkit-slider-thumb {
  background: #772222;
  cursor: not-allowed;
}

input[type="range"]:disabled::-moz-range-thumb {
  background: #772222;
  cursor: not-allowed;
}

.generate-btn {
  font-family: 'IBM Plex Mono', monospace;
  background-color: var(--color-mondrian-red);
  color: var(--color-mondrian-white);
  border: none;
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-default);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  height: 40px;
  margin: 0 auto;
  position: relative;
}

.generate-btn .pinwheel {
  width: 20px;
  height: 20px;
  border: 3px solid var(--color-mondrian-white);
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 1s linear infinite;
  margin-right: 8px;
}

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

.generate-btn .button-text {
  display: flex;
  align-items: center;
  gap: 8px;
}

.generate-btn:hover {
  background-color: var(--color-btn-hover);
  transform: translateY(-2px);
}

.generate-btn:disabled {
  background-color: var(--color-btn-disabled);
  cursor: not-allowed;
  transform: none;
  opacity: 0.7;
}

.generate-button-container {
  margin-top: var(--spacing-md);
  display: flex;
  justify-content: center;
}

/* Result Container */
.result-container {
  margin-top: var(--spacing-lg);
}

.error-message {
  background-color: rgba(255, 0, 0, 0.1);
  border: 1px solid rgba(255, 0, 0, 0.3);
  color: #ff6b6b;
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--spacing-lg);
}

.art-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.image-container {
  position: relative;
  max-width: 100%;
  border: 5px solid var(--color-mondrian-black);
  background-color: var(--color-mondrian-white);
}

.image-container img {
  max-width: 100%;
  display: block;
}

.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
}

.loader {
  width: 40px;
  height: 40px;
  border: 5px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--color-mondrian-yellow);
  animation: spin 1s infinite linear;
}

/* Feedback Controls */
.feedback-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
}

.feedback-controls .buttons {
  display: flex;
  gap: var(--spacing-xl);
}

.feedback-btn {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-default);
  color: var(--color-text);
  width: 60px;
  height: 60px;
}

.feedback-btn:hover {
  background-color: var(--color-surface);
  transform: translateY(-2px);
}

.thumb-icon {
  font-size: 1.5rem;
  line-height: 1;
  /* Since we can't use emojis per requirements, just using text for representation */
  /* Will be replaced with custom SVG icons in a real project */
  font-style: normal;
  opacity: 0;
}

.thumb-up::after {
  content: '↑';
  color: var(--color-mondrian-blue);
  opacity: 1;
  font-size: 2rem;
}

.thumb-down::after {
  content: '↓';
  color: var(--color-mondrian-red);
  opacity: 1;
  font-size: 2rem;
}

.feedback-message {
  padding: var(--spacing-md);
  background-color: var(--color-surface-raised);
  border-radius: var(--border-radius-md);
  text-align: center;
  color: var(--color-mondrian-blue);
}

/* Non-Generator Sections (Donate, About) */
#donate, #about {
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

#about p {
  margin-bottom: var(--spacing-md);
  text-align: left;
}

/* Donate Section */
.donate-btn {
  display: inline-block;
  background-color: var(--color-mondrian-blue);
  color: var(--color-mondrian-white);
  text-decoration: none;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-sm);
  font-weight: 500;
  margin: var(--spacing-md) 0 var(--spacing-lg);
  transition: var(--transition-default);
}

.donate-btn:hover {
  background-color: #2828cc;
  transform: translateY(-2px);
}

.donation-placeholder {
  background-color: var(--color-surface-raised);
  border: 1px dashed var(--color-border);
  padding: var(--spacing-lg);
  text-align: center;
  border-radius: var(--border-radius-md);
  margin-top: var(--spacing-md);
}

.note {
  color: var(--color-text-secondary);
  font-style: italic;
  font-size: 0.9rem;
}

/* Footer */
footer {
  background-color: var(--color-surface);
  padding: 2.5em 0 2.5em 0; /* Increased top and bottom padding */
  border-top: 1px solid var(--color-border);
  width: 100%;
  margin-top: auto;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  font-size: 0.7rem;
}

footer a {
  color: var(--color-mondrian-blue);
  text-decoration: none;
  transition: var(--transition-default);
}

footer a:hover {
  color: var(--color-mondrian-blue);
}

.made-with {
  margin-top: var(--spacing-sm);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

/* Responsive Styles */
@media (max-width: 768px) {
  .app-container, main, .section-content {
    max-width: 100% !important;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
    box-sizing: border-box;
  }

  .generator-controls {
    flex-direction: column;
    align-items: center;
  }
  
  .input-group {
    width: 100%;
    align-items: center;
  }
  
  .generate-btn {
  font-family: 'IBM Plex Mono', monospace;
  width: 100%;
  margin-top: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  main {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .section-content {
    padding: var(--spacing-md);
  }
  
  .feedback-controls .buttons {
    gap: var(--spacing-lg);
  }
  
  .feedback-btn {
    width: 50px;
    height: 50px;
  }
}