/* ============================================================================
   GLYPHTRIX - STYLESHEET
   ============================================================================
   
   Table of Contents:
   1. IMPORTS & FONTS
   2. CSS CUSTOM PROPERTIES (VARIABLES)
   3. BASE & RESET STYLES
   4. LAYOUT - MAIN CONTAINERS
   5. LAYOUT - INPUT & OUTPUT COLUMNS
   6. LAYOUT - CANVAS & MEDIA ELEMENTS
   7. UPLOAD COMPONENTS
   8. SETTINGS PANEL
   9. FORM CONTROLS & INPUTS
   10. BUTTONS
   11. MODALS
   12. MOBILE COMPONENTS
   13. BRANDING
   14. RESPONSIVE DESIGN - TABLET (769px - 1600px)
   15. RESPONSIVE DESIGN - MOBILE (max 768px)
   16. RESPONSIVE DESIGN - LARGE SCREENS
   17. ANIMATIONS
   
   ============================================================================ */


/* ============================================================================
   1. IMPORTS & FONTS
   ============================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Victor+Mono:wght@400;700&family=Source+Code+Pro:wght@400;700&family=Bytesized:wght@400&family=VT323&family=Cutive+Mono&family=Doto:wght@100..900&family=Workbench:wght@400&display=swap');


/* ============================================================================
   2. CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================================================ */

:root {
  /* Primary Colors */
  --primary-bg: #000;
  --primary-text: #fff;
  --primary-white: #fff;
  
  /* Border Colors */
  --border-primary: #555;
  --border-secondary: #333;
  --border-light: #111;
  
  /* Hover States */
  --hover-grey: #1d1d1d;
  --hover-red: #440000;
  --hover-red-dark: #660000;
  
  /* Status Colors */
  --error-text: #FF6666;
  --muted-grey: #7e7e7e;
  --dark-grey: #111111;
  --disabled-red: #220000;
  
  /* Accent Colors */
  --accent-dark: #0e0e0e;
  --overlay-bg: rgba(0, 0, 0, 0.8);
  --overlay-dark: rgba(0, 0, 0, 0.85);
  
  /* Drag States */
  --drag-hover: #444;
  --drag-default: #333;
}


/* ============================================================================
   3. BASE & RESET STYLES
   ============================================================================ */

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

html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  font-family: "Courier New", Courier, monospace;
  background-color: var(--primary-bg);
  color: var(--primary-text);
}

body {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}


/* ============================================================================
   4. LAYOUT - MAIN CONTAINERS
   ============================================================================ */

.container {
  display: flex;
  width: 100%;
  background-color: var(--primary-bg);
  overflow: hidden;
  flex-grow: 1;
}


/* ============================================================================
   5. LAYOUT - INPUT & OUTPUT COLUMNS
   ============================================================================ */

.input-column, .output-column {
  width: 50%;
  height: 100%;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  position: relative;
  min-height: 0;
  overflow: hidden;
}

.input-column {
  border-right: 1px solid var(--border-primary);
}

/* Column Headers */
.column-header {
  height: auto;
  min-height: 75px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  box-sizing: border-box;
  border-bottom: 1px solid var(--border-primary);
  flex-shrink: 0;
  position: relative;
}

.column-header h2 {
    display: flex;
    align-items: center;
    cursor: default;
}

/* Loading Spinners */
#loadingSpinner {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
  }
  
  #mobileLoadingSpinner {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

#sequenceLoadingMessage {
    font-size: 0.9em;
    margin-top: 5px;
    text-align: center;
    width: 100%;
    position: absolute;
    bottom: -25px;
}


/* ============================================================================
   6. LAYOUT - CANVAS & MEDIA ELEMENTS
   ============================================================================ */

/* Input Area */
.input-area {
  width: 100%;
  height: calc(100% - 100px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex-grow: 1;
  position: relative;
  min-height: 0;
  overflow: hidden;
}

.input-area input[type="file"] {
  display: none;
}

/* Canvas Elements */
.imageCanvas, #inputVideo {
  width: 100%;
  max-width: 100%;
  object-fit: contain;
  flex-grow: 1;
  border: none;
  min-height: 500px;
}

#inputVideo { 
  display: none; 
}

#outputCanvas {
  background-color: var(--primary-bg);
  width: 100%;
  max-width: 100%;
  height: calc(100% - 100px);
  object-fit: contain;
  flex-grow: 1;
  border: none;
  min-height: 500px;
}

/* Sequence Loading Overlay */
#sequenceLoadingOverlay {
    position: absolute;
    top: 100px;
    left: 0;
    width: 100%;
    height: calc(100% - 100px);
    background-color: var(--overlay-dark);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

#sequenceLoadingSpinner svg {
    fill: var(--primary-text);
}

#sequenceLoadingOverlay p {
    margin-top: 15px;
    font-size: 1.2em;
    color: var(--primary-text);
}

#cancelSequenceButton {
    background-color: var(--hover-red);
    color: var(--error-text);
    border: 1px solid var(--error-text);
    padding: 8px 15px;
    font-size: 0.9em;
    cursor: pointer;
    border-radius: 3px;
    margin-top: 20px;
}

#cancelSequenceButton:hover {
    background-color: var(--hover-red-dark);
}


/* ============================================================================
   7. UPLOAD COMPONENTS
   ============================================================================ */

.upload-zone {
  border: 4px dashed var(--border-primary);
  width: 80%;
  height: 80%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s;
}

.upload-zone:hover {
  background-color: var(--accent-dark);
}

.upload-zone i {
  font-size: 3em;
}

.upload-zone span {
  text-align: center;
  margin-top: 10px;
}

.upload-zone.loading .upload-spinner {
  display: inline-block;
  font-size: 3em;
  margin-bottom: 10px;
}

.upload-zone .upload-spinner {
  display: none;
}

.upload-zone.loading i {
  display: none;
}

/* Example Buttons Container */
.example-buttons-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 15px;
  justify-content: center;
  width: 100%;
}

.example-buttons-container .btn-action {
  min-width: 160px;
  justify-content: center;
  padding: 15px;
  font-size: 0.9em;
}

/* Condensed Upload Zone */
.condensed-upload-zone {
  border: 2px dashed var(--border-primary);
  padding: 8px;
  cursor: pointer;
  display: block;
  transition: background-color 0.2s;
  width: 100%;
  overflow: hidden;
}

.condensed-upload-zone:hover { 
  background-color: var(--accent-dark); 
}

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

.condensed-upload-zone label {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 3px;
    width: 100%;
}

.condensed-upload-zone .filename-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 3px;
    width: 100%;
}

.condensed-upload-zone .filename-container span { 
    margin-bottom: 3px; 
    font-size: 0.9em; 
    word-wrap: break-word; 
    word-break: break-word;
    width: 100%;
}


/* ============================================================================
   8. SETTINGS PANEL
   ============================================================================ */

.settings-panel-container {
  width: 100%;
  min-height: 200px;
  height: auto;
  background-color: var(--primary-bg);
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  box-sizing: border-box;
  border-top: 1px solid var(--border-primary);
  flex-shrink: 0;
  overflow-x: hidden;
}

.settings-panel-section-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 1rem;
  overflow-y: auto;
  min-width: 150px;
  font-size: 1em;
}

/* Settings Panel Sections */
.upload-panel-content {
    flex-grow: 0.4; 
    align-items: flex-start;
    border-right: 1px solid var(--border-primary);
    min-width: 180px; 
    width: 100%; 
    box-sizing: border-box; 
    overflow: hidden;
    position: relative;
 }

 .download-panel-content {
    flex-grow: 0.8;
    align-items: flex-start;
    border-left: 1px solid var(--border-primary);
    min-width: 280px;
 }

 .settings-title-section {
    flex-grow: 0.1; 
    flex-shrink: 0; 
    flex-basis: auto;
    align-items: flex-start; 
    justify-content: flex-start; 
    padding-right: 0;
 }

 .settings-image-content {
    flex-grow: 1.5;
    align-items: flex-start;
 }

 .settings-font-content {
    flex-grow: 1;
    align-items: flex-start;
    min-width: 220px;
 }

 .settings-output-content {
    flex-grow: 0.7;
    align-items: flex-start;
    min-width: 160px;
 }

.settings-panel-section-content h2 {
    font-size: 1.3em;
    margin: 0 0 10px 0;
    width: 100%;
    text-align: left;
    box-sizing: border-box;
    cursor: default;
}

.upload-panel-content > h2.initially-hidden {
    display: none;
}

/* Settings Layouts */
.image-settings-layout, .output-settings-layout, .font-settings-layout {
    display: flex;
    justify-content: space-between;
    width: 100%;
    gap: 1rem;
}

.font-settings-layout {
    gap: 1rem;
}

.settings-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}


/* ============================================================================
   9. FORM CONTROLS & INPUTS
   ============================================================================ */

/* Container Styles */
.slider-container, .control-container, .checkbox-container, .reset-button-container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 10px;
    max-width: 180px;
}

/* Checkboxes */
.checkbox-container {
    flex-direction: row;
    align-items: center;
    margin-top: 5px;
}

.checkbox-container input[type="checkbox"] {
    margin-right: 8px; 
    width: 16px; 
    height: 16px; 
    accent-color: var(--primary-text);
    background-color: var(--border-secondary); 
    border: 1px solid var(--border-primary); 
    cursor: pointer;
    -webkit-appearance: none; 
    -moz-appearance: none; 
    appearance: none;
    border-radius: 3px; 
    position: relative;
}

.checkbox-container input[type="checkbox"]:checked {
    background-color: var(--hover-grey); 
    border-color: var(--primary-text);
}

.checkbox-container input[type="checkbox"]:checked::before {
    content: '\2713'; 
    font-size: 12px; 
    color: var(--primary-text);
    position: absolute; 
    left: 2px; 
    top: 0px;
}

.checkbox-container label { 
  font-size: 0.85em; 
  cursor: pointer; 
}

/* Select Dropdowns */
.control-container label { 
  margin-bottom: 5px; 
  font-size: 0.85em; 
  white-space: nowrap; 
}

.control-container select, .select-group select {
    background-color: var(--primary-bg);
    color: var(--primary-text);
    border: 1px solid var(--border-primary);
    padding: 5px;
    width: 100%;
    font-family: inherit;
    height: 28px;
    max-width: 180px;
 }

.select-group select {
    flex-grow: 1;
    margin: 0;
}

/* Text Inputs */
.control-container input[type="text"] {
    background-color: var(--primary-bg);
    color: var(--primary-text);
    border: 1px solid var(--border-primary);
    padding: 5px;
    width: 100%;
    font-family: inherit;
    margin-top: 3px;
    height: 28px;
}

.control-container input[type="text"]:disabled {
    background-color: var(--dark-grey);
    color: var(--muted-grey);
    cursor: not-allowed;
}

#customCharsHelpButton:disabled {
    background-color: var(--dark-grey);
    color: var(--muted-grey);
    cursor: not-allowed;
    border-color: var(--dark-grey);
}

/* Input Groups */
.input-group, .select-group {
    display: flex; 
    align-items: center; 
    width: 100%; 
    max-width: 180px;
}

.select-group {
    gap: 0px;
}

.input-group button, .select-group button {
    padding: 5px 8px;
    font-size: 1em;
    height: 28px;
    flex-shrink: 0;
    margin: 0;
}

.input-group input[type="number"] {
    width: 50px;
    text-align: center;
    background-color: var(--primary-bg);
    color: var(--primary-text);
    border: 1px solid var(--border-primary);
    padding: 3px;
    height: 28px;
    -moz-appearance: textfield;
    appearance: textfield;
    margin: 0 3px;
}

.input-group input[type=number]::-webkit-outer-spin-button,
.input-group input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none; 
    margin: 0;
}

/* Range Sliders */
.slider-container label {
    display: flex; 
    justify-content: space-between; 
    width: 100%;
    margin-bottom: 10px; 
    font-size: 0.85em; 
    white-space: nowrap;
}

.slider-container label span { 
  margin-left: 5px; 
  color: var(--primary-text); 
}
  
#gridSizeDisplay, #outputResolutionDisplay {
  display: inline-block;
  margin-top: 5px;
}

input[type="range"] {
    -webkit-appearance: none; 
    appearance: none; 
    width: 100%;
    height: 8px; 
    background: var(--border-secondary); 
    outline: none; 
    opacity: 0.7;
    transition: opacity .15s ease-in-out; 
    border-radius: 4px;
    touch-action: pan-x;
}

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

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none; 
    appearance: none; 
    width: 16px; 
    height: 16px;
    background: var(--primary-text); 
    cursor: pointer; 
    border-radius: 50%; 
    border: 1px solid var(--primary-bg);
}

input[type="range"]::-moz-range-thumb {
    width: 16px; 
    height: 16px; 
    background: var(--primary-text); 
    cursor: pointer;
    border-radius: 50%; 
    border: 1px solid var(--primary-bg);
}


/* ============================================================================
   10. BUTTONS
   ============================================================================ */

/* Base Button Styles */
.btn-base {
    background-color: var(--primary-bg);
    color: var(--primary-text);
    border: 1px solid var(--primary-text);
    cursor: pointer;
    transition: background-color 0.2s;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
}

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

.btn-base:disabled {
    color: var(--muted-grey);
    border-color: var(--muted-grey);
    cursor: not-allowed;
    background-color: var(--dark-grey);
    transform: none !important;
}

/* Button Variants */
.btn-action {
    padding: 6px 10px;
    font-size: 0.85em;
    justify-content: flex-start;
    padding-left: 10px;
    margin-bottom: 0;
}

.btn-action i { 
    margin-right: 8px; 
    font-size: 1.1em; 
    line-height: 1;
    display: inline-block;
}

.change-image-button {
    padding: 4px 7px;
    justify-content: center;
    font-size: 0.8em;
    align-self: flex-start;
    margin-top: 5px;
    width: 100%;
    max-width: 140px;
}

.download-button {
    width: 100%;
}

.download-buttons-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    width: 100%;
}

.reset-button-container {
    width: 100%; 
    margin-top: 10px; 
    display: flex; 
    justify-content: flex-start;
}

.reset-button {
    background-color: var(--disabled-red);
    color: var(--error-text);
    border: 1px solid var(--error-text);
    padding: 6px 10px;
    width: auto;
    min-width: 160px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.reset-button:hover { 
  background-color: var(--hover-red); 
}


/* ============================================================================
   11. MODALS
   ============================================================================ */

/* Info Modal */
.info-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-bg);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    box-sizing: border-box;
}

.info-modal-content {
    background-color: var(--primary-bg);
    border: 2px solid var(--primary-text);
    max-width: 600px;
    max-height: 90vh;
    width: 100%;
    overflow-y: auto;
    color: var(--primary-text);
    font-family: "Courier New", Courier, monospace;
}

.info-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px 10px 25px;
    border-bottom: 1px solid var(--border-primary);
}

.info-modal-header h2 {
    margin: 0;
    color: var(--primary-text);
    font-size: 1.5em;
}

.info-modal-close {
    background: none;
    border: none;
    color: var(--primary-text);
    font-size: 2em;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.info-modal-close:hover {
    color: var(--error-text);
}

.info-modal-body {
    padding: 0px 25px 25px 25px;
    line-height: 1.4;
}

.info-modal-body h3 {
    color: var(--primary-text);
    margin: 20px 0 0 0;
    font-size: 1.2em;
}

.info-modal-body ul, .info-modal-body ol {
    margin: 10px 0;
    padding-left: 25px;
}

.info-modal-body p {
    margin: 15px 0;
}

.info-modal-body strong {
    color: var(--primary-text);
    font-weight: bold;
}

.info-modal-footer {
    padding-top: 20px;
    border-top: 1px solid var(--border-primary);
    display: flex;
    justify-content: center;
}

/* FPS Selection Modal */
.fps-options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    margin: 20px 0px 20px 0px;
}

.fps-option-button {
    background-color: var(--primary-bg);
    color: var(--primary-text);
    border: 2px solid var(--border-primary);
    padding: 12px 15px;
    cursor: pointer;
    font-family: inherit;
    text-align: left;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    min-height: 60px;
}

.fps-option-button:hover {
    background-color: var(--hover-grey);
    border-color: var(--primary-text);
    transform: translateY(-1px);
}

.fps-number {
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--primary-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.fps-description {
    align-self: flex-end;
}

/* Video Metadata Display */
.video-metadata {
    background-color: var(--accent-dark);
    border: 1px solid var(--border-primary);
    padding: 5px 15px 5px 15px;
    font-family: inherit;
}

.video-metadata h3 {
    margin: 0 0 10px 0;
    color: var(--primary-text);
    font-size: 1.1em;
}

.metadata-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.9em;
}

.metadata-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
}

.metadata-label {
    color: var(--primary-text);
    font-weight: normal;
}

.metadata-value {
    color: var(--primary-text);
    font-weight: bold;
    text-align: right;
}


/* ============================================================================
   12. MOBILE COMPONENTS
   ============================================================================ */

.mobile-panel {
    display: none; 
    width: 100%; 
    flex-direction: column; 
    align-items: center;
    padding: 10px; 
    box-sizing: border-box; 
    background-color: var(--primary-bg);
}

#mobileUploadPanelPlaceholder { 
  align-items: center; 
}

#mobileDownloadPanelPlaceholder { 
  border-top: 1px solid var(--border-primary); 
  align-items: flex-start; 
}

#mobileSettingsPanel { 
  border-bottom: 1px solid var(--border-primary); 
  border-top: 1px solid var(--border-primary); 
}


/* ============================================================================
   13. BRANDING
   ============================================================================ */

.glyphtrix-logo {
    font-family: "Courier New", Courier, monospace;
    font-weight: bold;
    font-size: 1.2em;
    color: var(--primary-text);
    text-align: center;
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    letter-spacing: 0.1em;
    opacity: 0.8;
    cursor: pointer;
    transition: opacity 0.3s ease;
    user-select: none;
}

.glyphtrix-logo:hover {
    opacity: 1;
}

.glyphtrix-logo.scrambling {
    animation: scramble 0.6s ease-in-out;
}

@keyframes scramble {
    0%, 100% { opacity: 0.8; }
    25% { opacity: 1; }
    50% { opacity: 0.9; }
    75% { opacity: 1; }
}


/* ============================================================================
   14. RESPONSIVE DESIGN - TABLET (769px - 1600px)
   ============================================================================ */

@media (min-width: 769px) and (max-width: 1600px) {
  body {
    flex-direction: row;
  }
  
  .container {
    flex-direction: column;
    margin-left: 400px;
    width: calc(100% - 400px);
    height: 100vh;
    display: flex;
  }
  
  .input-column, .output-column {
    width: 100%;
    height: 50vh;
    border-right: none;
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    flex-direction: column;
  }
  
  .output-column {
    border-bottom: none;
  }
  
  .column-header {
    height: 75px;
    min-height: 75px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .input-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    height: calc(100% - 75px);
  }
  
  .imageCanvas, #inputVideo, #outputCanvas {
    flex: 1;
    min-height: 200px;
    max-height: none;
  }
  
  .settings-panel-container {
    position: fixed;
    left: 0;
    top: 0;
    width: 400px;
    height: 100vh;
    flex-direction: column;
    overflow-y: auto;
    border-right: 2px solid var(--border-primary);
    z-index: 100;
    background-color: var(--primary-bg);
  }
  
  .settings-panel-section-content {
    flex: none;
    min-height: auto;
    border-right: none;
    border-left: none;
    border-bottom: 1px solid var(--border-primary);
    padding: 15px;
  }
  
  .settings-title-section {
    border-bottom: none;
  }

  
  .upload-panel-content,
  .download-panel-content {
    border-right: none;
    border-left: none;
  }


  .glyphtrix-logo {
    position: static;
    transform: none;
    text-align: center;
    align-self: center;
    width: 100%;
  }
  
  .image-settings-layout,
  .font-settings-layout,
  .output-settings-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
  }
  
  .settings-column {
    margin-bottom: 0;
  }
  
  .mobile-panel {
    display: none;
  }
  
  .mobile-preview-panel,
  .sticky-spacer {
    display: none !important;
  }
}


/* ============================================================================
   15. RESPONSIVE DESIGN - MOBILE (max 768px)
   ============================================================================ */

@media (max-width: 768px) {
  /* Base Mobile Styles */
  html, body { 
      height: auto;
      overflow-x: hidden;
      overflow-y: auto;
  }

  body { 
      justify-content: flex-start; 
  }

  .container { 
      flex-direction: column; 
      height: auto !important;
      min-height: auto;
  }

  /* Layout Adjustments */
  .settings-panel-container { 
    display: none !important; 
  }

  .mobile-panel { 
    display: flex; 
  }

  .mobile-panel .settings-panel-section-content h2 { 
    display: block; 
    text-align: left; 
  }

  .upload-panel-content, .download-panel-content { 
    border-right: none !important; 
    border-left: none !important; 
  }

  .settings-panel-section-content > .control-group,
  .settings-panel-section-content > .condensed-upload-zone,
  .settings-panel-section-content > .download-buttons-grid,
  .settings-panel-section-content > .image-settings-layout,
  .settings-panel-section-content > .output-settings-layout,
  .settings-panel-section-content > .font-settings-layout,
  .settings-panel-section-content > .checkbox-container {
      margin-left: 0; 
      width: 100%;
  }

  .image-settings-layout, .output-settings-layout, .font-settings-layout { 
    flex-direction: column; 
    gap: 0; 
  }

  .settings-column { 
    margin-bottom: 10px; 
    width: 100%;
  }

  /* Hide preview toggle on mobile */
  #previewChangesContainer {
      display: none !important;
  }

  /* Column Headers */
  .column-header { 
    height: 50px; 
    border-top: 1px solid var(--border-primary); 
  }

  .input-column, .output-column { 
      width: 100%; 
      height: auto;
      border-right: none; 
      display: flex;
      flex-direction: column;
  }

  .input-area { 
      display: flex; 
      padding: 10px;
      box-sizing: border-box;
      height: auto;
      overflow: visible;
      flex-grow: 0;
      min-height: 0;
      justify-content: flex-start;
      align-items: flex-start;
  }

  #outputCanvas { 
      width: 100%; 
      height: auto;
      max-width: 100%;
      object-fit: contain;
      flex-grow: 0;
      min-height: 0;
      transition: all 0.3s ease;
  }
  

  /* Mobile Preview Panel */
  .mobile-preview-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 400px;
      z-index: 50;
      background-color: var(--primary-bg);
      display: none;
  }
  
  .mobile-preview-panel.active {
      display: flex;
      flex-direction: column;
  }
  
  .mobile-preview-header {
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-bottom: 1px solid var(--border-primary);
      background-color: var(--primary-bg);
      position: relative;
  }
  
  .mobile-preview-toggle {
      display: flex;
      gap: 30px;
      align-items: center;
  }
  
  .mobile-toggle-option {
      font-size: 1.1em;
      font-weight: bold;
      cursor: pointer;
      padding: 8px 12px;
      transition: all 0.3s ease;
      color: var(--muted-grey);
      text-decoration: none;
      border-bottom: 2px solid transparent;
  }
  
  .mobile-toggle-option.active {
      color: var(--primary-text);
      border-bottom-color: var(--primary-text);
  }
  
  .mobile-toggle-option:hover {
      color: var(--primary-text);
  }
  
  .mobile-preview-content {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      position: relative;
      border-bottom: 1px solid var(--border-primary);
  }
  
  .mobile-preview-content canvas,
  .mobile-preview-content video,
  .mobile-preview-content .upload-zone {
      max-width: 100%;
      max-height: 350px;
      object-fit: contain;
  }
  
  .mobile-preview-content .upload-zone {
      width: 80%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      border: 4px dashed var(--border-primary);
      cursor: pointer;
      transition: background-color 0.2s;
  }
  
  .mobile-preview-content .upload-zone:hover {
      background-color: var(--hover-grey);
  }
  
  .upload-zone,
  .mobile-preview-content .upload-zone,
  .condensed-upload-zone {
      border: none !important;
      background-color: transparent !important;
      cursor: default !important;
  }

  .upload-zone:hover,
  .mobile-preview-content .upload-zone:hover,
  .condensed-upload-zone:hover {
      background-color: transparent !important;
  }

  /* Sticky Spacer */
  .sticky-spacer {
      height: 400px;
      display: none;
  }
  
  .sticky-spacer.active {
      display: block;
      flex-shrink: 0;
  }
  

  /* Canvas Elements */
  .imageCanvas, #inputVideo {
      width: 100%;
      height: auto;
      max-width: 100%;
      object-fit: contain;
      flex-grow: 0;
      min-height: 0;
  }

  .settings-panel-section-content {
        margin-bottom: 10px; 
        width: 100%; 
        padding: 0 5px; 
        overflow-y: visible; 
        align-items: flex-start;
  }

  .settings-image-content .slider-container,
  .settings-image-content .checkbox-container,
  .settings-font-content .control-container,
  .settings-output-content .control-container { 
    align-items: center; 
  }

  .control-container.control-group { 
    align-items: flex-start; 
  }

  .upload-panel-content, .download-panel-content { 
    align-items: flex-start; 
  }

  /* Disable tapping the slider track to allow scrolling */
  input[type="range"] { 
    pointer-events: none; 
  }

  input[type="range"]::-webkit-slider-thumb { 
    pointer-events: auto; 
  }

  input[type="range"]::-moz-range-thumb { 
    pointer-events: auto; 
  }

  input[type="range"]::-ms-thumb { 
    pointer-events: auto; 
  }

  /* Logo Adjustments */
  .glyphtrix-logo {
    position: static;
    transform: none;
    margin-bottom: 10px;
    padding-bottom: 10px;
    font-size: 1.1em;
    text-align: center;
    align-self: center;
    width: 100%;
  }

  .download-buttons-grid { 
    grid-template-columns: 1fr; 
  }

  .change-image-button, .download-button, .reset-button { 
    width: 100%; 
    max-width: none; 
    margin-bottom: 5px; 
    box-sizing: border-box;
  }
  

  /* Upload Zone Adjustments */
  .condensed-upload-zone {
    width: 100%;
    max-width: none;
    display: block;
    min-height: auto;
    padding: 10px;
  }
  
  .condensed-upload-zone label {
    display: flex;
    flex-direction: column;
    width: 100%;
    min-height: auto;
  }
  
  .condensed-upload-zone .filename-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    min-height: auto;
  }
  
  .condensed-upload-zone .filename-container span {
    white-space: normal;
    line-height: 1.3;
    margin-bottom: 8px;
    display: block;
    width: 100%;
  }
  
  .upload-panel-content {
    padding: 10px !important;
    width: 100%;
    overflow: visible;
  }
  

  /* Form Control Sizing */
  .slider-container, .control-container, .checkbox-container, .reset-button-container {
    max-width: none;
    width: 100%;
    margin-bottom: 25px;
  }
  
  .control-container select, .select-group select {
    max-width: none;
    width: 100%;
  }

  /* Mobile control sizing: slightly reduced dropdown/button size, larger touch targets overall */
  .control-container select, .select-group select {
    height: 40px;
    padding: 8px 10px;
    font-size: 1em;
  }

  .select-group button {
    min-width: 40px;
    min-height: 40px;
    padding: 8px 10px;
    font-size: 1.05em;
  }

  .input-group input[type="number"] {
    height: 40px;
    padding: 6px 8px;
    font-size: 1em;
  }

  .checkbox-container input[type="checkbox"] {
    width: 20px; 
    height: 20px;
  }

  .checkbox-container label {
    font-size: 1em;
  }

  .btn-base,
  .btn-action,
  .change-image-button,
  .download-button,
  .reset-button {
    min-height: 44px;
    padding: 10px 12px;
    font-size: 1em;
  }

  .control-container label {
    font-size: 1em;
    margin-bottom: 0.8rem;
  }

  .control-container input[type="text"] {
    height: 40px;
    padding: 8px 10px;
    font-size: 1em;
    width: 100%;
    box-sizing: border-box;
  }

  #customTextColor,
  #customBackgroundColor {
    width: 44px !important;
    height: 36px !important;
  }

  #customColorsRandomizeButton {
    font-size: 1.3em;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 4px;
  }

  
  .input-group, .select-group {
    max-width: none;
    width: 100%;
  }
  
  .slider-container input[type="range"], .input-group input[type="number"], .select-group select {
      width: 100%;
      max-width: none;
  }

  /* Mobile touch targets for sliders */
  input[type="range"]::-webkit-slider-runnable-track { 
    height: 8px; 
  }

  input[type="range"]::-moz-range-track { 
    height: 8px; 
  }

  input[type="range"]::-ms-track { 
    height: 8px; 
  }

  input[type="range"]::-webkit-slider-thumb {
      width: 20px; 
      height: 20px;
  }

  input[type="range"]::-moz-range-thumb {
      width: 20px; 
      height: 20px;
  }

  .slider-container {
      padding: 8px 0;
  }


  /* Modal Adjustments */
  .info-modal {
      padding: 10px;
  }

  .info-modal-content {
      max-height: 90vh;
  }

  .info-modal-header, .info-modal-body {
      padding: 15px 20px;
  }
}


/* ============================================================================
   16. RESPONSIVE DESIGN - LARGE SCREENS
   ============================================================================ */

/* Settings Panel Adjustments for Screens up to 2000px */
@media (max-width: 2000px) {
  .font-settings-layout, .output-settings-layout {
    flex-direction: column !important;
    gap: 0 !important;
  }

  .font-settings-layout .settings-column, .output-settings-layout .settings-column {
    margin-bottom: 10px;
    width: 100%;
  }

  .settings-panel-container {
    min-height: 280px;
  }
}

/* Short Screen Adjustments */
@media (max-height: 800px) and (min-width: 1601px) {
  .imageCanvas, #inputVideo {
    min-height: 300px !important;
    max-height: calc(100vh - 350px) !important;
  }

  #outputCanvas {
    min-height: 300px !important;
    max-height: calc(100vh - 350px) !important;
  }

  .settings-panel-container {
    min-height: 200px !important;
    max-height: 250px;
    overflow-y: auto;
  }

  .input-area {
    min-height: 250px;
  }
}

/* Extra Large Screens */
@media (min-width: 1601px) {
  .mobile-preview-panel,
  .sticky-spacer {
    display: none !important;
  }
  
  .settings-title-section {
    position: relative;
  }
  
  .settings-title-section > div {
    flex-direction: column !important;
    align-items: flex-start !important;
  }
  
  .settings-title-section > div > div {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
  }
}


/* ============================================================================
   17. ANIMATIONS
   ============================================================================ */

#glyphRandomizeButton.dice-animate, #customColorsRandomizeButton.dice-animate {
  animation: dice-rotate 0.25s cubic-bezier(0.6, 0.1, 0.4, 1);
}

@keyframes dice-rotate {
  0% { transform: rotate(0deg); }
  30% { transform: rotate(-40deg); }
  60% { transform: rotate(20deg); }
  80% { transform: rotate(-10deg); }
  100% { transform: rotate(0deg); }
}