/**
 * Responsive Design Styles for Stack & Queue Visualizer
 * Mobile-first approach with progressive enhancement
 */

/* Extra Small Devices (phones, less than 576px) */
@media (max-width: 575.98px) {
  /* Typography adjustments */
  .hero-title {
    font-size: var(--font-size-2xl);
    line-height: 1.3;
  }
  
  .hero-description {
    font-size: var(--font-size-base);
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  /* Layout adjustments */
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .hero {
    padding: var(--spacing-2xl) 0;
  }
  
  /* Header modifications */
  .header-content {
    padding: var(--spacing-md) 0;
  }
  
  .logo h1 {
    font-size: var(--font-size-lg);
  }
  
  .logo i {
    font-size: var(--font-size-xl);
  }
  
  /* Navigation - Mobile menu */
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--scheme-neutral-900);
    flex-direction: column;
    padding: var(--spacing-lg) 0;
    z-index: var(--z-dropdown);
  }
  
  .nav.active {
    display: flex;
  }
  
  .nav-link {
    padding: var(--spacing-md) var(--spacing-lg);
    width: 100%;
    text-align: center;
    border-bottom: 1px solid var(--scheme-neutral-1000);
  }
  
  .nav-link:last-child {
    border-bottom: none;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  /* Section adjustments */
  .section-header {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
  }
  
  .section-icon {
    width: 60px;
    height: 60px;
    font-size: var(--font-size-xl);
  }
  
  /* Content grid - stack vertically */
  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  /* Cards */
  .theory-card,
  .demo-card,
  .applications-card,
  .example-card {
    padding: var(--spacing-lg);
  }
  
  /* Controls */
  .input-group {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .button-group {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .btn {
    justify-content: center;
    width: 100%;
  }
  
  /* Visualization containers */
  .visualization-container {
    padding: var(--spacing-lg);
    min-height: 200px;
  }
  
  .stack-visualization {
    min-height: 150px;
  }
  
  .queue-visualization {
    min-height: 80px;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .queue-item {
    min-width: 60px;
    padding: var(--spacing-md);
    font-size: var(--font-size-sm);
  }
  
  .stack-item {
    min-width: 100px;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
  }
  
  /* Pointers and labels */
  .stack-pointer {
    right: -35px;
    font-size: var(--font-size-xs);
  }
  
  .queue-labels {
    font-size: var(--font-size-xs);
    margin-bottom: var(--spacing-sm);
  }
  
  /* Status panel */
  .status-panel {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .status-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
  }
  
  /* Applications grid */
  .applications-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .application-item {
    padding: var(--spacing-lg);
  }
  
  /* Examples grid */
  .examples-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  /* Hero stats */
  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
  }
  
  /* Footer */
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
  }
  
  .footer-links {
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
  }
  
  /* Toast adjustments */
  .toast {
    top: var(--spacing-md);
    right: var(--spacing-md);
    left: var(--spacing-md);
    max-width: none;
  }
  
  /* Text editor */
  #textEditor {
    min-height: 150px;
  }
  
  .editor-controls {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .editor-controls .btn {
    width: 100%;
  }
}

/* Small Devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
  .container {
    max-width: 540px;
  }
  
  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .applications-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .examples-grid {
    grid-template-columns: 1fr;
  }
  
  .button-group {
    flex-direction: row;
    flex-wrap: wrap;
  }
  
  .hero-stats {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-lg);
  }
  
  .status-panel {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .queue-item {
    min-width: 70px;
  }
  
  .stack-item {
    min-width: 110px;
  }
}

/* Medium Devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
  .container {
    max-width: 720px;
  }
  
  .nav {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: none;
  }
  
  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
  
  .applications-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .examples-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .section-header {
    flex-direction: row;
    text-align: left;
  }
  
  .hero-stats {
    flex-direction: row;
    gap: var(--spacing-2xl);
  }
  
  .footer-content {
    flex-direction: row;
  }
  
  .button-group {
    flex-wrap: wrap;
  }
  
  .input-group {
    flex-direction: row;
  }
  
  .status-panel {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Large Devices (desktops, 992px and up) */
@media (min-width: 992px) and (max-width: 1199.98px) {
  .container {
    max-width: 960px;
  }
  
  .content-grid {
    grid-template-columns: 1fr 2fr;
  }
  
  .applications-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .examples-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .status-panel {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Extra Large Devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
  .container {
    max-width: 1140px;
  }
  
  .examples-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .applications-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Ultra Wide Screens (1400px and up) */
@media (min-width: 1400px) {
  .container {
    max-width: 1320px;
  }
  
  .hero-content {
    max-width: 900px;
  }
  
  .section-header {
    margin-bottom: var(--spacing-3xl);
  }
}

/* Landscape Orientation Adjustments */
@media (orientation: landscape) and (max-height: 500px) {
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .visualization-container {
    min-height: 200px;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
}

/* Print Optimizations */
@media print {
  .container {
    max-width: none;
    padding: 0;
  }
  
  .content-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .section {
    padding: var(--spacing-lg) 0;
    page-break-inside: avoid;
  }
  
  .theory-card,
  .demo-card,
  .applications-card,
  .example-card {
    page-break-inside: avoid;
    margin-bottom: var(--spacing-lg);
  }
  
  .applications-grid,
  .examples-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
  
  .application-item,
  .example-card {
    page-break-inside: avoid;
  }
}

/* High DPI/Retina Display Adjustments */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .logo i,
  .section-icon i {
    image-rendering: -webkit-optimize-contrast;
  }
  
  .btn {
    border: 0.5px solid transparent;
  }
  
  .visualization-container {
    border-width: 1px;
  }
}

/* Touch Device Optimizations */
@media (pointer: coarse) {
  .btn {
    min-height: 44px;
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .nav-link {
    min-height: 44px;
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  input,
  textarea {
    min-height: 44px;
  }
  
  .stack-item,
  .queue-item {
    min-height: 44px;
    touch-action: none;
  }
  
  .mobile-menu-btn {
    min-width: 44px;
    min-height: 44px;
  }
}

/* Hover Support Detection */
@media (hover: none) {
  .btn:hover,
  .nav-link:hover,
  .stack-item:hover,
  .queue-item:hover,
  .theory-card:hover,
  .demo-card:hover,
  .applications-card:hover,
  .example-card:hover,
  .application-item:hover {
    transform: none;
    box-shadow: initial;
  }
  
  .nav-link::after {
    display: none;
  }
}

/* Reduced Data Usage */
@media (prefers-reduced-data: reduce) {
  .header {
    backdrop-filter: none;
    background: rgba(255, 255, 255, 0.95);
  }
  
  .theory-card,
  .demo-card,
  .applications-card,
  .example-card {
    backdrop-filter: none;
    background: rgba(255, 255, 255, 0.9);
  }
  
  .nav {
    backdrop-filter: none;
  }
  
  .toast {
    backdrop-filter: none;
  }
}

/* Dark Mode Preferences (Future Enhancement) */
@media (prefers-color-scheme: dark) {
  /* Placeholder for dark mode styles when implemented */
  .visualization-container {
    background: rgba(0, 0, 0, 0.05);
  }
}

/* Container Query Support (Future Enhancement) */
@supports (container-type: inline-size) {
  .demo-card {
    container-type: inline-size;
  }
  
  @container (max-width: 400px) {
    .controls {
      flex-direction: column;
    }
    
    .button-group {
      flex-direction: column;
    }
  }
}

/* Flexible Grid System */
.grid-auto-fit {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.grid-auto-fill {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

/* Responsive Utilities */
.d-none-xs { display: none; }
.d-block-xs { display: block; }
.d-flex-xs { display: flex; }

@media (min-width: 576px) {
  .d-none-sm { display: none; }
  .d-block-sm { display: block; }
  .d-flex-sm { display: flex; }
}

@media (min-width: 768px) {
  .d-none-md { display: none; }
  .d-block-md { display: block; }
  .d-flex-md { display: flex; }
}

@media (min-width: 992px) {
  .d-none-lg { display: none; }
  .d-block-lg { display: block; }
  .d-flex-lg { display: flex; }
}

@media (min-width: 1200px) {
  .d-none-xl { display: none; }
  .d-block-xl { display: block; }
  .d-flex-xl { display: flex; }
}

/* Text Alignment Responsive Utilities */
.text-center-xs { text-align: center; }
.text-left-xs { text-align: left; }
.text-right-xs { text-align: right; }

@media (min-width: 576px) {
  .text-center-sm { text-align: center; }
  .text-left-sm { text-align: left; }
  .text-right-sm { text-align: right; }
}

@media (min-width: 768px) {
  .text-center-md { text-align: center; }
  .text-left-md { text-align: left; }
  .text-right-md { text-align: right; }
}

/* Margin/Padding Responsive Utilities */
@media (max-width: 767.98px) {
  .p-sm-0 { padding: 0; }
  .px-sm-0 { padding-left: 0; padding-right: 0; }
  .py-sm-0 { padding-top: 0; padding-bottom: 0; }
  .m-sm-0 { margin: 0; }
  .mx-sm-0 { margin-left: 0; margin-right: 0; }
  .my-sm-0 { margin-top: 0; margin-bottom: 0; }
}

/* Overflow Handling for Small Screens */
@media (max-width: 575.98px) {
  .visualization-container {
    overflow-x: auto;
    overflow-y: visible;
  }
  
  .queue-visualization {
    min-width: 300px;
  }
  
  .stack-visualization {
    overflow: visible;
  }
}