/* CSS Custom Properties (Variables) */
:root {
  /* Colors */
  --primary-color: #007bff;
  --primary-hover: #0056b3;
  --primary-light: rgba(0, 123, 255, 0.1);
  --primary-lighter: rgba(0, 123, 255, 0.2);
  --text-color: black;
  --text-muted: #999;
  --text-error: #ff6b6b;
  --background-primary: white;
  --background-secondary: #f5f5f5;
  --background-dark: #2a1a1a;
  --border-color: #ddd;
  --border-primary: #007bff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --shadow-strong: rgba(0, 0, 0, 0.15);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 4rem;
  
  /* Borders and Radii */
  --border-width: 2px;
  --border-radius: 0.5rem;
  --border-radius-sm: 0.25rem;
  --border-radius-lg: 8px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-cubic: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Typography */
  --font-family: Helvetica, Arial, sans-serif;
  --font-size-base: 14px;
  --line-height-base: 1.6em;
  
  /* Layout */
  --content-width-mobile: 95%;
  --content-width-tablet: 92%;
  --content-width-desktop: 90%;
  --max-width-content: 100em;
  --max-width-heading: 66.67em;
  
  /* Interactive elements */
  --min-touch-target: 44px;
  --dropdown-max-height: 200px;
  --tooltip-max-width: 90vw;
  --modal-max-width: 95vw;
  --modal-max-height: 95vh;
}

/* Dark mode color overrides */
@media (prefers-color-scheme: dark) {
  :root {
    --text-color: #e0e0e0;
    --background-primary: #2a2a2a;
    --background-secondary: #333;
    --background-dark: #1a1a1a;
    --border-color: #444;
    --shadow-color: rgba(0, 0, 0, 0.3);
  }
}

/* Reset and base styles */
* {
  box-sizing: border-box;
}

/* Universal styles */
img {
  max-width: 100%;
  height: auto;
  border: var(--border-width) solid var(--text-color);
}

/* Base styles (mobile-first approach) */
body {
  margin: 0 auto;
  padding: 4px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--text-color);
  max-width: 100%;
  overflow-x: hidden;
  background-color: var(--background-primary);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-family: sans-serif;
  font-weight: normal;
}

a {
  color: var(--primary-color);
  text-decoration: none;
}

.header {
  background-color: var(--background-secondary);
  padding: var(--spacing-md);
  width: 100%;
}

h1 {
  font-size: 24px;
  padding: 16px 8px;
  margin: 0;
  text-align: center;
  font-weight: bold;
}

h2 {
  font-size: 20px;
  margin: 0;
  text-align: center;
}

h3 {
  font-size: 16px;
}

hr {
  margin-top: 0.5em;
  margin-bottom: 1em;
}

.about-list li {
  display: block;
  margin-bottom: 10px;
}

.about-info {
  display: block;
  margin-bottom: 5px;
}

.date {
  display: block;
  text-align: right;
}

/* Interactive SVG Blog Styles - Mobile First */
.svg-selector {
  background: var(--background-secondary);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  margin: var(--spacing-md) auto;
  border: var(--border-width) solid var(--border-color);
  box-shadow: 0 0.25rem 1.25rem var(--shadow-color);
  position: relative;
  overflow: visible;
  width: var(--content-width-mobile);
  max-width: 100%;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.svg-selector .info-panel {
  margin-bottom: 1rem;
  width: 100%;
  order: 1;
}

.info-panel h3 {
  width: auto;
  margin: 0 0 0.75em 0;
  padding: 0;
  text-align: left;
}

.info-panel p {
  width: auto;
  margin: 0 0 1em 0;
  padding: 0;
  text-align: justify;
}

.info-panel p:last-child {
  margin-bottom: 0;
}

.selector-controls {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.75rem;
  margin-bottom: 1rem;
  width: 100%;
  order: 2;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
}

.control-row .search-container {
  width: 400px;
  max-width: 60vw;
}

.selector-controls label {
  display: inline-block;
  text-align: left;
  box-sizing: border-box;
  margin-right: 1rem;
  margin-bottom: 0;
  white-space: nowrap;
  flex-shrink: 0;
  width: 200px;
}

.selector-controls button {
  width: auto;
  text-align: center;
  box-sizing: border-box;
  flex-shrink: 0;
  min-width: 120px;
  padding: 12px 16px;
  font-size: 14px;
  min-height: 44px;
  white-space: nowrap;
  overflow: visible;
  align-self: center;
}

.content-container {
  width: 100%;
  order: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}

.svg-container {
  display: flex;
  justify-content: center;
  width: 100%;
}

.svg-container svg {
  width: 100%;
  height: auto;
  cursor: pointer;
  transition: transform 0.3s ease;
  filter: drop-shadow(0 0.25rem 0.5rem rgba(0, 0, 0, 0.2));
}

/* Search container - Mobile First */
.search-container {
  position: relative;
  flex: 1;
  min-width: 0;
}


.search-container input {
  background: var(--background-primary);
  color: var(--text-color);
  border: var(--border-width) solid var(--border-primary);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-base);
  width: 100%;
  box-sizing: border-box;
  transition: all var(--transition-normal);
  min-height: var(--min-touch-target);
  padding: 12px 40px 12px 16px;
  cursor: text;
}

.search-container::after {
  content: '▼';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: #007bff;
  font-size: 12px;
  pointer-events: none;
  transition: transform 0.3s ease;
}

.search-container.open::after {
  transform: translateY(-50%) rotate(180deg);
}


.search-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--background-primary);
  border: var(--border-width) solid var(--border-primary);
  border-top: none;
  border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
  max-height: var(--dropdown-max-height);
  overflow-y: auto;
  z-index: 9999;
  display: none;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  margin-top: -1px;
  width: 100%;
  box-sizing: border-box;
}

.search-dropdown.show {
  display: block;
}

.dropdown-item {
  padding: 12px 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
  border-bottom: 1px solid var(--border-color);
  min-height: var(--min-touch-target);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.dropdown-item:last-child {
  border-bottom: none;
}

.dropdown-item:hover {
  background: var(--primary-light);
  color: var(--primary-color);
}

.dropdown-item.selected {
  background: var(--primary-lighter);
  color: var(--primary-color);
}

.dropdown-item .item-title {
  font-weight: 600;
  color: var(--primary-color);
}

.dropdown-item .item-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* SVG Selector Elements */
.svg-selector label {
  flex-shrink: 0;
  color: black;
  font-size: 14px;
  margin-bottom: 4px;
}

.svg-selector select {
  background: var(--background-primary);
  color: var(--text-color);
  border: var(--border-width) solid var(--border-primary);
  border-radius: var(--border-radius-lg);
  padding: 12px 16px;
  font-size: var(--font-size-base);
  width: 100%;
  transition: all var(--transition-normal);
  cursor: pointer;
  min-height: var(--min-touch-target);
  box-sizing: border-box;
}

.svg-selector button {
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--border-radius-lg);
  padding: 12px 20px;
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  flex-shrink: 0;
  white-space: nowrap;
  min-height: var(--min-touch-target);
  width: 100%;
  box-sizing: border-box;
}

.svg-selector button:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
}

.svg-selector button:active:not(:disabled) {
  transform: translateY(0);
}

.svg-selector button:disabled {
  background: #666;
  color: var(--text-muted);
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

/* Tooltip styles */
.tooltip {
  position: absolute;
  background: var(--background-primary);
  color: var(--text-color);
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
  border: var(--border-width) solid var(--border-primary);
  box-shadow: 0 0.25rem 1rem var(--shadow-strong);
  pointer-events: none;
  opacity: 0;
  transform: translateY(0.625rem) scale(0.9);
  transition: all var(--transition-cubic);
  max-width: var(--tooltip-max-width);
  z-index: 1000;
  font-size: 0.8rem;
  backdrop-filter: blur(0.625rem);
  text-align: left;
}

.tooltip.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.tooltip h4 {
  margin: 0 0 0.5rem 0;
  color: var(--primary-color);
  font-size: 0.9rem;
}

.tooltip p {
  margin: 0;
  padding: 0;
  text-align: left;
}

.tooltip p strong {
  color: var(--primary-color);
}

.tooltip ul {
  margin: 0.3125rem 0;
  padding-left: 1rem;
}

.tooltip li {
  text-align: left;
}

/* Modal styles */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(0.125rem);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal.show {
  opacity: 1;
}

.modal-content {
  background: var(--background-primary);
  margin: 2vh auto;
  padding: var(--spacing-md);
  border: var(--border-width) solid var(--border-primary);
  border-radius: var(--border-radius);
  width: var(--content-width-mobile);
  max-width: var(--modal-max-width);
  max-height: var(--modal-max-height);
  min-height: auto;
  overflow-y: auto;
  color: var(--text-color);
  position: relative;
  box-shadow: 0 0.5rem 2rem var(--shadow-strong);
  transform: translateY(2rem) scale(0.9);
  transition: all var(--transition-cubic);
  box-sizing: border-box;
}

/* Mobile modal content layout */
.modal-content-mobile {
  width: 100% !important;
}

.modal-content-mobile .video-container {
  width: 100% !important;
  max-width: 100% !important;
  flex: none !important;
}

.modal-content-mobile video {
  width: 100% !important;
  max-width: 100% !important;
}

.modal.show .modal-content {
  transform: translateY(0) scale(1);
}

.close {
  color: #aaa;
  float: right;
  font-size: 1.5rem;
  cursor: pointer;
  position: absolute;
  right: 1rem;
  top: 0.75rem;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.3s ease;
  font-family: Arial, sans-serif;
  font-weight: normal;
  line-height: 1;
  text-align: center;
  min-height: 44px;
  min-width: 44px;
}

/* Shared close button hover styles */
.close:hover,
#close-image-btn:hover {
  color: var(--primary-color) !important;
  background: var(--primary-light) !important;
  transform: rotate(90deg);
}

/* Consolidated hover effects for interactive elements */
.dropdown-item:hover,
.search-container input:hover,
.svg-selector select:hover {
  border-color: var(--primary-hover);
  transition: all var(--transition-normal);
}

.svg-selector button:hover:not(:disabled),
.node-interactive:hover,
.edge-interactive:hover {
  transition: all var(--transition-normal);
}

/* Consolidated focus styling for form elements */
.search-container input:focus,
.svg-selector select:focus {
  outline: none;
  border-color: var(--border-primary);
  box-shadow: 0 0 0 3px var(--primary-lighter);
}

/* Consolidated spacing for content elements */
h3, p, ul {
  margin: 0 auto;
  text-align: justify;
}

/* Consolidated responsive content widths */
@media (max-width: 480px) {
  h3, p, ul, hr {
    width: var(--content-width-mobile);
    padding: 0 var(--spacing-sm);
  }
}

@media (min-width: 481px) {
  h3, p, ul, hr {
    width: var(--content-width-tablet);
    padding: 0 12px;
  }
}

@media (min-width: 901px) {
  h3, p, ul, hr {
    width: var(--content-width-desktop);
    padding: 0 16px;
  }
  
  h3 {
    max-width: var(--max-width-heading);
  }
  
  p, ul, hr {
    max-width: var(--max-width-content);
  }
}

.modal h3 {
  color: var(--primary-color);
  margin: 1.5rem 0 1rem 0;
  font-size: 1.1rem;
}

.modal p strong {
  color: var(--primary-color);
}

.modal ul {
  padding-left: 1rem;
  margin: 0.75rem 0;
}

.modal li {
  margin: 0.5rem 0;
  line-height: 1.5;
  opacity: 0.9;
}

/* Custom scrollbar for modal */
.modal-content::-webkit-scrollbar {
  width: 0.5rem;
}

.modal-content::-webkit-scrollbar-track {
  background: var(--background-secondary);
  border-radius: var(--border-radius-sm);
}

.modal-content::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: var(--border-radius-sm);
}

.modal-content::-webkit-scrollbar-thumb:hover {
  background: var(--primary-hover);
}

/* Modal content sizing fix - prevents cropping in narrow desktop windows */
#modal-media-container {
  max-width: 100% !important;
  box-sizing: border-box;
  justify-content: center !important;
  align-items: center !important;
}

/* Let JavaScript handle exact sizing, CSS provides overflow protection */
#modal-media-container .video-container,
#modal-media-container #modal-image-container.image-container {
  flex: 0 0 auto !important;
  max-width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Ensure content doesn't exceed modal bounds but allow JavaScript sizing */
#modal-media-container video,
#modal-date-image {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
}

/* Error and loading states */
.error-message {
  color: var(--text-error);
  text-align: left;
  padding: var(--spacing-md);
  background-color: var(--background-dark);
  border-radius: var(--border-radius-sm);
  margin: var(--spacing-md) 0;
  font-size: 0.9rem;
}

.error-message ol {
  color: #ccc;
  margin: var(--spacing-sm) 0;
}

.error-message li {
  margin: var(--spacing-xs) 0;
}

.error-message strong {
  color: var(--primary-color);
}

.loading {
  text-align: center;
  color: var(--primary-color);
  font-size: 1rem;
  margin: var(--spacing-md) 0;
}

/* SVG interaction styles */
.node-interactive {
  cursor: pointer;
  transition: all var(--transition-normal);
}

.node-interactive:hover {
  filter: brightness(1.3);
  stroke: var(--primary-color) !important;
  stroke-width: 3 !important;
}

.edge-interactive {
  cursor: pointer;
}

.edge-interactive:hover {
  opacity: 0.8;
  filter: brightness(1.2);
}

/* Node highlight class - blue color for nodes */
.highlight-node {
  stroke: var(--primary-color) !important;
  stroke-width: 3 !important;
  filter: brightness(1.3) !important;
  transition: all var(--transition-fast) !important;
}

/* Edge highlight class - preserve original color for edges */
.highlight-edge {
  stroke-width: max(4px, var(--original-stroke-width, 4px)) !important;
  opacity: 0.9 !important;
  filter: brightness(1.3) !important;
  transition: all var(--transition-fast) !important;
}

/* Make text elements pass through mouse events to nodes underneath */
svg text,
svg g,
svg use {
  pointer-events: none;
}

/* Small mobile styles (max-width: 480px) */
@media (max-width: 480px) {
  body {
    padding: 2px;
  }

  .selector-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .control-row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .selector-controls label {
    margin-right: 0;
    margin-bottom: 0;
    width: auto;
    text-align: left;
  }

  .selector-controls button {
    width: 100%;
    margin-right: 0;
    min-width: auto;
    flex-shrink: 1;
    align-self: stretch;
  }

  .search-container,
  .control-row .search-container {
    width: 100%;
    max-width: none;
  }

  .search-container input {
    padding-right: 30px;
  }

  .search-container::after {
    right: 8px;
  }

  /* Mobile modal adjustments */
  .modal-content {
    margin: 1vh auto;
    padding: 0.75rem;
    max-height: 98vh;
    width: 98%;
    max-width: 98vw;
  }

  .modal h2 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
  }

  .modal-content video {
    max-height: 50vh;
  }
}

/* Tablet styles (481px - 900px) */
@media (min-width: 481px) {
  body {
    font-size: 15px;
    padding: 8px;
  }

  h1 {
    font-size: 28px;
    padding: 20px 16px;
  }

  h2 {
    font-size: 22px;
  }

  h3 {
    font-size: 18px;
  }

  .header {
    padding: 20px;
  }

  .svg-selector {
    padding: 1.25rem;
    margin: 1.5rem auto;
    width: 90%;
  }

  .tooltip {
    font-size: 0.85rem;
    max-width: 24rem;
    padding: 0.875rem 1.125rem;
  }

  .tooltip h4 {
    font-size: 1rem;
  }

  .modal-content {
    margin: 3vh auto;
    padding: 1.25rem;
    width: 90%;
    max-width: 95vw;
    max-height: 90vh;
  }

  .close {
    font-size: 1.75rem;
    width: 2.25rem;
    height: 2.25rem;
  }

  .selector-controls {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 1rem;
  }

  .control-row {
    gap: 1rem;
  }

  .control-row .search-container {
    width: 350px;
    max-width: 50vw;
  }

  .selector-controls label {
    margin-right: 1rem;
    flex-shrink: 0;
    margin-bottom: 0;
    width: 180px;
  }

  .selector-controls button {
    width: auto;
    max-width: 200px;
    min-width: 120px;
    flex-shrink: 0;
    align-self: center;
  }


  .search-container input {
    width: 100%;
  }
}

/* Desktop styles (901px+) */
@media (min-width: 901px) {
  body {
    font-size: 16px;
    padding: 4px;
  }

  h1 {
    font-size: 48px;
    padding: 32px;
  }

  h2 {
    font-size: 32px;
  }

  h3 {
    font-size: 24px;
  }

  hr {
    margin-bottom: 2em;
  }

  .header {
    padding: 32px;
    max-width: 100em;
  }

  .about-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .about-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
  }

  .date {
    margin-left: 20px;
    text-align: right;
  }

  .svg-selector {
    padding: 2rem;
    margin: 2rem auto;
    width: 80%;
    max-width: 80vw;
    flex-direction: column;
    align-items: stretch;
  }

  .svg-selector .info-panel {
    order: 1;
    margin-bottom: 1.5rem;
    width: 100%;
  }

  .selector-controls {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    order: 2;
    margin-bottom: 1.5rem;
    gap: 1.5rem;
  }

  .control-row {
    gap: 1.5rem;
  }

  .control-row .search-container {
    width: 450px;
    max-width: 55vw;
  }

  .selector-controls label {
    margin-right: 1rem;
    flex-shrink: 0;
    margin-bottom: 0;
    width: 200px;
  }

  .selector-controls button {
    width: auto;
    padding: 12px 20px;
    min-width: 120px;
    flex-shrink: 0;
    align-self: center;
  }

  .content-container {
    order: 3;
    width: 100%;
  }

  .search-container {
    width: 450px;
    flex-shrink: 0;
  }

  .tooltip {
    font-size: 0.875rem;
    max-width: 28rem;
    padding: 1rem 1.125rem;
  }

  .tooltip h4 {
    font-size: 1.1rem;
  }

  .modal-content {
    padding: 2rem;
    width: 90%;
    max-width: 90vw;
    max-height: 80vh;
    min-height: 60vh;
    overflow-x: auto;
  }

  .close {
    font-size: 2rem;
    width: 2.5rem;
    height: 2.5rem;
    right: 1.25rem;
    top: 0.9375rem;
  }

  .modal h3 {
    font-size: 1.3rem;
  }
}

/* Large desktop styles (1200px+) */
@media (min-width: 1200px) {
  .svg-selector {
    width: 70%;
    max-width: 1200px;
  }

  .tooltip {
    max-width: 32rem;
  }

  .modal-content {
    max-width: 90vw;
  }
}

/* Extra large screens (1600px+) */
@media (min-width: 1600px) {
  .svg-selector {
    width: 60%;
    max-width: 1400px;
  }

  .modal-content {
    max-width: 90vw;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .svg-selector {
    border-width: 1px;
  }

  .search-container input,
  .svg-selector select,
  .svg-selector button {
    border-width: 1px;
  }
}

/* Landscape orientation on mobile devices */
@media (max-width: 900px) and (orientation: landscape) {
  .modal-content {
    margin: 2vh auto;
    max-height: 90vh;
  }

  .svg-selector {
    margin: 1rem auto;
  }
}

/* Print styles */
@media print {
  .svg-selector button,
  .search-container,
  .tooltip,
  .modal {
    display: none !important;
  }

  .svg-selector {
    border: 1px solid #000;
    box-shadow: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.4;
  }
}

/* Footer styles */
footer {
  color: var(--text-color);
  text-align: center;
  padding: 1em 0;
}

footer a {
  color: var(--primary-color);
  text-decoration: underline;
}
/* End Footer Styles */

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

/* Dark mode support - Additional overrides beyond CSS variables */
@media (prefers-color-scheme: dark) {
  body {
    background-color: var(--background-dark);
  }

  .selector-controls label {
    color: var(--text-color);
  }

  .dropdown-item:hover {
    background: var(--primary-lighter);
  }

  footer a {
    color: #58a6ff;
  }
}