/*
 * Base styles for the manufacturing cascade visualisation.
 *
 * Colors, spacing, typography and responsive behaviour are defined here.
 * When customising the look and feel, adjust variables at the top of the
 * stylesheet rather than duplicating values throughout.
 */

/* Color variables for easy theming.  Colors map to the same categories
 * defined in `data.js` so that the legend and nodes remain consistent. */
:root {
  --color-root: #c0392b;
  --color-primary: #e74c3c;
  --color-secondary: #f39c12;
  --color-tertiary: #3498db;
  --color-advanced: #9b59b6;
  --color-very-advanced: #8e44ad;
  --color-eighth: #1abc9c;
  --color-ninth: #16a085;
  --color-emergent: #d5d2d8;

  --text-color: #000000;
  --muted-color: #7f8c8d;
  --background: #f5f5f5;
  --panel-background: #ffffff;
  --panel-border: #dddddd;
  --accent: #3498db;
  --accent-hover: #2f8ac4;
  --accent-active: #266d9a;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background-color: var(--background);
  color: var(--text-color);
  line-height: 1.5;
  padding: 16px;
}

/* Container for the entire page.  On wide screens it is centred with a max
 * width to improve readability; on narrow screens it spans the full width. */
#container {
  max-width: 70%;
  margin: 0 auto;
  background-color: var(--panel-background);
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

h1 {
  font-size: 1.8rem;
  text-align: center;
  margin-bottom: 0.25em;
  color: var(--color-root);
}

.subtitle {
  text-align: center;
  color: var(--muted-color);
  margin-bottom: 1em;
}

/* Search bar and control buttons share a container.  Buttons wrap on small
 * screens; spacing is consistent across devices. */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.controls input[type="text"] {
  flex: 2 1 200px;
  padding: 8px 12px;
  font-size: 1rem;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
}

button {
  flex: 1 1 120px;
  padding: 10px 14px;
  background-color: var(--accent);
  color: #ffffff;
  border: none;
  border-radius: 4px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

button:hover {
  background-color: var(--accent-hover);
}

button:active {
  background-color: var(--accent-active);
}

/* Wrapper for the diagram.  Uses a fixed height that adjusts based on
 * viewport height.  Overflow is hidden because zoom and pan will handle
 * navigation. */
#diagramWrapper {
  position: relative;
  width: 100%;
  height: 80vh;
  border: 2px solid var(--panel-border);
  border-radius: 4px;
  overflow: hidden;
  background: #fafafa;
}

svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Legend uses flexbox to organise items; items wrap on small screens. */
.legend {
  margin-top: 4px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
}

.legend-item {
  display: flex;
  align-items: center;
  font-size: 0.85rem;
}

.legend-dot {
  display: inline-block;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  margin-right: 12px;
  border: 2px solid #333;
}

/* Info panel overlays the diagram on small screens and appears as a centered
 * modal on larger screens.  Hidden by default; shown by toggling the
 * .visible class.  The transform property is used to slide the panel in
 * on small screens and to centre and scale it on larger displays. */
.info-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--panel-background);
  border-top: 3px solid var(--accent);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
  padding: 20px;
  transform: translateY(100%);
  transition: transform 0.3s ease;
  z-index: 1000;
  max-height: 80vh;
  overflow-y: auto;
}

/* When the panel is visible on narrow screens, slide it into view from the bottom. */
.info-panel.visible {
  transform: translateY(0);
}

/* On tablets and desktops, center the panel and give it a maximum width.  The
 * transform property includes a scale to hide the panel when not visible, and
 * opacity animates the fade in/out.  Without overriding transform in the
 * visible state, the translate used for centering would be lost due to the
 * more general .info-panel.visible rule defined earlier. */
@media (min-width: 768px) {
  .info-panel {
    left: 50%;
    top: 50%;
    right: auto;
    bottom: auto;
    max-width: 80%;
    border-radius: 8px;
    /* Start slightly scaled down and invisible */
    transform: translate(-50%, -50%) scale(0.8);
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
  }
  .info-panel.visible {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

.panel-header {
  margin-bottom: 12px;
  border-bottom: 1px solid var(--panel-border);
  padding-bottom: 8px;
  position: relative;
}

.panel-title {
  font-size: 1.0rem;
  font-weight: 600;
  margin: 0;
}

.close-btn {
  position: absolute;
  top: 0;
  right: 0;
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  color: #e74c3c;
  padding: 4px;
}

.close-btn:hover {
  color: #c0392b;
}

.info-section {
  margin: 12px 0;
  padding: 12px;
  background: #f8f9fa;
  border-radius: 4px;
  border: 1px solid var(--panel-border);
}

.info-label {
  font-weight: 600;
  margin-bottom: 4px;
}

/* Selected node styling: increase stroke width and slightly brighten the fill. */
.node circle.selected {
  stroke-width: 4px;
  filter: brightness(1.2);
}

/* Overlay dims the background when the panel is open. */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 999;
  display: none;
}

.overlay.visible {
  display: block;
}