/* === Font Faces === */
@font-face {
  font-family: 'IBM Plex Sans';
  font-weight: 400;
  font-style: normal;
  src: url('../fonts/IBMPlexSans-Regular.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Sans';
  font-weight: 500;
  font-style: normal;
  src: url('../fonts/IBMPlexSans-Medium.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Sans';
  font-weight: 600;
  font-style: normal;
  src: url('../fonts/IBMPlexSans-SemiBold.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Serif';
  font-weight: 400;
  font-style: normal;
  src: url('../fonts/IBMPlexSerif-Regular.woff2') format('woff2');
}

@font-face {
  font-family: 'IBM Plex Serif';
  font-weight: 500;
  font-style: normal;
  src: url('../fonts/IBMPlexSerif-Medium.woff2') format('woff2');
}

/* === CSS Variables === */
:root {

  /* === Background === */
  --color-bg: #0F1117;

  /* === Text === */
  --color-text-primary: #E8E8E8;
  --color-text-secondary: #8A8F9E;
  --color-text-disabled: #4A4F5C;

  /* === Layer Node Colors === */
  --color-layer-1: #C87941;
  --color-layer-2: #4A8FA8;
  --color-layer-3: #7A6FA8;
  --color-layer-4: #A86A6A;
  --color-layer-5: #5A7A8A;

  /* === Accent / Interactive === */
  --color-accent: #E8B84B;

  /* === Edge Colors === */
  --color-edge-causal: #3A3F4D;
  --color-edge-causal-hover: #6A7A8A;
  --color-edge-feedback: #C87941;
  --color-edge-solidarity: #4A8FA8;

  /* === Panel and Chrome === */
  --color-panel-bg: #0F1117;
  --color-panel-border: #2A2F3D;
  --color-tooltip-bg: #1A1F2B;

  /* === Typography — Font Families === */
  --font-sans: 'IBM Plex Sans', system-ui, sans-serif;
  --font-serif: 'IBM Plex Serif', Georgia, serif;

  /* === Typography — Weights === */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  /* === Typography — Sizes === */
  --font-size-xs: 10px;
  --font-size-sm: 12px;
  --font-size-base: 16px;
  --font-size-md: 18px;
  --font-size-lg: 22px;
  --font-size-xl: 28px;

  /* === Typography — Line Heights === */
  --line-height-tight: 1.3;
  --line-height-body: 1.65;

  /* === Spacing === */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;

  /* === Layout Dimensions === */
  --panel-width: 380px;
  --sidebar-width: 320px;
  --header-height: 56px;

  /* === Animation === */
  --panel-transition: 180ms ease-out;
  --fade-transition: 150ms ease;

  /* === Z-Index Stack === */
  --z-graph: 1;
  --z-legend: 10;
  --z-tooltip: 100;
  --z-panel: 150;
  --z-sidebar: 160;
  --z-mobile-sheet: 200;
  --z-overlay: 250;

}

/* === Reset === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* === Base === */
html, body {
  height: 100%;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
}

/* === Focus === */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* === Header === */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-panel-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  z-index: var(--z-sidebar);
}

#header-identity {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

#site-name {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

#site-descriptor {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

#header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* === Language Toggle === */
#language-toggle {
  display: flex;
  border: 1px solid var(--color-panel-border);
  border-radius: 6px;
  overflow: hidden;
}

#language-toggle button {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  transition: background-color 120ms ease, color 120ms ease;
  min-height: 36px;
}

#language-toggle button[aria-pressed="true"] {
  background-color: var(--color-accent);
  color: #0F1117;
}

#language-toggle button + button {
  border-left: 1px solid var(--color-panel-border);
}

/* === Find Your Pain Button === */
#fyp-trigger {
  background: transparent;
  border: 1px solid var(--color-accent);
  border-radius: 6px;
  color: var(--color-accent);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  min-height: 36px;
  transition: background-color 120ms ease;
}

#fyp-trigger:hover {
  background: var(--color-tooltip-bg);
}

/* === Main Layout === */
main {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
}

/* === Graph Container === */
#cy {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-graph);
  transition: right var(--panel-transition), left var(--panel-transition);
}

body.panel-open #cy {
  right: var(--panel-width);
}

body.sidebar-open #cy {
  left: var(--sidebar-width);
}

body.panel-open.sidebar-open #cy {
  right: var(--panel-width);
  left: var(--sidebar-width);
}

/* === Layer Legend === */
#layer-legend {
  position: absolute;
  bottom: var(--space-md);
  left: var(--space-md);
  z-index: var(--z-legend);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 2px;
  flex-shrink: 0;
}

.legend-divider {
  height: 1px;
  background-color: var(--color-panel-border);
  margin: var(--space-xs) 0;
}

.legend-loop-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-edge-feedback);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  font-family: var(--font-sans);
  text-align: left;
  transition: opacity 120ms ease;
}

.legend-loop-item:hover {
  opacity: 0.75;
}

.legend-loop-swatch {
  width: 14px;
  height: 3px;
  background-color: var(--color-edge-feedback);
  flex-shrink: 0;
  border-radius: 1px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-edge-feedback) 0px,
    var(--color-edge-feedback) 6px,
    transparent 6px,
    transparent 9px
  );
  background-color: transparent;
}

/* === Detail Panel === */
#detail-panel {
  position: fixed;
  top: var(--header-height);
  right: 0;
  width: var(--panel-width);
  bottom: 0;
  background-color: var(--color-panel-bg);
  border-left: 1px solid var(--color-panel-border);
  z-index: var(--z-panel);
  overflow-y: auto;
  transform: translateX(var(--panel-width));
  transition: transform var(--panel-transition);
  padding: var(--space-lg);
}

#detail-panel:not([hidden]) {
  display: block;
}

#detail-panel.open {
  transform: translateX(0);
}

#panel-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
  padding: var(--space-xs);
}

#panel-close:hover {
  color: var(--color-text-primary);
}

/* === Find Your Pain Sidebar === */
#fyp-sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: var(--sidebar-width);
  bottom: 0;
  background-color: var(--color-panel-bg);
  border-right: 1px solid var(--color-panel-border);
  z-index: var(--z-sidebar);
  overflow-y: auto;
  transform: translateX(calc(-1 * var(--sidebar-width)));
  transition: transform var(--panel-transition);
  display: flex;
  flex-direction: column;
}

#fyp-sidebar:not([hidden]) {
  display: flex;
}

#fyp-sidebar.open {
  transform: translateX(0);
}

#fyp-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-panel-border);
  flex-shrink: 0;
}

#fyp-sidebar-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
}

#fyp-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
  padding: var(--space-xs);
}

#fyp-close:hover {
  color: var(--color-text-primary);
}

#fyp-orientation {
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-style: italic;
  flex-shrink: 0;
}

#fyp-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
}

#fyp-list li button {
  width: 100%;
  background: none;
  border: none;
  border-bottom: 1px solid var(--color-panel-border);
  text-align: left;
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  min-height: 52px;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

#fyp-list li button:hover {
  background-color: var(--color-tooltip-bg);
}

.fyp-primary-label {
  font-size: 15px;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.fyp-secondary-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.fyp-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.fyp-badge {
  font-size: var(--font-size-xs);
  padding: 2px 6px;
  border-radius: 3px;
}

/* === Mobile Sheet === */
#mobile-sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 60vh;
  background-color: var(--color-panel-bg);
  border-top: 1px solid var(--color-panel-border);
  border-radius: 12px 12px 0 0;
  z-index: var(--z-mobile-sheet);
  transform: translateY(100%);
  transition: transform 220ms ease-out, height 220ms ease-out;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#mobile-sheet:not([hidden]) {
  display: flex;
}

#mobile-sheet.open {
  transform: translateY(0);
}

#mobile-sheet.expanded {
  height: 90vh;
  transform: translateY(0);
}

#mobile-sheet-handle {
  width: 40px;
  height: 4px;
  border-radius: 2px;
  background: var(--color-text-disabled);
  margin: 12px auto var(--space-sm);
  flex-shrink: 0;
}

#mobile-sheet-content {
  overflow-y: auto;
  padding: var(--space-md) var(--space-lg);
  flex: 1;
}

/* === Footer === */
#site-footer {
  position: fixed;
  bottom: var(--space-sm);
  right: var(--space-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-disabled);
  z-index: var(--z-legend);
  pointer-events: none;
}

#site-footer a {
  pointer-events: auto;
}

.footer-github-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-disabled);
  opacity: 0.6;
  transition: opacity 150ms ease;
  vertical-align: middle;
}

.footer-github-link:hover {
  opacity: 1;
}

/* === Tooltip === */
#node-tooltip {
  position: fixed;
  max-width: 200px;
  background-color: var(--color-tooltip-bg);
  border: 1px solid var(--color-panel-border);
  border-radius: 6px;
  padding: var(--space-sm) 12px;
  z-index: var(--z-tooltip);
  pointer-events: none;
  display: none;
}

#node-tooltip .tooltip-label {
  font-size: 13px;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

#node-tooltip .tooltip-layer {
  font-size: 11px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

/* === Panel Content Styles === */
.panel-layer-badge {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: var(--space-sm);
}

.panel-node-id {
  font-family: monospace;
  font-size: var(--font-size-sm);
  color: var(--color-text-disabled);
  margin-bottom: var(--space-xs);
  display: block;
}

.panel-node-label {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-sm);
}

.panel-affected-groups {
  font-style: italic;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.panel-rule {
  border: none;
  border-top: 1px solid var(--color-panel-border);
  margin: var(--space-md) 0;
}

.panel-body {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  color: var(--color-text-primary);
}

.panel-body h2 {
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.panel-body h3 {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.panel-body p {
  margin-bottom: var(--space-md);
}

.panel-body ul {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.panel-body li {
  margin-bottom: var(--space-xs);
}

.panel-section-heading {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.panel-node-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.panel-node-link {
  background: none;
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) var(--space-sm);
  text-align: left;
  cursor: pointer;
  transition: border-color 120ms ease;
}

.panel-node-link:hover {
  border-color: var(--color-accent);
}

.panel-amplifies-note {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-style: italic;
  margin-top: -8px;
  margin-bottom: var(--space-md);
}

.panel-loop-link {
  background: none;
  border: 1px solid rgba(200, 121, 65, 0.3);
  border-radius: 4px;
  color: var(--color-edge-feedback);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) var(--space-sm);
  text-align: left;
  cursor: pointer;
  width: 100%;
  transition: border-color 120ms ease;
}

.panel-loop-link:hover {
  border-color: var(--color-edge-feedback);
}

/* === Feedback Callout === */
#feedback-callout {
  position: fixed;
  max-width: 280px;
  background-color: var(--color-tooltip-bg);
  border: 1px solid var(--color-panel-border);
  border-radius: 8px;
  padding: 12px var(--space-md);
  z-index: var(--z-tooltip);
  display: none;
}

#feedback-callout .callout-name {
  font-size: 14px;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-xs);
}

#feedback-callout .callout-desc {
  font-size: 12px;
  line-height: 1.5;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

#feedback-callout-expand {
  background: none;
  border: 1px solid var(--color-panel-border);
  border-radius: 4px;
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  width: 100%;
}

#feedback-callout-expand:hover {
  border-color: var(--color-accent);
}

/* === Mobile Layout === */
@media (max-width: 899px) {
  #site-descriptor {
    display: none;
  }

  /* Graph fills full viewport below header */
  #cy {
    width: 100%;
    height: calc(100vh - var(--header-height));
  }

  /* Desktop panel hidden; mobile sheet handles node cards */
  #detail-panel {
    display: none !important;
  }

  /* Panel-open class must not shrink graph on mobile */
  body.panel-open #cy {
    right: 0;
  }

  #mobile-sheet:not([hidden]) {
    display: flex;
  }

  /* FYP sidebar as full-screen overlay */
  #fyp-sidebar {
    top: 0;
    width: 100%;
    transform: translateX(-100%);
    z-index: var(--z-overlay);
    border-right: none;
  }

  #fyp-sidebar.open {
    transform: translateX(0);
  }

  /* Sidebar is overlay — graph does not shift */
  body.sidebar-open #cy {
    left: 0;
  }

  #layer-legend {
    display: none;
  }
}

/* === Scrollbars === */
#mobile-sheet-content::-webkit-scrollbar,
#detail-panel::-webkit-scrollbar,
#fyp-sidebar::-webkit-scrollbar {
  width: 4px;
}

#mobile-sheet-content::-webkit-scrollbar-track,
#detail-panel::-webkit-scrollbar-track,
#fyp-sidebar::-webkit-scrollbar-track {
  background: transparent;
}

#mobile-sheet-content::-webkit-scrollbar-thumb,
#detail-panel::-webkit-scrollbar-thumb,
#fyp-sidebar::-webkit-scrollbar-thumb {
  background-color: var(--color-panel-border);
  border-radius: 2px;
}

#mobile-sheet-content::-webkit-scrollbar-thumb:hover,
#detail-panel::-webkit-scrollbar-thumb:hover,
#fyp-sidebar::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-text-disabled);
}

/* Mobile sheet close button */
#mobile-sheet-close {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-md);
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 20px;
  cursor: pointer;
  line-height: 1;
  padding: var(--space-xs);
  z-index: 1;
}

#mobile-sheet-close:hover {
  color: var(--color-text-primary);
}

/* Narrow viewports: abbreviate "Lived Experience" → "Lived" */
@media (max-width: 359px) {
  #toggle-experiential {
    font-size: 0;
  }

  #toggle-experiential::before {
    content: "Lived";
    font-size: 10px;
  }

  #toggle-analytical {
    font-size: 10px;
  }
}