/* Epistemic Knowledge Substrate — Shared Styles */

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #21262d;
  --border: #30363d;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent2: #56d364;
  --accent3: #f78166;
  --accent4: #d2a8ff;

  /* Model accent colors */
  --kg-color: #58a6ff;
  --sn-color: #56d364;
  --onto-color: #d2a8ff;
  --bayes-color: #f0a500;

  /* Relation type colors */
  --rel-is-a: #58a6ff;
  --rel-part-of: #56d364;
  --rel-causes: #f78166;
  --rel-enables: #39d0d8;
  --rel-opposes: #f0a500;
  --rel-requires: #d2a8ff;
  --rel-defines: #e8c77a;
  --rel-supports: #7ee8a2;
  --rel-default: #8b949e;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

/* ── Layout ── */
.app-layout {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

header.app-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

header.app-header h1 {
  font-size: 16px;
  font-weight: 600;
}

header.app-header .back-link {
  font-size: 13px;
  color: var(--text-muted);
}

.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.sidebar {
  width: 280px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  flex-shrink: 0;
  padding: 16px;
}

.canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.canvas-area svg {
  width: 100%;
  height: 100%;
}

.info-panel {
  width: 280px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  flex-shrink: 0;
  padding: 16px;
}

/* ── Sidebar sections ── */
.sidebar-section {
  margin-bottom: 20px;
}

.sidebar-section h3 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* ── Form controls ── */
input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 10px;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
  border-color: var(--accent);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

label {
  font-size: 12px;
  color: var(--text-muted);
  display: block;
  margin-bottom: 4px;
  margin-top: 10px;
}

button {
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
}
button:hover { opacity: 0.85; }
button.secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}
button.danger {
  background: var(--accent3);
  color: #fff;
}

.btn-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

/* ── Checkboxes ── */
.checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.checkbox-list label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--text);
  margin: 0;
}

.checkbox-list input[type="checkbox"] {
  width: auto;
  accent-color: var(--accent);
}

/* ── Tooltip ── */
.tooltip {
  position: fixed;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  pointer-events: none;
  z-index: 1000;
  max-width: 260px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  transition: opacity 0.1s;
}
.tooltip h4 {
  font-size: 14px;
  margin-bottom: 4px;
  color: #fff;
}
.tooltip p {
  color: var(--text-muted);
  font-size: 12px;
  line-height: 1.5;
}
.tooltip .rel-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--border);
  margin-top: 4px;
}

/* ── Info panel content ── */
.info-panel h2 {
  font-size: 16px;
  margin-bottom: 4px;
}
.info-panel .type-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  background: var(--surface2);
  border: 1px solid var(--border);
  margin-bottom: 12px;
}
.info-panel .definition {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
  margin-bottom: 16px;
}
.info-panel h3 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin: 12px 0 6px;
}
.edge-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.edge-list li {
  font-size: 12px;
  color: var(--text-muted);
  padding: 4px 8px;
  background: var(--surface2);
  border-radius: 4px;
  border-left: 3px solid var(--border);
}
.edge-list li .rel {
  color: var(--accent);
  font-weight: 600;
}

/* ── Legend ── */
.legend {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
}
.legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}
.legend-line {
  width: 24px;
  height: 3px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* ── D3 SVG Elements ── */
.node circle {
  stroke-width: 2px;
  cursor: pointer;
  transition: stroke-width 0.15s;
}
.node circle:hover {
  stroke-width: 4px;
}
.node text {
  font-size: 12px;
  fill: var(--text);
  pointer-events: none;
  text-anchor: middle;
  dominant-baseline: middle;
}
.node.selected circle {
  stroke-width: 4px;
  stroke: #fff;
}
.node.dimmed circle {
  opacity: 0.2;
}
.node.dimmed text {
  opacity: 0.2;
}
.node.highlighted circle {
  filter: drop-shadow(0 0 8px currentColor);
}

.link {
  fill: none;
  stroke-width: 1.5px;
  marker-end: url(#arrow);
  opacity: 0.6;
}
.link.dimmed {
  opacity: 0.05;
}
.link.highlighted {
  opacity: 1;
  stroke-width: 3px;
}

.link-label {
  font-size: 10px;
  fill: var(--text-muted);
  pointer-events: none;
}

/* ── Index page ── */
.index-layout {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.index-hero {
  padding: 60px 40px 40px;
  text-align: center;
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}

.index-hero h1 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--onto-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.index-hero p {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  padding: 40px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.model-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}
.model-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.model-card-preview {
  height: 160px;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.model-card-preview svg {
  width: 100%;
  height: 100%;
}

.model-card-body {
  padding: 20px;
}

.model-card-body h2 {
  font-size: 18px;
  margin-bottom: 4px;
}

.model-card-body .formalism {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.model-card-body p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.6;
}

.model-card-body .launch-btn {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  color: #000;
  text-decoration: none;
  background: var(--accent);
  transition: opacity 0.15s;
}
.model-card-body .launch-btn:hover {
  opacity: 0.85;
  text-decoration: none;
}

/* ── Probability display ── */
.prob-value {
  font-size: 13px;
  font-weight: 700;
  fill: #fff;
  text-anchor: middle;
  dominant-baseline: middle;
  pointer-events: none;
}

/* ── Tree (ontology) ── */
.tree-node {
  cursor: pointer;
}
.tree-node circle {
  fill: var(--onto-color);
  stroke: var(--bg);
  stroke-width: 2px;
}
.tree-node text {
  font-size: 12px;
  fill: var(--text);
}
.tree-link {
  fill: none;
  stroke: var(--border);
  stroke-width: 1.5px;
}

/* ── Scrollbars ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { width: 200px; }
  .info-panel { display: none; }
  .model-grid { padding: 20px; gap: 16px; }
  .index-hero { padding: 40px 20px; }
  .index-hero h1 { font-size: 24px; }
}