/* ============================================
   CPTS Companion - Interactive Mind Map Styles
   ============================================ */

.explore-container {
  position: relative;
  width: 100%;
  flex: 1;
  min-height: 0;          /* critical for flex child height */
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--htb-black);
}

/* ============================================
   Toolbar
   ============================================ */
.explore-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: var(--htb-dark);
  border-bottom: 1px solid var(--htb-border);
  z-index: 10;
  flex-shrink: 0;
  gap: 1rem;
  flex-wrap: wrap;
}

.toolbar-left, .toolbar-center, .toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.toolbar-right {
  flex-wrap: wrap;
}

.toolbar-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin: 0;
  white-space: nowrap;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--htb-card);
  border: 1px solid var(--htb-border);
  border-radius: 6px;
  padding: 0 0.75rem;
  gap: 0.5rem;
  min-width: 200px;
}
.search-box:focus-within {
  border-color: var(--htb-green);
  box-shadow: 0 0 0 2px rgba(159, 239, 0, 0.1);
}
.search-icon {
  color: var(--htb-green);
  font-weight: 700;
  font-size: 0.85rem;
}
.search-box input {
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.4rem 0;
  outline: none;
  width: 100%;
}
.search-box input::placeholder {
  color: var(--text-muted);
}
.search-kbd {
  background: rgba(110, 118, 129, 0.15);
  border: 1px solid var(--htb-border);
  border-radius: 3px;
  padding: 1px 6px;
  font-size: 0.65rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.toolbar-group {
  display: flex;
  gap: 0.4rem;
}

.toolbar-toggle {
  cursor: pointer;
  display: flex;
}
.toolbar-toggle input { display: none; }
.toggle-chip {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  border: 1px solid var(--htb-border);
  color: var(--text-muted);
  transition: all 0.2s;
  user-select: none;
}
.toolbar-toggle input:checked + .toggle-chip.beginner {
  background: rgba(29, 158, 117, 0.15);
  border-color: #1d9e75;
  color: #1d9e75;
}
.toolbar-toggle input:checked + .toggle-chip.intermediate {
  background: rgba(186, 117, 23, 0.15);
  border-color: #ba7517;
  color: #ba7517;
}
.toolbar-toggle input:checked + .toggle-chip.advanced {
  background: rgba(231, 76, 60, 0.15);
  border-color: #e74c3c;
  color: #e74c3c;
}
.toolbar-toggle input:checked + .toggle-chip.progress-chip {
  background: rgba(0, 212, 255, 0.15);
  border-color: var(--htb-cyan);
  color: var(--htb-cyan);
}
.toolbar-toggle input:checked + .toggle-chip.prereq-chip {
  background: rgba(168, 85, 247, 0.15);
  border-color: var(--htb-purple);
  color: var(--htb-purple);
}

.toolbar-divider {
  width: 1px;
  height: 20px;
  background: var(--htb-border);
}

.toolbar-btn {
  background: var(--htb-card);
  border: 1px solid var(--htb-border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
}
.toolbar-btn:hover {
  border-color: var(--htb-green);
  color: var(--htb-green);
}

/* ============================================
   Graph Viewport
   ============================================ */
.graph-viewport {
  flex: 1;
  min-height: 0;          /* allow flex shrink below content */
  position: relative;
  overflow: hidden;
  cursor: grab;
  background:
    radial-gradient(circle at 50% 50%, rgba(29, 158, 117, 0.03) 0%, transparent 50%),
    var(--htb-black);
}
.graph-viewport:active {
  cursor: grabbing;
}

#graphSvg {
  width: 100%;
  height: 100%;
}

/* D3 node styles */
.graph-node {
  cursor: pointer;
}
.graph-node circle {
  transition: filter 0.2s;
}
.graph-node:hover circle {
  filter: url(#nodeGlow);
}
.graph-node text {
  font-family: var(--font-mono);
  fill: var(--text-primary);
  pointer-events: none;
  font-size: 10px;
}
.graph-node .node-sublabel {
  fill: var(--text-muted);
  font-size: 8px;
}

.graph-link {
  stroke: #21262d;
  stroke-width: 1;
}
.graph-link.active {
  stroke: #1d9e75;
  stroke-width: 2;
}
.graph-link.dimmed {
  opacity: 0.1;
}

.graph-node.dimmed circle {
  opacity: 0.15;
}
.graph-node.dimmed text {
  opacity: 0.15;
}

/* Node difficulty colors */
.graph-node.beginner circle.node-fill { fill: rgba(29, 158, 117, 0.12); stroke: #1d9e75; }
.graph-node.intermediate circle.node-fill { fill: rgba(186, 117, 23, 0.12); stroke: #ba7517; }
.graph-node.advanced circle.node-fill { fill: rgba(231, 76, 60, 0.12); stroke: #e74c3c; }

/* Central CPTS node */
.graph-node.center circle.node-fill {
  fill: rgba(159, 239, 0, 0.08);
  stroke: var(--htb-green);
  stroke-width: 2.5;
}
.graph-node.center text {
  fill: var(--htb-green);
  font-size: 16px;
  font-weight: 700;
}

/* Branch nodes */
.graph-node.branch circle.node-fill {
  stroke-width: 2;
}
.graph-node.branch text {
  font-weight: 600;
  font-size: 11px;
}

/* Progress overlay */
.graph-node.completed circle.node-fill {
  fill: rgba(29, 158, 117, 0.3) !important;
}
.graph-node.in-progress circle.progress-ring {
  stroke: var(--htb-green);
  stroke-dasharray: 4 3;
  animation: pulse-ring 2s ease-in-out infinite;
}
@keyframes pulse-ring {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ============================================
   Minimap
   ============================================ */
.minimap {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  width: 200px;
  height: 140px;
  background: rgba(26, 35, 50, 0.9);
  border: 1px solid var(--htb-border);
  border-radius: 6px;
  overflow: hidden;
  z-index: 5;
  backdrop-filter: blur(4px);
}
.minimap canvas {
  width: 100%;
  height: 100%;
}
.minimap-viewport {
  position: absolute;
  border: 1.5px solid var(--htb-green);
  background: rgba(29, 158, 117, 0.08);
  pointer-events: none;
  transition: all 0.1s;
}

/* ============================================
   Detail Panel
   ============================================ */
.detail-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 360px;
  height: 100%;
  background: var(--htb-dark);
  border-left: 1px solid var(--htb-border);
  z-index: 20;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow-y: auto;
}
.detail-panel.open {
  transform: translateX(0);
}

.detail-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all 0.2s;
}
.detail-close:hover {
  background: var(--htb-card);
  color: var(--text-primary);
}

.detail-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--htb-border);
}
.detail-difficulty {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 3px;
  margin-bottom: 0.5rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.detail-difficulty.beginner { background: rgba(29, 158, 117, 0.15); color: #1d9e75; }
.detail-difficulty.intermediate { background: rgba(186, 117, 23, 0.15); color: #ba7517; }
.detail-difficulty.advanced { background: rgba(231, 76, 60, 0.15); color: #e74c3c; }

.detail-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.25rem;
}
.detail-branch {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}

.detail-body {
  padding: 1.5rem;
  flex: 1;
}
.detail-section {
  margin-bottom: 1.5rem;
}
.detail-section h4 {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}
.detail-section p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.detail-section ul {
  list-style: none;
  padding: 0;
}
.detail-section li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 0.25rem 0;
  padding-left: 1rem;
  position: relative;
}
.detail-section li::before {
  content: '--';
  position: absolute;
  left: 0;
  color: var(--htb-green);
  font-weight: 700;
}

.detail-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.meta-item {
  background: var(--htb-card);
  border: 1px solid var(--htb-border);
  border-radius: 6px;
  padding: 0.75rem;
  text-align: center;
}
.meta-label {
  display: block;
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.25rem;
}
.meta-value {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--htb-green);
}

.detail-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--htb-border);
}
.detail-start-btn {
  display: block;
  text-align: center;
  padding: 0.75rem;
  background: var(--htb-green);
  color: #000;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  transition: all 0.2s;
}
.detail-start-btn:hover {
  background: #b4ff1a;
  transform: translateY(-1px);
  box-shadow: 0 2px 12px rgba(159, 239, 0, 0.3);
  text-decoration: none;
  color: #000;
}

/* ============================================
   Mobile
   ============================================ */
@media (max-width: 768px) {
  .explore-toolbar {
    padding: 0.4rem 0.5rem;
    gap: 0.5rem;
  }
  .toolbar-center { display: none; }
  .search-box { min-width: 140px; }
  .toolbar-group { flex-wrap: wrap; }

  .detail-panel {
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--htb-border);
  }

  .minimap { display: none; }
}