:root {
  --sidebar-width: 220px;
  --bg: #1a1b26;
  --bg-sidebar: #16161e;
  --bg-card: #24283b;
  --text: #c0caf5;
  --text-muted: #565f89;
  --accent: #7aa2f7;
  --accent-glow: rgba(122, 162, 247, 0.4);
  --border: #3b4261;
  --success: #9ece6a;
  --warning: #e0af68;
  --error: #f7768e;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f5f5; --bg-sidebar: #e8e8e8; --bg-card: #ffffff;
    --text: #1a1b26; --text-muted: #6b7280; --accent: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.3); --border: #d1d5db;
    --success: #16a34a; --warning: #d97706; --error: #dc2626;
  }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg); color: var(--text);
  display: flex; min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-width); background: var(--bg-sidebar);
  border-right: 1px solid var(--border); padding: 0.5rem 0.6rem;
  position: fixed; top: 0; left: 0; bottom: 0;
  overflow-y: auto; z-index: 10;
}
.sidebar h1 { font-size: 1rem; margin-bottom: 1rem; }
.sidebar h1 a { color: var(--text); }
.sidebar details { margin-bottom: 0.5rem; }
.sidebar summary {
  cursor: pointer; font-weight: 600; font-size: 0.85rem;
  padding: 0.3rem 0; color: var(--text-muted);
  list-style: none;
}
.sidebar summary::-webkit-details-marker { display: none; }
.sidebar summary::before { content: '▸ '; }
.sidebar details[open] > summary::before { content: '▾ '; }
.sidebar ul { list-style: none; padding-left: 0.8rem; }
.sidebar li { padding: 0.15rem 0; }
.sidebar li a {
  font-size: 0.8rem; color: var(--text-muted);
  display: block; padding: 0.15rem 0.4rem; border-radius: 3px;
}
.sidebar li a:hover, .sidebar li a.active, .sidebar li a.explorer-active {
  color: var(--accent); background: var(--bg-card); text-decoration: none;
}

/* Main content */
.main {
  margin-left: var(--sidebar-width); flex: 1;
  padding: 0.75rem 1rem;
}
.main h1 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.main h2 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; color: var(--accent); }

/* Story header */
.story-header {
  border-left: 4px solid var(--accent);
  padding: 1rem; margin-bottom: 1.5rem;
  background: var(--bg-card); border-radius: 0 8px 8px 0;
}
.story-header .story-id {
  font-size: 0.8rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.05em;
}
.story-header h1 { margin-top: 0.25rem; }
.badge {
  display: inline-block; font-size: 0.7rem; padding: 0.15rem 0.5rem;
  border-radius: 10px; font-weight: 600; margin-left: 0.5rem;
}
.badge-impl { background: var(--success); color: #000; }
.badge-not-impl { background: var(--warning); color: #000; }
.badge-wontfix { background: var(--error); color: #fff; }
.story-title-inline {
  font-size: 1.1rem; font-weight: 700;
}

/* Compact BDD narrative */
.bdd-compact {
  font-size: 0.85rem; margin-top: 0.4rem; line-height: 1.5;
  color: var(--text);
}
.bdd-kw {
  font-weight: 700; color: var(--accent); font-size: 0.8rem;
  text-transform: lowercase;
}

/* Receipt image — zoom-pane floated left inside story header */
.receipt-pane {
  float: left; margin: 0 1rem 0.5rem 0;
  position: relative;
  transition: box-shadow 0.3s ease;
}
.receipt-pane.active {
  box-shadow: 0 0 12px 4px var(--accent-glow);
  border-radius: 6px;
}
.receipt-image-inline {
  max-height: 280px; width: auto;
  border-radius: 6px; border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  display: block;
}
/* Receipt field bounding box overlay */
.receipt-overlay {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.receipt-overlay rect {
  fill: none; stroke: var(--accent); stroke-width: 1.5;
  opacity: 0; transition: opacity 0.3s ease;
}
.receipt-overlay rect.active { opacity: 0.85; }

/* Legacy receipt image section (kept for compatibility) */
.receipt-image-section {
  margin-bottom: 1.5rem;
  text-align: center;
}
.receipt-image {
  max-height: 350px;
  width: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* Video player */
.video-section { margin-bottom: 1.5rem; }
.video-section video, .video-section img {
  width: 100%; border-radius: 8px; border: 1px solid var(--border);
}
.video-hint {
  font-size: 0.75rem; color: var(--text-muted);
  margin-top: 0.3rem; text-align: center;
}

/* DAG diagram */
.dag-section { margin-bottom: 1.5rem; }
.dag-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 0.5rem;
}
.dag-header h2 { margin: 0; }
.dag-view-toggle { display: flex; gap: 0; }
.toggle-btn {
  font-size: 0.75rem; padding: 0.3rem 0.7rem;
  border: 1px solid var(--border); background: var(--bg-card);
  color: var(--text-muted); cursor: pointer; transition: all 0.15s;
}
.toggle-btn:first-child { border-radius: 4px 0 0 4px; }
.toggle-btn:last-child { border-radius: 0 4px 4px 0; border-left: none; }
.toggle-btn.active {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.toggle-btn:hover:not(.active) { color: var(--text); }
.dag-svg {
  width: 100%; height: auto;
  background: transparent;
}
.dag-fallback-img {
  max-width: 100%; height: auto;
  background: transparent;
}

/* Side-by-side video + DAG grid */
.video-dag-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.video-dag-row .video-section {
  grid-column: 1; grid-row: 1;
  margin-bottom: 0;
}
.video-dag-row .dag-section {
  grid-column: 2; grid-row: 1 / span 3;
  margin-bottom: 0;
  align-self: start;
}
.video-dag-row .dag-section .dag-svg {
  width: auto; max-width: 100%;
  max-height: var(--left-col-height, 80vh);
}
.video-dag-row .below-row {
  grid-column: 1; grid-row: 2;
}

/* DAG node highlighting */
.dag-node { cursor: pointer; transition: opacity 0.2s; }
.dag-node.unreachable { cursor: default; opacity: 0.18; pointer-events: none; }
.dag-edge.unreachable { opacity: 0.11; pointer-events: none; }
.dag-node.active polygon,
.dag-node.active ellipse,
.dag-node.active rect { stroke: #ff6600 !important; stroke-width: 3 !important; }
.dag-node.active text { font-weight: bold !important; }
.dag-cluster.active-cluster > polygon { stroke: #ff6600 !important; stroke-width: 2 !important; }

/* Section boxing in full-path view */
.dag-cluster.section-box > polygon,
.dag-cluster.section-box > path {
  stroke: var(--accent) !important;
  stroke-width: 2.5 !important;
  stroke-dasharray: 8 4 !important;
  fill: rgba(122, 162, 247, 0.06) !important;
}

/* Layer indicator */
.layer-indicator {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 6px; padding: 0.5rem 1rem; margin-bottom: 1rem;
  font-size: 0.85rem; display: flex; align-items: center; gap: 0.5rem;
}
.layer-indicator .layer-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--accent); display: inline-block;
}
.layer-indicator .layer-name { font-weight: 600; }

/* Navigation hints bar */
.nav-hints {
  display: flex; flex-wrap: wrap; gap: 1rem;
  font-size: 0.72rem; color: var(--text-muted);
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 6px; padding: 0.4rem 0.8rem; margin-bottom: 1rem;
}
.nav-hints kbd {
  display: inline-block; padding: 0.05rem 0.3rem;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 3px; font-size: 0.65rem; font-family: inherit;
  vertical-align: baseline;
}

/* BDD narrative */
.bdd { background: var(--bg-card); padding: 1rem; border-radius: 8px; margin-bottom: 1rem; }
.bdd dt { font-weight: 700; color: var(--accent); font-size: 0.85rem; margin-top: 0.5rem; }
.bdd dd { margin-left: 1rem; font-size: 0.9rem; }

/* Acceptance criteria */
.criteria { margin-bottom: 1rem; }
.criteria li {
  padding: 0.3rem 0; font-size: 0.9rem;
  list-style: none; padding-left: 1.5rem; position: relative;
}
.criteria li::before {
  content: '☐'; position: absolute; left: 0; color: var(--text-muted);
}

/* DAG path display */
.dag-path {
  display: flex; flex-wrap: nowrap; gap: 0.3rem;
  align-items: flex-start; margin-bottom: 1rem;
  overflow-x: auto;
}
.dag-path .path-node {
  font-size: 0.75rem; padding: 0.3rem 0.5rem;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 4px; cursor: default; transition: all 0.15s;
  display: flex; flex-direction: column; text-align: center;
}
.dag-path .path-node:not(.clickable) { opacity: 0.45; }
.dag-path .path-node.clickable { cursor: pointer; }
.dag-path .path-node .path-layer-name {
  font-size: 0.6rem; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--text-muted); display: block; margin-bottom: 0.1rem;
  font-weight: 600;
}
.dag-path .path-node.clickable:hover { border-color: var(--accent); }
.dag-path .path-node.active {
  border-color: #ff6600; background: rgba(255, 102, 0, 0.15);
  font-weight: 600;
}
.dag-path .path-arrow { color: var(--text-muted); font-size: 0.7rem; align-self: center; flex-shrink: 0; }
.dag-path > .path-node { flex-shrink: 0; }

/* Tree chip groups */
.path-node-group { display: inline-flex; flex-direction: column; flex-shrink: 0; }
.path-children {
  display: none; flex-direction: column; gap: 0.15rem;
  margin-top: 0.2rem; padding-left: 0.5rem;
}
.path-children.expanded { display: flex; }
.path-child {
  font-size: 0.65rem; padding: 0.2rem 0.4rem;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 3px; cursor: default; transition: all 0.15s;
  white-space: nowrap;
}
.path-child:not(.clickable) { opacity: 0.45; }
.path-child.clickable { cursor: pointer; }
.path-child.clickable:hover { border-color: var(--accent); }
.path-child.active {
  border-color: #ff6600; background: rgba(255, 102, 0, 0.15);
  font-weight: 600;
}
.expand-indicator { font-size: 0.6rem; margin-left: 0.3rem; }

/* Navigation */
.nav-links {
  display: flex; justify-content: space-between;
  margin-top: 2rem; padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.nav-links a {
  padding: 0.5rem 1rem; border-radius: 6px;
  background: var(--bg-card); border: 1px solid var(--border);
}
.nav-links a:hover { border-color: var(--accent); text-decoration: none; }

/* Landing page */
.coming-soon {
  text-align: center; padding: 2rem;
  color: var(--text-muted); font-style: italic;
  background: var(--bg-card); border-radius: 8px;
  border: 1px dashed var(--border);
}

/* DAG Explorer (index page) */
.dag-explorer {
  position: relative; overflow: hidden; cursor: grab;
  border: 1px solid var(--border); border-radius: 8px;
  background: transparent;
  min-height: calc(100vh - 8rem);
}
.dag-explorer:active { cursor: grabbing; }
.dag-explorer .dag-svg {
  transform-origin: 0 0; transition: transform 0.15s ease-out;
  width: 100%; height: auto;
}
.dag-explorer .dag-node.dimmed { opacity: 0.09; transition: opacity 0.3s; }
.dag-explorer .dag-edge.dimmed { opacity: 0.06; transition: opacity 0.3s; }
.dag-explorer .dag-node.story-hl polygon,
.dag-explorer .dag-node.story-hl ellipse,
.dag-explorer .dag-node.story-hl rect {
  stroke-width: 3 !important; filter: drop-shadow(0 0 6px var(--accent-glow));
}
.dag-explorer .dag-node.story-hl text { font-weight: bold !important; }
.dag-explorer .dag-cluster.cluster-hl > polygon {
  stroke-width: 2 !important; filter: drop-shadow(0 0 4px var(--accent-glow));
}

.explorer-status {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: rgba(22, 22, 30, 0.92); backdrop-filter: blur(8px);
  border-top: 1px solid var(--border);
  padding: 0.6rem 1.2rem; display: flex; align-items: center; gap: 1rem;
  font-size: 0.85rem; z-index: 5;
}
@media (prefers-color-scheme: light) {
  .explorer-status { background: rgba(245, 245, 245, 0.92); }
}
.explorer-status .story-counter {
  font-weight: 700; color: var(--accent); min-width: 4.5em; text-align: center;
}
.explorer-status .story-title {
  flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.explorer-status .story-line-swatch {
  flex-shrink: 0; width: 32px; height: 14px;
}
.explorer-status .hints {
  font-size: 0.7rem; color: var(--text-muted); white-space: nowrap;
}
.explorer-status kbd {
  display: inline-block; padding: 0.1rem 0.35rem;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 3px; font-size: 0.65rem; font-family: inherit;
}

/* Zoom panes — independently zoomable regions */
.zoom-pane {
  position: relative; transition: outline-color 0.15s;
  outline: 2px solid transparent; outline-offset: -2px; border-radius: 4px;
}
.zoom-pane.zoom-selected {
  outline-color: var(--accent);
}
.zoom-pane-inner {
  transition: zoom 0.1s ease-out;
}
.zoom-indicator {
  position: absolute; top: 4px; right: 4px;
  font-size: 0.65rem; padding: 0.15rem 0.4rem;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 3px; color: var(--text-muted); z-index: 5;
  opacity: 0; transition: opacity 0.2s; pointer-events: none;
}
.zoom-pane.zoom-selected .zoom-indicator,
.zoom-pane:hover .zoom-indicator { opacity: 1; }
.zoom-resize-buttons {
  position: absolute; top: 4px; left: 4px;
  display: flex; gap: 2px; z-index: 5;
  opacity: 0; transition: opacity 0.2s;
}
.zoom-pane.zoom-selected .zoom-resize-buttons,
.zoom-pane:hover .zoom-resize-buttons { opacity: 1; }
.zoom-resize-btn {
  width: 22px; height: 22px; padding: 0; border: 1px solid var(--border);
  border-radius: 3px; background: var(--bg-card); color: var(--text-muted);
  font-size: 0.8rem; cursor: pointer; display: flex; align-items: center;
  justify-content: center; line-height: 1;
}
.zoom-resize-btn:hover { background: var(--accent); color: #fff; }
.sidebar.zoom-pane { position: fixed; overflow-y: auto; }