:root {
  --bg:          #0d1117;
  --bg-panel:    #161b22;
  --bg-raised:   #1c2129;
  --border:      #30363d;
  --text:        #e6edf3;
  --text-dim:    #8b949e;
  --text-faint:  #6e7681;
  --blue:        #58a6ff;
  --green:       #3fb950;
  --red:         #f85149;
  --amber:       #d29922;
  --cyan:        #39c5cf;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

.mono {
  font-family: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

a { color: var(--blue); }

/* ---- header ---- */

.site-header {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
  border-bottom: 1px solid var(--border);
  padding: 14px 20px;
}
.logo { font-size: 18px; font-weight: 700; color: var(--text); text-decoration: none; }
.tagline { color: var(--text-dim); font-size: 13px; }
.stats-bar { margin-left: auto; display: flex; gap: 16px; font-size: 13px; align-items: center; }
.stat { color: var(--text-dim); }
.stat b { color: var(--text); }

.original-link { font-size: 11px; margin-left: 8px; }

.upload-form { display: inline-block; }
.upload-btn {
  font-size: 12px;
  font-weight: 600;
  background: var(--blue);
  color: #0d1117;
  border-radius: 6px;
  padding: 5px 11px;
  cursor: pointer;
}
.upload-btn:hover { opacity: 0.88; }

.error-banner {
  background: rgba(248, 81, 73, 0.12);
  border-bottom: 1px solid rgba(248, 81, 73, 0.4);
  color: var(--red);
  font-size: 13px;
  padding: 8px 20px;
}

/* ---- layout: canvas + side panel ---- */

.layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  height: calc(100vh - 53px);
}

.canvas-pane {
  position: relative;
  overflow: hidden;
  background: var(--bg);
  border-right: 1px solid var(--border);
}

.canvas-help {
  position: absolute;
  bottom: 10px;
  left: 12px;
  font-size: 11px;
  color: var(--text-faint);
  pointer-events: none;
}

.reset-view {
  position: absolute;
  bottom: 10px;
  right: 12px;
  font-size: 12px;
  background: var(--bg-panel);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}
.reset-view:hover { color: var(--text); border-color: var(--text-dim); }

.canvas-toolbar {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 10;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  max-width: calc(100% - 24px);
}

.search-wrap { position: relative; flex-shrink: 0; }
#search-input {
  width: 240px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  padding: 6px 10px;
}
#search-input:focus { outline: none; border-color: var(--blue); }
.search-results {
  display: none;
  position: absolute;
  top: 34px;
  left: 0;
  width: 320px;
  max-height: 320px;
  overflow-y: auto;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  z-index: 20;
}
.search-results.open { display: block; }
.search-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
}
.search-row:last-child { border-bottom: none; }
.search-row:hover { background: var(--bg-raised); }
.search-sub { color: var(--text-faint); font-size: 11px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.region-chips-wrap { display: flex; gap: 6px; flex-wrap: wrap; }

.canvas-legend {
  position: absolute;
  bottom: 30px;
  left: 12px;
  display: flex;
  gap: 12px;
  font-size: 11px;
  color: var(--text-dim);
  pointer-events: none;
}
.lg::before {
  content: "";
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 2px;
  margin-right: 4px;
  vertical-align: -1px;
  border: 1.5px solid;
}
.lg-ic::before { border-color: #58a6ff; }
.lg-conn::before { border-color: #d29922; }
.lg-trans::before { border-color: #bc8cff; }
.lg-diode::before { border-color: #ff7b72; }
.lg-passive::before { border-color: #57606a; }

.region-chip {
  font-size: 11px;
  padding: 3px 9px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}
.region-chip:hover { border-color: var(--text-dim); color: var(--text); }
.region-chip.active { border-color: var(--blue); color: var(--blue); background: rgba(88,166,255,0.12); }

#schematic-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: grab;
}
#schematic-svg:active { cursor: grabbing; }

/* ---- wires ---- */
.wire {
  stroke: #3d444d;
  stroke-width: 0.7;
  pointer-events: none;
}
.wire-hit {
  stroke: transparent;
  stroke-width: 6;
  cursor: pointer;
}
.net.net-power .wire { display: none; }       /* power webs hidden by default */
.net.net-power.active .wire { display: inline; }
.net.active .wire {
  stroke: var(--green);
  stroke-width: 1.4;
}
.net.dimmed .wire { opacity: 0.15; }
.net.dimmed .wire-hit { pointer-events: none; }

/* ---- regions drawn on canvas ---- */
.region-outline {
  fill: none;
  stroke: #30363d;
  stroke-width: 0.6;
  stroke-dasharray: 3 3;
  pointer-events: none;
}
.region-title {
  font-size: 5.5px;
  font-weight: 700;
  fill: #6e7681;
  letter-spacing: 0.03em;
  pointer-events: none;
}

/* ---- components (stroke color = type, see legend) ---- */
.comp-body {
  fill: var(--bg-panel);
  stroke: #57606a;
  stroke-width: 0.7;
  cursor: pointer;
}
.comp.t-ic .comp-body { stroke: #58a6ff; stroke-opacity: 0.75; }
.comp.t-conn .comp-body { stroke: #d29922; stroke-opacity: 0.75; }
.comp.t-trans .comp-body { stroke: #bc8cff; stroke-opacity: 0.75; }
.comp.t-diode .comp-body { stroke: #ff7b72; stroke-opacity: 0.75; }
.comp:hover .comp-body { stroke-width: 1.6; stroke-opacity: 1; fill: #1c2733; }
.comp.selected .comp-body {
  stroke: var(--blue);
  stroke-opacity: 1;
  stroke-width: 1.8;
  fill: rgba(88, 166, 255, 0.18);
}
.comp.peer .comp-body {
  stroke: var(--green);
  stroke-opacity: 1;
  stroke-width: 1.4;
  fill: rgba(63, 185, 80, 0.14);
}
.comp.dimmed { opacity: 0.13; }
.comp.dimmed .comp-body { pointer-events: none; }

.pin {
  fill: #8b949e;
  pointer-events: none;
}
.comp.selected .pin, .comp.peer .pin { fill: var(--text); }

.comp-label {
  font-size: 5px;
  font-family: ui-monospace, monospace;
  fill: var(--text-dim);
  pointer-events: none;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 1.2px;
  stroke-linejoin: round;
}
.comp.selected .comp-label, .comp.peer .comp-label { fill: var(--text); font-weight: 700; }
.label-passive { display: none; }
#schematic-svg.zoomed .label-passive { display: inline; }

/* pin numbers + net names, deep zoom only */
.pin-label {
  display: none;
  font-size: 2.1px;
  font-family: ui-monospace, monospace;
  fill: var(--text-faint);
  pointer-events: none;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 0.5px;
}
#schematic-svg.zoomed2 .pin-label { display: inline; }
#schematic-svg.zoomed2 .comp.dimmed .pin-label { display: none; }

.net-flag {
  font-size: 5px;
  font-weight: 700;
  font-family: ui-monospace, monospace;
  fill: var(--green);
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 1.4px;
  pointer-events: none;
}

.net-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: 0;
}

.reasoning-details summary {
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
  margin-top: 8px;
}
.reasoning-details[open] summary { color: var(--text); }

.overview-region { cursor: pointer; }
.overview-region:hover { border-color: var(--blue); }
.overview-region h3 { display: flex; justify-content: space-between; align-items: baseline; }

.chip-unlabeled { border-style: dashed; }

.ds-fact { padding: 7px 0; border-bottom: 1px solid var(--border); }
.ds-fact:last-of-type { border-bottom: none; }
.ds-fact-text { font-size: 13px; }
.ds-quote {
  font-size: 11.5px;
  color: var(--text-dim);
  font-style: italic;
  margin-top: 3px;
  padding-left: 8px;
  border-left: 2px solid var(--border);
}
.ds-cite { font-style: normal; color: var(--text-faint); white-space: nowrap; }

.board-switcher { display: inline-flex; gap: 6px; }
.board-chip {
  font-size: 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  color: var(--text-dim);
  cursor: pointer;
}
.board-chip:hover { color: var(--text); border-color: var(--text-dim); }
.board-chip.active { color: var(--blue); border-color: var(--blue); background: rgba(88,166,255,0.1); }

.mate-card.confirmed { border-left: 3px solid var(--green); }
.mate-card.proposed { border-left: 3px solid var(--amber); }
.mate-card.rejected { opacity: 0.55; }

.mismatch-warning {
  margin-top: 8px;
  font-size: 12px;
  color: var(--amber);
  background: rgba(210, 153, 34, 0.08);
  border-left: 3px solid var(--amber);
  border-radius: 0 6px 6px 0;
  padding: 6px 10px;
}

/* ---- panel additions ---- */
.chip {
  display: inline-block;
  font-size: 12px;
  font-family: ui-monospace, monospace;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
  margin: 2px 3px 2px 0;
  cursor: pointer;
  color: var(--text);
}
.chip:hover { border-color: var(--blue); color: var(--blue); }

.net-row { padding: 8px 0; border-bottom: 1px solid var(--border); }
.net-row:last-child { border-bottom: none; }
.net-row.active .net-name { color: var(--green); }
.net-name {
  font-size: 13px;
  color: var(--blue);
  cursor: pointer;
  margin-bottom: 4px;
}
.net-name:hover { text-decoration: underline; }
.peer-chips { display: flex; flex-wrap: wrap; }

/* ---- side panel ---- */

.side-column {
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.side-panel {
  overflow-y: auto;
  padding: 16px;
  flex: 1 1 auto;
  min-height: 0;
}

/* ---- chat drawer ---- */

.chat-drawer {
  flex: 0 0 auto;
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
  display: flex;
  flex-direction: column;
  max-height: 55%;
}
.chat-header {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  user-select: none;
}
.chat-header:hover { background: var(--bg-raised); }
.chat-hint { color: var(--text-faint); font-size: 10.5px; font-weight: 400; flex: 1; }
.chat-caret { color: var(--text-dim); transition: transform 0.15s; }
.chat-drawer.collapsed .chat-caret { transform: rotate(-90deg); }
.chat-drawer.collapsed .chat-body { display: none; }

.chat-body {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-top: 1px solid var(--border);
}
.chat-messages {
  overflow-y: auto;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 120px;
}
.chat-msg {
  font-size: 13px;
  line-height: 1.5;
  border-radius: 8px;
  padding: 8px 11px;
  max-width: 95%;
}
.chat-msg-user {
  align-self: flex-end;
  background: rgba(88, 166, 255, 0.14);
  border: 1px solid rgba(88, 166, 255, 0.3);
}
.chat-msg-bot {
  align-self: flex-start;
  background: var(--bg-raised);
  border: 1px solid var(--border);
}
.chat-msg-bot i { color: var(--text-dim); }
.chat-provenance {
  font-size: 10.5px;
  color: var(--text-faint);
  font-family: ui-monospace, monospace;
  margin-top: 5px;
  border-top: 1px dashed var(--border);
  padding-top: 4px;
}
.chat-msg .chip { font-size: 11px; padding: 1px 7px; }

.chat-thinking { color: var(--text-faint); font-style: italic; }

.chat-input-row {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--border);
}
#chat-input {
  flex: 1;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  padding: 7px 10px;
}
#chat-input:focus { outline: none; border-color: var(--blue); }
.chat-send {
  font-size: 13px;
  font-weight: 600;
  background: var(--blue);
  border: none;
  border-radius: 6px;
  color: #0d1117;
  padding: 7px 14px;
  cursor: pointer;
}
.chat-send:disabled { opacity: 0.5; cursor: default; }

.panel-empty { color: var(--text-faint); font-size: 13px; margin-top: 40px; text-align: center; }

.panel-section {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
}
.panel-section h3 {
  margin: 0 0 8px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}
.panel-title { font-size: 17px; font-weight: 600; margin: 0 0 4px; }
.panel-sub { color: var(--text-dim); font-size: 13px; margin-bottom: 10px; }

.confidence-bar {
  height: 4px;
  border-radius: 2px;
  background: var(--bg-raised);
  overflow: hidden;
  margin-top: 4px;
}
.confidence-fill { height: 100%; background: var(--green); }
.confidence-fill.low { background: var(--amber); }

.fact-row { display: flex; justify-content: space-between; gap: 10px; font-size: 13px; padding: 3px 0; }
.fact-row .k { color: var(--text-dim); }
.fact-row .v { color: var(--text); text-align: right; }

.reasoning-block {
  font-size: 12px;
  color: var(--text-dim);
  background: var(--bg-raised);
  border-left: 3px solid var(--border);
  padding: 8px 10px;
  border-radius: 0 6px 6px 0;
  margin-top: 8px;
}

.link-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.link-btn {
  font-size: 12px;
  text-decoration: none;
  color: var(--blue);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 9px;
}
.link-btn:hover { border-color: var(--blue); }

.net-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}
.net-item:hover { background: var(--bg-raised); }
.net-item.active { background: rgba(63,185,80,0.12); color: var(--green); }
.net-item .peers { color: var(--text-faint); font-size: 11px; }

.badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--bg-raised);
  color: var(--text-dim);
  border: 1px solid var(--border);
}
.badge-verified { color: var(--green); border-color: rgba(63,185,80,0.4); background: rgba(63,185,80,0.1); }
.badge-inferred { color: var(--amber); border-color: rgba(210,153,34,0.4); background: rgba(210,153,34,0.1); }

.hint {
  color: var(--text-faint);
  font-size: 12px;
  margin-top: 6px;
}

.finding-card {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  margin-top: 8px;
}
.finding-card.finding-warn { border-left: 3px solid var(--amber); }
.finding-card.finding-info { border-left: 3px solid var(--text-faint); }