:root{
  --bg:#ffffff;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --accent:#0ea5e9;
  --edge:#2563eb;
  --edge-future:#7c3aed;
  --surface:#f8fafc;
  --border:#e2e8f0;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color:var(--text);
  background:var(--bg);
}
.topbar{position:sticky;top:0;z-index:5;background:rgba(255,255,255,.8);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--border)}
.topbar .inner{
  max-width:1600px;
  margin:0 auto;
  padding:10px 24px;
  display:flex;
  align-items:center;
  justify-content:space-between
}
.brand{
  font-weight:600;
  letter-spacing:.2px;
  font-size:28px
}
.brand span{
  color:var(--accent)
}
.navlinks{
  display:flex;
  gap:14px
}
.navlinks a{
  color:var(--muted);
  text-decoration:none
}
.navlinks a:hover{
  color:var(--text)
}
.uwflow-link {
  font-weight: bold;
  text-decoration: none;
  font-size: 0.8em;
}
.uwflow-link .uw {
  color: #333;
}
.uwflow-link .flow {
  color: #2F80ED;
}
.container{
  max-width:1600px;
  margin:0 auto;
  padding:24px
}
/* Tighten space between page title and search controls */
header.container{padding-bottom:10px}
main.container{padding-top:10px}
h1{
  margin:0 0 4px;
  font-size:24px
}
.subtitle{margin:0;color:var(--muted); font-size: 14px;}

.subtitle-container {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.subtitle .weight-badge,
.subtitle .grade-badge {
  transform: translateY(-1px);
}

.controls{display:flex;flex-direction:column;gap:12px;align-items:stretch;margin:10px 0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.searchbar{position:relative;display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:8px}
.search-input{position:relative;flex:1 1 420px;display:flex;gap:8px;align-items:center;min-width:260px}
.search-history{flex:1 1 520px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;padding:4px;overflow:hidden}
/* Match course chips in the SVG tree */
.search-history .history-item{
  padding:6px 10px;
  border-radius:8px;
  border:1.5px solid #64748b;
  background:#e2e8f0;
  color:#0f172a;
  cursor:pointer;
  white-space:nowrap;
  font-size:13px;
}
.search-history .history-item:hover{filter:brightness(0.98)}
.option.pref{margin-left:auto;display:flex;gap:6px;align-items:center}
/* highlight styling: stroke only for readability */
.highlight-node{fill:#e2e8f0 !important; stroke:#7a1e2a !important; stroke-width:2.5px !important;}
.highlight-edge{stroke:#7a1e2a !important; stroke-width:2.5px !important;}
.input{flex:1 1 auto;padding:12px 12px;border-radius:10px;border:1px solid var(--border);background:#ffffff;color:var(--text)}
.btn{padding:10px 14px;border-radius:10px;border:1px solid var(--border);background:#f1f5f9;color:var(--text);cursor:pointer}
.btn-accent{background:#e0f2fe;border-color:#bae6fd}
.btn:hover{background:#e2e8f0}
.suggestions{position:absolute;top:calc(100% + 6px);left:0;right:0;max-height:260px;overflow:auto;background:#ffffff;border:1px solid var(--border);border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.08);display:none;z-index:10}
.suggestions.visible{display:block}
.suggestions .item{padding:10px 12px;cursor:pointer;display:flex;justify-content:space-between;gap:8px}
.suggestions .item:hover,.suggestions .item.active{background:#f1f5f9}
.suggestions .code{font-weight:600;color:#0f172a;flex:0 0 auto}
.suggestions .title{color:#475569;flex:1 1 auto;text-align:right}
.option{
  display:flex;
  gap:8px;
  align-items:center
}
.select {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  width: 72px; /* ensure both depth selects have identical size */
  height: 36px;
}
.panel-subcontrols .option{margin-left:0}
/* Make only the Preference select 16px wider */
#pref-select { width: 68px; }
.option.switch{
  display:none
}
.zoom-controls {
  display: flex;
  gap: 8px;
}

.status{min-height:20px;color:var(--muted);margin:10px 0}

.results{display:grid;grid-template-columns:1fr;gap:16px;align-items:start}
.panel{
  background:#ffffff;
  border:1px solid var(--border);
  border-radius:14px;
  padding:12px;
  min-height:300px;
  box-shadow:0 2px 8px rgba(0,0,0,.06);
  position: relative;
}
.panel-header{
  display:flex;
  flex-direction:column;
  align-items:stretch;
  gap:8px;
  margin-bottom:8px;
}
.panel-controls {
  display: flex;
  gap: 16px;
  align-items: center;
  width:100%;
  justify-content: flex-end;
}
.panel-controls .zoom-controls{ margin-left:0; }
.panel-subcontrols{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:16px;
  margin:8px 0 8px 0; /* align vertically under depth row */
}
.panel h2{
  margin:4px 0 12px 0;
  font-size:16px;
  color:#0f172a
}
.panel.center{display:none}

.legend{display:none}
.badge{display:none}

.tree{position:relative;min-height:300px}
.tree svg{width:100%;height:auto;display:block}
.tree{overflow:auto}
.results .panel .tree{
  max-height:80vh
}

.minimap {
  position: absolute;
  bottom: 10px;
  right: 30px;
  width: 120px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.9);
  z-index: 10;
  display: none; /* Hidden by default */
}
.minimap.visible {
  display: block;
}
.minimap-viewport {
  fill: rgba(0, 100, 255, 0.2);
  stroke: rgba(0, 100, 255, 0.5);
  stroke-width: 1px;
}

.node{
  fill:#e2e8f0;
  stroke:#64748b;
  stroke-width:1.5
}
.clickable-node {
  cursor: pointer;
}
.node-label{font-size:13px;font-family:inherit;text-anchor:start;dominant-baseline:middle}
.weight-text{font-size:12px;font-family:inherit;dominant-baseline:middle;font-weight:700}
.edge{stroke:var(--edge);stroke-width:2;fill:none;stroke-linecap:round}
.edge-future{stroke:var(--edge-future);stroke-width:2;fill:none;stroke-linecap:round}
.edge-anchor{fill:var(--edge);opacity:.8;stroke:none}
.edge-anchor-future{fill:var(--edge-future);opacity:.8;stroke:none}
.group-label{fill:#0f172a;font-size:10px;opacity:.8}
.edge-label{fill:#0f172a;font-size:10px;opacity:.8}
.group-box{fill:#e6eef9;stroke:#91a3bc;stroke-width:1.4}
.course-chip{fill:#e2e8f0;stroke:#64748b;stroke-width:1.4}
.or-label{
  fill:#64748b;
  font-size:14px;
  text-anchor:middle
}
.and-label{fill:#0f172a;font-size:12px;text-anchor:middle}
.grade-badge{fill:#e2e8f0}
.grade-text{
  font-size: 12px;
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";
  fill: #4a5568;
  dominant-baseline: middle;
  font-weight: bold;
}

/* Specific overrides for course chips */
.course-chip .node-label{text-anchor:start}
.course-chip .grade-text {
  text-anchor: start;
  font-weight: 500;
}
.course-chip-example {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1.5px solid #64748b;
  background: #e2e8f0;
  color: #0f172a;
  font-size: 13px;
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}
.course-chip-example .chip-detail {
  font-size: 12px;
  color: #475569;
}
.course-chip-example.highlight {
  border-color: #7a1e2a;
  stroke-width: 2.5px !important;
}
.course-chip-example .weight-badge {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 18px;
  height: 15px;
  border-radius: 4px;
  background-color: #e2e8f0;
  font-weight: 700;
  font-size: 10px;
}
.course-chip-example .grade-badge {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: 20px;
  height: 15px;
  border-radius: 4px;
  background-color: #e2e8f0;
  font-weight: 500;
  font-size: 10px;
  color: #4a5568;
  font-weight: 700;
}
.prereq-group-bg {
  fill: none;
  stroke: #64748b95;
  stroke-width: 2;
}

.footnote{color:var(--muted)}

@media (max-width: 980px){
  .results{grid-template-columns:1fr;}
  .panel.center{order:-1}
  .search-input{flex:1 1 100%; min-width:0}
  .search-history{flex:1 1 100%}
}

.donation-widget {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 100;
}

.donation-btn {
  background-color: #ffdd00;
  border: none;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  display: flex;
  justify-content: center;
  align-items: center;
  transition: transform 0.2s ease-in-out;
}

.donation-btn:hover {
  transform: scale(1.1);
}

.coffee-icon {
  width: 36px;
  height: 36px;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background-color: white;
  padding: 32px;
  border-radius: 16px;
  max-width: 480px;
  width: 90%;
  text-align: center;
  position: relative;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.modal-close {
  position: absolute;
  top: 10px;
  right: 10px;
  background: transparent;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #aaa;
}
.modal-close:hover {
  color: #333;
}

.modal-content h2 {
  margin-top: 0;
  font-size: 24px;
  color: #333;
}

.modal-content p {
  margin-bottom: 24px;
  color: #555;
  line-height: 1.6;
}

.bmc-btn {
  background-color: #ffdd00;
  color: #000;
  border-radius: 8px;
  padding: 12px 24px;
  text-decoration: none;
  font-weight: bold;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: background-color 0.2s;
}

.bmc-btn:hover {
  background-color: #f0c400;
}

.bmc-btn img {
  width: 24px;
  height: 24px;
}