.course-model {
  --cm-ink: #10283f;
  --cm-muted: #4f6172;
  --cm-blue: #1a62c6;
  --cm-teal: #24745a;
  --cm-orange: #bd6b37;
  --cm-red: #b94442;
  --cm-paper: #fffefa;
  color: var(--cm-ink);
  border: 1px solid #d2dce4;
  border-radius: 18px;
  background: var(--cm-paper);
  box-shadow: 0 22px 62px rgba(16, 40, 63, .09);
  overflow: hidden;
  margin: 22px 0;
  font-family: Arial, Helvetica, sans-serif;
}
.course-model * { box-sizing: border-box; }
.course-model .cm-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 24px 10px;
}
.course-model .cm-eyebrow {
  display: block;
  color: var(--cm-blue);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: .13em;
}
.course-model h3 {
  margin: 5px 0 0;
  color: var(--cm-ink);
  font: 700 clamp(19px, 2.4vw, 25px)/1.2 Georgia, "Times New Roman", serif;
}
.course-model .cm-concept-badge {
  flex: 0 0 auto;
  border-radius: 999px;
  border: 1px solid #cbd9e7;
  color: var(--cm-blue);
  background: #eaf2fb;
  padding: 6px 10px;
  font-size: 10px;
  font-weight: 800;
}
.course-model .cm-subtitle {
  margin: 0;
  padding: 0 24px 18px;
  color: var(--cm-muted);
  font-size: 14px;
  line-height: 1.5;
}
.course-model .cm-stage {
  margin: 0 14px;
  border: 1px solid #dce7ec;
  border-radius: 14px;
  overflow: hidden;
  background: #f8fbfd;
}
.course-model .cm-scroll {
  width: 100%;
  overflow-x: auto;
  scrollbar-color: #b3c9d8 transparent;
}
.course-model .cm-scroll:focus-visible {
  outline: 3px solid var(--cm-blue);
  outline-offset: -3px;
}
.course-model .cm-scroll-hint { display: block; margin: 7px 0 0; font-size: 12px; color: #526271; }
.course-model svg {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
  max-height: 330px;
}
.course-model .cm-stage-ground {
  fill: #f8fbfd;
  stroke: #e0e9ed;
}
.course-model .cm-lane.edge {
  fill: #e8f1fb;
  stroke: #b7cde6;
}
.course-model .cm-lane.data {
  fill: #e7f3ee;
  stroke: #bddccd;
}
.course-model .cm-lane-label {
  fill: #35627b;
  font: 800 10px Arial, Helvetica, sans-serif;
  letter-spacing: 1.4px;
}
.course-model .cm-node rect {
  fill: #fffefa;
  stroke: #bacbd6;
  stroke-width: 1.5;
  filter: drop-shadow(0 6px 9px rgba(16, 40, 63, .08));
}
.course-model .cm-node.blue rect { fill: #eff6ff; stroke: #8eb9e8; }
.course-model .cm-node.green rect { fill: #e8f5ee; stroke: #99cbb1; }
.course-model .cm-node.red rect { fill: #fff0ee; stroke: #d99690; }
.course-model .cm-node.is-selected rect { stroke-width: 3; }
.course-model .cm-node-title {
  fill: #10283f;
  font: 800 13px Arial, Helvetica, sans-serif;
  letter-spacing: .4px;
}
.course-model .cm-node-sub {
  fill: #4f6172;
  font: 11px Arial, Helvetica, sans-serif;
}
.course-model .cm-wire path {
  fill: none;
  stroke: #a7bbc7;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.course-model .cm-wire.good path { stroke: var(--cm-teal); stroke-width: 3; }
.course-model .cm-wire.bad path { stroke: var(--cm-red); stroke-width: 3; }
.course-model .cm-wire.blue path { stroke: var(--cm-blue); stroke-width: 3; }
.course-model .cm-wire.muted path { stroke-dasharray: 5 6; }
.course-model .cm-wire text {
  fill: #506373;
  font: 700 10px Arial, Helvetica, sans-serif;
  text-anchor: middle;
}
.course-model .cm-stage-note {
  fill: #526477;
  font: 12px Arial, Helvetica, sans-serif;
}
.course-model .cm-controls {
  display: grid;
  gap: 12px;
  padding: 18px 24px 8px;
}
.course-model .cm-control-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.course-model button {
  min-height: 44px;
  border: 1px solid #c2d2de;
  border-radius: 10px;
  background: #f8fbfd;
  color: var(--cm-ink);
  padding: 10px 13px;
  font: 700 12px/1.25 Arial, Helvetica, sans-serif;
  cursor: pointer;
  touch-action: manipulation;
  transition: background-color .15s ease, border-color .15s ease, transform .15s ease;
}
.course-model button:hover:not(:disabled) {
  background: #eaf2fb;
  border-color: var(--cm-blue);
  transform: translateY(-1px);
}
.course-model button[aria-pressed="true"] {
  color: #fff;
  border-color: var(--cm-blue);
  background: var(--cm-blue);
}
.course-model button:disabled { opacity: .45; cursor: not-allowed; }
.course-model button:focus-visible {
  outline: 3px solid var(--cm-orange);
  outline-offset: 2px;
}
.course-model .cm-result {
  min-height: 60px;
  margin: 10px 24px 0;
  padding: 14px 17px;
  border-left: 4px solid var(--cm-teal);
  border-radius: 0 9px 9px 0;
  background: #eaf5ef;
  color: #183d32;
  font-size: 13px;
  line-height: 1.55;
}
.course-model .cm-note {
  margin: 0;
  padding: 13px 24px 22px;
  color: var(--cm-muted);
  font-size: 11px;
  line-height: 1.55;
}
@media (max-width: 650px) {
  .course-model { border-radius: 13px; }
  .course-model .cm-heading { align-items: flex-start; padding: 17px 16px 9px; }
  .course-model .cm-concept-badge { font-size: 9px; }
  .course-model .cm-subtitle { padding: 0 16px 14px; }
  .course-model .cm-stage { margin: 0 8px; }
  .course-model .cm-scroll-hint {
    display: block;
    margin: 0;
    padding: 4px 11px 9px;
    color: var(--cm-muted);
    font-size: 11px;
    font-weight: 700;
  }
  .course-model .cm-controls { padding: 15px 16px 5px; }
  .course-model button { flex: 1 1 auto; }
  .course-model .cm-result { margin: 9px 16px 0; }
  .course-model .cm-note { padding: 12px 16px 18px; }
}
@media (prefers-reduced-motion: reduce) {
  .course-model button { transition: none; }
  .course-model button:hover:not(:disabled) { transform: none; }
}