@import url('./layout/layout.css');
@import url('./typography/typography.css');
@import url('./controls/controls.css');
@import url('./panels/panels.css');
@import url('./equations/equations.css');
@import url('./timeline/timeline.css');
@import url('./responsive/responsive.css');

:root {
  --viz-canvas: #f7f8fa;
  --viz-surface: #ffffff;
  --viz-ink: #172b4d;
  --viz-muted: #526581;
  --viz-line: #d8dee8;
  --viz-accent: #0065ff;
  --viz-accent-soft: #deebff;
  --viz-radius: 1rem;
  --viz-shadow: 0 1rem 3rem rgba(9, 30, 66, .12);
  --viz-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --viz-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

.k3-learning-tools {
  width: min(1180px, calc(100% - 32px));
  margin: 12px auto 0;
  color: var(--viz-ink);
  font-family: var(--viz-sans);
  position: relative;
  z-index: 20;
}

.k3-learning-tools details {
  width: 100%;
  border: 1px solid var(--viz-line);
  border-radius: .8rem;
  background: var(--viz-surface);
  box-shadow: 0 .35rem 1.2rem rgba(9, 30, 66, .08);
}

.k3-learning-tools summary {
  cursor: pointer;
  padding: .72rem 1rem;
  color: var(--viz-accent);
  font-size: .88rem;
  font-weight: 800;
}

.k3-prerequisite-panel {
  max-height: min(70vh, 42rem);
  overflow: auto;
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--viz-line);
}

.k3-prerequisite-panel h2 { margin: 1rem 0 .35rem; font-size: 1.2rem; }
.k3-prerequisite-panel > p { margin: 0 0 .8rem; color: var(--viz-muted); line-height: 1.5; }
.k3-prerequisite-panel ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .55rem; margin: 0; padding: 0; list-style: none; }
.k3-prerequisite-panel li { min-width: 0; padding: .7rem; border: 1px solid var(--viz-line); border-radius: .65rem; background: var(--viz-canvas); }
.k3-prerequisite-panel li a { display: block; color: var(--viz-accent); font-weight: 800; text-decoration: none; }
.k3-prerequisite-panel li span { display: block; margin-top: .25rem; color: var(--viz-muted); font-size: .82rem; line-height: 1.4; overflow-wrap: anywhere; }
.k3-concept-library-link { display: inline-block; margin-top: .9rem; color: var(--viz-accent); font-weight: 800; }

@media (max-width: 680px) {
  .stage-head, .course-stage-head { font-size: 11px !important; }
  .caption, .stage-caption, .course-caption, .subtitle, .course-subtitle { font-size: 12px !important; line-height: 1.45 !important; }
  .annotation span, .note span, .course-note span { font-size: 11px !important; line-height: 1.4 !important; }
  .annotation b, .note b, .course-note b { font-size: 10px !important; }
  .controls button, .course-controls button { font-size: 11px !important; }
  .k3-learning-tools { width: calc(100% - 20px); }
  .k3-prerequisite-panel ol { grid-template-columns: 1fr; }
}