/* Step-by-step lab "Where the refractive index comes from" (lecture 11).
   Same look and type scale as refraction_labs.css: 29px on a slide. */

.origin-lab {
  box-sizing: border-box;
  width: min(1760px, 100%);
  margin: 0.2rem auto;
  padding: 0.5rem 0.7rem 0.3rem;
  border: 1px solid rgba(126, 189, 224, 0.36);
  border-radius: 0.35rem;
  background: #08131e;
  color: #edf6fc;
  font: 29px/1.25 system-ui, sans-serif;
  container-type: inline-size;
}

.origin-lab * {
  box-sizing: border-box;
}

.origin-lab__nav,
.origin-lab__text,
.origin-lab__controls,
.origin-lab__readout {
  font-size: clamp(14px, 1.7cqi, 29px);
}

.origin-lab__nav {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.1rem 0.2rem 0.5rem;
  border-bottom: 1px solid rgba(126, 189, 224, 0.25);
}

.origin-lab__step-title {
  flex: 1;
  text-align: center;
  color: #ffd386;
  font-weight: 650;
}

.origin-lab__text {
  margin: 0.35rem 0.2rem 0.4rem;
  color: #dcecf6;
}

.origin-lab__controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14em, 1fr));
  gap: 0.4rem 1.4rem;
  align-items: end;
  padding: 0.1rem 0.2rem 0.4rem;
}

.origin-lab__controls--buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.origin-lab__controls label {
  display: block;
  color: #dcecf6;
}

.origin-lab__controls label > span {
  float: right;
  color: #ffd386;
  font-variant-numeric: tabular-nums;
}

.reveal .origin-lab__controls label > .MathJax_Preview,
.reveal .origin-lab__controls label > .mjx-chtml {
  display: inline-block;
  float: none;
  color: inherit;
  font-variant-numeric: normal;
}

.origin-lab input[type="range"] {
  display: block;
  width: 100%;
  margin: 0.35rem 0 0;
  accent-color: #73d6eb;
}

.origin-lab button {
  padding: 0.2em 0.7em;
  border: 1px solid rgba(126, 189, 224, 0.55);
  border-radius: 0.3rem;
  background: #10263a;
  color: #e7f1f8;
  font: inherit;
  cursor: pointer;
}

.origin-lab button[aria-pressed="true"] {
  background: #1d4561;
}

.origin-lab button:disabled {
  opacity: 0.35;
  cursor: default;
}

.origin-lab svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
  font: 22px/1.2 system-ui, sans-serif;
}

.origin-lab svg text {
  fill: #e5eff7;
}

.origin-lab__readout {
  margin: 0.1rem 0 0;
  padding: 0.35rem 0.6rem;
  color: #e7f1f8;
  text-align: center;
}

.origin-lab__readout span {
  color: #ffd386;
  font-variant-numeric: tabular-nums;
}

.origin-lab__axis {
  stroke: rgba(221, 237, 248, 0.45);
  stroke-width: 2;
}

.origin-lab__cursor {
  stroke: rgba(221, 237, 248, 0.55);
  stroke-width: 2;
  stroke-dasharray: 6 6;
}

.origin-lab__wall {
  stroke: #9fb3c3;
  stroke-width: 8;
}

.origin-lab__spring {
  fill: none;
  stroke: #9fb3c3;
  stroke-width: 3;
}

.origin-lab__spring--thin {
  stroke-width: 2;
  opacity: 0.7;
}

.origin-lab__charge {
  fill: #ffd386;
}

.origin-lab__field-arrow line,
.origin-lab__phasor-incident line {
  stroke: #6ee0ec;
  stroke-width: 6;
}

.origin-lab__field-arrow polygon,
.origin-lab__phasor-incident polygon {
  fill: #6ee0ec;
}

.origin-lab__x-arrow line,
.origin-lab__phasor-charge line {
  stroke: #ffd386;
  stroke-width: 6;
}

.origin-lab__x-arrow polygon,
.origin-lab__phasor-charge polygon {
  fill: #ffd386;
}

.origin-lab__sum-arrow line,
.origin-lab__phasor-sum line {
  stroke: #ffffff;
  stroke-width: 6;
}

.origin-lab__sum-arrow polygon,
.origin-lab__phasor-sum polygon {
  fill: #ffffff;
}

.origin-lab__trace-incident,
.origin-lab__trace-charge,
.origin-lab__trace-velocity,
.origin-lab__trace-sum,
.origin-lab__trace-vacuum {
  fill: none;
  stroke-width: 4;
}

.origin-lab__trace-incident {
  stroke: #6ee0ec;
}

.origin-lab__trace-charge {
  stroke: #ffd386;
}

.origin-lab__trace-velocity {
  stroke: #ffd386;
  stroke-dasharray: 10 8;
  opacity: 0.75;
}

.origin-lab__trace-sum {
  stroke: #ffffff;
}

.origin-lab__trace-vacuum {
  stroke: #6ee0ec;
  stroke-dasharray: 10 8;
  opacity: 0.8;
}

.origin-lab__angle {
  fill: none;
  stroke: #ffffff;
  stroke-width: 2;
}

.origin-lab__zone {
  stroke-width: 10;
  stroke-linecap: butt;
  opacity: 0.25;
}

.origin-lab__zone.is-on {
  opacity: 1;
}

.origin-lab__zone--0,
.origin-lab__spiral--0 {
  stroke: #ffd386;
}

.origin-lab__zone--1,
.origin-lab__spiral--1 {
  stroke: #ff8f7a;
}

.origin-lab__spiral {
  fill: none;
  stroke-width: 4;
}

.origin-lab__ray {
  stroke: rgba(221, 237, 248, 0.5);
  stroke-width: 2;
  stroke-dasharray: 6 6;
}

.origin-lab__ray--axis {
  stroke-dasharray: none;
}

.origin-lab__point {
  fill: #ffffff;
}

.origin-lab__limit {
  fill: none;
  stroke: #ffffff;
  stroke-width: 3;
}

.origin-lab__medium {
  fill: rgba(110, 224, 236, 0.1);
}

.origin-lab__front {
  stroke: #ff8f7a;
  stroke-width: 3;
  stroke-dasharray: 8 6;
}

.origin-lab svg .origin-lab__front-label {
  fill: #ff8f7a;
}

/* Narrow screens: applet pages only; a Reveal slide is scaled as a whole. */
@media (max-width: 900px) {
  body:not(.reveal-viewport) .origin-lab svg {
    font-size: 30px;
  }
}

@media (max-width: 560px) {
  body:not(.reveal-viewport) .origin-lab {
    padding: 0.4rem 0.35rem 0.25rem;
  }
  body:not(.reveal-viewport) .origin-lab svg {
    font-size: 34px;
  }
}

.origin-lab__circle {
  fill: none;
  stroke: rgba(221, 237, 248, 0.25);
  stroke-width: 2;
}

.origin-lab__projection {
  stroke: #ffffff;
  stroke-width: 2;
  stroke-dasharray: 6 6;
  opacity: 0.8;
}

.origin-lab__projection-dot {
  fill: #ffffff;
}

.origin-lab svg .origin-lab__label-incident {
  fill: #6ee0ec;
  font-weight: 700;
}

.origin-lab svg .origin-lab__label-charge {
  fill: #ffd386;
  font-weight: 700;
}

.origin-lab svg .origin-lab__label-sum {
  fill: #ffffff;
  font-weight: 700;
}

.origin-lab svg .origin-lab__cursor-label,
.origin-lab svg .origin-lab__ray-label {
  fill: rgba(221, 237, 248, 0.7);
  font-size: 0.85em;
}

.origin-lab__ring-arrow line {
  stroke: #ffffff;
  stroke-width: 4;
}

.origin-lab__ring-arrow polygon {
  fill: #ffffff;
}

.origin-lab__speed {
  flex: 1 1 14em;
  min-width: 12em;
}

/* On a slide the drawing gives way to the explanation above it. */
.reveal .origin-lab svg {
  max-height: 450px;
}

.origin-lab__exact {
  fill: none;
  stroke: #ffffff;
  stroke-width: 2.5;
  stroke-dasharray: 7 7;
  opacity: 0.8;
}

.origin-lab__exact-dot {
  fill: none;
  stroke: #ffffff;
  stroke-width: 2.5;
}

/* Shared lesson layout: one idea per tab, large equations, separate experiment. */
.origin-lab__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3em;
  padding: 0.1em 0.2em 0.25em;
  font-size: clamp(14px, 1.7cqi, 29px);
}

.origin-lab__tabs button[aria-selected="true"] {
  background: #1d4561;
  border-color: #73d6eb;
  color: #fff;
}

.origin-lab button:focus-visible {
  outline: 2px solid #ffd386;
  outline-offset: 3px;
}

.origin-lab__theory {
  min-height: 8em;
  padding: 0.1em 0.4em 0.2em;
  border-bottom: 1px solid rgba(126, 189, 224, 0.25);
  font-size: clamp(14px, 1.7cqi, 29px);
}

.origin-lab__theory [hidden] {
  display: none !important;
}

.origin-lab__experiment {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
}

.origin-lab__lesson--interactive .origin-lab__theory {
  min-height: 0;
  padding: 0;
  border: 0;
}

.reveal .origin-lab[data-step="1"][data-single],
.reveal .origin-lab[data-step="2"][data-single] {
  height: 840px;
}

.reveal .origin-lab__lesson {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.reveal .origin-lab__lesson .origin-lab__theory {
  flex: 1;
  min-height: 0;
}

.reveal .origin-lab__experiment {
  height: 100%;
  min-height: 0;
}

.origin-lab__lesson-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.5em;
  min-height: 100%;
  padding: 0.4em 0.55em;
}

.origin-lab__lesson-copy .origin-lab__lead,
.origin-lab__lesson-copy .origin-lab__takeaway {
  font-size: clamp(20px, 2.65cqi, 42px);
  line-height: 1.3;
}

.origin-lab__lesson-copy .origin-lab__formula {
  font-size: clamp(24px, 3.65cqi, 58px);
  line-height: 1.25;
}

.origin-lab__lesson-copy .origin-lab__takeaway {
  padding: 0.2em 0 0.2em 0.5em;
  border-left: 4px solid #ffd386;
  color: #ffd386;
}

.origin-lab__lesson-copy .origin-lab__definition {
  font-size: clamp(17px, 2.1cqi, 34px);
  line-height: 1.3;
  color: #bdd0df;
}

.origin-lab__theory p,
.reveal .origin-lab__theory p {
  margin: 0.15em 0;
}

.origin-lab__theory .MathJax_Display,
.reveal .origin-lab__theory .MathJax_Display,
.origin-lab__theory .MJXc-display,
.origin-lab__theory mjx-container[display="true"] {
  margin: 0.3em 0 !important;
}

.origin-lab__fine {
  color: #b9cedd;
  font-size: 0.9em;
}

.origin-lab__zones-controls {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.4em 1em;
  padding-top: 0.4em;
}

.origin-lab__zones-figures,
.origin-lab__lesson-figures {
  display: grid;
  grid-template-columns: 0.96fr 1.04fr;
  align-items: center;
}

.reveal .origin-lab__zones-figures,
.reveal .origin-lab__lesson-figures {
  flex: 1;
  min-height: 0;
  align-items: stretch;
}

.reveal .origin-lab__zones-figures svg,
.reveal .origin-lab__lesson-figures svg {
  height: 100%;
  max-height: none;
  min-height: 0;
}

main.content > .applet-stage--origin {
  width: min(1560px, 100%);
}

.origin-lab__zones-bottom {
  display: flex;
  align-items: center;
  gap: 0.6em;
  font-size: clamp(14px, 1.7cqi, 29px);
}

.origin-lab__zones-bottom > button {
  flex: 0 0 auto;
}

.origin-lab__zones-bottom .origin-lab__readout {
  flex: 1;
  text-align: left;
  padding: 0.15em 0.2em;
}

.origin-lab__zone--quiet {
  stroke: #657482;
}

@media (max-width: 900px) {
  .applet-stage--origin {
    padding: 0.4rem;
  }
  body:not(.reveal-viewport) .origin-lab__zones-controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  body:not(.reveal-viewport) .origin-lab__zones-figures {
    grid-template-columns: 1fr;
  }
  body:not(.reveal-viewport) .origin-lab__lesson-figures {
    grid-template-columns: 1fr;
  }
  body:not(.reveal-viewport) .origin-lab__zones-figures svg,
  body:not(.reveal-viewport) .origin-lab__lesson-figures svg {
    font-size: 22px;
  }
  body:not(.reveal-viewport) .origin-lab__theory {
    min-height: 0;
  }
  body:not(.reveal-viewport) .origin-lab__zones-bottom {
    flex-wrap: wrap;
  }
  body:not(.reveal-viewport) .origin-lab__zones-bottom .origin-lab__readout {
    flex-basis: 100%;
  }
  body:not(.reveal-viewport) .origin-lab__theory [role="tabpanel"] {
    overflow-x: auto;
  }
  body:not(.reveal-viewport) .origin-lab__lesson-copy {
    min-height: 0;
    padding: 0.4em 0;
    gap: 0.5em;
  }
  body:not(.reveal-viewport) .origin-lab__formula {
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.15em 0;
  }
  body:not(.reveal-viewport) .origin-lab__formula .MathJax_Display,
  body:not(.reveal-viewport) .origin-lab__formula mjx-container[display="true"] {
    width: max-content;
    min-width: 100%;
    text-align: left !important;
  }
}