/* One unframed learning surface, shared by the course and the presentation. */
.section-copy { text-align: center; margin-bottom: 28px; }
.section-copy h2 { margin: 0 0 14px; color: var(--color-hero-bg); font-size: clamp(2rem, 3.3vw, 2.8rem); letter-spacing: -.035em; line-height: 1.16; }
.section-copy h2:focus { outline: none; }
.lead { max-width: 650px; margin: 0 auto; color: var(--color-text-muted); font-size: 1.05rem; line-height: 1.55; }
.figure-media { margin: 0; }
.figure-media img { display: block; width: 100%; height: auto; object-fit: contain; }
.detection-example { max-width: 650px; margin: 0 auto; }
.detection-example figcaption { margin-top: 20px; text-align: center; font-size: .9rem; color: var(--color-text-muted); }
.detection-example figcaption strong { font-weight: 500; color: var(--color-text-main); }
.lesson-image { margin: 0 auto; }
.lesson-image--wide { max-width: 820px; }
.lesson-image--medium { max-width: 560px; }
.lesson-image figcaption { margin-top: 16px; color: var(--color-text-muted); font-size: .9rem; text-align: center; }
.question-layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 64px; align-items: center; max-width: 880px; margin: 32px auto 0; }
.media-container { text-align: center; }
.media-container img { border-radius: 8px; }
.media-toggle { display: inline-flex; align-items: center; gap: 7px; min-height: 44px; padding: 6px 10px; margin-top: 7px; background: transparent; border: 0; color: var(--color-primary-dark); cursor: pointer; font-size: .875rem; }
.quiz-box { min-width: 0; }
.quiz-box fieldset { min-width: 0; border: 0; margin: 0; padding: 0; }
.quiz-box legend { padding: 0; margin-bottom: 18px; font-size: 1.14rem; line-height: 1.45; font-weight: 500; }
.quiz-options { display: grid; }
.quiz-option { display: flex; align-items: center; gap: 12px; padding: 15px 10px; border-bottom: 1px solid #e3e8f0; cursor: pointer; font-size: 1rem; line-height: 1.45; transition: background .15s ease; }
.quiz-option:first-child { border-top: 1px solid #e3e8f0; }
.quiz-option:hover { background: #f5f8ff; }
.quiz-option input { flex-shrink: 0; width: 17px; height: 17px; margin: 0; accent-color: var(--color-primary-dark); }
.quiz-option strong { margin-right: 10px; color: var(--color-primary-dark); font-size: .83rem; font-weight: 500; }
.quiz-option.is-correct { background: #f0faf3; }
.quiz-option.is-incorrect { background: #fff6f5; }
.quiz-status { min-height: 48px; margin: 15px 0 0; color: var(--color-text-muted); font-size: .92rem; line-height: 1.5; }
.quiz-status.correct { color: var(--color-success-text); }
.quiz-status.incorrect { color: var(--color-error-text); }
.iou-lab { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(200px, .75fr); gap: 60px; align-items: center; max-width: 830px; margin: 28px auto 0; }
.iou-stage { border-radius: 10px; background: #f3f9fd; padding: 12px 22px; }
.iou-stage svg { display: block; width: 100%; max-height: 330px; overflow: visible; }
.iou-score { margin: 0; }
.iou-score span { display: block; font-size: .85rem; color: var(--color-text-muted); }
.iou-score strong { display: block; color: var(--color-primary-dark); font-family: var(--font-title); font-size: 5.5rem; letter-spacing: -.05em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.iou-message { min-height: 24px; margin: 8px 0 26px; color: var(--color-text-muted); font-size: .95rem; }
.iou-controls label { display: block; margin-bottom: 8px; font-size: .92rem; }
.iou-controls input { display: block; width: 100%; min-height: 28px; margin: 0; accent-color: var(--color-primary-dark); cursor: ew-resize; }
.range-ends { display: flex; justify-content: space-between; color: #626b7a; font-size: .8rem; }
.practice-path { width: fit-content; max-width: 100%; list-style: none; margin: 40px auto 32px; padding: 0; counter-reset: practice; }
.practice-path li { display: flex; align-items: baseline; column-gap: 12px; margin-bottom: 20px; font-size: 1.1rem; counter-increment: practice; }
.practice-path li::before { content: counter(practice) "."; color: var(--color-primary-dark); font-size: .9rem; font-variant-numeric: tabular-nums; }
.practice-path strong { font-weight: 500; }
.colab-action { display: flex; width: fit-content; margin: 0 auto; padding: 13px 26px; font-size: 1rem; }
.outcome-flow { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; max-width: 780px; margin: 36px auto 0; border: 1px solid #e1e7f0; background: #e1e7f0; }
.outcome-flow div { min-height: 160px; padding: 24px; background: #fff; }
.outcome-flow strong { display: block; margin-bottom: 10px; color: var(--color-primary-dark); font-family: var(--font-title); font-size: 1.4rem; }
.outcome-flow span { color: var(--color-text-muted); font-size: .98rem; line-height: 1.45; }
.evaluation-list { display: grid; gap: 0; }
.evaluation-list p { max-width: 420px; margin: 0; padding: 17px 0; border-bottom: 1px solid #e3e8f0; color: var(--color-text-muted); font-size: 1rem; line-height: 1.5; }
.evaluation-list p:first-child { border-top: 1px solid #e3e8f0; }
.evaluation-list strong { color: var(--color-text-main); font-weight: 600; }
.code-sample { width: min(760px, 100%); box-sizing: border-box; margin: 30px auto 0; padding: 26px 30px; overflow-x: auto; border: 1px solid #e1e7f0; border-radius: 10px; background: #f5f7fb; color: #182136; font: .92rem/1.7 ui-monospace, SFMono-Regular, Consolas, monospace; text-align: left; white-space: pre-wrap; }
.evolution-line { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); max-width: 820px; margin: 36px auto 0; padding: 0; list-style: none; border-top: 1px solid #dfe5ee; }
.evolution-line li { position: relative; padding: 30px 22px 0; border-left: 1px solid #dfe5ee; }
.evolution-line li:last-child { border-right: 1px solid #dfe5ee; }
.evolution-line li::before { content: ''; position: absolute; top: -5px; left: -5px; width: 9px; height: 9px; border-radius: 50%; background: var(--color-primary); }
.evolution-line strong { display: block; margin-bottom: 9px; color: var(--color-primary-dark); font-family: var(--font-title); font-size: 1.1rem; }
.evolution-line span { color: var(--color-text-muted); font-size: .95rem; line-height: 1.45; }
.evolution-line--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); max-width: 920px; }
.evolution-line--5 { grid-template-columns: repeat(5, minmax(0, 1fr)); max-width: 980px; }
.evolution-line--5 li { padding-inline: 16px; }
.evolution-line--7 { grid-template-columns: repeat(7, minmax(0, 1fr)); max-width: 1060px; }
.evolution-line--7 li { padding: 26px 10px 0; }
.evolution-line--7 strong { font-size: .92rem; }
.evolution-line--7 span { font-size: .82rem; }
.plain-columns, .comparison-lanes { display: grid; max-width: 880px; margin: 36px auto 0; border-block: 1px solid #dfe5ee; }
.plain-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.plain-columns--3, .comparison-lanes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.comparison-lanes--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.plain-columns > div, .comparison-lanes > div { min-width: 0; padding: 26px 28px; border-left: 1px solid #dfe5ee; }
.plain-columns > div:last-child, .comparison-lanes > div:last-child { border-right: 1px solid #dfe5ee; }
.plain-columns strong, .comparison-lanes strong { display: block; margin-bottom: 9px; color: var(--color-primary-dark); font-family: var(--font-title); font-size: 1.18rem; line-height: 1.25; }
.plain-columns span, .comparison-lanes span { display: block; color: var(--color-text-muted); font-size: .98rem; line-height: 1.5; }
.question-layout > .media-container img, .question-layout > .lesson-image img { width: 100%; max-height: 330px; object-fit: contain; }
.question-layout--text { grid-template-columns: minmax(0, .8fr) minmax(0, 1fr); }
.architecture-walkthrough { align-items: stretch; max-width: 980px; }
.compact-process { margin: 0; padding: 0; list-style: none; counter-reset: process; }
.compact-process li { display: grid; grid-template-columns: 28px 1fr; gap: 10px; align-items: baseline; padding: 10px 0; border-bottom: 1px solid #e3e8f0; counter-increment: process; color: var(--color-text-muted); line-height: 1.35; }
.compact-process li:first-child { border-top: 1px solid #e3e8f0; }
.compact-process li::before { content: counter(process, decimal-leading-zero); color: var(--color-primary-dark); font-family: var(--font-title); font-size: .78rem; font-variant-numeric: tabular-nums; }
.compact-process strong { color: var(--color-text-main); font-weight: 600; }
.confidence-figure { width: 100%; max-width: 330px; margin: 0 auto; }
.confidence-scale { position: relative; height: 150px; margin: 0 12px; }
.confidence-track { position: absolute; top: 78px; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, #aab3c2 0 50%, var(--color-primary) 50% 100%); }
.confidence-track::before, .confidence-track::after { position: absolute; top: 10px; color: var(--color-text-muted); font-size: .72rem; font-variant-numeric: tabular-nums; }
.confidence-track::before { content: '0'; left: 0; }
.confidence-track::after { content: '1'; right: 0; }
.confidence-threshold { position: absolute; top: 30px; bottom: 42px; left: 50%; border-left: 1px dashed var(--color-primary-dark); }
.confidence-threshold span { position: absolute; top: -2px; left: 7px; color: var(--color-primary-dark); font-size: .75rem; white-space: nowrap; }
.confidence-marker { position: absolute; top: 65px; left: var(--position); display: grid; justify-items: center; transform: translateX(-50%); color: var(--color-primary-dark); }
.confidence-marker::before { content: ''; width: 11px; height: 11px; border: 3px solid #fff; border-radius: 50%; background: var(--color-primary); box-shadow: 0 0 0 1px var(--color-primary); }
.confidence-marker strong { margin-top: -34px; font-family: var(--font-title); font-size: .9rem; }
.confidence-marker span { margin-top: 21px; font-size: .72rem; }
.confidence-marker--hidden { color: #6d7687; }
.confidence-marker--hidden::before { background: #aab3c2; box-shadow: 0 0 0 1px #8a94a4; }
.confidence-marker--high { transform: translateX(-72%); }
.confidence-figure figcaption { margin-top: 4px; color: var(--color-text-muted); font-size: .86rem; line-height: 1.4; text-align: center; }
.lesson-bridge { max-width: 640px; margin: -6px auto 20px; color: var(--color-text-muted); font-size: .92rem; line-height: 1.45; text-align: center; }
.print-detail { display: none; }

@media (max-width: 700px) {
  .section-copy { margin-bottom: 24px; }
  .section-copy h2 { font-size: clamp(1.8rem, 6.5vw, 2.35rem); }
  .lead { font-size: 1rem; }
  .question-layout { grid-template-columns: 1fr; gap: 18px; margin-top: 20px; }
  .question-layout .figure-media { max-width: 190px; margin: 0 auto; }
  .lesson-image--medium { max-width: 360px; }
  .quiz-box legend { font-size: 1.06rem; margin-bottom: 12px; }
  .quiz-option { padding: 13px 6px; }
  .quiz-status { min-height: 0; }
  .iou-lab { grid-template-columns: 1fr; gap: 20px; max-width: 430px; margin-top: 20px; }
  .iou-stage { padding: 0 20px; }
  .iou-stage svg { max-height: 230px; }
  .iou-controls { display: grid; grid-template-columns: 90px 1fr; column-gap: 22px; align-items: end; }
  .iou-score { grid-row: 1 / 4; align-self: start; }
  .iou-score strong { font-size: 3rem; }
  .iou-message { grid-column: 1 / -1; grid-row: 4; margin: 12px 0 0; text-align: center; }
  .iou-controls label, .iou-controls input, .range-ends { grid-column: 2; margin: 0; }
  .range-ends { font-size: .75rem; }
  .practice-path { margin-top: 38px; }
  .practice-path li { font-size: 1rem; margin-bottom: 18px; }
  .detection-example { margin-top: 34px; }
  .detection-example figcaption { margin-top: 22px; font-size: .875rem; }
  .outcome-flow { grid-template-columns: 1fr; margin-top: 20px; }
  .outcome-flow div { min-height: 0; padding: 18px 20px; }
  .question-layout--text { grid-template-columns: 1fr; }
  .evaluation-list { max-width: 360px; margin: 0 auto; }
  .code-sample { margin-top: 20px; padding: 18px; font-size: .78rem; }
  .evolution-line { grid-template-columns: 1fr; max-width: 360px; margin-top: 24px; border-top: 0; }
  .evolution-line li { min-height: 0; padding: 8px 0 18px 22px; border: 0; border-left: 1px solid #dfe5ee; }
  .evolution-line li:last-child { border-right: 0; }
  .evolution-line li::before { top: 10px; }
  .evolution-line--4, .evolution-line--5, .evolution-line--7 { grid-template-columns: 1fr; }
  .evolution-line--7 li { padding: 8px 0 18px 22px; }
  .evolution-line--7 strong { font-size: 1rem; }
  .evolution-line--7 span { font-size: .9rem; }
  .evolution-line--7 { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: 360px; border-top: 1px solid #dfe5ee; }
  .evolution-line--7 li { min-height: 68px; padding: 17px 10px 9px; border-left: 1px solid #dfe5ee; }
  .evolution-line--7 li:last-child { border-right: 1px solid #dfe5ee; }
  .evolution-line--7 li::before { top: -5px; left: -5px; }
  .evolution-line--7 strong { margin-bottom: 5px; font-size: .88rem; }
  .evolution-line--7 span { font-size: .78rem; }
  .plain-columns, .plain-columns--3, .comparison-lanes, .comparison-lanes--two { grid-template-columns: 1fr; max-width: 390px; margin-top: 24px; }
  .plain-columns > div, .comparison-lanes > div { padding: 16px 20px; border-right: 1px solid #dfe5ee; border-bottom: 1px solid #dfe5ee; }
  .plain-columns > div:last-child, .comparison-lanes > div:last-child { border-bottom: 0; }
  .architecture-walkthrough { align-items: center; }
  .compact-process { max-width: 390px; margin: 0 auto; }
  .confidence-figure { max-width: 300px; }
  .lesson-bridge { max-width: 340px; }
}