:root {
  --purple: #761468;
  --purple-dark: #4a0d43;
  --purple-pale: #f6edf5;
  --orange: #e27e00;
  --orange-dark: #8a4a00;
  --orange-pale: #fff1df;
  --cyan: #00abc8;
  --cyan-dark: #006f82;
  --cyan-pale: #e9f8fb;
  --green: #257a35;
  --green-pale: #eaf6ec;
  --red: #b3261e;
  --red-pale: #fbe9e7;
  --ink: #18212b;
  --muted: #59636d;
  --line: #d9dee3;
  --pale: #f5f7f8;
  --white: #ffffff;
  --shadow: 0 16px 44px rgba(24, 33, 43, .09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
[hidden] { display: none !important; }

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: #f1f3f5;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

button, input, textarea, select, a { font: inherit; }
img { display: block; max-width: 100%; }
a { color: var(--purple); }

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: -5rem;
  left: 1rem;
  z-index: 50;
  padding: .75rem 1rem;
  color: var(--white);
  background: var(--purple-dark);
  border-radius: .65rem;
}
.skip-link:focus { top: 1rem; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 1rem max(1.25rem, calc((100vw - 1480px) / 2));
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 1rem; min-width: 0; }
.brand img { width: 72px; height: 42px; object-fit: contain; }
.eyebrow { margin: 0; color: var(--purple); font-size: .78rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.brand-title { margin: .12rem 0 0; font-size: 1.05rem; font-weight: 780; }
.header-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .6rem; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: .65rem 1rem;
  border: 1px solid transparent;
  border-radius: .75rem;
  cursor: pointer;
  font-weight: 780;
  text-decoration: none;
  transition: transform .14s ease, box-shadow .14s ease, background .14s ease;
}
.button:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 7px 17px rgba(24, 33, 43, .12); }
.button:disabled { cursor: not-allowed; opacity: .45; }
.button-primary { color: var(--white); background: var(--purple); }
.button-primary:hover:not(:disabled) { background: var(--purple-dark); }
.button-secondary { color: var(--ink); background: var(--white); border-color: var(--line); }
.button-quiet { min-height: 40px; padding: .48rem .8rem; color: var(--purple); background: var(--purple-pale); }
.button-compact { min-height: 38px; padding: .42rem .72rem; font-size: .9rem; }
.button.is-complete { color: #155a1a; background: var(--green-pale); border-color: var(--green); }

.progress-wrap {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) auto;
  align-items: center;
  gap: .8rem;
  max-width: 1480px;
  margin: 0 auto;
  padding: .65rem 1.25rem;
  color: var(--muted);
  font-size: .86rem;
  font-weight: 750;
}
.progress-track { height: 8px; overflow: hidden; background: #dfe3e7; border-radius: 99px; }
.progress-bar { width: 0; height: 100%; background: linear-gradient(90deg, var(--purple), var(--orange)); border-radius: inherit; transition: width .25s ease; }

.lesson-shell {
  display: grid;
  grid-template-columns: 286px minmax(0, 1fr);
  gap: 1rem;
  max-width: 1480px;
  min-height: calc(100vh - 190px);
  margin: 0 auto;
  padding: 0 1.25rem 1.5rem;
}

.lesson-nav,
.lesson-stage {
  min-width: 0;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.lesson-nav { position: sticky; top: 1rem; align-self: start; max-height: calc(100vh - 2rem); overflow: auto; }
.nav-heading {
  position: sticky;
  top: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 1rem;
  background: var(--white);
  border-bottom: 1px solid var(--line);
  font-weight: 850;
}
.icon-button { min-height: 36px; padding: .3rem .55rem; color: var(--purple); background: transparent; border: 0; border-radius: .55rem; cursor: pointer; font-weight: 780; }
.chapter-list { padding: .55rem; }
.nav-group { padding: .15rem 0; border-bottom: 1px solid #eceff1; }
.nav-group:last-child { border-bottom: 0; }
.nav-group > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  min-height: 44px;
  padding: .55rem .65rem;
  color: var(--purple-dark);
  border-radius: .65rem;
  cursor: pointer;
  font-weight: 850;
  list-style: none;
}
.nav-group > summary::-webkit-details-marker { display: none; }
.nav-group > summary::after { content: "+"; order: -1; display: grid; place-items: center; width: 22px; height: 22px; color: var(--purple); background: var(--purple-pale); border-radius: 50%; }
.nav-group[open] > summary::after { content: "−"; }
.group-progress { margin-left: auto; color: var(--muted); font-size: .78rem; font-weight: 750; }
.nav-group ol { display: grid; gap: .18rem; margin: 0; padding: .12rem 0 .5rem; list-style: none; }
.chapter-button {
  width: 100%;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr) 18px;
  align-items: center;
  gap: .55rem;
  padding: .55rem .6rem;
  color: var(--ink);
  background: transparent;
  border: 1px solid transparent;
  border-radius: .68rem;
  text-align: left;
  cursor: pointer;
}
.chapter-button:hover { background: var(--pale); }
.chapter-button[aria-current="step"] { color: var(--purple); background: var(--purple-pale); border-color: #e2cbe0; }
.chapter-number { display: grid; place-items: center; width: 28px; height: 28px; color: var(--muted); background: var(--pale); border-radius: .55rem; font-size: .78rem; font-weight: 850; }
.chapter-button[aria-current="step"] .chapter-number { color: var(--white); background: var(--purple); }
.chapter-name { display: block; min-width: 0; font-size: .87rem; font-weight: 720; line-height: 1.25; }
.chapter-done { color: var(--green); font-weight: 900; }

.lesson-stage { display: flex; flex-direction: column; min-height: 790px; padding: clamp(1.25rem, 3vw, 2.4rem); }
.stage-topline { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: .65rem; }
.section-label { display: inline-flex; padding: .28rem .7rem; color: var(--purple); background: var(--purple-pale); border-radius: 99px; font-size: .78rem; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; }
.slide-count { color: var(--muted); font-size: .86rem; font-weight: 750; }
.lesson-stage h1 { max-width: 980px; margin: 0; font-size: clamp(2rem, 4vw, 3.15rem); line-height: 1.08; letter-spacing: -.03em; }
.lesson-lead { max-width: 940px; margin: .65rem 0 1rem; color: var(--muted); font-size: clamp(1rem, 1.6vw, 1.18rem); }
.lesson-content { min-height: 330px; }

.audio-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.2rem;
  padding: .7rem .8rem;
  background: rgba(255, 255, 255, .96);
  border: 1px solid #d8c3d5;
  border-radius: .85rem;
  box-shadow: 0 8px 22px rgba(74, 13, 67, .08);
  backdrop-filter: blur(10px);
}
.audio-title { display: flex; align-items: center; gap: .65rem; min-width: 155px; }
.audio-icon { display: grid; place-items: center; width: 32px; height: 32px; color: var(--white); background: var(--purple); border-radius: .62rem; font-size: .75rem; }
.audio-title h2 { margin: 0; font-size: .95rem; }
.audio-status { display: block; color: var(--muted); font-size: .78rem; font-weight: 700; }
.audio-controls { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: .45rem; }
.audio-controls label { margin-left: .15rem; font-size: .82rem; font-weight: 780; }
.audio-controls select { min-height: 38px; max-width: 190px; padding: .35rem .5rem; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: .6rem; font-size: .88rem; }

.hero-card { display: grid; grid-template-columns: 1.12fr .88fr; gap: 1.1rem; padding: 1.4rem; color: var(--white); background: linear-gradient(135deg, var(--purple-dark), var(--purple)); border-radius: 1rem; }
.hero-card h2 { margin: .2rem 0 .65rem; font-size: clamp(1.65rem, 3vw, 2.4rem); line-height: 1.12; }
.hero-card p { margin: 0; color: #f0e7ef; }
.hero-card .eyebrow { color: #ffbf6c; }
.tool-route { display: flex; align-items: center; gap: .65rem; margin-top: 1.3rem; }
.tool-route strong { padding: .45rem .75rem; color: var(--ink); background: var(--white); border-radius: .6rem; }
.tool-route strong:last-child { color: var(--orange-dark); background: var(--orange-pale); }
.start-downloads { display: grid; align-content: center; gap: .6rem; padding: 1rem; color: var(--ink); background: var(--white); border-radius: .85rem; }
.start-label { color: var(--purple); font-size: .78rem; font-weight: 850; letter-spacing: .07em; text-transform: uppercase; }
.download-tile { display: grid; gap: .12rem; padding: .72rem .8rem; color: var(--ink); background: var(--pale); border: 1px solid var(--line); border-radius: .7rem; text-decoration: none; }
.download-tile:hover { border-color: var(--purple); }
.download-tile strong { color: var(--purple); }
.download-tile span { color: var(--muted); font-size: .88rem; }

.task-list { display: grid; gap: .55rem; margin: 1rem 0 0; padding: 0; list-style: none; }
.task-list label { display: grid; grid-template-columns: 26px minmax(0, 1fr); gap: .65rem; align-items: start; padding: .78rem .9rem; background: var(--pale); border: 1px solid var(--line); border-radius: .75rem; cursor: pointer; }
.task-list input { width: 21px; height: 21px; margin: .12rem 0 0; accent-color: var(--purple); }
.task-list strong { display: block; margin-bottom: .08rem; }
.task-list span { color: var(--muted); }
.task-list span strong { color: var(--ink); }
.compact-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.setup-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.privacy-note { margin: 1rem 0 0; color: var(--muted); text-align: center; font-weight: 720; }

.route-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .75rem; }
.content-card { position: relative; min-width: 0; padding: 1.05rem; overflow: hidden; background: var(--white); border: 1px solid var(--line); border-radius: .85rem; }
.content-card::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 6px; background: var(--accent, var(--purple)); }
.content-card h2 { margin: 0 0 .55rem; color: var(--accent, var(--purple)); font-size: .9rem; letter-spacing: .03em; text-transform: uppercase; }
.content-card div { display: grid; gap: .28rem; }
.content-card p { margin: 0; color: var(--muted); }
.content-card strong { display: block; }
.content-card strong.big { color: var(--ink); font-size: clamp(1.35rem, 2.4vw, 1.9rem); line-height: 1.14; }
.content-card span { color: var(--muted); font-size: .92rem; }
.tint-purple { --accent: var(--purple); background: var(--purple-pale); }
.tint-orange { --accent: var(--orange); background: var(--orange-pale); }
.tint-cyan { --accent: var(--cyan-dark); background: var(--cyan-pale); }
.tint-green { --accent: var(--green); background: var(--green-pale); }
.checkpoint-banner { display: grid; gap: .15rem; margin-top: 1rem; padding: 1rem; color: var(--purple-dark); background: var(--purple-pale); border-left: 6px solid var(--purple); border-radius: .7rem; }
.checkpoint-banner span { color: var(--muted); }

.campus-row { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .65rem; margin-bottom: .85rem; }
.campus-chip { display: grid; place-items: center; min-height: 62px; padding: .6rem; color: var(--cyan-dark); background: var(--cyan-pale); border: 1px solid #c6e8ee; border-radius: .75rem; font-weight: 850; }
.campus-chip.highlight { color: var(--orange-dark); background: var(--orange-pale); border-color: #f2cc98; }
.card-grid { display: grid; gap: .8rem; }
.card-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.content-heading { margin: 1.2rem 0 .6rem; font-size: 1.2rem; }
.analysis-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .55rem; }
.analysis-grid div { display: grid; gap: .15rem; padding: .8rem; background: var(--pale); border-top: 4px solid var(--purple); border-radius: .55rem; }
.analysis-grid div:nth-child(2) { border-color: var(--cyan-dark); }
.analysis-grid div:nth-child(3) { border-color: var(--orange); }
.analysis-grid div:nth-child(4) { border-color: var(--green); }
.analysis-grid span { color: var(--muted); font-size: .88rem; }
.key-line { margin: 1rem 0 0; padding: .85rem 1rem; color: var(--ink); background: #fbfafb; border: 1px solid #e2d3e0; border-radius: .75rem; }

.reveal-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .65rem; }
.reveal-card { min-width: 0; min-height: 190px; border: 1px solid var(--line); border-radius: .8rem; }
.reveal-card button { width: 100%; height: 100%; display: grid; align-content: start; gap: .45rem; padding: 1rem; color: inherit; background: transparent; border: 0; border-radius: inherit; text-align: left; cursor: pointer; }
.reveal-label { display: grid; place-items: center; width: 42px; height: 42px; color: var(--white); background: var(--accent, var(--purple)); border-radius: .7rem; font-weight: 900; }
.reveal-card strong { line-height: 1.25; }
.reveal-prompt { margin-top: auto; color: var(--accent, var(--purple)); font-size: .85rem; font-weight: 780; }
.reveal-answer { display: none; padding-top: .45rem; color: var(--ink); border-top: 1px solid var(--line); font-weight: 760; }
.reveal-card.revealed .reveal-prompt { display: none; }
.reveal-card.revealed .reveal-answer { display: block; }
.definition-strip { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: .9rem; overflow: hidden; border: 1px solid var(--line); border-radius: .7rem; }
.definition-strip span { display: grid; gap: .1rem; padding: .7rem .8rem; border-right: 1px solid var(--line); }
.definition-strip span:last-child { border-right: 0; }
.definition-strip strong { color: var(--purple); }

.question-panel { padding: clamp(1rem, 3vw, 2rem); background: var(--pale); border: 1px solid var(--line); border-radius: .9rem; text-align: center; }
.question-kicker { margin: 0 0 .8rem; font-size: 1.12rem; font-weight: 820; }
.rating-scale { padding: 1rem; color: var(--purple); background: var(--purple-pale); border-radius: .75rem; font-size: clamp(2rem, 6vw, 3.4rem); font-weight: 900; }
.choice-row { display: flex; flex-wrap: wrap; justify-content: center; gap: .65rem; margin-top: 1rem; }
.choice-button { min-height: 46px; padding: .7rem 1rem; color: var(--ink); background: var(--white); border: 2px solid var(--line); border-radius: .7rem; cursor: pointer; font-weight: 760; }
.choice-button:hover { border-color: var(--purple); }
.choice-button.correct { color: #155a1a; background: var(--green-pale); border-color: var(--green); }
.choice-button.incorrect { color: #8b1b16; background: var(--red-pale); border-color: var(--red); }
.feedback { min-height: 30px; margin: .8rem 0 0; font-weight: 760; }
.feedback.correct { color: var(--green); }
.feedback.incorrect { color: var(--red); }

.tool-comparison { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: stretch; gap: .7rem; }
.tool-card { display: grid; align-content: start; min-width: 0; padding: 1.05rem; border: 1px solid var(--line); border-radius: .85rem; }
.tool-card > span { width: max-content; padding: .25rem .55rem; color: var(--white); background: var(--green); border-radius: 99px; font-size: .78rem; font-weight: 850; }
.tool-card h2 { margin: .75rem 0 .35rem; font-size: 1.15rem; }
.tool-card ul { margin: .3rem 0 .9rem; padding-left: 1.25rem; color: var(--muted); }
.tool-card > strong { margin-top: auto; color: var(--green); }
.tool-card.query > span { background: var(--purple); }
.tool-card.query > strong { color: var(--purple); }
.tool-card.powerbi > span { color: var(--ink); background: var(--orange); }
.tool-card.powerbi > strong { color: var(--orange-dark); }
.tool-bridge { display: grid; place-items: center; color: var(--muted); font-size: 1.7rem; }

.walkthrough { overflow: hidden; background: #f8f9fa; border: 1px solid var(--line); border-radius: .9rem; }
.walkthrough-slide { margin: 0; }
.walkthrough-slide img { width: 100%; max-height: 500px; object-fit: contain; background: #eef0f2; }
.walkthrough-slide figcaption { display: grid; gap: .1rem; padding: .75rem .9rem; background: var(--white); border-top: 1px solid var(--line); }
.walkthrough-slide figcaption strong { color: var(--purple); }
.walkthrough-slide figcaption span { color: var(--muted); font-size: .92rem; }
.walkthrough-controls { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: .7rem; padding: .65rem .75rem; border-top: 1px solid var(--line); }
.walkthrough-controls > span { color: var(--muted); text-align: center; font-size: .86rem; font-weight: 760; }

.checkpoint-form { display: grid; grid-template-columns: 1fr 1fr auto; align-items: end; gap: .75rem; margin-top: 1rem; padding: 1rem; background: var(--purple-pale); border: 1px solid #e3cfe1; border-radius: .8rem; }
.checkpoint-form label { display: grid; gap: .35rem; font-weight: 760; }
.checkpoint-form input { width: 100%; min-height: 44px; padding: .6rem .7rem; background: var(--white); border: 1px solid var(--line); border-radius: .62rem; }
.checkpoint-form .feedback { grid-column: 1 / -1; margin: 0; }

.visual-recipe { display: grid; grid-template-columns: repeat(3, 1fr); gap: .7rem; margin-top: 1rem; }
.visual-recipe > div { position: relative; min-width: 0; padding: 1rem 1rem 1rem 3.6rem; background: var(--pale); border: 1px solid var(--line); border-radius: .8rem; }
.visual-recipe span { position: absolute; top: .9rem; left: .9rem; display: grid; place-items: center; width: 34px; height: 34px; color: var(--white); background: var(--purple); border-radius: .62rem; font-weight: 900; }
.visual-recipe p { margin: .3rem 0 0; color: var(--muted); }

.simulator-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: .75rem; padding: .75rem .85rem; background: var(--pale); border: 1px solid var(--line); border-radius: .8rem; }
.simulator-toolbar > div > span { display: block; margin-bottom: .35rem; font-size: .82rem; font-weight: 800; }
.summary-buttons { display: flex; gap: .35rem; }
.summary-buttons button,
.filter-buttons button { min-height: 38px; padding: .42rem .68rem; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: .55rem; cursor: pointer; }
.summary-buttons button.active,
.filter-buttons button.active { color: var(--white); background: var(--cyan-dark); border-color: var(--cyan-dark); font-weight: 800; }
.summary-feedback { margin: 0; padding: .55rem .7rem; border-radius: .6rem; font-weight: 760; }
.summary-feedback.warning { color: #7a3f00; background: var(--orange-pale); }
.summary-feedback.success { color: #155a1a; background: var(--green-pale); }
.report-layout { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: .8rem; }
.chart-panel,
.report-side { padding: .9rem; background: var(--pale); border: 1px solid var(--line); border-radius: .8rem; }
.chart-panel h2 { margin: 0 0 .65rem; font-size: 1.02rem; }
.bar-chart { display: grid; grid-template-columns: repeat(5, 1fr); align-items: end; gap: .55rem; height: 225px; padding: 1.5rem .4rem 0; border-bottom: 1px solid #b9c0c7; }
.bar-group { display: grid; align-content: end; justify-items: center; height: 100%; }
.bar-value { font-size: .78rem; font-weight: 800; }
.bar { width: min(52px, 70%); min-height: 2px; background: var(--purple); border-radius: .4rem .4rem 0 0; transition: height .25s ease; }
.bar-group:nth-child(4) .bar { background: var(--orange); }
.bar-label { margin-top: .32rem; color: var(--muted); font-size: .72rem; text-align: center; }
.report-side { display: grid; align-content: start; gap: .75rem; }
.report-metric { padding: 1rem; background: var(--white); border-radius: .7rem; text-align: center; }
.report-metric span { display: block; color: var(--orange-dark); font-size: .76rem; font-weight: 850; text-transform: uppercase; }
.report-metric strong { font-size: 1.8rem; }
.filter-buttons { display: grid; gap: .35rem; margin-top: .45rem; }
.report-layout + .privacy-note { margin-bottom: 1rem; }
code { padding: .1em .32em; color: var(--purple-dark); background: var(--purple-pale); border-radius: .3rem; font-family: "Nimbus Mono PS", Consolas, monospace; }

.conclusion-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
.conclusion-grid label { display: grid; gap: .5rem; padding: .9rem; background: var(--pale); border: 1px solid var(--line); border-radius: .8rem; }
.conclusion-grid label > span { display: grid; color: var(--muted); }
.conclusion-grid label strong { color: var(--purple); font-size: 1.05rem; }
.conclusion-grid textarea { width: 100%; min-height: 105px; resize: vertical; padding: .7rem; color: var(--ink); background: var(--white); border: 1px solid #bfc6cc; border-radius: .62rem; line-height: 1.45; }
.conclusion-footer { display: flex; align-items: center; justify-content: space-between; gap: .8rem; margin-top: .7rem; color: var(--muted); font-size: .9rem; }

.quiz-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; }
.quiz-question { min-width: 0; padding: .95rem; background: var(--pale); border: 2px solid transparent; border-radius: .8rem; }
.quiz-question legend { max-width: 100%; margin-bottom: .65rem; font-weight: 850; line-height: 1.35; }
.quiz-question label { display: block; margin: .42rem 0; padding: .3rem .4rem; border-radius: .4rem; }
.quiz-question input { width: 18px; height: 18px; margin-right: .4rem; accent-color: var(--purple); vertical-align: middle; }
.quiz-question.answer-correct { border-color: var(--green); background: var(--green-pale); }
.quiz-question.answer-incorrect { border-color: var(--red); background: var(--red-pale); }
.quiz-submit { margin-top: .9rem; }
.quiz-feedback { margin-top: .8rem; padding: .9rem 1rem; background: var(--pale); border: 1px solid var(--line); border-radius: .8rem; }
.quiz-feedback h3 { margin: 0 0 .25rem; }
.quiz-feedback p { margin: 0; }
.quiz-feedback ol { margin: .65rem 0 0; padding-left: 1.35rem; }
.quiz-feedback.correct { color: #155a1a; background: var(--green-pale); border-color: var(--green); }
.quiz-feedback.incorrect { color: #7f1f19; background: var(--red-pale); border-color: var(--red); }
.quiz-feedback.incomplete { color: #7a3f00; background: var(--orange-pale); border-color: var(--orange); }

.submission-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; }
.submission-grid article { display: grid; align-content: start; gap: .35rem; min-width: 0; padding: 1rem; background: var(--pale); border-top: 5px solid var(--purple); border-radius: .75rem; }
.submission-grid article:nth-child(2) { border-color: var(--orange); }
.submission-grid article:nth-child(3) { border-color: var(--cyan-dark); }
.submission-grid span { color: var(--muted); font-size: .82rem; font-weight: 800; text-transform: uppercase; }
.submission-grid strong { overflow-wrap: anywhere; color: var(--purple-dark); }
.submission-grid p { margin: 0; color: var(--muted); }
.finish-downloads { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1rem; }
.stretch-panel { margin-top: .9rem; padding: .75rem .9rem; background: var(--purple-pale); border: 1px solid #e3cfe1; border-radius: .75rem; }
.stretch-panel summary { color: var(--purple); cursor: pointer; font-weight: 820; }
.stretch-panel ul { margin-bottom: .2rem; }
.reference-line { color: var(--muted); font-size: .9rem; }

.transcript-card { margin-top: 1.2rem; padding: .75rem .9rem; background: #fbfafb; border: 1px solid var(--line); border-radius: .8rem; }
.transcript-card summary { color: var(--purple); cursor: pointer; font-weight: 820; }
#transcript { max-width: 980px; margin: .7rem 0 .15rem; color: var(--muted); }
.stage-actions { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: .7rem; margin-top: auto; padding-top: 1.2rem; }
.stage-actions #complete-button { justify-self: center; }

footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .8rem 1.5rem; max-width: 1480px; margin: 0 auto; padding: 0 1.25rem 1.5rem; color: var(--muted); font-size: .82rem; }

@media (max-width: 1180px) {
  .route-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .reveal-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .tool-comparison { grid-template-columns: 1fr 1fr 1fr; }
  .tool-bridge { display: none; }
}

@media (max-width: 980px) {
  .topbar { align-items: flex-start; }
  .lesson-shell { grid-template-columns: 1fr; }
  .lesson-nav { position: static; max-height: none; }
  .chapter-list { padding-top: .35rem; }
  .nav-group ol { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .25rem; }
  .route-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .analysis-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reveal-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .definition-strip { grid-template-columns: repeat(2, 1fr); }
  .definition-strip span:nth-child(2) { border-right: 0; }
  .definition-strip span:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .tool-comparison { grid-template-columns: 1fr; }
  .checkpoint-form { grid-template-columns: 1fr 1fr; }
  .checkpoint-form button { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .topbar { display: grid; gap: .8rem; padding: .85rem 1rem; }
  .brand img { width: 60px; }
  .header-actions { justify-content: flex-start; }
  .progress-wrap { padding-inline: 1rem; }
  .lesson-shell { padding-inline: .7rem; }
  .lesson-stage { min-height: 0; padding: 1rem; }
  .lesson-stage h1 { font-size: clamp(1.8rem, 9vw, 2.45rem); }
  .audio-strip { display: grid; gap: .65rem; }
  .audio-controls { justify-content: flex-start; }
  .audio-controls select { max-width: 155px; }
  .hero-card,
  .card-grid.two,
  .card-grid.three,
  .campus-row,
  .visual-recipe,
  .report-layout,
  .conclusion-grid,
  .quiz-grid,
  .submission-grid { grid-template-columns: 1fr; }
  .campus-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .setup-list,
  .compact-list { grid-template-columns: 1fr; }
  .route-grid { grid-template-columns: 1fr; }
  .reveal-grid { grid-template-columns: 1fr; }
  .reveal-card { min-height: 0; }
  .tool-comparison { grid-template-columns: 1fr; }
  .walkthrough-slide img { max-height: 360px; }
  .simulator-toolbar { display: grid; }
  .bar-chart { gap: .28rem; }
  .bar-label { writing-mode: vertical-rl; transform: rotate(180deg); }
  .checkpoint-form { grid-template-columns: 1fr; }
  .checkpoint-form button { grid-column: auto; }
  .conclusion-footer { display: grid; }
  .stage-actions { grid-template-columns: 1fr 1fr; }
  .stage-actions #complete-button { grid-column: 1 / -1; grid-row: 1; width: 100%; }
  footer { display: grid; }
}

@media (max-width: 520px) {
  .header-actions { display: grid; }
  .header-actions .button { width: 100%; }
  .brand-title { font-size: .95rem; }
  .nav-group ol { grid-template-columns: 1fr; }
  .audio-controls label { width: 100%; margin-top: .2rem; }
  .audio-controls select { width: 100%; max-width: none; }
  .campus-row { grid-template-columns: 1fr; }
  .analysis-grid { grid-template-columns: 1fr; }
  .definition-strip { grid-template-columns: 1fr; }
  .definition-strip span { border-right: 0; border-bottom: 1px solid var(--line); }
  .definition-strip span:last-child { border-bottom: 0; }
  .walkthrough-controls { grid-template-columns: 1fr 1fr; }
  .walkthrough-controls > span { grid-column: 1 / -1; grid-row: 1; }
  .finish-downloads { display: grid; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

@media print {
  .topbar, .progress-wrap, .lesson-nav, .audio-strip, .stage-actions, footer { display: none !important; }
  body { background: var(--white); }
  .lesson-shell { display: block; padding: 0; }
  .lesson-stage { border: 0; box-shadow: none; }
}