/* ICD-10 Learning Lab — v1.0-RC1 stylesheet.
   Scholarly, calm, humane; no framework; works with zero JavaScript.
   Colour never carries meaning alone — every status also has a text label. */

:root {
  --ink: #1b2430;
  --ink-soft: #445064;
  --ink-faint: #6b7688;
  --paper: #fbfaf7;
  --panel: #ffffff;
  --panel-alt: #f6f4ee;
  --line: #d8dce2;
  --line-soft: #e7e9ee;
  --accent: #35506b;
  --accent-strong: #24384c;
  --accent-tint: #eaf0f5;
  --accent-ink: #ffffff;
  --ok-bg: #eaf3ea;
  --ok-line: #4c7a4c;
  --ok-ink: #2e5a2e;
  --review-bg: #faf1e6;
  --review-line: #93611f;
  --review-ink: #7a4f16;
  --soon-bg: #eef0f3;
  --soon-ink: #5b6472;
  --focus: #b5541a;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-card: 0 1px 2px rgba(27, 36, 48, 0.05), 0 1px 8px rgba(27, 36, 48, 0.06);
  --shadow-card-hover: 0 4px 14px rgba(27, 36, 48, 0.1);
  --max-width: 72rem;
  --max-width-narrow: 46rem;
  font-size: 100%;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 1.0625rem;
}

.wrap { max-width: var(--max-width); margin: 0 auto; padding: 0 1.25rem; }
.wrap-narrow { max-width: var(--max-width-narrow); margin: 0 auto; padding: 0 1.25rem; }

/* --- Skip link --------------------------------------------------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.75rem 1.25rem;
  z-index: 200;
  border-radius: 0 0 6px 0;
}
.skip-link:focus {
  left: 0;
}

/* --- Focus visibility --------------------------------------------- */
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

/* --- Header --------------------------------------------------------- */
.site-header { background: var(--panel); border-bottom: 1px solid var(--line); position: relative; z-index: 20; }
.header-row { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; padding: 0.9rem 1.25rem; }
.brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--ink); font-weight: 700; }
.brand-mark { background: var(--accent); color: var(--accent-ink); font-size: 0.75rem; padding: 0.15rem 0.45rem; border-radius: 4px; font-family: system-ui, sans-serif; }
.primary-nav ul { list-style: none; display: flex; flex-wrap: wrap; gap: 1.1rem; margin: 0; padding: 0; }
.primary-nav a { text-decoration: none; color: var(--ink-soft); font-family: system-ui, sans-serif; font-size: 0.94rem; font-weight: 500; }
.primary-nav a:hover, .primary-nav a:focus { color: var(--accent); text-decoration: underline; }
.primary-nav a.is-current { color: var(--accent); font-weight: 700; }
.site-search { margin-left: auto; display: flex; gap: 0.4rem; }
.site-search input { padding: 0.45rem 0.65rem; border: 1px solid var(--line); border-radius: var(--radius-sm); font-family: system-ui, sans-serif; }
.site-search button { padding: 0.45rem 0.85rem; border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink); border-radius: var(--radius-sm); cursor: pointer; font-family: system-ui, sans-serif; }

.safety-banner { background: #fdf6ea; border-bottom: 1px solid #ecd9ab; font-family: system-ui, sans-serif; font-size: 0.92rem; }
.safety-banner .wrap { padding: 0.6rem 1.25rem; }
.safety-banner a { color: var(--accent); }

.preview-banner { background: #2b2320; color: #fdf1d6; font-family: system-ui, sans-serif; font-size: 0.85rem; text-align: center; padding: 0.4rem 1rem; }

.breadcrumbs { font-family: system-ui, sans-serif; font-size: 0.85rem; color: var(--ink-soft); padding: 0.6rem 1.25rem 0; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 0.3rem; margin: 0; padding: 0; }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: 0.3rem; color: var(--line); }
.breadcrumbs a { color: var(--ink-soft); }

/* --- Main content ----------------------------------------------------- */
main { padding: 1.5rem 0 3rem; }
h1, h2, h3, h4 { font-family: system-ui, -apple-system, sans-serif; color: var(--ink); line-height: 1.25; }
h1 { font-size: 1.9rem; margin-top: 0; }
h2 { font-size: 1.35rem; margin-top: 2.2rem; border-top: 1px solid var(--line); padding-top: 1.2rem; }
h1 + p.eyebrow, .eyebrow { font-family: system-ui, sans-serif; text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.78rem; color: var(--ink-soft); font-weight: 700; }
.eyebrow-on-dark { color: #dfe8f0; }
.eyebrow-tight { margin-bottom: 0.15rem; }
.h2-flush { border-top: none; margin-top: 0; padding-top: 0; }
.is-faded { opacity: 0.6; }
.snippet-full { flex-basis: 100%; }
.lede { font-size: 1.15rem; color: var(--ink-soft); }
.muted { color: var(--ink-soft); font-size: 0.92rem; }
a { color: var(--accent); }
.link-list { padding-left: 1.1rem; }
.link-list li { margin-bottom: 0.5rem; }

blockquote.thesis-quote {
  font-family: system-ui, sans-serif;
  font-size: 1.1rem;
  border-left: 4px solid var(--accent);
  margin: 1.5rem 0;
  padding: 0.5rem 1rem;
  color: var(--ink-soft);
}

.scenario-text { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 1.1rem 1.3rem; box-shadow: var(--shadow-card); }

/* --- Buttons (shared system) ------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  font-family: system-ui, sans-serif; font-weight: 600; font-size: 0.98rem;
  padding: 0.7rem 1.3rem; border-radius: var(--radius-sm); border: 1px solid transparent;
  cursor: pointer; text-decoration: none; line-height: 1.2;
}
.btn-primary, button[type="submit"], .answer-form button {
  background: var(--accent); color: var(--accent-ink); border-color: var(--accent);
}
.btn-primary:hover, button[type="submit"]:hover, .answer-form button:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn-secondary { background: var(--panel); color: var(--accent); border-color: var(--accent); }
.btn-secondary:hover { background: var(--accent-tint); }
.btn-ghost { background: transparent; color: var(--ink-soft); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-block { display: flex; width: 100%; }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.86rem; }

/* --- Dashboard home ------------------------------------------------------ */
.hero-panel {
  background: linear-gradient(155deg, var(--accent-strong), var(--accent) 65%);
  color: #fff; border-radius: var(--radius-lg); padding: 2.1rem 2rem; margin-bottom: 2rem;
}
.hero-panel h1 { color: #fff; margin-bottom: 0.4rem; }
.hero-panel .lede { color: #eef3f8; font-size: 1.1rem; max-width: 46rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.4rem; }
.hero-actions .btn-primary { background: #fff; color: var(--accent-strong); border-color: #fff; }
.hero-actions .btn-primary:hover { background: #eef3f8; }
.hero-actions .btn-secondary { background: rgba(255,255,255,0.08); color: #fff; border-color: rgba(255,255,255,0.55); }
.hero-actions .btn-secondary:hover { background: rgba(255,255,255,0.18); }

.action-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin: 1.5rem 0 2rem;
  list-style: none; padding: 0;
}
.action-card {
  display: flex; flex-direction: column; gap: 0.35rem; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius-md); padding: 1.1rem 1.2rem; text-decoration: none; color: var(--ink);
  box-shadow: var(--shadow-card); transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.action-card:hover, .action-card:focus-visible { box-shadow: var(--shadow-card-hover); transform: translateY(-1px); }
.action-card .action-icon { font-family: system-ui, sans-serif; font-size: 1.5rem; }
.action-card strong { font-family: system-ui, sans-serif; font-size: 1.05rem; }
.action-card span.action-desc { color: var(--ink-soft); font-size: 0.9rem; font-family: system-ui, sans-serif; }
.action-card.is-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.action-card.is-primary span.action-desc { color: #dfe8f0; }

.section-heading-row { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.section-heading-row h2 { margin-bottom: 0; }

.category-map-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 0.85rem; list-style: none; padding: 0; margin: 1rem 0 2rem;
}
.category-map-card {
  display: block; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-md);
  padding: 1rem 1.1rem; text-decoration: none; color: var(--ink); box-shadow: var(--shadow-card);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.category-map-card:hover, .category-map-card:focus-visible { box-shadow: var(--shadow-card-hover); transform: translateY(-1px); }
.category-map-card .code { display: block; font-size: 1.15rem; }
.category-map-card .title { display: block; font-family: system-ui, sans-serif; font-size: 0.95rem; color: var(--ink-soft); margin: 0.1rem 0 0.6rem; }
.progress-bar-track { background: var(--line-soft); border-radius: 999px; height: 8px; overflow: hidden; margin-bottom: 0.5rem; }
.progress-bar-fill { background: var(--accent); height: 100%; border-radius: 999px; }
.progress-bar-fill.is-secure { background: var(--ok-line); }
.category-map-card .map-status { font-family: system-ui, sans-serif; font-size: 0.78rem; color: var(--ink-soft); }

/* --- Chapter map / block/category listings ---------------------------- */
.block-map, .category-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.6rem; }
.block-card, .category-list li {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  border: 1px solid var(--line); border-radius: var(--radius-md); padding: 0.85rem 1.05rem; background: var(--panel);
  box-shadow: var(--shadow-card);
}
.block-card a, .category-list a { text-decoration: none; color: var(--ink); display: flex; gap: 0.6rem; align-items: baseline; flex-wrap: wrap; }
.code { font-family: system-ui, sans-serif; font-weight: 700; color: var(--accent); }
.status-tag {
  font-family: system-ui, sans-serif; font-size: 0.78rem; padding: 0.22rem 0.6rem; border-radius: 999px;
  background: var(--soon-bg); color: var(--soon-ink); border: 1px solid var(--line); white-space: nowrap;
}
.status-available .status-tag,
.status-tag.status-secure_in_this_session { background: var(--ok-bg); border-color: var(--ok-line); color: var(--ok-ink); }
.status-tag.status-developing, .status-tag.status-beginning { background: var(--review-bg); border-color: var(--review-line); color: var(--review-ink); }
.status-active { background: var(--review-bg); border-color: var(--review-line); color: var(--review-ink); }

.coming-soon-panel { background: var(--soon-bg); border: 1px dashed var(--line); border-radius: var(--radius-md); padding: 1rem 1.2rem; }

/* --- Guided path / step tracker ---------------------------------------- */
.step-tracker { list-style: none; padding: 0; margin: 1.5rem 0 2rem; display: grid; gap: 0.6rem; counter-reset: step; }
.step-tracker li {
  counter-increment: step; display: flex; align-items: flex-start; gap: 0.9rem; background: var(--panel);
  border: 1px solid var(--line); border-radius: var(--radius-md); padding: 0.95rem 1.15rem; box-shadow: var(--shadow-card);
  position: relative;
}
.step-tracker li::before {
  content: counter(step); flex: 0 0 auto; width: 2rem; height: 2rem; border-radius: 50%;
  background: var(--accent-tint); color: var(--accent-strong); font-family: system-ui, sans-serif; font-weight: 700;
  display: flex; align-items: center; justify-content: center; font-size: 0.95rem;
}
.step-tracker li.is-done::before { background: var(--ok-line); color: #fff; content: "\2713"; }
.step-tracker li > div { flex: 1; min-width: 0; }
.step-tracker a { font-weight: 700; text-decoration: none; }
.step-tracker a:hover { text-decoration: underline; }
.step-tracker p { margin: 0.25rem 0 0; color: var(--ink-soft); font-family: system-ui, sans-serif; font-size: 0.92rem; }

/* --- Category unit ------------------------------------------------------ */
.category-header .terminology-note { font-size: 0.95rem; color: var(--ink-soft); }
.feature-list dt { font-weight: 700; margin-top: 0.8rem; font-family: system-ui, sans-serif; }
.feature-list dd { margin-left: 0; margin-bottom: 0.4rem; }
.boundary-card { background: var(--panel-alt); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 1.1rem 1.3rem; }
.callout {
  border-left: 4px solid var(--accent); background: var(--accent-tint); border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 0.9rem 1.1rem; margin: 1rem 0; font-family: system-ui, sans-serif; font-size: 0.95rem;
}
.callout strong.callout-label { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent-strong); margin-bottom: 0.3rem; }
.evidence-role-list { list-style: none; padding: 0; }
.evidence-role-list li { margin-bottom: 0.6rem; }
.role-tag { font-family: system-ui, sans-serif; font-size: 0.75rem; font-weight: 700; padding: 0.15rem 0.5rem; border-radius: 4px; margin-right: 0.5rem; border: 1px solid var(--line); display: inline-block; }
.role-supports { background: var(--ok-bg); }
.role-raises-alternative, .role-consistent-not-decisive { background: var(--soon-bg); }
.role-contradicts-or-weakens { background: var(--review-bg); }
.role-missing-and-necessary-to-ask { background: #eef2fb; }

.capsule-grid { display: grid; gap: 0.7rem; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.capsule { border: 1px solid var(--line); border-radius: var(--radius-md); padding: 0.8rem 1rem; background: var(--panel); }
.capsule summary { cursor: pointer; font-weight: 700; font-family: system-ui, sans-serif; }

.case-list, .compare-list, .misconception-list { list-style: none; padding: 0; display: grid; gap: 0.6rem; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.case-list-grid { grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.case-list li, .compare-list li, .misconception-list li { border: 1px solid var(--line); border-radius: var(--radius-md); padding: 0.8rem 1.05rem; background: var(--panel); box-shadow: var(--shadow-card); }
.case-list a, .compare-list a, .misconception-list a { text-decoration: none; color: var(--ink); font-weight: 600; display: block; }
.case-list a:hover, .compare-list a:hover, .misconception-list a:hover { text-decoration: underline; }
.compare-list p, .misconception-list p { margin: 0.3rem 0 0; }
.case-type-tag { font-family: system-ui, sans-serif; font-size: 0.72rem; font-weight: 700; background: var(--accent); color: var(--accent-ink); padding: 0.1rem 0.45rem; border-radius: 4px; margin-right: 0.4rem; }

.revision-card { background: #fbf7ee; border: 2px solid var(--accent); border-radius: var(--radius-md); padding: 1.1rem 1.3rem; }
.safety-notice { font-family: system-ui, sans-serif; font-size: 0.9rem; color: var(--ink-soft); border-top: 1px solid var(--line); padding-top: 1rem; margin-top: 2rem; }
.source-note { font-size: 0.9rem; }

/* --- In-page section navigation (category pages) ------------------------ */
.section-nav-wrap { margin: 1.2rem 0 1.6rem; }
.section-nav {
  display: flex; flex-wrap: wrap; gap: 0.4rem; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius-md); padding: 0.6rem; position: sticky; top: 0; z-index: 10; box-shadow: var(--shadow-card);
}
.section-nav a {
  font-family: system-ui, sans-serif; font-size: 0.82rem; font-weight: 600; text-decoration: none; color: var(--ink-soft);
  padding: 0.4rem 0.65rem; border-radius: var(--radius-sm); white-space: nowrap;
}
.section-nav a:hover, .section-nav a:focus { background: var(--accent-tint); color: var(--accent-strong); }

/* --- Tables (accessible, responsive) ----------------------------------- */
.data-table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
.data-table th, .data-table td { border: 1px solid var(--line); padding: 0.65rem 0.8rem; text-align: left; vertical-align: top; }
.data-table thead th { background: var(--panel-alt); font-family: system-ui, sans-serif; }
.data-table caption { text-align: left; font-weight: 700; margin-bottom: 0.4rem; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* --- Forms / answer options (Case Lab, Decision Lab, Mastery Check) ----- */
.answer-form fieldset { border: 1px solid var(--line); border-radius: var(--radius-md); padding: 1rem; margin: 0 0 1rem; }
.answer-form legend { font-family: system-ui, sans-serif; font-weight: 700; padding: 0 0.4rem; }
.answer-option {
  display: block; padding: 0.75rem 0.9rem; margin-bottom: 0.5rem; border: 1px solid var(--line);
  border-radius: var(--radius-sm); font-size: 1.02rem; cursor: pointer; background: var(--panel);
  transition: border-color 0.12s ease, background 0.12s ease;
}
.answer-option:hover { border-color: var(--accent); background: var(--accent-tint); }
.answer-option:has(input:checked) { border-color: var(--accent); background: var(--accent-tint); font-weight: 600; }
.answer-option:last-child { margin-bottom: 0; }
.answer-option input { margin-right: 0.5rem; }
.answer-option.compact { display: inline-block; margin-right: 0.6rem; padding: 0.4rem 0.7rem; }
.evidence-item { margin-bottom: 1.2rem; }
button[type="submit"], .answer-form button {
  font-family: system-ui, sans-serif; font-weight: 600;
  padding: 0.75rem 1.5rem; border-radius: var(--radius-sm); font-size: 1rem; cursor: pointer; border: none;
}

.feedback-block { border-radius: var(--radius-md); padding: 1.1rem 1.3rem; margin: 1rem 0; font-family: system-ui, sans-serif; }
.feedback-ok { background: var(--ok-bg); border: 2px solid var(--ok-line); }
.feedback-review { background: var(--review-bg); border: 2px solid var(--review-line); }
.verdict-tag { font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.8rem; margin: 0 0 0.4rem; }
.remediation-link { margin-top: 0.6rem; font-weight: 600; }
.remediation-link a { text-decoration: underline; }
.next-activity { margin-top: 0.9rem; padding-top: 0.9rem; border-top: 1px dashed var(--line); font-family: system-ui, sans-serif; font-size: 0.94rem; }

.evidence-results { list-style: none; padding: 0; }
.evidence-results li { border-left: 4px solid var(--line); padding: 0.6rem 1rem; margin-bottom: 0.6rem; background: var(--panel); border-radius: 0 6px 6px 0; }
.evidence-results li.is-correct { border-left-color: var(--ok-line); }
.evidence-results li.is-incorrect { border-left-color: var(--review-line); }

.notice-banner { background: var(--ok-bg); border: 1px solid var(--ok-line); border-radius: var(--radius-md); padding: 0.8rem 1.1rem; font-family: system-ui, sans-serif; }
.misconception-panel, .presentation-mode { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 1.1rem 1.3rem; }
.safety-panel { background: #fdf6ea; border: 1px solid #ecd9ab; border-radius: var(--radius-md); padding: 1rem 1.3rem; }

/* --- Misconception repair sequence --------------------------------------- */
.repair-sequence { list-style: none; padding: 0; margin: 1.3rem 0; display: grid; gap: 0.9rem; counter-reset: rstep; }
.repair-sequence li {
  counter-increment: rstep; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-md);
  padding: 1rem 1.2rem 1rem 3.4rem; position: relative; box-shadow: var(--shadow-card);
}
.repair-sequence li::before {
  content: counter(rstep); position: absolute; left: 1rem; top: 1rem; width: 1.7rem; height: 1.7rem; border-radius: 50%;
  background: var(--accent); color: #fff; font-family: system-ui, sans-serif; font-weight: 700; font-size: 0.85rem;
  display: flex; align-items: center; justify-content: center;
}
.repair-sequence .repair-label { font-family: system-ui, sans-serif; font-weight: 700; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-soft); display: block; margin-bottom: 0.3rem; }
.repair-sequence li.repair-fails { border-left: 4px solid var(--review-line); }
.repair-sequence li.repair-fix { border-left: 4px solid var(--ok-line); }

.guided-path-list { list-style: decimal; padding-left: 1.3rem; }
.guided-path-list li { margin-bottom: 0.6rem; }

/* --- Session dashboard / Mastery Check report --------------------------- */
.dimension-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.8rem; margin: 1.2rem 0 1.6rem; }
.dimension-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 0.9rem 1.1rem; box-shadow: var(--shadow-card); }
.dimension-card .dim-label { font-family: system-ui, sans-serif; font-weight: 700; font-size: 0.92rem; display: block; margin-bottom: 0.4rem; }
.score-tile { display: flex; align-items: baseline; gap: 0.6rem; background: var(--accent-tint); border-radius: var(--radius-md); padding: 1.2rem 1.4rem; margin: 1rem 0 1.5rem; }
.score-tile .score-num { font-family: system-ui, sans-serif; font-size: 2.2rem; font-weight: 800; color: var(--accent-strong); }
.score-tile .score-label { color: var(--ink-soft); font-family: system-ui, sans-serif; }
.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; margin: 1rem 0; }
.summary-panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 1rem 1.2rem; box-shadow: var(--shadow-card); }
.summary-panel h2 { margin-top: 0; border-top: none; padding-top: 0; font-size: 1.1rem; }

/* --- Prev/next category navigation --------------------------------------- */
.prevnext-nav { display: flex; justify-content: space-between; gap: 1rem; margin: 2rem 0; flex-wrap: wrap; }
.prevnext-nav a {
  flex: 1 1 auto; min-width: 140px; border: 1px solid var(--line); border-radius: var(--radius-md); padding: 0.8rem 1rem;
  text-decoration: none; color: var(--ink); background: var(--panel); font-family: system-ui, sans-serif; box-shadow: var(--shadow-card);
}
.prevnext-nav a:hover { border-color: var(--accent); }
.prevnext-nav .direction { display: block; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-soft); }
.prevnext-nav .pn-next { text-align: right; }

/* --- Search results ------------------------------------------------------- */
.search-results { list-style: none; padding: 0; display: grid; gap: 0.6rem; }
.search-results li { border: 1px solid var(--line); border-radius: var(--radius-md); padding: 0.8rem 1.05rem; background: var(--panel); display: flex; align-items: center; gap: 0.7rem; flex-wrap: wrap; box-shadow: var(--shadow-card); }
.result-type-tag { font-family: system-ui, sans-serif; font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; background: var(--panel-alt); color: var(--ink-soft); padding: 0.2rem 0.55rem; border-radius: 4px; }

/* --- Glossary ------------------------------------------------------------- */
.glossary-list { display: grid; gap: 1rem; }
.glossary-entry { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 1rem 1.2rem; box-shadow: var(--shadow-card); }
.glossary-entry dt { font-family: system-ui, sans-serif; font-weight: 700; font-size: 1.05rem; margin-bottom: 0.3rem; }
.glossary-entry dd { margin-left: 0; }
.glossary-jump { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 1rem 0 1.6rem; }
.glossary-jump a { font-family: system-ui, sans-serif; font-size: 0.85rem; text-decoration: none; padding: 0.3rem 0.65rem; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-soft); }
.glossary-jump a:hover { border-color: var(--accent); color: var(--accent); }

/* --- Footer -------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--line); font-family: system-ui, sans-serif; font-size: 0.85rem; color: var(--ink-soft); padding: 1.8rem 0; margin-top: 2rem; }
.footer-grid { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: space-between; }
.site-footer ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.9rem; }
.site-footer a { color: var(--ink-soft); }

/* --- RC2 interaction additions --------------------------------------------- */

/* Home: "Continue where you left off" panel */
.continue-panel {
  background: var(--accent-tint);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.3rem;
  margin: 1.2rem 0 1.6rem;
}
.continue-panel h2 { margin-top: 0; font-size: 1.05rem; }
.continue-panel p { margin: 0.3rem 0 0.8rem; }
.continue-panel .btn:last-child { margin-bottom: 0; }

/* Generic filter bars (Case Lab, Decision Lab) and the Compare selector */
.filter-bar, .compare-selector {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 0.9rem 1.1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  margin: 1rem 0;
  box-shadow: var(--shadow-card);
}
.filter-field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-family: system-ui, sans-serif;
  font-size: 0.88rem;
}
.filter-field label { font-weight: 700; color: var(--ink-soft); }
.filter-field select {
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  color: var(--ink);
  font-size: 0.95rem;
  min-width: 9.5rem;
}
.filter-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-left: auto; }
.filter-count { margin: 0.6rem 0 0.2rem; }

/* Compare selector result states share the callout look */
.compare-selector-result { margin: 1rem 0; }

/* Private, client-only reflection box (Compare detail) */
.reflection-box {
  background: var(--panel-alt);
  border: 1px dashed var(--line);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  margin: 1.2rem 0;
}
.reflection-box label { display: block; font-weight: 700; margin-bottom: 0.4rem; }
.reflection-box textarea {
  width: 100%;
  min-height: 4.5rem;
  font: inherit;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  resize: vertical;
}
.reflection-box .muted { margin-top: 0.4rem; margin-bottom: 0; }

/* Progressive-disclosure controls and cards, reused across the whole pass */
.disclosure-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 0.7rem; margin: 0.8rem 0; }
.disclosure-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 0.2rem 1rem 0.9rem;
  margin-bottom: 0.7rem;
  background: var(--panel);
}
.disclosure-card summary {
  cursor: pointer;
  font-weight: 700;
  padding: 0.7rem 0;
  color: var(--accent-strong);
  font-family: system-ui, sans-serif;
}
.disclosure-card summary:hover { color: var(--accent); }
.disclosure-card[open] summary { border-bottom: 1px solid var(--line-soft); margin-bottom: 0.6rem; }
.disclosure-card > *:last-child { margin-bottom: 0; }
.compare-disclosures { margin: 1.2rem 0; }

/* Misconception staged repair sequence */
.repair-sequence { list-style: none; padding: 0; counter-reset: repair; }
.repair-sequence > li { margin-bottom: 1rem; }
.repair-prompt {
  background: var(--review-bg);
  border: 1px solid var(--review-line);
  border-radius: var(--radius-md);
  padding: 0.8rem 1.1rem;
  color: var(--review-ink);
}
.repair-prompt p:last-child { margin-bottom: 0; }

/* Reasoning timeline (progressive Type C/D cases, Decision Lab revise-provisional) */
.reasoning-timeline {
  list-style: none;
  padding: 0;
  margin: 1.2rem 0;
  display: grid;
  gap: 0;
  border-left: 3px solid var(--line);
}
.reasoning-timeline li {
  position: relative;
  padding: 0.15rem 0 1.1rem 1.3rem;
}
.reasoning-timeline li::before {
  content: "";
  position: absolute;
  left: -0.4625rem;
  top: 0.35rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--panel);
  border: 2px solid var(--line);
}
.reasoning-timeline li.is-done::before { background: var(--ok-line); border-color: var(--ok-line); }
.reasoning-timeline li.is-current::before { background: var(--accent); border-color: var(--accent); }
.reasoning-timeline li.is-current { font-weight: 600; }
.reasoning-timeline .timeline-label {
  display: block;
  font-family: system-ui, sans-serif;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  margin-bottom: 0.2rem;
}
.reasoning-timeline p { margin: 0; }

/* Retrieval cards */
.retrieval-card-list { list-style: none; padding: 0; display: grid; gap: 0.9rem; }
.retrieval-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 0.95rem 1.1rem;
  background: var(--panel);
  box-shadow: var(--shadow-card);
}
.retrieval-question { font-weight: 600; margin-top: 0; }
.retrieval-selfcheck { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem; margin-top: 0.7rem; }
.selfcheck-status { font-family: system-ui, sans-serif; }
.retrieval-card.is-recalled { border-color: var(--ok-line); }
.retrieval-card.is-review { border-color: var(--review-line); }

/* Type F evidence-role cards */
.evidence-card { border: 1px solid var(--line-soft); border-radius: var(--radius-md); padding: 0.9rem 1rem; margin-bottom: 1rem; background: var(--panel); }
.evidence-progress { font-weight: 700; font-family: system-ui, sans-serif; }
.evidence-verdict-line { margin: 0.3rem 0; }

/* Decision Lab four-part feedback panel */
.decision-feedback-panel .callout-label { margin-top: 0.7rem; }
.decision-feedback-panel .callout-label:first-child { margin-top: 0; }

/* Guided Mastery step body + nav */
.guided-step-body {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.2rem 1.4rem;
  margin: 1rem 0 1.5rem;
  box-shadow: var(--shadow-card);
}
.guided-step-body h2:first-child { margin-top: 0; }
.guided-step-nav { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.8rem; margin: 1.2rem 0; }
.guided-step-nav .btn:only-child { margin-left: auto; }

/* Category-page section nav: scrollspy active state + position readout */
.section-nav a.is-active { background: var(--accent); color: #fff; }
.section-position { margin: 0.4rem 0 0; }

/* Category prev/next, return-to-top */
.return-to-top { margin: 1.2rem 0 0.4rem; }
.return-to-guided { font-family: system-ui, sans-serif; font-size: 0.9rem; margin: 0.6rem 0 1.1rem; }
.return-to-guided a { text-decoration: none; }
.return-to-guided a:hover { text-decoration: underline; }

/* Glossary entries as <details> */
.glossary-entry summary {
  cursor: pointer;
  font-family: system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.15rem 0;
}
.glossary-entry[open] summary { margin-bottom: 0.3rem; }
.glossary-entry p:last-child { margin-bottom: 0; }

/* Search: type chips + clear control + highlight */
.type-chip-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.8rem 0 1.1rem; }
.type-chip {
  font-family: system-ui, sans-serif;
  font-size: 0.85rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink-soft);
  cursor: pointer;
}
.type-chip:hover { border-color: var(--accent); color: var(--accent); }
.type-chip.is-active { background: var(--accent); border-color: var(--accent); color: #fff; }
.search-clear {
  font-size: 1.3rem;
  line-height: 1;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0 0.4rem;
}
.search-clear:hover { color: var(--accent); }
mark { background: #fbe8a6; color: inherit; border-radius: 2px; padding: 0 0.1em; }

/* Teacher Presentation Mode */
.presentation-exit-bar { background: var(--accent-strong); padding: 0.7rem 0; }
.presentation-exit-bar .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.presentation-exit-bar .brand-text, .presentation-exit-bar .brand-mark { color: #fff; }
.presentation-exit-bar .btn-secondary { background: transparent; color: #fff; border-color: #fff; }
.presentation-exit-bar .btn-secondary:hover { background: rgba(255,255,255,0.12); }
.wrap-presentation { max-width: 56rem; }
body.presentation-active { font-size: 1.2rem; }
body.presentation-active h1 { font-size: 2.1rem; }
body.presentation-active h2 { font-size: 1.5rem; }
body.presentation-active .btn { padding: 0.85rem 1.5rem; font-size: 1.05rem; }
body.presentation-active .disclosure-card summary { font-size: 1.1rem; padding: 0.9rem 0; }
.presentation-mode .category-picker, .presentation-mode .case-picker { font-family: system-ui, sans-serif; margin-bottom: 1.2rem; }
.presentation-mode .category-picker a, .presentation-mode .case-picker a { margin: 0 0.2rem; }
.presentation-mode .case-picker a.is-current, .presentation-mode .category-picker strong { font-weight: 800; }

/* --- Responsive: tablet --------------------------------------------------- */
@media (max-width: 860px) {
  .primary-nav { order: 3; flex-basis: 100%; }
  .primary-nav ul { gap: 0.5rem 0.9rem; padding-top: 0.3rem; border-top: 1px solid var(--line-soft); margin-top: 0.4rem; }
  .primary-nav a { font-size: 0.88rem; }
  .site-search { order: 2; margin-left: 0; }
  .section-nav { position: static; }
  .filter-bar, .compare-selector { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 0.8rem; }
  .filter-field { flex: 0 0 auto; }
  .filter-field select { min-width: 8.5rem; }
  .filter-actions { margin-left: 0; flex-wrap: nowrap; }
}

/* --- Responsive: phones ---------------------------------------------------- */
@media (max-width: 640px) {
  h1 { font-size: 1.55rem; }
  .hero-panel { padding: 1.5rem 1.2rem; }
  .wrap, .wrap-narrow { padding: 0 1rem; }
  .compare-table, .compare-table tbody, .compare-table tr, .compare-table th, .compare-table td { display: block; width: 100%; }
  .compare-table tr { margin-bottom: 0.8rem; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
  .compare-table th { background: var(--panel-alt); }
  .data-table:not(.compare-table) thead { display: none; }
  .data-table:not(.compare-table) tr { display: block; margin-bottom: 0.8rem; border: 1px solid var(--line); border-radius: 8px; }
  .data-table:not(.compare-table) td { display: block; border: none; border-bottom: 1px solid var(--line); }
  .data-table:not(.compare-table) td::before { content: attr(data-label) ": "; font-weight: 700; font-family: system-ui, sans-serif; display: block; }
  .site-search { flex-wrap: wrap; }
  .site-search input { flex: 1 1 auto; min-width: 0; }
  .prevnext-nav .pn-next { text-align: left; }

  /* Filters: full-width stacked selects rather than a horizontal scroller
     at the narrowest widths, so they read as a normal short form. */
  .filter-bar, .compare-selector { flex-direction: column; align-items: stretch; overflow-x: visible; }
  .filter-field, .filter-field select { width: 100%; min-width: 0; }
  .filter-actions { margin-left: 0; width: 100%; }
  .filter-actions .btn { flex: 1 1 auto; }

  /* Answer options as comfortably tappable full-width cards */
  .answer-option { padding: 0.85rem 0.9rem; }
  .answer-option.compact { display: block; margin-right: 0; }

  /* Sticky/scrollspy section nav must not cover content it's sitting above */
  .section-nav-wrap { position: static; }
  .section-nav { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .section-nav a { white-space: nowrap; }

  /* Retrieval cards and their self-check controls */
  .retrieval-selfcheck { flex-direction: column; align-items: stretch; }
  .retrieval-selfcheck .btn { width: 100%; }

  /* Boundary Comparison selector stacks to one column (covered above by
     flex-direction: column) — reflection box and disclosures fit naturally
     since they are already full-width blocks. */

  /* Presentation mode keeps large, easy-to-hit controls on a classroom
     tablet or phone. */
  .presentation-exit-bar .wrap { flex-wrap: wrap; }
  body.presentation-active .btn { padding: 1rem 1.3rem; }

  /* Type F evidence controls: avoid cramped radio/legend rows */
  .evidence-card { padding: 0.8rem 0.85rem; }
  .evidence-card .answer-option { display: block; margin-right: 0; }
}

/* --- Reduced motion -------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* --- Print --------------------------------------------------------------- */
@media print {
  .site-header, .safety-banner, .preview-banner, .breadcrumbs, .site-footer, .site-search, .skip-link, .answer-form, form,
  .section-nav-wrap, .prevnext-nav, .nav-toggle,
  .filter-bar, .compare-selector, .continue-panel, .reflection-box, .type-chip-row, .search-clear,
  .presentation-exit-bar, .js-reveal-all, .disclosure-controls, .retrieval-selfcheck, .guided-step-nav,
  .return-to-top, .return-to-guided { display: none !important; }
  body { background: #fff; color: #000; }
  .revision-card, .compare-table { border: 1px solid #000; }
  .hero-panel { background: none; color: #000; border: 1px solid #000; }
  /* Printed pages can't run the JS "reveal all" — force every disclosure
     open so facilitator sheets, retrieval cards and comparison details
     print with their content visible rather than collapsed. */
  details { display: block !important; }
  details:not([open]) > *:not(summary) { display: block !important; }
  summary { list-style: none; font-weight: 700; }
  summary::-webkit-details-marker { display: none; }
}
.print-only-link button { font-family: system-ui, sans-serif; }
.print-fallback-hint { font-size: 0.85rem; color: var(--ink-soft); }