/* ============================================================
   Healthcare AI Learning Hub — Shared Styles
   AEO-optimized, content-first, mobile-responsive
   ============================================================ */

.academy-body {
  --teal-900: #134E4A;
  --teal-700: #0F766E;
  --teal-600: #0D9488;
  --teal-100: #CCFBF1;
  --teal-50:  #F0FDFA;

  --amber-700: #B45309;
  --amber-100: #FEF3C7;
  --amber-50:  #FFFBEB;

  --rose-700:  #BE123C;
  --rose-50:   #FFF1F2;

  --bg:        #FAFAF9;
  --card:      #FFFFFF;
  --border:    #E7E5E4;
  --border-strong: #D6D3D1;

  --ink:       #1C1917;
  --ink-2:     #44403C;
  --ink-3:     #78716C;

  --code-bg:   #F5F5F4;

  --maxw:      1180px;
  --content-w: 760px;

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(28,25,23,0.04);
  --shadow-md: 0 4px 12px rgba(28,25,23,0.06);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

.academy-body body, .academy-body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'IBM Plex Serif', Georgia, 'Times New Roman', serif;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--teal-900);
  line-height: 1.2;
  margin: 0 0 0.5em;
}

h1 { font-size: 2.4rem; line-height: 1.15; letter-spacing: -0.025em; }
h2 { font-size: 1.7rem; margin-top: 2.2em; }
h3 { font-size: 1.25rem; margin-top: 1.8em; color: var(--ink); }
h4 { font-size: 1.05rem; margin-top: 1.4em; color: var(--ink); }

p { margin: 0 0 1.1em; }

a { color: var(--teal-700); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--teal-900); }

code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.92em;
  color: var(--ink);
}

ul, ol { padding-left: 1.4em; margin: 0 0 1.2em; }
li { margin-bottom: 0.4em; }

strong { color: var(--teal-900); font-weight: 600; }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.5em 0;
}

/* ===== Top Nav ===== */
.topnav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: rgba(255,255,255,0.9);
}
.topnav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.topnav-logo {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--teal-900);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.topnav-logo .dot { color: var(--amber-700); }
.topnav-links { display: flex; gap: 20px; align-items: center; font-size: 0.94rem; }
.topnav-links a { color: var(--ink-2); text-decoration: none; font-weight: 500; }
.topnav-links a:hover { color: var(--teal-700); }
.topnav-links a.active { color: var(--teal-700); }

/* ===== Breadcrumb ===== */
.crumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 24px 0;
  font-size: 0.88rem;
  color: var(--ink-3);
}
.crumb a { color: var(--ink-3); text-decoration: none; }
.crumb a:hover { color: var(--teal-700); }
.crumb .sep { margin: 0 8px; color: var(--border-strong); }

/* ===== Page Header (article) ===== */
.page-header {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 28px 24px 8px;
}
.page-header .eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal-700);
  margin-bottom: 10px;
}
.page-header h1 { margin-bottom: 14px; }
.page-header .lede {
  font-size: 1.18rem;
  color: var(--ink-2);
  line-height: 1.55;
  margin-bottom: 18px;
}
.meta-row {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--ink-3);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border);
}
.meta-row span::before { content: "•"; margin-right: 10px; color: var(--border-strong); }
.meta-row span:first-child::before { content: none; margin-right: 0; }

/* ===== TL;DR / Answer Box ===== */
.tldr {
  max-width: var(--content-w);
  margin: 28px auto;
  padding: 22px 26px;
  background: var(--teal-50);
  border-left: 4px solid var(--teal-700);
  border-radius: var(--r-md);
}
.tldr-label {
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal-700);
  margin-bottom: 8px;
}
.tldr p { margin-bottom: 0; font-size: 1.05rem; color: var(--ink); }
.tldr p + p { margin-top: 0.7em; }

/* ===== Article Content ===== */
article.content {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 0 24px 60px;
}

article.content h2 {
  padding-top: 0.4em;
  border-top: 1px solid var(--border);
  margin-top: 2.5em;
}

article.content h2:first-of-type { border-top: none; padding-top: 0; }

/* ===== Callouts ===== */
.callout {
  margin: 1.8em 0;
  padding: 18px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: var(--card);
}
.callout-title {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.callout p:last-child { margin-bottom: 0; }
.callout ul:last-child, .callout ol:last-child { margin-bottom: 0; }

.callout.example {
  background: var(--amber-50);
  border-color: #FDE68A;
}
.callout.example .callout-title { color: var(--amber-700); }

.callout.warning {
  background: var(--rose-50);
  border-color: #FECDD3;
}
.callout.warning .callout-title { color: var(--rose-700); }

.callout.key {
  background: var(--teal-50);
  border-color: #99F6E4;
}
.callout.key .callout-title { color: var(--teal-700); }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; margin: 1.6em 0; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
}
th, td {
  text-align: left;
  padding: 11px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th {
  background: #FAFAF9;
  font-weight: 600;
  color: var(--teal-900);
  font-size: 0.88rem;
  letter-spacing: 0.01em;
}
tr:last-child td { border-bottom: none; }
td code { background: #F5F5F4; }

/* ===== Self-check (placeholder for quizzes) ===== */
.selfcheck {
  margin: 2em 0;
  padding: 20px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.selfcheck-label {
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber-700);
  margin-bottom: 10px;
}
.selfcheck details {
  margin: 10px 0;
  padding: 10px 14px;
  border-radius: var(--r-sm);
  background: #FAFAF9;
  border: 1px solid var(--border);
}
.selfcheck summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--ink);
  list-style: none;
  padding: 2px 0;
  outline: none;
}
.selfcheck summary::-webkit-details-marker { display: none; }
.selfcheck summary::before {
  content: "Q: ";
  font-weight: 700;
  color: var(--teal-700);
}
.selfcheck details[open] summary { margin-bottom: 8px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.selfcheck .answer { color: var(--ink-2); font-size: 0.97rem; }
.selfcheck .answer::before { content: "A: "; font-weight: 700; color: var(--teal-700); }

/* ===== Glossary ===== */
.glossary {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 22px 26px;
  margin: 2em 0;
}
.glossary h3 { margin-top: 0; }
.glossary dl { margin: 0; }
.glossary dt {
  font-weight: 600;
  color: var(--teal-900);
  margin-top: 14px;
  font-size: 0.97rem;
}
.glossary dt:first-child { margin-top: 0; }
.glossary dd {
  margin: 4px 0 0;
  color: var(--ink-2);
  font-size: 0.95rem;
}

/* ===== FAQ ===== */
.faq {
  margin: 2.5em 0;
}
.faq h2 { margin-top: 0; }
.faq-item {
  border-top: 1px solid var(--border);
  padding: 18px 0;
}
.faq-item:last-child { border-bottom: 1px solid var(--border); }
.faq-item h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 8px;
}
.faq-item p:last-child { margin-bottom: 0; }

/* ===== Step / Module Cards (track index) ===== */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 28px 0;
}
@media (min-width: 720px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
.card {
  display: block;
  padding: 24px 24px 22px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.card:hover {
  border-color: var(--teal-600);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.card-step {
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber-700);
  margin-bottom: 8px;
}
.card-title {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--teal-900);
  line-height: 1.25;
  margin-bottom: 10px;
}
.card p { font-size: 0.95rem; color: var(--ink-2); margin-bottom: 12px; }
.card-meta { font-size: 0.82rem; color: var(--ink-3); }

/* ===== Hero (home) ===== */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 60px 24px 30px;
  text-align: left;
}
.hero h1 {
  font-size: 3rem;
  letter-spacing: -0.03em;
  line-height: 1.05;
  max-width: 18ch;
}
.hero .lede {
  font-size: 1.25rem;
  color: var(--ink-2);
  margin: 18px 0 28px;
  max-width: 58ch;
  line-height: 1.55;
}
.hero-stat-row {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
  padding-top: 30px;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}
.hero-stat .num {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--teal-700);
  line-height: 1;
}
.hero-stat .label {
  font-size: 0.85rem;
  color: var(--ink-3);
  margin-top: 6px;
}

/* ===== Two-track section (home) ===== */
.tracks {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 30px 24px 60px;
}
.tracks-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}
@media (min-width: 820px) {
  .tracks-grid { grid-template-columns: repeat(2, 1fr); }
}
.track-card {
  padding: 32px 30px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}
.track-card.builders { border-top: 4px solid var(--teal-700); }
.track-card.client-engagement { border-top: 4px solid var(--amber-700); }
.track-card .who {
  font-family: 'Inter', sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 10px;
}
.track-card.builders .who { color: var(--teal-700); }
.track-card.client-engagement .who { color: var(--amber-700); }
.track-card h2 {
  margin-top: 0;
  font-size: 1.6rem;
  border-top: none;
  padding-top: 0;
}
.track-card p { color: var(--ink-2); font-size: 1rem; }
.track-card ul { font-size: 0.95rem; color: var(--ink-2); }
.track-card .cta {
  margin-top: auto;
  padding-top: 18px;
  font-weight: 600;
  color: var(--teal-700);
}
.track-card.client-engagement .cta { color: var(--amber-700); }
.track-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* ===== Prev / Next nav ===== */
.prevnext {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 50px auto 0;
  max-width: var(--content-w);
  padding: 0 24px;
}
.prevnext a {
  display: block;
  padding: 18px 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s;
}
.prevnext a:hover { border-color: var(--teal-600); }
.prevnext .dir {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 6px;
  font-weight: 600;
}
.prevnext .ttl {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.05rem;
  color: var(--teal-900);
  font-weight: 600;
}
.prevnext .next { text-align: right; }
.prevnext .empty { background: transparent; border-color: transparent; }

/* ===== Quiz placeholder ===== */
.quiz-placeholder {
  margin: 2.5em 0 1em;
  padding: 24px 28px;
  background: var(--amber-50);
  border: 1px dashed var(--amber-700);
  border-radius: var(--r-md);
  text-align: center;
}
.quiz-placeholder .label {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber-700);
  margin-bottom: 8px;
}
.quiz-placeholder .title {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.2rem;
  color: var(--teal-900);
  margin-bottom: 6px;
}
.quiz-placeholder .desc { font-size: 0.93rem; color: var(--ink-2); margin: 0; }

/* ===== Footer ===== */
footer.site {
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 36px 24px;
  text-align: center;
  font-size: 0.88rem;
  color: var(--ink-3);
  margin-top: 60px;
}
footer.site a { color: var(--ink-3); }

/* ===== Mobile tweaks ===== */
@media (max-width: 640px) {
  body { font-size: 16px; }
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.4rem; }
  .hero { padding: 36px 20px 20px; }
  .hero h1 { font-size: 2.1rem; }
  .hero .lede { font-size: 1.05rem; }
  .topnav-links { gap: 14px; font-size: 0.88rem; }
  .topnav-links a:not(.active):not(.home) { display: none; }
}