/* ============================================================
   Pharmacology in Action — stylesheet
   Editorial / clinical aesthetic: paper-and-ink, arterial-red accent.
   Per-class colour is injected at runtime as --class-accent.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:ital,wght@0,400;0,700;1,400;1,700&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --paper:        #F4F1EA;
  --paper-raised: #FBFAF6;
  --ink:          #1F1B16;
  --ink-soft:     #4A443B;
  --ink-faint:    #847C6E;
  --rule:         #D8D2C4;
  --rule-soft:    #E6E1D5;
  --arterial:     #B5231C;
  --arterial-dk:  #8A1A14;
  --correct:      #2E7A4F;
  --correct-bg:   #E4EFE6;
  --wrong:        #B5231C;
  --wrong-bg:     #F2E2E0;

  --class-accent: #C8472E; /* overridden per module/card at runtime */

  --serif: 'Atkinson Hyperlegible', 'Segoe UI', Arial, sans-serif;
  --mono:  'JetBrains Mono', 'SF Mono', Menlo, monospace;

  --maxw: 1080px;
  --radius: 3px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* faint paper grain */
  background-image:
    radial-gradient(circle at 20% 30%, rgba(0,0,0,0.014) 0%, transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(0,0,0,0.014) 0%, transparent 60%);
}

a { color: var(--arterial); }

/* ---------- Skip link (accessibility) ---------- */
.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 10px 16px; z-index: 999;
  font-family: var(--mono); font-size: 13px;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ---------- Layout shell ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }

/* ---------- Masthead ---------- */
.masthead {
  border-bottom: 2px solid var(--ink);
  padding: 28px 0 18px;
  margin-bottom: 4px;
}
.masthead-inner {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 20px; flex-wrap: wrap;
}
.masthead h1 {
  font-weight: 700; font-size: 28px; letter-spacing: -0.01em;
  cursor: pointer; line-height: 1.1;
}
.masthead h1 .em { color: var(--arterial); font-style: italic; }
.masthead .tagline {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-faint);
}

/* ---------- Library: controls ---------- */
.controls {
  display: flex; gap: 14px; flex-wrap: wrap; align-items: center;
  padding: 22px 0 18px;
}
.search-box {
  flex: 1 1 240px; position: relative;
}
.search-box input {
  width: 100%; font-family: var(--mono); font-size: 14px;
  padding: 11px 14px 11px 36px;
  border: 1px solid var(--rule); background: var(--paper-raised);
  border-radius: var(--radius); color: var(--ink);
}
.search-box input:focus {
  outline: 2px solid var(--arterial); outline-offset: -1px;
}
.search-box::before {
  content: "\01F50D"; position: absolute; left: 11px; top: 50%;
  transform: translateY(-50%); font-size: 13px; opacity: 0.5;
}
.filter-select {
  font-family: var(--mono); font-size: 13px;
  padding: 11px 14px; border: 1px solid var(--rule);
  background: var(--paper-raised); border-radius: var(--radius);
  color: var(--ink); cursor: pointer;
}
.filter-select:focus { outline: 2px solid var(--arterial); }

/* ---------- Library: progress strip ---------- */
.progress-strip {
  font-family: var(--mono); font-size: 12px; color: var(--ink-faint);
  letter-spacing: 0.04em; padding: 4px 0 18px;
  display: flex; align-items: center; gap: 12px;
}
.progress-track {
  flex: 1; height: 4px; background: var(--rule-soft);
  border-radius: 2px; overflow: hidden; max-width: 280px;
}
.progress-fill {
  height: 100%; background: var(--arterial); width: 0%;
  transition: width 0.5s ease;
}
.progress-reset {
  font-family: var(--mono); font-size: 11px; color: var(--ink-faint);
  background: none; border: none; cursor: pointer; text-decoration: underline;
  text-underline-offset: 2px; letter-spacing: 0.04em;
}
.progress-reset:hover { color: var(--arterial); }

/* ---------- Library: card grid ---------- */
.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
  gap: 18px; padding-bottom: 60px;
}
.card {
  position: relative; background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-top: 4px solid var(--class-accent);
  border-radius: var(--radius);
  padding: 20px 20px 18px; cursor: pointer;
  display: flex; flex-direction: column; gap: 9px;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
  min-height: 168px;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 22px rgba(31,27,22,0.10);
}
.card:focus-visible {
  outline: 2px solid var(--arterial); outline-offset: 2px;
}
.card .card-class {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.10em;
  text-transform: uppercase; color: var(--class-accent); font-weight: 700;
}
.card .card-name {
  font-size: 23px; font-weight: 700; line-height: 1.15;
  letter-spacing: -0.01em;
}
.card .card-aka {
  font-style: italic; color: var(--ink-faint); font-size: 15px;
  margin-top: -4px;
}
.card .card-pharm {
  font-size: 14px; color: var(--ink-soft); line-height: 1.4;
  margin-top: auto;
}
.card .card-foot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 10px; padding-top: 10px;
  border-top: 1px solid var(--rule-soft);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em;
}
.card .done-tick {
  color: var(--correct); font-weight: 700;
}
.card .card-cta { color: var(--ink-faint); }

/* in-development cards */
.card.dev {
  cursor: not-allowed; opacity: 0.62;
  border-top-color: var(--rule);
  background: repeating-linear-gradient(
    45deg, var(--paper-raised), var(--paper-raised) 9px,
    #EEEAE0 9px, #EEEAE0 18px);
}
.card.dev:hover { transform: none; box-shadow: none; }
.card.dev .card-class { color: var(--ink-faint); }
.card .dev-badge {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--ink-faint);
  border: 1px solid var(--rule); padding: 2px 7px; border-radius: 2px;
}

/* ---------- Module view ---------- */
.module-view { padding: 26px 0 80px; }

.breadcrumb {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em;
  background: none; border: none; cursor: pointer; color: var(--ink-faint);
  padding: 0; margin-bottom: 22px; text-transform: uppercase;
}
.breadcrumb:hover { color: var(--arterial); }

.module-head {
  border-left: 5px solid var(--class-accent);
  padding-left: 20px; margin-bottom: 30px;
}
.module-head .m-class {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--class-accent); font-weight: 700;
}
.module-head h2 {
  font-size: 40px; font-weight: 700; letter-spacing: -0.02em;
  line-height: 1.05; margin: 5px 0 2px;
}
.module-head .m-aka {
  font-style: italic; color: var(--ink-faint); font-size: 19px;
}
.module-head .m-pharm {
  font-size: 16px; color: var(--ink-soft); margin-top: 8px;
}
.module-head .m-agents {
  font-family: var(--mono); font-size: 12px; color: var(--ink-faint);
  margin-top: 6px; letter-spacing: 0.02em;
}

/* section scaffolding — accordion */
.section {
  margin-bottom: 14px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper-raised);
  overflow: hidden;
}
.section.is-open { border-color: var(--class-accent); }

/* the clickable header */
.section-label {
  width: 100%;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.10em;
  text-transform: uppercase; color: var(--ink-soft);
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px; margin: 0;
  background: var(--paper-raised); border: none;
  cursor: pointer; text-align: left;
  transition: background 0.14s ease;
}
.section-label:hover { background: var(--paper); }
.section-label:focus-visible {
  outline: 2px solid var(--arterial); outline-offset: -2px;
}
.section.is-open .section-label { color: var(--class-accent); }
.section-label .label-text { flex: 1; }

/* chevron */
.section-chevron {
  flex-shrink: 0; width: 12px; height: 12px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.2s ease;
}
.section.is-open .section-chevron {
  transform: rotate(-135deg) translate(-2px, -2px);
}

/* collapsible body */
.section-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.26s ease;
}
.section.is-open .section-body { grid-template-rows: 1fr; }
.section-body > .section-body-inner {
  overflow: hidden;
  min-height: 0;
}
.section-body-inner > * { margin: 0 20px; }
.section-body-inner > *:first-child { margin-top: 4px; }
.section-body-inner > *:last-child { margin-bottom: 22px; }

/* the knowledge-check header gets a touch more prominence
   so it is not overlooked while collapsed */
.section.section-quiz .section-label {
  background: color-mix(in srgb, var(--class-accent) 7%, var(--paper-raised));
}
.section.section-quiz.is-open .section-label {
  background: var(--paper-raised);
}

.section-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--class-accent); color: var(--paper-raised);
  font-size: 11px; font-weight: 700; flex-shrink: 0;
}
.section-num svg { width: 13px; height: 13px; display: block; }

.summary-text {
  font-size: 21px; line-height: 1.5; color: var(--ink-soft);
}

/* stepped script */
.steps { display: flex; flex-direction: column; gap: 2px; }
.step {
  display: flex; gap: 16px; padding: 14px 16px;
  background: var(--paper-raised); border: 1px solid var(--rule-soft);
  border-radius: var(--radius); align-items: flex-start;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease,
              box-shadow 0.2s ease;
}
.step:hover { border-color: var(--rule); }
.step .step-dot {
  flex-shrink: 0; font-family: var(--mono); font-size: 12px;
  font-weight: 700; color: var(--class-accent);
  border: 1.5px solid var(--class-accent); border-radius: 50%;
  width: 26px; height: 26px; display: flex;
  align-items: center; justify-content: center; margin-top: 2px;
  transition: background 0.2s ease, color 0.2s ease;
}
.step .step-text { font-size: 17px; line-height: 1.5; }

/* the step currently being narrated */
.step.step-active {
  background: color-mix(in srgb, var(--class-accent) 9%, var(--paper-raised));
  border-color: var(--class-accent);
  box-shadow: inset 3px 0 0 var(--class-accent);
}
.step.step-active .step-dot {
  background: var(--class-accent); color: var(--paper-raised);
}

/* ---------- step section controls (play + view toggle) ---------- */
.step-controls {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; margin-bottom: 14px;
}
.step-play {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em;
  cursor: pointer; background: var(--ink); color: var(--paper);
  border: none; border-radius: var(--radius); padding: 9px 16px;
  font-weight: 700;
}
.step-play[disabled] { opacity: 0.55; cursor: default; }
.step-play.is-pending {
  background: var(--paper-raised); color: var(--ink-faint);
  border: 1px dashed var(--rule); opacity: 1;
}
.view-toggle-group {
  display: inline-flex; border: 1px solid var(--rule);
  border-radius: var(--radius); overflow: hidden;
}
.view-toggle {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase; padding: 8px 16px; border: none;
  background: var(--paper-raised); color: var(--ink-faint); cursor: pointer;
}
.view-toggle.active { background: var(--ink); color: var(--paper); }

/* ---------- step image-sequence companion ---------- */
.step-images { display: flex; flex-direction: column; gap: 12px; }
.image-stage {
  border: 1px solid var(--rule-soft); border-radius: var(--radius);
  background: var(--paper-raised); min-height: 220px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.image-stage img { max-width: 100%; height: auto; display: block; }
.image-missing {
  font-family: var(--mono); font-size: 12px; color: var(--ink-faint);
  padding: 60px 20px; text-align: center;
}
.image-caption {
  font-size: 15px; line-height: 1.5; color: var(--ink-soft);
  border-left: 3px solid var(--class-accent); padding-left: 12px;
}


/* written text block */
.prose {
  background: var(--paper-raised); border: 1px solid var(--rule-soft);
  border-left: 3px solid var(--rule); border-radius: var(--radius);
  padding: 22px 26px; font-size: 18px; line-height: 1.7;
}

/* plain-language toggle */
.register-toggle {
  display: inline-flex; border: 1px solid var(--rule);
  border-radius: var(--radius); overflow: hidden; margin-bottom: 14px;
}
.register-toggle button {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase; padding: 7px 14px; border: none;
  background: var(--paper-raised); color: var(--ink-faint); cursor: pointer;
}
.register-toggle button.active {
  background: var(--ink); color: var(--paper);
}

/* discipline notes */
.discipline-tabs {
  display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: -1px;
}
.discipline-tabs button {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em;
  padding: 9px 15px; border: 1px solid var(--rule-soft);
  border-bottom: none; background: var(--paper);
  color: var(--ink-faint); cursor: pointer;
  border-radius: var(--radius) var(--radius) 0 0;
}
.discipline-tabs button.active {
  background: var(--paper-raised); color: var(--class-accent);
  font-weight: 700; border-color: var(--rule);
}
.discipline-panel {
  background: var(--paper-raised); border: 1px solid var(--rule);
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  padding: 20px 24px; font-size: 17px; line-height: 1.65;
}
.discipline-disclaimer {
  font-family: var(--mono); font-size: 11px; color: var(--ink-faint);
  margin-top: 12px; line-height: 1.5; font-style: normal;
}

/* callout */
.callout {
  border: 1px dashed var(--class-accent);
  background: color-mix(in srgb, var(--class-accent) 6%, var(--paper-raised));
  border-radius: var(--radius); padding: 18px 22px;
}
.callout .callout-tag {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--class-accent);
  font-weight: 700; display: block; margin-bottom: 6px;
}
.callout p { font-size: 16px; line-height: 1.6; }

/* ---------- Quiz ---------- */
.quiz-q {
  background: var(--paper-raised); border: 1px solid var(--rule-soft);
  border-radius: var(--radius); padding: 22px 24px; margin-bottom: 16px;
}
.quiz-q .q-num {
  font-family: var(--mono); font-size: 12px; color: var(--ink-faint);
  letter-spacing: 0.06em;
}
.quiz-q .q-text {
  font-size: 19px; font-weight: 700; margin: 6px 0 16px; line-height: 1.4;
}
.quiz-options { display: flex; flex-direction: column; gap: 8px; }
.quiz-opt {
  text-align: left; font-family: var(--serif); font-size: 16.5px;
  padding: 12px 16px; border: 1px solid var(--rule);
  background: var(--paper); border-radius: var(--radius);
  cursor: pointer; display: flex; gap: 12px; align-items: flex-start;
  line-height: 1.45; transition: border-color 0.12s, background 0.12s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--ink-soft); }
.quiz-opt:focus-visible { outline: 2px solid var(--arterial); outline-offset: 1px; }
.quiz-opt .opt-letter {
  font-family: var(--mono); font-size: 13px; font-weight: 700;
  color: var(--ink-faint); flex-shrink: 0;
}
.quiz-opt:disabled { cursor: default; }
.quiz-opt.chosen-correct {
  background: var(--correct-bg); border-color: var(--correct);
}
.quiz-opt.chosen-correct .opt-letter { color: var(--correct); }
.quiz-opt.chosen-wrong {
  background: var(--wrong-bg); border-color: var(--wrong);
}
.quiz-opt.chosen-wrong .opt-letter { color: var(--wrong); }
.quiz-opt.reveal-correct {
  border-color: var(--correct); border-width: 2px;
}
.quiz-feedback {
  margin-top: 14px; padding: 14px 16px; border-radius: var(--radius);
  font-size: 16px; line-height: 1.6; display: none;
}
.quiz-feedback.show { display: block; }
.quiz-feedback.ok { background: var(--correct-bg); }
.quiz-feedback.no { background: var(--wrong-bg); }
.quiz-feedback .fb-verdict {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em;
  text-transform: uppercase; font-weight: 700; display: block;
  margin-bottom: 5px;
}
.quiz-feedback.ok .fb-verdict { color: var(--correct); }
.quiz-feedback.no .fb-verdict { color: var(--wrong); }

.quiz-score {
  font-family: var(--mono); font-size: 13px; color: var(--ink-soft);
  background: var(--paper-raised); border: 1px solid var(--rule);
  border-radius: var(--radius); padding: 14px 18px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 10px;
}
.quiz-score .retry {
  font-family: var(--mono); font-size: 12px; cursor: pointer;
  background: var(--ink); color: var(--paper); border: none;
  padding: 7px 13px; border-radius: 2px;
}
.recall-note {
  font-family: var(--mono); font-size: 11.5px; color: var(--arterial);
  margin-top: 8px; line-height: 1.5;
}

/* ---------- References ---------- */
.refs { list-style: none; counter-reset: ref; }
.refs li {
  counter-increment: ref; padding: 9px 0 9px 34px;
  border-bottom: 1px solid var(--rule-soft); position: relative;
  font-size: 15.5px; color: var(--ink-soft); line-height: 1.5;
}
.refs li::before {
  content: counter(ref); position: absolute; left: 0; top: 9px;
  font-family: var(--mono); font-size: 12px; font-weight: 700;
  color: var(--ink-faint);
}

/* ---------- Footer ---------- */
.site-foot {
  border-top: 2px solid var(--ink); margin-top: 40px;
  padding: 22px 0 50px; font-family: var(--mono);
  font-size: 11px; color: var(--ink-faint); letter-spacing: 0.04em;
  line-height: 1.7;
}

/* ---------- Page-load reveal ---------- */
.reveal {
  opacity: 0; transform: translateY(10px);
  animation: rise 0.5s ease forwards;
}
@keyframes rise { to { opacity: 1; transform: translateY(0); } }

/* ---------- Responsive ---------- */
@media (max-width: 620px) {
  body { font-size: 17px; }
  .module-head h2 { font-size: 33px; }
  .wrap { padding: 0 18px; }
  .masthead h1 { font-size: 24px; }
  .grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { animation: none; opacity: 1; transform: none; }
  .card:hover { transform: none; }
  html { scroll-behavior: auto; }
}