/* Trust Agent reading template (Codex release reading-design-v1, integrated by the domain session).
   Loaded on course pages only. Everything is scoped under .course--reader so nothing leaks to other pages.
   A dark editorial header, then an opaque cream reading surface (about 66 characters wide) with a compact section rail.
   No parallax, no delayed reveal and no sticky bar sits behind a lesson. Focus rings are ink on cream and gold on dark
   (the brand has no blue). */
.course--reader {
  --rd-paper: #f6f5f1; --rd-ink: #14140f; --rd-muted: #5b6167; --rd-bronze: #7f6714;
  --rd-line: #d9d6cc; --rd-panel: #eeece4; --rd-code: #111110; --rd-cream: #f4f2ec;
}
.course--reader .rd-mono, .course--reader .rd-eyebrow { font-family: var(--mono); font-size: .7rem; line-height: 1.6; letter-spacing: .11em; text-transform: uppercase; }
.course--reader .rd-eyebrow { color: var(--rd-bronze); margin: 0 0 1.2rem; }

/* ---- dark editorial header */
.course--reader .rd-hero { background: var(--void); color: var(--rd-cream); padding: calc(var(--nav-h) + 28px) 0 64px; }
.course--reader .rd-hero .crumbs ol { margin-bottom: 40px; }
.course--reader .rd-hero__grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center; }
.course--reader .rd-hero .rd-eyebrow { color: var(--gold); }
.course--reader .rd-hero h1 { font: 600 clamp(2.35rem, 4.2vw, 4.2rem)/1.08 var(--display); letter-spacing: -.025em; margin: 0; max-width: 18ch; color: var(--rd-cream); }
.course--reader .rd-deck { font-size: 1.08rem; line-height: 1.65; color: #c4c3ba; max-width: 57ch; margin: 24px 0 0; }
.course--reader .rd-hero .author-line { margin: 22px 0 0; font-size: .85rem; color: #c4c3ba; }
.course--reader .rd-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 25px; list-style: none; padding: 0; margin: 26px 0 0; font-size: .8rem; color: #c4c3ba; }
.course--reader .rd-meta li + li::before { content: "·"; margin-right: 25px; color: var(--gold); }
.course--reader .rd-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.course--reader .rd-cover { margin: 0; border: 1px solid #343128; background: #080807; }
.course--reader .rd-cover img { display: block; width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: cover; }
.course--reader .rd-cover figcaption { display: flex; justify-content: space-between; gap: 12px; padding: 16px 22px; border-top: 1px solid #343128; color: #b9b7ad; font: 500 .65rem/1.5 var(--mono); letter-spacing: .11em; text-transform: uppercase; }
.course--reader .rd-emblem { display: grid; justify-items: center; gap: 12px; }
.course--reader .rd-emblem__lvl { font: 500 .66rem/1 var(--mono); letter-spacing: .22em; text-transform: uppercase; color: var(--muted); margin: 0; }

/* ---- the reading surface */
.course--reader .rd-surface { background: var(--rd-paper); color: var(--rd-ink); color-scheme: light; }
.course--reader .rd-grid { display: grid; grid-template-columns: 228px minmax(0, 1fr); gap: 80px; align-items: start; padding-block: 64px 80px; }
.course--reader .rd-surface :focus-visible { outline: 3px solid var(--rd-ink); outline-offset: 4px; border-radius: 2px; }
.course--reader .rd-code :focus-visible, .course--reader .rd-copy:focus-visible { outline-color: var(--gold-pale); outline-offset: -3px; }
.course--reader .rd-rail { position: sticky; top: calc(var(--nav-h) + 24px); font-size: .85rem; }
.course--reader .rd-rail .rd-eyebrow { margin-bottom: 16px; }
.course--reader .rd-rail nav { display: grid; gap: 12px; padding-bottom: 24px; border-bottom: 1px solid var(--rd-line); }
.course--reader .rd-rail nav a { padding: 3px 0; color: var(--rd-ink); text-decoration: none; }
.course--reader .rd-rail nav a:hover { text-decoration: underline; text-underline-offset: .22em; }
.course--reader .rd-rail__note { font-size: .75rem; line-height: 1.6; color: var(--rd-muted); margin: 20px 0 0; }

.course--reader .rd-reader { min-width: 0; max-width: 66ch; font-size: 1.08rem; line-height: 1.75; color: var(--rd-ink); }
.course--reader .rd-reader > section + section { margin-top: 64px; padding-top: 48px; border-top: 1px solid var(--rd-line); }
.course--reader .rd-reader h2 { font: 600 clamp(1.8rem, 3vw, 2.6rem)/1.12 var(--display); letter-spacing: -.025em; margin: 0; color: var(--rd-ink); }
.course--reader .rd-reader h3 { font: 600 1.45rem/1.15 var(--display); letter-spacing: -.02em; margin: 0; color: var(--rd-ink); }
.course--reader .rd-reader p { margin: 0; }
.course--reader .rd-reader p + p { margin-top: 1.1em; }
.course--reader .rd-reader h2 + p, .course--reader .rd-reader h3 + p { margin-top: 24px; }
.course--reader .rd-reader a { color: var(--rd-ink); text-underline-offset: .22em; overflow-wrap: anywhere; }
.course--reader .rd-reader ul, .course--reader .rd-reader ol { padding-left: 1.4em; margin: 0; }
.course--reader .rd-reader li + li { margin-top: .55em; }
.course--reader .rd-answer-lead { font-size: 1.22rem; line-height: 1.7; }
.course--reader .rd-outcomes { margin-top: 32px; }
.course--reader .rd-outcomes h3 { font-size: 1.25rem; margin-bottom: 16px; }
.course--reader .rd-outcomes h3:not(:first-child) { margin-top: 32px; }
.course--reader .rd-heading { display: flex; gap: 20px; align-items: baseline; margin-bottom: 24px; }
.course--reader .rd-num { font: 500 .78rem/1 var(--mono); color: var(--rd-bronze); }
.course--reader .rd-chapter-intro { font-size: 1.18rem; color: var(--rd-muted); margin-bottom: 28px !important; }
.course--reader .rd-reader .rd-lesson > * + * { margin-top: 24px; }
.course--reader .rd-reader code, .course--reader .rd-reader kbd { font-family: var(--mono); font-size: .84em; background: #eae7dc; border: 1px solid #ddd8c9; padding: .1em .28em; border-radius: 2px; overflow-wrap: anywhere; color: var(--rd-ink); }

/* ---- code */
.course--reader .rd-code { margin: 0; background: var(--rd-code); color: var(--rd-cream); border: 1px solid #3d3a31; border-radius: 2px; max-width: 100%; overflow: hidden; }
.course--reader .rd-code__bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 10px 20px; border-bottom: 1px solid #37362f; color: #ccc6b3; min-height: 48px; }
.course--reader .rd-copy { font: 500 .74rem/1.4 var(--sans); min-height: 36px; border: 1px solid #82754c; border-radius: 2px; background: transparent; color: var(--rd-cream); padding: 7px 11px; cursor: pointer; }
.course--reader .rd-copy:hover { background: #343025; }
.course--reader .rd-code pre { margin: 0; padding: 22px; max-width: 100%; overflow-x: auto; tab-size: 4; white-space: pre; font: 400 .79rem/1.8 var(--mono); font-variant-ligatures: none; color: var(--rd-cream); }
.course--reader .rd-reader .rd-code code { font: inherit; white-space: inherit; padding: 0; border: 0; background: none; color: inherit; overflow-wrap: normal; }
.course--reader .rd-copy-note { font-size: .72rem !important; line-height: 1.5; padding: 0 20px 14px; color: #e4d197; margin: 0 !important; }
.course--reader .rd-copy-note:empty { padding: 0; }

/* ---- tables */
.course--reader .rd-table-hint { display: none; font-size: .75rem; color: var(--rd-muted); margin: 20px 0 -12px !important; }
.course--reader .rd-table { overflow-x: auto; max-width: 100%; border-bottom: 1px solid var(--rd-line); }
.course--reader .rd-table table { width: 100%; min-width: 32rem; border-collapse: collapse; font-size: .88rem; line-height: 1.55; }
.course--reader .rd-table caption { text-align: left; font: 500 .67rem/1.5 var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--rd-bronze); margin-bottom: 15px; }
.course--reader .rd-table th, .course--reader .rd-table td { text-align: left; vertical-align: top; padding: 14px 16px; border-top: 1px solid var(--rd-line); }
.course--reader .rd-table thead th { color: var(--rd-bronze); font-size: .78rem; border-top: 2px solid var(--rd-ink); }
.course--reader .rd-table tbody th { font-weight: 500; }
.course--reader .rd-table tbody tr:nth-child(even) { background: #eeece4; }

/* ---- callouts, exercises, answers */
.course--reader .rd-callout { border-left: 3px solid var(--rd-bronze); padding: 22px 24px; background: var(--rd-panel); }
.course--reader .rd-callout h3 { font: 600 .95rem/1.4 var(--sans); letter-spacing: 0; margin-bottom: 10px; }
.course--reader .rd-callout p { font-size: .96rem; }
.course--reader .rd-callout h3 + p { margin-top: 0 !important; }
.course--reader .rd-exercise { border: 1px solid #b8a775; background: #fffef9; padding: 30px; }
.course--reader .rd-exercise__head { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; }
.course--reader .rd-exercise__head .rd-eyebrow { margin-bottom: 12px; }
.course--reader .rd-exercise h3 { line-height: 1.3; }
.course--reader .rd-exercise p { margin-top: 20px; }
.course--reader .rd-exercise ol { margin-top: 20px; }
.course--reader .rd-reflect { color: var(--rd-muted); font-size: .95rem; }
.course--reader .rd-answer { margin-top: 24px; border-top: 1px solid #c9bea2; padding-top: 8px; }
.course--reader .rd-answer summary { font-size: .95rem; font-weight: 600; cursor: pointer; padding: 12px 0; min-height: 44px; }
.course--reader .rd-answer[open] summary { color: var(--rd-bronze); }
.course--reader .rd-answer__body { padding-top: 4px; font-size: 1rem; }
.course--reader .rd-answer__body p { margin-top: 0; }
.course--reader .rd-answer__body p + p { margin-top: 1em; }

/* ---- workbook list, questions, glossary, sources */
.course--reader .rd-workbook { list-style: none; padding: 0 !important; margin: 28px 0; }
.course--reader .rd-workbook li { display: grid; grid-template-columns: 28px 1fr auto; gap: 14px; align-items: start; border-bottom: 1px solid var(--rd-line); padding: 15px 0; margin: 0 !important; font-size: .95rem; }
.course--reader .rd-workbook .rd-mono { color: var(--rd-bronze); }
.course--reader .rd-workbook small { font: 400 .72rem/1.4 var(--sans); color: var(--rd-muted); }
.course--reader .rd-chintro { margin: 6px 0 0 !important; font-size: .86rem; line-height: 1.55; color: var(--rd-muted); }
.course--reader .rd-also { font-size: .95rem; color: var(--rd-muted); margin-top: 0; }
.course--reader .rd-dl-note { font-size: .85rem; color: var(--rd-muted); margin-top: 14px !important; }
.course--reader .rd-qa { border-top: 1px solid var(--rd-line); margin-top: 28px; }
.course--reader .rd-qa .faq__item { border-bottom: 1px solid var(--rd-line); }
.course--reader .rd-qa .faq__item summary { padding: 18px 2px; }
.course--reader .rd-qa .faq__q { font: 600 1.12rem/1.4 var(--display); color: var(--rd-ink); }
.course--reader .rd-qa .faq__item summary:hover .faq__q { color: var(--rd-bronze); }
.course--reader .rd-qa .faq__icon { box-shadow: inset 0 0 0 1px var(--rd-bronze); }
.course--reader .rd-qa .faq__icon::before, .course--reader .rd-qa .faq__icon::after { background: var(--rd-bronze); }
.course--reader .rd-qa .faq__item[open] .faq__icon { background: rgba(127, 103, 20, .1); }
.course--reader .rd-qa .faq__a { color: var(--rd-ink); padding: 0 2px 22px; font-size: 1rem; }
.course--reader .rd-gloss { display: grid; gap: 0; margin: 28px 0 0; border-top: 1px solid var(--rd-line); }
.course--reader .rd-gloss div { padding: 14px 0; border-bottom: 1px solid var(--rd-line); }
.course--reader .rd-gloss dt { font: 600 1rem/1.4 var(--sans); color: var(--rd-ink); margin: 0 0 4px; }
.course--reader .rd-gloss dd { margin: 0; font-size: .95rem; color: var(--rd-muted); line-height: 1.6; }
.course--reader .rd-environment { font-size: .85rem; color: var(--rd-muted); margin-top: 24px; }
.course--reader .rd-sources { font-size: .88rem; padding-left: 1.1em; margin-top: 24px !important; }
.course--reader .rd-sources li { padding-left: .5em; margin-bottom: 16px; }
.course--reader .rd-sources span { display: block; color: var(--rd-muted); font-size: .78rem; }
.course--reader .rd-credit { font-size: .85rem; color: var(--rd-muted); margin-top: 28px !important; }

/* ---- dark next-steps band keeps the site's own card styling */
.course--reader .next { background: var(--void); }

@media (max-width: 1000px) {
  .course--reader .rd-grid { gap: 40px; grid-template-columns: 190px minmax(0, 1fr); }
  .course--reader .rd-hero__grid { gap: 24px; grid-template-columns: 1.25fr 1fr; }
  .course--reader .rd-reader { font-size: 1.02rem; }
  .course--reader .rd-cover figcaption { display: block; }
  .course--reader .rd-cover figcaption span { display: block; }
}
@media (max-width: 760px) {
  .course--reader .rd-hero { padding-bottom: 40px; }
  .course--reader .rd-hero .crumbs ol { margin-bottom: 28px; }
  .course--reader .rd-hero__grid { display: flex; flex-direction: column; align-items: stretch; gap: 36px; }
  .course--reader .rd-hero h1 { font-size: clamp(2.25rem, 7.7vw, 3.3rem); }
  .course--reader .rd-deck { font-size: 1rem; }
  .course--reader .rd-cover img { width: 100%; height: auto; aspect-ratio: 3 / 2; object-fit: contain; }   /* the authored 3:2 art is never cropped on phones */
  .course--reader .rd-cover figcaption { display: flex; font-size: .62rem; }
  .course--reader .rd-meta { gap: 6px 18px; }
  .course--reader .rd-meta li + li::before { display: none; }
  .course--reader .rd-actions .btn { flex: 1 1 100%; }
  .course--reader .rd-actions .dl-size { white-space: nowrap; }
  .course--reader .rd-grid { display: block; padding-block: 32px 56px; }
  .course--reader .rd-rail { position: static; margin-bottom: 36px; }
  .course--reader .rd-rail nav { display: flex; flex-wrap: wrap; gap: 10px 22px; }
  .course--reader .rd-rail__note { display: none; }
  .course--reader .rd-reader > section + section { margin-top: 44px; padding-top: 36px; }
  .course--reader .rd-reader { font-size: 1rem; }
  .course--reader .rd-exercise { padding: 22px 18px; }
  .course--reader .rd-exercise__head { display: block; }
  .course--reader .rd-exercise__head .rd-mono { display: block; margin-bottom: 5px; }
  .course--reader .rd-code__bar { padding: 8px 14px; }
  .course--reader .rd-code pre { padding: 16px; font-size: .73rem; }
  .course--reader .rd-heading { gap: 14px; }
  .course--reader .rd-workbook li { grid-template-columns: 24px 1fr; gap: 10px; }
  .course--reader .rd-workbook small { grid-column: 2; }
  .course--reader .rd-table table { min-width: 30rem; }
  .course--reader .rd-table-hint { display: block; }
  .course--reader .rd-answer-lead { font-size: 1.1rem; }
}
/* ---- self-check: score yourself on the questions (optional, needs JavaScript; nothing is stored or sent) */
.course--reader .rd-sc-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 24px; margin: 18px 0 4px; padding: 16px 18px; border: 1px solid var(--rd-line); background: rgba(255, 255, 255, .55); }
.course--reader .rd-sc-bar p { margin: 0; flex: 1 1 22rem; color: var(--rd-muted); font-size: .96rem; }
.course--reader .rd-sc-btn { min-height: 44px; padding: 10px 20px; font: 600 .95rem/1.2 var(--sans); color: var(--rd-ink); background: transparent; border: 1px solid var(--rd-ink); border-radius: 2px; cursor: pointer; }
.course--reader .rd-sc-btn:hover { background: rgba(20, 20, 15, .06); }
.course--reader .rd-sc-btn:focus-visible, .course--reader .rd-sc-link:focus-visible { outline: 3px solid var(--rd-ink); outline-offset: 3px; }
.course--reader .rd-sc-btn--primary { background: var(--rd-ink); color: #f6f5f1; }
.course--reader .rd-sc-btn--primary:hover { background: #2a2a22; }
.course--reader .rd-sc { margin: 18px 0 4px; }
.course--reader .rd-sc-card { padding: 26px clamp(18px, 4vw, 34px); border: 1px solid var(--rd-line); border-left: 3px solid var(--rd-bronze); background: #fff; outline: none; }
.course--reader .rd-sc-count { margin: 0 0 8px; font: 500 .72rem/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--rd-bronze); }
.course--reader .rd-sc-q, .course--reader .rd-sc-score { margin: 0 0 18px; font: 600 1.35rem/1.35 var(--display); color: var(--rd-ink); outline: none; }
.course--reader .rd-sc-answer { margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--rd-line); outline: none; }
.course--reader .rd-sc-answer p { margin: 0 0 14px; }
.course--reader .rd-sc-ask { font-weight: 600; }
.course--reader .rd-sc-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.course--reader .rd-sc-link { margin-top: 20px; padding: 6px 0; background: none; border: 0; color: var(--rd-muted); font: 500 .9rem/1.3 var(--sans); text-decoration: underline; cursor: pointer; }
.course--reader .rd-sc-revisit { margin: 8px 0 0; padding-left: 1.2rem; }
.course--reader .rd-sc-revisit li { margin: 6px 0; }
.course--reader .rd-sc-revisit a { color: var(--rd-ink); }
@media (prefers-reduced-motion: reduce) {
  .course--reader *, .course--reader *::before, .course--reader *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
@media print {
  .course--reader .rd-sc-bar, .course--reader .rd-sc { display: none !important; }
  .course--reader .rd-rail, .course--reader .rd-actions, .course--reader .rd-copy, .course--reader .rd-cover, .course--reader .rd-emblem { display: none !important; }
  .course--reader .rd-hero { background: #fff; color: #14140f; padding: 0 0 20px; }
  .course--reader .rd-hero h1, .course--reader .rd-deck, .course--reader .rd-hero .author-line, .course--reader .rd-meta { color: #14140f; }
  .course--reader .rd-hero__grid, .course--reader .rd-grid { display: block; }
  .course--reader .rd-reader { max-width: none; font-size: 10pt; }
  .course--reader details > * { display: block; }
  .course--reader .rd-code pre { white-space: pre-wrap; overflow-wrap: anywhere; overflow: visible; }
  .course--reader .rd-table { overflow: visible; }
  .course--reader .rd-table table { min-width: 0; }
}

/* certificate call to action */
.course--reader .rd-cert { margin-top: 44px; padding: 26px clamp(18px, 4vw, 34px); border: 1px solid var(--rd-line); border-left: 3px solid var(--rd-bronze); background: #fff; }
.course--reader .rd-cert p { max-width: 62ch; }
.course--reader .rd-sc-cert { margin: 18px 0 0; padding-top: 14px; border-top: 1px solid var(--rd-line); }
.course--reader .rd-sc-cert a { color: var(--rd-ink); font-weight: 600; }
@media print { .course--reader .rd-cert { display: none !important; } }