/* Academy & Library: the editorial layer on the Arena system. Serif reading type, covers, lessons, quizzes, certificates, print. */
:root { --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif; }

/* ---------------------------------------------------------------- hero */
.ac-hero { position: relative; overflow: clip; border-radius: 24px; padding: clamp(28px, 4vw, 56px); background: radial-gradient(1200px 500px at 10% -10%, rgba(46,211,255,.16), transparent 60%), radial-gradient(900px 400px at 95% 10%, rgba(46,242,122,.14), transparent 60%), var(--surface); border: 1px solid var(--line); }
.ac-hero h1 { font-size: clamp(40px, 6vw, 84px); text-transform: uppercase; letter-spacing: -.01em; line-height: .95; }
.ac-hero .lede { margin-top: 14px; }
.ac-hero .ac-stats { display: flex; gap: 26px; flex-wrap: wrap; margin-top: 22px; }
.ac-hero .ac-stats b { font: 700 34px/1 var(--display); display: block; }
.ac-hero .ac-stats span { font: 500 12px/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--text-3); }
.ac-hero .glyphs { position: absolute; right: -10px; bottom: -30px; font: 700 220px/1 var(--serif); color: rgba(255,255,255,.035); pointer-events: none; letter-spacing: -.05em; }
.ac-hero .glyphs::after { content: attr(data-glyphs); }

/* ---------------------------------------------------------------- course cards */
.course-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); gap: 16px; }
.course { display: flex; flex-direction: column; gap: 10px; position: relative; overflow: hidden; min-height: 300px; }
.course .level { font: 500 11px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase; padding: 6px 9px; border-radius: 999px; border: 1px solid var(--line-2); color: var(--text-2); }
.course h3 { font-size: 30px; line-height: .98; }
.course .blurb { color: var(--text-2); font-size: 14.5px; }
.course .meta { display: flex; gap: 14px; flex-wrap: wrap; font: 500 12px/1.4 var(--mono); color: var(--text-3); letter-spacing: .06em; text-transform: uppercase; }
.course .price { font: 700 30px/1 var(--display); }
.course .price small { font: 500 12px/1 var(--mono); color: var(--text-3); letter-spacing: .1em; margin-left: 6px; }
.course .progress { height: 6px; border-radius: 3px; background: var(--surface-3); overflow: hidden; }
.course .progress i { display: block; height: 100%; background: var(--grad); width: 0; transition: width .6s cubic-bezier(.2,.8,.2,1); }
.course .foot { margin-top: auto; display: flex; justify-content: space-between; align-items: end; gap: 12px; }
.course .glyph { position: absolute; right: 18px; top: 10px; font: 700 84px/1 var(--serif); color: rgba(255,255,255,.05); pointer-events: none; }
.course .glyph::after { content: attr(data-glyph); }

/* ---------------------------------------------------------------- course page */
.syllabus { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 18px; }
@media (max-width: 900px) { .syllabus { grid-template-columns: 1fr; } }
.module { border-top: 1px solid var(--line); padding: 14px 0; }
.module h4 { font: 600 13px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--brand); margin-bottom: 8px; }
.lesson-row { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 12px; color: var(--text); transition: background .2s; }
.lesson-row:hover { background: var(--surface-2); color: var(--text); }
.lesson-row .n { font: 700 14px/1 var(--display); width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-3); color: var(--text-2); flex: none; }
.lesson-row.done .n { background: var(--brand); color: #07090f; }
.lesson-row .t { flex: 1; font-weight: 600; }
.lesson-row .m { font: 500 12px/1 var(--mono); color: var(--text-3); }

/* ---------------------------------------------------------------- lesson page */
.lesson-layout { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 980px) { .lesson-layout { grid-template-columns: 1fr; } }
.prose { font-family: var(--serif); font-size: 18.5px; line-height: 1.62; color: var(--text); max-width: 68ch; }
.prose p { margin: 0 0 1.05em; }
.prose h2, .prose h3, .prose h4 { font-family: var(--display); text-transform: uppercase; letter-spacing: .01em; margin: 1.5em 0 .5em; line-height: 1; }
.prose h2 { font-size: 30px; } .prose h3 { font-size: 24px; } .prose h4 { font-size: 20px; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.05em; }
.prose li { margin: .3em 0; }
.prose code { font-family: var(--mono); font-size: .82em; background: var(--surface-3); padding: 2px 6px; border-radius: 6px; }
.prose pre { background: var(--surface-2); border: 1px solid var(--line); border-radius: 12px; padding: 14px; overflow-x: auto; font-size: 14px; }
.prose blockquote { border-left: 3px solid var(--brand); margin: 1em 0; padding: 4px 0 4px 16px; color: var(--text-2); font-style: italic; }
.prose .math { font-family: var(--mono); font-size: .9em; color: var(--brand-3); }
.prose .formula-block { margin: 1.1em 0; padding: 16px 18px; border-radius: 14px; background: linear-gradient(120deg, rgba(46,242,122,.08), rgba(46,211,255,.06)); border: 1px solid var(--line-2); }
.prose .formula-block .eq { font-family: var(--mono); font-size: 17px; letter-spacing: .01em; color: var(--text); white-space: normal; overflow-wrap: anywhere; }
.prose figure { margin: 1.2em 0; }
.prose figure img { width: 100%; border-radius: 12px; border: 1px solid var(--line); }
.prose figcaption { font: 500 12.5px/1.5 var(--mono); color: var(--text-3); margin-top: 6px; }
.prose table { font-family: var(--sans); font-size: 14px; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 1.5em 0; }
.lesson-side { position: sticky; top: 84px; display: flex; flex-direction: column; gap: 14px; }
.tryit .field { margin-bottom: 8px; }
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--line); }

/* ---------------------------------------------------------------- quiz */
.quiz .q { padding: 14px 0; border-top: 1px solid var(--line); }
.quiz .q h4 { font-family: var(--sans); font-weight: 600; font-size: 15.5px; text-transform: none; letter-spacing: 0; margin: 0 0 10px; line-height: 1.4; }
.quiz .opt { display: flex; gap: 10px; align-items: flex-start; width: 100%; text-align: left; padding: 10px 12px; margin: 6px 0; border-radius: 12px; border: 1px solid var(--line); background: var(--surface-2); color: var(--text); font: 500 14px/1.4 var(--sans); cursor: pointer; transition: border-color .2s, background .2s, transform .15s; }
.quiz .opt:hover { border-color: var(--line-2); transform: translateX(2px); }
.quiz .opt i { flex: none; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--line-2); display: grid; place-items: center; font: 700 11px/1 var(--mono); color: var(--text-3); }
.quiz .opt.right { border-color: var(--win); background: rgba(46,242,122,.08); }
.quiz .opt.right i { background: var(--win); color: #07090f; border-color: var(--win); }
.quiz .opt.wrong { border-color: var(--lose); background: rgba(255,77,109,.08); }
.quiz .opt.wrong i { background: var(--lose); color: #fff; border-color: var(--lose); }
.quiz .opt[disabled] { cursor: default; transform: none; }
.quiz .why { margin-top: 8px; font-size: 13.5px; color: var(--text-2); padding: 10px 12px; border-radius: 10px; background: var(--surface-3); animation: rise .35s ease both; }
.quiz .score { display: flex; align-items: center; gap: 14px; margin-top: 14px; }

/* ---------------------------------------------------------------- library */
.lib-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr)); gap: 16px; }
.cover { aspect-ratio: 3 / 4; border-radius: 10px 14px 14px 10px; position: relative; overflow: hidden; box-shadow: 0 20px 40px rgba(0,0,0,.45), inset 4px 0 0 rgba(255,255,255,.08); background: var(--surface-2); transition: transform .35s cubic-bezier(.2,.8,.2,1), box-shadow .35s; }
.lib-item:hover .cover { transform: translateY(-6px) rotate(-1deg); box-shadow: 0 30px 50px rgba(0,0,0,.55), inset 4px 0 0 rgba(255,255,255,.1); }
.cover .spine { position: absolute; left: 0; top: 0; bottom: 0; width: 14px; background: rgba(0,0,0,.35); }
.cover .band { position: absolute; left: 14px; right: 0; top: 0; height: 34%; }
.cover .sym { position: absolute; right: 14px; bottom: 44px; font: 700 96px/1 var(--serif); color: rgba(255,255,255,.12); }
.cover .sym::after { content: attr(data-sym); }
.cover .ct { position: absolute; left: 28px; right: 18px; top: 40%; font: 700 22px/1.05 var(--display); text-transform: uppercase; color: #fff; text-shadow: 0 2px 10px rgba(0,0,0,.4); }
.cover .cs { position: absolute; left: 28px; right: 18px; bottom: 18px; font: 500 11px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,.75); }
.cover .tag { position: absolute; left: 28px; top: 14px; font: 500 11px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase; color: rgba(255,255,255,.85); }
.cover.sheet { aspect-ratio: 1 / 1.3; border-radius: 6px; }
.cover.sheet .band { height: 22%; }
.cover.sheet .ct { top: 28%; font-size: 19px; }
.lib-item h3 { font-size: 20px; margin-top: 12px; }
.lib-item .blurb { font-size: 13.5px; color: var(--text-2); margin-top: 4px; min-height: 3.6em; }
.lib-item .row { margin-top: 10px; }
.price-tag { font: 700 22px/1 var(--display); }
.price-tag.free { color: var(--brand); }
.basket { position: sticky; top: 84px; }
.basket .line { display: flex; justify-content: space-between; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.basket .total { display: flex; justify-content: space-between; padding-top: 12px; font: 700 26px/1 var(--display); }

/* ---------------------------------------------------------------- reader */
.reader { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 28px; }
@media (max-width: 900px) { .reader { grid-template-columns: 1fr; } }
.reader .toc { position: sticky; top: 84px; align-self: start; }
.reader .toc a { display: block; padding: 7px 10px; border-radius: 10px; color: var(--text-2); font-size: 14px; }
.reader .toc a:hover, .reader .toc a.on { background: var(--surface-2); color: var(--text); }
.reader .toc a.locked { color: var(--text-3); }
.reader .toc a.locked::after { content: " ·  locked"; font: 500 10px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.chapter { padding: 20px 0 30px; border-top: 1px solid var(--line); }
.chapter .chnum { font: 500 12px/1.4 var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--brand); }
.chapter h2 { font-size: clamp(30px, 3.4vw, 46px); margin: 6px 0 14px; text-transform: uppercase; line-height: .98; }
.chapter .src { font: 500 12px/1.5 var(--mono); color: var(--text-3); margin-bottom: 14px; }
.chapter.locked .prose { max-height: 260px; overflow: clip; -webkit-mask-image: linear-gradient(#000 40%, transparent); mask-image: linear-gradient(#000 40%, transparent); }
.paywall { margin-top: -30px; position: relative; z-index: 1; }
.book-hero { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 26px; align-items: center; }
@media (max-width: 720px) { .book-hero { grid-template-columns: 1fr; } }
.book-hero h1 { font-size: clamp(36px, 5vw, 64px); text-transform: uppercase; line-height: .95; }
.book-hero .sub { font-family: var(--serif); font-size: 20px; color: var(--text-2); margin-top: 8px; font-style: italic; }

/* ---------------------------------------------------------------- certificate */
.certificate { position: relative; background: #f6f1e7; color: #14161c; border-radius: 6px; padding: clamp(28px, 5vw, 64px); max-width: 980px; margin: 0 auto; box-shadow: 0 30px 60px rgba(0,0,0,.5); overflow: hidden; }
.certificate::before { content: ""; position: absolute; inset: 14px; border: 1.5px solid #14161c; border-radius: 3px; pointer-events: none; }
.certificate::after { content: ""; position: absolute; inset: 20px; border: .5px solid rgba(20,22,28,.4); border-radius: 2px; pointer-events: none; }
.certificate .cwm { font: 500 12px/1 var(--mono); letter-spacing: .3em; text-transform: uppercase; }
.certificate h1 { font: 700 clamp(34px, 5vw, 60px)/1 var(--display); text-transform: uppercase; margin: 18px 0 8px; }
.certificate .who { font: italic 400 clamp(28px, 4vw, 44px)/1.1 var(--serif); margin: 26px 0 8px; }
.certificate .what { font-family: var(--serif); font-size: 19px; max-width: 60ch; }
.certificate .sig { display: flex; justify-content: space-between; gap: 20px; margin-top: 40px; flex-wrap: wrap; font: 500 12px/1.6 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.certificate .seal { position: absolute; right: 44px; top: 44px; width: 110px; height: 110px; border-radius: 50%; background: var(--grad); display: grid; place-items: center; color: #07090f; font: 700 13px/1.1 var(--display); text-align: center; text-transform: uppercase; letter-spacing: .06em; box-shadow: 0 10px 30px rgba(0,0,0,.25); }

/* ---------------------------------------------------------------- print */
@media print {
  .top, .foot, .lesson-side, .lesson-nav, .toc, .paywall, .no-print { display: none !important; }
  body { background: #fff; color: #111; }
  .page { max-width: none; padding: 0; }
  .prose, .chapter { color: #111; }
  .prose .formula-block { border-color: #ccc; background: #f3f3f3; }
  .prose .formula-block .eq, .prose .math { color: #111; }
  .chapter { page-break-inside: avoid; border-top-color: #ddd; }
  .reader { display: block; }
  .certificate { box-shadow: none; }
}

/* ------------------------------------------------------------------ figures and callouts in the prose */
.prose figure.fig { margin: 1.6em 0; width: min(100vw - 48px, 860px); max-width: none; }
@media (max-width: 1180px) { .prose figure.fig { width: 100%; } }
.prose figure.fig svg { width: 100%; height: auto; display: block; border-radius: 12px; border: 1px solid var(--line); background: var(--surface); }
.prose figure.fig svg text { font-family: var(--mono); }
.prose .fig-missing { padding: 14px; border: 1px dashed var(--line-2); border-radius: 12px; color: var(--text-3); font: 500 12px var(--mono); }
.prose .callout { margin: 1.4em 0; padding: 16px 20px 6px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface-2); position: relative; }
.prose .callout.example { border-color: rgba(46, 211, 255, .35); background: linear-gradient(180deg, rgba(46, 211, 255, .07), transparent 70%), var(--surface-2); }
.prose .callout.practice { border-color: rgba(232, 255, 71, .35); background: linear-gradient(180deg, rgba(232, 255, 71, .06), transparent 70%), var(--surface-2); }
.prose .callout-title { font: 600 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--brand-2); margin-bottom: 10px; }
.prose .callout.practice .callout-title { color: var(--brand-3); }
.prose .callout p, .prose .callout li { font-size: 15.5px; }
.prose .callout h3, .prose .callout h4 { font-size: 18px; margin-top: 10px; }
.prose .callout table.data { font-size: 13.5px; }
.prose .callout .formula-block { margin: 10px 0; }
.course-picture { margin: 12px 0 4px; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); background: var(--surface); }
.course-picture svg { width: 100%; height: auto; display: block; }
.course.card .course-picture { margin: 10px -4px 6px; }