/* Open Mathematics Courses. Colours and type follow the Program Matematika Indonesia interface. */
:root{
  color-scheme:light dark;
  --ink:#15302e;--muted:#516663;--paper:#f5f5ec;--card:#fffef9;--line:#cfdbd2;--line-strong:#879f95;
  --accent:#175e50;--accent-ink:#ffffff;--soft:#e7ece3;--code:#eef2ea;
  --notice:#fbf6e4;--notice-line:#d8c07a;--warn:#fbeee8;--warn-line:#d49a7a;
  --focus:#ad6400;
  --serif:Georgia,"Times New Roman",serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{
    --ink:#e3ebe7;--muted:#a3b6b0;--paper:#0f1716;--card:#16211f;--line:#2c3b38;--line-strong:#4f6661;
    --accent:#7fcbb5;--accent-ink:#0f1716;--soft:#1c2a27;--code:#1a2624;
    --notice:#25231a;--notice-line:#7d6a36;--warn:#2b1d18;--warn-line:#8a5a44;
    --focus:#f0a44b;
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.6 var(--sans)}
a{color:var(--accent);text-underline-offset:.2em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
button,input{font:inherit;color:inherit}
[hidden]{display:none!important}
html:not(.js) .js-only{display:none!important}

.skip-link{position:absolute;left:1rem;top:-5rem;background:var(--card);color:var(--ink);padding:.5rem .8rem;z-index:5;border:1px solid var(--line)}
.skip-link:focus{top:1rem}

.site-header{border-bottom:1px solid var(--line);background:var(--card)}
.header-inner{max-width:1200px;margin:auto;padding:.9rem 1.5rem;display:flex;align-items:center;gap:.6rem 1.5rem;flex-wrap:wrap}
.brand{font:700 1.15rem/1.2 var(--sans);text-decoration:none;color:var(--ink)}
.primary-nav{display:flex;gap:.4rem 1.1rem;flex-wrap:wrap;align-items:baseline;margin-right:auto}
.nav-note{color:var(--muted);font-size:.85em}
.lang-note{margin:0;font-size:.8rem;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:.1rem .6rem}

main{max-width:1200px;margin:auto;padding:1.6rem 1.5rem 3rem}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;letter-spacing:-.01em;line-height:1.25}
h1{font-size:clamp(1.8rem,4vw,2.6rem);margin:.3rem 0 1rem}
h2{font-size:1.45rem;margin:2rem 0 .7rem}
h3{font-size:1.2rem;margin:1.6rem 0 .6rem}
h4{font-size:1.15rem;margin:.3rem 0 .6rem}
p{margin:.5rem 0 1rem}
.eyebrow{font:600 .8rem/1.4 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0}
.lead{font-size:1.1rem;color:var(--muted);max-width:52rem}
.note{color:var(--muted);font-size:.95rem;max-width:52rem}
.small{font-size:.85rem;color:var(--muted);margin:.2rem 0 0}
.intro{max-width:56rem}
.intro .lead{color:var(--ink)}

/* Catalogue */
.filters{background:var(--soft);border-radius:.7rem;padding:1rem;display:flex;flex-direction:column;gap:.8rem;margin:.5rem 0 1rem}
.chip-group{display:flex;flex-wrap:wrap;gap:.45rem;align-items:center}
.group-label{font-size:.8rem;font-weight:650;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-right:.35rem;min-width:9.5rem}
.chip{display:inline-flex;align-items:center;gap:.35rem;border:1px solid var(--line-strong);border-radius:999px;padding:.3rem .8rem;background:var(--card);color:var(--ink);text-decoration:none;font-size:.92rem;cursor:pointer;line-height:1.3}
.chip:hover{border-color:var(--accent)}
.chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.chip .count{font-size:.78rem;opacity:.8}
.search{display:flex;align-items:center;gap:.35rem;flex-wrap:wrap}
.search input{flex:1 1 16rem;min-width:0;max-width:28rem;border:1px solid var(--line-strong);border-radius:.4rem;padding:.45rem .6rem;background:var(--card)}
.result-count{font-size:.9rem;color:var(--muted);margin:.2rem 0 .8rem}
.empty-state button{border:1px solid var(--line-strong);border-radius:.4rem;background:var(--card);padding:.3rem .7rem;cursor:pointer}
.shelf{margin:1.2rem 0 2rem}
.shelf h3{display:flex;align-items:baseline;gap:.7rem;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:.3rem}
.shelf-count{font:400 .85rem var(--sans);color:var(--muted)}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,21rem),1fr));gap:1rem}
.course-card{min-width:0;overflow-wrap:anywhere;border:1px solid var(--line);border-radius:.7rem;background:var(--card);padding:1.2rem 1.25rem;scroll-margin-top:1rem}
.card-top{display:flex;justify-content:space-between;gap:1rem;font-size:.8rem;color:var(--muted)}
.course-code{font:700 .85rem var(--mono);letter-spacing:.03em}
.course-card>p{color:var(--muted);font-size:.96rem}
.course-card>p.card-author{color:var(--ink);font-size:.88rem;margin:-.2rem 0 .5rem}
.card-facts{margin:.6rem 0 0;border-top:1px solid var(--line);padding-top:.5rem;font-size:.88rem}
.card-facts div{display:grid;grid-template-columns:6.5rem 1fr;gap:.6rem;padding:.2rem 0}
.card-facts dt{color:var(--muted);font-weight:600}
.card-facts dd{margin:0}
.pointer-card{border-style:dashed}
.pointer-links{padding-left:1.1rem;font-size:.95rem}
.where{color:var(--muted);font-size:.85em}
.about ul{padding-left:1.2rem;max-width:56rem}
.about li{margin:.4rem 0}

/* Course pages */
.crumbs{font-size:.9rem;margin-bottom:.8rem;color:var(--muted);display:flex;gap:.45rem;flex-wrap:wrap}
.facts{list-style:none;padding:0;margin:.3rem 0 1rem;display:flex;flex-wrap:wrap;gap:.45rem}
.facts li{border:1px solid var(--line);border-radius:999px;padding:.12rem .7rem;font-size:.85rem;background:var(--card)}
.take-first,.provenance,.licence,.lessons{max-width:56rem}
.take-first-list{padding-left:1.2rem}
.take-first-list li{margin:.25rem 0}
.assumed{border:1px solid var(--line);border-radius:.5rem;background:var(--card);padding:.5rem .9rem;margin:.8rem 0}
.assumed summary{cursor:pointer;font-weight:600}
.assumed ul{margin:.5rem 0;padding-left:1.2rem}
.assumed li{margin:.3rem 0;overflow-wrap:anywhere}
.lesson-list{padding-left:0;list-style:none;counter-reset:lesson;margin:0}
.lesson-list li{counter-increment:lesson;display:flex;flex-wrap:wrap;gap:.2rem .8rem;align-items:baseline;justify-content:space-between;padding:.55rem 0;border-bottom:1px solid var(--line)}
.lesson-list li::before{content:counter(lesson) ".";color:var(--muted);font-size:.85rem;min-width:1.8rem}
.lesson-list a{flex:1 1 20rem;text-decoration:none}
.lesson-list a:hover .lesson-title{text-decoration:underline}
.lesson-id{font:600 .8rem var(--mono);color:var(--muted);margin-right:.4rem}
.lesson-check{font-size:.8rem;color:var(--muted)}
.source-id{margin-top:2rem;border-top:1px solid var(--line);padding-top:.8rem;font-size:.9rem;color:var(--muted);max-width:56rem}
.source-id summary{cursor:pointer;font-weight:600;color:var(--ink)}
.source-id code{overflow-wrap:anywhere}
.table-wrap{overflow-x:auto;max-width:100%}
table{border-collapse:collapse;margin:.8rem 0}
th,td{border:1px solid var(--line);padding:.4rem .6rem;text-align:left;vertical-align:top}
th{background:var(--soft)}

/* Lessons */
.notice{border:1px solid var(--notice-line);background:var(--notice);border-radius:.6rem;padding:.7rem 1rem;margin:0 0 1rem;max-width:48rem}
.notice p{margin:.2rem 0}
.notice-warn{border-color:var(--warn-line);background:var(--warn)}
.notice h2{font-size:1.05rem;margin:.1rem 0 .3rem}
.lesson{max-width:48rem;line-height:1.65;overflow-wrap:break-word}
.lesson h1{margin-top:1.2rem}
.lesson h2{font-size:1.35rem;margin-top:2.4rem;padding-top:.8rem;border-top:1px solid var(--line);scroll-margin-top:1rem}
.lesson h3,.lesson h4{scroll-margin-top:1rem}
.lesson h3{font-size:1.15rem}
.lesson h4{font-size:1.02rem}
.lesson code{font-family:var(--mono);font-size:.88em;background:var(--code);padding:.05em .3em;border-radius:.25em;overflow-wrap:anywhere}
.lesson pre{background:var(--code);padding:.8rem 1rem;border-radius:.5rem;overflow-x:auto}
.lesson pre code{background:none;padding:0}
.lesson blockquote{margin:1rem 0;padding:.2rem 1rem;border-left:3px solid var(--line-strong);color:var(--muted)}
.lesson table{display:block;max-width:100%;overflow-x:auto}
.lesson img{max-width:100%;height:auto;background:#fff;border-radius:.3rem}
.lesson li{margin:.25rem 0}
.lesson hr{border:0;border-top:1px solid var(--line);margin:2rem 0}
.math-display{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;padding:.25rem 0;margin:.4rem 0}
.math-display mjx-container[display="true"]{min-width:0!important;margin:.4em 0!important}
.math:not(.math-display){overflow-wrap:anywhere;display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle}
mjx-container{color:inherit}
.figure-provenance{max-width:48rem;margin:1.5rem 0;font-size:.9rem;color:var(--muted)}
.figure-provenance summary{cursor:pointer;font-weight:600;color:var(--ink)}
.pager{max-width:48rem;display:flex;justify-content:space-between;align-items:center;gap:1rem;margin:2.5rem 0 0;padding-top:1rem;border-top:1px solid var(--line);flex-wrap:wrap}
.pager-prev,.pager-next{min-width:6rem;flex:1 1 12rem}
.pager-next{text-align:right}
.source-link{max-width:48rem;margin-top:1rem}

/* Results found in making these courses */
.results-toc ul{list-style:none;padding:0;margin:.4rem 0 1.2rem;display:flex;flex-wrap:wrap;gap:.45rem;max-width:56rem}
.results-toc li{border:1px solid var(--line);border-radius:999px;padding:.15rem .75rem;background:var(--card);font-size:.9rem}
.results-toc .count{color:var(--muted);font-size:.8rem;margin-left:.2rem}
.results{max-width:48rem}
.results-group h2{scroll-margin-top:1rem;border-bottom:1px solid var(--line);padding-bottom:.3rem}
.result{border-bottom:1px solid var(--line);padding:.4rem 0 .9rem;overflow-wrap:break-word;scroll-margin-top:1rem}
.result h3{font-size:1.1rem;margin:1rem 0 .4rem}
.result p{margin:.35rem 0}
.result-link{font-size:.95rem}
.exposition{border-left:3px solid var(--line-strong);padding:.1rem 0 .1rem .9rem;margin:.6rem 0 .2rem!important;color:var(--muted);font-size:.95rem}
.bibliography{list-style:none;padding-left:0;max-width:48rem}
.bibliography li{margin:.45rem 0;padding-left:1.5rem;text-indent:-1.5rem}
.ref-key{font-weight:600}

.site-footer{border-top:1px solid var(--line);max-width:1200px;margin:auto;padding:1.5rem;font-size:.9rem;color:var(--muted)}
.site-footer nav{display:flex;flex-wrap:wrap;gap:.5rem 1.2rem}

@media (max-width:700px){
  body{font-size:16px}
  .header-inner,main{padding-left:1rem;padding-right:1rem}
  .site-footer{padding:1.2rem 1rem}
  .group-label{min-width:100%}
  .card-facts div{grid-template-columns:1fr;gap:0}
  .lesson h2{font-size:1.2rem}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
@media print{.site-header,.filters,.pager,.skip-link,.site-footer nav{display:none!important}a{color:inherit}.course-card{break-inside:avoid}}