/* White ground, near-black ink, no accent colour, no shadow, no gradient.
   Source Serif 4 for reading, system sans for interface labels. Colour comes from photographs. */
:root{--paper:#FFFFFF;--ink:#111111;--ink-soft:#4A4A4A;--line:#D2D2D2;
  --display:"Source Serif 4",Georgia,serif;--text:"Source Serif 4",Georgia,serif;
  --ui:-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,sans-serif;
  --code:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;--r:10px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:70px}
body{background:var(--paper);color:var(--ink);font-family:var(--text);font-size:1.15rem;line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit}
.wrap{width:min(1100px,100% - 3rem);margin-inline:auto}
.narrow{width:min(760px,100% - 3rem);margin-inline:auto}
section{padding:clamp(3.5rem,8vw,6.5rem) 0;border-top:2px solid var(--ink)}
h1,h2,h3{font-family:var(--display);font-weight:600;line-height:1.15;letter-spacing:-.01em}
h1{font-size:clamp(2.2rem,5vw,3.6rem)}
h2{font-size:clamp(1.9rem,4vw,3rem);max-width:24ch}
h3{font-size:1.35rem;line-height:1.3}
p+p{margin-top:1rem}
.lede{max-width:58ch;margin-top:1.2rem;color:var(--ink-soft);font-size:1.1rem}
.label,.sec-label,figcaption,.meta,.chip{font-family:var(--ui);font-size:.85rem;font-weight:600;color:var(--ink-soft)}
.sec-label{display:block;margin-bottom:1rem}
nav{position:fixed;inset:0 0 auto 0;z-index:50;display:flex;align-items:center;justify-content:space-between;padding:.8rem 1.5rem;background:#fff;border-bottom:1px solid var(--line)}
.brand{text-decoration:none;font-family:var(--display);font-size:1.35rem;font-weight:700}
.nav-links{display:flex;gap:1.3rem;align-items:center;flex-wrap:wrap}
.nav-links a{text-decoration:none;font-family:var(--ui);font-size:.92rem;font-weight:500}
.nav-links a:hover{text-decoration:underline;text-underline-offset:5px}
.nav-cta{background:var(--ink);color:#fff!important;padding:.5rem 1.15rem;border-radius:99px}
.btn{display:inline-block;text-decoration:none;border:1px solid var(--ink);padding:.9rem 1.7rem;font-family:var(--ui);font-size:1rem;font-weight:600;background:transparent;color:var(--ink);border-radius:99px;cursor:pointer}
.btn-ink{background:var(--ink);color:#fff}
.btn:hover{opacity:.85}
.btn-row{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.6rem}
main{padding-top:64px}

/* hero mosaic */
.c-hero{position:relative;padding:14px;min-height:calc(100svh - 64px)}
.mosaic{display:grid;grid-template-columns:repeat(6,1fr);grid-auto-rows:calc((100svh - 118px) / 3);gap:12px;overflow:hidden}
.mosaic img{width:100%;height:100%;border-radius:var(--r);object-fit:cover}
.hero-center{position:absolute;inset:0;display:grid;place-items:center;padding:1.5rem;pointer-events:none}
.hero-box{pointer-events:auto;background:#fff;border-radius:16px;padding:2.4rem 2.6rem;max-width:680px;text-align:center}
.hero-box h1{margin:.7rem 0 1rem}
.hero-box .btn-row{justify-content:center}
.hero-sub{color:var(--ink-soft);font-size:1.08rem}

/* facts */
.facts{display:grid;grid-template-columns:repeat(4,1fr);margin-top:3rem;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}
.facts div{padding:1.3rem 1rem;border-right:1px solid var(--line)}
.facts div:last-child{border-right:0}
.facts b{display:block;font-weight:600;font-size:2.3rem;line-height:1.1}
.facts span{font-family:var(--ui);font-size:.85rem;color:var(--ink-soft)}

/* about */
.about{display:grid;grid-template-columns:1fr 1.2fr;gap:3rem;align-items:center;margin-top:2.5rem}
.about img{border-radius:var(--r);width:100%;aspect-ratio:4/3;object-fit:cover}

/* dark proof band */
.dark{background:var(--ink);color:#fff;border-top:0}
.dark .sec-label,.dark figcaption,.dark .lede{color:rgba(255,255,255,.75)}
.proof{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem;margin-top:3rem}
.proof figure img{width:100%;height:250px;object-fit:cover;border-radius:var(--r)}
.proof figcaption{margin-top:.7rem;line-height:1.45}
.proof figcaption b{display:block;color:#fff;font-size:.95rem}
.places{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:2.4rem}
.places span{font-family:var(--ui);font-size:.85rem;border:1px solid rgba(255,255,255,.5);padding:.35rem .9rem;border-radius:99px}

/* topics and tracks */
.topic-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 3rem;margin-top:2.5rem}
.topic{display:block;text-decoration:none;padding:1.6rem 0;border-top:1px solid var(--line)}
.topic h3{margin:.4rem 0 .5rem}.topic p{color:var(--ink-soft);font-size:1rem}
.topic:hover h3{text-decoration:underline;text-underline-offset:5px}
.track{margin-top:3.4rem}
.track-head{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;flex-wrap:wrap;border-top:2px solid var(--ink);padding-top:1.2rem}
.track-head p{color:var(--ink-soft);max-width:60ch;margin-top:.4rem}
.weeks{margin-top:1rem}
.week{display:grid;grid-template-columns:5.5rem 1fr auto;gap:1.2rem;align-items:baseline;padding:.95rem 0;border-top:1px solid var(--line);text-decoration:none}
.week .wk{font-family:var(--ui);font-size:.85rem;font-weight:600;color:var(--ink-soft)}
.week .t{font-weight:600}
.week .go{font-family:var(--ui);font-size:.85rem;font-weight:600}
.week:hover .t{text-decoration:underline;text-underline-offset:5px}
.week p{grid-column:2/4;color:var(--ink-soft);font-size:.98rem;margin-top:-.4rem}

/* document pages */
.doc-head{padding:clamp(3rem,6vw,5rem) 0 2rem}
.crumbs{font-family:var(--ui);font-size:.85rem;color:var(--ink-soft);margin-bottom:1.2rem}
.crumbs a{text-decoration:none}.crumbs a:hover{text-decoration:underline}
.doc-head .meta{margin-top:1rem;display:flex;gap:1.2rem;flex-wrap:wrap}
.doc h2{font-size:1.8rem;max-width:none;margin:2.8rem 0 1rem}
.doc ul,.doc ol{margin:1rem 0 0 1.4rem}.doc li{margin-top:.45rem}
.box{border:1px solid var(--ink);border-radius:var(--r);padding:1.4rem 1.6rem;margin-top:2rem}
.box h3{margin-bottom:.6rem}
dl.terms{margin-top:1rem}
dl.terms dt{font-weight:600;margin-top:1rem}
dl.terms dd{color:var(--ink-soft)}
.pager{display:flex;justify-content:space-between;gap:1rem;margin-top:3.4rem;border-top:1px solid var(--ink);padding-top:1.4rem;flex-wrap:wrap}
.pager a{text-decoration:none;font-family:var(--ui);font-weight:600}
.pager a:hover{text-decoration:underline}
.timeline div{display:grid;grid-template-columns:6rem 1fr;gap:1rem;padding:.7rem 0;border-top:1px solid var(--line)}
.timeline b{font-family:var(--ui);font-size:.9rem}
.faq details{border-top:1px solid var(--line);padding:1rem 0}
.faq summary{font-weight:600;cursor:pointer}
.faq p{margin-top:.6rem;color:var(--ink-soft)}
footer{border-top:2px solid var(--ink);padding:3rem 0 4rem;font-family:var(--ui);font-size:.92rem;color:var(--ink-soft)}
footer .wrap{display:flex;justify-content:space-between;gap:2rem;flex-wrap:wrap}
footer a{color:var(--ink)}

/* slide viewer */
body.deck{background:#fff;overflow:hidden}
.deck-bar{position:fixed;inset:0 0 auto 0;height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 1.2rem;border-bottom:1px solid var(--line);background:#fff;z-index:10;font-family:var(--ui);font-size:.88rem}
.deck-bar a,.deck-bar button{font-family:var(--ui);font-size:.88rem;font-weight:600;text-decoration:none;color:var(--ink);background:none;border:1px solid var(--ink);padding:.4rem .95rem;border-radius:99px;cursor:pointer}
.deck-bar .grp{display:flex;gap:.5rem;align-items:center}
.stage{position:fixed;inset:52px 0 4px 0;display:grid;place-items:center;padding:2vh 4vw}
.slide{display:none;width:min(100%,calc((100vh - 120px) * 16 / 9));aspect-ratio:16/9;padding:5% 6%;flex-direction:column;justify-content:center;overflow:hidden;border:1px solid var(--line);border-radius:var(--r);background:#fff}
.slide.on{display:flex}
.slide .k{font-family:var(--ui);font-size:clamp(.7rem,1.1vw,1rem);font-weight:600;color:var(--ink-soft);margin-bottom:.8em}
.slide h2{font-size:clamp(1.5rem,3.6vw,3.2rem);max-width:none;margin-bottom:.7em}
.slide ul{list-style:none;font-size:clamp(1rem,2vw,1.8rem);line-height:1.4}
.slide li{padding:.28em 0 .28em 1.1em;position:relative}
.slide li::before{content:"";position:absolute;left:0;top:.78em;width:.4em;height:.4em;border-radius:50%;background:var(--ink)}
.slide pre{margin-top:1em;background:#F3F3F3;border-radius:var(--r);padding:.8em 1em;font-family:var(--code);font-size:clamp(.7rem,1.2vw,1.1rem);line-height:1.45;overflow:hidden;white-space:pre-wrap}
.slide.title{justify-content:center}
.slide.title h2{font-size:clamp(2rem,5vw,4.4rem)}
.slide.title ul{color:var(--ink-soft)}
.slide.title li::before{display:none}.slide.title li{padding-left:0}
.notes{position:fixed;inset:auto 0 4px 0;background:#fff;border-top:1px solid var(--ink);padding:1rem 1.6rem;font-size:1rem;display:none;max-height:28vh;overflow:auto;z-index:9}
.notes.on{display:block}
.progress{position:fixed;inset:auto 0 0 0;height:4px;background:var(--line)}
.progress i{display:block;height:100%;background:var(--ink);width:0}

@media (max-width:820px){
  .mosaic{grid-template-columns:repeat(3,1fr)}
  .facts{grid-template-columns:1fr 1fr}.facts div:nth-child(2){border-right:0}
  .about,.topic-grid{grid-template-columns:1fr}
  .proof{grid-template-columns:1fr 1fr}
  .week{grid-template-columns:4.2rem 1fr}.week .go{display:none}.week p{grid-column:2}
  .nav-links a:not(.nav-cta){display:none}
  .hero-box{padding:1.6rem}
}
@media (max-width:520px){.proof{grid-template-columns:1fr}}
@media print{
  body.deck{overflow:visible}.deck-bar,.notes,.progress{display:none!important}
  .stage{position:static;display:block;padding:0}
  .slide{display:flex!important;width:100%;height:100vh;aspect-ratio:auto;border:0;page-break-after:always}
  @page{size:landscape;margin:12mm}
}

/* visuals */
.vis{margin:2.2rem 0;border-top:1px solid var(--ink);padding-top:1rem}
.vis .vt{font-family:var(--display);font-weight:600;font-size:1.15rem}
.vis .unit{font-family:var(--ui);font-size:.8rem;color:var(--ink-soft);margin-top:.2rem}
.cap{font-family:var(--ui);font-size:.82rem;color:var(--ink-soft);margin-top:.6rem;line-height:1.5}
.cap span{display:block}
.tbl{overflow-x:auto;margin-top:.8rem}
table{border-collapse:collapse;width:100%;font-size:.98rem}
th,td{text-align:left;padding:.65rem .8rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--ui);font-size:.8rem;font-weight:600;color:var(--ink-soft);border-bottom:1px solid var(--ink)}
.chart{width:100%;height:auto;margin-top:.8rem;font-family:var(--ui);font-size:12px;fill:var(--ink-soft)}
.chart .vl{fill:#111;font-weight:600}
.story{margin:2.4rem 0;border:1px solid var(--ink);border-radius:var(--r);padding:1.5rem 1.7rem}
.story h3{margin:.4rem 0 .6rem}.story p{color:var(--ink)}
.flow{list-style:none;margin:1rem 0 0!important;display:flex;flex-wrap:wrap;gap:.6rem 2.2rem;counter-reset:f}
.flow li{counter-increment:f;border:1px solid var(--ink);border-radius:var(--r);padding:.7rem 1rem;position:relative;font-size:1rem;margin:0}
.flow li::before{content:counter(f);font-family:var(--ui);font-size:.75rem;font-weight:700;display:block;color:var(--ink-soft)}
.flow li:not(:last-child)::after{content:"\2192";position:absolute;right:-1.65rem;top:50%;transform:translateY(-50%);font-family:var(--ui)}

/* ux */
.toc{position:sticky;top:64px;z-index:20;background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow-x:auto;white-space:nowrap}
.toc .wrap{display:flex;gap:1.4rem;padding:.7rem 0}
.toc a{font-family:var(--ui);font-size:.85rem;font-weight:500;text-decoration:none;color:var(--ink-soft);padding-bottom:.2rem;border-bottom:2px solid transparent}
.toc a.on{color:var(--ink);border-bottom-color:var(--ink)}
.tools{margin-top:1.8rem;display:flex;gap:1rem;flex-wrap:wrap;align-items:center}
#q{flex:1 1 320px;font-family:var(--ui);font-size:1rem;padding:.8rem 1.2rem;border:1px solid var(--ink);border-radius:99px;background:#fff;color:var(--ink)}
.chips{display:flex;gap:.5rem;flex-wrap:wrap}
.chip{background:#fff;border:1px solid var(--ink);color:var(--ink);padding:.45rem .95rem;border-radius:99px;cursor:pointer;font-family:var(--ui)}
.chip.on{background:var(--ink);color:#fff}
.prog{font-family:var(--ui);font-size:.85rem;font-weight:600;color:var(--ink-soft);margin-top:.6rem}
.week.done .t::after{content:" \2713";font-family:var(--ui)}
.track-photo img{width:100%;max-height:420px;object-fit:cover;border-radius:var(--r);margin-bottom:2rem}
.ov{position:fixed;inset:52px 0 4px 0;background:#fff;z-index:12;padding:1.5rem 4vw;overflow:auto;display:none}
.ov.on{display:block}
.ov ol{max-width:700px;margin:0 auto;list-style-position:inside;font-family:var(--ui)}
.ov li{border-top:1px solid var(--line)}
.ov button{background:none;border:0;font-family:var(--display);font-size:1.1rem;padding:.7rem 0;cursor:pointer;color:var(--ink);text-align:left;width:calc(100% - 2rem)}
.ov button:hover{text-decoration:underline}
.slide table{font-size:clamp(.75rem,1.4vw,1.2rem);margin-top:.6em}
.slide .chart{max-height:52%;width:auto;max-width:100%;margin:0 auto}
@media print{.toc,#done{display:none}.nav-links,nav{display:none}main{padding-top:0}}

/* audiences */
.aud-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.4rem;margin-top:2.6rem}
.aud img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:top;border-radius:var(--r)}
.aud h3{margin:1rem 0 .4rem}
.aud p{color:var(--ink-soft);font-size:1rem}
@media (max-width:980px){.aud-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.aud-grid{grid-template-columns:1fr}}

/* course cards */
.course-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:2.4rem 2rem;margin-top:2.8rem}
.course{display:block;text-decoration:none}
.course img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:var(--r)}
.course .label{display:block;margin-top:1rem}
.course h3{margin:.3rem 0 .4rem;font-size:1.6rem}
.course p{color:var(--ink-soft);font-size:1rem}
.course .more{display:inline-block;margin-top:.6rem;font-family:var(--ui);font-weight:600;font-size:.95rem}
.course:hover h3{text-decoration:underline;text-underline-offset:5px}
@media (max-width:700px){.course-grid{grid-template-columns:1fr}}