/* Leitner Studio
   Mobile first. Full-bleed color fields mark each change of register:
   black for landings, cobalt for section openers, white for reading.
   Prose holds a 620px measure at every width; heroes, grids and
   contact widen to 1240px on desktop. */
:root{
  --ink:#0a0a0a;
  --paper:#ffffff;
  --accent:#1e3fd8;        /* cobalt, used as a field */
  --accent-deep:#13288f;   /* hover state for cobalt buttons */
  --neutral:#9d9fa2;
  --neutral-soft:#eeeeef;
  --display:"Archivo","Arial Black",Helvetica,Arial,sans-serif;
  --read:"Source Serif 4",Georgia,"Times New Roman",serif;
  --pad:22px; --max:620px; --wide:1240px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--ink);color:var(--paper);font-family:var(--read);font-size:19px;line-height:1.58;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
.prose a{text-decoration-thickness:1px;text-underline-offset:3px}
.prose a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.field-ink :focus-visible,.field-accent :focus-visible{outline-color:var(--paper)}
[id]{scroll-margin-top:12px}

/* fields */
.field{padding-inline:var(--pad)}
.field-ink{background:var(--ink);color:var(--paper)}
.field-accent{background:var(--accent);color:var(--paper)}
.field-paper{background:var(--paper);color:var(--ink)}
.wrap{max-width:var(--wide);margin-inline:auto}
.measure{max-width:var(--max)}

/* type */
.label{font-family:var(--display);font-weight:900;font-size:12px;letter-spacing:.18em;text-transform:uppercase;line-height:1.3}
.headline{font-family:var(--display);font-weight:900;font-stretch:92%;text-transform:uppercase;letter-spacing:.02em;line-height:1.0;font-size:clamp(34px,9vw,72px);margin:12px 0 0;text-wrap:balance}
.headline.page{font-size:clamp(34px,8.6vw,78px);line-height:.98}
.subhead{font-family:var(--display);font-weight:900;font-stretch:92%;text-transform:uppercase;letter-spacing:.02em;line-height:1.08;font-size:clamp(24px,5.4vw,34px);margin:10px 0 0;text-wrap:balance}
.prose p{margin:0 0 22px}
.prose p:last-child{margin-bottom:0}
.lede{font-size:20px;line-height:1.55}
.credit{font-family:var(--read);font-style:italic;font-size:19px;line-height:1.45;margin:18px 0 0;max-width:var(--max)}

/* top bar */
.topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px 28px;padding-block:22px}
.wordmark{text-decoration:none;font-size:13px;letter-spacing:.22em}
.nav{display:flex;flex-wrap:wrap;gap:6px 20px}
.nav a{text-decoration:none;padding-block:10px;opacity:.9}
.nav a:hover{opacity:1;text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:2px}

/* hero (home) */
.hero{padding-block:44px 64px}
.mega{font-family:var(--display);font-weight:900;font-stretch:88%;text-transform:uppercase;letter-spacing:.015em;line-height:.9;margin:0}
.mega span{display:block}
.mega .l1{font-size:clamp(46px,13.2vw,156px)}
.mega .l2{font-size:clamp(58px,17vw,224px);margin-top:.04em}
.outline{color:transparent;-webkit-text-stroke:3px var(--paper);paint-order:stroke}
@supports not (-webkit-text-stroke:1px black){.outline{color:var(--paper)}}
.hero .lede{margin:40px 0 0}
.hero .actions{margin-top:36px;max-width:360px}

/* buttons: flat; hover shifts color */
.btn{display:block;width:100%;border:0;padding:20px 22px;text-align:center;text-decoration:none;cursor:pointer;
  font-family:var(--display);font-weight:900;font-size:16px;letter-spacing:.12em;text-transform:uppercase;line-height:1.2;
  background:var(--ink);color:var(--paper);transition:background .12s,color .12s,border-color .12s,transform .06s}
.btn:hover{background:var(--accent)}
.btn:active{transform:translateY(2px)}
.btn.accent{background:var(--accent);color:var(--paper)}
.btn.accent:hover{background:var(--accent-deep)}
.btn.white{background:var(--paper);color:var(--ink)}
.btn.white:hover{background:var(--ink);color:var(--paper)}
.btn.ghost{background:transparent;color:inherit;border:3px solid currentColor;padding:17px 22px}
.field-paper .btn.ghost:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.field-ink .btn.ghost:hover,.field-accent .btn.ghost:hover{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.stack{display:flex;flex-direction:column;gap:18px}
.actions{max-width:360px}

/* section opener (cobalt band) */
.opener{padding-block:56px 52px}
.opener .sub{font-family:var(--read);font-style:italic;font-size:20px;line-height:1.45;margin:18px 0 0;max-width:var(--max)}

/* reading section */
.reading{padding-block:48px 64px}
.reading-grid{display:grid;gap:44px}
.block{padding-block:48px 56px}
.block + .block{border-top:3px solid var(--ink);padding-top:44px}

/* pull line */
.pull{border-left:4px solid var(--accent);padding-left:16px;margin:0}
.field-accent .pull{border-left-color:var(--paper)}
.pull p{margin:0}
.pull cite{display:block;margin-top:12px;font-style:normal}

/* stamp, used once on the site */
.stamp{display:inline-block;transform:rotate(-3deg);background:var(--accent);color:var(--paper);border:4px solid var(--paper);
  outline:3px solid var(--ink);padding:14px 18px 16px;max-width:300px}
.stamp .label{font-size:11px}
.stamp strong{display:block;font-family:var(--display);font-weight:900;font-stretch:90%;text-transform:uppercase;font-size:34px;line-height:.95;letter-spacing:.02em;margin-top:8px}

/* chips */
.chip{display:inline-block;border:2px solid currentColor;padding:4px 7px;font-family:var(--display);font-weight:900;font-size:11px;letter-spacing:.14em;text-transform:uppercase;line-height:1.2}

/* cards */
.cards{display:grid;gap:18px;grid-template-columns:1fr}
.card{display:flex;flex-direction:column;gap:12px;background:var(--paper);color:var(--ink);border:3px solid var(--ink);border-radius:4px;padding:20px 20px 22px;text-decoration:none;min-width:0;
  transition:background .12s,color .12s,border-color .12s,transform .06s}
.card h3{font-family:var(--display);font-weight:800;font-size:20px;line-height:1.22;margin:0;letter-spacing:0;text-wrap:balance}
.card p{margin:0;font-size:17px;line-height:1.5}
.card .meta{font-family:var(--read);font-style:italic;font-size:17px;line-height:1.45}
.card .go{margin-top:auto;padding-top:6px}
a.card:hover,a.card:focus-visible{background:var(--accent);color:var(--paper);border-color:var(--accent);outline:none}
a.card:active{transform:translateY(2px)}
.field-ink .card{border-color:var(--paper)}

/* started (black field) */
.started{padding-block:60px 72px}
.started .cards{margin-top:34px}

/* work list */
.work{padding-block:48px 72px}
.more{margin-top:40px;border-top:3px solid var(--ink)}
.toggle{list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:14px;padding:20px 0;min-height:52px}
.toggle::-webkit-details-marker{display:none}
.toggle .label{font-size:14px}
.sign{display:inline-grid;place-items:center;flex:none;width:34px;height:34px;border:3px solid currentColor;border-radius:4px;font-family:var(--display);font-weight:900;font-size:24px;line-height:1;transition:transform .22s,background .12s,color .12s,border-color .12s}
.toggle:hover .sign{background:var(--accent);border-color:var(--accent);color:var(--paper)}
details[open] > .toggle .sign{transform:rotate(45deg)}
.rows{list-style:none;margin:0;padding:0}
.rows li{padding:16px 0;border-top:1px solid rgba(10,10,10,.18);break-inside:avoid}
.rows h4{font-family:var(--display);font-weight:800;font-size:18px;line-height:1.3;margin:0}
.rows p{margin:4px 0 0;font-style:italic;font-size:17px;line-height:1.45}
.plus{margin:28px 0 8px;max-width:var(--max);font-size:18px}

/* back to top: nearly invisible */
.totop{display:grid;place-items:center;width:52px;height:52px;margin:44px 0 -28px auto;text-decoration:none;
  font-family:var(--display);font-weight:400;font-size:22px;line-height:1;opacity:.22;transition:opacity .12s}
.totop:hover,.totop:focus-visible{opacity:.9}

/* speaking */
.speaking{padding-block:60px 72px}
.speaking .grid{display:grid;gap:40px;margin-top:34px}
.speaking .photo{margin:0;border:4px solid var(--paper)}
.speaking .photo img{width:100%;aspect-ratio:10/7;object-fit:cover}

/* contact */
.contact{padding-block:60px 56px}
.contact .grid{display:grid;gap:44px;margin-top:40px}
.contact .who{font-size:20px;margin:14px 0 0}
.addr{font-family:var(--display);font-weight:700;font-size:clamp(18px,4.6vw,22px);letter-spacing:.01em;margin:6px 0 22px;word-break:break-word;user-select:all}
.foot{padding-block:28px calc(28px + env(safe-area-inset-bottom,0px));border-top:1px solid rgba(255,255,255,.18);margin-top:64px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px}
.foot .label{opacity:.7}
.foot .totop{margin:0}
.site-foot{padding-block:8px 0}
.site-foot .foot{margin-top:0;border-top:0}

/* subpages: categories (Insight Labs) */
.cat{border-top:3px solid var(--ink)}
.cat:last-of-type{border-bottom:3px solid var(--ink)}
.cat > .toggle{display:flex;justify-content:space-between;width:100%;padding:18px 0}
.cat > .toggle .cat-name{font-family:var(--display);font-weight:900;font-stretch:92%;text-transform:uppercase;letter-spacing:.02em;font-size:clamp(20px,4.6vw,26px);line-height:1.15}
.cat > .toggle .count{font-family:var(--display);font-weight:700;font-size:14px;opacity:.55;margin-left:10px;letter-spacing:.04em}
.sessions{list-style:none;margin:0 0 24px;padding:0}
.session{padding:22px 0;border-top:1px solid rgba(10,10,10,.18)}
.session h4{font-family:var(--display);font-weight:800;font-size:19px;line-height:1.3;margin:0}
.session .when{font-style:italic;font-size:17px;margin:4px 0 0}
.session .what{margin:10px 0 0;font-size:18px;line-height:1.55}
.who-toggle{list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:10px;margin-top:10px;min-height:44px}
.who-toggle::-webkit-details-marker{display:none}
.who-toggle .sign{width:24px;height:24px;font-size:17px;border-width:2px}
.who-toggle:hover .sign{background:var(--accent);border-color:var(--accent);color:var(--paper)}
.names{font-size:16px;line-height:1.6;margin:8px 0 0;max-width:var(--max)}

/* subpages: ranked list (SDGs) */
.ranked{list-style:none;margin:28px 0 0;padding:0}
.ranked li{display:grid;grid-template-columns:3.2em 1fr;gap:12px;align-items:baseline;padding:13px 0;border-top:1px solid rgba(10,10,10,.18);break-inside:avoid}
.ranked .n{font-family:var(--display);font-weight:900;font-size:17px;color:var(--accent);font-variant-numeric:tabular-nums;text-align:right}
.ranked .t{font-size:18px;line-height:1.45}
.ranked.top li{padding:16px 0}
.ranked.top .n{font-size:22px}
.ranked.top .t{font-family:var(--display);font-weight:800;font-size:20px;line-height:1.3}
.note{font-style:italic;font-size:17px;margin:24px 0 8px;max-width:var(--max)}
.names-list{font-size:16px;line-height:1.7;margin:8px 0 8px}

/* subpages: pillars (Stadiums) */
.pillars{display:grid;gap:18px;margin-top:34px}
.pillar{border:3px solid var(--paper);border-radius:4px;padding:22px 20px 24px}
.pillar h3{font-family:var(--display);font-weight:900;font-stretch:92%;text-transform:uppercase;letter-spacing:.02em;font-size:24px;line-height:1.1;margin:0 0 10px}
.pillar p{margin:0;font-size:18px}

/* subpages: report embed */
.embed{position:relative;width:100%;aspect-ratio:4/5;border:3px solid var(--ink);margin-top:28px;background:var(--neutral-soft)}
.embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* subpages: numbered principles (Planning) */
.principle{margin:44px 0 18px;display:grid;grid-template-columns:auto 1fr;gap:6px 14px;align-items:baseline}
.principle .n{font-family:var(--display);font-weight:900;font-size:clamp(26px,6vw,34px);color:var(--accent);line-height:1}
.principle h3{font-family:var(--display);font-weight:900;font-stretch:92%;text-transform:uppercase;letter-spacing:.02em;font-size:clamp(22px,5vw,28px);line-height:1.12;margin:0;text-wrap:balance}
.prose h2.subhead{margin:56px 0 22px}

/* 404 */
.mega.small .l1{font-size:clamp(34px,9vw,118px)}
.lost{padding-block:72px 96px;min-height:60vh}

/* phone: keep the four nav links on one row */
@media (max-width:519px){
  .topbar{row-gap:4px}
  .nav{gap:4px 12px;font-size:11px;letter-spacing:.08em;font-stretch:85%}
}

/* tablet */
@media (min-width:720px){
  :root{--pad:40px}
  .cards.two{grid-template-columns:repeat(2,minmax(0,1fr))}
  .rows{columns:2;column-gap:40px}
  .ranked.cols{columns:2;column-gap:40px}
  .contact .grid{grid-template-columns:1fr 1fr}
  .pillars{grid-template-columns:repeat(3,minmax(0,1fr))}
  .embed{aspect-ratio:16/10}
}
/* desktop */
@media (min-width:1100px){
  :root{--pad:56px}
  .hero{padding-block:72px 104px}
  .outline{-webkit-text-stroke:4px var(--paper)}
  .hero-body{display:grid;grid-template-columns:minmax(0,620px) 1fr;gap:56px;align-items:end}
  .hero .actions{margin:0 0 6px}
  .opener{padding-block:84px 76px}
  .reading{padding-block:72px 96px}
  .reading-grid{grid-template-columns:minmax(0,620px) 1fr;gap:80px;align-items:start}
  .reading-grid .side{padding-top:8px;position:sticky;top:40px}
  .started .cards{grid-template-columns:repeat(3,minmax(0,1fr))}
  .cards.two{grid-template-columns:repeat(4,minmax(0,1fr))}
  .speaking .grid{grid-template-columns:minmax(0,620px) 1fr;gap:80px;align-items:start}
  .embed{aspect-ratio:16/9;max-width:1000px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}