/* Atris Foundry. The one stylesheet for every page.
   Ink on paper, 1px rules, one condensed display face. Orange is the focus ring only. */

:root{
  --ink:#0b0b0a; --paper:#fdfdfc; --fog:#f1f1ef; --hair:#d9d9d4; --muted:#5b5b56;
  --dim:#c9c9c4; --night-rule:#4a4a46; --focus:#ff7f41; --desk-accent:#0b0b0a;
  --sans:"Instrument Sans",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
  --pad:28px; --gap:40px; --section:clamp(72px,10vw,120px);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 18px/1.5 var(--sans)}
a{color:inherit}
h1,h2,h3,p,ul,ol{margin:0}
ul,ol{list-style:none;padding:0}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px}
.wrap{max-width:1240px;margin:0 auto;padding:0 var(--pad)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:12px;z-index:20;background:var(--paper);padding:8px 12px;border:1.5px solid var(--ink)}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}

/* Header */
.top{position:sticky;top:0;z-index:10;background:var(--paper);border-bottom:1px solid var(--ink)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.mark{border:1.5px solid var(--ink);padding:5px 10px 6px;font-weight:500;line-height:1;text-decoration:none;white-space:nowrap}
.top nav{display:flex;align-items:center;gap:28px;font-weight:500;font-size:16px}
.top nav a:not(.btn){text-decoration:none}
.top nav a:not(.btn):hover,.top nav a[aria-current]{text-decoration:underline;text-underline-offset:4px}

/* Type: display, heading, body, small */
h1{font-weight:500;font-stretch:80%;font-size:clamp(50px,9.2vw,128px);line-height:.92;letter-spacing:-.035em;max-width:11.5em;text-wrap:balance}
h2{font-weight:500;font-stretch:85%;font-size:clamp(34px,4.2vw,56px);line-height:1;letter-spacing:-.03em;text-wrap:balance}
.lede{margin-top:28px;max-width:32em;text-wrap:balance;font-size:clamp(19px,1.8vw,22px);line-height:1.4;color:var(--muted)}
.big{font-weight:500;font-stretch:85%;font-size:clamp(26px,2.8vw,34px);line-height:1.05;letter-spacing:-.02em}
.small{font-size:15px;color:var(--muted)}

/* Actions */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 22px;background:var(--ink);color:var(--paper);border:1.5px solid var(--ink);border-radius:2px;font:500 17px/1.2 var(--sans);text-decoration:none;cursor:pointer;transition:background-color .15s ease}
.btn:hover{background:#2b2b28}
.btn:active{background:#000}
.btn:disabled{opacity:.5;cursor:default}
.btn.sm{min-height:42px;padding:0 16px;font-size:15px;white-space:nowrap}
.btn.light{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.btn.light:hover{background:var(--fog)}
.text-link{font-weight:500;text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:1.5px}

/* Page skeleton */
.hero{padding:88px 0 var(--section)}
.hero .btn{margin-top:36px}
section{padding:var(--section) 0;border-top:1px solid var(--ink)}
.split{display:grid;grid-template-columns:4fr 8fr;gap:var(--gap)}
.rows{border-top:1px solid var(--ink)}
.rows>li{padding:16px 0;border-bottom:1px solid var(--hair)}
.pair>li{display:grid;grid-template-columns:4fr 8fr;gap:var(--gap)}
.pair>li>:first-child{font-weight:500}
.pair>li>:last-child{color:var(--muted)}
.prose>*+*{margin-top:16px}
.prose h2{margin-top:56px;font-size:clamp(28px,3vw,36px)}
.prose p,.prose li{max-width:40em}

/* Two paths. Each is a route of four stops; both end at Demo Day. */
.paths .path{align-items:start}
.paths .path+.path{margin-top:clamp(48px,6vw,72px);padding-top:clamp(48px,6vw,72px);border-top:1px solid var(--hair)}
.route{display:grid;grid-template-columns:repeat(4,1fr)}
.route li{position:relative;padding:36px 20px 0 0;font-weight:500;font-stretch:85%;font-size:clamp(21px,2vw,26px);line-height:1.15;letter-spacing:-.015em;text-wrap:balance}
.route li::before{content:"";position:absolute;top:0;left:0;z-index:1;width:15px;height:15px;border:1.5px solid var(--ink);border-radius:50%;background:var(--paper)}
.route li::after{content:"";position:absolute;top:7px;left:0;right:0;height:1.5px;background:var(--ink)}
.route li:last-child::before{background:var(--ink)}
.route li:last-child::after{display:none}

/* Class calendar: Monday and Wednesday columns, Demo Day across the bottom */
.cal{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--ink)}
.cal>*{padding:14px 0 16px;border-bottom:1px solid var(--hair)}
.cal>:nth-child(even){padding-left:24px;border-left:1px solid var(--hair)}
.cal s{color:var(--muted);text-decoration-thickness:2px}
.cal .demo{grid-column:1/-1;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:8px 24px;margin-top:16px;padding:22px 24px;background:var(--ink);color:var(--paper);border:0}

/* Questions */
.faq details{border-bottom:1px solid var(--hair)}
.faq{border-top:1px solid var(--ink)}
.faq summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;gap:24px;padding:18px 0;font-weight:500;font-size:20px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:26px;line-height:.9}
.faq details[open] summary::after{content:"\2212"}
.faq details p{padding:0 0 20px;color:var(--muted);max-width:38em}

/* Enroll band */
.enroll{background:var(--ink);color:var(--paper);border-top:0}
.enroll .split{grid-template-columns:1fr 1fr}
.price{font-weight:500;font-stretch:80%;font-size:clamp(84px,12vw,168px);line-height:.85;letter-spacing:-.04em}
.enroll h2{margin-top:24px;font-size:clamp(28px,3vw,40px)}
.enroll .rows{border-color:var(--night-rule)}
.enroll .rows>li{border-color:var(--night-rule)}
.enroll .rows>li:first-child{font-weight:500}
.enroll .btn{width:100%;margin-top:28px}
.signup{display:flex;flex-wrap:wrap;gap:10px;margin-top:56px;padding-top:28px;border-top:1px solid var(--night-rule)}
.signup input{flex:1 1 220px;min-width:0;min-height:52px;padding:0 14px;border:1.5px solid #6b6b66;border-radius:2px;background:transparent;color:var(--paper);font:400 17px var(--sans)}
.signup input::placeholder{color:#a3a39e}
.signup .btn{width:auto;margin-top:0}
.signup-msg{min-height:24px;margin-top:10px;color:var(--dim);font-size:15px}

/* Footer */
footer{padding:36px 0 120px;font-size:15px;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 28px}
footer nav{display:flex;flex-wrap:wrap;gap:8px 22px}

@media (max-width:900px){
  .split,.enroll .split{grid-template-columns:1fr}
  .split{gap:28px}
}
@media (max-width:640px){
  :root{--pad:20px;--gap:20px}
  .hero{padding-top:56px}
  .hero .btn{width:100%}
  .pair>li{grid-template-columns:1fr;gap:2px}
  .cal>:nth-child(even){padding-left:16px}
  .faq summary{font-size:18px}
  .route{grid-template-columns:1fr}
  .route li{padding:0 0 26px 34px}
  .route li:last-child{padding-bottom:0}
  .route li::before{top:5px}
  .route li::after{top:5px;bottom:-5px;left:7px;right:auto;width:1.5px;height:auto}
}
@media (max-width:379px){
  .top nav a:not(.btn){display:none}
  h1{font-size:44px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* Pages whose hero is only a heading sit closer to their content */
.hero:not(:has(.lede)){padding-bottom:clamp(40px,6vw,64px)}
.hero:not(:has(.lede))+section{padding-top:clamp(40px,6vw,64px)}

/* Syllabus: one row per class, the date then the two tracks */
.plan li{display:grid;grid-template-columns:120px 1fr 1fr;gap:0 var(--gap);padding:14px 0;border-bottom:1px solid var(--hair)}
.plan time,.plan b{font-weight:500}
.plan p{text-wrap:pretty}
.plan .plan-head{position:sticky;top:68px;z-index:1;background:var(--paper);border-bottom:1px solid var(--ink)}
.plan .off p{grid-column:2/-1;color:var(--muted)}
.plan .demo{font-weight:500}
@media (max-width:640px){
  .plan li{grid-template-columns:1fr 1fr}
  .plan li>:first-child{grid-column:1/-1;margin-bottom:6px}
  .plan .plan-head span{display:none}
  .plan .off p{grid-column:1/-1}
}