/* headingos.com: one stylesheet for every page. */
:root{
  --paper:#15171B; --ink:#ECEBE6; --muted:#A3A6AE; --rule:#2C2F35;
  --rust:#E0703F; --rust-ink:#F08A5C; --term:#1D2025; --on-rust:#15171B;
  --serif:"Source Serif 4",Georgia,serif;
  --sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",monospace;
  --wide:1180px; --text:65ch;
}
:root[data-theme="light"]{--paper:#FAFAF7;--ink:#16181D;--muted:#5A5F6B;--rule:#DCDDD8;--rust:#B4410F;--rust-ink:#8E3209;--term:#EEF0EF;--on-rust:#FFFFFF}
:root[data-theme="dark"]{--paper:#15171B;--ink:#ECEBE6;--muted:#A3A6AE;--rule:#2C2F35;--rust:#E0703F;--rust-ink:#F08A5C;--term:#1D2025;--on-rust:#15171B}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html,body{margin:0;background:var(--paper);color:var(--ink)}
body{font:18px/1.6 var(--sans)}
a{color:inherit;text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{color:var(--rust-ink)}
:focus-visible{outline:2px solid var(--rust);outline-offset:3px}
img,svg{max-width:100%;height:auto}
code,kbd{font:0.88em/1.4 var(--mono)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:12px;background:var(--paper);padding:6px 10px;z-index:9}

.wrap{max-width:var(--wide);margin:0 auto;padding:0 32px}

/* header and footer */
header.site{display:flex;align-items:center;gap:40px;padding:14px 0;min-height:64px;position:sticky;top:0;z-index:10;background:var(--paper);box-shadow:0 0 0 100vmax var(--paper);clip-path:inset(0 -100vmax);border-bottom:1px solid transparent;transition:border-color .2s}
header.site.scrolled{border-bottom-color:var(--rule)}
[id]{scroll-margin-top:110px}
.mark{font:600 19px/1 var(--serif);letter-spacing:.04em;text-decoration:none;display:inline-flex;align-items:center;gap:12px;color:var(--ink)}
.mark:hover{color:var(--ink)}
.mark span{padding-top:2px}
.mark img{display:block;height:34px;width:auto;margin-top:-2px}
nav.main{display:flex;gap:28px;font-size:15px;line-height:1;color:var(--muted);flex-wrap:wrap;align-items:center}
nav.main a{text-decoration:none}
nav.main a:hover,nav.main a[aria-current="page"]{color:var(--ink)}
nav.main a[aria-current="page"]{text-decoration:underline;text-underline-offset:6px}
.theme{margin-left:auto;line-height:1;font:14px/1 var(--sans);color:var(--muted);background:none;border:1px solid var(--rule);border-radius:2px;padding:6px 10px;cursor:pointer}
footer.site{border-top:1px solid var(--rule);margin-top:96px;padding:32px 0 48px;font-size:14px;color:var(--muted)}
footer.site .cols{display:flex;gap:48px;flex-wrap:wrap;justify-content:space-between}
footer.site ul{list-style:none;margin:0;padding:0;display:flex;gap:20px;flex-wrap:wrap}
footer.site p{margin:0 0 6px;max-width:60ch}

/* type */
h1{font:400 clamp(40px,5.4vw,68px)/1.06 var(--serif);letter-spacing:-.015em;margin:0 0 28px;max-width:14ch}
h1.long{font-size:clamp(34px,4.1vw,56px);max-width:none}
h2{font:400 clamp(28px,3vw,38px)/1.15 var(--serif);letter-spacing:-.01em;margin:0 0 20px;max-width:24ch}
h1,h2{text-wrap:balance}
h3{font:600 19px/1.35 var(--sans);margin:32px 0 8px}
p{margin:0 0 18px;max-width:var(--text)}
.lede{font-size:19px;line-height:1.55;max-width:46ch;margin:0 0 36px}
.muted{color:var(--muted)}
em.hl{font-style:normal;color:var(--rust-ink)}
h1 em.hl,h2 em.hl,h3 em.hl{color:var(--rust)}
.small{font-size:14px}

/* page sections */
section.band{padding:88px 0;border-top:1px solid var(--rule)}
section.band:first-of-type{border-top:0}
.split{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:72px;align-items:start}
.split > h2,.split > .side{position:sticky;top:112px}
.page-head{padding:12vh 0 48px}
.page-head p{font-size:19px;max-width:52ch}
.prose{max-width:var(--text)}
.prose ul,.prose ol{padding-left:1.2em;max-width:var(--text)}
.prose li{margin:0 0 8px}
.prose figure.screen{margin-top:24px}
#h-tasks ~ div figure.screen{--kw:7ch}
.prose ul.links{list-style:none;padding:0;margin:24px 0 0;display:flex;flex-wrap:wrap;gap:12px 28px;font-size:15px}
.prose ul.links li{margin:0}
.prose ul.links a::after{content:" \2197";color:var(--muted)}

/* hero */
.hero{display:grid;grid-template-columns:minmax(0,11fr) minmax(0,10fr);gap:72px;align-items:center;padding:11vh 0 13vh}
.hero .term{font-size:14px;padding:26px 28px;margin-top:0}

/* waitlist form */
form.waitlist{display:flex;gap:8px;max-width:440px;flex-wrap:wrap}
form.waitlist input[type=email]{flex:1 1 220px;min-width:0;font:inherit;color:var(--ink);background:transparent;border:1px solid var(--ink);border-radius:2px;padding:11px 14px}
form.waitlist input::placeholder{color:var(--muted)}
form.waitlist .hp{position:absolute;left:-9999px}
button.join,a.join{font:500 16px/1 var(--sans);color:var(--on-rust);background:var(--rust);border:0;border-radius:2px;padding:14px 20px;cursor:pointer;text-decoration:none;display:inline-block}
button.join:hover,a.join:hover{background:var(--rust-ink);color:var(--on-rust)}
.choice{display:flex;gap:18px;font-size:15px;color:var(--muted);margin:12px 0 0;flex-basis:100%;border:0;padding:0}
.choice legend{float:left;margin-right:8px;padding:0}
.done{font-size:15px;color:var(--rust-ink);margin:10px 0 0;min-height:1.2em}
.status{font-size:15px;color:var(--muted);margin:4px 0 0;max-width:440px;text-wrap:balance}

/* terminal */
.term{background:var(--term);border:1px solid var(--rule);border-radius:3px;padding:20px 22px;font:14px/1.75 var(--mono);color:var(--ink);overflow-x:auto;margin-top:10px}
.term p{margin:0;white-space:pre-wrap;max-width:none}
.term .you{font-weight:500}
.term .you::before{content:"› ";color:var(--muted)}
.term .out{color:var(--muted);padding-left:2ch}
.term .gate{color:var(--rust-ink);padding-left:2ch}
.term .gap{height:.9em}
.term p.row{white-space:pre}
.caption{font-size:14px;color:var(--muted);margin:10px 0 0}

/* figures with sources */
.facts{list-style:none;margin:0;padding:0;max-width:var(--text)}
.facts li{padding:18px 0;border-top:1px solid var(--rule)}
.facts li:last-child{border-bottom:1px solid var(--rule)}
.facts cite{display:block;font-style:normal;font-size:14px;color:var(--muted);margin-top:4px}

/* a day */
.day{list-style:none;margin:0;padding:0}
.day li{display:grid;grid-template-columns:7ch minmax(0,1fr);gap:24px;padding:22px 0;border-top:1px solid var(--rule)}
.day time{font:400 22px/1.2 var(--serif);color:var(--muted)}
.day .say{font:14px/1.6 var(--mono);margin:0 0 6px}
.day .say::before{content:"› ";color:var(--muted)}

/* guarantees */
.three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:40px;margin-top:8px}
.three h3{margin-top:0;font:400 22px/1.3 var(--serif)}

/* diagram */
figure.diagram{margin:8px 0 0}
figure.diagram svg text{font:13px var(--sans);fill:var(--ink)}
figure.diagram svg .m{fill:var(--muted)}
figure.diagram svg .box{fill:none;stroke:var(--ink);stroke-width:1}
figure.diagram svg .line{stroke:var(--muted);stroke-width:1;fill:none}
figure.diagram svg .live{fill:none;stroke:var(--rust);stroke-width:1.5}
figure.diagram svg .dot{fill:var(--rust)}
figcaption{font-size:14px;color:var(--muted);margin-top:8px}

/* tables and lists on inner pages */
table.plain{border-collapse:collapse;width:100%;max-width:880px;font-size:15px;margin:8px 0 24px}
table.plain th,table.plain td{text-align:left;vertical-align:top;padding:12px 10px 12px 0;border-top:1px solid var(--rule)}
table.plain th{font-weight:500}
table.plain td code{font-size:13px}
.releases{list-style:none;margin:0;padding:0;max-width:880px}
.releases li{display:grid;grid-template-columns:9ch 11ch minmax(0,1fr);gap:16px;padding:14px 0;border-top:1px solid var(--rule)}
.releases .v{font:500 15px/1.5 var(--mono)}
.releases time{color:var(--muted);font-size:15px}


/* product frames: a window around invented, real-shaped output */
figure.screen{margin:0;border:1px solid var(--rule);border-radius:3px;background:var(--term);overflow:hidden}
figure.screen .bar{display:flex;align-items:center;gap:6px;padding:10px 14px;border-bottom:1px solid var(--rule);font:12.5px/1.2 var(--mono);color:var(--muted)}
figure.screen .bar i{width:8px;height:8px;border-radius:50%;background:var(--rule);display:block}
figure.screen .bar span{margin-left:8px}
figure.screen .body{padding:18px 20px;font:14px/1.7 var(--mono)}
figure.screen .body p{margin:0;max-width:none;white-space:pre-wrap;padding-left:var(--kw,12.5ch);text-indent:calc(-1 * var(--kw,12.5ch))}
figure.screen .k{display:inline-block;width:var(--kw,12.5ch);text-indent:0;color:var(--muted)}
figure.screen .hot{color:var(--rust-ink)}
figure.screen + figcaption,.side figcaption{margin-top:10px}
.side h2{margin-bottom:32px}
.term.inline{margin:24px 0 8px}
figure.diagram.wide{margin:32px 0 8px}
.page-head.with-art{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:64px;align-items:center}
.page-head.with-art img{height:240px;width:auto;margin-right:24px}

/* task board */
figure.board{margin:28px 0 0}
figure.board .cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
figure.board .col{background:var(--term);border:1px solid var(--rule);border-radius:3px;padding:12px 10px 10px;min-height:236px}
figure.board .h{margin:0;font:600 14px/1.2 var(--sans);display:flex;justify-content:space-between}
figure.board .h span{font:400 12px/1.2 var(--mono);color:var(--muted)}
figure.board .sub{margin:4px 0 12px;font-size:12.5px;line-height:1.3;color:var(--muted)}
figure.board ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
figure.board .card{margin:0;padding:9px 10px;border:1px solid var(--rule);border-radius:2px;background:var(--paper);display:grid;gap:4px}
figure.board .card .t{font-size:14px;line-height:1.35}
figure.board .card .who{font:12px/1.35 var(--mono);color:var(--muted)}
figure.board .card .note{font:12px/1.35 var(--mono);color:var(--rust-ink)}
figure.board .card.focus{border-color:var(--rust)}
figure.board figcaption{margin-top:10px}

@media (prefers-reduced-motion:no-preference){
  .hero .term p{opacity:0;animation:line .01s linear forwards}
  .hero .term p:nth-child(1){animation-delay:.2s}.hero .term p:nth-child(2){animation-delay:.9s}
  .hero .term p:nth-child(3){animation-delay:1.3s}.hero .term p:nth-child(4){animation-delay:1.7s}
  .hero .term p:nth-child(5){animation-delay:2.1s}.hero .term p:nth-child(6){animation-delay:2.5s}
  .hero .term p:nth-child(7){animation-delay:3.3s}
  @keyframes line{to{opacity:1}}
}
@media (max-width:900px){
  .wrap{padding:0 20px}
  .hero,.split{grid-template-columns:minmax(0,1fr);gap:40px}
  .split > h2,.split > .side{position:static}
  .page-head.with-art{grid-template-columns:1fr}
  .page-head.with-art img{display:none}
  .hero .term{font-size:13.5px;padding:20px}
  .hero{padding:8vh 0 10vh}
  .three{grid-template-columns:1fr}
  header.site{flex-wrap:wrap;gap:16px}
  nav.main{order:3;flex-basis:100%;gap:18px;flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;padding-bottom:2px}
  nav.main a{white-space:nowrap}
  header.site{gap:12px 16px;padding:10px 0}
  [id]{scroll-margin-top:120px}
  section.band{padding:64px 0}
  .releases li{grid-template-columns:8ch 1fr}
  .releases li span{grid-column:1 / -1}
  figure.board .cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  figure.board .col{min-height:0}
  figure.diagram{overflow-x:auto;scrollbar-color:var(--rule) transparent;scrollbar-width:thin}
  figure.diagram svg{min-width:520px}
}