/* North Star Therapeutics: one plain black-and-white look for every page of the site */
:root{
  --paper:#ffffff; --ink:#000000; --body:#1d1d1f; --dim:#6e6e73; --hair:#e5e5e7; --soft:#f5f5f7;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","Inter","Helvetica Neue",Arial,sans-serif;
  --pad:clamp(22px,5vw,72px); --max:1120px;
  --sky:#121418; --skyrgb:18,20,24; --starb:.55;
  color-scheme:light dark;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{background:var(--paper);color:var(--body);font-family:var(--sans);font-size:17px;line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--pad)}

/* top bar */
.top{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.86);-webkit-backdrop-filter:saturate(1.4) blur(16px);backdrop-filter:saturate(1.4) blur(16px);border-bottom:1px solid var(--hair)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand .mk{display:block;width:25px;height:34px;background:currentColor;-webkit-mask:url(logo.svg) center/contain no-repeat;mask:url(logo.svg) center/contain no-repeat}
.brand .nm{font-weight:600;font-size:17px;letter-spacing:-.01em}
.brand .nm span{color:var(--dim);font-weight:400}
.nav{display:flex;gap:clamp(14px,2.4vw,32px);font-size:14px}
.nav a{text-decoration:none;color:var(--body)}
.nav a:hover{color:var(--ink)}

/* sections */
section{padding:clamp(64px,10vw,140px) 0;border-bottom:1px solid var(--hair)}
.kicker{font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
h1{font-size:clamp(40px,7vw,88px);line-height:1.02;letter-spacing:-.035em;font-weight:600;color:var(--ink);max-width:14ch}
h2{font-size:clamp(30px,4.2vw,52px);line-height:1.08;letter-spacing:-.025em;font-weight:600;color:var(--ink);max-width:20ch;margin-top:14px}
.lead{font-size:clamp(18px,1.7vw,22px);line-height:1.5;color:var(--body);max-width:40em;margin-top:22px}
p+p{margin-top:14px}
.hero{padding-top:clamp(80px,14vw,180px)}
.hero .lead{max-width:34em}

/* four tiers */
.tiers{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:clamp(36px,5vw,64px);border-top:1px solid var(--ink)}
.tier{padding:22px 22px 6px 0}
.tier+.tier{padding-left:22px;border-left:1px solid var(--hair)}
.tier .n{font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--dim)}
.tier h3{font-size:21px;line-height:1.2;letter-spacing:-.01em;font-weight:600;color:var(--ink);margin-top:8px}
.tier p{font-size:15px;color:var(--body);margin-top:8px}
.note{font-size:14px;color:var(--dim);margin-top:28px;max-width:46em}

/* buttons and form */
.btn{display:inline-block;margin-top:28px;background:var(--ink);color:#fff;text-decoration:none;font-size:15px;font-weight:500;padding:13px 22px;border-radius:999px;border:0;cursor:pointer;font-family:inherit}
.btn:hover{background:#222}
form{margin-top:32px;max-width:640px;display:grid;gap:14px}
label{font-size:13px;font-weight:600;color:var(--body)}
input,textarea{width:100%;font:inherit;font-size:16px;color:var(--ink);background:var(--soft);border:1px solid transparent;border-radius:12px;padding:13px 14px;margin-top:6px}
input:focus,textarea:focus{outline:none;border-color:var(--ink);background:#fff}
textarea{min-height:150px;resize:vertical}
.fine{font-size:13px;color:var(--dim)}

/* footer */
footer{padding:40px 0 56px;font-size:13px;color:var(--dim)}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between}
footer a{text-decoration:none}
footer a:hover{color:var(--ink)}
footer .links{display:flex;gap:20px}

/* button rows, tier pills */
.btns{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.btns .btn{margin-top:0}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.btn.ghost:hover{background:var(--soft)}
.pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:26px}
.pills span{font-size:14px;padding:8px 14px;border:1px solid var(--hair);border-radius:999px;color:var(--body)}

/* approach page */
.essay{margin-top:30px;max-width:36em}
.essay p{font-size:clamp(17px,1.5vw,20px);line-height:1.55;color:var(--body)}
.essay p+p{margin-top:18px}
.essay p:first-child{color:var(--ink)}
.goals{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:36px}
.goal{border:1px solid var(--hair);border-radius:18px;padding:clamp(22px,3vw,34px)}
.goal h3{font-size:clamp(22px,2.4vw,30px);line-height:1.15;letter-spacing:-.02em;font-weight:600;color:var(--ink);margin-top:10px}
.goal p{margin-top:10px}
.essay + .goals{margin-top:clamp(48px,7vw,88px)}
.body .goals{gap:clamp(28px,5vw,64px)}
.body .goal{border:0;border-radius:0;padding:0;background:none}
.body .goal h3{font-size:clamp(18px,1.6vw,21px);line-height:1.25;margin-top:8px}
.body .goal p{font-size:15px;line-height:1.55;margin-top:8px;color:var(--body)}
.tierblock{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,2fr);gap:28px;padding:30px 0;border-top:1px solid var(--hair)}
.plan h2 + .tierblock{border-top:1px solid var(--ink);margin-top:36px}
.tierblock h3{font-size:24px;line-height:1.2;letter-spacing:-.015em;font-weight:600;color:var(--ink);margin-top:6px}
.tierblock .tl{font-size:15px;color:var(--dim);margin-top:6px}
.steps{display:grid;gap:20px}
.steps h4{font-size:18px;font-weight:600;color:var(--ink);margin-top:4px}
.steps p{font-size:16px;margin-top:4px;max-width:40em}

/* home: a living night-sky hero, then one plain section, no dividers */
section{border-bottom:0}
footer{border-top:0}
body.home .top.over{position:absolute;left:0;right:0;top:0;background:transparent;border-bottom:0;-webkit-backdrop-filter:none;backdrop-filter:none}
body.home .top.over .brand,body.home .top.over .nav a{color:#fff}
body.home .top.over .brand .nm span{color:rgba(255,255,255,.6)}
.sky{position:relative;min-height:100vh;background:var(--sky);color:#fff;display:flex;align-items:center;padding:110px 0 80px;overflow:hidden}
@supports(min-height:100svh){.sky{min-height:100svh}}
.sky canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.sky::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(var(--skyrgb),.72) 0%,rgba(var(--skyrgb),.35) 45%,rgba(var(--skyrgb),0) 70%);pointer-events:none}
.sky .skytext{position:relative;z-index:1}
.sky .kicker{color:rgba(255,255,255,.6)}
.sky h1{color:#fff;margin-top:16px}
.sky .lead{color:rgba(255,255,255,.82)}
.btn.light{background:#fff;color:#000}
.btn.light:hover{background:#e8e8ea}
.btn.ghost.light{background:transparent;color:#fff;box-shadow:inset 0 0 0 1px rgba(255,255,255,.6)}
.btn.ghost.light:hover{background:rgba(255,255,255,.08)}
/* the plan: the section holds the screen while scrolling; each step shows its own 3D loop */
.plan3d{position:relative;height:460vh;background:#fffefa}
.plan3d .stick{position:sticky;top:0;height:100vh;overflow:hidden;display:flex;align-items:center}
@supports(height:100svh){.plan3d .stick{height:100svh}}
.plan3d .wrap{max-width:1240px}
.plan3d .pin{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(24px,4vw,72px);align-items:center;width:100%}
.plan3d .caps{position:relative;min-height:17em}
.plan3d .cap{position:absolute;left:0;right:0;top:50%;opacity:0;transform:translateY(-44%);transition:opacity .25s ease,transform .25s ease;pointer-events:none}
.plan3d .cap.on{opacity:1;transform:translateY(-50%);transition:opacity .45s ease .25s,transform .6s ease .25s}
.plan3d .cap h2{margin-top:12px}
.plan3d .cap p{font-size:clamp(17px,1.6vw,21px);line-height:1.5;margin-top:14px;max-width:24em}
.plan3d .cap .fine{font-size:13px;color:var(--dim);margin-top:18px}
.plan3d .vids{position:relative;aspect-ratio:1/1;--bleed:calc(max(0px,(100vw - 1240px) / 2) + var(--pad));width:min(92vh,calc(100% + var(--bleed)));margin-right:calc(-1 * var(--bleed));justify-self:end}
.plan3d video,.plan3d .vids img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .7s ease;background:#fffefa}
.plan3d video.on,.plan3d .vids img.on{opacity:1}
.plan3d canvas.seq{position:absolute;inset:0;width:100%;height:100%;display:block;background:#fffefa}
.plan3d.full .vids{position:absolute;inset:0;width:auto;max-width:none;aspect-ratio:auto;margin:0;justify-self:stretch;align-self:stretch;z-index:0}
.plan3d.full .caps{z-index:1}
.plan3d .dotsw{position:absolute;left:0;right:0;bottom:6vh;z-index:1}
.plan3d .dots{display:flex;gap:8px}
.plan3d .dots i{width:24px;height:2px;border-radius:2px;background:#d2d2d7;transition:background .4s}
.plan3d .dots i.on{background:var(--ink)}
.team{padding-top:clamp(90px,12vw,160px)}
@media(max-width:700px){
  .plan3d .stick{align-items:flex-start;padding-top:70px}
  .plan3d .pin{grid-template-columns:1fr;gap:14px}
  .plan3d .vids{order:-1;width:100vw;max-width:none;margin-left:calc(50% - 50vw);margin-right:0;justify-self:start}
  .plan3d .caps{min-height:14em}
  .plan3d .cap{top:0;transform:translateY(12px)}
  .plan3d .cap.on{transform:none}
  .plan3d.full .stick{align-items:flex-end;padding-top:0;padding-bottom:calc(6vh + 30px)}
}
@media(max-width:560px){
  .duo,.quad{grid-template-columns:1fr}
  .sky{align-items:flex-end}
  .sky::after{background:linear-gradient(180deg,rgba(var(--skyrgb),.15) 0%,rgba(var(--skyrgb),.6) 50%,rgba(var(--skyrgb),.78) 100%)}
}

/* legal pages */
.legal{padding-top:clamp(56px,8vw,96px)}
.legal h1{font-size:clamp(34px,5vw,56px);max-width:none}
.legal h2{font-size:22px;letter-spacing:-.01em;margin-top:40px;max-width:none}
.legal p,.legal li{font-size:16px;max-width:42em}
.legal ul{margin:12px 0 0 20px}
.legal li+li{margin-top:6px}
.draft{background:var(--soft);border-left:3px solid var(--ink);padding:14px 16px;font-size:14px;margin-top:24px;max-width:46em}
.ph{background:#fff3c4;padding:0 4px;border-radius:3px}

@media(max-width:760px){
  .goals{grid-template-columns:1fr}
  .tierblock{grid-template-columns:1fr;gap:14px}
}
@media(max-width:860px){
  .tiers{grid-template-columns:1fr 1fr}
  .tier:nth-child(3){padding-left:0;border-left:0}
  .tier:nth-child(n+3){border-top:1px solid var(--hair)}
}
@media(max-width:560px){
  .nav a.opt{display:none}
  .tiers{grid-template-columns:1fr}
  .tier,.tier+.tier{padding:20px 0 6px;border-left:0}
  .tier+.tier{border-top:1px solid var(--hair)}
}

/* the plan, in words, until the 3D sequence is ready */
.steps4{padding-top:clamp(40px,6vw,80px)}
.s4{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(24px,3.5vw,56px);margin-top:clamp(28px,4vw,48px)}
.s4 .n{font-size:clamp(34px,3.6vw,52px);font-weight:600;letter-spacing:-.03em;color:#d2d2d7;line-height:1}
.s4 h3{font-size:clamp(20px,1.9vw,26px);line-height:1.15;letter-spacing:-.02em;font-weight:600;color:var(--ink);margin-top:14px}
.s4 p{font-size:16px;margin-top:10px;max-width:22em}
@media(max-width:860px){ .s4{grid-template-columns:1fr 1fr} }
@media(max-width:560px){ .s4{grid-template-columns:1fr} }

/* dark mode: a lighter night sky over black pages; the plan keeps its light stage, its frames are rendered on white */
@media(prefers-color-scheme:dark){
  :root{--paper:#000000; --ink:#f5f5f7; --body:#d2d2d7; --dim:#86868b; --hair:#2c2c2e; --soft:#1c1c1e; --sky:#1f2536; --skyrgb:31,37,54; --starb:.85}
  .top{background:rgba(22,22,23,.8)}
  .btn{color:#000}
  .btn:hover{background:#d2d2d7}
  input:focus,textarea:focus{background:#000}
  .s4 .n{color:#3a3a3c}
  .plan3d:not(.darkset){--paper:#ffffff; --ink:#000000; --body:#1d1d1f; --dim:#6e6e73; --hair:#e5e5e7; --soft:#f5f5f7; color:var(--body); color-scheme:light}
  .plan3d.darkset,.plan3d.darkset canvas.seq{background:#000}
  .plan3d.darkset .dots i{background:#3a3a3c}
  .plan3d.darkset .dots i.on{background:var(--ink)}
}