:root{
  --paper:#FFFFFF;--canvas:#FAFAF8;--surface:#F2F2EE;--border:#E7E7E2;--mute:#9C9C95;--ink-2:#5C5C58;--ink:#0A0A0A;
  --plum:oklch(.50 .065 355);--plum-700:oklch(.40 .07 355);--plum-50:oklch(.96 .015 355);--plum-200:oklch(.78 .05 355);
  --blush-50:oklch(.97 .015 30);--sand-50:oklch(.96 .022 85);
  --gut:clamp(28px,7vw,128px);--t:220ms cubic-bezier(.2,.7,.3,1);--t-fast:140ms cubic-bezier(.2,.7,.3,1);--out:cubic-bezier(.16,1,.3,1);
}
*{box-sizing:border-box}
html{overflow-x:clip}
html,body{margin:0;padding:0;background:var(--canvas)}
body{font-family:'Geist',-apple-system,system-ui,sans-serif;color:var(--ink);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{display:block;max-width:100%}
a{color:var(--ink);text-decoration:none}
a:hover{color:var(--plum)}
button{font:inherit;color:inherit;background:none;border:none;padding:0;cursor:pointer}
.mono{font-family:'Geist Mono',monospace;text-transform:uppercase;letter-spacing:.16em;font-size:11px}
.arrow{width:16px;height:16px;flex:none;stroke:currentColor;fill:none;stroke-width:1.7}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ── nav (from the landing page) ─────────────── */
.nav{position:fixed;top:0;left:0;right:0;z-index:200;height:84px;display:flex;align-items:center;justify-content:space-between;padding:0 28px;background:color-mix(in oklab,var(--canvas) 82%,transparent);backdrop-filter:blur(18px) saturate(160%);-webkit-backdrop-filter:blur(18px) saturate(160%);border-bottom:1px solid transparent;transition:border-color var(--t)}
.nav--scrolled{border-color:var(--border)}
.nav-brand{display:flex;align-items:center}
.brand-mark{display:block;height:19px;width:157px;background:#885670;transition:background var(--t);-webkit-mask:url(assets/buttafly-wordmark-plum.png) no-repeat center/contain;mask:url(assets/buttafly-wordmark-plum.png) no-repeat center/contain;transition:background var(--t)}
.nav-brand:hover .brand-mark{background:#6E4459}
@media (max-width:560px){.brand-mark{height:15px;width:124px}}
.nav-right{display:flex;align-items:center;gap:28px}
.nav-mid{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:flex;gap:clamp(14px,2vw,26px)}
.nav-mlink{font-size:13.5px;font-weight:500;color:var(--ink-2);letter-spacing:-.01em;transition:color var(--t-fast)}
.nav-mlink:hover{color:var(--ink)}
.nav-link{font-size:15px;font-weight:500;color:var(--ink-2);transition:color var(--t-fast)}
.nav-link:hover{color:var(--ink)}
.nav .i-up{transition-delay:900ms}
.nav .nav-right.i-up{transition-delay:980ms}

.pbar{position:fixed;left:0;top:0;right:0;height:3px;z-index:210;background:transparent;pointer-events:none}
.pbar span{display:block;height:100%;width:0;background:#885670;box-shadow:0 0 12px -2px color-mix(in oklab,#885670 60%,transparent)}

/* ── reveal ─────────────────────────────────── */
.hl{display:inline-block;opacity:0;transform:translateY(.34em) scale(.99);filter:blur(9px);transition:transform 1150ms var(--out),opacity 760ms ease,filter 900ms ease;transition-delay:140ms}
body.is-ready .hl{opacity:1;transform:none;filter:blur(0)}
.i-up{opacity:0;transform:translateY(20px);filter:blur(6px);transition:opacity 900ms ease,transform 1100ms var(--out),filter 900ms ease}
body.is-ready .intro .i-up,.rv.rv--in .i-up,.rv.rv--in.i-up{opacity:1;transform:none;filter:blur(0)}
.intro-say.i-up,.intro-say .i-up{transition-delay:560ms}
.scroll-cue.i-up{transition-delay:820ms}
.rv .i-up:nth-child(2){transition-delay:90ms}
.rv .i-up:nth-child(3){transition-delay:180ms}

/* ── chapter ────────────────────────────────── */
.ch{position:relative}
.ch--intro{display:flex;align-items:center;padding:132px var(--gut) 92px}
.intro{width:100%}
.ch-word{font-weight:600;line-height:.78;letter-spacing:-.055em;margin:0 0 0 -.045em;font-size:clamp(58px,13.2vw,214px)}
.ch-word.hero{margin-bottom:22px}
.intro-say{max-width:420px}
.intro-say h2{margin:0 0 12px;font-size:clamp(18px,1.6vw,22px);font-weight:600;line-height:1.26;letter-spacing:-.02em}
.intro-say h2 em{font-style:normal;color:var(--plum)}
.intro-say p{margin:0;font-size:15px;line-height:1.45;color:var(--mute);max-width:360px}
.scroll-cue{display:flex;align-items:center;gap:14px;margin:38px 0 0;color:var(--mute)}
.cue-line{display:block;width:64px;height:1px;background:var(--border);position:relative;overflow:hidden}
.cue-line::after{content:'';position:absolute;inset:0;background:var(--plum);transform:translateX(-100%);animation:cue 2.6s cubic-bezier(.6,0,.4,1) infinite}
@keyframes cue{0%{transform:translateX(-100%)}55%,100%{transform:translateX(100%)}}

.ch-open{min-height:min(64vh,560px);display:flex;flex-direction:column;justify-content:center;padding:84px var(--gut) 76px;border-top:1px solid var(--border)}
.ch-num{margin:0 0 18px -.07em;color:var(--mute)}
.ch-say{margin:20px 0 0 -.03em;font-size:clamp(20px,2.2vw,30px);font-weight:600;letter-spacing:-.03em;color:var(--plum);max-width:14em}
.ch-open .ch-word,.ch-open .ch-num,.ch-open .ch-say{opacity:0;transform:translateY(26px);filter:blur(7px);transition:opacity 900ms ease,transform 1150ms var(--out),filter 900ms ease}
.ch-open.rv--in .ch-num{opacity:1;transform:none;filter:none}
.ch-open.rv--in .ch-word{opacity:1;transform:none;filter:none;transition-delay:80ms}
.ch-open.rv--in .ch-say{opacity:1;transform:none;filter:none;transition-delay:200ms}

/* ── pinned story ───────────────────────────── */
.ch-story{position:relative}
@media (min-width:901px){.ch-story{height:calc(100vh + var(--steps,3) * 88vh)}}
.ch-pin{position:sticky;top:0;height:100vh;display:grid;grid-template-columns:minmax(0,368px) minmax(0,1fr);align-items:center;gap:clamp(24px,4.4vw,88px);padding:84px var(--gut) 56px}
.ch-copy{max-width:420px}
.ch-lead{margin:0 0 40px -.03em;font-weight:600;font-size:clamp(22px,2.3vw,31px);line-height:1.16;letter-spacing:-.035em;text-wrap:pretty}
.steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.step{display:grid;grid-template-columns:40px 1fr;border-top:1px solid var(--border);padding:15px 0;cursor:pointer;transition:opacity var(--t)}
.step:last-child{border-bottom:1px solid var(--border)}
.step-n{color:var(--mute);padding-top:3px;transition:color var(--t)}
.step b{font-size:15px;font-weight:600;letter-spacing:-.01em;color:var(--mute);transition:color var(--t)}
.step p{grid-column:2;margin:0;font-size:13.5px;line-height:1.45;color:var(--ink-2);max-height:0;opacity:0;overflow:hidden;transition:max-height 420ms cubic-bezier(.2,.8,.2,1),opacity 240ms ease,margin-top 420ms cubic-bezier(.2,.8,.2,1)}
.step--on b{color:var(--ink)}
.step--on .step-n{color:var(--plum)}
.step--on p{max-height:90px;opacity:1;margin-top:6px}
.step:hover b{color:var(--ink-2)}
.step--on:hover b{color:var(--ink)}
.ch-close{margin:24px 0 0;font-size:14.5px;font-weight:600;letter-spacing:-.01em;color:var(--plum)}
.ch-demo{position:relative;height:min(72vh,660px);min-width:0}

/* ── "everything in" grid ───────────────────── */
.ch-more{padding:clamp(60px,9vh,120px) var(--gut) clamp(80px,12vh,150px)}
.more-label{margin:0 0 26px -.07em;color:var(--mute)}
.mgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--border);border-left:1px solid var(--border)}
.mcard{background:var(--canvas);border-right:1px solid var(--border);border-bottom:1px solid var(--border);padding:22px 24px 24px;display:flex;flex-direction:column;gap:7px;min-height:132px;transition:background var(--t)}
.mcard:hover{background:var(--paper)}
.mcard-h{display:flex;align-items:baseline;gap:10px}
.mcard-n{font-family:'Geist Mono',monospace;font-size:10.5px;letter-spacing:.14em;color:var(--mute)}
.mcard b{font-size:15px;font-weight:600;letter-spacing:-.012em}
.mcard p{margin:0;font-size:13.5px;line-height:1.45;color:var(--ink-2);text-wrap:pretty}
.mcard{opacity:0;transform:translateY(18px);transition:opacity 700ms ease,transform 800ms var(--out),background var(--t)}
.rv--in .mcard{opacity:1;transform:none}
.rv--in .mcard:nth-child(2){transition-delay:60ms}
.rv--in .mcard:nth-child(3){transition-delay:120ms}
.rv--in .mcard:nth-child(4){transition-delay:180ms}
.rv--in .mcard:nth-child(5){transition-delay:220ms}
.rv--in .mcard:nth-child(6){transition-delay:260ms}

/* ── footer (from the landing page) ──────────── */
.foot{margin-top:150px;padding:0 var(--gut) 44px}
.foot-top{border-top:1px solid var(--border);padding-top:56px;display:grid;grid-template-columns:380px 1fr;gap:24px}
.foot-mark{display:flex;flex-direction:column;gap:18px}
.foot-mark b{font-weight:600;font-size:34px;letter-spacing:-.045em;line-height:1}
.foot-mark p{margin:0;font-size:15px;font-weight:500;line-height:1.35;max-width:16ch}
.try-cta{display:inline-flex;align-items:center;gap:24px;font-weight:600;font-size:clamp(48px,7vw,96px);line-height:.9;letter-spacing:-.05em;transition:color var(--t)}
.try-cta .arrow{width:.62em;height:.62em;stroke-width:1.2;transition:transform 420ms cubic-bezier(.2,.8,.2,1)}
.try-cta:hover .arrow{transform:translateX(.16em)}
.foot-alt{margin:26px 0 0;font-size:16px;line-height:1.5}
.foot-alt span{display:block;color:var(--mute)}
.foot-alt a{font-weight:500;border-bottom:1px solid var(--border);padding-bottom:2px}
.foot-alt a:hover{border-color:var(--plum)}
.foot-bot{margin-top:96px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.foot-links{display:flex;gap:26px;flex-wrap:wrap}
.foot-links a{white-space:nowrap;font-size:13px;color:var(--mute)}
.foot-links a:hover{color:var(--ink)}
.foot-copy{font-size:13px;color:var(--mute)}

/* ── end ────────────────────────────────────── */
.ibtn{--mx:50%;--my:120%;position:relative;display:inline-flex;align-items:center;gap:18px;height:50px;padding:0 8px 0 24px;border-radius:999px;background:var(--ink);color:var(--paper);overflow:hidden;isolation:isolate;white-space:nowrap;font-family:'Geist Mono',monospace;font-size:11px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;box-shadow:0 12px 30px -14px rgba(10,10,10,.55),0 1px 3px rgba(10,10,10,.14);transition:transform 520ms var(--out),box-shadow 520ms var(--out),color 300ms ease}
.ibtn-fill{position:absolute;left:var(--mx);top:var(--my);z-index:-1;width:12px;height:12px;border-radius:999px;background:radial-gradient(circle at 50% 40%,color-mix(in oklab,var(--plum) 88%,#fff),var(--plum-700));transform:translate(-50%,-50%) scale(0);transition:transform 680ms var(--out)}
.ibtn-label{position:relative;display:block;height:13px;overflow:hidden}
.ibtn-label span{display:block;height:13px;line-height:13px;transition:transform 560ms var(--out)}
.ibtn-knob{width:34px;height:34px;flex:none;border-radius:999px;background:var(--paper);color:var(--ink);display:grid;place-items:center;transition:transform 560ms var(--out)}
.ibtn:hover,.ibtn:focus-visible{color:#fff;transform:translateY(-3px) scale(1.035);box-shadow:0 26px 50px -16px color-mix(in oklab,var(--plum) 62%,transparent),0 2px 6px rgba(10,10,10,.12)}
.ibtn:hover .ibtn-fill,.ibtn:focus-visible .ibtn-fill{transform:translate(-50%,-50%) scale(38)}
.ibtn:hover .ibtn-label span,.ibtn:focus-visible .ibtn-label span{transform:translateY(-13px)}
.ibtn:hover .ibtn-knob{transform:rotate(45deg) scale(1.08)}
.ibtn:active{transform:scale(.955);transition-duration:130ms}
.ibtn:active .ibtn-knob{transform:rotate(45deg) scale(.9)}
.ibtn--lg{height:66px;padding:0 12px 0 34px;font-size:12px;gap:26px}
.ibtn--lg .ibtn-label,.ibtn--lg .ibtn-label span{height:15px;line-height:15px}
.ibtn--lg:hover .ibtn-label span{transform:translateY(-15px)}
.ibtn--lg .ibtn-knob{width:44px;height:44px}
.ibtn--lg .ibtn-knob .arrow{width:18px;height:18px}

/* ── responsive ─────────────────────────────── */
@media (max-width:1000px){
  .foot-top{grid-template-columns:1fr;gap:14px}
}
/* header fit: the centered chapter row (~490px) must never meet the right cluster.
   Android text link only on very wide screens; chapters hidden below 1260px. */
@media (max-width:1760px){
  .nav-link{display:none}
}
@media (max-width:1160px){
  .nav-right{gap:0}
}
@media (max-width:1260px){
  .nav-mid{display:none}
}
@media (max-width:900px){
  .ch-story{height:calc(100vh + var(--steps,3) * 60vh)}
  .ch-pin{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;align-items:stretch;justify-content:center;gap:0;padding:60px var(--gut) 10px;grid-template-columns:none}
  .ch-copy{display:contents}
  .ch-pin>*,.ch-demo,.dstage{min-width:0}
  .ch-lead{order:1;flex:none;margin:0 0 8px;font-size:19px;line-height:1.2}
  .ch-demo{order:2;flex:1 1 0;min-height:0;height:auto;overflow:clip;overflow-clip-margin:60px}
  .steps{order:3;flex:none;margin-top:8px}
  .step{padding:8px 0;min-height:0;grid-template-columns:30px 1fr}
  .step p{font-size:12.5px}
  .mgrid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  :root{--gut:20px}
  .nav{height:64px;padding:0 var(--gut)}
  .nav .ibtn{gap:14px;padding:0 8px 0 18px}
  .foot{margin-top:64px}
  .foot-top{grid-template-columns:1fr;gap:14px;padding-top:40px}
  .foot-bot{margin-top:48px}
  .ibtn--lg{height:58px;padding:0 10px 0 26px;gap:18px}
  .ch--intro{padding:92px var(--gut) 54px}
  .ch-word.hero{margin-bottom:16px;margin-left:-.045em}
  .scroll-cue{margin-top:28px}
  .ch-open{min-height:0;padding:52px var(--gut) 48px}
  .ch-num{margin-bottom:14px;margin-left:-.07em}
  .ch-say{margin-top:14px;margin-left:-.03em}
  .ch-more{padding:48px var(--gut) 64px}
  .ch-lead{margin-bottom:28px;margin-left:-.03em}
  .mgrid{grid-template-columns:1fr}
  .mcard{min-height:0}

}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:smooth}
  .hl,.i-up,.mcard,.ch-open .ch-word,.ch-open .ch-num,.ch-open .ch-say{opacity:1;filter:none;transform:none;transition:none}
  .cue-line::after{animation:none}
}

.nb{white-space:nowrap}
/* ── slim scrollbar ── */
html{scrollbar-width:none}
::-webkit-scrollbar{width:0;height:0;display:none;background:transparent}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:transparent}

/* Buttafly Business button (matches the landing page) */
.nav-biz{display:inline-flex;align-items:center;gap:8px;height:44px;padding:0 18px;border:1px solid var(--border);border-radius:999px;font-size:14px;font-weight:500;color:var(--ink);background:var(--paper);white-space:nowrap;transition:background 260ms ease,color 260ms ease,border-color 260ms ease,transform 420ms cubic-bezier(.16,1,.3,1)}
.nav-biz:hover{background:var(--ink);border-color:var(--ink);color:var(--canvas);transform:translateY(-1px)}
.nav-biz .arrow{width:14px;height:14px}
.nav-biz-s{display:none}
.nav .nav-biz.i-up{transition-delay:940ms}
@media (max-width:1160px){.nav-right{gap:10px}}
@media (max-width:1400px){.nav-biz-l{display:none}.nav-biz-s{display:inline}}
@media (max-width:560px){.nav-biz{height:40px;padding:0 13px;font-size:13px}.nav-biz .arrow{display:none}.nav{gap:14px}}
@media (max-width:440px){.brand-mark{height:12px;width:100px}.nav-right{gap:8px}}
.brand-img{display:block;height:19px;width:auto}
@media (max-width:560px){.brand-img{height:15px}}
@media (max-width:440px){.brand-img{height:12px}}

/* ── site nav: Home sits next to the brand on desktop/tablet (auto margin keeps the right cluster in place); phones get a button at the bottom instead ── */
.nav-side{margin-left:22px;margin-right:auto;display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:500;color:var(--ink-2);transition:color var(--t-fast)}
.nav-side:hover{color:var(--ink)}
.nav-ico{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
@media (max-width:560px){.nav-side{display:none}}
.foot-nav-btn{display:none}
@media (max-width:560px){
  .foot-nav-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;width:100%;height:50px;margin-top:22px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--ink);font-size:15px;font-weight:600;text-decoration:none}
  .foot-nav-btn .arrow{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
}