/* Threadstow public site. Shoebox hero and story, with the two-source board as the second screen. */
:root{
  --violet:#6D5BD0;--violet-2:#8B7BE8;--tint:#EFEBFB;--paper:#FBF8F3;--paper-2:#F3EEE6;--card:#FFFFFF;--ink:#241F2E;--ink-2:#5E5769;--ink-3:#8E879A;--line:#E6DFD5;
  --green:#2FA463;--green-bg:#E6F5EC;--amber:#B07D00;--amber-bg:#FFF4D6;--red:#E64A3D;--blue:#0A70DC;--recv:#E9E9EB;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",Helvetica,Arial,sans-serif;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.6 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
h1,h2,h3,p{margin:0}img{display:block;max-width:100%;height:auto}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
:focus-visible{outline:2px solid var(--amber);outline-offset:4px;border-radius:6px}
.skip{position:fixed;top:-80px;left:16px;z-index:50;background:#fff;padding:10px 16px;border-radius:8px}.skip:focus{top:12px}
noscript{display:block;padding:24px;text-align:center;color:var(--ink-2)}

.hdr{position:sticky;top:0;z-index:20;background:rgba(251,248,243,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:border-color .3s}
.hdr.scrolled{border-color:var(--line)}
.hdr .wrap{height:72px;display:flex;align-items:center;gap:28px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:650;font-size:20px;letter-spacing:-.4px}
.brand svg{width:30px;height:26px;color:var(--violet)}
.nav{margin-left:auto;display:flex;gap:26px;font-size:15px;color:var(--ink-2)}
.nav a:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:99px;font-weight:600;font-size:15px;background:var(--violet);color:#fff;transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(109,91,208,.28)}
.btn.sm{padding:9px 15px;font-size:14px}
.btn.line{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn.line:hover{box-shadow:none;background:#fff}

/* hero */
.hero{padding:70px 0 40px;position:relative}
.hero .wrap{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center;min-height:560px}
.kicker{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--violet);font-weight:600;margin-bottom:18px}
h1{font-family:var(--serif);font-weight:400;font-size:clamp(44px,6vw,80px);line-height:1;letter-spacing:-.02em}
h1 i{font-style:italic;color:var(--violet)}
.lead{font-size:20px;color:var(--ink-2);max-width:48ch;margin:26px 0 30px}
.cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.fine{font-size:14px;color:var(--ink-3);margin-top:16px}

/* keepsake stack */
.stack{position:relative;height:520px;perspective:1400px}
.keep{position:absolute;left:50%;top:50%;width:min(360px,80%);background:var(--card);border-radius:20px;box-shadow:0 30px 60px rgba(60,40,90,.18),0 2px 0 rgba(0,0,0,.03);padding:18px;transform:translate(-50%,-50%) rotate(var(--r)) translate(var(--x),var(--y));transition:transform .7s cubic-bezier(.2,.7,.2,1),box-shadow .4s;cursor:pointer;border:1px solid rgba(0,0,0,.04)}
.keep:hover{box-shadow:0 40px 70px rgba(60,40,90,.24)}
.keep.top{z-index:3}.keep.mid{z-index:2}.keep.low{z-index:1}
.keep .who{display:flex;align-items:center;gap:10px;font-size:14px;margin-bottom:12px}
.keep .av{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700;color:#fff}
.av-amber{background:#B07D00}.av-violet{background:#6D5BD0}.av-green{background:#2FA463}
.keep .who small{display:block;color:var(--ink-3);font-size:12px}
.keep .chip{margin-left:auto;font-size:12px;color:var(--green);font-weight:600;display:inline-flex;gap:5px;align-items:center}
.keep img{border-radius:12px;aspect-ratio:3/2;object-fit:cover;width:100%}
.bub{display:table;padding:8px 13px;border-radius:16px;margin:8px 0 0;font-size:14px;max-width:85%}
.bub.r{background:var(--recv)}.bub.s{background:var(--blue);color:#fff;margin-left:auto}
.recipe{background:linear-gradient(135deg,#FFF3D6,#FFE4B3);border-radius:12px;padding:22px;aspect-ratio:3/2;display:flex;flex-direction:column;justify-content:flex-end;font-family:var(--serif)}
.recipe b{font-size:26px;line-height:1.1;font-weight:400}.recipe span{font-size:13px;color:#7a5a12;font-family:var(--sans)}
.voice{background:linear-gradient(135deg,#E8E3FA,#D6CEF6);border-radius:12px;padding:22px;aspect-ratio:3/2;display:flex;flex-direction:column;justify-content:center;gap:14px}
.wave{display:flex;gap:3px;align-items:center;height:44px}
.wave i{width:4px;border-radius:2px;background:var(--violet);height:var(--h);opacity:.85}
.voice span{font-size:13px;color:#4c3f9a}
.stack-hint{position:absolute;bottom:-6px;left:0;right:0;text-align:center;font-size:13px;color:var(--ink-3)}

/* years strip */
.years{border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;background:var(--paper-2)}
.years .track{display:flex;gap:64px;padding:18px 0;white-space:nowrap;font-family:var(--serif);font-size:22px;color:var(--ink-3);animation:slide 40s linear infinite}
.years .track span b{color:var(--ink);font-weight:400;margin-right:10px}
@keyframes slide{to{transform:translateX(-50%)}}

/* section basics */
h2{font-family:var(--serif);font-weight:400;font-size:clamp(36px,4.6vw,58px);line-height:1.02;letter-spacing:-.02em;max-width:20ch}
.sub{font-size:19px;color:var(--ink-2);max-width:56ch;margin-top:18px}

/* the rule: two-source board */
.rule{padding:110px 0 90px}
.rule-head{margin-bottom:40px}
.rule-head h2{max-width:24ch}
.board{background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:0 30px 80px rgba(60,40,90,.12);padding:28px}
.board-top{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.seg{display:inline-flex;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:4px}
.seg button{padding:8px 16px;border-radius:10px;font-weight:600;font-size:14px;color:var(--ink-2);display:flex;flex-direction:column;align-items:flex-start;line-height:1.2}
.seg button small{font-weight:400;font-size:11px;color:var(--ink-3)}
.seg button[aria-pressed=true]{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}
.flow{display:grid;grid-template-columns:1fr 110px 1fr 110px 1fr;align-items:center}
.node{border:1px solid var(--line);border-radius:16px;padding:20px;background:var(--paper);min-height:200px;position:relative;transition:border-color .3s,box-shadow .3s,opacity .3s}
.node.on{border-color:var(--violet);box-shadow:0 0 0 4px rgba(109,91,208,.12);background:#fff}
.node.dim{opacity:.45}
.node h4{margin:0 0 4px;font-size:15px;display:flex;align-items:center;gap:8px}
.node h4 i{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;background:var(--tint);color:var(--violet);font-style:normal;font-size:13px}
.node p{font-size:13px;color:var(--ink-2)}
.node .chips{margin-top:12px;display:grid;gap:5px}
.chip2{display:inline-flex;align-items:center;gap:6px;font-size:12px;padding:5px 9px;border-radius:8px;background:#fff;border:1px solid var(--line);justify-self:start}
.chip2.ok{color:var(--green);background:var(--green-bg);border-color:transparent}
.chip2.wait{color:var(--amber);background:var(--amber-bg);border-color:transparent}
.link{height:2px;position:relative;background:var(--line)}
.link::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(90deg,var(--violet) 0 10px,transparent 10px 18px);opacity:0;transition:opacity .3s}
.link.on::before{opacity:1;animation:flow 1s linear infinite}
.link::after{content:"";position:absolute;right:-1px;top:-5px;border:6px solid transparent;border-left-color:var(--line)}
.link.on::after{border-left-color:var(--violet)}
.link .lab{position:absolute;top:10px;left:50%;transform:translateX(-50%);width:104px;text-align:center;font-size:11px;line-height:1.25;color:var(--ink-3)}
@keyframes flow{to{background-position:18px 0}}
.verdict{margin-top:24px;display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:stretch}
.vbox{border-radius:14px;padding:20px;border:1px solid var(--line);background:var(--paper)}
.vbox h4{margin:0 0 12px;font-size:14px;color:var(--ink-2);font-weight:600}
.cond{display:grid;gap:8px}
.cond label{display:flex;gap:10px;align-items:center;font-size:14px;padding:9px 12px;border-radius:10px;background:#fff;border:1px solid var(--line);cursor:pointer}
.cond label.locked{opacity:.55;cursor:not-allowed}
.cond input{accent-color:var(--violet);width:16px;height:16px;margin:0}
.cond small{margin-left:auto;font-size:11px;color:var(--ink-3);text-align:right}
.result{display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;gap:10px;transition:background .3s,border-color .3s}
.result .big{font-size:22px;font-weight:700;display:flex;align-items:center;gap:10px;letter-spacing:-.02em}
.result .big i{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;color:#fff;font-style:normal;font-weight:700;flex:none}
.result p{font-size:13px;color:var(--ink-2);max-width:32ch}
.result[data-v=no]{background:var(--amber-bg);border-color:#EED9A0}.result[data-v=no] .big i{background:var(--amber)}
.result[data-v=yes]{background:var(--green-bg);border-color:#BFE3CC}.result[data-v=yes] .big i{background:var(--green)}
.result[data-v=never]{background:#FBE9E7;border-color:#F3C1BC}.result[data-v=never] .big i{background:var(--red)}
.board-foot{margin-top:14px;font-size:12px;color:var(--ink-3)}

/* scroll story */
.story{padding:60px 0 100px}
.story .wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;align-items:start}
.steps{display:grid;gap:40vh;padding-top:10vh;padding-bottom:20vh}
.step{opacity:.28;transition:opacity .4s}
.step.on{opacity:1}
.step .n{font-family:var(--serif);font-size:56px;line-height:1;color:var(--violet);margin-bottom:12px}
.step h3{font-size:30px;font-family:var(--serif);font-weight:400;letter-spacing:-.01em;margin-bottom:12px}
.step p{color:var(--ink-2);max-width:44ch}
.step p.caveat{font-size:14px;color:var(--ink-3);margin-top:10px}
.sticky{position:sticky;top:110px}
.app{background:#fff;border-radius:14px;border:1px solid var(--line);box-shadow:0 30px 80px rgba(60,40,90,.16);overflow:hidden;font-size:13px}
.app-bar{height:44px;display:flex;align-items:center;gap:12px;padding:0 14px;border-bottom:1px solid var(--line);background:#F7F5F1}
.lights{display:flex;gap:7px}.lights i{width:11px;height:11px;border-radius:50%}.lights i:nth-child(1){background:#ff5f57}.lights i:nth-child(2){background:#febc2e}.lights i:nth-child(3){background:#28c840}
.app-bar b{font-weight:600}
.app-bar .src{margin-left:auto;display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--ink-2);background:#fff;border:1px solid var(--line);padding:4px 10px;border-radius:99px}
.app-bar .src i{width:7px;height:7px;border-radius:50%;background:var(--green)}
.app-body{display:grid;grid-template-columns:150px 1fr;min-height:420px}
.side{border-right:1px solid var(--line);padding:12px 10px;background:#FBFAF8}
.side h4{margin:8px 0 6px;font-size:11px;color:var(--ink-3);font-weight:600;text-transform:uppercase;letter-spacing:.05em}
.side a{display:flex;justify-content:space-between;padding:6px 9px;border-radius:7px;color:var(--ink-2)}
.side a.on{background:var(--violet);color:#fff}
.side a[data-glow]{transition:background .3s}
.side a.glow{background:rgba(109,91,208,.15);color:var(--ink)}
.tx{padding:16px}
.tx .hd{display:flex;align-items:center;gap:8px;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.tx .hd b{font-size:14px}.tag{font-size:11px;padding:2px 7px;border-radius:99px;background:#EEECEA;color:var(--ink-2)}
.tag.ok{background:var(--green-bg);color:var(--green)}.tag.wait{background:var(--amber-bg);color:var(--amber)}
.msgs{display:grid;gap:6px}
.m{max-width:75%;padding:7px 12px;border-radius:16px;font-size:13px;opacity:0;transform:translateY(8px);animation:pop .4s ease forwards}
.m.r{background:var(--recv);justify-self:start}.m.s{background:var(--blue);color:#fff;justify-self:end}
.m.photo{padding:4px;background:transparent;justify-self:start}.m.photo img{border-radius:12px;width:190px;aspect-ratio:3/2;object-fit:cover}
.m .t{display:block;font-size:10px;color:var(--ink-3);margin-top:3px}
.m.s .t{color:rgba(255,255,255,.75)}
.m .ok{color:var(--green)}.m .wait{color:var(--amber)}
@keyframes pop{to{opacity:1;transform:none}}
.date{font-size:11px;color:var(--ink-3);text-align:center;margin:4px 0}
.check{margin-top:14px;border:1px solid var(--line);border-radius:10px;padding:12px;display:none;background:#FBFAF8}
.check.on{display:block}
.check h5{margin:0 0 8px;font-size:12px}
.check ul{margin:0;padding:0}
.check li{display:flex;gap:8px;align-items:center;font-size:12px;padding:3px 0;list-style:none}
.check i{width:14px;height:14px;border-radius:50%;display:inline-grid;place-items:center;font-size:9px;font-style:normal;color:#fff;background:var(--green)}
.check i.w{background:var(--amber)}
.check .verdict-line{margin-top:8px;font-weight:600;color:var(--green)}

/* what you keep */
.keepgrid{padding:40px 0 120px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:48px}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:28px;transition:transform .3s,box-shadow .3s}
.card:hover{transform:translateY(-3px);box-shadow:0 22px 40px rgba(60,40,90,.12)}
.card h3{font-size:19px;margin:16px 0 8px}.card p{color:var(--ink-2);font-size:15px}
.card .ico{width:42px;height:42px;border-radius:12px;background:var(--tint);color:var(--violet);display:grid;place-items:center}
.card .ico svg{width:22px;height:22px}
.card code{font:13px/1.4 ui-monospace,"SF Mono",Menlo,monospace;background:var(--tint);padding:1px 5px;border-radius:5px;color:#4c3f9a}
.grid-note{margin-top:28px;max-width:70ch}
.card.wide{grid-column:1/-1}.card.wide p{max-width:78ch}

/* photo band */
.band{position:relative;color:#fff;overflow:hidden;border-radius:28px;margin:0 24px}
.band img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.band::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(38,26,80,.92) 0%,rgba(38,26,80,.55) 55%,rgba(38,26,80,.15) 100%)}
.band .in{position:relative;z-index:1;padding:96px 64px;max-width:640px}
.band h2{color:#fff}.band p{color:rgba(255,255,255,.85);margin:18px 0 28px;font-size:18px}
.band .btn{background:#fff;color:var(--ink)}

/* faq */
.faq{padding:120px 0}
.faq .wrap{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px}
details{border-top:1px solid var(--line);padding:18px 0}details:last-child{border-bottom:1px solid var(--line)}
summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:20px;font-size:17px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--violet);font-size:22px;line-height:1;font-weight:300}
details[open] summary::after{content:"−"}
details p{color:var(--ink-2);margin-top:10px;max-width:60ch;font-size:16px}

footer{border-top:1px solid var(--line);padding:36px 0;font-size:14px;color:var(--ink-3)}
footer .wrap{display:flex;gap:24px;flex-wrap:wrap}footer .wrap a:last-child{margin-left:auto}

dialog{background:#fff;color:var(--ink);border:0;border-radius:20px;padding:34px;max-width:440px;width:calc(100% - 32px);box-shadow:0 40px 100px rgba(0,0,0,.3)}
dialog::backdrop{background:rgba(36,31,46,.5);backdrop-filter:blur(4px)}
dialog h3{font-family:var(--serif);font-weight:400;font-size:28px;margin-bottom:10px;letter-spacing:-.01em}
dialog p{color:var(--ink-2)}dialog .row{margin-top:22px}

@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.m{opacity:1;transform:none}.years .track{animation:none}}
@media (max-width:960px){
  .hero .wrap{grid-template-columns:1fr;min-height:0}.stack{height:440px}.nav{display:none}
  .flow{grid-template-columns:1fr;gap:14px}.link{height:36px;width:2px;margin:0 auto;background:var(--line)}.link::before{background:repeating-linear-gradient(180deg,var(--violet) 0 10px,transparent 10px 18px)}.link::after{right:auto;top:auto;bottom:-1px;left:-5px;border:6px solid transparent;border-top-color:var(--line)}.link.on::after{border-top-color:var(--violet);border-left-color:transparent}.link .lab{display:none}
  .verdict{grid-template-columns:1fr}.board{padding:18px}.node{min-height:0}.rule{padding:70px 0 50px}
  .story .wrap{grid-template-columns:1fr}.sticky{position:static}.steps{gap:40px;padding:0 0 30px}.step{opacity:1}
  .grid{grid-template-columns:1fr}.faq .wrap{grid-template-columns:1fr;gap:24px}.band .in{padding:56px 28px}.band{margin:0 12px}
  .app-body{grid-template-columns:1fr}.side{display:none}.story,.faq{padding:70px 0}
}