/* Keep Your Chain — site stylesheet */
:root{
  --paper:#F6F2EA; --paper-2:#FDFBF7; --paper-3:#EFE9DD;
  --ink:#1E1A15; --ink-2:#4A433B; --mute:#7A7168;
  --line:#DED6C8; --line-2:#EBE4D6;
  --link:#27456F; --link-ink:#1B3050; --link-bg:#E8EEF6;
  --reply:#3C7A4E; --reply-bg:#E3EFE2;
  --warn:#8A6116; --warn-bg:#FBF1DC; --bad:#A33A2E; --bad-bg:#F8E4E0;
  --shadow:0 1px 0 rgba(30,26,21,.05), 0 12px 32px -12px rgba(30,26,21,.18);
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"IBM Plex Sans",-apple-system,"Segoe UI",Helvetica,Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --measure:64ch; --wide:1080px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#181512; --paper-2:#211D18; --paper-3:#2A251F;
    --ink:#EFE9DE; --ink-2:#CFC6B8; --mute:#978C7E;
    --line:#3A3329; --line-2:#2E2822;
    --link:#8FB0DE; --link-ink:#B3CBEC; --link-bg:#1E2B3D;
    --reply:#7DBB8B; --reply-bg:#1D2E22;
    --warn:#D6A84A; --warn-bg:#332A14; --bad:#E0796B; --bad-bg:#3A1F1B;
    --shadow:0 1px 0 rgba(0,0,0,.3), 0 12px 32px -12px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"]{
  --paper:#181512; --paper-2:#211D18; --paper-3:#2A251F;
  --ink:#EFE9DE; --ink-2:#CFC6B8; --mute:#978C7E;
  --line:#3A3329; --line-2:#2E2822;
  --link:#8FB0DE; --link-ink:#B3CBEC; --link-bg:#1E2B3D;
  --reply:#7DBB8B; --reply-bg:#1D2E22;
  --warn:#D6A84A; --warn-bg:#332A14; --bad:#E0796B; --bad-bg:#3A1F1B;
  --shadow:0 1px 0 rgba(0,0,0,.3), 0 12px 32px -12px rgba(0,0,0,.6);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *{animation:none!important;transition:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.6;padding-inline:clamp(16px,4vw,40px);padding-block:0;-webkit-font-smoothing:antialiased}
a{color:var(--link);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:color-mix(in srgb,var(--link) 45%,transparent)}
a:hover{color:var(--link-ink);text-decoration-color:currentColor}
:focus-visible{outline:2px solid var(--link);outline-offset:3px;border-radius:2px}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{font-family:var(--serif);font-weight:500;line-height:1.12;letter-spacing:-.012em;margin:0;text-wrap:balance}
h1{font-size:clamp(38px,6vw,64px)}
h2{font-size:clamp(28px,3.6vw,40px)}
h3{font-size:clamp(21px,2.4vw,26px)}
h4{font-size:19px}
h1 em,h2 em,h3 em{font-style:italic;color:var(--link)}
p{margin:0 0 1em;max-width:var(--measure)}
p.lede{font-size:clamp(18px,2vw,21px);color:var(--ink-2);line-height:1.5}
small,.small{font-size:14px;color:var(--mute)}
code,pre,kbd{font-family:var(--mono)}
code{font-size:.88em;background:var(--paper-3);padding:1px 6px;border-radius:4px}
pre{background:var(--paper-3);border:1px solid var(--line);border-radius:6px;padding:16px 18px;font-size:13.5px;line-height:1.55;overflow-x:auto;margin:0 0 1.2em;max-width:100%}
pre code{background:none;padding:0;font-size:inherit}
.eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:.09em;text-transform:uppercase;color:var(--mute);margin:0 0 14px}
.wrap{max-width:var(--wide);margin:0 auto}
.narrow{max-width:720px;margin:0 auto}

/* header */
.site-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:22px 18px;border-bottom:1px solid var(--line);max-width:var(--wide);margin:0 auto}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:var(--serif);font-size:22px;font-weight:500;letter-spacing:-.01em}
.brand svg{width:26px;height:26px;stroke:var(--link)}
.site-nav{display:flex;align-items:center;gap:clamp(12px,2.4vw,28px);flex-wrap:wrap;justify-content:flex-end}
.site-nav a{text-decoration:none;color:var(--ink-2);font-size:15.5px}
.site-nav a:hover,.site-nav a[aria-current]{color:var(--ink)}
.site-nav a[aria-current]{border-bottom:1.5px solid var(--link);padding-bottom:2px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--ink);color:var(--paper);border:1px solid var(--ink);border-radius:6px;padding:10px 18px;font-family:var(--sans);font-size:15.5px;font-weight:500;text-decoration:none;cursor:pointer;line-height:1.2;white-space:nowrap}
.btn:hover{background:var(--link-ink);border-color:var(--link-ink);color:#fff}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--ink);background:var(--paper-2);color:var(--ink)}
.site-nav a.btn{padding:8px 14px;font-size:14.5px;color:var(--paper)}
.site-nav a.btn:hover{color:#fff}
.brand{white-space:nowrap}
@media (max-width:640px){.site-head{flex-direction:column;align-items:flex-start;gap:12px}.site-nav{justify-content:flex-start}.site-nav a.btn{display:none}}

/* hero */
.hero{padding-block:clamp(48px,8vw,96px) clamp(36px,5vw,64px);display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:clamp(28px,5vw,64px);align-items:center;max-width:var(--wide);margin:0 auto}
.hero .cta{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:26px}
.hero .note{margin-top:12px;font-size:14px;color:var(--mute)}
@media (max-width:820px){.hero{grid-template-columns:1fr}}

/* the thread illustration */
.thread{background:var(--paper-2);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);overflow:hidden;font-size:14px}
.thread .bar{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line-2);font-family:var(--sans)}
.thread .bar b{font-weight:600}
.thread .bar .n{margin-left:auto;font-family:var(--mono);font-size:12px;color:var(--mute)}
.msg{padding:14px 16px;border-bottom:1px solid var(--line-2);display:grid;grid-template-columns:30px 1fr auto;gap:10px 12px;align-items:start}
.msg:last-child{border-bottom:0}
.msg .av{width:30px;height:30px;border-radius:50%;background:var(--link-bg);color:var(--link-ink);display:grid;place-items:center;font-size:12px;font-weight:600;font-family:var(--sans)}
.msg .who{font-weight:600}
.msg .who span{font-weight:400;color:var(--mute);margin-left:6px}
@media (max-width:480px){.msg .who span{display:block;margin:0;font-size:12.5px}.thread .bar .n{display:none}}
.msg .when{font-size:12.5px;color:var(--mute);white-space:nowrap}
.msg .body{grid-column:2 / -1;color:var(--ink-2);line-height:1.5}
.msg.reply .av{background:var(--reply-bg);color:var(--reply)}
.msg.collapsed .body{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hdrs{font-family:var(--mono);font-size:12px;line-height:1.55;color:var(--mute);background:var(--paper-3);padding:12px 16px;border-top:1px dashed var(--line);white-space:pre;overflow-x:auto}
.hdrs b{color:var(--link);font-weight:500}

/* sections */
section.block{padding-block:clamp(44px,7vw,88px);border-top:1px solid var(--line);max-width:var(--wide);margin:0 auto}
section.block > .head{max-width:720px;margin-bottom:clamp(24px,4vw,44px)}
section.block > .head p{margin-top:12px}
.three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,40px)}
.three h3{margin-bottom:10px}
.three p{font-size:16px;color:var(--ink-2)}
@media (max-width:760px){.three{grid-template-columns:1fr}}

/* feature rows */
.feat{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(24px,4vw,56px);align-items:center;padding-block:clamp(28px,4vw,48px)}
.feat + .feat{border-top:1px solid var(--line-2)}
.feat.flip{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.feat.flip .txt{order:2}
.feat .txt h3{margin-bottom:12px}
.feat .txt p{font-size:16.5px;color:var(--ink-2)}
.feat ul{margin:0;padding-left:18px;color:var(--ink-2);font-size:15.5px}
.feat li{margin-bottom:6px}
.shot{border:1px solid var(--line);border-radius:8px;overflow:hidden;box-shadow:var(--shadow);background:var(--paper-2)}
.shot.phone{max-width:300px;margin:0 auto;border-radius:22px}
@media (max-width:820px){.feat,.feat.flip{grid-template-columns:1fr}.feat.flip .txt{order:0}}

/* invariants list */
.rules{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 clamp(24px,4vw,56px)}
.rules li{padding:18px 0;border-top:1px solid var(--line-2);display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start}
.rules li .k{font-family:var(--mono);font-size:12px;color:var(--link);letter-spacing:.06em;text-transform:uppercase;padding-top:5px;white-space:nowrap}
.rules li b{display:block;font-family:var(--serif);font-size:20px;font-weight:500;margin-bottom:4px}
.rules li p{margin:0;font-size:15.5px;color:var(--ink-2)}
@media (max-width:760px){.rules{grid-template-columns:1fr}}

/* tables */
.tablewrap{overflow-x:auto;margin:0 0 1.2em}
table{border-collapse:collapse;width:100%;font-size:15px;min-width:520px}
th{text-align:left;font-family:var(--mono);font-weight:500;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--mute);padding:8px 10px;border-bottom:1px solid var(--line)}
td{padding:10px;border-bottom:1px solid var(--line-2);vertical-align:top}
td code{white-space:nowrap}
.num{font-variant-numeric:tabular-nums}
.pill{display:inline-block;font-family:var(--mono);font-size:11.5px;padding:2px 8px;border-radius:999px;background:var(--paper-3);color:var(--ink-2);white-space:nowrap}
.pill.ok{background:var(--reply-bg);color:var(--reply)}
.pill.warn{background:var(--warn-bg);color:var(--warn)}
.pill.bad{background:var(--bad-bg);color:var(--bad)}
.pill.link{background:var(--link-bg);color:var(--link-ink)}

/* callouts */
.aside{border-left:3px solid var(--link);padding:12px 18px;background:var(--paper-2);border-radius:0 6px 6px 0;margin:0 0 1.4em;max-width:var(--measure)}
.aside p:last-child{margin-bottom:0}
.aside.warn{border-color:var(--warn)}

/* pricing */
.price{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(24px,4vw,56px);align-items:start}
.pricecard{background:var(--paper-2);border:1px solid var(--line);border-radius:10px;padding:clamp(22px,3vw,34px);box-shadow:var(--shadow)}
.pricecard .amt{font-family:var(--serif);font-size:56px;line-height:1;margin:6px 0 4px}
.pricecard .amt small{font-family:var(--sans);font-size:15px;color:var(--mute)}
.pricecard ul{padding-left:18px;margin:18px 0 0;color:var(--ink-2);font-size:15.5px}
.pricecard li{margin-bottom:8px}
@media (max-width:760px){.price{grid-template-columns:1fr}}

/* waitlist form */
.waitlist{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px;max-width:520px}
.waitlist input{flex:1 1 220px;font:inherit;font-size:15.5px;padding:10px 14px;border:1px solid var(--line);border-radius:6px;background:var(--paper-2);color:var(--ink);min-width:0}
.waitlist input:focus{border-color:var(--link)}
.waitlist .msg{grid-column:1/-1;font-size:14px;color:var(--mute);margin:0;width:100%;display:block;padding:0}
.waitlist .msg.ok{color:var(--reply)} .waitlist .msg.err{color:var(--bad)}

/* blog */
.posts{display:grid;gap:0}
.post-card{display:grid;grid-template-columns:120px 1fr;gap:20px;padding:26px 0;border-top:1px solid var(--line-2);align-items:start}
.post-card:last-child{border-bottom:1px solid var(--line-2)}
.post-card .date{font-family:var(--mono);font-size:12.5px;color:var(--mute);padding-top:8px}
.post-card h3 a{text-decoration:none;color:var(--ink)}
.post-card h3 a:hover{color:var(--link)}
.post-card p{margin:8px 0 0;color:var(--ink-2);font-size:16px}
@media (max-width:640px){.post-card{grid-template-columns:1fr;gap:6px}}
article.post{max-width:720px;margin:0 auto;padding-block:clamp(36px,6vw,72px) clamp(44px,7vw,88px)}
article.post header{margin-bottom:36px}
article.post header h1{font-size:clamp(34px,5vw,50px)}
article.post header .meta{font-family:var(--mono);font-size:13px;color:var(--mute);margin-top:14px}
article.post h2{font-size:clamp(24px,3vw,30px);margin:40px 0 12px}
article.post h3{font-size:21px;margin:28px 0 8px}
article.post p{max-width:none;font-size:17.5px;line-height:1.65}
article.post ul,article.post ol{padding-left:22px;font-size:17px;line-height:1.6;color:var(--ink-2)}
article.post li{margin-bottom:6px}
article.post blockquote{margin:0 0 1.2em;padding:4px 0 4px 20px;border-left:3px solid var(--line);font-family:var(--serif);font-size:20px;color:var(--ink-2);font-style:italic}
article.post .cta{margin-top:44px;padding:22px 24px;background:var(--paper-2);border:1px solid var(--line);border-radius:8px}
article.post .cta p{margin:0 0 10px;font-size:16px}
.postnav{max-width:720px;margin:0 auto;padding:22px 0 60px;border-top:1px solid var(--line);font-size:15px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

/* footer */
.site-foot{border-top:1px solid var(--line);padding-block:32px 44px;max-width:var(--wide);margin:0 auto;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px;font-size:14.5px;color:var(--mute)}
.site-foot a{color:var(--ink-2);text-decoration:none}
.site-foot a:hover{color:var(--link)}
.site-foot ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.site-foot .h{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--mute);margin-bottom:12px}
.site-foot p{margin:8px 0 0;max-width:40ch}
@media (max-width:640px){.site-foot{grid-template-columns:1fr}}

/* page hero (interior) */
.page-head{padding-block:clamp(40px,7vw,80px) clamp(20px,4vw,40px);max-width:820px}
.page-head p.lede{margin-top:16px}
.steps{counter-reset:s;display:grid;gap:0}
.step{display:grid;grid-template-columns:64px 1fr;gap:20px;padding:26px 0;border-top:1px solid var(--line-2)}
.step .n{font-family:var(--serif);font-size:34px;color:var(--link);line-height:1;padding-top:4px}
.step h3{margin-bottom:8px}
.step p,.step ul{color:var(--ink-2);font-size:16px}
.step ul{padding-left:18px;margin:0}
@media (max-width:560px){.step{grid-template-columns:1fr;gap:6px}}
.twocol{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,3vw,40px)}
@media (max-width:760px){.twocol{grid-template-columns:1fr}}
.mail{background:var(--paper-2);border:1px solid var(--line);border-radius:8px;padding:18px 20px;font-size:15px}
.mail .tag{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;text-transform:uppercase;margin-bottom:10px;color:var(--mute)}
.mail .tag.bad{color:var(--bad)} .mail .tag.ok{color:var(--reply)}
.mail p{margin:0 0 10px;max-width:none}
.mail ul{margin:0 0 10px;padding-left:20px}
.mail .sig{color:var(--mute);font-size:13.5px}