:root{--paper:#eef2dc;--paper2:#e2e8c6;--ink:#14180a;--mut:#465033;--lime:#b0f019;--olive:#3f5805;--line:#14180a;
--serif:"Noto Serif SC","Songti SC","SimSun",serif;--sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;--mono:"JetBrains Mono","Noto Sans SC","PingFang SC","Microsoft YaHei",ui-monospace,Consolas,monospace}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.85 var(--sans);overflow-wrap:break-word}
img,svg{max-width:100%}
a{color:var(--olive);text-decoration-thickness:2px;text-underline-offset:3px}
a:hover{color:var(--ink)}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
h1,h2,h3{font-family:var(--serif);font-weight:900;margin:0;line-height:1.14;overflow-wrap:anywhere}
p{margin:0 0 1.1em}
ul,ol{margin:0;padding:0}
code{font-family:var(--mono);font-size:.9em}
.skip{position:absolute;left:8px;top:-80px;z-index:50;background:var(--ink);color:var(--lime);padding:12px 16px;font-weight:700}
.skip:focus{top:8px}
.col{width:min(100% - 40px,640px);margin-inline:auto;position:relative;min-width:0}

/* header: letterhead */
.top{position:sticky;top:0;z-index:30;background:var(--paper);border-bottom:3px solid var(--ink)}
.top-in{width:min(100% - 32px,800px);margin-inline:auto;display:flex;align-items:center;gap:12px;min-height:64px;position:relative}
.logo{display:inline-flex;align-items:center;gap:8px;color:var(--ink);text-decoration:none;font:900 1.12rem/1 var(--serif);min-height:44px;white-space:nowrap;margin-right:auto}
.logo-m{width:40px;height:26px;flex:none;background:var(--ink);color:var(--lime);padding:5px 4px}
.nav{display:flex;gap:2px}
.nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;color:var(--ink);text-decoration:none;font-weight:700;font-size:.95rem}
.nav a:hover{background:var(--paper2)}
.nav a[aria-current]{box-shadow:inset 0 -5px 0 var(--lime)}
.burger{display:none;width:44px;height:44px;flex:none;background:none;border:2px solid var(--ink);padding:0 9px;cursor:pointer}
.burger i{display:block;height:3px;background:var(--ink);margin:5px 0}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 26px;background:var(--ink);color:var(--lime);border:2px solid var(--ink);border-radius:0;font:700 1rem/1.2 var(--sans);text-decoration:none;cursor:pointer;text-align:center}
.btn:hover{background:var(--lime);color:var(--ink)}
.btn.sm{min-height:44px;padding:0 16px;font-size:.92rem}
.btn.big{min-height:64px;padding:0 34px;font-size:1.15rem;box-shadow:8px 8px 0 var(--lime)}
.btn.big:hover{box-shadow:8px 8px 0 var(--ink)}
.btn.ghost{background:transparent;color:inherit;border-color:currentColor}
.btn[disabled]{opacity:.6;cursor:wait}
.lnk{display:inline-flex;align-items:center;min-height:44px;font-weight:700;color:var(--ink)}
.lnk::after{content:"\2192";margin-left:.4em}

/* hero */
.hero{position:relative;overflow:hidden;padding:72px 0 24px}
.loop{position:absolute;left:50%;top:10px;width:1240px;max-width:none;transform:translateX(-50%);color:var(--lime);z-index:0;pointer-events:none}
.hero .col{z-index:1}
.eyebrow,.cap,.crumbs,.date{font:700 .82rem/1.5 var(--mono);letter-spacing:.06em;text-transform:uppercase}
.eyebrow{display:inline-block;background:var(--ink);color:var(--lime);padding:6px 12px;margin-bottom:28px}
h1{font-size:clamp(2.55rem,11.4vw,5.1rem);letter-spacing:-.01em;line-height:1.1}
h1.h1-m{font-size:clamp(2.2rem,9vw,3.6rem)}
.lead{font-size:1.18rem;line-height:1.8;margin:28px 0 0;color:var(--ink)}
.ticks{list-style:none;margin:28px 0 0;border-top:3px solid var(--ink)}
.ticks li{padding:12px 0 12px 34px;border-bottom:1px solid var(--ink);position:relative;font-weight:700}
.ticks li::before{content:"";position:absolute;left:0;top:1.25em;width:20px;height:8px;background:var(--ink)}
.acts{display:flex;flex-wrap:wrap;align-items:center;gap:20px 28px;margin-top:36px}

/* sections */
.sec{padding:64px 0}
.sec h2{font-size:clamp(2rem,8.4vw,3.5rem);margin-bottom:32px}
.num{display:block;font:900 3.2rem/1 var(--serif);color:var(--lime);-webkit-text-stroke:2px var(--ink);margin-bottom:10px}
.sec+.sec .col::before{content:"";display:block;height:3px;background:var(--ink);margin-bottom:56px}
.sec+.sec{padding-top:0}
.cap{margin-bottom:12px;color:var(--mut)}
.phero,.khero{padding:36px 0 56px}
.crumbs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:26px;color:var(--mut)}
.crumbs a{color:var(--mut);display:inline-flex;align-items:center;min-height:44px}
.crumbs span{display:inline-flex;align-items:center;min-height:44px}
.khero .lead{margin-bottom:30px}
.khero h1.h1-m{font-size:clamp(2.1rem,8.4vw,3.2rem)}

/* code */
pre.code{position:relative;margin:1.6em 0;background:var(--ink);color:#eef2dc;padding:46px 0 0;overflow:hidden;max-width:100%}
pre.code::before{content:"";position:absolute;inset:0 0 auto 0;height:46px;background:#262c14;border-bottom:1px solid #3d4622}
pre.code code{display:block;overflow-x:auto;padding:18px 20px 22px;font:400 .86rem/1.75 var(--mono);white-space:pre;tab-size:2}
pre.code:focus-visible{outline-offset:2px}
.copy{position:absolute;top:1px;right:0;min-height:44px;min-width:64px;padding:0 14px;background:transparent;color:var(--lime);border:0;border-left:1px solid #3d4622;font:700 .82rem/1 var(--sans);cursor:pointer}
.copy:hover{background:var(--lime);color:var(--ink)}
.copy:focus-visible,.codetabs button:focus-visible,.form :focus-visible,.slab :focus-visible{outline-color:var(--lime)}
.code .k{color:var(--lime)}.code .s{color:#ffd76a}.code .c{color:#aab392}
.codebox{background:var(--ink);box-shadow:10px 10px 0 var(--lime);margin-bottom:10px}
.codetabs{display:flex;border-bottom:1px solid #3d4622}
.codetabs button{flex:1;min-height:48px;background:transparent;color:#eef2dc;border:0;border-right:1px solid #3d4622;font:700 .88rem/1 var(--mono);cursor:pointer}
.codetabs button:last-child{border-right:0}
.codetabs button[aria-selected="true"]{background:var(--lime);color:var(--ink)}
.codebox pre.code{margin:0}

/* facts */
.facts{margin:44px 0 0;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));border-top:3px solid var(--ink)}
.facts div{display:flex;flex-direction:column-reverse;justify-content:flex-end;padding:14px 12px 14px 0;border-bottom:1px solid var(--ink);grid-column:span 2;min-width:0}
.facts div:nth-child(-n+2){grid-column:span 3}
.facts dd{margin:0;font:900 2rem/1.1 var(--serif)}
.facts div:nth-child(-n+2) dd{font-size:3rem}
.facts dt{font-size:.82rem;line-height:1.45;color:var(--mut);margin-top:6px}
.facts-poster div:nth-child(-n+2){grid-column:span 6;padding:18px 0}
.facts-poster div:nth-child(-n+2) dd{font-size:clamp(4.6rem,25vw,9.5rem);line-height:.95;letter-spacing:-.03em}
.facts-poster div:nth-child(1) dd{background:linear-gradient(transparent 58%,var(--lime) 58%,var(--lime) 90%,transparent 90%);align-self:flex-start;padding-right:.08em}
.facts-poster dt{font-size:.95rem}
.facts-poster div:nth-child(-n+2) dt{margin-top:.9rem}
.sub{font:900 1.35rem/1.5 var(--serif);margin:26px 0 0;padding-left:16px;border-left:8px solid var(--lime)}

/* features / benefits */
.feat{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:0 36px}
.feat li{padding:20px 0 6px;border-top:1px solid var(--ink);min-width:0}
.feat li:nth-child(-n+2){border-top:3px solid var(--ink)}
.feat h3{font-size:1.28rem;line-height:1.35;margin-bottom:8px}
.feat p,.steps p,.uses p{color:var(--mut);font-size:.98rem;line-height:1.8}
/* steps */
.steps{list-style:none;counter-reset:s}
.steps li{counter-increment:s;display:grid;grid-template-columns:96px minmax(0,1fr);column-gap:8px;padding:22px 0 8px;border-top:1px solid var(--ink)}
.steps li:first-child{border-top:3px solid var(--ink)}
.steps li::before{content:counter(s);grid-row:1/3;font:900 5.4rem/.9 var(--serif);color:var(--ink)}
.steps h3{font-size:1.4rem;line-height:1.35;margin-bottom:8px}
.steps p{grid-column:2}
/* use cases / examples */
.uses{list-style:none}
.uses li{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:6px 28px;padding:22px 0 8px;border-top:1px solid var(--ink)}
.uses li:first-child{border-top:3px solid var(--ink)}
.uses h3{font-size:1.3rem;line-height:1.4}

/* prose */
.prose{font-size:1.02rem}
.prose h2{font-size:clamp(1.7rem,6.6vw,2.6rem);margin:1.9em 0 .7em;padding-top:.5em;border-top:3px solid var(--ink);scroll-margin-top:84px}
.prose>h2:first-child{margin-top:0}
.sec+.sec-prose .prose>h2:first-child{border-top:0;padding-top:0}
.prose h3{font-size:1.3rem;line-height:1.4;margin:1.7em 0 .5em}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.4em}
.prose li{margin-bottom:.4em}
.prose li::marker{font-weight:700;color:var(--olive)}
.prose strong{font-weight:700;background:linear-gradient(transparent 62%,var(--lime) 62%)}
.prose :not(pre)>code{background:var(--paper2);padding:.12em .4em;border:1px solid #c5cea2;overflow-wrap:anywhere}
.prose table{display:block;overflow-x:auto;max-width:100%;border-collapse:collapse;margin:1.6em 0;font-size:.95rem;line-height:1.6;border-top:3px solid var(--ink)}
.prose th,.prose td{padding:12px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--ink);min-width:7.5em}
.prose th{background:var(--ink);color:var(--lime);font-weight:700}
.prose blockquote{margin:1.4em 0;padding:4px 0 4px 18px;border-left:8px solid var(--lime);font-family:var(--serif);font-weight:900;font-size:1.2rem}

/* toc */
.toc{width:min(100% - 40px,640px);margin:0 auto 40px;border:3px solid var(--ink);padding:18px 20px 12px;background:var(--paper2)}
.toc-h{font:700 .82rem/1.4 var(--mono);letter-spacing:.06em;margin:0 0 6px}
.toc ol{list-style:none;counter-reset:t}
.toc li{counter-increment:t;border-top:1px solid #a9b384}
.toc li:first-child{border-top:0}
.toc a{display:flex;gap:10px;align-items:baseline;min-height:44px;padding:9px 0;color:var(--ink);text-decoration:none;font-size:.95rem;line-height:1.5}
.toc a::before{content:counter(t,decimal-leading-zero);font:700 .8rem/1 var(--mono);color:var(--olive);flex:none}
.toc a:hover{text-decoration:underline}
.base{display:flex;flex-wrap:wrap;gap:10px;margin:28px 0 0}
.base code{background:var(--ink);color:var(--lime);padding:8px 12px;font-size:.86rem;overflow-wrap:anywhere;min-width:0}

/* article */
.date{color:var(--mut);margin:26px 0 0}
.take{margin-top:28px;background:var(--lime);border:3px solid var(--ink);padding:24px 24px 14px;box-shadow:10px 10px 0 var(--ink)}
.take h2{font-size:1.6rem;margin-bottom:10px}
.take ol{list-style:none;counter-reset:k}
.take li{counter-increment:k;display:grid;grid-template-columns:44px minmax(0,1fr);padding:12px 0;border-top:1px solid var(--ink);font-weight:700;line-height:1.7}
.take li::before{content:counter(k);font:900 1.9rem/1 var(--serif)}

/* signup slab */
.form{background:var(--ink);color:#eef2dc;padding:26px 26px 22px;box-shadow:12px 12px 0 var(--lime)}
.tabs2{display:grid;grid-template-columns:1fr 1fr;margin-bottom:20px;border:2px solid #5d6839}
.tabs2 button{min-height:48px;background:transparent;color:#eef2dc;border:0;font:700 1rem/1.2 var(--sans);cursor:pointer}
.tabs2 button[aria-selected="true"]{background:var(--lime);color:var(--ink)}
.msg:empty{display:none}
.msg{margin-bottom:16px;padding:12px 14px;border-left:6px solid var(--lime);background:#262c14;font-weight:700;line-height:1.6}
.msg.err{border-left-color:#ff8a75;background:#32130d;color:#ffd0c7}
.row{margin-bottom:16px}
.row label,.calc label{display:block;font-weight:700;font-size:.9rem;line-height:1.4;margin-bottom:6px}
.row input,.calc input{display:block;width:100%;height:54px;padding:0 14px;background:var(--paper);color:var(--ink);border:2px solid var(--paper);border-radius:0;font:400 1.05rem/1 var(--mono)}
.row input:focus-visible{outline:4px solid var(--lime);outline-offset:0;border-color:var(--ink)}
.form .note{font-size:.86rem;line-height:1.6;color:#cdd5ae;margin:8px 0 0}
.form .btn{background:var(--lime);color:var(--ink);border-color:var(--lime)}
.form .btn:hover{background:var(--paper);border-color:var(--paper)}
.form [data-submit]{width:100%;min-height:60px;font-size:1.1rem;margin-top:4px}
.form .btn.ghost{background:transparent;color:#eef2dc;border-color:#8b9763}
.form .btn.ghost:hover{background:#eef2dc;color:var(--ink)}
.keyout{display:none}
.keyout.on{display:block}
.keyout h3{font-size:1.7rem;color:var(--lime);margin-bottom:14px}
.keybox{display:flex;align-items:center;gap:12px;background:#262c14;border:2px solid var(--lime);padding:10px 10px 10px 14px}
.keybox span{flex:1;min-width:0;font:700 .98rem/1.5 var(--mono);color:var(--lime);word-break:break-all}
.keybox .btn{flex:none}
.keyout p{margin:14px 0 0;line-height:2}
.keyout code{color:var(--lime);word-break:break-all}
.mut{color:#cdd5ae}
.keyout .acts{margin-top:18px;gap:10px}

/* calculator */
.calc{display:grid;grid-template-columns:1fr 1fr;gap:18px 20px;background:var(--lime);border:3px solid var(--ink);padding:24px;box-shadow:10px 10px 0 var(--ink)}
.calc div{min-width:0}
.calc div:last-child{grid-column:1/-1;border-top:3px solid var(--ink);padding-top:14px}
.calc input{border-color:var(--ink)}
.calc output{display:block;font:900 clamp(3.4rem,17vw,6.4rem)/1 var(--serif);letter-spacing:-.02em;overflow-wrap:anywhere}

/* faq */
.faq{border-bottom:3px solid var(--ink)}
.faq details{border-top:1px solid var(--ink)}
.faq details:first-child{border-top:3px solid var(--ink)}
.faq summary{list-style:none;position:relative;cursor:pointer;padding:18px 48px 18px 0;min-height:44px;font:900 1.18rem/1.5 var(--serif)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:14px;width:34px;height:34px;display:grid;place-items:center;background:var(--ink);color:var(--lime);font:700 1.3rem/1 var(--mono)}
.faq details[open] summary::after{content:"\2212";background:var(--lime);color:var(--ink)}
.faq details p{margin:0 0 20px;color:var(--mut)}

/* closing slab */
.slab{position:relative;overflow:hidden;background:var(--ink);color:#eef2dc;padding:44px 30px 40px}
.slab-loop{position:absolute;right:-90px;bottom:-70px;width:420px;max-width:none;color:#2c3416;pointer-events:none}
.slab h2{position:relative;color:var(--lime);font-size:clamp(1.9rem,7.6vw,3rem);margin-bottom:16px}
.slab p{position:relative;font-size:1.05rem;margin-bottom:26px}
.slab .btn{position:relative;background:var(--lime);color:var(--ink);border-color:var(--lime);min-height:60px;font-size:1.1rem}
.slab .btn:hover{background:var(--paper);border-color:var(--paper)}
.sec-close .col::before{display:none!important}

/* 404 */
.nf-n{font:900 clamp(7rem,38vw,15rem)/.85 var(--serif);color:var(--lime);-webkit-text-stroke:3px var(--ink);margin:10px 0 24px;letter-spacing:-.04em}
.nf-l{list-style:none;display:flex;flex-wrap:wrap;gap:0 22px;margin:22px 0 30px;border-top:3px solid var(--ink);border-bottom:1px solid var(--ink)}
.nf-l a{display:inline-flex;align-items:center;min-height:48px;font-weight:700;color:var(--ink)}

/* footer */
.foot{margin-top:40px;background:var(--paper2);border-top:6px solid var(--ink);padding:44px 0 36px;overflow:hidden}
.foot-b{font:900 clamp(1.9rem,10.2vw,5.1rem)/1 var(--serif);letter-spacing:-.02em;margin:0 0 28px;white-space:nowrap}
.foot-l{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:0 28px;border-top:3px solid var(--ink)}
.foot-l li{border-bottom:1px solid var(--ink);min-width:0}
.foot-l a{display:flex;align-items:center;min-height:48px;padding:8px 0;color:var(--ink);text-decoration:none;font-weight:700;font-size:.95rem;line-height:1.45}
.foot-l a:hover{text-decoration:underline}
.legal{margin:24px 0 0;font-size:.84rem;line-height:1.7;color:var(--mut)}

/* desktop: break-outs and margin furniture */
@media (min-width:900px){
.wide{margin-inline:-56px}
.form{padding:32px 36px 28px}
}
@media (min-width:1100px){
.num{position:absolute;right:100%;top:-10px;margin:0 40px 0 0;font-size:7.5rem;line-height:.8}
.sec+.sec .num{top:46px}
}
@media (min-width:1240px){
.lt{display:grid;grid-template-columns:minmax(0,1fr) 640px minmax(0,1fr)}
.lt .toc{grid-column:1;justify-self:end;align-self:start;width:250px;margin:0 52px 0 0;position:sticky;top:96px;background:transparent;border:0;border-top:3px solid var(--ink);padding:14px 0 0}
.lt .toc a{min-height:0;padding:8px 0;font-size:.9rem}
.lt>.col{grid-column:2;width:640px;margin:0}
}

/* mobile */
@media (max-width:760px){
body{font-size:16px}
.top-in{gap:8px;min-height:60px}
.logo{font-size:1rem;gap:6px}
.logo-m{width:34px;height:24px}
.burger{display:block}
.nav{display:none;position:absolute;left:-16px;right:-16px;top:100%;flex-direction:column;gap:0;background:var(--paper);border-top:3px solid var(--ink);border-bottom:3px solid var(--ink);padding:0 16px}
.nav.open{display:flex}
.nav a{min-height:52px;padding:0;border-bottom:1px solid var(--ink);font-size:1.05rem}
.nav a:last-child{border-bottom:0}
.top .btn.key{padding:0 12px;font-size:.86rem}
.hero{padding:44px 0 16px}
.loop{width:560px;top:64px}
.sec{padding:48px 0}
.sec+.sec .col::before{margin-bottom:40px}
.feat{grid-template-columns:1fr}
.feat li:nth-child(2){border-top-width:1px}
.steps li{grid-template-columns:64px minmax(0,1fr)}
.steps li::before{font-size:3.8rem}
.uses li{grid-template-columns:1fr}
.facts div{grid-column:span 3}
.facts div:nth-child(-n+2){grid-column:span 3}
.facts-row div:nth-child(-n+2) dd{font-size:2.4rem}
.facts div:last-child{grid-column:span 6}
.facts-poster div:nth-child(-n+2){grid-column:span 6}
.calc{grid-template-columns:1fr;padding:18px;box-shadow:6px 6px 0 var(--ink)}
.form{padding:20px 18px;box-shadow:6px 6px 0 var(--lime)}
.codebox{box-shadow:6px 6px 0 var(--lime)}
.take{box-shadow:6px 6px 0 var(--ink);padding:20px 18px 10px}
.btn.big{width:100%}
.slab{padding:34px 22px}
.slab .btn{width:100%}
.keybox{flex-direction:column;align-items:stretch}
.phero,.khero{padding:20px 0 44px}
.crumbs{margin-bottom:14px}
}
@media (max-width:380px){
.logo span{font-size:.92rem}
.top .btn.key{padding:0 9px;font-size:.8rem}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}