:root{--bg:#efe3e3;--w:#fff8f8;--ink:#121f0c;--g:#54c71f;--deep:#296b0b;--m:#dff0d3;--mut:#4c5645;--line:#e2d2d2;--r:26px;--gap:12px;
--df:"Urbanist",system-ui,sans-serif;--bf:"Rethink Sans",system-ui,sans-serif;--mf:"Roboto Mono",ui-monospace,Menlo,Consolas,monospace}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.0625rem/1.62 var(--bf);overflow-x:hidden}
[hidden]{display:none!important}
a{color:var(--deep);text-underline-offset:3px;text-decoration-thickness:1.5px}
a:hover{text-decoration-thickness:2.5px}
:focus-visible{outline:3px solid var(--deep);outline-offset:3px;border-radius:8px}
.k :focus-visible,pre.code:focus-visible,.codebox :focus-visible{outline-color:var(--g)}
h1,h2,h3{font-family:var(--df);line-height:1.08;margin:0;letter-spacing:-.02em;text-wrap:balance}
h1{font-weight:800;font-size:clamp(2.05rem,5.2vw,3.05rem)}
h2{font-weight:800;font-size:clamp(1.5rem,3.4vw,1.95rem)}
h3{font-weight:700;font-size:1.22rem;letter-spacing:-.01em}
p{margin:0 0 1em}
code,pre,kbd{font-family:var(--mf)}
.skip{position:absolute;left:12px;top:-80px;z-index:50;background:var(--ink);color:#ffffff;padding:12px 18px;border-radius:14px}
.skip:focus{top:12px}
.col{width:min(100% - 32px,800px);margin-inline:auto}

/* header = three tiles */
.top{position:sticky;top:0;z-index:30;background:var(--bg);padding:12px 0 10px}
.bar{display:flex;gap:8px;align-items:stretch;position:relative}
.logo{display:flex;align-items:center;gap:10px;background:var(--w);border-radius:20px;padding:8px 16px 8px 8px;min-height:56px;color:var(--ink);text-decoration:none;font:800 1.02rem/1.05 var(--df);letter-spacing:-.01em}
.mk{width:40px;height:40px;flex:none;display:block}
.nav{flex:1;display:flex;align-items:center;justify-content:center;gap:2px;background:var(--w);border-radius:20px;padding:6px}
.nav a{display:flex;align-items:center;min-height:44px;padding:0 14px;border-radius:14px;color:var(--ink);text-decoration:none;font-weight:500;font-size:.97rem;white-space:nowrap}
.nav a:hover{background:var(--m)}
.nav a[aria-current]{background:var(--ink);color:#ffffff}
.kt{display:flex;align-items:center;gap:8px;background:var(--g);color:var(--ink);border-radius:20px 20px 20px 20px;padding:0 20px;min-height:56px;font:800 1rem var(--df);text-decoration:none;white-space:nowrap;transition:transform .15s}
.kt::before{content:"";width:14px;height:18px;border-radius:7px 7px 2px 2px;background:var(--ink)}
.kt:hover{transform:translateY(-2px)}
.burger{display:none;width:56px;min-height:56px;border:0;border-radius:20px;background:var(--ink);cursor:pointer;flex:none;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.burger i{display:block;width:20px;height:2px;border-radius:2px;background:#ffffff}

/* bento */
.b{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:var(--gap);counter-reset:s;position:relative}
main{padding:6px 0 0}
.t{border-radius:var(--r);padding:26px;min-width:0;grid-column:span 6}
.s2{grid-column:span 2}.s3{grid-column:span 3}.s4{grid-column:span 4}.s6{grid-column:span 6}
.w{background:var(--w)}
.k{background:var(--ink);color:#f3f5ee}
.g{background:var(--g)}
.m{background:var(--m)}
.k a{color:#a1e67f}
.g a:not(.btn){color:var(--ink)}
.t>:last-child{margin-bottom:0}
.t p,.t li,.t h2,.t h3,h1{overflow-wrap:anywhere}
.lb{font:500 .78rem var(--mf);letter-spacing:.08em;text-transform:uppercase;margin:0 0 14px;opacity:.85}

.ar{display:inline-grid;place-items:center;width:38px;height:44px;border-radius:19px 19px 7px 7px;background:var(--ink);color:#ffffff;font:500 .82rem var(--mf);margin:0 0 16px;flex:none}
.k .ar{background:var(--g);color:var(--ink)}
.g .ar{background:var(--ink);color:#ffffff}

.sh{grid-column:1/-1;display:flex;align-items:flex-end;gap:14px;padding:38px 6px 6px}
.sh::before,.sec>h2:first-child::before{counter-increment:s;content:counter(s,decimal-leading-zero);display:inline-grid;place-items:center;width:38px;height:44px;border-radius:19px 19px 7px 7px;background:var(--ink);color:#ffffff;font:500 .82rem var(--mf);letter-spacing:0;flex:none}
.sh.nn::before{content:"";counter-increment:none;background:var(--g)}
.p-article .sec>h2:first-child::before{content:"";width:14px;height:30px;border-radius:7px 7px 3px 3px;background:var(--g);align-self:flex-start;margin-top:2px}
.p-article .toc a::before{content:"";width:8px;height:11px;border-radius:4px 4px 2px 2px;background:var(--deep)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:0 24px;border:0;border-radius:16px;background:var(--g);color:var(--ink);font:800 1.02rem var(--df);text-decoration:none;cursor:pointer;transition:transform .15s,background .15s}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:none}
.btn.ghost{background:transparent;box-shadow:inset 0 0 0 2px var(--ink);color:var(--ink)}
.btn.ghost:hover{background:var(--m)}
.btn.dk{background:var(--ink);color:#ffffff}
.btn.sm{min-height:44px;padding:0 16px;font-size:.92rem;border-radius:13px}
.acts{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0 0}

/* hero */
.hero{padding:34px 30px 30px;display:flex;flex-direction:column}
.eb{align-self:flex-start;font:500 .78rem var(--mf);letter-spacing:.06em;text-transform:uppercase;background:var(--m);color:var(--ink);padding:7px 12px;border-radius:10px;margin:0 0 20px}
.lead{font-size:1.14rem;line-height:1.55;color:var(--mut);margin:18px 0 0;max-width:60ch}
.hero .acts{margin-top:auto;padding-top:26px}
.gate{border-radius:999px 999px var(--r) var(--r);padding:0;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;overflow:hidden;min-height:380px}
.gate p{font:700 1.02rem/1.2 var(--df);text-align:center;max-width:11ch;margin:auto 0;padding-top:64px}
.gsvg{display:block;width:100%;height:auto;margin-top:14px}
.codet{padding:22px}
.ep{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 0;font:400 .8rem var(--mf)}
.ep span{background:#223017;color:#cee9bf;padding:7px 11px;border-radius:9px;overflow-wrap:anywhere}
.ep.lt{margin-top:22px}
.ep.lt span{background:var(--m);color:var(--ink)}
.bul{display:flex;flex-direction:column}
.bul .ar{position:relative}
.bul .ar::after{content:"";width:13px;height:7px;border-left:2.5px solid var(--g);border-bottom:2.5px solid var(--g);transform:rotate(-45deg) translate(1px,-1px)}
.bul p{font-weight:500;line-height:1.4}
.fact{display:flex;flex-direction:column;justify-content:space-between;gap:18px;min-height:132px;padding:22px}
.fact b{font:800 clamp(1.9rem,5vw,2.5rem)/1 var(--df);letter-spacing:-.03em}
.fact span{font-size:.93rem;line-height:1.3}
.card h3{margin:0 0 10px}
.card p{color:var(--mut);font-size:1rem;line-height:1.55}
.k.card p,.k p{color:#cbd6c3}
.g.card p{color:var(--ink)}
.m.card p{color:#313d2a}

/* code */
.codebox{min-width:0}
.codetabs{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 10px}
.codetabs button{min-height:44px;padding:0 16px;border:0;border-radius:12px;background:#223017;color:#cbd6c3;font:500 .86rem var(--mf);cursor:pointer}
.codetabs button[aria-selected=true]{background:var(--g);color:var(--ink)}
pre.code{position:relative;margin:0 0 1.2em;background:var(--ink);color:#ebf1e6;border-radius:18px;overflow:hidden;max-width:100%;font-size:.86rem;line-height:1.65}
.k pre.code{background:#0b1708}
pre.code code{display:block;overflow-x:auto;padding:54px 20px 20px;white-space:pre;-webkit-overflow-scrolling:touch}
.codebox pre.code{margin:0}
pre.code .k{background:none;color:#a1e67f}
pre.code .s{color:#f28a90}
pre.code .c{color:#95a58a}
.copy{position:absolute;top:6px;right:6px;min-height:44px;padding:0 14px;border:0;border-radius:12px;background:#293a1d;color:#ebf1e6;font:500 .78rem var(--mf);cursor:pointer}
.copy:hover{background:var(--g);color:var(--ink)}

/* prose */
.prose{padding:30px 30px 32px}
.prose h2{margin:0 0 18px;display:flex;align-items:flex-end;gap:14px}
.prose h3{margin:1.6em 0 .5em}
.prose p,.prose li{max-width:68ch}
.prose ul,.prose ol{padding-left:1.25em;margin:0 0 1.1em}
.prose li{margin:.35em 0}
.prose li::marker{color:var(--deep);font-weight:700}
.prose :not(pre)>code{background:var(--m);padding:.12em .4em;border-radius:6px;font-size:.88em;overflow-wrap:anywhere}
.prose table{display:block;max-width:100%;overflow-x:auto;border-collapse:separate;border-spacing:0;margin:0 0 1.2em;font-size:.95rem}
.prose th,.prose td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.prose th{background:var(--ink);color:#ffffff;font:700 .9rem var(--df);white-space:nowrap}
.prose th:first-child{border-radius:12px 0 0 12px}.prose th:last-child{border-radius:0 12px 12px 0}
.prose blockquote{margin:0 0 1.1em;padding:16px 20px;background:var(--m);border-radius:16px}

/* page heads */
.hd1{padding:28px 30px 30px}
.cr{display:flex;flex-wrap:wrap;align-items:center;gap:9px;font:500 .78rem var(--mf);letter-spacing:.04em;margin:0 0 20px}
.cr a{color:var(--deep);min-height:28px;display:inline-flex;align-items:center}
.cr i{width:9px;height:12px;border-radius:5px 5px 2px 2px;background:var(--g)}
.cr span{background:var(--m);padding:5px 10px;border-radius:9px}
.up{display:inline-block;margin:22px 0 0;font:500 .8rem var(--mf);background:var(--m);padding:7px 12px;border-radius:10px}
.tk{display:flex;gap:16px;align-items:flex-start;padding:22px}
.tk .ar{margin:0}
.tk p{font-weight:500;line-height:1.45;font-size:1rem}
.k.tk p{color:#f3f5ee}

/* toc */
.tocw{grid-column:1/-1;min-width:0}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:tc;columns:2;column-gap:22px}
.toc li{counter-increment:tc;break-inside:avoid}
.toc a{display:flex;gap:10px;align-items:baseline;min-height:44px;padding:9px 0;color:var(--ink);text-decoration:none;font-weight:500;font-size:.96rem;line-height:1.3}
.toc a::before{content:counter(tc,decimal-leading-zero);font:500 .76rem var(--mf);color:var(--deep);flex:none}
.toc a:hover{text-decoration:underline}

/* faq */
.qa{padding:0}
.qa summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 22px 20px 26px;min-height:64px;font:700 1.1rem/1.25 var(--df);border-radius:var(--r)}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"";flex:none;width:34px;height:38px;border-radius:17px 17px 6px 6px;background:var(--m) linear-gradient(var(--ink),var(--ink)) center/12px 2px no-repeat;transition:background-color .15s}
.qa[open] summary::after{background-color:var(--g)}
.qa:not([open]) summary::after{background-image:linear-gradient(var(--ink),var(--ink)),linear-gradient(var(--ink),var(--ink));background-size:12px 2px,2px 12px;background-position:center,center;background-repeat:no-repeat}
.qa p{padding:0 26px 24px;margin:0;color:var(--mut);max-width:70ch}

/* cta + footer */
.ctab{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:34px 30px;margin-top:26px;border-radius:120px var(--r) var(--r) var(--r)}
.ctab h2{margin:0 0 8px}
.ctab p{margin:0;max-width:44ch}
.ctab>div{padding-left:26px}
.ctab .btn{flex:none}
.ft{padding:12px 0 40px}
.fb .logo{background:none;padding:0;color:#ffffff;min-height:0;margin:0 0 16px}
.fb p{margin:0 0 6px}
.fb .lg{font-size:.86rem;margin-top:18px;color:#bec9b4}
.fl ul{list-style:none;margin:0;padding:0}
.fl a{display:flex;align-items:center;min-height:44px;color:var(--ink);font-weight:500;font-size:.96rem;line-height:1.25;text-decoration:none}
.fl a:hover{text-decoration:underline}

/* key page */
.kl{display:flex;flex-direction:column;gap:var(--gap);min-width:0}
.kl .kh{flex:1}
.kh h1{font-size:clamp(1.9rem,4vw,2.5rem)}
.kf ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:18px 14px}
.kf b{display:block;font:800 1.5rem/1 var(--df);color:var(--g);letter-spacing:-.02em}
.kf span{display:block;font-size:.84rem;line-height:1.3;color:#cbd6c3;margin-top:6px}
.keyt{border-radius:190px 190px var(--r) var(--r);padding:0 26px 26px;scroll-margin-top:90px}
.arch{width:96px;height:104px;margin:0 auto 14px;border-radius:0 0 12px 12px;display:grid;place-items:center;color:var(--ink)}
.arch svg{width:54px;height:54px;margin-top:34px}
.form{min-width:0}
.tabs2{display:flex;gap:4px;background:var(--bg);border-radius:16px;padding:4px;margin:0 0 18px}
.tabs2 button{flex:1;min-height:44px;border:0;border-radius:12px;background:transparent;color:var(--mut);font:700 .98rem var(--df);cursor:pointer}
.tabs2 button[aria-selected=true]{background:var(--ink);color:#ffffff}
.msg{border-radius:14px;padding:12px 14px;margin:0 0 14px;background:var(--m);font-size:.95rem;font-weight:500}
.msg:empty{display:none}
.msg.err{background:#fddaeb;color:#8a0856}
.row{margin:0 0 14px}
.row label,.calc label{display:block;font:700 .92rem var(--df);margin:0 0 6px}
.row input,.calc input{width:100%;min-height:52px;padding:0 16px;border:2px solid var(--line);border-radius:14px;background:#ffffff;color:var(--ink);font:500 1rem var(--bf)}
.row input:focus,.calc input:focus{outline:none;border-color:var(--deep);box-shadow:0 0 0 4px var(--m)}
.note{font-size:.84rem;line-height:1.45;color:var(--mut);margin:8px 0 0}
.form .btn[data-submit]{width:100%;min-height:56px;margin-top:6px;font-size:1.08rem}
.keyout{display:none}
.keyout.on{display:block}
.keyout h3{margin:0 0 12px}
.keybox{display:flex;gap:10px;align-items:center;background:var(--ink);color:#a1e67f;border-radius:16px;padding:10px 10px 10px 16px;font:500 .86rem var(--mf);word-break:break-all;margin:0 0 6px}
.keybox span{flex:1;min-width:0}
.keybox .btn{flex:none}
.keyout>p{font-size:.95rem;margin:14px 0}
.keyout code{background:var(--m);padding:.12em .4em;border-radius:6px;font-size:.84em;overflow-wrap:anywhere}
.keyout .acts{margin-top:14px;gap:8px}
.mut{color:var(--mut)}

/* calculator */
.calct h2{margin:0 0 18px}
.calc{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.calc>div{background:var(--w);border-radius:18px;padding:16px;min-width:0;display:flex;flex-direction:column;justify-content:space-between}
.calc>div:last-child{background:var(--ink);color:#ffffff;border-radius:90px 90px 18px 18px;text-align:center;padding-top:26px}
.calc output{display:block;font:800 2rem/1.1 var(--df);color:var(--g);min-height:52px;display:grid;place-items:center;overflow-wrap:anywhere}

/* 404 */
.p-404{padding-top:20px}

@media(min-width:1380px){
.tocw{position:absolute;right:calc(100% + 16px);top:0;bottom:0;width:250px}
.toc{position:sticky;top:92px;max-height:calc(100vh - 110px);overflow:auto;padding:22px}
.toc ol{columns:1}
.toc a{min-height:0;padding:7px 0;font-size:.9rem}
}
@media(max-width:760px){
.nav{display:none;position:absolute;left:0;right:0;top:calc(100% + 8px);flex-direction:column;align-items:stretch;padding:8px;box-shadow:0 18px 40px rgba(18,31,12,.18)}
.nav.open{display:flex}
.nav a{min-height:48px}
.burger{display:flex}
.logo{flex:1;min-width:0}
.kt{padding:0 14px;font-size:.92rem}
}
@media(max-width:700px){
:root{--r:22px;--gap:10px}
body{font-size:1rem}
.col{width:min(100% - 24px,800px)}
.s2,.s3,.s4{grid-column:span 6}
.fact,.tk.s3{grid-column:span 3}
.fact.f0{grid-column:span 6}
.tk.s3{grid-column:span 6}
.t{padding:22px}
.hero,.hd1,.prose{padding:24px 22px 26px}
.qa{padding:0}
.gate{min-height:0;border-radius:150px 150px var(--r) var(--r);padding:0 40px}
.gate p{padding-top:56px;max-width:14ch;margin:0}
.gsvg{max-width:230px}
.fact{min-height:112px}
.ctab{flex-direction:column;align-items:flex-start;border-radius:90px var(--r) var(--r) var(--r);padding:44px 22px 24px}
.ctab>div{padding-left:0;padding-top:10px}
.ctab .btn{width:100%}
.toc ol{columns:1}
.kl{display:contents}
.p-home>.hero{order:-3}.p-home>.codet{order:-2}.p-home>.gate{order:-1}
.kh{order:1}.keyt{order:2;grid-column:span 6;border-radius:150px 150px var(--r) var(--r);padding:0 20px 22px}
.kf{order:3}
.p-key>:not(.kl):not(.keyt){order:4}
.calc{grid-template-columns:1fr}
.calc>div:last-child{border-radius:18px;padding-top:16px}
.sh{padding-top:28px}
.keyout .acts .btn{flex:1 1 100%}
}
@media(max-width:400px){
.logo{font-size:.9rem;padding-right:10px;gap:8px}
.kt{padding:0 12px;font-size:.86rem}
.kt::before{display:none}
.burger{width:50px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}html{scroll-behavior:auto}}