/*
Theme Name: CartStack
Description: SEO-first editorial theme for CartStack.tech. Geist type, zinc neutrals, one emerald accent, dark and light modes.
Version: 2.0.0
Requires at least: 6.0
Requires PHP: 8.0
Text Domain: cartstack
*/
@font-face{font-family:'Geist';src:url(assets/fonts/geist.woff2) format('woff2');font-weight:100 900;font-style:normal;font-display:swap}
@font-face{font-family:'Geist Mono';src:url(assets/fonts/geist-mono.woff2) format('woff2');font-weight:100 900;font-style:normal;font-display:swap}
:root{color-scheme:light;--bg:#F7F7F8;--surface:#FCFCFD;--surface-2:#EFEFF2;--ink:#18181B;--ink-2:#3F3F46;--muted:#5B5B66;--line:#E4E4E7;--line-strong:#D1D1D6;--accent:#059669;--accent-ink:#047857;--accent-soft:rgba(5,150,105,.09);--code-bg:#18181B;--code-ink:#E4E4E7;--tile-ink:#F4F4F5;--tile-muted:#A1A1AA;--shadow:0 1px 2px rgba(24,24,27,.05),0 14px 34px -18px rgba(24,24,27,.28);--r:14px;--r-sm:9px;--sans:'Geist',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;--mono:'Geist Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;--wrap:1160px;--read:720px;--ease-out:cubic-bezier(0.23,1,0.32,1);--ease-in-out:cubic-bezier(0.77,0,0.175,1)}
:root[data-theme=dark]{color-scheme:dark;--bg:#09090B;--surface:#111114;--surface-2:#18181B;--ink:#F4F4F5;--ink-2:#D4D4D8;--muted:#A1A1AA;--line:#232328;--line-strong:#33333A;--accent:#34D399;--accent-ink:#34D399;--accent-soft:rgba(52,211,153,.09);--code-bg:#0E0E11;--code-ink:#E4E4E7;--shadow:0 1px 0 rgba(255,255,255,.03) inset,0 18px 40px -20px rgba(0,0,0,.7)}
@media(prefers-color-scheme:dark){:root:not([data-theme]){color-scheme:dark;--bg:#09090B;--surface:#111114;--surface-2:#18181B;--ink:#F4F4F5;--ink-2:#D4D4D8;--muted:#A1A1AA;--line:#232328;--line-strong:#33333A;--accent:#34D399;--accent-ink:#34D399;--accent-soft:rgba(52,211,153,.09);--code-bg:#0E0E11;--shadow:0 1px 0 rgba(255,255,255,.03) inset,0 18px 40px -20px rgba(0,0,0,.7)}}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:5.5rem}
body{margin:0;background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--accent-ink);text-underline-offset:.2em;text-decoration-thickness:1px}
a:hover{color:var(--ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
::selection{background:var(--accent);color:var(--bg)}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--bg);padding:.6rem 1rem;z-index:99;border-radius:0 0 var(--r-sm) 0}
.skip:focus{left:0}
.wrap{width:min(100% - 2rem,var(--wrap));margin-inline:auto}
.i{width:18px;height:18px;flex:none}
.site-header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 84%,transparent);-webkit-backdrop-filter:saturate(1.4) blur(12px);backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:1.75rem;min-height:64px}
.brand{display:inline-flex;align-items:center;gap:.6rem;color:var(--ink);text-decoration:none;font-weight:600;letter-spacing:-.03em;font-size:1.1rem}
.brand:hover{color:var(--ink)}
.brand .tld{font-family:var(--mono);font-weight:500;color:var(--accent-ink);font-size:.92em;letter-spacing:-.02em}
.brand svg .a{fill:var(--accent)}
.nav{display:flex;gap:1.4rem;overflow-x:auto;scrollbar-width:none;white-space:nowrap}
.nav a{color:var(--muted);text-decoration:none;font-size:.925rem;font-weight:500;padding:.35rem 0;transition:color .16s ease}
.nav a:hover,.nav a[aria-current]{color:var(--ink)}
.tools{margin-left:auto;display:flex;gap:.5rem}
.icon-btn{position:relative;display:inline-grid;place-items:center;width:38px;height:38px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface);color:var(--ink);cursor:pointer;padding:0;transition:border-color .16s ease,transform .14s var(--ease-out)}
.icon-btn:active{transform:scale(.95)}
.theme-toggle .i{position:absolute;transition:transform .24s var(--ease-out),opacity .2s ease}
.theme-toggle .i-sun{opacity:0;transform:rotate(-70deg) scale(.6)}
:root[data-theme=dark] .theme-toggle .i-sun{opacity:1;transform:none}
:root[data-theme=dark] .theme-toggle .i-moon{opacity:0;transform:rotate(70deg) scale(.6)}
@media(prefers-color-scheme:dark){:root:not([data-theme]) .theme-toggle .i-sun{opacity:1;transform:none}:root:not([data-theme]) .theme-toggle .i-moon{opacity:0}}
.btn{display:inline-flex;align-items:center;gap:.5rem;height:46px;padding:0 1.15rem;border-radius:var(--r-sm);font:600 .95rem var(--sans);text-decoration:none;background:var(--ink);color:var(--bg);border:1px solid var(--ink);cursor:pointer;white-space:nowrap;transition:transform .14s var(--ease-out),background-color .16s ease,border-color .16s ease}
.btn:active{transform:scale(.97)}
.btn .i{transition:transform .2s var(--ease-out)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
@media(hover:hover) and (pointer:fine){.icon-btn:hover{border-color:var(--line-strong)}.btn:hover{background:var(--ink-2);border-color:var(--ink-2);color:var(--bg)}.btn:hover .i{transform:translateX(3px)}.btn--ghost:hover{background:var(--surface);border-color:var(--ink-2);color:var(--ink)}}
.tag{position:relative;z-index:2;font:500 .72rem var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--accent-ink);text-decoration:none}
.tag:hover{color:var(--ink)}
.meta{color:var(--muted);font-size:.85rem;display:flex;flex-wrap:wrap;gap:.2rem 1rem;margin-top:auto}
.hero{position:relative;padding:clamp(2rem,5vw,4rem) 0 clamp(2.5rem,6vw,4.5rem);isolation:isolate}
.hero::before{content:'';position:absolute;inset:0;z-index:-1;background-image:radial-gradient(var(--line-strong) 1px,transparent 1.2px);background-size:22px 22px;-webkit-mask-image:radial-gradient(ellipse 75% 85% at 28% 45%,#000 20%,transparent 72%);mask-image:radial-gradient(ellipse 75% 85% at 28% 45%,#000 20%,transparent 72%);opacity:.9}
.hero__grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:clamp(2rem,5vw,4.5rem);align-items:center}
.hero h1{font-size:clamp(2.2rem,4.5vw,3.8rem);line-height:1.03;letter-spacing:-.045em;font-weight:600;margin:0 0 1.15rem;text-wrap:balance;max-width:16ch}
.hero h1 em{font-style:normal;color:var(--accent-ink)}
.lead{font-size:clamp(1.05rem,1.6vw,1.2rem);color:var(--muted);max-width:44ch;margin:0 0 1.75rem;line-height:1.55}
.cta{display:flex;flex-wrap:wrap;gap:.75rem}
.stack{position:relative;margin:1.6rem 1.6rem 0 0}
.hcard{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);color:inherit;text-decoration:none}
.hcard--back{position:absolute;inset:0;z-index:0;background:var(--surface-2);transform:translate(1.4rem,-1.4rem) rotate(2.5deg);transition:transform .4s var(--ease-out)}
.hcard--front{position:relative;z-index:1;transition:transform .4s var(--ease-out)}
.hcard img{width:100%;aspect-ratio:1200/630;object-fit:cover;background:var(--code-bg)}
.hcard__body{padding:1.1rem 1.3rem 1.35rem;display:grid;gap:.55rem}
.hcard__title{font-size:1.3rem;line-height:1.2;letter-spacing:-.025em;font-weight:600;margin:0;color:var(--ink)}
@media(hover:hover) and (pointer:fine){.stack:hover .hcard--back{transform:translate(2rem,-1.9rem) rotate(4deg)}}
.sec{padding:clamp(2.5rem,6vw,4.5rem) 0 0}
.sec h2{font-size:clamp(1.6rem,3vw,2.3rem);letter-spacing:-.035em;line-height:1.1;font-weight:600;margin:0 0 .6rem}
.sec .sub{color:var(--muted);max-width:56ch;margin:0 0 1.75rem}
.bento{display:grid;gap:1rem}
.bento--3{grid-template-columns:1.3fr 1fr;grid-template-rows:auto auto}
.bento--n{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr))}
.tile{position:relative;display:flex;flex-direction:column;justify-content:space-between;gap:2rem;min-height:220px;padding:1.6rem;border-radius:var(--r);border:1px solid var(--line);background:var(--surface);color:var(--ink);text-decoration:none;overflow:hidden;transition:border-color .16s ease}
.tile:hover{color:var(--ink)}
.tile h3{font-size:clamp(1.3rem,2.4vw,1.75rem);letter-spacing:-.03em;line-height:1.15;margin:.35rem 0 .6rem;font-weight:600}
.tile p{margin:0;color:var(--muted);max-width:42ch;font-size:.98rem}
.tile__meta{font:500 .8rem var(--mono);color:var(--muted)}
.tile__foot{display:flex;align-items:center;justify-content:space-between;gap:1rem;font-size:.9rem;color:var(--ink-2)}
.tile__foot .i{color:var(--accent-ink);transition:transform .2s var(--ease-out)}
.tile--a{grid-row:span 2;background-color:var(--accent-soft);background-image:radial-gradient(var(--line-strong) 1px,transparent 1.2px);background-size:20px 20px}
.tile--a h3{font-size:clamp(1.7rem,3.4vw,2.5rem)}
.tile--b{background:var(--code-bg);color:var(--tile-ink);border-color:var(--line-strong)}
.tile--b:hover{color:var(--tile-ink)}
.tile--b p,.tile--b .tile__meta,.tile--b .tile__foot{color:var(--tile-muted)}
.tile--b .tile__foot .i{color:var(--accent)}
@media(hover:hover) and (pointer:fine){.tile:hover{border-color:var(--accent)}.tile:hover .tile__foot .i{transform:translate(3px,-3px)}}
.spot::after{content:'';position:absolute;inset:0;border-radius:inherit;padding:1px;pointer-events:none;background:radial-gradient(220px circle at var(--mx,50%) var(--my,50%),var(--accent),transparent 70%);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask:linear-gradient(#000 0 0) content-box exclude,linear-gradient(#000 0 0);opacity:0;transition:opacity .2s ease}
@media(hover:hover) and (pointer:fine){.spot:hover::after{opacity:1}}
.feed{display:grid;gap:1.25rem;grid-template-columns:repeat(2,minmax(0,1fr))}
.card,.row{position:relative;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:transform .22s var(--ease-out),border-color .16s ease}
@media(hover:hover) and (pointer:fine){.card:hover,.row:hover{transform:translateY(-3px);border-color:var(--line-strong)}}
.card__img{display:block;background:var(--code-bg);aspect-ratio:1200/630;overflow:hidden}
.card__img img{width:100%;height:100%;object-fit:cover}
.card__body{padding:1.15rem 1.3rem 1.35rem;display:flex;flex-direction:column;gap:.55rem;flex:1}
.card__title{font-size:1.15rem;line-height:1.28;letter-spacing:-.02em;font-weight:600;margin:0}
.card__title a{color:var(--ink);text-decoration:none}
.card__title a::after{content:'';position:absolute;inset:0;z-index:1}
.card__excerpt{color:var(--muted);font-size:.95rem;margin:0}
.row:first-child{grid-column:1/-1;flex-direction:row}
.row:first-child .card__img{width:46%;aspect-ratio:auto}
.row:first-child .card__body{justify-content:center;padding:1.6rem 1.8rem}
.row:first-child .card__title{font-size:clamp(1.4rem,2.6vw,2rem);letter-spacing:-.03em;line-height:1.15}
.row:last-child:nth-child(even):not(:first-child){grid-column:1/-1;flex-direction:row}
.row:last-child:nth-child(even):not(:first-child) .card__img{width:38%;aspect-ratio:auto}
.row:last-child:nth-child(even):not(:first-child) .card__body{justify-content:center}
.grid{display:grid;gap:1.25rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr))}
.method{margin-top:1.75rem}
.method__item{padding:1.7rem 0;border-top:1px solid var(--line);display:grid;gap:.55rem}
.method__item:last-child{border-bottom:1px solid var(--line)}
.method__item h3{font-size:clamp(1.4rem,3vw,2.2rem);letter-spacing:-.035em;line-height:1.12;font-weight:600;margin:0;max-width:26ch}
.method__item p{margin:0;color:var(--muted);max-width:58ch}
.crumbs{font-size:.85rem;color:var(--muted);padding:1.4rem 0 0}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--ink)}
.entry-grid{display:grid;grid-template-columns:minmax(0,var(--read));justify-content:center;gap:1.5rem 4.5rem;padding:1rem 0 3.5rem}
.entry-head{margin:.75rem 0 1.75rem}
.entry-head h1{font-size:clamp(2rem,4.6vw,3rem);line-height:1.07;letter-spacing:-.04em;font-weight:600;margin:.6rem 0 1rem;text-wrap:balance}
.progress{position:fixed;inset:0 0 auto 0;height:3px;background:var(--accent);transform-origin:0 50%;transform:scaleX(0);z-index:60;animation:cs-grow linear both;animation-timeline:scroll(root)}
@keyframes cs-grow{to{transform:scaleX(1)}}
@supports not (animation-timeline:scroll(root)){.progress{display:none}}
.toc-wrap{align-self:start}
.toc summary{cursor:pointer;font:500 .72rem var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:.4rem 0;list-style:none}
.toc summary::-webkit-details-marker{display:none}
.toc ol{list-style:none;margin:.5rem 0 0;padding:0;border-left:1px solid var(--line);display:grid;font-size:.9rem}
.toc a{display:block;padding:.4rem 0 .4rem .9rem;margin-left:-1px;border-left:2px solid transparent;color:var(--muted);text-decoration:none;line-height:1.35;transition:color .16s ease,border-color .16s ease}
.toc a:hover{color:var(--ink)}
.toc a[aria-current=true]{color:var(--ink);border-left-color:var(--accent)}
@media(min-width:1100px){.entry-grid.has-toc{grid-template-columns:220px minmax(0,var(--read))}.entry-grid.has-toc .toc-wrap{position:sticky;top:88px;grid-row:1}.toc summary{pointer-events:none}}
.prose{font-size:1.125rem;line-height:1.75;color:var(--ink-2)}
.prose>*{margin-top:0;margin-bottom:1.3rem}
.prose h2{font-size:1.65rem;line-height:1.2;letter-spacing:-.03em;font-weight:600;color:var(--ink);margin-top:3rem;margin-bottom:.9rem}
.prose h3{font-size:1.25rem;line-height:1.3;letter-spacing:-.02em;font-weight:600;color:var(--ink);margin-top:2rem}
.prose strong{color:var(--ink);font-weight:600}
.prose ul,.prose ol{padding-left:1.4rem}
.prose li{margin-bottom:.45rem}
.prose li::marker{color:var(--accent-ink)}
.prose figure{margin-inline:0}
.prose figure img{border-radius:var(--r);border:1px solid var(--line);width:100%}
.prose figcaption{color:var(--muted);font-size:.85rem;margin-top:.6rem}
.prose blockquote{margin-left:0;padding:.2rem 0 .2rem 1.1rem;border-left:3px solid var(--accent);color:var(--muted)}
.prose :not(pre)>code{font:.86em var(--mono);background:var(--surface-2);color:var(--ink);padding:.14em .4em;border-radius:6px;border:1px solid var(--line)}
.prose table{width:100%;border-collapse:collapse;font-size:.95rem;display:block;overflow-x:auto}
.prose th,.prose td{border-bottom:1px solid var(--line);padding:.65rem .8rem;text-align:left;vertical-align:top}
.prose th{color:var(--ink);font-weight:600;background:var(--surface)}
.code{position:relative;margin:0 0 1.5rem}
.code pre{margin:0;background:var(--code-bg);color:var(--code-ink);border:1px solid var(--line-strong);border-radius:var(--r);padding:1.15rem 3.4rem 1.15rem 1.25rem;overflow-x:auto;font:.86rem/1.65 var(--mono);tab-size:2}
.code pre code{background:none;border:0;color:inherit;padding:0;font:inherit}
.copy{display:none;position:absolute;top:.6rem;right:.6rem;width:32px;height:32px;place-items:center;border-radius:8px;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.06);color:#D4D4D8;cursor:pointer;padding:0;transition:transform .14s var(--ease-out),background-color .16s ease}
html.js .copy{display:inline-grid}
.copy:active{transform:scale(.92)}
.copy .i-check{display:none;color:#34D399}
.copy[data-done] .i-copy{display:none}
.copy[data-done] .i-check{display:block}
@media(hover:hover) and (pointer:fine){.copy:hover{background:rgba(255,255,255,.14)}}
.author{margin-top:3rem;padding:1.25rem 1.4rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);font-size:.95rem;color:var(--muted)}
.author strong{color:var(--ink)}
.related{margin-top:3.5rem;padding-top:2.25rem;border-top:1px solid var(--line)}
.related>h2{font-size:1.4rem;letter-spacing:-.03em;margin:0 0 1.25rem;font-weight:600}
.page-title{padding:clamp(2rem,5vw,3.5rem) 0 1.25rem}
.page-title h1{font-size:clamp(2rem,4.5vw,3.2rem);letter-spacing:-.04em;line-height:1.05;font-weight:600;margin:.4rem 0 .6rem}
.page-title p{color:var(--muted);max-width:60ch;margin:0}
.pagination{margin:2.5rem 0 0}
.pagination .nav-links{display:flex;gap:.5rem;flex-wrap:wrap}
.pagination a,.pagination span{padding:.5rem .9rem;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface);text-decoration:none;color:var(--ink);font-size:.92rem}
.pagination .current{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.search-form{display:flex;gap:.5rem;max-width:480px;margin-top:1rem}
.search-form input[type=search]{flex:1;height:46px;padding:0 .9rem;border:1px solid var(--line-strong);border-radius:var(--r-sm);background:var(--surface);color:var(--ink);font:inherit}
.search-form input[type=submit]{height:46px;padding:0 1.1rem;background:var(--ink);color:var(--bg);border:0;border-radius:var(--r-sm);font:600 .95rem var(--sans);cursor:pointer;transition:transform .14s var(--ease-out)}
.search-form input[type=submit]:active{transform:scale(.97)}
.site-footer{border-top:1px solid var(--line);background:var(--surface);padding:3rem 0 2rem;margin-top:clamp(3rem,7vw,5rem);color:var(--muted);font-size:.93rem}
.foot{display:grid;gap:2rem;grid-template-columns:1.6fr 1fr 1fr}
.foot h2{font:500 .72rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--ink);margin:0 0 .85rem}
.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}
.foot a{color:var(--muted);text-decoration:none}
.foot a:hover{color:var(--ink)}
.foot p{max-width:38ch;margin:.9rem 0 0}
.copy-line{margin-top:2.25rem;padding-top:1.25rem;border-top:1px solid var(--line);font-size:.85rem}
html.js .rv{opacity:0;transform:translateY(14px)}
html.js .rv.in{opacity:1;transform:none;transition:opacity .55s var(--ease-out) calc(var(--i,0)*70ms),transform .55s var(--ease-out) calc(var(--i,0)*70ms)}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}.rise{animation:cs-rise .7s var(--ease-out) both;animation-delay:calc(var(--i,0)*90ms)}@keyframes cs-rise{from{opacity:0;transform:translateY(16px)}}::view-transition-old(root),::view-transition-new(root){animation-duration:.24s;animation-timing-function:var(--ease-out)}}
@media(prefers-reduced-motion:reduce){html.js .rv{opacity:1;transform:none}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.progress{display:none}}
@media(max-width:900px){.hero__grid{grid-template-columns:1fr}.bento--3{grid-template-columns:1fr}.tile--a{grid-row:auto}.feed{grid-template-columns:1fr}.row:first-child,.row:last-child:nth-child(even):not(:first-child){flex-direction:column}.row:first-child .card__img,.row:last-child:nth-child(even):not(:first-child) .card__img{width:100%;aspect-ratio:1200/630}.foot{grid-template-columns:1fr}}
@media(max-width:720px){.bar{flex-wrap:wrap;gap:0 1rem;padding-top:.6rem}.nav{order:3;width:100%;padding-bottom:.4rem}.tools{margin-left:auto}.prose{font-size:1.05rem}.stack{margin-right:1rem}}