/* ==========================================================================
   Stack by Nahal — screen.css
   Full design system. Loaded after critical.css.
   ========================================================================== */

/* ----- Type scale ------------------------------------------------------ */
h1,h2,h3,h4{font-family:var(--serif);font-weight:700;line-height:1.12;letter-spacing:-.012em;color:var(--ink)}
h1{font-size:clamp(1.9rem,1.4rem + 2.4vw,3rem)}
h2{font-size:clamp(1.5rem,1.25rem + 1.2vw,2.1rem);margin-top:2.2em;scroll-margin-top:6rem}
h3{font-size:clamp(1.2rem,1.05rem + .7vw,1.5rem);margin-top:1.8em;scroll-margin-top:6rem}
h4{font-size:1.1rem;margin-top:1.5em}
p{margin-top:1.1em}
.prose > * + *{margin-top:1.1em}
.prose a{border-bottom:1px solid color-mix(in srgb,var(--acid,#c4f000) calc(var(--acid-sat,1)*60%),var(--line-strong));color:var(--ink);transition:border-color .15s,color .15s}
.prose a:hover{border-color:var(--acid,#c4f000);color:var(--acid,#9ab400)}
.prose strong{font-weight:700;color:var(--ink)}
.prose em{font-style:italic}
.prose ul,.prose ol{margin-top:1.1em;padding-left:1.3em}
.prose li{margin-top:.5em}
.prose ul{list-style:square}
.prose li::marker{color:var(--acid,#c4f000)}
small,.eyebrow{font-family:var(--sans);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3)}

/* ----- Layout ---------------------------------------------------------- */
.shell{max-width:var(--maxw);margin:0 auto;padding-inline:var(--gutter)}
.wrap{max-width:var(--measure);margin-inline:auto}
.flow > * + *{margin-top:1.1em}

/* ----- Header / nav ---------------------------------------------------- */
.site-nav{display:flex;align-items:center;gap:1.4rem}
.site-nav a{font-size:.92rem;color:var(--ink-2);font-weight:500;position:relative;padding:.25rem 0}
.site-nav a:hover{color:var(--ink)}
.site-nav a[aria-current="page"]{color:var(--ink)}
.site-nav a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--acid,#c4f000);border-radius:2px}
.nav-toggle{display:none}
.header-actions{display:flex;align-items:center;gap:.6rem}
.icon-btn{display:inline-grid;place-items:center;width:2.25rem;height:2.25rem;border-radius:var(--radius);color:var(--ink-2);transition:background .15s,color .15s}
.icon-btn:hover{background:var(--paper-2);color:var(--ink)}

/* Mobile nav */
@media (max-width:760px){
  .nav-toggle{display:inline-grid}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--paper);border-bottom:1px solid var(--line);
    padding:var(--gutter);transform:translateY(-8px);opacity:0;visibility:hidden;transition:.18s;
  }
  .site-nav.is-open{transform:none;opacity:1;visibility:visible}
  .site-nav a{padding:.65rem 0;border-bottom:1px solid var(--line)}
}

/* ----- Buttons --------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;justify-content:center;
  font-family:var(--sans);font-weight:600;font-size:.92rem;
  padding:.6rem 1.05rem;border-radius:var(--radius);border:1px solid transparent;
  transition:transform .12s,background .15s,border-color .15s,color .15s;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:none}
.btn--primary{background:var(--ink);color:var(--paper)}
.btn--primary:hover{background:color-mix(in srgb,var(--ink) 86%,#000)}
.btn--acid{background:color-mix(in srgb,var(--acid,#c4f000) calc(var(--acid-sat,1)*100%),var(--ink));color:var(--paper);background:var(--acid,#c4f000);color:#0a0a0a}
.btn--acid:hover{filter:brightness(1.06)}
.btn--ghost{border-color:var(--line-strong);color:var(--ink-2)}
.btn--ghost:hover{border-color:var(--ink);color:var(--ink);background:var(--paper-2)}
.btn--lg{padding:.8rem 1.4rem;font-size:1rem}

/* ----- Cards / posts --------------------------------------------------- */
.post-card{
  display:flex;flex-direction:column;gap:.7rem;
  padding:1.1rem;border:1px solid var(--line);border-radius:var(--radius-lg);
  background:var(--paper);transition:border-color .15s,transform .15s,box-shadow .15s;
  height:100%;
}
.post-card:hover{border-color:var(--line-strong);transform:translateY(-2px);box-shadow:var(--shadow)}
.post-card__media{aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;background:var(--paper-2);margin:-1.1rem -1.1rem .2rem}
.post-card__media img{width:100%;height:100%;object-fit:cover}
.post-card__title{font-family:var(--serif);font-size:1.2rem;line-height:1.2}
.post-card:hover .post-card__title{color:var(--ink)}
.post-card__excerpt{color:var(--ink-2);font-size:.95rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.post-card__meta{margin-top:auto;display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;color:var(--ink-3);font-size:.82rem}

.post-grid{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,17rem),1fr))}
.post-grid--feature{grid-template-columns:repeat(auto-fill,minmax(min(100%,22rem),1fr))}

/* Feature row (latest) */
.post-row{display:grid;grid-template-columns:auto 1fr auto;gap:1.25rem;align-items:baseline;padding:1.1rem 0;border-bottom:1px solid var(--line)}
.post-row:hover .post-row__title{color:var(--acid,#9ab400)}
.post-row__date{font-family:var(--mono);font-size:.8rem;color:var(--ink-3);white-space:nowrap}
.post-row__title{font-family:var(--serif);font-size:1.18rem;line-height:1.25;color:var(--ink);transition:color .15s}
.post-row__title:hover{color:var(--acid,#9ab400)}
.post-row__tag{font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);white-space:nowrap}
@media (max-width:600px){.post-row{grid-template-columns:1fr;gap:.25rem}}

/* ----- Section heads --------------------------------------------------- */
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin:3.5rem 0 1.25rem;border-bottom:1px solid var(--line);padding-bottom:.6rem}
.section-head h2{font-family:var(--sans);font-size:.95rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink);margin:0}
.section-head a{font-size:.85rem;color:var(--ink-3)}
.section-head a:hover{color:var(--ink)}

/* ----- Topic rail ------------------------------------------------------ */
.topic-rail{display:grid;grid-template-columns:repeat(4,1fr);gap:.9rem;margin:2.5rem 0}
.topic-rail a{padding:1.4rem 1rem;border:1px solid var(--line);border-radius:var(--radius-lg);display:flex;flex-direction:column;gap:.4rem;background:var(--paper);transition:border-color .15s,transform .15s}
.topic-rail a:hover{border-color:var(--acid,#c4f000);transform:translateY(-2px)}
.topic-rail strong{font-family:var(--serif);font-size:1.15rem}
.topic-rail span{font-size:.82rem;color:var(--ink-3)}
@media (max-width:760px){.topic-rail{grid-template-columns:repeat(2,1fr)}}
@media (max-width:420px){.topic-rail{grid-template-columns:1fr}}

/* ----- Featured hero --------------------------------------------------- */
.hero{padding:3.5rem 0 1rem}
.hero__eyebrow{color:var(--acid,#9ab400);font-weight:600}
.hero h1{margin:.4rem 0 .6rem;max-width:20ch}
.hero p{color:var(--ink-2);max-width:50ch;font-size:1.08rem}
.hero__cta{display:flex;gap:.7rem;margin-top:1.3rem;flex-wrap:wrap}

/* ----- Meta chips ------------------------------------------------------ */
.chip{display:inline-flex;align-items:center;gap:.35rem;font-size:.76rem;letter-spacing:.04em;padding:.2rem .55rem;border-radius:99px;border:1px solid var(--line-strong);color:var(--ink-2);background:var(--paper-2)}
.chip--tag:hover{border-color:var(--acid,#c4f000);color:var(--ink)}
.dot{width:6px;height:6px;border-radius:50%;background:var(--acid,#c4f000);display:inline-block}

/* ----- Post header ----------------------------------------------------- */
.post-header{padding:2.5rem 0 1.5rem;border-bottom:1px solid var(--line);margin-bottom:2rem}
.post-header .eyebrow{color:var(--acid,#9ab400)}
.post-header h1{margin:.5rem 0 .8rem;max-width:24ch}
.post-header__excerpt{color:var(--ink-2);font-size:1.15rem;max-width:52ch}
.post-meta{display:flex;align-items:center;gap:.8rem;flex-wrap:wrap;color:var(--ink-3);font-size:.9rem;margin-top:1.2rem}
.post-meta img,.avatar{width:2.4rem;height:2.4rem;border-radius:50%;object-fit:cover;background:var(--paper-2)}

/* ----- Koenig cards ---------------------------------------------------- */
.kg-card{margin:2rem 0}
.kg-image,.kg-width-wide img,.kg-width-full img{max-width:100%;height:auto;border-radius:var(--radius)}
.kg-width-wide{width:min(100% + 8vw,74rem);margin-inline:calc(min(8vw,4rem) / -2)}
.kg-width-full{width:100vw;position:relative;left:50%;right:50%;margin-left:-50vw;margin-right:-50vw}
.kg-gallery{display:grid;gap:.6rem;grid-template-columns:repeat(var(--cols,3),1fr)}
.kg-gallery img{width:100%;height:100%;object-fit:cover;border-radius:var(--radius)}
.kg-bookmark-card{border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;background:var(--paper)}
.kg-bookmark-container{display:grid;grid-template-columns:1fr 12rem;text-decoration:none}
.kg-bookmark-content{padding:1.1rem;display:flex;flex-direction:column;gap:.5rem}
.kg-bookmark-title{font-family:var(--serif);font-size:1.1rem;color:var(--ink)}
.kg-bookmark-description{color:var(--ink-2);font-size:.9rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.kg-bookmark-metadata{display:flex;align-items:center;gap:.5rem;font-size:.8rem;color:var(--ink-3)}
.kg-bookmark-icon{width:1.25rem;height:1.25rem;border-radius:3px}
.kg-bookmark-author{font-weight:600;color:var(--ink-2)}
.kg-bookmark-publisher{color:var(--ink-3)}
.kg-bookmark-thumbnail img{width:100%;height:100%;object-fit:cover}
@media (max-width:560px){.kg-bookmark-container{grid-template-columns:1fr}.kg-bookmark-thumbnail{order:-1;aspect-ratio:16/9}}

/* Callout */
.kg-callout-card{display:flex;gap:.9rem;padding:1.1rem;border-radius:var(--radius-lg);background:var(--paper-2);border:1px solid var(--line)}
.kg-callout-card .kg-callout-emoji{font-size:1.3rem;line-height:1.4}
.kg-callout-card.kg-callout-card-cyan{background:var(--acid-tint,#eef6c9);border-color:color-mix(in srgb,var(--acid,#c4f000) 40%,var(--line))}
.kg-callout-card div{flex:1}

/* Toggle / accordion */
.kg-toggle-card{border:1px solid var(--line);border-radius:var(--radius-lg);padding:0 1.1rem;background:var(--paper)}
.kg-toggle-heading{padding:1rem 0;display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-weight:600}
.kg-toggle-card ul{margin:0 0 1rem}

/* Blockquote */
.prose blockquote{border-left:3px solid var(--acid,#c4f000);padding:.2rem 0 .2rem 1.1rem;color:var(--ink-2);font-style:italic}
.prose blockquote p{margin:0}

/* Code */
.prose pre{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.1rem;overflow:auto;font-family:var(--mono);font-size:.86rem;line-height:1.6}
.prose code{font-family:var(--mono);font-size:.86em;background:var(--paper-2);padding:.12em .4em;border-radius:3px}
.prose pre code{background:none;padding:0;font-size:inherit}
.prose table{width:100%;border-collapse:collapse;font-size:.92rem;margin-top:1.2em}
.prose th,.prose td{border:1px solid var(--line);padding:.55rem .7rem;text-align:left}
.prose th{background:var(--paper-2);font-family:var(--sans)}
.prose hr{border:0;border-top:1px solid var(--line);margin:2.4em 0}

/* Code copy button */
.code-wrap{position:relative}
.code-copy{position:absolute;top:.5rem;right:.5rem;font-size:.72rem;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-3);background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:.25rem .5rem;opacity:0;transition:.15s}
.code-wrap:hover .code-copy,.code-copy:focus-visible{opacity:1}
.code-copy:hover{color:var(--ink)}

/* ----- Table of contents ---------------------------------------------- */
.toc{position:sticky;top:6rem;align-self:start;font-size:.88rem;max-height:calc(100vh - 8rem);overflow:auto}
.toc__title{font-family:var(--sans);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);margin-bottom:.6rem}
.toc a{display:block;padding:.25rem 0;color:var(--ink-2);border-left:2px solid var(--line);padding-left:.8rem;transition:color .12s,border-color .12s}
.toc a:hover{color:var(--ink)}
.toc a.is-active{color:var(--ink);border-color:var(--acid,#c4f000)}
.toc .lvl-3{padding-left:1.6rem;font-size:.83rem}
@media (max-width:1080px){.toc{display:none}}

/* ----- Post layout (TOC + article) ------------------------------------ */
.post-layout{display:grid;grid-template-columns:1fr;gap:2rem}
@media (min-width:1081px){.post-layout{grid-template-columns:minmax(0,1fr) 16rem}}

/* ----- Author card ----------------------------------------------------- */
.author-card{display:flex;gap:1.1rem;align-items:center;padding:1.4rem;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--paper-2)}
.author-card img{width:3.5rem;height:3.5rem;border-radius:50%}
.author-card h3{margin:0;font-family:var(--serif);font-size:1.1rem}
.author-card p{margin:.3rem 0 0;color:var(--ink-2);font-size:.92rem}

/* ----- Related / pagination ------------------------------------------- */
.related-grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,15rem),1fr))}
.pagination{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin:3rem 0;padding-top:1.4rem;border-top:1px solid var(--line)}
.pagination a{font-weight:600;color:var(--ink-2)}
.pagination a:hover{color:var(--ink)}
.pagination .disabled{color:var(--ink-3);opacity:.5;pointer-events:none}

/* ----- Newsletter ------------------------------------------------------ */
.newsletter{margin:3rem 0;padding:2.2rem;border-radius:var(--radius-lg);background:var(--paper-2);border:1px solid var(--line);text-align:center}
.newsletter h2{margin:0 0 .4rem;font-family:var(--serif);font-size:1.5rem}
.newsletter p{color:var(--ink-2);max-width:42ch;margin-inline:auto}
.subscribe-form{display:flex;gap:.5rem;max-width:30rem;margin:1.3rem auto 0;flex-wrap:wrap;justify-content:center}
.subscribe-form input{flex:1;min-width:14rem;padding:.7rem .9rem;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--paper);color:var(--ink);font:inherit}
.subscribe-form input:focus{outline:none;border-color:var(--acid,#c4f000)}

/* ----- Footer ---------------------------------------------------------- */
.site-footer{margin-top:5rem;border-top:1px solid var(--line);background:var(--paper-2)}
.site-footer__inner{display:grid;gap:2rem;padding:3rem 0;grid-template-columns:1.4fr 1fr 1fr}
.site-footer .wordmark{font-size:1.15rem}
.site-footer p{color:var(--ink-2);font-size:.92rem;max-width:32ch}
.footer-col h3{font-family:var(--sans);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);margin:0 0 .8rem}
.footer-col a{display:block;padding:.3rem 0;color:var(--ink-2);font-size:.92rem}
.footer-col a:hover{color:var(--ink)}
.footer-base{display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;padding:1.2rem 0;border-top:1px solid var(--line);color:var(--ink-3);font-size:.82rem}
@media (max-width:680px){.site-footer__inner{grid-template-columns:1fr}}

/* ----- Custom pages (Now / Stack / Links / Uses) ----------------------- */
.logbook{display:grid;gap:0;border-top:1px solid var(--line)}
.logbook__row{display:grid;grid-template-columns:7rem 1fr;gap:1.2rem;padding:1.1rem 0;border-bottom:1px solid var(--line)}
.logbook__date{font-family:var(--mono);font-size:.82rem;color:var(--ink-3);padding-top:.15rem}
@media (max-width:520px){.logbook__row{grid-template-columns:1fr;gap:.3rem}}
.links-list{display:grid;gap:1rem}
.link-item{display:flex;justify-content:space-between;gap:1rem;align-items:baseline;padding:1rem 1.2rem;border:1px solid var(--line);border-radius:var(--radius-lg);transition:border-color .15s,transform .15s}
.link-item:hover{border-color:var(--acid,#c4f000);transform:translateY(-1px)}
.link-item__meta{color:var(--ink-3);font-size:.82rem;white-space:nowrap}
.uses-grid{display:grid;gap:1.4rem;grid-template-columns:repeat(auto-fill,minmax(min(100%,15rem),1fr))}
.uses-card{border:1px solid var(--line);border-radius:var(--radius-lg);padding:1.2rem;background:var(--paper)}
.uses-card h3{font-family:var(--sans);font-size:.95rem;margin:0 0 .6rem;color:var(--ink-3);letter-spacing:.05em;text-transform:uppercase}
.uses-card ul{list-style:none;padding:0;margin:0;display:grid;gap:.4rem}
.uses-card li{color:var(--ink-2);font-size:.94rem}

/* ----- 404 ------------------------------------------------------------- */
.error-page{padding:6rem 0;text-align:center}
.error-page h1{font-size:clamp(3rem,8vw,6rem);color:var(--acid,#9ab400)}

/* ----- Search overlay -------------------------------------------------- */
.search-overlay{position:fixed;inset:0;z-index:100;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(6px);display:none;padding:6vh var(--gutter)}
.search-overlay.is-open{display:block}
.search-box{max-width:38rem;margin:0 auto;background:var(--paper);border:1px solid var(--line-strong);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden}
.search-box input{width:100%;border:0;padding:1.1rem 1.2rem;font:inherit;background:var(--paper);color:var(--ink);border-bottom:1px solid var(--line)}
.search-results{max-height:60vh;overflow:auto}
.search-result{display:block;padding:.85rem 1.2rem;border-bottom:1px solid var(--line)}
.search-result:hover{background:var(--paper-2)}
.search-result strong{font-family:var(--serif);display:block;font-size:1.02rem}
.search-result span{color:var(--ink-3);font-size:.85rem}
.search-empty{padding:1.4rem 1.2rem;color:var(--ink-3);text-align:center}

/* ----- Members --------------------------------------------------------- */
.member-note{padding:.9rem 1.1rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-2);color:var(--ink-2)}
.member-form{display:flex;gap:.5rem;flex-wrap:wrap;max-width:30rem}
.member-form input{flex:1;min-width:14rem;padding:.7rem .9rem;border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--paper);color:var(--ink);font:inherit}

/* ----- Motion ---------------------------------------------------------- */
@media (prefers-reduced-motion:no-preference){
  .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
  .reveal.is-in{opacity:1;transform:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}

/* ----- Misc ------------------------------------------------------------ */
.skip-link{position:absolute;left:-999px;top:0;z-index:200;background:var(--ink);color:var(--paper);padding:.6rem 1rem;border-radius:var(--radius)}
.skip-link:focus{left:var(--gutter)}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.print-only{display:none}
@media print{
  .site-header,.site-footer,.toc,.newsletter,.reading-progress,.post-footer{display:none!important}
  body{background:#fff;color:#000}
}
.stack-notice{margin-top:2rem;padding:.8rem 1rem;border:1px dashed var(--line-strong);border-radius:var(--radius);color:var(--ink-3);font-size:.88rem;background:var(--paper-2)}