/* Seroix v1 · dark, technical, minimal. One accent. No gradients, no blur. */
@font-face{font-family:"Inter";src:url(/assets/fonts/inter-latin-wght.woff2) format("woff2");font-weight:100 900;font-display:swap}
@font-face{font-family:"JetBrains Mono";src:url(/assets/fonts/jbmono-latin-wght.woff2) format("woff2");font-weight:100 800;font-display:swap}

:root{
  --bg:#121416;--surface:#181b1e;--surface-2:#1e2226;--line:#2a2f34;--line-2:#363c42;
  --text:#e9ebed;--text-2:#b9bec4;--muted:#8b9299;
  --accent:#7fb3aa;--accent-ink:#0f1413;--accent-dim:#2b3b38;
  --s1:#d9dde1;--s2:#8b9299;--s3:#5f676e;
  --radius:6px;--wrap:1120px;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:400 16px/1.6 var(--sans);font-feature-settings:"cv11","ss01";-webkit-font-smoothing:antialiased}
a{color:var(--text);text-decoration:underline;text-decoration-color:var(--line-2);text-underline-offset:3px}
a:hover{text-decoration-color:var(--accent)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1,h2,h3{font-weight:600;letter-spacing:-.015em;line-height:1.2;margin:0 0 .6em}
h1{font-size:clamp(2rem,4.4vw,3.1rem)}
h2{font-size:1.35rem}
.sx-h3,h3{font-size:1rem;margin-top:1.6em}
p{margin:0 0 1em}
code,.sx-mono{font-family:var(--mono);font-size:.92em;font-variant-numeric:tabular-nums}
.sx-muted{color:var(--muted)}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--accent-ink);padding:.5em 1em;z-index:10}
.skip:focus{left:1rem}
.sx-wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}

/* header / footer */
.sx-header{border-bottom:1px solid var(--line);background:var(--bg)}
.sx-header-in{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:60px;flex-wrap:wrap}
.sx-wordmark{font:600 .95rem/1 var(--mono);letter-spacing:.28em;text-decoration:none;color:var(--text)}
.sx-wordmark--sm{font-size:.8rem;margin-bottom:.6rem}
.sx-nav{display:flex;gap:1.3rem;flex-wrap:wrap}
.sx-nav a{text-decoration:none;color:var(--text-2);font-size:.92rem;padding:.3rem 0;border-bottom:1px solid transparent}
.sx-nav a:hover,.sx-nav a[aria-current=page]{color:var(--text);border-bottom-color:var(--accent)}
.sx-footer{border-top:1px solid var(--line);margin-top:5rem;padding:3rem 0 2rem;font-size:.9rem}
.sx-footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2rem}
.sx-footer ul{list-style:none;margin:0;padding:0}
.sx-footer li{margin:.3rem 0}
.sx-footer a{color:var(--text-2);text-decoration:none}
.sx-footer a:hover{color:var(--text)}
.sx-foot-h{font-size:.75rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin:0 0 .8rem;font-weight:600}
.sx-foot-note{margin-top:2rem;border-top:1px solid var(--line);padding-top:1.2rem;font-size:.82rem}

/* hero */
.sx-hero{padding:5rem 0 4rem;border-bottom:1px solid var(--line)}
.sx-hero-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:3.5rem;align-items:center}
.sx-eyebrow{font:500 .75rem/1 var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:1.4rem}
.sx-hero h1{max-width:14ch}
.sx-hero-sub{font-size:1.15rem;color:var(--text-2);max-width:40ch;margin-bottom:2rem}
.sx-ctas{display:flex;gap:.8rem;flex-wrap:wrap}
.sx-btn{display:inline-block;padding:.8rem 1.3rem;border:1px solid var(--line-2);border-radius:var(--radius);text-decoration:none;font-weight:500;color:var(--text);background:var(--surface)}
.sx-btn:hover{border-color:var(--muted)}
.sx-btn--primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.sx-btn--primary:hover{background:#94c3bb;border-color:#94c3bb}

/* diagrams */
.sx-diagram{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem}
.sx-diagram svg{display:block;width:100%;height:auto}
.sx-diagram figcaption{margin-top:1rem;font-size:.85rem}
.sx-diagram figcaption p{margin:.5rem 0 0;font-size:.8rem}
.sx-r{fill:none;stroke-width:.35;vector-effect:non-scaling-stroke;stroke-width:1.5px}
.sx-r.s0{stroke:var(--accent);fill:rgba(127,179,170,.08)}
.sx-r.s1{stroke:var(--s1);fill:rgba(217,221,225,.04)}
.sx-r.s2{stroke:var(--s2);stroke-dasharray:4 3}
.sx-r.s3{stroke:var(--s3)}
.sx-axis{stroke:var(--muted);stroke-width:1px;vector-effect:non-scaling-stroke}
.sx-scale line{stroke:var(--muted);stroke-width:1px;vector-effect:non-scaling-stroke}
.sx-scale text{fill:var(--muted);font:1.5px var(--mono)}
.sx-legend{list-style:none;margin:0;padding:0;display:grid;gap:.35rem}
.sx-legend li{display:flex;align-items:center;gap:.55rem;flex-wrap:wrap}
.sx-sw{width:14px;height:10px;border:1.5px solid;border-radius:2px;flex:none}
.sx-sw.s0{border-color:var(--accent);background:rgba(127,179,170,.15)}
.sx-sw.s1{border-color:var(--s1)}
.sx-sw.s2{border-color:var(--s2);border-style:dashed}
.sx-sw.s3{border-color:var(--s3)}
.sx-lineup{margin:2rem 0 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem}
.sx-lineup-scroll{overflow-x:auto}
.sx-lineup svg{display:block;width:100%;min-width:640px;height:auto}
.sx-lineup a:hover .sx-r{fill:rgba(127,179,170,.2)}
.sx-lbl{fill:var(--text-2);font:500 2.1px var(--sans)}
.sx-lbl--dim{fill:var(--muted);font:1.9px var(--mono)}
.sx-lineup figcaption{margin-top:.8rem;font-size:.82rem}

/* sections */
.sx-page{padding-top:1.6rem}
.sx-page-head{margin:1.2rem 0 2.2rem;max-width:760px}
.sx-lede{font-size:1.12rem;color:var(--text-2)}
.sx-lede-sm{color:var(--text-2);max-width:62ch}
.sx-sec{margin-top:3.6rem}
.sx-split{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.sx-split--top{margin-top:0}
.sx-more{display:inline-block;margin-top:1rem;color:var(--accent);text-decoration:none;font-weight:500;margin-right:1.4rem}
.sx-more:hover{text-decoration:underline}
.sx-crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem;font-size:.82rem;color:var(--muted)}
.sx-crumbs li+li::before{content:"/";margin-right:.4rem;color:var(--line-2)}
.sx-crumbs a{color:var(--muted);text-decoration:none}
.sx-crumbs a:hover{color:var(--text)}
.sx-list{margin:0;padding:0;list-style:none}
.sx-list li{padding:.45rem 0;border-bottom:1px solid var(--line)}
.sx-list--plain li{color:var(--text-2)}
.sx-callout{border-left:2px solid var(--accent);padding:.2rem 0 .2rem 1rem;margin-top:1.4rem;color:var(--text-2)}

/* cards */
.sx-cards{list-style:none;margin:1.6rem 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.sx-cards--2{grid-template-columns:repeat(2,1fr)}
.sx-card{display:flex;flex-direction:column;gap:.6rem;height:100%;padding:1.3rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);text-decoration:none}
.sx-card:hover{border-color:var(--line-2);background:var(--surface-2)}
.sx-card-h{font-weight:600;font-size:1.05rem}
.sx-card-p{color:var(--text-2);font-size:.93rem}
.sx-card-meta{color:var(--accent);font-size:.82rem;margin-top:auto}
.sx-card-alias{font-size:.8rem}
.sx-card-go{color:var(--accent);font-size:.88rem;margin-top:auto}

/* tables */
.sx-table-wrap{overflow-x:auto}
.sx-table,.sx-matrix{width:100%;border-collapse:collapse;font-size:.92rem;margin-top:.6rem}
.sx-table th,.sx-table td,.sx-matrix th,.sx-matrix td{text-align:left;padding:.62rem .8rem .62rem 0;border-bottom:1px solid var(--line);vertical-align:top}
.sx-table thead th,.sx-matrix thead th{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:600;border-bottom-color:var(--line-2)}
.sx-table tbody th{font-weight:500}
.sx-matrix td{text-align:right;padding-right:.6rem}
.sx-matrix thead th{text-align:right}
.sx-matrix thead th:first-child{text-align:left}
.sx-matrix td.sx-same{color:var(--muted)}
.sx-matrix--left td{text-align:right}
.sx-table--pair th[scope=row]{color:var(--text-2);font-weight:400}

/* spec */
.sx-spec{margin:0;display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.sx-spec div{background:var(--surface);padding:.9rem 1rem}
.sx-spec dt{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin-bottom:.25rem}
.sx-spec dd{margin:0;font-size:1.05rem;color:var(--text)}
.sx-spec div:last-child:nth-child(odd){grid-column:1/-1}
.sx-split--top section>p{margin-top:1.2rem;color:var(--text-2)}

/* formula */
.sx-formula{margin-top:1.4rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:1rem 1.1rem}
.sx-formula p{margin:.45rem 0;display:flex;flex-direction:column;gap:.15rem}
.sx-formula .sx-k{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}
.sx-formula code{color:var(--accent)}

/* tools */
.sx-tool{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);padding:1.6rem;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:2rem;align-items:center}
.sx-tool-inputs{display:grid;gap:1rem}
.sx-field{display:grid;gap:.4rem}
.sx-field span{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted)}
.sx-field input,.sx-field select{width:100%;font:500 1.05rem var(--sans);color:var(--text);background:var(--bg);border:1px solid var(--line-2);border-radius:var(--radius);padding:.75rem .85rem;min-height:48px}
.sx-field input{font-family:var(--mono)}
.sx-field select{appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%238b9299' stroke-width='1.6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .9rem center;padding-right:2.4rem}
.sx-result{border-left:1px solid var(--line-2);padding-left:2rem}
.sx-result-k{font-size:.75rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin:0 0 .2rem}
.sx-result-v{font:600 clamp(3rem,8vw,5rem)/1 var(--mono);letter-spacing:-.03em;color:var(--accent);margin:0 0 .6rem;font-variant-numeric:tabular-nums}
.sx-result-v span{font-size:.38em;color:var(--text-2);letter-spacing:0;margin-left:.1em}
.sx-result-v--sm{font-size:clamp(1.6rem,3.5vw,2.2rem);color:var(--text)}
.sx-result-note{color:var(--text-2);font-family:var(--mono);font-size:.85rem;margin:0}
.sx-result--fov{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem 1.6rem}
.sx-result--fov>div:first-child{grid-column:1/-1}
.sx-tool--compare{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr)}
.sx-compare-grid{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:1.6rem;align-items:start;border-top:1px solid var(--line);padding-top:1.6rem}
.sx-compare-grid .sx-diagram{background:var(--bg)}

/* shopping (secondary, but visible: sits under the equivalence table) */
.sx-shop{margin-top:2rem;border:1px solid var(--line);border-left:2px solid var(--accent);border-radius:var(--radius);background:var(--surface);padding:1.1rem 1.3rem}
.sx-shop-h{font-size:.75rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);font-weight:600;margin:0 0 .7rem}
.sx-shop-links{display:flex;flex-wrap:wrap;gap:.7rem;margin:0 0 .8rem}
.sx-aff{display:inline-flex;align-items:center;gap:.4rem;min-height:48px;padding:.8rem 1.3rem;border:1px solid var(--accent);border-radius:var(--radius);text-decoration:none;font-weight:600;font-size:1rem;color:var(--accent-ink);background:var(--accent)}
.sx-aff:hover{background:#94c3bb;border-color:#94c3bb}
.sx-aff:focus-visible{outline:2px solid var(--text);outline-offset:2px}
.sx-shop-note{font-size:.8rem;max-width:70ch;margin:0}
.sx-sources{margin-top:3rem;font-size:.85rem;color:var(--muted)}
.sx-sources ul{margin:0;padding-left:1.1rem}
.sx-sources a{color:var(--text-2)}
.sx-404{padding-top:5rem;min-height:50vh}

@media (max-width:900px){
  .sx-hero{padding:3rem 0}
  .sx-hero-grid,.sx-split,.sx-tool,.sx-tool--compare,.sx-compare-grid{grid-template-columns:1fr;gap:2rem}
  .sx-cards,.sx-cards--2{grid-template-columns:1fr}
  .sx-footer-grid{grid-template-columns:1fr 1fr}
  .sx-result{border-left:0;padding-left:0;border-top:1px solid var(--line-2);padding-top:1.4rem}
}
@media (max-width:560px){
  .sx-wrap{padding:0 16px}
  .sx-footer-grid{grid-template-columns:1fr}
  .sx-nav{gap:.9rem}
  .sx-spec{grid-template-columns:1fr}
  .sx-table--wide thead{display:none}
  .sx-table--wide tr{display:block;border-bottom:1px solid var(--line);padding:.6rem 0}
  .sx-table--wide th,.sx-table--wide td{display:flex;justify-content:space-between;border:0;padding:.2rem 0}
  .sx-table--wide td::before{content:attr(data-label);color:var(--muted);font-family:var(--sans);font-size:.82rem}
  .sx-tool{padding:1.1rem}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
.sx-matrix tbody th{min-width:9.5rem}.sx-matrix thead th{white-space:nowrap}
.sx-shop .disclosure-inline{font-size:.85rem;color:var(--text-2);margin:.2rem 0 .4rem}