/* Opus Works design system. One file, no framework.
   Dark shell, paper for long reading. Inter for text, IBM Plex Mono for labels. */
:root{
  --black:#0b0c0e;--panel:#131517;--panel-2:#191c1f;--hair:#26292d;--hair-2:#33373c;
  --text:#e8e8e4;--muted:#9a9fa6;--dim:#6b7178;
  --paper:#f4f4f0;--paper-2:#eaeae5;--ink:#111214;--ink-muted:#5d6268;--paper-hair:#d3d3cd;
  --signal:#7fb2d9;
  --sans:'Inter',ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --wrap:1440px;--gutter:clamp(20px,4vw,64px);
  --bg:var(--black);--fg:var(--text);--fg-muted:var(--muted);--line:var(--hair);--surface:var(--panel);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
body.paper{--bg:var(--paper);--fg:var(--ink);--fg-muted:var(--ink-muted);--line:var(--paper-hair);--surface:var(--paper-2)}
a{color:inherit;text-decoration:none}
p a,li a,.post-body a,.inline{text-decoration:underline;text-underline-offset:.2em;text-decoration-color:var(--fg-muted)}
p a:hover,li a:hover,.inline:hover{text-decoration-color:currentColor}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{max-width:100%;height:auto;display:block}
button,input{font:inherit;color:inherit}
.skip{position:fixed;left:16px;top:-80px;z-index:100;background:var(--text);color:var(--black);padding:10px 14px}
.skip:focus{top:12px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}

/* Type */
.label{font-family:var(--mono);font-size:.75rem;letter-spacing:.04em;text-transform:uppercase;color:var(--fg-muted);font-weight:400}
.display{font-weight:400;font-size:clamp(2.5rem,6.2vw,5.5rem);line-height:.98;letter-spacing:-.045em;text-wrap:balance;max-width:16ch}
.h2{font-weight:400;font-size:clamp(1.75rem,3.2vw,2.75rem);line-height:1.08;letter-spacing:-.035em;text-wrap:balance}
.h3{font-weight:500;font-size:1.25rem;line-height:1.3;letter-spacing:-.02em}
.lede{font-size:clamp(1.125rem,1.6vw,1.375rem);line-height:1.5;color:var(--fg-muted);max-width:60ch;text-wrap:pretty}
.byline{margin-top:12px;color:var(--fg-muted);font-size:.9375rem}
.small{font-size:.9375rem;color:var(--fg-muted)}
.mono{font-family:var(--mono)}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums}
p+p{margin-top:1em}

/* Header */
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:32px;height:72px}
.wordmark{font-weight:500;font-size:1.125rem;letter-spacing:-.03em;white-space:nowrap}
.nav{display:flex;gap:28px;font-size:.9375rem;color:var(--fg-muted)}
.nav a:hover,.nav a[aria-current]{color:var(--fg)}
.nav-contact{margin-left:12px;padding-left:28px;border-left:1px solid var(--line);color:var(--fg)}
.menu-toggle{display:none;background:none;border:1px solid var(--line);padding:8px 14px;font-family:var(--mono);font-size:.75rem;letter-spacing:.04em;text-transform:uppercase;cursor:pointer}

/* Sections */
.section{padding:clamp(64px,9vw,128px) 0;border-top:1px solid var(--line)}
.section.tight{padding:clamp(40px,6vw,80px) 0}
.page-head{padding:clamp(64px,10vw,140px) 0 clamp(40px,6vw,80px)}
.page-head .label{margin-bottom:28px}
.page-head .lede{margin-top:28px}
.product-name{margin-top:36px;font-family:var(--mono);font-size:.8125rem;letter-spacing:.04em;text-transform:uppercase;color:var(--signal)}
.grid-2{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(32px,5vw,96px);align-items:start}
.grid-2 .h2{max-width:14ch}
/* When the left column starts with an index label, drop the right column so
   it lines up with the heading, not the label. */
.grid-2 > :first-child > .label{margin-bottom:20px}
.grid-2:has(> :first-child > .label:first-child) > :last-child{padding-top:calc(.75rem * 1.6 + 20px)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(24px,3vw,48px)}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(24px,3vw,48px)}
.stack>*+*{margin-top:1em}
.section-head{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(32px,5vw,96px);margin-bottom:clamp(40px,5vw,72px)}
.section-head .label{margin-bottom:20px}
.section-head p:not(.label){color:var(--fg-muted);max-width:56ch;align-self:end}

/* Rows: the hairline list that carries most content */
.rows{border-top:1px solid var(--line)}
.row{display:grid;grid-template-columns:5rem minmax(0,4fr) minmax(0,7fr) auto;gap:clamp(16px,3vw,48px);padding:28px 0;border-bottom:1px solid var(--line);align-items:baseline}
.row .label{padding-top:.35em}
.row h3{font-weight:500;font-size:1.25rem;letter-spacing:-.02em}
.row p{color:var(--fg-muted)}
.row .go{font-family:var(--mono);font-size:.75rem;letter-spacing:.04em;text-transform:uppercase;white-space:nowrap;color:var(--fg)}
a.row:hover{background:linear-gradient(90deg,transparent,color-mix(in srgb,var(--surface) 60%,transparent) 12%,color-mix(in srgb,var(--surface) 60%,transparent) 88%,transparent)}
.row.two{grid-template-columns:5rem minmax(0,1fr)}
.row.three{grid-template-columns:5rem minmax(0,4fr) minmax(0,7fr)}
.kv{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:16px 32px;padding:18px 0;border-bottom:1px solid var(--line)}
.kv:first-child{border-top:1px solid var(--line)}
.kv dt{color:var(--fg-muted)}
.kv dd{margin:0}

/* Tables */
.table{width:100%;border-collapse:collapse;font-size:.9375rem}
.table th,.table td{text-align:left;padding:14px 16px 14px 0;border-bottom:1px solid var(--line);vertical-align:top}
.table th{font-family:var(--mono);font-weight:400;font-size:.75rem;letter-spacing:.04em;text-transform:uppercase;color:var(--fg-muted)}
.table td.num,.table th.num{text-align:right;padding-right:0}

/* Buttons */
.btn{display:inline-block;padding:14px 22px;border:1px solid var(--fg);color:var(--bg);background:var(--fg);font-size:.9375rem;font-weight:500;line-height:1.2}
.btn:hover{background:transparent;color:var(--fg)}
.btn.ghost{background:transparent;color:var(--fg);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--fg)}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}

/* Panels and diagrams */
.panel{background:var(--surface);border:1px solid var(--line);padding:clamp(20px,3vw,40px)}
.diagram{color:var(--fg);width:100%}
.diagram text{font-family:var(--mono);font-size:11px;fill:currentColor;letter-spacing:.02em}
.diagram .muted{color:var(--fg-muted)}
.diagram .signal{color:var(--signal)}
.diagram .hair{stroke:var(--line)}
.diagram .fill{fill:var(--surface)}
.diagram-caption{margin-top:14px;font-family:var(--mono);font-size:.75rem;letter-spacing:.04em;text-transform:uppercase;color:var(--fg-muted)}
figure.dg{margin:0}

/* Hero */
.hero{padding:clamp(56px,9vw,120px) 0 clamp(48px,7vw,96px)}
.hero-grid{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,6fr);gap:clamp(32px,5vw,96px);align-items:center}
.hero .lede{margin-top:32px}
.hero .meta{display:flex;flex-wrap:wrap;gap:12px 32px;margin-top:40px}
.hero-diagram{border:1px solid var(--line);background:var(--surface);padding:clamp(16px,2.5vw,36px)}
@media(prefers-reduced-motion:no-preference){
  .draw path,.draw circle,.draw line,.draw rect{stroke-dasharray:1200;stroke-dashoffset:1200;animation:draw 1.6s cubic-bezier(.2,.7,.2,1) forwards}
  .draw text{opacity:0;animation:fade .6s ease 1s forwards}
  @keyframes draw{to{stroke-dashoffset:0}}
  @keyframes fade{to{opacity:1}}
}

/* Pricing */
.price{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 20px}
.price .amt{font-family:var(--mono);font-size:clamp(2.5rem,5vw,4rem);letter-spacing:-.04em;line-height:1}
.price .for{color:var(--fg-muted)}
.fine{font-size:.875rem;color:var(--fg-muted);margin-top:12px}

/* Calculator */
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(24px,4vw,64px)}
.field{display:block;padding:18px 0;border-bottom:1px solid var(--line)}
.field span{display:block}
.field .hint{font-size:.875rem;color:var(--fg-muted);margin-top:2px}
.field input{width:100%;margin-top:10px;background:transparent;border:0;border-bottom:1px solid var(--fg-muted);padding:8px 0;font-family:var(--mono);font-size:1.5rem;color:var(--fg)}
.field input:focus{outline:none;border-bottom-color:var(--fg)}
.calc-out .amt{font-family:var(--mono);font-size:clamp(2.5rem,5vw,4rem);letter-spacing:-.04em;line-height:1;margin:8px 0 12px}

/* Footer */
.site-footer{border-top:1px solid var(--line);padding:clamp(48px,7vw,96px) 0 40px;font-size:.9375rem;color:var(--fg-muted)}
.footer-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px}
.footer-grid.three{grid-template-columns:minmax(0,1fr) minmax(0,1fr) minmax(0,1.4fr)}
.footer-grid a,.footer-grid p{display:block;margin-top:10px}
.footer-grid a:hover{color:var(--fg)}
.footer-grid .label{margin-top:0;margin-bottom:6px}
.footer-line{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:64px;padding-top:24px;border-top:1px solid var(--line)}

/* Journal */
.post .page-head{padding-bottom:0}
.post-body{max-width:68ch;margin:clamp(40px,6vw,72px) 0 0;font-size:1.125rem;line-height:1.65}
.post-body h2{font-weight:500;font-size:1.5rem;letter-spacing:-.025em;margin:2.2em 0 .6em}
.post-body h3{font-weight:500;font-size:1.125rem;margin:1.8em 0 .5em}
.post-body p+p,.post-body ul,.post-body ol{margin-top:1em}
.post-body ul{list-style:disc;padding-left:1.2em}
.post-body ol{list-style:decimal;padding-left:1.2em}
.post-body li+li{margin-top:.4em}
.post-body figure{margin:2em 0}
.post-body figure.wide{max-width:none}
.post-body blockquote{margin:1.6em 0;padding-left:1.2em;border-left:2px solid var(--line);color:var(--fg-muted)}
.post-body code{font-family:var(--mono);font-size:.9em;background:var(--surface);padding:.1em .35em}
.post-body pre{background:var(--surface);border:1px solid var(--line);padding:16px 20px;overflow-x:auto;font-size:.875rem;line-height:1.5;margin:1.4em 0}
.post-body pre code{background:none;padding:0}
.post-body table{width:100%;border-collapse:collapse;font-size:.9375rem;margin:1.4em 0}
.post-body th,.post-body td{text-align:left;padding:10px 12px 10px 0;border-bottom:1px solid var(--line);vertical-align:top}
.post-body th{font-family:var(--mono);font-weight:400;font-size:.75rem;letter-spacing:.04em;text-transform:uppercase;color:var(--fg-muted)}
.post-end{display:flex;gap:32px;margin:clamp(48px,7vw,96px) 0;padding-top:24px;border-top:1px solid var(--line)}
.post-list .row{grid-template-columns:8rem minmax(0,1fr) auto}

/* Utilities */
.max-60{max-width:60ch}
.max-70{max-width:70ch}
.mt-1{margin-top:1rem}.mt-2{margin-top:2rem}.mt-3{margin-top:3rem}.mt-4{margin-top:4rem}
.muted{color:var(--fg-muted)}
.signal{color:var(--signal)}
.hair-top{border-top:1px solid var(--line);padding-top:20px}

/* Responsive */
@media(max-width:1000px){
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid,.footer-grid.three{grid-template-columns:repeat(2,minmax(0,1fr))}
  .row{grid-template-columns:4rem minmax(0,1fr);row-gap:8px}
  .row .go{grid-column:2}
  .row.three{grid-template-columns:4rem minmax(0,1fr)}
  .hero-grid{grid-template-columns:1fr}
}
@media(max-width:760px){
  .bar{height:64px}
  .nav{position:fixed;inset:64px 0 auto 0;flex-direction:column;gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:8px var(--gutter) 20px;display:none}
  .nav.is-open{display:flex}
  .nav a{padding:14px 0;border-top:1px solid var(--line);font-size:1.0625rem}
  .nav-contact{margin:0;padding-left:0;border-left:0}
  .menu-toggle{display:inline-block}
  .grid-2,.section-head,.grid-3,.calc{grid-template-columns:1fr}
  .grid-2:has(> :first-child > .label:first-child) > :last-child{padding-top:0}
  .grid-4,.footer-grid,.footer-grid.three{grid-template-columns:1fr}
  .row{grid-template-columns:1fr;gap:6px}
  .row .label{padding-top:0}
  .row .go{grid-column:1}
  .row.two,.row.three{grid-template-columns:1fr}
  .kv{grid-template-columns:1fr;gap:4px}
  .display{max-width:none}
  .post-list .row{grid-template-columns:1fr}
}
@media print{.site-header,.menu-toggle,.cta{display:none}body{background:#fff;color:#000}}