/* Layout concept: a bound book — running heads, wide photographic plates, a 64ch reading column with key facts in the margin, mono "logbook" lines (a nod to the hydrographer's survey log). */

@font-face{font-family:"Instrument Serif";src:url(fonts/instrument-serif-latin-400-normal.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Instrument Serif";src:url(fonts/instrument-serif-latin-400-italic.woff2) format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Literata";src:url(fonts/literata-latin-wght-normal.woff2) format("woff2");font-weight:200 900;font-style:normal;font-display:swap}
@font-face{font-family:"Literata";src:url(fonts/literata-latin-wght-italic.woff2) format("woff2");font-weight:200 900;font-style:italic;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}

:root{
  --paper:#F4F6F9; --surface:#FFFFFF; --ink:#0F1C2E; --muted:#556275; --rule:#D8DEE7;
  --navy:#173A66; --brass:#9C7629; --brass-soft:#EFE6D2; --on-navy:#F4F6F9; --todo:#FFE58A;
  --f-display:"Instrument Serif", "Iowan Old Style", Georgia, serif;
  --f-body:"Literata", "Iowan Old Style", Georgia, serif;
  --f-mono:"IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --s-1:.8125rem; --s0:1.0625rem; --s1:1.25rem; --s2:1.625rem; --s3:2.25rem; --s4:clamp(2.5rem,5.5vw,4.25rem);
  --gut:clamp(16px,4vw,40px); --max:1180px;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#0B1320; --surface:#111C2D; --ink:#E7ECF3; --muted:#9BA8BA; --rule:#24334A;
  --navy:#8DB4E6; --brass:#D6B266; --brass-soft:#2A2516; --on-navy:#0B1320; --todo:#6B5A12; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0B1320; --surface:#111C2D; --ink:#E7ECF3; --muted:#9BA8BA; --rule:#24334A;
  --navy:#8DB4E6; --brass:#D6B266; --brass-soft:#2A2516; --on-navy:#0B1320; --todo:#6B5A12; color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:var(--s0);line-height:1.65;font-optical-sizing:auto}
img,video{max-width:100%;height:auto;display:block}
a{color:inherit}
a:focus-visible,summary:focus-visible{outline:2px solid var(--brass);outline-offset:3px;border-radius:2px}
h1,h2,h3{font-family:var(--f-display);font-weight:400;line-height:1.08;text-wrap:balance;margin:0;letter-spacing:-.01em}
h1{font-size:var(--s4)} h2{font-size:var(--s3)} h3{font-size:var(--s1);font-family:var(--f-body);font-weight:600;letter-spacing:0;line-height:1.3}
p{margin:0}
.wrap{max-width:var(--max);margin-inline:auto;padding-inline:var(--gut)}
.narrow{max-width:820px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);padding:.5rem 1rem;z-index:10}
.skip:focus{left:8px}
.label,.kicker,.running,.status,.logline dt,.stat-label,.brand-role,.toc-tags{font-family:var(--f-mono);font-size:var(--s-1);letter-spacing:.06em;text-transform:uppercase}
.label{color:var(--brass)}
.kicker{color:var(--brass);margin-bottom:1rem}
.lead{font-size:var(--s1);color:var(--muted);max-width:60ch;line-height:1.55}
.btn{display:inline-flex;align-items:center;gap:.5rem;background:var(--navy);color:var(--on-navy);text-decoration:none;font-family:var(--f-mono);font-size:.875rem;font-weight:500;letter-spacing:.02em;padding:.85rem 1.25rem;border-radius:2px;border:1px solid var(--navy);transition:background .2s,color .2s}
.btn:hover{background:transparent;color:var(--navy)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--rule)}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink)}
.btn-small{padding:.5rem .8rem;font-size:.8125rem}

/* masthead */
.masthead{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--rule)}
.mast-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding-block:.75rem}
.brand{text-decoration:none;display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-family:var(--f-display);font-size:1.5rem}
.brand-role{color:var(--muted);font-size:.6875rem}
.masthead nav{display:flex;align-items:center;gap:1.1rem;flex-wrap:wrap;font-family:var(--f-mono);font-size:.8125rem}
.masthead nav a:not(.btn){text-decoration:none;color:var(--muted)}
.masthead nav a:not(.btn):hover{color:var(--ink)}
.masthead nav .lang{border:1px solid var(--rule);padding:.2rem .5rem;border-radius:2px}
@media (max-width:720px){.masthead nav a[href$="#faq"],.masthead nav a[href$="#products"]{display:none}}
@media (max-width:420px){.masthead nav a[href$="#story"]{display:none}}

/* hero */
.hero{padding-block:clamp(2.5rem,6vw,5rem) 0}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(1.5rem,4vw,3.5rem);align-items:center}
.hero-copy{min-width:0;display:grid;gap:1.25rem}
.hero-copy .kicker{margin:0}
.hero-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:.5rem}
.hero-portrait{margin:0}
.hero-portrait img{width:100%;aspect-ratio:4/3.4;object-fit:cover;object-position:35% 50%;border-radius:2px}
.hero-portrait figcaption,.office figcaption,.inline-photo figcaption,.video figcaption{font-family:var(--f-mono);font-size:.75rem;color:var(--muted);margin-top:.5rem}
.stats{display:grid;grid-template-columns:repeat(4,1fr);margin-top:clamp(2rem,5vw,4rem);border-top:1px solid var(--ink);border-bottom:1px solid var(--rule)}
.stat{padding:1.25rem 1rem 1.25rem 0;display:flex;flex-direction:column;gap:.25rem;min-width:0}
.stat+.stat{padding-left:1.25rem;border-left:1px solid var(--rule)}
.stat-num{font-family:var(--f-display);font-size:clamp(2.25rem,4.5vw,3.5rem);line-height:1;font-variant-numeric:tabular-nums}
.stat-label{color:var(--muted);font-size:.6875rem;line-height:1.4}
@media (max-width:820px){.hero-grid{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}.stat:nth-child(3){padding-left:0;border-left:0}.stat:nth-child(n+3){border-top:1px solid var(--rule)}}

/* sections */
section{scroll-margin-top:80px}
.sec-head{display:grid;gap:.6rem;margin-bottom:2rem;max-width:60ch}
.sec-intro{color:var(--muted)}
.book,.products,.proof,.faq{padding-block:clamp(3rem,7vw,5.5rem)}

/* table of contents */
.toc{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.toc-row{border-bottom:1px solid var(--rule)}
.toc-row a{display:grid;grid-template-columns:4.5rem minmax(0,1fr) 200px;gap:1.5rem;align-items:center;padding-block:1.25rem;text-decoration:none}
.toc-num{font-family:var(--f-display);font-size:3rem;line-height:1;color:var(--brass);font-variant-numeric:tabular-nums}
.toc-body{display:grid;gap:.3rem;min-width:0}
.toc-title{font-family:var(--f-display);font-size:var(--s2);line-height:1.1}
.toc-short{color:var(--muted);max-width:62ch}
.toc-tags{color:var(--muted);font-size:.6875rem}
.toc-thumb{width:200px;aspect-ratio:2/1;object-fit:cover;border-radius:2px;filter:saturate(.9)}
.toc-row a:hover .toc-title{text-decoration:underline;text-decoration-color:var(--brass);text-underline-offset:5px;text-decoration-thickness:1px}
@media (max-width:720px){.toc-row a{grid-template-columns:3rem minmax(0,1fr)}.toc-thumb{display:none}.toc-num{font-size:2.25rem}}

/* products */
.products{background:var(--surface);border-block:1px solid var(--rule)}
.pgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(1rem,3vw,2rem)}
.pcard a{display:grid;gap:.75rem;text-decoration:none}
.pcard img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:2px}
.pcard h3{font-family:var(--f-display);font-weight:400;font-size:var(--s2)}
.pcard p{color:var(--muted)}
.pcard a:hover h3{color:var(--navy)}
.status{justify-self:start;display:inline-block;font-size:.6875rem;padding:.2rem .5rem;border-radius:2px;border:1px solid currentColor}
.status-live{color:var(--navy)}
.status-dev{color:var(--brass)}
@media (max-width:860px){.pgrid{grid-template-columns:1fr}}

/* proof */
.proof-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:clamp(1.5rem,4vw,3.5rem);align-items:center}
.proof-copy{display:grid;gap:1rem}
.proof-copy p{color:var(--muted);max-width:56ch}
.seals{list-style:none;padding:0;margin:.5rem 0 0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.75rem}
.seals li{background:#FFFFFF;border:1px solid var(--rule);border-radius:2px;padding:.5rem;display:grid;place-items:center;aspect-ratio:1}
.seals img{max-height:100%;object-fit:contain}
.office{margin:0}
.office img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:2px}
@media (max-width:820px){.proof-grid{grid-template-columns:1fr}}

/* faq */
.faq h2{margin-bottom:1.5rem}
details{border-top:1px solid var(--rule)}
details:last-of-type{border-bottom:1px solid var(--rule)}
summary{cursor:pointer;list-style:none;padding:1.1rem 2rem 1.1rem 0;font-weight:600;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:0;top:.9rem;font-family:var(--f-mono);font-size:1.25rem;color:var(--brass)}
details[open] summary::after{content:"–"}
details p{padding-bottom:1.25rem;color:var(--muted);max-width:68ch}

/* cta */
.cta-band{background:var(--navy);color:var(--on-navy);padding-block:clamp(2.5rem,6vw,4.5rem)}
.cta-inner{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:2rem;align-items:end}
.cta-copy{display:grid;gap:.75rem}
.cta-copy p{opacity:.85;max-width:56ch}
.cta-actions{display:grid;gap:1rem;justify-items:start}
.cta-band .btn{background:var(--on-navy);color:var(--navy);border-color:var(--on-navy)}
.cta-band .btn:hover{background:transparent;color:var(--on-navy)}
.contact-lines{display:grid;gap:.2rem;font-family:var(--f-mono);font-size:.8125rem;opacity:.9}
.sel{user-select:all}
@media (max-width:760px){.cta-inner{grid-template-columns:1fr}}

/* footer */
.site-foot{padding-block:3rem;border-top:1px solid var(--rule);font-size:.9375rem}
.foot-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:2rem}
.foot-grid ul{list-style:none;padding:0;margin:.6rem 0 0;display:grid;gap:.3rem}
.foot-grid a{text-decoration:none;color:var(--muted)}
.foot-grid a:hover{color:var(--ink)}
.foot-name{font-family:var(--f-display);font-size:1.5rem}
.foot-note{color:var(--muted);font-size:.875rem}
.foot-legal{margin-top:1.25rem}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr}}

/* chapter */
.chap-head{padding-block:clamp(2rem,5vw,3.5rem) 1.5rem;display:grid;gap:1rem;position:relative}
.running{color:var(--muted)}
.running a{text-decoration:none;color:var(--brass)}
.chap-num{font-family:var(--f-display);font-style:italic;font-size:clamp(5rem,14vw,10rem);line-height:.8;color:var(--brass);margin-top:.5rem}
.chap-head h1{max-width:18ch}
.logline{display:flex;flex-wrap:wrap;gap:0;margin:.5rem 0 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--rule)}
.logline div{padding:.7rem 1.25rem .7rem 0;margin-right:1.25rem;border-right:1px solid var(--rule)}
.logline div:last-child{border-right:0}
.logline dt{color:var(--muted);font-size:.625rem}
.logline dd{margin:0;font-family:var(--f-mono);font-size:.875rem}
.plate{margin-block:1.5rem 0}
.plate img{width:100%;aspect-ratio:1512/763;object-fit:cover;border-radius:2px}
.chap-grid{display:grid;grid-template-columns:240px minmax(0,64ch);gap:clamp(1.5rem,5vw,4.5rem);padding-block:clamp(2rem,5vw,3.5rem);justify-content:center}
.facts{position:sticky;top:96px;align-self:start;border-top:1px solid var(--ink);padding-top:.75rem}
.facts ul{list-style:none;padding:0;margin:.75rem 0 0;display:grid;gap:.75rem;font-size:.9375rem;color:var(--muted);line-height:1.45}
.facts li{padding-left:1rem;position:relative}
.facts li::before{content:"";position:absolute;left:0;top:.6em;width:.4rem;height:1px;background:var(--brass)}
.prose{display:grid;gap:1.25rem;min-width:0}
.prose p:first-child::first-letter{font-family:var(--f-display);float:left;font-size:4.2em;line-height:.85;padding:.06em .1em 0 0;color:var(--navy)}
.prose strong{font-weight:600;background:linear-gradient(transparent 62%,var(--brass-soft) 62%)}
.lesson{margin:1rem 0 0;padding:1.5rem 0 0;border-top:1px solid var(--ink);display:grid;gap:.5rem}
.lesson p:last-child{font-family:var(--f-display);font-size:var(--s2);line-height:1.2}
.lesson p:first-child::first-letter{all:unset}
.inline-photo{margin:1rem 0 0;max-width:420px}
.inline-photo img{border-radius:2px}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:1rem;padding-bottom:clamp(2rem,5vw,3.5rem);border-top:1px solid var(--rule);padding-top:1.5rem}
.pager a{text-decoration:none;display:grid;gap:.3rem;font-family:var(--f-display);font-size:var(--s1)}
.pager a .label{font-family:var(--f-mono)}
.pager .next{text-align:right;justify-items:end}
.pager a:hover span:last-child{text-decoration:underline;text-decoration-color:var(--brass);text-underline-offset:4px}
@media (max-width:860px){.chap-grid{grid-template-columns:minmax(0,1fr)}.facts{position:static}}
@media (max-width:520px){.pager{grid-template-columns:1fr}.pager .next{text-align:left;justify-items:start}}

/* product */
.prod-hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:clamp(1.5rem,4vw,3.5rem);align-items:center;padding-block:clamp(2rem,5vw,4rem)}
.prod-copy{display:grid;gap:1rem;min-width:0}
.prod-img{margin:0}
.prod-img img{width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:2px}
.problem{padding-block:2rem;border-top:1px solid var(--ink);display:grid;grid-template-columns:200px minmax(0,1fr);gap:1.5rem}
.problem-text{font-family:var(--f-display);font-size:var(--s2);line-height:1.25;max-width:32ch}
.features{padding-block:2rem 3rem}
.features h2{margin-bottom:1.5rem}
.fgrid{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--rule)}
.fgrid li{padding:1.25rem 1.25rem 1.5rem 0;border-bottom:1px solid var(--rule);display:grid;gap:.4rem;align-content:start}
.fgrid li:not(:nth-child(3n+1)){padding-left:1.25rem;border-left:1px solid var(--rule)}
.fgrid p{color:var(--muted);font-size:.9375rem}
.video{padding-block:1rem 3rem}
.video figure{margin:0}
.video video{width:100%;border-radius:2px;background:#000}
.proofline{padding-block:2rem;border-top:1px solid var(--rule);display:grid;gap:1rem}
.proofline>p:first-child{max-width:70ch}
.story-links{display:flex;flex-wrap:wrap;gap:1.5rem;font-family:var(--f-mono);font-size:.875rem}
.story-links a{color:var(--navy)}
@media (max-width:860px){.prod-hero{grid-template-columns:1fr}.problem{grid-template-columns:1fr;gap:.5rem}.fgrid{grid-template-columns:1fr}.fgrid li:not(:nth-child(3n+1)){padding-left:0;border-left:0}}
@media (min-width:861px) and (max-width:1060px){.fgrid{grid-template-columns:repeat(2,minmax(0,1fr))}.fgrid li:not(:nth-child(3n+1)){padding-left:0;border-left:0}.fgrid li:nth-child(2n){padding-left:1.25rem;border-left:1px solid var(--rule)}}

/* legal */
.legal{padding-block:3rem;display:grid;gap:1rem}
.legal h1{font-size:var(--s3);margin-bottom:1rem}
mark.todo{background:var(--todo);color:var(--ink);padding:0 .25rem}

/* online presence */
.online{padding-block:clamp(3rem,7vw,5.5rem);border-top:1px solid var(--rule)}
.online-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(1rem,3vw,2rem);border-top:1px solid var(--ink);padding-top:1.25rem}
.netlist{list-style:none;padding:0;margin:.75rem 0 0;display:grid;gap:.6rem}
.netlist li{display:grid;gap:.05rem;min-width:0}
.netlist .net{font-family:var(--f-mono);font-size:.6875rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.netlist a{color:var(--navy);text-decoration:none;overflow-wrap:anywhere}
.netlist a:hover{text-decoration:underline;text-underline-offset:3px}
.foot-grid .foot-social{list-style:none;padding:0;margin:1rem 0 0;display:flex;flex-wrap:wrap;gap:.4rem 1rem;font-family:var(--f-mono);font-size:.75rem}
@media (max-width:900px){.online-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:480px){.online-grid{grid-template-columns:1fr}}
@media (max-width:900px){.masthead nav .nav-li{display:none}}

/* social icons */
.ico{width:20px;height:20px;flex:none;display:block}
.netlist .soc a{display:flex;align-items:center;gap:.75rem;text-decoration:none}
.netlist .soc a>span{display:grid;gap:.05rem;min-width:0}
.netlist .soc .ico{width:34px;height:34px;padding:7px;border:1px solid var(--rule);border-radius:50%;color:var(--navy);transition:color .2s,border-color .2s,background .2s}
.netlist .soc a:hover .ico{background:var(--navy);color:var(--on-navy);border-color:var(--navy)}
.netlist .soc .handle{color:var(--navy)}
.netlist .soc a:hover .handle{text-decoration:underline;text-underline-offset:3px}
.foot-grid .foot-social{gap:.5rem}
.foot-social a{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--rule);border-radius:50%;color:var(--ink)}
.foot-social a:hover{background:var(--navy);border-color:var(--navy);color:var(--on-navy)}
.foot-social .ico{width:17px;height:17px}
.foot-sites{margin-top:.75rem;font-family:var(--f-mono);font-size:.75rem;color:var(--muted)}
.foot-sites a{color:var(--muted)}
.masthead nav .nav-li{display:grid;place-items:center;color:var(--muted)}
.masthead nav .nav-li:hover{color:var(--navy)}

.prose a{color:var(--navy);text-decoration:underline;text-decoration-color:var(--brass);text-decoration-thickness:1px;text-underline-offset:3px}
.prose a:hover{text-decoration-thickness:2px}
.seals a{display:grid;place-items:center;width:100%;height:100%}

picture{display:contents}