/* FastRuleTech — site styles
   Concept: field-tech precision. Slate ink, copper accent (the copper lines being retired),
   condensed display type for headings, plain humanist body. */
:root{
  --ink:#16202a;        /* headings, dark bands */
  --fg:#26313b;         /* body text */
  --muted:#5b6873;
  --bg:#f6f7f5;
  --surface:#ffffff;
  --line:#dde1dc;
  --copper:#b4561f;
  --copper-ink:#8f4113;
  --copper-soft:#f5e5d8;
  --band:#16202a;       /* dark section background */
  --band-fg:#e9ecea;
  --band-muted:#a9b4bb;
  --ok:#2f7a4d;

  --display:"Archivo","Arial Narrow",system-ui,sans-serif;
  --body:"Instrument Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Consolas,monospace;

  --wrap:1160px;
  --r:10px;
  --shadow:0 1px 2px rgba(22,32,42,.06),0 8px 24px rgba(22,32,42,.06);
}
@media (prefers-color-scheme: dark){
  :root{
    --ink:#eef1ef; --fg:#d9dfdc; --muted:#9ba7ae; --bg:#121820; --surface:#19212a; --line:#2a3540;
    --copper:#e08a4f; --copper-ink:#f0a673; --copper-soft:#33231a;
    --band:#0c1117; --band-fg:#e9ecea; --band-muted:#9ba7ae;
    --ok:#6cc58f;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.25);
    color-scheme:dark;
  }
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 var(--body)}
img,svg{max-width:100%;height:auto}
a{color:var(--copper-ink);text-underline-offset:3px}
a:hover{color:var(--copper)}
:focus-visible{outline:2px solid var(--copper);outline-offset:3px;border-radius:4px}
h1,h2,h3{font-family:var(--display);color:var(--ink);line-height:1.08;text-wrap:balance;margin:0 0 .5em}
h1{font-size:clamp(2.4rem,5.4vw,4rem);font-weight:800;font-stretch:85%;letter-spacing:-.01em}
h2{font-size:clamp(1.8rem,3.4vw,2.6rem);font-weight:750;font-stretch:88%}
h3{font-size:1.25rem;font-weight:700}
p{margin:0 0 1em;max-width:68ch}
.wrap{max-width:var(--wrap);margin:0 auto;padding-inline:20px}
.eyebrow{font:600 .78rem var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--copper-ink);margin-bottom:12px;display:block}
.lede{font-size:1.18rem;color:var(--muted);max-width:60ch}
.skip{position:absolute;left:-999px;top:8px;background:var(--surface);padding:8px 12px;z-index:100}
.skip:focus{left:8px}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font:600 1rem var(--body);padding:13px 22px;border-radius:8px;text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.btn-primary{background:var(--copper);color:#fff}
.btn-primary:hover{background:var(--copper-ink);color:#fff}
@media (prefers-color-scheme: dark){.btn-primary,.btn-primary:hover{color:#1a0f07}}
.btn-ghost{border-color:var(--line);color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--copper);color:var(--ink)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:68px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font:800 1.3rem var(--display);font-stretch:85%;letter-spacing:.01em}
.logo svg{width:30px;height:30px;flex:none}
.logo span b{color:var(--copper)}
.nav-links{display:flex;align-items:center;gap:6px;list-style:none;margin:0;padding:0}
.nav-links a{color:var(--fg);text-decoration:none;font-weight:500;font-size:.96rem;padding:8px 12px;border-radius:6px}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--ink);background:var(--surface)}
.nav-links a[aria-current="page"]{box-shadow:inset 0 -2px 0 var(--copper)}
.nav-cta{margin-left:8px}
.nav-cta a{background:var(--copper);color:#fff!important;padding:9px 16px}
.nav-cta a:hover{background:var(--copper-ink)!important}
@media (prefers-color-scheme: dark){.nav-cta a{color:#1a0f07!important}}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:6px;padding:8px 10px;color:var(--ink);font:600 .9rem var(--body);cursor:pointer}
@media (max-width:880px){
  .menu-btn{display:inline-block}
  .nav-links{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;background:var(--bg);border-bottom:1px solid var(--line);padding:8px 20px 16px}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px}
  .nav-cta{margin:8px 0 0}
  .nav-cta a{text-align:center;display:block}
}

/* Hero */
.hero{padding-block:72px 64px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:48px;align-items:center}
@media (max-width:880px){.hero-grid{grid-template-columns:minmax(0,1fr)}.hero{padding-block:44px}}
.hero h1 .cu{color:var(--copper)}
.hero-note{margin-top:18px;font-size:.92rem;color:var(--muted)}
.hero-note strong{color:var(--ink)}
.line-diagram{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow)}
.line-diagram figcaption{font:500 .82rem var(--mono);color:var(--muted);margin-top:12px}
.line-diagram svg text{font-family:var(--body)}

/* Sections */
section{padding-block:80px}
.section-head{max-width:720px;margin-bottom:40px}
.alt{background:var(--surface);border-block:1px solid var(--line)}
.band{background:var(--band);color:var(--band-fg)}
.band h2,.band h3{color:#fff}
.band p,.band li{color:var(--band-muted)}
.band .eyebrow{color:#e9a070}

/* Fact strip */
.facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;border:1px solid rgba(255,255,255,.12);border-radius:var(--r);overflow:hidden}
.fact{padding:26px 24px;border-left:1px solid rgba(255,255,255,.12)}
.fact:first-child{border-left:0}
.fact b{display:block;font:800 1.6rem/1.1 var(--display);font-stretch:88%;color:#fff;margin-bottom:6px}
.fact p{margin:0;font-size:.95rem}
@media (max-width:760px){.facts{grid-template-columns:minmax(0,1fr)}.fact{border-left:0;border-top:1px solid rgba(255,255,255,.12)}.fact:first-child{border-top:0}}

/* Cards */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:980px){.g4{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.g2,.g3,.g4{grid-template-columns:minmax(0,1fr)}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:26px;display:flex;flex-direction:column;min-width:0}
.alt .card{background:var(--bg)}
.card h3{margin-bottom:.4em}
.card p{font-size:.98rem;color:var(--muted)}
.card .more{margin-top:auto;font-weight:600;text-decoration:none}
.card .more::after{content:" →"}
.icon{width:42px;height:42px;border-radius:9px;background:var(--copper-soft);color:var(--copper-ink);display:grid;place-items:center;margin-bottom:16px}
.icon svg{width:22px;height:22px}
.ticks{list-style:none;padding:0;margin:0 0 1em}
.ticks li{position:relative;padding-left:26px;margin:7px 0;font-size:.98rem}
.ticks li::before{content:"";position:absolute;left:2px;top:.55em;width:12px;height:7px;border-left:2px solid var(--copper);border-bottom:2px solid var(--copper);transform:rotate(-45deg)}

/* Steps (a real sequence) */
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;counter-reset:step;list-style:none;padding:0;margin:0}
@media (max-width:980px){.steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.steps{grid-template-columns:minmax(0,1fr)}}
.steps li{counter-increment:step;border-top:3px solid var(--copper);padding-top:18px}
.steps li::before{content:"Step " counter(step);display:block;font:600 .78rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--copper-ink);margin-bottom:8px}
.steps h3{font-size:1.15rem}
.steps p{font-size:.96rem;color:var(--muted);margin:0}

/* Chips */
.chips{display:flex;flex-wrap:wrap;gap:10px;list-style:none;padding:0;margin:0}
.chips li{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-size:.95rem;color:var(--ink)}

/* Split */
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:56px;align-items:start}
@media (max-width:880px){.split{grid-template-columns:minmax(0,1fr);gap:32px}}

/* Table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:560px;font-size:.96rem}
th,td{text-align:left;padding:13px 16px;border-top:1px solid var(--line);vertical-align:top}
thead th{border-top:0;font:600 .76rem var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);background:var(--bg)}

/* FAQ */
.faq details{border-top:1px solid var(--line);padding-block:4px}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:18px 36px 18px 0;font:700 1.08rem var(--display);color:var(--ink);position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:12px;font:400 1.6rem var(--body);color:var(--copper)}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--muted)}

/* CTA band */
.cta{background:var(--copper);color:#fff;border-radius:16px;padding:48px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:28px;align-items:center}
.cta h2{color:#fff;margin-bottom:.3em}
.cta p{color:#fff;opacity:.92;margin:0}
.cta .btn{background:#fff;color:var(--copper-ink)}
.cta .btn:hover{background:var(--ink);color:#fff}
@media (prefers-color-scheme: dark){.cta{background:#7a3a14}.cta .btn{color:#7a3a14}}
@media (max-width:760px){.cta{grid-template-columns:minmax(0,1fr);padding:32px 24px}}

/* Page header (inner pages) */
.page-head{padding-block:64px 40px;border-bottom:1px solid var(--line)}
.crumbs{font:500 .85rem var(--mono);color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}

/* Forms */
form{display:grid;gap:16px}
.field{display:grid;gap:6px;min-width:0}
.field label{font-weight:600;font-size:.95rem;color:var(--ink)}
.field .hint{font-size:.85rem;color:var(--muted)}
input,select,textarea{font:inherit;font-size:1rem;color:var(--fg);background:var(--surface);border:1.5px solid var(--line);border-radius:8px;padding:12px 14px;width:100%}
input:focus,select:focus,textarea:focus{border-color:var(--copper);outline:none;box-shadow:0 0 0 3px var(--copper-soft)}
textarea{min-height:140px;resize:vertical}
.row2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px}
@media (max-width:560px){.row2{grid-template-columns:minmax(0,1fr)}}
.hp{position:absolute;left:-5000px}
.form-status{font-weight:600}
.form-status.ok{color:var(--ok)}
.contact-list{list-style:none;padding:0;margin:0;display:grid;gap:18px}
.contact-list li{display:grid;gap:2px}
.contact-list span{font:600 .76rem var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.contact-list a,.contact-list b{font-size:1.15rem;color:var(--ink);font-weight:600;text-decoration:none}

/* Footer */
.site-footer{background:var(--band);color:var(--band-muted);padding-block:56px 32px;font-size:.95rem}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
@media (max-width:880px){.foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.foot-grid{grid-template-columns:minmax(0,1fr)}}
.site-footer h4{font:600 .78rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:#fff;margin:0 0 12px}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.site-footer a{color:var(--band-fg);text-decoration:none}
.site-footer a:hover{color:#e9a070}
.site-footer .logo{color:#fff;margin-bottom:12px}
.legal{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:20px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:.85rem}