/* ==========================================================================
   Centric RF, LLC — site styles
   Palette: electric cobalt, midnight indigo, porcelain white, circuit gray,
   restrained signal cyan. System font stacks only (no external requests).
   ========================================================================== */


:root{
  --cobalt:#0e1ecd;          /* sampled from the supplied logo */
  --cobalt-dark:#0a1699;
  --cobalt-soft:#e8ebfc;
  --indigo:#0a0f33;
  --indigo-2:#111847;
  --indigo-3:#1b2468;
  --porcelain:#f6f8fc;
  --white:#ffffff;
  --gray-100:#edf0f7;
  --gray-200:#dde2ee;
  --gray-300:#c2cadc;
  --gray-500:#6b7490;
  --gray-600:#4a5372;
  --ink:#0c1130;
  --cyan:#19d3f2;
  --cyan-dark:#0aa6c0;

  --font-head:"Avenir Next","Segoe UI Variable Display","Segoe UI","Helvetica Neue",system-ui,-apple-system,Roboto,Arial,sans-serif;
  --font-body:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Roboto,Arial,sans-serif;
  --font-mono:ui-monospace,"SF Mono","Cascadia Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --wrap:1180px;
  --gutter:clamp(1.25rem,4vw,2.5rem);
  --section:clamp(3.5rem,8vw,6.5rem);
  --ease:cubic-bezier(.2,.7,.2,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5.5rem}
body{margin:0;font-family:var(--font-body);font-size:1.0625rem;line-height:1.65;color:var(--ink);background:var(--white);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg{max-width:100%;display:block}
img{height:auto}
a{color:var(--cobalt);text-underline-offset:.18em;text-decoration-thickness:.07em}
a:hover{color:var(--cobalt-dark)}
:focus-visible{outline:3px solid var(--cyan-dark);outline-offset:3px;border-radius:2px}
.on-dark :focus-visible,.site-footer :focus-visible,.utility :focus-visible{outline-color:var(--cyan)}
h1,h2,h3,h4{font-family:var(--font-head);color:var(--indigo);line-height:1.12;letter-spacing:-.02em;margin:0 0 .6em;font-weight:600}
h1{font-size:clamp(2.05rem,4.6vw,3.5rem);letter-spacing:-.03em}
h2{font-size:clamp(1.7rem,3.2vw,2.5rem)}
h3{font-size:1.3rem;letter-spacing:-.01em}
h4{font-size:1.02rem;letter-spacing:0}
p{margin:0 0 1.1em}
ul{margin:0 0 1.2em;padding-left:1.2em}
li{margin-bottom:.4em}
.on-dark{color:#d7dcf5}
.on-dark h1,.on-dark h2,.on-dark h3,.on-dark h4{color:#fff}
.on-dark a:not(.btn){color:var(--cyan)}

.skip-link{position:absolute;left:-999px;top:0;background:var(--indigo);color:#fff;padding:.75rem 1rem;z-index:100}
.skip-link:focus{left:0}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:var(--section)}
.section--porcelain{background:var(--porcelain)}
.section--gray{background:var(--gray-100)}
.section--indigo{background:var(--indigo);color:#d7dcf5;position:relative;overflow:hidden}
.section--indigo h2,.section--indigo h3{color:#fff}
.section--indigo a:not(.btn){color:var(--cyan)}
.lede{font-size:clamp(1.1rem,1.6vw,1.25rem);color:var(--gray-600);max-width:46rem}
.on-dark .lede,.section--indigo .lede{color:#c3caf0}
.eyebrow{font-family:var(--font-mono);font-size:.78rem;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--cobalt);display:flex;align-items:center;gap:.7rem;margin:0 0 1.1rem}
.eyebrow::before{content:"";width:2.2rem;height:2px;background:currentColor;flex:none}
.section--indigo .eyebrow,.on-dark .eyebrow{color:var(--cyan)}
.section-head{max-width:46rem;margin-bottom:clamp(2rem,4vw,3.25rem)}
.section-head p:last-child{margin-bottom:0}

/* ---------- Utility strip + header ---------- */
.utility{background:var(--indigo);color:#c3caf0;font-size:.86rem}
.utility .wrap{display:flex;justify-content:space-between;align-items:center;gap:1rem;min-height:2.5rem;flex-wrap:wrap;padding-block:.35rem}
.utility a{color:#fff;text-decoration:none;font-family:var(--font-mono);font-size:.82rem;letter-spacing:.02em}
.utility a:hover{color:var(--cyan);text-decoration:underline}
.utility-links{display:flex;gap:1.5rem;flex-wrap:wrap}
.utility-note{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:#98a2dd}
.site-header{position:sticky;top:0;z-index:50;background:var(--white);border-bottom:1px solid var(--gray-200)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;min-height:4.6rem}
.brand{display:block;flex:none;line-height:0}
.brand img{width:clamp(138px,15vw,172px);height:auto}
.nav-toggle{display:none;align-items:center;gap:.6rem;background:none;border:1px solid var(--gray-300);padding:.6rem .9rem;font:inherit;font-family:var(--font-mono);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--indigo);cursor:pointer}
.nav-toggle:hover{border-color:var(--cobalt);color:var(--cobalt)}
.nav-toggle .bars{width:18px;height:12px;position:relative}
.nav-toggle .bars i{position:absolute;left:0;width:100%;height:2px;background:currentColor;transition:transform .25s var(--ease),opacity .2s,top .25s var(--ease)}
.nav-toggle .bars i:nth-child(1){top:0}.nav-toggle .bars i:nth-child(2){top:5px}.nav-toggle .bars i:nth-child(3){top:10px}
.nav-toggle[aria-expanded="true"] .bars i:nth-child(1){top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .bars i:nth-child(3){top:5px;transform:rotate(-45deg)}
.primary-nav{display:flex;align-items:center;gap:1.9rem}
.primary-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:1.6rem;align-items:center}
.primary-nav li{margin:0}
.primary-nav a:not(.btn){position:relative;display:block;padding:.4rem 0;color:var(--indigo);text-decoration:none;font-weight:500;font-size:.97rem}
.primary-nav a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:100%;background:var(--cobalt);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease)}
.primary-nav a:not(.btn):hover{color:var(--cobalt)}
.primary-nav a:not(.btn):hover::after,.primary-nav a[aria-current="page"]::after{transform:scaleX(1)}
.primary-nav a[aria-current="page"]{color:var(--cobalt)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.6rem;padding:.85rem 1.45rem;font-family:var(--font-head);font-weight:600;font-size:1rem;letter-spacing:-.005em;line-height:1.2;text-decoration:none;border:2px solid transparent;cursor:pointer;transition:background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease);text-align:center}
.btn svg{width:1.05em;height:1.05em;flex:none;transition:transform .25s var(--ease)}
.btn:hover svg.arrow{transform:translateX(4px)}
.btn--primary{background:var(--cobalt);color:#fff}
.btn--primary:hover{background:var(--cobalt-dark);color:#fff}
.btn--signal{background:var(--cyan);color:var(--indigo)}
.btn--signal:hover{background:#4fe0f7;color:var(--indigo)}
.btn--ghost{background:transparent;color:var(--cobalt);border-color:var(--cobalt)}
.btn--ghost:hover{background:var(--cobalt);color:#fff}
.btn--ghost-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn--ghost-light:hover{background:#fff;color:var(--indigo);border-color:#fff}
.btn--sm{padding:.6rem 1.05rem;font-size:.93rem}
.btn-row{display:flex;flex-wrap:wrap;gap:.9rem}

/* ---------- Hero ---------- */
.hero{position:relative;background:var(--white);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;align-items:stretch}
.hero-copy{padding:clamp(2.5rem,6vw,5rem) clamp(1.5rem,4vw,3.5rem) clamp(2.5rem,6vw,5rem) max(var(--gutter),calc((100vw - var(--wrap))/2));align-self:center}
.hero-logo{width:min(320px,72%);margin:0 0 clamp(1.4rem,2.5vw,2rem)}
.hero h1{max-width:24ch;font-size:clamp(2rem,3.9vw,3.15rem)}
.hero .lede{margin-bottom:1.8rem}
.hero-art{position:relative;background:var(--indigo);min-height:420px;color:#fff;overflow:hidden}
.hero-art svg{position:absolute;inset:0;width:100%;height:100%}
.art-caption{position:absolute;left:1.1rem;bottom:.8rem;right:1.1rem;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;color:#8f99d8;z-index:2}
.signal-line{stroke-dasharray:6 8;animation:signal 14s linear infinite}
@keyframes signal{to{stroke-dashoffset:-280}}
.ring-pulse{transform-origin:center;transform-box:fill-box;animation:pulse 7s var(--ease) infinite}
.ring-pulse.d2{animation-delay:1.1s}.ring-pulse.d3{animation-delay:2.2s}
@keyframes pulse{0%,100%{opacity:.3}50%{opacity:.9}}

/* Category rail */
.rail{border-block:1px solid var(--gray-200);background:var(--porcelain)}
.rail ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;justify-content:space-between;gap:.5rem 1.5rem}
.rail li{margin:0;padding:1rem 0;font-family:var(--font-mono);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gray-600);display:flex;align-items:center;gap:.6rem}
.rail li::before{content:"";width:9px;height:9px;border:2px solid var(--cobalt);border-radius:50%;flex:none}

/* ---------- Cards ---------- */
.grid{display:grid;gap:clamp(1rem,2vw,1.6rem)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{position:relative;background:var(--white);border:1px solid var(--gray-200);padding:clamp(1.4rem,2.4vw,2rem);display:flex;flex-direction:column;transition:border-color .3s var(--ease),transform .3s var(--ease)}
.card::before,.card::after{content:"";position:absolute;width:14px;height:14px;border:2px solid var(--cobalt);opacity:.9;pointer-events:none}
.card::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.card::after{right:-1px;bottom:-1px;border-left:0;border-top:0}
.card:hover{border-color:var(--cobalt)}
.card h3{margin-bottom:.5rem}
.card p:last-child{margin-bottom:0}
.card .idx{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.14em;color:var(--gray-500);margin-bottom:.9rem;display:block}
.section--porcelain .card{background:var(--white)}
.drawing{color:var(--cobalt);background:var(--porcelain);border:1px solid var(--gray-200);margin-bottom:1.3rem;padding:.9rem 1rem;position:relative}
.drawing svg{width:100%;height:auto;max-height:132px}
.drawing .tag{position:absolute;right:.6rem;top:.4rem;font-family:var(--font-mono);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gray-500)}
.detail-list{list-style:none;padding:0;margin:1rem 0 0;border-top:1px solid var(--gray-200)}
.detail-list li{padding:.55rem 0 .55rem 1.4rem;border-bottom:1px dashed var(--gray-200);margin:0;position:relative;font-size:.95rem;color:var(--gray-600)}
.detail-list li::before{content:"";position:absolute;left:.1rem;top:1.05em;width:.5rem;height:.5rem;border:2px solid var(--cobalt);border-radius:50%}
.detail-label{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--cobalt);margin:1.1rem 0 0}
.icon{width:48px;height:48px;color:var(--cobalt);margin-bottom:1rem}
.on-dark .icon,.section--indigo .icon{color:var(--cyan)}

/* Split blocks */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4.5rem);align-items:center}
.split--top{align-items:start}
.panel{background:var(--indigo);color:#d7dcf5;padding:clamp(1.5rem,3vw,2.4rem);position:relative}
.panel h3{color:#fff}
.panel .drawing{background:var(--indigo-2);border-color:var(--indigo-3);color:var(--cyan)}
.panel .drawing .tag{color:#8f99d8}
.checklist{list-style:none;padding:0;margin:0 0 1.4rem}
.checklist li{position:relative;padding-left:1.8rem;margin-bottom:.7rem}
.checklist li::before{content:"";position:absolute;left:0;top:.45em;width:.95rem;height:.55rem;border-left:2.5px solid var(--cobalt);border-bottom:2.5px solid var(--cobalt);transform:rotate(-45deg) scale(.9)}
.on-dark .checklist li::before,.section--indigo .checklist li::before,.panel .checklist li::before{border-color:var(--cyan)}

/* Indigo section decoration */
.rings-deco{position:absolute;right:-8%;top:50%;transform:translateY(-50%);width:min(620px,70vw);height:auto;color:#2b36a0;opacity:.45;pointer-events:none}
.section--indigo>.wrap{position:relative;z-index:1}

/* Steps */
.steps{list-style:none;padding:0;margin:0;counter-reset:step;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1.4rem}
.steps li{counter-increment:step;margin:0;padding-top:1.1rem;border-top:2px solid var(--cobalt);position:relative}
.steps li::before{content:"0" counter(step);font-family:var(--font-mono);font-size:.8rem;letter-spacing:.14em;color:var(--cobalt);display:block;margin-bottom:.5rem}
.steps h3{font-size:1.1rem;margin-bottom:.4rem}
.steps p{font-size:.96rem;color:var(--gray-600)}

/* Notice */
.notice{border-left:4px solid var(--cobalt);background:var(--cobalt-soft);padding:1rem 1.25rem;font-size:.97rem;color:var(--indigo)}
.notice p:last-child{margin:0}
.section--indigo .notice,.panel .notice{background:rgba(255,255,255,.07);border-left-color:var(--cyan);color:#dfe3fa}

/* Page header */
.page-head{position:relative;background:var(--indigo);color:#d7dcf5;overflow:hidden;padding-block:clamp(3rem,7vw,5.5rem)}
.page-head h1{color:#fff;max-width:20ch;margin-bottom:.5em}
.page-head .lede{color:#c3caf0;margin:0}
.page-head .rings-deco{right:-5%;opacity:.55}
.page-head .wrap{position:relative;z-index:1}
.crumbs{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:#98a2dd;margin-bottom:1.2rem}
.crumbs a{color:#c3caf0;text-decoration:none}
.crumbs a:hover{color:var(--cyan);text-decoration:underline}
.crumbs span[aria-hidden]{margin-inline:.5rem;opacity:.6}

/* Contact */
.contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(2rem,4vw,3.5rem);align-items:start}
.contact-card{background:var(--indigo);color:#d7dcf5;padding:clamp(1.5rem,3vw,2.2rem);position:sticky;top:6.5rem}
.contact-card h2{color:#fff;font-size:1.4rem}
.contact-card address{font-style:normal;line-height:1.7;margin-bottom:1.4rem}
.contact-card .name{font-family:var(--font-head);font-weight:600;color:#fff;font-size:1.15rem;display:block;letter-spacing:.01em}
.contact-line{display:flex;gap:.9rem;align-items:flex-start;margin-bottom:1.1rem}
.contact-line svg{width:22px;height:22px;color:var(--cyan);flex:none;margin-top:.2rem}
.contact-line .lbl{display:block;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:#98a2dd}
.contact-line a{color:#fff;text-decoration:none;font-weight:500;word-break:break-word}
.contact-line a:hover{color:var(--cyan);text-decoration:underline}
.contact-card .btn-row{margin-top:1.5rem}
.contact-card .map-link{display:inline-block;margin-top:1.2rem;font-size:.92rem;color:var(--cyan)}

/* Forms */
.form-card{background:var(--white);border:1px solid var(--gray-200);padding:clamp(1.4rem,3vw,2.4rem);position:relative}
.form-card::before,.form-card::after{content:"";position:absolute;width:18px;height:18px;border:2px solid var(--cobalt);pointer-events:none}
.form-card::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.form-card::after{right:-1px;bottom:-1px;border-left:0;border-top:0}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.1rem 1.25rem}
.field{display:flex;flex-direction:column;gap:.4rem}
.field.full{grid-column:1/-1}
.field label,.field .label{font-weight:600;font-size:.94rem;color:var(--indigo)}
.field .opt{font-weight:400;color:var(--gray-500);font-size:.85rem}
.field .req{color:var(--cobalt)}
.field input,.field select,.field textarea{width:100%;font:inherit;font-size:1rem;color:var(--ink);background:var(--porcelain);border:1px solid var(--gray-300);border-bottom:2px solid var(--gray-500);border-radius:0;padding:.7rem .8rem;transition:border-color .2s,background-color .2s}
.field textarea{min-height:7.5rem;resize:vertical}
.field input:hover,.field select:hover,.field textarea:hover{border-color:var(--cobalt)}
.field input:focus,.field select:focus,.field textarea:focus{outline:3px solid rgba(14,30,205,.25);outline-offset:0;border-color:var(--cobalt);background:#fff}
.field input[type=file]{padding:.6rem;background:#fff;border-style:dashed}
.field .hint{font-size:.85rem;color:var(--gray-600);margin:0}
.field input:user-invalid,.field select:user-invalid{border-color:#b3261e}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-note{font-size:.9rem;color:var(--gray-600);margin:1.2rem 0}
.form-actions{display:flex;gap:1rem;align-items:center;flex-wrap:wrap}
.form-status{margin-top:1.2rem;padding:1rem 1.2rem;border-left:4px solid var(--cobalt);background:var(--cobalt-soft);color:var(--indigo);font-size:.97rem}
.form-status[hidden]{display:none}
.form-status.is-error{border-left-color:#b3261e;background:#fdeceb}
.form-status.is-success{border-left-color:#14783a;background:#e8f6ec}
.form-status p{margin:0 0 .6rem}.form-status p:last-child{margin:0}

/* Legal pages */
.legal{max-width:50rem}
.legal h2{font-size:1.4rem;margin-top:2.4rem;padding-top:1.4rem;border-top:1px solid var(--gray-200)}
.legal h2:first-of-type{margin-top:1.5rem}
.legal h3{font-size:1.08rem;margin-top:1.4rem}
.legal .updated{font-family:var(--font-mono);font-size:.85rem;letter-spacing:.06em;color:var(--gray-600)}
.legal li{margin-bottom:.5rem}
.toc{background:var(--porcelain);border:1px solid var(--gray-200);padding:1.2rem 1.5rem;margin:1.5rem 0 0}
.toc p{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gray-600);margin-bottom:.6rem}
.toc ol{margin:0;padding-left:1.3rem;columns:2;column-gap:2rem}
.toc li{margin-bottom:.3rem;font-size:.95rem;break-inside:avoid}

/* Fact table (About) */
.facts{width:100%;border-collapse:collapse;font-size:.98rem}
.facts th,.facts td{text-align:left;padding:.85rem 0;border-bottom:1px solid var(--gray-200);vertical-align:top}
.facts th{width:36%;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gray-600);font-weight:500;padding-right:1rem}

/* CTA band */
.cta-band .inner{display:grid;grid-template-columns:1.2fr .8fr;gap:2.5rem;align-items:center}
.cta-band h2{margin-bottom:.4em}
.cta-band .btn-row{justify-content:flex-end}

/* ---------- Footer ---------- */
.site-footer{background:var(--indigo);color:#c3caf0;position:relative;overflow:hidden}
.footer-wave{display:block;width:100%;height:28px;color:#2f3bb0}
.footer-grid{display:grid;grid-template-columns:1.3fr .8fr .9fr;gap:clamp(1.5rem,4vw,3.5rem);padding-block:clamp(2.5rem,5vw,4rem)}
.footer-logo{display:inline-block;background:#fff;padding:.7rem .9rem;line-height:0;margin-bottom:1.2rem}
.footer-logo img{width:150px;height:auto}
.site-footer h2{font-family:var(--font-mono);font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:#98a2dd;font-weight:500;margin-bottom:1rem}
.site-footer address{font-style:normal;line-height:1.75}
.site-footer address .name{color:#fff;font-weight:600;font-family:var(--font-head);display:block}
.site-footer a{color:#fff;text-decoration:none}
.site-footer a:hover{color:var(--cyan);text-decoration:underline}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin-bottom:.5rem}
.footer-base{border-top:1px solid var(--indigo-3);padding-block:1.2rem;font-size:.88rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;color:#98a2dd}
.footer-base a{color:#d7dcf5}

/* ---------- Reveal (progressive enhancement) ---------- */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.js .reveal.in{opacity:1;transform:none}
.js .reveal.d1{transition-delay:.08s}.js .reveal.d2{transition-delay:.16s}.js .reveal.d3{transition-delay:.24s}

/* ---------- Responsive ---------- */
@media (max-width:1100px){
  .nav-toggle{display:inline-flex}
  .primary-nav{position:absolute;left:0;right:0;top:100%;background:var(--white);border-bottom:1px solid var(--gray-200);flex-direction:column;align-items:stretch;gap:0;padding:.5rem var(--gutter) 1.4rem;display:none;box-shadow:0 18px 30px -22px rgba(10,15,51,.5)}
  .primary-nav.open{display:flex}
  .primary-nav ul{flex-direction:column;align-items:stretch;gap:0}
  .primary-nav li{border-bottom:1px solid var(--gray-200)}
  .primary-nav a:not(.btn){padding:.95rem 0;font-size:1.05rem}
  .primary-nav a:not(.btn)::after{display:none}
  .primary-nav a[aria-current="page"]{box-shadow:inset 3px 0 0 var(--cobalt);padding-left:.9rem}
  .primary-nav .btn{margin-top:1.1rem}
}
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr}
  .hero-copy{padding-right:var(--gutter);padding-left:var(--gutter)}
  .hero-art{min-height:380px}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .split,.contact-grid,.cta-band .inner{grid-template-columns:1fr}
  .cta-band .btn-row{justify-content:flex-start}
  .contact-card{position:static}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-grid>div:first-child{grid-column:1/-1}
}
@media (max-width:640px){
  body{font-size:1rem}
  .grid-2,.grid-3,.form-grid,.steps{grid-template-columns:1fr}
  .utility-note{display:none}
  .utility .wrap{justify-content:center}
  .footer-grid{grid-template-columns:1fr}
  .toc ol{columns:1}
  .btn-row .btn{flex:1 1 100%}
  .hero-art{min-height:320px}
  .art-label{display:none}
  .rail ul{justify-content:flex-start}
  .facts th{width:42%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .js .reveal{opacity:1;transform:none}
}
@media print{
  .utility,.site-header,.site-footer .footer-wave,.skip-link{display:none}
  .page-head{background:none;color:#000}.page-head h1{color:#000}
}

/* ---------- Additions: cobalt band, category rows, chips, misc ---------- */
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.section--cobalt{background:var(--cobalt);color:#e3e7ff}
.section--cobalt h2,.section--cobalt h3{color:#fff}
.section--cobalt .lede{color:#dfe4ff}
.section--cobalt .eyebrow{color:var(--cyan)}
.section--cobalt :focus-visible{outline-color:#fff}
.section--cobalt .checklist li::before{border-color:var(--cyan)}
.link-arrow{display:inline-flex;align-items:center;gap:.5rem;font-weight:600;text-decoration:none;font-family:var(--font-head)}
.link-arrow svg{width:1em;height:1em;transition:transform .25s var(--ease)}
.link-arrow:hover svg{transform:translateX(4px)}
.link-arrow:hover{text-decoration:underline}
.card .link-arrow{margin-top:auto;padding-top:1rem}
.cat-list{margin-top:1.5rem}
.cat-row{display:grid;grid-template-columns:5fr 7fr;gap:clamp(1.5rem,4vw,3.5rem);padding-block:clamp(2.2rem,4.5vw,3.5rem);border-bottom:1px solid var(--gray-200);align-items:start;scroll-margin-top:6rem}
.cat-row:last-child{border-bottom:0}
.cat-row .drawing{margin-bottom:0;padding:1.6rem 1.4rem}
.cat-row .drawing svg{max-height:none}
.idx-label{display:block;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;color:var(--gray-500);margin-bottom:.9rem}
.cat-row h2{font-size:clamp(1.6rem,2.6vw,2.1rem);margin-bottom:.3em}
.cat-tagline{font-family:var(--font-head);font-weight:500;color:var(--cobalt);font-size:1.08rem;margin-bottom:1em}
.card[id],.cat-row[id]{scroll-margin-top:6rem}
.app-list{border-top:1px solid var(--gray-200)}
.app-row{display:grid;grid-template-columns:5rem 1fr;gap:1.5rem;padding-block:clamp(1.8rem,3.5vw,2.8rem);border-bottom:1px solid var(--gray-200)}
.app-row .icon{width:56px;height:56px;margin:0}
.app-row h2{font-size:clamp(1.4rem,2.4vw,1.8rem);margin-bottom:.25em}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:.5rem;padding:0;margin:1rem 0 0}
.chips li{margin:0;padding:.3rem .7rem;border:1px solid var(--gray-300);font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gray-600);background:var(--porcelain)}
.contact-card .name,.contact-card address{color:#d7dcf5}
@media (max-width:960px){.cat-row{grid-template-columns:1fr}}
@media (max-width:640px){.app-row{grid-template-columns:1fr;gap:.8rem}.cat-row .drawing{padding:1rem}}

.drawing.duo{display:grid;grid-template-columns:1fr 1fr;gap:.4rem;padding:1.6rem .6rem .7rem}
.drawing.duo svg{max-height:none}
.contact-card .contact-line:last-of-type{margin-bottom:0}
.card .drawing{min-height:172px;display:flex;align-items:center}
.card .drawing svg{width:100%}
.card .drawing.duo{display:grid;align-content:center;padding-top:1.6rem}
@media (min-width:961px){.cat-row>div:first-child{position:sticky;top:6.5rem}}