/* Pittsburgh Embedded — single-page site styles
   No frameworks, no external fonts. Dark theme with a copper accent. */

:root {
  --bg: #0b1220;
  --bg-alt: #0f1a2e;
  --panel: #131f36;
  --panel-2: #182640;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: #e8edf6;
  --text-muted: #9aa8c2;
  --accent: #e9a24b;       /* copper */
  --accent-2: #4fd1c5;     /* solder-mask teal */
  --accent-ink: #1a1206;
  --danger: #ff7a7a;
  --ok: #7ee2a8;
  --radius: 14px;
  --radius-sm: 9px;
  --wrap: 1140px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 0.5em; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.6vw, 3.6rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 750; }
h3 { font-size: 1.15rem; font-weight: 700; }
p { margin: 0 0 1em; }
button { font: inherit; color: inherit; }
.muted { color: var(--text-muted); }
.accent { color: var(--accent); }
.wrap { width: min(var(--wrap), 100% - 2.5rem); margin-inline: auto; }

.skip {
  position: absolute; left: -999px; top: 0; padding: .5rem 1rem;
  background: var(--accent); color: var(--accent-ink); z-index: 100;
}
.skip:focus { left: 1rem; top: 1rem; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.9rem;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: 0.8rem 1.35rem;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 24px rgba(233, 162, 75, 0.25); text-decoration: none; }
.btn:active { transform: translateY(0); }
.btn--ghost { background: transparent; color: var(--text); border-color: var(--line-strong); }
.btn--ghost:hover { border-color: var(--accent); box-shadow: none; }
.btn--sm { padding: 0.55rem 1rem; font-size: 0.92rem; }
.btn[disabled] { opacity: .6; cursor: progress; transform: none; box-shadow: none; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 18, 32, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: inline-flex; align-items: center; color: var(--text); font-size: 1.2rem; letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.brand strong { color: var(--accent); font-weight: 800; }
.nav__links { display: flex; align-items: center; gap: 1.6rem; }
.nav__links a { color: var(--text-muted); font-weight: 500; }
.nav__links a:hover { color: var(--text); text-decoration: none; }
.nav__links .btn { color: var(--accent-ink); }
.nav__toggle {
  display: none; flex-direction: column; gap: 5px; padding: .5rem;
  background: none; border: 0; cursor: pointer;
}
.nav__toggle span { width: 22px; height: 2px; background: var(--text); display: block; border-radius: 2px; }
.nav__mobile { display: none; }
.nav__mobile a { display: block; padding: .9rem 1.25rem; border-top: 1px solid var(--line); color: var(--text); }

@media (max-width: 820px) {
  .nav__links { display: none; }
  .nav__toggle { display: flex; }
  .nav__mobile:not([hidden]) { display: block; background: var(--bg-alt); }
}

/* ---------- selected intro: layout to bring-up ---------- */
.hero { overflow: hidden; padding: 4.5rem 0; background: #11262d; border-bottom: 1px solid #354352; }
.concept__inner { display: grid; grid-template-columns: 1fr; gap: 2.5rem; }
.concept__copy { max-width: 880px; }
.hero__title { max-width: 880px; font-size: clamp(2.15rem, 3.6vw, 3.25rem); font-weight: 800; letter-spacing: -.035em; }
.hero__title .accent { color: var(--accent); }
.hero .lead { max-width: 750px; color: #b4bfd1; font-size: 1.04rem; }
.hero__cta { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.8rem; }
.process-plate { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.2rem; align-items: start; }
.process-plate figure { margin: 0; min-width: 0; }
.process-plate img { width: 100%; height: auto; aspect-ratio: 1.6; object-fit: cover; }
@media (max-width: 800px) {
 .hero { padding: 3rem 0; }
 .process-plate { gap: .5rem; }
}

/* ---------- sections ---------- */
.section { padding: clamp(3.5rem, 8vw, 6rem) 0; }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section__head { max-width: 680px; margin-bottom: 2.4rem; }
.section__head .muted { font-size: 1.05rem; }

.grid { display: grid; gap: 1.1rem; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid--3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid--3, .grid--2 { grid-template-columns: 1fr; } }

/* ---------- cards ---------- */
.card {
  display: block; text-align: left; width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.4rem 1.2rem;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.card h3 { margin-top: .6rem; }
.card p { color: var(--text-muted); margin: 0; font-size: .95rem; }
.card--link { cursor: pointer; position: relative; }
.card--link::after {
  content: "Ask about this \2192";
  display: block; margin-top: .9rem;
  font-family: var(--mono); font-size: .75rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); opacity: 0; transform: translateY(4px);
  transition: opacity .18s ease, transform .18s ease;
}
.card--link:hover, .card--link:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(233, 162, 75, 0.55);
  background: var(--panel-2);
  outline: none;
}
.card--link:hover::after, .card--link:focus-visible::after { opacity: 1; transform: none; }
.card__icon {
  font-family: var(--mono); font-size: .8rem; color: var(--accent);
  border: 1px solid rgba(233, 162, 75, 0.4); border-radius: 6px; padding: .15rem .45rem;
}

.card--photo { padding-right: 7.2rem; }
.card__photo {
  position: absolute; top: 1.1rem; right: 1.1rem; width: 96px; height: 96px;
  object-fit: cover; border-radius: var(--radius-sm); border: 1px solid var(--line-strong);
  opacity: .9; transition: opacity .18s ease;
}
.card--photo:hover .card__photo { opacity: 1; }
@media (max-width: 600px) { .card--photo { padding-right: 1.4rem; } .card__photo { position: static; margin-bottom: .8rem; } }

/* ---------- expertise features ---------- */
.feature {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex; flex-direction: column; gap: .4rem; align-items: flex-start;
}
.feature__art { color: var(--accent-2); margin-bottom: .6rem; }
.feature .chips { margin: .2rem 0 1rem; }
.chips--sm .chip { padding: .3rem .7rem; font-size: .85rem; }
.feature h3 { font-size: 1.4rem; }
.feature p { color: var(--text-muted); }

/* ---------- case study ---------- */
.case { display: grid; grid-template-columns: 1.15fr 1fr; gap: 2.5rem; align-items: start; }
@media (max-width: 900px) { .case { grid-template-columns: 1fr; } }
.case__main {
  margin: 0; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}
.case__main img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; background: #0a0f1a; }
.case__thumbs { display: grid; grid-template-columns: repeat(5, 1fr); gap: .6rem; margin-top: .8rem; }
.thumb {
  flex: 1; padding: 0; background: var(--panel); border: 2px solid transparent;
  border-radius: var(--radius-sm); overflow: hidden; cursor: pointer; transition: border-color .15s ease;
}
.thumb img { aspect-ratio: 1; object-fit: cover; width: 100%; }
.thumb.is-active, .thumb:hover { border-color: var(--accent); }
.case__body h3 { margin-top: .2rem; }
.case__body h3 + p { color: var(--text-muted); }
.checks { list-style: none; padding: 0; margin: 0 0 1.4rem; }
.checks li { position: relative; padding-left: 1.6rem; margin-bottom: .5rem; color: var(--text-muted); }
.checks li::before {
  content: ""; position: absolute; left: 0; top: .55em; width: .9rem; height: .9rem;
  border-radius: 50%; background: rgba(79, 209, 197, 0.15); border: 1px solid var(--accent-2);
}
.checks li::after {
  content: ""; position: absolute; left: .3rem; top: .72em; width: .35rem; height: .2rem;
  border-left: 2px solid var(--accent-2); border-bottom: 2px solid var(--accent-2); transform: rotate(-45deg);
}
.case__cta { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; }

/* ---------- experience (inside the expertise section) ---------- */
.experience { margin-top: 3rem; padding-top: 2.4rem; border-top: 1px solid var(--line); }
.experience__head { margin-bottom: 1.4rem; }
.experience__head h3 { font-size: 1.35rem; }
.chips-block h4 { margin: 0 0 .8rem; font-size: 1rem; font-weight: 700; }

/* ---------- chips ---------- */
.chips-block { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem; }
.chips { display: flex; flex-wrap: wrap; gap: .6rem; }
.chip {
  border: 1px solid var(--line-strong); background: transparent; color: var(--text);
  padding: .5rem .95rem; border-radius: 999px; cursor: pointer; font-weight: 500;
  transition: border-color .15s ease, background .15s ease, transform .15s ease;
}
.chip:hover, .chip:focus-visible { border-color: var(--accent); background: rgba(233, 162, 75, 0.12); transform: translateY(-1px); outline: none; }

/* ---------- contact ---------- */
.contact { display: grid; grid-template-columns: 1fr 1.3fr; gap: 3rem; align-items: start; }
@media (max-width: 900px) { .contact { grid-template-columns: 1fr; gap: 2rem; } }
.contact__ways { display: flex; flex-direction: column; gap: .7rem; margin-top: 1.6rem; }
.contact__way {
  display: flex; flex-direction: column; gap: .1rem; padding: .9rem 1.1rem;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-sm);
  color: var(--text); transition: border-color .15s ease, transform .15s ease;
}
.contact__way:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-1px); }
.contact__way-label { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--text-muted); }
.contact__way-value { font-weight: 700; font-size: 1.05rem; color: var(--accent-2); overflow-wrap: anywhere; }
.form {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.8rem; display: flex; flex-direction: column; gap: 1rem;
}
.form label { display: flex; flex-direction: column; gap: .35rem; font-size: .92rem; font-weight: 600; }
.form label em { font-weight: 400; color: var(--text-muted); font-style: normal; }
.form input, .form textarea {
  font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line-strong); border-radius: var(--radius-sm);
  padding: .7rem .85rem; width: 100%;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form input:focus, .form textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(233, 162, 75, 0.2);
}
.form textarea { resize: vertical; min-height: 130px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 560px) { .form__row { grid-template-columns: 1fr; } }
.form__topic {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: rgba(233, 162, 75, 0.12); border: 1px solid rgba(233, 162, 75, 0.4);
  border-radius: var(--radius-sm); padding: .55rem .9rem; font-size: .92rem;
}
.form__topic[hidden] { display: none; }   /* author display:flex would otherwise beat the hidden attribute */
.form__topic strong { color: var(--accent); }
.form__topic button { background: none; border: 0; cursor: pointer; font-size: 1.2rem; line-height: 1; color: var(--text-muted); padding: 0 .2rem; }
.form__topic button:hover { color: var(--text); }
.hp { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; overflow: hidden; }
.form__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-top: .3rem; }
.form__status { margin: 0; font-size: .92rem; color: var(--text-muted); }
.form__status.is-ok { color: var(--ok); }
.form__status.is-err { color: var(--danger); }
.form input.is-invalid, .form textarea.is-invalid { border-color: var(--danger); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 2rem 0; font-size: .92rem; }
.footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1.2rem; }
.footer__links { display: flex; gap: 1.2rem; }
.footer__links a { color: var(--text-muted); }
.footer__links a:hover { color: var(--text); }

/* ---------- motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

/* ---------- quieter service, expertise and experience sections ---------- */
.services-intro { font-size: clamp(1.2rem, 2.2vw, 1.55rem); color: var(--text); line-height: 1.45; }
.feature__photo { width: 100%; height: 250px; object-fit: cover; border-radius: var(--radius-sm); margin-bottom: 1rem; }
.feature__photo--stator { object-fit: contain; background: #0b1220; }
.feature > .btn { margin-top: auto; }
.experience-table { width: 100%; table-layout: fixed; border-collapse: collapse; text-align: left; }
.experience-table th { padding: 1rem 0; border-block: 1px solid var(--line-strong); font-size: 1.1rem; font-weight: 600; }
.experience-table td { vertical-align: top; padding: 1rem 0; border-bottom: 1px solid var(--line-strong); }
.experience-table th + th, .experience-table td + td { padding-left: 2rem; border-left: 1px solid var(--line-strong); }
.experience-table ul { list-style: none; padding: 0; margin: 0; }
.experience-table button { border: 0; background: none; padding: .4rem 0; text-align: left; color: var(--text-muted); cursor: pointer; }
.experience-table button:hover, .experience-table button:focus-visible { color: var(--accent-2); text-decoration: underline; text-underline-offset: .25em; }
.case__main img { object-fit: contain; }
.case__body p { color: var(--text-muted); line-height: 1.75; }
.case__specs { color: var(--text-muted); padding-left: 1.2rem; margin: 0 0 1.5rem; }
.case__specs li { margin-bottom: .35rem; }
@media (max-width: 600px) {
 .feature { padding: 1.3rem; }
 .feature__photo { height: 210px; }
 .experience-table th { font-size: 1rem; }
 .experience-table th + th, .experience-table td + td { padding-left: 1rem; }
}

/* Engineering desk — selected site design. */
/* Keep viewport scrolling enabled; clipping belongs on individual image frames. */
.engineering-desk { position:relative; isolation:isolate; --accent:#f4a044; --accent-2:#f4a044; }
.engineering-desk .nav { position:relative; top:auto; background:#0b192d; color:#fff; border-bottom:1px solid #364253; }
.engineering-desk .brand { color:white; }
.engineering-desk .nav__links a { color:white; }
.engineering-desk .nav__links .btn { color:#10223a; }
.engineering-desk .hero { border:0; }
.engineering-desk .hero__title { text-wrap:balance; }
.engineering-desk .card--link::after { display:none; }
.engineering-desk .card h3 { margin-bottom:0; }
.engineering-desk .experience { border:0; }
.engineering-desk .process-plate { grid-template-columns:repeat(3,minmax(0,1fr)); }
.engineering-desk .process-plate figure { overflow:hidden; }
.engineering-desk .feature__photo { border-radius:0; }
.engineering-desk .form input,.engineering-desk .form textarea { color:inherit; }
.engineering-desk .btn:focus-visible,.engineering-desk button:focus-visible,.engineering-desk a:focus-visible { outline:2px solid #e99132; outline-offset:4px; }
.engineering-desk { --text:#f4f7fc; --text-muted:#b4c2d7; background:#091421; }
.engineering-desk .wrap { width:min(1200px,100% - 3rem); }
.engineering-desk .hero { background:#111f32; padding:5rem 0; border-bottom:1px solid #47607b; }
.engineering-desk .concept__inner { grid-template-columns:1.15fr 1fr; align-items:center; gap:3rem; }
.engineering-desk .hero__title { font-size:clamp(2.6rem,4.5vw,4.3rem); line-height:1.04; letter-spacing:-.045em; }
.engineering-desk .hero__title .accent { display:block; }
.engineering-desk .process-plate { gap:.6rem; padding:1rem; border:1px solid #47607b; background:#0b1625; }
.engineering-desk .process-plate img { aspect-ratio:.55; }
.engineering-desk .btn,.engineering-desk .form,.engineering-desk .card,.engineering-desk .feature,.engineering-desk .case__main,.engineering-desk .thumb { border-radius:3px; }
.engineering-desk .eyebrow { padding-left:1rem; border-left:3px solid #f4a044; font-family:var(--mono); }
.engineering-desk .section { padding:4rem 0; }
.engineering-desk .section--alt { background:#111f32; }
.engineering-desk .grid--3 { gap:1px; background:#3d5069; border:1px solid #3d5069; }
.engineering-desk .card { border:0; background:#14263b; padding:2rem; min-height:145px; }
.engineering-desk .card__icon { border:0; padding:0; font-size:1.8rem; }
.engineering-desk .card h3 { font-size:1.1rem; margin-top:1rem; }
.engineering-desk .feature { padding:1rem; border:1px solid #3d5069; background:#091421; }
.engineering-desk .feature h3,.engineering-desk .feature p { margin-inline:.5rem; }
.engineering-desk .feature .btn { margin:.5rem; }
.engineering-desk .feature__photo { height:270px; }
.engineering-desk .experience-table th { color:#f4a044; font:1rem var(--mono); }
.engineering-desk .experience-table td { padding-block:1.5rem; }
.engineering-desk .form { background:#0a1728; border-color:#47607b; }
.engineering-desk .contact__ways { border-left:3px solid #f4a044; }
@media(max-width:900px) {
 .engineering-desk .concept__inner { grid-template-columns:1fr; }
 .engineering-desk .process-plate img { aspect-ratio:1.6; }
}
@media(max-width:600px) {
 .engineering-desk .wrap { width:calc(100% - 2.5rem); }
 .engineering-desk .hero { padding-top:3rem; }
 .engineering-desk .hero__title { font-size:clamp(2.3rem,9vw,3.4rem); }
 .engineering-desk .section { padding:3rem 0; }
 .engineering-desk .services-intro { font-size:1.6rem; }
 .engineering-desk .process-plate { gap:.4rem; }
 .engineering-desk .process-plate img { aspect-ratio:1; }
 .engineering-desk .feature__photo { height:230px; }
 .engineering-desk .case__body { padding:1.25rem 0 0; border:0; }
 .engineering-desk .form { padding:1.2rem; }
 .engineering-desk .grid--3 { grid-template-columns:repeat(2,minmax(0,1fr)); }
 .engineering-desk .card { padding:1.1rem; min-height:120px; }
 .engineering-desk .card h3 { font-size:1rem; overflow-wrap:anywhere; }
}
.engineering-desk .nav__toggle span { background:#fff; }
.engineering-desk .nav__mobile a { color:#fff; }