/* ==========================================================================
   PVHTC — Engineering Blueprint design system
   Palette: steel #16212e · paper #f7f4ef · copper #d9742b · process #4a90c4
   ========================================================================== */

@font-face {
  font-family: 'Fraunces';
  src: url('../assets/fonts/fraunces-var.woff2') format('woff2');
  font-weight: 600 700;
  font-display: swap;
}
@font-face {
  font-family: 'Archivo';
  src: url('../assets/fonts/archivo-var.woff2') format('woff2');
  font-weight: 400 700;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('../assets/fonts/jetbrains-mono-var.woff2') format('woff2');
  font-weight: 400 600;
  font-display: swap;
}

:root {
  --steel: #16212e;
  --steel-2: #1d2c3d;
  --steel-3: #243648;
  --paper: #f7f4ef;
  --paper-2: #efeae1;
  --copper: #d9742b;
  --copper-btn: #b35a15;
  --copper-btn-hov: #a85412;
  --copper-bright: #e8842f;
  --copper-hot: #e25822;
  --process: #4a90c4;
  --process-deep: #2e6e9e;
  --teal: #4fb3a9;
  --ink: #232a33;
  --ink-soft: #4d5763;
  --cloud: #e9eef4;
  --cloud-dim: #aebdcc;
  --line-dark: rgba(233, 238, 244, 0.14);
  --line-light: rgba(35, 42, 51, 0.14);
  --serif: 'Fraunces', Georgia, serif;
  --sans: 'Archivo', -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
  --max: 1120px;
  --rad: 6px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--sans);
  font-size: 17.5px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--process-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--copper); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--copper); color: #fff; padding: .6rem 1rem; font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ---------- type ---------- */
h1, h2, h3 { font-family: var(--serif); font-weight: 650; line-height: 1.12; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.3rem, 5.4vw, 3.9rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
h3, .h3-size { font-size: 1.25rem; line-height: 1.3; }

.eyebrow {
  font-family: var(--mono);
  font-size: .76rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: #a8500f;
  display: block;
  margin-bottom: 1.1rem;
}
.dark .eyebrow { color: var(--copper-bright); }

.lede { font-size: 1.16rem; color: var(--ink-soft); max-width: 46em; }
.dark .lede { color: var(--cloud-dim); }

.mono { font-family: var(--mono); }

/* ---------- layout ---------- */
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2rem); }

section { padding: clamp(3.2rem, 7vw, 5.5rem) 0; }

.dark {
  background-color: var(--steel);
  color: var(--cloud);
  background-image:
    linear-gradient(rgba(233,238,244,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233,238,244,.035) 1px, transparent 1px);
  background-size: 48px 48px;
}
.dark h1, .dark h2, .dark h3 { color: #fdfcf9; }
.dark a { color: #8fc1e3; }
.dark a:hover { color: var(--copper-bright); }

.section-head { margin-bottom: clamp(1.8rem, 4vw, 2.8rem); max-width: 50em; }
.section-head p { margin-top: .8rem; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(22, 33, 46, .92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-dark);
}
.site-header .wrap {
  display: flex; align-items: center; gap: 1.4rem;
  height: 66px;
}
.brand {
  display: flex; align-items: center; gap: .7rem;
  text-decoration: none; color: var(--cloud); margin-right: auto;
}
.brand:hover { color: #fff; }
.brand svg { width: 36px; height: 36px; flex: none; }
.brand-name { font-family: var(--mono); font-weight: 600; font-size: 1.02rem; letter-spacing: .06em; }
.brand-sub { display: block; font-family: var(--mono); font-size: .6rem; letter-spacing: .1em; color: var(--cloud-dim); text-transform: uppercase; }

.site-nav { display: flex; gap: 1.5rem; align-items: center; }
.site-nav a {
  color: var(--cloud-dim); text-decoration: none;
  font-size: .92rem; font-weight: 500; letter-spacing: .02em;
  padding: .3rem 0; border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: #fff; }
.site-nav a[aria-current="page"] { color: #fff; border-bottom-color: var(--copper); }

.header-cta {
  font-family: var(--mono); font-size: .8rem !important;
  color: #fff !important; background: var(--copper-btn);
  padding: .5rem .9rem !important; border-radius: var(--rad);
  border-bottom: none !important;
}
.header-cta:hover { background: var(--copper-btn-hov); }

.nav-toggle {
  display: none; background: none; border: 1px solid var(--line-dark);
  border-radius: var(--rad); color: var(--cloud); padding: .45rem .6rem; cursor: pointer;
}

@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none; position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--steel-2); border-bottom: 1px solid var(--line-dark);
    padding: .6rem 1.2rem 1.2rem;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: .7rem 0; font-size: 1.05rem; width: 100%; }
  .header-cta { margin-top: .6rem; text-align: center; }
}

/* ---------- hero ---------- */
.hero { padding: clamp(3.4rem, 8vw, 6rem) 0 0; overflow: hidden; }
.hero h1 { max-width: 12.5em; }
.hero .lede { margin-top: 1.3rem; }
.hero-creds {
  margin-top: 1.5rem; font-family: var(--mono); font-size: .8rem;
  letter-spacing: .04em; color: var(--cloud-dim);
  display: flex; flex-wrap: wrap; gap: .45rem 1.1rem;
}
.hero-creds span::before { content: '▸ '; color: var(--copper); }
.hero-actions { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.hero-hook { margin-top: 1rem; font-size: .95rem; color: var(--cloud-dim); font-style: italic; }
.hero-diagram { margin-top: clamp(2.5rem, 6vw, 4rem); }

/* ---------- buttons ---------- */
.btn {
  display: inline-block; text-decoration: none; font-weight: 600;
  font-size: 1.02rem; padding: .85rem 1.6rem; border-radius: var(--rad);
  transition: transform .15s ease, background .15s ease;
}
.btn-primary { background: var(--copper-btn); color: #fff !important; }
.btn-primary:hover { background: var(--copper-btn-hov); transform: translateY(-1px); }
.btn-ghost { border: 1px solid var(--line-dark); color: var(--cloud) !important; }
.btn-ghost:hover { border-color: var(--copper); color: #fff !important; }
.light-section .btn-ghost { border-color: var(--line-light); color: var(--ink) !important; }

/* ---------- stat band ---------- */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1px; background: var(--line-dark);
  border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark);
}
.stat { background: var(--steel); padding: 1.8rem 1.4rem; text-align: center; }
.stat b {
  display: block; font-family: var(--serif); font-weight: 700;
  font-size: clamp(2rem, 4vw, 2.8rem); color: var(--copper-bright); line-height: 1;
}
.stat span {
  display: block; margin-top: .5rem; font-family: var(--mono);
  font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--cloud-dim);
}

/* ---------- cards ---------- */
.card-grid { display: grid; gap: 1.2rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card {
  background: #fff; border: 1px solid var(--line-light); border-radius: var(--rad);
  padding: 1.6rem 1.5rem; position: relative;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 1.5rem; right: auto;
  width: 44px; height: 3px; background: var(--copper);
}
.card h3 { margin-bottom: .6rem; }
.card p { font-size: .98rem; color: var(--ink-soft); }
.card .mono-tag {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--process-deep); display: block; margin-bottom: .8rem;
}

.dark .card { background: var(--steel-2); border-color: var(--line-dark); }
.dark .card p { color: var(--cloud-dim); }
.dark .card .mono-tag { color: #8fc1e3; }

/* ---------- case studies ---------- */
.case-group { margin-bottom: clamp(2.4rem, 5vw, 3.6rem); }
.case-group > h3 {
  font-family: var(--mono); font-weight: 600; font-size: .85rem;
  letter-spacing: .14em; text-transform: uppercase; color: var(--copper);
  border-bottom: 1px solid var(--line-light); padding-bottom: .7rem; margin-bottom: 1.4rem;
}
.dark .case-group > h3 { border-color: var(--line-dark); }
.case {
  display: grid; grid-template-columns: 200px 1fr; gap: 1.5rem;
  padding: 1.4rem 0; border-bottom: 1px dashed var(--line-light);
}
.dark .case { border-color: var(--line-dark); }
.case:last-child { border-bottom: none; }
.case .case-meta { font-family: var(--mono); font-size: .78rem; line-height: 1.6; color: var(--ink-soft); }
.dark .case .case-meta { color: var(--cloud-dim); }
.case .case-meta b { color: var(--ink); font-weight: 600; display: block; }
.dark .case .case-meta b { color: var(--cloud); }
.case h4 { font-family: var(--serif); font-size: 1.15rem; margin-bottom: .4rem; }
.case p, .case li { font-size: .98rem; color: var(--ink-soft); }
.dark .case p, .dark .case li { color: var(--cloud-dim); }
.case ul { padding-left: 1.2rem; margin-top: .4rem; }
@media (max-width: 640px) { .case { grid-template-columns: 1fr; gap: .5rem; } }

/* ---------- diagrams ---------- */
.diagram-frame {
  border: 1px solid var(--line-dark); border-radius: var(--rad);
  background: var(--steel-2); padding: clamp(.8rem, 2.5vw, 1.6rem);
  position: relative;
}
.light-section .diagram-frame { background: var(--steel); }
.diagram-frame svg { width: 100%; height: auto; display: block; }
.diagram-caption {
  font-family: var(--mono); font-size: .78rem; line-height: 1.6;
  color: var(--cloud-dim); margin-top: 1rem; padding-top: .8rem;
  border-top: 1px dashed var(--line-dark);
}
.diagram-caption b { color: var(--copper-bright); font-weight: 600; }

/* diagram text + line styles (SVGs inherit these) */
.dlabel { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; fill: #aebdcc; }
.dlabel-strong { fill: #e9eef4; font-weight: 600; }
.dtitle { font-family: var(--mono); font-size: 10px; letter-spacing: .12em; fill: #6c7f92; }
.dleader { stroke: #51687e; stroke-width: 1; fill: none; }
.dsteel-fill { fill: #243648; stroke: #8aa0b5; stroke-width: 1.6; }
.dsteel-dim { stroke: #51687e; stroke-width: 1.2; fill: none; }

/* flow animations */
.flow-hot, .flow-cold, .flow-hot2, .flow-cold2 {
  fill: none; stroke-width: 3; stroke-linecap: round;
  stroke-dasharray: 10 14;
}
.flow-hot { stroke: url(#gradHot); }
.flow-cold { stroke: url(#gradCold); }
.flow-hot2 { stroke: url(#gradHot2); }
.flow-cold2 { stroke: url(#gradCold2); }
.anim-flow { animation: flowdash 6s linear infinite; }
.anim-flow-slow { animation: flowdash 8s linear infinite; }
@keyframes flowdash { to { stroke-dashoffset: -240; } }

.anim-vibrate { animation: vibrate 1.1s ease-in-out infinite; }
@keyframes vibrate {
  0%, 100% { transform: translateY(0); }
  25% { transform: translateY(-1.6px); }
  75% { transform: translateY(1.6px); }
}
.anim-pulse { animation: pulse 4s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: .25; } 50% { opacity: .9; } }

@media (prefers-reduced-motion: reduce) {
  .anim-flow, .anim-flow-slow, .anim-vibrate, .anim-pulse { animation: none; }
  .anim-pulse { opacity: .6; }
}

/* ---------- photos ---------- */
.photo-duo {
  position: relative; border-radius: var(--rad); overflow: hidden;
  border: 1px solid var(--line-light);
}
.dark .photo-duo { border-color: var(--line-dark); }
.photo-duo img { width: 100%; height: auto; filter: grayscale(.85) sepia(.18) contrast(1.04) brightness(.96); }
.photo-duo::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(74,144,196,.30), rgba(22,33,46,.38) 55%, rgba(217,116,43,.22));
  mix-blend-mode: overlay; pointer-events: none;
}
.photo-caption {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .04em;
  color: var(--ink-soft); margin-top: .6rem; line-height: 1.55;
}
.dark .photo-caption { color: var(--cloud-dim); }
.photo-grid { display: grid; gap: 1.4rem; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); align-items: start; }

/* ---------- lists ---------- */
.spec-list { list-style: none; display: grid; gap: .55rem; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.spec-list li { padding-left: 1.4rem; position: relative; font-size: 1rem; }
.spec-list li::before {
  content: '—'; position: absolute; left: 0; color: var(--copper); font-weight: 700;
}

.client-strip {
  font-family: var(--mono); font-size: .92rem; letter-spacing: .05em; line-height: 2.2;
  color: var(--cloud-dim); text-align: center; max-width: 52em; margin: 0 auto;
}
.client-strip b { color: var(--cloud); font-weight: 500; white-space: nowrap; }
.client-strip b::after { content: ' ·'; color: var(--copper); }
.client-strip b:last-of-type::after { content: ''; }

/* ---------- timeline (about) ---------- */
.timeline { list-style: none; border-left: 2px solid var(--line-light); padding-left: 1.6rem; max-width: 44em; }
.timeline li { padding: .9rem 0; position: relative; }
.timeline li::before {
  content: ''; position: absolute; left: calc(-1.6rem - 6px); top: 1.45rem;
  width: 10px; height: 10px; border-radius: 50%; background: var(--copper); border: 2px solid var(--paper);
}
.timeline b { display: block; font-weight: 600; }
.timeline .role { font-family: var(--mono); font-size: .76rem; letter-spacing: .08em; text-transform: uppercase; color: var(--process-deep); }
.timeline p { font-size: .95rem; color: var(--ink-soft); margin-top: .2rem; }

/* ---------- contact ---------- */
.contact-grid { display: grid; gap: 2.5rem; grid-template-columns: 1.1fr .9fr; align-items: start; }
@media (max-width: 760px) { .contact-grid { grid-template-columns: 1fr; } }

.contact-card {
  background: var(--steel-2); border: 1px solid var(--line-dark);
  border-radius: var(--rad); padding: 1.8rem;
}
.contact-card .h3-size { margin-bottom: 1rem; }
.contact-line { display: flex; gap: .8rem; padding: .65rem 0; border-bottom: 1px dashed var(--line-dark); align-items: baseline; }
.contact-line:last-child { border-bottom: none; }
.contact-line .k { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--cloud-dim); width: 86px; flex: none; }
.contact-line .v { font-size: 1.02rem; }
.contact-line .v small { display: block; font-size: .8rem; color: var(--cloud-dim); }

form .field { margin-bottom: 1.1rem; }
form label { display: block; font-family: var(--mono); font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--cloud-dim); margin-bottom: .4rem; }
form input, form textarea {
  width: 100%; background: var(--steel-3); color: var(--cloud);
  border: 1px solid var(--line-dark); border-radius: var(--rad);
  padding: .8rem .9rem; font: inherit; font-size: 1rem;
}
form input:focus, form textarea:focus { outline: 2px solid var(--process); border-color: transparent; }
form button {
  font: inherit; font-weight: 600; cursor: pointer; border: none;
  background: var(--copper-btn); color: #fff; padding: .9rem 1.8rem; border-radius: var(--rad);
}
form button:hover { background: var(--copper-btn-hov); }
.form-note { font-size: .88rem; color: var(--cloud-dim); margin-top: .8rem; }
.hp-field { position: absolute; left: -9999px; }

/* ---------- footer ---------- */
.site-footer { background: var(--steel); color: var(--cloud-dim); border-top: 1px solid var(--line-dark); padding: 3rem 0 2.2rem; font-size: .92rem; }
.footer-grid { display: grid; gap: 2rem; grid-template-columns: 2fr 1fr 1fr; }
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer .ft-h { font-family: var(--mono); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--cloud); margin-bottom: .8rem; }
.site-footer a { color: var(--cloud-dim); }
.site-footer a:hover { color: var(--copper-bright); }
.site-footer ul { list-style: none; }
.site-footer li { padding: .2rem 0; }
.footer-legal { margin-top: 2.4rem; padding-top: 1.2rem; border-top: 1px solid var(--line-dark); font-family: var(--mono); font-size: .72rem; letter-spacing: .05em; display: flex; flex-wrap: wrap; gap: .5rem 2rem; justify-content: space-between; }

/* ---------- CTA band ---------- */
.cta-band { text-align: center; }
.cta-band h2 { max-width: 22em; margin: 0 auto; }
.cta-band p { max-width: 38em; margin: 1rem auto 0; }
.cta-band .hero-actions { justify-content: center; }

/* ---------- scroll reveals ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .55s ease, transform .55s ease; }
.reveal.in { opacity: 1; transform: none; }
.reveal-d1 { transition-delay: .08s; }
.reveal-d2 { transition-delay: .16s; }
.reveal-d3 { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}
.no-js .reveal { opacity: 1; transform: none; }