/* ============================================================
   A1 Prefab — PPVC website
   Global stylesheet
   ------------------------------------------------------------
   BRAND PALETTE: edit the variables in :root below to re-skin
   the whole site in one place.
   ============================================================ */

:root {
  /* --- A1 Prefab brand palette (edit these) --- */
  --primary:        #16263F;   /* Ink Navy — primary         */
  --primary-dark:   #0e1a2c;   /* darker navy (hovers/nav)   */
  --primary-light:  #28415f;   /* lighter navy (gradients)   */
  --accent:         #C2792F;   /* Ochre — the "1", highlights*/
  --accent-dark:    #a9661f;   /* darker ochre (hovers)      */
  --signal:         #C5312B;   /* Signal Red — use sparingly */
  --charcoal:       #201E1A;   /* Charcoal — deep neutral    */
  --ink:            #16263F;   /* headings (Ink Navy)        */
  --body:           #443f38;   /* body text                  */
  --muted:          #6F6A5E;   /* Stone Grey — secondary     */
  --line:           #e7e1d5;   /* borders / dividers         */
  --bg:             #ffffff;   /* page background            */
  --bg-soft:        #f5f1e8;   /* Concrete-tint soft section */
  --concrete:       #EFE9DD;   /* Concrete — light base      */

  /* --- Layout --- */
  --maxw: 1200px;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 10px 30px rgba(16, 36, 63, 0.08);
  --shadow-lg: 0 24px 60px rgba(16, 36, 63, 0.14);
  --gutter: clamp(20px, 5vw, 48px);

  /* --- Type --- */
  --font: "Inter", "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--body);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.15; font-weight: 800; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.7rem); }
h3 { font-size: 1.25rem; }
p  { color: var(--body); }
ul { padding-left: 0; }

/* ---------- Utilities ---------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(60px, 9vw, 110px); }
.section--soft { background: var(--bg-soft); }
.eyebrow {
  display: inline-block; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 14px;
}
.lead { font-size: 1.18rem; color: var(--muted); max-width: 60ch; }
.center { text-align: center; }
.center .lead { margin-inline: auto; }
.section-head { max-width: 720px; margin-bottom: 52px; }
.section-head.center { margin-inline: auto; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-weight: 700; font-size: 1rem; padding: 14px 26px;
  border-radius: 999px; border: 2px solid transparent; cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--primary); color: #fff; box-shadow: 0 8px 22px rgba(22,38,63,.3); }
.btn--primary:hover { background: var(--primary-dark); }
.btn--ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }
.btn--ghost:hover { background: rgba(255,255,255,.12); }
.btn--outline { background: transparent; color: var(--primary); border-color: var(--line); }
.btn--outline:hover { border-color: var(--primary); background: var(--bg-soft); }
.btn--lg { padding: 17px 34px; font-size: 1.05rem; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.86); backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent; transition: border-color .25s, box-shadow .25s;
}
.site-header.scrolled { border-color: var(--line); box-shadow: 0 4px 24px rgba(16,36,63,.06); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 74px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; color: var(--ink); font-size: 1.22rem; letter-spacing: -.02em; }
.brand .logo-mark {
  width: 40px; height: 40px; flex: none;
  background: url("../images/logo-mark.svg") center/contain no-repeat;
  box-shadow: 0 6px 16px rgba(22,38,63,.28); border-radius: 10px;
}
.site-footer .brand .logo-mark { background-image: url("../images/logo-mark-reversed.svg"); box-shadow: none; }
.brand small { display: block; font-size: .62rem; font-weight: 600; letter-spacing: .22em; color: var(--muted); text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; }
.nav-links a {
  color: var(--body); font-weight: 600; font-size: .98rem; padding: 9px 14px; border-radius: 8px;
  transition: color .15s, background .15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); background: var(--bg-soft); }
.nav-cta { margin-left: 10px; }
.nav-toggle {
  display: none; background: none; border: 0; cursor: pointer; padding: 8px;
  width: 44px; height: 44px;
}
.nav-toggle span { display: block; width: 24px; height: 2.5px; background: var(--ink); border-radius: 2px; transition: .3s; }
.nav-toggle span + span { margin-top: 5px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff; isolation: isolate;
  background-color: var(--primary-dark);
  background-size: cover; background-position: center; background-repeat: no-repeat;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(115deg, rgba(14,22,38,.94) 0%, rgba(22,38,63,.82) 45%, rgba(22,38,63,.5) 100%);
}
.hero__inner { padding-block: clamp(80px, 13vw, 160px); max-width: 760px; position: relative; z-index: 2; }
.hero h1 { color: #fff; margin-bottom: 22px; }
.hero p { color: rgba(255,255,255,.9); font-size: 1.2rem; max-width: 56ch; margin-bottom: 34px; }
.hero .btn-row { display: flex; gap: 14px; flex-wrap: wrap; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 9px; font-weight: 600; font-size: .85rem;
  background: rgba(255,255,255,.13); border: 1px solid rgba(255,255,255,.25);
  padding: 7px 15px; border-radius: 999px; margin-bottom: 26px; letter-spacing: .02em;
}
.hero__badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(194,121,47,.3); }

/* ---------- Intro video ---------- */
.video-frame {
  max-width: 960px; margin-inline: auto; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow-lg); border: 1px solid var(--line); background: var(--primary-dark);
  line-height: 0;
}
.video-frame video { display: block; width: 100%; height: auto; }

/* ---------- Stats strip ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat { text-align: center; }
.stat .num { font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 900; color: var(--accent); letter-spacing: -.03em; }
.stat .label { color: var(--muted); font-weight: 600; font-size: .95rem; }

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 26px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; transition: transform .25s, box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: transparent; }
.card .icon {
  width: 52px; height: 52px; border-radius: 13px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(22,38,63,.08), rgba(194,121,47,.16));
  color: var(--accent); margin-bottom: 18px;
}
.card h3 { margin-bottom: 9px; }
.card p { color: var(--muted); font-size: .98rem; }

/* ---------- Feature split (image + text) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 6vw, 72px); align-items: center; }
.split.reverse .split__media { order: 2; }
.split__media {
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg);
  aspect-ratio: 4/3; background-color: var(--bg-soft); background-position: center; background-size: cover; background-repeat: no-repeat;
  position: relative; border: 1px solid var(--line);
}
.split__media::after { content: attr(data-caption); position: absolute; inset: auto 0 0 0;
  padding: 14px 18px; font-size: .82rem; color: #fff; font-weight: 600;
  background: linear-gradient(transparent, rgba(22,38,63,.82)); }
.split ul.checks { list-style: none; margin-top: 22px; display: grid; gap: 13px; }
.checks li { display: flex; gap: 12px; align-items: flex-start; color: var(--body); }
.checks li svg { flex: none; margin-top: 3px; color: var(--accent); }

/* ---------- Process timeline ---------- */
.steps { counter-reset: step; display: grid; gap: 22px; }
.step {
  display: grid; grid-template-columns: 64px 1fr; gap: 22px; align-items: start;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 28px;
  transition: box-shadow .25s, transform .25s;
}
.step:hover { box-shadow: var(--shadow); transform: translateX(4px); }
.step .n {
  counter-increment: step; width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark)); color: #fff;
  display: grid; place-items: center; font-weight: 900; font-size: 1.4rem;
  box-shadow: 0 8px 18px rgba(194,121,47,.32);
}
.step .n::before { content: counter(step, decimal-leading-zero); }
.step h3 { margin-bottom: 6px; }
.step p { color: var(--muted); font-size: .98rem; }

/* ---------- Project cards ---------- */
.project {
  border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: #fff;
  transition: transform .25s, box-shadow .25s; display: flex; flex-direction: column;
}
.project:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.project__img {
  aspect-ratio: 16/10; background-color: var(--bg-soft); background-position: center; background-size: cover; background-repeat: no-repeat;
  position: relative;
}
.project__tag {
  position: absolute; top: 14px; left: 14px; background: rgba(22,38,63,.85); color: #fff;
  font-size: .74rem; font-weight: 700; letter-spacing: .04em; padding: 6px 12px; border-radius: 999px;
  text-transform: uppercase;
}
.project__body { padding: 24px 26px 28px; flex: 1; display: flex; flex-direction: column; }
.project__body h3 { margin-bottom: 7px; }
.project__meta { color: var(--primary); font-weight: 700; font-size: .85rem; margin-bottom: 10px; letter-spacing: .03em; }
.project__body p { color: var(--muted); font-size: .96rem; }

/* ---------- System cards ---------- */
.system { display: flex; flex-direction: column; }
.system .checks { margin: 16px 0 0; }
.system .checks li { font-size: .94rem; }
.system .sys-metrics { display: flex; flex-wrap: wrap; gap: 12px 22px; margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line); }
.system .sys-metrics div { font-size: .76rem; color: var(--muted); line-height: 1.3; }
.system .sys-metrics b { display: block; font-size: 1.3rem; color: var(--accent); font-weight: 900; letter-spacing: -.02em; }
.system .best { margin-top: auto; padding-top: 18px; font-size: .9rem; color: var(--muted); }
.system .best strong { color: var(--ink); }

/* ---------- Case studies ---------- */
.cases { display: grid; gap: 30px; }
.case {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 0;
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: #fff; box-shadow: var(--shadow);
}
.case:nth-child(even) .case__media { order: 2; }
.case__media { background-color: var(--bg-soft); background-position: center; background-size: cover; background-repeat: no-repeat; min-height: 360px; position: relative; }
.case__badge {
  position: absolute; top: 16px; left: 16px; background: rgba(22,38,63,.85); color: #fff;
  font-size: .73rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  padding: 6px 12px; border-radius: 999px;
}
.case__content { padding: clamp(26px, 3.5vw, 42px); }
.case__content h3 { font-size: 1.5rem; }
.case__loc { color: var(--accent); font-weight: 700; font-size: .9rem; margin: 6px 0 16px; }
.case__content > p { color: var(--muted); font-size: .96rem; }
.case__facts { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 0 26px; margin: 22px 0 0; }
.case__facts li { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: .9rem; }
.case__facts li span:first-child { color: var(--muted); }
.case__facts li span:last-child { color: var(--ink); font-weight: 700; text-align: right; }
.case__awards { margin-top: 18px; font-size: .87rem; color: var(--muted); }
.case__awards strong { color: var(--ink); }
@media (max-width: 820px) {
  .case { grid-template-columns: 1fr; }
  .case:nth-child(even) .case__media { order: 0; }
  .case__media { min-height: 240px; }
  .case__facts { grid-template-columns: 1fr; }
}

/* ---------- Model cards ---------- */
.model { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; transition: box-shadow .25s, transform .25s; }
.model:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.model__img { aspect-ratio: 16/11; background-color: var(--bg-soft); background-position: center; background-size: cover; background-repeat: no-repeat; }
.model__body { padding: 24px 26px 28px; }
.model__body h3 { margin-bottom: 4px; }
.model__price { color: var(--muted); font-weight: 600; font-size: .9rem; margin-bottom: 16px; }
.specs { list-style: none; display: grid; gap: 0; border-top: 1px solid var(--line); }
.specs li { display: flex; justify-content: space-between; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: .92rem; }
.specs li span:first-child { color: var(--muted); }
.specs li span:last-child { color: var(--ink); font-weight: 700; }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(115deg, var(--primary-dark), var(--primary) 70%, var(--primary-light));
  color: #fff; border-radius: var(--radius); padding: clamp(40px, 6vw, 70px); text-align: center;
  box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
}
.cta-band::before { content:""; position:absolute; inset:0; background:
  radial-gradient(circle at 15% 20%, rgba(255,255,255,.1), transparent 40%),
  radial-gradient(circle at 85% 90%, rgba(194,121,47,.4), transparent 48%); }
.cta-band > * { position: relative; }
.cta-band h2 { color: #fff; margin-bottom: 14px; }
.cta-band p { color: rgba(255,255,255,.88); max-width: 56ch; margin: 0 auto 28px; font-size: 1.12rem; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: clamp(32px, 5vw, 64px); align-items: start; }
.contact-info { display: grid; gap: 22px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-item .ci-icon {
  width: 46px; height: 46px; flex: none; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(22,38,63,.08), rgba(194,121,47,.16)); color: var(--accent);
}
.contact-item h4 { color: var(--ink); font-size: 1rem; margin-bottom: 2px; }
.contact-item p, .contact-item a { color: var(--muted); font-size: .98rem; }
.contact-item a:hover { color: var(--primary); }

.form { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(26px, 4vw, 40px); box-shadow: var(--shadow); }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; color: var(--ink); margin-bottom: 7px; font-size: .92rem; }
.field input, .field select, .field textarea {
  width: 100%; padding: 13px 15px; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  font: inherit; font-size: .98rem; color: var(--ink); background: var(--bg-soft); transition: border-color .15s, background .15s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--primary); background: #fff; }
.field textarea { resize: vertical; min-height: 120px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form .btn { width: 100%; justify-content: center; }
.form-note { font-size: .85rem; color: var(--muted); margin-top: 14px; text-align: center; }
.form-success { display: none; background: rgba(194,121,47,.1); border: 1px solid var(--accent); color: var(--ink); padding: 14px 16px; border-radius: var(--radius-sm); margin-bottom: 18px; font-weight: 600; }
.form-success.show { display: block; }

/* ---------- Page hero (interior pages) ---------- */
.page-hero {
  background: linear-gradient(115deg, var(--primary-dark), var(--primary));
  color: #fff; padding-block: clamp(60px, 9vw, 110px); position: relative; overflow: hidden;
}
.page-hero::after { content:""; position:absolute; inset:0; background:
  radial-gradient(circle at 80% 0%, rgba(194,121,47,.32), transparent 48%); }
.page-hero > .container { position: relative; }
.page-hero h1 { color: #fff; margin-bottom: 14px; }
.page-hero p { color: rgba(255,255,255,.88); max-width: 60ch; font-size: 1.15rem; }
.crumbs { font-size: .85rem; color: rgba(255,255,255,.7); margin-bottom: 16px; }
.crumbs a { color: rgba(255,255,255,.85); }
.crumbs a:hover { color: #fff; }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin-inline: auto; display: grid; gap: 14px; }
.faq details { border: 1px solid var(--line); border-radius: var(--radius-sm); background: #fff; padding: 0 22px; }
.faq summary { cursor: pointer; font-weight: 700; color: var(--ink); padding: 18px 0; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.4rem; color: var(--primary); font-weight: 400; transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--muted); padding-bottom: 20px; font-size: .98rem; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: rgba(255,255,255,.7); padding-block: 56px 28px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 40px; }
.site-footer .brand { color: #fff; margin-bottom: 16px; }
.site-footer .brand small { color: rgba(255,255,255,.5); }
.site-footer p { color: rgba(255,255,255,.6); font-size: .95rem; max-width: 32ch; }
.footer-col h4 { color: #fff; font-size: .95rem; margin-bottom: 16px; letter-spacing: .03em; }
.footer-col ul { list-style: none; display: grid; gap: 10px; }
.footer-col a { color: rgba(255,255,255,.65); font-size: .94rem; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding-top: 22px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: .85rem; color: rgba(255,255,255,.5); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 1000px) {
  .nav-links {
    position: fixed; inset: 74px 0 auto 0; flex-direction: column; align-items: stretch;
    background: #fff; border-bottom: 1px solid var(--line); padding: 14px var(--gutter) 22px;
    gap: 4px; transform: translateY(-130%); transition: transform .3s ease; box-shadow: var(--shadow);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 13px 14px; }
  .nav-cta { margin: 8px 0 0; }
  .nav-toggle { display: block; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }
}
@media (max-width: 820px) {
  .grid--3, .grid--2, .grid--4, .stats { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2,1fr); gap: 30px; }
  .split, .contact-grid { grid-template-columns: 1fr; }
  .split.reverse .split__media { order: 0; }
  .field-row { grid-template-columns: 1fr; }
}