/* Ductvia — site styles
   Anchor colour: RAL 5022 Night Blue (#252850). Industrial / engineering-drawing language. */

:root {
  --navy-950: #0b0d20;
  --navy-900: #11132b;
  --navy-800: #191c3c;
  --navy: #252850;          /* RAL 5022 */
  --navy-600: #363b7a;
  --blue: #4f5fd6;
  --blue-300: #9fb0ff;
  --steel: #b9c0cc;
  --steel-600: #7b8494;
  --paper: #f3f4f1;
  --paper-2: #e8eae4;
  --ink: #14162b;
  --ink-2: #4a4f63;
  --amber: #f2a516;
  --amber-600: #d68b00;
  --line-dark: rgba(255,255,255,.10);
  --line-light: rgba(20,22,43,.12);

  --f-display: "Poppins", "Helvetica Neue", Arial, sans-serif;
  --f-body: "Poppins", "Helvetica Neue", Arial, sans-serif;
  --f-mono: "Poppins", "Helvetica Neue", Arial, sans-serif;

  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --r: 14px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  background: var(--navy-900);
  color: #e9ebf5;
  font: 400 16px/1.7 var(--f-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
h1, h2, h3, h4 { font-family: var(--f-display); margin: 0; letter-spacing: -0.015em; font-weight: 500; }
p { margin: 0 0 1em; }
.mono { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }

.skip { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--amber); color: var(--ink); padding: 8px 14px; border-radius: 8px; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 4px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 22px; border-radius: 999px; border: 1px solid transparent;
  font: 500 15px/1 var(--f-body); text-decoration: none; cursor: pointer;
  transition: transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--accent { background: var(--amber); color: var(--ink); }
.btn--accent:hover { background: #ffb935; }
.btn--ghost { border-color: rgba(255,255,255,.28); color: #fff; }
.btn--ghost:hover { border-color: #fff; }
.btn--sm { padding: 10px 16px; font-size: 14px; }
.btn--block { width: 100%; }

/* ---------- Eyebrow ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font: 500 12px/1 var(--f-mono); letter-spacing: .16em; text-transform: uppercase;
  color: var(--blue-300); margin: 0 0 18px;
}
.eyebrow--dark { color: var(--navy-600); }
.pulse { width: 8px; height: 8px; border-radius: 50%; background: #3ddc84; box-shadow: 0 0 0 0 rgba(61,220,132,.6); animation: pulse 2s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 10px rgba(61,220,132,0); } 100% { box-shadow: 0 0 0 0 rgba(61,220,132,0); } }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(17,19,43,.78);
  backdrop-filter: saturate(160%) blur(16px); -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--line-dark);
}
.nav__inner { max-width: var(--wrap); margin-inline: auto; padding: 0 var(--gutter); height: 72px; display: flex; align-items: center; gap: 28px; }
.nav__brand img { width: 170px; height: auto; }
.nav__links { display: flex; gap: 4px; margin-inline-start: auto; }
.nav__links a { padding: 8px 12px; border-radius: 8px; text-decoration: none; font-size: 15px; color: #c9cde0; transition: color .2s, background .2s; }
.nav__links a:hover { color: #fff; background: rgba(255,255,255,.06); }
.nav__actions { display: flex; align-items: center; gap: 12px; }
.lang { display: inline-flex; border: 1px solid var(--line-dark); border-radius: 999px; padding: 3px; }
.lang button { background: none; border: 0; color: #aab0c8; font: 500 12px/1 var(--f-mono); padding: 7px 10px; border-radius: 999px; cursor: pointer; }
.lang button[aria-pressed="true"] { background: #fff; color: var(--ink); }
.nav__toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line-dark); border-radius: 10px; background: none; cursor: pointer; padding: 11px 10px; flex-direction: column; justify-content: space-between; }
.nav__toggle span { display: block; height: 2px; background: #fff; border-radius: 2px; transition: transform .25s, opacity .25s; }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden; isolation: isolate;
  padding: clamp(56px, 9vw, 120px) 0 56px;
  background:
    radial-gradient(1100px 600px at 85% 10%, rgba(79,95,214,.30), transparent 60%),
    radial-gradient(800px 500px at 0% 100%, rgba(37,40,80,.9), transparent 70%),
    linear-gradient(180deg, var(--navy-900), var(--navy-950));
}
.hero::before { /* engineering grid */
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(rgba(159,176,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(159,176,255,.07) 1px, transparent 1px),
    linear-gradient(rgba(159,176,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(159,176,255,.035) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  mask-image: linear-gradient(180deg, #000 30%, transparent 95%);
}
.hero__flow { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; opacity: .9; }
.flow { stroke-dasharray: 220 1400; animation: flow 9s linear infinite; }
.f2 { animation-delay: -2.2s; } .f3 { animation-delay: -4.4s; } .f4 { animation-delay: -6.6s; }
@keyframes flow { from { stroke-dashoffset: 1620; } to { stroke-dashoffset: 0; } }

.hero__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero__title {
  font-size: clamp(38px, 5.6vw, 72px); line-height: 1.05; font-weight: 600; letter-spacing: -0.03em; margin-bottom: 26px;
  text-wrap: balance;
}
.hero__sub { font-size: clamp(17px, 1.5vw, 19px); color: #c6cbe0; max-width: 58ch; margin-bottom: 32px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 28px; }
.hero__badge { font: 400 13px/1 var(--f-mono); color: var(--steel-600); letter-spacing: .08em; text-transform: uppercase; }

/* HMI panel */
.hmi {
  margin: 0; position: relative;
  background: linear-gradient(180deg, #1b1f45, #13163a);
  border: 1px solid rgba(159,176,255,.22); border-radius: 18px;
  box-shadow: 0 40px 80px -30px rgba(0,0,0,.7), inset 0 1px 0 rgba(255,255,255,.06);
  padding: 18px; transform: perspective(1400px) rotateY(-6deg) rotateX(2deg);
}
.hmi__bar { display: flex; align-items: center; gap: 10px; font-size: 11px; letter-spacing: .12em; color: #8f97bd; padding: 2px 4px 14px; border-bottom: 1px solid var(--line-dark); }
.hmi__dot { width: 8px; height: 8px; border-radius: 50%; background: #3ddc84; }
.hmi__live { margin-inline-start: auto; color: #3ddc84; }
.hmi__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line-dark); margin: 14px 0; border-radius: 10px; overflow: hidden; }
.hmi__cell { background: #161a3f; padding: 16px; display: flex; flex-direction: column; gap: 6px; }
.hmi__label { font-size: 12px; color: #8f97bd; text-transform: uppercase; letter-spacing: .08em; }
.hmi__val { font-size: clamp(26px, 2.6vw, 34px); font-weight: 500; color: #fff; line-height: 1; }
.hmi__val small { font-size: 13px; color: #8f97bd; font-weight: 400; }
.hmi__chart { display: flex; align-items: flex-end; gap: 6px; height: 92px; padding: 10px 6px 0; border-top: 1px dashed var(--line-dark); }
.hmi__chart span { flex: 1; height: var(--h); border-radius: 3px 3px 0 0; background: linear-gradient(180deg, var(--blue-300), var(--blue)); transform-origin: bottom; animation: grow 1.2s cubic-bezier(.2,.8,.2,1) both; }
.hmi__chart span:last-child { background: linear-gradient(180deg, #ffd27a, var(--amber)); }
.hmi__chart span:nth-child(n) { animation-delay: calc(var(--i, 0) * 60ms); }
@keyframes grow { from { transform: scaleY(0); } }
.hmi__cap { font-size: 11px; color: #6f779c; margin-top: 10px; letter-spacing: .04em; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: clamp(48px, 7vw, 88px); border-top: 1px solid var(--line-dark); }
.stat { padding: 22px 18px 0 0; display: flex; flex-direction: column; gap: 4px; }
.stat + .stat { padding-inline-start: 18px; border-inline-start: 1px solid var(--line-dark); }
.stat b { font-size: clamp(28px, 3.2vw, 40px); font-weight: 500; color: #fff; letter-spacing: -0.02em; }
.stat span { font-size: 14px; color: #9ba2c2; }

/* ---------- Values strip ---------- */
.values { background: var(--amber); color: var(--ink); }
.values__grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.value { padding: 30px 26px 26px 0; }
.value + .value { padding-inline-start: 26px; border-inline-start: 1px solid rgba(20,22,43,.18); }
.value__idx { font-size: 12px; font-weight: 600; opacity: .6; }
.value h3 { font-size: 20px; margin: 6px 0 6px; }
.value p { margin: 0; font-size: 15px; color: #3a3420; }

/* ---------- Sections (light) ---------- */
.section { padding: clamp(72px, 10vw, 128px) 0; }
.products, .process, .about, .faq { background: var(--paper); color: var(--ink); }
.process { background: var(--paper-2); }
.section__head { max-width: 760px; margin-bottom: clamp(36px, 5vw, 60px); }
.section__head h2, .about h2, .reach h2, .contact h2 {
  font-size: clamp(30px, 3.8vw, 48px); line-height: 1.1; font-weight: 600; letter-spacing: -0.025em; margin-bottom: 18px; text-wrap: balance;
}
.lead { font-size: clamp(17px, 1.4vw, 19px); color: var(--ink-2); }
.section__head--light .lead { color: #c6cbe0; }

/* Products */
.families { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.family {
  position: relative; display: grid; grid-template-columns: auto 1fr; gap: 22px;
  background: #fff; border: 1px solid var(--line-light); border-radius: var(--r); padding: clamp(24px, 3vw, 36px);
  transition: transform .3s ease, box-shadow .3s ease;
}
.family:hover { transform: translateY(-3px); box-shadow: 0 24px 50px -30px rgba(20,22,43,.35); }
.family--wide { grid-column: 1 / -1; grid-template-columns: auto 1fr auto; align-items: center; }
.family__num { justify-self: start; font-size: 13px; font-weight: 600; color: var(--blue); border: 1px solid currentColor; border-radius: 6px; padding: 5px 8px; height: max-content; }
.family h3 { font-size: clamp(21px, 2vw, 26px); line-height: 1.15; margin-bottom: 10px; }
.family p { color: var(--ink-2); }
.family__art { width: 300px; color: var(--navy-600); opacity: .55; }
.family--dark { background: var(--navy); color: #fff; border-color: transparent; }
.family--dark p { color: #c6cbe0; }
.family--dark .family__num { color: var(--amber); }
.pills { list-style: none; padding: 0; margin: 4px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.pills li { font: 400 13px/1 var(--f-mono); padding: 8px 11px; border-radius: 999px; background: var(--paper); border: 1px solid var(--line-light); }
.steps4 { list-style: none; padding: 0; margin: 10px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.steps4 li { display: flex; flex-direction: column; gap: 6px; padding: 14px; border: 1px solid rgba(255,255,255,.14); border-radius: 10px; font-weight: 500; }
.steps4 .mono { color: var(--amber); font-size: 12px; }

/* Connect (dark) */
.connect { background: radial-gradient(900px 500px at 10% 0%, rgba(79,95,214,.25), transparent 60%), var(--navy-900); }
.connect__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.panel { border: 1px solid rgba(159,176,255,.2); border-radius: var(--r); padding: 28px; background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.01)); }
.panel__tag { font-size: 11px; letter-spacing: .14em; color: var(--blue-300); margin-bottom: 14px; }
.panel h3 { font-size: 22px; margin-bottom: 14px; }
.panel ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.panel li { padding-inline-start: 22px; position: relative; color: #c6cbe0; font-size: 15px; }
.panel li::before { content: ""; position: absolute; inset-inline-start: 0; top: .62em; width: 10px; height: 2px; background: var(--blue-300); }
.panel--alert li::before { background: var(--amber); }
.connect__note { margin: 28px 0 0; font-size: 14px; color: #8f97bd; max-width: 70ch; }

/* Process timeline */
.timeline { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(7, 1fr); gap: 0; counter-reset: s; }
.timeline li { position: relative; padding: 26px 18px 0 0; border-top: 2px solid var(--navy); }
.timeline li::before { content: ""; position: absolute; top: -7px; inset-inline-start: 0; width: 12px; height: 12px; border-radius: 50%; background: var(--paper-2); border: 2px solid var(--navy); }
.timeline li:last-child::before { background: var(--amber); border-color: var(--amber); }
.timeline .mono { font-size: 12px; color: var(--blue); font-weight: 600; }
.timeline h3 { font-size: 17px; margin: 8px 0 6px; }
.timeline p { font-size: 14px; color: var(--ink-2); margin: 0; }

/* About */
.about__grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(36px, 6vw, 88px); }
.about__copy p:not(.lead):not(.eyebrow) { color: var(--ink-2); }
.principles__head { font-size: 14px; font-family: var(--f-mono); text-transform: uppercase; letter-spacing: .14em; color: var(--navy-600); margin-bottom: 12px; }
.principle { display: grid; grid-template-columns: 44px 1fr; gap: 14px; padding: 22px 0; border-top: 1px solid var(--line-light); }
.principle .mono { color: var(--blue); font-weight: 600; }
.principle h4 { font-size: 19px; margin-bottom: 4px; }
.principle p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* Reach */
.reach { background: linear-gradient(120deg, var(--navy), var(--navy-800)); padding: clamp(64px, 9vw, 112px) 0; position: relative; overflow: hidden; }
.reach::after { content: ""; position: absolute; inset: auto -10% -60% auto; width: 700px; height: 700px; border-radius: 50%; border: 1px solid rgba(159,176,255,.15); box-shadow: 0 0 0 80px rgba(159,176,255,.03), 0 0 0 160px rgba(159,176,255,.02); }
.reach__inner { position: relative; z-index: 1; }
.reach__inner > * { max-width: 900px; }
.regions { list-style: none; padding: 0; margin: 28px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.regions li { padding: 10px 16px; border: 1px solid rgba(255,255,255,.22); border-radius: 999px; font-size: 14px; }

/* FAQ */
.faq__grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(32px, 5vw, 72px); }
.faq__list details { border-top: 1px solid var(--line-light); padding: 4px 0; }
.faq__list details:last-child { border-bottom: 1px solid var(--line-light); }
.faq__list summary { cursor: pointer; list-style: none; padding: 18px 40px 18px 0; position: relative; font: 500 17px/1.4 var(--f-display); }
.faq__list summary::-webkit-details-marker { display: none; }
.faq__list summary::after { content: "+"; position: absolute; inset-inline-end: 4px; top: 14px; font: 400 26px/1 var(--f-mono); color: var(--blue); transition: transform .25s; }
.faq__list details[open] summary::after { transform: rotate(45deg); }
.faq__list p { color: var(--ink-2); padding-inline-end: 40px; }

/* Contact */
.contact { background: radial-gradient(800px 500px at 100% 0%, rgba(242,165,22,.12), transparent 60%), var(--navy-950); }
.contact__grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(32px, 5vw, 72px); align-items: start; }
.contact .lead { color: #c6cbe0; }
.direct { margin: 32px 0 0; display: grid; gap: 0; }
.direct div { display: flex; justify-content: space-between; gap: 16px; padding: 16px 0; border-top: 1px solid var(--line-dark); flex-wrap: wrap; }
.direct dt { color: #8f97bd; font-size: 14px; }
.direct dd { margin: 0; font-family: var(--f-mono); font-size: 15px; }
.direct a { text-decoration: none; border-bottom: 1px solid rgba(255,255,255,.25); }
.direct a:hover { border-color: var(--amber); color: var(--amber); }
.form { background: #fff; color: var(--ink); border-radius: 18px; padding: clamp(22px, 3vw, 36px); display: grid; gap: 16px; box-shadow: 0 40px 80px -40px rgba(0,0,0,.6); }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form label { display: grid; gap: 6px; font-size: 13px; font-weight: 500; color: var(--ink-2); }
.form input, .form select, .form textarea {
  width: 100%; font: 400 15px/1.4 var(--f-body); color: var(--ink);
  padding: 12px 14px; border: 1px solid var(--line-light); border-radius: 10px; background: var(--paper);
  transition: border-color .2s, background .2s;
}
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--blue); background: #fff; }
.form textarea { resize: vertical; }
.form__hint { font-size: 13px; color: var(--steel-600); margin: 0; }
.form__err { font-size: 14px; color: #c62828; margin: 0; }

/* Footer */
.footer { background: var(--navy-950); border-top: 1px solid var(--line-dark); padding: 64px 0 28px; color: #9ba2c2; font-size: 15px; }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer__logo { width: 180px; margin-bottom: 16px; }
.footer h4 { font: 500 12px/1 var(--f-mono); letter-spacing: .16em; text-transform: uppercase; color: #fff; margin-bottom: 16px; }
.footer nav a, .footer div > a { display: block; text-decoration: none; padding: 4px 0; }
.footer a:hover { color: #fff; }
.footer__base { display: flex; justify-content: space-between; gap: 16px; margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line-dark); font-size: 13px; flex-wrap: wrap; }

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.8,.2,1); }
.reveal.is-in { opacity: 1; transform: none; }
.hmi.reveal.is-in { transform: perspective(1400px) rotateY(-6deg) rotateX(2deg); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .timeline { grid-template-columns: repeat(4, 1fr); row-gap: 36px; }
  .family--wide { grid-template-columns: auto 1fr; }
  .family__art { display: none; }
}
@media (max-width: 920px) {
  .nav__links {
    position: fixed; inset: 72px 0 auto 0; flex-direction: column; gap: 0;
    background: var(--navy-900); border-bottom: 1px solid var(--line-dark);
    padding: 8px var(--gutter) 20px; display: none;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { padding: 14px 4px; border-bottom: 1px solid var(--line-dark); border-radius: 0; font-size: 17px; }
  .nav__toggle { display: inline-flex; }
  .nav__cta { display: none; }
  .hero__grid, .about__grid, .faq__grid, .contact__grid { grid-template-columns: 1fr; }
  .hmi { transform: none; max-width: 560px; }
  .hmi.reveal.is-in { transform: none; }
  .connect__grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  body { font-size: 16px; }
  .nav__brand img { width: 140px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { border-inline-start: 0; padding-inline-start: 0; }
  .stat { padding-bottom: 18px; }
  .values__grid { grid-template-columns: 1fr; }
  .value { padding: 22px 0; }
  .value + .value { padding-inline-start: 0; border-inline-start: 0; border-top: 1px solid rgba(20,22,43,.18); }
  .families { grid-template-columns: 1fr; }
  .family, .family--wide { grid-template-columns: 1fr; gap: 14px; }
  .steps4 { grid-template-columns: 1fr 1fr; }
  .timeline { grid-template-columns: 1fr; row-gap: 0; border-inline-start: 2px solid var(--navy); margin-inline-start: 6px; }
  .timeline li { border-top: 0; padding: 0 0 26px 22px; }
  .timeline li::before { top: 2px; inset-inline-start: -8px; }
  .form__row { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
}