/* ==========================================================================
   FIRMA YEVROKHIM TOV — tech-precision
   Oxford navy, anthracite panels, electric azure structure, neon signal.
   ========================================================================== */

:root {
  --bg: #07111c;
  --bg-alt: #0c1826;
  --bg-deep: #050b14;
  --ink: #e7eef6;
  --ink-soft: #9aafc4;
  --ink-invert: #061018;
  --accent: #3dff9a;
  --accent-soft: #123028;
  --line: #1e3348;
  --line-faint: #13283a;
  --azure: #3aa0ff;
  --graphite: #142233;
  --face-top: #1a3d5c;
  --face-side: #102233;
  --face-front: #17344c;
  --font-display: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --tracking-display: -0.03em;
  --radius: 0px;
  --radius-lg: 0px;
  --shadow: 0 0 0 1px var(--line);
  --container: 1180px;
  color-scheme: dark;
}

::selection { background: var(--accent); color: var(--ink-invert); }

body { background: var(--bg); }

.site-header {
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom-color: var(--line);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  text-decoration: none;
}

.logo__mark {
  width: 36px;
  height: 36px;
  flex: none;
  color: var(--ink);
}

.logo__mark path {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
}

.logo__node { fill: var(--accent); }
.logo__node--core { fill: var(--azure); }

.logo__name {
  display: block;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1.1;
}

.logo__legal {
  display: block;
  margin-top: 0.15rem;
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.nav a {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.72;
}

.eyebrow { font-family: var(--font-display); letter-spacing: 0.16em; }

.btn--primary { color: var(--ink-invert); }
.btn--ghost { color: var(--ink); border-color: var(--line); }
.btn--ghost:hover {
  background: var(--accent);
  color: var(--ink-invert);
  border-color: var(--accent);
}

.section__head { max-width: 40rem; margin-bottom: clamp(1.75rem, 3vw, 2.75rem); }
.section__head h2 { margin-top: 0.4rem; }
.section__head .lede { margin-top: 0.8rem; }

/* --- HERO --- */
.hero {
  position: relative;
  padding-top: clamp(2rem, 4vw, 3.5rem);
  background-image:
    linear-gradient(to right, var(--line-faint) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-faint) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: center top;
}

.hero__rail {
  display: none;
  position: absolute;
  top: 5rem;
  right: 1rem;
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.hero__grid {
  display: grid;
  gap: var(--gap);
  align-items: end;
}

.hero h1 { max-width: 12em; }

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.hero__photo {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  background: var(--bg-deep);
}

.hero__photo img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.hero__photo figcaption,
.gallery figcaption {
  padding: 0.55rem 0.75rem;
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.hero__facts {
  list-style: none;
  display: grid;
  gap: 0.75rem;
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
}

.hero__facts li {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  font-size: var(--step--1);
  color: var(--ink-soft);
}

.hero__facts span {
  font-family: var(--font-display);
  color: var(--accent);
}

/* --- SERVICES --- */
.section--services { background: var(--bg-alt); }

.svc {
  display: grid;
  gap: 0.45rem;
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}

.svc:last-child { border-bottom: 1px solid var(--line); }

.svc__n {
  font-family: var(--font-display);
  color: var(--azure);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

.svc h3 { font-size: var(--step-1); }
.svc p { color: var(--ink-soft); max-width: 62ch; }

/* --- SYSTEMS --- */
.sys-grid { display: grid; gap: var(--gap); }

.sys {
  padding: 1.25rem 1.2rem 1.4rem;
  background: var(--graphite);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.sys__code {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--accent);
}

.sys h3 { margin: 0.7rem 0 0.45rem; }
.sys p { color: var(--ink-soft); }

/* --- GALLERY --- */
.section--plant { background: var(--bg); }

.gallery {
  display: grid;
  gap: 0.75rem;
}

.gallery figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--bg-deep);
}

.gallery img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.gallery__lead img { height: 280px; }

/* --- COMPANY --- */
.section--company { background: var(--bg-alt); }

.company { display: grid; gap: var(--gap); align-items: start; }
.company__copy p + p { margin-top: 1rem; }

.plate {
  padding: 1.25rem 1.2rem;
  background: var(--bg-deep);
  border: 1px solid var(--azure);
}

.plate__kicker {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--azure);
}

.plate__list {
  list-style: none;
  margin: 1rem 0;
  padding: 0;
}

.plate__list li {
  display: flex;
  gap: 0.8rem;
  padding: 0.45rem 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 0.86rem;
}

.plate__list span { color: var(--accent); }

.plate__meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.35rem;
  font-size: var(--step--1);
  color: var(--ink-soft);
}

.plate__meta span {
  font-family: var(--font-display);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
}

/* --- PATH --- */
.path {
  list-style: none;
  display: grid;
  gap: 1rem;
  padding: 0;
  margin: 0;
}

.path li {
  padding-top: 0.9rem;
  border-top: 2px solid var(--azure);
}

.path__n {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--accent);
}

.path h3 { margin: 0.45rem 0; }
.path p { color: var(--ink-soft); }

/* --- DESK --- */
.section--desk {
  background:
    linear-gradient(to right, var(--line-faint) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-faint) 1px, transparent 1px),
    var(--bg-deep);
  background-size: 48px 48px, 48px 48px, auto;
}

.desk { position: relative; }

.desk__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  overflow: hidden;
}

.desk__layout { display: grid; gap: 0.75rem; }

.desk__switches { display: grid; gap: 0.5rem; align-content: start; }

.tumbler {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  padding: 0.75rem 0.8rem;
  border: 1px solid var(--line);
  background: var(--graphite);
  cursor: pointer;
}

.tumbler__switch {
  width: 44px;
  height: 26px;
  border: 1px solid var(--line);
  background: var(--bg-deep);
  position: relative;
}

.tumbler__knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: var(--ink-soft);
  transition: transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.tumbler__name { display: block; font-size: 0.92rem; line-height: 1.3; }
.tumbler__sub {
  display: block;
  margin-top: 0.15rem;
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.tumbler__state {
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}

.tumbler__state::after { content: "OFF"; }

.desk__stage,
.card {
  border: 1px solid var(--line);
  background: var(--bg);
}

.stage__bar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 0;
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.live { display: none; color: var(--accent); }

.plant { width: 100%; height: auto; }

.plant__ground polygon { fill: var(--graphite); stroke: var(--line); }
.plant__ground path { fill: none; stroke: var(--line-faint); stroke-width: 1; }

.zone .left { fill: var(--face-side); stroke: var(--line); }
.zone .right { fill: var(--face-front); stroke: var(--line); }
.zone .top { fill: var(--face-top); stroke: var(--line); }
.zone .tank { fill: var(--graphite); stroke: var(--azure); }
.zone .tank--lid { fill: var(--face-top); }
.zone .stack { fill: var(--face-side); stroke: var(--line); }
.zone .pipe,
.zone .door { fill: none; stroke: var(--ink-soft); stroke-width: 1.4; }
.zone .glow { fill: var(--accent); opacity: 0; }

.zone .top,
.zone .left,
.zone .right,
.zone .glow,
.zone .tank,
.tumbler,
.tumbler__knob {
  transition: fill 0.3s var(--ease), stroke 0.3s var(--ease), opacity 0.3s var(--ease),
    border-color 0.3s var(--ease), transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.card { display: none; padding: 1.1rem 1.15rem 1.25rem; }
.card--coat { display: block; }
.card__kicker {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--azure);
}
.card h3 { margin: 0.45rem 0 0.55rem; font-size: var(--step-1); }
.card p { color: var(--ink-soft); }

.metrics {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0 0;
}

.metrics div {
  padding-top: 0.55rem;
  border-top: 1px solid var(--line);
}

.metrics dt {
  font-family: var(--font-display);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.metrics dd {
  margin: 0.2rem 0 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink);
}

.desk__note {
  margin-top: 0.9rem;
  font-size: var(--step--1);
  color: var(--ink-soft);
}

/* Checked zone */
#desk-coat:checked ~ .desk__layout .live--coat,
#desk-bond:checked ~ .desk__layout .live--bond,
#desk-whole:checked ~ .desk__layout .live--whole,
#desk-retail:checked ~ .desk__layout .live--retail { display: inline; }

#desk-coat:focus-visible ~ .desk__layout label[for="desk-coat"],
#desk-bond:focus-visible ~ .desk__layout label[for="desk-bond"],
#desk-whole:focus-visible ~ .desk__layout label[for="desk-whole"],
#desk-retail:focus-visible ~ .desk__layout label[for="desk-retail"] {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

#desk-coat:checked ~ .desk__layout label[for="desk-coat"],
#desk-bond:checked ~ .desk__layout label[for="desk-bond"],
#desk-whole:checked ~ .desk__layout label[for="desk-whole"],
#desk-retail:checked ~ .desk__layout label[for="desk-retail"] {
  border-color: var(--accent);
}

#desk-coat:checked ~ .desk__layout label[for="desk-coat"] .tumbler__knob,
#desk-bond:checked ~ .desk__layout label[for="desk-bond"] .tumbler__knob,
#desk-whole:checked ~ .desk__layout label[for="desk-whole"] .tumbler__knob,
#desk-retail:checked ~ .desk__layout label[for="desk-retail"] .tumbler__knob {
  transform: translateX(18px);
  background: var(--accent);
}

#desk-coat:checked ~ .desk__layout label[for="desk-coat"] .tumbler__state,
#desk-bond:checked ~ .desk__layout label[for="desk-bond"] .tumbler__state,
#desk-whole:checked ~ .desk__layout label[for="desk-whole"] .tumbler__state,
#desk-retail:checked ~ .desk__layout label[for="desk-retail"] .tumbler__state {
  color: var(--accent);
}

#desk-coat:checked ~ .desk__layout label[for="desk-coat"] .tumbler__state::after,
#desk-bond:checked ~ .desk__layout label[for="desk-bond"] .tumbler__state::after,
#desk-whole:checked ~ .desk__layout label[for="desk-whole"] .tumbler__state::after,
#desk-retail:checked ~ .desk__layout label[for="desk-retail"] .tumbler__state::after {
  content: "LIVE";
}

#desk-bond:checked ~ .desk__layout .card--coat,
#desk-whole:checked ~ .desk__layout .card--coat,
#desk-retail:checked ~ .desk__layout .card--coat { display: none; }

#desk-bond:checked ~ .desk__layout .card--bond,
#desk-whole:checked ~ .desk__layout .card--whole,
#desk-retail:checked ~ .desk__layout .card--retail { display: block; }

#desk-coat:checked ~ .desk__layout .zone--coat .top,
#desk-bond:checked ~ .desk__layout .zone--bond .top,
#desk-whole:checked ~ .desk__layout .zone--whole .top,
#desk-retail:checked ~ .desk__layout .zone--retail .top {
  fill: var(--azure);
  stroke: var(--accent);
}

#desk-coat:checked ~ .desk__layout .zone--coat .glow,
#desk-bond:checked ~ .desk__layout .zone--bond .glow,
#desk-whole:checked ~ .desk__layout .zone--whole .glow,
#desk-retail:checked ~ .desk__layout .zone--retail .glow { opacity: 0.28; }

#desk-bond:checked ~ .desk__layout .zone--coat .top,
#desk-whole:checked ~ .desk__layout .zone--coat .top,
#desk-retail:checked ~ .desk__layout .zone--coat .top { fill: var(--face-top); stroke: var(--line); }

#desk-bond:checked ~ .desk__layout .zone--coat .glow,
#desk-whole:checked ~ .desk__layout .zone--coat .glow,
#desk-retail:checked ~ .desk__layout .zone--coat .glow { opacity: 0; }

/* --- CONTACT --- */
.section--contact { background: var(--bg-alt); }

.contact { display: grid; gap: var(--gap); }

.contact__addr {
  margin-top: 1.25rem;
  font-style: normal;
  line-height: 1.6;
}

.contact__addr span {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
}

.contact__lines {
  display: grid;
  gap: 0.25rem;
  margin-top: 1rem;
}

.contact__lines a { color: var(--accent); text-decoration: none; }
.contact__lines a:hover { text-decoration: underline; }

.form {
  display: grid;
  gap: 0.9rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  background: var(--bg);
}

.form__row { display: grid; gap: 0.9rem; }

.field input,
.field textarea {
  background: var(--bg-deep);
  border-color: var(--line);
  color: var(--ink);
  border-radius: var(--radius);
}

.field textarea { resize: vertical; min-height: 8rem; }

/* --- FOOTER --- */
.footer__grid {
  display: grid;
  gap: 1.5rem;
}

.footer__brand p { margin-top: 0.9rem; color: var(--ink-soft); max-width: 36ch; }

.site-footer nav {
  display: grid;
  gap: 0.35rem;
}

.site-footer nav a { text-decoration: none; color: var(--ink-soft); }
.site-footer nav a:hover { color: var(--ink); }

.site-footer .eyebrow { margin-bottom: 0.45rem; }

/* --- BREAKPOINTS --- */
@media (min-width: 700px) {
  .hero__facts { grid-template-columns: repeat(3, 1fr); }
  .sys-grid { grid-template-columns: 1fr 1fr; }
  .svc {
    grid-template-columns: 3.5rem minmax(12rem, 16rem) 1fr;
    gap: 1rem 1.5rem;
    align-items: start;
  }
  .svc p { margin: 0; }
  .metrics { grid-template-columns: repeat(3, 1fr); }
  .form__row { grid-template-columns: 1fr 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .path { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 768px) {
  .gallery { grid-template-columns: 1.05fr 1fr; }
  .gallery__lead { grid-row: 1 / span 3; }
  .gallery__lead img { height: 100%; min-height: 540px; }
  .gallery figure:not(.gallery__lead) img { height: 172px; }
}

@media (min-width: 960px) {
  .hero__rail { display: block; }
  .hero__grid { grid-template-columns: 1.05fr 0.95fr; }
  .company { grid-template-columns: 1.3fr 0.7fr; }
  .contact { grid-template-columns: 0.85fr 1.15fr; align-items: start; }
  .path { grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr 0.8fr; }
  .desk__layout {
    grid-template-columns: minmax(240px, 300px) 1fr;
    grid-template-areas:
      "switches stage"
      "switches card";
  }
  .desk__switches { grid-area: switches; }
  .desk__stage { grid-area: stage; }
  .desk__cards { grid-area: card; }
}

@media (min-width: 1200px) {
  .hero__rail { right: 1.5rem; }
}