/* GostPipe Sourcing — v2 visual system
   Direction: industrial utilitarian × engineering-drawing editorial.
   Memory point: graph-paper texture + technical line-art figures + copper annotations on deep ink.
   Fonts (self-hosted, Cyrillic): Oswald display / Golos Text body / IBM Plex Mono specs.
   Palette locked by brand: deep blue-gray #1B2631 + copper #C0622D. No gradients-as-decoration, no glassmorphism, no emoji. */

/* ---------- Tokens ---------- */
:root {
  --ink: #1B2631;
  --ink-2: #24313C;
  --ink-3: #2E3D49;
  --paper: #F2F0EC;
  --paper-2: #FFFFFF;
  --line: #D9DCDE;
  --line-dark: #3A4650;
  --text: #222B33;
  --muted: #5C6771;
  --steel: #8B97A3;
  --accent: #C0622D;
  --accent-2: #A65224;
  --accent-soft: rgba(192, 98, 45, 0.12);

  --font-display: "Oswald", "Arial Narrow", sans-serif;
  --font-body: "Golos Text", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", Consolas, monospace;

  --fs-hero: clamp(32px, 4.8vw, 56px);
  --fs-h2: clamp(26px, 3vw, 40px);
  --fs-h3: 19px;
  --fs-body: 16px;
  --fs-sm: 13.5px;
  --fs-eyebrow: 12px;

  --s1: 4px; --s2: 8px; --s3: 16px; --s4: 24px; --s5: 40px; --s6: 64px; --s7: 96px;

  --sh1: 0 2px 8px rgba(27, 38, 49, 0.08);
  --sh2: 0 8px 28px rgba(27, 38, 49, 0.12);
  --sh3: 0 24px 64px rgba(27, 38, 49, 0.16);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms;
  --dur-base: 320ms;
  --dur-slow: 640ms;

  --max: 1200px;
  --radius: 2px;
}

/* ---------- Base ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* graph-paper texture — the signature background */
.grid-paper {
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(27, 38, 49, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 38, 49, 0.045) 1px, transparent 1px);
  background-size: 26px 26px;
}
.grid-dark {
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 26px 26px;
}

/* ---------- Header ---------- */
.site-header {
  background: var(--paper-2);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--line);
  box-shadow: var(--sh1);
}
.site-header::after {
  content: "";
  display: block;
  height: 2px;
  background: var(--accent);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 66px;
  gap: 16px;
}
.logo {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}
.logo::before {
  content: "";
  width: 26px;
  height: 26px;
  background: var(--ink);
  border: 3px solid var(--accent);
  border-radius: 50%;
  box-shadow: inset 0 0 0 3px var(--paper-2);
}
.logo span { color: var(--accent); }

.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav > a:not(.btn),
.nav-item > a:not(.btn) {
  display: block;
  padding: 10px 8px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink-2);
  position: relative;
  white-space: nowrap;
}
.main-nav > a:not(.btn)::after,
.nav-item > a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 4px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) ease-out;
}
.main-nav > a:not(.btn):hover::after,
.nav-item > a:not(.btn):hover::after { transform: scaleX(1); }

.nav-item { position: relative; }
.dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 262px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent);
  box-shadow: var(--sh2);
  padding: 6px 0;
}
.nav-item:hover .dropdown { display: block; }
.dropdown a {
  display: block;
  padding: 10px 16px;
  font-size: 13.5px;
  color: var(--muted);
  border-left: 3px solid transparent;
}
.dropdown a:hover {
  background: var(--accent-soft);
  border-left-color: var(--accent);
  color: var(--ink);
}

.lang-switch {
  display: flex;
  flex-shrink: 0;
  border: 1px solid var(--line);
  margin-left: 10px;
}
.lang-btn {
  background: transparent;
  color: var(--muted);
  border: 0;
  padding: 8px 0;
  width: 52px;
  min-width: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-indent: 0.04em; /* compensate trailing letter-spacing so glyphs sit centered */
  white-space: nowrap;
  flex-shrink: 0;
  font-family: var(--font-mono), "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.lang-btn.active { background: var(--ink); color: var(--paper-2); }

.burger {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 9px 11px;
}
.burger svg { display: block; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  white-space: nowrap;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border: 2px solid transparent;
  border-radius: var(--radius);
  transition: background var(--dur-fast) ease-out, color var(--dur-fast) ease-out,
    border-color var(--dur-fast) ease-out, transform var(--dur-fast) ease-out;
}
.btn::after {
  content: "\2192";
  font-family: var(--font-body);
  transition: transform var(--dur-fast) ease-out;
}
.btn:hover::after { transform: translateX(4px); }
.btn:active { transform: translateY(1px); }

.btn-accent { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-accent:hover { background: var(--accent-2); border-color: var(--accent-2); }

.btn-ghost { background: transparent; color: var(--paper-2); border-color: rgba(255, 255, 255, 0.55); }
.btn-ghost:hover { background: var(--paper-2); color: var(--ink); border-color: var(--paper-2); }

.btn-dark { background: var(--ink); color: var(--paper-2); border-color: var(--ink); }
.btn-dark:hover { background: var(--ink-3); border-color: var(--ink-3); }

.btn-sm { padding: 10px 16px; font-size: 12.5px; }

/* header CTA: fixed box so the label (RU/EN/zh lengths differ) never resizes it */
.site-header .btn {
  width: 168px;
  justify-content: center;
  padding: 10px 14px;
  font-size: 11.5px;
  letter-spacing: 0.05em;
}

/* fixed-width buttons: park the arrow at the right edge so the LABEL is centered */
.site-header .btn,
.hero-actions .btn {
  position: relative;
}
.site-header .btn::after,
.hero-actions .btn::after {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
}
.site-header .btn:hover::after,
.hero-actions .btn:hover::after {
  transform: translateY(-50%) translateX(4px);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--ink);
  color: var(--paper-2);
  overflow: hidden;
}
.hero-ph {
  position: absolute;
  inset: 0;
  background: #111A22 url("../../images/port-crane.jpg") center / cover no-repeat;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, rgba(17, 26, 34, 0.95), rgba(23, 34, 43, 0.55));
}
.hero-inner {
  position: relative;
  padding: 88px 0 60px;
  max-width: 680px;
}
.hero .eyebrow { color: #C8B2A0; }
.hero .eyebrow::before { background: var(--accent); }
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: 0.005em;
  margin: 16px 0 20px;
}
.hl { color: var(--accent); }
.hero-lead {
  font-size: 16.5px;
  line-height: 1.7;
  color: #C6CFD6;
  max-width: 540px;
  margin-bottom: 30px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 48px; }
/* hero CTAs: fixed width so language switches don't jump the layout */
.hero-actions .btn { width: 240px; justify-content: center; }
.hero-actions .btn::after { right: 18px; }

.badge-row {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
  background: rgba(17, 25, 32, 0.55);
}
.badge {
  padding: 20px 18px;
  border-left: 1px solid var(--line-dark);
}
.badge:first-child { border-left: 0; }
.badge .b-val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.03em;
  margin-bottom: 6px;
}
.badge .b-label {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--steel);
  line-height: 1.5;
}

/* ---------- Sections & section heads ---------- */
.section { padding: 84px 0; }
.section-alt {
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(27, 38, 49, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 38, 49, 0.045) 1px, transparent 1px);
  background-size: 26px 26px;
}
.section-dark { background: var(--ink); color: var(--paper-2); }

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 12px 56px;
  align-items: end;
  margin-bottom: 52px;
}
.section-head.center { display: block; text-align: center; max-width: 720px; margin-left: auto; margin-right: auto; }
.section-head .eyebrow { grid-column: 1; }
.section-title {
  grid-column: 1;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 600;
  line-height: 1.12;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.section-dark .section-title { color: var(--paper-2); }
.section-sub {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: end;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
  padding-left: 20px;
  border-left: 2px solid var(--accent);
}
.section-dark .section-sub { color: #B7C0C8; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--accent);
}

/* ---------- Cards ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

.card {
  position: relative;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 22px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform var(--dur-base) var(--ease), border-color var(--dur-base) ease-out,
    box-shadow var(--dur-base) ease-out;
}
/* engineering corner ticks */
.card::before,
.card::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--accent);
  opacity: 0;
  transition: opacity var(--dur-fast) ease-out;
}
.card::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.card::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(192, 98, 45, 0.55);
  box-shadow: var(--sh2);
}
.card:hover::before,
.card:hover::after { opacity: 1; }

.card h3 {
  font-family: var(--font-display);
  font-size: var(--fs-h3);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  line-height: 1.35;
}
.card p { color: var(--muted); font-size: 14.5px; flex: 1; }
.card .card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 6px;
}
.card .card-link::after { content: "\2192"; transition: transform var(--dur-fast) ease-out; }
.card .card-link:hover::after { transform: translateX(4px); }

.icon-box {
  width: 46px;
  height: 46px;
  background: var(--ink);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--dur-fast) ease-out, color var(--dur-fast) ease-out;
}
.card:hover .icon-box { background: var(--accent); color: var(--paper-2); }

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 5px 9px;
  background: var(--ink);
  color: var(--accent);
  border-radius: var(--radius);
  width: fit-content;
}
.tag-light {
  background: transparent;
  color: var(--ink-2);
  border: 1px solid var(--line);
}

/* ---------- Figure panels (technical line-art placeholders) ---------- */
.ph {
  position: relative;
  background-color: var(--paper-2);
  background-image: url("../img/fig-detail.svg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border-bottom: 1px solid var(--line);
  min-height: 190px;
}
.ph::after {
  content: attr(data-label);
  position: absolute;
  left: 12px;
  bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  padding: 3px 7px;
}
.ph-lg { min-height: 340px; }
.ph-sm { min-height: 150px; }

.ph[data-label="p-cast-iron-flange.jpg"] { background-image: url("../img/fig-cast-iron.svg"); }
.ph[data-label="p-steel-flange.jpg"] { background-image: url("../img/fig-steel-flange.svg"); }
.ph[data-label="p-wn-flange.jpg"] { background-image: url("../img/fig-wn-flange.svg"); }
.ph[data-label="p-fittings.jpg"] { background-image: url("../img/fig-fittings.svg"); }
.ph[data-label="p-valve.jpg"] { background-image: url("../img/fig-valve.svg"); }
.ph[data-label="p-custom-casting.jpg"] { background-image: url("../img/fig-casting.svg"); }
.ph[data-label="about-foundry.jpg"] { background-image: url("../img/fig-foundry.svg"); }
.ph[data-label="about-qc.jpg"] { background-image: url("../img/fig-qc.svg"); }
.ph[data-label="news-1.jpg"] { background-image: url("../img/fig-news-cost.svg"); }
.ph[data-label="news-2.jpg"] { background-image: url("../img/fig-news-customs.svg"); }
.ph[data-label="news-3.jpg"] { background-image: url("../img/fig-news-check.svg"); }
.ph[data-label="project-1.jpg"],
.ph[data-label="project-2.jpg"],
.ph[data-label="project-3.jpg"],
.ph[data-label="project-4.jpg"] { background-image: url("../img/fig-project.svg"); }

.product-card { padding: 0; overflow: hidden; }
.product-card .card-body { padding: 22px; display: flex; flex-direction: column; gap: 11px; flex: 1; }
.product-card:hover { transform: translateY(-4px); }

/* real product photos in cards / split blocks (user-supplied imagery) */
.card-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  border-radius: var(--radius) var(--radius) 0 0;
}
.split-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
}

/* ---------- Split / about ---------- */
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.split-text p { color: var(--muted); margin-bottom: 16px; }

/* ---------- CTA band ---------- */
.cta-band {
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--paper-2);
  padding: 64px 0;
  border-top: 3px solid var(--accent);
}
.cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.cta-band h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: 0.01em;
}
.cta-terms {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: #B7C0C8;
}
.cta-terms span::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  background: var(--accent);
  margin-right: 9px;
  vertical-align: 1px;
}

/* ---------- Accordion ---------- */
.accordion {
  border-top: 1px solid var(--line);
  background: var(--paper-2);
}
.acc-item { border-bottom: 1px solid var(--line); }
.acc-q {
  width: 100%;
  background: transparent;
  border: 0;
  text-align: left;
  padding: 20px 52px 20px 18px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  position: relative;
  transition: background var(--dur-fast) ease-out, color var(--dur-fast) ease-out;
}
.acc-q:hover { background: var(--accent-soft); color: var(--accent-2); }
.acc-q::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--accent);
}
.acc-item.open .acc-q { color: var(--accent-2); }
.acc-item.open .acc-q::after { content: "\2212"; }
.acc-a {
  display: none;
  padding: 0 52px 22px 18px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}
.acc-item.open .acc-a { display: block; }

/* ---------- Filter ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 36px; }
.filter-btn {
  background: var(--paper-2);
  border: 1px solid var(--line);
  color: var(--ink-2);
  padding: 11px 18px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius);
  transition: all var(--dur-fast) ease-out;
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper-2);
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--paper-2);
  padding: 64px 0 56px;
  border-bottom: 3px solid var(--accent);
}
.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 3.8vw, 48px);
  font-weight: 600;
  line-height: 1.12;
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}
/* GEO: self-contained answer block under the H1 (visible, citable) */
.hero-tldr {
  max-width: 660px;
  margin-top: 16px;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  font-size: 15px;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.74);
}
/* photo-backed page header (projects): real photo + readable overlay */
.page-hero.has-photo {
  background-image:
    linear-gradient(105deg, rgba(17, 26, 34, 0.92), rgba(23, 34, 43, 0.66)),
    url("../../images/flange-stack.jpg");
  background-size: cover, cover;
  background-position: center, center;
}
.page-hero p { color: #C6CFD6; max-width: 720px; font-size: 16.5px; }
.crumb {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 16px;
}
.crumb a { color: var(--accent); }
.crumb span { color: var(--steel); }

/* ---------- Spec table ---------- */
.table-scroll { overflow-x: auto; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table th,
.spec-table td {
  border: 1px solid var(--line);
  padding: 13px 15px;
  text-align: left;
  vertical-align: top;
}
.spec-table th {
  background: var(--ink);
  color: var(--paper-2);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  width: 38%;
}
.spec-table td {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
  background: var(--paper-2);
}

/* ---------- Product detail ---------- */
.pd-top {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 44px;
  align-items: start;
}
.gallery-main { border: 1px solid var(--line); min-height: 380px; overflow: hidden; }
.pd-main-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}
.gallery-thumbs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-top: 10px;
}
.gallery-thumbs img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  cursor: pointer;
  border: 2px solid var(--line);
}
.gallery-thumbs img.active { border-color: var(--accent); }
.gallery-thumbs .ph {
  min-height: 78px;
  cursor: pointer;
  border: 2px solid var(--line);
}
.gallery-thumbs .ph.active { border-color: var(--accent); }

.pd-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 24px 0; }
.pd-contacts {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
}
.pd-contacts strong { color: var(--ink); font-weight: 500; }
.pd-contacts a { color: var(--accent); }
.pd-contacts a:hover { text-decoration: underline; }

.feature-list { display: grid; gap: 13px; }
.feature-list li {
  padding-left: 28px;
  position: relative;
  color: var(--muted);
  font-size: 15px;
}
.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 14px;
  height: 3px;
  background: var(--accent);
}

.tag-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- Forms ---------- */
.form-layout {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 40px;
  align-items: start;
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field.full { grid-column: 1 / -1; }
.field label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink);
}
.field label .req { color: var(--accent); }
.field input,
.field select,
.field textarea {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 13px;
  font-family: var(--font-body);
  font-size: 14.5px;
  color: var(--text);
  background: var(--paper-2);
  transition: border-color var(--dur-fast) ease-out, box-shadow var(--dur-fast) ease-out;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 0;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field textarea { min-height: 118px; resize: vertical; }
.field.error input,
.field.error select,
.field.error textarea { border-color: #B3352B; box-shadow: 0 0 0 3px rgba(179, 53, 43, 0.12); }

.checklist {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  padding: 26px 22px;
}
.checklist h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 16px;
}
.checklist li {
  padding: 10px 0 10px 26px;
  position: relative;
  font-size: 14px;
  color: var(--muted);
  border-bottom: 1px dashed var(--line);
}
.checklist li:last-child { border-bottom: 0; }
.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--accent);
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink);
  color: var(--paper-2);
  border-left: 4px solid var(--accent);
  padding: 15px 24px;
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease);
  z-index: 200;
  max-width: 90vw;
  box-shadow: var(--sh2);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: #B7C0C8;
  padding: 64px 0 0;
  border-top: 3px solid var(--accent);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 36px;
  padding-bottom: 44px;
}
.site-footer .logo { color: var(--paper-2); }
.site-footer .logo::before { box-shadow: inset 0 0 0 3px var(--ink); }
.site-footer h4 {
  font-family: var(--font-display);
  color: var(--paper-2);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.site-footer p { font-size: 14px; line-height: 1.75; }
.site-footer a { transition: color var(--dur-fast) ease-out; }
.site-footer a:hover { color: var(--accent); }
.footer-links li { padding: 6px 0; font-size: 14px; }
.footer-note {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
  margin-top: 14px;
}
.footer-bottom {
  border-top: 1px solid var(--line-dark);
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* ---------- Steps (about) ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
.step {
  position: relative;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-top: 3px solid var(--ink);
  padding: 20px 16px;
  transition: border-color var(--dur-fast) ease-out, transform var(--dur-base) var(--ease);
}
.step:hover { border-top-color: var(--accent); transform: translateY(-3px); }
.step .num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: 10px;
}
.step h3 {
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
  line-height: 1.45;
}

/* ---------- Project meta ---------- */
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.meta-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 5px 9px;
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--ink-2);
}

/* ---------- Article ---------- */
.article-body { max-width: 780px; }
.article-body h2 {
  font-family: var(--font-display);
  font-size: 23px;
  font-weight: 500;
  color: var(--ink);
  margin: 36px 0 14px;
  letter-spacing: 0.01em;
}
.article-body h2::before {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  background: var(--accent);
  margin-bottom: 12px;
}
.article-body p { color: var(--muted); margin-bottom: 15px; line-height: 1.8; }
.date-chip {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.mb-24 { margin-bottom: 24px; }
.mb-40 { margin-bottom: 40px; }
.divider { height: 1px; background: var(--line); margin: 40px 0; }

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
}
.reveal.in {
  opacity: 1;
  transform: none;
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.reveal.in:nth-child(2) { transition-delay: 70ms; }
.reveal.in:nth-child(3) { transition-delay: 140ms; }
.reveal.in:nth-child(4) { transition-delay: 210ms; }

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

/* ---------- Responsive ----------
   RU nav labels are long: collapse to the drawer at 1200px before text gets tight.
   Layout stacking stays at 860px; component density steps at 1024 / 560 / 480. */
@media (max-width: 1200px) {
  .burger { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    background: var(--paper-2);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px 26px;
    border-bottom: 2px solid var(--accent);
    gap: 2px;
    max-height: calc(100vh - 66px);
    overflow-y: auto;
    box-shadow: var(--sh2);
  }
  .main-nav.open { display: flex; }
  .nav-item { width: 100%; }
  .dropdown {
    position: static;
    display: none;
    border: 0;
    border-left: 2px solid var(--accent);
    background: var(--paper);
    min-width: 0;
    box-shadow: none;
  }
  .nav-item.open .dropdown { display: block; }
  .main-nav > a:not(.btn), .nav-item > a:not(.btn) { padding: 13px 6px; font-size: 14px; }
  .lang-switch { margin: 14px 0 0; width: fit-content; }
  .main-nav .btn {
    justify-content: center;
    margin-top: 14px;
    width: 100%;
    font-size: 13px;
    letter-spacing: 0.07em;
    padding: 13px 20px;
  }
}

@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .badge-row { grid-template-columns: repeat(2, 1fr); }
  .badge:nth-child(3) { border-left: 0; }
  .badge:nth-child(n + 3) { border-top: 1px solid var(--line-dark); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: clamp(30px, 5vw, 46px); }
  .hero-inner { padding: 72px 0 56px; }
}

@media (max-width: 860px) {
  .grid-2, .grid-3, .split, .pd-top, .form-layout { grid-template-columns: 1fr; }
  .section-head { grid-template-columns: 1fr; gap: 12px; }
  .section-head .section-sub {
    grid-column: 1;
    grid-row: auto;
    padding-left: 0;
    border-left: 0;
    border-top: 2px solid var(--accent);
    padding-top: 12px;
  }
  .hero-inner { padding: 56px 0 48px; max-width: 100%; }
  .hero h1 { font-size: clamp(28px, 6.4vw, 38px); line-height: 1.18; }
  .hero-lead { font-size: 15px; max-width: 100%; }
  .hero-actions { margin-bottom: 36px; }
  .section { padding: 56px 0; }
  .form-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .table-scroll { -webkit-overflow-scrolling: touch; }
  .pd-top { gap: 28px; }
  .gallery-main { min-height: 260px; }
}

@media (max-width: 560px) {
  .grid-4, .badge-row, .steps, .gallery-thumbs { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .container { padding: 0 16px; }
  .btn { width: 100%; justify-content: center; }
  .hero-actions .btn { width: 100%; }
  .logo { font-size: 16px; gap: 8px; }
  .logo::before { width: 22px; height: 22px; }
  .page-hero { padding: 44px 0 38px; }
  .page-hero h1 { font-size: 25px; line-height: 1.2; }
  .page-hero p { font-size: 14.5px; }
  .section-title { font-size: 23px; }
  .section { padding: 48px 0; }
  .card { padding: 20px 16px 18px; }
  .product-card .card-body { padding: 16px; }
  .hero-inner { padding: 40px 0 36px; }
  .hero h1 { font-size: clamp(26px, 7.6vw, 32px); }
  .badge { padding: 13px 11px; }
  .badge .b-val { font-size: 13px; }
  .badge .b-label { font-size: 11px; letter-spacing: 0.03em; }
  .acc-q { font-size: 15px; padding: 15px 40px 15px 12px; }
  .acc-a { padding: 0 40px 16px 12px; font-size: 14px; }
  .ph { min-height: 150px; }
  .ph-lg { min-height: 210px; }
  .gallery-thumbs .ph { min-height: 62px; }
  .spec-table th, .spec-table td { padding: 10px 11px; font-size: 12.5px; }
  .checklist { padding: 18px 15px; }
  .filter-btn { padding: 9px 13px; font-size: 12px; }
  .footer-bottom { flex-direction: column; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .gallery-thumbs { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; }
  .badge-row { grid-template-columns: 1fr 1fr; }
  .hero-actions { gap: 10px; }
}