/* ==========================================================================
   METALL ART 24 — Industrial Premium Design System
   Palette derived from client materials: corten steel (rust/copper),
   charcoal/graphite steel tones, and warm exotic-wood accents seen
   throughout the production photography and reference projects.
   ========================================================================== */

:root {
  /* Core palette */
  --color-ink: #15171a;          /* near-black graphite */
  --color-charcoal: #24272b;     /* dark steel */
  --color-steel: #565b62;        /* mid steel gray */
  --color-steel-light: #9aa0a8;  /* light steel gray */
  --color-fog: #e7e5e1;          /* light warm gray */
  --color-paper: #f6f4f0;        /* off-white background */
  --color-white: #ffffff;
  --color-corten: #a8552c;       /* corten steel / rust accent */
  --color-corten-dark: #7c3d1f;
  --color-wood: #b98a53;         /* exotic wood tone */
  --color-wood-light: #d9b98a;
  --color-line: rgba(21, 23, 26, 0.12);

  /* Semantic */
  --bg: var(--color-paper);
  --bg-alt: var(--color-white);
  --bg-dark: var(--color-ink);
  --text: var(--color-ink);
  --text-soft: var(--color-steel);
  --text-on-dark: #f1efe9;
  --text-on-dark-soft: #b7bcc4;
  --accent: var(--color-corten);

  /* Type */
  --font-display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, sans-serif;

  /* Layout */
  --container-max: 1280px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --shadow-md: 0 12px 32px rgba(21, 23, 26, 0.14);
  --shadow-lg: 0 24px 64px rgba(21, 23, 26, 0.22);
  --transition: 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------------------------- Reset ---------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3, h4 { margin: 0; font-family: var(--font-display); font-weight: 600; letter-spacing: 0.01em; text-transform: uppercase; line-height: 1.05; }
p { margin: 0; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: 1rem; }

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

section { position: relative; }

/* ---------------------------- Typography scale ---------------------------- */
.eyebrow {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--accent);
  display: inline-block;
}
h1, .h1 { font-size: clamp(2.4rem, 5vw, 4.4rem); }
h2, .h2 { font-size: clamp(1.9rem, 3.4vw, 2.8rem); }
h3, .h3 { font-size: clamp(1.3rem, 2vw, 1.6rem); }
.lede { font-size: clamp(1.05rem, 1.4vw, 1.25rem); color: var(--text-soft); max-width: 60ch; }
.section-head { max-width: 760px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------------------------- Buttons ---------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 30px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: transform var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--color-corten-dark); }
.btn-ghost { background: transparent; border-color: currentColor; color: var(--text); }
.btn-ghost:hover { background: var(--text); color: var(--bg); }
.btn-on-dark { border-color: rgba(241,239,233,0.5); color: var(--text-on-dark); }
.btn-on-dark:hover { background: var(--text-on-dark); color: var(--color-ink); }
.btn-arrow::after { content: "→"; }

/* ---------------------------- Header ---------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 244, 240, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}
.brand {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.brand-mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.6rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink);
}
.brand-mark span { color: var(--accent); }
.brand-sub {
  font-size: 0.62rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-top: 2px;
}

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 10px 16px;
  font-size: 0.86rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  position: relative;
}
.main-nav a:hover { color: var(--accent); }
.main-nav a.is-active { color: var(--accent); }
.main-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 16px; right: 16px; bottom: 4px;
  height: 2px;
  background: var(--accent);
}

.header-tools { display: flex; align-items: center; gap: 18px; }

.lang-switch {
  display: flex;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  overflow: hidden;
}
.lang-switch button {
  border: none;
  background: transparent;
  padding: 7px 14px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-soft);
  transition: background var(--transition), color var(--transition);
}
.lang-switch button.is-active { background: var(--color-ink); color: #fff; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  width: 40px; height: 40px;
  position: relative;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: "";
  position: absolute;
  left: 8px; right: 8px;
  height: 2px;
  background: var(--color-ink);
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle span { top: 19px; }
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after { transform: translateY(-7px) rotate(-45deg); }

/* ---------------------------- Hero ---------------------------- */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: flex-end;
  color: var(--text-on-dark);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
}
.hero-bg::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15,16,18,0.35) 0%, rgba(15,16,18,0.55) 55%, rgba(15,16,18,0.92) 100%);
}
.hero-content { position: relative; padding: 80px 0 72px; max-width: 900px; }
.hero .eyebrow { color: var(--color-wood-light); }
.hero .eyebrow::before { background: var(--color-wood-light); }
.hero h1 { color: #fff; margin: 18px 0 22px; }
.hero .lede { color: var(--text-on-dark-soft); max-width: 56ch; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 36px; }

.page-hero {
  min-height: 52vh;
  display: flex;
  align-items: flex-end;
}
.page-hero .hero-content { padding: 64px 0 56px; }

/* ---------------------------- Sections ---------------------------- */
.section { padding: 96px 0; }
.section-tight { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--bg-dark); color: var(--text-on-dark); }
.section-dark .eyebrow { color: var(--color-wood-light); }
.section-dark .eyebrow::before { background: var(--color-wood-light); }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .lede { color: var(--text-on-dark-soft); }

/* About / value props */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.value-list { display: grid; gap: 28px; margin-top: 40px; }
.value-item { display: flex; gap: 20px; }
.value-icon {
  flex: none;
  width: 52px; height: 52px;
  border: 1px solid var(--color-line);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
}
.value-icon svg { width: 26px; height: 26px; }
.value-item h3 { text-transform: none; font-size: 1.1rem; margin-bottom: 6px; }
.value-item p { color: var(--text-soft); font-size: 0.96rem; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--color-line);
}
.stat { text-align: left; }
.stat-num { font-family: var(--font-display); font-size: clamp(2rem, 3vw, 2.8rem); color: var(--accent); line-height: 1; }
.stat-label { margin-top: 8px; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-soft); }

/* Three pillars */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.pillar-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  min-height: 420px;
  display: flex;
  align-items: flex-end;
  color: #fff;
  box-shadow: var(--shadow-md);
}
.pillar-card .pillar-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  transition: transform 700ms ease;
}
.pillar-card:hover .pillar-bg { transform: scale(1.06); }
.pillar-card::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(20,21,23,0.05) 20%, rgba(15,16,18,0.92) 92%);
}
.pillar-body { position: relative; padding: 32px; }
.pillar-index { font-family: var(--font-display); font-size: 0.85rem; letter-spacing: 0.2em; color: var(--color-wood-light); }
.pillar-body h3 { color: #fff; font-size: 1.35rem; margin: 10px 0 12px; text-transform: uppercase; }
.pillar-body p { color: var(--text-on-dark-soft); font-size: 0.92rem; margin-bottom: 18px; }
.pillar-link { font-size: 0.82rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: #fff; display: inline-flex; gap: 8px; }

/* Certifications */
.cert-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.cert-card {
  border: 1px solid rgba(241,239,233,0.18);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
}
.cert-card .cert-badge {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  color: var(--color-wood-light);
  margin-bottom: 10px;
}
.cert-card p { color: var(--text-on-dark-soft); font-size: 0.88rem; }

/* Image band / split */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.split.reverse .split-media { order: 2; }
.split-media img { border-radius: var(--radius-md); box-shadow: var(--shadow-md); width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3; }
.split ul.checklist { margin-top: 24px; display: grid; gap: 14px; }
.checklist li { display: flex; gap: 12px; align-items: flex-start; color: var(--text-soft); font-size: 0.96rem; }
.checklist li::before { content: "—"; color: var(--accent); font-weight: 700; flex: none; }

/* Full-bleed closing image */
.full-bleed {
  height: 60vh;
  min-height: 420px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
}
.full-bleed::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(15,16,18,0.75) 0%, rgba(15,16,18,0.15) 60%);
}
.full-bleed .container { position: relative; }
.full-bleed-content { max-width: 520px; color: #fff; }
.full-bleed-content .lede { color: var(--text-on-dark-soft); }

/* ---------------------------- Cards / grids ---------------------------- */
.card-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

.product-card {
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition);
}
.product-card:hover { transform: translateY(-6px); }
.product-card .thumb { aspect-ratio: 4/3; overflow: hidden; }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 500ms ease; }
.product-card:hover .thumb img { transform: scale(1.08); }
.product-card .body { padding: 20px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.product-card h3 { text-transform: none; font-size: 1.08rem; margin-bottom: 8px; }
.product-card .tag { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); font-weight: 700; margin-bottom: 10px; }
.product-card p { color: var(--text-soft); font-size: 0.9rem; flex: 1; }
.spec-list { margin-top: 14px; border-top: 1px solid var(--color-line); padding-top: 12px; display: grid; gap: 6px; }
.spec-list div { display: flex; justify-content: space-between; font-size: 0.82rem; color: var(--text-soft); gap: 12px; }
.spec-list dt { font-weight: 600; color: var(--text); }

/* Mini gallery strip (additional real-world examples per category) */
.mini-gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 28px; }
.mini-gallery img { width: 100%; height: 160px; object-fit: cover; border-radius: var(--radius-sm); box-shadow: var(--shadow-md); }
@media (max-width: 920px) { .mini-gallery { grid-template-columns: repeat(2, 1fr); } }

/* Category filter bar */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 44px;
}
.filter-btn {
  padding: 10px 20px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: transparent;
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-soft);
  transition: all var(--transition);
}
.filter-btn:hover { border-color: var(--accent); color: var(--accent); }
.filter-btn.is-active { background: var(--color-ink); border-color: var(--color-ink); color: #fff; }

.category-group { margin-bottom: 88px; }
.category-group:last-child { margin-bottom: 0; }
.category-head { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; margin-bottom: 32px; border-bottom: 1px solid var(--color-line); padding-bottom: 20px; }
.category-head p { color: var(--text-soft); max-width: 56ch; }

/* Process steps */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; counter-reset: step; }
.process-step {
  background: var(--bg-alt);
  padding: 32px 26px;
  position: relative;
}
.process-step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--color-line);
  display: block;
  margin-bottom: 18px;
}
.process-step h3 { font-size: 1.02rem; text-transform: none; margin-bottom: 10px; }
.process-step p { font-size: 0.88rem; color: var(--text-soft); }

/* Machine park list (industrial services) */
.machine-groups { display: grid; gap: 4px; }
.machine-group { background: var(--bg-alt); padding: 40px; border-radius: var(--radius-md); display: grid; grid-template-columns: 260px 1fr; gap: 40px; }
.machine-group-title { display: flex; flex-direction: column; gap: 6px; }
.machine-group-title .num { font-family: var(--font-display); font-size: 0.85rem; letter-spacing: 0.2em; color: var(--accent); }
.machine-group-title img.machine-photo { width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: var(--radius-md); margin-top: 12px; }
.machine-list { display: grid; gap: 18px; }
.machine-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding-bottom: 18px; border-bottom: 1px solid var(--color-line); }
.machine-row:last-child { border-bottom: none; padding-bottom: 0; }
.machine-row h4 { text-transform: none; font-size: 1rem; margin-bottom: 6px; }
.machine-row p { color: var(--text-soft); font-size: 0.88rem; }

/* Case studies */
.case-study {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: var(--bg-alt);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-bottom: 32px;
}
.case-study img { width: 100%; height: 100%; object-fit: cover; min-height: 340px; }
.case-body { padding: 48px; display: flex; flex-direction: column; justify-content: center; }
.case-body .eyebrow { margin-bottom: 14px; }
.case-body h3 { font-size: 1.5rem; text-transform: none; margin-bottom: 14px; }
.case-body p { color: var(--text-soft); }
.case-study.reverse { direction: rtl; }
.case-study.reverse .case-body { direction: ltr; }
.case-study.reverse img { direction: ltr; }

/* Gallery (masonry-ish via CSS columns) */
.masonry { columns: 4; column-gap: 20px; }
.masonry .gallery-item { break-inside: avoid; margin-bottom: 20px; position: relative; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-md); }
.masonry .gallery-item img { width: 100%; display: block; }
.gallery-caption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 16px 18px;
  background: linear-gradient(0deg, rgba(15,16,18,0.88), rgba(15,16,18,0));
  color: #fff;
  font-size: 0.82rem;
  opacity: 0;
  transform: translateY(6px);
  transition: all var(--transition);
}
.gallery-item:hover .gallery-caption { opacity: 1; transform: translateY(0); }
.gallery-caption .cap-tag { display: block; font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--color-wood-light); margin-bottom: 4px; }

/* Reference/trust logos strip */
.trust-strip { display: flex; flex-wrap: wrap; gap: 40px; align-items: center; justify-content: space-between; padding: 32px 0; border-top: 1px solid var(--color-line); border-bottom: 1px solid var(--color-line); }
.trust-strip span { font-family: var(--font-display); text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-soft); font-size: 0.95rem; }

/* ---------------------------- Contact ---------------------------- */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 64px; }
.contact-card { background: var(--bg-alt); border-radius: var(--radius-md); padding: 40px; box-shadow: var(--shadow-md); }
.contact-detail { display: flex; gap: 16px; margin-bottom: 26px; }
.contact-detail:last-child { margin-bottom: 0; }
.contact-detail h4 { text-transform: uppercase; font-size: 0.78rem; letter-spacing: 0.1em; color: var(--text-soft); margin-bottom: 6px; }
.contact-detail p, .contact-detail a { font-size: 1rem; }
.contact-detail a:hover { color: var(--accent); }
.contact-icon { flex: none; width: 40px; height: 40px; border-radius: 50%; background: var(--color-fog); display: flex; align-items: center; justify-content: center; color: var(--accent); }
.contact-icon svg { width: 20px; height: 20px; }

.dept-list { margin-top: 32px; display: grid; gap: 14px; }
.dept-item { display: flex; align-items: center; gap: 12px; font-size: 0.9rem; color: var(--text-soft); }
.dept-item::before { content: ""; width: 8px; height: 8px; background: var(--accent); border-radius: 50%; flex: none; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-grid .full { grid-column: 1 / -1; }
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.field label { font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-soft); }
.field input, .field select, .field textarea {
  padding: 13px 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  color: var(--text);
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.field-file {
  border: 1px dashed var(--color-line);
  border-radius: var(--radius-sm);
  padding: 18px 16px;
  font-size: 0.86rem;
  color: var(--text-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.consent { display: flex; gap: 10px; align-items: flex-start; font-size: 0.82rem; color: var(--text-soft); margin-bottom: 24px; }
.consent input { margin-top: 4px; }
.form-note { font-size: 0.8rem; color: var(--text-soft); margin-top: 16px; }
.form-success {
  display: none;
  background: var(--color-ink);
  color: #fff;
  padding: 28px;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}
.form-success.is-visible { display: block; }
.form-success h3 { color: #fff; text-transform: none; margin-bottom: 8px; }
.form-success p { color: var(--text-on-dark-soft); }

.map-frame { margin-top: 32px; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-md); }
.map-frame iframe { width: 100%; height: 320px; border: 0; display: block; }

/* ---------------------------- Footer ---------------------------- */
.site-footer { background: var(--bg-dark); color: var(--text-on-dark-soft); padding: 72px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 48px; padding-bottom: 48px; border-bottom: 1px solid rgba(241,239,233,0.14); }
.footer-brand .brand-mark { color: #fff; }
.footer-brand p { margin-top: 16px; color: var(--text-on-dark-soft); font-size: 0.9rem; max-width: 34ch; }
.footer-col h4 { font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; color: #fff; margin-bottom: 18px; }
.footer-col ul { display: grid; gap: 12px; }
.footer-col a, .footer-col p { font-size: 0.9rem; color: var(--text-on-dark-soft); }
.footer-col a:hover { color: var(--color-wood-light); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; font-size: 0.8rem; flex-wrap: wrap; gap: 12px; }
.footer-socials { display: flex; gap: 14px; }
.footer-socials a { width: 36px; height: 36px; border: 1px solid rgba(241,239,233,0.25); border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.footer-socials svg { width: 16px; height: 16px; }

/* ---------------------------- Reveal-on-scroll ---------------------------- */
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 700ms ease, transform 700ms ease; }
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

/* ---------------------------- Utilities ---------------------------- */
.mt-0 { margin-top: 0 !important; }
.text-center { text-align: center; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: 12px; top: -60px;
  background: var(--color-ink); color: #fff; padding: 12px 18px;
  border-radius: var(--radius-sm); z-index: 1000; transition: top var(--transition);
}
.skip-link:focus { top: 12px; }

/* ---------------------------- Responsive ---------------------------- */
@media (max-width: 1100px) {
  .card-grid { grid-template-columns: repeat(3, 1fr); }
  .pillar-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .machine-group { grid-template-columns: 1fr; gap: 20px; }
  .masonry { columns: 3; }
}

@media (max-width: 920px) {
  .main-nav { display: none; }
  .header-tools .btn-primary { display: none; }
  .nav-toggle { display: block; }
  .site-header { position: sticky; }
  .main-nav.is-open {
    display: flex;
    position: absolute;
    top: 84px; left: 0; right: 0;
    background: var(--bg-alt);
    flex-direction: column;
    padding: 12px 24px 24px;
    border-bottom: 1px solid var(--color-line);
    box-shadow: var(--shadow-md);
  }
  .main-nav.is-open a { padding: 14px 4px; width: 100%; border-bottom: 1px solid var(--color-line); }
  .about-grid, .split, .contact-grid { grid-template-columns: 1fr; }
  .split-media { order: -1 !important; }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .pillar-grid, .card-grid, .card-grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .case-study { grid-template-columns: 1fr; }
  .case-study img { min-height: 240px; }
  .masonry { columns: 2; }
  .form-grid { grid-template-columns: 1fr; }
  .cert-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .container { padding: 0 18px; }
  .section { padding: 64px 0; }
  .hero { min-height: 78vh; }
  .card-grid, .card-grid.cols-3, .pillar-grid, .process-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr 1fr; gap: 20px; }
  .masonry { columns: 1; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}