/* ==========================================================================
   AT Holding — public site
   Palette taken from the material itself: basalt dark, travertine paper,
   limestone sand, and the turquoise of flooded quarry water as the accent.
   ========================================================================== */

:root {
  --ink: #12151a;
  --ink-2: #1a1f26;
  --ink-3: #232a32;
  --paper: #f1ede5;
  --paper-2: #e5dfd3;
  --sand: #c7b8a1;
  --accent: #12797c;
  --accent-hi: #1aa0a4;
  --line: rgba(199, 184, 161, .22);
  --line-solid: #2b323a;
  --text: #1c2026;
  --text-soft: #5d6673;
  --text-invert: #edeae4;
  --radius: 3px;
  --shell: 1240px;
  --gap: clamp(1rem, 2.5vw, 2rem);
  --section-y: clamp(3rem, 7vw, 6rem);
  --font-body: 'IBM Plex Sans', 'Vazirmatn', system-ui, sans-serif;
  --font-display: 'Archivo', 'Vazirmatn', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Vazirmatn', ui-monospace, monospace;
}
html[lang="fa"], html[lang="ar"] {
  --font-body: 'Vazirmatn', 'IBM Plex Sans', system-ui, sans-serif;
  --font-display: 'Vazirmatn', 'Archivo', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
}
img, video, iframe { max-width: 100%; display: block; }
img { height: auto; object-fit: cover; background: var(--paper-2); }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.25; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(1.9rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.1rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
:focus-visible { outline: 2px solid var(--accent-hi); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip-link { position: absolute; inset-inline-start: -999px; }
.skip-link:focus { inset-inline-start: 1rem; top: 1rem; z-index: 99; background: var(--ink); color: #fff; padding: .5rem 1rem; }
.mono { font-family: var(--font-mono); font-size: .82em; letter-spacing: .01em; }
.muted { color: var(--text-soft); }
.center { text-align: center; }
.mt { margin-top: 1.5rem; }

.shell { width: min(100% - 2.4rem, var(--shell)); margin-inline: auto; }
.shell.narrow { width: min(100% - 2.4rem, 820px); }
.section { padding-block: var(--section-y); }
.section-tint { background: var(--paper-2); }
.section-dark { background: var(--ink); color: var(--text-invert); }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .muted { color: #9aa4b1; }

/* ------------------------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.5rem; border: 1px solid transparent; border-radius: var(--radius);
  font-family: var(--font-display); font-weight: 600; font-size: .95rem; cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-hi); color: #fff; }
.btn-ghost { border-color: currentColor; color: inherit; }
.btn-ghost:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-sm { padding: .55rem 1rem; font-size: .85rem; }
.link-more { color: var(--accent); font-family: var(--font-display); font-weight: 600; font-size: .9rem; }
.link-more::after { content: '›'; margin-inline-start: .4rem; }
html[dir="rtl"] .link-more::after { content: '‹'; }

/* ------------------------------------------------------------------- header */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(18, 21, 26, .96); color: var(--text-invert);
  border-bottom: 1px solid var(--line-solid);
  backdrop-filter: blur(6px);
}
.header-inner { display: flex; align-items: center; gap: 1.5rem; min-height: 74px; }
.brand { display: flex; align-items: center; gap: .75rem; color: #fff; }
.brand-mark {
  display: grid; place-items: center; width: 42px; height: 42px;
  background: var(--accent); color: #fff;
  font-family: var(--font-display); font-weight: 800; letter-spacing: .04em;
}
.brand-text strong { display: block; font-family: var(--font-display); font-size: 1rem; }
.brand-text small { display: block; color: #93a0ad; font-size: .72rem; }
.primary-nav { display: flex; align-items: center; gap: 1.5rem; margin-inline-start: auto; }
.primary-nav > ul { display: flex; align-items: center; gap: 1.2rem; list-style: none; margin: 0; padding: 0; }
.primary-nav a { font-size: .93rem; color: #d7dde4; }
.primary-nav a:hover { color: #fff; }
.primary-nav li { position: relative; }
.sub-nav {
  position: absolute; inset-inline-start: 0; top: 100%; min-width: 220px;
  display: none; flex-direction: column; gap: .2rem; padding: .8rem;
  background: var(--ink-2); border: 1px solid var(--line-solid); list-style: none; margin: 0;
}
.has-children:hover .sub-nav, .has-children:focus-within .sub-nav { display: flex; }
.nav-utils { display: flex; align-items: center; gap: .8rem; }
.nav-search { display: flex; align-items: center; border: 1px solid var(--line-solid); }
.nav-search input { width: 150px; padding: .45rem .7rem; background: transparent; border: 0; color: #fff; font-family: inherit; font-size: .85rem; }
.nav-search input::placeholder { color: #7c8894; }
.nav-search button { background: none; border: 0; color: #9aa4b1; padding-inline: .5rem; cursor: pointer; }
.lang-switch { display: flex; gap: .35rem; font-family: var(--font-mono); font-size: .78rem; }
.lang-switch a { padding: .25rem .45rem; color: #9aa4b1; border: 1px solid transparent; }
.lang-switch a.is-active { color: #fff; border-color: var(--accent); }
.nav-toggle { display: none; margin-inline-start: auto; width: 44px; height: 44px; background: none; border: 1px solid var(--line-solid); cursor: pointer; }
.nav-toggle-bar, .nav-toggle-bar::before, .nav-toggle-bar::after { display: block; width: 20px; height: 2px; margin-inline: auto; background: #fff; content: ''; }
.nav-toggle-bar::before { transform: translateY(-6px); }
.nav-toggle-bar::after { transform: translateY(4px); }

@media (max-width: 1020px) {
  .nav-toggle { display: block; }
  .primary-nav {
    position: fixed; inset: 74px 0 auto; display: none; flex-direction: column; align-items: stretch;
    gap: 0; padding: 1rem 1.2rem 2rem; background: var(--ink); border-bottom: 1px solid var(--line-solid);
    max-height: calc(100vh - 74px); overflow-y: auto;
  }
  .primary-nav.is-open { display: flex; }
  .primary-nav > ul { flex-direction: column; align-items: stretch; gap: 0; }
  .primary-nav > ul > li { border-bottom: 1px solid var(--line-solid); }
  .primary-nav > ul > li > a { display: block; padding: .9rem 0; }
  .sub-nav { position: static; display: flex; border: 0; padding: 0 0 .8rem; background: none; }
  .nav-utils { flex-wrap: wrap; padding-top: 1rem; }
  .nav-search input { width: 100%; }
}

/* --------------------------------------------------------------------- hero */
.hero {
  background: var(--ink) center/cover no-repeat;
  color: var(--text-invert);
  padding-block: clamp(3.5rem, 9vw, 7rem) 0;
}
.hero-inner { max-width: 780px; }
.eyebrow {
  font-family: var(--font-mono); font-size: .8rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--sand); margin-bottom: 1rem;
}
.hero h1 { color: #fff; }
.hero-sub { font-size: clamp(1rem, 1.6vw, 1.2rem); color: #c3ccd6; max-width: 60ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.8rem; }
.stat-rail {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin-top: clamp(2.5rem, 6vw, 4.5rem); border-top: 1px solid var(--line-solid);
}
.stat { padding: 1.4rem 1rem; border-inline-end: 1px solid var(--line-solid); }
.stat:last-child { border-inline-end: 0; }
.stat strong { display: block; font-size: 1.9rem; color: #fff; font-family: var(--font-mono); }
.stat strong small { font-size: .5em; color: var(--sand); margin-inline-start: .35rem; }
.stat span { font-size: .85rem; color: #9aa4b1; }

/* ---------------------------------------------- signature: the value chain */
.chain-rail { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 0; list-style: none; margin: 0; padding: 0; }
.chain-rail li { position: relative; padding: 1.6rem 1.4rem; border-top: 2px solid var(--accent); }
.chain-rail li + li { border-inline-start: 1px solid var(--line); }
.chain-step { display: block; color: var(--accent); font-size: 1.5rem; font-weight: 500; margin-bottom: .6rem; }
.chain-rail h3 { margin-bottom: .3rem; }
.chain-rail p { color: var(--text-soft); font-size: .92rem; margin: 0; }

/* -------------------------------------------------------------- section head */
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: 2.2rem; }
.section-head p { color: var(--text-soft); margin: 0; max-width: 55ch; }

/* --------------------------------------------------------------------- grid */
.card-grid { display: grid; gap: var(--gap); }
.card-grid-2 { grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); }
.card-grid-3 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.card-grid-4 { grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }

.tile, .division-card, .post-card, .product-card, .cert-card, .catalog-card, .wide-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}
.section-dark .division-card { background: var(--ink-2); border-color: var(--line-solid); color: var(--text-invert); }
.tile:hover, .division-card:hover, .post-card:hover, .product-card:hover, .wide-card:hover {
  transform: translateY(-3px); box-shadow: 0 12px 30px rgba(18, 21, 26, .12);
}
.tile img, .division-card img, .post-card img, .cert-card img, .catalog-card img { width: 100%; aspect-ratio: 4 / 3; }
.tile-body, .division-card > div, .post-card > a, .cert-card, .catalog-card { padding: 1.1rem 1.2rem 1.4rem; }
.post-card > a { display: block; }
.post-card img { margin: -1.1rem -1.2rem 1rem; width: calc(100% + 2.4rem); max-width: none; }
.wide-card { display: grid; grid-template-columns: 42% 1fr; }
.wide-card img { height: 100%; min-height: 220px; }
.wide-card > div { padding: 1.4rem 1.5rem; }
@media (max-width: 640px) { .wide-card { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------- product card */
.product-card-media { position: relative; display: block; }
.product-card-media img { width: 100%; aspect-ratio: 4 / 3; }
.product-card-body { padding: 1rem 1.1rem 1.2rem; }
.product-card-body h3 { font-size: 1.05rem; margin-bottom: .5rem; }
.chip {
  display: inline-block; padding: .2rem .6rem; font-family: var(--font-mono); font-size: .7rem;
  background: var(--ink); color: #fff; border-radius: 2px;
}
.chip-accent { position: absolute; inset-block-start: .7rem; inset-inline-start: .7rem; background: var(--accent); }
.spec-inline { display: flex; flex-wrap: wrap; gap: .4rem 1rem; margin: 0 0 .7rem; }
.spec-inline div { display: flex; gap: .35rem; }
.spec-inline dt { color: var(--text-soft); margin: 0; }
.spec-inline dd { margin: 0; }
.availability { font-family: var(--font-mono); font-size: .75rem; padding: .18rem .55rem; border: 1px solid var(--line); border-radius: 2px; }
.availability-in_stock { color: #0f6b4f; border-color: #0f6b4f55; }
.availability-made_to_order { color: var(--accent); border-color: #12797c55; }
.availability-limited { color: #9a6a12; border-color: #9a6a1255; }
.availability-out_of_stock { color: #8a3b3b; border-color: #8a3b3b55; }

/* ------------------------------------------------------------- page header */
.page-header { background: var(--ink); color: var(--text-invert); padding-block: clamp(2.5rem, 6vw, 4.5rem); background-size: cover; background-position: center; }
.page-header h1 { color: #fff; margin: 0; }
.page-header-sub { color: #b9c2cc; margin: .6rem 0 0; max-width: 60ch; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: .5rem; font-size: .82rem; color: #93a0ad; margin-bottom: 1rem; }
.breadcrumb a:hover { color: #fff; }

/* -------------------------------------------------------------------- prose */
.prose { max-width: 72ch; }
.prose h2, .prose h3 { margin-top: 2rem; }
.prose img { margin: 1.5rem 0; border-radius: var(--radius); }
.prose ul, .prose ol { padding-inline-start: 1.4rem; }
.lede { font-size: 1.12rem; color: var(--text-soft); }
.split { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: clamp(1.5rem, 4vw, 3rem); align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }
.side-card { background: #fff; border: 1px solid var(--line); padding: 1.4rem; border-radius: var(--radius); position: sticky; top: 96px; }
.side-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .7rem; }
.side-list li { border-bottom: 1px solid var(--line); padding-bottom: .7rem; }

/* --------------------------------------------------------------- spec table */
.spec-table { width: 100%; border-collapse: collapse; margin-bottom: 1.4rem; }
.spec-table th, .spec-table td { text-align: start; padding: .6rem .2rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec-table th { color: var(--text-soft); font-weight: 500; width: 45%; }

/* ------------------------------------------------------------ product page */
.product-layout { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 3rem); align-items: start; }
@media (max-width: 900px) { .product-layout { grid-template-columns: 1fr; } }
.product-hero { width: 100%; aspect-ratio: 4 / 3; border-radius: var(--radius); }
.thumb-row { display: flex; gap: .5rem; margin-top: .6rem; overflow-x: auto; }
.thumb { flex: 0 0 84px; padding: 0; border: 1px solid var(--line); background: none; cursor: pointer; }
.thumb.is-active { border-color: var(--accent); }
.thumb img { width: 100%; aspect-ratio: 1; }
.finish-strip { border-block: 1px solid var(--line); padding: .9rem 0; margin-bottom: 1.2rem; }
.finish-label { display: block; color: var(--text-soft); margin-bottom: .5rem; letter-spacing: .1em; text-transform: uppercase; }
.finish-strip ul { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; margin: 0; padding: 0; }
.finish-strip li { padding: .3rem .8rem; background: var(--paper-2); font-size: .85rem; border-radius: 2px; }

/* ----------------------------------------------------------------- listing */
.type-tabs { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 2rem; border-bottom: 1px solid var(--line); }
.type-tabs a { padding: .6rem 1rem; font-size: .92rem; border-bottom: 2px solid transparent; }
.type-tabs a.is-active { border-color: var(--accent); color: var(--accent); }
.listing { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem); align-items: start; }
@media (max-width: 860px) { .listing { grid-template-columns: 1fr; } }
.filters { background: #fff; border: 1px solid var(--line); padding: 1.2rem; border-radius: var(--radius); }
.filters h2 { font-size: 1rem; }
.filter-actions { display: flex; gap: .5rem; margin-top: 1rem; }
.result-count { color: var(--text-soft); margin-bottom: 1rem; }
.empty { padding: 2.5rem 0; color: var(--text-soft); }

/* -------------------------------------------------------------------- forms */
.field-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; }
.field { display: grid; gap: .35rem; font-size: .9rem; }
.field-wide { grid-column: 1 / -1; }
.field > span { color: var(--text-soft); }
input[type="text"], input[type="email"], input[type="tel"], input[type="search"], input[type="password"],
input[type="number"], input[type="date"], select, textarea {
  width: 100%; padding: .65rem .8rem; font-family: inherit; font-size: .95rem;
  border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--text);
}
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--accent); outline: none; }
.inquiry-form { background: #fff; border: 1px solid var(--line); padding: clamp(1.2rem, 3vw, 2rem); border-radius: var(--radius); }
.inquiry-form.is-compact { padding: 1.2rem; }
.form-title { margin-bottom: .3rem; }
.form-text { color: var(--text-soft); margin-bottom: 1.2rem; }
.form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; margin-top: 1.2rem; }
.form-actions small { color: var(--text-soft); }
.form-errors { margin: 1rem 0 0; padding-inline-start: 1.2rem; color: #8a3b3b; font-size: .9rem; }
.honeypot { position: absolute; inset-inline-start: -9999px; opacity: 0; height: 0; overflow: hidden; }
.search-form { display: flex; gap: .5rem; margin-bottom: 2rem; }
.search-results { list-style: none; padding: 0; margin: 0; display: grid; gap: .9rem; }
.search-results li { display: flex; justify-content: space-between; gap: 1rem; border-bottom: 1px solid var(--line); padding-bottom: .9rem; }
.catalog-form { display: grid; gap: .5rem; margin-top: .8rem; }

/* ----------------------------------------------------------------- cta band */
.cta-band { background: var(--ink); color: var(--text-invert); }
.cta-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(1.5rem, 4vw, 3rem); align-items: center; }
.cta-band h2 { color: #fff; }
.cta-band p { color: #b9c2cc; max-width: 45ch; }
@media (max-width: 860px) { .cta-inner { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------------ gallery */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: .8rem; }
.gallery-item img, .gallery-item { width: 100%; aspect-ratio: 4 / 3; border-radius: var(--radius); }
.gallery-file { display: block; padding: 1rem; background: #fff; border: 1px solid var(--line); }
.map-frame { width: 100%; height: 380px; border: 1px solid var(--line); border-radius: var(--radius); }

/* --------------------------------------------------------------------- faq */
.faq-list details { background: #fff; border: 1px solid var(--line); padding: 1rem 1.2rem; margin-bottom: .7rem; border-radius: var(--radius); }
.faq-list summary { cursor: pointer; font-family: var(--font-display); font-weight: 600; }
.faq-list details[open] summary { color: var(--accent); margin-bottom: .6rem; }

/* --------------------------------------------------------------- pagination */
.pagination ul { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; padding: 0; margin: 2.5rem 0 0; }
.pagination a, .pagination span { display: block; padding: .5rem .9rem; border: 1px solid var(--line); font-family: var(--font-mono); font-size: .85rem; }
.pagination .is-current { background: var(--accent); border-color: var(--accent); color: #fff; }

/* -------------------------------------------------------------------- flash */
.flash-stack { padding-top: 1.2rem; display: grid; gap: .6rem; }
.flash { padding: .8rem 1.1rem; border-inline-start: 3px solid var(--accent); background: #fff; font-size: .92rem; }
.flash-error { border-color: #8a3b3b; }

/* ------------------------------------------------------------ partner strip */
.partner-strip ul { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 2rem; list-style: none; margin: 0; padding: 0; }
.partner-strip img { max-height: 46px; width: auto; filter: grayscale(1); opacity: .7; }
.partner-strip img:hover { filter: none; opacity: 1; }

/* ------------------------------------------------------------------- footer */
.site-footer { background: var(--ink); color: #b9c2cc; padding-top: clamp(2.5rem, 6vw, 4rem); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 2rem; padding-bottom: 2.5rem; }
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer h3 { color: #fff; margin: 1rem 0 .6rem; }
.site-footer h4 { color: #fff; font-size: .95rem; letter-spacing: .04em; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; font-size: .92rem; }
.footer-social { display: flex; gap: 1rem; margin-top: 1rem; font-size: .85rem; }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; padding: 1.2rem 0; border-top: 1px solid var(--line-solid); font-size: .82rem; }

/* --------------------------------------------------------- floating contact */
.floating-contact {
  position: fixed; inset-block-end: 1.2rem; inset-inline-end: 1.2rem; z-index: 30;
  display: grid; place-items: center; width: 52px; height: 52px; border-radius: 50%;
  background: var(--accent); color: #fff; font-size: 1.4rem; box-shadow: 0 8px 22px rgba(18, 121, 124, .35);
}
.floating-contact:hover { background: var(--accent-hi); color: #fff; }

.error-page { padding-block: clamp(4rem, 12vw, 8rem); }