/* ============================================================================
   ARC Stone — theme custom layer
   Dark, editorial concrete-industrial design. Inspired by the "go.arch"
   architecture layout: fixed brand rail, vertical page-lines, giant ghost
   section titles, full-bleed tall cards, letterspaced Oswald headings.
   Brand accent: #FFC802 (yellow). Body: Montserrat. Headings/UI: Oswald.

   Foundation (reset, tokens, base type, .container, utilities) comes from
   globals.css (millend-css, linked first). Here we (1) re-point the semantic
   tokens to the ARC dark palette + brand fonts UNLAYERED (beats every @layer),
   and (2) build all site chrome in @layer custom.
   ============================================================================ */

/* ---- token overrides (unlayered → win over globals.css token layer) ------- */
:root {
  color-scheme: dark;

  /* brand */
  --primary:        #FFC802;
  --primary-hover:  #ffd633;
  --primary-dark:   #e0ad00;
  --on-primary:     #161310;

  /* dark neutrals */
  --arc-ink:        #121212;   /* page */
  --arc-ink-2:      #171717;   /* alternating band */
  --arc-panel:      #1b1b1b;   /* raised panel / card */
  --arc-card:       #1e1e1e;
  --arc-line:       rgba(255, 255, 255, 0.09);
  --arc-line-soft:  rgba(255, 255, 255, 0.05);
  --arc-white:      #f4f3ef;
  --arc-dim:        #86847d;   /* WCAG AA: 5:1 on the #0d0d0d footer (was #6f6d68 = 3.7:1, failed) */
  --arc-partner-tone: #9c9a94;   /* uniform monochrome tint for partner logos */
  --arc-media-radius: 12px;      /* shared corner radius: product stage + every 3D viewer */

  /* map millend-css semantic tokens onto the dark palette */
  --surface:        var(--arc-ink);
  --surface-raised: var(--arc-panel);
  --text:           #cbc9c3;
  --text-soft:      #8d8b85;
  --border:         var(--arc-line);

  /* type */
  --font-primary:   'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-secondary: 'Oswald', 'Montserrat', system-ui, sans-serif;

  /* display sizes (Oswald) */
  --display-1: clamp(2.4rem, 1.4rem + 4.4vw, 5rem);
  --display-2: clamp(1.9rem, 1.3rem + 2.7vw, 3.3rem);
  --display-3: clamp(1.5rem, 1.15rem + 1.5vw, 2.25rem);

  /* shell geometry */
  --arc-rail-w:   3.25rem;   /* fixed decorative left rail (desktop) */
  --arc-logo-h:     4.6rem;                                   /* brand logo height; shrinks when stuck */
  --arc-header-pad: var(--space-xs);                          /* top+bottom header padding, identical stuck/unstuck */
  --arc-header-h:   calc(var(--arc-logo-h) + 2 * var(--arc-header-pad));  /* full (unstuck) header height — content offset */
  --arc-shell:    var(--width-full);
  --arc-gutter:   clamp(1.5rem, 4vw, 3rem);   /* single side gutter, used everywhere */
}

/* Lenis smooth scroll — kept UNLAYERED so the !important scroll-behavior
   override beats globals.css `html{scroll-behavior:smooth}`. Without this the
   native smooth-scroll fights Lenis and scrolling feels heavy / held-back. */
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-smooth [data-lenis-prevent] { overscroll-behavior: contain; }
.lenis.lenis-stopped { overflow: clip; }
.lenis.lenis-smooth iframe { pointer-events: none; }

/* Base element styling lives in @layer base (NOT unlayered) so component
   rules in @layer custom — button text colour, .arc-prose heading spacing —
   win by normal cascade instead of being clobbered by these resets.
   Only the :root token block above stays unlayered (to beat globals.css). */
@layer base {

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--arc-ink);
  color: var(--text);
  font-family: var(--font-primary);
  font-size: var(--text-m);
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, picture, svg, video, model-viewer { max-width: 100%; display: block; height: auto; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: 500;
  line-height: 1.08;
  color: var(--arc-white);
  text-wrap: balance;
  margin: 0;
}

a { color: inherit; text-decoration: none; }

::selection { background: var(--primary); color: var(--on-primary); }

::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: var(--arc-ink); }
::-webkit-scrollbar-thumb { background: #2c2c2c; border-radius: 99px; border: 3px solid var(--arc-ink); }
::-webkit-scrollbar-thumb:hover { background: #3a3a3a; }

:where(:focus-visible) { outline: 2px solid var(--primary); outline-offset: 3px; }

} /* /@layer base */

@layer custom {

  /* skip link — hidden until keyboard-focused, then pinned top-left */
  .arc-skip {
    position: fixed; top: 0; left: 0; z-index: 200;
    transform: translateY(-120%);
    background: var(--primary); color: var(--on-primary);
    padding: .7rem 1.2rem; border-radius: 0 0 6px 0;
    font-family: var(--font-secondary); font-weight: 600; letter-spacing: .02em;
    transition: transform .18s ease;
  }
  .arc-skip:focus { transform: translateY(0); outline: 0; }
  .arc-content:focus { outline: none; }   /* don't ring the whole <main> on skip */

  /* =========================================================================
     SHELL / DECOR
     ========================================================================= */
  .arc-shell { position: relative; }

  /* Vertical page-lines — three faint guide rules running the full height,
     the signature go.arch decoration. Fixed behind everything. */
  .arc-lines {
    position: fixed; inset: 0;
    pointer-events: none; z-index: 0;
    width: min(100% - (var(--arc-gutter) * 2), var(--arc-shell));
    margin-inline: auto;
  }
  .arc-lines::before,
  .arc-lines::after,
  .arc-lines span {
    content: ""; position: absolute; top: 0; bottom: 0; width: 1px;
    background: var(--arc-line-soft);
  }
  .arc-lines::before { left: 25%; }
  .arc-lines span    { left: 50%; }
  .arc-lines::after  { left: 75%; }

  .arc-content { position: relative; z-index: 1; }

  /* Single container — header, hero inner and every section share it so
     content edges line up vertically down the whole page (consistent gutter). */
  .arc-container {
    width: min(100% - (var(--arc-gutter) * 2), var(--arc-shell));
    margin-inline: auto;
  }

  /* Fixed decorative left rail: rotated tagline + socials. Desktop only. */
  .arc-rail {
    position: fixed; left: 0; top: 0; bottom: 0; width: var(--arc-rail-w);
    z-index: 30; display: none;
    flex-direction: column; align-items: center; justify-content: space-between;
    padding-block: 1.5rem;
    border-right: 1px solid var(--arc-line);
    background: rgba(18, 18, 18, 0.6);
    backdrop-filter: blur(4px);
  }
  .arc-rail__tag {
    writing-mode: vertical-rl; transform: rotate(180deg);
    font-family: var(--font-secondary); text-transform: uppercase;
    letter-spacing: 0.32em; font-size: 0.62rem; color: var(--text-soft);
    display: flex; align-items: center; gap: 1.4rem;
  }
  .arc-rail__tag::after { content: ""; width: 1px; height: 3.5rem; background: var(--arc-line); }
  .arc-rail__social { display: flex; flex-direction: column; gap: 1rem; }
  .arc-rail__social a { color: var(--text-soft); font-size: 0.5rem; letter-spacing: .15em;
    writing-mode: vertical-rl; text-transform: uppercase; transition: color .2s; }
  .arc-rail__social a:hover { color: var(--primary); }

  /* =========================================================================
     HEADER / NAV
     ========================================================================= */
  .arc-header {
    position: fixed; inset-inline: 0; top: 0; z-index: 40;
    padding-block: var(--arc-header-pad);
    display: flex; align-items: center;
    transition: background .35s ease, border-color .35s ease;
    border-bottom: 1px solid transparent;
  }
  .arc-header.is-stuck {
    background: rgba(16, 16, 16, 0.92);
    backdrop-filter: blur(10px);
    border-bottom-color: var(--arc-line);
    --arc-logo-h: 4rem;
  }
  .arc-header__inner {
    display: flex; align-items: center; justify-content: space-between;
    gap: var(--space-s);
  }

  .arc-brand {
    font-family: var(--font-secondary); font-weight: 600;
    font-size: 1.5rem; letter-spacing: 0.04em; text-transform: uppercase;
    color: var(--arc-white); line-height: 1; white-space: nowrap;
    display: inline-flex; align-items: center;
  }
  .arc-brand b { font-weight: 600; }
  .arc-brand i { color: var(--primary); font-style: normal; }
  .arc-brand img { height: var(--arc-logo-h); width: auto; display: block; transition: height .35s ease; }

  .arc-nav { display: none; }
  .arc-nav ul { display: flex; align-items: center; gap: clamp(1.25rem, 2.4vw, 2.6rem);
    list-style: none; margin: 0; padding: 0; }
  .arc-nav > ul > li { position: relative; }
  .arc-nav a {
    font-family: var(--font-secondary); text-transform: uppercase;
    letter-spacing: 0.14em; font-size: 1rem; font-weight: 400;
    color: var(--arc-white); padding-block: 1.4rem; display: inline-flex; align-items: center; gap: .4rem;
    transition: color .2s;
  }
  .arc-nav a:hover, .arc-nav li.is-active > a { color: var(--primary); }
  .arc-nav__caret { font-size: .6rem; opacity: .6; }

  /* dropdown (category submenu) */
  .arc-nav__sub {
    position: absolute; top: 100%; left: -1rem; min-width: 15rem;
    background: var(--arc-panel); border: 1px solid var(--arc-line);
    padding: .5rem; list-style: none; margin: 0;
    opacity: 0; visibility: hidden; transform: translateY(8px);
    transition: opacity .2s, transform .2s, visibility .2s; box-shadow: 0 24px 50px rgba(0,0,0,.5);
  }
  /* 2×2 grid (four categories) — beats the `.arc-nav ul { display:flex }`
     rule above (higher specificity); items never wrap to two lines. */
  .arc-nav ul.arc-nav__sub {
    display: grid; grid-template-columns: 1fr 1fr; gap: .15rem;
    min-width: 26rem; left: -1rem;
  }
  .arc-nav li:hover > .arc-nav__sub { opacity: 1; visibility: visible; transform: translateY(0); }
  .arc-nav__sub a { display: block; padding: .65rem .9rem; letter-spacing: .08em; font-size: 1rem; white-space: nowrap; }
  .arc-nav__sub a:hover { background: rgba(255,255,255,.04); }

  /* Compact on mobile (full size restored at >=900px). Sits next to the burger. */
  .arc-header__cta {
    margin-left: auto;
    font-size: 1rem; letter-spacing: 0.08em;
    padding: 0.7rem 1.15rem; gap: 0.5rem;
  }
  .arc-header__cta .arc-btn__arrow { font-size: 0.9em; }

  /* language switcher — inline (desktop) hidden on mobile; lives in the drawer there */
  .arc-lang { display: none; align-items: center; gap: 0.1rem; }
  .arc-lang__opt {
    font-family: 'Oswald', sans-serif; font-weight: 500;
    font-size: 0.85rem; letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--text-soft); line-height: 1; padding: 0.4rem 0.45rem;
    border-radius: 0.2rem; transition: color 0.2s, background 0.2s;
  }
  .arc-lang__opt:hover { color: var(--arc-white); }
  .arc-lang__opt.is-active { color: var(--primary); }
  .arc-lang__opt + .arc-lang__opt { border-left: 1px solid var(--arc-line); }

  /* drawer variant: full-width pills under the mobile CTA */
  .arc-lang--mobile {
    display: flex; gap: 0.5rem; margin-top: var(--space-l);
    padding-top: var(--space-m); border-top: 1px solid var(--arc-line);
  }
  .arc-lang--mobile .arc-lang__opt {
    flex: 1; text-align: center; border: 1px solid var(--arc-line);
    padding: 0.7rem 0.5rem; font-size: 0.8rem;
  }
  .arc-lang--mobile .arc-lang__opt + .arc-lang__opt { border-left: 1px solid var(--arc-line); }
  .arc-lang--mobile .arc-lang__opt.is-active { border-color: var(--primary); color: var(--primary); }

  /* footer variant: always visible (the base switcher is hidden below 720px),
     bordered pill group centered in the bottom bar */
  .arc-lang--footer {
    display: inline-flex; border: 1px solid var(--arc-line); border-radius: 0.25rem;
  }
  .arc-lang--footer .arc-lang__opt {
    color: var(--arc-dim); font-size: 0.75rem; padding: 0.3rem 0.55rem;
  }
  .arc-lang--footer .arc-lang__opt:hover { color: var(--arc-white); }
  .arc-lang--footer .arc-lang__opt.is-active { color: var(--primary); }

  /* burger */
  .arc-burger {
    appearance: none; border: 0; background: transparent; cursor: pointer;
    width: 2.75rem; height: 2.75rem; display: inline-flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 5px; padding: 0;
  }
  .arc-burger span { width: 24px; height: 2px; background: var(--arc-white); transition: transform .3s, opacity .3s; }
  body.nav-open .arc-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  body.nav-open .arc-burger span:nth-child(2) { opacity: 0; }
  body.nav-open .arc-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* mobile drawer */
  .arc-mobile {
    position: fixed; inset: 0; z-index: 39;
    background: var(--arc-ink); padding: 6rem var(--space-l) var(--space-l);
    transform: translateX(100%); transition: transform .4s cubic-bezier(.5,0,.2,1);
    overflow-y: auto; visibility: hidden;
  }
  body.nav-open .arc-mobile { transform: translateX(0); visibility: visible; }
  .arc-mobile ul { list-style: none; margin: 0; padding: 0; }
  .arc-mobile > ul > li { border-bottom: 1px solid var(--arc-line); }
  .arc-mobile a {
    display: block; padding: 1rem 0; font-family: var(--font-secondary);
    text-transform: uppercase; letter-spacing: .14em; font-size: 1.05rem; color: var(--arc-white);
  }
  .arc-mobile a:hover { color: var(--primary); }
  .arc-mobile__sub a { padding: .5rem 0 .5rem 1rem; font-size: .85rem; color: var(--text-soft); }
  /* Drawer CTA: the generic `.arc-mobile a` link styles above out-specify
     `.arc-btn`, so restore the button look explicitly (full-width pill, dark text). */
  .arc-mobile .button, .arc-mobile .arc-btn {
    display: flex; justify-content: center;
    margin-top: var(--space-xl);
    padding: 1rem 1.7rem;
    color: var(--on-primary);
    font-size: 0.8rem; letter-spacing: 0.16em;
    border-radius: var(--radius-pill);
  }
  .arc-mobile .arc-btn:hover { color: var(--on-primary); }

  /* =========================================================================
     BUTTONS
     ========================================================================= */
  .button, .arc-btn {
    --_bg: var(--primary); --_fg: var(--on-primary);
    display: inline-flex; align-items: center; gap: .7rem;
    background: var(--_bg); color: var(--_fg);
    font-family: var(--font-secondary); text-transform: uppercase;
    letter-spacing: 0.16em; font-size: 0.78rem; font-weight: 500;
    padding: 0.95rem 1.7rem; border-radius: var(--radius-pill); border: 1px solid var(--_bg);
    cursor: pointer; transition: background .2s, color .2s, border-color .2s, transform .2s;
    line-height: 1; white-space: nowrap;
  }
  .button:hover, .arc-btn:hover { background: var(--primary-hover); border-color: var(--primary-hover); color: var(--on-primary); transform: translateY(-2px); }
  .arc-btn__arrow { transition: transform .25s; }
  .button:hover .arc-btn__arrow, .arc-btn:hover .arc-btn__arrow { transform: translateX(4px); }

  .arc-btn--ghost {
    --_bg: transparent; --_fg: var(--arc-white);
    border-color: var(--arc-line);
  }
  .arc-btn--ghost:hover { --_fg: var(--on-primary); background: var(--primary); border-color: var(--primary); }

  .arc-btn--line {
    background: transparent; color: var(--arc-white); border: 0; border-radius: 0;
    padding: 0; gap: .9rem;
  }
  .arc-btn--line::after { content: ""; width: 2.4rem; height: 1px; background: var(--primary); transition: width .25s; }
  .arc-btn--line:hover { background: transparent; transform: none; color: var(--primary); }
  .arc-btn--line:hover::after { width: 3.4rem; }

  /* =========================================================================
     SECTION SCAFFOLD + GHOST TITLES
     ========================================================================= */
  .arc-section { position: relative; padding-block: clamp(3.5rem, 7vw, 7.5rem); }
  .arc-section--tight { padding-block: clamp(2.5rem, 4vw, 4rem); }
  .arc-section--alt { background: var(--arc-ink-2); }

  /* =========================================================================
     LOCATION MAP (full-bleed OpenStreetMap embed, contact page)
     ========================================================================= */
  .arc-map { position: relative; width: 100%; background: var(--arc-ink-2); }
  .arc-map__frame {
    display: block; width: 100%; height: clamp(20rem, 42vw, 30rem); border: 0;
    filter: grayscale(.25) contrast(1.04);
  }
  .arc-map__link {
    position: absolute; right: var(--space-m); bottom: var(--space-m); z-index: 1;
    display: inline-flex; align-items: center; gap: .4rem;
    background: var(--arc-ink); color: var(--arc-white);
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .12em;
    font-size: var(--text-s); padding: .55rem .9rem; border: 1px solid var(--arc-line);
    transition: color .2s, border-color .2s;
  }
  .arc-map__link:hover { color: var(--primary); border-color: var(--primary); }

  .arc-head { position: relative; margin-bottom: clamp(2rem, 4vw, 3.5rem); }
  .arc-head--center { text-align: center; }
  .arc-head--center .arc-head__eyebrow { width: fit-content; margin-inline: auto; justify-content: center; }
  .arc-head__eyebrow {
    font-family: var(--font-secondary); text-transform: uppercase;
    letter-spacing: 0.34em; font-size: var(--text-m); font-weight: 400; color: var(--arc-white);
    display: flex; align-items: baseline; gap: .5ch; flex-wrap: wrap;
  }
  .arc-head__eyebrow em { color: var(--primary); font-style: normal; }
  .arc-head__lead { margin-top: var(--space-s); max-width: 46ch; color: var(--text-soft); }

  /* giant faint watermark word behind the heading */
  .arc-ghost {
    position: absolute; left: -0.04em; bottom: 100%; margin-bottom: -0.28em;
    font-family: var(--font-secondary); font-weight: 700; text-transform: capitalize;
    font-size: clamp(4rem, 13vw, 11rem); line-height: .8;
    color: #ffffff; opacity: 0.035; pointer-events: none; user-select: none;
    white-space: nowrap; z-index: -1;
  }

  /* =========================================================================
     HERO
     ========================================================================= */
  .arc-hero {
    position: relative; min-height: 100svh; display: flex; align-items: center;
    padding-top: var(--arc-header-h);
    isolation: isolate; color: var(--arc-white);
  }
  .arc-hero__bg { position: absolute; inset: 0; z-index: -2; }
  .arc-hero__bg img { width: 100%; height: 100%; object-fit: cover; }
  .arc-hero::after {
    content: ""; position: absolute; inset: 0; z-index: -1;
    background:
      linear-gradient(90deg, rgba(12,12,12,.92) 0%, rgba(12,12,12,.55) 45%, rgba(12,12,12,.25) 100%),
      linear-gradient(0deg, rgba(12,12,12,.9) 0%, rgba(12,12,12,0) 40%);
  }
  .arc-hero__inner { padding-block: clamp(3rem, 8vw, 7rem); }
  .arc-hero__tag {
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .3em;
    font-size: .8rem; color: var(--primary); margin-bottom: 1.4rem;
    display: inline-flex; align-items: center; gap: 1rem;
  }
  .arc-hero__tag::before { content: ""; width: 3rem; height: 1px; background: var(--primary); }
  .arc-hero__title {
    font-size: var(--display-1); font-weight: 500; letter-spacing: 0.01em;
    text-transform: uppercase; max-width: 18ch;
  }
  .arc-hero__title b { color: var(--primary); font-weight: 500; }
  .arc-hero__sub { margin-top: var(--space-m); max-width: 46ch; font-size: var(--text-l); color: #d9d7d1; }
  .arc-hero__actions { margin-top: var(--space-xl); display: flex; flex-wrap: wrap; gap: var(--space-m); align-items: center; }
  .arc-hero__scroll {
    position: absolute; bottom: 1.6rem; left: 50%; transform: translateX(-50%);
    writing-mode: vertical-rl; font-family: var(--font-secondary); text-transform: uppercase;
    letter-spacing: .25em; font-size: .65rem; color: var(--text-soft);
    display: none; align-items: center; gap: 1rem;
  }
  .arc-hero__scroll::after { content: ""; width: 1px; height: 3rem; background: var(--arc-line); animation: arc-scrolldot 2s infinite; }
  @keyframes arc-scrolldot { 0%,100%{opacity:.2} 50%{opacity:1} }

  /* =========================================================================
     ABOUT (copy + spec + image)
     ========================================================================= */
  .arc-about__grid { display: grid; gap: var(--space-xl); grid-template-columns: 1fr; }
  .arc-about__lead { font-family: var(--font-secondary); font-weight: 300; text-transform: uppercase;
    font-size: var(--display-3); line-height: 1.15; color: var(--arc-white); letter-spacing: .01em; }
  .arc-about__lead b { color: var(--primary); font-weight: 400; }
  .arc-about__text { color: var(--text-soft); margin-top: var(--space-m); }
  .arc-about__media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 5; }

  .arc-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--arc-line); border: 1px solid var(--arc-line); }
  .arc-stat { background: var(--arc-ink); padding: var(--space-l); }
  .arc-stat__num { font-family: var(--font-secondary); font-weight: 600; font-size: clamp(2.2rem,5vw,3.4rem); color: var(--primary); line-height: 1; }
  .arc-stat__label { margin-top: .5rem; font-size: var(--text-s); color: var(--text-soft); text-transform: uppercase; letter-spacing: .12em; }

  /* =========================================================================
     CATEGORY CARDS (tall full-bleed)
     ========================================================================= */
  .arc-cats { display: grid; gap: var(--space-m); grid-template-columns: 1fr; }
  .arc-cat-card {
    position: relative; display: block; overflow: hidden; isolation: isolate;
    min-height: clamp(20rem, 38vw, 30rem); background: var(--arc-panel);
    border: 1px solid var(--arc-line);
  }
  .arc-cat-card__img { position: absolute; inset: 0; z-index: -2; }
  .arc-cat-card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .9s cubic-bezier(.2,.6,.2,1); }
  .arc-cat-card::after { content: ""; position: absolute; inset: 0; z-index: -1;
    background: linear-gradient(0deg, rgba(10,10,10,.92) 0%, rgba(10,10,10,.35) 55%, rgba(10,10,10,.15) 100%); transition: background .4s; }
  .arc-cat-card:hover .arc-cat-card__img img { transform: scale(1.06); }
  .arc-cat-card:hover::after { background: linear-gradient(0deg, rgba(10,10,10,.95) 0%, rgba(20,18,8,.55) 60%, rgba(10,10,10,.2) 100%); }
  .arc-cat-card__body { position: absolute; inset: auto 0 0 0; padding: var(--space-l); display: flex; align-items: flex-end; justify-content: space-between; gap: var(--space-m); }
  .arc-cat-card__title { font-size: var(--display-3); text-transform: uppercase; font-weight: 500; }
  .arc-cat-card__count { font-family: var(--font-secondary); font-size: .72rem; letter-spacing: .18em; text-transform: uppercase; color: var(--primary); margin-bottom: .6rem; display: block; }
  .arc-cat-card__go { flex: none; width: 3rem; height: 3rem; border-radius: 50%; border: 1px solid var(--arc-line);
    display: grid; place-items: center; color: var(--arc-white); transition: background .25s, color .25s, border-color .25s; }
  .arc-cat-card:hover .arc-cat-card__go { background: var(--primary); color: var(--on-primary); border-color: var(--primary); }
  .arc-cat-card__label { position: absolute; left: var(--space-m); top: var(--space-l);
    writing-mode: vertical-rl; font-family: var(--font-secondary); text-transform: uppercase;
    letter-spacing: .3em; font-size: .6rem; color: rgba(255,255,255,.5); }

  /* =========================================================================
     PRODUCT CARDS (light tile)
     ========================================================================= */
  /* ---- category filter bar ---- */
  .arc-filters {
    display: flex; flex-wrap: wrap; gap: .55rem;
    margin-bottom: clamp(1.75rem, 3vw, 2.75rem);
    margin-top: calc(-1 * clamp(.5rem, 1.5vw, 1.25rem));
  }
  .arc-filter {
    font-family: var(--font-secondary); text-transform: uppercase;
    letter-spacing: .16em; font-size: .72rem; font-weight: 500; line-height: 1;
    color: var(--text-soft); background: transparent;
    border: 1px solid var(--arc-line); border-radius: 0;
    padding: .72rem 1.1rem; display: inline-flex; align-items: center; gap: .55rem;
    cursor: pointer; transition: color .2s, border-color .2s, background .2s;
  }
  .arc-filter:hover { color: var(--arc-white); border-color: rgba(255,255,255,.22); }
  .arc-filter:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
  .arc-filter__n {
    font-size: .62rem; letter-spacing: .06em; color: var(--text-soft);
    background: rgba(255,255,255,.05); padding: .18rem .5rem; border-radius: 99px;
    transition: color .2s, background .2s;
  }
  .arc-filter.is-active { color: var(--on-primary); background: var(--primary); border-color: var(--primary); }
  .arc-filter.is-active .arc-filter__n { color: var(--on-primary); background: rgba(0,0,0,.16); }

  .arc-pcard.is-hidden { display: none; }
  .arc-products[data-filtering] .arc-pcard:not(.is-hidden) { animation: arc-card-in .4s cubic-bezier(.2,.6,.2,1) both; }
  @keyframes arc-card-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
  @media (prefers-reduced-motion: reduce) {
    .arc-products[data-filtering] .arc-pcard:not(.is-hidden) { animation: none; }
  }
  .arc-products__empty {
    font-family: var(--font-secondary); text-transform: uppercase;
    letter-spacing: .16em; font-size: .8rem; color: var(--text-soft);
    padding: var(--space-l) 0;
  }

  .arc-products { display: grid; gap: var(--space-m);
    grid-template-columns: repeat(auto-fill, minmax(min(15rem, 100%), 1fr)); }
  .arc-pcard {
    display: flex; flex-direction: column; background: var(--arc-card);
    border: 1px solid var(--arc-line); overflow: hidden; transition: border-color .25s, transform .25s;
  }
  .arc-pcard:hover { border-color: rgba(255,200,2,.5); transform: translateY(-4px); }
  .arc-pcard__media {
    position: relative; aspect-ratio: 4 / 3; background:
      radial-gradient(120% 120% at 50% 25%, #efece6 0%, #d9d5cc 100%);
    display: grid; place-items: center; padding: var(--space-m); overflow: hidden;
  }
  .arc-pcard__media img { width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; transition: transform .5s; }
  .arc-pcard:hover .arc-pcard__media img { transform: scale(1.05); }
  .arc-pcard__badge { position: absolute; top: .7rem; left: .7rem; background: rgba(0,0,0,.6); color: #fff;
    font-family: var(--font-secondary); font-size: .6rem; letter-spacing: .15em; text-transform: uppercase; padding: .3rem .6rem; }
  .arc-pcard__3d { position: absolute; top: .7rem; right: .7rem; background: var(--primary); color: var(--on-primary);
    font-family: var(--font-secondary); font-size: .58rem; letter-spacing: .12em; text-transform: uppercase; padding: .3rem .55rem; font-weight:600; }
  .arc-pcard__body { padding: var(--space-m); display: flex; flex-direction: column; gap: .35rem; flex: 1; }
  .arc-pcard__cat { font-family: var(--font-secondary); font-size: .62rem; letter-spacing: .18em; text-transform: uppercase; color: var(--primary); }
  .arc-pcard__title { font-size: var(--text-l); text-transform: uppercase; font-weight: 500; color: var(--arc-white); }
  .arc-pcard__dims { font-size: var(--text-s); color: var(--text-soft); }
  .arc-pcard__code { align-self: flex-start; font-family: var(--font-secondary); font-weight: 600;
    font-size: .6rem; letter-spacing: .16em; text-transform: uppercase; color: var(--arc-white);
    border: 1px solid var(--arc-line); padding: .18rem .5rem; }
  .arc-pcard__foot { margin-top: auto; padding-top: var(--space-s);
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .14em; font-size: .72rem; color: var(--arc-white);
    display: inline-flex; align-items: center; gap: .6rem; transition: color .2s; }
  .arc-pcard:hover .arc-pcard__foot { color: var(--primary); }

  /* =========================================================================
     EXPERIENCE / NUMBER BAND
     ========================================================================= */
  .arc-band {
    position: relative; isolation: isolate; padding-block: clamp(4rem, 10vw, 9rem);
    text-align: center; color: var(--arc-white);
  }
  .arc-band__bg { position: absolute; inset: 0; z-index: -2; }
  .arc-band__bg img { width: 100%; height: 100%; object-fit: cover; }
  .arc-band::after { content:""; position:absolute; inset:0; z-index:-1; background: rgba(12,12,12,.82); }
  .arc-band__num { font-family: var(--font-secondary); font-weight: 700; font-size: clamp(4.5rem, 14vw, 11rem);
    line-height: .85; color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,.35); }
  .arc-band__num em { color: var(--primary); -webkit-text-stroke: 0; font-style: normal; }
  .arc-band__text { font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .2em;
    font-size: var(--text-l); margin-top: var(--space-m); }
  .arc-band__text b { color: var(--primary); font-weight: 500; }

  /* =========================================================================
     FEATURE SPLIT (3D highlight)
     ========================================================================= */
  .arc-split { display: grid; gap: var(--space-xl); grid-template-columns: 1fr; align-items: center; }
  .arc-split__media { background: var(--arc-panel); border: 1px solid var(--arc-line); padding: var(--space-l); }
  .arc-split__media .arcstone-3d-viewer { aspect-ratio: 1 / 1; }
  .arc-split__title { font-size: var(--display-2); text-transform: uppercase; font-weight: 500; }
  .arc-split__title b { color: var(--primary); font-weight: 500; }
  .arc-split__text { color: var(--text-soft); margin-top: var(--space-m); }
  .arc-checklist { list-style: none; margin: var(--space-m) 0 0; padding: 0; display: grid; gap: .8rem; }
  .arc-checklist li { display: flex; gap: .8rem; align-items: flex-start; color: var(--text); }
  .arc-checklist li::before { content: ""; flex: none; width: 1.4rem; height: 1.4rem; margin-top: .15rem;
    background-color: var(--primary); border-radius: 3px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23161310' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: center; background-size: .9rem; }

  /* =========================================================================
     PARTNERS / RESELLERS
     ========================================================================= */
  .arc-partners {
    --arc-marquee-gap: calc(var(--space-2xl) * 2);
    overflow: hidden;
    background: var(--arc-ink-2);            /* dark band; logos are transparent + masked to one tone */
    padding-block: var(--space-l);
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
            mask-image: linear-gradient(90deg, transparent, #000 6%, #000 94%, transparent);
  }
  /* Track scrolls one group-width per loop; JS sets --arc-marquee-dist (px) and
     duration so the speed is constant and the loop is seamless at any viewport. */
  .arc-partners__track {
    display: flex; width: max-content;
    animation: arc-marquee var(--arc-marquee-dur, 24s) linear infinite;
  }
  .arc-partners:hover .arc-partners__track { animation-play-state: paused; }
  .arc-partners__group {
    display: flex; align-items: center; flex: 0 0 auto;
    gap: var(--arc-marquee-gap);
    padding-left: var(--arc-marquee-gap);
  }
  .arc-partners__logo {
    flex: 0 0 auto;
    display: grid; place-items: center;
  }
  /* Each logo is painted as a single flat tone via a mask of its own shape, so
     five differently-coloured logos read as one unified monochrome set. The
     source image's transparency is the stencil (all five are transparent).
     --ar (w/h) sizes the mark to its natural width at a fixed height; very wide
     marks (K-Rauta) clamp to max-width and letterbox via mask contain. */
  .arc-partners__mark {
    display: block;
    height: 2.6rem;
    width: min(12rem, calc(2.6rem * var(--ar, 4)));
    background: var(--arc-partner-tone);
    -webkit-mask: var(--logo) center / contain no-repeat;
            mask: var(--logo) center / contain no-repeat;
    transition: background .25s ease;
  }
  .arc-partners__logo:hover .arc-partners__mark { background: var(--arc-white); }
  @keyframes arc-marquee { to { transform: translateX(calc(-1 * var(--arc-marquee-dist, 50%))); } }
  /* Until JS measures (or if JS is off) fall back to a centered static row. */
  .arc-partners__track:not([data-marquee-ready]) {
    animation: none; flex-wrap: wrap; justify-content: center; width: 100%;
  }
  @media (prefers-reduced-motion: reduce) {
    .arc-partners__track { animation: none !important; flex-wrap: wrap; justify-content: center; width: 100%; }
  }

  /* =========================================================================
     CTA BAND
     ========================================================================= */
  .arc-cta { background: var(--primary); color: var(--on-primary); }
  .arc-cta__inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-l);
    padding-block: clamp(2.5rem, 5vw, 4rem); }
  .arc-cta__title { font-size: var(--display-2); text-transform: uppercase; font-weight: 600; color: var(--on-primary); max-width: 20ch; }
  .arc-cta .arc-btn { background: var(--on-primary); color: var(--primary); border-color: var(--on-primary); }
  .arc-cta .arc-btn:hover { background: #000; border-color: #000; }

  /* =========================================================================
     CATALOG / CATEGORY HERO + BREADCRUMBS
     ========================================================================= */
  .arc-pagehero { position: relative; isolation: isolate; padding-top: calc(var(--arc-header-h) + clamp(2.5rem,6vw,5rem));
    padding-bottom: clamp(2rem, 5vw, 4rem); color: var(--arc-white); overflow: hidden; }
  .arc-pagehero--img::after { content:""; position:absolute; inset:0; z-index:-1; background: linear-gradient(90deg, rgba(12,12,12,.94), rgba(12,12,12,.6)); }
  .arc-pagehero__bg { position:absolute; inset:0; z-index:-2; }
  .arc-pagehero__bg img { width:100%; height:100%; object-fit:cover; }
  /* Font cap: longest single-word title (RU "КОНФИДЕНЦИАЛЬНОСТИ", 18ch) must fit the
     container on phones or overflow-wrap orphan-breaks it; cap is inert above ~560px. */
  .arc-pagehero__title { font-size: min(var(--display-1), 9.4vw - 4px); text-transform: uppercase; font-weight: 500; max-width: 20ch; hyphens: auto; }
  .arc-pagehero__lead { margin-top: var(--space-m); max-width: 52ch; color: #cfcdc7; }

  .arc-crumbs { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-bottom: var(--space-m);
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .14em; font-size: .68rem; color: var(--text-soft); }
  .arc-crumbs a { color: var(--text-soft); transition: color .2s; }
  .arc-crumbs a:hover { color: var(--primary); }
  .arc-crumbs span.sep { opacity: .5; }
  .arc-crumbs span.cur { color: var(--arc-white); }

  /* =========================================================================
     SINGLE PRODUCT
     ========================================================================= */
  .arc-product { display: grid; gap: var(--space-xl); grid-template-columns: 1fr; padding-top: var(--space-xl); align-items: start; }
  .arc-product__media { display: flex; flex-direction: column; gap: var(--space-m); position: relative; }
  /* Dark "studio" stage: a top-lit panel that sits inside the dark theme. The
     grey concrete renders are transparent PNGs shown with normal blending and
     a soft floor shadow so they read against the dark backdrop. */
  .arc-product__stage {
    position: relative;
    background: radial-gradient(120% 100% at 50% 8%, #2a2a27 0%, #1a1a18 55%, #121210 100%);
    border: 1px solid var(--arc-line); aspect-ratio: 4 / 3; overflow: hidden;
    border-radius: var(--arc-media-radius);   /* clips every view (3D + images) to one shared radius */
  }
  .arc-product__stage::after {                 /* grounding floor shadow */
    content: ""; position: absolute; left: 50%; bottom: 7%; transform: translateX(-50%);
    width: 62%; height: 9%; border-radius: 50%; pointer-events: none; z-index: 0;
    background: radial-gradient(ellipse at center, rgba(0,0,0,.55) 0%, rgba(0,0,0,0) 70%);
  }
  .arc-media-view { position: absolute; inset: 0; display: none; z-index: 1; }
  .arc-media-view.is-active { display: block; }
  .arc-media-view img { width: 100%; height: 100%; object-fit: contain; padding: var(--space-s); }
  .arc-media-view--img { background: #fff; }      /* images read on white; 3D keeps the dark studio */
  .arc-media-view .arcstone-3d-viewer { aspect-ratio: auto; height: 100%; width: 100%; }
  .arc-product__stage .arcstone-3d-poster { mix-blend-mode: normal; }
  .arc-product__thumbs { display: flex; gap: .6rem; flex-wrap: wrap; }
  .arc-thumb { width: 4.5rem; height: 4.5rem; border: 1px solid var(--arc-line); background: #fff; padding: .3rem; cursor: pointer;
    display: grid; place-items: center; transition: border-color .2s; position: relative; }
  .arc-thumb--3d { background: var(--arc-panel); }   /* 3D tile stays dark so it stands apart */
  .arc-thumb img { width: 100%; height: 100%; object-fit: contain; }
  .arc-thumb.is-active, .arc-thumb:hover { border-color: var(--primary); }
  .arc-thumb--3d .arc-thumb__3dface { display: grid; place-items: center; gap: .15rem; font-family: var(--font-secondary);
    font-size: .62rem; font-weight: 600; letter-spacing: .12em; color: var(--primary); }
  .arc-thumb--3d svg { width: 1.5rem; height: 1.5rem; }

  /* image lightbox: dark backdrop, image on a white panel (shared corner token) */
  .arc-lightbox { position: fixed; inset: 0; z-index: 1000; display: grid; place-items: center;
    background: rgba(8, 8, 8, .92); -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px);
    padding: clamp(1rem, 4vw, 3rem); animation: arc-lb-in .18s ease; }
  .arc-lightbox[hidden] { display: none; }
  @keyframes arc-lb-in { from { opacity: 0; } to { opacity: 1; } }
  .arc-lightbox__panel { margin: 0; background: #fff; border-radius: var(--arc-media-radius);
    padding: clamp(.75rem, 2vw, 1.5rem); max-width: 92vw; max-height: 88vh; display: grid; place-items: center; }
  .arc-lightbox__img { display: block; width: auto; height: auto; max-width: 100%; max-height: calc(88vh - 3rem); object-fit: contain; }
  .arc-lightbox__close, .arc-lightbox__nav { position: absolute; display: grid; place-items: center;
    width: 2.9rem; height: 2.9rem; border: 0; border-radius: 999px; cursor: pointer; z-index: 1;
    background: rgba(255, 255, 255, .14); color: #fff; font-size: 1.7rem; line-height: 1;
    -webkit-backdrop-filter: blur(4px); backdrop-filter: blur(4px); transition: background .2s, color .2s; }
  .arc-lightbox__close:hover, .arc-lightbox__nav:hover { background: var(--primary); color: var(--on-primary, #1a1a1a); }
  .arc-lightbox__close:focus-visible, .arc-lightbox__nav:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
  .arc-lightbox__close { top: clamp(1rem, 3vw, 1.75rem); right: clamp(1rem, 3vw, 1.75rem); }
  .arc-lightbox__nav { top: 50%; transform: translateY(-50%); }
  .arc-lightbox__nav--prev { left: clamp(.75rem, 3vw, 1.75rem); }
  .arc-lightbox__nav--next { right: clamp(.75rem, 3vw, 1.75rem); }
  .arc-lightbox__count { position: absolute; bottom: clamp(.9rem, 3vw, 1.6rem); left: 50%; transform: translateX(-50%);
    color: var(--arc-white); font-family: var(--font-secondary); font-size: .78rem; letter-spacing: .14em; }
  @media (prefers-reduced-motion: reduce) { .arc-lightbox { animation: none; } }

  .arc-product__cat { font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .2em; font-size: .72rem; color: var(--primary); }
  .arc-product__title { font-size: var(--display-2); text-transform: uppercase; font-weight: 500; margin-top: .6rem; }
  .arc-product__lead { color: var(--text); margin-top: var(--space-m); font-size: var(--text-l); }
  .arc-product__actions { margin-top: var(--space-l); display: flex; flex-wrap: wrap; gap: var(--space-m); align-items: center; }

  /* ---- product datasheet / technical drawing (PDF) downloads ---- */
  .arc-pdfs {
    margin-top: var(--space-xl);
    display: grid; gap: .6rem; grid-template-columns: 1fr;
  }
  .arc-pdfs--2 { grid-template-columns: 1fr 1fr; }
  @media (max-width: 640px) { .arc-pdfs--2 { grid-template-columns: 1fr; } }
  .arc-pdf {
    display: flex; align-items: center; gap: var(--space-m);
    padding: 1rem 1.15rem; min-width: 0;
    background: var(--arc-panel); border: 1px solid var(--arc-line);
    transition: border-color .25s, transform .25s;
  }
  .arc-pdf:hover { border-color: rgba(255,200,2,.5); transform: translateY(-2px); }
  .arc-pdf:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
  .arc-pdf__badge {
    flex: none; width: 2.9rem; height: 2.9rem; display: grid; place-items: center;
    background: var(--primary); color: var(--on-primary);
  }
  .arc-pdf__badge svg { width: 1.5rem; height: 1.5rem; }
  .arc-pdf__body { display: flex; flex-direction: column; gap: .2rem; flex: 1; min-width: 0; }
  .arc-pdf__title {
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .1em;
    font-size: .95rem; font-weight: 500; color: var(--arc-white);
  }
  .arc-pdf__sub {
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .14em;
    font-size: .62rem; color: var(--text-soft);
  }
  .arc-pdf__dl {
    flex: none; width: 2.5rem; height: 2.5rem; border-radius: 50%;
    border: 1px solid var(--arc-line); display: grid; place-items: center;
    color: var(--arc-white); transition: background .25s, color .25s, border-color .25s;
  }
  .arc-pdf__dl svg { width: 1.1rem; height: 1.1rem; }
  .arc-pdf:hover .arc-pdf__dl { background: var(--primary); color: var(--on-primary); border-color: var(--primary); }

  .arc-spec { width: 100%; border-collapse: collapse; margin-top: var(--space-l); }
  .arc-spec th, .arc-spec td { text-align: left; padding: .85rem 0; border-bottom: 1px solid var(--arc-line); font-size: var(--text-s); }
  .arc-spec th { color: var(--text-soft); font-weight: 400; text-transform: uppercase; letter-spacing: .08em; width: 45%; }
  .arc-spec td { color: var(--arc-white); }

  .arc-block { margin-top: var(--space-xl); }
  .arc-block__title {
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .18em; font-size: .8rem;
    color: var(--arc-white); display: flex; align-items: center; gap: .8rem; margin-bottom: var(--space-s);
  }
  .arc-block__title::before { content:""; width: 1.6rem; height: 2px; background: var(--primary); }
  .arc-block__name { color: var(--arc-white); font-size: var(--text-l); }
  .arc-block__addr { color: var(--text); }
  .arc-block a { color: var(--primary); }
  .arc-product__desc { color: var(--text-soft); }
  .arc-product__desc p { margin-block: 0 var(--space-s); max-width: 65ch; }

  .arc-downloads { display: grid; gap: .5rem; margin-top: var(--space-m); }
  .arc-download { display: flex; align-items: center; gap: .9rem; padding: .9rem 1rem; border: 1px solid var(--arc-line);
    color: var(--arc-white); transition: border-color .2s, background .2s; }
  .arc-download:hover { border-color: var(--primary); background: rgba(255,255,255,.02); }
  .arc-download__ico { color: var(--primary); flex: none; }
  .arc-download small { color: var(--text-soft); display: block; font-size: .68rem; text-transform: uppercase; letter-spacing: .1em; }

  /* product-page: link to the full declarations overview (/kasulik) */
  .arc-pdfs__all { margin-top: var(--space-s); }
  .arc-pdfs__all a { display: inline-flex; align-items: center; gap: .5rem; color: var(--primary);
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .1em; font-size: .72rem; }
  .arc-pdfs__all a:hover { text-decoration: underline; text-underline-offset: .25em; }

  /* =========================================================================
     "KASULIK" / DOCUMENTS HUB
     ========================================================================= */
  .arc-doc-lead { color: var(--text-soft); max-width: 65ch; margin-bottom: var(--space-m); }
  .arc-docgrid { display: grid; gap: .6rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }

  /* declarations of performance overview table */
  .arc-dop { width: 100%; border-collapse: collapse; margin-top: var(--space-m); }
  .arc-dop thead th { text-align: left; padding: .7rem .6rem; border-bottom: 1px solid var(--arc-line);
    color: var(--text-soft); font-family: var(--font-secondary); font-weight: 400; text-transform: uppercase;
    letter-spacing: .12em; font-size: .66rem; }
  .arc-dop tbody td { text-align: left; padding: .9rem .6rem; border-bottom: 1px solid var(--arc-line);
    font-size: var(--text-s); vertical-align: middle; }
  .arc-dop td.code { font-family: var(--font-secondary); color: var(--primary); letter-spacing: .06em; white-space: nowrap; }
  .arc-dop td.name a { color: var(--arc-white); transition: color .2s; }
  .arc-dop td.name a:hover { color: var(--primary); }
  .arc-dop th.dl, .arc-dop td.dl { text-align: right; }
  .arc-dop__btn { display: inline-flex; align-items: center; gap: .5rem; color: var(--primary);
    font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .1em; font-size: .72rem; white-space: nowrap; }
  .arc-dop__btn svg { width: 1rem; height: 1rem; flex: none; }
  .arc-dop__btn:hover { text-decoration: underline; text-underline-offset: .25em; }
  .arc-dop__btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }
  @media (max-width: 600px) {
    .arc-dop thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
    .arc-dop tbody tr { display: block; padding: .7rem 0; border-bottom: 1px solid var(--arc-line); }
    .arc-dop tbody td { display: block; border: 0; padding: .15rem .6rem; }
    .arc-dop th.dl, .arc-dop td.dl { text-align: left; padding-top: .5rem; }
  }

  /* related */
  .arc-related { border-top: 1px solid var(--arc-line); }

  /* =========================================================================
     PROSE (pages, blog)
     ========================================================================= */
  .arc-prose { max-width: 70ch; color: var(--text); }
  .arc-prose > * + * { margin-top: var(--space-m); }
  .arc-prose h2 { font-size: var(--display-3); text-transform: uppercase; margin-top: var(--space-xl); }
  .arc-prose > :first-child { margin-top: 0; }
  a[href^="tel:"], a[href^="mailto:"] { white-space: nowrap; }
  .arc-prose h3 { font-size: var(--text-xl); text-transform: uppercase; margin-top: var(--space-l); }
  .arc-prose a { color: var(--primary); text-decoration: underline; text-underline-offset: .2em; }
  .arc-prose ul, .arc-prose ol { padding-left: 1.2rem; }
  .arc-prose img { border: 1px solid var(--arc-line); }
  .arc-prose blockquote { border-left: 2px solid var(--primary); padding-left: var(--space-m); color: var(--text-soft); font-style: italic; }

  /* =========================================================================
     FORMS (quote / contact)
     ========================================================================= */
  .arc-form { display: grid; gap: var(--space-m); grid-template-columns: 1fr; }
  .arc-form__row { display: grid; gap: var(--space-m); grid-template-columns: 1fr; }
  .arc-field { display: flex; flex-direction: column; gap: .4rem; }
  .arc-field label { font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .12em; font-size: .68rem; color: var(--text-soft); }
  .arc-input, .arc-textarea, .arc-select {
    background: var(--arc-panel); border: 1px solid var(--arc-line); color: var(--arc-white);
    padding: .9rem 1rem; font-family: var(--font-primary); font-size: var(--text-s); border-radius: 0; width: 100%;
    transition: border-color .2s;
  }
  .arc-input:focus, .arc-textarea:focus, .arc-select:focus { outline: 0; border-color: var(--primary); }
  .arc-textarea { min-height: 8rem; resize: vertical; }
  .arc-form__note { font-size: var(--text-xs); color: var(--text-soft); }
  .arc-form__note a { color: var(--primary); }

  /* honeypot — kept out of the layout + off-screen, never display:none
     (some bots skip display:none fields) */
  .arc-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

  .arc-form__status {
    font-size: var(--text-s); padding: .85rem 1rem; border-left: 3px solid var(--arc-line);
    background: var(--arc-panel); color: var(--arc-white); margin: 0;
  }
  .arc-form__status.is-ok  { border-left-color: var(--primary); }
  .arc-form__status.is-err { border-left-color: #e5534b; }

  /* =========================================================================
     FOOTER
     ========================================================================= */
  .arc-footer { background: #0d0d0d; border-top: 1px solid var(--arc-line); position: relative; z-index: 1; }
  .arc-footer__eu { border-bottom: 1px solid var(--arc-line); }
  .arc-footer__eu-inner { display: grid; gap: var(--space-l); grid-template-columns: 1fr; align-items: center; padding-block: var(--space-l); }
  .arc-footer__eu-flag { font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .14em; color: var(--primary); font-size: .8rem; }
  .arc-footer__eu p { color: var(--text-soft); font-size: var(--text-s); margin: .4rem 0 0; max-width: none; }

  .arc-footer__main { display: grid; gap: var(--space-xl); grid-template-columns: 1fr; padding-block: clamp(2.5rem, 5vw, 4rem); }
  .arc-footer__col h4, .arc-footer__col .arc-footer__h { font-family: var(--font-secondary); text-transform: uppercase; letter-spacing: .16em; font-size: .78rem; color: var(--arc-white); margin-bottom: var(--space-m); }
  .arc-footer__col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .6rem; }
  .arc-footer__col a, .arc-footer__col li { color: var(--text-soft); font-size: var(--text-s); transition: color .2s; }
  .arc-footer__col a:hover { color: var(--primary); }
  .arc-footer__brand .arc-brand { font-size: 1.8rem; }
  .arc-footer__brand .arc-brand img { height: 2.5rem; }
  .arc-footer__brand p { color: var(--text-soft); font-size: var(--text-s); margin-top: var(--space-m); max-width: 34ch; }
  .arc-footer__bar { border-top: 1px solid var(--arc-line); padding-block: var(--space-m); display: flex; flex-wrap: wrap; gap: var(--space-s) var(--space-l); justify-content: space-between; align-items: center; }
  .arc-footer__bar, .arc-footer__bar a { color: var(--arc-dim); font-size: var(--text-xs); }
  .arc-footer__bar a:hover { color: var(--primary); }
  /* narrow mobile: the bar wraps to a stack — float the switcher to the top */
  @media (max-width: 560px) {
    .arc-footer__bar { justify-content: flex-start; }
    .arc-footer__bar .arc-lang--footer { order: -1; }
  }

  /* =========================================================================
     404
     ========================================================================= */
  .arc-404 { min-height: 70vh; display: grid; place-items: center; text-align: center; padding-top: var(--arc-header-h); }
  .arc-404__code { font-family: var(--font-secondary); font-weight: 700; font-size: clamp(6rem, 22vw, 16rem); line-height: .8;
    color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,.25); }
  .arc-404__code b { color: var(--primary); -webkit-text-stroke: 0; }

  /* =========================================================================
     REVEAL ANIMATION
     ========================================================================= */
  /* Only hide when JS is confirmed (html.js set in <head>), so content is
     never permanently invisible if the observer/script fails to run. */
  html.js [data-reveal] { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
  html.js [data-reveal].is-in { opacity: 1; transform: none; }
  @media (prefers-reduced-motion: reduce) {
    html.js [data-reveal] { opacity: 1; transform: none; transition: none; }
    html { scroll-behavior: auto; }
  }

  /* =========================================================================
     RESPONSIVE
     ========================================================================= */
  @media (min-width: 600px) {
    .arc-cats { grid-template-columns: repeat(2, 1fr); }
    .arc-form__row { grid-template-columns: 1fr 1fr; }
    .arc-footer__eu-inner { grid-template-columns: auto 1fr; gap: var(--space-xl); }
  }

  @media (min-width: 900px) {
    .arc-nav { display: block; }
    .arc-header__inner { gap: var(--space-l); }
    .arc-header__cta {
      margin-left: 0;
      font-size: 0.9rem; letter-spacing: 0.16em;
      padding: 0.95rem 1.7rem; gap: 0.7rem;
    }
    .arc-burger { display: none; }
    .arc-lang { display: inline-flex; }
    .arc-lang--mobile { display: none; }
    .arc-hero__scroll { display: flex; }

    .arc-about__grid { grid-template-columns: 1.1fr 0.9fr; }
    .arc-about__grid--media3 { grid-template-columns: 1fr 1fr 1fr; }
    .arc-split { grid-template-columns: 1fr 1fr; }
    .arc-product { grid-template-columns: 1.05fr 0.95fr; gap: var(--space-2xl); }
    .arc-cats { grid-template-columns: repeat(2, 1fr); }
    .arc-footer__main { grid-template-columns: 1.4fr 1fr 1fr 1.2fr; }
  }

  @media (min-width: 1100px) {
    .arc-cats--3 { grid-template-columns: repeat(3, 1fr); }
  }

  @media (min-width: 1280px) {
    .arc-rail { display: flex; }
    body { padding-left: var(--arc-rail-w); }
    .arc-header { padding-left: var(--arc-rail-w); }
    .arc-mobile { padding-left: calc(var(--arc-rail-w) + var(--space-l)); }
    /* lines sit in the rail-framed content area, matching .arc-container */
    .arc-lines { left: var(--arc-rail-w); }
  }
}