/* ============================================================
   BoChang Metal — new site stylesheet
   Implements 视觉设计规范 v1.0 (§1 colour, §2 type, §3 grid,
   §4 radius/shadow, §5 buttons & forms, §6 cards, §7 hero).
   Single stylesheet, no build step, no framework.
   ============================================================ */

/* ---------- 0. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- 1. Tokens (§11 verbatim + additions) ---------- */
:root {
  /* color */
  --ink: #1F1C18;  --ink-2: #4A443C;  --ink-3: #7A7266;
  --sand-50: #FAF7F2; --sand-100: #F3EADB; --sand-200: #E7D9C6; --sand-300: #D7C5AF;
  --accent: #C8763E; --accent-soft: #F6E6D8;
  --steel: #7C858C; --line: #E2D8C9; --white: #fff;
  --success: #3E7A57; --warning: #B4761F; --error: #A8402E;
  --card-line: #EFE7DA;

  /* gradient */
  --grad-sand:  linear-gradient(160deg, #FAF7F2 0%, #E7D9C6 100%);
  --grad-plate: radial-gradient(120% 90% at 30% 20%, #F7EEE2 0%, #E3D2BB 100%);

  /* type */
  --font-display: "Fraunces", "Noto Serif SC", Georgia, serif;
  --font-sans: "Manrope", "Noto Sans SC", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  /* space */
  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px; --sp-5: 24px;
  --sp-6: 32px; --sp-7: 48px; --sp-8: 64px; --sp-9: 96px; --sp-10: 128px; --sp-11: 160px;

  /* layout */
  --container: 1680px;
  --gutter: clamp(20px, 6.25vw, 120px);
  --col-gap: 24px;

  /* radius & shadow */
  --r-xs: 2px; --r-sm: 6px; --r-md: 10px; --r-lg: 16px;
  --shadow-1: 0 1px 2px rgba(31,28,24,.06), 0 2px 6px rgba(31,28,24,.04);
  --shadow-2: 0 2px 6px rgba(31,28,24,.06), 0 12px 28px rgba(31,28,24,.08);
  --shadow-3: 0 24px 60px rgba(31,28,24,.14);

  /* type scale (§2.3) */
  --fs-display-xl: clamp(40px, 5.6vw, 108px);
  --fs-display-l: clamp(32px, 3.4vw, 64px);
  --fs-display-m: clamp(26px, 2.4vw, 44px);
  --fs-h3: 22px;
  --fs-card-title: 26px;
  --fs-lead: clamp(20px, 1.35vw, 26px);
  --fs-body-l: 18px;
  --fs-body: 16px;
  --fs-body-s: 14px;
  --fs-label: 13px;
  --fs-mono-label: 11px;
}

/* ---------- 2. Base ---------- */
[id] { scroll-margin-top: 104px; }
body {
  background: var(--sand-50); color: var(--ink-2);
  font: 400 16px/1.7 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { color: var(--ink); margin: 0; font-weight: 600; }
a { color: inherit; text-decoration: none; }
p { max-width: 68ch; }
strong { color: var(--ink); font-weight: 700; }

.container {
  width: min(100% - var(--gutter) * 2, var(--container));
  margin-inline: auto;
}

.skip-link {
  position: absolute; left: 0; top: 0; z-index: 100; transform: translateY(-120%);
  background: var(--ink); color: #fff; padding: 12px 20px;
  font: 700 13px/1 var(--font-sans); letter-spacing: .08em; text-transform: uppercase;
}
.skip-link:focus { transform: none; }

.mono-label {
  font: 500 11px/1.2 var(--font-mono);
  letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3);
}
.eyebrow {
  font: 700 13px/1.2 var(--font-sans);
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3);
}
.section-title {
  font: 600 var(--fs-display-l)/1.08 var(--font-display);
  letter-spacing: -.015em; color: var(--ink);
}
.section-lead {
  font: 400 var(--fs-body-l)/1.65 var(--font-sans);
  color: var(--ink-2); margin-top: var(--sp-4); max-width: 62ch;
}
.tbc {
  font: 500 12px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-3); border-bottom: 1px dashed var(--sand-300);
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- 3. Header + navigation ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(250,247,242,.94);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header__bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-6); height: 88px;
}
.brand {
  display: inline-flex; align-items: center; gap: 12px;
  font: 600 22px/1 var(--font-display); letter-spacing: -.01em; color: var(--ink);
  flex: 0 0 auto;
}
.brand__mark {
  width: 34px; height: 34px; border: 1.5px solid var(--ink); border-radius: var(--r-xs);
  display: inline-flex; align-items: center; justify-content: center;
  font: 500 11px/1 var(--font-mono); letter-spacing: .06em;
}
.brand__sub {
  display: block; font: 500 10px/1.4 var(--font-mono); letter-spacing: .18em;
  text-transform: uppercase; color: var(--ink-3); margin-top: 4px;
}
.brand__text { display: flex; flex-direction: column; }

.nav { display: flex; align-items: center; gap: var(--sp-6); margin-left: auto; }
.nav__link, .nav__trigger {
  font: 500 15px/1 var(--font-sans); color: var(--ink-2);
  padding: 10px 0; display: inline-flex; align-items: center; gap: 6px;
  border-bottom: 1px solid transparent; cursor: pointer;
}
.nav__link:hover, .nav__trigger:hover, .nav__link[aria-current="page"] { color: var(--ink); border-bottom-color: var(--ink); }
.nav__trigger[aria-expanded="true"] { color: var(--ink); border-bottom-color: var(--ink); }
.nav__caret { width: 8px; height: 8px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translateY(-2px); }
.nav__item { position: static; }

.nav__cta { margin-left: var(--sp-4); }

/* mega menu */
.mega {
  position: absolute; left: 0; right: 0; top: 100%;
  background: var(--sand-50); border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow-2);
  padding: var(--sp-8) 0 var(--sp-9);
  display: none;
}
.mega.is-open { display: block; }
.mega__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-7) var(--sp-6); }
.mega__col-title {
  font: 500 11px/1.2 var(--font-mono); letter-spacing: .2em; text-transform: uppercase;
  color: var(--ink-3); padding-bottom: 12px; border-bottom: 1px solid var(--line); margin-bottom: 12px;
}
.mega__col-title a:hover { color: var(--ink); }
.mega__list a {
  display: block; padding: 7px 0; font: 400 15px/1.35 var(--font-sans); color: var(--ink-2);
}
.mega__list a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.mega__foot {
  margin-top: var(--sp-7); padding-top: var(--sp-5); border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; gap: var(--sp-5); flex-wrap: wrap;
  font: 400 14px/1.6 var(--font-sans); color: var(--ink-3);
}

/* mobile nav toggle */
.nav-toggle {
  display: none; width: 44px; height: 44px; align-items: center; justify-content: center;
  border: 1px solid var(--line); border-radius: var(--r-xs); background: #fff;
}
.nav-toggle__bars { position: relative; width: 20px; height: 2px; background: var(--ink); display: block; }
.nav-toggle__bars::before, .nav-toggle__bars::after {
  content: ""; position: absolute; left: 0; width: 20px; height: 2px; background: var(--ink);
  transition: transform .2s ease, top .2s ease;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.site-header.is-open .nav-toggle__bars { background: transparent; }
.site-header.is-open .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.site-header.is-open .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* ---------- 4. Hero (§7) ---------- */
.hero { position: relative; background: var(--grad-sand); overflow: hidden; }
.hero > .container { height: 100%; }
.hero__media { position: absolute; inset: 0 0 0 45%; }
.hero__inner {
  position: relative; height: 100%; display: flex; flex-direction: column; justify-content: center;
  max-width: 740px; padding-block: clamp(56px, 8vh, 120px);
}
.hero__eyebrow { font: 700 18px/1 var(--font-sans); letter-spacing: .18em; text-transform: uppercase; color: var(--ink-2); }
.hero h1 {
  font: 600 var(--fs-display-xl)/1.05 var(--font-display);
  letter-spacing: -.02em; color: var(--ink); margin: 36px 0 0;
}
.hero h1 span { display: block; }
.hero__lead { font: 400 var(--fs-lead)/1.55 var(--font-sans); color: var(--ink-2); margin: 29px 0 0; max-width: 705px; }
.hero__cta { display: flex; gap: 20px; margin-top: 41px; flex-wrap: wrap; }

@media (min-width: 1440px) {
  .hero { aspect-ratio: 1920 / 900; max-height: 900px; }
}
@media (min-width: 1024px) and (max-width: 1439px) {
  .hero { min-height: 640px; }
  .hero__media { inset: 0 0 0 38%; }
  .hero__media::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(90deg, rgba(250,247,242,.96) 0%, rgba(250,247,242,.72) 38%, rgba(250,247,242,.12) 72%);
  }
  .hero h1 { font-size: clamp(44px, 4.4vw, 64px); }
}

/* hero media placeholder — replace .hero__media background with the
   1920×900 WebP once the factory shoot is delivered (§2.7, §7.4) */
.hero__media--placeholder { background: var(--grad-plate); }
.hero__media--placeholder::before {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(90deg, #FAF7F2 0%, rgba(250,247,242,.72) 5%, rgba(250,247,242,0) 24%),
    radial-gradient(60% 45% at 72% 28%, rgba(255,250,240,.85) 0%, rgba(255,250,240,0) 70%),
    linear-gradient(155deg, rgba(31,28,24,0) 45%, rgba(31,28,24,.10) 100%);
}
.hero__media--placeholder::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(122,114,102,.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(122,114,102,.16) 1px, transparent 1px);
  background-size: 120px 120px;
  mask-image: linear-gradient(200deg, rgba(0,0,0,.65), rgba(0,0,0,0) 75%);
  -webkit-mask-image: linear-gradient(200deg, rgba(0,0,0,.65), rgba(0,0,0,0) 75%);
}
.media-tag {
  position: absolute; right: var(--sp-5); bottom: var(--sp-5); z-index: 2;
  font: 500 10px/1.5 var(--font-mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--ink-3); background: rgba(250,247,242,.82);
  border: 1px solid var(--line); border-radius: var(--r-xs); padding: 7px 10px; max-width: 70%;
}

/* trust strip under hero (§2.4 screen 1 + §8.3 grey band) */
.trust-strip { background: var(--sand-50); border-bottom: 1px solid var(--line); }
.trust-strip__inner {
  display: flex; flex-wrap: wrap; gap: var(--sp-5) var(--sp-9);
  padding: var(--sp-5) 0; align-items: center;
}
.trust-strip__item { display: flex; align-items: baseline; gap: 10px; }
.trust-strip__value { font: 500 13px/1.2 var(--font-mono); color: var(--ink); letter-spacing: .04em; }
.trust-strip__label { font: 400 13px/1.4 var(--font-sans); color: var(--ink-3); }
.trust-strip__note { margin-left: auto; }

/* ---------- 5. Generic section rhythm (§3.3) ---------- */
.section { padding-block: clamp(56px, 6vw, 128px); }
.section--tight { padding-block: clamp(40px, 4vw, 72px); }
.section--sand { background: var(--sand-100); }
.section--dark { background: var(--ink); color: rgba(250,247,242,.78); }
.section--dark h2, .section--dark h3 { color: var(--sand-50); }
.section--dark .section-lead { color: rgba(250,247,242,.72); }
.section--dark .mono-label, .section--dark .eyebrow { color: var(--sand-300); }
.section--edge { border-top: 1px solid var(--line); }

.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--sp-6); flex-wrap: wrap; margin-bottom: var(--sp-7); }
.section-head__meta { max-width: 62ch; }
.section-head__meta > .mono-label { display: block; margin-bottom: 12px; }
.section-head__meta > .section-title + .section-lead { margin-top: 14px; }
.section-head__aside { max-width: 100%; }
.section-head__aside { display: flex; align-items: center; gap: var(--sp-4); flex-wrap: wrap; }
.section-index { color: var(--accent); margin-right: 12px; }

.link-arrow {
  font: 700 13px/1 var(--font-sans); letter-spacing: .08em; text-transform: uppercase;
  color: var(--ink); border-bottom: 1px solid var(--ink); padding-bottom: 4px;
  display: inline-block; white-space: nowrap;
}
.link-arrow:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- 6. Buttons (§5.1) ---------- */
.btn {
  --btn-h: 48px;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: var(--btn-h); padding-inline: 28px;
  font: 700 15px/1 var(--font-sans); letter-spacing: .01em;
  border-radius: var(--r-xs); border: 1px solid transparent;
  cursor: pointer; text-decoration: none;
  transition: background-color .22s ease, color .22s ease, border-color .22s ease, transform .22s ease;
}
.btn--primary  { background: var(--ink); color: #fff; }
.btn--primary:hover { background: #2E2823; }
.btn--secondary { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn--secondary:hover { background: var(--sand-100); }
.btn--lg { --btn-h: 64px; padding-inline: 48px; font-size: 17px; }
.btn--sm { --btn-h: 40px; padding-inline: 20px; font-size: 14px; }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn[disabled] { opacity: .45; pointer-events: none; }
.btn.is-pending {
  opacity: .55; border-style: dashed; cursor: not-allowed;
  color: var(--ink-3); border-color: var(--sand-300); background: transparent;
}
.section--dark .btn--secondary { color: var(--sand-50); border-color: var(--sand-300); }
.section--dark .btn--secondary:hover { background: rgba(250,247,242,.08); }
.section--dark .btn--primary { background: var(--sand-50); color: var(--ink); }
.section--dark .btn--primary:hover { background: #fff; }

/* ---------- 7. Category card (§6.1, §11) ---------- */
.cat-group { margin-top: var(--sp-9); }
.cat-group:first-of-type { margin-top: 0; }
.cat-group__head {
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--sp-5);
  padding-bottom: var(--sp-4); border-bottom: 1px solid var(--line); margin-bottom: var(--sp-6);
  flex-wrap: wrap;
}
.cat-group__title { font: 600 var(--fs-display-m)/1.12 var(--font-display); letter-spacing: -.01em; color: var(--ink); }
.cat-group__title .cat-group__num { font: 500 12px/1 var(--font-mono); letter-spacing: .2em; color: var(--accent); margin-right: 14px; vertical-align: 6px; }
.cat-group__note { font: 400 14px/1.6 var(--font-sans); color: var(--ink-3); max-width: 46ch; }

.cat-grid {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--sp-6) var(--col-gap);
}
.cat-grid--11 { grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--sp-8) var(--col-gap); }
.cat-grid--11 > .cat-card { grid-column: span 4; }

.cat-card { display: block; text-decoration: none; color: inherit; }
.cat-card__media {
  position: relative; aspect-ratio: 4 / 3; border-radius: var(--r-md);
  overflow: hidden; background: var(--grad-plate);
  border: 1px solid var(--card-line);
}
.cat-card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s cubic-bezier(.2,.7,.2,1); }
.cat-card:hover .cat-card__media img { transform: scale(1.03); }
.cat-card__body { padding: 18px 2px 0; }
.cat-card__eyebrow { font: 500 11px/1.2 var(--font-mono); letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); }
.cat-card__title {
  font: 600 26px/1.15 var(--font-display); letter-spacing: -.01em; color: var(--ink);
  margin: 10px 0 0; padding-top: 14px; border-top: 2px solid var(--accent); display: inline-block;
}
.cat-card:hover .cat-card__title { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 5px; }
.cat-card__desc { font: 400 14px/1.55 var(--font-sans); color: var(--ink-2); margin: 10px 0 0; max-width: 32ch; }
.cat-card__more { font: 700 12px/1 var(--font-sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin-top: 14px; display: inline-flex; gap: 8px; }
.cat-card:hover .cat-card__more { color: var(--ink); }

/* placeholder media used until product photos land (§9.1) */
.ph { position: relative; overflow: hidden; background: var(--grad-plate); }
.ph::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(122,114,102,.13) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(122,114,102,.13) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: linear-gradient(200deg, rgba(0,0,0,.6), rgba(0,0,0,.12));
  -webkit-mask-image: linear-gradient(200deg, rgba(0,0,0,.6), rgba(0,0,0,.12));
}
.ph__ghost {
  position: absolute; right: 14px; bottom: 2px;
  font: 500 clamp(40px, 4.5vw, 78px)/1 var(--font-mono);
  color: rgba(31,28,24,.07); letter-spacing: -.02em;
}
.ph__tag {
  position: absolute; left: 14px; top: 14px;
  font: 500 9.5px/1 var(--font-mono); letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-3); background: rgba(250,247,242,.7);
  border-radius: var(--r-xs); padding: 5px 7px;
}
.ph__name {
  position: absolute; left: 14px; right: 14px; bottom: 14px;
  font: 600 15px/1.2 var(--font-display); color: rgba(31,28,24,.32); letter-spacing: -.01em;
}
.hero .ph__name, .cat-card .ph__name { display: none; }

/* ---------- 8. Project lines (screen 3) ---------- */
.lines { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--col-gap); }
.line-card {
  position: relative; display: flex; flex-direction: column;
  background: var(--sand-50); border: 1px solid var(--card-line); border-radius: var(--r-md);
  overflow: hidden; box-shadow: var(--shadow-1);
  transition: box-shadow .3s ease, transform .3s ease;
}
.line-card:hover { box-shadow: var(--shadow-2); transform: translateY(-2px); }
.line-card__media { aspect-ratio: 16 / 10; }
.line-card__body { padding: var(--sp-6) var(--sp-5) var(--sp-5); display: flex; flex-direction: column; gap: 10px; flex: 1; }
.line-card__title { font: 600 26px/1.15 var(--font-display); letter-spacing: -.01em; color: var(--ink); }
.line-card__text { font: 400 15px/1.6 var(--font-sans); color: var(--ink-2); }
.line-card__list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 2px; }
.line-card__list li {
  font: 500 11px/1.4 var(--font-mono); letter-spacing: .06em; text-transform: uppercase;
  color: var(--ink-2); background: var(--sand-100); border-radius: var(--r-xs); padding: 5px 7px;
}
.line-card__foot { margin-top: auto; padding-top: var(--sp-4); }

/* ---------- 9. Stats / factory proof (screen 4, §8.4) ---------- */
.proof { display: grid; grid-template-columns: 1fr 1.15fr; gap: var(--sp-9); align-items: start; }
.proof__stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-7) var(--sp-6); }
.stat { border-top: 1px solid rgba(250,247,242,.18); padding-top: var(--sp-4); }
.stat__value { font: 500 clamp(28px, 2.6vw, 40px)/1.1 var(--font-mono); color: var(--sand-50); letter-spacing: -.01em; }
.stat__value.is-tbc { color: var(--sand-300); font-size: clamp(20px, 1.8vw, 26px); letter-spacing: .1em; }
.stat__line { width: 24px; height: 2px; background: var(--accent); margin: var(--sp-3) 0 var(--sp-2); }
.stat__label { font: 700 13px/1.2 var(--font-sans); letter-spacing: .1em; text-transform: uppercase; color: var(--sand-300); }
.proof__media { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-3); }
.proof__media .ph { border-radius: var(--r-sm); aspect-ratio: 3 / 2; }
.proof__media .ph:first-child { grid-column: span 2; }
.footnote { font: 400 13px/1.6 var(--font-sans); color: var(--ink-3); margin-top: var(--sp-5); }
.section--dark .footnote { color: rgba(250,247,242,.5); }

/* ---------- 10. OEM process (screen 5) ---------- */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--col-gap); counter-reset: step; }
.step { padding-top: var(--sp-5); border-top: 2px solid var(--ink); position: relative; }
.step__num { font: 500 11px/1 var(--font-mono); letter-spacing: .2em; color: var(--accent); }
.step__title { font: 600 22px/1.25 var(--font-display); color: var(--ink); margin: var(--sp-3) 0 var(--sp-2); }
.step__text { font: 400 14.5px/1.65 var(--font-sans); color: var(--ink-2); }
.step::after {
  content: "→"; position: absolute; right: -18px; top: var(--sp-4);
  color: var(--sand-300); font: 500 16px/1 var(--font-mono);
}
.step:last-child::after { display: none; }

/* ---------- 11. Certification band (screen 6, §8.3) ---------- */
.cert-band { display: flex; flex-wrap: wrap; gap: var(--sp-6) var(--sp-7); align-items: center; }
.cert {
  display: flex; align-items: center; gap: 12px; padding: 10px 0;
  color: var(--ink-3); border-bottom: 1px dashed var(--sand-300);
}
.cert__mark {
  width: 30px; height: 30px; border: 1.5px solid currentColor; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font: 500 9px/1 var(--font-mono); letter-spacing: .02em;
}
.cert__meta { display: flex; flex-direction: column; gap: 2px; }
.cert__name { font: 700 13px/1.2 var(--font-sans); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); }
.cert__id { font: 500 11px/1.2 var(--font-mono); letter-spacing: .08em; color: var(--ink-3); }

/* ---------- 12. Case cards (screen 7) ---------- */
.cases { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--col-gap); }
.case-card { display: block; border-top: 2px solid var(--ink); padding-top: var(--sp-4); }
.case-card__media { aspect-ratio: 4 / 3; border-radius: var(--r-md); margin-bottom: var(--sp-4); }
.case-card__kicker { font: 500 11px/1.2 var(--font-mono); letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); }
.case-card__title { font: 600 24px/1.2 var(--font-display); color: var(--ink); margin: var(--sp-3) 0 var(--sp-2); }
.case-card__text { font: 400 14.5px/1.6 var(--font-sans); color: var(--ink-2); }
.case-card__meta { font: 500 11px/1.4 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--steel); margin-top: var(--sp-3); }

/* ---------- 13. Resources (screen 8) ---------- */
.resources { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--col-gap); }
.resource {
  display: flex; gap: var(--sp-5); align-items: center;
  background: var(--sand-50); border: 1px solid var(--card-line); border-radius: var(--r-md);
  padding: var(--sp-5); box-shadow: var(--shadow-1);
}
.resource__cover { width: 84px; aspect-ratio: 3 / 4; flex: 0 0 auto; border-radius: var(--r-sm); }
.resource__title { font: 600 20px/1.25 var(--font-display); color: var(--ink); }
.resource__meta { font: 500 11px/1.4 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-top: 6px; }
.resource__body { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }

/* ---------- 14. FAQ (screen 9) ---------- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-5);
  padding: var(--sp-5) 0; cursor: pointer; list-style: none;
  font: 600 20px/1.4 var(--font-display); color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font: 400 22px/1 var(--font-mono); color: var(--accent); flex: 0 0 auto;
}
.faq details[open] summary::after { content: "−"; }
.faq__answer { padding: 0 0 var(--sp-5); max-width: 78ch; font: 400 16px/1.7 var(--font-sans); color: var(--ink-2); }

/* ---------- 15. Quote band (screen 10) ---------- */
.quote-band { background: var(--sand-100); border-top: 1px solid var(--line); }
.quote-band__grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-9); align-items: start; }
.quote-band__side { max-width: 46ch; }

/* ---------- 16. Forms (§5.2) ---------- */
.form { display: grid; gap: 20px; }
.form__row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.form__group { display: grid; gap: 20px; }
.form__divider { border: 0; border-top: 1px solid var(--line); margin: 12px 0; }
.field { display: grid; gap: 8px; }
.field > label {
  font: 700 13px/1.2 var(--font-sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-2);
}
.field .req { color: var(--accent); margin-left: 3px; }
.field > label .field__hint { text-transform: none; letter-spacing: 0; font-weight: 400; color: var(--ink-3); }
.field input, .field select, .field textarea {
  height: 48px; padding: 0 14px; font: 400 16px/1.5 var(--font-sans);
  color: var(--ink); background: #fff; width: 100%;
  border: 1px solid var(--line); border-radius: var(--r-xs);
  transition: border-color .18s ease, box-shadow .18s ease;
}
.field select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--ink-3) 50%), linear-gradient(135deg, var(--ink-3) 50%, transparent 50%); background-position: calc(100% - 18px) 21px, calc(100% - 13px) 21px; background-size: 5px 5px, 5px 5px; background-repeat: no-repeat; padding-right: 40px; }
.field textarea { height: auto; min-height: 132px; padding: 12px 14px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px var(--accent-soft);
}
.field input[type="file"] { height: auto; padding: 12px 14px; font-size: 14px; }
.field--error input, .field--error select, .field--error textarea { border-color: var(--error); }
.field__hint { font: 400 13px/1.5 var(--font-sans); color: var(--ink-3); }
.field__error { font: 400 13px/1.5 var(--font-sans); color: var(--error); display: none; }
.field--error .field__error { display: block; }
.form__foot { display: flex; align-items: center; gap: var(--sp-5); flex-wrap: wrap; }
.form__notice { font: 400 13px/1.6 var(--font-sans); color: var(--ink-3); max-width: 40ch; }
.form__status { font: 400 14px/1.6 var(--font-sans); color: var(--success); }

/* ---------- 17. Footer (screen 11) ---------- */
.site-footer { background: var(--ink); color: rgba(250,247,242,.66); padding-block: var(--sp-9) var(--sp-6); }
.site-footer a { color: rgba(250,247,242,.66); }
.site-footer a:hover { color: var(--sand-50); }
.footer__grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1.2fr; gap: var(--sp-8) var(--sp-6); }
.footer__brand { font: 600 24px/1.2 var(--font-display); color: var(--sand-50); }
.footer__brand-sub { font: 500 10px/1.5 var(--font-mono); letter-spacing: .18em; text-transform: uppercase; color: var(--sand-300); margin-top: 8px; }
.footer__about { font: 400 14px/1.7 var(--font-sans); margin-top: var(--sp-4); max-width: 34ch; }
.footer__attrib { font: 400 13px/1.7 var(--font-sans); color: rgba(250,247,242,.5); margin-top: var(--sp-3); max-width: 38ch; }
.footer__attrib a { color: rgba(250,247,242,.62); border-bottom: 1px solid rgba(250,247,242,.22); }
.footer__attrib a:hover { color: var(--sand-50); border-bottom-color: var(--sand-300); }
.footer__col-title { font: 500 11px/1.2 var(--font-mono); letter-spacing: .2em; text-transform: uppercase; color: var(--sand-300); margin-bottom: var(--sp-4); }
.footer__list li + li { margin-top: 9px; }
.footer__list a, .footer__list span { font: 400 14px/1.5 var(--font-sans); }
.footer__contact-row { display: grid; grid-template-columns: 84px 1fr; gap: 10px; font: 400 14px/1.6 var(--font-sans); }
.footer__contact-row dt { font: 500 11px/1.9 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--sand-300); }
.footer__contact-row dd { margin: 0; }
.footer__bottom {
  margin-top: var(--sp-8); padding-top: var(--sp-5); border-top: 1px solid rgba(250,247,242,.14);
  display: flex; justify-content: space-between; gap: var(--sp-4); flex-wrap: wrap;
  font: 400 13px/1.6 var(--font-sans); color: rgba(250,247,242,.45);
}

/* ---------- 18. Breadcrumb + page heads ---------- */
.breadcrumb { padding: var(--sp-5) 0 0; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font: 500 11px/1.4 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.breadcrumb li { display: inline-flex; gap: 8px; align-items: center; }
.breadcrumb li + li::before { content: "/"; color: var(--sand-300); }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb [aria-current="page"] { color: var(--ink-2); }

.page-head { padding-block: var(--sp-7) var(--sp-8); border-bottom: 1px solid var(--line); }
.page-head__grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: var(--sp-8); align-items: end; }
.page-head h1 { font: 600 var(--fs-display-l)/1.06 var(--font-display); letter-spacing: -.015em; max-width: 24ch; }
.page-head__lead { font: 400 var(--fs-body-l)/1.65 var(--font-sans); color: var(--ink-2); margin-top: var(--sp-5); max-width: 56ch; }
.page-head__facts { display: grid; gap: var(--sp-4); border-left: 1px solid var(--line); padding-left: var(--sp-6); }
.fact { display: grid; gap: 3px; }
.fact__k { font: 500 11px/1.2 var(--font-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); }
.fact__v { font: 400 15px/1.5 var(--font-sans); color: var(--ink); }

/* ---------- 19. Category page blocks (§2.5) ---------- */
.gallery { display: grid; grid-template-columns: 1.55fr 1fr; gap: var(--sp-4); align-items: stretch; }
.gallery__main { aspect-ratio: 4 / 3; border-radius: var(--r-md); border: 1px solid var(--card-line); }
.gallery__side { display: grid; gap: var(--sp-4); grid-template-rows: repeat(3, 1fr); }
.gallery__side .ph { aspect-ratio: auto; height: 100%; min-height: 92px; border-radius: var(--r-sm); border: 1px solid var(--card-line); }
.gallery__caption { font: 400 13px/1.6 var(--font-sans); color: var(--ink-3); margin-top: var(--sp-3); }

.spec-table { width: 100%; border-top: 2px solid var(--ink); }
.spec-table th, .spec-table td { text-align: left; padding: 15px 16px 15px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec-table th {
  font: 700 12px/1.4 var(--font-sans); letter-spacing: .08em; text-transform: uppercase;
  color: var(--ink-2); width: 34%;
}
.spec-table td { font: 400 15px/1.6 var(--font-sans); color: var(--ink); }
.spec-table td .unit { color: var(--ink-3); font: 500 12px/1.4 var(--font-mono); }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-9); align-items: start; }
.option-list { display: grid; gap: var(--sp-4); }
.option { display: grid; grid-template-columns: 118px 1fr; gap: var(--sp-4); padding-bottom: var(--sp-4); border-bottom: 1px solid var(--line); }
.option__k { font: 500 11px/1.6 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.option__v { font: 400 15px/1.65 var(--font-sans); color: var(--ink-2); }
.option__v b { color: var(--ink); font-weight: 700; }

.points { display: grid; gap: 10px; margin-top: var(--sp-5); }
.points li {
  position: relative; padding-left: 24px;
  font: 400 15px/1.6 var(--font-sans); color: var(--ink-2);
}
.points li::before { content: "—"; position: absolute; left: 0; color: var(--accent); }

.scene-list { display: grid; gap: var(--sp-3); }
.scene { display: flex; gap: var(--sp-4); align-items: baseline; }
.scene__i { font: 500 11px/1.6 var(--font-mono); letter-spacing: .1em; color: var(--accent); flex: 0 0 28px; }
.scene__t { font: 400 15px/1.65 var(--font-sans); color: var(--ink-2); }
.scene__t b { color: var(--ink); }

.related { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--col-gap); }

.cta-panel {
  background: var(--sand-100); border-radius: var(--r-lg); border: 1px solid var(--card-line);
  padding: clamp(var(--sp-5), 4vw, var(--sp-9));
  display: grid; grid-template-columns: 1.15fr 1fr; gap: var(--sp-8); align-items: center;
}
.cta-panel__title { font: 600 clamp(26px, 2.4vw, 40px)/1.12 var(--font-display); color: var(--ink); letter-spacing: -.01em; }
.cta-panel__text { font: 400 16px/1.7 var(--font-sans); color: var(--ink-2); margin-top: var(--sp-4); }
.cta-panel__actions { display: grid; gap: 14px; justify-items: start; }

/* ---------- 20. Group page ---------- */
.group-intro { display: grid; grid-template-columns: 1.3fr 1fr; gap: var(--sp-8); align-items: end; }
.buyer-block { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--col-gap); }
.buyer-block article { border-top: 1px solid var(--line); padding-top: var(--sp-4); }
.buyer-block h3 { font: 600 20px/1.3 var(--font-display); margin-bottom: 8px; }
.buyer-block p { font: 400 14.5px/1.65 var(--font-sans); color: var(--ink-2); }
.cross-links { display: flex; flex-wrap: wrap; gap: var(--sp-3); }
.chip {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 14px;
  border: 1px solid var(--line); border-radius: var(--r-xs); background: var(--sand-50);
  font: 500 11px/1.2 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-2);
}
.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip span { color: var(--accent); }

/* ---------- 21. About page ---------- */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-9); align-items: start; }
.body-copy p + p { margin-top: var(--sp-4); }
.body-copy p { font: 400 16.5px/1.75 var(--font-sans); color: var(--ink-2); max-width: 64ch; }
.shoot-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-3); }
.shoot-list .ph { aspect-ratio: 3 / 2; border-radius: var(--r-sm); }
.contact-block { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-8); align-items: start; }
.contact-list { display: grid; gap: var(--sp-5); }
.contact-item { display: grid; gap: 4px; }
.contact-item__k { font: 500 11px/1.2 var(--font-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); }
.contact-item__v { font: 400 16px/1.6 var(--font-sans); color: var(--ink); }
.contact-item__v a { border-bottom: 1px solid var(--sand-300); }
.contact-item__v a:hover { border-bottom-color: var(--ink); }
.map-box { aspect-ratio: 4 / 3; border-radius: var(--r-md); border: 1px solid var(--card-line); display: flex; align-items: center; justify-content: center; text-align: center; padding: var(--sp-6); }
.map-box > * { position: relative; z-index: 2; }

/* ---------- 22. RFQ page ---------- */
.rfq { display: grid; grid-template-columns: 1.35fr 1fr; gap: var(--sp-9); align-items: start; }
.rfq__aside { position: sticky; top: 108px; display: grid; gap: var(--sp-6); }
.aside-card { background: var(--sand-100); border: 1px solid var(--card-line); border-radius: var(--r-md); padding: var(--sp-6); }
.aside-card h2 { font: 600 22px/1.3 var(--font-display); margin-bottom: var(--sp-3); }
.aside-card p { font: 400 14.5px/1.7 var(--font-sans); color: var(--ink-2); }
.aside-list { display: grid; gap: 10px; margin-top: var(--sp-4); }
.aside-list li { display: flex; gap: 10px; font: 400 14px/1.6 var(--font-sans); color: var(--ink-2); }
.aside-list li::before { content: "—"; color: var(--accent); }
.rfq-header .site-header__bar { height: 72px; }
.rfq-back { font: 500 12px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.rfq-back:hover { color: var(--ink); }

/* ---------- 22b. Spacing helpers used by generated blocks ---------- */
.block-title { font: 600 clamp(24px, 2vw, 32px)/1.2 var(--font-display); letter-spacing: -.01em; color: var(--ink); margin: 0 0 var(--sp-5); }
.cross-links--gap { margin-top: var(--sp-4); }
.cert-block { margin-top: var(--sp-7); }
.shoot-list--gap { margin-top: var(--sp-7); }
.two-col--gap { margin-top: var(--sp-8); }
.contact-list--gap { margin-top: var(--sp-4); }
.map-box__note { margin-top: var(--sp-3); font: 400 14px/1.6 var(--font-sans); color: var(--ink-3); max-width: 30ch; }
.rfq__title { font: 600 clamp(30px, 3vw, 48px)/1.1 var(--font-display); letter-spacing: -.015em; color: var(--ink); margin-top: var(--sp-4); }
.form--rfq { margin-top: var(--sp-6); }
.form__notice--prefill { margin-top: var(--sp-4); color: var(--ink); }
.body-copy > .mono-label { margin-bottom: var(--sp-4); }

/* ---------- 23. Responsive (§3.4 breakpoints) ---------- */
@media (max-width: 1439px) {
  .cat-grid--11 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-7) var(--col-gap); }
  .cat-grid--11 > .cat-card { grid-column: auto; }
  .proof { grid-template-columns: 1fr; gap: var(--sp-8); }
  .quote-band__grid { grid-template-columns: 1fr; gap: var(--sp-7); }
  .rfq { grid-template-columns: 1fr; }
  .rfq__aside { position: static; }
}

@media (max-width: 1199px) {
  .cat-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lines { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-7) var(--col-gap); }
  .step::after { display: none; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .page-head__grid, .group-intro { grid-template-columns: 1fr; gap: var(--sp-6); }
  .page-head__facts { border-left: 0; padding-left: 0; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); padding-top: var(--sp-5); }
  .gallery { grid-template-columns: 1fr; }
  .gallery__side { grid-template-rows: none; grid-template-columns: repeat(3, 1fr); }
  .split, .two-col, .contact-block, .cta-panel { grid-template-columns: 1fr; gap: var(--sp-7); }
}

/* nav collapses below 1024 */
@media (max-width: 1023px) {
  /* backdrop-filter would make the header the containing block of the fixed
     drawer, collapsing its height - disable it and use a solid bar instead */
  .site-header { background: var(--sand-50); backdrop-filter: none; -webkit-backdrop-filter: none; }
  .nav-toggle { display: inline-flex; }
  .site-header__bar { height: 72px; }
  .nav {
    position: fixed; inset: 72px 0 0; z-index: 55;
    display: none; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--sand-50); padding: var(--sp-5) var(--gutter) var(--sp-9);
    overflow-y: auto; margin-left: 0;
  }
  .site-header.is-open .nav { display: flex; }
  .nav__link, .nav__trigger {
    justify-content: space-between; width: 100%; padding: 18px 0;
    font-size: 17px; border-bottom: 1px solid var(--line); border-bottom-color: var(--line);
  }
  .nav__link:hover, .nav__trigger:hover { border-bottom-color: var(--line); }
  .nav__cta { margin: var(--sp-6) 0 0; width: 100%; }
  .nav__cta .btn { width: 100%; }
  .mega { position: static; box-shadow: none; border-bottom: 0; padding: 0 0 var(--sp-5); background: transparent; }
  .mega__grid { grid-template-columns: 1fr; gap: var(--sp-5); }
  .mega__foot { display: none; }
  .cat-grid, .cat-grid--11 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cat-grid--11 > .cat-card { grid-column: auto; }
  .lines { grid-template-columns: 1fr; }
  .cases { grid-template-columns: 1fr; }
  .resources { grid-template-columns: 1fr; }
  .buyer-block { grid-template-columns: 1fr; }
  .related { grid-template-columns: 1fr 1fr; }
  .hero { aspect-ratio: auto; min-height: 620px; }
  .hero__media { inset: 0; }
  .hero__media--placeholder::after {
    content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(250,247,242,.9) 0%, rgba(250,247,242,.55) 55%, rgba(250,247,242,.95) 100%);
    mask-image: none; -webkit-mask-image: none; background-image: linear-gradient(180deg, rgba(250,247,242,.9) 0%, rgba(250,247,242,.55) 55%, rgba(250,247,242,.95) 100%);
  }
  .hero__media .media-tag { display: none; }
  .hero__inner { padding-block: var(--sp-9); }
  .hero h1 { font-size: 44px; }
  .quote-band__grid, .proof__stats { grid-template-columns: 1fr; }
  .proof__media .ph:first-child { grid-column: span 2; }
  .stat { padding-top: var(--sp-3); }
  .trust-strip__note { margin-left: 0; }
}

@media (max-width: 767px) {
  .cat-grid, .cat-grid--11 { grid-template-columns: 1fr; }
  .related { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: var(--sp-7); }
  .hero { width: 100%; aspect-ratio: 4 / 5; min-height: 520px; }
  .hero h1 { font-size: 36px; margin-top: 24px; }
  .hero__eyebrow { font-size: 12px; letter-spacing: .14em; }
  .hero__lead { font-size: 18px; }
  .hero__cta { margin-top: var(--sp-6); }
  .hero__cta .btn--lg { width: 100%; padding-inline: 24px; }
  .hero .hero__cta .btn--secondary { display: none; }
  .gallery__side { grid-template-columns: 1fr 1fr 1fr; }
  .shoot-list { grid-template-columns: 1fr; }
  .option { grid-template-columns: 1fr; gap: 4px; }
  .page-head__facts { grid-template-columns: 1fr; }
  .spec-table th { width: 40%; }
  .cta-panel { padding: var(--sp-5); }
  .cta-panel__actions { width: 100%; }
  .cta-panel__actions .btn { width: 100%; }
  .cat-card__title { font-size: 22px; }
  .resource { flex-direction: column; align-items: flex-start; }
  .resource__cover { width: 64px; }
  .section-head { flex-direction: column; align-items: flex-start; }
  .footer__bottom { flex-direction: column; }
}

@media (max-width: 380px) {
  .hero h1 { font-size: 32px; }
  .hero__eyebrow { font-size: 11px; letter-spacing: .1em; }
  .brand { font-size: 19px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* ---- legal pages (privacy / terms) ---- */
.legal-note {
  border-left: 3px solid var(--accent);
  background: var(--sand-100);
  padding: var(--sp-4) var(--sp-5);
  margin-bottom: var(--sp-7);
}
.legal-note p { font: 400 15px/1.65 var(--font-sans); color: var(--ink-2); }
.legal-note p + p { margin-top: 10px; }
.legal-note b { color: var(--ink); }
.tbc-mark {
  font: 500 12px/1.5 var(--font-mono);
  letter-spacing: .04em;
  color: var(--accent);
  border-bottom: 1px dashed var(--accent);
  padding: 0 2px;
  white-space: normal;
}