/* ==========================================================================
   Pneumatic Air Filter Cleaner — design system
   Industrial spec-sheet aesthetic: graphite, safety orange, hairline rules.
   ========================================================================== */

:root {
  --ink: #0b1220;
  --ink-2: #121b2b;
  --ink-3: #1b2638;
  --line-d: #243149;
  --on-ink: #ffffff;
  --on-ink-muted: #9fb0c6;

  --paper: #ffffff;
  --paper-2: #f5f7fa;
  --paper-3: #eef1f5;
  --line: #e1e6ec;
  --line-2: #cfd6df;

  --text: #0d1524;
  --muted: #5a6779;
  --muted-2: #7b8798;

  --accent: #e85d00;
  --accent-hot: #ff6a00;
  --accent-soft: #fff1e6;
  --ok: #0f9d58;

  --r: 4px;
  --r-lg: 8px;
  --shadow: 0 1px 2px rgba(13, 21, 36, .06), 0 12px 32px -18px rgba(13, 21, 36, .28);
  --shadow-lg: 0 2px 4px rgba(13, 21, 36, .05), 0 32px 64px -32px rgba(13, 21, 36, .35);
  --wrap: 1180px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
img { height: auto; }
figure { margin: 0; }

a { color: inherit; text-decoration: none; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; }
h1, h2, h3, h4 { margin: 0; line-height: 1.12; letter-spacing: -.018em; font-weight: 800; }

::selection { background: var(--accent); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--ink); color: #fff; padding: 12px 18px; font-size: 14px;
}
.skip:focus { left: 8px; top: 8px; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

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

/* ---------------------------------------------------------------- header */
.topbar {
  background: var(--ink); color: var(--on-ink-muted);
  font-size: 12.5px; letter-spacing: .02em;
  border-bottom: 1px solid var(--line-d);
}
.topbar .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 38px; flex-wrap: wrap;
}
.topbar a { color: #dbe4f0; }
.topbar a:hover { color: #fff; }
.topbar .dot { color: var(--line-d); margin: 0 10px; }
.topbar strong { color: var(--accent-hot); font-weight: 700; }

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s var(--ease);
}
.site-header.is-stuck { box-shadow: 0 8px 24px -18px rgba(13, 21, 36, .45); }

.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; min-height: 72px;
}
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark {
  width: 40px; height: 40px; flex: none;
  border-radius: 10px;
  background: var(--ink);
  display: grid; place-items: center;
}
.brand-mark svg { width: 24px; height: 24px; }
.brand-text { line-height: 1.15; }
.brand-text b {
  display: block; font-size: 13px; letter-spacing: .16em;
  text-transform: uppercase; font-weight: 800; color: var(--ink);
}
.brand-text span { display: block; font-size: 11px; letter-spacing: .1em; color: var(--muted-2); text-transform: uppercase; }

.nav-list { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav-list a {
  display: block; padding: 10px 12px; font-size: 14px; font-weight: 600;
  color: #33404f; border-radius: var(--r); transition: color .15s, background .15s;
}
.nav-list a:hover { color: var(--accent); background: var(--paper-2); }
.nav-list a[aria-current="page"] { color: var(--ink); }
.nav-list a[aria-current="page"]::after {
  content: ""; display: block; height: 2px; background: var(--accent);
  margin-top: 6px; border-radius: 2px;
}

.nav-cta { display: flex; align-items: center; gap: 10px; }

.lang-switch {
  display: inline-block; margin-right: 2px;
  font-size: 12px; font-weight: 700; letter-spacing: .06em;
  color: var(--muted); padding: 7px 9px; border-radius: var(--r);
  text-decoration: none; line-height: 1.1; transition: color .15s, background .15s;
}
.lang-switch:hover { color: var(--ink); background: var(--paper-2); }
.lang-switch.is-on { color: var(--ink); background: #e8edf4; }

/* CJK typography: smaller display sizes read better and break less awkwardly */
html[lang="zh-Hant"] .hero h1 {
  font-size: clamp(27px, 3.3vw, 44px);
  line-height: 1.28;
  letter-spacing: 0;
}
html[lang="zh-Hant"] .hero .lead { font-size: 16.5px; line-height: 1.75; }
html[lang="zh-Hant"] .section-head h2 { line-height: 1.3; letter-spacing: 0; }
html[lang="zh-Hant"] .page-head h1 { line-height: 1.3; letter-spacing: 0; }
html[lang="zh-Hant"] .card h3, html[lang="zh-Hant"] .step h3 { line-height: 1.4; }
html[lang="zh-Hant"] .spec-table th, html[lang="zh-Hant"] .spec-table td { line-height: 1.5; }

.nav-toggle {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line-2);
  background: #fff; border-radius: var(--r); cursor: pointer; padding: 0;
  align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  display: block; width: 18px; height: 2px; background: var(--ink);
  content: ""; position: relative; transition: transform .2s;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 22px; border-radius: var(--r);
  font-size: 13.5px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  background: var(--accent); color: #fff; border: 1px solid var(--accent);
  cursor: pointer; transition: background .16s, transform .16s, border-color .16s;
  white-space: nowrap;
}
.btn:hover { background: #cf5200; border-color: #cf5200; transform: translateY(-1px); }
.btn svg { width: 16px; height: 16px; }
.btn--ghost {
  background: transparent; color: var(--ink); border-color: var(--line-2);
}
.btn--ghost:hover { background: var(--paper-2); border-color: var(--ink); color: var(--ink); }
.btn--on-dark { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .28); }
.btn--on-dark:hover { background: rgba(255, 255, 255, .1); border-color: #fff; }
.btn--sm { padding: 10px 16px; font-size: 12.5px; }
.btn--block { width: 100%; }

/* ---------------------------------------------------------------- hero */
.hero {
  position: relative; background: var(--ink); color: #fff; overflow: hidden;
  border-bottom: 1px solid var(--line-d);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 90% at 70% 20%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 90% at 70% 20%, #000 30%, transparent 78%);
  pointer-events: none;
}
.hero > .wrap {
  position: relative;
  display: grid; grid-template-columns: 1.02fr .98fr;
  gap: 56px; align-items: center;
  padding-top: 62px; padding-bottom: 62px;
}
.hero .eyebrow { color: var(--accent-hot); }
.hero h1 {
  font-size: clamp(34px, 4.4vw, 56px);
  letter-spacing: -.03em; margin: 14px 0 20px;
}
.hero h1 em { font-style: normal; color: var(--accent-hot); }
.hero .lead {
  font-size: 17.5px; color: #c3cfdf; max-width: 46ch; margin-bottom: 30px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.hero-figure { position: relative; }
.hero-plate {
  background: #fff; border-radius: var(--r-lg);
  padding: 22px; box-shadow: var(--shadow-lg);
  position: relative;
  width: fit-content; max-width: 100%; margin-inline: auto;
}
.hero-plate::after {
  content: "Ø305 mm base plate · Ø20 × 600 mm rod";
  position: absolute; left: 0; right: 0; bottom: -28px;
  font-size: 11px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--on-ink-muted); text-align: center;
}
.hero-plate img { max-height: 560px; width: auto; max-width: 100%; margin: 0 auto; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-d); margin-top: 44px;
}
.hero-stats div { padding: 20px 12px 0; border-right: 1px solid var(--line-d); }
.hero-stats div:first-child { padding-left: 0; }
.hero-stats div:last-child { border-right: 0; }
.hero-stats b {
  display: block; font-size: 24px; font-weight: 800; letter-spacing: -.02em;
  font-variant-numeric: tabular-nums; color: #fff;
}
.hero-stats span {
  display: block; font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--on-ink-muted); margin-top: 4px;
}

/* ---------------------------------------------------------------- sections */
.section { padding: 84px 0; }
.section--tight { padding: 60px 0; }
.section--alt { background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section--ink { background: var(--ink); color: #fff; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 11.5px; font-weight: 700; letter-spacing: .16em;
  text-transform: uppercase; color: var(--accent);
  margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: currentColor; }

.section-head { max-width: 720px; margin-bottom: 44px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(26px, 3vw, 38px); margin-bottom: 14px; }
.section-head .lead { font-size: 17px; color: var(--muted); margin: 0; }
.section--ink .section-head .lead { color: var(--on-ink-muted); }

.grid { display: grid; gap: 20px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ---------------------------------------------------------------- cards */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 28px; transition: border-color .18s, box-shadow .18s, transform .18s var(--ease);
}
.card:hover { border-color: var(--line-2); box-shadow: var(--shadow); transform: translateY(-2px); }
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { font-size: 14.5px; color: var(--muted); margin: 0; }
.card .icon {
  width: 44px; height: 44px; border-radius: var(--r);
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; margin-bottom: 18px;
}
.card .icon svg { width: 22px; height: 22px; }
.card .num {
  font-size: 12px; font-weight: 800; letter-spacing: .16em;
  color: var(--muted-2); margin-bottom: 14px;
}

/* link cards for applications */
.app-card {
  position: relative; display: flex; flex-direction: column; gap: 10px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 26px; overflow: hidden;
  transition: border-color .18s, box-shadow .18s, transform .18s var(--ease);
}
.app-card:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-2px); }
.app-card .icon { width: 40px; height: 40px; color: var(--accent); }
.app-card h3 { font-size: 18px; }
.app-card p { font-size: 14px; color: var(--muted); margin: 0; flex: 1; }
.app-card .more {
  font-size: 12.5px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent); margin-top: 6px;
}

/* ---------------------------------------------------------------- stats / facts */
.facts {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line); border-radius: var(--r-lg);
  background: #fff; overflow: hidden;
}
.facts > div { padding: 24px 22px; border-right: 1px solid var(--line); }
.facts > div:last-child { border-right: 0; }
.facts b {
  display: block; font-size: 28px; font-weight: 800; letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}
.facts span {
  display: block; margin-top: 4px; font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted-2);
}

/* ---------------------------------------------------------------- spec table */
.spec-table { width: 100%; border-collapse: collapse; background: #fff; }
.spec-table caption {
  text-align: left; font-size: 12px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--muted-2); padding-bottom: 12px;
}
.spec-table tr { border-bottom: 1px solid var(--line); }
.spec-table tr:last-child { border-bottom: 0; }
.spec-table th, .spec-table td {
  text-align: left; padding: 15px 20px; font-size: 15px; vertical-align: top;
}
.spec-table th {
  width: 42%; font-weight: 600; color: var(--muted);
  background: var(--paper-2); border-right: 1px solid var(--line);
}
.spec-table td { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }
.spec-frame { border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }

/* ---------------------------------------------------------------- comparison table */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.cmp { width: 100%; min-width: 760px; border-collapse: collapse; background: #fff; text-align: left; }
.cmp thead th {
  padding: 14px 18px; font-size: 11.5px; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); background: var(--paper-2);
  border-bottom: 2px solid var(--line-2); vertical-align: bottom;
}
.cmp thead th.hi { color: var(--accent); }
.cmp tbody th {
  padding: 15px 18px; font-size: 14px; font-weight: 600; color: var(--muted);
  background: var(--paper-2); border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line); width: 26%;
}
.cmp td { padding: 15px 18px; font-size: 14.5px; color: #2c3a4d; border-bottom: 1px solid var(--line); }
.cmp td.hi { background: #fff8f3; color: var(--text); font-weight: 600; }
.cmp tbody tr:last-child th, .cmp tbody tr:last-child td { border-bottom: 0; }

/* wide technical figure */
.figure-wide {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 28px 32px; box-shadow: var(--shadow);
}
.figure-wide img { width: 100%; }
.figure-wide figcaption {
  margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--muted-2);
}

/* ---------------------------------------------------------------- steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: s; }
.step { position: relative; padding-top: 26px; border-top: 2px solid var(--line-2); }
.step::before {
  counter-increment: s; content: "0" counter(s);
  position: absolute; top: -13px; left: 0;
  background: var(--paper); padding-right: 10px;
  font-size: 12px; font-weight: 800; letter-spacing: .16em; color: var(--accent);
}
.section--ink .step { border-top-color: var(--line-d); }
.section--ink .step::before { background: var(--ink); }
.step h3 { font-size: 16px; margin-bottom: 6px; }
.step p { font-size: 14px; color: var(--muted); margin: 0; }
.section--ink .step p { color: var(--on-ink-muted); }

/* ---------------------------------------------------------------- comparison */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.compare > div { padding: 30px 28px; }
.compare .bad { background: var(--paper-2); border-right: 1px solid var(--line); }
.compare .good { background: #fff; }
.compare h3 { font-size: 16px; display: flex; align-items: center; gap: 9px; margin-bottom: 16px; }
.compare ul { list-style: none; display: grid; gap: 10px; }
.compare li { position: relative; padding-left: 26px; font-size: 14.5px; color: var(--muted); }
.compare .bad li::before {
  content: "✕"; position: absolute; left: 0; top: 0; color: #b42318; font-weight: 700; font-size: 13px;
}
.compare .good li { color: var(--text); }
.compare .good li::before {
  content: "✓"; position: absolute; left: 0; top: 0; color: var(--ok); font-weight: 700; font-size: 13px;
}

/* ---------------------------------------------------------------- CTA band */
.cta-band {
  background: var(--ink); color: #fff; position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(90% 120% at 15% 50%, #000 20%, transparent 80%);
  -webkit-mask-image: radial-gradient(90% 120% at 15% 50%, #000 20%, transparent 80%);
}
.cta-band .wrap {
  position: relative; display: grid; grid-template-columns: 1fr auto;
  gap: 32px; align-items: center; padding-top: 56px; padding-bottom: 56px;
}
.section.cta-band { padding: 0; }
.cta-band h2 { font-size: clamp(24px, 2.6vw, 34px); margin-bottom: 10px; }
.cta-band p { color: var(--on-ink-muted); margin: 0; max-width: 56ch; font-size: 15.5px; }

/* ---------------------------------------------------------------- forms */
.form-card {
  background: #fff; color: var(--text); border-radius: var(--r-lg);
  padding: 32px; box-shadow: var(--shadow-lg); border: 1px solid var(--line);
}
.form-card h3 { font-size: 20px; margin-bottom: 6px; }
.form-card .hint { font-size: 13.5px; color: var(--muted); margin-bottom: 22px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 16px; }
.field label {
  display: block; font-size: 11.5px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 7px;
}
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; font: inherit; font-size: 15px; color: var(--text);
  background: #fff; border: 1px solid var(--line-2); border-radius: var(--r);
  transition: border-color .15s, box-shadow .15s;
}
.field textarea { min-height: 104px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(232, 93, 0, .14);
}
.field .req { color: var(--accent); }
.form-note { font-size: 12.5px; color: var(--muted-2); margin-top: 12px; }

.form-actions { display: flex; gap: 10px; margin-top: 20px; }
.form-actions .btn { flex: 1 1 0; padding: 14px 10px; font-size: 13px; }
.send-fallback {
  margin-top: 14px; padding: 14px 16px; background: var(--paper-2);
  border: 1px solid var(--line); border-radius: var(--r); font-size: 13px;
}
.send-fallback p { margin: 0 0 10px; color: var(--muted); }
.send-fallback a { color: var(--accent); font-weight: 600; }
@media (max-width: 480px) {
  .form-actions { flex-direction: column; }
  .form-actions .btn { width: 100%; }
}
.hp { position: absolute; left: -9999px; }

/* ---------------------------------------------------------------- footer */
.site-footer { background: var(--ink); color: var(--on-ink-muted); font-size: 14px; }
.site-footer a { color: #cdd8e6; }
.site-footer a:hover { color: #fff; }
.footer-main {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px; padding: 60px 0 44px;
}
.footer-main h4 {
  font-size: 11.5px; letter-spacing: .16em; text-transform: uppercase;
  color: #7f90a6; margin-bottom: 16px; font-weight: 700;
}
.footer-main ul { list-style: none; display: grid; gap: 9px; font-size: 14px; }
.footer-brand .brand-text b { color: #fff; }
.footer-brand .brand-text span { color: #7f90a6; }
.footer-brand p { margin: 16px 0 0; max-width: 34ch; font-size: 13.5px; color: #8b9bb0; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact svg { width: 16px; height: 16px; flex: none; margin-top: 3px; color: var(--accent-hot); }
.footer-bottom {
  border-top: 1px solid var(--line-d);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 20px 0; font-size: 12.5px; color: #7f90a6;
}

/* ---------------------------------------------------------------- page header (inner pages) */
.page-head {
  background: var(--ink); color: #fff; position: relative; overflow: hidden;
  border-bottom: 1px solid var(--line-d);
}
.page-head::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(100% 120% at 20% 0%, #000 25%, transparent 80%);
  -webkit-mask-image: radial-gradient(100% 120% at 20% 0%, #000 25%, transparent 80%);
}
.page-head .wrap { position: relative; padding-top: 56px; padding-bottom: 56px; }
.page-head h1 { font-size: clamp(30px, 3.6vw, 46px); margin: 12px 0 14px; max-width: 22ch; }
.page-head .lead { color: #c3cfdf; max-width: 62ch; margin: 0; font-size: 17px; }

.crumbs { font-size: 12.5px; color: #7f90a6; letter-spacing: .04em; }
.crumbs a { color: #a9b8cb; }
.crumbs a:hover { color: #fff; }
.crumbs span { margin: 0 8px; opacity: .5; }

/* ---------------------------------------------------------------- prose */
.prose h2 { font-size: 28px; margin: 44px 0 14px; }
.prose h3 { font-size: 19px; margin: 30px 0 10px; }
.prose p, .prose li { font-size: 16px; color: #2c3a4d; }
.prose ul { list-style: none; display: grid; gap: 10px; margin: 0 0 20px; }
.prose ul li { position: relative; padding-left: 22px; }
.prose ul li::before {
  content: ""; position: absolute; left: 0; top: .62em;
  width: 7px; height: 7px; background: var(--accent); border-radius: 1px;
}
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }

/* ---------------------------------------------------------------- faq */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  padding: 22px 0; cursor: pointer; list-style: none;
  font-size: 17px; font-weight: 700; color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font-size: 24px; font-weight: 400; color: var(--accent);
  flex: none; width: 24px; line-height: 1; text-align: center;
  transition: transform .2s;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .answer { padding: 0 0 24px; max-width: 78ch; }
.faq .answer p { color: var(--muted); font-size: 15.5px; }
.faq .answer p:last-child { margin-bottom: 0; }

/* ---------------------------------------------------------------- misc */
.pill-row { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  font-size: 12px; font-weight: 600; letter-spacing: .04em;
  padding: 7px 12px; border-radius: 100px;
  background: var(--paper-2); border: 1px solid var(--line); color: #3d4a5c;
}
.split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: start; }
.split--center { align-items: center; }
.figure-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 18px; box-shadow: var(--shadow);
}
.figure-card figcaption {
  font-size: 12px; color: var(--muted-2); letter-spacing: .06em;
  text-transform: uppercase; margin-top: 12px; text-align: center;
}
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; align-items: start; }
.gallery figure { margin: 0; background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.gallery img { width: 100%; aspect-ratio: 3/2; object-fit: cover; }
.gallery figcaption { font-size: 12.5px; color: var(--muted); padding: 12px 14px; border-top: 1px solid var(--line); }

.note {
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  padding: 16px 20px; border-radius: 0 var(--r) var(--r) 0; font-size: 14.5px;
}
.note strong { color: var(--ink); }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 1024px) {
  .hero > .wrap { grid-template-columns: 1fr; gap: 40px; padding-top: 56px; padding-bottom: 56px; }
  .hero-figure { max-width: 380px; }
  .hero-plate::after { display: none; }
  .hero-stats { margin-top: 8px; }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); row-gap: 34px; }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .facts > div:nth-child(2) { border-right: 0; }
  .facts > div:nth-child(1), .facts > div:nth-child(2) { border-bottom: 1px solid var(--line); }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 36px; }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .cta-band .wrap { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-list {
    position: absolute; left: 0; right: 0; top: 100%;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 8px 16px 16px; box-shadow: 0 24px 32px -24px rgba(13, 21, 36, .4);
    display: none;
  }
  .nav-list.is-open { display: flex; }
  .nav-list a { padding: 14px 8px; font-size: 15px; border-bottom: 1px solid var(--paper-3); }
  .nav-list a[aria-current="page"]::after { display: none; }
  .nav-cta .btn { padding: 10px 14px; font-size: 12px; }
  .grid--3, .grid--2, .grid--4 { grid-template-columns: 1fr; }
  .compare { grid-template-columns: 1fr; }
  .compare .bad { border-right: 0; border-bottom: 1px solid var(--line); }
  .gallery { grid-template-columns: 1fr; }
  .gallery img { aspect-ratio: 16/9; }
  .section { padding: 60px 0; }
  .topbar .wrap { justify-content: center; text-align: center; }
  .topbar .tb-hide { display: none; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 18px; }
  .hero h1 { font-size: 32px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); row-gap: 18px; }
  .hero-stats div:nth-child(2) { border-right: 0; }
  .field-row { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; }
  .form-card { padding: 24px; }
  .steps { grid-template-columns: 1fr; }
  .facts > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .facts > div:last-child { border-bottom: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}