/* ==========================================================================
   Boyuan Transformateurs spéciaux — feuille de style globale
   https://transformer.xiaozhibg.cn
   Design : précision industrielle — acier bleu nuit & cuivre
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  --navy-950: #08131f;
  --navy-900: #0c1b30;
  --navy-800: #122642;
  --navy-700: #1a3356;
  --navy-600: #24436e;
  --steel-50: #f6f8fb;
  --steel-100: #eef2f7;
  --steel-200: #dfe6ee;
  --steel-300: #c6d1de;
  --steel-400: #97a9bd;
  --steel-500: #6d8198;
  --ink: #17222e;
  --muted: #5c6b7c;
  --copper: #b8873c;
  --copper-strong: #9a6f2c;
  --copper-soft: #d9b36a;
  --copper-pale: #eed9ac;
  --paper: #ffffff;
  --line: rgba(12, 27, 48, 0.12);
  --line-dark: rgba(255, 255, 255, 0.16);
  --radius: 2px;
  --shadow: 0 14px 34px rgba(12, 27, 48, 0.10);
  --font-display: "Oswald", "Barlow Condensed", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Barlow", "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", sans-serif;
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--copper-strong); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.12;
  color: var(--navy-900);
  margin: 0 0 0.55em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.05rem, 6vw, 3.5rem); letter-spacing: 0.012em; }
h2 { font-size: clamp(1.55rem, 4vw, 2.35rem); letter-spacing: 0.01em; }
h3 { font-size: 1.22rem; letter-spacing: 0.015em; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1.1em; }
ul, ol { margin: 0 0 1.2em; padding-left: 1.25em; }
li { margin-bottom: 0.45em; }

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

::selection { background: var(--copper-soft); color: var(--navy-950); }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--navy-900); color: #fff; padding: 10px 16px; z-index: 200;
}
.skip-link:focus { left: 0; }

.container {
  width: min(1200px, 92%);
  margin-inline: auto;
}

.section { padding: 4.4rem 0; }
.section--tint { background: var(--steel-50); }
.section--dark {
  background: var(--navy-900);
  color: #cdd8e5;
}
.section--dark h2, .section--dark h3 { color: #fff; }

/* En-tête de section : étiquette + titre */
.section-head { max-width: 760px; margin-bottom: 2.4rem; }
.section-head--center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: flex; align-items: center; gap: 12px;
  color: var(--copper-strong);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.92rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 0.7rem;
}
.eyebrow::before { content: ""; width: 30px; height: 2px; background: var(--copper); }
.section-head--center .eyebrow { justify-content: center; }
.section-head--center .eyebrow::after { content: ""; width: 30px; height: 2px; background: var(--copper); }
.section-sub { color: var(--muted); font-size: 1.02rem; }

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 26px;
  font-family: var(--font-body);
  font-weight: 600; font-size: 1rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .22s ease, border-color .22s ease, color .22s ease, transform .18s ease, box-shadow .22s ease;
  text-decoration: none !important;
  line-height: 1.2;
}
.btn:active { transform: translateY(1px); }

.btn-accent {
  background: var(--copper);
  color: #1b1507;
}
.btn-accent:hover {
  background: var(--copper-strong);
  color: #fff;
  box-shadow: 0 10px 22px rgba(184, 135, 60, 0.35);
}

.btn-light {
  background: #fff;
  color: var(--navy-900);
}
.btn-light:hover { background: var(--steel-100); color: var(--navy-800); }

.btn-outline {
  background: transparent;
  border-color: var(--line-dark);
  color: #e8eef6;
}
.btn-outline:hover { border-color: var(--copper); color: var(--copper-pale); }

.btn-outline-dark {
  background: transparent;
  border-color: var(--navy-700);
  color: var(--navy-800);
}
.btn-outline-dark:hover { border-color: var(--copper); color: var(--copper-strong); }

.btn-lg { padding: 16px 34px; font-size: 1.06rem; }

/* ---------- En-tête ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0;
  z-index: 90;
  background: rgba(12, 27, 48, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.site-header.is-scrolled {
  background: rgba(8, 19, 31, 0.97);
  border-bottom-color: var(--line-dark);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.28);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  min-height: 74px;
}

.brand {
  display: flex; align-items: center; gap: 12px;
  color: #fff; text-decoration: none !important;
  min-width: 0;
}
.brand-logo {
  width: 46px; height: auto; flex: 0 0 auto;
  border: 1px solid var(--line-dark);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.08; min-width: 0; }
.brand-name {
  font-family: var(--font-display);
  font-size: 1.28rem; font-weight: 600;
  letter-spacing: 0.18em;
  color: #fff;
  white-space: nowrap;
}
.brand-sub {
  font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--copper-soft);
  white-space: nowrap;
}

.site-nav {
  display: none;
  position: absolute; top: 100%; left: 0; right: 0;
  flex-direction: column;
  background: var(--navy-950);
  border-bottom: 1px solid var(--line-dark);
  padding: 8px 4% 16px;
}
.site-nav.is-open { display: flex; }
.nav-link {
  color: #cdd8e5;
  padding: 12px 2px;
  font-size: 1.02rem;
  font-weight: 500;
  border-bottom: 1px solid var(--line-dark);
  text-decoration: none !important;
  transition: color .2s ease;
}
.nav-link:last-of-type { border-bottom: 0; }
.nav-link:hover { color: var(--copper-pale); }
.nav-link.is-active { color: var(--copper-soft); }

.btn-nav { display: none; padding: 11px 20px; font-size: 0.95rem; }

.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 46px; height: 46px;
  background: transparent; border: 0; cursor: pointer;
  padding: 10px;
}
.nav-toggle span {
  display: block; height: 2px; width: 100%;
  background: #fff;
  transition: transform .25s ease, opacity .2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--navy-950);
  color: #fff;
  overflow: hidden;
}
.hero-media {
  position: absolute; inset: 0;
  margin: 0;
}
.hero-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center 30%;
}
.hero-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(8, 19, 31, 0.55) 0%, rgba(8, 19, 31, 0.35) 40%, rgba(8, 19, 31, 0.9) 100%),
    linear-gradient(90deg, rgba(8, 19, 31, 0.65) 0%, rgba(8, 19, 31, 0.15) 100%);
}
.hero-inner {
  position: relative; z-index: 2;
  padding: 9rem 0 3.4rem;
  max-width: 780px;
}
.hero .eyebrow { color: var(--copper-soft); }
.hero h1 { color: #fff; margin-bottom: 0.5em; }
.hero-sub { font-size: 1.12rem; color: #c9d6e4; max-width: 640px; margin-bottom: 1.7rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* Hero compact (pages intérieures) */
.hero--inner {
  padding-top: 74px;
  background: var(--navy-900);
}
.hero--inner .hero-media img { object-position: center 22%; }
.hero-inner--compact { padding: 4.6rem 0 3rem; }
.hero-inner--compact h1 { font-size: clamp(1.9rem, 5vw, 2.9rem); }
.hero-breadcrumb {
  font-size: 0.86rem; letter-spacing: 0.06em; color: #9fb2c6;
  margin-bottom: 1rem; text-transform: uppercase;
}
.hero-breadcrumb a { color: var(--copper-soft); text-decoration: none; }
.hero-breadcrumb a:hover { text-decoration: underline; }

/* Ligne d'énergie (motif signature) */
.energy-line { position: absolute; z-index: 3; bottom: 0; left: 0; right: 0; height: 3px; overflow: hidden; }
.energy-line svg { width: 100%; height: 3px; display: block; }
.energy-line path {
  stroke: var(--copper); stroke-width: 1.4; fill: none;
  stroke-dasharray: 100; stroke-dashoffset: 100;
  animation: energy-draw 1.4s ease-out 0.4s forwards;
}
@keyframes energy-draw { to { stroke-dashoffset: 0; } }

/* ---------- Bandeau statistiques ---------- */
.stats { background: var(--navy-900); border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); }
.stats-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1px; background: var(--line-dark);
}
.stat {
  background: var(--navy-900);
  padding: 1.7rem 1.2rem;
  text-align: center;
}
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.5vw, 2.5rem);
  font-weight: 600;
  color: var(--copper-soft);
  line-height: 1.05;
}
.stat-label {
  display: block; margin-top: 6px;
  font-size: 0.84rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: #9fb2c6;
}

/* ---------- Grilles ---------- */
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 1.6rem; }
.grid-4 { display: grid; grid-template-columns: 1fr; gap: 1.4rem; }

/* ---------- Cartes produit ---------- */
.product-card {
  display: flex; flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--copper);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.product-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-top-color: var(--copper-strong);
}
.product-card .card-media { position: relative; overflow: hidden; background: var(--steel-100); }
.product-card .card-media img {
  aspect-ratio: 1 / 1;
  object-fit: cover;
  width: 100%;
  transition: transform .5s ease;
}
.product-card:hover .card-media img { transform: scale(1.04); }
.card-body { padding: 1.4rem 1.4rem 1.5rem; display: flex; flex-direction: column; flex: 1; }
.card-title { font-size: 1.18rem; margin-bottom: 0.4rem; color: var(--navy-900); }
.card-desc { font-size: 0.95rem; color: var(--muted); flex: 1; }
.card-chips { display: flex; flex-wrap: wrap; gap: 7px; margin: 0.9rem 0 1.1rem; }
.chip {
  font-size: 0.76rem; font-weight: 600; letter-spacing: 0.04em;
  color: var(--navy-800);
  background: var(--steel-100);
  border: 1px solid var(--steel-300);
  padding: 4px 10px;
  border-radius: 999px;
}
.chip--copper { color: var(--copper-strong); background: #faf3e4; border-color: var(--copper-pale); }
.card-link {
  font-weight: 600; font-size: 0.96rem;
  color: var(--copper-strong);
  display: inline-flex; align-items: center; gap: 7px;
  text-decoration: none !important;
}
.card-link svg { transition: transform .2s ease; }
.card-link:hover svg { transform: translateX(4px); }

/* ---------- Bloc texte + image (à propos) ---------- */
.split {
  display: grid; grid-template-columns: 1fr;
  gap: 2.2rem; align-items: center;
}
.split-media img { width: 100%; object-fit: cover; }
.split-media .frame {
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.feature-list { list-style: none; padding: 0; margin: 1.3rem 0 1.6rem; }
.feature-list li {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--steel-300);
}
.feature-list li:last-child { border-bottom: 0; }
.feature-list svg { flex: 0 0 auto; margin-top: 3px; color: var(--copper); }

/* ---------- Certificats ---------- */
.cert-card {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 1.3rem;
}
.cert-card img {
  width: 88px; height: 124px; object-fit: cover; flex: 0 0 auto;
  border: 1px solid var(--steel-300);
}
.cert-card h3 { font-size: 1.05rem; margin-bottom: 0.3rem; }
.cert-card p { font-size: 0.92rem; color: var(--muted); margin: 0; }

/* ---------- Galerie usine ---------- */
.gallery-card { position: relative; overflow: hidden; background: var(--navy-800); }
.gallery-card img {
  width: 100%; aspect-ratio: 3 / 2; object-fit: cover;
  transition: transform .5s ease, opacity .3s ease;
  opacity: 0.94;
}
.gallery-card:hover img { transform: scale(1.04); opacity: 1; }
.gallery-cap {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 2.2rem 1rem 0.9rem;
  background: linear-gradient(180deg, transparent, rgba(8, 19, 31, 0.85));
  color: #fff;
  font-size: 0.95rem; font-weight: 500;
}

/* ---------- FAQ ---------- */
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 1.15rem 6px;
  font-family: var(--font-display);
  font-weight: 600; font-size: 1.13rem; letter-spacing: 0.01em;
  color: var(--navy-900);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "";
  flex: 0 0 auto;
  width: 12px; height: 12px;
  border-right: 2px solid var(--copper);
  border-bottom: 2px solid var(--copper);
  transform: rotate(45deg) translateY(-3px);
  transition: transform .25s ease;
}
.faq-item[open] summary::after { transform: rotate(-135deg) translateY(-3px); }
.faq-item summary:hover { color: var(--copper-strong); }
.faq-body { padding: 0 6px 1.5rem; color: #3c4a5a; max-width: 820px; }
.faq-body p:last-child { margin-bottom: 0; }
.faq-body ol, .faq-body ul { padding-left: 1.3em; }

/* ---------- Fil d'Ariane ---------- */
.breadcrumb {
  font-size: 0.85rem; color: var(--muted);
  padding: 1rem 0 0;
}
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; margin: 0; }
.breadcrumb li + li::before { content: "›"; color: var(--steel-400); }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--copper-strong); }
.breadcrumb [aria-current="page"] { color: var(--ink); font-weight: 500; }

/* ---------- Fiche produit ---------- */
.product-hero {
  padding-top: 74px;
  background: var(--navy-900);
  color: #cdd8e5;
}
.product-hero .breadcrumb { color: #9fb2c6; }
.product-hero .breadcrumb a { color: #9fb2c6; }
.product-hero .breadcrumb a:hover { color: var(--copper-soft); }
.product-hero .breadcrumb [aria-current="page"] { color: #fff; }
.product-hero h1 { color: #fff; }
.product-hero .hero-sub { color: #c9d6e4; max-width: 720px; }

.product-layout {
  display: grid; grid-template-columns: 1fr;
  gap: 2.2rem;
  padding: 3rem 0;
}
.product-gallery { position: relative; }
.product-gallery img {
  width: 100%;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: var(--steel-100);
}

.spec-box {
  border: 1px solid var(--line);
  border-top: 3px solid var(--copper);
  padding: 1.6rem;
  background: var(--paper);
}
.spec-box h3 { margin-bottom: 1rem; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 0.96rem; }
.spec-table th, .spec-table td {
  text-align: left; vertical-align: top;
  padding: 10px 4px;
  border-bottom: 1px solid var(--steel-200);
}
.spec-table th { color: var(--muted); font-weight: 500; width: 40%; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }

.prose { max-width: 780px; }
.prose h2 { margin-top: 1.8rem; }
.prose h3 { margin-top: 1.4rem; }

/* Tableau gamme */
.data-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; table-layout: fixed; }
.data-table caption { text-align: left; font-weight: 600; color: var(--navy-900); padding-bottom: 0.7rem; font-family: var(--font-display); font-size: 1.05rem; }
.data-table th, .data-table td { text-align: left; padding: 11px 10px; border-bottom: 1px solid var(--steel-200); vertical-align: top; word-wrap: break-word; }
.data-table thead th { background: var(--navy-900); color: #fff; font-weight: 500; font-size: 0.9rem; letter-spacing: 0.04em; }
.data-table tbody tr:nth-child(even) { background: var(--steel-50); }

/* ---------- Formulaires ---------- */
.form-grid {
  display: grid; grid-template-columns: 1fr;
  gap: 18px;
}
.form-field { display: flex; flex-direction: column; gap: 7px; }
.form-field--full { grid-column: 1 / -1; }
.form-field label { font-size: 0.92rem; font-weight: 600; color: var(--navy-800); }
.form-field .req { color: var(--copper-strong); }
.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  font: inherit; font-size: 1rem;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--steel-300);
  border-radius: var(--radius);
  padding: 12px 14px;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.form-field textarea { min-height: 150px; resize: vertical; }
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--copper);
  box-shadow: 0 0 0 3px rgba(184, 135, 60, 0.16);
}
.form-field .hint { font-size: 0.84rem; color: var(--muted); }
.form-check { display: flex; gap: 10px; align-items: flex-start; font-size: 0.9rem; color: var(--muted); }
.form-check input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--copper-strong); }
.form-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.form-note { font-size: 0.85rem; color: var(--muted); }

.hp-field { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; overflow: hidden; }

.alert {
  border: 1px solid; border-radius: var(--radius);
  padding: 14px 18px; margin-bottom: 1.4rem;
  font-size: 0.98rem;
}
.alert--ok { border-color: #2e7d4f; background: #eef7f1; color: #1d5c39; }
.alert--err { border-color: #b3402f; background: #fdf0ee; color: #8c2d20; }
.alert a { color: inherit; text-decoration: underline; }

/* ---------- Bandeau CTA ---------- */
.cta-strip {
  background:
    linear-gradient(120deg, var(--navy-950) 0%, var(--navy-800) 60%, var(--navy-700) 100%);
  color: #e8eef6;
  padding: 3.4rem 0;
}
.cta-inner {
  display: flex; flex-direction: column; align-items: flex-start; gap: 1.1rem;
}
.cta-inner h2 { color: #fff; margin: 0; font-size: clamp(1.5rem, 4vw, 2.1rem); }
.cta-inner p { color: #b9c8d9; margin: 0; max-width: 640px; }

/* ---------- Pied de page ---------- */
.site-footer { background: var(--navy-950); color: #93a6ba; font-size: 0.95rem; }
.footer-grid {
  display: grid; grid-template-columns: 1fr;
  gap: 2.2rem;
  padding: 3.2rem 0 2.2rem;
}
.footer-col h3 {
  color: #fff; font-size: 0.98rem; letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 1rem;
}
.footer-brand p { color: #93a6ba; margin-top: 0.9rem; }
.footer-addr { margin-top: 1rem; display: flex; gap: 10px; color: #93a6ba; }
.footer-addr svg { flex: 0 0 auto; margin-top: 3px; color: var(--copper-soft); }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 0.55rem; }
.footer-links a { color: #93a6ba; text-decoration: none; }
.footer-links a:hover { color: var(--copper-pale); }
.footer-bottom {
  border-top: 1px solid var(--line-dark);
  padding: 1.2rem 0 1.5rem;
  font-size: 0.84rem;
  display: flex; flex-direction: column; gap: 6px;
}
.footer-bottom a { color: #93a6ba; }
.footer-brand .brand { margin-bottom: 0.6rem; }

/* ---------- 404 ---------- */
.notfound { text-align: center; padding: 7rem 0 5rem; }
.notfound .code { font-family: var(--font-display); font-size: clamp(4rem, 14vw, 7rem); color: var(--copper); line-height: 1; }
.notfound p { color: var(--muted); max-width: 480px; margin: 1rem auto 1.8rem; }

/* ---------- Divers ---------- */
.center { text-align: center; }
.mt-1 { margin-top: 1rem; } .mt-2 { margin-top: 2rem; } .mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; } .mb-2 { margin-bottom: 2rem; }

.cases-grid .gallery-cap { font-size: 0.88rem; }

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .form-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 860px) {
  .section { padding: 5.6rem 0; }
  .header-inner { min-height: 82px; }
  .site-nav {
    display: flex; position: static;
    flex-direction: row;
    background: transparent;
    border: 0; padding: 0;
    gap: 30px;
  }
  .nav-link {
    border: 0; padding: 6px 0;
    font-size: 0.98rem;
    position: relative;
  }
  .nav-link::after {
    content: ""; position: absolute; left: 0; bottom: 0;
    width: 0; height: 2px; background: var(--copper);
    transition: width .25s ease;
  }
  .nav-link:hover::after, .nav-link.is-active::after { width: 100%; }
  .btn-nav { display: inline-flex; }
  .nav-toggle { display: none; }
  .hero-inner { padding: 11rem 0 5rem; }
  .hero-inner--compact { padding: 6rem 0 3.6rem; }
  .cta-inner { flex-direction: row; align-items: center; justify-content: space-between; }
  .cta-inner .btn { flex: 0 0 auto; }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
  .split { grid-template-columns: 1fr 1.05fr; gap: 3.4rem; }
  .split--reverse .split-media { order: 2; }
  .product-layout { grid-template-columns: 1.15fr 0.85fr; gap: 3rem; }
  .footer-grid { grid-template-columns: 1.4fr 0.8fr 1fr 1fr; }
  .brand-logo { width: 58px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
/* （注：内容由AI生成） */