/* ==========================================================================
   MightyCargo — electricforklift.huibai.ltd
   Industrial design system: navy + safety orange, hazard-stripe accents.
   Mobile-first; desktop enhancements at 640 / 1024 px.
   ========================================================================== */

:root {
  --navy-950: #07182b;
  --navy-900: #0b1f3a;
  --navy-800: #112b4b;
  --navy-700: #17395f;
  --navy-100: #d8e3ee;
  --ink: #1c2836;
  --slate: #5a6b7c;
  --line: #dde5ec;
  --surface: #f2f5f8;
  --surface-2: #e9eff5;
  --white: #ffffff;
  --orange: #f5821f;
  --orange-deep: #d96b0a;
  --orange-soft: #fff0e2;
  --stripe: repeating-linear-gradient(45deg, rgba(245, 132, 31, 0.95) 0 10px, rgba(11, 31, 58, 0.95) 10px 20px);
  --font-display: "Archivo", "Segoe UI", system-ui, sans-serif;
  --font-body: "Barlow", "Helvetica Neue", Arial, sans-serif;
  --radius: 4px;
  --shadow: 0 10px 30px rgba(11, 31, 58, 0.10);
  --wrap: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
body.nav-open { overflow: hidden; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  color: var(--navy-900);
  margin: 0 0 0.6em;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(1.9rem, 4.6vw, 3.2rem); font-weight: 800; }
h2 { font-size: clamp(1.45rem, 3vw, 2.1rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 700; }
h4 { font-size: 1.02rem; font-weight: 700; }
p { margin: 0 0 1em; }
a { color: var(--orange-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { margin: 0; padding: 0; }
li { list-style: none; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; border-radius: 2px; }
::selection { background: var(--orange); color: #fff; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.section { padding: 64px 0; }
.section-alt { background: var(--surface); }
.section-dark { background: var(--navy-900); }
.section-dark h2 { color: #fff; }
.section-dark .section-tick { background: var(--stripe); }
.section-dark p { color: #d8e3ee; }
.section-scenarios { background: var(--surface-2); }
.section-faq { background: var(--surface); }
.section-more { text-align: center; margin: 36px 0 0; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.12s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-accent { background: var(--orange); color: #fff; border-color: var(--orange); }
.btn-accent:hover { background: var(--orange-deep); border-color: var(--orange-deep); }
.btn-outline { background: transparent; color: var(--navy-900); border-color: var(--navy-900); }
.btn-outline:hover { background: var(--navy-900); color: #fff; }
.btn-lg { padding: 15px 32px; font-size: 1.02rem; }
.btn-sm { padding: 9px 18px; font-size: 0.88rem; }
.btn-block { width: 100%; }
.hero .btn-outline, .section-dark .btn-outline, .cta .btn-outline, .page-hero .btn-outline {
  color: #fff; border-color: rgba(255, 255, 255, 0.75);
}
.hero .btn-outline:hover, .section-dark .btn-outline:hover, .cta .btn-outline:hover, .page-hero .btn-outline:hover {
  background: #fff; color: var(--navy-900);
}

/* ---------- Topbar & header ---------- */
.site-header { position: sticky; top: 0; z-index: 60; background: var(--white); box-shadow: 0 2px 14px rgba(7, 24, 43, 0.08); }
.topbar { background: var(--navy-950); color: #c9d6e4; font-size: 0.8rem; }
.topbar-inner { display: flex; justify-content: space-between; align-items: center; min-height: 34px; gap: 16px; }
.topbar-hide { display: none; }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 76px; gap: 20px; }
.brand { flex: 0 0 auto; }
.brand img { width: 172px; height: auto; }

.nav-toggle {
  display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; padding: 10px; background: transparent; border: 0; cursor: pointer;
}
.nav-toggle span { display: block; height: 3px; width: 100%; background: var(--navy-900); border-radius: 2px; transition: transform 0.2s ease, opacity 0.2s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.site-nav {
  position: absolute; top: 100%; left: 0; right: 0;
  background: var(--white); border-top: 1px solid var(--line);
  max-height: 0; overflow: hidden; opacity: 0; transition: max-height 0.28s ease, opacity 0.22s ease;
}
.site-nav.open { max-height: 640px; opacity: 1; overflow: auto; }
.nav-list { display: flex; flex-direction: column; padding: 8px 20px 20px; }
.nav-list > li > a {
  display: block; padding: 12px 6px; color: var(--navy-900);
  font-family: var(--font-display); font-weight: 600; font-size: 1.02rem;
}
.nav-list > li.is-active > a { color: var(--orange-deep); }
.dropdown { display: none; padding: 0 0 6px 18px; }
.nav-list > li.open .dropdown { display: block; }
.dropdown a { display: block; padding: 8px 6px; color: var(--slate); font-size: 0.95rem; }
.dropdown a:hover { color: var(--orange-deep); }
.nav-cta { margin-top: 14px; }

/* ---------- Home hero ---------- */
.hero { position: relative; color: #fff; background: var(--navy-900); overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0.35;
}
.hero-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(100deg, rgba(7, 24, 43, 0.92) 0%, rgba(7, 24, 43, 0.55) 55%, rgba(7, 24, 43, 0.25) 100%); }
.hero-inner { position: relative; padding: 72px 20px 56px; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-weight: 600; font-size: 0.95rem;
  color: #ffd9b8; margin-bottom: 18px; letter-spacing: 0.01em;
}
.hero-eyebrow::before { content: ""; width: 34px; height: 8px; background: var(--stripe); }
.hero h1 { color: #fff; }
.hero-sub { max-width: 640px; color: #d8e3ee; font-size: 1.06rem; margin: 18px 0 26px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-stats { margin-top: 46px; }

.stat-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 0; }
.stat { border-top: 2px solid rgba(255, 255, 255, 0.22); padding-top: 14px; }
.stat-value { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.6rem, 4vw, 2.3rem); color: #fff; margin: 0 0 4px; }
.stat dd { margin: 0; color: #b9c8d9; font-size: 0.92rem; }

/* ---------- Page hero (inner pages) ---------- */
.page-hero { position: relative; background: var(--navy-900); color: #fff; padding: 52px 0 46px; }
.page-hero .wrap { position: relative; z-index: 1; }
.page-hero h1 { color: #fff; }
.lead { color: #c9d6e4; max-width: 760px; font-size: 1.06rem; margin-top: 14px; }
.crumbs { display: flex; flex-wrap: wrap; gap: 6px; font-size: 0.85rem; margin-bottom: 22px; color: #93a8bd; }
.crumbs a { color: #c9d6e4; }
.crumbs a:hover { color: #fff; text-decoration: none; }
.crumb-sep { color: #5f7892; }
.crumb-current { color: #ffb57d; }
.page-hero-stripe { position: absolute; left: 0; right: 0; bottom: 0; height: 8px; background: var(--stripe); }

/* ---------- Section heads ---------- */
.section-head { margin-bottom: 40px; max-width: 780px; }
.section-head .section-tick { display: block; width: 44px; height: 8px; background: var(--stripe); margin-bottom: 18px; }
.section-head h2 { margin-bottom: 0.3em; }
.section-head p { color: var(--slate); font-size: 1.05rem; margin: 0; }

/* ---------- Home: series cards ---------- */
.series-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.series-card {
  background: var(--white); border: 1px solid var(--line); border-top: 4px solid var(--orange);
  padding: 28px; border-radius: var(--radius); box-shadow: var(--shadow);
  display: flex; flex-direction: column;
}
.series-card ul { margin: 14px 0 22px; display: grid; gap: 10px; }
.series-card li { color: var(--slate); font-size: 0.95rem; padding-left: 18px; position: relative; }
.series-card li::before { content: ""; position: absolute; left: 0; top: 8px; width: 8px; height: 8px; background: var(--orange); }
.series-icon { width: 52px; height: 52px; border-radius: var(--radius); background: var(--orange-soft); color: var(--orange-deep); display: grid; place-items: center; margin-bottom: 18px; }
.series-icon .icon { width: 28px; height: 28px; }
.series-card .btn { margin-top: auto; }

/* ---------- Feature grid ---------- */
.feature-grid { display: grid; grid-template-columns: 1fr; gap: 22px; }
.feature-item {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; display: flex; flex-direction: column; gap: 8px;
}
.feature-item .icon { width: 30px; height: 30px; color: var(--orange-deep); }
.feature-item h3 { margin: 6px 0 4px; }
.feature-item p { color: var(--slate); margin: 0; font-size: 0.96rem; }

/* ---------- Scenario grid ---------- */
.scenario-grid { display: grid; grid-template-columns: 1fr; gap: 18px; }
.scenario-item { display: flex; gap: 16px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.scenario-item .icon { flex: 0 0 auto; width: 30px; height: 30px; color: var(--orange-deep); margin-top: 2px; }
.scenario-item h3 { margin-bottom: 4px; }
.scenario-item p { color: var(--slate); margin: 0; font-size: 0.95rem; }

/* ---------- Product / case cards ---------- */
.product-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.product-card, .case-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.product-card:hover, .case-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.card-media { display: block; background: var(--navy-100); overflow: hidden; }
.card-media img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; transition: transform 0.35s ease; }
.product-card:hover .card-media img { transform: scale(1.04); }
.card-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }
.card-tag {
  display: inline-block; font-family: var(--font-display); font-weight: 600; font-size: 0.72rem;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--orange-deep);
  background: var(--orange-soft); padding: 3px 10px; border-radius: 20px; margin-bottom: 12px; align-self: flex-start;
}
.card-body h3 { margin-bottom: 8px; }
.card-body h3 a { color: var(--navy-900); }
.card-body h3 a:hover { color: var(--orange-deep); text-decoration: none; }
.card-desc { color: var(--slate); font-size: 0.94rem; margin-bottom: 14px; }
.card-link { margin-top: auto; font-family: var(--font-display); font-weight: 600; font-size: 0.92rem; color: var(--orange-deep); }
.card-link:hover { text-decoration: none; color: var(--navy-900); }

.case-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.case-card .card-media img { aspect-ratio: 4 / 3; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 12px; }
.faq-item { border: 1px solid var(--line); border-radius: var(--radius); background: var(--white); }
.faq-item summary {
  cursor: pointer; padding: 16px 20px; font-family: var(--font-display); font-weight: 600;
  color: var(--navy-900); font-size: 1rem; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 1.3rem; color: var(--orange-deep); }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { padding: 0 20px 16px; margin: 0; color: var(--slate); font-size: 0.96rem; }

/* ---------- About ---------- */
.about-intro { display: grid; grid-template-columns: 1fr; gap: 32px; align-items: start; }
.about-media img { width: 100%; border-radius: var(--radius); border: 1px solid var(--line); }
.about-text p { color: #37485a; }
.about-text .btn { margin-top: 10px; }
.mv-grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
.mv-card { background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.14); border-radius: var(--radius); padding: 30px; }
.mv-card .icon { width: 34px; height: 34px; color: var(--orange); margin-bottom: 16px; }
.mv-card h3 { color: #fff; }
.mv-card p { color: #c9d6e4; margin: 0; }
.cap-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
.cap-item { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; position: relative; }
.cap-num { font-family: var(--font-display); font-weight: 800; font-size: 1.05rem; color: var(--orange-deep); display: block; margin-bottom: 10px; }
.cap-item h3 { margin-bottom: 6px; }
.cap-item p { color: var(--slate); margin: 0; font-size: 0.95rem; }
.tech-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
.tech-item { border-left: 3px solid var(--orange); background: var(--surface); padding: 22px 24px; }
.tech-item .icon { width: 30px; height: 30px; color: var(--orange-deep); margin-bottom: 12px; }
.tech-item h3 { margin-bottom: 6px; }
.tech-item p { color: var(--slate); margin: 0; font-size: 0.95rem; }
.event-grid { display: grid; grid-template-columns: 1fr; gap: 20px; }
.event-item { margin: 0; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.event-item img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.event-item figcaption { padding: 12px 16px; color: var(--navy-900); font-family: var(--font-display); font-weight: 600; font-size: 0.92rem; }

/* ---------- Products page ---------- */
.series-intro { margin-bottom: 34px; }
.series-intro p { color: #37485a; }
.series-par { color: #37485a; max-width: 920px; }
.series-industries { background: var(--surface-2); border-radius: var(--radius); padding: 16px 20px; font-size: 0.95rem; color: var(--slate); }
.series-industries strong { color: var(--navy-900); }

/* ---------- Product detail ---------- */
.pd-top { display: grid; grid-template-columns: 1fr; gap: 34px; align-items: start; }
.pd-media img { width: 100%; max-width: 640px; border-radius: var(--radius); border: 1px solid var(--line); aspect-ratio: 1 / 1; object-fit: cover; }
.pd-name { margin-bottom: 0.4em; }
.pd-info p { color: #37485a; }
.pd-info .btn { margin-top: 6px; margin-right: 10px; }
.spec-grid { display: grid; grid-template-columns: 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 0; }
.spec-item { background: var(--white); padding: 14px 18px; margin: 0; display: grid; grid-template-columns: 1fr; gap: 2px; }
.spec-item dt { font-family: var(--font-display); font-weight: 600; font-size: 0.85rem; color: var(--slate); }
.spec-item dd { margin: 0; font-weight: 500; color: var(--navy-900); }
.spec-item:last-child:nth-child(odd) { grid-column: 1 / -1; }
.feature-list { display: grid; gap: 0; counter-reset: feat; max-width: 920px; }
.feature-list li { counter-increment: feat; padding: 18px 0 18px 52px; border-bottom: 1px solid var(--line); position: relative; }
.feature-list li::before { content: counter(feat, decimal-leading-zero); position: absolute; left: 0; top: 18px; font-family: var(--font-display); font-weight: 800; color: var(--orange-deep); }
.feature-list h4 { margin-bottom: 4px; }
.feature-list p { color: var(--slate); margin: 0; font-size: 0.96rem; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chips li { background: var(--white); border: 1px solid var(--line); border-radius: 30px; padding: 8px 18px; font-size: 0.92rem; color: var(--navy-900); }

/* ---------- Case detail ---------- */
.case-top { display: grid; grid-template-columns: 1fr; gap: 34px; align-items: start; }
.case-media img { width: 100%; max-width: 720px; border-radius: var(--radius); border: 1px solid var(--line); }
.case-facts p { color: #37485a; }
.case-equip { background: var(--surface-2); padding: 14px 18px; border-radius: var(--radius); font-size: 0.95rem; }
.pain-list { display: grid; gap: 14px; max-width: 900px; }
.pain-list li { background: var(--white); border-left: 4px solid var(--orange); padding: 16px 20px; color: #37485a; border-radius: 0 var(--radius) var(--radius) 0; box-shadow: var(--shadow); }
.sol-list { display: grid; gap: 18px; max-width: 960px; }
.sol-item { background: var(--surface); border-radius: var(--radius); padding: 22px 24px; }
.sol-item h4 { color: var(--navy-900); margin-bottom: 6px; }
.sol-item p { color: #37485a; margin: 0; }
.metrics { display: grid; grid-template-columns: 1fr; gap: 18px; }
.metric { background: rgba(255, 255, 255, 0.07); border: 1px solid rgba(255, 255, 255, 0.16); border-radius: var(--radius); padding: 22px; }
.metric-value { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.6rem, 4vw, 2.2rem); color: var(--orange); margin-bottom: 2px; }
.metric-label { font-family: var(--font-display); font-weight: 700; color: #fff; margin-bottom: 8px; }
.metric-desc { color: #b9c8d9; font-size: 0.92rem; margin: 0; }
.quote { margin: 30px 0 0; padding: 22px 26px; border-left: 4px solid var(--orange); background: rgba(255, 255, 255, 0.06); font-size: 1.05rem; color: #e6eef6; font-style: italic; }
.quote footer { margin-top: 10px; font-style: normal; font-size: 0.88rem; color: #b9c8d9; }
.case-extra { margin-top: 18px; color: #ffd9b8 !important; }
.extension { background: var(--surface-2); border-radius: var(--radius); padding: 22px 26px; max-width: 960px; }
.extension p { color: #37485a; margin: 0; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr; gap: 44px; align-items: start; }
.contact-info h2 { margin-bottom: 0.4em; }
.contact-info > p { color: var(--slate); max-width: 480px; }
.contact-points { display: grid; grid-template-columns: 1fr; gap: 18px; margin: 26px 0; }
.contact-points li { display: flex; gap: 14px; align-items: flex-start; }
.contact-points .icon { flex: 0 0 auto; width: 26px; height: 26px; color: var(--orange-deep); margin-top: 3px; }
.contact-points h3 { margin-bottom: 2px; }
.contact-points p { color: var(--slate); margin: 0; font-size: 0.95rem; }
.contact-note { background: var(--surface-2); border-radius: var(--radius); padding: 20px 24px; }
.contact-note h3 { margin-bottom: 4px; }
.contact-note p { color: var(--slate); margin: 0; font-size: 0.95rem; }
.contact-form-wrap { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 30px 26px; }
.contact-form { display: grid; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 18px; }
.field { display: grid; gap: 6px; }
.field label { font-family: var(--font-display); font-weight: 600; font-size: 0.88rem; color: var(--navy-900); }
.req { color: var(--orange-deep); }
.field input, .field select, .field textarea {
  width: 100%; font-family: var(--font-body); font-size: 1rem; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 14px; transition: border-color 0.15s ease, background 0.15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--orange); background: var(--white);
}
.field textarea { resize: vertical; min-height: 130px; }
.honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; opacity: 0; }
.form-error { background: #fdecea; color: #b3261e; border: 1px solid #f5c6c0; border-radius: var(--radius); padding: 12px 16px; margin: 0; font-size: 0.94rem; }
.form-status { font-family: var(--font-display); font-weight: 600; text-align: center; margin: 0; }
.form-status.ok { color: #1a7f37; }
.form-status.err { color: #b3261e; }
#form-submit:disabled { opacity: 0.6; cursor: progress; }

/* ---------- CTA band ---------- */
.cta { background: var(--navy-900); color: #fff; }
.cta-stripe { height: 8px; background: var(--stripe); }
.cta-inner { padding: 64px 20px; text-align: center; }
.cta h2 { color: #fff; margin-bottom: 0.3em; }
.cta p { color: #c9d6e4; max-width: 640px; margin: 0 auto 28px; }
.cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy-950); color: #93a8bd; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 34px; padding: 56px 20px 40px; }
.footer-brand-name { font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 0.94rem; }
.footer-legal { color: #5f7892; font-size: 0.85rem; }
.footer-col h3 { color: #fff; font-size: 0.95rem; margin-bottom: 16px; letter-spacing: 0.02em; }
.footer-col ul { display: grid; gap: 10px; }
.footer-col a { color: #93a8bd; font-size: 0.93rem; }
.footer-col a:hover { color: #ffd9b8; text-decoration: none; }
.footer-col p { font-size: 0.93rem; }
.footer-link { color: #ffb57d !important; font-family: var(--font-display); font-weight: 600; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.08); padding: 18px 0; }
.footer-bottom .wrap { display: flex; flex-direction: column; gap: 6px; }
.footer-bottom p { margin: 0; font-size: 0.85rem; }
.footer-bottom a { color: #c9d6e4; }
.footer-dot { padding: 0 8px; color: #5f7892; }

/* ---------- Misc ---------- */
.to-top {
  position: fixed; right: 18px; bottom: 18px; z-index: 50;
  width: 44px; height: 44px; display: grid; place-items: center;
  background: var(--navy-900); color: #fff; border-radius: 50%;
  font-size: 1.1rem; box-shadow: var(--shadow); opacity: 0; pointer-events: none;
  transition: opacity 0.2s ease;
}
.to-top.show { opacity: 1; pointer-events: auto; }
.to-top:hover { background: var(--orange-deep); text-decoration: none; }
.icon { width: 24px; height: 24px; }

/* ==========================================================================
   Breakpoints
   ========================================================================== */
@media (min-width: 640px) {
  .form-row { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .event-grid { grid-template-columns: repeat(2, 1fr); }
  .spec-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-row { grid-template-columns: repeat(4, 1fr); }
  .hero-stats { margin-top: 56px; }
}

@media (min-width: 768px) {
  .topbar-hide { display: block; }
  .mv-grid { grid-template-columns: repeat(2, 1fr); }
  .series-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .cap-grid { grid-template-columns: repeat(3, 1fr); }
  .tech-grid { grid-template-columns: repeat(3, 1fr); }
  .metrics { grid-template-columns: repeat(3, 1fr); }
  .case-grid { grid-template-columns: repeat(3, 1fr); }
  .event-grid { grid-template-columns: repeat(4, 1fr); }
  .contact-points { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; max-height: none; opacity: 1; overflow: visible; border-top: 0; background: transparent;display: flex;  align-items: center;  justify-content: flex-end; }
  .nav-list { flex-direction: row; align-items: center; gap: 6px; padding: 0; }
  .nav-list > li { position: relative; }
  .nav-list > li > a { padding: 26px 14px; font-size: 0.98rem; }
  .nav-list > li.is-active > a { color: var(--orange-deep); }
  .nav-list > li > a:hover { color: var(--orange-deep); text-decoration: none; }
  .dropdown {
    display: block; position: absolute; top: 100%; left: 0; min-width: 240px;
    background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
    box-shadow: var(--shadow); padding: 8px; opacity: 0; visibility: hidden;
    transform: translateY(6px); transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  }
  .nav-list > li.has-children:hover .dropdown,
  .nav-list > li.has-children:focus-within .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
  .dropdown a { padding: 10px 14px; border-radius: 2px; }
  .dropdown a:hover { background: var(--surface); color: var(--orange-deep); text-decoration: none; }
  .nav-cta { margin-top: 0; margin-left: 10px; padding: 11px 22px; }
  .hero-inner { padding: 96px 20px 72px; }
  .hero-sub { font-size: 1.12rem; }
  .hero-stats { margin-top: 64px; }
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .scenario-grid { grid-template-columns: repeat(3, 1fr); }
  .product-grid { grid-template-columns: repeat(4, 1fr); }
  .about-intro { grid-template-columns: 1fr 1.2fr; gap: 56px; }
  .pd-top { grid-template-columns: 1fr 1.15fr; gap: 56px; }
  .case-top { grid-template-columns: 1fr 1.15fr; gap: 56px; }
  .contact-grid { grid-template-columns: 1fr 1.2fr; gap: 64px; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1.2fr; }
  .footer-bottom .wrap { flex-direction: row; justify-content: space-between; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .product-card:hover, .case-card:hover { transform: none; }
  .product-card:hover .card-media img { transform: none; }
}