/* 不锈钢贸易公司网站模板 (风格参考 psglobal.hk)
   深蓝 #1d224b + 橙 #ff6900,浅色主题, squared industrial corners. */

:root {
  --navy: #1d224b;
  --navy-dark: #151a3d;
  --navy-deep: #101430;
  --orange: #ff6900;
  --orange-dk: #e05500;
  --ink: #23252f;
  --muted: #6e6e74;
  --light: #f8f8f8;
  --line: #e6e6eb;
  --white: #ffffff;
  --radius: 0;
  --font: "Jost", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  --mono: "JetBrains Mono", Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
::selection { background: var(--orange); color: #fff; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

.mono { font-family: var(--mono); }

/* ============ preloader ============ */
.preloader {
  position: fixed; inset: 0; z-index: 200;
  background: var(--navy);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.done { opacity: 0; visibility: hidden; pointer-events: none; }

.preloader .pl-brand {
  color: #fff; font-weight: 600; letter-spacing: 0.3em; font-size: 20px;
}

.preloader .pl-brand span { color: var(--orange); }

.preloader .pl-bar {
  width: 160px; height: 3px; background: rgba(255,255,255,0.15);
  margin-top: 20px; overflow: hidden;
}

.preloader .pl-bar i {
  display: block; height: 100%; width: 40%; background: var(--orange);
  animation: plmove 1s linear infinite;
}

@keyframes plmove { from { transform: translateX(-100%);} to { transform: translateX(400%);} }

@media (prefers-reduced-motion: reduce) {
  .preloader .pl-bar i { animation: none; width: 100%; }
}

/* ============ header ============ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 84px; gap: 24px;
}

.brand { display: flex; align-items: center; gap: 12px; }

.brand-badge {
  width: 42px; height: 42px; background: var(--navy); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 15px; letter-spacing: 0.05em;
  border-bottom: 3px solid var(--orange);
  flex: none;
}

.brand-texts { line-height: 1.25; }

.brand-name {
  font-weight: 700; font-size: 17px; letter-spacing: 0.08em; color: var(--navy);
  white-space: nowrap;
}

.brand-tag {
  font-size: 10.5px; letter-spacing: 0.24em; color: var(--muted); text-transform: uppercase;
}

.main-nav { display: flex; align-items: center; gap: 4px; }

.main-nav > li > a {
  display: block; padding: 12px 14px; font-size: 15px; color: var(--ink);
  position: relative; white-space: nowrap;
}

.main-nav > li > a::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 6px;
  height: 2px; background: var(--orange); transform: scaleX(0);
  transform-origin: left; transition: transform 0.25s ease;
}

.main-nav > li > a:hover::after,
.main-nav > li > a.active::after { transform: scaleX(1); }

.main-nav > li > a.active { color: var(--navy); font-weight: 600; }

/* dropdown */
.has-drop { position: relative; }

.has-drop > a .caret { font-size: 10px; margin-left: 5px; color: var(--muted); }

.dropdown {
  position: absolute; top: 100%; left: 0; min-width: 220px;
  background: #fff; border: 1px solid var(--line); border-top: 2px solid var(--orange);
  padding: 8px 0;
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
  box-shadow: 0 16px 40px rgba(20, 22, 50, 0.12);
}

.has-drop:hover .dropdown,
.has-drop.open .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }

.dropdown a {
  display: block; padding: 10px 20px; font-size: 14.5px; color: var(--ink);
  transition: background 0.18s ease, color 0.18s ease;
}

.dropdown a:hover { background: var(--light); color: var(--orange); }

.header-tools { display: flex; align-items: center; gap: 12px; }

.lang-toggle {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  padding: 8px 13px; cursor: pointer; transition: all 0.2s ease;
}

.lang-toggle:hover { border-color: var(--navy); color: var(--navy); }

.menu-btn {
  display: none; background: none; border: 1px solid var(--line);
  width: 42px; height: 42px; font-size: 19px; cursor: pointer; color: var(--navy);
}

/* ============ hero slider ============ */
.hero-slider { position: relative; overflow: hidden; background: var(--navy-deep); }

.slides { display: flex; transition: transform 0.7s cubic-bezier(0.65, 0, 0.35, 1); }

.slide {
  position: relative; flex: 0 0 100%;
  min-height: min(88vh, 820px);
  display: flex; align-items: center;
}

.slide-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.slide::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(13, 16, 40, 0.88) 0%, rgba(13, 16, 40, 0.55) 55%, rgba(13, 16, 40, 0.25) 100%);
}

.slide-inner { position: relative; z-index: 1; color: #fff; padding-top: 60px; padding-bottom: 60px; }

.slide-kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.3em;
  color: var(--orange); text-transform: uppercase; margin-bottom: 22px;
  display: flex; align-items: center; gap: 12px;
}

.slide-kicker::before { content: ""; width: 34px; height: 2px; background: var(--orange); }

.slide h2 {
  font-size: clamp(32px, 5vw, 60px); line-height: 1.12; font-weight: 700;
  max-width: 15ch; margin-bottom: 22px; letter-spacing: 0.01em;
}

.slide p { max-width: 52ch; color: rgba(255,255,255,0.82); font-size: 17px; margin-bottom: 36px; }

.slide-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.slider-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 2;
  width: 52px; height: 52px; border: 1px solid rgba(255,255,255,0.35);
  background: rgba(13,16,40,0.3); color: #fff; font-size: 20px; cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.slider-arrow:hover { background: var(--orange); border-color: var(--orange); }

.slider-prev { left: 26px; }
.slider-next { right: 26px; }

.slider-dots {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  z-index: 2; display: flex; gap: 10px;
}

.slider-dots button {
  width: 26px; height: 4px; border: none; background: rgba(255,255,255,0.35);
  cursor: pointer; transition: background 0.2s ease;
}

.slider-dots button.active { background: var(--orange); }

/* ============ buttons ============ */
.btn {
  display: inline-block; padding: 15px 32px; font-size: 15px; font-weight: 600;
  letter-spacing: 0.05em; cursor: pointer; border: 1px solid transparent;
  transition: background 0.22s ease, color 0.22s ease, border-color 0.22s ease, transform 0.1s ease;
  white-space: nowrap;
}

.btn:active { transform: scale(0.98); }

.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: var(--orange-dk); }

.btn-outline-light { border-color: rgba(255,255,255,0.6); color: #fff; }
.btn-outline-light:hover { background: #fff; color: var(--navy); border-color: #fff; }

.btn-navy { background: var(--navy); color: #fff; }
.btn-navy:hover { background: var(--navy-dark); }

.btn-outline-navy { border-color: var(--navy); color: var(--navy); }
.btn-outline-navy:hover { background: var(--navy); color: #fff; }

/* ============ sections ============ */
.section { padding: 96px 0; }
.section.alt { background: var(--light); }
.section.navy { background: var(--navy); color: #fff; }

.sec-head { margin-bottom: 54px; max-width: 760px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head.center .sec-kicker { justify-content: center; }

.sec-kicker {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.28em;
  text-transform: uppercase; color: var(--orange); margin-bottom: 14px;
  display: flex; align-items: center; gap: 12px;
}

.sec-kicker::before { content: ""; width: 30px; height: 2px; background: var(--orange); flex: none; }
.sec-head.center .sec-kicker::after { content: ""; width: 30px; height: 2px; background: var(--orange); flex: none; }

.sec-head h2 {
  font-size: clamp(28px, 3.4vw, 42px); font-weight: 700; color: var(--navy);
  line-height: 1.18; margin-bottom: 14px; letter-spacing: 0.01em;
}

.section.navy .sec-head h2 { color: #fff; }

.sec-head p { color: var(--muted); font-size: 16.5px; }
.section.navy .sec-head p { color: rgba(255,255,255,0.75); }

/* ============ why choose ============ */
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }

.why-card {
  background: #fff; border: 1px solid var(--line); border-bottom: 3px solid var(--orange);
  padding: 40px 32px; transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.section.alt .why-card:hover,
.why-card:hover { box-shadow: 0 22px 48px rgba(20, 22, 50, 0.12); transform: translateY(-4px); }

.why-num {
  font-family: var(--mono); font-size: 15px; color: var(--orange);
  letter-spacing: 0.12em; display: block; margin-bottom: 22px;
}

.why-card h3 { font-size: 21px; color: var(--navy); margin-bottom: 12px; }
.why-card p { font-size: 14.5px; color: var(--muted); }

/* ============ explore blocks ============ */
.explore-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }

.explore-item {
  position: relative; display: block; overflow: hidden; height: 380px;
  border-bottom: 3px solid var(--orange);
}

.explore-item img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.explore-item:hover img { transform: scale(1.06); }

.explore-item::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(13,16,40,0) 40%, rgba(13,16,40,0.9) 100%);
}

.explore-caption {
  position: absolute; left: 22px; right: 22px; bottom: 20px; z-index: 1; color: #fff;
}

.explore-caption h3 { font-size: 19px; margin-bottom: 4px; }

.explore-caption span {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--orange);
}

/* ============ product cards ============ */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }

.product-card {
  background: #fff; border: 1px solid var(--line);
  transition: box-shadow 0.25s ease; display: flex; flex-direction: column;
}

.product-card:hover { box-shadow: 0 22px 48px rgba(20, 22, 50, 0.12); }

.product-thumb { height: 230px; overflow: hidden; }

.product-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.product-card:hover .product-thumb img { transform: scale(1.07); }

.product-body { padding: 26px 24px 28px; flex: 1; display: flex; flex-direction: column; }

.product-body h3 { font-size: 19px; color: var(--navy); margin-bottom: 8px; }

.product-body p { font-size: 14px; color: var(--muted); flex: 1; }

.product-link {
  margin-top: 18px; font-size: 13.5px; font-weight: 600; color: var(--orange);
  display: inline-flex; align-items: center; gap: 7px;
}

.product-link .arr { transition: transform 0.2s ease; }
.product-card:hover .arr { transform: translateX(5px); }

/* ============ stats band ============ */
.stats-band { background: var(--navy); color: #fff; border-top: 3px solid var(--orange); }

.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }

.stat { padding: 52px 32px; border-left: 1px solid rgba(255,255,255,0.12); text-align: center; }
.stat:first-child { border-left: none; }

.stat-num {
  font-family: var(--mono); font-size: clamp(34px, 3.6vw, 50px); font-weight: 700;
  color: var(--orange); line-height: 1.1;
}

.stat-label { margin-top: 10px; font-size: 14px; color: rgba(255,255,255,0.75); }

/* ============ catalog band ============ */
.catalog-band { background: var(--orange); color: #fff; }

.catalog-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 32px; padding: 60px 0; flex-wrap: wrap;
}

.catalog-inner h2 { font-size: clamp(24px, 2.8vw, 36px); font-weight: 700; max-width: 26ch; line-height: 1.25; }
.catalog-inner p { margin-top: 8px; color: rgba(255,255,255,0.85); max-width: 60ch; }

.btn-white { background: #fff; color: var(--orange); }
.btn-white:hover { background: var(--navy); color: #fff; }

/* ============ page banner ============ */
.page-banner {
  position: relative; min-height: 340px; display: flex; align-items: center;
  background: var(--navy-deep); color: #fff; overflow: hidden;
}

.page-banner img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.page-banner::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(13,16,40,0.9), rgba(13,16,40,0.5));
}

.page-banner .container { position: relative; z-index: 1; padding-top: 60px; padding-bottom: 60px; }

.crumb {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--orange); margin-bottom: 16px;
}

.page-banner h1 { font-size: clamp(32px, 4.4vw, 54px); font-weight: 700; letter-spacing: 0.01em; }

.page-banner p { margin-top: 12px; color: rgba(255,255,255,0.8); max-width: 60ch; }

/* ============ about page ============ */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }

.two-col h2 { font-size: clamp(26px, 3vw, 38px); color: var(--navy); margin-bottom: 18px; line-height: 1.2; }
.two-col p { color: var(--muted); margin-bottom: 14px; }

.frame-img { position: relative; }
.frame-img::before {
  content: ""; position: absolute; top: -16px; left: -16px;
  width: 90px; height: 90px; border-top: 3px solid var(--orange); border-left: 3px solid var(--orange);
}
.frame-img img { width: 100%; min-height: 380px; object-fit: cover; position: relative; }

.check-list li {
  padding: 9px 0 9px 30px; position: relative; color: var(--ink); font-size: 15px;
}

.check-list li::before {
  content: ""; position: absolute; left: 0; top: 15px;
  width: 14px; height: 8px;
  border-left: 2.5px solid var(--orange); border-bottom: 2.5px solid var(--orange);
  transform: rotate(-45deg);
}

/* factory cards */
.factory-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }

.factory-card {
  background: #fff; border: 1px solid var(--line); padding: 34px 28px;
  border-top: 3px solid var(--orange); transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.factory-card:hover { box-shadow: 0 20px 44px rgba(20, 22, 50, 0.12); transform: translateY(-4px); }

.factory-card .f-code {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.2em; color: var(--orange);
  display: block; margin-bottom: 16px;
}

.factory-card h3 { font-size: 20px; color: var(--navy); margin-bottom: 10px; }
.factory-card p { font-size: 14px; color: var(--muted); }

/* ============ applications ============ */
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }

.app-card {
  position: relative; display: block; overflow: hidden; height: 300px;
}

.app-card img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.app-card:hover img { transform: scale(1.06); }

.app-card::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(13,16,40,0.05) 40%, rgba(13,16,40,0.88) 100%);
  transition: background 0.3s ease;
}

.app-card .app-caption {
  position: absolute; left: 22px; right: 22px; bottom: 18px; z-index: 1; color: #fff;
}

.app-card .app-caption span {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--orange);
}

.app-card .app-caption h3 { font-size: 20px; margin-top: 2px; }

.app-strip { display: flex; flex-wrap: wrap; gap: 12px; }

.app-chip {
  border: 1px solid var(--line); background: #fff; padding: 10px 20px;
  font-size: 14px; color: var(--ink); transition: all 0.2s ease;
}

.app-chip:hover { border-color: var(--orange); color: var(--orange); }

/* ============ product detail ============ */
.pd-layout { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }

.pd-layout .frame-img img { min-height: 460px; }

.pd-body h2 { font-size: clamp(26px, 3vw, 38px); color: var(--navy); margin-bottom: 6px; }
.pd-body .pd-en {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--orange); display: block; margin-bottom: 20px;
}
.pd-body p { color: var(--muted); margin-bottom: 14px; }

.spec-table { width: 100%; border-collapse: collapse; margin: 26px 0 8px; }
.spec-table td {
  padding: 13px 16px; border: 1px solid var(--line); font-size: 14.5px; vertical-align: top;
}
.spec-table td:first-child {
  width: 34%; background: var(--light); color: var(--navy); font-weight: 600;
}

/* ============ gallery ============ */
.gallery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

.gallery-item {
  position: relative; overflow: hidden; height: 260px; display: block;
}

.gallery-item.tall { grid-row: span 2; height: auto; }

.gallery-item img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.gallery-item:hover img { transform: scale(1.07); }

.gallery-item::after {
  content: "+"; position: absolute; inset: 0;
  background: rgba(29, 34, 75, 0.55); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 34px; font-weight: 300;
  opacity: 0; transition: opacity 0.3s ease;
}

.gallery-item:hover::after { opacity: 1; }

/* ============ contact ============ */
.office-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }

.office-card {
  background: #fff; border: 1px solid var(--line); border-left: 3px solid var(--orange);
  padding: 30px 28px; transition: box-shadow 0.25s ease;
}

.office-card:hover { box-shadow: 0 18px 40px rgba(20, 22, 50, 0.1); }

.office-card .o-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--orange); display: block; margin-bottom: 12px;
}

.office-card h3 { font-size: 19px; color: var(--navy); margin-bottom: 10px; }
.office-card p { font-size: 14px; color: var(--muted); }
.office-card p b { color: var(--ink); font-weight: 600; }

.contact-layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 64px; align-items: start; }

.form-card { background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--orange); padding: 40px 36px; }

.form-row { margin-bottom: 20px; }
.form-row label { display: block; font-size: 13.5px; color: var(--navy); font-weight: 600; margin-bottom: 7px; }
.form-row input, .form-row select, .form-row textarea {
  width: 100%; border: 1px solid var(--line); background: var(--light);
  padding: 13px 14px; font-family: var(--font); font-size: 15px; color: var(--ink);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.form-row textarea { min-height: 130px; resize: vertical; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none; border-color: var(--orange); background: #fff;
}
.form-row .field-error { display: none; color: #c9302c; font-size: 12.5px; margin-top: 6px; }
.form-row.invalid .field-error { display: block; }
.form-row.invalid input, .form-row.invalid textarea, .form-row.invalid select { border-color: #c9302c; }

.form-success { display: none; border: 1px solid var(--orange); background: #fff; padding: 32px; }
.form-success.show { display: block; }
.form-success h3 { color: var(--navy); margin-bottom: 8px; font-size: 19px; }
.form-success p { color: var(--muted); font-size: 14px; }

.info-list li {
  display: flex; gap: 16px; padding: 18px 0; border-bottom: 1px solid var(--line);
  align-items: flex-start;
}

.info-list .i-badge {
  flex: none; width: 42px; height: 42px; background: var(--navy); color: var(--orange);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em;
}

.info-list h4 { font-size: 15px; color: var(--navy); margin-bottom: 3px; }
.info-list p { font-size: 14px; color: var(--muted); }
.info-list a { color: var(--orange); }

/* ============ footer ============ */
.site-footer { background: var(--navy); color: rgba(255,255,255,0.75); }

.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 48px;
  padding: 76px 0 56px;
}

.footer-about .brand-name { color: #fff; }
.footer-about p { font-size: 14px; margin: 18px 0 22px; max-width: 36ch; }

.social-row { display: flex; gap: 10px; }

.social-row a {
  width: 40px; height: 40px; border: 1px solid rgba(255,255,255,0.25);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.05em; color: #fff;
  transition: all 0.2s ease;
}

.social-row a:hover { background: var(--orange); border-color: var(--orange); }

.footer-col h4 {
  color: #fff; font-size: 16px; margin-bottom: 20px; font-weight: 600;
  padding-bottom: 12px; position: relative;
}

.footer-col h4::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 30px; height: 2px; background: var(--orange);
}

.footer-col ul li { margin-bottom: 11px; }
.footer-col a { font-size: 14px; transition: color 0.18s ease, padding-left 0.18s ease; }
.footer-col a:hover { color: var(--orange); padding-left: 5px; }
.footer-col p { font-size: 14px; margin-bottom: 11px; }
.footer-col p b { color: #fff; font-weight: 600; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 22px 0; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 13px; color: rgba(255,255,255,0.5);
}

.footer-bottom a { color: var(--orange); }

/* ============ reveal ============ */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.65s ease, transform 0.65s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .slides { transition: none; }
  html { scroll-behavior: auto; }
}

/* ============ responsive ============ */
@media (max-width: 1024px) {
  .why-grid, .app-grid, .office-grid { grid-template-columns: 1fr 1fr; }
  .explore-grid { grid-template-columns: 1fr 1fr; }
  .product-grid, .factory-grid { grid-template-columns: 1fr 1fr; }
  .gallery-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 880px) {
  .menu-btn { display: block; }
  .main-nav {
    display: none; position: absolute; top: 84px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; background: #fff;
    border-bottom: 1px solid var(--line); padding: 10px 0;
    box-shadow: 0 24px 48px rgba(20,22,50,0.14);
  }
  .main-nav.open { display: flex; }
  .main-nav > li > a { padding: 14px 24px; }
  .main-nav > li > a::after { display: none; }
  .dropdown {
    position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: none; border-left: 2px solid var(--orange); margin-left: 24px;
    display: none;
  }
  .has-drop.open .dropdown { display: block; }
  .two-col, .pd-layout, .contact-layout { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat { border-left: none; border-top: 1px solid rgba(255,255,255,0.12); padding: 36px 20px; }
  .stat:nth-child(-n+2) { border-top: none; }
  .slider-arrow { display: none; }
  .section { padding: 68px 0; }
}

@media (max-width: 560px) {
  .why-grid, .app-grid, .office-grid, .product-grid, .factory-grid,
  .explore-grid, .gallery-grid, .footer-grid { grid-template-columns: 1fr; }
  .gallery-item.tall { grid-row: auto; height: 260px; }
  .explore-item { height: 300px; }
  .catalog-inner { flex-direction: column; align-items: flex-start; }
  .brand-tag { display: none; }
  .slide { min-height: 520px; }
}