:root {
  --navy-900: #081a30;
  --navy-800: #0b2444;
  --navy-700: #10315c;
  --blue-600: #1667d8;
  --blue-500: #1a82e2;
  --blue-400: #3f9bf0;
  --orange-500: #f28c28;
  --ink-900: #0e1b2c;
  --ink-700: #3a4a5e;
  --ink-500: #64748b;
  --line: #e3eaf3;
  --bg: #f5f8fc;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(11, 36, 68, 0.10);
  --shadow-lg: 0 24px 60px rgba(11, 36, 68, 0.18);
  --maxw: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", "Hiragino Sans", "Noto Sans", sans-serif;
  color: var(--ink-900);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; gap: 28px;
  height: 72px; max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
}
.logo img { height: 46px; width: auto; }
.main-nav { display: flex; gap: 6px; margin-left: 12px; flex: 1; }
.main-nav a {
  padding: 8px 14px; border-radius: 8px; font-weight: 600; font-size: 15px;
  color: var(--ink-700); transition: all .18s;
}
.main-nav a:hover { color: var(--blue-600); background: #eaf3fd; }
.main-nav a.active { color: var(--blue-600); background: #eaf3fd; }
.header-actions { display: flex; align-items: center; gap: 14px; }

.lang-select {
  appearance: none; border: 1px solid var(--line); background: var(--white);
  padding: 8px 30px 8px 12px; border-radius: 8px; font-size: 14px; font-weight: 600;
  color: var(--ink-700); cursor: pointer;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%233a4a5e' stroke-width='2' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center;
}
.lang-select:hover { border-color: var(--blue-400); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 10px; font-weight: 700; font-size: 15px;
  cursor: pointer; border: none; transition: all .18s;
}
.btn-primary { background: var(--blue-600); color: #fff; box-shadow: 0 6px 18px rgba(22,103,216,.35); }
.btn-primary:hover { background: #1157bb; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.55); }
.btn-ghost:hover { background: rgba(255,255,255,.12); border-color: #fff; }
.btn-outline { background: transparent; color: var(--blue-600); border: 1.5px solid var(--blue-600); }
.btn-outline:hover { background: #eaf3fd; }
.btn-sm { padding: 8px 16px; font-size: 14px; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle svg { width: 26px; height: 26px; stroke: var(--ink-700); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: #0d2646;   /* 兜底色，渐变由每张幻灯片提供 */
  color: #fff;
}
.hero::before {
  content: ""; position: absolute; inset: 0; opacity: .16; z-index: 2; pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,.5) 1px, transparent 0);
  background-size: 34px 34px;
}
.hero-slides { display: grid; }
.hero-slide {
  grid-area: 1 / 1; position: relative; overflow: hidden;
  opacity: 0; transition: opacity .9s ease; pointer-events: none;
  background: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-700) 55%, #123a72 100%);
}
.hero-slide.active { opacity: 1; pointer-events: auto; }
.hero-slide::after {
  content: ""; position: absolute; right: -140px; top: -140px;
  width: 560px; height: 560px; border-radius: 50%; pointer-events: none;
  background: radial-gradient(circle, rgba(26,130,226,.35) 0%, transparent 65%);
}
.hero-slide[data-theme="b"] { background: linear-gradient(135deg, #081a30 0%, #0d2f5e 55%, #1a4b8c 100%); }
.hero-slide[data-theme="b"]::after { background: radial-gradient(circle, rgba(64,156,255,.32) 0%, transparent 65%); }
.hero-slide[data-theme="c"] { background: linear-gradient(135deg, #07202c 0%, #0d3a4a 55%, #0f5a66 100%); }
.hero-slide[data-theme="c"]::after { background: radial-gradient(circle, rgba(38,190,180,.26) 0%, transparent 65%); }
.hero-slide[data-theme="d"] { background: linear-gradient(135deg, #101430 0%, #1c2050 55%, #2c3480 100%); }
.hero-slide[data-theme="d"]::after { background: radial-gradient(circle, rgba(122,132,255,.30) 0%, transparent 65%); }
.hero-inner {
  position: relative; z-index: 1;
  max-width: var(--maxw); margin: 0 auto; padding: 92px 24px 108px;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.22);
  padding: 7px 16px; border-radius: 999px; font-size: 13.5px; font-weight: 600;
  letter-spacing: .04em; color: #cfe3fb; margin-bottom: 22px;
}
.hero h1 { font-size: clamp(34px, 4.6vw, 54px); line-height: 1.14; font-weight: 800; letter-spacing: -.01em; }
.hero h1 .accent { color: var(--blue-400); }
.hero p.lead { margin-top: 20px; font-size: 17.5px; color: #b9cde6; max-width: 560px; }
.hero-cta { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  margin-top: 52px; padding-top: 30px; border-top: 1px solid rgba(255,255,255,.14);
}
.hero-stats .num { font-size: 30px; font-weight: 800; color: #fff; }
.hero-stats .num span { color: var(--blue-400); }
.hero-stats .lbl { font-size: 13px; color: #8fb0d6; margin-top: 2px; }

.hero-visual {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 20px; padding: 22px;
  box-shadow: var(--shadow-lg);
}
.hero-visual img { border-radius: 12px; width: 100%; height: 300px; object-fit: contain; background: #fff; }
.hero-visual .cap { margin-top: 12px; font-size: 13px; color: #a8c4e4; text-align: center; }

/* ---------- Hero slider controls ---------- */
.hero-controls {
  position: absolute; z-index: 3; left: 50%; bottom: 30px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 16px;
}
.hero-arrow {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.25);
  color: #fff; cursor: pointer; transition: background .2s, transform .2s;
}
.hero-arrow svg { width: 18px; height: 18px; }
.hero-arrow:hover { background: rgba(255,255,255,.24); transform: scale(1.06); }
.hero-dots { display: flex; gap: 9px; }
.hero-dots .dot {
  width: 9px; height: 9px; border-radius: 50%; padding: 0;
  background: rgba(255,255,255,.35); border: none; cursor: pointer;
  transition: background .25s, transform .25s;
}
.hero-dots .dot.on { background: var(--blue-400); transform: scale(1.25); }

/* ---------- Sections ---------- */
.section { padding: 84px 0; }
.section.alt { background: var(--white); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.eyebrow {
  display: inline-block; color: var(--blue-600); font-weight: 800; font-size: 13px;
  letter-spacing: .14em; text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(26px, 3.2vw, 38px); font-weight: 800; color: var(--navy-800); letter-spacing: -.01em; }
.section-head p { margin-top: 14px; color: var(--ink-500); font-size: 16.5px; }

.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Cards */
.card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: all .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #cfe0f5; }
.card .icon {
  width: 52px; height: 52px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #eaf3fd, #dbeafd); color: var(--blue-600); margin-bottom: 18px;
}
.card .icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 18px; color: var(--navy-800); margin-bottom: 8px; }
.card p { font-size: 14.5px; color: var(--ink-500); }

/* Category tiles */
.cat-card {
  position: relative; overflow: hidden; background: var(--white);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px;
  transition: all .2s; cursor: pointer;
}
.cat-card:hover { border-color: var(--blue-400); box-shadow: var(--shadow); transform: translateY(-4px); }
.cat-card::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 3px; width: 0;
  background: linear-gradient(90deg, var(--blue-500), var(--orange-500)); transition: width .25s;
}
.cat-card:hover::after { width: 100%; }
.cat-card .count { position: absolute; top: 18px; right: 20px; font-size: 12.5px; font-weight: 700; color: var(--blue-600); background: #eaf3fd; padding: 3px 10px; border-radius: 999px; }
.cat-card h3 { font-size: 17.5px; color: var(--navy-800); margin: 14px 0 8px; }
.cat-card p { font-size: 14px; color: var(--ink-500); }

/* shared icon badge */
.cat-card .icon, .sol-card .icon, .value-card .icon {
  width: 52px; height: 52px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #eaf3fd, #dbeafd); color: var(--blue-600);
}
.cat-card .icon svg, .sol-card .icon svg, .value-card .icon svg { width: 26px; height: 26px; }

/* Products */
.prod-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.prod-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; cursor: pointer; transition: all .2s; display: flex; flex-direction: column;
}
.prod-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: #cfe0f5; }
.prod-card .thumb { background: #f8fafd; padding: 18px; aspect-ratio: 4/3; display: flex; align-items: center; justify-content: center; }
.prod-card .thumb img { max-height: 100%; object-fit: contain; mix-blend-mode: multiply; }
.prod-card .body { padding: 18px 20px 22px; border-top: 1px solid var(--line); flex: 1; display: flex; flex-direction: column; }
.prod-card .model { font-size: 12px; font-weight: 800; letter-spacing: .06em; color: var(--blue-600); }
.prod-card h3 { font-size: 16px; color: var(--navy-800); margin-top: 6px; flex: 1; }
.prod-card .meta { margin-top: 12px; display: flex; justify-content: space-between; align-items: center; }
.prod-card .meta .tag { font-size: 12.5px; color: var(--ink-500); }
.prod-card .meta .link { font-size: 13.5px; font-weight: 700; color: var(--blue-600); }

.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-bottom: 38px; }
.filter-bar button {
  padding: 9px 18px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--white); font-weight: 600; font-size: 14px; color: var(--ink-700); cursor: pointer; transition: all .15s;
}
.filter-bar button:hover { border-color: var(--blue-400); color: var(--blue-600); }
.filter-bar button.active { background: var(--blue-600); border-color: var(--blue-600); color: #fff; }

/* Modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(8,26,48,.6); z-index: 200;
  display: none; align-items: center; justify-content: center; padding: 24px;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--white); border-radius: 18px; max-width: 960px; width: 100%;
  max-height: 88vh; overflow: auto; box-shadow: var(--shadow-lg);
}
.modal-head { display: flex; justify-content: space-between; align-items: flex-start; padding: 26px 30px 0; }
.modal-head .model { font-size: 13px; font-weight: 800; color: var(--blue-600); letter-spacing: .06em; }
.modal-head h3 { font-size: 22px; color: var(--navy-800); margin-top: 4px; }
.modal-close { background: none; border: none; cursor: pointer; padding: 6px; }
.modal-close svg { width: 24px; height: 24px; stroke: var(--ink-500); }
.modal-body { padding: 20px 30px 34px; }
.modal-body .desc { color: var(--ink-700); font-size: 15px; margin-bottom: 24px; }
.modal-cols { display: grid; grid-template-columns: 1fr 1.3fr; gap: 28px; align-items: start; }
.modal-cols .img-wrap { background: #f8fafd; border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.modal-cols .img-wrap img { mix-blend-mode: multiply; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.spec-table th, .spec-table td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec-table th { color: var(--ink-500); font-weight: 600; width: 42%; }
.spec-table td { color: var(--ink-900); }
.spec-table .group td { background: #eaf3fd; color: var(--blue-600); font-weight: 800; font-size: 12.5px; letter-spacing: .05em; text-transform: uppercase; }
.modal-cta { margin-top: 26px; display: flex; gap: 12px; flex-wrap: wrap; }

/* Solutions */
.sol-card { position: relative; border-radius: var(--radius); overflow: hidden; background: var(--white); border: 1px solid var(--line); transition: all .2s; }
.sol-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.sol-card .top { height: 4px; background: linear-gradient(90deg, var(--blue-500), var(--orange-500)); }
.sol-card .inner { padding: 26px; }
.sol-card h3 { font-size: 17.5px; color: var(--navy-800); margin: 14px 0 8px; }
.sol-card p { font-size: 14.5px; color: var(--ink-500); }

/* About strip */
.about-strip { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.about-strip .img-wrap { border-radius: 18px; overflow: hidden; box-shadow: var(--shadow); background: linear-gradient(135deg, var(--navy-800), var(--navy-600)); padding: 40px; }
.about-strip .img-wrap img { filter: brightness(1.05); }
.about-strip h2 { font-size: clamp(24px, 3vw, 34px); color: var(--navy-800); font-weight: 800; margin-bottom: 16px; }
.about-strip p { color: var(--ink-500); font-size: 15.5px; margin-bottom: 14px; }
.check-list { margin-top: 18px; display: grid; gap: 10px; }
.check-list li { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; color: var(--ink-700); }
.check-list svg { width: 20px; height: 20px; flex-shrink: 0; margin-top: 2px; color: var(--blue-600); }

/* Value cards */
.value-card { text-align: left; }
.value-card .num { font-size: 42px; font-weight: 800; color: var(--blue-600); opacity: .22; line-height: 1; margin-bottom: 14px; }

/* CTA band */
.cta-band {
  background: linear-gradient(120deg, var(--navy-900), var(--navy-700)); color: #fff;
  border-radius: 20px; padding: 54px 48px; display: flex; align-items: center;
  justify-content: space-between; gap: 30px; flex-wrap: wrap; box-shadow: var(--shadow-lg);
}
.cta-band h2 { font-size: clamp(22px, 2.8vw, 32px); font-weight: 800; }
.cta-band p { color: #a8c4e4; margin-top: 10px; max-width: 560px; }
.cta-band .actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Contact */
.contact-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 40px; align-items: start; }
.info-card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px; display: flex; gap: 16px; align-items: flex-start; margin-bottom: 16px; transition: border-color .2s;
}
.info-card:hover { border-color: var(--blue-400); }
.info-card .icon {
  width: 46px; height: 46px; flex-shrink: 0; border-radius: 12px; background: #eaf3fd;
  color: var(--blue-600); display: flex; align-items: center; justify-content: center;
}
.info-card .icon svg { width: 22px; height: 22px; }
.info-card .lbl { font-size: 12.5px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-500); }
.info-card .val { font-size: 15.5px; color: var(--navy-800); font-weight: 600; margin-top: 3px; }
.info-card .val a:hover { color: var(--blue-600); }

.form-card { background: var(--white); border: 1px solid var(--line); border-radius: 18px; padding: 34px; box-shadow: var(--shadow); }
.form-card h3 { font-size: 20px; color: var(--navy-800); margin-bottom: 6px; }
.form-card .sub { font-size: 14px; color: var(--ink-500); margin-bottom: 24px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 13.5px; font-weight: 700; color: var(--ink-700); }
.form-field label .req { color: var(--orange-500); }
.form-field input, .form-field select, .form-field textarea {
  border: 1px solid var(--line); border-radius: 10px; padding: 11px 14px; font-size: 14.5px;
  font-family: inherit; color: var(--ink-900); background: #fbfdff; transition: border-color .15s, box-shadow .15s;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--blue-500); box-shadow: 0 0 0 3px rgba(26,130,226,.14); background: #fff;
}
.form-field textarea { min-height: 130px; resize: vertical; }
.form-foot { margin-top: 20px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.form-note { font-size: 12.5px; color: var(--ink-500); }
.form-status { margin-top: 14px; font-size: 14px; font-weight: 600; display: none; padding: 12px 16px; border-radius: 10px; }
.form-status.ok { display: block; background: #e8f7ee; color: #157a3c; border: 1px solid #bfe8cf; }
.form-status.err { display: block; background: #fdeeee; color: #b02a2a; border: 1px solid #f3c8c8; }
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; overflow: hidden; }

/* Footer */
.site-footer { background: var(--navy-900); color: #9db4d2; margin-top: 90px; }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 64px 24px 34px;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px;
}
.footer-inner .brand img { height: 42px; filter: brightness(0) invert(1); opacity: .95; }
.footer-inner .brand p { margin-top: 16px; font-size: 13.5px; line-height: 1.7; max-width: 340px; }
.footer-inner h4 { color: #fff; font-size: 14.5px; font-weight: 700; margin-bottom: 16px; letter-spacing: .03em; }
.footer-inner ul li { margin-bottom: 10px; font-size: 13.5px; }
.footer-inner ul a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 3px; color: var(--blue-400); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.10); max-width: var(--maxw); margin: 0 auto;
  padding: 20px 24px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px;
}

/* ---------- RTL (Arabic) ---------- */
[dir="rtl"] .main-nav a { letter-spacing: 0; }
[dir="rtl"] .eyebrow, [dir="rtl"] .hero-badge { letter-spacing: 0; }
[dir="rtl"] .footer-inner .brand img { margin-right: 0; }
[dir="rtl"] .hero-arrow svg { transform: scaleX(-1); }
[dir="rtl"] select.lang-select { text-align: right; text-align-last: right; }
[dir="rtl"] .footer-contact svg { margin-top: 3px; }

/* ---------- Social links ---------- */
.social-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.social-row a {
  width: 38px; height: 38px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,.09); color: #cfe0f5;
  transition: background .25s, color .25s, transform .25s;
}
.social-row a { box-shadow: 0 1px 3px rgba(0,0,0,.18); }
.social-row a:hover { filter: brightness(1.12); transform: translateY(-2px); }
.social-row svg { width: 17px; height: 17px; }
/* 品牌官方配色 */
.social-row a.so-fb { background: #1877F2; color: #fff; }
.social-row a.so-ig { background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285AEB 90%); color: #fff; }
.social-row a.so-li { background: #0A66C2; color: #fff; }
.social-row a.so-yt { background: #FF0000; color: #fff; }
.social-row a.so-tt { background: #010101; color: #fff; }
.social-row a.so-wa { background: #25D366; color: #fff; }
/* 浅色背景（联系页）同样使用品牌色 */
.social-row.light a { background: #eef3fa; color: var(--navy-700); }
.social-row.light a.so-fb, .social-row.light a.so-ig, .social-row.light a.so-li,
.social-row.light a.so-yt, .social-row.light a.so-tt, .social-row.light a.so-wa { color: #fff; }
.social-row.light a.so-fb { background: #1877F2; }
.social-row.light a.so-li { background: #0A66C2; }
.social-row.light a.so-yt { background: #FF0000; }
.social-row.light a.so-tt { background: #010101; }
.social-row.light a.so-wa { background: #25D366; }
.social-row.light a.so-ig { background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285AEB 90%); }
.follow-card .social-row { margin-top: 8px; }
.follow-card .val { display: block; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 1020px) {
  .prod-grid, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .hero-inner { grid-template-columns: 1fr; padding-top: 64px; }
  .hero-visual { max-width: 520px; }
  .contact-layout { grid-template-columns: 1fr; }
  .about-strip { grid-template-columns: 1fr; }
  .modal-cols { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .hero-arrow { display: none; }
  .hero-controls { bottom: 18px; }
  .main-nav {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 14px 20px 20px;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow); margin-left: 0;
  }
  .main-nav.open { display: flex; }
  .nav-toggle { display: block; }
  .grid-3, .grid-4, .prod-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .cta-band { padding: 36px 28px; }
  .header-actions .btn-primary { display: none; }
  .section { padding: 60px 0; }
}