@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700;900&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  --ink: #0b1c2c;
  --muted: #5a6b7a;
  --line: #d9e2ea;
  --bg: #f4f7fa;
  --surface: #ffffff;
  --brand: #0b4f8a;
  --brand-deep: #083a66;
  --accent: #1bb8d8;
  --accent-2: #e8a317;
  --max: 1180px;
  --font-cn: 'Noto Sans SC', sans-serif;
  --font-en: 'Outfit', sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-cn);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(217,226,234,.9);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; min-height: 96px;
  padding: 10px 0;
}
.logo { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; max-width: min(420px, 55vw); }
.logo img {
  height: 72px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
}
.logo-fallback {
  font-family: var(--font-en);
  font-weight: 800;
  font-size: 20px;
  color: var(--brand);
  letter-spacing: .02em;
}
.nav {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: flex-end;
}
.nav a {
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: #334554;
  border-radius: 8px;
  transition: color .2s ease, background .2s ease;
}
.nav a:hover, .nav a.is-active { color: var(--brand); background: rgba(11,79,138,.06); }
.nav .lang {
  margin-left: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--muted);
}
.nav .lang button {
  border: 0; background: transparent; cursor: pointer;
  font: inherit; color: inherit; padding: 0 4px;
}
.nav .lang button.is-on { color: var(--brand); }
.nav .lang .sep { opacity: .45; margin: 0 2px; }
.menu-toggle {
  display: none; border: 1px solid var(--line); background: #fff;
  border-radius: 8px; padding: 8px 10px; cursor: pointer;
}

/* Hero */
.hero {
  position: relative;
  min-height: min(72vh, 640px);
  display: grid;
  align-items: end;
  overflow: hidden;
  background: #071624;
}
.hero-media {
  position: absolute; inset: 0;
}
.hero-media img {
  width: 100%; height: 100%; object-fit: cover;
  transform: scale(1.02);
  animation: heroZoom 14s ease-in-out infinite alternate;
}
@keyframes heroZoom {
  from { transform: scale(1.02); }
  to { transform: scale(1.08); }
}
.hero-mask {
  position: absolute; inset: 0;
  background:
    linear-gradient(105deg, rgba(7,22,36,.82) 8%, rgba(7,22,36,.35) 55%, rgba(7,22,36,.55) 100%);
}

.hero-content {
  position: relative; z-index: 3;
  padding: 72px 0 64px;
  color: #fff;
  max-width: 720px;
}
.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  font-weight: 700;
}
.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -.02em;
}
.hero p {
  margin: 0 0 28px;
  font-size: 16px;
  color: rgba(255,255,255,.86);
  max-width: 34em;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 22px; border-radius: 999px;
  font-weight: 700; font-size: 14px;
  transition: transform .2s ease, background .2s ease, color .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #06212a; }
.btn-primary:hover { background: #39cceb; }
.btn-ghost {
  background: rgba(255,255,255,.08);
  color: #fff;
  border: 1px solid rgba(255,255,255,.35);
}
.btn-ghost:hover { background: rgba(255,255,255,.16); }

/* Sections */
.section { padding: 72px 0; }
.section.alt { background: #fff; }
.section-head { text-align: center; margin-bottom: 36px; }
.section-head h2 {
  margin: 0 0 10px;
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 900;
  letter-spacing: -.01em;
}
.section-head p {
  margin: 0 auto;
  max-width: 640px;
  color: var(--muted);
  font-size: 15px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.product-card {
  display: block;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(11, 40, 70, .1);
}
.product-card .pic {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: #e8eef3;
}
.product-card .pic img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .45s ease;
}
.product-card:hover .pic img { transform: scale(1.05); }
.product-card .body { padding: 16px 16px 18px; }
.product-card h3 { margin: 0 0 6px; font-size: 17px; font-weight: 700; }
.product-card p { margin: 0; color: var(--muted); font-size: 13px; }
.product-card .more {
  display: inline-block; margin-top: 10px;
  color: var(--brand); font-size: 13px; font-weight: 700;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.solution-item {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  min-height: 220px;
  color: #fff;
}
.solution-item img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
}
.solution-item .shade {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(8,30,48,.15), rgba(8,30,48,.78));
}
.solution-item .txt {
  position: relative; z-index: 1;
  padding: 22px;
  height: 100%;
  display: flex; flex-direction: column; justify-content: flex-end;
}
.solution-item h3 { margin: 0 0 4px; font-size: 20px; }
.solution-item p { margin: 0; font-size: 13px; color: rgba(255,255,255,.85); }

.oem {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 28px;
  align-items: center;
}
.oem-copy h2 { margin: 0 0 12px; font-size: 32px; font-weight: 900; }
.oem-copy p { margin: 0 0 14px; color: var(--muted); }
.oem-list { margin: 0; padding: 0; list-style: none; }
.oem-list li {
  position: relative;
  padding: 8px 0 8px 18px;
  color: #2c3c4a;
}
.oem-list li::before {
  content: '';
  position: absolute; left: 0; top: 16px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
}
.oem-visual {
  border-radius: 18px; overflow: hidden;
  box-shadow: 0 18px 40px rgba(11,40,70,.12);
}
.oem-visual img { width: 100%; height: 100%; object-fit: cover; min-height: 280px; }

.contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: stretch;
}
.contact-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
}
.contact-card h3 { margin: 0 0 16px; font-size: 22px; }
.contact-row { margin: 0 0 12px; color: #334554; }
.contact-row strong { display: block; color: var(--ink); margin-bottom: 2px; }
.contact-map {
  border-radius: 18px; overflow: hidden; min-height: 280px;
}
.contact-map img { width: 100%; height: 100%; object-fit: cover; min-height: 280px; }

.site-footer {
  background: #071624;
  color: rgba(255,255,255,.72);
  padding: 28px 0;
  font-size: 13px;
}
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 12px;
  justify-content: space-between; align-items: center;
}
.site-footer strong { color: #fff; }

[data-i18n] { }
.lang-en body, html[lang="en"] body { font-family: var(--font-en), var(--font-cn); }
html[lang="en"] .hero h1,
html[lang="en"] .section-head h2,
html[lang="en"] .oem-copy h2 { font-family: var(--font-en); }

@media (max-width: 960px) {
  .product-grid, .solution-grid { grid-template-columns: 1fr 1fr; }
  .oem, .contact { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .header-inner { min-height: 78px; padding: 8px 0; }
  .logo img { height: 56px; }
  .menu-toggle { display: inline-flex; }
  .nav {
    display: none;
    position: absolute; left: 20px; right: 20px; top: 96px;
    background: #fff; border: 1px solid var(--line);
    border-radius: 12px; padding: 10px; flex-direction: column; align-items: stretch;
    box-shadow: 0 12px 30px rgba(0,0,0,.08);
  }
  .nav.is-open { display: flex; }
  .nav .lang { border-left: 0; margin: 8px 0 0; padding: 8px 14px; border-top: 1px solid var(--line); }
  .product-grid, .solution-grid { grid-template-columns: 1fr; }
  .hero { min-height: 520px; }
}