:root {
  --navy-900: #04101f;
  --navy-800: #071a30;
  --navy-700: #0a2540;
  --navy-600: #123455;
  --blue: #2f7bff;
  --blue-light: #4da3ff;
  --cyan: #38bdf8;
  --gold: #d8b45a;
  --text: #e8eef6;
  --text-dim: #9fb0c3;
  --white: #ffffff;
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--navy-900);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: rgba(4, 16, 31, .82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; }
.brand-logo { height: 44px; width: auto; }
.brand-mark {
  font-size: 24px; font-weight: 500; letter-spacing: 4px; color: var(--white);
  border-bottom: 2px solid var(--blue); padding-bottom: 2px;
}
.brand-sub { font-size: 11px; letter-spacing: 3px; color: var(--text-dim); }
.nav { display: flex; gap: 32px; }
.nav a { font-size: 15px; color: var(--text-dim); transition: color .2s; position: relative; padding: 6px 0; }
.nav a:hover { color: var(--white); }
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 2px;
  background: var(--blue); transition: width .25s;
}
.nav a:hover::after { width: 100%; }
.lang-switch {
  border: 1px solid rgba(255,255,255,.35); border-radius: 999px;
  padding: 4px 14px !important; font-size: 13px !important; color: var(--text) !important;
}
.lang-switch:hover { border-color: var(--cyan); color: var(--cyan) !important; }
.lang-switch::after { display: none; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; transition: .3s; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: 150px 0 90px;
  background: linear-gradient(180deg, var(--navy-900) 0%, var(--navy-800) 60%, var(--navy-900) 100%);
}
.hero-glow {
  position: absolute; top: -220px; right: -140px; width: 640px; height: 640px;
  background: radial-gradient(circle, rgba(47, 123, 255, .22) 0%, rgba(47, 123, 255, 0) 65%);
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero-tag {
  display: inline-block; font-size: 13px; letter-spacing: 2px; color: var(--cyan);
  border: 1px solid rgba(56, 189, 248, .4); border-radius: 999px; padding: 5px 16px; margin-bottom: 22px;
}
.hero-company { font-size: 40px; font-weight: 500; line-height: 1.3; color: var(--white); letter-spacing: 3px; }
.en-title { font-size: 33px; letter-spacing: 0; line-height: 1.35; }
.hero-slogan { margin-top: 12px; font-size: 20px; color: var(--cyan); letter-spacing: 4px; }
.hero-desc { margin: 22px 0 32px; color: var(--text-dim); font-size: 16px; max-width: 520px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual img { border-radius: var(--radius); border: 1px solid rgba(255,255,255,.1); }

.btn {
  display: inline-block; padding: 13px 34px; border-radius: 8px; font-size: 15px;
  transition: transform .2s, box-shadow .2s, background .2s;
}
.btn-primary { background: var(--blue); color: var(--white); }
.btn-primary:hover { background: var(--blue-light); transform: translateY(-2px); box-shadow: 0 10px 28px rgba(47,123,255,.35); }
.btn-ghost { border: 1px solid rgba(255,255,255,.35); color: var(--text); }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); }

/* ---------- Stats ---------- */
.stats { background: var(--navy-800); border-block: 1px solid rgba(255,255,255,.07); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding: 34px 24px; }
.stat { text-align: center; }
.stat strong { display: block; font-size: 30px; font-weight: 500; color: var(--white); }
.stat span { font-size: 13px; color: var(--text-dim); }

/* ---------- Sections ---------- */
.section { padding: 90px 0; }
.section-alt { background: var(--navy-800); }
.section-title {
  font-size: 30px; font-weight: 500; color: var(--white); letter-spacing: 2px; margin-bottom: 20px;
  position: relative; padding-left: 18px;
}
.section-title::before {
  content: ""; position: absolute; left: 0; top: 8px; bottom: 8px; width: 4px;
  background: linear-gradient(180deg, var(--blue), var(--cyan)); border-radius: 2px;
}
.section-title.center { text-align: center; padding-left: 0; }
.section-title.center::before { display: none; }
.section-desc { color: var(--text-dim); max-width: 720px; margin-bottom: 44px; }
.section-desc.center { margin-inline: auto; text-align: center; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.about-text p { margin-bottom: 16px; color: var(--text-dim); font-size: 15.5px; }
.about-text strong { color: var(--white); font-weight: 500; }
.about-visual { display: grid; gap: 16px; }
.about-visual img { border-radius: var(--radius); border: 1px solid rgba(255,255,255,.1); }

/* ---------- Products ---------- */
.brand-line { margin: 8px 0 18px; display: flex; align-items: center; }
.brand-logo-inline { height: 32px; width: auto; margin-right: 14px; }
.brand-tag {
  display: inline-block; font-size: 14px; letter-spacing: 2px; color: var(--blue-light);
  border-left: 3px solid var(--blue); padding-left: 12px;
}
.brand-tag-green { color: #7dd8a8; border-left-color: #2e9e63; }
.product-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-bottom: 46px;
}
.product-card {
  background: var(--navy-700); border: 1px solid rgba(255,255,255,.08); border-radius: var(--radius);
  overflow: hidden; cursor: pointer; transition: transform .25s, border-color .25s, box-shadow .25s;
}
.product-card:hover { transform: translateY(-6px); border-color: rgba(77,163,255,.5); box-shadow: 0 16px 40px rgba(0,0,0,.45); }
.product-img { aspect-ratio: 4 / 3; overflow: hidden; background: #f4f5f7; }
.product-img.dark-bg { background: #000; }
.product-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.product-card:hover .product-img img { transform: scale(1.05); }
.product-card figcaption { padding: 16px 18px 18px; }
.product-card h3 { font-size: 16px; font-weight: 500; color: var(--white); }
.product-card figcaption p { font-size: 13px; color: var(--text-dim); margin-top: 4px; }

/* ---------- Expo ---------- */
.expo-video { max-width: 860px; margin: 0 auto 40px; }
.expo-video video {
  display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
  border-radius: var(--radius); border: 1px solid rgba(255,255,255,.12); background: #000;
}
.expo-video-cap { text-align: center; font-size: 13px; color: var(--text-dim); margin-top: 12px; }
.expo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }

/* ---------- OEM ---------- */
.oem-wrap { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.oem-text p { color: var(--text-dim); margin-bottom: 22px; }
.oem-text strong { color: var(--white); font-weight: 500; }
.oem-list { list-style: none; margin-bottom: 32px; }
.oem-list li {
  padding: 12px 0 12px 26px; border-bottom: 1px solid rgba(255,255,255,.08);
  color: var(--text-dim); font-size: 15px; position: relative;
}
.oem-list li::before {
  content: ""; position: absolute; left: 4px; top: 20px; width: 8px; height: 8px;
  background: var(--blue); border-radius: 50%;
}
.oem-list strong { color: var(--white); font-weight: 500; margin-right: 6px; }
.oem-visual { display: grid; grid-template-columns: 1fr 1.3fr; gap: 16px; align-items: center; }
.oem-visual img { border-radius: var(--radius); border: 1px solid rgba(255,255,255,.1); }

/* ---------- Honor ---------- */
.honor {
  padding: 80px 0; text-align: center;
  background:
    radial-gradient(ellipse at center, rgba(216, 180, 90, .12) 0%, rgba(216,180,90,0) 60%),
    var(--navy-900);
  border-block: 1px solid rgba(216,180,90,.25);
}
.honor-label { font-size: 13px; letter-spacing: 6px; color: var(--gold); margin-bottom: 16px; }
.honor-title { font-size: 32px; font-weight: 500; color: var(--gold); letter-spacing: 2px; margin-bottom: 14px; }
.honor-desc { color: var(--text-dim); font-size: 15px; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 10px; }
.contact-card {
  background: var(--navy-700); border: 1px solid rgba(255,255,255,.08); border-radius: var(--radius);
  padding: 32px 28px; text-align: center; transition: transform .25s, border-color .25s;
}
.contact-card:hover { transform: translateY(-4px); border-color: rgba(77,163,255,.5); }
.contact-card h3 {
  font-size: 14px; font-weight: 500; letter-spacing: 3px; color: var(--cyan); margin-bottom: 14px;
}
.contact-card p { color: var(--text-dim); font-size: 15px; }
.contact-card a { color: var(--white); border-bottom: 1px solid rgba(255,255,255,.3); transition: color .2s, border-color .2s; }
.contact-card a:hover { color: var(--cyan); border-color: var(--cyan); }

/* ---------- Footer ---------- */
.site-footer { padding: 34px 0; background: var(--navy-900); border-top: 1px solid rgba(255,255,255,.07); }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.footer-brands { display: flex; align-items: center; gap: 18px; }
.footer-logo { height: 26px; width: auto; opacity: .85; }
.footer-inner p { font-size: 13px; color: var(--text-dim); }
.footer-link { color: var(--text-dim); border-bottom: 1px solid rgba(255,255,255,.25); transition: color .2s; }
.footer-link:hover { color: var(--cyan); }

/* ---------- Policy page ---------- */
.policy-hero {
  padding: 140px 0 40px; text-align: center;
  background: linear-gradient(180deg, var(--navy-800) 0%, var(--navy-900) 100%);
  border-bottom: 1px solid rgba(255,255,255,.07);
}
.policy-hero h1 { font-size: 32px; font-weight: 500; color: var(--white); letter-spacing: 3px; margin-bottom: 10px; }
.policy-hero p { font-size: 13px; color: var(--text-dim); }
.policy-body { max-width: 860px; }
.policy-intro { color: var(--text); margin-bottom: 28px; }
.policy-body h2 {
  font-size: 20px; font-weight: 500; color: var(--white); letter-spacing: 1px;
  margin: 34px 0 14px; padding-left: 12px; border-left: 3px solid var(--blue);
}
.policy-body p { color: var(--text-dim); margin-bottom: 12px; font-size: 15px; }
.policy-body ul { list-style: none; margin-bottom: 16px; }
.policy-body li {
  color: var(--text-dim); font-size: 15px; padding: 8px 0 8px 22px; position: relative;
}
.policy-body li::before {
  content: ""; position: absolute; left: 4px; top: 17px; width: 7px; height: 7px;
  background: var(--blue); border-radius: 50%;
}
.policy-body li strong { color: var(--white); font-weight: 500; }
.policy-body a { color: var(--cyan); border-bottom: 1px solid rgba(56,189,248,.4); }

/* ---------- Lightbox ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 200; display: none;
  background: rgba(2, 8, 16, .92); align-items: center; justify-content: center; padding: 40px;
}
.lightbox.open { display: flex; }
.lightbox figure { max-width: min(1000px, 92vw); text-align: center; }
.lightbox img {
  max-height: 78vh; width: auto; max-width: 100%; margin-inline: auto;
  border-radius: 10px; border: 1px solid rgba(255,255,255,.15);
}
.lightbox figcaption { margin-top: 16px; color: var(--text-dim); font-size: 15px; }
.lightbox-close {
  position: absolute; top: 22px; right: 34px; font-size: 40px; line-height: 1;
  background: none; border: 0; color: var(--text-dim); cursor: pointer; transition: color .2s;
}
.lightbox-close:hover { color: var(--white); }

/* ---------- Responsive ---------- */
.mobile-only { display: none; }

@media (max-width: 960px) {
  .hero-inner, .about-grid, .oem-wrap { grid-template-columns: 1fr; gap: 36px; }
  .hero { padding: 120px 0 70px; }
  .hero h1 { font-size: 36px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); padding: 28px 24px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .expo-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .nav {
    position: fixed; top: 68px; right: 0; flex-direction: column; gap: 0;
    background: rgba(4,16,31,.97); width: 220px; padding: 12px 0;
    transform: translateX(100%); transition: transform .3s;
    border-left: 1px solid rgba(255,255,255,.08); border-bottom: 1px solid rgba(255,255,255,.08);
  }
  .nav.open { transform: translateX(0); }
  .nav a { padding: 13px 28px; }
  .nav-toggle { display: block; }
  .nav.nav-static {
    position: static; transform: none; flex-direction: row; width: auto;
    background: none; border: 0; padding: 0; gap: 18px;
  }
  .nav.nav-static a { padding: 6px 0; }
  .mobile-only { display: inline; }
}

@media (max-width: 560px) {
  .product-grid { grid-template-columns: 1fr; }
  .expo-grid { grid-template-columns: 1fr; }
  .hero-company { font-size: 30px; letter-spacing: 2px; }
  .en-title { font-size: 25px; letter-spacing: 0; }
  .hero h1 { font-size: 30px; }
  .honor-title { font-size: 24px; }
}