:root {
  --navy: #0B1F3A;
  --blue: #0088CC;
  --blue2: #00A6E0;
  --silver: #C0C0C0;
  --light: #F4F7FB;
  --dark: #1A2A44;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #222;
  line-height: 1.6;
  background: #fff;
}
a { text-decoration: none; color: inherit; }

/* ===== NAV ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(11,31,58,0.96);
  backdrop-filter: blur(6px);
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; }
.brand img { height: 40px; width: auto; }
.brand span { font-size: 17px; letter-spacing: .5px; }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: #cdd9ea; font-size: 15px; transition: color .2s;
}
.nav-links a:hover { color: #fff; }
.lang-switch {
  background: var(--blue); color: #fff; border: none;
  padding: 7px 14px; border-radius: 20px; cursor: pointer;
  font-size: 14px; transition: background .2s;
}
.lang-switch:hover { background: var(--blue2); }

/* ===== HERO ===== */
.hero {
  background: linear-gradient(135deg, #0B1F3A 0%, #123a63 55%, #0088CC 100%);
  color: #fff; text-align: center;
  padding: 90px 24px 80px;
}
.hero-logo { height: 130px; width: auto; margin-bottom: 24px; filter: drop-shadow(0 4px 12px rgba(0,0,0,0.3)); }
.hero h1 { font-size: 42px; font-weight: 800; margin-bottom: 14px; letter-spacing: 1px; }
.hero-sub { font-size: 16px; color: #cfe4f7; margin-bottom: 30px; }
.btn {
  display: inline-block;
  background: #fff; color: var(--navy);
  padding: 13px 34px; border-radius: 30px; font-weight: 700; font-size: 16px;
  transition: transform .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.25); }

/* ===== FEATURES ===== */
.features {
  max-width: 1100px; margin: 60px auto; padding: 0 24px;
  display: grid; grid-template-columns: repeat(3,1fr); gap: 30px;
}
.feat {
  text-align: center; padding: 34px 24px;
  background: var(--light); border-radius: 16px;
  transition: transform .2s, box-shadow .2s;
}
.feat:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(0,136,204,0.15); }
.feat-icon { font-size: 44px; margin-bottom: 12px; }
.feat h3 { color: var(--navy); font-size: 20px; margin-bottom: 8px; }

/* ===== PRODUCTS ===== */
.products { max-width: 1200px; margin: 0 auto 60px; padding: 0 24px; }
.products h2 {
  text-align: center; font-size: 32px; color: var(--navy);
  margin-bottom: 40px; position: relative;
}
.products h2::after {
  content: ""; display: block; width: 60px; height: 4px;
  background: var(--blue); margin: 12px auto 0; border-radius: 2px;
}
.series { margin-bottom: 44px; }
.series-title {
  font-size: 22px; color: var(--navy); margin-bottom: 20px;
  padding-left: 14px; border-left: 5px solid var(--blue);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 22px;
}
.card {
  background: #fff; border-radius: 14px; overflow: hidden;
  border: 1px solid #e8eef5; transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(11,31,58,0.12); }
.card img { width: 100%; height: 200px; object-fit: contain; background: #fafbfd; display: block; }
.placeholder {
  width: 100%; height: 200px; background: #eef2f7;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  color: #9aa7b8; gap: 6px;
}
.placeholder span { font-size: 20px; font-weight: 700; color: #7a8899; }
.placeholder small { font-size: 13px; }
.card-body { padding: 14px 16px; display: flex; align-items: center; justify-content: space-between; }
.card-body h4 { font-size: 17px; color: var(--navy); }
.tag {
  background: #e8f5fc; color: var(--blue); font-size: 12px;
  padding: 3px 10px; border-radius: 12px; font-weight: 600;
}

/* ===== ABOUT / CONTACT ===== */
.about, .contact { max-width: 900px; margin: 0 auto 60px; padding: 0 24px; text-align: center; }
.about h2, .contact h2 {
  font-size: 28px; color: var(--navy); margin-bottom: 20px;
}
.about p { font-size: 16px; color: #444; line-height: 1.9; }
.contact-info { display: inline-block; text-align: left; font-size: 16px; line-height: 2.1; }
.contact-info a { color: var(--blue); }

.footer { background: var(--navy); color: #9fb4ce; text-align: center; padding: 26px; font-size: 14px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 28px; }
  .hero-logo { height: 90px; }
  .features { grid-template-columns: 1fr; }
  .brand span { display: none; }
}