:root {
  --blue-900: #0a3d7c;
  --blue-700: #0b5cb8;
  --blue-600: #1668c9;
  --blue-500: #2483ea;
  --blue-50: #eef5fd;
  --ink: #1c2b3a;
  --muted: #5b6b7c;
  --line: #e3ebf4;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(11, 92, 184, 0.10);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Malgun Gothic", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
}

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

.container { width: min(1160px, 92%); margin: 0 auto; }

/* ---------- Top bar ---------- */
.topbar {
  background: var(--blue-900);
  color: #cfe2f7;
  font-size: 13px;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 0;
  gap: 12px;
  flex-wrap: wrap;
}
.topbar a { color: #ffffff; }
.topbar .langs { display: flex; gap: 14px; }
.topbar .langs a.active { font-weight: 700; text-decoration: underline; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 16px;
  flex-wrap: wrap;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-900));
  display: grid;
  place-items: center;
  flex: none;
}
.logo-mark svg { width: 24px; height: 24px; }
.logo-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
}
.logo-text { font-weight: 800; font-size: 19px; color: var(--blue-900); line-height: 1.15; }
.logo-text small { display: block; font-size: 11px; font-weight: 500; color: var(--muted); letter-spacing: 2px; }

.nav-menu { display: flex; gap: 26px; font-weight: 600; }
.nav-menu a { padding: 6px 2px; color: var(--ink); transition: color 0.2s; }
.nav-menu a:hover { color: var(--blue-600); }

.btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.15s, box-shadow 0.15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-500));
  color: #fff;
  box-shadow: 0 8px 20px rgba(22, 104, 201, 0.35);
}
.btn-outline { border: 2px solid #fff; color: #fff; }
.btn-ghost { border: 2px solid var(--blue-600); color: var(--blue-600); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  color: #fff;
  overflow: hidden;
}
.hero img.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(7, 42, 92, 0.88) 15%, rgba(10, 61, 124, 0.55) 55%, rgba(10, 61, 124, 0.25));
}
.hero .container {
  position: relative;
  z-index: 1;
  padding: 110px 0 120px;
}
.hero h1 { font-size: clamp(30px, 4.5vw, 52px); line-height: 1.2; max-width: 700px; }
.hero p.sub { margin: 18px 0 30px; font-size: 18px; max-width: 620px; color: #dbe9fa; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Stats ---------- */
.stats { background: var(--blue-700); color: #fff; }
.stats .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 26px 0;
  text-align: center;
}
.stats b { display: block; font-size: 28px; }
.stats span { font-size: 13px; color: #cfe2f7; }

/* ---------- Sections ---------- */
section.block { padding: 76px 0; }
section.block.alt { background: var(--blue-50); }

.sec-head { text-align: center; max-width: 640px; margin: 0 auto 44px; }
.sec-head .kicker {
  display: inline-block;
  color: var(--blue-600);
  font-weight: 800;
  letter-spacing: 3px;
  font-size: 13px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.sec-head h2 { font-size: clamp(24px, 3vw, 34px); color: var(--blue-900); }
.sec-head p { color: var(--muted); margin-top: 10px; }

/* ---------- Products ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
  display: flex;
  flex-direction: column;
}
.card:hover { transform: translateY(-5px); }
.card .thumb { aspect-ratio: 4 / 3; overflow: hidden; }
.card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.35s; }
.card:hover .thumb img { transform: scale(1.05); }
.card .body { padding: 18px 18px 22px; }
.card h3 { font-size: 17px; color: var(--blue-900); margin-bottom: 6px; }
.card p { font-size: 14px; color: var(--muted); }
.card .tag {
  display: inline-block;
  margin-top: 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--blue-600);
  background: var(--blue-50);
  border-radius: 999px;
  padding: 4px 12px;
}

/* ---------- Features ---------- */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
}
.feature .icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--blue-50);
  display: grid;
  place-items: center;
  margin-bottom: 14px;
}
.feature .icon svg { width: 24px; height: 24px; }
.feature h3 { font-size: 17px; color: var(--blue-900); margin-bottom: 8px; }
.feature p { font-size: 14px; color: var(--muted); }

/* ---------- About ---------- */
.about { display: grid; grid-template-columns: 1.05fr 1fr; gap: 44px; align-items: center; }
.about img { border-radius: var(--radius); box-shadow: var(--shadow); }
.about h2 { font-size: clamp(24px, 3vw, 32px); color: var(--blue-900); margin-bottom: 16px; }
.about p { color: var(--muted); margin-bottom: 14px; }
.about ul.checks { margin-top: 8px; }
.about ul.checks li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 9px;
  font-weight: 600;
  font-size: 15px;
}
.about ul.checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--blue-600);
}
.about ul.checks li::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  width: 8px;
  height: 4px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg);
}

/* ---------- CTA ---------- */
.cta {
  background: linear-gradient(120deg, var(--blue-900), var(--blue-600));
  color: #fff;
  text-align: center;
  padding: 64px 0;
}
.cta h2 { font-size: clamp(24px, 3vw, 32px); }
.cta p { color: #cfe2f7; margin: 12px auto 26px; max-width: 560px; }

/* ---------- Contact ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; }
.contact-info h3 { color: var(--blue-900); font-size: 20px; margin-bottom: 14px; }
.contact-info p { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.contact-info .row { display: flex; gap: 12px; margin-bottom: 14px; font-size: 15px; }
.contact-info .row b { color: var(--blue-900); min-width: 92px; }

.form { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.form h3 { color: var(--blue-900); font-size: 20px; margin-bottom: 16px; }
.form .two { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form label { display: block; font-size: 13px; font-weight: 700; color: var(--ink); margin: 12px 0 6px; }
.form input, .form textarea, .form select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  font-size: 14px;
  font-family: inherit;
  background: #fbfdff;
}
.form input:focus, .form textarea:focus, .form select:focus {
  outline: 2px solid var(--blue-500);
  border-color: var(--blue-500);
}
.form button { margin-top: 18px; width: 100%; border: none; cursor: pointer; font-size: 15px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--blue-900); color: #b9d2ec; padding: 46px 0 0; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; padding-bottom: 34px; }
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.site-footer a:hover { color: #fff; }
.site-footer li { margin-bottom: 8px; }
.copyright { border-top: 1px solid rgba(255, 255, 255, 0.12); text-align: center; padding: 16px 0; font-size: 13px; color: #8fb4d9; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .about, .contact-wrap { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .grid-4, .grid-3, .form .two, .footer-grid { grid-template-columns: 1fr; }
  .stats .container { grid-template-columns: repeat(2, 1fr); }
  .nav-menu { display: none; }
}