:root {
  --bg: #0d1b2a;
  --bg-alt: #f4f7fb;
  --ink: #14202e;
  --muted: #5a6b7b;
  --brand: #0a66c2;
  --brand-dark: #084d92;
  --accent: #f5a623;
  --white: #ffffff;
  --border: #e2e8f0;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(13, 27, 42, 0.08);
  --max: 1140px;
  --font: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--ink);
  line-height: 1.6;
  background: var(--white);
}

.container { width: 90%; max-width: var(--max); margin: 0 auto; }

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--brand);
  color: var(--white);
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  border: 2px solid var(--brand);
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}
.btn:hover { background: var(--brand-dark); border-color: var(--brand-dark); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--white); border-color: rgba(255, 255, 255, 0.7); }
.btn-outline:hover { background: rgba(255, 255, 255, 0.12); border-color: var(--white); }
.btn-sm { padding: 0.55rem 1.1rem; font-size: 0.9rem; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 0.9rem 0; }
.brand { display: flex; align-items: center; gap: 0.6rem; font-size: 1.25rem; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: var(--white); font-weight: 800;
  display: grid; place-items: center;
}
.brand-text strong { color: var(--brand); font-weight: 800; }
.nav { display: flex; align-items: center; gap: 1.6rem; }
.nav a { font-weight: 500; color: var(--ink); transition: color 0.2s; }
.nav a:hover { color: var(--brand); }
.nav .btn { color: var(--white); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; }
.nav-toggle span { width: 26px; height: 3px; background: var(--ink); border-radius: 2px; }

/* Hero */
.hero {
  background: radial-gradient(1200px 500px at 70% -10%, #1b4b7d 0%, var(--bg) 55%);
  color: var(--white);
  padding: 5.5rem 0 4rem;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.8rem;
}
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.15; margin-bottom: 1.2rem; }
.hero h1 span { color: var(--accent); }
.hero-sub { max-width: 620px; color: rgba(255, 255, 255, 0.82); font-size: 1.08rem; margin-bottom: 2rem; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 2.5rem; margin-top: 3rem; flex-wrap: wrap; }
.hero-stats strong { display: block; font-size: 1.6rem; color: var(--white); }
.hero-stats span { color: rgba(255, 255, 255, 0.7); font-size: 0.9rem; }

/* Sections */
.section { padding: 4.5rem 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 2.8rem; }
.section-head h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); margin-bottom: 0.6rem; }
.section-sub { color: var(--muted); }
.eyebrow { color: var(--brand); }
.section .eyebrow { color: var(--brand); }

/* Grid */
.grid { display: grid; gap: 1.4rem; }
.products-grid { grid-template-columns: repeat(4, 1fr); }
.features-grid { grid-template-columns: repeat(4, 1fr); }

/* Product card */
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow);
  transition: transform 0.25s, box-shadow 0.25s;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(13, 27, 42, 0.14); }
.card .icon {
  width: 52px; height: 52px; border-radius: 12px;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  display: grid; place-items: center; font-size: 1.5rem; margin-bottom: 1rem;
}
.card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.card p { color: var(--muted); font-size: 0.95rem; }

/* About */
.about-inner { display: grid; grid-template-columns: 1.4fr 1fr; gap: 3rem; align-items: center; }
.about-text p { color: var(--muted); margin-bottom: 1.4rem; }
.checklist { list-style: none; margin-bottom: 1.6rem; }
.checklist li { position: relative; padding-left: 1.8rem; margin-bottom: 0.7rem; }
.checklist li::before {
  content: "\2714"; position: absolute; left: 0; top: 0;
  color: var(--brand); font-weight: 700;
}
.about-card {
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: var(--white); padding: 2rem; border-radius: var(--radius); box-shadow: var(--shadow);
}
.about-card h3 { margin-bottom: 0.8rem; font-size: 1.3rem; }
.about-card p { color: rgba(255, 255, 255, 0.88); }

/* Contact */
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.contact-list { list-style: none; margin-top: 1.5rem; }
.contact-list li { margin-bottom: 1.2rem; }
.contact-list span { display: block; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.contact-list a { font-weight: 600; color: var(--brand); }
.contact-form { background: var(--white); padding: 2rem; border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--border); }
.field { margin-bottom: 1.1rem; }
.field label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 0.4rem; }
.field input, .field select, .field textarea {
  width: 100%; padding: 0.7rem 0.9rem; border: 1px solid var(--border);
  border-radius: 10px; font: inherit; background: #fbfcfe;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid var(--brand); border-color: var(--brand); }
.form-note { margin-top: 1rem; color: #1a7f4b; font-weight: 600; }

/* Footer */
.site-footer { background: var(--bg); color: rgba(255, 255, 255, 0.75); padding: 2.5rem 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.site-footer .brand-text { color: var(--white); }

/* Products page */
.page-hero {
  background: radial-gradient(900px 400px at 75% -20%, #1b4b7d 0%, var(--bg) 60%);
  color: var(--white);
  padding: 4rem 0 3.5rem;
}
.page-hero h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); margin-bottom: 1rem; }
.page-hero .eyebrow { color: var(--accent); }
.page-hero-sub { max-width: 640px; color: rgba(255, 255, 255, 0.82); }

.product-list { display: flex; flex-direction: column; gap: 2rem; }
.product-row {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 2.5rem;
  align-items: center;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}
.product-row.reverse { grid-template-columns: 1fr 300px; }
.product-row.reverse .product-visual { order: 2; }
.product-visual {
  height: 200px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--brand), var(--accent));
  display: grid; place-items: center;
}
.product-visual span { font-size: 4.5rem; }
.product-detail h2 { font-size: 1.5rem; margin-bottom: 0.6rem; }
.product-detail p { color: var(--muted); margin-bottom: 1.2rem; }
.spec-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem 1.5rem;
  margin-bottom: 1.4rem;
}
.spec-list li { font-weight: 600; font-size: 0.95rem; }
.spec-list span {
  display: block; font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--muted); font-weight: 700;
}

.cta-band { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; }
.cta-band h2 { font-size: clamp(1.4rem, 3vw, 2rem); }

/* Responsive */
@media (max-width: 960px) {
  .products-grid, .features-grid { grid-template-columns: repeat(2, 1fr); }
  .about-inner, .contact-inner { grid-template-columns: 1fr; }
  .product-row, .product-row.reverse { grid-template-columns: 1fr; gap: 1.5rem; }
  .product-row.reverse .product-visual { order: 0; }
  .product-visual { height: 160px; }
}
@media (max-width: 640px) {
  .nav {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--white); flex-direction: column; align-items: stretch;
    padding: 1rem 5%; gap: 0.4rem; border-bottom: 1px solid var(--border);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 0.6rem 0; }
  .nav-toggle { display: flex; }
  .products-grid, .features-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.5rem; }
}