:root {
  --navy: #0f2540;
  --navy-dark: #0a1b30;
  --accent: #2f8fff;
  --text: #1c2530;
  --muted: #5b6b7c;
  --bg-alt: #f4f7fa;
  --white: #ffffff;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

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

/* Header */
.site-header {
  background: var(--navy);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--white);
}

.logo span {
  font-weight: 400;
  opacity: 0.75;
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

nav {
  display: flex;
  gap: 28px;
}

nav a {
  color: var(--white);
  font-weight: 500;
  opacity: 0.9;
  transition: opacity 0.2s;
}

nav a:hover { opacity: 1; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: var(--white);
  padding: 110px 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.hero p {
  max-width: 560px;
  margin: 0 auto 32px;
  color: rgba(255,255,255,0.85);
  font-size: 1.1rem;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: 14px 32px;
  border-radius: 6px;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.btn:hover {
  background: #1c7ce8;
  transform: translateY(-1px);
}

/* Sections */
.section {
  padding: 80px 0;
}

.section.alt {
  background: var(--bg-alt);
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 20px;
}

.section p {
  color: var(--muted);
  max-width: 700px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.card {
  background: var(--white);
  padding: 28px;
  border-radius: 10px;
  box-shadow: 0 4px 16px rgba(15, 37, 64, 0.08);
}

.card h3 {
  margin-bottom: 10px;
  color: var(--navy);
}

.card p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 24px 0;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 720px) {
  .nav-toggle { display: block; }

  nav {
    display: none;
    flex-direction: column;
    gap: 0;
    background: var(--navy);
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 12px 24px 20px;
  }

  nav.open { display: flex; }

  nav a { padding: 10px 0; }

  .hero h1 { font-size: 2rem; }
}