:root {
  --primary-color: #004a99;
  --secondary-color: #0066cc;
  --text-color: #333;
  --background-color: #fff;
  --max-width: 1200px;
  --transition: all .3s ease-in-out;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-color);
  background: var(--background-color);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  padding: 0 1rem;
  margin: 0 auto;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}

a:hover,
a:focus {
  text-decoration: underline;
}

.site-header {
  background: var(--background-color);
  border-bottom: 1px solid #e2e8f0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.flex {
  display: flex;
}

.logo {
  height: 80px;
  width: auto;
}

.nav {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 1rem;
}

.nav li {
  margin: 0;
}

.nav a {
  display: block;
  padding: 0.75rem 0;
  font-weight: 600;
}

.btn {
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-weight: 600;
  white-space: nowrap;
}

.btn.primary {
  background: var(--primary-color);
  color: #fff;
}

.btn.primary:hover,
.btn.primary:focus {
  background: var(--secondary-color);
}

.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  background: var(--primary-color);
  height: 2px;
  width: 25px;
  border-radius: 2px;
  position: relative;
  transition: var(--transition);
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
  content: "";
  position: absolute;
}

.nav-toggle-label span::before {
  top: -8px;
}

.nav-toggle-label span::after {
  top: 8px;
}

@media (max-width: 768px) {
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--background-color);
    flex-direction: column;
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease;
  }
  .nav-toggle:checked + .nav-toggle-label span {
    background: transparent;
  }
  .nav-toggle:checked + .nav-toggle-label span::before {
    transform: rotate(45deg);
    top: 0;
  }
  .nav-toggle:checked + .nav-toggle-label span::after {
    transform: rotate(-45deg);
    top: 0;
  }
  .nav-toggle:checked ~ .nav {
    max-height: 400px;
  }
  .nav li {
    text-align: center;
  }
  .nav a {
    padding: 1rem 0;
  }
  .nav-toggle-label {
    display: block;
  }
}

.hero {
  background-color: #f0f0f0;
  color: #111;
  text-align: center;
  padding: 4rem 1rem;

}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

.section {
  padding: 2rem 0;
}

.section h2 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 2rem;
  color: var(--primary-color);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 1.5rem;
  background: #fff;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px rgba(0,0,0,.05);
}

.card h3 {
  margin-top: 0;
  color: var(--primary-color);
}

.site-footer {
  background: #f7fafc;
  padding: 2rem 0;
  margin-top: 2rem;
  text-align: center;
  font-size: .875rem;
}

.footer-inner p {
  margin: 0;
}

img.responsive {
  max-width: 100%;
  height: auto;
}