body {
  margin: 0;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f7fafd;
  color: #222;
}
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 18px;
}
.site-header {
  background: #23408e;
  color: #fff;
  box-shadow: 0 2px 8px #0001;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}
.logo {
  font-size: 1.7rem;
  font-weight: bold;
  letter-spacing: 0.08em;
}
nav {
  display: flex;
  gap: 22px;
}
nav a {
  color: #e2e8f0;
  text-decoration: none;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
}
nav a:hover, nav a:focus {
  background: #e2e8f0;
  color: #23408e;
}
.hero {
  background: linear-gradient(120deg, #e0eafc 0%, #cfdef3 100%);
  text-align: center;
  padding: 64px 0 40px 0;
}
.hero h1 {
  font-size: 2.7rem;
  font-weight: 700;
  color: #23408e;
  margin-bottom: 16px;
}
.hero p {
  font-size: 1.3rem;
  color: #3a506b;
  margin-bottom: 28px;
}
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  margin: 0 8px 8px 0;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 8px #0001;
  cursor: pointer;
}
.btn-primary {
  background: #23408e;
  color: #fff;
  border: none;
}
.btn-primary:hover, .btn-primary:focus {
  background: #3a506b;
}
.btn-secondary {
  background: #e2e8f0;
  color: #23408e;
  border: none;
}
.btn-secondary:hover, .btn-secondary:focus {
  background: #b5c6e0;
  color: #222;
}
main {
  margin-top: 32px;
}
section {
  margin-bottom: 40px;
}
.mission, .quick-contact {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px #0001;
  padding: 32px 24px;
  text-align: center;
}
.featured-projects {
  margin: 40px 0;
}
.featured-projects h2 {
  text-align: center;
}
.project-list {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}
.project-card {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 12px #0001;
  padding: 24px 18px;
  min-width: 220px;
  max-width: 320px;
  flex: 1 1 220px;
  text-align: left;
}
.social-icons {
  margin-top: 18px;
  display: flex;
  justify-content: center;
  gap: 18px;
}
.social-icons a {
  color: #23408e;
  font-size: 1.6rem;
  transition: color 0.2s;
}
.social-icons a:hover, .social-icons a:focus {
  color: #3a506b;
}
.site-footer {
  background: #23408e;
  color: #fff;
  text-align: center;
  padding: 32px 0 18px 0;
  margin-top: 48px;
}
@media (max-width: 900px) {
  .project-list { flex-direction: column; align-items: center; }
  .site-header .container { flex-direction: column; gap: 10px; }
}
@media (max-width: 600px) {
  .hero { padding: 32px 0 18px 0; }
  .hero h1 { font-size: 1.3rem; }
  .container { padding: 0 4px; }
  .mission, .quick-contact { padding: 14px 6px; }
  .project-card { min-width: 0; max-width: 100%; }
}