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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: #0f2a44;
  line-height: 1.6;
  background: #ffffff;
}

header {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid #eee;
  padding: 16px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #0f2a44;
  font-weight: 500;
}

.btn {
  background: #1ba6a6;
  color: #fff;
  padding: 10px 18px;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
}

section {
  padding: 80px 40px;
  max-width: 1100px;
  margin: auto;
}

h1, h2, h3 {
  margin-bottom: 20px;
}

p {
  margin-bottom: 16px;
  max-width: 720px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 30px;
}

.card {
  border: 1px solid #eee;
  padding: 24px;
  border-radius: 6px;
}

footer {
  border-top: 1px solid #eee;
  padding: 30px 40px;
  font-size: 14px;
  color: #555;
  text-align: center;
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }
  nav {
    margin-top: 10px;
  }
}


details {
  border: 1px solid #eee;
  border-radius: 6px;
  padding: 18px 22px;
  margin-bottom: 16px;
  background: #fff;
}

summary {
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  float: right;
  font-weight: 700;
}

details[open] summary::after {
  content: "–";
}

details ul {
  margin-top: 15px;
  margin-left: 20px;
  line-height: 1.8;
}


.hero {
  background: url("assets/hero.jpg") center / cover no-repeat;
  min-height: 420px;
  display: flex;
  align-items: center;
}

.hero-content {
  background: rgba(255, 255, 255, 0.92);
  padding: 40px;
  max-width: 700px;
  margin-left: 40px;
  border-radius: 6px;
}