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

body {
  font-family: Arial, sans-serif;
  color: #0b2545;
  background: #ffffff;
}

header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255,255,255,0.95);
  padding: 14px 8%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 15px rgba(0,0,0,0.08);
  z-index: 10;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: bold;
  font-size: 20px;
}

.logo img {
  height: 55px;
}

nav a {
  margin-left: 25px;
  text-decoration: none;
  color: #0b2545;
  font-weight: 600;
}

.hero {
  min-height: 90vh;
  padding: 140px 8% 80px;
  display: flex;
  align-items: center;
  background:
    linear-gradient(rgba(8,35,65,.55), rgba(8,35,65,.55)),
    url("../images/hero.jpg") center center/cover no-repeat;
  color: white;
}

.hero-content {
  max-width: 760px;
}

.hero h1 {
  font-size: 58px;
  line-height: 1.1;
  margin-bottom: 25px;
}

.hero p {
  font-size: 22px;
  line-height: 1.6;
  margin-bottom: 35px;
}

.btn {
  display: inline-block;
  padding: 15px 28px;
  border-radius: 40px;
  background: #2f7d32;
  color: white;
  text-decoration: none;
  font-weight: bold;
  margin-right: 12px;
}

.btn.secondary {
  background: #0b2545;
}

section {
  padding: 80px 8%;
}

.section-title {
  font-size: 38px;
  margin-bottom: 35px;
  text-align: center;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 25px;
}

.card {
  padding: 30px;
  border-radius: 20px;
  background: #ffffff;
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

.card h3 {
  margin-bottom: 12px;
  font-size: 24px;
}

.about {
  background: #0b2545;
  color: white;
}

.about .card {
  color: #0b2545;
}

.contact {
  background: #f5fbf7;
  text-align: center;
}

footer {
  padding: 25px;
  text-align: center;
  background: #0b2545;
  color: white;
}

.whatsapp {
  position: fixed;
  right: 25px;
  bottom: 25px;
  width: 65px;
  height: 65px;
  background: #25D366;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  text-decoration: none;
  box-shadow: 0 10px 25px rgba(0,0,0,.25);
  transition: all .3s ease;
  z-index: 9999;
}

.whatsapp:hover {
  transform: scale(1.12);
  background: #20ba5a;
}

@media (max-width: 768px) {
  nav {
    display: none;
  }

  .hero h1 {
    font-size: 38px;
  }

  .hero p {
    font-size: 18px;
  }

  .logo span {
    font-size: 16px;
  }
}