* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Helvetica Neue', sans-serif;
}

.header {
  position: sticky;
  top: 0;
  background-color: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  z-index: 1000;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  letter-spacing: 2px;
  color: #000000;
}

.nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #333333;
  font-size: 16px;
  transition: color 0.3s;
}

.nav a:hover {
  color: #000000;
}

.hero {
  position: relative;
  height: 90vh;
  background-color: black;
  overflow: hidden;
}

.hero-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

.section {
  padding: 80px 20px;
  max-width: 1100px;
  margin: auto;
}

.section h3 {
  font-size: 32px;
  margin-bottom: 20px;
  text-align: center;
}

.section p {
  font-size: 18px;
  line-height: 1.7;
  color: #555555;
  margin-bottom: 20px;
}

.section img,
.section video {
  max-width: 100%;
  border-radius: 12px;
  margin-top: 20px;
}

.estrategia-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin-top: 40px;
}

.estrategia-grid div {
  flex: 1;
  min-width: 280px;
}

.footer {
  background-color: #f7f7f7;
  text-align: center;
  padding: 40px 20px;
  margin-top: 60px;
}

.footer h4 {
  font-size: 24px;
  margin-bottom: 10px;
}

.footer p a {
  color: #000000;
  text-decoration: none;
  font-size: 18px;
}

.footer p a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .nav a {
    margin-left: 10px;
    font-size: 14px;
  }
  .hero h2 {
    font-size: 28px;
  }
  .hero p {
    font-size: 16px;
  }
  .section h3 {
    font-size: 28px;
  }
  .section p {
    font-size: 16px;
  }
}