body {
  margin: 0;
  font-family: 'Montserrat', sans-serif;
  color: #333;
  background-color: #fafafa;
}
header {
  background-color: #ffffff;
  padding: 1.5rem 2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 {
  margin: 0;
  font-size: 1.8rem;
}
nav a {
  margin-left: 2rem;
  text-decoration: none;
  color: #333;
  font-weight: 600;
}
.hero {
  height: 90vh;
  background-image: url('https://source.unsplash.com/1600x900/?interior,design');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
}
.hero h2 {
  font-size: 3rem;
  background-color: rgba(0,0,0,0.5);
  padding: 1rem 2rem;
  border-radius: 10px;
}
section {
  padding: 4rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}
section h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  text-align: center;
}
.servicios, .proyectos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}
.card {
  background-color: white;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  border-radius: 10px;
}
.card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 8px;
}
footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 2rem 1rem;
}
footer a {
  color: #ffffff;
  text-decoration: underline;
}
.whatsapp-button {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #25D366;
  color: white;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
  font-size: 30px;
  z-index: 1000;
  text-decoration: none;
}