body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #f5f7fa;
  color: #333;
}
.container {
  max-width: 1000px;
  margin: auto;
  padding: 0 20px;
}
.topbar {
  background: #e0e0e0;
  color: #333;
  font-size: 14px;
  padding: 10px 0;
  display: flex;
  justify-content: center;
  gap: 30px;
}
.navbar {
  background: #fff;
  border-bottom: 1px solid #ddd;
  padding: 15px 0;
}
.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.nav-links {
  list-style: none;
  display: flex;
  gap: 20px;
  padding: 0;
}
.nav-links li a {
  text-decoration: none;
  color: #2b4d86;
  font-weight: bold;
}
.nav-links li a:hover {
  text-decoration: underline;
}
.hero {
  background: url('cabecera-piston.jpg') no-repeat center center/cover;
  padding: 180px 20px; /* subimos el alto */
  color: white;
  position: relative;
}
.hero-content {
  background: rgba(0, 0, 0, 0.6); /* fondo más oscuro */
  padding: 40px 30px;
  border-radius: 10px;
  max-width: 700px;
  margin: auto;
  text-align: center;
}

.hero-content h1,
.hero-content p {
  color: #fff; /* texto blanco */
}

.cta {
  background: #2b4d86;
  color: #fff;
  padding: 12px 24px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  display: inline-block;
  margin-top: 20px;
}
h2 {
  text-align: center;
  color: #2b4d86;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 30px;
}
.card {
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 1px 8px rgba(0,0,0,0.05);
}
.porque .box {
  background: #e3ecf8;
  padding: 30px;
  border-radius: 10px;
  text-align: center;
}
.contacto ul {
  list-style: none;
  padding: 0;
}
footer {
  background: #2b4d86;
  color: white;
  text-align: center;
  padding: 20px;
  font-size: 14px;
}

footer a {
  color: white;
  text-decoration: underline;
}

footer a:hover {
  color: #ddd;
}