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

body {
  background: #0f172a;
  color: #fff;
  line-height: 1.6;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
}

.header {
  background: #111827;
  padding: 15px 0;
  position: sticky;
  top: 0;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header a {
  color: #fff;
  margin-left: 15px;
  text-decoration: none;
  font-size: 14px;
}

.hero {
  height: 90vh;
  display: flex;
  align-items: center;
  text-align: center;
  background: linear-gradient(135deg, #1e293b, #0f172a);
}

.hero-content h2 {
  font-size: 40px;
  margin-bottom: 15px;
}

.hero button {
  padding: 10px 20px;
  background: #3b82f6;
  border: none;
  color: white;
  cursor: pointer;
  margin-top: 15px;
  transition: 0.3s;
}

.hero button:hover {
  background: #2563eb;
}

.section {
  padding: 60px 0;
}

.section.alt {
  background: #1e293b;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.card {
  background: #111827;
  padding: 20px;
  border-radius: 8px;
  transition: 0.3s;
}

.card:hover {
  transform: translateY(-5px);
}

form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

input, textarea {
  padding: 10px;
  border: none;
  border-radius: 4px;
}

button[type="submit"] {
  background: #22c55e;
  color: white;
  border: none;
  padding: 10px;
  cursor: pointer;
}

.footer {
  background: #111827;
  text-align: center;
  padding: 20px 0;
  font-size: 14px;
}

.mensaje {
  margin-top: 15px;
  color: #22c55e;
}