/* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background: linear-gradient(to right, #0f2027, #203a43, #2c5364);
  color: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 2rem 1rem;
  background: rgba(0,0,0,0.4);
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 1.2rem;
  color: #ccc;
}

main {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 2rem;
  flex: 1;
}

.card {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  padding: 2rem;
  width: 250px;
  text-align: center;
  transition: transform 0.3s, background 0.3s;
}

.card:hover {
  transform: translateY(-10px);
  background: rgba(255, 255, 255, 0.2);
}

.card h2 {
  margin-bottom: 1rem;
  font-size: 1.5rem;
  color: #00ffd5;
}

.card p {
  margin-bottom: 1.5rem;
  font-size: 1rem;
  color: #eee;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  background: #00ffd5;
  color: #000;
  text-decoration: none;
  border-radius: 10px;
  font-weight: bold;
  transition: background 0.3s, color 0.3s;
}

.btn:hover {
  background: #00bfa5;
  color: #fff;
}

footer {
  text-align: center;
  padding: 1rem;
  background: rgba(0,0,0,0.4);
  font-size: 0.9rem;
  color: #ccc;
}