:root {
  --primary: #0ea5a4;
  --primary-hover: #0c8e8d;
  --text-color: #1f2937;
  --radius: 0.75rem;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Source Sans 3", Arial, sans-serif;
}

body {
  background: linear-gradient(180deg, #f9fafb 0%, #e5e7eb 100%);
  color: var(--text-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 2.5rem 1rem 1rem;
}

.avatar {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  border: 3px solid var(--primary);
  margin-bottom: 1rem;
}

header h1 {
  font-size: 1.8rem;
  margin-bottom: 0.25rem;
}

header p {
  font-size: 1rem;
  color: #4b5563;
}

main {
  flex: 1;
  padding: 1rem;
  max-width: 700px;
  margin: 0 auto;
}

section {
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  text-align: center;
  color: #111827;
}

h2 i {
  margin-right: 0.5rem;
  color: var(--primary);
}

.button-group {
  display: grid;
  gap: 0.75rem;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background-color: var(--primary);
  color: #fff;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: background 0.3s, transform 0.1s, box-shadow 0.3s;
}

.btn i {
  font-size: 1.1rem;
}

.btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(14, 165, 164, 0.25);
}

footer {
  text-align: center;
  padding: 1.2rem;
  font-size: 0.85rem;
  color: #6b7280;
  border-top: 1px solid #d1d5db;
}

/* --- Responsivo --- */
@media (min-width: 640px) {
  header h1 {
    font-size: 2rem;
  }

  .button-group {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  }

  .btn {
    font-size: 1rem;
  }
}