:root {
  --primary-green: #198754;
  --light-green: #d1e7dd;
  --dark-green: #146c43;
  --hover-green: #157347;
}

body {
  background: linear-gradient(120deg, #FFE5B0, #ffecd2);
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.message-card {
  border: none;
  border-radius: 12px;
  transition: all 0.3s ease;
  background: white;
  border-left: 4px solid var(--primary-green);
}

.message-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(25, 135, 84, 0.15) !important;
}

.github-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 3px solid var(--primary-green);
  object-fit: cover;
}

.avatar-placeholder {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--light-green);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-green);
}

.card-title {
  font-size: 1.1rem;
}

.card-text {
  color: #495057;
  line-height: 1.6;
  font-size: 0.95rem;
}

.message-footer {
  padding-top: 0.75rem;
  border-top: 1px solid #e9ecef;
}

header h1 {
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.spinner-border {
  width: 3rem;
  height: 3rem;
}

/* Animação de entrada */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.col-md-6 {
  animation: fadeInUp 0.5s ease-out;
}

/* Responsividade */
@media (max-width: 768px) {
  header h1 {
    font-size: 2rem;
  }

  .github-avatar,
  .avatar-placeholder {
    width: 40px;
    height: 40px;
  }
}