:root {
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --accent-hover: #c0392b;
  --text-color: #ffffff;
  --bg-light: #f8f9fa;
  --white: #fff;

  --form-border: #ccc;
  --form-focus: var(--primary-color);
  --text-light: var(--text-color);

  --success-bg: #d4edda;
  --success-text: #155724;
  --success-border: #c3e6cb;
  --error-bg: #f8d7da;
  --error-text: #721c24;
  --error-border: #f5c6cb;
}



/* Contenitore del form */
.form-container {
  max-width: 700px;
  margin: 0 auto 5rem auto;
  padding: 2.5rem;
  border-radius: 16px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
  background-image: linear-gradient(to bottom right, var(--primary-color), var(--secondary-color));
  color: var(--white);
}

/* Gruppi input */
.form-group {
  margin-bottom: 1.75rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.6rem;
  font-weight: 600;
  color: var(--white);
  font-size: 1rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-size: 1rem;
  border: 1.5px solid var(--form-border);
  border-radius: 8px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  background-color: var(--white);
  color: #2c3e50;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.15);
}

textarea {
  resize: vertical;
}

/* Pulsante invio */
.btn-submit {
  background-color: var(--accent-color);
  color: var(--white);
  padding: 0.85rem 2rem;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1.1rem;
  cursor: pointer;
  display: inline-block;
  transition: background-color 0.3s ease, transform 0.2s ease;
  box-shadow: 0 6px 14px rgba(231, 76, 60, 0.3);
}

.btn-submit:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

/* Messaggi di feedback */
.alert {
  padding: 1.1rem 1.25rem;
  margin-bottom: 1.8rem;
  border-radius: 6px;
  font-size: 1rem;
}

.alert-success {
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}

.alert-danger {
  background: var(--error-bg);
  color: var(--error-text);
  border: 1px solid var(--error-border);
}

/* Responsive */
@media (max-width: 768px) {
  .form-container {
    padding: 2rem 1.2rem;
    margin: 0 1rem 4rem 1rem;
  }

  .section-title {
    font-size: 2rem;
    margin-top: 3rem;
    margin-bottom: 2rem;
  }

  .btn-submit {
    width: 100%;
  }
}