.mitmachen-box {
  background: rgba(255, 255, 255, 0.9);
  max-width: 700px;
  margin: 120px auto;
  padding: 40px;
  border-radius: 15px;
  color: #333;
}

.mitmachen-box h1 { color: var(--brand-green); margin-top: 0; }

.benefit-list {
  list-style: none;
  padding: 0;
  margin: 20px 0 30px;
}

.benefit-list li {
  margin-bottom: 10px;
  padding-left: 5px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.full { grid-column: span 2; }

input[type="text"], input[type="email"] {
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 1rem;
}

.legal-check {
  margin: 20px 0;
  font-size: 0.9rem;
  line-height: 1.4;
}

.legal-check input[type="checkbox"] {
  transform: translateY(1px);
  margin-right: 8px;
}

.submit-btn {
  width: 100%;
  padding: 15px;
  background: var(--brand-green);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  font-size: 1.1rem;
  cursor: pointer;
}

.doi-note {
  text-align: center;
  margin-top: 15px;
  color: #666;
}

@media (max-width: 640px) {
  .mitmachen-box {
    margin: 110px 12px 90px;
    padding: 24px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .full {
    grid-column: auto;
  }
}