body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    background: #eef7fa;
    color: #003f5c;
  }

  header {
    background: #0078aa;
    color: white;
    padding: 2rem;
    text-align: center;
  }

  .container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 1rem;
  }

  .section-title {
    text-align: center;
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
  }

  .controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
  }

  .controls input {
    padding: 0.5rem;
    border-radius: 5px;
    border: 1px solid #aaa;
    width: 250px;
  }

  .controls button {
    padding: 0.5rem 1rem;
    background: #0078aa;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }

  .controls button:hover {
    background: #005f88;
  }

  .flow-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
  }

  .box {
    background: white;
    border-left: 5px solid #0078aa;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
    cursor: pointer;
  }

  .box:hover {
    transform: scale(1.03);
  }

  .box h3 {
    margin-top: 0;
    color: #004e92;
    font-size: 1.2rem;
  }

  .box ul {
    margin: 0.5rem 0 0;
    padding-left: 1.2rem;
    display: none;
  }

  .box.active ul {
    display: block;
  }

  .label {
    font-style: italic;
    font-size: 0.9rem;
    color: #555;
    margin-top: 0.5rem;
  }

  @media (max-width: 600px) {
    .section-title {
      font-size: 1.5rem;
    }
  }