* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: system-ui, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
      background: #f8fafc;
      color: #0b1e2e;
      line-height: 1.6;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* header */
    .header {
      background: linear-gradient(145deg, #0b2a3b, #1a445b);
      color: white;
      padding: 2.5rem 0 2rem;
      border-bottom: 6px solid #7fc1d9;
    }

    .header h1 {
      font-size: 2.8rem;
      font-weight: 600;
      letter-spacing: -0.02em;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .header h1 small {
      font-size: 1.2rem;
      font-weight: 400;
      opacity: 0.8;
      margin-left: 0.75rem;
    }

    .header p {
      font-size: 1.2rem;
      opacity: 0.9;
      max-width: 700px;
      margin-top: 0.5rem;
    }

    /* navigation */
    .nav-links {
      display: flex;
      flex-wrap: wrap;
      gap: 0.25rem 1.5rem;
      margin-top: 1.5rem;
      padding-top: 0.75rem;
      border-top: 1px solid rgba(255, 255, 255, 0.2);
    }

    .nav-links a {
      color: #e0f0f7;
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: 0.2s;
      padding: 0.2rem 0;
      border-bottom: 2px solid transparent;
    }

    .nav-links a:hover {
      color: white;
      border-bottom-color: #7fc1d9;
    }

    /* sections */
    section {
      padding: 3rem 0;
      border-bottom: 1px solid #e2e8f0;
    }

    section:last-of-type {
      border-bottom: none;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 1.5rem;
      color: #0b2a3b;
      letter-spacing: -0.01em;
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }

    .section-title span {
      background: #d4e7f0;
      padding: 0.15rem 0.8rem;
      border-radius: 40px;
      font-size: 1rem;
      font-weight: 500;
      color: #0b3b4f;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }

    .card {
      background: white;
      border-radius: 20px;
      padding: 1.8rem 1.5rem;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.04);
      border: 1px solid #edf2f7;
      transition: 0.2s;
    }

    .card:hover {
      box-shadow: 0 12px 24px -8px rgba(0, 30, 50, 0.12);
      border-color: #cbdde8;
    }

    .card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
      color: #1a445b;
    }

    .card h4 {
      font-size: 1.1rem;
      font-weight: 600;
      margin: 0.75rem 0 0.25rem;
      color: #1f4b63;
    }

    .card p, .card li {
      color: #1f3a4a;
    }

    .card ul {
      padding-left: 1.2rem;
      margin: 0.5rem 0 0.2rem;
    }

    .card li {
      margin-bottom: 0.25rem;
    }

    .badge {
      background: #e7f0f6;
      color: #12506b;
      font-weight: 500;
      font-size: 0.8rem;
      padding: 0.2rem 0.7rem;
      border-radius: 30px;
      display: inline-block;
      margin-bottom: 0.5rem;
    }

    .faq-item {
      margin-bottom: 1.5rem;
      border-bottom: 1px dashed #dce7ef;
      padding-bottom: 1.25rem;
    }

    .faq-item:last-child {
      border-bottom: none;
      margin-bottom: 0;
    }

    .faq-q {
      font-weight: 700;
      font-size: 1.2rem;
      color: #0b2a3b;
      display: flex;
      gap: 0.5rem;
    }

    .faq-q::before {
      content: "❓";
      font-size: 1.2rem;
    }

    .faq-a {
      margin-top: 0.3rem;
      padding-left: 2.2rem;
      color: #1e3d51;
    }

    .action-list {
      list-style: none;
      padding-left: 0;
    }

    .action-list li {
      padding: 0.5rem 0 0.5rem 2rem;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="%231a6b8a" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6L9 17l-5-5"/></svg>') left center no-repeat;
      background-size: 1.2rem;
    }

    .doctor-card {
      background: #f1f7fb;
      border-left: 5px solid #4987a3;
    }

    .footnote {
      font-size: 0.9rem;
      opacity: 0.7;
      margin-top: 1.2rem;
    }

    /* responsive */
    @media (max-width: 800px) {
      .grid-2, .grid-3 {
        grid-template-columns: 1fr;
        gap: 1.5rem;
      }

      .header h1 {
        font-size: 2rem;
        flex-wrap: wrap;
      }

      .header h1 small {
        font-size: 1rem;
        margin-left: 0;
      }
    }

    @media (max-width: 480px) {
      .container {
        padding: 0 1rem;
      }
      section {
        padding: 2rem 0;
      }
    }