* {
    box-sizing: border-box;
  }
  
  html {
    font-size: 17px;
  }
  
  body {
    margin: 0;
    background: #fff;
    color: #222;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.7;
  }
  
  main {
    max-width: 720px;
    margin: 0 auto;
    padding: 80px 28px;
  }
  
  header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 96px;
  }
  
  h1 {
    margin: 0;
    font-size: 2.2rem;
    font-weight: 500;
    letter-spacing: -0.03em;
  }
  
  nav {
    display: flex;
    gap: 24px;
  }
  
  a {
    color: inherit;
    text-decoration-thickness: 1px;
    text-underline-offset: 4px;
  }
  
  .intro {
    margin-bottom: 96px;
  }
  
  section {
    margin-bottom: 96px;
  }
  
  h2 {
    margin-bottom: 36px;
    font-size: 1.1rem;
    font-weight: 600;
  }
  
  h3 {
    margin-bottom: 4px;
    font-size: 1rem;
    font-weight: 500;
  }
  
  .status {
    margin-top: 0;
    color: #666;
  }
  
  footer {
    margin-top: 120px;
    padding-top: 24px;
    border-top: 1px solid #ddd;
    font-size: 0.9rem;
  }
  
  @media (max-width: 600px) {
    main {
      padding: 48px 22px;
    }
  
    header {
      display: block;
      margin-bottom: 72px;
    }
  
    nav {
      margin-top: 16px;
    }
  }