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

body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
        line-height: 1.7;
        color: #333;
        background-color: #fff;
    }

main {
        max-width: 1100px;
        margin: 0 auto;
        padding: 3rem 1.5rem 4rem;
    }

h1 {
        font-size: 1.875rem;
        font-weight: 600;
        margin-bottom: 0.5rem;
        color: #1a1a1a;
    }

h2 {
        font-size: 1.5rem;
        font-weight: 600;
        margin-top: 2rem;
        margin-bottom: 1rem;
        color: #1a1a1a;
    }

h3 {
        font-size: 1.125rem;
        font-weight: 700;
        margin-top: 2rem;
        margin-bottom: 0.75rem;
        color: #1a1a1a;
    }

h4 {
        font-size: 1rem;
        font-weight: 600;
        margin-top: 2rem;
        margin-bottom: 0.5rem;
        color: #1a1a1a;
    }

p {
        margin-bottom: 1rem;
    }

.intro-text {
        margin-top: 2rem;
    }

ul {
        margin-left: 2rem;
        margin-bottom: 1rem;
        list-style-type: disc;
    }

ul ul {
        list-style-type: circle;
        margin-top: 0.5rem;
    }

ul ul ul {
        list-style-type: decimal;
    }

li {
        margin-bottom: 0.75rem;
    }

li p {
        margin-bottom: 0.25rem;
    }

strong {
        font-weight: 600;
    }

a {
        color: #3b82f6;
        text-decoration: underline;
    }

a:hover {
        color: #2563eb;
    }

.last-updated {
        color: #666;
        font-size: 0.9rem;
    }

/* FOOTER */
footer {
  background-color: #ffffff; /* solid white */
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
  padding: 16px 24px;
  border-top: 1px solid #e5e7eb;
  margin-top: 40px;
}

footer p {
  font-size: 14px;
  color: #6e6e73;
}

@media (max-width: 640px) {
    main {
    padding: 2rem 1rem 3rem;
    }

    h1 {
    font-size: 1.5rem;
    }

    h2 {
    font-size: 1.25rem;
    }

    ul {
    margin-left: 1.5rem;
    }
}