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

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #ffffff;
  color: #111111;
  line-height: 1.7;
  letter-spacing: -0.01em;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
}

a {
  color: #111111;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
}

a:hover {
  color: #000;
}

h1 {
  font-size: 1.6rem;
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
}

hr {
  border: none;
  border-top: 1.5px solid #ccc;
  margin: 2.5rem 0;
}

/* ---- back link ---- */

.back {
  margin-bottom: 2rem;
}

.back a {
  font-size: 0.85rem;
  color: #bbb;
}

.back a:hover {
  color: #000;
  text-decoration: none;
}

/* ---- footer ---- */

.footer-links {
  display: flex;
  gap: 1.5rem;
  margin-top: 0.5rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: #bbb;
}

.footer-links a:hover {
  color: #000;
  text-decoration: none;
}

/* ---- responsive ---- */

@media (max-width: 600px) {
  body {
    padding: 2rem 1rem 4rem;
  }
}

/* ---- dark mode ---- */

@media (prefers-color-scheme: dark) {
  body {
    background: #111111;
    color: #e0e0e0;
  }

  a {
    color: #e0e0e0;
  }

  a:hover {
    color: #ffffff;
  }

  hr {
    border-top-color: #333;
  }

  .back a,
  .footer-links a {
    color: #555;
  }

  .back a:hover,
  .footer-links a:hover {
    color: #ffffff;
  }

  h1 {
    color: #e0e0e0;
  }
}