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

html {
  background: #f7f0e7;
}

body {
  max-width: 860px;
  margin: 40px auto;
  padding: 48px;
  color: #302a26;
  background: #fffdfa;
  border-radius: 18px;
  box-shadow: 0 16px 45px rgba(62, 46, 38, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", YuGothic, Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.85;
}

h1,
h2 {
  color: #3a2b25;
  line-height: 1.45;
}

h1 {
  margin: 0 0 32px;
  padding-bottom: 16px;
  border-bottom: 3px solid #3f765c;
  font-size: clamp(1.75rem, 4vw, 2.2rem);
}

h2 {
  margin: 2.2em 0 0.7em;
  font-size: 1.2rem;
}

ul {
  padding-left: 1.4em;
}

a {
  color: #285d46;
  font-weight: 700;
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 3px solid #9ab5a2;
  outline-offset: 3px;
}

footer {
  margin-top: 48px;
  padding-top: 20px;
  color: #6d635b;
  border-top: 1px solid #ddcfc1;
  font-size: 0.88rem;
  text-align: center;
}

@media (max-width: 640px) {
  html {
    background: #fffdfa;
  }

  body {
    margin: 0;
    padding: 32px 20px;
    border-radius: 0;
    box-shadow: none;
  }
}