body {
  background-color: #fbfaf7;
  color: #33312e;
  font-family: 'Zen Kaku Gothic New', sans-serif;
  font-size: 16px;
  line-height: 1.8;
  margin: 0;
  padding: 0;
}

h1 {
  color: #4a6b57;
  font-size: 28px;
  margin-bottom: 8px;
}

h2 {
  color: #4a6b57;
  font-size: 20px;
  margin-top: 40px;
}

a {
  color: #b4703a;
}

.intro {
  color: #6b665f;
}

.icon {
  width: 120px;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  background-color: #4a6b57;
  color: #fbfaf7;
  padding: 16px 24px;
}

.site-name {
  margin: 0;
  font-weight: 700;
}

.nav {
  display: flex;
  gap: 16px;
}

.nav a {
  color: #fbfaf7;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

.about {
  text-align: center;
  padding-top: 32px;
}

.cards {
  display: flex;
  gap: 16px;
}

.card {
  flex: 1;
  background-color: #ffffff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  padding: 16px 20px;
}

.card h3 {
  margin: 0 0 4px;
  color: #4a6b57;
  font-size: 16px;
}

.card p {
  margin: 0;
  color: #6b665f;
  font-size: 14px;
}

.site-footer {
  background-color: #e8e4db;
  text-align: center;
  padding: 24px;
}

.site-footer p {
  margin: 0;
  color: #6b665f;
  font-size: 14px;
}

.site-url {
  margin-top: 4px;
  font-size: 13px;
}

.theme-button {
  background-color: #3c5747;
  color: #fbfaf7;
  border: 1px solid #fbfaf7;
  border-radius: 999px;
  padding: 4px 14px;
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
}

body.dark {
  background-color: #23262a;
  color: #e6e3dd;
}

body.dark h1,
body.dark h2,
body.dark .card h3 {
  color: #9dc4ab;
}

body.dark .intro,
body.dark .card p,
body.dark .site-footer p {
  color: #b0aca4;
}

body.dark .card {
  background-color: #2e3238;
  box-shadow: none;
}

body.dark .site-footer {
  background-color: #2e3238;
}

.memo-form {
  display: flex;
  gap: 8px;
}

.memo-input {
  flex: 1;
  border: 1px solid #d8d3c8;
  border-radius: 8px;
  padding: 8px 12px;
  font-family: inherit;
  font-size: 15px;
}

.memo-button {
  background-color: #4a6b57;
  color: #fbfaf7;
  border: none;
  border-radius: 8px;
  padding: 8px 20px;
  font-family: inherit;
  font-size: 15px;
  cursor: pointer;
}

.memo-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.memo-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
  padding: 10px 16px;
  margin-bottom: 8px;
}

.memo-list button {
  background-color: transparent;
  border: none;
  color: #b4703a;
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
}

body.dark .memo-list li {
  background-color: #2e3238;
  box-shadow: none;
}

@media (max-width: 600px) {
  .site-header {
    flex-direction: column;
    text-align: center;
  }

  .cards {
    flex-direction: column;
  }

  .container {
    padding: 0 16px 32px;
  }

  h1 {
    font-size: 24px;
  }
}