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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: #333;
  background: #f5f5f5;
}

/* Header */
header {
  background: #79C5A1;
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 16px 24px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #fff;
}

/* Main */
main {
  padding: 40px 16px 80px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background: #fff;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  padding: 48px 56px;
}

h1 {
  font-size: 26px;
  font-weight: 700;
  color: #111;
  margin-bottom: 8px;
}

.updated {
  font-size: 13px;
  color: #999;
  margin-bottom: 16px;
}

.intro {
  font-size: 15px;
  color: #444;
  margin-bottom: 36px;
  padding: 16px 20px;
  background: #f0faf5;
  border-radius: 6px;
  border-left: 3px solid #79C5A1;
}

section {
  margin-bottom: 36px;
}

h2 {
  font-size: 17px;
  font-weight: 700;
  color: #111;
  margin-bottom: 12px;
  padding-left: 12px;
  border-left: 3px solid #79C5A1;
}

p {
  font-size: 15px;
  color: #444;
  margin-bottom: 12px;
}

ul, ol {
  padding-left: 20px;
  margin-bottom: 12px;
}

ol ol {
  list-style-type: lower-latin;
  margin-top: 6px;
  margin-bottom: 0;
}

li {
  font-size: 15px;
  color: #444;
  margin-bottom: 6px;
}

.contact-box {
  background: #f0faf5;
  border-radius: 6px;
  padding: 20px 24px;
  margin-top: 12px;
  border-left: 3px solid #79C5A1;
}

.contact-box p {
  margin-bottom: 4px;
}

.meta {
  font-size: 13px;
  color: #999;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid #e0e0e0;
}

/* Footer */
footer {
  text-align: center;
  padding: 24px;
  font-size: 12px;
  color: #aaa;
}

/* Tablet */
@media (max-width: 768px) {
  .container {
    padding: 40px 40px;
  }
}

/* Mobile */
@media (max-width: 480px) {
  main {
    padding: 0 0 60px;
  }

  .container {
    border-radius: 0;
    border-left: none;
    border-right: none;
    padding: 28px 20px;
  }

  h1 {
    font-size: 20px;
  }

  h2 {
    font-size: 15px;
  }

  p, li {
    font-size: 14px;
  }

  .intro {
    font-size: 14px;
    padding: 14px 16px;
  }

  .updated {
    margin-bottom: 12px;
  }

  section {
    margin-bottom: 28px;
  }

  .contact-box {
    padding: 16px;
  }

  .meta {
    font-size: 12px;
    margin-top: 28px;
    padding-top: 16px;
  }
}