* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  color: #222;
  background: #fff;
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.site-header {
  border-bottom: 1px solid #ececec;
  background: #fff;
}

.site-header__inner {
  width: min(100%, 1080px);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: #111;
}

.site-logo img {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.site-nav {
  display: inline-flex;
  align-items: center;
  gap: 28px;
  font-size: 13px;
  font-weight: 600;
  color: #1f1f1f;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.site-nav .nav-icon {
  color: #ff214f;
  font-size: 15px;
}

.page-shell {
  width: min(100%, 1080px);
  margin: 0 auto;
  padding: 34px 24px 80px;
}

.page-title {
  margin: 0 0 24px;
  font-size: 22px;
  font-weight: 700;
  color: #222;
}

.page-subtitle {
  margin: 0 0 28px;
  font-size: 14px;
  color: #666;
}

.content-card {
  border: 1px solid #ececec;
  border-radius: 18px;
  background: #fff;
}

.text-link {
  color: #2f6cff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.site-footer {
  margin-top: 80px;
  background: #fff;
}

.site-footer__main {
  width: min(100%, 1080px);
  margin: 0 auto;
  border-top: 1px solid #e8e8e8;
  padding: 34px 24px 28px;
  display: flex;
  justify-content: space-between;
  gap: 32px;
}

.site-footer__brand {
  max-width: 300px;
}

.site-footer__brand .site-logo {
  font-size: 14px;
}

.site-footer__brand p {
  margin: 14px 0 0;
  font-size: 12px;
  color: #666;
}

.site-footer__links {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 24px 42px;
  font-size: 12px;
  color: #666;
}

.site-footer__links h4 {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  color: #333;
}

.site-footer__links a,
.site-footer__links span {
  display: block;
  margin-top: 8px;
}

.site-footer__bottom {
  background: #2c2c2c;
  color: #fff;
  text-align: center;
  padding: 14px 12px;
  font-size: 12px;
}

.article {
  max-width: 760px;
}

.article h1 {
  margin: 0 0 24px;
  font-size: 20px;
  font-weight: 700;
  color: #222;
}

.article h2 {
  margin: 26px 0 10px;
  font-size: 16px;
  font-weight: 700;
}

.article p,
.article li {
  font-size: 13px;
  color: #333;
}

.article ol,
.article ul {
  margin: 6px 0 12px 22px;
  padding: 0;
}

.article section {
  margin-top: 18px;
}

.notes-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
}

.notes-table th,
.notes-table td {
  border: 1px solid #cfcfcf;
  padding: 14px 16px;
  vertical-align: top;
  font-size: 13px;
}

.notes-table th {
  width: 34%;
  background: #fafafa;
  text-align: left;
  font-size: 14px;
}

.notes-table ul {
  margin: 8px 0 0 18px;
}

@media (max-width: 860px) {
  .site-header__inner,
  .page-shell,
  .site-footer__main {
    padding-left: 18px;
    padding-right: 18px;
  }

  .site-nav {
    gap: 18px;
    font-size: 12px;
  }

  .site-footer__main {
    flex-direction: column;
  }

  .article {
    max-width: none;
  }

  .notes-table,
  .notes-table tbody,
  .notes-table tr,
  .notes-table th,
  .notes-table td {
    display: block;
    width: 100%;
  }

  .notes-table tr {
    border: 1px solid #cfcfcf;
    margin-bottom: 12px;
  }

  .notes-table th,
  .notes-table td {
    border: none;
  }

  .notes-table th {
    border-bottom: 1px solid #e1e1e1;
  }
}