:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

body {
  margin: 0;
  color: #000;
  background: #fff;
  font-size: 16px;
  line-height: 1.55;
}

a {
  color: #000;
}

a:focus-visible {
  outline: 2px solid #000;
  outline-offset: 3px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
  padding: 12px max(20px, calc((100% - 920px) / 2));
  border-bottom: 1px solid #000;
}

.site-brand {
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
}

.site-header nav,
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.site-main {
  width: min(920px, calc(100% - 40px));
  margin: 48px auto 72px;
}

.site-main > :first-child {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

h1 {
  margin: 0 0 12px;
  font-size: 34px;
}

h2 {
  margin: 44px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #000;
  font-size: 23px;
}

h3 {
  margin: 28px 0 8px;
  font-size: 18px;
}

p,
ul,
ol,
table {
  margin: 0 0 18px;
}

li + li {
  margin-top: 7px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 10px;
  border: 1px solid #000;
  text-align: left;
  vertical-align: top;
}

.extension-heading {
  display: grid;
  grid-template-columns: 96px 1fr;
  align-items: center;
  gap: 20px;
  margin-bottom: 36px;
}

.extension-heading img {
  display: block;
  width: 96px;
  height: 96px;
}

.extension-heading h1,
.extension-heading p {
  margin: 0;
}

.extension-heading p {
  margin-top: 6px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 28px;
  padding-left: 22px;
}

.notice {
  padding: 14px 16px;
  border: 1px solid #000;
}

.site-footer,
.desmosplus-site-footer {
  border-top: 1px solid #000;
}

.site-footer {
  padding: 20px max(20px, calc((100% - 920px) / 2));
}

.site-footer p {
  margin: 12px 0 0;
  font-size: 14px;
}

.desmosplus-site-footer {
  width: min(720px, calc(100% - 32px));
  margin: 48px auto 24px;
  padding-top: 16px;
  font: 14px -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.desmosplus-site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.desmosplus-site-footer a {
  color: #000;
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .site-main {
    margin-top: 32px;
  }

  .feature-list {
    grid-template-columns: 1fr;
  }

  .extension-heading {
    grid-template-columns: 72px 1fr;
  }

  .extension-heading img {
    width: 72px;
    height: 72px;
  }

  table {
    display: block;
    overflow-x: auto;
  }
}