:root {
  font-family: "Segoe UI", Tahoma, Verdana, sans-serif;
  color: #24303e;
  background: #e9edf2;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
a {
  color: #245b91;
}
a:focus-visible {
  outline: 2px solid #d58932;
  outline-offset: 2px;
}
.shell {
  max-width: 960px;
  min-height: 100vh;
  margin: auto;
  border-left: 1px solid #cad3dc;
  border-right: 1px solid #cad3dc;
  background: #f7fafc;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 17px 24px;
  border-bottom: 1px solid #7e98b0;
  background: linear-gradient(#fdfefe, #dce6ef);
  font-size: 13px;
}
header a {
  text-decoration: none;
  font-weight: 700;
}
nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
nav.crumb {
  gap: 8px;
  color: #657382;
  font-size: 12px;
}
nav.crumb a {
  font-weight: 400;
}
main {
  max-width: 750px;
  padding: 34px 24px 60px;
}
.kicker {
  color: #657382;
  font:
    700 11px Consolas,
    monospace;
}
h1 {
  margin: 8px 0 18px;
  color: #1f4364;
  font-size: 32px;
}
h2 {
  margin: 30px 0 9px;
  padding-bottom: 6px;
  border-bottom: 1px solid #c8d3dc;
  color: #294d6d;
  font-size: 17px;
}
p,
li {
  font-size: 13px;
  line-height: 1.65;
}
li {
  margin: 5px 0;
}
.notice {
  padding: 12px 15px;
  border: 1px solid #a8bdcb;
  background: #ebf4f9;
}
footer {
  padding: 16px 24px;
  border-top: 1px solid #a6b9c8;
  background: #e0e9f1;
  color: #596b7a;
  font-size: 11px;
}
.guide-list {
  display: grid;
  gap: 16px;
  margin: 25px 0;
}
.guide-list article {
  padding: 15px 18px;
  border: 1px solid #b5c5d2;
  background: #fff;
}
.guide-list article h2 {
  margin-top: 4px;
}
.guide-action {
  display: inline-block;
  padding: 10px 14px;
  border: 1px solid #1f507f;
  background: #245b91;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}
code {
  overflow-wrap: anywhere;
}
@media (max-width: 550px) {
  header {
    align-items: flex-start;
    flex-direction: column;
  }
  main {
    padding: 24px 17px 50px;
  }
  h1 {
    font-size: 27px;
  }
}