:root {
  --navy: #1a1a2e;
  --blue: #4fc3f7;
  --accent: #087ea4;
  --text: #172b4d;
  --muted: #52657a;
  --border: #d9e2ec;
  --surface: #f3f6fa;
}

* {
  box-sizing: border-box;
}

body {
  background: #ffffff;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  margin: 0;
}

header {
  background: var(--navy);
  padding: 18px 20px;
}

header .bar {
  align-items: center;
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 760px;
}

header img {
  display: block;
  height: 34px;
}

nav a {
  color: #c5c5d2;
  font-size: 15px;
  margin-left: 18px;
  text-decoration: none;
}

nav a:hover,
nav a[aria-current='page'] {
  color: var(--blue);
}

main {
  margin: 0 auto;
  max-width: 760px;
  padding: 40px 20px 64px;
}

h1 {
  font-size: 34px;
  line-height: 1.2;
  margin: 0 0 8px;
}

h2 {
  font-size: 22px;
  margin: 40px 0 8px;
}

h3 {
  font-size: 17px;
  margin: 24px 0 4px;
}

p,
li {
  color: #2b3f5c;
}

a {
  color: var(--accent);
}

.updated {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 28px;
}

.lead {
  color: var(--muted);
  font-size: 19px;
}

.summary {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 24px 0;
  padding: 4px 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin: 24px 0;
  padding: 20px;
}

.todo {
  background: #fff3a3;
  border-radius: 3px;
  padding: 0 4px;
}

table {
  border-collapse: collapse;
  font-size: 15px;
  margin: 16px 0;
  width: 100%;
}

th,
td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface);
}

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  margin: 0 auto;
  max-width: 760px;
  padding: 24px 20px 48px;
}

footer a {
  color: var(--muted);
  margin-right: 16px;
}

@media (max-width: 560px) {
  h1 {
    font-size: 28px;
  }

  nav a {
    margin-left: 12px;
  }

  table,
  thead,
  tbody,
  tr,
  th,
  td {
    display: block;
  }

  thead {
    display: none;
  }

  td:first-child {
    background: var(--surface);
    font-weight: 700;
  }
}