body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f6f8fb;
  color: #0b1220;
  line-height: 1.55;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 32px 20px 72px;
}

h1 {
  font-size: 1.7rem;
  line-height: 1.2;
}

h2 {
  margin-top: 1.6rem;
  font-size: 1.15rem;
}

.muted {
  color: #5a6b7d;
}

.card {
  margin: 16px 0;
  padding: 18px 20px;
  border: 1px solid #d8e2ec;
  border-radius: 12px;
  background: #fff;
}

a.card {
  display: block;
  color: inherit;
  text-decoration: none;
}

a.card strong {
  color: #0b4f9c;
}

ul {
  padding-left: 1.15rem;
}

li {
  margin: 8px 0;
}

.btn {
  display: inline-block;
  margin: 6px 8px 6px 0;
  padding: 12px 16px;
  border-radius: 8px;
  background: #168bff;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.btn2 {
  background: #0a7a3e;
}

.btn3 {
  border: 1px solid #d8e2ec;
  background: #fff;
  color: #0b1220;
}

.fine {
  color: #687586;
  font-size: 0.88rem;
}

.ex,
.script {
  margin: 10px 0;
  padding: 14px 16px;
  border-radius: 10px;
  background: #0b1220;
  color: #e8eef6;
  white-space: pre-wrap;
}

.script {
  padding: 16px 18px;
  font-size: 0.98rem;
}

.warn {
  padding-left: 12px;
  border-left: 4px solid #c47b00;
}