body {
  font-family: "Segoe UI", sans-serif;
  background: #f4f6f8;
  color: #1c2430;
  margin: 0;
}

main {
  max-width: 40rem;
  margin: 2rem auto;
  padding: 0 1rem 3rem;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: .4rem;
}

.card {
  background: #fff;
  border: 1px solid #dde3ea;
  border-radius: 12px;
  padding: 1.25rem;
  margin: 1rem 0;
}

label {
  display: block;
  margin: .9rem 0 .3rem;
  font-weight: 600;
}

.check {
  font-weight: 400;
  margin: .35rem 0;
}

input[type="text"],
input[type="password"],
input[type="number"] {
  width: 100%;
  box-sizing: border-box;
  padding: .55rem .7rem;
  border: 1px solid #c5ced8;
  border-radius: 8px;
  font: inherit;
}

button,
.btn {
  background: #1f6feb;
  color: #fff;
  border: 0;
  border-radius: 8px;
  padding: .6rem 1rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  font: inherit;
  margin-top: 1rem;
}

.mono {
  font-family: Consolas, monospace;
  background: #eef2f6;
  padding: .45rem .6rem;
  border-radius: 8px;
  word-break: break-all;
  display: block;
}

.error { color: #9b1c1c; }
.warn { color: #8a5a00; }
.ok { color: #0f6b3a; }
.muted { color: #5c6b7a; }
pre {
  white-space: pre-wrap;
  background: #eef2f6;
  padding: .8rem;
  border-radius: 8px;
}