* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
  color: #1f2328;
  background: #f6f8fa;
}

header {
  background: #24292f;
  color: #fff;
  padding: 0.75rem 1.5rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
}

header h1 {
  font-size: 1.2rem;
  margin: 0;
}

header a {
  color: #c9d1d9;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem;
}

section,
.card {
  background: #fff;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1rem;
}

h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

label.inline {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: normal;
  margin-right: 1rem;
}

input[type="text"],
select,
textarea {
  width: 100%;
  padding: 0.4rem;
  font: inherit;
  border: 1px solid #d0d7de;
  border-radius: 4px;
}

textarea {
  min-height: 4rem;
  resize: vertical;
}

button {
  font: inherit;
  padding: 0.4rem 0.8rem;
  border: 1px solid #d0d7de;
  border-radius: 4px;
  background: #f6f8fa;
  cursor: pointer;
}

button:hover {
  background: #eaeef2;
}

button.primary {
  background: #1f883d;
  border-color: #1a7f37;
  color: #fff;
}

button.danger {
  color: #cf222e;
}

.toolbar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.5rem;
  align-items: end;
}

.choice {
  border-left: 3px solid #0969da;
  background: #f6f8fa;
  padding: 0.5rem 0.75rem;
  margin-top: 0.5rem;
}

.messages {
  white-space: pre-wrap;
  font-size: 0.9rem;
}

.messages.error {
  color: #cf222e;
}

.messages.ok {
  color: #1a7f37;
}

pre {
  background: #f6f8fa;
  padding: 0.75rem;
  overflow: auto;
  max-height: 24rem;
  font-size: 0.8rem;
}

.hidden {
  display: none;
}

.muted {
  color: #57606a;
  font-size: 0.9rem;
}