:root {
  color-scheme: light dark;
  font-family: system-ui, sans-serif;
}

body {
  margin: 0;
  padding: 2rem;
  background: #f4f5f7;
  color: #1a1a1a;
}

main {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

h1 {
  font-size: 1.4rem;
}

.card {
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 1rem 1.25rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.05rem;
}

label {
  display: block;
  margin-bottom: 0.6rem;
  font-size: 0.9rem;
}

input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  padding: 0.4rem 0.5rem;
  margin-top: 0.2rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 0.95rem;
}

button {
  margin: 0.2rem 0.4rem 0.2rem 0;
  padding: 0.45rem 0.9rem;
  border: none;
  border-radius: 4px;
  background: #2563eb;
  color: white;
  font-size: 0.9rem;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

.hint {
  font-size: 0.8rem;
  color: #666;
  margin-bottom: 0;
}

#log {
  background: #0f172a;
  color: #e2e8f0;
  padding: 0.75rem;
  border-radius: 6px;
  max-height: 320px;
  overflow-y: auto;
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-word;
}

code {
  background: #eef0f3;
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #111318;
    color: #e5e7eb;
  }
  .card {
    background: #1a1d24;
    border-color: #2a2d36;
  }
  input {
    background: #0f1115;
    color: #e5e7eb;
    border-color: #3a3d46;
  }
  code {
    background: #262a33;
  }
}