body {
  font-family: system-ui, sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #1a1a1a;
}

header {
  background: #1f2937;
  color: #fff;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  background: #fff;
}

th, td {
  border: 1px solid #ddd;
  padding: 0.5rem;
  text-align: left;
  font-size: 0.9rem;
}

form label, #key-section label {
  display: block;
  margin-bottom: 0.5rem;
}

button {
  margin-top: 0.5rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
}

#key-section {
  margin-top: 1rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid #ddd;
}

#decrypt-results {
  margin-top: 1rem;
}

.decrypt-result {
  background: #fff;
  border: 1px solid #ddd;
  padding: 1rem;
  margin-bottom: 1rem;
}

.decrypt-result pre {
  white-space: pre-wrap;
  word-break: break-all;
  background: #f0f0f0;
  padding: 0.5rem;
}

.decrypt-error {
  color: #b91c1c;
  border-color: #b91c1c;
}