* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2rem 1rem;
  background: #f5f5f5;
  color: #1f2937;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
}

.card {
  max-width: 560px;
  margin: 0 auto;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.5rem;
}

h1 {
  margin: 0 0 1rem;
  font-size: 1.5rem;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.section + .section {
  margin-top: 1.25rem;
}

.field {
  display: block;
  margin-bottom: 0.75rem;
}

.field span {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

input,
select,
button {
  width: 100%;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  padding: 0.65rem 0.75rem;
  font: inherit;
}

button {
  margin-top: 0.25rem;
  border: none;
  background: #111827;
  color: #ffffff;
  cursor: pointer;
  font-weight: 600;
}

button:disabled {
  background: #6b7280;
  cursor: not-allowed;
}

.hint {
  margin: 0;
  color: #4b5563;
  font-size: 0.9rem;
}

.status {
  min-height: 1.25rem;
  margin-top: 1rem;
}

.status.error {
  color: #dc2626;
}

.result {
  margin-top: 1rem;
}

.hidden {
  display: none;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 0.6rem;
  border: 1px solid #e5e7eb;
  text-align: left;
}

tr:nth-child(even) {
  background: #f9fafb;
}

.button-link {
  display: block;
  margin-top: 0.75rem;
  text-align: center;
  text-decoration: none;
  background: #111827;
  color: #ffffff;
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font-weight: 600;
}

footer {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: #4b5563;
}