body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  margin: 0;
  padding: 0;
  color: #1a1a1a;
  background: #f7f7f8;
}

header {
  background: #1f2937;
  color: #fff;
  padding: 1rem 1.5rem;
}

header h1 {
  margin: 0 0 0.5rem 0;
  font-size: 1.3rem;
}

.page-nav {
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

.page-nav a {
  color: #93c5fd;
}

.disclaimer {
  background: #fef3c7;
  color: #78350f;
  border: 1px solid #f59e0b;
  border-radius: 4px;
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  margin: 0.25rem 0;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
}

fieldset {
  border: 1px solid #d1d5db;
  border-radius: 6px;
  margin-bottom: 1rem;
}

label {
  display: block;
  margin: 0.5rem 0 0.25rem;
  font-weight: 600;
  font-size: 0.9rem;
}

input[type="text"], select, textarea {
  width: 100%;
  box-sizing: border-box;
  padding: 0.5rem;
  border: 1px solid #d1d5db;
  border-radius: 4px;
  font-size: 0.95rem;
}

.input-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.5rem;
}

button {
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
}

button:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

.error {
  color: #b91c1c;
  min-height: 1.2em;
}

.warning {
  color: #92400e;
  background: #fffbeb;
  border: 1px solid #f59e0b;
  border-radius: 4px;
  padding: 0.5rem;
}

.result-message {
  color: #065f46;
  min-height: 1.2em;
}

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

th, td {
  border: 1px solid #e5e7eb;
  padding: 0.4rem 0.6rem;
  text-align: left;
  font-size: 0.9rem;
}

tr.alert-overdue { background: #fee2e2; }
tr.alert-due_soon { background: #fef3c7; }
tr.alert-undetermined { background: #e5e7eb; color: #6b7280; }

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