:root {
  --bg: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --card: #f9fafb;
  --border: #e5e7eb;
}

[data-theme="dark"] {
  --bg: #111827;
  --text: #f9fafb;
  --muted: #9ca3af;
  --card: #1f2933;
  --border: #374151;
}

body {
  font-family: Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
}

.container {
  max-width: 900px;
  margin: auto;
  padding: 1rem;
}

.skip-link {
  position: absolute;
  top: -40px;
}
.skip-link:focus {
  top: 0;
}

input, select, button {
  width: 100%;
  padding: 0.6rem;
  margin: 0.4rem 0;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 1rem;
}

button {
  cursor: pointer;
  min-height: 44px;
}

.toggle {
  width: auto;
  float: right;
  margin-bottom: 1rem;
}

.subtitle {
  color: var(--muted);
  margin-top: -0.5rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.alert {
  padding: 0.7rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  transition: box-shadow 0.3s ease;
}

.alert.warning {
  border-color: #facc15;
  box-shadow: 0 0 12px rgba(250, 204, 21, 0.25);
}

.alert.danger {
  border-color: #f87171;
  box-shadow: 0 0 14px rgba(248, 113, 113, 0.3);
}

.output-panel {
  min-height: 300px;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  white-space: pre-wrap;
  overflow-x: auto;
  background: var(--card);
}

.placeholder {
  color: var(--muted);
}

.footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 600px) {
  .container {
    padding: 0.5rem;
  }

  input, select, button {
    font-size: 0.95rem;
  }
}