*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --surface-alt: #f6f6f8;
  --border: #e0e0e0;
  --text: #111111;
  --text-muted: #555555;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #dc2626;
  --warning: #f59e0b;
  --success: #16a34a;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --surface: #1a1a1a;
    --surface-alt: #252525;
    --border: #333333;
    --text: #f0f0f0;
    --text-muted: #a0a0a0;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
  }
}

html {
  font-size: 16px;
}

body {
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  max-width: 1000px;
  margin: 0 auto;
  padding: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

@media (min-width: 640px) {
  body {
    padding: 24px 32px;
  }
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 8px 0;
  line-height: 1.3;
}

@media (min-width: 640px) {
  h1 {
    font-size: 2rem;
  }
}

.intro {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0 0 24px 0;
}

.warning-banner {
  background: linear-gradient(135deg, var(--danger), #991b1b);
  color: white;
  padding: 16px;
  border-radius: var(--radius);
  margin-bottom: 24px;
  font-size: 0.9rem;
}

.warning-banner strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 4px;
}

fieldset {
  margin: 0 0 20px 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  min-width: 0;
  overflow: hidden;
}

@media (min-width: 640px) {
  fieldset {
    padding: 20px;
  }
}

legend {
  padding: 0 8px;
  font-weight: 600;
  font-size: 1rem;
}

pre {
  background: var(--surface-alt);
  padding: 12px;
  border-radius: var(--radius);
  overflow-x: auto;
  overflow-y: auto;
  font-size: 0.7rem;
  line-height: 1.5;
  margin: 12px 0;
  max-height: 50vh;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: anywhere;
  max-width: 100%;
}

@media (min-width: 640px) {
  pre {
    font-size: 0.8rem;
    max-height: 60vh;
    word-break: break-word;
  }
}

.muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

button {
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s ease;
  touch-action: manipulation;
}

button:hover {
  background: var(--surface-alt);
  border-color: var(--accent);
}

button:active {
  transform: scale(0.98);
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

button.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.controls {
  display: grid;
  gap: 8px;
  margin-bottom: 12px;
}

@media (min-width: 480px) {
  .controls {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

label.switch {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  padding: 8px 12px;
  background: var(--surface-alt);
  border-radius: var(--radius);
  font-size: 0.9rem;
  user-select: none;
  transition: background 0.15s ease;
}

label.switch:hover {
  background: var(--border);
}

label.switch input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.button-row {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 400px) {
  .button-row {
    grid-template-columns: 1fr;
  }
}

.info-section h2 {
  font-size: 1.1rem;
  margin: 0 0 12px 0;
  color: var(--text);
}

.info-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 640px) {
  .info-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
}

.info-card {
  background: var(--surface-alt);
  padding: 12px 14px;
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}

.info-card strong {
  display: block;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.info-card p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.ethics-note {
  background: linear-gradient(135deg, var(--success), #15803d);
  color: white;
  padding: 16px;
  border-radius: var(--radius);
  margin-top: 16px;
  font-size: 0.9rem;
}

.ethics-note strong {
  display: block;
  margin-bottom: 4px;
}

.fingerprint-display {
  background: linear-gradient(135deg, var(--accent), #1e40af);
  color: white;
  padding: 12px 16px;
  border-radius: var(--radius);
  margin: 12px 0;
  font-family: monospace;
  font-size: 0.75rem;
  word-break: break-all;
  text-align: center;
}

@media (min-width: 640px) {
  .fingerprint-display {
    font-size: 0.85rem;
  }
}

.fingerprint-display .label {
  display: block;
  font-family: system-ui, sans-serif;
  font-weight: 600;
  font-size: 0.8rem;
  margin-bottom: 6px;
  opacity: 0.9;
}

.stat-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 16px 0;
  padding: 12px;
  background: var(--surface-alt);
  border-radius: var(--radius);
}

.stat {
  flex: 1;
  min-width: 100px;
  text-align: center;
}

.stat .value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.stat .desc {
  font-size: 0.75rem;
  color: var(--text-muted);
}

footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

.loading {
  display: inline-block;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

details {
  margin-bottom: 20px;
}

details summary {
  cursor: pointer;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow);
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::after {
  content: "▸";
  transition: transform 0.2s ease;
}

details[open] summary::after {
  transform: rotate(90deg);
}

details[open] summary {
  border-radius: var(--radius) var(--radius) 0 0;
}

details .content {
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}