:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --border: #e5e7eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --fg: #f9fafb;
    --muted: #9ca3af;
    --accent: #3b82f6;
    --accent-fg: #ffffff;
    --border: #374151;
  }
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 13px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
}

main {
  width: 320px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.qr {
  width: 288px;
  height: 288px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px;
  box-sizing: border-box;
}

.qr svg {
  width: 100%;
  height: 100%;
  display: block;
}

.qr[data-empty="true"] {
  background: var(--bg);
}

.message {
  margin: 0;
  color: var(--muted);
  text-align: center;
}

.url {
  margin: 0;
  width: 100%;
  font-size: 12px;
  color: var(--muted);
  overflow-wrap: anywhere;
  word-break: break-all;
  text-align: center;
  max-height: 3.6em;
  overflow-y: auto;
}

button {
  font: inherit;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-fg);
  cursor: pointer;
}

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}