.qr-tool {
  color-scheme: light;
  --qr-bg: #ebe9e4;
  --qr-surface: #ffffff;
  --qr-surface-strong: #dedbd4;
  --qr-text: #1d1d1f;
  --qr-muted: #67655f;
  --qr-line: #d2cec5;
  --qr-accent: #1d1d1f;
  --qr-accent-hover: #000000;
  --qr-danger: #9b2f26;
  --qr-danger-hover: #772018;
  --qr-shadow: 0 18px 45px rgba(29, 29, 31, 0.08);
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--qr-line);
  border-radius: 8px;
  background: var(--qr-bg);
  color: var(--qr-text);
  box-shadow: var(--qr-shadow);
}

.qr-tool,
.qr-tool * {
  box-sizing: border-box;
}

.qr-tool button,
.qr-tool input,
.qr-tool select {
  font: inherit;
}

.qr-workspace {
  display: grid;
  grid-template-columns: minmax(250px, 320px) minmax(420px, 1fr);
  gap: 16px;
  align-items: start;
  width: 100%;
  padding: 16px clamp(12px, 2vw, 24px) 28px;
}

.qr-preview-panel,
.qr-control-panel {
  width: 100%;
  min-width: 0;
}

.qr-preview-panel {
  display: grid;
}

.qr-canvas-shell {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 1 / 1;
  min-height: 0;
  padding: clamp(16px, 3vw, 32px);
  overflow: hidden;
  border: 1px solid var(--qr-line);
  border-radius: 8px;
  background: var(--qr-surface);
  box-shadow: var(--qr-shadow);
}

.qr-tool canvas {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  max-height: 100%;
  aspect-ratio: 1 / 1;
}

.qr-empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 8px;
  padding: 22px;
  color: var(--qr-muted);
  text-align: center;
  pointer-events: none;
}

.qr-empty-state strong {
  color: var(--qr-text);
  font-size: 1.15rem;
}

.qr-empty-state.is-hidden {
  display: none;
}

.qr-control-panel {
  order: -1;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-self: start;
}

.qr-control-group,
.qr-credits {
  border: 1px solid var(--qr-line);
  border-radius: 8px;
  background: var(--qr-surface);
  padding: 12px;
}

.qr-control-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: -2px 0 2px;
  color: var(--qr-text);
  font-size: 0.92rem;
  font-weight: 800;
  list-style: none;
  cursor: pointer;
}

.qr-control-group summary::-webkit-details-marker {
  display: none;
}

.qr-control-group summary::after {
  content: "+";
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border: 1px solid var(--qr-line);
  border-radius: 50%;
  color: var(--qr-muted);
  font-size: 0.9rem;
  line-height: 1;
}

.qr-control-group[open] summary::after {
  content: "-";
}

.qr-control-group label {
  display: grid;
  gap: 6px;
  margin-top: 9px;
  color: var(--qr-muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.qr-control-group label > span {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.qr-tool output {
  color: var(--qr-text);
  font-variant-numeric: tabular-nums;
}

.qr-tool select,
.qr-tool input[type="text"] {
  width: 100%;
  border: 1px solid var(--qr-line);
  border-radius: 8px;
  background: var(--qr-surface);
  color: var(--qr-text);
  padding: 9px 11px;
}

.qr-tool input[type="range"] {
  width: 100%;
  accent-color: var(--qr-accent);
}

.qr-tool input[type="color"] {
  width: 100%;
  height: 34px;
  padding: 4px;
  border: 1px solid var(--qr-line);
  border-radius: 8px;
  background: var(--qr-surface-strong);
}

.qr-color-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.qr-check-row {
  display: flex !important;
  align-items: center;
  gap: 10px !important;
}

.qr-check-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--qr-accent);
}

.qr-status-text {
  min-height: 1.3em;
  margin: 10px 0 0;
  color: var(--qr-muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.qr-download-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.qr-tool button {
  min-height: 40px;
  padding-inline: 10px;
  border: 0;
  border-radius: 8px;
  background: var(--qr-accent);
  color: #ffffff;
  font-weight: 800;
  cursor: pointer;
  transition: background 160ms ease, transform 160ms ease;
}

.qr-tool button:hover {
  background: var(--qr-accent-hover);
  transform: translateY(-1px);
}

.qr-danger-button {
  background: var(--qr-danger) !important;
}

.qr-danger-button:hover {
  background: var(--qr-danger-hover) !important;
}

.qr-credits {
  display: grid;
  gap: 6px;
  color: var(--qr-muted);
  font-size: 0.76rem;
  font-weight: 700;
  text-align: center;
}

@media (max-width: 980px) {
  .qr-workspace {
    grid-template-columns: 1fr;
  }

  .qr-control-panel {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .qr-download-row,
  .qr-credits {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .qr-control-panel,
  .qr-download-row,
  .qr-color-row {
    grid-template-columns: 1fr;
  }
}