:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --panel: #111827;
  --border: #1f2937;
  --muted: #9ca3af;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --dash: #334155;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, 'Microsoft Yahei', sans-serif;
  background: var(--bg);
  color: #e2e8f0;
}
.site-header,
.site-footer {
  text-align: center;
  padding: 20px;
}
.header-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: center;
  justify-items: center;
}
.header-bar h1 {
  margin: 0;
  grid-column: 2;
}
.header-actions {
  grid-column: 3;
  justify-self: end;
  display: flex;
  gap: 12px;
  align-items: center;
}
.lang-switch.field {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}
.lang-switch.field span {
  white-space: nowrap;
  color: var(--muted);
}
main {
  max-width: 960px;
  margin: 0 auto 32px;
  padding: 24px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}
.controls {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  align-items: end;
  margin-bottom: 16px;
}
.span-2 {
  grid-column: span 2;
}
.span-4 {
  grid-column: 1 / -1;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.field span {
  font-size: 14px;
  color: var(--muted);
}
.select,
.input {
  width: 100%;
}
.slider-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.slider {
  flex: 1;
}
.slider-value {
  min-width: 36px;
  text-align: right;
  font-size: 13px;
  color: var(--muted);
}
.input {
  appearance: none;
  background: #0b1220;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: #e2e8f0;
}
.input[type='range'] {
  padding: 0;
  background: transparent;
  border: none;
}
.slider,
.input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
}
.slider::-webkit-slider-runnable-track,
.input[type='range']::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--dash);
  border-radius: 999px;
}
.slider::-webkit-slider-thumb,
.input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #020617;
  margin-top: -5px;
}
.slider::-moz-range-track,
.input[type='range']::-moz-range-track {
  height: 4px;
  background: var(--dash);
  border-radius: 999px;
}
.slider::-moz-range-thumb,
.input[type='range']::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #020617;
}
.input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.select {
  appearance: none;
  background: #0b1220;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  color: #e2e8f0;
}
.header-actions .select {
  width: auto;
  min-width: 140px;
}
.actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  grid-column: 1 / -1;
  flex-wrap: wrap;
  align-items: center;
}
.file-upload .file-button {
  display: flex;
  gap: 10px;
  align-items: center;
  min-width: 0;
}
.file-upload .file-button .btn {
  display: block;
  width: 80%;
  max-width: 420px;
  min-width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-upload .file-name {
  font-size: 12px;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}
.preview {
  display: grid;
  place-items: center;
  border: 1px dashed var(--dash);
  border-radius: 12px;
  padding: 12px;
  background: #020617;
  position: relative;
}
canvas {
  max-width: 100%;
  height: auto;
  background: #020617;
}
.preview-toggle {
  position: absolute;
  right: 10px;
  bottom: 10px;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.9);
  color: #e5e7eb;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
}
.preview-toggle:hover {
  border-color: var(--accent);
  background: rgba(15, 23, 42, 1);
}
.preview-toggle:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  border-color: var(--border);
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0b1220;
  color: #e2e8f0;
  cursor: pointer;
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover {
  background: var(--accent-hover);
}
.btn:hover {
  border-color: var(--dash);
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  border-color: var(--border);
}
.site-footer .legal {
  margin-top: 8px;
  display: grid;
  gap: 4px;
  justify-items: center;
  color: var(--muted);
  font-size: 12px;
}
.site-footer .legal a {
  color: var(--muted);
  text-decoration: none;
}
.site-footer .legal a:hover {
  text-decoration: underline;
}
@media (max-width: 768px) {
  .controls {
    grid-template-columns: 1fr 1fr;
  }
  .span-2 {
    grid-column: 1 / -1;
  }
}