:root {
  color-scheme: light dark;
  --bg: #f5f5f5;
  --panel: #ffffff;
  --text: #1f1f1f;
  --muted: #666666;
  --border: #d7d7d7;
  --accent: #1d4ed8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --panel: #1d1d1d;
    --text: #f1f1f1;
    --muted: #b9b9b9;
    --border: #3a3a3a;
    --accent: #7aa2ff;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.45 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.container {
  width: min(1100px, calc(100% - 32px));
  margin: 24px auto 40px;
}
.page-header { margin-bottom: 18px; }
.page-header h1 { margin: 0 0 8px; }
.page-header p { margin: 0; color: var(--muted); }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 18px;
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.compact-grid { gap: 12px; }
.field {
  display: block;
  margin-bottom: 14px;
}
.field > span {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}
input[type="text"],
input[type="file"],
select,
textarea,
button {
  font: inherit;
}
input[type="text"],
input[type="file"],
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: inherit;
}
textarea {
  min-height: 78px;
  resize: vertical;
}
input[type="range"] {
  width: 100%;
}
.label-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.label-row > label,
.label-row > span {
  font-weight: 600;
}
.label-row label {
  margin: 0;
}
.help-button {
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 50%;
  color: var(--accent);
  font-weight: 700;
  line-height: 1;
}
.help-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.help-panel {
  margin: 12px 0 16px;
  padding: 12px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  color: var(--muted);
}
.checkbox-row {
  margin: 12px 0;
}
.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  cursor: pointer;
}
button:hover:not(:disabled) {
  border-color: var(--accent);
}
button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
.preview-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.preview-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}
.preview-label {
  margin-bottom: 8px;
  font-weight: 600;
}
.preview-box {
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed var(--border);
  border-radius: 10px;
  overflow: hidden;
  background-image:
    linear-gradient(45deg, rgba(0,0,0,0.05) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0,0,0,0.05) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0,0,0,0.05) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0,0,0,0.05) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}
.preview-box img {
  max-width: 100%;
  max-height: 110px;
}
.preview-box.empty {
  color: var(--muted);
}
.code-output {
  width: 100%;
  min-height: 180px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: inherit;
  resize: vertical;
}
.inline-actions {
  margin-top: 10px;
}
.file-list {
  margin: 0;
  padding-left: 20px;
}
.file-list li { margin: 6px 0; }
.status {
  min-height: 24px;
  color: var(--muted);
}
.status.error { color: #c62828; }
.status.success { color: #2e7d32; }
@media (max-width: 860px) {
  .grid-2,
  .preview-wrap {
    grid-template-columns: 1fr;
  }
}