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

:root {
  --page-bg: #f5f5f5;
  --panel-bg: #fff;
  --border: #ddd;
  --border-focus: #1677ff;
  --text: #333;
  --text-secondary: #666;
  --text-placeholder: #999;
  --preview-bg: #fafafa;
  --primary: #1677ff;
  --primary-hover: #4096ff;
  --radius: 4px;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--page-bg);
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 32px;
}

.page-header {
  margin-bottom: 16px;
}

.page-title {
  margin: 0 0 4px;
  font-size: 20px;
  font-weight: 600;
}

.page-desc {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.block {
  margin-bottom: 20px;
}

.block-label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
}

.dropzone {
  padding: 28px 16px;
  text-align: center;
  background: #fff;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  user-select: none;
}

.dropzone:focus {
  outline: none;
  border-color: var(--border-focus);
}

.dropzone.is-dragover {
  border-color: var(--border-focus);
  background: #f0f7ff;
}

.dropzone-text {
  margin: 0 0 4px;
  font-size: 14px;
  color: var(--text);
}

.dropzone-hint {
  margin: 0;
  font-size: 13px;
  color: var(--text-placeholder);
}

.params-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 16px;
}

.field-label {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  color: var(--text-secondary);
}

.field-control {
  width: 100%;
  padding: 6px 8px;
  font: inherit;
  font-size: 14px;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.field-control:focus {
  outline: none;
  border-color: var(--border-focus);
}

.field-control::placeholder {
  color: var(--text-placeholder);
}

.format-note {
  margin: 10px 0 0;
  padding: 8px 10px;
  font-size: 13px;
  color: var(--text-secondary);
  background: #fafafa;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.format-note[hidden] {
  display: none;
}

.info-panel[hidden] {
  display: none;
}

.info-list {
  margin: 0;
  padding: 12px 14px;
  background: #fafafa;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.info-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-bottom: 6px;
}

.info-row:last-child {
  margin-bottom: 0;
}

.info-row dt {
  margin: 0;
  min-width: 88px;
  font-weight: normal;
  color: var(--text-secondary);
}

.info-row dd {
  margin: 0;
  flex: 1;
  word-break: break-all;
}

.compare-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.compare-label {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--text-secondary);
}

.preview-box {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  padding: 12px;
  background: var(--preview-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.preview-placeholder {
  margin: 0;
  font-size: 14px;
  color: var(--text-placeholder);
  text-align: center;
}

.preview-placeholder[hidden],
.preview-img[hidden] {
  display: none;
}

.preview-img {
  display: block;
  max-width: 100%;
  max-height: 320px;
  width: auto;
  height: auto;
}

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

.btn {
  padding: 6px 14px;
  font: inherit;
  font-size: 14px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  background: #fff;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  color: #fff;
  background: var(--primary);
  border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn-default {
  color: var(--text);
  border-color: var(--border);
}

.btn-default:hover:not(:disabled) {
  color: var(--primary);
  border-color: var(--primary);
}

.hint {
  margin: 12px 0 0;
  padding: 8px 10px;
  font-size: 13px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.hint--info {
  color: #0958d9;
  background: #e6f4ff;
  border-color: #91caff;
}

.hint--warn {
  color: #ad6800;
  background: #fffbe6;
  border-color: #ffe58f;
}

.hint--error {
  color: #cf1322;
  background: #fff2f0;
  border-color: #ffccc7;
}

.hint--success {
  color: #389e0d;
  background: #f6ffed;
  border-color: #b7eb8f;
}

.hint[hidden] {
  display: none;
}

@media (max-width: 720px) {
  .params-grid {
    grid-template-columns: 1fr;
  }

  .compare-preview {
    grid-template-columns: 1fr;
  }

  .preview-box {
    min-height: 160px;
  }
}