.artboard.is-empty:not(.has-source)::after {
  content: "导入 JPG 或 PNG 后，点击“生成线稿”";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 3;
  color: #8c7058;
  font-size: 14px;
  letter-spacing: 0;
  background: repeating-linear-gradient(0deg, rgba(255, 250, 241, 0.88) 0 23px, rgba(220, 198, 165, 0.22) 24px);
}

.topbar[hidden] {
  display: none !important;
}

.artboard.is-empty:not(.has-source) img,
.artboard.is-empty.has-source .art-line {
  opacity: 0;
}

.canvas-footer.lineart-actions {
  justify-content: flex-end;
  min-height: 62px;
}

.lineart-generate-button:disabled {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--muted);
  opacity: 1;
}

/* Empty image elements otherwise expose their alt text as a broken thumbnail. */
#sourceThumb:not([src]),
#uploadedPreview:not([src]),
.artboard img:not([src]) {
  display: none;
}

.file-chip:has(#sourceThumb:not([src])) {
  grid-template-columns: minmax(0, 1fr);
}

.real-fill-canvas {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  touch-action: none;
  cursor: crosshair;
}

.paint-stage.real-fill-ready .region-fill,
.paint-stage.real-fill-ready .region-hit {
  display: none;
}

.paint-stage.real-fill-ready[data-canvas-view="fill"] .paint-color-image,
.paint-stage.real-fill-ready[data-canvas-view="fill"] .paint-line-image {
  opacity: 0;
}

.paint-stage.real-fill-ready:not([data-canvas-view="fill"]) .real-fill-canvas {
  display: none;
}

.paint-stage.real-fill-ready.is-reference-mode .real-fill-canvas {
  cursor: not-allowed;
}

.paint-stage.real-fill-ready.is-canvas-eyedropper .real-fill-canvas {
  cursor: crosshair;
}

.paint-stage.real-fill-ready.is-eraser-active .real-fill-canvas {
  cursor: crosshair;
}

.generation-record.server-record {
  grid-template-columns: 46px minmax(0, 1fr) auto auto;
}

.generation-record-delete {
  width: 23px;
  height: 23px;
  padding: 0;
  border: 0;
  background: transparent;
  color: #92796a;
  font-size: 16px;
  line-height: 1;
}

.generation-record-delete:hover {
  color: #9f2f26;
}

.generation-record[data-busy="true"] {
  opacity: 0.58;
  pointer-events: none;
}

@media (max-width: 1300px) {
  .generation-record.server-record { grid-template-columns: 42px minmax(0, 1fr) auto; }
  .generation-record.server-record .generation-record-delete { display: none; }
}

html,
body {
  overflow-x: hidden;
}

@media (max-width: 1024px) {
  .app-shell {
    width: calc(100% - 32px);
    padding: 24px 0 36px;
  }

  .page-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .prototype-note {
    white-space: normal;
  }

  .stepper {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .step-item:nth-child(2) {
    border-right: 0;
  }

  .step-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .tool-heading {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .lineart-layout,
  .color-layout {
    grid-template-columns: minmax(0, 1fr);
    min-height: 0;
  }

  .lineart-layout > * + *,
  .color-layout > * + * {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .upload-zone {
    display: grid;
    grid-template-columns: minmax(220px, 0.8fr) minmax(260px, 1.2fr);
    gap: 0 20px;
  }

  .upload-zone .side-label,
  .upload-zone .upload-box {
    grid-column: 1;
  }

  .upload-zone .file-chip,
  .upload-zone .status-list,
  .upload-zone .generation-history {
    grid-column: 2;
  }

  .upload-zone .file-chip {
    grid-row: 1 / span 2;
    align-self: start;
  }

  .upload-zone .status-list {
    grid-row: 2;
    align-self: end;
  }

  .upload-zone .generation-history {
    grid-row: 3 / span 2;
    margin-top: 0;
  }

  .artboard {
    min-height: 480px;
  }

  .paint-workspace {
    order: 1;
  }

  .palette-panel {
    order: 2;
  }

  .inspector-panel {
    order: 3;
  }

  .palette-panel,
  .inspector-panel {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-content: start;
    gap: 0 22px;
  }

  .palette-panel > *,
  .inspector-panel > * {
    min-width: 0;
  }

  .palette-panel .panel-head,
  .palette-panel .palette-section:first-of-type,
  .palette-panel .palette-divider,
  .palette-panel .mode-tabs,
  .inspector-panel .ai-trigger {
    grid-column: 1 / -1;
  }

  .palette-panel .solution-history,
  .inspector-panel .ai-box {
    grid-column: 2;
    grid-row: span 4;
    margin-top: 0;
  }

  .inspector-panel .manual-color-controls {
    grid-column: 1;
  }

  .paint-stage {
    min-height: 520px;
  }
}

@media (max-width: 700px) {
  .app-shell {
    width: calc(100% - 20px);
    padding-top: 18px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 22px;
  }

  .page-heading {
    margin-bottom: 18px;
  }

  .step-item {
    gap: 8px;
    padding: 11px 10px;
  }

  .step-number {
    width: 27px;
    height: 27px;
    font-size: 14px;
  }

  .step-title {
    font-size: 14px;
  }

  .step-desc {
    display: none;
  }

  .tool-heading,
  .canvas-toolbar,
  .paint-toolbar,
  .paint-footer,
  .form-intro,
  .form-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .heading-actions,
  .toolbar-group,
  .paint-footer-actions {
    flex-wrap: wrap;
  }

  .heading-actions .button,
  .form-actions .button {
    flex: 1;
  }

  .upload-zone,
  .palette-panel,
  .inspector-panel,
  .form-columns,
  .field-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }

  .upload-zone > *,
  .palette-panel > *,
  .inspector-panel > *,
  .palette-panel .solution-history,
  .inspector-panel .manual-color-controls,
  .inspector-panel .ai-box,
  .inspector-panel .ai-trigger {
    grid-column: 1;
    grid-row: auto;
  }

  .upload-zone .side-label,
  .upload-zone .upload-box,
  .upload-zone .file-chip,
  .upload-zone .status-list,
  .upload-zone .generation-history {
    grid-column: 1;
    grid-row: auto;
  }

  .upload-zone .generation-history,
  .palette-panel .solution-history,
  .inspector-panel .ai-box {
    margin-top: 18px;
  }

  .artboard,
  .paint-stage {
    min-height: 390px;
  }

  .canvas-view-switch {
    max-width: 100%;
    overflow-x: auto;
  }

  .metric-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .form-shell {
    padding: 18px;
  }

  .form-section + .form-section {
    padding-top: 22px;
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .form-actions p {
    order: -1;
  }

  .merchant-shell {
    margin-top: 20px;
    padding: 34px 18px;
  }

  .merchant-title {
    font-size: 29px;
  }

  .merchant-intro {
    font-size: 15px;
  }

  .merchant-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 10px;
  }

  .toast {
    right: 12px;
    bottom: 12px;
    left: 12px;
    max-width: none;
  }
}