.image-splitter-tool {
      --space-xs: 4px;
      --space-sm: 8px;
      --space-md: 12px;
      --space-lg: 16px;
      --space-xl: 24px;
      --space-2xl: 32px;
      --space-3xl: 48px;
      --gray-50: #fbfbfb;
      --gray-100: #f7f7f7;
      --gray-150: #f2f2f2;
      --gray-200: #eeeeee;
      --gray-300: #dddddd;
      --gray-400: #bbbbbb;
      --gray-500: #999999;
      --gray-600: #666666;
      --gray-700: #444444;
      --gray-800: #222222;
      --gray-900: #111111;
      --bg-canvas: #ffffff;
      --bg-module: #f7f7f7;
      --bg-hover: #eeeeee;
      --bg-hover-subtle: #f2f2f2;
      --bg-active: #111111;
      --text-primary: #111111;
      --text-secondary: #444444;
      --text-tertiary: #666666;
      --text-placeholder: #999999;
      --text-on-dark: #ffffff;
      --border: #dddddd;
      --border-strong: #222222;
      --success: #276749;
      --danger: #a12424;
      --accent: #2563eb;
      --radius-sm: 4px;
      --radius: 6px;
      --radius-round: 999px;
      --font-sans: "Noto Sans SC", system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-mono: "Noto Sans Mono", "SFMono-Regular", Consolas, monospace;
      box-sizing: border-box;
      width: 100%;
      max-width: none;
      overflow-x: clip;
      container-type: inline-size;
      min-height: 100vh;
      padding: 24px 30px 48px;
      color: var(--text-primary);
      background: var(--bg-canvas);
      font: 15px/1.7 var(--font-sans);
    }

    .inline-tool-content.image-splitter-tool {
      width: 100%;
      max-width: none;
      min-width: 0;
    }

    .inline-tool-content.image-splitter-tool > .image-splitter-tool {
      min-height: 0;
      padding: 0;
      overflow-x: visible;
    }

    .image-splitter-tool [hidden] { display: none !important; }

    .image-splitter-tool *,
    .image-splitter-tool *::before,
    .image-splitter-tool *::after { box-sizing: border-box; }

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

    .image-splitter-tool button,
    .image-splitter-tool input,
    .image-splitter-tool select,
    .image-splitter-tool summary,
    .image-splitter-tool a { outline: none; }

    .image-splitter-tool :focus-visible {
      outline: 2px solid var(--border-strong);
      outline-offset: 2px;
    }

    .image-splitter-tool .tool-header {
      padding: 0 0 16px;
      border-bottom: 1px solid var(--border);
    }

    .image-splitter-tool .tool-header h1 {
      margin: 0;
      font-size: 30px;
      line-height: 1.2;
      letter-spacing: 0;
      font-weight: 800;
    }

    .image-splitter-tool .tool-header p {
      max-width: 78ch;
      margin: 4px 0 0;
      color: var(--text-tertiary);
    }

    .image-splitter-tool .tool-main { padding-top: 24px; }

    .image-splitter-tool .card-block {
      margin-bottom: 16px;
      padding: 16px 24px;
      background: var(--bg-module);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .image-splitter-tool .card-inner {
      padding: 12px 14px;
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .image-splitter-tool h2 {
      margin: 32px 0 16px;
      padding-left: 12px;
      border-left: 3px solid var(--gray-900);
      font-size: 24px;
      line-height: 1.3;
    }

    .image-splitter-tool h3 {
      margin: 0 0 12px;
      font-size: 18px;
      line-height: 1.4;
    }

    .image-splitter-tool .drop-zone {
      display: grid;
      place-items: center;
      min-height: 220px;
      padding: 28px;
      text-align: center;
      background: var(--bg-canvas);
      border: 1px dashed var(--gray-400);
      border-radius: var(--radius);
      transition: border-color .15s ease, background .15s ease;
    }

    .image-splitter-tool .drop-zone.is-dragover {
      border-color: var(--gray-900);
      background: var(--gray-50);
    }

    .image-splitter-tool .drop-icon {
      display: grid;
      place-items: center;
      width: 56px;
      height: 56px;
      margin: 0 auto 12px;
      border: 1px solid var(--border-strong);
      border-radius: var(--radius-round);
      font-size: 24px;
      font-weight: 700;
    }

    .image-splitter-tool .drop-zone strong { display: block; font-size: 18px; }
    .image-splitter-tool .drop-zone p { margin: 4px 0 16px; color: var(--text-tertiary); }

    .image-splitter-tool .action-row,
    .image-splitter-tool .toolbar-row,
    .image-splitter-tool .output-actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 8px;
    }

    .image-splitter-tool .btn {
      min-height: 40px;
      min-width: 80px;
      padding: 0 16px;
      color: var(--text-primary);
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      font-size: 14px;
      font-weight: 700;
      cursor: pointer;
      white-space: nowrap;
    }

    .image-splitter-tool .btn:hover { background: var(--bg-hover); border-color: var(--gray-400); }
    .image-splitter-tool .btn:active { transform: translateY(1px); }
    .image-splitter-tool .btn:disabled { color: var(--gray-500); background: var(--gray-200); cursor: not-allowed; transform: none; }

    .image-splitter-tool .btn-primary {
      color: var(--text-on-dark);
      background: var(--bg-active);
      border-color: var(--bg-active);
    }

    .image-splitter-tool .btn-primary:hover { background: var(--gray-800); }
    .image-splitter-tool .btn-danger { color: var(--danger); }
    .image-splitter-tool .btn-small { min-height: 34px; min-width: 0; padding: 0 12px; font-size: 13px; }

    .image-splitter-tool .visually-hidden {
      position: absolute !important;
      width: 1px !important;
      height: 1px !important;
      padding: 0 !important;
      margin: -1px !important;
      overflow: hidden !important;
      clip: rect(0, 0, 0, 0) !important;
      white-space: nowrap !important;
      border: 0 !important;
    }

    .image-splitter-tool .accepted-types {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      margin-top: 16px;
    }

    .image-splitter-tool .chip {
      display: inline-flex;
      align-items: center;
      min-height: 28px;
      padding: 0 10px;
      color: var(--text-secondary);
      background: var(--gray-100);
      border: 1px solid var(--border);
      border-radius: var(--radius-round);
      font-size: 12px;
      font-weight: 700;
    }

    .image-splitter-tool .app-shell {
      display: block;
      min-width: 0;
    }

    .image-splitter-tool .app-shell[hidden] { display: none; }

    .image-splitter-tool .file-bar {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 12px;
      align-items: center;
      margin-bottom: 16px;
      min-width: 0;
    }

    .image-splitter-tool .file-list {
      display: flex;
      gap: 8px;
      min-width: 0;
      overflow-x: auto;
      padding: 2px;
      scrollbar-width: thin;
    }

    .image-splitter-tool .file-tab {
      display: grid;
      grid-template-columns: 42px minmax(100px, 180px);
      gap: 8px;
      align-items: center;
      flex: 0 0 auto;
      min-height: 52px;
      padding: 5px 8px 5px 5px;
      text-align: left;
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      cursor: pointer;
    }

    .image-splitter-tool .file-tab.is-active { border-color: var(--gray-900); background: var(--gray-50); }
    .image-splitter-tool .file-tab img { width: 42px; height: 42px; object-fit: cover; border-radius: var(--radius-sm); background: var(--gray-200); }
    .image-splitter-tool .file-tab-name { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 700; }
    .image-splitter-tool .file-tab-meta { display: block; color: var(--text-tertiary); font: 12px/1.4 var(--font-mono); }

    .image-splitter-tool .mode-tabs {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 8px;
      margin-bottom: 16px;
      padding: 6px;
      background: var(--bg-module);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .image-splitter-tool .mode-tab {
      min-height: 44px;
      padding: 8px 12px;
      color: var(--text-secondary);
      background: transparent;
      border: 0;
      border-radius: var(--radius-sm);
      font-weight: 700;
      cursor: pointer;
    }

    .image-splitter-tool .mode-tab:hover { background: var(--bg-hover); }
    .image-splitter-tool .mode-tab.is-active { color: var(--text-on-dark); background: var(--bg-active); }

    .image-splitter-tool .editor-grid {
      display: grid;
      grid-template-columns: minmax(300px, 1fr) 280px;
      gap: 16px;
      align-items: start;
      min-width: 0;
    }

    .image-splitter-tool .canvas-panel { min-width: 0; }

    .image-splitter-tool .canvas-toolbar {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }

    .image-splitter-tool .image-meta { color: var(--text-tertiary); font: 13px/1.4 var(--font-mono); }

    .image-splitter-tool .canvas-stage {
      position: relative;
      min-height: 560px;
      overflow: hidden;
      background:
        linear-gradient(45deg, var(--gray-150) 25%, transparent 25%),
        linear-gradient(-45deg, var(--gray-150) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--gray-150) 75%),
        linear-gradient(-45deg, transparent 75%, var(--gray-150) 75%);
      background-size: 20px 20px;
      background-position: 0 0, 0 10px, 10px -10px, -10px 0;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      touch-action: none;
      user-select: none;
    }

    .image-splitter-tool #editorCanvas { display: block; width: 100%; height: 560px; cursor: crosshair; }

    .image-splitter-tool .canvas-help {
      position: absolute;
      left: 10px;
      bottom: 10px;
      max-width: calc(100% - 20px);
      padding: 5px 8px;
      color: rgba(255,255,255,.88);
      background: rgba(17,17,17,.78);
      border-radius: var(--radius-sm);
      font-size: 12px;
      pointer-events: none;
    }

    .image-splitter-tool .settings-panel {
      position: sticky;
      top: 16px;
      min-width: 0;
      padding: 16px;
      background: var(--bg-module);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .image-splitter-tool .settings-section + .settings-section {
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border);
    }

    .image-splitter-tool .settings-section[hidden] { display: none; }

    .image-splitter-tool .field-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 10px;
    }

    .image-splitter-tool .field { display: grid; gap: 4px; min-width: 0; }
    .image-splitter-tool .field.full { grid-column: 1 / -1; }
    .image-splitter-tool .field label, .image-splitter-tool .group-label { color: var(--text-secondary); font-size: 13px; font-weight: 700; }

    .image-splitter-tool .input-base,
    .image-splitter-tool .select-base {
      width: 100%;
      height: 42px;
      padding: 0 10px;
      color: var(--text-primary);
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .image-splitter-tool .input-base[type="number"] { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
    .image-splitter-tool .input-base:focus, .image-splitter-tool .select-base:focus { border-color: var(--border-strong); }
    .image-splitter-tool .input-base[aria-invalid="true"] { border-color: var(--danger); }

    .image-splitter-tool .range-row {
      display: grid;
      grid-template-columns: 1fr 52px;
      gap: 8px;
      align-items: center;
    }

    .image-splitter-tool .range-row output { text-align: right; font: 13px/1 var(--font-mono); }

    .image-splitter-tool .segmented {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 6px;
    }

    .image-splitter-tool .segmented button {
      min-height: 38px;
      padding: 0 8px;
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
    }

    .image-splitter-tool .segmented button[aria-pressed="true"] { color: var(--text-on-dark); background: var(--gray-900); border-color: var(--gray-900); }

    .image-splitter-tool .summary-box {
      margin-top: 12px;
      padding: 10px 12px;
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .image-splitter-tool .summary-box dl { display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; margin: 0; }
    .image-splitter-tool .summary-box dt { color: var(--text-tertiary); }
    .image-splitter-tool .summary-box dd { margin: 0; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

    .image-splitter-tool .status-line {
      min-height: 24px;
      margin-top: 10px;
      color: var(--text-tertiary);
      font-size: 13px;
    }

    .image-splitter-tool .status-line.is-error { color: var(--danger); }
    .image-splitter-tool .status-line.is-success { color: var(--success); }

    .image-splitter-tool .result-header {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 12px;
      align-items: center;
      margin-bottom: 12px;
    }

    .image-splitter-tool .result-summary { color: var(--text-secondary); }
    .image-splitter-tool .result-summary strong { color: var(--text-primary); font-family: var(--font-mono); }

    .image-splitter-tool .result-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
      gap: 12px;
    }

    .image-splitter-tool .result-item {
      min-width: 0;
      overflow: hidden;
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .image-splitter-tool .result-thumb {
      display: grid;
      place-items: center;
      height: 138px;
      padding: 8px;
      background: var(--gray-100);
      border-bottom: 1px solid var(--border);
    }

    .image-splitter-tool .result-thumb img { max-width: 100%; max-height: 100%; object-fit: contain; }
    .image-splitter-tool .result-body { padding: 10px; }
    .image-splitter-tool .result-name { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; font-weight: 700; }
    .image-splitter-tool .result-meta { display: block; margin: 2px 0 8px; color: var(--text-tertiary); font: 12px/1.4 var(--font-mono); }
    .image-splitter-tool .result-download { display: inline-flex; align-items: center; min-height: 34px; padding: 0 12px; color: var(--text-primary); text-decoration: none; background: var(--bg-canvas); border: 1px solid var(--border); border-radius: var(--radius); font-size: 13px; font-weight: 700; }
    .image-splitter-tool .result-download:hover { background: var(--bg-hover); }

    .image-splitter-tool .empty-result {
      padding: 32px;
      text-align: center;
      color: var(--text-tertiary);
      background: var(--bg-canvas);
      border: 1px dashed var(--gray-400);
      border-radius: var(--radius);
    }


    .image-splitter-tool .upload-status { margin: 10px 0 0; text-align: center; }

    .image-splitter-tool .case-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
    }

    .image-splitter-tool .case-card {
      display: grid;
      grid-template-rows: auto auto 1fr;
      gap: 12px;
      min-width: 0;
      padding: 16px;
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius);
    }

    .image-splitter-tool .case-card h3 { margin: 0; }
    .image-splitter-tool .case-task { margin: 0; color: var(--text-secondary); }

    .image-splitter-tool .case-flow {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr);
      gap: 8px;
      align-items: center;
    }

    .image-splitter-tool .case-stage {
      min-width: 0;
      padding: 10px;
      background: var(--gray-50);
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
    }

    .image-splitter-tool .case-stage-label {
      display: block;
      margin-bottom: 6px;
      color: var(--text-tertiary);
      font-size: 12px;
      font-weight: 700;
    }

    .image-splitter-tool .case-arrow { text-align: center; color: var(--text-tertiary); font-size: 18px; font-weight: 700; }
    .image-splitter-tool .case-stage svg { display: block; width: 100%; height: 116px; }

    .image-splitter-tool .case-process {
      margin: 0;
      padding: 10px 12px;
      background: var(--gray-50);
      border-left: 3px solid var(--gray-900);
      font-size: 14px;
    }

    .image-splitter-tool .case-process strong { display: inline-block; margin-right: 6px; }

    .image-splitter-tool .how-grid {
      display: grid;
      grid-template-columns: repeat(5, minmax(0, 1fr));
      gap: 12px;
      margin: 0;
      padding: 0;
      list-style: none;
      counter-reset: how-step;
    }

    .image-splitter-tool .how-step {
      position: relative;
      min-width: 0;
      padding: 16px 14px;
      background: var(--bg-canvas);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      counter-increment: how-step;
    }

    .image-splitter-tool .how-step::before {
      content: counter(how-step);
      display: grid;
      place-items: center;
      width: 28px;
      height: 28px;
      margin-bottom: 10px;
      color: var(--text-on-dark);
      background: var(--gray-900);
      border-radius: var(--radius-round);
      font-family: var(--font-mono);
      font-size: 13px;
      font-weight: 700;
    }

    .image-splitter-tool .how-step strong { display: block; margin-bottom: 4px; font-size: 15px; }
    .image-splitter-tool .how-step p { margin: 0; color: var(--text-secondary); font-size: 13px; }

    .image-splitter-tool details.acc { background: var(--bg-canvas); border: 1px solid var(--border); border-radius: var(--radius); }
    .image-splitter-tool details.acc + details.acc { margin-top: 8px; }
    .image-splitter-tool details.acc summary {
      display: flex;
      align-items: center;
      min-height: 48px;
      padding: 0 14px;
      list-style: none;
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
    }
    .image-splitter-tool details.acc summary::-webkit-details-marker { display: none; }
    .image-splitter-tool details.acc summary::after { content: "+"; margin-left: auto; color: var(--text-tertiary); font-size: 20px; }
    .image-splitter-tool details.acc[open] summary { margin-bottom: 12px; border-bottom: 1px solid var(--border); }
    .image-splitter-tool details.acc[open] summary::after { content: "−"; }
    .image-splitter-tool .acc-panel { padding: 0 14px 14px; }
    .image-splitter-tool .acc-panel p { margin: 0 0 10px; }
    .image-splitter-tool .acc-panel p:last-child { margin-bottom: 0; }
    .image-splitter-tool .acc-panel ul { margin: 0; padding-left: 20px; }

    .image-splitter-tool .toast {
      position: fixed;
      left: 50%;
      bottom: 24px;
      z-index: 999;
      transform: translateX(-50%) translateY(16px);
      max-width: min(90vw, 520px);
      padding: 9px 14px;
      color: #fff;
      background: #111;
      border-radius: var(--radius);
      opacity: 0;
      pointer-events: none;
      transition: opacity .15s ease, transform .15s ease;
    }

    .image-splitter-tool .toast.is-visible { opacity: 1; transform: translateX(-50%) translateY(0); }

    @container (max-width: 600px) {
      .image-splitter-tool .editor-grid { grid-template-columns: minmax(0, 1fr); }
      .image-splitter-tool .settings-panel { position: static; }
    }

    @media (max-width: 700px) {
      .image-splitter-tool .editor-grid { grid-template-columns: minmax(0, 1fr); }
      .image-splitter-tool .settings-panel { position: static; }
    }

    @media (max-width: 720px) {
      .image-splitter-tool { padding: 16px 8px 32px; }
      .image-splitter-tool .card-block { padding: 14px; }
      .image-splitter-tool .file-bar { grid-template-columns: 1fr; }
      .image-splitter-tool .file-bar > .action-row { align-items: stretch; }
      .image-splitter-tool .mode-tabs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .image-splitter-tool .field-grid { grid-template-columns: 1fr; }
      .image-splitter-tool .field.full { grid-column: auto; }
      .image-splitter-tool .case-grid { grid-template-columns: 1fr; }
      .image-splitter-tool .how-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .image-splitter-tool #editorCanvas { height: 460px; }
      .image-splitter-tool .canvas-stage { min-height: 460px; }
    }

    @media (max-width: 430px) {
      .image-splitter-tool .action-row .btn,
      .image-splitter-tool .output-actions .btn { flex: 1 1 100%; }
      .image-splitter-tool .mode-tabs { gap: 4px; padding: 4px; }
      .image-splitter-tool .mode-tab { padding: 6px; font-size: 13px; }
      .image-splitter-tool .case-flow { grid-template-columns: 1fr; }
      .image-splitter-tool .case-arrow { transform: rotate(90deg); }
      .image-splitter-tool .how-grid { grid-template-columns: 1fr; }
      .image-splitter-tool #editorCanvas { height: 400px; }
      .image-splitter-tool .canvas-stage { min-height: 400px; }
    }

    @media (prefers-reduced-motion: reduce) {
      .image-splitter-tool *,
      .image-splitter-tool *::before,
      .image-splitter-tool *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
      }
    }

.image-splitter-tool .tool-title { margin: 0; font-size: 30px; line-height: 1.2; letter-spacing: 0; font-weight: 800; padding-left: 0; border-left: 0; }