:root {
      --bg: #f7f7f7;
      --panel: #ffffff;
      --text: #222222;
      --muted: #666666;
      --line: #d3d3d3;
      --line-strong: #999999;
      --accent: #1558b0;
      --accent-soft: #eef5ff;
      --danger: #a1261d;
      --radius: 4px;
    }

    * {
      box-sizing: border-box;
    }

    html,
    body {
      min-height: 100%;
    }

    body {
      margin: 0;
      overflow-x: hidden;
      font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", "Yu Gothic UI",
        "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
      color: var(--text);
      background: var(--bg);
      line-height: 1.7;
    }

    button,
    input,
    select {
      font: inherit;
    }

    button {
      cursor: pointer;
    }

    button:disabled {
      cursor: not-allowed;
      opacity: .45;
    }

    .app {
      width: min(1280px, 100%);
      margin: 0 auto;
      padding: 20px;
    }

    .header {
      display: flex;
      align-items: flex-end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 14px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--line);
    }

    .site-name {
      margin: 0 0 2px;
      color: var(--muted);
      font-size: 13px;
      font-weight: 700;
    }

    .brand h1 {
      margin: 0;
      font-size: clamp(24px, 3vw, 34px);
      letter-spacing: -.02em;
    }

    .brand p {
      margin: 7px 0 0;
      color: var(--muted);
      font-size: 14px;
    }

    .privacy-badge {
      flex: 0 0 auto;
      padding: 8px 11px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
      color: #4e5359;
      font-size: 12px;
      white-space: nowrap;
    }

    .drop-zone {
      min-height: 310px;
      display: grid;
      place-items: center;
      padding: 28px;
      border: 2px dashed var(--line-strong);
      border-radius: var(--radius);
      background: var(--panel);
      transition: border-color .15s ease, background .15s ease;
    }

    .drop-zone.is-dragover {
      border-color: var(--accent);
      background: var(--accent-soft);
    }

    .drop-zone[hidden] {
      display: none;
    }

    .drop-inner {
      max-width: 620px;
      text-align: center;
    }

    .paste-key {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 18px;
      color: var(--muted);
      font-size: 13px;
    }

    kbd {
      min-width: 34px;
      padding: 5px 8px;
      border: 1px solid #c7cbd1;
      border-bottom-width: 3px;
      border-radius: 3px;
      background: #fafafa;
      color: #25282c;
      font: 600 12px/1 system-ui, sans-serif;
    }

    .drop-title {
      margin: 0;
      font-size: clamp(23px, 4vw, 38px);
      letter-spacing: -.02em;
    }

    .drop-subtitle {
      margin: 12px 0 22px;
      color: var(--muted);
      line-height: 1.75;
    }

    .file-button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 0 16px;
      border: 1px solid var(--line-strong);
      border-radius: 3px;
      background: #fff;
      color: var(--text);
      font-weight: 650;
    }

    .file-button:hover {
      background: #f7f8fa;
    }

    .editor[hidden] {
      display: none;
    }

    .editor-controls {
      position: sticky;
      top: 8px;
      z-index: 30;
      padding-bottom: 8px;
      background: var(--bg);
    }

    .editor-controls .toolbar + .toolbar {
      margin-top: 4px;
    }

    .image-operation-toolbar {
      margin-top: 8px;
    }

    .toolbar {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      padding: 10px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: var(--panel);
    }

    .toolbar + .toolbar {
      margin-top: 8px;
    }

    .toolbar-spacer {
      flex: 1 1 auto;
    }

    .toolbar > label {
      color: var(--muted);
      font-size: 12px;
      white-space: nowrap;
    }

    .tool-group {
      display: inline-flex;
      gap: 4px;
      padding: 3px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #f5f5f5;
    }

    .toolbar button,
    .toolbar select {
      min-height: 36px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
      color: var(--text);
    }

    .toolbar button {
      padding: 0 11px;
      font-weight: 620;
    }

    .toolbar button:hover:not(:disabled) {
      background: #f7f8fa;
    }

    .tool-group button {
      border-color: transparent;
      background: transparent;
      font-weight: 620;
    }

    .tool-group button.is-active {
      border-color: #c8d9f6;
      background: #fff;
      color: var(--accent);
    }

    .primary-button {
      border-color: var(--accent) !important;
      background: var(--accent) !important;
      color: #fff !important;
    }

    .primary-button:hover:not(:disabled) {
      filter: brightness(.96);
    }

    .danger-button {
      color: var(--danger) !important;
    }

    .strength-control {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 36px;
      padding: 0 10px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
    }

    .strength-control[hidden],
    .selection-control[hidden],
    .annotation-controls label[hidden] {
      display: none;
    }

    .selection-control {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      min-height: 36px;
      padding: 3px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
    }

    .selection-control > span {
      padding: 0 5px;
      color: var(--muted);
      font-size: 12px;
      white-space: nowrap;
    }

    .selection-control .selection-mode-button {
      min-height: 28px;
      padding: 0 9px;
      border-color: transparent;
      background: transparent;
      font-size: 12px;
    }

    .selection-control .selection-mode-button.is-active {
      border-color: #c8d9f6;
      background: #eef4ff;
      color: var(--accent);
    }

    .strength-control label {
      color: var(--muted);
      font-size: 12px;
      white-space: nowrap;
    }

    .strength-control input[type="range"] {
      width: 110px;
      accent-color: var(--accent);
    }

    .strength-value {
      min-width: 42px;
      font-variant-numeric: tabular-nums;
      font-size: 12px;
      font-weight: 700;
      text-align: right;
    }

    .image-meta {
      color: var(--text);
      font-size: 13px;
      font-weight: 700;
      font-variant-numeric: tabular-nums;
      white-space: nowrap;
    }

    .output-file-size {
      color: var(--muted);
      font-size: 12px;
      font-variant-numeric: tabular-nums;
      white-space: nowrap;
    }

    .auto-copy-control {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      min-height: 36px;
      padding: 0 9px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
      color: var(--text) !important;
      font-weight: 700;
      cursor: pointer;
    }

    .auto-copy-control:has(input:disabled) {
      color: var(--muted) !important;
      cursor: not-allowed;
    }

    .auto-copy-control input {
      margin: 0;
      accent-color: var(--accent);
    }

    .metadata-panel,
    .safety-check {
      margin-top: 8px;
      padding: 10px 12px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
      font-size: 13px;
    }

    .metadata-panel[hidden],
    .safety-check[hidden] {
      display: none;
    }

    .metadata-heading,
    .safety-heading {
      display: flex;
      align-items: baseline;
      gap: 10px;
      flex-wrap: wrap;
    }

    .metadata-summary {
      color: var(--muted);
      font-weight: 700;
    }

    .metadata-summary.has-warning,
    .safety-check.has-warning {
      color: var(--danger);
    }

    .metadata-details {
      display: flex;
      gap: 7px 18px;
      flex-wrap: wrap;
      margin: 7px 0 0;
    }

    .metadata-details div {
      display: flex;
      gap: 5px;
    }

    .metadata-details dt {
      color: var(--muted);
    }

    .metadata-details dd {
      margin: 0;
      font-weight: 700;
      overflow-wrap: anywhere;
    }

    .metadata-output-note {
      margin: 7px 0 0;
      padding-top: 7px;
      border-top: 1px solid var(--line);
    }

    .safety-items {
      display: flex;
      gap: 6px 16px;
      flex-wrap: wrap;
      margin-top: 6px;
    }

    .safety-item {
      font-weight: 700;
    }

    .safety-item.is-warning {
      color: var(--danger);
    }

    .annotation-controls[hidden] {
      display: none;
    }

    .annotation-controls {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      min-height: 36px;
      padding: 3px 8px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #f8f8f8;
    }

    .annotation-controls label {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      color: var(--muted);
      font-size: 12px;
      white-space: nowrap;
    }

    .annotation-controls input[type="text"] {
      width: min(260px, 42vw);
      min-height: 32px;
      padding: 0 8px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
      color: var(--text);
    }

    .annotation-controls input[type="number"] {
      width: 70px;
      min-height: 32px;
      padding: 0 6px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
      color: var(--text);
    }

    .annotation-controls input[type="color"] {
      width: 36px;
      height: 30px;
      padding: 2px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
    }

    .annotation-help {
      color: var(--muted);
      font-size: 11px;
      white-space: nowrap;
    }

    .resize-control {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      flex-wrap: wrap;
    }

    .resize-control > span,
    .resize-control label {
      color: var(--muted);
      font-size: 12px;
      white-space: nowrap;
    }

    .resize-control .resize-label {
      color: var(--text);
      font-weight: 700;
    }

    .resize-control input[type="number"] {
      width: 82px;
      min-height: 36px;
      margin: 0 3px;
      padding: 0 7px;
      border: 1px solid var(--line);
      border-radius: 3px;
      background: #fff;
      color: var(--text);
      font: inherit;
      font-variant-numeric: tabular-nums;
    }

    .resize-control .aspect-lock {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: var(--text);
    }

    .canvas-shell {
      position: relative;
      margin-top: 12px;
      overflow: auto;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      background:
        linear-gradient(45deg, #eceef1 25%, transparent 25%),
        linear-gradient(-45deg, #eceef1 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #eceef1 75%),
        linear-gradient(-45deg, transparent 75%, #eceef1 75%);
      background-size: 20px 20px;
      background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    }

    .crop-confirm[hidden] {
      display: none;
    }

    .crop-confirm {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
      margin-top: 8px;
      padding: 8px 10px;
      border: 1px solid #8aa66a;
      background: #f4faee;
      font-size: 13px;
    }

    .crop-confirm button {
      min-height: 34px;
      padding: 0 11px;
      border: 1px solid var(--line-strong);
      border-radius: 3px;
      background: #fff;
      color: var(--text);
    }

    .crop-confirm .apply-crop {
      border-color: #456f20;
      background: #456f20;
      color: #fff;
    }

    .canvas-stage {
      position: relative;
      width: 100%;
      min-height: 220px;
      display: grid;
      place-items: start center;
      padding: 14px;
    }

    .canvas-stack {
      position: relative;
      width: fit-content;
      line-height: 0;
      max-width: 100%;
      background-color: #fff;
      background-image:
        linear-gradient(45deg, #e2e5e8 25%, transparent 25%),
        linear-gradient(-45deg, #e2e5e8 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #e2e5e8 75%),
        linear-gradient(-45deg, transparent 75%, #e2e5e8 75%);
      background-position: 0 0, 0 8px, 8px -8px, -8px 0;
      background-size: 16px 16px;
    }

    #outputCanvas,
    #overlayCanvas {
      display: block;
      max-width: 100%;
      height: auto;
    }

    #outputCanvas {
      background: transparent;
      user-select: none;
      -webkit-user-select: none;
    }

    #overlayCanvas.touch-scroll {
      touch-action: pan-x pan-y pinch-zoom;
    }

    .touch-actions { display: none; }

    .mobile-save-dialog {
      width: min(440px, calc(100% - 24px));
      max-height: 85vh;
      overflow-y: auto;
      padding: 20px;
      border: 1px solid var(--line);
      border-radius: 12px;
      color: var(--text);
    }

    .mobile-save-dialog::backdrop { background: rgb(0 0 0 / 45%); }
    .mobile-save-dialog h2 { margin: 0; font-size: 20px; }

    .mobile-save-dialog button {
      display: block;
      width: 100%;
      min-height: 44px;
      margin-top: 12px;
      padding: 10px;
      border: 1px solid var(--line-strong);
      border-radius: 6px;
      background: #fff;
      color: var(--text);
      text-align: center;
    }

    .mobile-save-dialog #shareFileButton {
      border-color: var(--accent);
      background: var(--accent);
      color: #fff;
    }

    #mobileSavePreview {
      display: block;
      max-width: 100%;
      max-height: 30vh;
      margin: 16px auto 0;
      object-fit: contain;
      -webkit-touch-callout: default;
    }

    .mobile-save-dialog [hidden] { display: none !important; }

    @media (pointer: coarse), (max-width: 720px) {
      .app { padding-bottom: calc(110px + env(safe-area-inset-bottom)); }
      .editor-controls { position: static; }

      .touch-actions {
        position: fixed;
        inset: auto 0 0;
        z-index: 40;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
        gap: 4px 12px;
        padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
        border-top: 1px solid var(--line);
        background: #fff;
        box-shadow: 0 -2px 8px rgb(0 0 0 / 8%);
      }

      .touch-actions button {
        min-height: 44px;
        padding: 8px 14px;
        border: 1px solid var(--line);
        border-radius: 6px;
        background: #fff;
        color: var(--text);
      }

      .touch-actions button[aria-pressed="true"],
      #touchSaveButton {
        border-color: var(--accent);
        background: var(--accent);
        color: #fff;
      }

      #touchModeHelp {
        flex-basis: 100%;
        font-size: 12px;
        color: var(--muted);
      }
    }

    #overlayCanvas {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      cursor: crosshair;
      touch-action: none;
      user-select: none;
      -webkit-user-select: none;
    }

    .hint-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      margin-top: 10px;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.6;
    }

    .hint-row strong {
      color: #454a50;
    }

    .page-info {
      max-width: 860px;
      margin: 46px auto 0;
      padding-top: 8px;
      border-top: 2px solid #333;
    }

    .page-info section {
      padding: 24px 0;
      border-bottom: 1px solid var(--line);
    }

    .page-info h2 {
      margin: 0 0 10px;
      font-size: 21px;
    }

    .page-info h3 {
      margin: 20px 0 6px;
      font-size: 16px;
    }

    .page-info p,
    .page-info ol,
    .page-info ul {
      margin: 8px 0;
    }

    .page-info ol,
    .page-info ul {
      padding-left: 1.5em;
    }

    .format-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 12px;
      font-size: 14px;
    }

    .format-table th,
    .format-table td {
      padding: 8px;
      border: 1px solid var(--line);
      text-align: left;
    }

    .format-table th {
      background: #f0f0f0;
    }

    .plain-link,
    .plain-button {
      color: #124f9d;
      text-decoration: underline;
      text-underline-offset: 2px;
    }

    .plain-button {
      padding: 0;
      border: 0;
      background: transparent;
    }

    .site-footer {
      max-width: 860px;
      margin: 0 auto;
      padding: 20px 0 40px;
      color: var(--muted);
      font-size: 12px;
    }

    .site-footer a {
      color: inherit;
    }

    .consent-banner {
      position: fixed;
      right: 12px;
      bottom: 12px;
      left: 12px;
      z-index: 100;
      max-width: 720px;
      margin: 0 auto;
      padding: 14px;
      border: 1px solid #777;
      background: #fff;
      color: var(--text);
      font-size: 13px;
    }

    .consent-banner p {
      margin: 0;
    }

    .consent-actions {
      display: flex;
      gap: 8px;
      margin-top: 10px;
    }

    .consent-actions button {
      min-height: 36px;
      padding: 0 12px;
      border: 1px solid #777;
      border-radius: 3px;
      background: #fff;
    }

    .consent-actions .allow-analytics {
      border-color: var(--accent);
      background: var(--accent);
      color: #fff;
    }

    .toast {
      position: fixed;
      left: 50%;
      bottom: 24px;
      z-index: 30;
      max-width: min(92vw, 620px);
      padding: 11px 14px;
      border-radius: 9px;
      background: rgba(24, 25, 27, .94);
      color: #fff;
      box-shadow: 0 10px 28px rgba(0, 0, 0, .18);
      font-size: 13px;
      line-height: 1.5;
      transform: translate(-50%, 12px);
      opacity: 0;
      pointer-events: none;
      transition: opacity .15s ease, transform .15s ease;
    }

    .toast.is-visible {
      opacity: 1;
      transform: translate(-50%, 0);
    }

    @media (pointer: coarse), (max-width: 720px) {
      .toast { bottom: calc(110px + env(safe-area-inset-bottom)); }
    }

    @media (max-width: 720px) {
      .app {
        padding: 12px;
      }

      .header {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
      }

      .drop-zone {
        min-height: 280px;
        padding: 22px 16px;
      }

      .toolbar {
        align-items: stretch;
      }

      .editor-controls {
        top: 0;
        margin-inline: -4px;
        padding: 4px 4px 6px;
      }

      .editor-controls .toolbar {
        padding: 6px;
      }

      .tool-group {
        flex: 1 1 100%;
        overflow-x: auto;
      }

      .tool-group button {
        flex: 0 0 auto;
        white-space: nowrap;
      }

      .toolbar-spacer {
        display: none;
      }

      .strength-control {
        flex: 1 1 100%;
      }

      .selection-control {
        flex: 1 1 100%;
      }

      .strength-control input[type="range"] {
        flex: 1 1 auto;
      }

      .image-meta {
        display: none;
      }

      .annotation-controls {
        flex: 1 1 100%;
      }

      .annotation-controls input[type="text"] {
        width: min(100%, 320px);
      }

      .quick-actions {
        display: grid;
        grid-template-columns: auto auto 64px minmax(54px, .8fr) minmax(72px, 1fr);
        align-items: center;
        gap: 6px;
      }

      .quick-actions > label,
      .quick-actions .toolbar-spacer {
        display: none;
      }

      .quick-actions .auto-copy-control {
        display: flex;
        grid-row: 2;
        grid-column: 1 / -1;
        justify-content: center;
      }

      .quick-actions button {
        min-width: 0;
        padding-inline: 7px;
      }

      .quick-actions select {
        width: 64px;
        min-width: 0;
      }

      .quick-actions .output-file-size {
        grid-row: 3;
        grid-column: 1 / -1;
      }

      .wide-label {
        display: none;
      }

      .resize-control {
        flex: 1 1 100%;
        padding-bottom: 8px;
        border-bottom: 1px solid var(--line);
      }

      .hint-row {
        align-items: flex-start;
        flex-direction: column;
        gap: 4px;
      }
    }

    @media (pointer: coarse), (max-width: 720px) {
      .app { padding-bottom: calc(130px + env(safe-area-inset-bottom)); }

      .touch-actions {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 5px;
      }

      .touch-actions [role="group"] {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 5px;
        grid-column: 1 / 3;
      }

      .touch-actions button {
        min-width: 0;
        padding-inline: 4px;
        white-space: nowrap;
      }

      #touchModeHelp {
        grid-column: 1 / 4;
        grid-row: 2;
        align-self: center;
        line-height: 1.4;
      }

      #touchSaveButton {
        grid-column: 4;
        grid-row: 2;
      }

      .quick-actions #undoButton,
      .quick-actions #redoButton {
        display: none;
      }

      .quick-actions {
        grid-template-columns: 64px minmax(70px, 1fr) minmax(70px, 1fr);
      }

      .toast { bottom: calc(130px + env(safe-area-inset-bottom)); }
    }