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image-tool / frontend /src /components /MaskEditor.tsx
JunyoungK7
Claude Sonnet 4.6
Make UI responsive for mobile: scale canvas, scrollable tabs, flexible toolbar
4a4b2e4 4 months ago
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/**
 * MaskEditor.tsx — fabric.js canvas for painting mask strokes, multi-step
 * iterative editing, and step history navigation.
 *
 * Phases
 * ------
 * "painting"   — canvas is interactive; user paints strokes.
 * "generating" — POST /generate sent; polling in progress; canvas locked.
 * "completed"  — current step finished; before/after shown; step navigator shown.
 * "failed"     — POST failed OR job failed; error shown; user can try again.
 *
 * Canvas re-initialisation
 * ------------------------
 * The canvas effect depends on `currentBaseUrl` (not the raw File object).
 * On first mount, `currentBaseUrl` is set from URL.createObjectURL(imageFile).
 * On "Do More Work", it is set to the latest step's result HTTP URL.
 * Either way, FabricImage.fromURL() accepts both object URLs and HTTP URLs,
 * so the same canvas init path handles both cases.
 *
 * Step navigation
 * ---------------
 * `viewedStepNumber` controls which step's result is displayed in the result
 * panel.  null = the just-completed step (currentStep from the hook).
 * Clicking a step in the history strip calls goToStep() on the backend (sets
 * backend current_step) and then refreshResult() to sync local hook state,
 * then sets viewedStepNumber to that step.  "Do More Work" clears it back to
 * null and resets the canvas for a fresh painting session from that result.
 *
 * Coordinate contract
 * -------------------
 * fabric.js coordinates are in CANVAS pixel space.
 * Backend expects ORIGINAL IMAGE pixel space.
 *   toOriginalScale = imageNaturalWidth / displayWidth
 *   original_x      = canvas_x * toOriginalScale
 * Applied to every brush point AND brushSize before sending to /generate.
 * The result images always have the same pixel dimensions as the original,
 * so toOriginalScale stays correct across all steps.
 */

import { useEffect, useState } from "react";
import {
  Paintbrush,
  Eraser,
  Undo2,
  Wand2,
  Download,
  PencilLine,
  RotateCcw,
  History,
} from "lucide-react";
import { useEditor } from "../store/editorStore";
import { generateMask, goToStep, API_BASE } from "../api/client";
import { useJobPolling } from "../hooks/useJobPolling";
import { useMaskCanvas } from "../hooks/useMaskCanvas";
import type { StepSummary } from "../api/client";

// ---------------------------------------------------------------------------
// Types
// ---------------------------------------------------------------------------

type Phase = "painting" | "generating" | "completed" | "failed";

// ---------------------------------------------------------------------------
// StepHistory — horizontal strip of completed steps; clicking navigates
// ---------------------------------------------------------------------------

function StepHistory({
  steps,
  activeStepNumber,
  currentStep,
  onGotoStep,
}: {
  steps:            StepSummary[];
  activeStepNumber: number;   // the step currently displayed in the result panel
  currentStep:      number;   // backend's current_step (determines "Do More Work" base)
  onGotoStep:       (n: number) => void;
}) {
  const completed = steps
    .filter(s => s.status === "completed")
    .sort((a, b) => a.step_number - b.step_number);
  if (completed.length <= 1) return null; // nothing useful to navigate
  const maxStep = completed[completed.length - 1].step_number;
  return (
    <div style={histStyles.wrap}>
      <span style={histStyles.label}>
        <History size={13} style={{ verticalAlign: "middle", marginRight: 4 }} />
        History
      </span>
      <div style={histStyles.strip}>
        {completed.map(s => {
          const isActive = s.step_number === activeStepNumber;
          return (
            <button
              key={s.step_number}
              onClick={() => onGotoStep(s.step_number)}
              style={{
                ...histStyles.stepBtn,
                ...(isActive ? histStyles.stepBtnActive : {}),
              }}
              title={s.step_number === 0 ? "Uploaded original" : `Result after step ${s.step_number}`}
            >
              {s.step_number === 0 ? "Original" : `Step ${s.step_number}`}
            </button>
          );
        })}
      </div>
      {currentStep < maxStep && (
        <p style={histStyles.discardNote}>
          Doing more work from here will discard steps {currentStep + 1}–{maxStep}.
        </p>
      )}
    </div>
  );
}
const histStyles: Record<string, React.CSSProperties> = {
  wrap: {
    marginTop:    24,
    padding:      "14px 16px",
    background:   "#ffffff",
    border:       "1px solid #e8eaed",
    borderRadius: 10,
    boxShadow:    "0 1px 6px rgba(0,0,0,0.10)",
  },
  label: {
    fontSize:      11,
    fontWeight:    700,
    color:         "#94a3b8",
    textTransform: "uppercase",
    letterSpacing: "0.07em",
    display:       "block",
    marginBottom:  10,
  },
  strip: {
    display:  "flex",
    gap:      6,
    flexWrap: "wrap",
  },
  stepBtn: {
    padding:      "4px 12px",
    background:   "#fff",
    border:       "1px solid #e2e8f0",
    borderRadius: 6,
    cursor:       "pointer",
    fontSize:     13,
    fontWeight:   500,
    color:        "#475569",
  },
  stepBtnActive: {
    background:  "#3b82f6",
    border:      "1px solid #2563eb",
    color:       "#fff",
    fontWeight:  600,
    boxShadow:   "0 1px 3px rgba(59,130,246,0.3)",
  },
  discardNote: {
    margin:       "12px 0 0",
    fontSize:     12,
    color:        "#92400e",
    background:   "#fffbeb",
    border:       "1px solid #fde68a",
    borderRadius: 6,
    padding:      "4px 10px",
    display:      "inline-block",
  },
};
// ---------------------------------------------------------------------------
// Main component
// ---------------------------------------------------------------------------
export function MaskEditor() {
  const editor = useEditor();
  const { jobId, imageFile, imageNaturalWidth, imageNaturalHeight } = editor;
  const {
    canvasElRef,
    displayWidth,
    displayHeight,
    toOriginalScale,
    brushSize,
    setBrushSize,
    strokeCount,
    buildMaskJson,
    handleClear,
    handleUndo,
    setDrawingMode,
    setBaseUrl,
  } = useMaskCanvas({ imageFile: imageFile ?? null, imageNaturalWidth, imageNaturalHeight });
  const [phase,         setPhase]         = useState<Phase>("painting");
  const [generateError, setGenerateError] = useState<string | null>(null);
  // Which step is shown in the result panel.  null = show currentStep's result.
  const [viewedStepNumber, setViewedStepNumber] = useState<number | null>(null);
  // CSS scale factor applied to the canvas wrapper so it fits narrow viewports.
  // Recomputed on mount and on window resize. ≤1.0; 1.0 = no scaling (desktop).
  const [canvasScale, setCanvasScale] = useState(1);
  const {
    pollPhase,
    errorMessage: pollError,
    steps,
    currentStep,
    startPolling,
    refreshResult,
    reset: resetPoll,
    resetPollPhase,
  } = useJobPolling();
  // -------------------------------------------------------------------------
  // Sync pollPhase → component phase
  // Only reset viewedStepNumber when first arriving at "completed"
  // (NOT on subsequent refreshResult calls, which don't change pollPhase).
  // -------------------------------------------------------------------------
  useEffect(() => {
    if (pollPhase === "completed" && phase !== "completed") {
      setPhase("completed");
      setViewedStepNumber(null); // show the just-completed step
    }
    if (pollPhase === "failed") setPhase("failed");
  }, [pollPhase, phase]);
  // -------------------------------------------------------------------------
  // Sync phase → fabric isDrawingMode (via hook)
  // -------------------------------------------------------------------------
  useEffect(() => {
    setDrawingMode(phase === "painting");
  }, [phase, setDrawingMode]);
  // -------------------------------------------------------------------------
  // Canvas CSS scale — keeps the painted canvas within the page container width
  // (max 880px - 48px padding = 832px) on narrow viewports.  Recomputed on
  // resize so orientation changes are handled.  Fabric.js uses
  // getBoundingClientRect() internally, so the coordinate mapping stays correct
  // even when a CSS transform scale is applied to the canvas wrapper.
  // -------------------------------------------------------------------------
  useEffect(() => {
    if (!displayWidth) return;
    const update = () => {
      const avail = Math.min(window.innerWidth - 48, 880);
      setCanvasScale(Math.min(1, avail / displayWidth));
    };
    update();
    window.addEventListener("resize", update);
    return () => window.removeEventListener("resize", update);
  }, [displayWidth]);
  // -------------------------------------------------------------------------
  // Generate — POST /generate then start polling
  // -------------------------------------------------------------------------
  const handleGenerate = async () => {
    if (!jobId) return;
    const maskJson = buildMaskJson();
    if (!maskJson) return;
    setPhase("generating");
    setGenerateError(null);
    try {
      await generateMask(jobId, maskJson);
      startPolling(jobId);
    } catch (err) {
      setGenerateError((err as Error).message);
      setPhase("failed");
    }
  };
  // -------------------------------------------------------------------------
  // Do More Work — reset canvas to latest result and return to painting
  // -------------------------------------------------------------------------
  const handleDoMoreWork = () => {
    const latestStepData = steps.find(s => s.step_number === currentStep);
    if (!latestStepData?.result_image_url) return;
    // resetPollPhase() clears pollPhase → "idle" without touching steps[].
    // This is critical: the pollPhase→phase sync effect (line ~261) re-fires
    // whenever phase changes.  If pollPhase is still "completed" when we set
    // phase to "painting", that effect immediately overwrites it back to
    // "completed", which then makes the phase-sync effect set
    // fc.isDrawingMode = false on the freshly-created canvas — killing drawing.
    resetPollPhase();
    // Setting base URL triggers the canvas init effect in useMaskCanvas,
    // which also resets strokesRef and strokeCount.
    setBaseUrl(`${API_BASE}${latestStepData.result_image_url}`);
    setViewedStepNumber(null);
    setGenerateError(null);
    setPhase("painting");
  };
  // -------------------------------------------------------------------------
  // Navigate to a specific step in history
  // -------------------------------------------------------------------------
  const handleGotoStep = async (stepNumber: number) => {
    if (!jobId) return;
    try {
      await goToStep(jobId, stepNumber);
      // Update the result panel display first (instant feedback),
      // then silently sync hook's currentStep from the backend.
      setViewedStepNumber(stepNumber);
      refreshResult(jobId);
    } catch { /* goToStep failure is non-critical — display unchanged */ }
  };
  // -------------------------------------------------------------------------
  // Try Again — return to painting without losing strokes
  // -------------------------------------------------------------------------
  const handleTryAgain = () => {
    // Don't call resetPoll() — it would clear steps[].
    setGenerateError(null);
    setPhase("painting");
  };
  // -------------------------------------------------------------------------
  // Start Over — full reset back to ImageUploader
  // -------------------------------------------------------------------------
  const handleStartOver = () => {
    resetPoll();     // clears everything including steps[]
    setViewedStepNumber(null);
    setGenerateError(null);
    editor.reset();  // clears jobId → App re-renders ImageUploader (unmounts canvas)
  };
  // -------------------------------------------------------------------------
  // Download result
  // -------------------------------------------------------------------------
  const handleDownload = async (imageUrl: string | null | undefined) => {
    if (!imageUrl) return;
    try {
      const res  = await fetch(`${API_BASE}${imageUrl}`);
      const blob = await res.blob();
      const url  = URL.createObjectURL(blob);
      const a    = document.createElement("a");
      a.href     = url;
      a.download = "result.jpg";
      document.body.appendChild(a);
      a.click();
      document.body.removeChild(a);
      URL.revokeObjectURL(url);
    } catch { /* user can right-click as fallback */ }
  };
  // -------------------------------------------------------------------------
  // Guard
  // -------------------------------------------------------------------------
  if (!imageFile || !displayWidth || !displayHeight) return null;
  // Derived display state
  const isScaledDown = toOriginalScale > 1.0;
  const isPainting   = phase === "painting";
  const isGenerating = phase === "generating";
  const isCompleted  = phase === "completed";
  const isFailed     = phase === "failed";
  const displayError = generateError ?? pollError;
  // Which step to show in the result panel
  const effectiveViewedStep = viewedStepNumber ?? currentStep;
  const displayedStep       = steps.find(s => s.step_number === effectiveViewedStep) ?? null;
  // "Do More Work" is always available from the step the backend thinks is current.
  const latestStepData  = steps.find(s => s.step_number === currentStep) ?? null;
  const canDoMoreWork   = isCompleted && !!latestStepData?.result_image_url;
  return (
    <div style={styles.page}>
      {/* Header */}
      <div style={styles.header}>
        <h2 style={styles.heading}>Paint over text / watermarks</h2>
        <p style={styles.meta}>
          Job: <code>{jobId}</code>
          &nbsp;·&nbsp;Original: {imageNaturalWidth}×{imageNaturalHeight}px
          {isScaledDown
            ? ` · Canvas: ${displayWidth}×${displayHeight}px · scale ${(1 / toOriginalScale).toFixed(3)}×`
            : " · displayed at natural size (1.0×)"}
        </p>
      </div>
      {/* Toolbar — visible only while painting */}
      {isPainting && (
        <div style={styles.toolbar}>
          <label style={styles.label}>
            <Paintbrush size={15} style={styles.iconGap} />
            Brush:&nbsp;<strong>{brushSize}px</strong>
            <input
              type="range"
              min={5}
              max={60}
              value={brushSize}
              onChange={e => setBrushSize(Number(e.target.value))}
              style={styles.slider}
            />
          </label>
          <button
            style={styles.btnSecondary}
            onClick={handleClear}
            disabled={strokeCount === 0}
          >
            <Eraser size={15} style={styles.iconGap} />
            Clear ({strokeCount})
          </button>
          <button
            style={styles.btnSecondary}
            onClick={handleUndo}
            disabled={strokeCount === 0}
          >
            <Undo2 size={15} style={styles.iconGap} />
            Undo
          </button>
          <button
            style={{
              ...styles.btnPrimary,
              ...(strokeCount === 0 ? styles.btnDisabled : {}),
            }}
            onClick={handleGenerate}
            disabled={strokeCount === 0}
          >
            <Wand2 size={15} style={styles.iconGap} />
            Remove Watermark
          </button>
        </div>
      )}
      {/* Canvas + overlays — outer div clips & sizes to the CSS-scaled dimensions */}
      <div style={{ width: "100%", overflow: "hidden" }}>
        {/* position: relative context for the overlay; sized to the VISUAL (scaled) area */}
        <div style={{
          position: "relative",
          width:    displayWidth  * canvasScale,
          height:   displayHeight * canvasScale,
        }}>
          {/* Canvas rendered at full pixel dimensions, then scaled down via CSS transform */}
          <div style={{
            position:        "absolute",
            top:             0,
            left:            0,
            width:           displayWidth,
            height:          displayHeight,
            transform:       canvasScale < 1 ? `scale(${canvasScale})` : undefined,
            transformOrigin: "top left",
          }}>
            <div style={{ ...styles.canvasWrapper, width: displayWidth, height: displayHeight }}>
              <canvas ref={canvasElRef} />
            </div>
          </div>
          {isGenerating && (
            <div style={styles.overlay}>
              <div style={styles.overlayCard}>
                <Spinner />
                <p style={styles.overlayTitle}>Removing watermark…</p>
                <p style={styles.overlaySubtitle}>Polling for result every 2 s</p>
              </div>
            </div>
          )}
        </div>
      </div>
      {/* Painting hint */}
      {isPainting && (
        <p style={styles.hint}>
          {strokeCount === 0
            ? <>Paint red over every watermark region, then click <strong>Remove Watermark</strong>.</>
            : <>{strokeCount} stroke{strokeCount !== 1 ? "s" : ""} painted — clear, adjust, or click <strong>Remove Watermark</strong>.</>}
        </p>
      )}
      {/* Completed result section */}
      {isCompleted && displayedStep && (
        <div style={styles.resultSection}>
          {/* Step history navigator */}
          <StepHistory
            steps={steps}
            activeStepNumber={effectiveViewedStep}
            currentStep={currentStep}
            onGotoStep={handleGotoStep}
          />
          {/* Before / After comparison */}
          <div style={styles.comparisonHeader}>
            {effectiveViewedStep === 0 ? (
              <p style={styles.bannerTitle}>Step 0 — uploaded original</p>
            ) : (
              <p style={styles.bannerTitle}>
                ✓ Step {effectiveViewedStep} completed.
              </p>
            )}
          </div>
          <div style={styles.comparison}>
            {effectiveViewedStep > 0 && (
              <div style={styles.compareCol}>
                <p style={styles.compareLabel}>Before</p>
                {displayedStep.original_image_url && (
                  <img
                    src={`${API_BASE}${displayedStep.original_image_url}`}
                    alt="Before"
                    style={styles.compareImg}
                  />
                )}
              </div>
            )}
            <div style={styles.compareCol}>
              <p style={styles.compareLabel}>
                {effectiveViewedStep === 0 ? "Original" : "After"}
              </p>
              {displayedStep.result_image_url && (
                <img
                  src={`${API_BASE}${displayedStep.result_image_url}`}
                  alt="After"
                  style={styles.compareImg}
                />
              )}
            </div>
          </div>
          {/* Action buttons */}
          <div style={styles.resultActions}>
            {canDoMoreWork && (
              <button style={styles.btnPrimary} onClick={handleDoMoreWork}>
                <PencilLine size={15} style={styles.iconGap} />
                추가 작업하기
              </button>
            )}
            <button
              style={styles.btnSecondary}
              onClick={() => handleDownload(displayedStep.result_image_url)}
            >
              <Download size={15} style={styles.iconGap} />
              Download
            </button>
            <button style={styles.btnGhost} onClick={handleStartOver}>
              <RotateCcw size={14} style={styles.iconGap} />
              Start Over
            </button>
          </div>
        </div>
      )}
      {/* Failed section */}
      {isFailed && (
        <div style={styles.errorBanner}>
          <p style={styles.bannerTitle}>✗ Inpainting failed.</p>
          <p style={styles.bannerSub}>
            <strong>Error:</strong> {displayError}
          </p>
          <p style={styles.bannerSub}>Your strokes are preserved — try again.</p>
          {/* Show history even after failure — user can go back to a good step */}
          {steps.length > 1 && (
            <StepHistory
              steps={steps}
              activeStepNumber={effectiveViewedStep}
              currentStep={currentStep}
              onGotoStep={handleGotoStep}
            />
          )}
          <div style={{ display: "flex", gap: 10, marginTop: 14 }}>
            <button style={styles.btnPrimary} onClick={handleTryAgain}>
              ← Back to Painting
            </button>
            <button style={styles.btnGhost} onClick={handleStartOver}>
              <RotateCcw size={14} style={styles.iconGap} />
              Start Over
            </button>
          </div>
        </div>
      )}
    </div>
  );
}
// ---------------------------------------------------------------------------
// Spinner
// ---------------------------------------------------------------------------
function Spinner() {
  return <div style={spinnerStyle} />;
}
const spinnerStyle: React.CSSProperties = {
  width:        36,
  height:       36,
  border:       "4px solid #e5e7eb",
  borderTop:    "4px solid #3b82f6",
  borderRadius: "50%",
  animation:    "spin 0.9s linear infinite",
};
if (typeof document !== "undefined") {
  const id = "__mask_editor_spin";
  if (!document.getElementById(id)) {
    const s = document.createElement("style");
    s.id = id;
    s.textContent = "@keyframes spin { to { transform: rotate(360deg); } }";
    document.head.appendChild(s);
  }
}
// ---------------------------------------------------------------------------
// Styles
// ---------------------------------------------------------------------------
const styles: Record<string, React.CSSProperties> = {
  page: {
    maxWidth:   880,
    margin:     "48px auto 48px",
    padding:    "0 24px",
    fontFamily: "-apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif",
    color:      "#111827",
  },
  header: {
    marginBottom:  24,
    paddingBottom: 16,
    borderBottom:  "1px solid #f0f2f4",
  },
  heading: {
    fontSize:      22,
    fontWeight:    600,
    margin:        "0 0 4px",
    letterSpacing: "-0.01em",
    color:         "#111827",
  },
  meta: {
    fontSize: 12,
    color:    "#9ca3af",
    margin:   0,
  },
  toolbar: {
    display:      "flex",
    alignItems:   "center",
    gap:          8,
    marginBottom: 16,
    padding:      "10px 12px",
    background:   "#ffffff",
    borderRadius: 8,
    border:       "1px solid #e8eaed",
    flexWrap:     "wrap",
  },
  label: {
    display:    "flex",
    alignItems: "center",
    gap:        6,
    fontSize:   14,
    color:      "#374151",
    flex:       "1 1 auto",
    minWidth:   0,
  },
  iconGap: {
    marginRight:   4,
    verticalAlign: "middle",
    flexShrink:    0,
  } as React.CSSProperties,
  slider: {
    flex:        "1 1 60px",
    minWidth:    60,
    maxWidth:    160,
    marginLeft:  6,
    accentColor: "#3b82f6",
  },
  btnPrimary: {
    display:       "inline-flex",
    alignItems:    "center",
    padding:       "8px 18px",
    background:    "#3b82f6",
    border:        "none",
    borderRadius:  7,
    cursor:        "pointer",
    fontSize:      14,
    fontWeight:    600,
    color:         "#fff",
    letterSpacing: "-0.01em",
    boxShadow:     "0 1px 3px rgba(59,130,246,0.25)",
  },
  btnSecondary: {
    display:      "inline-flex",
    alignItems:   "center",
    padding:      "7px 14px",
    background:   "#fff",
    border:       "1px solid #d1d5db",
    borderRadius: 7,
    cursor:       "pointer",
    fontSize:     14,
    fontWeight:   500,
    color:        "#374151",
    boxShadow:    "0 1px 2px rgba(0,0,0,0.05)",
  },
  btnGhost: {
    display:      "inline-flex",
    alignItems:   "center",
    padding:      "7px 12px",
    background:   "transparent",
    border:       "1px solid #e5e7eb",
    borderRadius: 7,
    cursor:       "pointer",
    fontSize:     13,
    color:        "#6b7280",
  },
  btnDisabled: {
    background: "#d1d5db",
    cursor:     "not-allowed",
    boxShadow:  "none",
  },
  canvasWrapper: {
    border:       "1px solid #e5e7eb",
    borderRadius: 10,
    overflow:     "hidden",
    lineHeight:   0,
    boxShadow:    "0 2px 16px rgba(0,0,0,0.12)",
  },
  overlay: {
    position:       "absolute",
    inset:          0,
    background:     "rgba(255,255,255,0.80)",
    display:        "flex",
    alignItems:     "center",
    justifyContent: "center",
    borderRadius:   10,
    backdropFilter: "blur(3px)",
  },
  overlayCard: {
    display:       "flex",
    flexDirection: "column",
    alignItems:    "center",
    gap:           12,
    background:    "#fff",
    padding:       "28px 40px",
    borderRadius:  12,
    boxShadow:     "0 8px 32px rgba(0,0,0,0.12)",
  },
  overlayTitle: {
    margin:     0,
    fontWeight: 600,
    fontSize:   14,
    color:      "#111827",
  },
  overlaySubtitle: {
    margin:   0,
    fontSize: 13,
    color:    "#6b7280",
  },
  hint: {
    marginTop: 12,
    fontSize:  13,
    color:     "#6b7280",
    lineHeight: 1.5,
  },
  resultSection: {
    marginTop: 24,
  },
  comparisonHeader: {
    marginTop: 20,
  },
  comparison: {
    display:   "flex",
    gap:       20,
    marginTop: 16,
    flexWrap:  "wrap",
  },
  compareCol: {
    flex:      1,
    minWidth:  200,
    textAlign: "center" as const,
  },
  compareLabel: {
    margin:     "0 0 8px",
    fontWeight: 600,
    fontSize:   13,
    color:      "#6b7280",
    textTransform: "uppercase" as const,
    letterSpacing: "0.05em",
  },
  compareImg: {
    maxWidth:     "100%",
    borderRadius: 8,
    border:       "1px solid #e5e7eb",
    display:      "block",
    margin:       "0 auto",
    boxShadow:    "0 1px 4px rgba(0,0,0,0.06)",
  },
  resultActions: {
    display:   "flex",
    gap:       8,
    marginTop: 20,
    flexWrap:  "wrap",
  },
  bannerTitle: {
    margin:     "0 0 6px",
    fontWeight: 600,
    fontSize:   14,
    color:      "#111827",
  },
  errorBanner: {
    marginTop:    16,
    padding:      "16px 20px",
    background:   "#fef2f2",
    border:       "1px solid #fca5a5",
    borderRadius: 10,
    color:        "#991b1b",
    boxShadow:    "0 1px 4px rgba(239,68,68,0.08)",
  },
  bannerSub: {
    margin:   "4px 0",
    fontSize: 13,
  },
};