.scratch-toggle { width: 44px; height: 44px; flex-shrink: 0; border: 2px solid #b4c1c3; border-radius: 8px; background: #fff; color: #1b373d; font: 1.7rem Arial,sans-serif; cursor: pointer; }
.scratch-toggle:hover { border-color: #d31316; }
.scratch-toggle, .scratch-panel button { touch-action: manipulation; }
.scratch-toggle img, .scratch-panel button img { display: block; margin: auto; }
.scratch-panel button[aria-pressed="true"] img { filter: invert(1); }
.scratch-toggle[hidden], .scratch-panel[hidden] { display: none !important; }
.quiz-card { position: relative; }
.quiz-card > .scratch-toggle { position: absolute; right: 12px; top: 12px; }
.sum-row { gap: 10px; }
.sum-row input { width: 85px; }
.scratch-panel { min-width: 0; margin-top: 22px; color: #1b373d; background: #fff; border: 1px solid #b4c1c3; border-radius: 8px; overflow: hidden; }
.scratch-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 12px; border-bottom: 1px solid #d8d8d8; gap: 10px; }
.scratch-head h2 { margin: 0; font-size: 1.15rem; letter-spacing: 0; }
.scratch-tools { display: flex; align-items: center; gap: 6px; padding: 8px 12px; border-bottom: 1px solid #d8d8d8; }
.scratch-panel button { min-width: 44px; min-height: 44px; border: 1px solid #b4c1c3; border-radius: 6px; background: #fff; color: #1b373d; font: 700 1rem "Trebuchet MS",sans-serif; cursor: pointer; }
.scratch-tools button { font-size: 1.35rem; }
.scratch-panel button[aria-pressed="true"] { background: #1b373d; color: #fff; }
.scratch-panel button:disabled { opacity: .4; cursor: default; }
.scratch-panel button:hover:not(:disabled) { border-color: #d31316; }
.scratch-panel :focus-visible, .scratch-toggle:focus-visible { outline: 3px solid #d31316; outline-offset: 2px; }
.scratch-answer { display: flex; align-items: center; gap: 10px; padding: 12px; flex-wrap: wrap; }
.scratch-sum { font-size: 1.35rem; font-weight: 900; letter-spacing: 0; }
.scratch-answer input { min-width: 0; width: 85px; height: 44px; padding: 8px; border: 2px solid #b4c1c3; border-radius: 6px; font: 1.2rem "Trebuchet MS",sans-serif; color: #1b373d; }
.scratch-answer button { padding: 0 12px; background: #d31316; color: #fff; border-color: #d31316; }
.scratch-feedback { min-height: 22px; padding: 0 12px 8px; margin: 0; font-size: .95rem; }
.scratch-canvas-wrap { min-height: 180px; height: 360px; position: relative; background: #fff; }
.scratch-canvas { display: block; width: 100%; height: 100%; touch-action: none; cursor: crosshair; background: #eef2f2; }
.scratch-panel [hidden] { display: none !important; }
.scratch-text { display: block; width: 100%; min-height: 180px; height: 360px; margin: 0; padding: 16px; border: 0; border-radius: 0; resize: vertical; background: #fff; color: #1b373d; font: 20px/1.6 "Trebuchet MS",sans-serif; letter-spacing: 0; box-sizing: border-box; }
.scratch-text:focus-visible { outline-offset: -3px; }
.scratch-dialog .scratch-text { flex: 1 0 100px; min-height: 100px; height: auto; resize: none; }
.scratch-dialog .scratch-panel > :not(.scratch-text):not(.scratch-canvas-wrap) { flex-shrink: 0; }
.scratch-dialog { width: 100%; max-width: none; height: 100dvh; max-height: none; margin: 0; padding: 0; border: 0; background: #fff; }
.scratch-dialog::backdrop { background: #1b373d99; }
.scratch-dialog .scratch-panel { height: 100%; margin: 0; border: 0; border-radius: 0; display: flex; flex-direction: column; padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }
.scratch-dialog .scratch-canvas-wrap { flex: 1; min-height: 100px; height: auto; }
body.scratch-modal-open { overflow: hidden; }
@media (min-width: 950px) {
  #quiz-screen.scratch-open { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); column-gap: 24px; }
  #quiz-screen.scratch-open > .quiz-meta, #quiz-screen.scratch-open > .progress-track { grid-column: 1 / -1; }
  #quiz-screen.scratch-open > .quiz-card { grid-column: 1; }
  #quiz-screen.scratch-open > .keypad { grid-column: 1; }
  #quiz-screen.scratch-open > .scratch-panel { grid-column: 2; grid-row: 3 / span 2; margin: 0; align-self: start; position: sticky; top: 16px; }
  #level-one-screen.scratch-open { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); column-gap: 24px; }
  #level-one-screen.scratch-open > .game-heading, #level-one-screen.scratch-open > .progress-track { grid-column: 1 / -1; }
  #level-one-screen.scratch-open > .sums-list { grid-template-columns: 1fr; }
  #level-one-screen.scratch-open > .scratch-panel { margin: 0; position: sticky; top: 16px; align-self: start; }
  .scratch-open .big-sum { font-size: 3rem; }
}
@media (max-width: 380px) {
  .sum-row { padding: 10px; gap: 6px; }
  .sum-row label { font-size: 1.15rem; }
  .sum-row input { width: 64px; }
}