.tool-intro { max-width: 46rem; padding: 3.5rem 0 2rem; }
.tool-intro h1 { max-width: 15ch; }
.tool-intro .intro { max-width: 42rem; }
.tool-layout { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(14rem, .8fr); gap: 2rem; align-items: start; padding-bottom: 3.5rem; }
.tool-panel { padding: clamp(1.25rem, 4vw, 2rem); border: 1px solid var(--border); border-radius: 22px; background: var(--surface); }
.tool-panel h2 { font-size: clamp(1.45rem, 3vw, 1.85rem); }
.tool-panel fieldset { min-width: 0; margin: 1.5rem 0 0; padding: 0; border: 0; }
.tool-panel legend { margin-bottom: .75rem; font-weight: 650; }
.tool-panel .intro { margin-top: .75rem; font-size: 1rem; }
.tool-meta { margin: 0 0 .85rem; color: var(--muted); font-size: .85rem; }
.option { display: flex; align-items: center; gap: .85rem; min-height: 52px; margin-top: .6rem; padding: .8rem 1rem; border: 1px solid var(--border); border-radius: 12px; cursor: pointer; }
.option:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
input[type="radio"], input[type="checkbox"] { flex: 0 0 auto; width: 20px; height: 20px; accent-color: var(--accent); }
input:focus-visible { outline-offset: 4px; }
button { font: inherit; }
button.button { border: 0; cursor: pointer; }
button:disabled { cursor: default; opacity: .55; }
.secondary-button { min-height: 44px; padding: .5rem .9rem; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); color: var(--text); cursor: pointer; }
.feedback { margin-top: 1.25rem; padding: 1rem 0 0 1rem; border-left: 3px solid var(--accent); }
.feedback p + p { margin-top: .5rem; }
.feedback:empty { display: none; }
.score { margin: 1rem 0; color: var(--accent); font-size: 3.5rem; font-weight: 750; line-height: 1.1; }
.tool-side p { color: var(--muted); font-size: .95rem; }
.tool-side .store-link { margin-top: 1.25rem; }
.tool-side img.app-icon { width: 56px; margin-bottom: 1rem; border-radius: 14px; }
.word-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; }
.word-list h3 { font-size: 1.3rem; }
.word-list p { color: var(--muted); }
.word-list article { border-top: 1px solid var(--border); padding-top: 1.2rem; }
.share-status { margin-top: .65rem; color: var(--muted); font-size: .85rem; }
.timer { display: block; margin: 1rem 0; font-size: clamp(3.5rem, 10vw, 5rem); font-weight: 750; font-variant-numeric: tabular-nums; letter-spacing: -.04em; line-height: 1.1; }
.checklist { display: grid; gap: 1rem; margin: 1.5rem 0 0; padding: 0; list-style: none; }
.checklist label { display: flex; align-items: start; gap: .9rem; cursor: pointer; }
.checklist input { margin-top: .25rem; }
.checklist strong { display: block; }
.checklist span span { display: block; margin-top: .2rem; color: var(--muted); font-size: .9rem; }
.check-count { margin-top: 1.4rem; color: var(--muted); font-size: .85rem; }
.demo { display: grid; grid-template-columns: minmax(0, 1fr) 14rem; gap: 2.5rem; align-items: center; }
.demo figure { margin: 0; }
.demo img { max-height: 28rem; width: auto; margin: auto; border: 1px solid var(--border); border-radius: 24px; }
.demo figcaption { margin-top: .75rem; color: var(--muted); font-size: .8rem; text-align: center; }
.demo ol { padding-left: 1.25rem; }
.demo li + li { margin-top: 1rem; }
.tool-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
[hidden] { display: none !important; }
@media (max-width: 48rem) {
  .tool-layout { grid-template-columns: 1fr; }
  .tool-intro { padding-top: 2.5rem; }
  .tool-side { border-top: 1px solid var(--border); padding-top: 1.5rem; }
  .demo { grid-template-columns: 1fr; }
  .demo figure { max-width: 15rem; margin-inline: auto; }
}
@media (max-width: 28rem) { .word-list { grid-template-columns: 1fr; } }
@media print {
  .tool-layout, .demo { display: block; }
  .tool-panel, .tool-side { border: 0; padding: 0; }
  .timer, .tool-panel button, .tool-side, #quiz-app, .share-status { display: none; }
  .tool-intro { padding-top: 1rem; }
  .checklist li, .word-list article { break-inside: avoid; }
}