/* Playground geometry; shared brand-theme.css owns the palette and typography. */
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { background: var(--ui-canvas); }
body { margin: 0; padding: env(safe-area-inset-top, 0px) env(safe-area-inset-right, 0px) env(safe-area-inset-bottom, 0px) env(safe-area-inset-left, 0px); font-family: var(--ui-font); line-height: 1.65; color: var(--ui-ink); }
button, a { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button { font: inherit; color: inherit; border: 0; }
button:not(:disabled) { cursor: pointer; }
/* Keep keyboard focus visible before :focus-visible is available. An unknown
   selector drops only the following enhancement, not this native :focus rule. */
button:focus, a:focus, h1:focus, [tabindex]:focus { outline: 3px solid var(--ui-focus); outline-offset: 4px; }
button:focus:not(:focus-visible), a:focus:not(:focus-visible), h1:focus:not(:focus-visible), [tabindex]:focus:not(:focus-visible) { outline: none; }
button:focus-visible, a:focus-visible, h1:focus-visible { outline: 3px solid var(--ui-focus); outline-offset: 4px; }
button:disabled { opacity: .5; cursor: not-allowed; }
button, img, svg { -webkit-user-select: none; user-select: none; -webkit-user-drag: none; }
p, h1, h2 { margin: 0; }
h1 { font-family: var(--ui-title-font); font-size: 36px; font-size: clamp(30px, 3vw, 44px); line-height: 1.5; }
h1 span { color: var(--brand-magenta); }
.prototype-ribbon { background: var(--brand-blue); color: var(--ui-surface); text-align: center; padding: 5px 16px; font-size: 12px; }
.prototype-ribbon span { margin: 0 8px; margin-inline: 8px; color: var(--brand-green); }
.app-header { max-width: 1320px; margin: auto; padding: 20px 32px; display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.school-brand, .display-tools { display: flex; align-items: center; gap: 12px; }
.school-brand img { object-fit: contain; }
.school-brand { color: inherit; text-decoration: none; min-height: 44px; }
.school-brand:hover strong { color: var(--brand-magenta); }
.school-brand strong { display: block; font-size: 21px; }
.school-brand span { display: block; color: var(--ui-muted); font-size: 12px; }
.display-tools { gap: 8px; }
.button { min-height: 48px; min-width: 44px; padding: 10px 18px; border-radius: var(--ui-control-radius); display: inline-flex; gap: 8px; justify-content: center; align-items: center; border: 1.5px solid transparent; font-weight: 600; transition: background .15s, border-color .15s; }
.button.subtle { background: var(--ui-surface); border-color: var(--ui-line); }
.button.subtle:hover { background: var(--ui-tint); border-color: var(--brand-blue); }
.button.subtle[aria-pressed="true"], .button.primary { background: var(--brand-blue); color: var(--ui-surface); }
.button.primary:hover { background: var(--ui-ink); }
.button.danger { background: var(--ui-surface); color: var(--ui-danger); border-color: var(--ui-danger); }
.button.danger:hover { background: var(--ui-danger); color: var(--ui-surface); }
.button:active:not(:disabled) { transform: translateY(1px); }
.learning-shell { max-width: 1200px; margin: 8px auto 0; padding: 0 32px 20px; }
.intro-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin: 18px 0 32px; margin-block: 18px 32px; }
.eyebrow { color: var(--ui-success); font-weight: 700; font-size: 13px; margin-bottom: 4px; }
.intro-copy { color: var(--ui-muted); margin-top: 4px; font-size: 15px; }
.progress-summary { display: grid; grid-template-columns: 40px auto; column-gap: 12px; min-width: 160px; }
.progress-summary strong { display: block; font-size: 23px; }
.progress-summary div > span { display: block; color: var(--ui-muted); font-size: 12px; }
.progress-flower { font-size: 44px; color: var(--brand-magenta); align-self: center; }
progress { grid-column: 1 / -1; width: 100%; height: 7px; border: 0; border-radius: 6px; overflow: hidden; margin-top: 10px; background: var(--ui-line); accent-color: var(--ui-success); }
progress::-webkit-progress-bar { background: var(--ui-line); }
progress::-webkit-progress-value { background: var(--ui-success); border-radius: 6px; }
progress::-moz-progress-bar { background: var(--ui-success); }
.library-heading { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.library-heading h2 { font-size: 18px; }
.library-heading > span { font-size: 12px; color: var(--ui-muted); }
.letter-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 14px; }
.letter-card { position: relative; display: flex; flex-direction: column; align-items: center; background: var(--ui-surface); border: 1.5px solid var(--ui-line); border-radius: 20px; padding: 16px 10px; min-width: 0; }
.letter-card:hover { border-color: var(--brand-blue); background: var(--ui-tint); }
.letter-card .card-order { position: absolute; right: 12px; inset-inline-start: 12px; top: 9px; font-size: 11px; color: var(--ui-muted); }
.letter-card .card-glyph { font-family: var(--ui-title-font); font-size: 70px; line-height: 1.3; color: var(--brand-blue); }
.card-name { font-weight: 700; font-size: 16px; }
.card-steps { color: var(--ui-muted); font-size: 11px; margin-top: 9px; }
.card-dots { display: flex; gap: 4px; margin-top: 9px; }
.card-dots i { width: 22px; height: 4px; border-radius: 3px; background: var(--ui-line); }
.card-dots i.complete { background: var(--ui-success); }
.mixed-card { width: 100%; margin-top: 22px; padding: 22px 26px; display: flex; align-items: center; gap: 24px; text-align: start; border: 1.5px solid var(--ui-line); border-radius: 20px; background: var(--ui-tint); }
.mixed-card:hover { border-color: var(--brand-blue); }
.mixed-art { font-family: var(--ui-title-font); font-size: 50px; color: var(--brand-magenta); white-space: nowrap; }
.mixed-art small { color: var(--brand-blue); font-size: 34px; }
.mixed-card strong { display: block; font-size: 23px; }
.mixed-card > span > span { display: block; font-size: 14px; color: var(--ui-muted); }
.mixed-card small { font-size: 12px; color: var(--ui-success); }
.card-arrow { margin-right: auto; margin-inline-start: auto; font-size: 26px; color: var(--brand-blue); }
.lesson-nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.lesson-nav > span { font-size: 12px; color: var(--ui-muted); }
.lesson-heading { display: flex; gap: 18px; align-items: center; margin: 18px 0; margin-block: 18px; }
.lesson-glyph { display: flex; align-items: center; justify-content: center; flex: 0 0 90px; height: 90px; font-family: var(--ui-title-font); font-size: 65px; background: var(--ui-tint); border-radius: 20px; color: var(--brand-magenta); }
.lesson-heading h1 { font-size: 32px; }
.mode-tabs { display: flex; gap: 6px; padding: 5px; background: var(--ui-line); border-radius: 16px; width: fit-content; margin-bottom: 18px; }
.mode-tabs button { display: flex; align-items: center; justify-content: center; padding: 12px 26px; min-height: 52px; border-radius: 12px; background: transparent; color: var(--brand-blue); font-weight: 700; }
.mode-tabs button:hover { background: var(--ui-tint); }
.mode-tabs button[aria-selected="true"] { background: var(--ui-surface); box-shadow: var(--ui-shadow); }
.activity-panel { background: var(--ui-surface); border: 1px solid var(--ui-line); border-radius: 24px; padding: 24px 30px 8px; box-shadow: 0 8px 28px rgba(37, 54, 80, .04); box-shadow: 0 8px 28px rgb(37 54 80 / 4%); }
.activity-heading { display: flex; align-items: center; gap: 16px; justify-content: space-between; margin-bottom: 20px; }
.activity-heading h2 { font-size: 24px; font-size: clamp(20px, 2vw, 26px); }
.activity-heading p { color: var(--ui-muted); font-size: 14px; margin-top: 4px; }
.round-count { font-size: 17px; min-width: 74px; text-align: center; background: var(--ui-tint); border-radius: 24px; padding: 6px 12px; white-space: nowrap; direction: ltr; unicode-bidi: isolate; }
.form-picker { display: flex; gap: 10px; }
.form-picker button { flex: 1; min-width: 0; min-height: 70px; padding: 8px; background: var(--ui-canvas); border: 2px solid var(--ui-line); border-radius: 14px; }
.form-picker button > span { display: block; font-family: var(--ui-title-font); font-size: 32px; line-height: 1.4; }
.form-picker button > small { font-size: 12px; }
.form-picker button[aria-pressed="true"] { border-color: var(--brand-blue); background: var(--ui-tint); }
.word-example { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 12px; padding: 12px; }
.word-example > span { font-size: 13px; color: var(--ui-muted); }
.word-example strong { font-size: 32px; font-family: var(--ui-title-font); }
#trace-saved { color: var(--ui-success); }
.trace-surface { border: 2px solid var(--ui-line); border-radius: 20px; overflow: hidden; background: var(--ui-canvas); }
#trace-board { display: block; width: 100%; height: auto; max-height: 310px; touch-action: none !important; cursor: crosshair; }
.writing-grid { color: var(--ui-line); }
.baseline { stroke: var(--ui-line); stroke-width: 2; stroke-dasharray: 7 8; }
.trace-stencil { fill: var(--ui-tint); fill: color-mix(in srgb, var(--brand-blue) 18%, var(--ui-surface)); stroke: var(--brand-blue); stroke-width: 1; stroke-dasharray: 2 3; vector-effect: non-scaling-stroke; pointer-events: none; }
.trace-ink { fill: none; stroke: var(--brand-magenta); stroke-width: 10; stroke-linecap: round; stroke-linejoin: round; opacity: .88; pointer-events: none; }
.trace-actions { display: flex; align-items: center; gap: 12px; justify-content: space-between; margin-top: 14px; }
.trace-actions p { font-size: 12px; color: var(--ui-muted); }
.match-targets, .match-sources { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.match-target { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 180px; min-width: 0; gap: 14px; background: var(--ui-canvas); border: 2px solid var(--ui-line); border-radius: 18px; padding: 20px 12px; touch-action: manipulation; }
.match-target .word { font-size: 36px; font-family: var(--ui-title-font); font-weight: 700; }
.match-target .sentence { font-size: 24px; font-family: var(--ui-title-font); font-weight: 600; line-height: 2.2; }
.letter-slot { font-size: 15px; line-height: 1.5; color: var(--ui-muted); padding: 5px 12px; min-height: 40px; border: 1.5px dashed var(--ui-muted); border-radius: 10px; }
.match-target:hover:not([aria-disabled="true"]) { border-color: var(--brand-blue); }
.match-target.is-over { outline: 3px solid var(--brand-magenta); outline-offset: 1px; background: var(--ui-tint); }
.match-target[data-matched="true"] { border-color: var(--ui-success); background: var(--mint-soft); background: color-mix(in srgb, var(--brand-green) 13%, var(--ui-surface)); }
.match-target[data-matched="true"] .letter-slot { color: var(--ui-success); border-style: solid; border-color: var(--ui-success); }
.match-source { min-width: 0; min-height: 112px; background: var(--ui-surface); color: var(--brand-blue); border: 2px solid var(--brand-blue); border-bottom-width: 5px; border-radius: 16px; padding: 8px; touch-action: none !important; }
.match-source > strong { display: block; font-family: var(--ui-title-font); font-size: 48px; line-height: 1.4; }
.match-source > small { display: block; font-size: 12px; }
.match-source.word-source > strong { font-size: 28px; }
.match-source:hover { background: var(--ui-tint); }
.match-source[aria-pressed="true"] { background: var(--brand-blue); color: var(--ui-surface); outline: 3px solid var(--brand-magenta); outline-offset: 3px; }
.match-source[aria-disabled="true"] { opacity: .42; border-style: dashed; border-bottom-width: 2px; cursor: default; }
.match-source.is-dragging { opacity: .25; }
.board-divider { text-align: center; font-size: 12px; color: var(--ui-muted); margin: 16px 0 12px; margin-block: 16px 12px; }
.activity-feedback { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0; padding-block: 12px; }
.activity-feedback p { color: var(--ui-muted); font-size: 14px; }
.activity-feedback p[data-tone="success"] { color: var(--ui-success); font-weight: 700; }
.activity-feedback p[data-tone="retry"] { color: var(--ui-focus); }
.feedback-actions { display: flex; gap: 8px; }
.quiz-word-wrap { background: var(--ui-canvas); border-radius: 20px; text-align: center; padding: 28px 16px; margin: 0 auto 24px; }
.quiz-word { font-family: var(--ui-title-font); font-size: 64px; font-size: clamp(52px, 6vw, 84px); line-height: 1.8; }
.quiz-answers { display: flex; justify-content: center; gap: 16px; }
.quiz-answers button { min-width: 100px; min-height: 78px; background: var(--ui-tint); border: 2px solid var(--brand-blue); border-radius: 16px; padding: 12px 20px; color: var(--brand-blue); font-size: 22px; font-weight: 700; }
.quiz-answers.letter-answers button { font-family: var(--ui-title-font); font-size: 46px; min-width: 100px; }
.quiz-answers button:hover { background: var(--ui-line); }
.quiz-answers button[data-correct="true"] { border-color: var(--ui-success); background: var(--mint-soft); background: color-mix(in srgb, var(--brand-green) 18%, var(--ui-surface)); color: var(--ui-success); opacity: 1; }
.letter-navigation { display: flex; justify-content: space-between; margin-top: 18px; gap: 12px; }
.device-progress { margin-top: 24px; padding: 14px 2px; border-top: 1px solid var(--ui-line); }
.privacy-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.privacy-row p, .progress-explanation, #legacy-progress { font-size: 12px; color: var(--ui-muted); }
.privacy-row p[data-tone="warning"] { color: var(--ui-danger); }
.text-button { font-size: 12px; color: var(--ui-muted); background: transparent; padding-left: 6px; padding-right: 6px; padding-inline: 6px; white-space: nowrap; }
.text-button:hover { color: var(--ui-danger); text-decoration: underline; }
.app-footer { max-width: 1200px; padding: 2px 32px 20px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 14px; color: var(--ui-muted); font-size: 12px; }
.parent-brand { display: flex; gap: 14px; align-items: center; }
.parent-brand img { object-fit: contain; }
.display-status { max-width: 1100px; margin: 0 auto 16px; text-align: center; font-size: 13px; padding: 0 16px; padding-inline: 16px; color: var(--ui-muted); }
.display-status:empty { margin: 0; }
dialog { width: calc(100vw - 32px); max-width: 480px; width: min(480px, calc(100vw - 32px)); max-height: calc(100vh - 32px); max-height: calc(100dvh - 32px); padding: 28px; border: 1px solid var(--ui-line); border-radius: 22px; color: var(--ui-ink); background: var(--ui-surface); }
dialog::backdrop { background: rgba(37, 54, 80, .5); background: rgb(37 54 80 / 50%); }
dialog:not([open]) { display: none; }
dialog[data-inline-fallback="true"][open] { position: static; display: block; margin: 20px auto; }
dialog h2 { font-size: 24px; margin-bottom: 10px; }
dialog p { color: var(--ui-muted); }
.dialog-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
#drag-ghost { position: fixed; left: 0; top: 0; z-index: 20; width: 125px; height: 90px; background: var(--brand-blue); color: var(--ui-surface); border: 3px solid var(--ui-surface); border-radius: 18px; box-shadow: var(--ui-shadow); font-family: var(--ui-title-font); font-size: 38px; display: flex; align-items: center; justify-content: center; pointer-events: none; will-change: transform; }
.no-script { padding: 20px; text-align: center; }
body.classroom .learning-shell, body.classroom .app-header, body.classroom .app-footer { max-width: 1720px; }
body.classroom .device-progress, body.classroom .app-footer { display: none; }
body.classroom .app-header { padding-top: 10px; padding-bottom: 10px; padding-block: 10px; }
body.classroom .lesson-heading { margin-top: 10px; margin-bottom: 10px; margin-block: 10px; }
body.classroom .letter-card .card-glyph { font-size: 100px; }
body.classroom .letter-card { min-height: 215px; }
body.classroom .button { min-height: 58px; font-size: 18px; }
body.classroom .match-target { min-height: 205px; }
body.classroom .match-target .word { font-size: 52px; }
body.classroom .match-target .sentence { font-size: 32px; }
body.classroom .match-source > strong { font-size: 62px; }
body.classroom .match-source.word-source > strong { font-size: 36px; }
body.classroom .activity-heading p, body.classroom .activity-feedback p { font-size: 18px; }
body.classroom #trace-board { max-height: 38vh; max-height: min(38vh, 600px); }
body.classroom .quiz-answers button { min-height: 100px; min-width: 160px; font-size: 30px; }
@media (min-width: 2300px) {
  body.classroom .learning-shell, body.classroom .app-header { max-width: 2600px; }
  body.classroom { font-size: 26px; }
  body.classroom h1, body.classroom .lesson-heading h1 { font-size: 64px; }
  body.classroom .letter-card { min-height: 350px; }
  body.classroom .letter-card .card-glyph { font-size: 170px; }
  body.classroom .card-name { font-size: 32px; }
  body.classroom .card-steps, body.classroom .intro-copy, body.classroom .lesson-nav > span { font-size: 24px; }
  body.classroom .mode-tabs button, body.classroom .button { min-height: 80px; font-size: 28px; }
  body.classroom .activity-heading h2 { font-size: 42px; }
  body.classroom .activity-heading p, body.classroom .activity-feedback p { font-size: 28px; }
  body.classroom .match-target { min-height: 330px; }
  body.classroom .match-target .word, body.classroom .quiz-word { font-size: 96px; }
  body.classroom .match-target .sentence { font-size: 48px; }
  body.classroom .match-source > strong { font-size: 100px; }
  body.classroom .match-source.word-source > strong { font-size: 64px; }
  body.classroom .match-source > small, body.classroom .letter-slot, body.classroom .form-picker button > small { font-size: 24px; }
  body.classroom .form-picker button > span { font-size: 60px; }
  body.classroom .quiz-answers button { min-height: 140px; min-width: 240px; font-size: 54px; }
}
@media (max-width: 700px) {
  .app-header { padding: 14px 16px; gap: 10px; flex-wrap: wrap; }
  .school-brand { gap: 9px; }
  .school-brand strong { font-size: 18px; }
  .school-brand img { width: 34px; height: 40px; }
  .display-tools { gap: 5px; }
  .display-tools .button { min-height: 44px; padding: 8px; font-size: 11px; }
  .learning-shell { padding: 0 14px 16px; margin-top: 0; }
  .intro-row { gap: 10px; margin: 12px 0 24px; margin-block: 12px 24px; }
  h1 { font-size: 29px; }
  .intro-copy { font-size: 12px; }
  .eyebrow { font-size: 11px; }
  .progress-summary { min-width: 76px; grid-template-columns: 1fr; text-align: center; gap: 0; }
  .progress-summary strong { font-size: 18px; }
  .progress-summary div > span { font-size: 10px; }
  .progress-flower { display: none; }
  .library-heading h2 { font-size: 16px; }
  .library-heading > span { font-size: 10px; }
  .letter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .letter-card { padding: 13px 8px; }
  .letter-card .card-glyph { font-size: 64px; }
  .mixed-card { margin-top: 16px; padding: 16px 12px; gap: 12px; }
  .mixed-art { font-size: 32px; }
  .mixed-art small { font-size: 24px; }
  .mixed-card strong { font-size: 20px; }
  .mixed-card > span > span { font-size: 12px; }
  .lesson-heading { gap: 12px; margin: 16px 0; margin-block: 16px; }
  .lesson-glyph { flex-basis: 64px; height: 70px; font-size: 48px; border-radius: 16px; }
  .lesson-heading h1 { font-size: 27px; }
  .lesson-nav .button { padding-left: 10px; padding-right: 10px; padding-inline: 10px; font-size: 12px; }
  .lesson-nav > span { font-size: 11px; }
  .mode-tabs { width: 100%; gap: 2px; padding: 4px; margin-bottom: 14px; }
  .mode-tabs button { flex: 1; padding: 10px 4px; font-size: 12px; min-height: 48px; }
  .activity-panel { padding: 16px 12px 4px; border-radius: 20px; }
  .activity-heading { gap: 8px; margin-bottom: 16px; }
  .activity-heading h2 { font-size: 19px; }
  .activity-heading p { font-size: 12px; }
  .round-count { font-size: 13px; min-width: 52px; padding: 5px 8px; }
  .form-picker { gap: 6px; }
  .form-picker button > small { font-size: 10px; }
  .form-picker button > span { font-size: 29px; }
  .word-example { padding: 10px 0; gap: 8px; }
  .word-example strong { font-size: 28px; }
  .word-example > span { font-size: 11px; }
  #trace-board { min-height: 245px; }
  .trace-actions { flex-wrap: wrap; gap: 8px; }
  .trace-actions .button { font-size: 12px; padding-left: 10px; padding-right: 10px; padding-inline: 10px; }
  .trace-actions p { order: 3; width: 100%; text-align: center; font-size: 10px; }
  .match-targets, .match-sources { gap: 7px; }
  .match-target { min-height: 137px; padding: 12px 4px; gap: 12px; border-radius: 13px; }
  .match-target .word { font-size: 24px; }
  .letter-slot { padding: 5px; font-size: 10px; min-height: 31px; }
  .match-source { min-height: 92px; padding: 6px 2px; border-radius: 12px; }
  .match-source > strong { font-size: 38px; }
  .match-source > small { font-size: 10px; }
  .match-source.word-source > strong { font-size: 23px; }
  .sentence-board .match-targets { grid-template-columns: 1fr; gap: 8px; }
  .sentence-board .match-target { min-height: 90px; flex-direction: row; justify-content: space-between; padding: 12px; }
  .sentence-board .match-target .sentence { font-size: 22px; }
  .sentence-board .letter-slot { flex: 0 0 62px; }
  .activity-feedback { flex-wrap: wrap; min-height: 74px; gap: 8px; }
  .activity-feedback p { font-size: 12px; }
  .activity-feedback .button { font-size: 12px; padding-left: 12px; padding-right: 12px; padding-inline: 12px; }
  .board-divider { margin: 12px 0; margin-block: 12px; font-size: 11px; }
  .quiz-word-wrap { padding: 22px 8px; margin-bottom: 18px; }
  .quiz-word { font-size: 58px; }
  .quiz-answers { gap: 10px; }
  .quiz-answers button { min-width: 0; flex: 1; padding: 12px 8px; font-size: 19px; }
  .quiz-answers.letter-answers button { min-width: 0; font-size: 40px; }
  .letter-navigation .button { font-size: 12px; padding-left: 12px; padding-right: 12px; padding-inline: 12px; }
  .privacy-row p, .progress-explanation, #legacy-progress { font-size: 10px; }
  .text-button { font-size: 11px; }
  .app-footer { padding-left: 18px; padding-right: 18px; padding-inline: 18px; font-size: 10px; }
  .parent-brand { gap: 8px; }
  .parent-brand img { width: 68px; height: 45px; }
  .app-footer > p { max-width: 110px; }
  body.classroom .button { font-size: 13px; min-height: 48px; }
  body.classroom .match-target { min-height: 150px; }
  body.classroom .match-target .word { font-size: 28px; }
  body.classroom .match-source > strong { font-size: 42px; }
  body.classroom .match-source.word-source > strong { font-size: 25px; }
  body.classroom .activity-heading p, body.classroom .activity-feedback p { font-size: 13px; }
  body.classroom .quiz-answers button { min-width: 0; font-size: 24px; }
  body.classroom .sentence-board .match-target { min-height: 105px; }
  body.classroom .match-target .sentence { font-size: 24px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }

/* Full library and six-level practice: same brand, shared interaction surfaces. */
.letter-grid { grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 12px; }
.letter-card { padding: 12px 7px; }
.letter-card .card-glyph { font-size: 62px; }
.library-heading { margin-top: 28px; }
#library-view > .mixed-card { margin: 0 0 26px; margin-block: 0 26px; }
.catalog-intro { margin: 26px 0 22px; margin-block: 26px 22px; max-width: 780px; }
.catalog-intro > p:last-child { color: var(--ui-muted); font-size: 16px; margin-top: 10px; }
.guide-note { border-right: 4px solid var(--brand-green); border-inline-start: 4px solid var(--brand-green); background: var(--ui-tint); border-radius: 12px; padding: 16px 20px; margin: 0 0 24px; margin-block: 0 24px; }
.guide-note strong { color: var(--brand-blue); font-size: 15px; }
.guide-note p { font-size: 14px; color: var(--ui-muted); margin-top: 4px; }
.level-grid, .set-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.catalog-card { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; min-width: 0; min-height: 270px; padding: 24px; border-radius: 20px; border: 1.5px solid var(--ui-line); background: var(--ui-surface); text-align: start; }
.catalog-card:hover { border-color: var(--brand-blue); background: var(--ui-tint); }
.catalog-number { color: var(--ui-success); font-size: 13px; font-weight: 700; }
.level-grid .catalog-number { display: flex; align-items: center; justify-content: center; width: 50px; height: 50px; border-radius: 15px; color: var(--brand-magenta); background: var(--ui-canvas); font-size: 28px; font-family: var(--ui-title-font); }
.primary-level .catalog-number { color: var(--brand-blue); }
.catalog-card > strong { font-size: 23px; line-height: 1.5; }
.catalog-description { color: var(--ui-muted); font-size: 14px; }
.catalog-progress { color: var(--ui-success); font-size: 12px; margin-top: auto; padding-top: 8px; }
.catalog-action { color: var(--brand-blue); font-size: 14px; font-weight: 700; }
.set-grid .catalog-card { min-height: 235px; }
.quick-practice { margin-top: 22px; border-top: 1px solid var(--ui-line); padding-top: 8px; }
summary { cursor: pointer; min-height: 48px; padding: 12px 6px; font-size: 14px; color: var(--brand-blue); }
summary:focus { outline: 3px solid var(--ui-focus); outline-offset: 3px; border-radius: 6px; }
summary:focus:not(:focus-visible) { outline: none; }
summary:focus-visible { outline: 3px solid var(--ui-focus); outline-offset: 3px; border-radius: 6px; }
.quick-practice > div { display: flex; flex-wrap: wrap; gap: 10px; padding: 10px 0; padding-block: 10px; }
.practice-meta-row { display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.skill-label { background: var(--ui-tint); color: var(--brand-blue); border-radius: 10px; padding: 6px 12px; font-size: 13px; }
#practice-saved { color: var(--ui-success); font-size: 13px; }
#question-list { margin: 10px 0 18px; margin-block: 10px 18px; }
#question-list summary { display: list-item; }
#practice-count { display: inline-block; margin-right: 8px; margin-inline-start: 8px; font-weight: 700; }
#question-jumps { display: flex; flex-wrap: wrap; gap: 8px; padding: 8px 0; padding-block: 8px; }
#question-jumps button { min-width: 48px; min-height: 48px; border: 1.5px solid var(--ui-line); border-radius: 12px; background: var(--ui-surface); color: var(--brand-blue); }
#question-jumps button.complete { background: var(--mint-soft); background: color-mix(in srgb, var(--brand-green) 18%, var(--ui-surface)); border-color: var(--ui-success); color: var(--ui-success); }
#question-jumps button[aria-current="step"] { outline: 3px solid var(--brand-blue); outline-offset: 2px; font-weight: 800; }
.reading-card { border: 1px solid var(--ui-line); border-right: 4px solid var(--brand-magenta); border-inline-start: 4px solid var(--brand-magenta); border-radius: 18px; background: var(--ui-surface); padding: 24px 28px; margin-bottom: 20px; }
.reading-card h2 { font-size: 15px; color: var(--brand-magenta); margin-bottom: 12px; }
.reading-card p { font-family: var(--ui-title-font); font-size: 24px; line-height: 2.2; white-space: pre-line; }
.practice-quiz .quiz-word { font-size: 56px; font-size: clamp(40px, 5vw, 70px); white-space: pre-line; }
.practice-quiz .quiz-word.long-stimulus { font-size: 30px; font-size: clamp(23px, 2.6vw, 36px); line-height: 2; }
.practice-quiz .quiz-answers { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.practice-quiz .quiz-answers.compact { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.practice-quiz .quiz-answers button { min-width: 0; min-height: 78px; font-family: var(--ui-title-font); font-size: 24px; line-height: 1.8; padding: 14px 18px; }
.practice-quiz .quiz-answers.compact button { font-size: 32px; }
.practice-match .match-source.word-source > strong { font-size: 23px; line-height: 1.9; }
.practice-match .match-target .sentence { font-size: 23px; }
.practice-match .letter-slot { max-width: 100%; white-space: normal; }
.practice-help { margin: 16px 0; margin-block: 16px; border: 1px solid var(--ui-line); background: var(--ui-tint); border-radius: 14px; padding: 2px 14px; }
.practice-help p { font-size: 16px; line-height: 2; padding: 0 4px 14px; }
.practice-navigation { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin: 18px 0; margin-block: 18px; }
.order-answer-wrap { border: 2px dashed var(--ui-muted); background: var(--ui-canvas); border-radius: 16px; padding: 14px; }
.order-answer-wrap h3 { color: var(--ui-muted); font-size: 13px; margin: 0 0 10px; font-weight: 500; }
.order-answer, .order-pool { display: flex; flex-wrap: wrap; gap: 10px; min-height: 74px; align-items: center; }
.order-pool { padding: 22px 0; padding-block: 22px; }
.order-token { min-width: 52px; min-height: 64px; max-width: 100%; border: 2px solid var(--brand-blue); border-radius: 12px; padding: 10px 18px; font-family: var(--ui-title-font); font-size: 26px; line-height: 1.9; background: var(--ui-surface); color: var(--brand-blue); }
.order-token.selected { border-color: var(--ui-success); background: var(--mint-soft); background: color-mix(in srgb, var(--brand-green) 14%, var(--ui-surface)); color: var(--ui-ink); }
.order-token:disabled { opacity: .4; }
.order-token.selected:disabled { opacity: 1; }
.order-placeholder { color: var(--ui-muted); font-size: 14px; }
.order-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
body.classroom .letter-card { min-height: 180px; }
body.classroom .letter-card .card-glyph { font-size: 80px; }
body.classroom .catalog-card { min-height: 310px; padding: 28px; }
body.classroom .catalog-card > strong { font-size: 30px; }
body.classroom .catalog-description { font-size: 19px; }
body.classroom .catalog-action, body.classroom .catalog-progress, body.classroom .guide-note p { font-size: 17px; }
body.classroom .reading-card p { font-size: 32px; }
body.classroom .order-token { min-height: 78px; font-size: 34px; }
body.classroom .practice-quiz .quiz-answers button { min-width: 0; }
@media (min-width: 2300px) {
  body.classroom .letter-card { min-height: 250px; }
  body.classroom .letter-card .card-glyph { font-size: 120px; }
  body.classroom .catalog-card { min-height: 420px; padding: 42px; }
  body.classroom .catalog-card > strong { font-size: 46px; }
  body.classroom .catalog-description, body.classroom .catalog-action, body.classroom .catalog-progress { font-size: 26px; }
  body.classroom .reading-card p { font-size: 46px; }
  body.classroom .order-token { min-height: 100px; font-size: 46px; }
  body.classroom .practice-match .match-target .sentence, body.classroom .practice-match .match-source.word-source > strong { font-size: 40px; }
}
@media (min-width: 701px) and (max-width: 1000px) {
  .letter-grid { grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 8px; }
  .letter-card .card-glyph { font-size: 50px; }
  .card-name { font-size: 14px; }
  .level-grid, .set-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  .letter-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
  .letter-card { border-radius: 15px; padding: 10px 4px; }
  .letter-card .card-glyph { font-size: 47px; line-height: 1.4; }
  .letter-card .card-order { font-size: 9px; top: 6px; right: 7px; inset-inline-start: 7px; }
  .card-name { font-size: 12px; }
  .card-steps { font-size: 9px; }
  .card-dots { gap: 3px; }
  .card-dots i { width: 13px; }
  #library-view > .mixed-card { margin-bottom: 22px; }
  .mixed-card strong { font-size: 18px; }
  .catalog-intro { margin: 22px 0 18px; margin-block: 22px 18px; }
  .catalog-intro > p:last-child { font-size: 14px; }
  .guide-note { padding: 12px 14px; }
  .guide-note strong { font-size: 13px; }
  .guide-note p { font-size: 12px; }
  .level-grid, .set-grid { grid-template-columns: 1fr; gap: 12px; }
  .catalog-card { min-height: 215px; padding: 18px; gap: 8px; }
  .catalog-card > strong { font-size: 23px; }
  .catalog-description { font-size: 14px; }
  .set-grid .catalog-card { min-height: 190px; }
  .catalog-progress { padding-top: 2px; }
  .reading-card { padding: 16px; }
  .reading-card p { font-size: 22px; }
  .practice-quiz .quiz-answers { grid-template-columns: 1fr; }
  .practice-quiz .quiz-answers button { font-size: 22px; min-height: 66px; padding: 12px; }
  .practice-quiz .quiz-answers.compact button { font-size: 27px; }
  .practice-quiz .quiz-word { font-size: 50px; }
  .practice-quiz .quiz-word.long-stimulus { font-size: 24px; }
  .practice-match .match-source.word-source > strong { font-size: 19px; }
  .practice-match .match-target .sentence { font-size: 21px; }
  .practice-match .match-target { gap: 8px; }
  .practice-match .letter-slot { flex-basis: 70px; font-size: 12px; }
  .practice-help p { font-size: 15px; }
  .practice-navigation { gap: 8px; }
  .practice-navigation .button { font-size: 12px; padding-left: 10px; padding-right: 10px; padding-inline: 10px; }
  .order-answer-wrap { padding: 10px; }
  .order-token { min-height: 56px; padding: 8px 12px; font-size: 23px; }
  .order-answer, .order-pool { gap: 8px; }
  .order-actions .button { font-size: 13px; padding-left: 12px; padding-right: 12px; padding-inline: 12px; }
  body.classroom .letter-card { min-height: 138px; }
  body.classroom .letter-card .card-glyph { font-size: 48px; }
  body.classroom .catalog-card { min-height: 230px; padding: 20px; }
  body.classroom .catalog-card > strong { font-size: 25px; }
  body.classroom .catalog-description, body.classroom .catalog-action, body.classroom .catalog-progress { font-size: 15px; }
  body.classroom .reading-card p { font-size: 25px; }
}

/* Older classroom browsers keep the same RTL layout and shared brand tokens.
   Values containing var() can fail only after substitution, so an earlier
   declaration alone is not a fallback for an unsupported color function. */
@supports not (color: color-mix(in srgb, black, white)) {
  .trace-stencil { fill: var(--ui-tint); }
  .match-target[data-matched="true"], .quiz-answers button[data-correct="true"],
  #question-jumps button.complete, .order-token.selected { background: var(--mint-soft); }
}
@supports not (color: rgb(37 54 80 / 4%)) {
  html:root { --ui-shadow: 0 4px 18px rgba(37, 54, 80, .04); }
}
/* The shared skip-link uses logical positioning. Keep it reachable on the
   route's Arabic-only, horizontal RTL layout before those properties exist. */
.ui-skip-link { top: 8px; right: 12px; }

/* learning.js measures flex layout: CSS.supports(gap) is insufficient because
   older Chromium supports grid gap but not flex gap. These margins therefore
   never supplement the gaps in a modern browser. Wrapped rows retain spacing
   on both axes; hidden controls remain hidden and create no margin boxes. */
.playground-no-flex-gap .school-brand > img { margin-left: 12px; }
.playground-no-flex-gap .display-tools > button + button { margin-right: 8px; }
.playground-no-flex-gap .button > :not([hidden]) + :not([hidden]) { margin-right: 8px; }
.playground-no-flex-gap .intro-row > * + * { margin-right: 20px; }
.playground-no-flex-gap .card-dots > i + i { margin-right: 4px; }
.playground-no-flex-gap .mixed-card > :not(:last-child) { margin-left: 24px; }
.playground-no-flex-gap .lesson-heading > * + * { margin-right: 18px; }
.playground-no-flex-gap .lesson-nav > :not(:last-child),
.playground-no-flex-gap .trace-actions > :not(:last-child),
.playground-no-flex-gap .activity-feedback > :not(:last-child),
.playground-no-flex-gap .letter-navigation > :not(:last-child),
.playground-no-flex-gap .privacy-row > :not(:last-child),
.playground-no-flex-gap .order-actions > :not(:last-child) { margin-left: 12px; }
.playground-no-flex-gap .mode-tabs > button + button { margin-right: 6px; }
.playground-no-flex-gap .activity-heading > * + * { margin-right: 16px; }
.playground-no-flex-gap .form-picker > button + button { margin-right: 10px; }
.playground-no-flex-gap .word-example > * { margin: 6px; }
.playground-no-flex-gap .match-target > * + * { margin-top: 14px; }
.playground-no-flex-gap .feedback-actions > button + button { margin-right: 8px; }
.playground-no-flex-gap .quiz-answers > button + button { margin-right: 16px; }
.playground-no-flex-gap .practice-quiz .quiz-answers > button + button { margin-right: 0; }
.playground-no-flex-gap .app-footer > * + * { margin-right: 14px; }
.playground-no-flex-gap .parent-brand > img { margin-left: 14px; }
.playground-no-flex-gap .dialog-actions > button,
.playground-no-flex-gap .quick-practice > div > button,
.playground-no-flex-gap .practice-navigation > button,
.playground-no-flex-gap .order-answer > *,
.playground-no-flex-gap .order-pool > * { margin-left: 10px; margin-bottom: 10px; }
.playground-no-flex-gap .catalog-card > :not(:last-child) { margin-bottom: 10px; }
.playground-no-flex-gap .practice-meta-row > * { margin-left: 12px; margin-bottom: 12px; }
.playground-no-flex-gap #question-jumps > button { margin-left: 8px; margin-bottom: 8px; }

@media (max-width: 700px) {
  .playground-no-flex-gap .app-header > * { margin-top: 5px; margin-bottom: 5px; }
  .playground-no-flex-gap .school-brand > img { margin-left: 9px; }
  .playground-no-flex-gap .display-tools > button + button { margin-right: 5px; }
  .playground-no-flex-gap .intro-row > * + * { margin-right: 10px; }
  .playground-no-flex-gap .mixed-card > :not(:last-child) { margin-left: 12px; }
  .playground-no-flex-gap .card-dots > i + i { margin-right: 3px; }
  .playground-no-flex-gap .lesson-heading > * + * { margin-right: 12px; }
  .playground-no-flex-gap .mode-tabs > button + button { margin-right: 2px; }
  .playground-no-flex-gap .activity-heading > * + * { margin-right: 8px; }
  .playground-no-flex-gap .form-picker > button + button { margin-right: 6px; }
  .playground-no-flex-gap .word-example > * { margin: 4px; }
  .playground-no-flex-gap .trace-actions > *,
  .playground-no-flex-gap .activity-feedback > * { margin-left: 8px; margin-bottom: 8px; }
  .playground-no-flex-gap .trace-actions > p { margin-left: 0; }
  .playground-no-flex-gap .match-target > * + * { margin-top: 12px; }
  .playground-no-flex-gap .practice-match .match-target > * + * { margin-top: 8px; }
  .playground-no-flex-gap .sentence-board .match-target > * + * { margin-top: 0; margin-right: 12px; }
  .playground-no-flex-gap .quiz-answers > button + button { margin-right: 10px; }
  .playground-no-flex-gap .practice-quiz .quiz-answers > button + button { margin-right: 0; }
  .playground-no-flex-gap .parent-brand > img { margin-left: 8px; }
  .playground-no-flex-gap .catalog-card > :not(:last-child) { margin-bottom: 8px; }
  .playground-no-flex-gap .practice-navigation > button,
  .playground-no-flex-gap .order-answer > *,
  .playground-no-flex-gap .order-pool > * { margin-left: 8px; margin-bottom: 8px; }
}