:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#182a46;background:#f3f6fb;font-synthesis:none;--blue:#254bbd;--muted:#607089;--line:#dce3ee}*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #e3a721;outline-offset:4px}button:disabled{opacity:.38;cursor:default}[hidden]{display:none!important}.topbar{height:92px;background:#fff;border-bottom:1px solid var(--line);padding:0 max(28px,calc((100vw - 1200px)/2));display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:13px;color:#182a46;text-decoration:none;font-size:23px;font-weight:750;letter-spacing:-.6px}.brand-mark{display:grid;place-items:center;width:43px;height:43px;border-radius:12px;background:var(--blue);color:#fff;font-family:Georgia,serif;font-size:29px;font-weight:400}.class-label{font-size:12px;letter-spacing:1.8px;font-weight:700;color:#54637a}.class-label span{margin:0 10px;color:#a5b0c2}.layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:54px;max-width:1200px;margin:40px auto;padding:0 20px}.collection{padding:7px 0}.collection-heading{display:flex;align-items:center;gap:12px}h1{font-size:21px;letter-spacing:-.5px;margin:0}.count{font-size:12px;border:1px solid #cbd6e7;padding:3px 7px;border-radius:6px;color:#526480}.muted{font-size:14px;color:var(--muted);margin:10px 0 28px}.group-label{font-size:12px;text-transform:uppercase;letter-spacing:1.5px;color:#66768d;margin:22px 0 10px;font-weight:700}.exercise-item{display:flex;align-items:center;gap:13px;width:100%;border:1px solid transparent;color:#53617a;background:transparent;padding:9px 12px;text-align:left;border-radius:9px;font-size:14px;margin:2px 0;min-height:38px}.exercise-item:hover{background:#e8eef9}.exercise-item[aria-current=true]{background:#e3ebff;border-color:#c8d7fb;color:#203f9b;font-weight:700}.item-number{font-size:12px;color:inherit;opacity:.75;font-variant-numeric:tabular-nums;width:21px}.item-marker{margin-left:auto;font-size:13px}.collection-note{border-top:1px solid var(--line);padding-top:20px;margin-top:24px;font-size:14px;color:var(--muted);line-height:1.7}.section-line{display:flex;justify-content:space-between;align-items:center;margin:9px 0 19px;gap:12px;font-size:12px;letter-spacing:1.6px;color:#5d6d86;font-weight:700}.section-line span:last-child{letter-spacing:0;font-weight:400;font-size:14px}.exercise-card{background:#fff;border:1px solid #dce4ef;border-radius:20px;overflow:hidden;box-shadow:0 9px 30px #24345206}.exercise-heading{text-align:center;padding:35px 28px 23px}.tag{display:inline-block;background:#edf2fe;color:#3355a5;padding:6px 11px;border-radius:6px;font-size:12px;font-weight:650;letter-spacing:.2px}.exercise-heading h1{font-family:Georgia,"Times New Roman",serif;font-size:42px;font-weight:400;letter-spacing:-1.4px;margin:16px 0 11px}.exercise-heading p{font-size:16px;color:var(--muted);line-height:1.6;margin:0}.player{text-align:center;padding:4px 34px 25px}.play-button{display:inline-flex;align-items:center;justify-content:center;gap:12px;border:none;background:var(--blue);color:#fff;padding:17px 26px;min-width:209px;border-radius:12px;font-weight:650;box-shadow:0 5px 12px #254bbd20}.play-button:hover{background:#183a9f}#play-symbol{font-size:15px;width:18px}.replay-button{padding:15px 18px;border:none;background:transparent;color:#4e6080;font-size:14px}.replay-button:hover{color:var(--blue);text-decoration:underline}.audio-progress{display:flex;align-items:center;gap:14px;max-width:390px;margin:23px auto 0}progress{height:5px;width:100%;border:0;border-radius:5px;overflow:hidden;background:#e5eaf3;accent-color:var(--blue)}progress::-webkit-progress-bar{background:#e5eaf3}progress::-webkit-progress-value{background:var(--blue)}progress::-moz-progress-bar{background:var(--blue)}#time{font-size:12px;font-variant-numeric:tabular-nums;white-space:nowrap;color:#738198}.audio-caption{font-size:12px;color:#6b7890;margin:11px 0 0;min-height:18px}.solution-area{margin:0 34px 26px;text-align:center;border:1px solid #e0e7f0;border-radius:12px;padding:28px 25px;background:repeating-linear-gradient(#f9fbff,#f9fbff 31px,#e9eef7 32px);min-height:215px;display:flex;flex-direction:column;align-items:center;justify-content:center}.small-label{font-size:11px;font-weight:700;letter-spacing:1.5px;color:#687996}#hidden-solution p{color:#697992;font-size:16px;line-height:1.7;margin:13px 0 19px}#solution{font-family:Georgia,"Times New Roman",serif;font-size:25px;line-height:1.6;margin:0 0 21px;color:#213a63}.reveal-button{border:1px solid #becce2;background:#fff;color:#284677;border-radius:8px;padding:10px 17px;font-size:14px;font-weight:600}.reveal-button:hover{background:#edf3ff}.exercise-nav{border-top:1px solid #e5eaf2;display:flex;justify-content:space-between;align-items:center;padding:20px 27px;gap:12px}.exercise-nav button{background:transparent;border:none;padding:8px;color:#33568b;font-size:14px;font-weight:600}.exercise-nav button:hover:not(:disabled){color:#173ba9}#nav-count{font-size:12px;color:#738198;white-space:nowrap}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:29px 5px}.steps>div{display:flex;gap:12px}.steps>div>span{flex-shrink:0;width:26px;height:26px;border-radius:50%;border:1px solid #ced9eb;display:grid;place-items:center;color:#50699a;font-size:12px}.steps p{margin:3px 0 0;font-size:13px;color:#6a7991;line-height:1.8}.steps strong{display:block;font-size:14px;color:#35496b;font-weight:650;margin-bottom:1px}footer{text-align:center;color:#738099;font-family:Georgia,serif;font-style:italic;font-size:14px;margin:38px 0 20px}@media(min-width:1500px){.layout{margin-top:55px}}@media(max-width:900px){.layout{gap:25px;grid-template-columns:210px minmax(0,1fr)}.exercise-heading h1{font-size:36px}.player{padding-inline:20px}.solution-area{margin-inline:20px}.steps{gap:10px}.steps>div{gap:8px}}@media(max-width:650px){.topbar{height:auto;min-height:80px;padding:17px 20px;flex-wrap:wrap;gap:14px}.brand{font-size:21px}.class-label{font-size:11px;letter-spacing:1px}.layout{display:flex;flex-direction:column;margin:22px auto;padding:0 16px;gap:22px}.collection-heading h1{font-size:18px}.collection .muted{margin-bottom:17px}.group-label{margin:14px 0 8px}.exercise-group{display:flex;flex-wrap:wrap;gap:5px}.exercise-item{width:auto;margin:0;padding:9px 11px;border-color:#dbe3ef;background:#fff;gap:0}.exercise-item .item-number,.item-marker{display:none}.collection-note{display:none}.section-line{margin-top:0}.exercise-heading{padding:26px 17px 20px}.exercise-heading h1{font-size:34px}.exercise-heading p{font-size:15px}.solution-area{margin-inline:16px;padding:23px 14px}#solution{font-size:23px}.exercise-nav{padding:14px 9px;gap:4px}.exercise-nav button{font-size:13px;padding:9px 4px}.steps{gap:12px;margin-inline:0}.steps>div{display:block}.steps p{font-size:12px}.steps strong{font-size:13px}footer{margin-top:25px}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s,color .15s}}

/* Tablet writing workspace */
html { -webkit-text-size-adjust: 100%; }
body { padding-bottom: env(safe-area-inset-bottom); }
button, select, summary { touch-action: manipulation; }
button, select { min-height: 44px; }
.compact-picker { display: none; }
.layout { gap: 30px; grid-template-columns: 225px minmax(0, 1fr); max-width: 1320px; margin-top: 25px; }
.collection { position: sticky; top: 20px; align-self: start; max-height: calc(100dvh - 40px); overflow-y: auto; padding-right: 8px; }
.exercise-heading { padding: 22px 24px 14px; }
.exercise-heading h1 { font-size: 34px; margin: 10px 0 6px; }
.player { padding: 0 28px 18px; }
.audio-progress { margin-top: 15px; }
.writing-area { margin: 0 28px 22px; }
.writing-heading { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.writing-heading h3 { margin: 0; font-size: 19px; }
.writing-heading span { font-size: 12px; letter-spacing: 1px; color: #617392; }
#writing-help { font-size: 14px; color: var(--muted); line-height: 1.5; margin: 9px 0 14px; }
.ink-paper { border: 1px solid #b8c9e3; border-radius: 10px; overflow: hidden; background-color: #fcfdff; background-image: linear-gradient(to bottom, transparent calc(100% - 1px), #ccd9ed 1px); background-size: 100% 20%; }
#ink { display: block; width: 100%; height: auto; aspect-ratio: 2 / 1; touch-action: none; user-select: none; -webkit-user-select: none; -webkit-touch-callout: none; cursor: crosshair; }
.ink-toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 16px; margin: 5px 0 13px; }
.ink-toolbar button { background: transparent; border: none; color: #33568b; font-size: 14px; padding: 8px 0; }
.ink-toolbar span { margin-left: auto; font-size: 12px; color: #63758f; }
.writing-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 20px; }
.check-button { background: #254bbd; color: white; border: none; padding: 13px 20px; border-radius: 9px; font-weight: 650; }
.check-button:hover { background: #193a9b; }
.field-note { font-size: 13px; line-height: 1.6; color: #5c6e88; margin: 10px 0; }
.recognition-panel { margin-top: 18px; border: 1px solid #d4deec; border-radius: 9px; padding: 0 16px 14px; }
.recognition-panel:not([open]) { padding-bottom: 0; }
.recognition-panel summary { cursor: pointer; padding: 15px 0; color: #294c85; font-size: 15px; line-height: 1.5; }
.recognition-panel label { display: block; font-weight: 650; font-size: 15px; margin: 4px 0 10px; }
#answer { width: 100%; resize: vertical; min-height: 135px; max-height: 500px; padding: 14px 16px; font-family: inherit; font-size: 21px; line-height: 1.7; color: #172b4d; border: 1px solid #bccce4; border-radius: 8px; background: white; }
#answer:focus-visible, select:focus-visible, summary:focus-visible { outline: 3px solid #e3a721; outline-offset: 3px; }
#answer::placeholder { color: #6c7e99; font-size: 17px; }
#check-message:empty { display: none; }
#check-message { font-size: 15px; color: #354d77; }
.feedback { border: 1px solid #d9c190; background: #fffcf4; border-radius: 12px; padding: 22px; margin-top: 18px; }
.feedback.is-correct { border-color: #aad5c0; background: #f0faf5; }
.feedback h3 { margin: 0 0 9px; font-size: 22px; }
.feedback p { font-size: 16px; line-height: 1.6; margin: 7px 0; overflow-wrap: anywhere; }
.feedback ol { padding-left: 24px; }
.feedback li { margin: 16px 0; padding-left: 4px; }
.feedback li strong { font-size: 15px; }
.feedback li small { display: block; color: #66738a; font-size: 13px; overflow-wrap: anywhere; }
#corrected-answer { border-top: 1px solid #dfd4b9; margin-top: 20px; padding-top: 4px; }
#corrected-answer h4 { margin: 15px 0 8px; font-size: 14px; }
#expected-text { font-family: Georgia, serif; font-size: 22px; }
.solution-area { margin: 0 28px 20px; min-height: 0; padding: 18px; background: #f8faff; }
#hidden-solution p { display: none; }
.small-label { font-size: 12px; }
#hidden-solution { margin-bottom: 10px; }
@media (max-width: 1180px) {
  .topbar { height: 70px; min-height: 70px; padding: 12px 25px; }
  .layout { display: block; max-width: 1000px; margin: 20px auto; padding: 0 24px; }
  .collection { display: none; }
  .compact-picker { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
  .compact-picker label { font-size: 15px; font-weight: 650; white-space: nowrap; }
  .compact-picker select { width: 100%; min-width: 0; border: 1px solid #bdcbe3; border-radius: 9px; background: white; color: #254677; font: inherit; padding: 10px 14px; min-height: 48px; }
  .section-line { margin: 0 0 13px; }
  .exercise-heading { padding: 17px 22px 12px; }
  .exercise-heading h1 { font-size: 30px; }
  .steps { margin: 22px 5px; }
}
@media (min-width: 700px) and (max-height: 850px) {
  .topbar { height: 60px; min-height: 60px; }
  .layout { margin-top: 14px; }
  .compact-picker { margin-bottom: 10px; }
  .section-line { margin-bottom: 9px; }
  .exercise-heading { text-align: left; display: flex; align-items: center; flex-wrap: wrap; gap: 10px 16px; padding: 14px 28px 10px; }
  .exercise-heading h1 { margin: 0; font-size: 27px; }
  .exercise-heading p { display: none; }
  .player { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 16px; padding-bottom: 12px; text-align: left; }
  .play-button { min-width: 180px; padding: 12px 18px; }
  .replay-button { padding: 10px; }
  .audio-progress { flex: 1; margin: 0; min-width: 130px; }
  .audio-caption { width: 100%; margin-top: 2px; }
  .writing-area { margin-bottom: 16px; }
}
@media (max-width: 650px) {
  .topbar { padding: 14px 18px; height: auto; }
  .layout { padding: 0 12px; margin-top: 16px; }
  .compact-picker { gap: 10px; }
  .compact-picker label { font-size: 14px; }
  .writing-area { margin: 0 16px 20px; }
  .writing-heading span { font-size: 12px; }
  .solution-area { margin-inline: 16px; }
  .ink-toolbar { gap: 4px 16px; }
  .ink-toolbar span { margin-left: 0; width: 100%; }
  .feedback { padding: 17px; }
  .exercise-nav button { font-size: 14px; }
}
.training-picker{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:18px}.training-picker label{display:block;font-size:14px;font-weight:650;margin-bottom:7px;color:#3d526f}.training-picker select{width:100%;min-width:0;min-height:48px;background:#fff;border:1px solid #bdcbe3;border-radius:9px;padding:10px 12px;color:#254677;font:inherit}.training-picker>div{min-width:0}.privacy-note{max-width:700px;margin:20px auto;text-align:left;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-style:normal;font-size:13px;line-height:1.6}.privacy-note summary{cursor:pointer;min-height:44px;padding:10px 0;text-align:center}.privacy-note a{color:#254bbd}@media(max-width:430px){.training-picker{grid-template-columns:1fr;gap:10px}}

/* One exercise at a time on desktop and tablet. */
.layout { display: block; max-width: 1000px; margin: 25px auto; }
.workspace { min-width: 0; }
.exercise-card { scroll-margin-top: 20px; }
.exercise-nav { padding: 18px 28px; }
.exercise-nav #next { background: var(--blue); color: #fff; border-radius: 9px; padding: 13px 20px; font-size: 15px; }
.exercise-nav #next:hover:not(:disabled) { background: #193a9b; color: #fff; }
@media (max-width: 650px) {
  .layout { margin-top: 16px; }
  .exercise-nav { padding: 14px 16px; gap: 8px; flex-wrap: wrap; }
  .exercise-nav #next { padding: 12px 14px; font-size: 14px; }
}

/* Prevent palm/Pencil text selection in the interface, but keep editing usable. */
body, body * { -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }
textarea, input, [contenteditable="true"], [contenteditable="true"] * {
  -webkit-user-select: text; user-select: text; -webkit-touch-callout: default;
}
.writing-hand { display: flex; align-items: center; gap: 10px; }
.writing-hand label { font-size: 14px; color: #536984; }
.writing-hand select { font: inherit; color: #254677; background: #fff; border: 1px solid #bdcbe3; border-radius: 9px; padding: 8px 12px; }
.ink-toolbar { justify-content: flex-end; gap: 12px; margin: 0 0 10px; }
.ink-toolbar button { padding: 8px 14px; border: 1px solid #d5dfed; border-radius: 9px; background: #f8faff; }
.ink-board { padding: 14px 14px 40px clamp(32px, 6vw, 64px); border-radius: 14px; background: #edf2f9; touch-action: none; overscroll-behavior: none; }
.ink-paper { touch-action: none; }
.writing-area[data-hand="right"] .ink-board { padding-left: 14px; padding-right: clamp(32px, 6vw, 64px); }
.writing-area[data-hand="right"] .ink-toolbar { justify-content: flex-start; }
.writing-area[data-hand="left"] .writing-actions { justify-content: flex-end; }
#palm-help { margin: 9px 0 16px; }
@media (max-width: 650px) {
  .writing-hand { gap: 8px; }
  .ink-board { padding-bottom: 30px; }
}
.ink-toolbar button[aria-pressed="true"] { background: #254bbd; border-color: #254bbd; color: #fff; }
#ink[data-tool="eraser"] { cursor: cell; }
#tool-help { margin-top: 0; }

/* Independent content and handwriting feedback share the same task workflow. */
.training-picker { grid-template-columns: repeat(3, minmax(0, 1fr)); }
#handwriting-feedback { background: #f5f4fc; border-color: #ddd7ef; }
#handwriting-criteria, #handwriting-tips { padding-left: 22px; line-height: 1.5; }
#handwriting-criteria p { margin: 4px 0 14px; }
#handwriting-tips { font-weight: 600; }
#learning-status { line-height: 1.6; color: #355174; }
#continue-practice { border: 1px solid #bccce4; border-radius: 9px; padding: 12px 16px; }
#answer-choice { width: 100%; font: inherit; padding: 12px; }
#check { margin-top: 8px; }
@media(max-width:650px) { .training-picker { grid-template-columns: 1fr; } }

.exercise-heading #task-prompt { display: block; white-space: pre-line; }

.learning-gate { margin: 0 24px 18px; padding: 14px 18px; background: #edf3ff; border-radius: 10px; }
.learning-gate #learning-status { margin: 0; }