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auto;align-items:center;gap:14px;height:300px;display:grid}.thermo-scale{height:250px;color:var(--muted);flex-direction:column;justify-content:space-between;font-size:.78rem;display:flex}.thermo-track{background:#fff;border:4px solid #445552;border-radius:20px;align-items:flex-end;width:34px;height:250px;padding:4px;display:flex;overflow:hidden}.thermo-track i{background:var(--coral);border-radius:12px;width:100%;transition:height .7s}.thermometer>b{color:var(--coral);font-size:2rem}.bar-visual{border-left:3px solid var(--ink);border-bottom:3px solid var(--ink);align-items:flex-end;gap:20px;width:90%;height:280px;padding:24px 24px 42px;display:flex}.bar-visual>div{flex:1;justify-content:center;align-items:flex-end;height:100%;display:flex;position:relative}.bar-visual i{background:var(--teal);width:min(64px,80%);min-height:10px;transition:height .7s}.bar-visual b{font-size:.72rem;position:absolute;top:calc(100% + 9px)}.bar-visual span{bottom:calc(var(--bar-height,0%) + 4px);color:var(--ink);font-weight:900;position:absolute}.video-lesson{color:var(--ink);background:#fff3ef;border:1px solid #e2c9c2;border-radius:8px;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:18px;margin-bottom:16px;padding:22px;text-decoration:none;display:grid}.video-lesson:hover{border-color:var(--coral);transform:translateY(-1px)}.video-play{background:var(--coral);color:#fff;border-radius:50%;place-items:center;width:52px;height:52px;font-size:1.15rem;display:grid}.video-lesson small{color:var(--coral);text-transform:uppercase;font-size:.75rem;font-weight:900}.video-lesson h2{margin:4px 0;font-size:1.1rem}.video-lesson p{color:var(--muted);margin:0}.video-lesson>b{color:var(--coral);white-space:nowrap}.explore-block{border:1px solid var(--line);background:#e9f5ef;border-radius:8px;grid-template-columns:1fr auto;align-items:center;gap:24px;margin-bottom:16px;padding:clamp(22px,4vw,38px);display:grid}.explore-block span,.math-notes span{color:var(--teal);text-transform:uppercase;font-size:.75rem;font-weight:900}.explore-block p,.math-notes p{color:var(--muted);margin:10px 0 0;line-height:1.65}.explore-symbol{background:var(--teal);color:#fff;border-radius:50%;place-items:center;width:72px;height:72px;font-size:2.4rem;font-weight:900;display:grid}.board-lesson{border:1px solid var(--line);background:var(--paper);border-radius:8px;margin-bottom:16px;overflow:hidden}.board-intro{justify-content:space-between;align-items:center;gap:20px;padding:22px 24px;display:flex}.board-intro span,.hands-on-prompt span{color:var(--teal);text-transform:uppercase;font-size:.75rem;font-weight:900}.board-intro h2{margin:4px 0 0}.board-intro>b{max-width:34ch;color:var(--muted);text-align:right}.chalkboard{color:#fffbe8;border:12px solid #936b3e;background:#183d36;border-inline-color:#7a552f;min-height:360px;padding:34px clamp(22px,5vw,52px) 58px;font-family:Kalam,cursive;position:relative;overflow:hidden;box-shadow:inset 0 0 28px #0c2823}.chalkboard:before{content:"";pointer-events:none;opacity:.14;background-image:radial-gradient(#fff .6px,#0000 .7px);background-size:7px 7px;position:absolute;inset:0}.chalkboard p{white-space:pre-line;letter-spacing:0;text-shadow:0 0 2px #fff8;min-height:1.4em;margin:0 0 8px;font-size:clamp(1.05rem,2.4vw,1.4rem);font-weight:700;line-height:1.4;position:relative}.completed-working{color:#c8d8d2;font-size:clamp(.92rem,2vw,1.15rem)!important}.active-working{color:#fffbe8}.teacher-note{color:#f7e49b;opacity:0;border-left:3px solid #e7c85e;grid-template-columns:auto 1fr;align-items:start;gap:10px;width:min(44%,390px);padding:10px 0 10px 14px;transition:opacity .4s,transform .4s;display:grid;position:absolute;bottom:44px;right:clamp(18px,4vw,42px);transform:translateY(8px)}.teacher-note.visible{opacity:1;transform:none}.teacher-note b{font-family:Kalam,cursive;font-size:1.05rem}.teacher-note span{font-family:Kalam,cursive;font-size:clamp(.88rem,1.7vw,1rem);line-height:1.45}.board-rule{background:#e7c85e;width:72px;height:3px;position:absolute;top:22px;left:clamp(22px,5vw,52px);transform:rotate(-1deg)}.chalk-cursor{vertical-align:-.15em;background:#fffbe8;width:9px;height:1.1em;margin-left:3px;animation:.7s step-end infinite chalkBlink;display:inline-block}.chalk-tray{gap:8px;display:flex;position:absolute;bottom:7px;right:20px}.chalk-tray i{background:#fffbe8;border-radius:2px;width:30px;height:5px;transform:rotate(-3deg)}.chalk-tray i:nth-child(2){background:#e7c85e;transform:rotate(2deg)}.chalk-tray i:nth-child(3){background:#e79a87}.board-controls{border-bottom:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:8px;padding:16px 22px;display:flex}.board-controls button{border:1px solid var(--line);background:#fff;border-radius:6px;min-height:40px;padding:8px 13px;font-weight:900}.board-controls button:first-child{background:var(--teal);color:#fff}.board-controls button:disabled{opacity:.45}.board-controls span{color:var(--muted);margin-left:auto;font-size:.78rem;font-weight:800}.hands-on-prompt{background:#e9f5ef;padding:18px 22px}.hands-on-prompt p{color:var(--muted);margin:8px 0 0;line-height:1.6}@keyframes chalkBlink{50%{opacity:0}}.math-notes{grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:16px;display:grid}.math-notes>div{border:1px solid var(--line);background:var(--paper);border-radius:8px;padding:22px}.math-notes>div:last-child{border-left:5px solid var(--coral)}.practice-label{justify-content:space-between;margin-bottom:16px;display:flex}.practice-progress{background:#e7e3da;border-radius:4px;height:7px;overflow:hidden}.practice-progress i{background:var(--teal);border-radius:4px;height:100%;transition:width .35s;display:block}.guided-practice h2{max-width:28ch}.math-options{grid-template-columns:repeat(2,1fr);gap:10px;margin-top:24px;display:grid}.math-options button{border:2px solid var(--line);background:#fff;border-radius:7px;min-height:58px;padding:10px;font-weight:900}.math-options button.correct{border-color:var(--green);background:#dff1df}.math-options button.wrong{border-color:var(--coral);background:#ffe1da}.hint-button{color:var(--teal);background:0 0;border:0;margin-top:18px;font-weight:900}.hint-text{border-left:4px solid var(--gold);background:#fff9e9;margin-top:12px;padding:12px;line-height:1.55}.answer-feedback{border-radius:7px;margin-top:20px;padding:18px}.answer-feedback.success{background:#dff1df}.answer-feedback.retry{background:#ffe9df}.answer-feedback p{margin:8px 0 14px}.answer-feedback button{border:1px solid var(--line);background:#fff;border-radius:6px;margin:4px 8px 0 0;padding:9px 12px;font-weight:800}.practice-result{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:300px;display:flex}.practice-result>span{color:var(--teal);text-transform:uppercase;font-size:.76rem;font-weight:900}.practice-result>strong{color:var(--teal);margin:12px 0 4px;font-size:4rem;line-height:1}.practice-result h2{margin:10px 0 6px}.practice-result p{color:var(--muted)}.practice-result button{background:var(--teal);color:#fff;border:0;border-radius:6px;margin-top:16px;padding:11px 16px;font-weight:900}.lesson-nav{justify-content:space-between;display:flex}.lesson-nav button{border:1px solid var(--line);background:var(--ink);color:#fff;border-radius:7px;min-height:46px;padding:10px 16px;font-weight:800}.lesson-nav button:disabled{opacity:.3}@media (width<=900px){.topbar{grid-template-columns:1fr auto}.topbar nav{z-index:30;border-top:1px solid var(--line);background:var(--paper);justify-content:space-around;padding:6px;position:fixed;bottom:0;left:0;right:0}.topbar nav button{flex:1;min-width:0}main{padding-bottom:100px}.welcome,.picture-lesson{grid-template-columns:1fr}.welcome img{max-height:350px}.lesson-grid{grid-template-columns:repeat(2,1fr)}.alphabet-grid{grid-template-columns:repeat(3,1fr)}.picture-lesson>img{min-height:320px;max-height:400px}.subject-card{grid-template-rows:220px 1fr}.math-hero{grid-template-columns:1fr}.math-hero img{max-height:310px}.math-layout{grid-template-columns:1fr}.chapter-sidebar{display:flex;position:static;overflow-x:auto}.chapter-sidebar>div{min-width:180px}.chapter-sidebar>button{border-right:1px solid var(--line);min-width:230px}}@media (width<=560px){.board-intro{flex-direction:column;align-items:flex-start}.board-intro>b{text-align:left}.chalkboard{border-width:8px;min-height:390px;padding-inline:22px}.teacher-note{width:calc(100% - 40px);bottom:42px;right:20px}.board-controls span{width:100%;margin-left:0}.visual-stage{min-height:280px}.three-stage{height:300px}.factor-visual{grid-template-columns:1fr}.video-lesson{grid-template-columns:auto minmax(0,1fr)}.video-lesson>b{grid-column:2}.brand b{display:none}.topbar{min-height:62px}.topbar nav button{min-width:0;font-size:.68rem}main{width:min(100% - 20px,1180px);padding-top:18px}.welcome{min-height:0}.welcome>div{padding:28px 22px}.welcome img{max-height:240px}.home-heading{flex-direction:column;align-items:start}.lesson-grid{grid-template-columns:1fr}.lesson-card img,.lesson-icon{height:190px}.page-title{grid-template-columns:1fr}.title-symbol{display:none}.alphabet-grid{grid-template-columns:repeat(2,1fr)}.alphabet-grid article{min-height:220px}.word-card{padding:34px 18px}.word-actions{flex-direction:column;width:100%}.quiz-options,.progress-summary{grid-template-columns:1fr}.quiz-options button{min-height:82px}.subject-grid{grid-template-columns:1fr}.subject-card{grid-template-rows:190px 1fr}.math-topbar>div>span{display:none}.math-main{width:min(100% - 20px,1280px)}.math-hero>div{padding:26px 20px}.math-overview{flex-direction:column;gap:8px}.model-0{grid-template-columns:repeat(2,1fr)}.model-1,.model-2,.math-options,.math-notes{grid-template-columns:1fr}.explore-symbol{display:none}}