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var(--safe-right)) 12px max(16px, var(--safe-left));flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 12px;margin:0 auto;display:flex}.topbar-home{border-radius:12px;align-items:center;min-height:44px;text-decoration:none;display:inline-flex}.topbar-right{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:4px 8px;display:flex}.logout{align-items:center;gap:6px;display:inline-flex}.logout-name{color:var(--muted);font-size:.9rem}.page{max-width:1100px;padding:8px max(16px, var(--safe-right)) calc(48px + var(--safe-bottom)) max(16px, var(--safe-left));flex-direction:column;gap:24px;margin:0 auto;display:flex}.page.narrow{max-width:680px}.shell.teacher .page{max-width:var(--page-max);padding-left:max(var(--page-pad), var(--safe-left));padding-right:max(var(--page-pad), var(--safe-right));gap:20px}.shell.teacher .page.narrow{max-width:760px}.section{flex-direction:column;gap:14px;display:flex}.section-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.back-link{min-height:48px;color:var(--accent-strong);align-self:flex-start;align-items:center;gap:6px;padding:0 8px 0 0;font-weight:600;text-decoration:none;display:inline-flex}.hello{margin-top:8px;font-size:2.3rem}.login{min-height:100dvh;padding:calc(24px + var(--safe-top)) max(20px, var(--safe-right)) calc(24px + var(--safe-bottom)) max(20px, var(--safe-left));place-items:center;display:grid}.login-card{text-align:center;flex-direction:column;align-items:center;gap:18px;width:min(460px,100%);display:flex}.login-school{color:var(--muted);margin-top:-4px;font-size:1.1rem;font-weight:600}.login-lead{color:var(--muted);margin-bottom:18px;font-size:1.2rem}.login-button{width:100%;min-height:68px;font-size:1.25rem}.login-note{color:var(--muted)}.login-demo{color:var(--muted);margin-top:12px;font-size:.95rem}.login-demo .link-button{font-size:.95rem}.login .notice{text-align:left;width:100%}.dev-link{color:var(--muted);margin-top:24px;font-size:.8rem}.breadcrumb{color:var(--muted);flex-wrap:wrap;align-items:center;gap:0 4px;font-size:.92rem;display:flex}.crumb{align-items:center;gap:4px;display:inline-flex}.crumb a{min-height:44px;color:var(--accent-strong);align-items:center;padding:0 4px;font-weight:600;text-decoration:none;display:inline-flex}.crumb a:hover{text-decoration:underline}.crumb-sep{color:var(--line-strong)}.badge{background:var(--accent-2-soft);color:var(--accent-2-strong);border:1px solid color-mix(in srgb, var(--accent-2) 35%, transparent);vertical-align:2px;border-radius:999px;margin-left:8px;padding:1px 8px;font-size:.75rem;font-weight:700;display:inline-block}.assignment-list{flex-direction:column;gap:14px;display:flex}.assignment-card{border-radius:var(--radius);background:var(--surface);border:2px solid color-mix(in srgb, var(--accent) 45%, var(--line));box-shadow:var(--shadow);flex-wrap:wrap;align-items:center;gap:16px 20px;padding:18px 20px;display:flex}.assignment-info{flex-direction:column;flex:240px;gap:4px;min-width:0;display:flex}.assignment-info h3{overflow-wrap:anywhere;font-size:1.3rem}.assignment-place{color:var(--muted);font-size:.85rem;font-weight:600}.assignment-meta{color:var(--muted)}.assignment-note{color:var(--muted);font-style:italic}@media (width<=599px){.assignment-card .button{width:100%}}.done-list{flex-direction:column;gap:2px;margin:0;padding:0;list-style:none;display:flex}.done-list li{color:var(--muted);align-items:center;gap:10px;min-height:44px;display:flex}.done-title{flex:1;min-width:0}.block-stand{color:var(--muted);flex-wrap:wrap;align-items:center;gap:4px 10px;font-size:.88rem;display:inline-flex}.block-stand.untouched{color:var(--muted);font-style:italic}.block-stand.large{gap:6px 14px;font-size:1rem}.stand-dots{gap:4px;display:inline-flex}.stand-dot{border:2px solid var(--accent-2);border-radius:50%;width:12px;height:12px}.stand-dot.on{background:var(--accent-2)}.block-stand.large .stand-dot{width:16px;height:16px}.stand-level{color:var(--ink);font-weight:650}.stand-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 18px}.chapter-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px;display:grid}@media (width<=600px){.chapter-grid{grid-template-columns:1fr}}.chapter-tile{border-radius:var(--radius);background:var(--surface);border:2px solid var(--line);min-height:88px;box-shadow:var(--shadow);color:var(--ink);grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px;padding:14px 16px;text-decoration:none;transition:transform 80ms,border-color .15s;display:grid}a.chapter-tile:active{border-color:var(--accent);transform:scale(.98)}@media (hover:hover){a.chapter-tile:hover{border-color:var(--accent)}}.chapter-tile.muted-tile{opacity:.6;box-shadow:none;background:0 0;border-style:dashed}.chapter-tile.muted-tile .chapter-number{background:var(--surface-2);color:var(--muted)}.chapter-number{background:var(--accent-2-soft);width:56px;height:56px;color:var(--accent-2-strong);border-radius:14px;flex:none;place-items:center;font-size:1.7rem;font-weight:800;display:grid}.chapter-number.large{border-radius:18px;width:72px;height:72px;font-size:2.2rem}.chapter-text{flex-direction:column;gap:2px;min-width:0;display:flex}.chapter-title{overflow-wrap:anywhere;font-size:1.15rem;font-weight:700}.chapter-sub{color:var(--muted);font-size:.9rem}.chapter-chevron{color:var(--muted)}.chapter-head{align-items:center;gap:16px;display:flex}.chapter-head h1{font-size:1.9rem}.section-list{flex-direction:column;gap:10px;display:flex}.section-item{border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);overflow:hidden}.section-item>summary{cursor:pointer;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:12px;min-height:60px;padding:10px 16px;list-style:none;display:grid}.section-item>summary::-webkit-details-marker{display:none}.section-item>summary:after{content:"›";color:var(--muted);grid-column:4;font-size:1.5rem;transition:transform .15s}.section-item[open]>summary:after{transform:rotate(90deg)}.section-item[open]>summary{border-bottom:1px solid var(--line)}.section-number{color:var(--accent-2);align-items:center;min-width:2.2em;font-weight:800;display:inline-flex}.section-title{overflow-wrap:anywhere;font-size:1.08rem;font-weight:700}.section-count{color:var(--muted);white-space:nowrap;font-size:.88rem}.block-list{flex-direction:column;gap:4px;margin:0;padding:6px;list-style:none;display:flex}.block-row{border-radius:12px;align-items:center;gap:10px;display:flex}.block-row-main{min-width:0;min-height:56px;color:var(--ink);border-radius:12px;flex-direction:column;flex:1;gap:4px;padding:8px 10px;text-decoration:none;display:flex}a.block-row-main:active{background:var(--surface-2)}@media (hover:hover){a.block-row-main:hover{background:var(--surface-2)}}.block-row-title{overflow-wrap:anywhere;font-weight:600}.block-row.disabled{opacity:.6}.block-row-go{flex:none;margin-right:6px}.block-title{margin-top:4px;font-size:1.9rem}.block-description{color:var(--muted);font-size:1.1rem}.topic-start{flex-direction:column;align-items:flex-start;gap:10px;display:flex}.practice-button{min-width:min(320px,100%);min-height:68px;font-size:1.35rem}@media (width<=599px){.practice-button{width:100%}}.level-choice{border:none;flex-direction:column;gap:10px;min-width:0;margin:0;padding:0;display:flex}.level-choice-label{margin-bottom:10px;padding:0;font-size:1.15rem;font-weight:700}.level-options{grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;display:grid}.level-option{border:3px solid var(--line);background:var(--surface);min-height:64px;color:var(--ink);text-align:left;border-radius:16px;flex-direction:column;align-items:flex-start;gap:4px;padding:12px 16px;display:flex}.level-option:active{transform:scale(.98)}.level-option{--lv:var(--accent);--lv-strong:var(--accent-strong);--lv-soft:var(--accent-soft)}.level-option.l2{--lv:color-mix(in srgb, var(--accent-2) 65%, var(--surface));--lv-strong:var(--accent-2);--lv-soft:var(--accent-2-soft)}.level-option.l3{--lv:var(--accent-2);--lv-strong:var(--accent-2-strong);--lv-soft:var(--accent-2-soft)}.level-option:before{content:"";background:var(--lv);border-radius:2px;width:28px;height:4px;margin-bottom:2px;display:block}.level-option.selected{border-color:var(--lv);background:var(--lv-soft);box-shadow:0 0 0 3px color-mix(in srgb, var(--lv) 22%, transparent)}.level-option-head{justify-content:space-between;align-items:center;gap:8px;width:100%;display:flex}.level-option-name{text-transform:capitalize;font-size:1.3rem;font-weight:800}.level-option.selected .level-option-name{color:var(--lv-strong)}.level-option-done{color:var(--accent-2);display:inline-flex}.level-option-text{color:var(--muted);overflow-wrap:anywhere;font-size:.92rem;line-height:1.3}.level-choice.compact .level-options{grid-template-columns:repeat(auto-fit,minmax(96px,1fr))}.level-choice.compact .level-option{align-items:center;min-height:52px}@media (width<=599px){.level-options{grid-template-columns:1fr}.level-option{min-height:56px}}.level-start{padding-top:calc(12px + var(--safe-top));gap:18px}.level-info{color:var(--muted);flex-direction:column;gap:4px;margin:0;padding-left:1.2em;display:flex}.level-info strong{color:var(--ink);text-transform:capitalize}.player{z-index:10;background:var(--bg);height:100dvh;padding:var(--safe-top) var(--safe-right) 0 var(--safe-left);flex-direction:column;display:flex;position:fixed;inset:0}.player-top{border-bottom:1px solid var(--line);background:var(--surface);grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:12px;padding:6px 16px;display:grid}.quit-button{color:var(--muted);justify-self:start;padding:0 12px 0 6px}.player-title{color:var(--muted);text-align:right;text-overflow:ellipsis;white-space:nowrap;justify-self:end;max-width:100%;font-size:.9rem;overflow:hidden}.player-progress{flex-direction:column;align-items:center;gap:4px;display:flex}.progress-dots{flex-wrap:wrap;justify-content:center;gap:6px;max-width:320px;display:flex}.dot{background:var(--line);border-radius:50%;width:12px;height:12px;transition:background-color .2s,transform .2s}.dot.done{background:var(--accent)}.progress-text{color:var(--muted);font-size:.85rem}.player-body{flex-direction:column;flex:1;min-height:0;display:flex}.player-main{overscroll-behavior:contain;flex-direction:column;flex:1;gap:16px;width:100%;max-width:820px;min-height:0;margin:0 auto;padding:18px 16px 24px;display:flex;overflow-y:auto}.player-dock{padding:10px 16px calc(12px + var(--safe-bottom));border-top:1px solid var(--line);background:var(--surface);flex-direction:column;flex:none;align-items:center;gap:10px;display:flex}.player-dock>.check-button{width:100%;max-width:480px}.check-button{min-height:60px;font-size:1.25rem}@media (width>=900px) and (orientation:landscape),(width>=640px) and (height<=620px) and (orientation:landscape){.player-main{padding:24px 28px}.player:not(.with-pad) .player-dock{flex-direction:row;justify-content:center}.player.with-pad .player-body{flex-direction:row}.player.with-pad .player-dock{border-top:0;border-left:1px solid var(--line);width:380px;padding:20px 24px calc(20px + var(--safe-bottom));justify-content:flex-end}.player.with-pad .dock-bar{flex-direction:column;align-items:stretch}.player.with-pad .dock-status{flex:none}.player.with-pad .dock-bar .check-button{width:100%;min-width:0}.player.with-pad .dock-suggest{flex:none;justify-content:stretch}.player.with-pad .suggest-actions{flex-direction:column-reverse;width:100%}.player.with-pad .suggest-actions .button{width:100%}}.task-intro{padding:4px 0}.step-box{border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);flex-direction:column;gap:14px;padding:16px 18px;display:flex}.step-box.current{border:2px solid color-mix(in srgb, var(--accent) 40%, var(--line));box-shadow:var(--shadow)}.step-box.past{opacity:.92}.step-head{flex-wrap:wrap;align-items:center;gap:4px 12px;display:flex}.step-number{width:100%;color:var(--accent-strong);text-transform:uppercase;letter-spacing:.04em;font-size:.85rem;font-weight:700}.step-instruction{overflow-wrap:anywhere;flex:260px;font-size:1.4rem;font-weight:700;line-height:1.3}.step-box.past .step-instruction{font-size:1.15rem}.hint-button{color:var(--hint);padding:0 12px 0 8px}.level-chip{white-space:nowrap}.level-chip.changed{color:var(--accent-strong);font-weight:700;animation:.4s chip-in}@keyframes chip-in{0%{opacity:0}to{opacity:1}}@media (prefers-reduced-motion:reduce){.level-chip.changed{animation:none}}.note-line{background:var(--surface-2);color:var(--ink);overflow-wrap:anywhere;border-radius:12px;align-items:flex-start;gap:10px;padding:10px 14px;scroll-margin-bottom:16px;font-size:1.05rem;line-height:1.4;display:flex}.note-line>svg{color:var(--muted);flex:none;margin-top:2px}.note-line.hint>svg{color:var(--hint)}.note-line.way>svg{color:var(--accent)}.step-box.past .note-line{font-size:.95rem}.dock-bar{flex-wrap:wrap;align-items:center;gap:10px 16px;width:100%;max-width:820px;display:flex}.dock-status{flex:240px;align-items:flex-start;gap:10px;min-width:0;min-height:28px;font-size:1.05rem;line-height:1.35;display:flex}.dock-status:empty{min-height:0}.dock-icon{flex:none;margin-top:1px}.dock-text{overflow-wrap:anywhere;flex:1 1 0;min-width:0}.dock-status.tone-good{color:var(--good);align-items:center;font-weight:700}.dock-status.tone-good .dock-text{flex:0 auto}.dock-status.tone-error .dock-icon{color:var(--bad)}.dock-status.tone-remark .dock-icon{color:var(--hint)}.dock-status.tone-info,.dock-status.tone-info .dock-icon,.dock-status.tone-solution .dock-icon{color:var(--muted)}.dock-status.tone-solution{font-weight:650}.way-toggle{color:var(--accent-strong);min-height:44px;font-size:.95rem;font-weight:600}.dock-bar .check-button{flex:none;min-width:240px;max-width:100%}.dock-bar:has(.dock-status:empty){justify-content:center}.dock-bar:has(.dock-status:empty) .check-button{flex:auto;max-width:480px}.dock-suggest{flex-wrap:wrap;flex:360px;justify-content:flex-end;align-items:center;gap:8px 10px;display:flex}.suggest-question{font-size:1.05rem;font-weight:650}.suggest-actions{flex-wrap:wrap;gap:8px;display:flex}.suggest-actions .button{border-radius:14px;min-height:52px;font-size:1.05rem}@media (width<=599px){.player-top{grid-template-columns:auto 1fr;padding:4px 10px}.player-title{display:none}.player-progress{align-items:flex-end}.dot{width:10px;height:10px}.player-main{gap:12px;padding:12px 10px 18px}.step-box{padding:12px}.step-instruction,.ct-text{font-size:1.2rem}.player-dock{padding:8px 10px calc(10px + var(--safe-bottom));gap:8px}.dock-bar{flex-direction:column;align-items:stretch;gap:8px}.dock-status{flex:none;font-size:1rem}.dock-bar .check-button{width:100%;min-width:0}.dock-suggest{flex:none;justify-content:stretch}.suggest-actions .button{flex:140px}}.number-pad{grid-template-columns:repeat(4,1fr);gap:8px;width:100%;max-width:480px;display:grid}.pad-key{border:2px solid var(--line);background:var(--surface);min-height:56px;color:var(--ink);font-variant-numeric:tabular-nums;border-bottom-width:4px;border-radius:14px;place-items:center;font-size:1.7rem;font-weight:600;transition:transform 60ms,background-color 60ms,border-bottom-width 60ms;display:grid}.pad-key:active:not(:disabled){background:var(--accent-soft);border-bottom-width:2px;border-color:var(--accent);transform:translateY(2px)scale(.96)}.pad-key:disabled{opacity:.4}.pad-key-back{background:var(--surface-2);color:var(--muted)}.pad-spacer{display:block}.pad-go{white-space:nowrap;border-radius:14px;gap:4px;min-width:0;min-height:44px;padding:0 14px;font-size:1.2rem}.pad-go>svg{flex:none;margin-right:-4px}.number-pad{grid-template-areas:"k1 k2 k3 kb""k4 k5 k6 kb""k7 k8 k9 kc""k0 kg kg kg"}.number-pad.signed{grid-template-areas:"k1 k2 k3 kb""k4 k5 k6 km""k7 k8 k9 kc""k0 kg kg kg"}.number-pad .pad-go{grid-area:kg}.number-pad .pk-0{grid-area:k0}.number-pad .pk-1{grid-area:k1}.number-pad .pk-2{grid-area:k2}.number-pad .pk-3{grid-area:k3}.number-pad .pk-4{grid-area:k4}.number-pad .pk-5{grid-area:k5}.number-pad .pk-6{grid-area:k6}.number-pad .pk-7{grid-area:k7}.number-pad .pk-8{grid-area:k8}.number-pad .pk-9{grid-area:k9}.number-pad .pk-back{grid-area:kb}.number-pad .pk-comma{grid-area:kc}.number-pad .pk-minus{grid-area:km}.number-pad.compact{grid-template-columns:repeat(7,1fr);grid-template-areas:"k1 k2 k3 k4 k5 kb kb""k6 k7 k8 k9 k0 kg kg";max-width:560px}.number-pad.compact .pk-comma{display:none}.number-pad.term-pad{grid-template-columns:repeat(3,1fr) repeat(3,1fr) 1fr;grid-template-areas:"t7 t8 t9 tpl tmi tlp tbk""t4 t5 t6 tmu tdv trp tsq""t1 t2 t3 v0 v1 tfr teq""tco t0 t0 v2 v3 tgo tgo";max-width:620px}.term-pad .pad-go{grid-area:tgo}.number-pad.term-pad.few-vars{grid-template-areas:"t7 t8 t9 tpl tmi tlp tbk""t4 t5 t6 tmu tdv trp tsq""t1 t2 t3 v0 v1 tfr teq""tco t0 t0.tgo tgo tgo"}.term-pad .pad-key.op{color:var(--accent-strong);font-weight:700}.term-pad .pad-key.var{font-family:Times New Roman,Georgia,serif;font-size:1.9rem;font-style:italic}@media (height>=900px){.pad-key{min-height:66px}}@media (width<=599px) and (height<=899px){.number-pad{gap:6px}.pad-key{min-height:50px;font-size:1.5rem}.player-dock .check-button{min-height:54px}}@media (width>=900px) and (orientation:landscape){.pad-key{min-height:64px}}@media (width>=900px) and (orientation:landscape),(width>=640px) and (height<=620px) and (orientation:landscape){.number-pad.compact{grid-template-columns:repeat(4,1fr);grid-template-areas:"k1 k2 k3 kb""k4 k5 k6 kb""k7 k8 k9 kc""k0 kg kg kg";max-width:480px}.number-pad.compact .pk-comma{display:block}}@media (height<=620px) and (orientation:landscape){.pad-key{min-height:48px;font-size:1.4rem}.player.with-pad .player-dock{width:320px;padding:10px 16px calc(10px + var(--safe-bottom))}}.practice-end{min-height:100dvh;padding:calc(24px + var(--safe-top)) max(20px, var(--safe-right)) calc(24px + var(--safe-bottom)) max(20px, 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14px}.picker-count{margin-right:auto}.picker{flex-direction:column;flex:1;gap:10px;min-height:0;display:flex}.picker-top{flex-wrap:wrap;align-items:center;gap:8px 12px;display:flex}.picker-search{border:2px solid var(--line-strong);background:var(--surface);min-height:48px;color:var(--muted);border-radius:12px;flex:320px;align-items:center;gap:8px;padding:0 6px 0 12px;display:flex}.picker-search:focus-within{outline:3px solid var(--focus);outline-offset:1px}.picker-search input{min-width:0;color:var(--ink);background:0 0;border:none;outline:none;flex:1;min-height:44px;font-size:16px}.icon-button.small{width:36px;height:36px}.picker-filters{flex-wrap:wrap;gap:6px;display:flex}.chip{border:2px solid var(--line-strong);background:var(--surface);min-height:44px;color:var(--ink);border-radius:999px;align-items:center;gap:4px;padding:0 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.check-button{flex:none;order:3;width:auto;min-width:170px;max-width:none;min-height:50px;font-size:1.15rem}.dock-suggest,.player.with-pad .dock-suggest{flex:0 auto;order:2;justify-content:flex-end}.suggest-actions,.player.with-pad .suggest-actions{flex-direction:row;width:auto}.suggest-actions .button,.player.with-pad .suggest-actions .button{width:auto;min-height:48px}.player .player-dock:not(:has(>.number-pad)){justify-content:flex-end}.number-pad:not(.term-pad),.number-pad.compact{flex:auto;order:1;grid-template-areas:none;gap:6px;width:auto;max-width:1060px;display:flex}.number-pad:not(.term-pad) .pad-key{border-bottom-width:3px;border-radius:12px;flex:1 1 0;min-width:40px;max-width:60px;min-height:48px;font-size:1.45rem}.number-pad:not(.term-pad) .pad-spacer{display:none}.number-pad .pk-1{order:1}.number-pad .pk-2{order:2}.number-pad .pk-3{order:3}.number-pad .pk-4{order:4}.number-pad .pk-5{order:5}.number-pad .pk-6{order:6}.number-pad .pk-7{order:7}.number-pad 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0}.pause-delete .link-button{min-height:44px;color:var(--muted);font-weight:500}.started-row{border:1px solid var(--line);background:var(--surface);border-radius:14px;flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:8px 12px;padding:10px 14px;display:flex}.started-row .refresh-text{overflow-wrap:normal;flex:13rem;min-width:0}.pause-locked .round-card-head{font-size:1.25rem}@media (width<=600px){.block-row.kid-row.has-resume{flex-wrap:wrap}.block-row.kid-row.has-resume .block-row-main{flex:100%;min-width:0}.block-row.kid-row.has-resume .resume-button.block-row-go{flex:100%;justify-content:center;margin:0 12px 10px}}.ad-running{background:var(--hint-soft);border:1px solid var(--hint-line);color:var(--ink);border-radius:12px;flex-direction:column;gap:6px;margin:0 0 12px;padding:12px 14px;display:flex}.ad-running p:first-child{color:var(--hint);align-items:center;gap:6px;display:flex}.ad-running 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