@import"https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;600;700;800&display=swap";.student-math[data-v-d3670cd2]{white-space:pre-wrap;overflow-wrap:anywhere;min-width:0}.math-formula[data-v-d3670cd2]{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle;white-space:normal;padding:.12em 0}.math-display[data-v-d3670cd2]{display:block;margin:.45em 0;text-align:center}.math-formula[data-v-d3670cd2] math{font-size:1.08em}.student-page{--student-purple:#7858a5;--student-lavender:#eee6f5;--student-mint:#e5f2ec;--student-ink:#29263a;background:#fffdf9;color:var(--student-ink);border-radius:30px;max-width:940px;margin-top:12px}.student-page .primary{background:var(--student-purple);color:#fff}.student-page .primary:hover{background:#654585}.student-page .card{border:1px solid #eeebf0;box-shadow:0 4px 20px #3e2f5510}.student-solving{max-width:700px;padding:16px 26px 32px}.student-header{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:22px}.student-header h1{font-size:21px;letter-spacing:0;margin:0}.student-header>a,.student-header>button{width:48px;min-height:48px;border-radius:50%;text-align:center;font-size:24px;padding:8px;background:transparent}.student-menu{position:relative;margin:0}.student-menu summary{list-style:none;text-align:center;width:48px;padding:10px}.student-menu[open]{background:#fff;border-radius:16px;box-shadow:0 4px 16px #3332;z-index:2}.student-menu[open] a{display:block;white-space:nowrap;padding:14px}.student-stages{display:grid;grid-template-columns:repeat(4,1fr);padding:0;margin:0 0 22px;list-style:none;gap:6px;text-align:center}.student-stages li{font-size:12px;color:#787482;display:grid;justify-items:center;gap:8px;position:relative;line-height:1.5}.student-stages li>span{background:#f0eef2;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;font-size:18px;font-weight:700}.student-stages .active{color:#654585;font-weight:700}.student-stages .active>span{background:#b99bd8;color:#fff}.student-stages .done>span{background:#d4e6e0;color:#326958}.student-question{margin:0 0 18px;padding:10px 20px!important}.student-question summary{color:#7858a5;text-align:center}.student-edit{margin-top:18px}.student-kicker{font-size:12px;color:#7858a5;margin-bottom:10px}.student-work h2{font-size:24px}.student-prompt{white-space:pre-wrap;margin:20px 0;font-size:18px;color:#29263a}.student-math{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9}.student-math sup{font-size:.72em;line-height:0}.student-math math{margin:0 4px;font-size:1.2em}.student-choices{border:0;padding:0;margin:0 0 18px}.student-choices legend{font-size:14px;margin-bottom:10px;font-weight:600}.student-choices label{display:flex;align-items:center;gap:12px;min-height:56px;padding:12px;border:1px solid #ddd4e7;border-radius:14px;margin-bottom:10px;cursor:pointer}.student-choices label.selected{background:#eee6f5;border-color:#7858a5}.student-choices input{width:20px;min-height:20px;height:20px;accent-color:#7858a5;flex-shrink:0}.student-feedback{border-radius:16px;background:#fff0e4;padding:16px;margin:16px 0;font-size:15px}.student-feedback.success{background:#e5f2ec}.student-hint{display:flex;align-items:flex-start;gap:12px;background:#fff6dc;border-radius:18px;padding:14px;margin:18px 0}.student-companion{width:46px;height:46px;flex-shrink:0}.student-hint>div{flex:1;min-width:0}.student-hint p{font-size:14px;margin:4px 0 0}.student-hint>button{padding:0;min-width:36px;background:transparent;min-height:36px}.student-step-actions{display:flex;gap:10px;margin-top:12px}.student-step-actions button{flex:1;border:1px solid #ddd4e7;background:#fff;font-size:14px;padding:10px}.student-history{border-radius:16px;background:#f9f6fb;padding:16px;margin-bottom:12px}.student-history h3{font-size:16px;margin:4px 0}.student-history p{margin:8px 0 0;font-size:14px}.student-complete{text-align:center;padding:16px 0}.student-complete .student-companion{margin:0 4px 16px}.student-teacher{background:#f7f3fa!important}.student-teacher h2{font-size:18px}.student-context{background:#f0e9f7;border-radius:20px;padding:18px;margin-bottom:20px}.student-context h2{font-size:19px;margin:6px 0}.student-context small{color:#654585}.student-context .note{margin-top:8px}.student-conversation{padding-bottom:12px}.student-bubble{border-radius:22px;padding:18px;margin:0 24px 16px 0;background:#e5f2ec}.student-bubble.own{background:#eee6f5;margin:0 0 16px 24px}.student-bubble p{font-size:15px;margin:12px 0;color:#29263a}.student-bubble-heading{display:flex;align-items:center;gap:8px}.student-bubble-heading .student-companion{width:32px;height:32px}.student-user-avatar{background:#fff8;width:32px;height:32px;display:grid;place-items:center;border-radius:50%;font-size:12px}.student-bubble button{font-size:12px;padding:8px 14px;background:#fffa;min-height:44px}.student-bubble audio,.student-compose audio{width:100%;margin:12px 0}.student-compose{margin-top:8px}.student-voice{padding-bottom:16px;margin-bottom:18px;border-bottom:1px solid #e8e1ec}.student-voice h2{font-size:19px}.student-empty{padding:30px 16px;text-align:center;font-size:14px}.student-home-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0}.student-home-heading h1{font-size:clamp(26px,3vw,34px);margin-bottom:6px}.student-home-heading p{font-size:14px;margin:0}.student-duo{display:flex;gap:8px}.student-upload{padding:26px;border-radius:24px;background:#eee6f5;margin:16px 0 28px}.student-upload h2{font-size:26px}.student-upload>p{font-size:15px}.student-upload .subject-select{max-width:none}.student-upload .actions>*{flex:1}.student-entry{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px;border:1px solid #e8e1ed;border-radius:18px;background:#fff;color:#29263a;margin-bottom:12px}.student-entry>div{min-width:0}.student-entry h3{font-size:16px;margin:6px 0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.student-entry .pill{white-space:nowrap}.student-lessons{margin-top:24px}.student-record-intro{padding:20px;background:#eee6f5;border-radius:20px}.student-record-intro h1{font-size:26px;margin:0}.student-page .section-title h2{font-size:20px}.student-page .note button{font-size:12px;padding:6px 10px}.student-record-empty{display:flex;gap:12px;align-items:center;padding:24px}.student-record-empty p,.student-page label.upload-button{margin:0}.student-page .upload-button:focus-within{outline:3px solid #654585;outline-offset:3px}@media(max-width:600px){.student-page{border-radius:24px;padding:16px;margin:6px 8px 0}.student-solving{padding:12px 16px 24px}.student-stages{gap:3px}.student-stages li{font-size:10px}.student-stages li>span{width:36px;height:36px}.student-work{padding:20px!important}.student-work h2{font-size:22px}.student-prompt{font-size:17px}.student-header{margin-bottom:18px}.student-home-heading h1{font-size:25px}.student-duo{gap:4px}.student-duo .student-companion{width:36px;height:36px}.student-upload{padding:20px}.student-upload .actions{flex-direction:column}.student-upload .actions>*{width:100%}.student-entry{padding:16px;gap:10px;align-items:flex-start}.student-entry .pill{font-size:10px;padding:6px 10px}.student-bubble{margin-right:12px}.student-bubble.own{margin-left:12px}}.student-reasoning-diagram{padding:12px 0}.student-reasoning-diagram article{background:#e5f2ec;border:1px solid #d4e6e0;border-radius:18px;padding:18px;text-align:center}.student-reasoning-diagram h3{font-size:16px;margin:8px 0}.student-reasoning-diagram p{font-size:14px;margin:8px 0 0}.student-reasoning-arrow{text-align:center;font-size:24px;color:#7858a5;padding:6px}audio[data-v-502ec214]{display:block;width:300px;max-width:100%;margin-top:8px}.board-v2[data-v-ea420c74]{display:flex;flex-direction:column;min-width:0;background:#f5f2fb;border-radius:16px;padding:10px;min-height:65vh}.tools[data-v-ea420c74],.pages[data-v-ea420c74],.sync[data-v-ea420c74]{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.tools button[data-v-ea420c74],.pages button[data-v-ea420c74]{padding:7px 10px;font-size:13px}.selected[data-v-ea420c74]{background:#dcd2fa}.tools label[data-v-ea420c74]{display:flex;align-items:center;font-size:12px}.tools input[type=range][data-v-ea420c74]{width:60px}.tools input[type=color][data-v-ea420c74]{width:30px;height:28px;padding:0;border:0}.sync[data-v-ea420c74]{font-size:12px;padding:7px;color:#525763;justify-content:space-between}.viewport[data-v-ea420c74]{flex:1;min-height:52vh;overflow:hidden;border-radius:10px;background:#dedde5}.viewport canvas[data-v-ea420c74]{display:block;width:100%;height:100%;min-height:52vh;touch-action:none}.conflicts[data-v-ea420c74]{background:#fff1d5;padding:10px;font-size:13px}.note[data-v-ea420c74]{font-size:12px;margin:6px}.error[data-v-ea420c74]{font-size:13px}@media(max-width:650px){.tools[data-v-ea420c74]{max-height:92px;overflow:auto}.pages[data-v-ea420c74]{max-height:75px;overflow:auto}.board-v2[data-v-ea420c74]{padding:5px;border-radius:8px}.viewport[data-v-ea420c74],.viewport canvas[data-v-ea420c74]{min-height:60vh}}.voice-panel[data-v-2b8adaad]{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:12px 16px;border-radius:16px}.voice-panel .section-title[data-v-2b8adaad]{margin:0;gap:12px}.voice-panel .actions[data-v-2b8adaad]{margin:0 0 0 auto;gap:8px}.voice-panel .actions button[data-v-2b8adaad]{padding:10px 14px}.voice-panel .error[data-v-2b8adaad],.voice-panel .note[data-v-2b8adaad]{flex-basis:100%;margin:0;font-size:12px}@media(max-width:650px){.voice-panel[data-v-2b8adaad]{gap:8px;padding:10px 12px}.voice-panel .actions[data-v-2b8adaad]{margin:0}.voice-panel .section-title[data-v-2b8adaad]{flex:1}}.teacher-tools[data-v-57a5b3a6]{position:relative}.buttons[data-v-57a5b3a6]{display:flex;gap:8px}.panel[data-v-57a5b3a6]{position:absolute;right:0;top:45px;z-index:20;width:min(30vw,400px);max-height:75vh;overflow:auto;padding:16px;border:1px solid #ded5f4;border-radius:16px;background:#fffcf8;box-shadow:0 10px 35px #29213925}.panel label[data-v-57a5b3a6]{display:block;margin:8px 0;font-size:13px}.panel textarea[data-v-57a5b3a6],.panel select[data-v-57a5b3a6]{width:100%}.panel button[data-v-57a5b3a6]{padding:8px;margin:4px}.panel pre[data-v-57a5b3a6]{white-space:pre-wrap;font-size:12px}.close[data-v-57a5b3a6]{float:right}.panel h3[data-v-57a5b3a6]{font-size:17px}@media(max-width:800px){.panel[data-v-57a5b3a6]{position:fixed;top:70px;right:10px;width:min(90vw,400px);max-height:80vh}}.practice[data-v-3856b85b]{background:#edf8f3;border-radius:12px;padding:12px;margin:10px 0}.practice textarea[data-v-3856b85b]{width:100%}.practice h3[data-v-3856b85b]{font-size:16px}.practice h4[data-v-3856b85b]{font-size:14px}.practice article[data-v-3856b85b]{border-top:1px solid #d1e4db;padding:8px 0}.practice small[data-v-3856b85b]{color:#626b67}.classroom-grid.teaching[data-v-7a7b92d3]{display:block}.teaching .question-context[data-v-7a7b92d3]{display:block;width:100%;margin-bottom:8px;padding:8px 12px}.teaching .question-context .drawer-toggle[data-v-7a7b92d3]{display:block}.teaching .question-context .context-body[data-v-7a7b92d3]{display:none}.teaching .question-context.open .context-body[data-v-7a7b92d3]{display:block;max-height:40vh;overflow:auto}.classroom-work[data-v-7a7b92d3]{position:relative}.classroom-page .page-heading[data-v-7a7b92d3]{display:none}.classroom-page[data-v-7a7b92d3]{padding-top:8px}.classroom-work>.card.yellow[data-v-7a7b92d3]{margin-top:10px}.question-context img[data-v-7a7b92d3]{max-height:200px;object-fit:contain}:root{font-family:Noto Sans TC,-apple-system,BlinkMacSystemFont,PingFang TC,sans-serif;color:#20252b;background:#f5f5f8;font-synthesis:none;--purple:#D9CCE8;--mint:#D4E6E0;--yellow:#FFE8A3;--blue:#D2DCF0;--dark:#20252B;--link:#654585}*{box-sizing:border-box}body{margin:0}a{color:var(--link);text-decoration:none}button,input,textarea,select{font:inherit}button,.primary,.secondary{min-height:48px;padding:12px 20px;border:0;border-radius:16px;cursor:pointer;background:#fff;color:var(--dark);display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:15px;line-height:1.5}button:hover,.secondary:hover{box-shadow:inset 0 0 0 2px #b99bd8}.primary{background:var(--dark);color:#fff}.primary:hover{background:#3f3450}.secondary{background:#fff;color:var(--dark)}button:disabled{opacity:.55;cursor:not-allowed}button.ghost{padding:8px 12px;background:transparent;font-weight:400}button.selected{background:var(--link);color:#fff}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--link);outline-offset:4px}h1,h2,h3,h4,p{margin-top:0}h1{font-size:clamp(28px,3.3vw,44px);line-height:1.4;letter-spacing:-.04em;margin-bottom:16px;font-weight:800}h2{font-size:23px;line-height:1.5;letter-spacing:-.025em;margin-bottom:14px}h3{font-size:18px;line-height:1.6;margin-bottom:10px}p{font-size:16px;line-height:1.85;color:#505963;margin-bottom:18px;overflow-wrap:anywhere}small{font-size:13px;color:#505963}.app-shell{max-width:1400px;margin:auto;padding-bottom:100px}.topbar{padding:24px 40px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-size:24px;font-weight:800;color:var(--dark);white-space:nowrap}.brand small{font-weight:400;padding-left:12px}.account{display:flex;align-items:center;gap:12px;font-size:14px}.page{max-width:1100px;padding:20px 32px 32px;margin:auto}.page.narrow{max-width:800px}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:16px 0 24px}.eyebrow{font-size:11px;font-weight:700;letter-spacing:.15em;color:#505963;display:block;margin-bottom:16px}.circle-icon{display:flex;align-items:center;justify-content:center;width:76px;height:76px;flex-shrink:0;background:#fff;border-radius:50%;font-size:36px}.card{background:#fff;border-radius:24px;padding:24px;margin-bottom:20px}.lavender{background:var(--purple)}.mint{background:var(--mint)}.yellow{background:var(--yellow)}.blue{background:var(--blue)}.pill{display:inline-flex;align-items:center;justify-content:center;border-radius:100px;padding:7px 14px;font-size:12px;font-weight:500;line-height:1.5;background:#f5f5f8;color:var(--dark);max-width:100%}.pill.lavender{background:var(--purple)}.pill.mint{background:var(--mint)}.pill.yellow{background:var(--yellow)}.pill.blue{background:var(--blue)}.hero{border-radius:32px;padding:36px;display:grid;grid-template-columns:1.5fr 1fr;align-items:center;gap:24px;margin-bottom:30px;overflow:hidden}.hero h2{font-size:34px;line-height:1.5;margin-top:22px}.hero img{max-width:100%;border-radius:28px}.actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:16px 0}.upload-button{position:relative;overflow:hidden}.upload-button input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;padding:0}.grid{display:grid;gap:20px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid .card{margin-bottom:0}.stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-bottom:24px}.stat{border-radius:28px;padding:24px;display:grid;gap:10px}.stat strong{font-size:44px;line-height:1.2}.stat span{font-weight:600}.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:28px 0 16px}.section-title h2{margin:0}.card .section-title{margin-top:0}.list-item{display:flex;gap:16px;justify-content:space-between;align-items:center;color:var(--dark);min-height:60px;line-height:1.8}.navigation{position:fixed;z-index:10;bottom:18px;left:50%;transform:translate(-50%);background:#fff;box-shadow:0 8px 30px #20252b15;border:1px solid #eee;border-radius:24px;padding:8px 14px;display:flex;justify-content:center;gap:12px;max-width:calc(100% - 32px)}.navigation a{min-width:90px;min-height:58px;display:flex;align-items:center;justify-content:center;gap:6px;border-radius:16px;font-size:18px;color:#505963;flex-direction:column}.navigation a span{font-size:12px}.navigation a.router-link-exact-active{background:var(--purple);color:#20252b}.auth-layout{max-width:1100px;margin:20px auto;display:grid;grid-template-columns:1.05fr 1fr;gap:28px;padding:0 32px}.welcome{border-radius:32px;padding:40px;display:flex;flex-direction:column;justify-content:center}.welcome img{width:100%;max-width:380px;border-radius:28px;align-self:center;margin-top:16px}.welcome h1{font-size:38px}.auth-form{padding:36px;margin:0}.auth-form h2{font-size:30px}.full{width:100%}.center{text-align:center;margin-top:24px}.note{font-size:13px;line-height:1.75;margin:16px 0 0}.empty{padding:24px;text-align:center;color:#505963;line-height:1.9}.empty-companions{max-width:240px;width:100%;border-radius:24px;margin-bottom:16px}.error{background:#fff0ed;color:#8c3027;border:1px solid #edc6bf;border-radius:16px;padding:14px 16px;font-size:14px;line-height:1.8;margin:12px 0}.error button{padding:6px 12px;margin-left:8px;background:#fff;min-height:44px}.state{padding:20px;border-radius:16px;background:#f5f5f8;margin:16px 0;line-height:1.8}.back{display:inline-flex;align-items:center;min-height:48px;font-size:14px}label{display:grid;gap:8px;font-size:14px;font-weight:600;margin-bottom:18px;color:#20252b}input,textarea,select{width:100%;min-height:48px;border:1px solid #ccd0d6;background:#fff;border-radius:14px;padding:12px 14px;color:#20252b;font-size:16px}textarea{resize:vertical;line-height:1.75}label.check{display:flex;align-items:center;gap:12px;min-height:48px}.check input{width:22px;height:22px;min-height:22px}.question-image{display:block;max-width:100%;max-height:360px;border-radius:16px;object-fit:contain;margin:16px auto}.step-card{display:flex;gap:16px;padding:20px;background:#fff;border-radius:18px;margin-bottom:14px}.step-card h3{margin-top:4px}.step-number{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--purple);border-radius:50%;flex-shrink:0;font-size:14px;font-weight:700}.formula{font-size:20px;font-family:ui-monospace,monospace;color:var(--dark);overflow-wrap:anywhere;white-space:pre-wrap}.messages{max-height:440px;overflow:auto;padding:8px 0}.message{background:#f5f5f8;border-radius:18px;padding:16px;margin-bottom:12px}.message.student{background:var(--purple);margin-left:36px}.message.assistant{background:var(--mint);margin-right:24px}.message p{white-space:pre-wrap;margin-bottom:0}.message small{display:block;margin-bottom:6px}.teacher-grid{grid-template-columns:repeat(3,minmax(0,1fr));margin-top:24px}.teacher-card{display:flex;flex-direction:column}.teacher-card p{flex-grow:1}.avatar{width:60px;height:60px;border-radius:50%;background:var(--purple);display:flex;align-items:center;justify-content:center;font-size:24px}.record-card{display:flex;flex-direction:column;gap:10px;color:var(--dark)}.record-card h3{margin-bottom:0}.record-card span:last-child{align-self:flex-end;font-size:14px}.lesson-row{display:flex;align-items:center;gap:20px;color:var(--dark)}.lesson-row>div{flex:1}.lesson-row h3{margin:8px 0 0}.admin-stats{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}.admin-stats .card{display:grid;gap:12px}.admin-stats strong{font-size:32px}.tabs{display:flex;gap:12px;margin:16px 0 28px;flex-wrap:wrap}.review-card{display:flex;gap:28px;justify-content:space-between;align-items:center}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:14px;text-align:left}th,td{padding:16px;border-bottom:1px solid #eee;line-height:1.8}th{white-space:nowrap}code{font-size:15px;color:var(--link)}.app-shell.classroom{padding-bottom:0}.classroom-page{max-width:1300px}.classroom-grid.teaching{display:grid;grid-template-columns:minmax(230px,.65fr) minmax(0,1.8fr);gap:20px;align-items:start}.question-context{margin-bottom:20px}.drawer-toggle{display:none}.preserve{white-space:pre-wrap}.voice-panel{padding:20px;background:var(--purple);border-radius:24px;margin-bottom:16px}.voice-panel .section-title{margin:0}.voice-panel .actions{margin-bottom:0}.board-panel{background:#fff;border-radius:24px;padding:16px;margin-bottom:20px}.board-toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.board-toolbar button{background:#f5f5f8;font-size:13px;padding:10px 14px}.board-toolbar button.selected{background:var(--link);color:#fff}.color-label{display:flex;align-items:center;margin:0;font-size:12px;gap:6px}.color-label input{width:48px;padding:5px}.board-status{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:#505963;margin:14px 0}.whiteboard{width:100%;height:430px;display:block;touch-action:none;background:#fff;border:1px solid #e2d9eb;border-radius:12px;cursor:crosshair}.waiting{position:relative;padding-right:260px;min-height:250px}.waiting img{position:absolute;right:20px;top:26px;max-width:210px;border-radius:20px}.practice-feedback{background:#fff;border-radius:16px;padding:20px;margin-top:16px}details{margin:20px 0}summary{cursor:pointer;min-height:48px;display:list-item;line-height:1.8;font-size:14px;padding:12px 4px;font-weight:600}.context-body details article{padding:12px;background:#f5f5f8;border-radius:14px;margin-bottom:10px}.context-body p{font-size:14px}.context-body h2{font-size:20px}@media(max-width:900px){.topbar{padding:20px 24px}.teacher-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.admin-stats{grid-template-columns:repeat(3,1fr)}.auth-layout{gap:20px;padding:0 24px}.welcome{padding:28px}.welcome h1{font-size:30px}.classroom-grid.teaching{grid-template-columns:1fr}.classroom-grid.teaching .drawer-toggle{display:flex;width:100%;justify-content:space-between}.classroom-grid.teaching .context-body{display:none}.classroom-grid.teaching .open .context-body{display:block;margin-top:18px}.whiteboard{height:480px}}@media(max-width:600px){.topbar{padding:18px 20px}.brand{font-size:20px}.brand small{display:none}.topbar>.pill{font-size:10px;padding:6px 10px}.account{gap:4px;font-size:12px}.page{padding:8px 20px 24px}.page-heading{margin-top:12px}.page-heading .circle-icon{width:58px;height:58px;font-size:28px}.hero{grid-template-columns:1fr;gap:16px;padding:24px}.hero h2{font-size:30px}.hero img{width:180px;justify-self:end;margin-top:-24px}.hero .actions{position:relative;z-index:1}.actions{gap:8px}.hero .actions .primary,.hero .actions .secondary{width:100%}.grid.two{grid-template-columns:1fr}.stat-grid{gap:12px}.stat{padding:20px}.stat strong{font-size:38px}.stat small{font-size:11px}.card{padding:20px}.navigation{bottom:12px;padding:6px;width:calc(100% - 32px);gap:4px}.navigation a{min-width:0;flex:1;font-size:20px;min-height:56px}.auth-layout{grid-template-columns:1fr;padding:0 20px;gap:20px}.welcome{padding:24px}.welcome img{max-width:220px;margin-top:0}.welcome h1{font-size:30px}.welcome p{font-size:14px}.auth-form{padding:24px}.teacher-grid{grid-template-columns:1fr}.section-title{align-items:flex-start}.section-title h2{font-size:21px}.section-title>span,.section-title>a{font-size:12px;line-height:1.8}.lesson-row{flex-wrap:wrap;gap:12px}.lesson-row>div{flex-basis:100%}.admin-stats{grid-template-columns:repeat(2,1fr);gap:12px}.admin-stats .card{padding:16px}.review-card{display:block}.whiteboard{height:380px}.board-panel{padding:12px}.board-toolbar{gap:6px}.board-toolbar button{font-size:12px;padding:8px 10px}.waiting{padding:24px;min-height:0}.waiting img{position:static;display:block;max-width:160px;margin:16px auto}.step-card{padding:16px;gap:10px}.message.student{margin-left:20px}.message.assistant{margin-right:16px}.classroom-page .page-heading h1{font-size:28px}.voice-panel{padding:16px}.voice-panel .section-title{flex-wrap:wrap}.voice-panel .primary{width:100%;font-size:14px}.question-context{padding:16px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}.version-label{text-align:center;font-size:10px;color:#505963;letter-spacing:.04em;padding:24px 10px 0}.subject-select{max-width:220px;margin-top:20px}.subject-select select{background:#ffffffd9}select[multiple]{min-height:120px}:root{--surface:#fff;--background:#f5f5f8;--muted:#505963;--radius-card:24px;--space:8px}body{background:var(--background)}.topbar{height:56px;padding:0 24px;border-bottom:1px solid #e8e5ec;background:#f5f5f8f2;position:relative;z-index:20}.header-start{display:flex;align-items:center;gap:8px;min-width:0}.header-title{font-size:16px;font-weight:700}.topbar .brand{font-size:24px;min-width:40px}.icon-button{width:48px;padding:8px;background:transparent}.account-menu{position:relative;margin:0}.account-menu>summary{list-style:none;width:48px;height:48px;text-align:center;padding:6px;font-size:25px}.account-menu>summary::-webkit-details-marker{display:none}.account-popover{position:absolute;right:0;top:48px;width:220px;border:1px solid #ece6f2;background:#fff;border-radius:18px;padding:16px;box-shadow:0 12px 32px #20252b18}.account-popover a,.account-popover button{display:flex;align-items:center;min-height:48px}.account-popover p{font-size:13px;margin:0}.skip-link{position:fixed;top:-100px;left:16px;z-index:100;background:#fff;padding:12px}.skip-link:focus{top:8px}.workspace-page{max-width:1120px;padding-top:24px}.workspace-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}.workspace-heading h1{font-size:clamp(24px,3vw,32px);margin:0;line-height:1.45}.workspace-heading .eyebrow{margin-bottom:8px;letter-spacing:0}.workspace-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0 28px}.workspace-tabs button{background:#fff;gap:8px}.workspace-tabs .selected{background:var(--link)}.workspace-tabs button span{font-size:12px}.request-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}.request-meta h3{margin:0}.request-card h3{margin-top:16px;min-height:58px}.request-card p{min-height:48px;font-size:14px}.line-clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.compact-lesson{display:flex;justify-content:space-between;align-items:center;gap:16px;color:var(--dark)}.compact-lesson>div{min-width:0;flex:1}.compact-lesson h3{margin:8px 0}.notice-bell{position:relative;width:56px;height:56px;border-radius:50%;font-size:24px;flex-shrink:0}.notice-count{position:absolute;right:-2px;top:-2px;min-width:22px;height:22px;padding:2px 5px;border-radius:100px;background:var(--link);color:#fff;font-size:11px}.notice-row{width:100%;justify-content:flex-start;text-align:left;gap:16px;font-weight:400;position:relative;border:1px solid transparent}.notice-row>div{flex:1;min-width:0}.notice-row>span:last-child{white-space:nowrap;font-size:13px}.notice-row.unread{border-color:#b99bd8;background:#f3edf8}.notice-row p{font-size:14px;margin:8px 0}.unread-dot{width:8px;height:8px;background:var(--link);border-radius:50%;flex-shrink:0}.approval-note h2{margin-top:16px}.profile-form{max-width:720px}.subject-checks{display:flex;flex-wrap:wrap;gap:16px}.subject-checks label{margin:0}fieldset{border:0;margin:0 0 16px;padding:0}legend{font-size:14px;font-weight:600;padding:0;margin-bottom:8px}.feedback-success{background:var(--mint);padding:12px 16px;border-radius:16px;font-size:14px}.ops-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.ops-summary .card{display:grid;gap:16px}.ops-summary strong{font-size:32px}.inline-label{display:flex;align-items:center;gap:8px;margin:0;font-size:12px}.inline-label select{width:auto;max-width:160px}.modal-backdrop{position:fixed;z-index:60;inset:0;background:#20252b70;display:flex;align-items:center;justify-content:center;padding:20px;backdrop-filter:blur(3px)}.modal-card{background:var(--surface);border-radius:28px;padding:24px;width:min(640px,100%);max-height:calc(100dvh - 40px);overflow:auto;box-shadow:0 20px 80px #20252b30}.modal-card .section-title{margin:0 0 16px}.modal-card .section-title>button{width:48px;padding:8px;flex-shrink:0}.modal-card h3{margin-top:16px}.modal-card .question-image{max-height:300px}.modal-card .card{padding:16px}.teacher-detail .avatar{margin-bottom:16px}.teacher-detail .actions{gap:8px}.app-shell.classroom .classroom-grid.teaching{display:block}.app-shell.classroom .classroom-page{padding-top:8px}.app-shell.classroom .page-heading{margin:8px 0}.app-shell.classroom .page-heading h1{font-size:20px}.app-shell.classroom .eyebrow{display:none}.app-shell.classroom .drawer-toggle{display:flex;width:100%;justify-content:space-between}.app-shell.classroom .question-context .context-body{display:none}.app-shell.classroom .question-context.open .context-body{display:block}.app-shell.classroom .question-context{padding:8px 16px;margin-bottom:8px}.app-shell.classroom .back{display:none}.app-shell.solving{padding-bottom:24px}@media(max-width:600px){.topbar{padding:0 12px}.header-title{font-size:15px}.workspace-page{padding-top:20px}.workspace-tabs{gap:6px;margin:16px 0 24px}.workspace-tabs button{padding:10px 12px;font-size:13px}.workspace-heading h1{font-size:24px}.workspace-heading>button{padding:10px 12px;font-size:13px}.ops-summary{gap:8px}.ops-summary .card{padding:14px 12px}.ops-summary strong{font-size:26px}.ops-summary small{font-size:11px}.modal-backdrop{padding:12px;align-items:flex-end}.modal-card{padding:20px;border-radius:24px;max-height:calc(100dvh - 24px)}.review-card .primary{width:100%}.notice-row{padding:16px}.notice-row>span:last-child{font-size:12px}.inline-label{gap:4px}.inline-label select{max-width:130px}.compact-lesson{padding:20px}}