:root{--canvas:#f6f5ef;--surface:#fffefb;--ink:#243f35;--body:#40554a;--muted:#65715d;--line:#e1e5da;--teal:#286e5b;--teal-dark:#205644;--teal-soft:#e7eee3;--orange:#bf7042;--orange-soft:#f3e5d5;--cream:#eceee1;--radius:20px;--sidebar:224px;--shadow:0 12px 38px #283f3306;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--body);background:var(--canvas);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;font-size:16px;line-height:1.65}
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.login-layout{min-height:100dvh;display:grid;grid-template-columns:1.08fr 1fr;background:#fdfbf5}.login-story{padding:44px 9%;background:#e9eddf;position:relative;display:flex;flex-direction:column;min-width:0}.login-story .brand{font-size:22px}.login-intro{margin:auto 0;position:relative;padding:65px 0 40px}.login-intro>.eyebrow{font-size:12px;color:#5f6b55;letter-spacing:3px}.login-intro h1{font-size:54px;line-height:1.5;margin:19px 0 23px;color:#345633;letter-spacing:2px}.login-intro h1 span{color:#566d4b}.login-intro>p{font-size:14px;color:#636d57;line-height:1.9;letter-spacing:1px}.login-intro>.hero-art{display:block;width:100%;max-width:420px;margin:13px auto -25px}.login-foot{font-size:10px;letter-spacing:3px;color:#656d58;padding:12px 0}.login-panel{display:flex;align-items:center;justify-content:center;padding:55px 8%}.login-form-wrap{max-width:365px;width:100%}.small-flower{width:44px;height:44px;background:#ede8d9;color:#77674c;border-radius:13px;display:grid;place-items:center;margin-bottom:25px}.login-form-wrap h2{font-size:31px;line-height:1.6;color:#41613b;letter-spacing:.5px}.login-form-wrap>.muted{font-size:12px;color:#616a59;line-height:1.9;margin-top:13px}#login-form{margin-top:32px}#login-form>label{font-size:11px;color:#5f6c50;display:block;margin:18px 0 9px}#login-form input{padding:13px 15px;min-height:52px;border-radius:9px;background:#fffef8}#login-form>.button{margin-top:29px;min-height:51px;font-size:14px}#login-error{font-size:12px;line-height:1.8;color:#8f5a3e;margin:10px 0}.login-note{font-size:10px;text-align:center;color:#676c5c;line-height:2;margin-top:27px}
@media(min-width:1550px){:root{--sidebar:250px}#main{padding:44px 60px}.topbar{padding:0 60px}.hero-copy{padding:42px 0 40px 46px}.hero-copy h2{font-size:46px}.hero-copy p{font-size:15px}.hero-card{min-height:420px}.hero-actions .button{font-size:15px;padding:13px 22px}.hero-note{font-size:12px}.welcome-row h1{font-size:32px}.hero-visual{padding:20px 30px}.sidebar{padding:40px 26px}.sidebar .brand{font-size:23px}.recommended-copy h3{font-size:21px}.recommended-copy p{font-size:14px}.section-heading h2{font-size:21px}.route-preview h3{font-size:15px}.route-preview p{font-size:12px}.route-preview{padding:26px 0}.route-preview>a{padding:0 29px}.gentle-note h3{font-size:20px}}
@media(max-width:1180px){:root{--sidebar:190px}.sidebar{padding:27px 14px 18px}.brand{font-size:18px;gap:8px}.brand>.icon{width:30px;height:30px}.workspace-label{margin-top:36px}.nav-item{font-size:12px;gap:9px;padding:10px 11px}.topbar{padding:0 28px;height:72px}#main{padding:29px 28px}.page-footer{padding:20px 28px 30px}.hero-copy{padding:26px 0 25px 27px}.hero-copy h2{font-size:33px}.hero-copy p{font-size:12px}.hero-actions{gap:8px}.hero-actions .button{font-size:12px;padding:11px 14px}.hero-actions .text-link{font-size:11px}.hero-card{min-height:334px}.hero-visual{padding:0 5px 18px 0}.recommended-lesson{padding:21px 17px;gap:12px}.recommended-lesson .round-icon{width:36px;height:36px}.recommended-copy h3{font-size:17px}.recommended-copy p{font-size:11px}.recommended-lesson .arrow-circle{display:none}.gentle-note{padding:20px}.gentle-note h3{font-size:16px}.route-preview>a{padding:0 16px}.welcome-row h1{font-size:25px}.lesson-layout{grid-template-columns:170px minmax(0,1fr);gap:18px}.lesson-paper,.question-paper{padding:25px}.practice-layout{grid-template-columns:minmax(0,1fr) 205px;gap:18px}.help-card{padding:22px 17px}.question-paper h2{font-size:20px}.chat-open .main-column{padding-right:0}.chat-open .hero-card{grid-template-columns:1fr 1fr}.chat-open .hero-visual{display:flex}.chat-open .today-grid{grid-template-columns:1.55fr 1fr}.chat-open .route-preview{grid-template-columns:repeat(4,minmax(0,1fr))}.chat-open .route-preview>a:nth-child(2){border-right:1px solid var(--line)}.chat-open .route-preview>a:nth-child(n+3){margin-top:0}.chat-open::before{content:"";position:fixed;inset:0;background:#243f351a;z-index:29;pointer-events:none}.chat-panel{width:400px}}
@media(max-width:950px){:root{--sidebar:82px}.sidebar{padding:24px 12px 18px;align-items:center}.sidebar .brand{font-size:0}.sidebar .brand small{display:none}.sidebar .brand>.icon{width:38px;height:38px}.workspace-label{font-size:0;margin:22px 0 5px}.sidebar nav{width:100%}.nav-item{display:flex;flex-direction:column;justify-content:center;padding:10px 2px;gap:6px;font-size:9px;line-height:1.4;min-height:69px;text-align:center}.nav-item .icon{width:21px;height:21px}.sidebar-note{display:none}.sidebar-bottom{margin-top:auto;flex-direction:column;width:100%;gap:7px;padding-top:20px}.sidebar-bottom>div{display:none}.sidebar-bottom .icon-button{margin-left:0}.topbar{height:66px;padding:0 25px}.topbar-location{font-size:11px}.date-tag{font-size:10px}.hero-copy h2{font-size:33px}.hero-actions .text-link{font-size:11px}.hero-copy{padding-left:25px}.hero-card{min-height:330px}.hero-actions{gap:8px}.hero-visual{padding:0 8px 0 0}.art-caption{font-size:9px}.today-grid{gap:16px}.recommended-copy h3{font-size:17px}.recommended-copy p{font-size:11px}.gentle-note{padding:20px}.route-preview>a{padding:0 17px}.route-preview h3{font-size:12px}.route-preview p{font-size:10px}.lesson-layout{grid-template-columns:150px minmax(0,1fr);gap:17px}.step-tab{font-size:11px;padding:9px}.lesson-paper{padding:25px 22px}.practice-layout{grid-template-columns:minmax(0,1fr) 205px;gap:18px}.question-paper{padding:25px 23px}.parent-heading{flex-direction:column;gap:12px}.parent-heading>.button{margin-top:0}.login-story{padding:30px 8%}.login-intro h1{font-size:43px}.login-panel{padding:45px 10%}.login-form-wrap h2{font-size:28px}.login-intro{padding:50px 0}.login-layout{grid-template-columns:1fr 1fr}}
@media(max-width:760px){#main{padding:27px 23px}.topbar{padding:0 23px}.welcome-row{margin-bottom:23px}.welcome-row h1{font-size:22px}.date-tag{display:none}.hero-card{grid-template-columns:1fr;min-height:0}.hero-copy{padding:26px 27px 25px}.hero-copy h2{font-size:37px;line-height:1.45;margin:16px 0 12px}.hero-copy h2 br{display:none}.hero-copy p{font-size:12px}.hero-visual{display:none}.hero-actions{margin-top:23px;gap:18px}.hero-actions .button{font-size:13px}.hero-actions .text-link{font-size:12px}.hero-note{font-size:10px;margin-top:17px}.today-grid{grid-template-columns:1fr}.recommended-lesson{padding:23px 24px}.recommended-lesson .round-icon{width:43px;height:43px}.recommended-copy h3{font-size:19px}.recommended-copy p{font-size:12px}.recommended-lesson .arrow-circle{display:grid}.gentle-note{padding:22px 25px}.gentle-note h3{font-size:17px}.gentle-note h3 br{display:none}.gentle-note p{font-size:12px}.gentle-note>span:last-child{right:25px;bottom:23px}.route-preview{grid-template-columns:1fr 1fr;padding:23px 0}.route-preview>a{padding:0 23px}.route-preview>a:nth-child(2){border:0}.route-preview>a:nth-child(n+3){margin-top:24px}.route-preview h3{font-size:14px}.route-preview p{font-size:11px}.journey-summary>span:last-child{display:none}.page-footer{padding:16px 23px 84px;flex-direction:column;gap:3px;font-size:10px}.page-heading h1{font-size:29px}.page-heading p{font-size:13px}.map-intro{padding:19px;flex-wrap:wrap}.map-intro>span{font-size:12px}.map-lesson{padding:21px 17px;gap:16px}.map-index{width:36px;height:36px;font-size:13px}.map-title{gap:5px}.map-title h2{font-size:16px;width:100%}.map-content p{font-size:12px}.map-arrow{display:none}.lesson-layout{grid-template-columns:1fr;gap:18px}.step-nav{display:flex;overflow-x:auto;gap:5px;padding-bottom:5px}.step-tab{min-width:130px;max-width:165px;font-size:11px;flex-shrink:0;margin:0}.lesson-source{display:none}.lesson-paper{padding:25px}.lesson-paper h2{font-size:23px}.lesson-body{font-size:16px}.fraction-figure{padding:12px 7px 20px}.lesson-bottom{align-items:flex-start;flex-direction:column;gap:6px}.practice-header h1{font-size:23px}.practice-layout{grid-template-columns:1fr}.question-paper{padding:25px}.question-paper h2{font-size:21px}.practice-help{display:block}.help-card{padding:21px 24px}.help-card .round-icon{display:none}.help-card h3{margin-top:0;font-size:18px}.help-card p br{display:none}.help-card>.button{margin-top:15px}.paper-note{padding:17px 22px 0}.question-navigation{margin-top:7px}.chat-panel{inset:10px 10px 10px auto;width:min(420px,calc(100% - 20px));max-height:calc(100dvh - 20px)}.chat-open #main{padding-left:23px;padding-right:23px}.chat-open .hero-card,.chat-open .today-grid{grid-template-columns:1fr}.chat-open .hero-visual{display:none}.chat-open .route-preview{grid-template-columns:1fr 1fr}.chat-open .route-preview>a:nth-child(2){border:0}.chat-open .route-preview>a:nth-child(n+3){margin-top:24px}.chat-compose{max-height:50dvh}.diagnostic-intro,.finish-page{padding:25px 0;margin-top:10px}.diagnostic-intro h1,.finish-page h1{font-size:32px}.diagnostic-intro>p,.finish-page>p{font-size:13px}.diagnostic-intro>p br,.finish-page>p br{display:none}.diagnostic-rules{padding:18px}.diagnostic-rules p{font-size:12px;gap:10px}.paper-panel{padding:23px}.timeline-meta{flex-wrap:wrap;gap:5px}.stats-row>div{padding:0 12px}.stats-row span{font-size:10px}.stats-row strong{font-size:27px}.parent-tabs{gap:5px}.parent-tabs button{font-size:11px;padding:10px 12px}.event-row summary{grid-template-columns:95px 1fr}.event-row summary span{display:none}.review-lessons{grid-template-columns:1fr}.login-layout{min-height:100dvh;grid-template-columns:1fr}.login-story{padding:27px 35px}.login-intro{padding:27px 0 10px}.login-intro h1{font-size:34px;margin:12px 0 10px;line-height:1.5}.login-intro h1 br{display:none}.login-intro>p{font-size:12px}.login-intro>p br{display:none}.login-intro>.hero-art{display:none}.login-foot{display:none}.login-panel{padding:38px 35px 55px;align-items:flex-start}.login-form-wrap{max-width:430px}.login-form-wrap h2{font-size:24px}.login-form-wrap h2 br{display:none}.small-flower{display:none}#login-form{margin-top:23px}.login-note{font-size:10px}.login-story .brand{font-size:18px}.login-intro .eyebrow{font-size:10px}}
@media(max-width:520px){:root{--sidebar:0px}.sidebar{position:relative;width:auto;height:auto;padding:15px 19px;border-right:0;border-bottom:1px solid var(--line);flex-direction:row;flex-wrap:wrap;justify-content:space-between}.site-shell{display:block}.sidebar .brand{font-size:17px}.sidebar .brand small{display:block;font-size:7px;letter-spacing:2px}.sidebar .brand>.icon{width:29px;height:29px}.workspace-label{display:none}.sidebar nav{order:3;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:5px;margin-top:13px}.sidebar nav:has(a:nth-child(5)){grid-template-columns:repeat(5,minmax(0,1fr))}.nav-item{font-size:9px;min-height:58px;gap:4px;border-radius:8px;padding:7px 2px}.nav-item .icon{height:18px;width:18px}.sidebar-bottom{border:0;padding:0;margin:0;flex-direction:row;width:auto;gap:5px}.sidebar-bottom .user-avatar{width:28px;height:28px;font-size:10px}.sidebar-bottom .icon-button{width:44px;height:44px}.main-column{width:100%;margin-left:0}.topbar{height:48px;padding:0 21px;background:#f8f8f1}.topbar-location{font-size:10px;gap:10px}.save-pill{font-size:9px}.topbar-location>strong{max-width:115px;text-overflow:ellipsis;overflow:hidden;white-space:nowrap}#main{padding:24px 21px}.welcome-row h1{font-size:22px}.welcome-row .eyebrow{font-size:10px}.hero-copy{padding:24px}.hero-copy h2{font-size:30px;letter-spacing:0}.hero-copy h2 br{display:block}.hero-copy p{font-size:12px}.hero-actions{gap:10px}.hero-actions .button{font-size:12px}.hero-actions .text-link{font-size:11px}.today-section,.journey-section{margin-top:27px}.section-heading{margin-bottom:14px;gap:8px}.section-heading h2{font-size:17px}.section-heading>span{font-size:9px}.recommended-lesson{padding:20px 18px;gap:13px}.recommended-lesson .round-icon{width:35px;height:35px}.recommended-copy h3{font-size:17px}.recommended-lesson .arrow-circle{display:none}.recommended-copy p{font-size:11px}.route-preview>a{padding:0 19px}.route-preview h3{font-size:12px}.route-preview p{font-size:10px}.page-heading h1{font-size:28px}.page-heading p{font-size:12px}.page-heading .eyebrow{font-size:10px}.map-lesson{padding:18px 15px;gap:12px}.map-content p{font-size:11px}.map-title h2{font-size:16px}.lesson-heading{margin-bottom:19px}.breadcrumb{font-size:11px;margin-bottom:16px;gap:10px}.lesson-paper{padding:22px 19px}.lesson-paper h2{font-size:21px}.lesson-body{font-size:15px;line-height:1.95}.step-actions .button{font-size:12px;padding:10px 14px}.practice-header h1{font-size:21px}.practice-header .eyebrow{font-size:10px}.question-count{font-size:25px}.question-count small{font-size:12px}.question-paper{padding:23px 20px}.question-paper h2{font-size:19px}.choice{font-size:15px;padding:12px 13px;gap:11px;min-height:56px}.choice-letter{padding-right:10px}.answer-actions .button{font-size:12px;padding:11px 16px}.question-navigation .text-button{font-size:11px}.chat-toggle{right:18px;bottom:18px;font-size:12px;min-height:48px;padding:12px 16px}.chat-panel{inset:0;width:100%;height:100dvh;max-height:100dvh;border-radius:0;border:0}.chat-header{padding-top:max(18px,env(safe-area-inset-top))}.chat-messages{min-height:80px}.chat-compose{padding:12px 15px max(15px,env(safe-area-inset-bottom));max-height:56dvh}.chat-compose textarea{min-height:68px}.chat-open .topbar{padding:0 21px}.chat-open #main{padding:24px 21px}.parent-heading>.button{font-size:11px}.stats-row>div{padding:0 9px}.stats-row strong{font-size:25px}.stats-row span{font-size:9px}.parent-tabs{gap:3px}.parent-tabs button{font-size:10px;padding:9px 10px}.paper-panel{padding:20px 17px}.timeline-item>div{margin-left:17px}.timeline-item h3{font-size:13px}.timeline-item p{font-size:12px}.timeline-meta{font-size:9px}.timeline-meta>time{display:block}.parent-message{padding:16px}.parent-message small{margin:0;display:block}.parent-message p{font-size:13px}.conversation-record summary{padding:13px 16px;font-size:13px}.review-note{padding:20px 17px;gap:12px}.review-note .round-icon{width:37px;height:37px}.review-note h3{font-size:15px}.review-note p{font-size:12px}.toast{width:calc(100vw - 35px);font-size:12px}.login-story{padding:23px 27px}.login-panel{padding:31px 27px 43px}.login-intro h1{font-size:32px}.login-intro>.eyebrow{letter-spacing:2px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;scroll-behavior:auto!important;transition:none!important}}
@media(orientation:landscape) and (max-height:620px){.chat-panel{inset:7px 7px 7px auto;max-height:calc(100dvh - 14px)}.chat-header{padding:10px 15px}.chat-context{display:none}.chat-compose{max-height:55dvh;padding:8px 13px}.chat-compose textarea{min-height:52px;height:58px}.chat-messages{min-height:50px;padding:12px 15px}.chat-form-status{margin:3px 0}.chat-send-row{margin-top:4px}.chat-welcome{padding:15px}.chat-welcome>.icon{display:none}}
/* The keyboard-safe height follows the actual visible viewport on iPad Safari. */
.chat-panel{top:calc(var(--visual-top,0px) + 14px);bottom:auto;height:calc(var(--visual-height,100dvh) - 28px);max-height:calc(var(--visual-height,100dvh) - 28px)}
.chat-compose{max-height:calc(var(--visual-height,100dvh) * .55)}
@media(max-width:760px){.chat-panel{top:calc(var(--visual-top,0px) + 10px);height:calc(var(--visual-height,100dvh) - 20px);max-height:calc(var(--visual-height,100dvh) - 20px)}}
@media(max-width:520px){.chat-panel{top:var(--visual-top,0px);height:var(--visual-height,100dvh);max-height:var(--visual-height,100dvh)}}
/* Safe reply typography: only paragraphs, emphasis, and lists are generated. */
.formatted-reply{white-space:normal;font-size:14px;line-height:1.95;overflow-wrap:anywhere}
.formatted-reply p{margin:0 0 12px;white-space:normal}
.formatted-reply p:last-child{margin-bottom:0}
.formatted-reply strong{font-weight:650;color:var(--ink)}
.formatted-reply ul,.formatted-reply ol{margin:9px 0 14px;padding-left:22px}
.formatted-reply li{padding-left:3px;margin:6px 0}
.formatted-reply li::marker{color:var(--teal);font-weight:600}
.parent-message .formatted-reply{margin-top:10px}
/* Experience records are separate; the identity stays visible in both orientations. */
.account-role-badge{display:none;background:var(--orange-soft);border:1px solid #d8b996;color:#79532d;font-size:10px;padding:3px 7px;border-radius:5px;white-space:nowrap}
.experience-notice{display:flex;align-items:center;gap:9px;padding:11px 42px;background:#f3ebda;border-bottom:1px solid #e0d3b8;color:#785f37;font-size:12px;line-height:1.8}
.experience-notice>.icon{width:17px;height:17px}
@media(max-width:1180px){.experience-notice{padding:11px 28px}}
@media(max-width:950px){.account-role-badge{display:inline-flex;font-size:8px;padding:3px 4px}.experience-notice{padding:11px 25px;font-size:11px}}
@media(max-width:520px){.experience-notice{padding:10px 21px}.account-role-badge{font-size:9px;padding:4px 6px}}