:root{--ink:#102d3a;--muted:#586774;--teal:#236c62;--deep:#173f40;--cream:#fcfaf5;--line:#e7e6df;--serif:Georgia,'Times New Roman',serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--cream);font:15px/1.45 system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}button,input,textarea,select{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible,textarea:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #db8c30;outline-offset:4px}button{color:inherit}a{color:var(--teal)}[hidden]{display:none!important}.sidebar{width:218px;position:fixed;inset:0 auto 0 0;background:linear-gradient(125deg,#1b4545,#153b3d);color:#fff;padding:24px 12px;display:flex;flex-direction:column;z-index:10}.brand{padding:0 17px 26px;font: bold 30px/1.08 var(--serif)}.brand svg{width:82px;display:block;margin:0 auto 12px 26px}.brand small{display:block;font-size:25px}.nav{border:0;background:transparent;color:#fff;display:flex;align-items:center;gap:17px;width:100%;padding:15px 18px;text-align:left;border-radius:12px;margin:5px 0;font-size:15px}.nav span{font-size:25px;width:24px}.nav:hover,.nav.active{background:#32615d}.privacy{margin:auto 3px 16px;border:1px solid #547976;border-radius:12px;padding:16px 13px;display:flex;gap:12px;font-size:12px}.privacy>span{font-size:22px}.privacy p{margin:5px 0 0;line-height:1.5;color:#e1ece8}main{margin-left:218px;padding:20px 23px 12px;max-width:1900px}header{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:0 8px 16px}h1{font:bold clamp(28px,3.1vw,48px)/1.1 var(--serif);letter-spacing:-1.2px;margin:0 0 6px}.sprout{color:#6e9767;font-size:42px;margin-left:7px}header p{margin:0;color:var(--muted);font-size:17px}.dot{padding:0 8px}.settings{border:0;background:transparent;display:flex;align-items:center;gap:12px;font-size:13px}.avatar{background:#dbe8da;border:4px solid #fff;border-radius:50%;width:43px;height:43px;display:grid;place-items:center;font:22px var(--serif);color:var(--teal)}.demo-banner{background:#f1eadc;border:1px solid #e5dbc6;border-radius:9px;padding:9px 14px;font-size:12px;margin-bottom:13px;color:#655339}.demo-banner strong{font-size:10px;letter-spacing:1px;margin-right:10px}.workspace-grid{display:grid;grid-template-columns:minmax(0,1.62fr) minmax(320px,1fr);gap:12px}.panel{background:rgba(255,255,255,.85);border:1px solid var(--line);border-radius:15px;padding:20px}h2{font:bold 23px/1.2 var(--serif);margin:0}.spark{color:#ff9076;padding-right:10px}.subjects{display:flex;gap:8px;flex-wrap:wrap;margin:15px 0 22px}.chip{border:1px solid transparent;border-radius:30px;padding:9px 15px;font-size:13px;background:#f5ede5}.chip:nth-child(1){background:#fff0ec;color:#913f35}.chip:nth-child(2){background:#f1edfc;color:#645087}.chip:nth-child(3){background:#e1eee3;color:#235642}.chip:nth-child(4){background:#e4f2f6;color:#275565}.chip[aria-pressed=true]{border-color:currentColor;box-shadow:0 0 0 2px #fff inset}.message{white-space:pre-wrap;padding:14px 16px;border-radius:14px;font-size:14px}.message.user{background:#e7f1e9;margin-left:auto;max-width:76%;margin-bottom:14px}.attachment{display:flex;gap:10px;padding:10px 12px;background:#fffaf8;border-radius:9px;margin-top:10px;font-size:12px}.attachment small{display:block;color:var(--muted)}.assistant-line{display:flex;align-items:flex-start;gap:11px;margin:15px 0}.assistant-avatar{border-radius:50%;background:#e5f0e6;width:42px;height:42px;display:grid;place-items:center;color:var(--teal);font-size:26px;flex-shrink:0}.assistant-line p{margin:0;background:#f5f5f3;border-radius:9px;padding:12px 15px;font-size:14px}.activities{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.activity{background:#fcf9f2;border:1px solid #eeebe4;border-radius:12px;padding:13px 12px;font-size:12px}.activity header{margin:0 0 13px;gap:9px;align-items:flex-start}.activity h3{font:bold 17px/1.1 var(--serif);margin:0 0 3px}.number{background:#ff947b;color:white;border-radius:50%;width:25px;height:25px;display:grid;place-items:center;flex-shrink:0;font-weight:bold}.activity:nth-child(2) .number{background:#7b9d71}.activity p{line-height:1.42}.activity ul{list-style:none;padding:0;margin:12px 0 0}.activity li{margin-top:10px}.activity .detail{margin-top:12px;width:100%;font-size:12px}.activity-art{height:119px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:#fce8df;overflow:hidden}.activity:nth-child(2) .activity-art{background:#edf1df}.activity:nth-child(3) .activity-art{background:#ffedc8}.tenframe{display:grid;grid-template-columns:repeat(5,1fr);gap:3px;width:155px;background:#fff9ed;padding:5px;border:1px solid #e3d6c8;box-shadow:0 2px 4px #14332c12}.tenframe i{display:block;aspect-ratio:1;border:1px solid #dc4948;background:linear-gradient(145deg,#ff7b72,#f45350);border-radius:50%}.tenframe .yellow{background:linear-gradient(145deg,#ffdc6a,#ffbb35);border-color:#efa822}.tenframe .empty{background:#f5f1e9;border-color:#ded9cf;border-radius:0}.bonds{position:relative;width:130px;height:106px;display:grid;grid-template-columns:1fr 1fr;gap:8px 26px;align-items:center;justify-items:center}.bonds:before,.bonds:after{content:'';position:absolute;top:48px;height:40px;width:1px;background:#426b56;transform:rotate(35deg);left:42px}.bonds:after{left:88px;transform:rotate(-35deg)}.bonds b{border:1px solid #386445;background:#fff;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;font-size:23px;z-index:1}.bonds b:first-child{grid-column:1/3}.problem{background:#fff;padding:12px;transform:rotate(-5deg);font-size:11px;width:88%;border:1px solid #e5d7b9;box-shadow:0 2px 5px #825b1e12}.problem b{font-size:20px;display:block;margin-top:7px}.review-note{font-size:11px;color:var(--muted);margin:14px 0 19px}.composer{border:1px solid #dfdfda;border-radius:13px;padding:12px 14px;background:#fff}.composer textarea{width:100%;resize:vertical;border:0;color:var(--ink);min-height:50px;background:transparent}.composer-actions{display:flex;justify-content:space-between;align-items:center;gap:8px}.text-button{border:0;background:none;color:#215f58;padding:5px 0;font-size:13px}.composer .text-button{margin-right:12px;font-size:12px}.send{background:var(--teal);color:#fff;border:0;width:43px;height:43px;border-radius:50%;font-size:21px;flex-shrink:0}#selected-file{margin-top:10px;padding:10px;background:#f0f5ee;border-radius:8px;word-break:break-word;font-size:12px}#selected-file button{margin-left:9px}.right-column{display:flex;flex-direction:column;gap:12px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:19px}.cover{background:#fff6e9;border:1px solid #eee8de;border-radius:10px;padding:25px 20px 18px;position:relative;overflow:hidden;isolation:isolate}.cover:before{content:'';position:absolute;width:190px;height:130px;background:#ffc6b3;top:-75px;left:-65px;transform:rotate(-45deg);border-radius:45%;z-index:-1}.cover:after{content:'';position:absolute;width:450px;height:100px;background:#b3d0b4;bottom:-72px;left:-30px;transform:rotate(5deg);border-radius:50%;z-index:-1}.badge{position:absolute;right:10px;top:10px;font-size:10px;border-radius:20px;background:#d9efd2;color:#315d30;padding:5px 10px}.cover-spark{display:block;text-align:center;color:#dc936b;font-size:21px;margin:17px 0 5px}.cover h3{font:bold clamp(25px,2.5vw,39px)/1.1 var(--serif);margin:0;text-align:center;letter-spacing:-1px}.cover-math{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:25px 0}.cover-math .tenframe{width:45%;max-width:180px}.cover-math strong{font:bold clamp(23px,2.7vw,39px) var(--serif);white-space:nowrap}mark{background:#ffcabf;color:inherit;border-radius:8px;padding:3px}.cover-bottom{display:flex;justify-content:space-between;gap:20px;font-size:10px;margin:20px 0 6px}.material-title{font-size:18px;margin:10px 0 0}.muted{color:var(--muted);font-size:13px;margin:2px 0 12px}.button-row{display:flex;gap:9px;margin:13px 0 16px}.primary,.outline{display:inline-flex;align-items:center;justify-content:center;border-radius:6px;padding:10px 12px;text-decoration:none;text-align:center;font-size:13px;border:1px solid #3d8277;background:#fff;color:#205c53}.primary{background:var(--teal);color:#fff}.button-row>*{flex:1}.primary:hover,.send:hover{background:#174e47}.outline:hover{background:#eff6ed}.file-row{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);padding:11px;border:1px solid var(--line);border-radius:10px;margin-top:9px;font-size:12px}.file-row small{display:block;margin-top:4px;color:var(--muted)}.file-icon{font-weight:bold;font-size:21px;color:white;border-radius:5px;width:33px;height:40px;display:grid;place-items:center;flex-shrink:0}.blue{background:#508ce6}.coral{background:#e9675c}.download-icon{font-size:24px;margin-left:auto}.recent-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.mini-cover{text-align:left;position:relative;min-height:150px;border:1px solid #e8e6db;border-radius:9px;padding:18px 14px;background:#fde5dc;overflow:hidden}.mini-cover strong{font: bold 23px/1.05 var(--serif);position:relative;z-index:1}.mini-cover>span{position:absolute;right:8px;bottom:18px;font-size:50px}.mini-cover small{position:absolute;bottom:7px;left:12px;font-size:10px}.mini-cover.science{background:#e8ecd2}.mini-cover.reading:after{content:'';position:absolute;width:100px;height:80px;border-radius:50%;background:#cce2f3;right:-20px;bottom:-35px}footer{display:flex;justify-content:space-between;font-size:10px;color:#728087;padding:15px 3px 0}.mobile-menu{display:none}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0)}.skip{position:fixed;top:-100px;left:10px;z-index:100;background:white;padding:10px}.skip:focus{top:10px}dialog{width:min(650px,calc(100% - 28px));border:1px solid var(--line);border-radius:16px;padding:24px;color:var(--ink);box-shadow:0 20px 100px #142e3d40;max-height:90vh}dialog::backdrop{background:#112f3c70}.modal-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:20px}.icon-button{border:0;background:#f0f3ed;width:35px;height:35px;border-radius:50%;font-size:23px}.modal-note{padding:13px;border-radius:8px;background:#f5f0e5;font-size:13px}#modal-body label{display:block;margin:13px 0 4px}#modal-body input,#modal-body select{width:100%;border:1px solid #b5c7bc;border-radius:6px;padding:10px}.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);background:#173e3e;color:white;padding:12px 20px;border-radius:10px;z-index:30;box-shadow:0 4px 15px #0002;font-size:13px}.library-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.library-card{border:1px solid var(--line);border-radius:10px;padding:20px;background:#faf8f0}.library-card h3{font:24px var(--serif);margin:0 0 8px}.library-card .outline{margin-top:10px}.lesson-options{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}.view>h2{margin-bottom:15px}

/* Reference composition: sidebar ~14%, planner/materials ~63/37. */
button:focus-visible,a:focus-visible,textarea:focus-visible,input:focus-visible,select:focus-visible{outline-color:#a65f0e}
.blue{background:#2863b5}.coral{background:#b9473c}
.sidebar{width:14.2%;min-width:174px;padding:22px 10px}
.brand{font-size:28px;padding:0 12px 22px}.brand small{font-size:21px;white-space:nowrap}.brand svg{width:72px;margin:0 auto 12px}
.nav{font-size:13px;padding:12px 10px;gap:12px;margin:3px 0;border-radius:8px}.nav span{width:21px;display:flex}.nav svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.privacy{padding:12px 10px;font-size:11px;margin-bottom:0}.privacy p{line-height:1.4}
main{margin-left:max(14.2%,174px);padding:18px 22px 12px}
header{margin:0 3px 12px}h1{font-size:clamp(29px,2.85vw,43px);letter-spacing:-1px}.sprout{font-size:32px}header p{font-size:14px}.avatar{width:37px;height:37px;font-size:19px}
.demo-banner{padding:6px 10px;margin-bottom:10px;font-size:11px}.demo-banner strong{font-size:9px}
.workspace-grid{grid-template-columns:minmax(0,1.63fr) minmax(0,1fr);gap:12px}
.panel{padding:16px;border-radius:10px}h2{font-size:21px}.section-heading{margin-bottom:14px}.section-heading .text-button{font-size:11px}
.subjects{gap:6px;margin:12px 0 18px}.chip{padding:6px 10px;font-size:11px}
.message{font-size:12px;padding:12px 14px}.message.user{max-width:73%;margin-bottom:12px}.attachment{font-size:11px;padding:8px;margin-top:8px}.assistant-line{margin:12px 0;gap:9px}.assistant-avatar{width:32px;height:32px;font-size:23px}.assistant-line p{padding:8px 12px;font-size:12px}
.activities{gap:8px}.activity{padding:10px 9px;font-size:11px;border-radius:9px;display:flex;flex-direction:column}.activity header{gap:7px;margin:0 0 10px;min-height:40px}.activity h3{font-size:15px}.number{width:21px;height:21px;font-size:11px;background:#b94e38}.activity:nth-child(2) .number{background:#4c7042}.activity p{margin:10px 0;line-height:1.4}.activity li{margin-top:7px}.activity ul{margin:0 0 12px}.activity .detail{margin-top:auto;font-size:11px;padding:7px 4px}.activity-art{height:108px;flex-shrink:0}.tenframe{width:135px}.bonds{height:101px}.problem{padding:8px;font-size:10px}.problem b{font-size:17px}.review-note{font-size:10px;margin:12px 0}
.composer{padding:10px 12px}.composer textarea{font-size:12px;min-height:42px}.send{width:36px;height:36px;font-size:18px}
.cover{padding:18px 16px 10px}.cover-spark{margin:15px 0 6px;font-size:19px}.cover h3{font-size:clamp(24px,2.4vw,35px)}.cover-math{gap:10px;margin:22px 0}.cover-math strong{font-size:clamp(23px,2.45vw,36px)}.cover-bottom{font-size:9px;margin:17px 0 5px;gap:10px}.badge{font-size:9px;padding:4px 8px}.material-title{font-size:16px}.muted{font-size:11px}.button-row{gap:7px;margin:10px 0 12px}.button-row>*{padding:8px 5px;font-size:11px}.file-row{padding:9px 6px;font-size:11px;gap:9px;border-width:0 0 1px;border-radius:0}.file-icon{width:27px;height:33px;font-size:17px}.file-row small{font-size:10px}.download-icon{font-size:19px}.mini-cover{min-height:135px;padding:14px 10px}.mini-cover strong{font-size:21px}.mini-cover>span{font-size:42px;right:3px}.right-column{gap:12px}footer{color:#586774}
.message,.assistant-line p,.attachment,.activity,.file-row>span,.library-card{overflow-wrap:anywhere;min-width:0}
.activity header{justify-content:flex-start}
button:disabled{cursor:wait;opacity:.65}
@media(max-width:1199px) and (min-width:701px){
 .sidebar{width:174px}.brand{padding-left:5px;font-size:25px}.brand small{font-size:19px}main{margin-left:174px;padding:18px 14px}.workspace-grid{grid-template-columns:1fr}.right-column{display:grid;grid-template-columns:1.2fr 1fr;align-items:start}.recent-grid{grid-template-columns:1fr}.settings>span:last-child{display:none}.library-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:700px){
 .sidebar{position:static;width:auto;min-width:0;padding:12px 18px}.brand{display:flex;align-items:center;gap:12px;padding:0;font-size:22px}.brand svg{width:43px;margin:0}.brand small{font-size:17px}.sidebar nav,.privacy{display:none}.sidebar.expanded nav{display:block}.sidebar.expanded .privacy{display:flex;margin:15px 0 0}.sidebar nav{padding-top:12px}
 main{margin:0;padding:18px 12px}.mobile-menu{display:block;background:none;border:0;padding:0 0 12px;color:var(--teal)}header{align-items:flex-start;margin:0 2px 14px;gap:4px}h1{font-size:30px;letter-spacing:-.6px}.sprout{font-size:26px}header p{font-size:14px}.avatar{display:none}.settings{padding:3px 0;font-size:21px}.settings>span:last-child{display:none}.panel{padding:14px}h2{font-size:21px}.subjects{gap:6px;margin-bottom:18px}.chip{font-size:12px;padding:8px 11px}.message.user{max-width:94%;font-size:13px}
 .workspace-grid{grid-template-columns:minmax(0,1fr)}.activities{grid-template-columns:minmax(0,1fr)}.activity{display:grid;grid-template-columns:100px minmax(0,1fr);gap:0 10px;font-size:12px}.activity header{grid-column:1/3;min-height:0}.activity-art{height:110px}.activity-art .tenframe{width:96px}.activity ul{margin-top:0}.activity>p{margin-top:0}.activity .detail{grid-column:1/3}.activity .activity-art{grid-row:2/4}.activity h3{font-size:20px}.right-column{display:flex}.recent-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.mini-cover{min-height:150px}.mini-cover strong{font-size:20px}.composer-actions{align-items:flex-end}.composer-actions>div{display:flex;flex-direction:column;align-items:flex-start}.section-heading{gap:8px}.section-heading h2{font-size:20px}.library-grid{grid-template-columns:1fr}footer{display:block;text-align:center}footer span{display:block;margin-top:4px}.demo-banner{font-size:11px}.cover h3{font-size:30px}.cover-math strong{font-size:28px}.cover-math{gap:8px}.cover-bottom{gap:8px}.problem{font-size:9px}.problem b{font-size:14px}
}
@media(max-width:700px){
 .activity-art .bonds{width:96px;height:100px;gap:8px 16px}.activity-art .bonds b{width:33px;height:33px;font-size:20px}.activity-art .bonds:before{left:30px}.activity-art .bonds:after{left:65px}
 .activity-art .problem{font-size:9px;line-height:1.3;padding:6px}.activity-art .problem b{font-size:12px}
 .mini-cover strong{display:block;max-width:85%;font-size:19px}.mini-cover>span{font-size:32px;bottom:22px}
}
@media(prefers-reduced-motion:no-preference){button,a{transition:background .15s ease,box-shadow .15s ease}}
.sidebar-toggle{align-self:flex-end;background:transparent;border:1px solid #547976;border-radius:6px;color:#fff;padding:6px 9px;font-size:12px;margin-bottom:14px}
.sidebar-toggle:hover{background:#32615d}
.sidebar-reopen{position:fixed;top:12px;left:14px;z-index:20;background:var(--deep);color:#fff;border:1px solid var(--teal);border-radius:6px;padding:8px 12px;font-size:13px}
body.sidebar-collapsed main{margin-left:0;padding-top:60px}