:root{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#293b32;background:#faf9f5;font-synthesis:none;font-weight:400;--green:#244d3e;--muted:#7d877f;--line:#e4e7df;--paper:#faf9f5;--accent:#b56f49}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a,input,textarea,summary{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button{border:0;color:inherit;background:none}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}input:focus,textarea:focus{outline:none}h1,h2,p{margin:0}h1,h2{font-weight:500}h1{font-family:Georgia,Times New Roman,serif;letter-spacing:-.045em;line-height:1.1}h2{letter-spacing:-.02em}.eyebrow{display:block;font-size:10px;letter-spacing:.13em;font-weight:650;color:#7e8a80;line-height:1.5}em{font-weight:400;color:#527562}.quiet{color:var(--muted);font-size:12px;line-height:1.7}.brand{display:flex;align-items:center;gap:7px;font-size:28px;font-weight:650;letter-spacing:-1.6px}.brand svg{width:26px;height:26px;color:#57735b}.brand>span{letter-spacing:.15em;font-size:8px;color:var(--muted);margin-left:7px;font-weight:500;padding-top:5px}.primary{display:flex;align-items:center;justify-content:space-between;gap:30px;background:var(--green);color:#fff;padding:16px 20px;border-radius:7px;font-size:13px;transition:background .15s,transform .15s}.primary:hover{background:#30624e}.primary:active{transform:scale(.98)}.login{min-height:100dvh;display:grid;grid-template-columns:1.2fr 1fr}.login-story{background:#eef0e7;padding:44px 8vw;display:flex;flex-direction:column;justify-content:space-between;gap:80px}.login-story h1{font-size:clamp(48px,5.3vw,82px);margin:24px 0;line-height:1.06}.login-story p{max-width:350px;font-size:15px;line-height:1.8;color:#758174}.login-form{align-self:center;justify-self:center;width:310px;max-width:calc(100vw - 48px)}.login-form h2{font-family:Georgia,serif;font-size:36px;line-height:1.2;margin:17px 0 38px}.login-form label{display:block;font-size:12px;margin-bottom:10px}.login-form input{width:100%;padding:14px;border:1px solid #d9dfd3;background:#fff;border-radius:6px;box-shadow:0 1px 2px #263c2610}.login-form input:focus{border-color:#8a9c87;box-shadow:0 0 0 3px #92a18d1a}.login-form .primary{width:100%;margin:13px 0 25px}.error{color:#9f4b3a;font-size:13px;margin:14px 0;line-height:1.5}.loading{min-height:100dvh;display:flex;align-items:center;justify-content:center;gap:15px;color:#65806c;font-size:14px}.app-shell{display:flex;min-height:100dvh}.sidebar{position:fixed;inset:0 auto 0 0;width:234px;background:#f1f2eb;border-right:1px solid var(--line);padding:28px 19px 20px;display:flex;flex-direction:column}.sidebar .brand{margin:0 7px 33px}.sidebar .brand>span{font-size:7px}.learner{display:flex;align-items:center;gap:9px;margin:0 7px 30px}.avatar{width:32px;height:32px;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;font-family:Georgia,serif;background:#e6d7c7;color:#7d604b;border-radius:50%;font-size:17px}.learner strong{display:block;font-size:11px;font-weight:600}.learner small{display:block;font-size:9px;color:var(--muted);margin-top:4px}.nav{display:flex;align-items:center;gap:11px;width:100%;padding:12px 13px;margin-bottom:3px;text-align:left;font-size:12px;border-radius:6px;color:#738075}.nav.active{background:#e1e8dc;color:#2e513b;font-weight:600}.nav:hover:not(.active){background:#e8ece3}.sidebar-divider{border-top:1px solid #dfe4d9;margin:25px 7px 19px}.new-session{display:flex;gap:9px;align-items:center;font-size:11px;font-weight:550;padding:8px 10px;text-align:left}.section-label{display:block;font-size:8px;letter-spacing:.12em;color:#8b9588;margin:24px 12px 9px}.recent{overflow:auto}.recent button{display:flex;width:100%;text-align:left;flex-direction:column;gap:5px;padding:9px 12px;border-radius:5px;margin-bottom:2px}.recent button span{font-size:10px;line-height:1.4}.recent button small{font-size:9px;color:#899387}.recent button.selected{background:#e8ece2}.recent .quiet{padding:0 12px;font-size:10px}.sidebar-bottom{margin-top:auto;padding:30px 9px 0}.language-note{font-size:8px;line-height:1.6;color:#8a9488;display:flex;gap:5px;align-items:center}.dot{display:inline-block;flex-shrink:0;width:5px;height:5px;border-radius:50%;background:#89a17c}.text-button{display:inline-flex;align-items:center;gap:7px;font-size:11px;color:#536d58;padding:10px 0}.sidebar-bottom .text-button{font-size:9px;margin-top:10px;color:#82907f}.main{margin-left:234px;width:calc(100% - 234px);min-width:0}.topbar{height:63px;padding:0 36px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:8px;letter-spacing:.13em;color:#8a948b}.topbar .year{font-size:9px;letter-spacing:0;color:#8c958b}.year span{padding:0 5px;color:#b6beb1}.welcome{max-width:850px;margin:0 auto;padding:90px 65px 50px}.welcome h1{font-size:72px;margin:24px 0}.welcome>p{font-size:15px;line-height:1.8;color:#7a857a;max-width:430px}.welcome .primary{margin:32px 0 80px}.welcome-footer{border-top:1px solid var(--line);padding-top:18px;display:flex;gap:25px;justify-content:space-between;color:#8a9488;font-size:10px}.welcome-footer span:first-child{font-size:8px;letter-spacing:.1em}.session-heading{display:flex;justify-content:space-between;align-items:center;gap:25px;padding:32px 36px 27px}.session-heading h1{font-size:32px;margin-top:8px}.session-state{display:flex;gap:6px;align-items:center;font-size:9px;white-space:nowrap;color:#899481}.study-layout{display:grid;grid-template-columns:minmax(320px,1fr) minmax(330px,.98fr);gap:26px;padding:0 28px 18px 36px;height:calc(100dvh - 177px);min-height:560px}.conversation{display:flex;flex-direction:column;min-height:0;min-width:0}.messages{overflow:auto;min-height:0;flex:1;padding:0 12px 15px 0;scrollbar-width:thin;scrollbar-color:#dfe4d8 transparent}.activity{background:#f0f2e9;border:1px solid #e5e9dc;border-radius:8px;margin:0 0 25px}.activity summary{display:flex;align-items:center;gap:10px;cursor:pointer;padding:13px 14px;list-style:none;font-size:10px;color:#65785b;font-weight:550}.activity summary::-webkit-details-marker{display:none}.activity summary>svg{margin-left:auto}.activity-number{font-family:Georgia,serif;background:#dfe7d4;color:#6c805c;padding:3px 6px;font-size:12px;border-radius:3px}.activity p{padding:0 17px 17px;font-size:12px;line-height:1.9;color:#5b6f54}.coach-mark{width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;color:#687d5b;background:#e8eddf;flex-shrink:0}.first-note{display:flex;gap:10px;padding:3px 4px 25px}.first-note strong{font-size:12px;font-weight:550}.first-note p{font-size:12px;color:#7b8778;line-height:1.8;margin-top:8px}.message{margin:22px 0 30px}.message-byline{display:flex;align-items:center;gap:8px;font-size:10px;font-weight:550;color:#5b705b;margin-bottom:10px}.message-byline small{font-size:9px;font-weight:400;color:#9aa28e}.avatar.tiny{width:23px;height:23px;font-size:12px}.message.user .markdown{background:#f0eee7;padding:13px 15px;border-radius:0 9px 9px;font-size:12px;color:#67705d}.markdown{font-size:12px;line-height:1.85;color:#4b604e;overflow-wrap:anywhere}.markdown p{margin:0 0 12px}.markdown p:last-child{margin-bottom:0}.markdown ul,.markdown ol{padding-left:20px;margin:10px 0}.markdown pre{overflow:auto;background:#edf0e7;border-radius:6px;padding:12px;font-size:11px;line-height:1.65;white-space:pre}.markdown code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:11px}.markdown p code{background:#e9ede2;padding:2px 4px;border-radius:3px}.markdown h1,.markdown h2,.markdown h3{font-size:14px;font-family:inherit;letter-spacing:0;margin:16px 0 8px}.markdown a{text-decoration:underline}.composer{border:1px solid #dbe2d4;background:#fffefa;border-radius:10px;box-shadow:0 2px 3px #34462b04;padding:12px 12px 9px;margin-top:10px}.composer:focus-within{border-color:#a9b99e}.composer textarea{display:block;resize:vertical;min-height:52px;max-height:180px;width:100%;border:0;background:none;padding:0;font-size:12px;line-height:1.7;color:#38503e}.composer textarea::placeholder{color:#9aa18f}.composer-footer{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:7px}.composer-footer>span{display:flex;gap:4px;align-items:center;font-size:8px;color:#9ca38f}.send{width:31px;height:31px;background:var(--green);color:#fff;border-radius:6px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.send:disabled{opacity:.35}.send.stop{background:#917960}.composer-hint{font-size:8px;color:#9da68e;text-align:center;padding:11px 0 3px;line-height:1.6}.workspace{display:flex;flex-direction:column;min-height:0;min-width:0;background:#fffefb;border:1px solid #e0e5d9;border-radius:9px;overflow:hidden;box-shadow:0 3px 10px #2f492705}.workspace-header{display:flex;align-items:center;justify-content:space-between;gap:10px;border-bottom:1px solid var(--line);padding:15px 17px}.workspace-header>div{display:flex;gap:8px;align-items:center;color:#65775f}.workspace-header strong{font-size:10px;font-weight:550}.workspace-header>span{font-size:8px;display:flex;align-items:center;gap:3px;color:#8e9b81}.workspace-header .save-error{color:#b26146}.file-tab{display:flex;justify-content:space-between;font-size:9px;color:#6c7e60;padding:11px 17px;background:#f6f7f0;border-bottom:1px solid #eef0e9;font-family:ui-monospace,monospace}.file-tab span{color:#a0a892;font-family:inherit;font-size:8px}.code-editor{flex:1;min-height:185px;overflow:auto}.code-editor>.cm-theme{height:100%}.cm-editor{font-size:11px!important;height:100%;background:#fffefb!important}.cm-content{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;line-height:1.85;padding:13px 0!important}.cm-gutters{background:#fffefb!important;border:0!important;color:#b2b9a6!important;font-size:9px}.cm-lineNumbers .cm-gutterElement{padding:0 10px 0 9px!important}.cm-activeLine,.cm-activeLineGutter{background:#f4f6ed!important}.cm-focused{outline:none!important}.run-bar{display:flex;align-items:center;justify-content:space-between;padding:11px 15px;border-top:1px solid #edf0e5}.run-bar>span{font-size:8px;color:#a3ab96}.run-button{display:flex;align-items:center;gap:7px;color:#446040;background:#ecf1e3;border:1px solid #dce5cf;border-radius:5px;padding:7px 10px;font-size:9px;font-weight:550}.run-button:hover{background:#e2ebd6}.output{min-height:154px;max-height:35%;overflow:auto;background:#f5f6ee;padding:14px 17px;border-top:1px solid var(--line)}.output-heading{display:flex;justify-content:space-between;font-size:8px;color:#87977b;margin-bottom:15px;gap:10px}.output-heading span:first-child{display:flex;align-items:center;gap:6px;letter-spacing:.09em}.output pre{font:10px/1.75 ui-monospace,SFMono-Regular,monospace;white-space:pre-wrap;overflow-wrap:anywhere;color:#576a4e;max-height:180px;overflow:auto}.output>p{font-size:10px;line-height:1.85;color:#a0aa90;padding:5px 0 12px}.execution-label{font-size:8px;display:block;color:#78916a;padding:8px 0 0}.execution-label.error,.execution-label.timeout{color:#a9704d;margin:0}.workspace-footnote{font-size:8px;color:#a8ad9a;line-height:1.7;padding:10px 15px;border-top:1px solid #e9ecdf;background:#fafbf5}.working{display:flex;gap:7px;align-items:center;color:#95a186;font-size:10px;padding:5px}.run-notice{border-left:2px solid #c5cdb8;padding:10px 14px;font-size:11px;color:#7d896e;line-height:1.7;margin:15px 0}.run-notice button{padding:8px 0;display:flex;align-items:center;gap:7px;font-size:10px;color:#477044}.error-banner{display:flex;align-items:flex-start;gap:9px;margin:16px 30px;padding:13px 15px;border:1px solid #ecd8c8;background:#f6ece2;color:#9b654c;border-radius:6px;font-size:11px;line-height:1.6}.error-banner svg{flex-shrink:0}.error-banner button{margin-left:auto;font-size:18px}.document-page{max-width:1000px;margin:0 auto;padding:50px 55px 70px}.document-page h1{font-size:43px;margin:10px 0 20px}.page-title{display:flex;align-items:center;justify-content:space-between;gap:20px}.intro{max-width:560px;line-height:1.85;font-size:14px;color:#87917e;margin-bottom:35px}.outline-button{display:flex;align-items:center;gap:7px;padding:9px 12px;border:1px solid #dce2d4;border-radius:5px;font-size:10px;white-space:nowrap}.empty-state{border-top:1px solid var(--line);padding:65px 10px;color:#a0ad90}.empty-state h2{color:#728663;font-family:Georgia,serif;font-size:27px;margin:20px 0 10px}.empty-state p{font-size:12px;line-height:1.8;max-width:400px;color:#9aa48c}.empty-state .text-button{margin-top:15px}.checkpoint{padding:24px 0;border-top:1px solid var(--line)}.checkpoint>div:first-child{display:flex;justify-content:space-between;align-items:center}.checkpoint time{font-size:10px;color:#a2aa95}.checkpoint-state{padding:4px 7px;background:#e8edde;border-radius:4px;font-size:9px;color:#708961}.checkpoint h2{font-size:20px;margin:16px 0 10px}.checkpoint>p,.next-step p{font-size:12px;line-height:1.8;color:#7d8b71}.next-step{background:#f0f3e9;padding:14px 16px;margin:16px 0;border-radius:5px}.next-step>span{font-size:8px;letter-spacing:.1em;color:#9da98e;display:block;margin-bottom:5px}.checkpoint>small{display:block;font-size:9px;color:#a6af98}.course-note{border-left:2px solid #b7c59f;padding:3px 0 3px 14px;font-size:11px;color:#8c997c;line-height:1.8;margin-bottom:30px}.topic-list article{display:flex;gap:22px;padding:23px 0;border-top:1px solid var(--line);align-items:center}.topic-index{font:24px Georgia,serif;color:#b6c1a6;align-self:flex-start;padding-top:6px}.topic-list h2{font-size:17px;margin:5px 0 7px}.topic-list .eyebrow{font-size:8px}.topic-list p{font-size:11px;color:#8e9a80;line-height:1.7}.topic-list article>button,.topic-kind{margin-left:auto;flex-shrink:0}.topic-list button{width:39px;height:39px;background:#e8edde;border-radius:50%;color:#8b9d73}.topic-kind{font-size:8px;color:#b3bca6}.sources-title{font-family:Georgia,serif;font-size:27px;margin:35px 0 20px}.sources{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:28px}.sources>a{padding:17px;background:#f1f3e9;border:1px solid #e6eadb;border-radius:6px}.sources>a>div{display:flex;justify-content:space-between;gap:10px;font-size:10px}.sources strong{font-weight:550}.sources p{font-size:9px;color:#93a17f;line-height:1.6;margin:9px 0}.sources small{font-size:8px;color:#acb69b}.mobile-tabs{display:none}@media(min-width:1500px){.study-layout{grid-template-columns:minmax(360px,1fr) minmax(400px,.9fr);gap:45px;padding-left:55px;padding-right:45px}.session-heading{padding-left:55px}.markdown,.first-note p,.activity p,.composer textarea{font-size:14px}.workspace-header strong{font-size:12px}.cm-editor{font-size:13px!important}.output pre{font-size:12px}.output>p{font-size:12px}.composer-hint,.workspace-footnote{font-size:10px}}@media(max-width:1100px){.sidebar{width:195px;padding:22px 12px}.sidebar .brand>span{font-size:6px;letter-spacing:.1em}.main{margin-left:195px;width:calc(100% - 195px)}.study-layout{padding:0 20px 18px;gap:17px;grid-template-columns:minmax(270px,1fr) minmax(270px,1fr)}.topbar{padding:0 23px}.session-heading{padding:28px 23px}.session-heading h1{font-size:28px}.session-heading .eyebrow{font-size:8px}.session-state{display:none}.document-page{padding:40px 30px}.topbar .year{font-size:8px}}@media(max-width:880px){.sidebar{position:static;width:100%;height:auto;padding:14px 18px;display:block;border-right:0;border-bottom:1px solid var(--line)}.sidebar .brand{margin:0;font-size:24px}.sidebar .brand>span{font-size:7px}.sidebar nav{display:flex;margin-top:15px;gap:8px}.nav{justify-content:center;margin:0;padding:10px 5px;font-size:11px}.learner,.sidebar-divider,.new-session,.section-label,.recent,.sidebar-bottom{display:none}.app-shell{display:block}.main{margin:0;width:100%}.topbar{height:41px;padding:0 20px;font-size:7px}.topbar .year{font-size:7px}.session-heading{padding:23px 20px 16px}.session-heading h1{font-size:29px}.mobile-tabs{display:flex;gap:20px;padding:0 20px 15px}.mobile-tabs button{font-size:11px;color:#9aa48c;padding:7px 0;border-bottom:2px solid transparent}.mobile-tabs .chosen{border-color:#627c51;color:#516945}.study-layout{display:block;height:calc(100dvh - 292px);min-height:420px;padding:0 16px 12px}.conversation,.workspace{display:none;height:100%}.mobile-visible{display:flex}.messages{padding:0 3px 10px}.activity p,.markdown,.first-note p,.composer textarea{font-size:13px}.composer-hint{font-size:9px}.workspace-header strong{font-size:12px}.cm-editor{font-size:12px!important}.output>p{font-size:11px}.output pre{font-size:11px}.workspace-footnote{font-size:9px}.document-page{padding:30px 23px}.document-page h1{font-size:35px}.sources{grid-template-columns:1fr}.topic-kind{display:none}.welcome{padding:50px 28px}.welcome h1{font-size:60px}.welcome .primary{margin-bottom:55px}.welcome-footer{flex-direction:column;gap:10px}.login{grid-template-columns:1fr}.login-story{padding:28px 30px;gap:45px;min-height:48dvh}.login-story h1{font-size:47px;margin:12px 0}.login-story p{font-size:12px;max-width:320px}.login-story>.quiet{display:none}.login-form{padding:40px 0 50px;width:calc(100% - 60px);max-width:400px}.login-form h2{font-size:30px;margin-bottom:25px}.page-title{align-items:flex-start}.outline-button{font-size:8px;padding:8px;margin-top:14px}.intro{font-size:12px}.error-banner{margin:10px 17px}.topic-list article{gap:15px}.topic-list h2{font-size:16px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.mobile-session-controls{display:none}@media(max-width:880px){.mobile-session-controls{display:flex;gap:8px;margin-top:10px;align-items:center}.mobile-session-controls select{flex:1;min-width:0;padding:7px 9px;border:1px solid #dbe2d4;border-radius:5px;color:#6b805b;background:#f6f7f0;font:10px inherit}.mobile-session-controls button{display:flex;align-items:center;justify-content:center;width:31px;height:31px;border:1px solid #dbe2d4;border-radius:5px;color:#789364}.study-layout{height:calc(100dvh - 333px)}}