@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.block{display:block}.hidden{display:none}.grow{flex-grow:1}.resize{resize:both}}:root{--bg:#f7f8fc;--surface:#fff;--ink:#25334b;--muted:#536176;--action:#304568;--on-action:#fff;--hover:#233653;--line:#d6deea;--soft:#e8edf5;--accent:#8c6539;--accent-soft:#f2eadd;--success:#28634b;--success-bg:#e9f3ed;--error:#9b393b;--error-bg:#fff0ef;--focus:#7d97c7;--serif:Georgia, "Times New Roman", serif;--sans:Arial, Helvetica, sans-serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--bg:#101824;--surface:#172334;--ink:#e7edf6;--muted:#acbbcf;--action:#a9c1e7;--on-action:#13233b;--hover:#bfd1ed;--line:#34465f;--soft:#203047;--accent:#d5b080;--accent-soft:#322d27;--success:#a3d8bc;--success-bg:#1d352e;--error:#ffb5b5;--error-bg:#38252b;--focus:#b9cff1;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);font-family:var(--sans);margin:0;font-size:16px;line-height:1.6}button,input,textarea{font:inherit}a{color:inherit;text-underline-offset:4px}button,.button{background:var(--action);min-height:46px;color:var(--on-action);cursor:pointer;border:1px solid #0000;border-radius:8px;justify-content:center;align-items:center;gap:16px;padding:11px 21px;font-weight:600;line-height:1.4;text-decoration:none;display:inline-flex}button:hover,.button:hover{background:var(--hover)}button:disabled{opacity:.5;cursor:wait}.secondary{color:var(--action);border-color:var(--line);background:0 0}.secondary:hover{background:var(--soft)}.small{min-height:42px;padding:8px 14px;font-size:14px}:focus-visible{outline:3px solid var(--focus);outline-offset:4px}h1,h2,h3,p{margin:0 0 16px}h1,h2{font-family:var(--serif);letter-spacing:-.035em;font-weight:400;line-height:1.12}h1{font-size:clamp(36px,5vw,66px)}h2{font-size:32px}h3{font-size:21px;font-weight:500;line-height:1.35}h1 em{color:var(--action);font-weight:400}.eyebrow{letter-spacing:.13em;color:var(--muted);font-size:11px;font-weight:700;line-height:1.6}.lead{color:var(--muted);max-width:510px;font-size:19px;line-height:1.7}.muted{color:var(--muted)}.shell{max-width:1180px;margin:auto;padding:52px 32px}.narrow{max-width:680px;margin:0 auto;padding:64px 24px}.narrow>.eyebrow{margin-top:32px}.site-header{border-bottom:1px solid var(--line);background:var(--bg);justify-content:space-between;align-items:center;gap:16px;height:82px;padding:0 max(24px,50vw - 558px);display:flex}.wordmark{font-family:var(--serif);letter-spacing:-1px;align-items:center;gap:9px;font-size:28px;text-decoration:none;display:flex}.brand-mark{border:1px solid var(--action);width:32px;height:32px;color:var(--action);place-content:center;font-size:21px;display:grid}.wordmark-dot{color:var(--accent);margin-left:-9px}nav{align-items:center;gap:24px;display:flex}nav>a{font-size:14px;text-decoration:none}nav a[aria-current]{text-decoration:underline;text-decoration-thickness:2px}.icon-button{width:44px;color:var(--ink);background:0 0;border:0;padding:10px}.icon-button:hover{background:var(--soft)}.icon-button svg{fill:none;stroke:currentColor;stroke-width:1.6px;stroke-linecap:round;width:21px;height:21px}.nav-signout{color:var(--muted);background:0 0;padding:6px;font-size:13px}.nav-signout:hover{background:var(--soft)}.hero{grid-template-columns:1.1fr 1fr;align-items:center;gap:70px;min-height:640px;display:grid}.hero h1{margin:22px 0 26px}.actions{flex-wrap:wrap;gap:12px;margin:28px 0 20px;display:flex}.editorial-panel{background:var(--soft);border:1px solid var(--line);border-top:3px solid var(--action);border-radius:2px;padding:35px}.folio{letter-spacing:.1em;color:var(--accent);margin:22px 0;font-size:11px;display:block}.editorial-panel h2{font-size:36px}.cash-line{font-family:var(--serif);justify-content:space-between;align-items:center;margin:36px 0;font-size:32px;display:flex}.cash-line small{font-family:var(--sans);letter-spacing:.1em;color:var(--muted);font-size:9px;display:block}.cash-line i{color:var(--muted);font-size:20px;font-style:normal}.unknown{color:var(--accent)}.rule{border-top:1px solid var(--line);margin:28px 0}.approach{border-top:1px solid var(--line);grid-template-columns:1.1fr 1fr 1fr;gap:50px;display:grid}.approach p{color:var(--muted)}.legal{color:var(--muted);border-top:1px solid var(--line);margin-top:28px;font-size:12px}.auth-shell{grid-template-columns:1fr 1fr;gap:80px;max-width:1050px;margin:70px auto;padding:0 28px;display:grid}.auth-shell h1{font-size:48px}.auth-note{background:var(--soft);flex-direction:column;justify-content:center;align-self:stretch;padding:50px;display:flex}.auth-note h2{font-size:42px}.auth-note p{color:var(--muted)}form{gap:18px;margin-top:24px;display:grid}label{gap:7px;font-size:14px;font-weight:500;display:grid}input,textarea{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:7px;width:100%;min-width:0;padding:13px 14px}textarea{resize:vertical;font-size:16px}label small,.small-copy{color:var(--muted);font-size:12px}.error,.notice{border-radius:7px;padding:12px 16px;font-size:14px}.error{background:var(--error-bg);color:var(--error)}.notice{background:var(--success-bg);color:var(--success)}.course-heading{justify-content:space-between;align-items:center;gap:24px;display:flex}.course-heading h1{font-size:48px}.course-label{text-align:right;letter-spacing:.08em;font-size:13px}.course-label small{color:var(--muted);font-size:10px}.continue-panel{border-left:3px solid var(--action);background:var(--soft);justify-content:space-between;align-items:center;gap:36px;margin:32px 0 56px;padding:32px;display:flex}.continue-panel p:last-child{max-width:650px;color:var(--muted);margin-bottom:0}.continue-panel .button{flex-shrink:0}.section-heading{justify-content:space-between;align-items:end;gap:24px;margin-bottom:24px;display:flex}.section-heading h2{margin-bottom:0}.lesson-list{border-top:1px solid var(--line)}.lesson-row{border-bottom:1px solid var(--line);grid-template-columns:48px 1fr 110px;gap:26px;padding:27px 12px;text-decoration:none;transition:background .15s;display:grid}.lesson-row:hover{background:var(--soft)}.lesson-row h3{margin:4px 0 7px}.lesson-row p{color:var(--muted);max-width:710px;margin-bottom:12px;font-size:14px}.lesson-number{font-family:var(--serif);color:var(--muted);font-size:27px}.lesson-state{text-align:right;color:var(--muted);font-size:12px}.lesson-state b{color:var(--action);margin-top:10px;font-size:25px;font-weight:400;display:block}.mini-progress,.progress{background:var(--line);border-radius:6px;height:4px;overflow:hidden}.mini-progress{max-width:280px;height:3px}.mini-progress span,.progress span{background:var(--action);height:100%;transition:width .25s;display:block}.lesson-workspace{max-width:1400px;height:calc(var(--viewport,100dvh) - 82px);grid-template-columns:310px 1fr;margin:auto;display:grid;overflow:hidden}.lesson-aside{border-right:1px solid var(--line);padding:35px 28px;overflow-y:auto}.lesson-aside>a{font-size:14px;text-decoration:none}.lesson-aside .eyebrow{margin-top:40px}.lesson-aside h1{font-size:31px}.lesson-aside p{color:var(--muted);font-size:14px}.note{background:var(--accent-soft);color:var(--accent);margin:30px 0;padding:16px;font-size:13px;display:block}.conversation{flex-direction:column;min-width:0;min-height:0;display:flex}.chat{overscroll-behavior:contain;scroll-behavior:smooth;flex:1;min-height:0;padding:24px max(28px,50% - 370px);overflow-y:auto}.message{max-width:680px;margin:18px 0 28px}.message p{white-space:pre-wrap;overflow-wrap:anywhere;margin:8px 0 0;line-height:1.75}.message.learner{background:var(--soft);border-radius:12px 12px 2px;max-width:88%;margin-left:auto;padding:16px 20px}.message.teacher>.eyebrow{color:var(--action)}.optional{border-left:2px solid var(--accent);color:var(--muted);margin-top:15px;padding:8px 14px;font-size:14px}.optional strong{color:var(--accent);font-weight:500}.composer-area{border-top:1px solid var(--line);max-height:60%;padding:12px 28px 18px;overflow-y:auto}.composer-area form{gap:10px;margin:0}.composer{background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden}.composer textarea{resize:none;background:0 0;border:0;border-radius:0;min-height:78px;max-height:160px;padding:16px}.composer-controls{justify-content:space-between;align-items:center;gap:12px;padding:0 12px 10px;display:flex}.help-button{color:var(--action);background:0 0;padding:8px;font-size:14px;font-weight:500}.help-button:hover{background:var(--soft)}.input-note{color:var(--muted);font-size:11px}.choices{border:0;flex-wrap:wrap;gap:8px;margin:0;padding:0;display:flex}.choices legend{color:var(--muted);margin-bottom:8px;font-size:12px}.choices label{background:var(--surface);border:1px solid var(--line);cursor:pointer;border-radius:7px;flex:1;align-items:center;gap:10px;min-width:140px;padding:12px;font-size:13px;display:flex}.choices label.selected{background:var(--soft);border-color:var(--action)}.choices input{width:16px;accent-color:var(--action);flex-shrink:0}.thinking{color:var(--muted);align-items:center;gap:10px;padding-bottom:15px;font-size:14px;display:flex}.thinking span{gap:4px;display:flex}.thinking i{background:var(--action);border-radius:50%;width:5px;height:5px;animation:1.2s infinite pulse}.thinking i:nth-child(2){animation-delay:.2s}.thinking i:nth-child(3){animation-delay:.4s}.next-row{justify-content:space-between;align-items:center;gap:16px;display:flex}.next-row p{margin:0}.completion{padding:20px 0}.completion h2{font-size:29px}.prose p{line-height:1.8}.prose h2{margin-top:35px}.skeletons{gap:20px;padding:30px 0;display:grid}.skeleton{background:var(--soft);border-radius:7px;width:50%;height:22px;animation:1.5s infinite pulse}.skeleton.long{width:70%;height:40px}.skeleton.tall{width:100%;height:170px}.sr-only,.skip:not(:focus){clip:rect(0, 0, 0, 0);width:1px;height:1px;position:absolute;overflow:hidden}.skip:focus{z-index:10;background:var(--surface);padding:12px;position:fixed}@keyframes pulse{50%{opacity:.5}}@media (max-width:900px){.hero{gap:30px}.hero h1{font-size:49px}.lesson-workspace{grid-template-columns:240px 1fr}.lesson-aside{padding:25px 20px}.auth-shell{gap:35px}.auth-note{padding:28px}}@media (max-width:700px){.site-header{height:66px;padding:0 16px}.wordmark{font-size:24px}.brand-mark{display:none}nav{gap:14px}nav>a{font-size:12px}.nav-signout{font-size:11px}.shell{padding:34px 20px}.hero,.approach,.auth-shell{grid-template-columns:1fr}.hero{gap:30px;min-height:0}.hero h1{font-size:48px}.editorial-panel{padding:25px}.approach{gap:20px}.auth-shell{margin:36px auto;padding:0 22px}.auth-shell h1{font-size:38px}.auth-note{display:none}.course-heading{align-items:start}.course-heading h1{font-size:35px}.course-label{white-space:nowrap;font-size:10px}.course-label small{font-size:8px}.continue-panel{margin:25px 0 35px;padding:22px;display:block}.continue-panel .button{margin-top:20px}.continue-panel h2{font-size:27px}.section-heading{display:block}.section-heading>span{margin-top:12px;font-size:12px;display:block}.section-heading h2{font-size:29px}.lesson-row{grid-template-columns:30px 1fr;gap:12px;padding:22px 0}.lesson-row .lesson-state{text-align:left;grid-column:2;justify-content:space-between;align-items:center;display:flex}.lesson-state b{margin:0;font-size:20px}.lesson-row h3{font-size:19px}.lesson-row p{font-size:13px}.lesson-workspace{height:calc(var(--viewport,100dvh) - 66px);flex-direction:column;display:flex}.lesson-aside{border-right:0;border-bottom:1px solid var(--line);grid-template-columns:1fr auto;align-items:center;gap:5px 12px;padding:10px 18px;display:grid;overflow:visible}.lesson-aside>a{font-size:12px}.lesson-aside h1{font-family:var(--sans);letter-spacing:0;grid-column:1/-1;margin:0;font-size:15px}.lesson-aside .eyebrow,.lesson-aside>p,.lesson-aside .note,.lesson-aside>button{display:none}.lesson-aside .progress{grid-column:1/-1;height:3px;margin:4px 0}.conversation{flex:1}.chat{padding:8px 18px}.message{margin:14px 0 22px;font-size:15px}.message.learner{padding:12px 16px}.composer-area{padding:8px 12px 12px}.composer textarea{min-height:60px;padding:12px}.composer-controls{padding:0 8px 8px}.choices{gap:5px}.choices label{min-width:100%;min-height:44px;padding:9px;font-size:12px}.input-note{display:none}.next-row{gap:8px}.next-row p{font-size:12px}.next-row button{font-size:13px}.narrow{padding:35px 22px}.legal{font-size:11px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}