:root{--forest:#173f3a;--forest2:#245c52;--cream:#f6f1e7;--paper:#fffdf8;--ink:#172522;--muted:#52635e;--line:#d4ded5;--danger:#9a3331;--shadow:0 12px 30px #193e3715}.number-grid{margin:1rem 0}.number-grid table{border-collapse:collapse;background:#fff}.number-grid td{border:2px solid var(--ink);width:3rem;height:3rem;text-align:center;font-weight:700}.number-grid figcaption{margin-top:.45rem;color:var(--muted);font-size:.9rem}.bar-chart,.coordinate-plane{margin:1rem 0;max-width:34rem}.bars{height:190px;border-left:2px solid var(--ink);border-bottom:2px solid var(--ink);display:flex;align-items:flex-end;gap:1rem;padding:0 1rem}.bar-column{height:100%;min-width:3rem;display:flex;flex-direction:column;justify-content:flex-end;align-items:center}.bar{display:block;width:2.25rem;background:var(--forest2);border:1px solid var(--forest)}.bar-label,.bar-value,.axis-label,.bar-chart figcaption,.coordinate-plane figcaption{font-size:.85rem;color:var(--muted)}.coordinate-plane svg{width:100%;max-width:32rem;background:#fff}.coordinate-plane rect,.coordinate-plane line{fill:none;stroke:var(--ink);stroke-width:1}.coordinate-plane circle{fill:var(--forest2)}.coordinate-plane text{font-weight:700;fill:var(--ink)}*{box-sizing:border-box}html{font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:var(--cream);color:var(--ink);scroll-behavior:smooth}body{margin:0;min-height:100vh}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.55;cursor:wait}a{color:var(--forest2)}:focus-visible{outline:3px solid #cc7c23;outline-offset:3px}.hidden{display:none!important}.skip{position:absolute;z-index:99;left:12px;top:-100px;background:white;padding:12px}.skip:focus{top:10px}.topbar{position:sticky;top:0;z-index:10;background:var(--paper);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px max(16px,env(safe-area-inset-left));min-height:64px}.brand{text-decoration:none;display:flex;gap:10px;align-items:center;font-weight:800;color:var(--forest);white-space:nowrap}.brand-mark{background:var(--forest);color:white;width:36px;height:36px;border-radius:10px;display:grid;place-items:center;font-family:Georgia,serif}.quiet{border:0;background:transparent;color:var(--forest);padding:10px;min-height:44px}.eyebrow{font-weight:800;letter-spacing:.13em;font-size:.76rem;color:var(--forest2)}h1,h2,h3,h4,p{overflow-wrap:anywhere}h1,h2{line-height:1.15}h1{font-family:Georgia,serif;font-size:clamp(2rem,5vw,3.5rem);font-weight:500}h2{font-family:Georgia,serif;font-size:clamp(1.6rem,3vw,2.3rem);font-weight:500}h3{font-size:1.12rem}.muted,.empty{color:var(--muted)}.gate{padding:35px 18px;max-width:1000px;margin:auto;display:grid;gap:22px;align-items:center}.intro h1{margin:12px 0}.intro em{color:var(--forest2)}.intro p:last-child{line-height:1.6;color:var(--muted)}.login-card,.panel,.item,.child-card{background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.login-card,.panel{padding:20px}.tabs,.detail-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}.tabs button,.detail-tabs button,.side-nav button{border:1px solid var(--line);background:transparent;color:var(--forest);padding:11px 14px;border-radius:12px;min-height:44px;font-weight:650}.tabs button.active,.detail-tabs button[aria-pressed=true],.side-nav button[aria-current=page]{background:var(--forest);color:white;border-color:var(--forest)}form label{display:block;font-weight:650;margin:12px 0 6px}input:not([type=radio]):not([type=file]),select,textarea{width:100%;background:#fff;border:1px solid #aebcb1;border-radius:10px;color:var(--ink);padding:11px 12px;min-height:46px}textarea{resize:vertical;line-height:1.55}.primary,.secondary{border:1px solid var(--forest);border-radius:11px;padding:11px 18px;min-height:46px;font-weight:700;margin-top:14px}.primary{background:var(--forest);color:white}.secondary{background:white;color:var(--forest)}.error{color:var(--danger)}.workspace{max-width:1300px;margin:auto}.sidebar{padding:22px 18px;background:#e8ede5}.sidebar h1{margin:8px 0}.side-nav{display:flex;gap:8px;overflow-x:auto;padding:5px 0}.side-nav button{white-space:nowrap}.privacy{font-size:.85rem;color:var(--muted)}.content{padding:22px 16px 70px;min-width:0}.page{max-width:900px;margin:auto}.page>.panel{margin:18px 0}.hero{padding:6px 2px}.hero h2{margin:6px 0}.hero p:last-child{color:var(--muted)}.form-grid{display:grid;gap:12px}.composer-row{display:flex;align-items:end;gap:10px;flex-wrap:wrap}.composer-row label{width:100%;margin:0}.composer-row select{flex:1;min-width:180px}.composer-row button{margin:0}.file-label{display:block;color:var(--forest);font-weight:700}input[type=file]{max-width:100%;padding:10px 0}.conversation{display:grid;gap:12px;margin-top:20px}.message{padding:12px 16px;background:#eef4ed;border-radius:16px;white-space:pre-wrap;line-height:1.55}.message.user{background:#e7eee9;margin-left:min(12%,70px)}.message.assistant{background:#f9f6ed;margin-right:min(12%,70px)}.message p{margin:8px 0}.message small{color:var(--muted)}.card-list{display:grid;gap:12px;margin:18px 0}.item{padding:18px;min-width:0}.item h3{margin:8px 0}.item-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:12px}.item-actions button,.item button:not(.primary),.download{display:inline-block;border:1px solid var(--forest2);color:var(--forest);background:white;padding:9px 12px;border-radius:9px;font-weight:650;text-decoration:none;min-height:42px}.pill{display:inline-block;background:#e2eee4;color:var(--forest);padding:4px 9px;border-radius:99px;font-size:.8rem}.parent{max-width:1100px;margin:auto;padding:22px 16px 70px}.parent-head{margin-bottom:25px}.parent-head h1{margin:7px 0}.children{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.child-card{padding:18px;text-align:left;color:var(--ink);display:grid;gap:6px;min-height:110px}.child-card[aria-pressed=true]{border:2px solid var(--forest)}.child-card strong{font-size:1.2rem}.child-card small{color:var(--muted)}#parent-detail>form{padding:14px 0;border-bottom:1px solid var(--line)}#parent-detail>.download{margin:14px 0}.detail-tabs{margin:24px 0 12px}.artifact-detail{width:100%;border-top:1px solid var(--line);margin-top:15px;padding-top:15px}.artifact-block{border-bottom:1px solid var(--line);padding:10px 0;line-height:1.55}.artifact-block h4{margin:5px 0}.quiz-form fieldset{border:1px solid var(--line);border-radius:12px;padding:12px;margin:12px 0}.quiz-form legend{font-weight:700;padding:0 6px}.choice{display:flex;align-items:center;gap:10px;line-height:1.5;min-height:44px;margin:4px 0}.choice input{width:20px;height:20px;flex:none}.quiz-feedback,.feedback-line{font-weight:650;color:var(--forest)}.toast{position:fixed;bottom:16px;left:16px;right:16px;max-width:600px;margin:auto;background:var(--forest);color:white;padding:14px 18px;border-radius:12px;box-shadow:var(--shadow);z-index:30;display:none}.toast.visible{display:block}@media(min-width:720px){.gate{grid-template-columns:1.15fr .85fr;min-height:calc(100vh - 64px);gap:45px}.form-grid{grid-template-columns:1fr 1fr}.workspace{display:grid;grid-template-columns:235px minmax(0,1fr)}.sidebar{position:sticky;top:64px;height:calc(100vh - 64px);padding:28px 18px}.side-nav{display:grid}.content{padding:34px 30px}.parent{padding:34px 24px}.panel{padding:24px}.item{display:flex;align-items:start;justify-content:space-between;gap:14px;flex-wrap:wrap}.artifact-detail{flex-basis:100%}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}