:root{--bg:#f5f6f8;--ink:#19252a;--muted:#728087;--accent:#087f6e;--line:#e3e8e9;--dark:#152e32}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:14px;line-height:1.6}button,input,textarea,select{font:inherit}button,a,select{cursor:pointer}button{border:1px solid var(--line);border-radius:8px;padding:10px 16px;background:white;color:var(--ink);font-weight:600;transition:background .15s}button:hover{background:#ecf5f2}button:disabled{opacity:.45;cursor:default}button.primary{background:var(--accent);color:white;border-color:var(--accent)}button.primary:hover{background:#076c5e}button.primary span{margin-left:24px}.muted,small{color:var(--muted)}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;color:var(--muted);margin:0 0 14px}.layout{display:grid;grid-template-columns:236px 1fr;min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:white;border-right:1px solid var(--line);padding:30px 21px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-weight:750;font-size:18px;margin-bottom:52px}.brand-mark{background:var(--accent);color:white;width:54px;height:54px;border-radius:13px;display:inline-flex;align-items:center;justify-content:center;font-family:monospace;font-size:25px;font-weight:bold}.brand-mark.small{width:35px;height:35px;font-size:18px;border-radius:9px}.nav{border:0;background:none;text-align:left;width:100%;margin:3px 0;padding:12px;font-size:13px;color:var(--muted)}.nav.active{background:#e8f4ef;color:var(--accent)}#module-nav{border-top:1px solid var(--line);margin-top:22px;padding-top:18px}#module-nav button{display:block;border:0;background:none;font-size:12px;color:var(--muted);padding:9px 6px;text-align:left}.side-bottom{margin-top:auto}.tutor-badge{display:flex;gap:10px;align-items:center;background:#f7f9f8;padding:12px;border-radius:8px;font-size:12px}.tutor-badge small{display:block;font-size:10px}.status-dot{display:inline-block;width:7px;height:7px;background:#42b98c;border-radius:50%;flex-shrink:0}.text-button{border:0;background:transparent;font-size:12px;color:var(--muted)}.main{padding:0 44px;min-width:0;max-width:1700px;width:100%;margin:auto}header{height:100px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);margin-bottom:30px}header .eyebrow{margin-bottom:3px;font-size:9px}header span{font-size:12px;color:var(--muted)}.avatar{border:1px solid #d1dfd9;background:#e9f0eb;border-radius:50%;padding:9px;font-size:10px;font-weight:700}.hero{border-radius:16px;background:#e7efeb;display:grid;grid-template-columns:1fr 1fr;padding:36px 38px;gap:20px;overflow:hidden}.pill{display:inline-block;font-size:9px;letter-spacing:1px;font-weight:700;border:1px solid #b7cfc3;padding:4px 10px;border-radius:40px;color:#4c7564}h1{font-size:38px;line-height:1.2;letter-spacing:-1.5px;font-weight:650;margin:22px 0 16px}h1 em{font-style:normal;color:var(--accent)}.hero p{color:#657b71;margin-bottom:25px;font-size:13px}.code-art{background:var(--dark);color:#d9e5e1;border-radius:10px;box-shadow:0 12px 24px #16312c22;align-self:center;transform:rotate(-1deg);overflow:hidden;font-size:11px}.window-dots{padding:12px 16px;border-bottom:1px solid #ffffff16;color:#6b8783;letter-spacing:3px;font-size:9px}.window-dots span{margin-left:14px;letter-spacing:0;color:#91a9a3}.code-art pre{padding:16px 21px;font-size:11px;line-height:2.1}.code-art pre span{color:#9ab7f5}.code-art pre i{font-style:normal;color:#90d4a6}.code-art pre b{color:#e6cc92;font-weight:normal}.art-footer{padding:12px 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.eyebrow{margin-bottom:3px}.section-heading>span{font-size:11px}.modules{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.module-card{border:1px solid var(--line);border-radius:11px;background:white;padding:23px;text-align:left;width:100%;position:relative;font-weight:400}.module-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.module-icon{width:40px;height:40px;border-radius:10px;background:#edf4f1;color:var(--accent);font-size:18px;display:flex;align-items:center;justify-content:center}.module-top small{font-size:9px;letter-spacing:1px}.module-card h3{font-size:16px;margin:0 0 8px;font-weight:650}.module-card p{color:var(--muted);font-size:11px;min-height:38px;font-weight:400}.module-bottom{border-top:1px solid var(--line);padding-top:14px;display:flex;justify-content:space-between;font-size:10px;color:var(--muted)}.module-bottom b{color:var(--accent);font-weight:600}.lower-grid{display:grid;grid-template-columns:1fr 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small{font-size:10px}#messages{padding:16px;height:430px;overflow:auto}.message{white-space:pre-wrap;overflow-wrap:anywhere;padding:13px;margin:8px 0;border-radius:8px;background:#f1f5f3;font-size:12px}.message.user{background:#e7eff7;margin-left:24px}.message b{display:block;margin-bottom:6px;font-size:10px;letter-spacing:.7px;color:var(--accent)}#chat-form{padding:14px;border-top:1px solid var(--line)}#chat-form textarea{width:100%;resize:vertical;font-size:12px}#chat-form button{margin-top:8px;width:100%;font-size:12px}footer{display:flex;justify-content:space-between;color:var(--muted);font-size:10px;padding:32px 0;margin-top:20px}footer span{font-size:10px}.login{max-width:470px;margin:8vh auto;padding:28px}.login>.eyebrow{margin-top:28px}.login h1{font-size:38px}.login h1 span{color:var(--accent)}.login form{margin:30px 0}.login label{display:block;font-size:12px;font-weight:600;margin:16px 0}.login input{display:block;width:100%;margin-top:5px;padding:12px}.login button{width:100%;margin-top:12px}.error{color:#a03939}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}[hidden]{display:none!important}
@media(min-width:1500px){.hero{padding:45px}.hero h1{font-size:48px}.code-art pre{font-size:13px}}@media(max-width:1100px){.layout{grid-template-columns:190px 1fr}.sidebar{padding:24px 14px}.main{padding:0 24px}.brand{font-size:15px}.hero{padding:26px}.hero h1{font-size:31px}.code-art{font-size:9px}.code-art pre{font-size:9px;padding:10px}.modules{grid-template-columns:repeat(2,1fr)}.stats{grid-template-columns:repeat(2,1fr)}.work-grid{grid-template-columns:1fr}.chat-panel #messages{height:320px}}@media(max-width:700px){.layout{display:block}.sidebar{position:static;height:auto;padding:14px 20px;display:block;border-bottom:1px solid var(--line)}.brand{margin:0 0 10px}.sidebar>.eyebrow,#module-nav,.side-bottom .tutor-badge{display:none}.sidebar nav{display:flex}.nav{width:auto}.side-bottom{position:absolute;right:15px;top:18px}.main{padding:0 18px}header{height:70px;margin-bottom:20px}.hero{grid-template-columns:1fr;padding:25px}.hero h1{font-size:34px}.code-art{display:none}.stats{gap:10px;margin-bottom:25px}.stats article{padding:15px}.stats small{font-size:8px}.stats strong{font-size:28px}.stats strong.level{font-size:18px}.modules{grid-template-columns:1fr}.section-heading{align-items:flex-start}.section-heading>span{max-width:95px;text-align:right}.lower-grid{grid-template-columns:1fr}.task-toolbar{flex-wrap:wrap}.task-toolbar select{flex-basis:100%}.workspace-heading h1{font-size:22px}.workspace-heading .pill{font-size:8px}footer span{display:none}.editor-toolbar .text-button{font-size:10px;padding:6px}.editor-toolbar .muted{display:none}}

.collection-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.collection-tabs button.active{background:var(--accent);color:white;border-color:var(--accent)}.collection-toolbar{display:flex;gap:12px;margin:20px 0}.collection-toolbar input{flex:1;min-width:0}.collection-grid{display:grid;grid-template-columns:minmax(220px,.65fr) minmax(0,1.5fr);gap:20px;align-items:start}.collection-list-panel{padding:12px;max-height:900px;overflow:auto}.collection-card{display:block;width:100%;text-align:left;padding:15px;border:0;border-bottom:1px solid var(--line);border-radius:5px;font-weight:400;overflow-wrap:anywhere}.collection-card.selected{background:#e8f4ef}.collection-card strong{display:block;font-size:13px}.collection-card p{font-size:11px;color:var(--muted);margin:5px 0;white-space:pre-wrap}.collection-card small{display:block;font-size:10px}.session-card{padding:12px 5px;border-bottom:1px solid var(--line)}.session-card strong{display:block;font-size:12px}.session-card p{font-size:10px;color:var(--muted)}.session-card button{font-size:10px;padding:6px;margin-right:5px}.collection-meta{display:grid;grid-template-columns:2fr 1fr 1fr;gap:10px}.collection-meta label,.personal-label,.personal-versions label{font-size:11px;color:var(--muted);display:block}.collection-meta input,.collection-meta select{display:block;width:100%;min-width:0;margin-top:5px}.personal-label{margin-top:18px}.personal-label textarea{display:block;width:100%;margin-top:5px;resize:vertical}.personal-save-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:12px 0}.personal-save-row span{font-size:10px;margin-right:auto}.personal-save-row button{font-size:11px}.personal-versions{display:flex;gap:10px;align-items:end;margin-top:20px;border-top:1px solid var(--line);padding-top:18px}.personal-versions select{display:block;max-width:280px;font-size:11px}.personal-versions button{font-size:11px}#personal-editor{height:380px;display:none}#personal-fallback{height:380px;width:100%;background:#18292d;color:#d3e5da;font-family:monospace;resize:vertical;padding:15px}#personal-code{border:1px solid var(--line);border-radius:8px;overflow:hidden}#personal-code .editor-toolbar{flex-wrap:wrap}#personal-code button{font-size:10px}.personal-tutor{border-top:1px solid var(--line);margin-top:22px;padding-top:20px}#personal-messages{max-height:280px;overflow:auto}#personal-chat textarea{width:100%;resize:vertical}#personal-chat button{margin-top:8px;font-size:12px}.collection-grid>#collection-empty{grid-column:2}.collection-grid>#collection-detail{min-width:0}#collection-more{margin-top:15px;width:100%}@media(max-width:1100px){.collection-grid{grid-template-columns:1fr}.collection-list-panel{max-height:300px}.collection-grid>#collection-empty{grid-column:auto}.collection-meta{grid-template-columns:1fr 1fr}.collection-meta label:first-child{grid-column:1/-1}}@media(max-width:700px){.sidebar nav{flex-wrap:wrap}.collection-tabs button{font-size:11px;padding:8px}.collection-toolbar{flex-wrap:wrap}.collection-toolbar input{flex-basis:100%}.personal-versions{align-items:stretch;flex-direction:column}.personal-versions select{max-width:100%;width:100%}.collection-meta{grid-template-columns:1fr}.collection-grid>#collection-detail{padding:14px}.collection-meta label:first-child{grid-column:auto}.personal-save-row{align-items:flex-start}.personal-save-row span{width:100%}}