:root{--bg:#f7f5ef;--surface:#fffdf7;--surface-2:#f0efe8;--ink:#1b1f23;--muted:#667085;--line:#dedbd0;--code:#171923;--code-line:#2d3140;--green:#1f8a70;--blue:#2f6fed;--gold:#b7791f;--red:#c2414b;--shadow:0 18px 50px #28231a14;color:var(--ink);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input,textarea{font:inherit}button{cursor:pointer}.shell{grid-template-columns:280px minmax(0,1fr) 300px;min-height:100vh;display:grid}.sidebar,.inspector{-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#fffdf7c7;height:100vh;position:sticky;top:0;overflow:auto}.sidebar{border-right:1px solid var(--line);padding:22px 16px}.brand{align-items:center;gap:12px;margin-bottom:24px;display:flex}.brand-mark{color:#fff;background:linear-gradient(145deg, var(--green), var(--blue));border-radius:8px;place-items:center;width:42px;height:42px;font-weight:800;display:grid}.brand strong,.brand small{display:block}.brand small,.search span,.lesson-kicker,.module-title{color:var(--muted);font-size:12px}.search{gap:8px;margin-bottom:20px;display:grid}.search input{border:1px solid var(--line);width:100%;color:var(--ink);background:var(--surface);border-radius:8px;outline:none;padding:11px 12px}.search input:focus{border-color:var(--blue);box-shadow:0 0 0 3px #2f6fed24}.module{margin-top:18px}.module-title{margin:0 0 8px 8px;font-weight:700}.lesson-link{width:100%;color:var(--ink);text-align:left;background:0 0;border:0;border-radius:8px;gap:4px;margin:4px 0;padding:10px 12px;display:grid}.lesson-link span{color:var(--muted);font-size:12px}.lesson-link strong{font-weight:600}.lesson-link small{color:var(--gold);font-size:11px;font-weight:800}.lesson-link:hover{background:var(--surface-2)}.lesson-link.active{color:#fff;background:#22262f}.lesson-link.active span{color:#cbd5e1}.lesson-link.favorite:not(.active){background:#fff8e8}.content{padding:42px clamp(24px,5vw,72px)}.lesson{max-width:860px;margin:0 auto}.lesson-kicker{letter-spacing:.04em;text-transform:uppercase;margin-bottom:12px;font-weight:800}.title-row{justify-content:space-between;align-items:flex-start;gap:24px;display:flex}.title-actions{flex:none;gap:8px;display:flex}.complete-button,.favorite-button{border:1px solid var(--line);color:var(--ink);background:var(--surface);border-radius:8px;flex:none;padding:10px 14px;font-weight:700}.favorite-button.done{color:#fff;border-color:var(--gold);background:var(--gold)}.complete-button.done{color:#fff;border-color:var(--green);background:var(--green)}h1,h2,p{margin:0}h1{letter-spacing:0;max-width:760px;font-size:44px;line-height:1.12}h2{font-size:18px}.summary{color:#475467;max-width:760px;margin-top:18px;font-size:18px;line-height:1.75}.panel{border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow);border-radius:8px;margin-top:24px;padding:22px}.section-head{justify-content:space-between;align-items:center;gap:12px;display:flex}.source-label{color:var(--muted);overflow-wrap:anywhere;text-align:right;font-size:12px}.goal-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:16px;display:grid}.goal-grid span{border:1px solid var(--line);background:#fbfaf5;border-radius:8px;min-height:72px;padding:14px;line-height:1.5}pre{color:#f8fafc;background:linear-gradient(90deg, #ffffff0a 1px, transparent 1px) 0 0 / 44px 44px, var(--code);border-radius:8px;margin:16px 0 0;padding:18px;line-height:1.7;overflow:auto}code{font-family:JetBrains Mono,SFMono-Regular,Consolas,monospace;font-size:14px}.markdown-panel{padding:0}.markdown-panel>.section-head{border-bottom:1px solid var(--line);padding:18px 22px}.markdown-body{color:#2f3847;padding:8px 28px 28px;line-height:1.78}.markdown-body h1,.markdown-body h2,.markdown-body h3,.markdown-body h4{max-width:none;color:var(--ink);letter-spacing:0;margin:28px 0 12px}.markdown-body h1{font-size:30px}.markdown-body h2{border-top:1px solid var(--line);padding-top:24px;font-size:24px}.markdown-body h3{font-size:20px}.markdown-body p,.markdown-body ul,.markdown-body ol,.markdown-body blockquote,.markdown-body table{margin:14px 0}.markdown-body ul,.markdown-body ol{padding-left:24px}.markdown-body a{color:var(--blue);text-underline-offset:3px;text-decoration-thickness:1px}.markdown-body img{border:1px solid var(--line);border-radius:8px;max-width:100%}.markdown-body table{border-collapse:collapse;width:100%;display:block;overflow:auto}.markdown-body th,.markdown-body td{border:1px solid var(--line);padding:8px 10px}.markdown-body blockquote{border-left:4px solid var(--green);color:#526070;background:#f4fbf8;margin-left:0;padding:8px 16px}.markdown-body :not(pre)>code{color:#a13a12;background:#f3eadf;border-radius:5px;padding:2px 6px;font-size:.92em}.code-frame{background:var(--code);border:1px solid #2c3442;border-radius:8px;margin:18px 0;overflow:hidden}.code-frame pre{border-radius:0;margin:0}.code-toolbar{color:#b8c4d6;background:#111722;border-bottom:1px solid #2c3442;justify-content:space-between;align-items:center;padding:8px 10px 8px 14px;font-size:12px;display:flex}.code-toolbar .ghost-button{color:#e5eefc;background:#1d2634;border-color:#3f4a5c;padding:5px 9px;font-size:12px}.ghost-button{border:1px solid var(--line);color:var(--ink);background:var(--surface);border-radius:8px;padding:8px 12px}.ghost-button:hover{border-color:var(--blue);color:var(--blue)}.lab-panel{gap:16px;display:grid}.lab-actions{flex-wrap:wrap;gap:8px;display:flex}.run-button{border:1px solid var(--blue);color:#fff;background:var(--blue);border-radius:8px;padding:8px 14px;font-weight:800}.run-button:disabled,.ghost-button:disabled{cursor:progress;opacity:.7}.lab-status{color:#475467;background:#fbfaf5;border:1px solid #d9d6cc;border-radius:8px;padding:10px 12px;font-size:13px;line-height:1.55}.lab-status.busy{color:#1d4ed8;background:#eef5ff;border-color:#b7cffc}.lab-status.ready{color:#0f766e;background:#eefaf5;border-color:#bfe4d6}.lab-status.error{color:#b4232f;background:#fff1f2;border-color:#f0b8bd}.lab-field{gap:8px;display:grid}.lab-field span{color:var(--muted);font-size:12px;font-weight:800}.lab-field textarea,.note-editor{border:1px solid var(--line);width:100%;color:var(--ink);resize:vertical;background:#fffefa;border-radius:8px;outline:none;padding:12px}.lab-field textarea:focus,.note-editor:focus{border-color:var(--blue);box-shadow:0 0 0 3px #2f6fed24}.lab-field [data-lab-code]{min-height:220px;font-family:JetBrains Mono,SFMono-Regular,Consolas,monospace;font-size:14px;line-height:1.65}.lab-field [data-lab-input]{min-height:84px;font-family:JetBrains Mono,SFMono-Regular,Consolas,monospace;font-size:13px}.stdin-panel{background:#fffefa;border:1px dashed #d7d1c4;border-radius:8px;padding:0}.stdin-panel summary{cursor:pointer;color:#384152;padding:11px 12px;font-size:13px;font-weight:800}.stdin-panel p{color:var(--muted);margin:0;padding:0 12px 10px;font-size:13px;line-height:1.6}.stdin-panel textarea{border:1px solid var(--line);width:calc(100% - 24px);min-height:76px;color:var(--ink);resize:vertical;background:#fff;border-radius:8px;outline:none;margin:0 12px 12px;padding:12px;font-family:JetBrains Mono,SFMono-Regular,Consolas,monospace;font-size:13px;display:block}.stdin-panel textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px #2f6fed24}.lab-output{color:#d7e2f2;white-space:pre-wrap;background:#111722;border:1px solid #2c3442;border-radius:8px;min-height:110px;padding:14px;font-family:JetBrains Mono,SFMono-Regular,Consolas,monospace;font-size:13px;line-height:1.65;overflow:auto}.task-list{color:#344054;margin:14px 0 0;padding-left:22px;line-height:1.8}.task-panel{margin-bottom:36px}.inspector{border-left:1px solid var(--line);padding:22px 16px}.status-card{border:1px solid var(--line);background:var(--surface);border-radius:8px;margin-bottom:14px;padding:18px}.status-card p,.status-card li{color:#475467;line-height:1.7}.status-card h2{margin-bottom:10px}.status-card ul{margin:0;padding-left:18px}.note-editor{min-height:160px;line-height:1.65}.outline-list{max-height:280px;overflow:auto}.status-ring{border:8px solid #d7efe8;border-top-color:var(--green);width:86px;height:86px;color:var(--green);border-radius:50%;place-items:center;margin-bottom:16px;font-weight:800;display:grid}@media (width<=1080px){.shell{grid-template-columns:240px minmax(0,1fr)}.inspector{border-top:1px solid var(--line);border-left:0;grid-column:1/-1;grid-template-columns:repeat(2,minmax(0,1fr));height:auto;display:grid;position:static}}@media (width<=760px){.shell{display:block}.sidebar{border-right:0;border-bottom:1px solid var(--line);height:auto;position:static}.inspector{display:block}.content{padding:28px 16px}h1{font-size:32px}.summary{font-size:16px}.title-row{display:grid}.title-actions{flex-wrap:wrap}.goal-grid{grid-template-columns:1fr}.markdown-body{padding:4px 18px 22px}}.auth-shell{background:var(--bg);place-items:center;min-height:100vh;padding:24px;display:grid}.auth-panel{border:1px solid var(--line);background:var(--surface);width:min(100%,440px);box-shadow:var(--shadow);border-radius:8px;padding:32px}.auth-brand{margin-bottom:34px}.auth-panel h1{margin:0 0 8px;font-size:28px}.auth-subtitle{color:var(--muted);margin:0 0 24px;line-height:1.6}.disabled-account-panel h1{margin:18px 0 8px}.disabled-account-panel a{color:var(--blue)}.auth-form,.settings-form{gap:14px;display:grid}.auth-form label,.settings-form label{color:var(--muted);gap:7px;font-size:13px;font-weight:700;display:grid}.auth-form input,.settings-form input,.settings-form select{border:1px solid var(--line);width:100%;color:var(--ink);background:var(--surface);border-radius:8px;outline:none;padding:10px 12px}.auth-form input:focus,.settings-form input:focus,.settings-form select:focus{border-color:var(--blue);box-shadow:0 0 0 3px #2f6fed24}.auth-message,.settings-message{min-height:20px;color:var(--green);margin:14px 0 0;font-size:13px}.auth-message.error,.settings-message.error{color:var(--red)}.text-button{color:var(--blue);background:0 0;border:0;padding:0;font-size:13px}.account-heading{justify-content:space-between;align-items:center;gap:12px;display:flex}.account-heading strong,.eyebrow{display:block}.eyebrow{color:var(--muted);margin-bottom:4px;font-size:11px}.role-badge{border:1px solid var(--line);color:var(--muted);border-radius:999px;align-items:center;padding:4px 8px;font-size:11px;font-weight:700;display:inline-flex}.admin-settings-card{border-color:#2f6fed59}.admin-settings-card h3{margin:20px 0 12px;font-size:15px}.admin-divider{background:var(--line);height:1px;margin:20px 0}.profile-toolbar{grid-template-columns:minmax(0,1fr) auto auto;align-items:end;gap:8px;margin:14px 0;display:grid}.profile-toolbar label{color:var(--muted);gap:7px;font-size:13px;font-weight:700;display:grid}.profile-toolbar select{border:1px solid var(--line);min-width:0;color:var(--ink);background:var(--surface);border-radius:8px;padding:9px 10px}.profile-toolbar .danger-button:disabled{cursor:not-allowed;opacity:.45}.panel-subtitle{color:var(--muted);margin:4px 0 0;font-size:13px}.quiz-controls{flex-wrap:wrap;align-items:end;gap:10px;display:flex}.quiz-controls label{color:var(--muted);gap:5px;font-size:12px;font-weight:700;display:grid}.quiz-controls select{border:1px solid var(--line);min-width:132px;color:var(--ink);background:var(--surface);border-radius:8px;padding:9px 10px}.quiz-question,.evaluation,.chat-messages{border:1px solid var(--line);background:var(--surface-2);border-radius:8px;margin-top:18px;padding:16px}.quiz-question p,.evaluation p,.chat-message p{white-space:pre-wrap;margin:8px 0;line-height:1.65}.quiz-question details{color:var(--muted);margin-top:12px}.ai-answer-field{color:var(--muted);gap:8px;margin-top:16px;font-size:13px;font-weight:700;display:grid}.chat-form textarea{resize:vertical;border:1px solid var(--line);width:100%;min-height:120px;color:var(--ink);background:var(--surface);border-radius:8px;outline:none;padding:12px}.chat-form textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px #2f6fed24}.ai-answer-field+.ghost-button{margin-top:12px}.answer-editor{border:1px solid var(--line);background:var(--surface);border-radius:8px;grid-template-columns:48px minmax(0,1fr);min-height:224px;display:grid;overflow:hidden}.answer-editor:focus-within{border-color:var(--blue);box-shadow:0 0 0 3px #2f6fed24}.answer-line-numbers{min-width:0;color:var(--muted);background:var(--surface-2);border-right:1px solid var(--line);text-align:right;-webkit-user-select:none;user-select:none;margin:0;padding:12px 10px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:24px;list-style:none;overflow:hidden}.answer-line-numbers li{height:24px}.ai-answer-field .answer-editor textarea{resize:vertical;width:100%;min-height:224px;color:var(--ink);background:0 0;border:0;border-radius:0;outline:none;padding:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;line-height:24px}.evaluation-head{justify-content:space-between;align-items:center;gap:12px;display:flex}.evaluation.correct{border-color:#1f8a7080}.evaluation.partial,.evaluation.needs_review{border-color:#b7791f80}.evaluation.incorrect{border-color:#c2414b80}.evaluation h3{margin:18px 0 8px;font-size:14px}.evaluation ul{margin:0;padding-left:18px}.standard-answer{border-top:1px solid var(--line);margin-top:18px}.ai-disclaimer{border-top:1px solid var(--line);color:var(--muted);margin:18px 0 0;padding-top:12px;font-size:12px}.chat-message .ai-disclaimer{margin-top:12px}.chat-messages{gap:10px;max-height:360px;display:grid;overflow:auto}.chat-message{background:var(--surface);border-radius:8px;padding:10px 12px}.chat-message.user{border-left:3px solid var(--blue)}.chat-message.assistant{border-left:3px solid var(--green)}.chat-message span{color:var(--muted);font-size:11px;font-weight:800}.chat-form{gap:12px;margin-top:14px;display:grid}.ai-message{color:var(--red);margin:14px 0 0;font-size:13px}.empty-state{color:var(--muted);margin:16px 0 0}.admin-entry-card p{color:var(--muted);margin:8px 0 16px;font-size:13px;line-height:1.55}.settings-source-label{color:var(--muted);gap:7px;margin:14px 0;font-size:13px;font-weight:700;display:grid}.settings-source-label select{border:1px solid var(--line);width:100%;color:var(--ink);background:var(--surface);border-radius:8px;padding:10px 12px}.admin-shell{width:min(1440px,100% - 48px);margin:0 auto;padding:28px 0 48px}.admin-topbar{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;padding-bottom:22px;display:flex}.admin-topbar-actions{flex-wrap:wrap;gap:10px;display:flex}.admin-page-heading{padding:30px 0 24px}.admin-page-heading h1{margin:4px 0 8px;font-size:28px}.admin-page-heading p{color:var(--muted);margin:0}.admin-content-grid{grid-template-columns:minmax(280px,360px) minmax(0,1fr);align-items:start;gap:24px;display:grid}.admin-users-section{min-width:0}.users-table-wrap{border:1px solid var(--line);background:var(--surface);border-radius:8px;overflow-x:auto}.users-table{border-collapse:collapse;width:100%;min-width:1000px;font-size:13px}.users-table th,.users-table td{border-bottom:1px solid var(--line);text-align:left;vertical-align:top;padding:13px 12px}.users-table th{color:var(--muted);background:var(--surface-2);font-size:12px}.users-table td small{color:var(--muted);margin-top:4px;line-height:1.45;display:block}.users-table tbody tr:last-child td{border-bottom:0}.status-pill{border-radius:999px;padding:4px 8px;font-size:12px;font-weight:700;display:inline-flex}.status-pill.active{color:var(--green);background:#1f8a701c}.status-pill.inactive{color:var(--red);background:#c2414b1c}.permission-toggle{white-space:nowrap;align-items:center;gap:7px;margin:0 0 7px;display:flex}.permission-toggle input{accent-color:var(--blue)}.user-actions{gap:8px;min-width:190px;display:grid}.user-actions form{grid-template-columns:minmax(0,1fr) auto;gap:8px;display:grid}.user-actions input{border:1px solid var(--line);min-width:0;color:var(--ink);background:var(--surface);border-radius:6px;padding:8px}.danger-button{width:fit-content;color:var(--red);background:0 0;border:1px solid #c2414b73;border-radius:6px;padding:8px 10px;font-weight:700}.empty-cell{color:var(--muted);text-align:center}@media (width<=900px){.admin-shell{width:min(100% - 28px,1440px);padding-top:18px}.admin-content-grid{grid-template-columns:1fr}}@media (width<=600px){.admin-topbar{flex-direction:column;align-items:flex-start}.admin-page-heading h1{font-size:24px}.profile-toolbar{grid-template-columns:1fr 1fr}.profile-toolbar label{grid-column:1/-1}}