:root{--ink:#1a1a1a;--canvas:#ffffff;--surface:#f5f4f1;--surface2:#eeece8;--border:#e8e6e0;--muted:#6b6b65;--light:#a0a09a;--green:#1a8a5a;--green-bg:#e8f7f0;--green-mid:#0F6E56;--orange:#d45a1f;--orange-bg:#fdf0e8;--orange-mid:#854F0B;--red:#c53030;--violet:#534AB7;--blue:#185FA5;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:32px;--display:"Syne",sans-serif;--sans:"DM Sans",system-ui,-apple-system,sans-serif;--mono:"Courier New",ui-monospace,monospace;--gap:16px}.portal-root *,.portal-root :after,.portal-root :before{box-sizing:border-box;margin:0;padding:0}.portal-root .sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}.portal-root{height:100vh;font-family:var(--sans);font-size:15px;line-height:1.6;color:var(--ink);background:var(--canvas);-webkit-font-smoothing:antialiased}.portal-root h1,.portal-root h2,.portal-root h3,.portal-root h4{font-family:var(--display);font-weight:700;letter-spacing:-.015em;line-height:1.1}.portal-root .display{font-family:var(--display);font-weight:800;letter-spacing:-.02em}.portal-root p{line-height:1.6}.portal-root a{color:var(--ink);text-decoration:none}.portal-root .muted{color:var(--muted)}.portal-root .light{color:var(--light)}.portal-root .mono{font-family:var(--mono)}.portal-root .green-text{color:var(--green-mid)}.portal-root .orange-text{color:var(--orange-mid)}.portal-root .label{letter-spacing:.1em}.portal-root .label,.portal-root .section-label{font-size:10px;font-weight:500;text-transform:uppercase;color:var(--light)}.portal-root .section-label{letter-spacing:.12em;margin-bottom:4px}.portal-root .col,.portal-root .row{display:flex;gap:var(--gap)}.portal-root .col{flex-direction:column}.portal-root .wrap{flex-wrap:wrap}.portal-root .grow{flex:1}.portal-root .center{align-items:center}.portal-root .between{justify-content:space-between}.portal-root .gap-sm{gap:8px}.portal-root .gap-xs{gap:4px}.portal-root .grid{display:grid;gap:var(--gap)}.portal-root .g2{grid-template-columns:1fr 1fr}.portal-root .g3{grid-template-columns:repeat(3,1fr)}.portal-root .g4{grid-template-columns:repeat(4,1fr)}.portal-root .g-split{grid-template-columns:1.55fr 1fr;align-items:start}.portal-root .app{display:grid;grid-template-columns:248px 1fr;height:100vh;overflow:hidden}.portal-root .sidebar{background:var(--surface);border-right:1px solid var(--border);padding:22px 16px 18px;display:flex;flex-direction:column;gap:2px;overflow-y:auto}.portal-root .brand{padding:0 8px 6px}.portal-root .brand .logo{font-family:var(--display);font-weight:800;font-size:15px;letter-spacing:-.02em;line-height:1.15}.portal-root .brand .ver{font-size:9px;letter-spacing:.08em;text-transform:uppercase;color:var(--light);margin-top:5px}.portal-root .brand-link{display:block;text-decoration:none;color:inherit}.portal-root .brand-lockup{display:flex;flex-direction:column;align-items:flex-start;gap:8px}.portal-root .brand-mark{width:40px;height:40px;-o-object-fit:contain;object-fit:contain;flex-shrink:0}.portal-root .brand-mark-ink{position:relative;display:inline-block}.portal-root .brand-mark-ink img{position:absolute;inset:0;width:100%;height:100%;-o-object-fit:contain;object-fit:contain}.portal-root .brand-mark-ink img:first-child{filter:brightness(0) invert(1)}.portal-root .nav-group{font-size:9px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--light);margin:18px 8px 6px}.portal-root .nav-group-toggle{display:flex;align-items:center;gap:6px;padding:0;border:none;background:none;font-family:var(--sans);text-align:left;cursor:pointer;transition:color .12s}.portal-root .nav-group-toggle:hover{color:var(--muted)}.portal-root .nav-group-toggle:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:4px}.portal-root .nav-group-toggle .nav-ico{width:11px;height:11px;flex:0 0 auto;transition:transform .15s ease}.portal-root .nav-group-toggle[aria-expanded=false] .nav-ico{transform:rotate(-90deg)}.portal-root .nav-group-count{font-size:9px;font-weight:600;color:var(--light)}.portal-root .nav-item{display:flex;align-items:center;gap:10px;width:100%;text-align:left;font-family:var(--sans);font-size:13px;color:var(--muted);cursor:pointer;padding:8px 10px;background:none;border:none;border-left:2px solid transparent;margin-left:0;border-radius:0 var(--radius-sm) var(--radius-sm) 0;transition:color .12s,background .12s,border-color .12s}.portal-root .nav-item.active,.portal-root .nav-item:hover{color:var(--ink);background:var(--surface2)}.portal-root .nav-item.active{font-weight:500;border-left-color:var(--ink)}.portal-root .nav-item .nav-ico{width:16px;height:16px;flex:0 0 auto;opacity:.9}.portal-root .nav-num{font-size:9px;color:var(--light);font-weight:600;width:14px}.portal-root .nav-spacer{flex:1;min-height:12px}.portal-root .streak-pill{display:flex;align-items:center;gap:10px;background:var(--canvas);border:1px solid var(--border);border-radius:var(--radius-md);padding:9px 12px;margin:4px 0}.portal-root .streak-pill .fire{font-size:16px}.portal-root .streak-pill b{font-family:var(--display);font-weight:700;font-size:16px}.portal-root .side-user{display:flex;align-items:center;gap:9px;padding:8px 10px}.portal-root .main{min-width:0;overflow-y:auto;background:var(--canvas);position:relative}.portal-root .topbar{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:14px;padding:12px 28px;background:color-mix(in srgb,var(--canvas) 88%,transparent);backdrop-filter:blur(6px);border-bottom:1px solid var(--border)}.portal-root .crumb{font-size:12px;color:var(--light)}.portal-root .crumb b{color:var(--ink);font-weight:500}.portal-root .nav-scrim,.portal-root .nav-toggle,.portal-root .topbar.topbar-nav-only{display:none}.portal-root .avatar{width:30px;height:30px;border-radius:50%;background:var(--surface2);border:1px solid var(--border);display:grid;place-items:center;font-size:11px;font-weight:600;flex:0 0 auto}.portal-root .avatar.sm{width:26px;height:26px;font-size:10px}.portal-root .pc-timer{display:inline-flex;align-items:center;gap:7px;font-size:11px;font-weight:500;padding:4px 10px;border-radius:20px;background:var(--surface);color:var(--muted);white-space:nowrap;flex:0 0 auto}.portal-root .pc-timer .pc-ico{font-size:12px;line-height:1}.portal-root .pc-timer .pc-num{font-variant-numeric:tabular-nums}.portal-root .pc-timer .pc-unit{color:var(--light)}.portal-root .pc-timer .pc-track{width:44px;height:4px;flex:0 0 auto;background:var(--border)}.portal-root .pc-timer .pc-track>span{transition:width .4s ease}.portal-root .pc-timer.done{background:var(--green-bg);color:var(--green-mid)}.portal-root .pc-timer.done .pc-unit{color:inherit}.portal-root .pc-timer .pc-check{font-weight:700;line-height:1}@media (prefers-reduced-motion:reduce){.portal-root .pc-timer .pc-track>span{transition:none}}.portal-root .screen{padding:30px 36px 72px;max-width:1140px;margin:0 auto}.portal-root .screen-head{margin-bottom:22px}.portal-root .screen-head h1{font-size:26px}.portal-root .screen-head .lead{color:var(--muted);margin-top:6px;font-size:14px;max-width:640px}.portal-root .seg{display:inline-flex;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;background:var(--canvas)}.portal-root .seg button{font-family:var(--sans);font-size:13px;font-weight:500;padding:7px 16px;border:none;background:none;cursor:pointer;color:var(--muted);white-space:nowrap}.portal-root .seg button+button{border-left:1px solid var(--border)}.portal-root .seg button.on{background:var(--ink);color:#fff}.portal-root .files-tabs{display:flex;gap:28px;border-bottom:1px solid var(--border);margin-bottom:8px}.portal-root .files-tabs button{font-family:var(--sans);font-size:18px;font-weight:600;background:none;cursor:pointer;color:var(--light);padding:6px 0 14px;border:none;border-bottom:2px solid transparent;margin-bottom:-1px;display:inline-flex;align-items:baseline;gap:6px}.portal-root .files-tabs button:hover{color:var(--muted)}.portal-root .files-tabs button .count{font-size:12px;font-weight:500;color:var(--light)}.portal-root .files-tabs button.on{color:var(--ink);border-bottom-color:var(--ink)}.portal-root .files-tabs button.on .count{color:var(--muted)}.portal-root .class-tabs{display:flex;gap:18px;margin-bottom:8px;overflow-x:auto;scrollbar-width:thin;box-shadow:inset 0 -1px 0 var(--border)}.portal-root .class-tabs a{flex:0 0 auto;white-space:nowrap;font-family:var(--sans);font-size:14px;font-weight:600;color:var(--light);padding:6px 0 12px;border-bottom:2px solid transparent;display:inline-flex;align-items:baseline;gap:6px}.portal-root .class-tabs a:hover{color:var(--muted)}.portal-root .class-tabs a .count{font-size:11.5px;font-weight:500;color:var(--light)}.portal-root .class-tabs a[aria-current=page]{color:var(--ink);border-bottom-color:var(--ink)}.portal-root .class-tabs a[aria-current=page] .count{color:var(--muted)}.portal-root .class-tabs a.axis-alt{border-left:1px solid var(--border);padding-left:18px}.portal-root .lab-tabs{display:flex;gap:18px;margin-bottom:8px;overflow-x:auto;scrollbar-width:thin;box-shadow:inset 0 -1px 0 var(--border)}.portal-root .lab-tabs button{flex:0 0 auto;white-space:nowrap;font-family:var(--sans);font-size:14px;font-weight:600;background:none;cursor:pointer;color:var(--light);padding:6px 0 12px;border:none;border-bottom:2px solid transparent;display:inline-flex;align-items:baseline;gap:6px}.portal-root .lab-tabs button:hover{color:var(--muted)}.portal-root .lab-tabs button .count{font-size:11.5px;font-weight:500;color:var(--light)}.portal-root .lab-tabs button.on{color:var(--ink);border-bottom-color:var(--ink)}.portal-root .lab-tabs button.on .count{color:var(--muted)}.portal-root .mind-map{display:flex;flex-direction:column;gap:12px;min-width:0}.portal-root .mind-map-scroll{overflow-x:auto;overflow-y:hidden;padding:14px 14px 10px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);scrollbar-width:thin;scrollbar-color:var(--light) transparent;overscroll-behavior-inline:contain;-webkit-overflow-scrolling:touch}.portal-root .mind-map-stage{position:relative}.portal-root .mind-map-connectors{position:absolute;inset:0;overflow:visible;pointer-events:none}.portal-root .mind-map-edge{stroke:color-mix(in srgb,var(--muted) 48%,var(--border));stroke-width:1.75;vector-effect:non-scaling-stroke}.portal-root .mind-map-node{box-sizing:border-box;padding:7px 11px;font-family:var(--sans);font-size:12.25px;line-height:1.3;color:var(--ink);background:var(--canvas);border:1px solid color-mix(in srgb,var(--light) 55%,var(--border));border-radius:var(--radius-sm);overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;-webkit-box-pack:center}.portal-root .mind-map-node.root{background:var(--green-bg);border-color:color-mix(in srgb,var(--green-mid) 62%,var(--border));color:var(--green-mid);font-weight:600}.portal-root .mind-map-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:0 2px;color:var(--muted);font-size:11.5px;line-height:1.4}.portal-root .mind-map-truncated{color:var(--orange-mid)}.portal-root .mind-map-section-label{margin-bottom:5px}.portal-root .mind-map-chips{gap:6px}.portal-root .card{background:var(--canvas);border:1px solid var(--border);border-radius:var(--radius-md);padding:18px}.portal-root .card.pad-lg{padding:22px}.portal-root .surface{background:var(--surface);border-radius:var(--radius-md);padding:18px}.portal-root .card-h{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;gap:12px}.portal-root .card-h h3{font-size:15px}.portal-root .card-h .label{margin:0}.portal-root .rule{height:1px;background:var(--border);border:none;margin:0}.portal-root .btn{display:inline-flex;align-items:center;gap:6px;font-family:var(--sans);font-size:13px;font-weight:500;padding:8px 16px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--canvas);color:var(--ink);cursor:pointer;transition:background .12s,border-color .12s;text-decoration:none;white-space:nowrap}.portal-root .btn:hover{background:var(--surface2)}.portal-root .btn.primary{background:var(--ink);color:#fff;border-color:var(--ink)}.portal-root .btn.primary:hover{background:#333}.portal-root .btn.green{background:var(--green);color:#fff;border-color:var(--green)}.portal-root .btn.green:hover{background:var(--green-mid)}.portal-root .btn.ghost{border-style:dashed}.portal-root .btn.sm{font-size:12px;padding:6px 12px}.portal-root .btn.lg{font-size:14px;padding:11px 22px}.portal-root .disclosure-btn{list-style:none;align-self:start}.portal-root .disclosure-btn::-webkit-details-marker{display:none}.portal-root .disclosure-btn:after{content:"";width:7px;height:7px;margin-left:2px;margin-top:-3px;border-right:2px solid;border-bottom:2px solid;transform:rotate(45deg);transition:transform .12s ease}.portal-root details[open]>.disclosure-btn:after{transform:rotate(225deg);margin-top:2px}.portal-root .disclosure-btn:focus-visible{outline:2px solid var(--ink);outline-offset:2px}.portal-root dialog.media-modal{position:fixed;inset:0;margin:auto;height:-moz-fit-content;height:fit-content;border:1px solid var(--border);border-radius:var(--radius-md);padding:0;background:var(--canvas);color:var(--ink);width:min(1100px,92vw);max-width:92vw;max-height:92vh;overflow:hidden}.portal-root dialog.media-modal::backdrop{background:rgba(26,26,26,.72)}.portal-root .media-modal-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;border-bottom:1px solid var(--border)}.portal-root .media-modal-title{font-family:var(--display);font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.portal-root .media-modal-close{flex:0 0 auto;font-family:var(--sans);font-size:14px;line-height:1;padding:6px 10px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--canvas);color:var(--muted);cursor:pointer;transition:background .12s,color .12s}.portal-root .media-modal-close:hover{background:var(--surface2);color:var(--ink)}.portal-root .media-modal-body{background:#000}.portal-root .media-modal-body video{display:block;width:100%;max-height:78vh;background:#000}.portal-root .media-modal-msg{display:flex;align-items:center;justify-content:center;gap:8px;min-height:180px;margin:0;font-size:13px;color:var(--light);background:var(--surface)}.portal-root .file-preview-pdf{display:block;width:100%;height:min(80vh,900px);border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface)}.portal-root .file-preview-image{display:block;max-width:100%;max-height:70vh;margin:0 auto;-o-object-fit:contain;object-fit:contain;border-radius:var(--radius-sm)}.portal-root .file-preview-video{display:block;width:100%;max-height:70vh;background:#000;border-radius:var(--radius-sm)}.portal-root .file-preview-audio{display:block;width:100%}.portal-root .file-preview-text{font-family:var(--mono);font-size:12.5px;line-height:1.55;max-height:60vh;overflow:auto;white-space:pre-wrap;word-break:break-word;margin:0;padding:14px;background:var(--surface);color:var(--ink);border:1px solid var(--border);border-radius:var(--radius-sm)}.portal-root .file-preview-msg{display:flex;align-items:center;gap:8px;margin:0;font-size:13px;color:var(--light)}.portal-root .file-preview-note{margin:8px 0 0;font-size:12.5px;color:var(--muted)}.portal-root .retrieval-miss-question-list{display:grid;gap:8px}.portal-root .retrieval-miss-question{width:100%;display:grid;gap:4px;padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--canvas);color:var(--ink);font:inherit;text-align:left;cursor:pointer;transition:background .12s,border-color .12s}.portal-root .retrieval-miss-question:hover{background:var(--surface)}.portal-root .retrieval-miss-question:focus-visible{outline:2px solid var(--blue);outline-offset:2px}.portal-root .retrieval-miss-question>span:first-child{font-size:13.5px;line-height:1.5}.portal-root .retrieval-miss-question>span:last-child{font-size:12px}.portal-root dialog.retrieval-miss-dialog{position:fixed;inset:0;margin:auto;height:-moz-fit-content;height:fit-content;width:min(900px,94vw);max-width:94vw;max-height:92vh;padding:0;border:0;background:transparent;color:var(--ink);overflow:visible}.portal-root dialog.retrieval-miss-dialog::backdrop{background:rgba(26,26,26,.72)}.portal-root .retrieval-miss-dialog-panel{display:flex;flex-direction:column;max-height:92vh;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--canvas);overflow:hidden}.portal-root .retrieval-miss-dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:16px 18px;border-bottom:1px solid var(--border)}.portal-root .retrieval-miss-dialog-head h2{margin-top:4px;font-size:17px;line-height:1.4}.portal-root .retrieval-miss-dialog-body{display:grid;gap:12px;padding:16px 18px 20px;overflow-y:auto;overscroll-behavior:contain}.portal-root .retrieval-miss-dialog-message{min-height:160px;display:flex;align-items:center;justify-content:center;gap:8px;color:var(--muted);font-size:13px}.portal-root .retrieval-miss-attempt{display:grid;gap:12px;padding:14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface)}.portal-root .retrieval-miss-attempt-head{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;font-size:12.5px}.portal-root .retrieval-miss-attempt-head time{margin-left:auto;color:var(--muted)}.portal-root .retrieval-miss-attempt p{margin-top:4px;font-size:13px;line-height:1.55;white-space:pre-wrap;overflow-wrap:anywhere}.portal-root .retrieval-miss-answer{padding:9px 10px;border-left:3px solid var(--orange);background:var(--canvas)}.portal-root dialog.question-preview-dialog{position:fixed;inset:0;margin:auto;height:-moz-fit-content;height:fit-content;width:min(880px,94vw);max-width:94vw;max-height:92vh;padding:0;border:0;background:transparent;color:var(--ink);overflow:visible}.portal-root dialog.question-preview-dialog::backdrop{background:rgba(26,26,26,.72)}.portal-root .question-preview-panel{display:flex;flex-direction:column;max-height:92vh;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--canvas);overflow:hidden}.portal-root .question-preview-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:16px 18px;border-bottom:1px solid var(--border)}.portal-root .question-preview-head h2{margin-top:4px;font-size:17px;line-height:1.4}.portal-root .question-preview-body{display:flex;flex-direction:column;align-items:center;gap:14px;padding:18px;overflow-y:auto;overscroll-behavior:contain}.portal-root .question-preview-message{min-height:160px;display:flex;align-items:center;justify-content:center;gap:8px;color:var(--muted);font-size:13px}.portal-root .question-preview-reveal{width:100%;max-width:760px;display:grid;gap:14px;padding:14px;border:1px dashed var(--border);border-radius:var(--radius-sm);background:var(--surface);font-size:13px}.portal-root .question-preview-reveal p{line-height:1.55;overflow-wrap:anywhere}.portal-root .question-preview-list{margin:4px 0 0 16px;display:grid;gap:4px;line-height:1.5;list-style:disc}.portal-root .question-preview-values{display:grid;grid-template-columns:minmax(120px,auto) minmax(0,1fr);gap:4px 12px;margin-top:4px}.portal-root .question-preview-values>div{display:contents}.portal-root .question-preview-values dt{color:var(--muted)}.portal-root .question-preview-values dd{overflow-wrap:anywhere}.portal-root .question-preview-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:12px 18px;border-top:1px solid var(--border);background:var(--surface2)}.portal-root dialog.post-class-dialog{position:fixed;inset:0;margin:auto;height:-moz-fit-content;height:fit-content;width:min(560px,94vw);max-width:94vw;max-height:92vh;padding:0;border:0;background:transparent;color:var(--ink);overflow:visible}.portal-root dialog.post-class-dialog::backdrop{background:rgba(26,26,26,.72)}.portal-root .post-class-dialog-panel{display:flex;flex-direction:column;max-height:92vh;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--canvas);overflow:hidden}.portal-root .post-class-dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:16px 18px;border-bottom:1px solid var(--border)}.portal-root .post-class-dialog-head h2{margin-top:4px;font-size:17px;line-height:1.4}.portal-root .post-class-dialog-body{display:grid;gap:12px;padding:16px 18px 20px;overflow-y:auto;overscroll-behavior:contain}.portal-root .post-class-dialog-body p{font-size:13px;line-height:1.55;color:var(--muted)}.portal-root .post-class-dialog-body p b{color:var(--ink)}.portal-root .post-class-dialog-lab{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:9px 11px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);font-size:13.5px}.portal-root .post-class-dialog-lab strong{flex:1;min-width:0}.portal-root 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