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6px);z-index:20;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;width:min(440px,calc(100vw - 32px));max-height:min(360px,calc(100vh - 128px));overflow-y:auto;padding:10px;border:1px solid var(--chat-line);border-radius:12px;background:var(--chat-panel-strong);box-shadow:0 14px 32px var(--chat-shadow)}.math-symbol-menu-close{grid-column:1/-1;display:flex;justify-content:flex-end;height:16px}.math-symbol-menu-close button{display:grid;place-items:center;width:20px;height:20px;padding:0;border:0;background:transparent;color:var(--chat-muted);font-size:17px;line-height:1}.math-symbol-menu>div{min-width:0}.math-symbol-menu small{display:block;margin:0 0 4px;color:var(--chat-muted);font-size:11px;font-weight:700}.math-symbol-menu p{display:grid;grid-template-columns:repeat(auto-fill,minmax(24px,1fr));gap:3px;margin:0}.math-symbol-menu p button{min-width:0;height:24px;padding:0;border:1px solid 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.companion-card-choices{gap:8px}.chat-shell .companion-card button{min-height:var(--ui-control-height);padding:4px 10px;border-color:#f06c7659;border-radius:999px;background:var(--chat-soft);color:var(--chat-ink)}.chat-shell .companion-card button.confirmed{border-color:#73cbb9;background:var(--chat-student);color:#27405b}:root[data-theme=dark] .chat-shell{--chat-page-start: #151d3a;--chat-page-mid: #252653;--chat-page-end: #3a254d;--chat-sidebar: rgba(16, 23, 46, .82);--chat-sidebar-border: rgba(255, 255, 255, .1);--chat-panel: rgba(16, 23, 46, .3);--chat-panel-strong: rgba(45, 49, 92, .82);--chat-line: rgba(203, 211, 235, .18);--chat-ink: #f5f7ff;--chat-muted: #aeb8d8;--chat-soft: #30305e;--chat-selected: #394273;--chat-accent: #ff8b87;--chat-student: #2d5360;--chat-shadow: rgba(8, 13, 34, .35)}:root[data-theme=dark] .chat-shell .companion-new{color:#f0f3ff!important}:root[data-theme=dark] .chat-shell .student-turn{color:#eaf0ff}:root[data-theme=dark] .chat-shell .companion-composer{background:transparent}:root[data-theme=dark] .chat-shell .companion-composer textarea,:root[data-theme=dark] .chat-shell .companion-composer textarea:focus{background:transparent!important;background-color:transparent!important;box-shadow:none!important}:root[data-theme=dark] .chat-shell .companion-composer textarea::placeholder{color:#aeb8d8!important}.chat-shell-composer-centered .chat-shell-composer{position:absolute;inset:50% 0 auto;height:auto;transform:translateY(-50%)}.chat-shell .companion-entry-label{display:inline-flex;align-items:center;gap:9px;min-width:0}.chat-shell .companion-entry-label .brain-task-group-icon{width:18px;height:18px;flex:0 0 18px;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8}.chat-shell 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var(--student-line);border-radius:var(--ui-radius-control);background:var(--student-field);color:var(--student-text);font:inherit;font-size:20px}.subproject-rename-close{position:absolute;top:18px;right:18px;width:32px;min-height:32px!important;padding:0!important;border:0!important;background:transparent!important;color:var(--student-muted)!important;font-size:28px!important;line-height:1}.subproject-rename-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:24px}.subproject-rename-actions button{min-width:96px}:root[data-theme] .subproject-rename-actions .quiet{border-color:var(--student-line)!important;background:var(--student-surface)!important;color:var(--student-text)!important}.subproject-rename-actions .quiet:hover:not(:disabled),.subproject-rename-actions .quiet:focus-visible{border-color:var(--student-line-strong)!important;background:var(--student-selected)!important;color:var(--student-text)!important}.subproject-delete-backdrop{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:20px;background:#090e1d8a;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.subproject-delete-dialog{width:min(520px,100%);padding:34px;border:1px solid var(--student-line);border-radius:var(--ui-radius-panel);background:var(--student-surface-raised);box-shadow:0 24px 64px var(--student-shadow);color:var(--student-text)}.subproject-delete-dialog h2{margin:0;font-size:28px}.subproject-delete-dialog>p{margin:10px 0 0;color:var(--student-muted);font-size:16px;line-height:1.65}.subproject-delete-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:28px}.subproject-delete-actions button{min-width:108px}.subproject-delete-confirm{border-color:#ff7e8773!important;background:linear-gradient(135deg,#ef5e71,#cf3652)!important;color:#fff!important}.sign-out-confirm-backdrop{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:20px;background:#090e1d8a;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.sign-out-confirm-dialog{width:min(520px,100%);padding:34px;border:1px solid var(--student-line);border-radius:var(--ui-radius-panel);background:var(--student-surface-raised);box-shadow:0 24px 64px var(--student-shadow);color:var(--student-text)}.sign-out-confirm-dialog h2{margin:0;font-size:28px}.sign-out-confirm-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:28px}.sign-out-confirm-actions button{min-width:108px}.answer-task-cancel-trigger{position:fixed;top:10px;right:18px;z-index:26;width:34px;min-height:34px!important;padding:0!important;border:0!important;background:transparent!important;color:var(--student-muted)!important;font-size:30px!important;font-weight:300!important;line-height:1!important}.answer-task-cancel-trigger:hover{color:var(--student-text)!important}.task-cancel-backdrop{position:fixed;inset:0;z-index:110;display:grid;place-items:center;padding:20px;background:#090e1d8a;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.task-cancel-dialog{width:min(520px,100%);padding:34px;border:1px solid var(--student-line);border-radius:var(--ui-radius-panel);background:var(--student-surface-raised);box-shadow:0 24px 64px var(--student-shadow);color:var(--student-text)}.task-cancel-dialog h2{margin:0;font-size:30px}.task-cancel-dialog>p{margin:10px 0 0;color:var(--student-muted);font-size:16px;line-height:1.65}.task-cancel-dialog .task-cancel-error{color:var(--student-danger)}.task-cancel-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:28px}.task-cancel-actions button{min-width:96px}@media(max-width:700px){.chat-shell .companion-sidebar{width:276px;min-width:276px;border-radius:0 22px 22px 0}.chat-shell .companion-main header{height:58px;padding:0 15px}.chat-shell .companion-empty{padding:0 20px 154px}.chat-shell .companion-empty h1{font-size:28px}.chat-shell .companion-messages{padding:28px 16px calc(var(--student-chat-content-bottom) + var(--chat-message-clearance))}.chat-shell .companion-turn,.chat-shell .student-turn{max-width:94%}.chat-shell .chat-shell-composer{left:0}.chat-shell .companion-composer{width:calc(100% - 28px);padding:8px 10px 8px 12px;gap:0 6px}.chat-shell .companion-mode{display:none!important}.chat-shell .companion-attach{margin-left:-4px}}.chat-shell-empty .chat-shell-composer{position:absolute;inset:50% 0 auto;height:auto;transform:translateY(-38px)}.chat-shell-empty .companion-composer{height:auto;min-height:0}.chat-shell-guest .guest-register{margin-top:auto;padding:10px 14px;border:1px solid rgba(240,108,118,.28);border-radius:999px;background:var(--chat-soft)!important;color:var(--chat-ink)!important;font-weight:700;text-align:center}.chat-shell-content{display:contents}.chat-shell-empty-content{position:absolute;top:50%;right:0;left:0;display:flex;flex-direction:column;align-items:center;gap:24px;transform:translateY(-50%)}.chat-shell-guest:has(.guest-floating-menu) .chat-shell-empty .chat-shell-empty-content{top:0;bottom:0;transform:none;justify-content:center}.chat-shell-guest.chat-shell-empty .companion-empty{position:static;padding:0;transform:none}.chat-shell-guest.chat-shell-empty .chat-shell-composer{position:static;transform:none;width:100%}.chat-shell-composer-centered .companion-empty{position:absolute;top:50%;right:0;left:0;height:auto;padding:0;transform:translateY(calc(-50% - 28px))}.chat-shell-composer-centered .chat-shell-composer{position:absolute;inset:50% 0 auto;height:auto;transform:translateY(8px)}.chat-shell-composer-centered .companion-composer{height:auto;min-height:0}.chat-shell .companion-entry span{color:#fff;font-size:16px;font-weight:300;line-height:1}.auth-gate{--auth-start: #edf7ff;--auth-mid: #f7f2ff;--auth-end: #fff0e8;--auth-card: rgba(255, 255, 255, .74);--auth-line: rgba(95, 105, 145, .22);--auth-field: rgba(255, 255, 255, .72);--auth-field-focus: rgba(255, 255, 255, .94);--auth-ink: #18223e;--auth-muted: #53607e;--auth-accent: #f06c76;position:relative;isolation:isolate;overflow:hidden;min-height:100vh;display:grid;place-items:center;padding:clamp(24px,6vw,72px);background:radial-gradient(circle at 88% -8%,rgba(255,140,186,.16) 0 14rem,transparent 14.1rem),radial-gradient(circle at 4% 102%,rgba(99,216,195,.13) 0 12rem,transparent 12.1rem),linear-gradient(135deg,var(--auth-start),var(--auth-mid) 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var(--auth-line);border-radius:var(--ui-radius-control);outline:none;background:var(--auth-field);color:var(--auth-ink);font-size:var(--ui-body-size);transition:border-color .18s ease,box-shadow .18s ease,background-color .18s ease}.auth-gate-card input::placeholder{color:#7c88a3}.auth-gate-card input:focus{border-color:var(--auth-accent);background:var(--auth-field-focus);box-shadow:0 0 0 4px #f06c7624}.auth-gate-card .primary{width:100%;margin:18px 0 0;border:0;background:var(--auth-accent);box-shadow:none!important;color:var(--student-auth-success-ink)}.auth-gate-card .primary:hover:not(:disabled){box-shadow:none!important;transform:none!important}.auth-gate-card .auth-switch,.auth-gate-card .auth-back{display:block;min-height:32px;padding:4px 10px;border:1px solid transparent;border-radius:999px;background:transparent;color:var(--auth-muted);font-size:var(--ui-text-size);appearance:none;-webkit-appearance:none}.auth-gate-card .auth-switch{margin:8px auto 0;text-decoration:underline;text-underline-offset:4px}.auth-gate-card .auth-back{width:100%;margin-top:4px}.auth-gate-card .auth-switch:hover:not(:disabled),.auth-gate-card .auth-back:hover:not(:disabled){border-color:var(--auth-line);background:#ffffff14;color:var(--auth-accent);transform:none!important}.auth-gate-card [role=alert],.auth-gate-card>p[aria-live]{margin:14px 0 0;color:#b34d5a;font-size:13px;line-height:1.55}:root[data-theme=dark] .auth-gate{--auth-start: #151d3a;--auth-mid: #252653;--auth-end: #3a254d;--auth-card: rgba(16, 23, 46, .78);--auth-line: rgba(203, 211, 235, .22);--auth-field: rgba(45, 49, 92, .72);--auth-field-focus: rgba(57, 66, 115, .86);--auth-ink: #f5f7ff;--auth-muted: #aeb8d8;--auth-accent: #ff8b87}:root[data-theme=dark] .auth-gate-card{border-color:#ffffff1f;box-shadow:0 22px 64px #080d2261}:root[data-theme=dark] .auth-gate-card input::placeholder{color:#aeb8d8}:root[data-theme=dark] .auth-gate-card [role=alert],:root[data-theme=dark] .auth-gate-card>p[aria-live]{color:#ffaaa2}@media(max-width:600px){.auth-gate{align-items:start;padding:32px 16px}.auth-gate-card{padding:28px 22px;border-radius:22px}}.companion-problem-mode{display:flex;height:100dvh;min-height:100vh;padding:0;overflow:hidden;background:linear-gradient(135deg,#edf7ff,#f7f2ff 58%,#fff0e8)}.chat-shell.companion-problem-mode{display:flex}.chat-shell.companion-problem-mode>.chat-shell-sidebar,.chat-shell.companion-problem-mode>.chat-shell-sidebar-resizer{display:none}:root[data-theme=dark] .companion-problem-mode{background:linear-gradient(135deg,var(--chat-page-start),var(--chat-page-mid) 58%,var(--chat-page-end))}.companion-problem-mode .companion-main{width:100%;height:100%;min-height:0;overflow:hidden;background:transparent}.companion-problem-mode .companion-main>header{position:relative;z-index:6;height:62px;flex:0 0 62px;padding:0 28px;border:1px solid rgba(255,255,255,.75);border-radius:0;background:#ffffffd1;color:#18223e}.learning-command-diagnostic-title{margin:0;color:inherit;font-size:17px;font-weight:700}.companion-problem-mode .companion-main>[data-answer-layout=fullscreen]{flex:1 1 auto;width:100%;min-height:0;height:auto;overflow:hidden;box-sizing:border-box;min-height:calc(100dvh - 62px)}.companion-problem-mode .companion-main>[data-answer-layout=fullscreen].tutoring-workspace{flex:1 1 0;height:0;min-height:0;padding-bottom:0}.companion-problem-mode .companion-main>[data-answer-layout=summary]{flex:1 1 auto;width:100%;min-height:0;height:auto;overflow-y:auto;box-sizing:border-box;place-items:start center;padding-bottom:48px}.companion-problem-mode [data-answer-layout=fullscreen]{display:grid;grid-template-columns:minmax(0,566fr) minmax(0,582fr);grid-template-rows:minmax(0,1fr);position:relative;z-index:7;isolation:isolate;color:var(--chat-ink, #f5f7ff);padding:var(--student-safe-top) 2px 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scale(1.03);transform-origin:center bottom}.companion-picker-card .companion-character-nova{transform:scale(.95);transform-origin:center bottom}.companion-picker-card.is-selected .companion-character-nova{transform:scale(.99);transform-origin:center bottom}@media(min-width:701px){.companion-picker-card{border-radius:clamp(10px,3vw,18px)}}@media(max-width:700px){.companion-picker-card:not(.is-selected) .companion-character-hugo{transform:translateY(12.55cqw) scale(1.03)}.companion-picker-card.is-selected .companion-character-hugo{transform:translateY(13.62cqw) scale(1.07)}}@media(min-width:701px)and (max-height:520px){.companion-picker{padding:clamp(6px,2dvh,10px);gap:clamp(3px,1dvh,6px)}.companion-picker-orbit{width:clamp(20px,7dvh,28px);height:clamp(20px,7dvh,28px);margin-bottom:clamp(2px,1dvh,5px);font-size:clamp(14px,4.5dvh,19px)}.companion-picker-kicker{margin-bottom:clamp(1px,.7dvh,3px);font-size:clamp(7px,2.4dvh,10px);line-height:1}.companion-picker 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.companion-mic{grid-column:2;grid-row:2}.companion-problem-mode [data-answer-layout=fullscreen] .companion-chat-composer.is-multiline .math-symbol-picker{grid-column:3;grid-row:2}.companion-problem-mode [data-answer-layout=fullscreen] .companion-chat-composer.is-multiline .companion-send-icon{grid-column:4;grid-row:2}.companion-problem-mode [data-answer-layout=fullscreen] .answer-pane-toggle{color:var(--student-muted)}.companion-problem-mode [data-answer-layout=fullscreen] .answer-pane-toggle:hover{background:var(--student-selected);color:var(--student-text)}.companion-problem-mode .companion-tabs,.companion-problem-mode .companion-tabs .active{background:var(--student-surface-raised)}.companion-problem-mode .companion-tabs button{color:var(--student-muted)}.companion-problem-mode .companion-tabs .active{color:var(--student-text)}.companion-problem-mode [data-answer-layout=fullscreen] .open-scratch-action,.companion-problem-mode .tutoring-scratch .scratch-toolbar,.companion-problem-mode .tutoring-scratch .scratch-tool-capsule,.companion-problem-mode .tutoring-scratch .scratch-utility-group,.companion-problem-mode .tutoring-scratch .scratch-size-popover{border-color:var(--student-line);background:var(--student-surface);color:var(--student-text)}.companion-problem-mode .tutoring-scratch .scratch-toolbar{border-color:transparent;background:transparent}.companion-problem-mode .tutoring-scratch .scratch-toolbar button.is-selected,.companion-problem-mode .tutoring-scratch .scratch-utility-group>button:hover:not(:disabled){border-color:var(--student-line-strong);background:var(--student-selected);color:var(--student-text)}.companion-problem-mode .tutoring-scratch .scratch-shape-triangle:after{background:var(--student-surface)}.companion-problem-mode .tutoring-scratch .scratch-canvas-stage>canvas{border-color:var(--student-line);background-color:var(--student-field);background-image:linear-gradient(var(--student-grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--student-grid-line) 1px,transparent 1px)}:is(.companion-problem-mode,.tutoring-workspace) .tutoring-chat .structured-coach-message{line-height:var(--student-answer-leading)}:is(.companion-problem-mode,.tutoring-workspace) .tutoring-chat .nova-student-prompt{display:inline;margin-top:0;color:inherit;font-weight:inherit}:is(.companion-problem-mode,.tutoring-workspace) .tutoring-chat .nova-verified-answer{display:block;margin-bottom:var(--student-space-answer-semantic);color:var(--student-success);font-weight:650}.nova-reveal-char{animation:nova-reveal-char .08s ease-out both}@keyframes nova-reveal-char{0%{opacity:0}to{opacity:1}}@media(prefers-reduced-motion:reduce){.nova-reveal-char{animation:none}}.guest-diagnostic-question,.guest-assessment section{border-color:var(--student-line);background:var(--student-surface-raised);color:var(--student-text)}.guest-diagnostic-question-copy h1,.guest-diagnostic-response 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