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var(--line);border-radius:var(--radius-md);background:var(--paper-panel);flex-wrap:wrap;align-items:end;gap:12px;margin:16px 0;padding:16px;display:flex}.enrollment-form label{color:var(--muted-strong);font-size:var(--text-sm);gap:4px;display:grid}.enrollment-queue,.group-invite{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--paper-panel);margin:18px 0;padding:16px}.panel-title-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.panel-title-row h2{font-size:var(--text-xl);margin:0}.enrollment-queue-list{gap:8px;margin:12px 0 0;padding:0;list-style:none;display:grid}.enrollment-queue-list li{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--card);flex-wrap:wrap;align-items:center;gap:12px;padding:8px 12px;display:flex}.enrollment-queue-name{color:var(--ink);font-weight:600}.enrollment-queue-group{color:var(--muted);font-size:var(--text-sm)}.enrollment-queue-note{border-radius:var(--radius-pill);background:var(--soft-green);color:var(--forest);font-size:var(--text-xs);padding:2px 8px}.group-invite-live{flex-wrap:wrap;align-items:start;gap:20px;margin-top:12px;display:flex}.group-invite-live code{border-radius:var(--radius-sm);background:var(--paper-code);font-size:var(--text-sm);overflow-wrap:anywhere;padding:4px 8px;display:inline-block}.row-actions{flex-wrap:wrap;gap:12px;display:flex}.group-login,.student-access{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--paper-panel);margin:18px 0;padding:16px}.group-login-code{font-size:var(--text-3xl);letter-spacing:.28em;margin:12px 0 4px;font-weight:700}.student-access ul{gap:8px;margin:12px 0 0;padding:0;list-style:none;display:grid}.student-access li{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--card);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:10px;padding:10px 12px;display:flex}.student-access-agent{overflow-wrap:anywhere;font-size:var(--text-sm);flex:14rem}.teacher-alert{border:1px solid var(--danger-line-soft);border-radius:var(--radius-md);background:var(--danger-bg);color:var(--ink);margin:0 0 18px;padding:12px 15px}.teacher-alert strong{color:var(--danger)}.name-fields{gap:4px;display:grid}.group-actions{flex-wrap:wrap;align-items:center;gap:12px;margin:16px 0;display:flex}.group-action-live{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--paper-panel);flex-wrap:wrap;align-items:baseline;gap:12px;padding:8px 14px;display:flex}.group-action-state{color:var(--muted-strong);font-size:var(--text-sm)}.group-roster{margin:18px 0}.group-roster-list{border-top:1px solid var(--line);max-width:34rem;margin:12px 0 0;padding:0;list-style:none}.group-roster-list li{border-bottom:1px solid var(--line);justify-content:space-between;align-items:baseline;gap:12px;padding:9px 2px;display:flex}.group-roster-note{color:var(--muted);font-size:var(--text-sm)}.group-section-title{margin-top:18px}.monitor-files{color:var(--muted-strong);font:inherit;font-size:var(--text-2xs);border-radius:var(--radius-sm);cursor:pointer;background:0 0;border:0;align-items:center;gap:1px;padding:2px 3px;line-height:1;display:flex;position:absolute;bottom:1px;right:1px}.monitor-files:hover,.monitor-files:focus-visible{color:var(--forest);background:var(--card);outline:1px solid var(--forest)}.monitor-files svg{width:11px;height:11px;display:block}.monitor-legend-clip{color:var(--muted-strong);display:inline-flex}.monitor-legend-clip svg{width:13px;height:13px}.photo-viewer{z-index:90;background:var(--photo-backdrop);flex-direction:column;display:flex;position:fixed;inset:0}.photo-bar{color:var(--on-photo);background:var(--photo-bar);flex-wrap:wrap;align-items:center;gap:10px;padding:10px 14px;display:flex}.photo-who{font-weight:600}.photo-where{color:var(--photo-aside)}.photo-spacer{margin-left:auto}.photo-tool{color:var(--on-photo);font:inherit;font-size:var(--text-sm);border:1px solid var(--photo-line);border-radius:var(--radius-pill);cursor:pointer;background:0 0;padding:5px 12px;text-decoration:none}.photo-tool:hover,.photo-tool:focus-visible,.photo-tool[aria-pressed=true]{background:var(--photo-tool-active)}.photo-zoom{align-items:center;gap:6px;display:flex}.photo-scale{min-width:4ch;color:var(--on-photo);font-size:var(--text-sm);font-variant-numeric:tabular-nums;text-align:center}.photo-tool:disabled{opacity:.45;cursor:default}.photo-tool-icon{align-items:center;gap:6px;display:inline-flex}.photo-tool-icon svg{width:14px;height:14px}.photo-stage{flex:1;justify-content:safe center;align-items:safe center;padding:18px;display:flex;overflow:auto}.photo-stage.is-draggable{cursor:grab}.photo-stage.is-draggable:active{cursor:grabbing}.photo-canvas{flex:none;position:relative}.photo-canvas img{background:var(--drawing-paper);position:absolute;top:50%;left:50%}.photo-message{max-width:46ch;color:var(--on-photo);text-align:center}.photo-message a{color:var(--on-photo)}.photo-pager{color:var(--on-photo);font-size:var(--text-sm);justify-content:center;align-items:center;gap:14px;padding:10px;display:flex}
.student-app{--ink:var(--tg-theme-text-color,#e8eef7);--muted:var(--tg-theme-hint-color,#90a2b8);--paper:var(--tg-theme-bg-color,#0f1722);--card:var(--tg-theme-secondary-bg-color,#18222f);--line:color-mix(in srgb, var(--ink) 18%, transparent);--accent:var(--tg-theme-link-color,#4c9bff);--forest:var(--tg-theme-button-color,#2f81f7);--soft-green:#2ea0434d;--student-top:max(env(safe-area-inset-top,0px), calc(var(--tg-safe-area-inset-top,0px) + var(--tg-content-safe-area-inset-top,0px)));--student-bottom:max(env(safe-area-inset-bottom,0px), var(--tg-safe-area-inset-bottom,0px));min-height:100dvh;color:var(--ink);background:var(--paper)}.student-page{max-width:640px;margin:0 auto;padding:16px 16px 40px}.student-app>.student-page:first-child{padding-top:calc(var(--student-top) + 20px)}.student-app>.student-page:not(:first-child){padding-bottom:calc(96px + var(--student-bottom))}.student-header h1{font-size:var(--text-2xl);margin:0 0 4px}.student-header p,.student-note{color:var(--muted);font-size:var(--text-md);margin:0}.student-bar{z-index:20;padding:calc(var(--student-top) + 12px) 16px 8px;border-bottom:1px solid var(--line);background:var(--paper);background:color-mix(in srgb, var(--paper) 88%, transparent);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);position:sticky;top:0}.student-bar-top{align-items:center;gap:10px;max-width:640px;margin:0 auto;display:flex}.student-app h1,.student-app h2{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Arial,sans-serif}.student-bar h1{min-width:0;font-size:var(--text-base);text-overflow:ellipsis;white-space:nowrap;flex:auto;font-weight:600;overflow:hidden}.student-clocks{align-items:stretch;gap:8px;max-width:640px;margin:10px auto 0;display:flex}.student-clock{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--card);flex:1 1 0;align-items:center;gap:7px;min-width:0;padding:6px 9px;display:flex}.student-clock>div{gap:1px;min-width:0;display:grid;overflow:hidden}.student-icon{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8px;flex:none;width:18px;height:18px}.student-clock .student-icon{color:var(--accent)}.student-clock-label{color:var(--muted);font-size:var(--text-2xs);line-height:1.2}.student-clock-value{font-size:var(--text-lg);font-variant-numeric:tabular-nums;white-space:nowrap;align-self:end;font-weight:600;line-height:1.25}.student-clocks .student-badge{flex:none;align-self:center}.student-steps{scrollbar-width:none;gap:8px;max-width:640px;margin:10px auto 0;padding:4px 2px 6px;display:flex;overflow-x:auto}.student-steps::-webkit-scrollbar{display:none}.student-step{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--card);width:40px;height:40px;color:var(--ink);cursor:pointer;font:inherit;flex:none;font-weight:700;position:relative}.student-step.active{background:var(--forest);color:var(--tg-theme-button-text-color,var(--on-accent));border-color:#0000}.student-step.submitted:after{border-radius:var(--radius-circle);background:var(--success-strong);width:17px;height:17px;color:var(--on-accent);content:"✓";font-size:var(--text-2xs);place-items:center;display:grid;position:absolute;bottom:-4px;right:-4px}.student-step.locked{opacity:.4}.student-badge{border:1px solid var(--line);border-radius:var(--radius-pill);color:var(--muted);font-size:var(--text-xs);text-transform:uppercase;padding:6px 12px}.student-card{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--card);margin-top:14px;padding:16px}.student-card-head{justify-content:space-between;align-items:baseline;gap:10px;margin-bottom:12px;display:flex}.student-card-head strong{font-size:var(--text-base)}.student-card-head strong span,.student-solved{color:var(--muted);font-size:var(--text-md);font-weight:400}.student-section{font-size:var(--text-base);margin:18px 0 8px}.student-statement{margin-bottom:16px;line-height:1.55}.student-statement-assets{flex-direction:column;gap:10px;margin-top:12px;display:flex}.student-statement-assets img{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--drawing-paper);object-fit:contain;width:100%;height:auto;max-height:60vh;padding:6px}.student-answer{border:1px solid var(--line);border-radius:var(--radius-md);background:color-mix(in srgb, var(--ink) 6%, transparent);padding:12px 14px;line-height:2.4}.student-field{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--card);min-width:96px;color:var(--ink);font:inherit;padding:7px 11px}.student-field:focus-visible{outline:2px solid var(--forest);outline-offset:1px}.student-photos{margin-top:18px}.student-photos h2{font-size:var(--text-base);margin:0 0 8px}.student-photos h2 span{color:var(--muted);font-size:var(--text-sm)}.student-photo-list{flex-wrap:wrap;gap:10px;margin:0 0 12px;padding:0;list-style:none;display:flex}.student-photo-list li{justify-items:center;gap:4px;display:grid}.student-photo-list img{border:1px solid var(--line);border-radius:var(--radius-md);object-fit:cover;width:120px;height:auto}.student-photo-list button{color:var(--accent);cursor:pointer;font-size:var(--text-sm);background:0 0;border:none;text-decoration:underline}.student-attach{border:1px dashed var(--line);border-radius:var(--radius-md);width:100%;min-height:64px;color:var(--accent);cursor:pointer;font:inherit;text-align:left;background:0 0;align-items:center;gap:12px;padding:12px 16px;font-weight:700;display:flex}.student-attach-text{flex:auto;gap:2px;min-width:0;display:grid}.student-attach-text strong{font-size:var(--text-base);line-height:1.25}.student-attach-text span{color:var(--muted);font-size:var(--text-sm);font-weight:400}.student-attach-icon{box-sizing:content-box;border-radius:var(--radius-md);background:color-mix(in srgb, var(--accent) 16%, transparent);fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8px;flex:none;width:20px;height:20px;padding:8px}.student-attach:disabled{color:var(--muted);cursor:default}.student-actions{z-index:30;max-width:640px;padding:10px 16px calc(10px + var(--student-bottom));border-top:1px solid var(--line);background:var(--paper);background:color-mix(in srgb, var(--paper) 92%, transparent);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);gap:10px;margin:0 auto;display:flex;position:fixed;bottom:0;left:0;right:0}.student-nav-button{border:1px solid var(--line);border-radius:var(--radius-md);min-height:44px;color:var(--ink);cursor:pointer;font:inherit;font-size:var(--text-md);background:0 0;flex:none;padding:11px 16px;font-weight:700}.student-nav-button:disabled{cursor:default;opacity:.4}.student-submit{flex:auto;margin:0}.student-finish{border:1px solid var(--line);border-radius:var(--radius-pill);color:var(--muted);cursor:pointer;font:inherit;font-size:var(--text-sm);white-space:nowrap;background:0 0;flex:none;padding:7px 12px}.student-finish.ready{border-color:var(--ready);background:var(--ready);color:var(--on-ready);font-weight:700}.student-start{text-align:center;justify-items:center;gap:14px;padding:28px 12px 24px;display:grid}.student-start .primary-action{min-width:200px;font-size:var(--text-base);padding:14px 24px}.student-app .primary-action{border-color:var(--forest);border-radius:var(--radius-md);background:var(--forest);box-shadow:none;color:var(--tg-theme-button-text-color,var(--on-accent))}.student-app .primary-action:hover{background:var(--forest)}.student-app .secondary-action{border-color:var(--line);border-radius:var(--radius-md);background:var(--card);color:var(--ink)}.student-app .secondary-action:hover{background:var(--card)}.student-app .primary-action:disabled,.student-app .secondary-action:disabled{cursor:default;opacity:.5}.photo-editor{z-index:60;background:var(--paper);touch-action:none;overscroll-behavior:contain;flex-direction:column;display:flex;position:fixed;inset:0}.photo-editor-head{padding:calc(var(--student-top) + 12px) 16px 12px;border-bottom:1px solid var(--line);align-items:center;gap:12px;display:flex}.photo-editor-head>div{text-align:center;flex:auto;min-width:0;margin-right:72px}.photo-editor-head h2{font-size:var(--text-base);margin:0;font-weight:600}.photo-editor-close{width:72px;color:var(--accent);cursor:pointer;font:inherit;font-size:var(--text-base);text-align:left;background:0 0;border:none;flex:none;padding:0}.photo-editor-hint{color:var(--muted);font-size:var(--text-sm);margin:2px 0 0}.photo-editor-stage{flex:auto;justify-content:center;align-items:center;min-height:0;padding:12px 16px;display:flex;overflow:hidden}.photo-editor-frame{touch-action:none;-webkit-user-select:none;user-select:none;max-width:100%;line-height:0;position:relative;overflow:hidden}.photo-editor-canvas{display:block}.photo-crop{border:2px solid var(--on-photo);cursor:move;touch-action:none;position:absolute;box-shadow:0 0 0 9999px #080c129e}.photo-crop-grid{pointer-events:none;background-image:linear-gradient(#ffffff59 1px,#0000 1px),linear-gradient(90deg,#ffffff59 1px,#0000 1px);background-position:0 33.333%,33.333% 0;background-size:100% 33.333%,33.333% 100%;position:absolute;inset:0}.photo-crop-handle{touch-action:none;background:#ffffff2e;position:absolute}.photo-crop-handle.nw,.photo-crop-handle.ne,.photo-crop-handle.sw,.photo-crop-handle.se{border:3px solid var(--on-photo);border-radius:var(--radius-circle);width:24px;height:24px}.photo-crop-handle.nw{cursor:nwse-resize;top:-12px;left:-12px}.photo-crop-handle.ne{cursor:nesw-resize;top:-12px;right:-12px}.photo-crop-handle.sw{cursor:nesw-resize;bottom:-12px;left:-12px}.photo-crop-handle.se{cursor:nwse-resize;bottom:-12px;right:-12px}.photo-crop-handle.n,.photo-crop-handle.s{border-top:3px solid var(--on-photo);border-bottom:3px solid var(--on-photo);border-radius:var(--radius-xs);cursor:ns-resize;width:56px;height:22px;margin-left:-28px;left:50%}.photo-crop-handle.n{top:-11px}.photo-crop-handle.s{bottom:-11px}.photo-crop-handle.w,.photo-crop-handle.e{border-right:3px solid var(--on-photo);border-left:3px solid var(--on-photo);border-radius:var(--radius-xs);cursor:ew-resize;width:22px;height:56px;margin-top:-28px;top:50%}.photo-crop-handle.w{left:-11px}.photo-crop-handle.e{right:-11px}.photo-editor-tools{border-top:1px solid var(--line);justify-content:space-around;gap:8px;padding:10px 12px;display:flex}.photo-editor-tools button{border-radius:var(--radius-md);color:var(--ink);cursor:pointer;font:inherit;font-size:var(--text-xs);text-align:center;background:0 0;border:none;flex:1 1 0;justify-items:center;gap:6px;padding:8px 4px;line-height:1.2;display:grid}.photo-editor-tools button:disabled{cursor:default;opacity:.45}.photo-editor-zoom{min-width:46px;color:var(--muted);font-size:var(--text-xs);font-variant-numeric:tabular-nums;text-align:center;align-self:center;line-height:1.2}.photo-editor-tools .student-icon{width:24px;height:24px}.photo-editor-actions{padding:10px 16px calc(10px + var(--student-bottom));gap:10px;display:flex}.photo-editor-actions>button{border-radius:var(--radius-md);flex:1 1 0;min-height:48px}.photo-editor-cancel{border:1px solid var(--line);background:var(--card);color:var(--ink);cursor:pointer;font:inherit;font-size:var(--text-md);font-weight:700}.access-links code{overflow-wrap:anywhere;font-size:var(--text-sm);display:block}.access-links ul{gap:10px;padding:0;list-style:none;display:grid}.student-assignment{cursor:pointer;width:100%;font:inherit;text-align:left;gap:4px;display:grid}.student-assignment strong{font-size:var(--text-base)}.student-assignment span,.student-assignment em{color:var(--muted);font-size:var(--text-sm);font-style:normal}.telegram-link{gap:4px;display:grid}.telegram-link code{overflow-wrap:anywhere;font-size:var(--text-sm)}.telegram-link em{color:var(--muted);font-size:var(--text-xs);font-style:normal}.student-report-total{font-size:var(--text-xl);margin-bottom:12px}.student-report-list{gap:10px;margin:0;padding:0;list-style:none;display:grid}.student-report-list li{border:1px solid var(--line);border-radius:var(--radius-md);padding:10px 12px}.student-report-list li.verdict-right{border-color:var(--success-line)}.student-report-list li.verdict-wrong{border-color:var(--danger-line-soft)}.student-report-line{justify-content:space-between;gap:12px;font-weight:700;display:flex}.student-report-answer{color:var(--muted-strong);font-size:var(--text-sm)}.student-report-verdict{font-weight:700}.student-report-comment{margin-top:6px}.student-verdict{border-radius:var(--radius-md);font-size:var(--text-lg);text-align:center;margin:12px 0;padding:10px 14px;font-weight:700}.student-verdict.verdict-right{background:var(--grid-right);color:var(--forest-deep)}.student-verdict.verdict-wrong{background:var(--grid-wrong);color:var(--danger)}.student-verdict.verdict-partial{background:var(--grid-partial);color:var(--ink)}.student-verdict.verdict-manual{background:var(--grid-unknown);color:var(--ink)}.student-login{gap:10px;display:grid}.student-login label{color:var(--muted);font-size:var(--text-md)}.student-login input{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--paper);min-height:44px;color:var(--ink);font:inherit;font-size:var(--text-2xl);letter-spacing:.2em;text-align:center;padding:10px 14px}.student-login>button[type=submit]{border:1px solid var(--accent);border-radius:var(--radius-md);background:var(--accent);min-height:44px;color:var(--on-accent);cursor:pointer;font:inherit;font-size:var(--text-md);font-weight:700}.student-login>button[type=submit]:disabled{border-color:var(--line);color:var(--muted);cursor:default;background:0 0}.student-secondary{border:1px solid var(--line);border-radius:var(--radius-md);width:100%;min-height:44px;color:var(--ink);cursor:pointer;font:inherit;font-size:var(--text-md);text-align:left;background:0 0;padding:11px 16px}.student-secondary:disabled{cursor:default;opacity:.4}.student-secondary .student-note{display:inline}a.student-secondary{text-align:center;margin-top:10px;display:block}.student-drawing{width:100%;color:inherit;cursor:zoom-in;font:inherit;touch-action:manipulation;background:0 0;border:none;padding:0;display:block;position:relative}.student-drawing-badge{border:1px solid var(--line);border-radius:var(--radius-circle);background:var(--card);width:34px;height:34px;color:var(--ink);pointer-events:none;place-items:center;display:grid;position:absolute;bottom:10px;right:10px}.drawing-viewer{z-index:60;background:var(--paper);touch-action:none;overscroll-behavior:contain;flex-direction:column;display:flex;position:fixed;inset:0}.drawing-viewer-head{padding:calc(var(--student-top) + 12px) 16px 12px;border-bottom:1px solid var(--line);align-items:center;gap:12px;display:flex}.drawing-viewer-close{color:var(--accent);cursor:pointer;font:inherit;font-size:var(--text-base);background:0 0;border:none;flex:none;padding:0}.drawing-viewer-hint{min-width:0;color:var(--muted);font-size:var(--text-sm);text-align:right;flex:auto;margin:0}.drawing-viewer-stage{flex:auto;justify-content:center;align-items:center;min-height:0;padding:12px;display:flex;overflow:hidden}.drawing-viewer-frame{touch-action:none;-webkit-user-select:none;user-select:none;position:relative;overflow:hidden}.drawing-viewer-sheet{background:var(--drawing-paper);transform-origin:0 0;position:absolute;top:0;left:0}.drawing-viewer-sheet img{width:100%;height:100%;display:block}.drawing-viewer-tools{padding:10px 16px calc(10px + var(--student-bottom));border-top:1px solid var(--line);justify-content:center;align-items:center;gap:18px;display:flex}.drawing-viewer-tools button{border-radius:var(--radius-md);min-width:56px;min-height:48px;color:var(--ink);cursor:pointer;font:inherit;background:0 0;border:none;place-items:center;padding:8px;display:grid}.drawing-viewer-tools button:disabled{cursor:default;opacity:.45}.drawing-viewer-tools .student-icon{width:24px;height:24px}.drawing-viewer-zoom{min-width:52px;color:var(--muted);font-size:var(--text-md);font-variant-numeric:tabular-nums;text-align:center}.student-statement-assets img[data-vector],.drawing-viewer-sheet[data-vector]{filter:invert()hue-rotate(180deg);background:0 0}:root[data-tg-scheme=light] .student-statement-assets img[data-vector],:root[data-tg-scheme=light] .drawing-viewer-sheet[data-vector]{background:var(--drawing-paper);filter:none}.drawing-viewer-paper{border-radius:var(--radius-pill);min-width:auto;color:var(--muted);font-size:var(--text-md);padding:8px 12px}.drawing-viewer-paper[aria-pressed=true]{background:color-mix(in srgb, var(--ink) 12%, transparent);color:var(--ink)}.student-app{--keyboard-key:color-mix(in srgb, var(--ink) 12%, var(--card));--keyboard-key-op:color-mix(in srgb, var(--ink) 5%, var(--card));--keyboard-key-pressed:color-mix(in srgb, var(--ink) 24%, var(--card));--student-danger:var(--danger-on-dark)}:root[data-tg-scheme=light] .student-app{--keyboard-key:var(--paper);--keyboard-key-op:color-mix(in srgb, var(--ink) 7%, var(--card));--keyboard-key-pressed:color-mix(in srgb, var(--ink) 14%, var(--card));--student-danger:var(--danger-strong)}.student-field.formula-input{min-width:12em}.student-field[aria-invalid=true]{border-color:var(--student-danger)}.formula-field{vertical-align:middle;align-items:center;max-width:100%;display:inline-flex;position:relative}.formula-field-return{display:none}.formula-field[data-system] .formula-input{padding-right:42px}.formula-field[data-system] .formula-field-return{border-radius:var(--radius-sm);background:color-mix(in srgb, var(--accent) 18%, transparent);width:30px;height:26px;color:var(--accent);cursor:pointer;font-family:KaTeX_Math,Times New Roman,serif;font-size:var(--text-base);border:none;place-items:center;padding:0;font-style:italic;font-weight:700;display:grid;position:absolute;right:5px}.formula-preview{border-bottom:1px dashed var(--line);align-items:center;gap:12px;min-height:56px;margin-bottom:8px;padding-bottom:8px;line-height:1.3;display:flex}.formula-preview-label{max-width:3.6em;color:var(--muted);font-size:var(--text-xs);flex:none;line-height:1.2}.formula-preview-math{min-width:0;font-size:var(--text-xl);overflow-x:auto}.formula-preview[data-state=pending] .formula-preview-math{opacity:.55}.formula-preview-error{color:var(--muted);font-size:var(--text-md)}.formula-preview[data-state=bad] .formula-preview-error{color:var(--student-danger)}.formula-preview[data-note]{flex-wrap:wrap}.formula-preview-note{color:var(--student-danger);font-size:var(--text-md);flex:1 0 100%;line-height:1.35}.formula-preview-icon{fill:none;width:20px;height:20px;stroke:var(--student-danger);stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8px;flex:none}.student-keyboard-sheet{z-index:30;max-width:640px;margin:0 auto;position:fixed;bottom:0;left:0;right:0}.student-app>.student-page.with-keyboard{padding-bottom:calc(400px + var(--student-bottom))}.formula-keyboard{-webkit-user-select:none;user-select:none;gap:6px;display:grid}.formula-keyboard-sheet{padding:8px 8px calc(8px + var(--student-bottom));border-top:1px solid var(--line);background:var(--card)}.formula-keyboard-panel{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--paper);margin-top:12px;padding:10px}.formula-keyboard-row{grid-template-columns:repeat(var(--columns,6), minmax(0, 1fr));gap:6px;display:grid}.formula-keyboard-layer{align-content:start;gap:6px;min-height:202px;display:grid}.formula-keyboard-layer-set{min-height:254px}.formula-key{border-radius:var(--radius-md);background:var(--keyboard-key);min-width:0;height:46px;color:var(--ink);cursor:pointer;font:inherit;font-size:var(--text-2xl);touch-action:manipulation;-webkit-tap-highlight-color:transparent;border:none;place-items:center;padding:0 4px;display:grid}:root[data-tg-scheme=light] .formula-key{box-shadow:0 1px 0 var(--line)}.formula-key:active{background:var(--keyboard-key-pressed)}.formula-key-op{background:var(--keyboard-key-op)}.formula-key-math{font-family:KaTeX_Math,Times New Roman,serif;font-style:italic}.formula-key-word{font-size:var(--text-md);font-weight:700}.formula-key-done{background:var(--forest);color:var(--tg-theme-button-text-color,var(--on-accent));font-size:var(--text-base);font-weight:700}.formula-key-glyph .katex{font-size:1.1em}.formula-key{overflow:hidden}.formula-key>*{pointer-events:none}.formula-key-icon{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.8px;width:22px;height:22px}.formula-keyboard-vars{scrollbar-width:none;align-items:center;gap:6px;min-height:40px;display:flex;overflow-x:auto}.formula-keyboard-vars::-webkit-scrollbar{display:none}.formula-keyboard-vars-label{max-width:4.6em;color:var(--muted);font-size:var(--text-2xs);flex:none;margin:0 4px 0 2px;line-height:1.2}.formula-key-var{background:color-mix(in srgb, var(--accent) 18%, var(--card));min-width:48px;height:40px;color:var(--accent);font-size:var(--text-lg);flex:none;padding:0 12px}.formula-keyboard-hint{min-height:40px;color:var(--muted);font-size:var(--text-sm);align-items:center;margin:0;padding:0 2px;display:flex}.formula-keyboard-hint b{color:var(--ink);margin-left:.3em}.formula-keyboard-bottom{grid-template-columns:2fr 1fr 1fr 2fr}.formula-keyboard-panel .formula-keyboard-bottom{grid-template-columns:3fr 1fr 2fr}.formula-keyboard-layers{border-radius:var(--radius-md);background:var(--keyboard-key-op);grid-template-columns:repeat(3,minmax(0,1fr));gap:3px;padding:3px;display:grid}.formula-keyboard-layers button{border-radius:var(--radius-sm);color:var(--muted);cursor:pointer;font:inherit;font-size:var(--text-md);background:0 0;border:none;padding:0;font-weight:700}.formula-keyboard-layers button[aria-pressed=true]{background:var(--keyboard-key);color:var(--ink)}.formula-keyboard-number .formula-key{height:52px}.formula-keyboard-head{color:var(--muted);font-size:var(--text-sm);justify-content:space-between;align-items:center;gap:12px;display:flex}.formula-keyboard-hide,.formula-keyboard-show{color:var(--accent);cursor:pointer;font:inherit;font-size:var(--text-sm);background:0 0;border:none;padding:4px 0;font-weight:700}.formula-keyboard-show{margin-top:8px}.formula-keyboard-panel .formula-key{height:40px;font-size:var(--text-lg)}.formula-keyboard-panel .formula-key-word{font-size:var(--text-md)}.formula-keyboard-panel .formula-keyboard-layer{min-height:178px}.formula-keyboard-panel .formula-keyboard-layers{height:40px}.student-actions.with-warning{flex-wrap:wrap}.student-unparsed{border-radius:var(--radius-md);background:color-mix(in srgb, var(--student-danger) 16%, transparent);color:var(--student-danger);font-size:var(--text-md);flex:100%;align-items:flex-start;gap:10px;margin:0;padding:10px 12px;line-height:1.4;display:flex}.student-answer .student-field{margin-block:4px}.student-statement a,.student-statement a:visited{color:var(--accent);overflow-wrap:anywhere;-webkit-text-decoration-color:color-mix(in srgb, var(--accent) 45%, transparent);text-decoration-color:color-mix(in srgb, var(--accent) 45%, transparent);text-underline-offset:3px;text-decoration-thickness:1px}