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68px)}.student-sidebar{background:var(--surface-muted);padding:26px 18px;border-right:1px solid var(--line);min-width:0}.section-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.count{color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}.student-create{flex-direction:column;gap:7px;padding-bottom:24px;margin-bottom:12px;border-bottom:1px solid var(--line)}.student-create label{font-size:12px;color:var(--muted)}.student-create button{display:flex;justify-content:center;align-items:center;gap:6px}.student-list{display:flex;flex-direction:column;gap:3px}.student-list button{display:flex;align-items:center;gap:12px;border-color:transparent;border-radius:3px;background:transparent;padding:11px 10px;text-align:left}.student-list button svg{flex:none;color:#7a8678}.student-list button span{overflow-wrap:anywhere}.student-list button.active{background:#e1e8dc;border-color:#d0dbc9;color:#234a34;font-weight:600}.student-list button.active svg{color:#285c49}.boards-panel{width:100%;max-width:1180px;padding:38px 48px 80px;min-width:0}.page-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:28px}.page-heading h1{overflow-wrap:anywhere}.section-label{color:var(--muted);font-size:12px;margin:0 0 8px}.link-box{display:grid;grid-template-columns:155px minmax(0,1fr);gap:5px 14px;align-items:center;border:1px solid var(--line);background:#f2f4ed;padding:14px 16px;margin-bottom:32px;font-size:12px}.link-label{display:flex;align-items:center;gap:7px;color:#455642}.link-label svg{flex:none;width:17px;height:17px}.link-box input{width:100%;font-size:12px;font-family:ui-monospace,Consolas,monospace;background:transparent;border-color:transparent;padding:5px 0;color:#3b5143}.link-box input:hover{border-bottom-color:#bac6b4}.link-box small{grid-column:2;color:var(--muted);font-size:11px}.link-box p{margin:0}.link-box .loading-state{padding:5px;font-size:12px}.board-create{margin-bottom:30px;max-width:650px}.board-create button{display:inline-flex;gap:6px;align-items:center;white-space:nowrap}.board-list-head,.board-list article{display:grid;grid-template-columns:minmax(0,1fr) 150px 100px;gap:18px;align-items:center}.board-list-head{color:var(--muted);font-size:12px;padding:0 0 10px 40px;border-bottom:1px solid #cbd2c6;grid-template-columns:minmax(0,1fr) 150px 100px}.board-list article{padding:17px 0;border-bottom:1px solid var(--line)}.board-title{display:flex;align-items:center;gap:14px;min-width:0}.board-title svg{color:#71826c;flex:none}.board-title input{min-width:0;width:100%;font-weight:550;padding:6px;margin-left:-6px;border-color:transparent;background:transparent;text-overflow:ellipsis}.board-title input:hover{border-color:var(--line);background:var(--surface)}.board-list time{color:var(--muted);font-size:12px}.board-list button{display:inline-flex;justify-content:space-between;align-items:center;gap:8px;font-size:12px;background:transparent}.board-list button svg{width:16px;height:16px}.dashboard-empty{align-self:start;padding:120px 48px;color:var(--muted)}.dashboard-empty>svg{width:36px;height:36px;margin-bottom:20px;color:#87957d}.dashboard-empty h1{color:var(--text);font-size:23px}.dashboard-empty p{font-size:14px}.empty-list{color:var(--muted);font-size:13px;padding:24px 0}.student-workspace{grid-template-columns:minmax(0,1fr)}.student-workspace .boards-panel{max-width:1100px;margin:auto}@media(max-width:1000px){.dashboard-workspace{grid-template-columns:230px minmax(0,1fr)}.boards-panel{padding:28px 24px 60px}.link-box{grid-template-columns:1fr}.link-box small{grid-column:1}.board-list-head,.board-list article{grid-template-columns:minmax(0,1fr) 112px 90px;gap:10px}.student-workspace{grid-template-columns:minmax(0,1fr)}}@media(max-width:680px){.app-header{padding:12px 16px;gap:12px}.header-context{display:none}.dashboard-workspace{display:block}.student-sidebar{padding:18px 16px;border-right:0;border-bottom:1px solid var(--line)}.section-heading{margin-bottom:12px}.student-create{display:grid;grid-template-columns:minmax(0,1fr) auto;padding-bottom:16px}.student-create label{grid-column:1 / -1}.student-list{max-height:180px;overflow:auto}.boards-panel{padding:24px 16px 50px}.page-heading{margin-bottom:20px}.board-create{flex-direction:column}.board-create button{justify-content:center}.board-list-head{display:none}.board-list article{grid-template-columns:minmax(0,1fr) 90px;gap:3px 12px;padding:14px 0}.board-list time{grid-column:1;padding-left:34px}.board-list button{grid-column:2;grid-row:1 / 3}.dashboard-empty{padding:40px 16px}}.board-notice{position:absolute;bottom:12px;left:12px;z-index:16;max-width:calc(100% - 24px);padding:8px 12px;border:1px solid var(--line);background:#f7f8f1;color:var(--muted);font-size:12px;border-radius:4px;pointer-events:none}.text-editor{position:absolute;inset:0;z-index:15;pointer-events:none}.text-editor textarea{position:absolute;transform-origin:0 0;pointer-events:auto;resize:none;background:#fff;border:1px solid var(--accent);border-radius:3px;box-shadow:0 0 0 2px #285c4926;margin:0;box-sizing:border-box;outline:none;white-space:pre-wrap;overflow:auto}.text-edit-controls{position:absolute;left:12px;top:12px;right:12px;z-index:1;display:flex;align-items:center;gap:8px;flex-wrap:wrap;pointer-events:auto;background:#fff;border:1px solid var(--line);border-radius:4px;padding:10px;box-shadow:0 4px 18px #26342414}.text-edit-controls label{display:flex;align-items:center;gap:6px;font-size:12px}.text-edit-controls input[type=color]{width:36px;height:34px;padding:3px}.text-edit-controls input[type=number],.selection-toolbar .font-size{width:68px;padding:6px}.text-edit-controls button{font-size:12px}.text-edit-controls small{color:var(--muted)}.toolbar button,.selection-toolbar button{display:inline-flex;align-items:center;gap:6px}.toolbar svg,.selection-toolbar svg{flex-shrink:0}.solid-picker{display:flex;align-items:center;gap:6px;padding-left:10px;border-left:1px solid var(--line);flex-wrap:wrap}.function-editor{display:flex;flex-wrap:wrap;align-items:center;max-width:none;background:#fff;padding:10px 16px;border-bottom:1px solid var(--line)}.function-editor label{display:flex;align-items:center;gap:6px;min-width:0;max-width:100%;flex-wrap:wrap}.function-editor input{width:240px;max-width:100%}.function-editor small{color:var(--muted)}.canvas-loading{position:absolute;inset:0;background:#fafbf8ed;display:grid;place-items:center;z-index:10}.canvas-busy{position:absolute;right:20px;bottom:20px;background:#fff;border:1px solid var(--line);border-radius:5px;box-shadow:0 4px 22px #2634241c;pointer-events:none;z-index:11}.editor .function-editor{flex-direction:row}.function-editor small{flex-basis:100%}.function-editor button{font-size:12px;padding:7px 10px}.board-context-panel{position:absolute;top:12px;left:12px;z-index:8;width:max-content;max-width:min(680px,calc(100% - 24px));max-height:calc(100% - 24px);overflow:auto;overscroll-behavior:contain;touch-action:pan-y;background:var(--surface);border:1px solid var(--line);border-radius:4px;box-shadow:0 3px 12px #26342414}.selection-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:8px;padding:8px 10px}.selection-toolbar label{display:flex;align-items:center;gap:5px;font-size:12px}.selection-toolbar button{font-size:12px;padding:6px 8px}.selection-toolbar input[type=color]{width:33px;height:33px;padding:3px}.selection-toolbar input[type=range]{width:80px;padding:0}.board-context-panel .function-editor{border-top:1px solid var(--line);border-bottom:0;padding:10px}.editor{height:100dvh;display:flex;flex-direction:column;background:#fafbf8}.editor header{display:flex;align-items:center;gap:15px;padding:8px 12px;background:#fff;border-bottom:1px solid var(--line)}.board-name{font-weight:600;flex:1;min-width:100px;border:0;font-size:14px}.status{font-size:11px;white-space:nowrap;color:#9a6f17}.status.online{color:var(--accent)}.toolbar{display:flex;flex-direction:column;align-items:stretch;background:var(--surface);border-bottom:1px solid var(--line)}.toolbar-row{display:flex;align-items:center;flex-wrap:wrap;gap:5px;padding:6px 12px}.toolbar-row+.toolbar-row{border-top:1px solid #edf0e9}.toolbar button{border-color:transparent;background:transparent}.toolbar button:hover:not(:disabled){border-color:var(--line)}.toolbar button.active{color:#214b3b;background:var(--accent-soft);border-color:#bdcdb8}.selection-label{font-size:11px;color:var(--muted);padding-right:10px}.toolbar button,.toolbar select{font-size:12px;padding:6px 8px}.toolbar input[type=color]{width:33px;height:33px;padding:3px}.toolbar input[type=range]{width:80px;padding:0;accent-color:var(--accent)}.toolbar label{font-size:12px;display:flex;align-items:center;gap:5px}.canvas-host{flex:1;min-height:0;overflow:hidden;touch-action:none;overscroll-behavior:none;position:relative}.editor footer{font-size:11px;color:var(--muted);padding:7px 18px;background:#fff;border-top:1px solid var(--line)}.editor input:focus{outline-offset:0}@media(max-width:600px){.editor header{padding:8px;gap:5px}.toolbar-row{padding:4px 8px;gap:3px}.status{font-size:10px}}:root{font-family:Segoe UI,system-ui,-apple-system,sans-serif;color:#252b27;background:#fafbf8;font-synthesis:none;font-weight:400;font-size:14px;line-height:1.5;--surface: #fff;--surface-muted: #f3f4f0;--line: #dce0d8;--text: #252b27;--muted: #677166;--accent: #285c49;--accent-soft: #e5eee7}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button{cursor:pointer;border:1px solid var(--line);border-radius:4px;padding:7px 12px;background:var(--surface);color:var(--text);transition:background .12s,border-color .12s}button:hover:not(:disabled){background:#edf0e9;border-color:#bfc8ba}button:disabled{opacity:.5;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}input,select,textarea{border:1px solid var(--line);border-radius:4px;padding:8px 10px;background:#fff;color:var(--text)}input[type=checkbox],input[type=range]{accent-color:var(--accent)}button.primary{background:var(--accent);color:#fff;border-color:var(--accent)}button.primary:hover:not(:disabled){background:#204a3b;border-color:#204a3b}button.active{background:var(--accent-soft);color:#214b3b;border-color:#bdd0c1}form{display:flex;gap:10px}form input{flex:1;min-width:0}h1{font-size:27px;font-weight:600;letter-spacing:-.035em;line-height:1.2;margin:0}h2{font-size:15px;font-weight:600;margin:0}.muted{color:var(--muted);font-size:13px}.error{font-size:13px;color:#8b2638;background:#fff3f2;border:1px solid #eccac9;padding:10px 16px;margin:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(prefers-reduced-motion:reduce){button{transition:none}}