@import "https://fonts.googleapis.com/css2?family=Golos+Text:wght@400;450;500;550;600;650;700;750&display=swap";:root{--ink:#263e52;--muted:#8b9aa7;--teal:#198e89;--line:#e6edf0;--blue:#347ca8;color:var(--ink);font-synthesis:none;font-family:Golos Text,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit;background:0 0;border:0;justify-content:center;align-items:center;gap:8px;transition:background .15s,color .15s,box-shadow .15s;display:inline-flex}button:disabled{opacity:.35;cursor:not-allowed}button:hover:not(:disabled){color:var(--teal)}button:focus-visible,a:focus-visible{outline-offset:3px;outline:3px solid #88d5ce}a{color:inherit;text-decoration:none}input,textarea,select{color:var(--ink);background:#fff;border:1px solid #dce6ea;border-radius:9px;outline:none;padding:11px 12px}input:focus,textarea:focus,select:focus{border-color:#51aba4;box-shadow:0 0 0 3px #eaf7f4}textarea{resize:vertical;width:100%;line-height:1.6}input{min-width:0}button svg{flex-shrink:0}.app-shell{background:#fafcfd;height:100dvh;min-height:580px;overflow:hidden}.topbar{border-bottom:1px solid var(--line);z-index:4;background:#fff;align-items:center;gap:24px;height:85px;padding:0 28px;display:flex;position:relative}.brand{align-items:center;gap:10px;min-width:146px;display:flex}.brand b{letter-spacing:-1.4px;font-size:28px;font-weight:650}.brand b span{color:#199d92}.brand-mark{color:#fff;background:#218d89;border-radius:11px;justify-content:center;align-items:center;width:34px;height:36px;display:flex;transform:rotate(-4deg)}.brand-mark svg{transform:rotate(4deg)}.header-divider{background:var(--line);width:1px;height:31px;margin:0 1px}.board-heading>div{color:#9ba7b1;align-items:center;gap:7px;margin-bottom:7px;font-size:12px;display:flex}.board-heading .crumb{color:#8a99a4}.board-heading>button{gap:18px;padding:0;font-size:16px;font-weight:550}.top-spacer{flex:1}.save-state{color:#8a9c9f;white-space:nowrap;align-items:center;gap:6px;font-size:12px;display:flex}.save-state svg{color:#50a594}.save-state.offline{color:#aa926a}.avatars{margin-left:0;display:flex}.avatar{background:#ecf0f6;border:3px solid #fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:33px;height:33px;font-size:14px;font-weight:600;display:inline-flex}.avatars .avatar+.avatar{margin-left:-7px}.avatar.teacher{color:#6d71a9;background:#e7eafa}.avatar.student{color:#408c7c;background:#dbf1e9}.primary{color:#fff;background:#218f8b;border:1px solid #0000;border-radius:8px;min-height:39px;padding:11px 16px;font-size:14px;font-weight:500}.primary:hover:not(:disabled){color:#fff;background:#137a76;box-shadow:0 3px 10px #15827e20}.share{gap:9px;padding:10px 15px}.workspace{height:calc(100dvh - 85px);min-height:495px;display:flex}.tools{border-right:1px solid var(--line);z-index:3;background:#fff;flex-direction:column;flex-shrink:0;align-items:center;width:76px;padding:20px 0 13px;display:flex}.tool-stack{flex-direction:column;align-items:center;gap:3px;display:flex}.tool{color:#677e90;border-radius:9px;width:44px;height:40px;position:relative}.tool.active{color:#218e88;background:#e5f3f1}.tool:hover{background:#f1f6f8}.shortcut-mini{opacity:0;font-size:9px;font-weight:500;position:absolute;bottom:4px;right:5px}.tool:hover .shortcut-mini,.tool.active .shortcut-mini{opacity:.65}.tool-divider{background:var(--line);width:25px;height:1px;margin:8px 0}.lower-tool{margin-top:auto}.board-area{background:#f9fbfc;flex:1;min-width:0;position:relative;overflow:hidden}.canvas{touch-action:none;-webkit-user-select:none;user-select:none;width:100%;height:100%;display:block}.board-top{z-index:1;pointer-events:none;justify-content:space-between;align-items:center;display:flex;position:absolute;top:22px;left:26px;right:26px}.board-top>*{pointer-events:auto}.subject-tag{color:#728a9a;background:#fff;border:1px solid #e8eef0;border-radius:7px;align-items:center;gap:8px;padding:9px 12px;font-size:12px;display:flex;box-shadow:0 2px 6px #29485803}.little-dot{background:#41b5a7;border-radius:50%;width:6px;height:6px;display:inline-block}.subject-sep{background:#e3ebef;width:1px;height:12px;margin:0 2px}.timer{color:#698493;background:#ffffffdc;border:1px solid #e5ecef;border-radius:7px;padding:9px 10px;font-size:13px}.timer span:last-child{color:#9aa7b1;border-left:1px solid #e1e8ed;padding-left:8px;font-size:12px}.timer-dot{background:#a4b5bc;border-radius:50%;width:6px;height:6px}.timer.running .timer-dot{background:#25b699}.floating-options{z-index:2;white-space:nowrap;opacity:0;background:#fff;border:1px solid #e4eaee;border-radius:10px;align-items:center;gap:10px;min-height:41px;padding:7px 12px;transition:opacity .15s;display:flex;position:absolute;top:76px;left:50%;transform:translate(-50%);box-shadow:0 4px 15px #294e6906}.board-area:focus-within .floating-options,.board-area:hover .floating-options{opacity:1}.options-label{color:#8193a0;font-size:12px}.vertical-line{background:#e4eaee;width:1px;height:17px;margin:0 2px}.swatch{outline:1px solid #0000;flex-shrink:0;border:3px solid #fff!important;border-radius:50%!important;width:17px!important;height:17px!important;min-height:0!important;padding:0!important}.swatch.chosen{outline-color:#98acb6}.stroke-button{gap:7px;padding:0;font-size:12px}.stroke-button>span{background:#6b8190;border-radius:3px;width:13px}.icon-button{color:#91a2ad;border-radius:6px;min-width:28px;height:28px;padding:5px}.icon-button:hover{background:#f0f6f6}.bottom-left,.zoom-controls{background:#fff;border:1px solid #e0e8ed;border-radius:9px;align-items:center;padding:4px;display:flex;position:absolute;bottom:23px;box-shadow:0 3px 9px #294e6905}.bottom-left{left:25px}.bottom-left button,.zoom-controls button{color:#718899;min-width:31px;padding:7px;font-size:13px}.bottom-left>span,.zoom-controls>span{background:#e0e8ed;width:1px;height:17px;margin:0 3px}.zoom-controls{right:25px}.board-tip{color:#9babb5;white-space:nowrap;pointer-events:none;align-items:center;gap:6px;font-size:11px;display:flex;position:absolute;bottom:39px;left:50%;transform:translate(-50%)}.side-panel{border-left:1px solid var(--line);z-index:3;background:#fff;flex-direction:column;flex-shrink:0;width:294px;display:flex}.panel-heading{justify-content:space-between;align-items:center;height:69px;padding:0 23px;display:flex}.panel-heading h2{margin:0;font-size:16px;font-weight:550}.panel-tabs{border-bottom:1px solid var(--line);flex-shrink:0;gap:19px;height:36px;margin:0 22px;display:flex}.panel-tabs button{color:#97a5b0;padding:0 1px 12px;font-size:13px;position:relative}.panel-tabs button.active{color:#238c86;font-weight:550}.panel-tabs button.active:after{content:"";background:#258f88;height:2px;position:absolute;bottom:-1px;left:0;right:0}.panel-scroll{scrollbar-width:thin;scrollbar-color:#dae6ea transparent;flex:1;padding:23px 22px;overflow:auto}.section-title{align-items:center;gap:7px;display:flex}.section-title h3{margin:0;font-size:14px;font-weight:550}.section-title .icon-button{margin-left:auto}.muted{color:#97a5af}.small{font-size:12px;line-height:1.7}.panel-scroll>p{margin:7px 0 18px}.template-grid{grid-template-columns:1fr 1fr;gap:12px 10px;display:grid}.template-grid>button{text-align:left;border:1px solid #e2e9ee;border-radius:9px;flex-direction:column;align-items:flex-start;gap:0;padding:0 10px 12px;transition:transform .2s,box-shadow .2s;display:flex;overflow:hidden}.template-grid>button:hover{border-color:#b9d9d8;transform:translateY(-2px);box-shadow:0 5px 12px #23586d0a}.template-art{background:#fafcfc;justify-content:center;align-items:center;width:calc(100% + 20px);height:72px;margin-bottom:10px;margin-left:-10px;display:flex}.template-art svg{width:90px;height:58px}.template-art>svg.lucide{width:34px;height:34px}.graph-art{background:#f3f9f8}.geo-art{background:#f7f8fc}.formula-art{color:#9a86b5;background:#faf8fc;font-family:Georgia;font-size:23px;font-style:italic}.template-grid strong{font-size:13px;font-weight:550;line-height:1.5}.template-grid button>span:last-child{color:#9ba9b2;margin-top:4px;font-size:11px}.notebook-title{margin-top:30px;margin-bottom:12px}.count{color:#9baab4;background:#f0f4f6;border-radius:4px;padding:2px 6px;font-size:11px}.empty-notebooks{text-align:center;color:#a1b6c1;border:1px dashed #dce7ec;border-radius:9px;flex-direction:column;align-items:center;gap:9px;padding:19px 8px;display:flex}.empty-notebooks strong{color:#708998;font-size:13px;font-weight:500}.empty-notebooks>span{color:#9cabb5;font-size:12px;line-height:1.7}.add-notebook{color:#7c929f;border:1px dashed #d5e2e7;border-radius:7px;width:100%;margin-top:10px;padding:11px;font-size:12px}.add-notebook:hover{background:#f2f9f8;border-color:#b0d7d1}.notebook-row{text-align:left;border-bottom:1px solid #f0f3f5;justify-content:flex-start;gap:11px;width:100%;padding:12px 0;display:flex}.notebook-row>span:nth-child(2){flex:1;min-width:0}.notebook-row strong{text-overflow:ellipsis;white-space:nowrap;max-width:162px;font-size:13px;font-weight:500;display:block;overflow:hidden}.notebook-row small{color:#a1afb8;margin-top:5px;font-size:11px;display:block}.book-icon{color:#6fa3c0;background:#eaf3f9;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;width:37px;height:42px;display:flex}.book-1{color:#7da894;background:#edf5ef}.lesson-card{background:#eff7f6;border:1px solid #e3efec;border-radius:10px;margin-top:28px;padding:19px;position:relative;overflow:hidden}.lesson-icon{color:#65a99b;width:20px;margin-bottom:15px;transform:rotate(-25deg)}.eyebrow{letter-spacing:1px;color:#91b4ac;font-size:9px;font-weight:550}.lesson-card h3{color:#477b72;margin:8px 0;font-size:16px;font-weight:500;line-height:1.5}.lesson-card p{color:#8ca9a2;margin:0;font-size:11px;line-height:1.8}.card-doodle{color:#83bab045;font-family:Georgia;font-size:62px;position:absolute;top:22px;right:14px;transform:rotate(12deg)}.card-doodle small{font-size:28px;position:absolute;top:62px;left:0}.panel-footer{color:#a5b3bc;border-top:1px solid #eff3f5;flex-shrink:0;align-items:center;gap:6px;height:45px;padding:10px 18px;font-size:10px;display:flex}.panel-footer .little-dot{width:4px;height:4px}.panel-footer button{width:20px;margin-left:auto;font-size:14px}.show-panel{border:1px solid var(--line);background:#fff;border-radius:8px;padding:10px;position:absolute;top:80px;right:20px}.student-card{border:1px solid #e1e9ed;border-radius:10px;margin-top:17px;padding:13px}.student-head{align-items:center;gap:7px;margin-bottom:18px;display:flex}.student-head>div{flex:1}.student-head b{font-size:13px}.student-head small{color:#97a8b3;margin-top:4px;font-size:11px;display:block}.student-card>label{letter-spacing:1px;color:#97a8b4;font-size:10px}.student-card>p{margin:6px 0 16px;font-size:13px;line-height:1.7}.homework{text-align:left;align-items:flex-start;padding:8px 0;font-size:12px;line-height:1.6}.homework>span{border:1px solid #cbdbdf;border-radius:4px;flex-shrink:0;width:16px;height:16px}.homework.done>span{color:#fff;background:#249b8c;border-color:#249b8c}.homework.done{color:#9aabae;text-decoration:line-through}.layer-row{border-radius:6px;align-items:center;margin:6px 0;display:flex}.layer-row.active{background:#edf6f4}.layer-row>button:first-child{color:#6e8796;flex:1;justify-content:flex-start;min-width:0;padding:10px 6px;font-size:12px}.layer-row span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.modal-backdrop{-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);z-index:30;background:#1d354243;justify-content:center;align-items:center;padding:25px;display:flex;position:fixed;inset:0}.modal{background:#fff;border:1px solid #eff4f6;border-radius:19px;width:490px;max-width:100%;max-height:90dvh;padding:34px;position:relative;overflow:auto;box-shadow:0 24px 100px #183e4530}.modal-close{position:absolute;top:14px;right:14px}.modal h2{letter-spacing:-.7px;margin:16px 0 11px;font-size:24px;font-weight:550;line-height:1.3}.modal>p{color:#899da9;margin:0 0 24px;font-size:14px;line-height:1.8}.modal-kicker{letter-spacing:1.4px;color:#55a49a;margin-top:8px;font-size:11px;font-weight:600;display:block}.modal-icon{color:#389b91;background:#ecf7f3;border-radius:13px;justify-content:center;align-items:center;width:48px;height:48px;display:flex}.modal label{color:#738d9b;margin:18px 0 9px;font-size:13px;display:block}.modal label input,.modal label textarea{width:100%;margin-top:8px;font-size:14px}.modal>input{width:100%;margin:10px 0 20px}.full{width:100%;margin-top:16px}.secondary{background:#fff;border:1px solid #dce8eb;border-radius:8px;padding:13px 16px;font-size:14px}.secondary:hover{background:#f2f9f7}.copy-field{gap:7px;display:flex}.copy-field input{background:#fafcfc;flex:1;font-size:12px}.info-box{color:#7090a4;background:#f1f6fa;border-radius:8px;gap:10px;margin-top:18px;padding:14px;font-size:12px;line-height:1.8;display:flex}.info-box svg{flex-shrink:0;margin-top:3px}.member-list{margin-top:22px}.member-list>div{align-items:center;gap:8px;padding:8px 0;font-size:13px;display:flex}.member-list small{color:#99aab5;margin-left:auto;font-size:11px}.keys-grid{grid-template-columns:1fr 1fr;gap:13px 28px;margin:25px 0;display:grid}.keys-grid>div{justify-content:space-between;align-items:center;font-size:13px;display:flex}kbd{color:#7c919f;white-space:nowrap;background:#f3f6f8;border:1px solid #e1e8eb;border-radius:4px;padding:4px 7px;font:10px Golos Text,sans-serif}.upload-zone{color:#69a69c;background:#f6fbfa;border:1px dashed #a8d5ce;border-radius:11px;flex-direction:column;gap:13px;width:100%;padding:32px 15px;display:flex}.upload-zone b{color:#4d8e83;font-size:16px;font-weight:500}.upload-zone span{color:#97b3ad;font-size:12px}.or-divider{color:#aab7bd;align-items:center;gap:13px;margin:22px 0 2px;font-size:12px;display:flex}.or-divider:before,.or-divider:after{content:"";background:#e8eef0;flex:1;height:1px}.template-choices{flex-direction:column;gap:10px;display:flex}.template-choices>button{text-align:left;border:1px solid #e2eaed;border-radius:10px;gap:14px;padding:13px}.template-choices>button:hover{background:#f6fbfa;border-color:#bcddd6}.choice-icon{color:#51a294;background:#edf7f4;border-radius:9px;justify-content:center;align-items:center;width:45px;height:45px;display:flex}.template-choices>button>span:nth-child(2){flex:1}.template-choices b{font-size:14px;font-weight:500;display:block}.template-choices small{color:#8fa4af;margin-top:6px;font-size:12px;display:block}.template-choices>button>svg{color:#8caaa9}.symbol-row{flex-wrap:wrap;gap:5px;margin:14px 0;display:flex}.symbol-row button{color:#698799;background:#f2f7f9;border-radius:5px;width:32px;height:31px}.coefficient-grid{gap:15px;display:flex}.coefficient-grid label{flex:1}.coefficient-grid input{width:100%}.toast{color:#fff;z-index:100;background:#254a4d;border-radius:10px;align-items:center;gap:9px;max-width:90vw;padding:14px 20px;font-size:14px;display:flex;position:fixed;bottom:25px;left:50%;transform:translate(-50%);box-shadow:0 5px 25px #153b4430}.demo-banner{color:#a08a65;z-index:4;background:#f7f1e5;border-radius:4px 4px 0 0;align-items:center;gap:7px;padding:4px 9px;font-size:11px;display:flex;position:fixed;bottom:0;left:78px}.notebook-overlay{-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);z-index:10;background:#2840511c;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:85px 0 0 76px}.notebook-window{background:#f0f4f6;border:1px solid #dce6ea;border-radius:14px;flex-direction:column;width:880px;max-width:95%;height:100%;display:flex;overflow:hidden;box-shadow:0 15px 70px #1e425d24}.notebook-window>header{background:#fff;flex-shrink:0;align-items:center;gap:12px;height:70px;padding:0 22px;display:flex}.notebook-window header b{font-size:16px;font-weight:500}.notebook-window header small{color:#9aabb6;margin-top:6px;font-size:12px;display:block}.notebook-toolbar{background:#fff;border-top:1px solid #f1f4f6;border-bottom:1px solid #dfe8ec;flex-shrink:0;align-items:center;gap:12px;padding:10px 22px;display:flex}.notebook-toolbar button{border-radius:5px;padding:6px;font-size:13px}.notebook-toolbar button.active{color:#248e80;background:#e7f5f0}.notebook-toolbar select{padding:7px;font-size:12px}.paper-scroll{flex:1;padding:28px;overflow:auto}.paper-canvas{background-color:#fff;background-repeat:no-repeat;background-size:100% 100%;width:740px;max-width:none;height:980px;margin:0 auto;box-shadow:0 2px 12px #25465c12}.notebook-window>footer{background:#fff;border-top:1px solid #dde8ed;flex-shrink:0;align-items:center;gap:14px;padding:12px 22px;font-size:13px;display:flex}.notebook-window>footer>span{color:#8ba0ae}.notebook-window>footer>button:last-child{color:#328e83;font-size:13px}.sign-in{justify-content:center;align-items:center;gap:10px;margin-top:15px;display:flex}@media (width>=1500px){.side-panel{width:320px}.panel-scroll{padding:25px}.panel-heading{padding:0 25px}.panel-tabs{margin:0 25px}.template-art{height:82px}.template-grid strong{font-size:14px}.template-grid button>span:last-child{font-size:12px}.lesson-card{padding:23px}.lesson-card h3{font-size:16px}}@media (height<=800px){.tools{padding-top:11px}.tool{height:34px}.tool-divider{margin:5px 0}.lesson-card{margin-top:20px}.panel-scroll{padding-top:18px}.template-art{height:60px}.notebook-title{margin-top:22px}.empty-notebooks{padding:14px 8px}.lesson-card p{display:none}.lesson-card{padding:14px}.lesson-icon{margin-bottom:9px}.board-tip{display:none}}@media (width<=1200px){.topbar{gap:17px;padding:0 20px}.save-state span{display:none}.side-panel{width:260px}.panel-scroll{padding-left:17px;padding-right:17px}.panel-tabs{gap:15px;margin:0 17px}.panel-heading{padding:0 17px}.board-tip{display:none}.brand{min-width:130px}.board-heading>button{font-size:14px}.board-heading>div{font-size:11px}.options-label{display:none}}@media (width<=850px){.side-panel{width:275px;position:absolute;top:70px;bottom:0;right:0;box-shadow:-10px 0 30px #1939520a}.topbar{gap:12px;height:70px;padding:0 14px}.brand{min-width:0}.brand b{font-size:23px}.brand-mark{width:29px;height:31px}.header-divider{display:none}.board-heading{margin-left:5px}.board-heading>div{display:none}.board-heading>button{text-overflow:ellipsis;white-space:nowrap;max-width:190px;overflow:hidden}.save-state,.avatars{display:none}.share{padding:10px;font-size:0}.share svg{width:18px}.workspace{height:calc(100dvh - 70px)}.tools{width:61px}.board-top{left:15px;right:15px}.floating-options{gap:7px;padding:7px}.timer span:last-child{display:none}.notebook-overlay{padding:10px;inset:70px 0 0 61px}.notebook-window{max-width:100%}.notebook-toolbar{gap:8px;padding:8px}.notebook-toolbar kbd{display:none}.notebook-window footer{gap:7px;padding:10px}.notebook-window footer button:last-child{font-size:11px}.notebook-window header{padding:0 14px}.notebook-window header small{display:none}.demo-banner{left:62px}}@media (width<=520px){.board-heading>button{max-width:145px;font-size:13px}.board-heading button svg,.brand b{display:none}.modal{padding:26px}.modal h2{font-size:22px}.keys-grid{gap:13px}.side-panel{width:250px}.subject-tag{padding:8px;font-size:10px}.timer{font-size:12px}.bottom-left{bottom:16px;left:12px}.zoom-controls{bottom:16px;right:12px}.notebook-toolbar button{gap:0;font-size:0}.notebook-toolbar select{max-width:100px}.notebook-toolbar .swatch{width:14px!important;height:14px!important}.notebook-window footer>span{font-size:11px}}.library-more{text-align:left;color:#7a93a4;border:1px solid #e2eaf0;border-radius:8px;gap:9px;width:100%;margin-top:11px;padding:12px 9px;font-size:12px}.library-more>span{flex:1}.library-more:hover{background:#eff8f5}.library-more>svg:first-child{color:#52a298}.library-total{color:#a0b1bb;text-align:center;margin-top:13px;font-size:10px}.account-access{color:#528e81;background:#f1f9f6;border:1px solid #cde5df;border-radius:8px;width:100%;margin-bottom:22px;padding:13px 8px;font-size:12px}.account-access>span{flex:1}.modal-templates{width:850px}.template-search{color:#91a6b1;background:#f7fafb;border:1px solid #e0eaed;border-radius:9px;align-items:center;margin-bottom:18px;padding-left:13px;display:flex}.template-search input{width:100%;box-shadow:none;background:0 0;border:0;font-size:14px}.library-tabs{flex-wrap:wrap;gap:7px;margin-bottom:20px;display:flex}.library-tabs button{color:#7a929e;background:#f4f7f9;border-radius:7px;padding:9px 12px;font-size:12px}.library-tabs button.active{color:#2a8f7f;background:#e5f4ed}.library-cards{grid-template-columns:repeat(3,1fr);gap:15px;max-height:52vh;padding:2px 4px 5px 0;display:grid;overflow:auto}.library-cards>button{text-align:left;border:1px solid #dfe9ed;border-radius:10px;flex-direction:column;align-items:flex-start;gap:5px;padding:8px 10px 14px;position:relative}.library-cards>button:hover{background:#f9fcfb;border-color:#98cdc0}.library-cards>button>svg{pointer-events:none;width:100%;height:130px;margin-bottom:8px}.library-cards strong{padding-right:15px;font-size:13px;font-weight:550}.library-cards small{color:#96a9b5;font-size:11px;line-height:1.6}.add-template-icon{color:#77aa9e;position:absolute;bottom:32px;right:10px}.modal-unit{width:490px}.unit-preview{width:100%;height:300px}.angle-presets{flex-wrap:wrap;gap:4px;display:flex}.angle-presets button{background:#edf5f8;border-radius:4px;padding:6px 8px;font-size:12px}.form-error{color:#b6795f;background:#fff2ed;border-radius:7px;margin-top:13px;padding:10px 12px;font-size:13px;line-height:1.6}.demo-link{color:#91a4b0;margin:22px auto 0;font-size:12px;display:block}.accounts-list>div{border-bottom:1px solid #edf2f4;align-items:center;gap:9px;padding:10px 0;display:flex}.accounts-list b{font-size:13px;font-weight:500}.accounts-list small{color:#99aab4;margin-top:4px;font-size:12px;display:block}.accounts-list button{color:#489d91;margin-left:auto;font-size:11px}.accounts-list{max-height:180px;overflow:auto}.modal-accounts h3{margin:24px 0 0;font-size:16px}.notebook-window footer select{color:#869daa;border:0;padding:4px;font-size:12px}.floating-options{opacity:1;top:auto;bottom:83px}.board-area:hover .floating-options{opacity:1}.modal-login h2{font-size:23px}.modal-login .modal-close{display:none}.user-exit{margin-left:-16px}.notebook-window footer{gap:8px}.canvas{overscroll-behavior:contain}@media (width<=700px){.library-cards{grid-template-columns:repeat(2,1fr)}.library-cards>button>svg{height:105px}.library-tabs button{padding:7px 9px;font-size:11px}.modal-templates{padding:23px}.library-cards{max-height:55vh}.floating-options{gap:6px;max-width:95%;bottom:75px}.floating-options .icon-button{min-width:22px;padding:3px}.user-exit{display:none}}.board-list{flex-direction:column;gap:7px;max-height:220px;display:flex;overflow:auto}.board-list>button{text-align:left;border:1px solid #e4ecee;border-radius:8px;justify-content:flex-start;padding:12px;font-size:14px}.board-list>button>svg:last-child{margin-left:auto}.board-list>button.active{color:#328e7e;background:#eef7f3;border-color:#cce3d9}.tools{scrollbar-width:none;gap:8px;width:78px;padding:10px 8px;overflow-y:auto}.tool-stack{grid-template-columns:repeat(2,29px);gap:4px;display:grid}.tool{border-radius:7px;width:29px;height:34px}.tool svg{width:17px;height:17px}.tool-divider{grid-column:1/-1;width:45px;margin:3px auto}.left-palette{border-top:1px solid #e2ebee;grid-template-columns:repeat(2,20px);justify-content:center;gap:10px;width:100%;margin-top:4px;padding-top:12px;display:grid}.left-palette .swatch{width:20px!important;height:20px!important}.left-palette>input[type=color]{border-radius:6px;grid-column:1/-1;width:50px;height:28px;padding:2px}.left-palette label{color:#8399a6;flex-direction:column;grid-column:1/-1;align-items:center;gap:5px;font-size:11px;display:flex}.left-palette input[type=range]{accent-color:#219b91;width:51px;min-width:0;height:20px;box-shadow:none;border:0;padding:0}.lower-tool{flex-shrink:0;width:42px;margin-top:auto}.exit-board{color:#839aa7;border-radius:8px;width:31px;height:31px;margin-right:-15px}.exit-board:hover{background:#edf6f5}.board-top{pointer-events:none}.object-inspector{z-index:5;scrollbar-width:thin;background:#fff;border:1px solid #dce8ec;border-radius:13px;width:280px;max-height:calc(100% - 145px);padding:16px;position:absolute;top:77px;right:16px;overflow:auto;box-shadow:0 10px 40px #254c6014}.inspector-heading{color:#3e6979;align-items:center;gap:8px;margin-bottom:12px;font-size:13px;display:flex}.inspector-heading strong{flex:1;font-weight:550}.inspector-heading button{color:#91a6b1;padding:3px}.inspector-actions{border-bottom:1px solid #edf2f4;align-items:center;gap:5px;padding-bottom:13px;display:flex}.inspector-actions>button{color:#7d95a3;background:#f3f7f8;border-radius:5px;padding:6px}.inspector-actions>span{color:#9fb0b9;margin-left:auto;font-size:10px}.object-inspector fieldset{border:0;min-width:0;margin:0;padding:0}.object-inspector label{color:#7d96a5;margin:15px 0 9px;font-size:12px;line-height:1.6;display:block}.object-inspector textarea,.object-inspector input:not([type=range]){width:100%;margin-top:6px;padding:9px;font-size:13px;display:block}.object-inspector textarea{font-family:ui-monospace,SFMono-Regular,monospace;line-height:1.8}.object-inspector input[type=range]{accent-color:#229b91;width:100%;box-shadow:none;border:0;margin:9px 0 0;padding:0}.inspector-help{color:#9aaeb9;margin:8px 0;font-size:11px;line-height:1.7}.inspector-help code{color:#368f89;background:#eff7f5;border-radius:3px;padding:1px 3px}.dimension-fields{grid-template-columns:1fr 1fr;gap:10px;display:grid}.expression-error{color:#b8755b;background:#fff2ed;border-radius:6px;padding:9px;font-size:12px;line-height:1.6}.trig-values{grid-template-columns:1fr 1fr;gap:8px;margin:13px 0;display:grid}.trig-values>div{background:#f1f8f6;border-radius:7px;flex-direction:column;gap:5px;padding:9px 10px;display:flex}.trig-values span{color:#82a59c;font-size:12px}.trig-values b{color:#3b8b7a;font-size:15px;font-weight:500}.object-inspector details{border-top:1px solid #e5edf0;margin-top:15px;padding-top:13px}.object-inspector summary{color:#6f929d;cursor:pointer;font-size:13px}.label-fields{grid-template-columns:1fr 1fr;gap:0 9px;display:grid}.label-fields label{margin:7px 0}.workspace-hidden{display:none!important}.boards-home{background:radial-gradient(circle at 80% 10%,#e6f5f1 0,#0000 35%),#f7fafb;height:calc(100dvh - 85px);padding:55px max(30px,8vw);overflow:auto}.home-heading h1{letter-spacing:-1px;margin:14px 0;font-size:32px;font-weight:550}.home-heading p{color:#92a7b1;font-size:15px;line-height:1.7}.new-board-form{gap:12px;max-width:600px;margin:30px 0;display:flex}.new-board-form input{background:#fff;flex:1}.home-board-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px;margin:30px 0;display:grid}.home-board-grid>button{text-align:left;background:#fff;border:1px solid #dfeaec;border-radius:12px;flex-direction:column;align-items:flex-start;gap:20px;min-height:170px;padding:25px;display:flex}.home-board-grid>button>svg{color:#56a79a}.home-board-grid strong{font-size:16px;font-weight:500}.home-board-grid span{color:#91a7b2;align-items:center;gap:10px;font-size:13px;display:flex}.home-board-grid>button:hover{border-color:#9bccbd;box-shadow:0 8px 22px #1e67500a}.notebook-workspace{background:#edf3f5;flex-direction:column;display:flex;position:absolute;inset:0}.ribbon-toolbar{z-index:3;flex-shrink:0;gap:15px;min-height:59px;padding:10px 20px}.ribbon-toolbar input{border-color:#0000;max-width:250px;padding:7px 8px;font-size:14px;font-weight:500}.ribbon-toolbar>button{white-space:nowrap;font-size:13px}.ribbon-toolbar>span{color:#8ea7b4;margin-left:auto;font-size:12px}.notebook-ribbon{scrollbar-width:thin;flex:1;padding:22px max(28px,50% - 390px) 100px;scroll-padding-top:15px;overflow:auto}.page-caption{color:#91a6b2;align-items:center;gap:10px;width:740px;margin:8px 0 11px;font-size:12px;display:flex}.page-caption select{background:#f9fcfc;margin-left:auto;padding:5px 8px;font-size:12px}.page-caption button{padding:5px 6px;font-size:12px}.ribbon-page{border:1px solid #0000;width:740px;height:980px;scroll-margin-top:48px;position:relative}.ribbon-page.current{border-color:#7ebfae;box-shadow:0 0 0 3px #cde7df55}.paper-sheet{background:#fff 0 0/100% 100% no-repeat;width:740px;height:980px;position:relative;box-shadow:0 3px 15px #2b516910}.paper-canvas{box-shadow:none;background:0 0;width:740px;height:980px}.insert-page-between{color:#82a599;width:740px;margin:17px 0 25px;padding:9px;font-size:12px;position:relative}.insert-page-between:before,.insert-page-between:after{content:"";background:#cfdfdf;flex:1;height:1px;margin:0 15px}.pdf-loading{color:#a1b2bb;pointer-events:none;font-size:13px;position:absolute;top:25px;left:20px}.notebook-active>.board-top,.notebook-active>.zoom-controls,.notebook-active>.board-tip{display:none}.notebook-active>.bottom-left{z-index:4;bottom:15px}.notebook-active>.object-inspector{top:77px;right:12px}.notebook-active>.show-panel{z-index:3;top:67px}.board-area>.object-inspector+*{pointer-events:auto}.floating-options{display:none!important}@media (width<=1000px){.object-inspector{width:255px;right:10px}.topbar{gap:12px}.brand{min-width:120px}.ribbon-toolbar{gap:8px;padding:9px 12px}.ribbon-toolbar input{max-width:170px}.notebook-ribbon{padding-left:25px;padding-right:25px}}@media (width<=700px){.object-inspector{width:min(310px,100% - 24px);max-height:47%;font-size:13px;top:auto;bottom:75px}.tools{width:65px;padding:9px 4px}.tool-stack{grid-template-columns:repeat(2,26px);gap:2px}.tool{width:26px;height:32px}.left-palette{gap:8px}.topbar .brand{min-width:0}.exit-board{margin-right:-5px}.ribbon-toolbar>button{font-size:12px}.ribbon-toolbar input{width:110px;max-width:110px}.ribbon-toolbar>span{display:none}.boards-home{height:calc(100dvh - 70px);padding:30px 20px}.home-heading h1{font-size:25px}.new-board-form{flex-direction:column}.notebook-active>.object-inspector{max-height:45%;top:auto;bottom:65px}}.object-inspector{width:316px;font-size:14px}.inspector-heading strong{font-size:15px}.inspector-help{font-size:13px;line-height:1.6}.object-inspector h3{margin:16px 0 8px;font-size:15px}.object-inspector input,.object-inspector textarea,.object-inspector select{font-size:14px}.geometry-value{align-items:center;gap:10px;display:flex}.geometry-value input[type=number]{width:76px;padding:7px}.geometry-value input[type=range]{flex:1;min-width:0;padding:0}.geometry-controls{border-bottom:1px solid #e3ecef;padding-bottom:12px}.stroke-style-picker{flex-direction:column;grid-column:1/-1;gap:3px;width:100%;display:flex}.stroke-style-picker button{border:1px solid #e3ecef;border-radius:5px;min-height:23px;padding:0 4px;font-size:14px;line-height:1.2}.stroke-style-picker button[aria-pressed=true]{color:#187e75;background:#e3f4f0;border-color:#6eb9ad}.left-palette{gap:8px}.tools{scrollbar-width:thin;overflow-y:auto}.lower-tool{flex-shrink:0}.probe-values{background:#eef7f7;border-radius:8px;flex-direction:column;gap:7px;padding:12px;font-size:15px;display:flex}.probe-values button{color:#478b92;font-size:13px}.canvas [data-hit=text]{cursor:move}.canvas text{-webkit-user-select:none;user-select:none}.object-inspector select{width:100%;max-width:100%}@media (width<=700px){.object-inspector{width:min(316px,100% - 24px)}.side-panel{width:300px}.tools{width:76px}.stroke-style-picker button{font-size:13px}}.board-top{justify-content:flex-end;top:14px}.object-inspector{width:292px;max-height:calc(100% - 128px);padding:12px;top:68px;right:12px}.object-inspector label{margin:10px 0 5px;font-size:13px}.object-inspector input:not([type=range]),.object-inspector textarea,.object-inspector select{margin-top:3px;padding:7px}.inspector-heading{margin-bottom:8px}.inspector-actions{padding-bottom:8px}.object-inspector .inspector-help{font-size:12px;line-height:1.5}.object-inspector details{margin-top:10px;padding-top:10px}.geometry-controls{padding-bottom:6px}.geometry-value{gap:8px}.geometry-value input[type=number]{width:76px}.object-inspector .angle-presets{gap:4px}.side-panel{width:292px}.panel-heading{height:54px;padding:0 15px}.panel-tabs{margin:0 15px}.panel-scroll{padding:16px 15px}.simulation-buttons{gap:8px;margin:12px 0;display:flex}.simulation-buttons button{flex:1;padding:8px}.stroke-style-picker{width:48px;margin:auto;overflow:hidden}.stroke-style-picker button{width:48px;min-width:0;height:24px;padding:0;overflow:hidden}.stroke-style-picker svg{width:38px;max-width:100%;height:12px}.background-choices{grid-template-columns:1fr 1fr;gap:10px;margin:20px 0;display:grid}.background-choices button{text-align:left;border:1px solid #dce7e9;border-radius:8px;justify-content:flex-start;padding:9px;font-size:14px}.background-choices button[aria-pressed=true]{border-color:#248e87;box-shadow:0 0 0 2px #218f8b25}.background-choices span{border:1px solid #9faeaf;border-radius:5px;flex-shrink:0;width:30px;height:30px}.modal select{width:100%}.axis-number{paint-order:stroke;stroke:var(--paper-color,#fff);stroke-width:3px;stroke-linejoin:round}.tool-stack{gap:2px}.tool-divider{margin:4px 0}.left-palette{padding-top:9px}.geometry-controls h3{margin-top:10px}.library-cards>button>svg{overflow:hidden}.board-tip{display:none}@media (width<=700px){.object-inspector{width:min(292px,100% - 20px);max-height:45%;top:auto;bottom:65px}.side-panel{width:min(292px,100vw - 76px)}}.board-top{right:70px}.board-area>.show-panel{z-index:6;top:14px;right:14px}.notebook-active>.show-panel{top:66px}.notebook-active>.object-inspector{max-height:calc(100% - 172px);top:116px}.inspector-heading strong{min-width:0;line-height:1.35}.inspector-heading>svg{flex-shrink:0}.multi-selection{z-index:14;background:#fff;border:1px solid #c9dfe7;border-radius:12px;align-items:center;gap:12px;padding:10px 14px;display:flex;position:absolute;top:68px;left:24px;box-shadow:0 8px 25px #254f6614}.multi-selection button{color:#296a89;align-items:center;gap:6px;font-size:14px;display:flex}.export-region-backdrop{-webkit-backdrop-filter:none;backdrop-filter:none;pointer-events:none;background:0 0;justify-content:flex-end;align-items:flex-end;padding:24px}.export-region-backdrop .modal{pointer-events:auto;border:1px solid #c7dce5;width:320px;box-shadow:0 12px 50px #183f5933}.lesson-control{position:relative}.lesson-panel{color:#294458;z-index:40;background:#fff;border:1px solid #d5e4e8;border-radius:16px;width:340px;max-height:calc(100vh - 180px);padding:20px;position:absolute;top:48px;right:0;overflow:auto;box-shadow:0 14px 45px #23455625}.lesson-panel header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.lesson-panel header button{font-size:24px}.lesson-panel label{margin:12px 0;font-size:14px;font-weight:500;display:block}.lesson-panel input:not([type=checkbox]),.lesson-panel textarea{border:1px solid #d4e2e9;border-radius:7px;width:100%;margin-top:6px;padding:9px;font-size:14px;display:block}.lesson-panel .lesson-check{align-items:center;gap:8px;display:flex}.lesson-panel progress{accent-color:#209b97;width:100%;height:7px}.lesson-panel p,.lesson-panel small{color:#68808f;font-size:12px;line-height:1.5}.lesson-actions{gap:8px;margin:16px 0;display:flex}.lesson-panel small{display:block}.board-top:has(.lesson-panel){z-index:35}.angle-presets button small{opacity:.7;font-size:10px;display:block}.axis-number{stroke:#f8fbfd!important}@media (width<=600px){.lesson-panel{width:290px}.multi-selection{flex-wrap:wrap;max-width:90%}.export-region-backdrop{padding:8px}}.pendulum-formulas{color:#28566b;background:#eef7f9;border:1px solid #d1e9ec;border-radius:10px;margin:10px 0;padding:12px;font-size:13px;line-height:1.5}.pendulum-formulas p{margin:6px 0}.pendulum-formulas small{color:#587682;margin:6px 0;font-size:11px;display:block}.eraser-settings{z-index:20;background:#fff;border:1px solid #c9dfe7;border-radius:12px;width:250px;padding:14px;position:absolute;top:18px;left:16px;box-shadow:0 6px 25px #254f6614}.eraser-settings label{margin:8px 0;font-size:13px;display:block}.eraser-settings select,.eraser-settings input{width:100%}.eraser-settings small{color:#638191;font-size:11px;line-height:1.4;display:block}.auth-page{color:#233b55;background:radial-gradient(at 15% 30%,#d9f4ef,#0000 55%),#f3f8fb;justify-content:center;align-items:center;gap:8vw;min-height:100dvh;padding:40px;display:flex}.auth-intro{max-width:550px}.auth-brand{font-size:33px;font-weight:700}.auth-intro h1{letter-spacing:-2px;margin:44px 0 22px;font-size:clamp(38px,5vw,68px);line-height:1.12}.auth-intro h1 em{color:#268f91;font-style:normal}.auth-intro p{color:#65818f;font-size:18px;line-height:1.8}.auth-equation{color:#458d99;padding-top:40px;font-size:26px}.auth-equation span{margin:0 15px}.auth-card{background:#fff;border:1px solid #dfebef;border-radius:24px;width:430px;padding:36px;box-shadow:0 20px 70px #376b8010}.auth-card h2{margin:14px 0;font-size:28px}.auth-card p{color:#67808c;line-height:1.6}.auth-card label{margin:20px 0 0;font-size:15px;display:block}.auth-card input{width:100%;margin-top:8px;padding:13px;font-size:16px}.auth-card .primary{margin-top:25px;padding:14px;font-size:16px}.auth-links{justify-content:space-between;gap:12px;margin:23px 0;display:flex}.auth-links button{color:#24868c;font-size:14px}.auth-card small{color:#859aa7;font-size:12px;line-height:1.6;display:block}.auth-notice{background:#e9f7ef;border-radius:8px;padding:12px}@media (width<=850px){.auth-intro{display:none}.auth-page{padding:20px}.auth-card{max-width:100%;padding:26px}}.board-top .presence-control,.board-top .board-background-button{pointer-events:auto}.presence-control{position:relative}.presence-control>.secondary,.board-background-button{background:#fff;padding:9px 12px;font-size:13px}.presence-menu{z-index:15;background:#fff;border:1px solid #dce8ec;border-radius:12px;width:300px;max-height:60vh;padding:16px;position:absolute;top:45px;left:0;overflow:auto;box-shadow:0 8px 30px #23445520}.presence-menu p{color:#657f90;font-size:13px;line-height:1.5}.presence-menu>div{border-top:1px solid #e5edef;flex-wrap:wrap;gap:8px;padding:12px 0;display:flex}.presence-menu b{flex:1}.presence-menu small{color:#708a95}.presence-menu button{color:#237c75;background:#edf7f5;border-radius:6px;padding:7px 11px}.presence-menu button:disabled{opacity:.4;cursor:default}.background-choices{flex-wrap:wrap;gap:9px;display:flex}.background-choices button{border:1px solid #dce8ec;border-radius:8px;gap:7px;padding:10px}.background-choices button[aria-pressed=true]{background:#eef9f6;border-color:#219b91}.background-choices span{border:1px solid #cbd6dc;border-radius:50%;width:20px;height:20px}.board-top{z-index:8;flex-wrap:wrap;gap:10px}.topbar .presence-control{z-index:20}.topbar .presence-menu{width:min(300px,90vw);left:auto;right:0}@media (width<=650px){.topbar .presence-control>.secondary{padding:8px 5px;font-size:11px}.topbar .board-heading>button{max-width:100px}.topbar{gap:7px}.topbar .brand{min-width:0}}.element-workbench{z-index:9;position:absolute;top:14px;left:18px}.element-workbench>.secondary{background:#fff;padding:9px 12px;font-size:13px}.workbench-menu{background:#fff;border:1px solid #d8e6eb;border-radius:12px;width:min(340px,100vw - 105px);max-height:calc(100dvh - 240px);padding:16px;position:absolute;top:45px;left:0;overflow:auto;box-shadow:0 12px 35px #23445525}.workbench-menu header{justify-content:space-between;align-items:center;display:flex}.workbench-menu header button{font-size:24px}.workbench-menu p,.workbench-menu small{color:#708895;font-size:12px;line-height:1.6}.workbench-menu h4{margin:18px 0 10px;font-size:14px}.workbench-actions{flex-wrap:wrap;gap:6px;display:flex}.workbench-actions button,.workbench-menu form button{color:#237b75;background:#edf7f5;border-radius:6px;padding:8px 10px;font-size:12px}.workbench-menu button:disabled{opacity:.4;cursor:default}.kit-list>button,.kit-list>div{border-bottom:1px solid #e7eef1;width:100%;display:flex}.kit-list button{text-align:left;justify-content:space-between;gap:12px;padding:10px 0;font-size:13px}.kit-list>div>button:first-child{flex:1}.kit-list>div>button:last-child{padding:10px}.kit-list span{color:#219b91}.workbench-menu input{width:100%;margin-bottom:8px;font-size:13px}.workbench-menu small{margin-top:14px;display:block}.notebook-active>.element-workbench{top:auto;bottom:67px}.notebook-active .workbench-menu{top:auto;bottom:45px}.board-top{left:230px}.multi-selection{flex-wrap:wrap;max-width:calc(100% - 30px)}@media (width<=700px){.element-workbench{top:64px;left:12px}.board-top{left:12px}.workbench-menu{max-height:calc(100dvh - 290px)}}.canvas{-webkit-user-select:none;-webkit-touch-callout:none}.notebook-ribbon{--notebook-zoom:1;overscroll-behavior:contain}.notebook-ribbon .ribbon-page{width:calc(740px * var(--notebook-zoom));height:calc(980px * var(--notebook-zoom));flex-shrink:0}.notebook-ribbon .paper-sheet{transform:scale(var(--notebook-zoom));transform-origin:0 0}.notebook-ribbon .page-caption,.notebook-ribbon .insert-page-between{width:calc(740px * var(--notebook-zoom))}.guest-status{color:#367d78;white-space:nowrap;background:#e8f5f1;border-radius:6px;padding:6px 9px;font-size:12px}.compact-tools .tool-stack{flex-direction:column;gap:8px;display:flex}.compact-tools .tool{width:44px;height:42px}.compact-tools .left-palette{margin-top:20px}