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--tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}.auth-page{background:radial-gradient(circle at 20% 20%,#ffe8dd,#0000 32%),radial-gradient(circle at 80% 80%,#dff2ff,#0000 32%),#f8f9fd;place-items:center;min-height:100vh;padding:90px 20px;display:grid}.auth-brand{color:var(--ink);align-items:center;gap:10px;text-decoration:none;display:flex;position:absolute;top:28px;left:32px}.auth-brand span{background:var(--orange);color:#fff;border-radius:13px;place-items:center;width:38px;height:38px;font-weight:900;display:grid}.auth-card{background:#ffffffec;border:1px solid #fff;border-radius:24px;width:min(430px,100%);padding:30px;box-shadow:0 24px 70px #27314218}.auth-tabs{background:#f1f3f7;border-radius:13px;grid-template-columns:1fr 1fr;padding:4px;display:grid}.auth-tabs button{color:#8991a0;background:0 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1fr;align-items:center;height:66px;padding:0 22px;display:grid}.player-bar>a,.player-actions a{color:#667085;font-size:13px;text-decoration:none}.player-bar>div:nth-child(2){text-align:center}.player-bar b,.player-bar small{display:block}.player-bar small{color:#9aa2af;margin-top:3px;font-size:10px}.player-actions{justify-content:flex-end;gap:8px;display:flex}.player-actions button,.player-actions a{border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 12px}.player-actions .on{color:#ff604d;background:#fff0ec}.player-actions .wrong-on{color:#fff;background:#ff604d}.html-stage{place-items:center;min-height:calc(100vh - 112px);padding:30px;display:grid}.demo-note{background:#fffdf9;border-radius:26px;width:min(900px,100%);padding:48px;box-shadow:0 18px 60px #2a344319}.note-tag{color:#ef6338;background:#ffdfd2;border-radius:10px;padding:6px 11px;font-size:11px;font-weight:800}.demo-note h1{margin:18px 0 8px;font-size:31px}.demo-note>p{color:#667085}.formula-card{text-align:center;background:#eef6ff;border:2px solid #8bbaf8;border-radius:18px;margin:24px 0;padding:22px}.formula-card strong{font:600 20px Georgia,serif}.formula-card p{color:#49698f;margin-bottom:0}.three-notes{grid-template-columns:repeat(3,1fr);gap:13px;display:grid}.three-notes article{color:#41688f;background:#eef6ff;border-radius:14px;padding:16px}.three-notes article:nth-child(2){color:#a44f48;background:#fff0ee}.three-notes article:nth-child(3){color:#387b61;background:#eaf9f1}.three-notes p{margin:7px 0 0;font-size:12px;line-height:1.65}.next-step{float:right;background:var(--orange);color:#fff;border:0;border-radius:12px;margin-top:24px;padding:12px 18px;font-weight:800}.player-footer{border-top:1px solid var(--line);color:#7e8795;background:#fff;align-items:center;gap:12px;height:46px;padding:0 24px;font-size:11px;display:flex}.player-footer>div{background:#edf0f5;border-radius:10px;flex:1;height:5px}.player-footer i{background:var(--orange);height:100%;display:block}.board-page{background:#e9edf2;flex-direction:column;height:100vh;display:flex}.board-page header{background:#fff;grid-template-columns:1fr auto 1fr;align-items:center;height:64px;padding:0 20px;display:grid}.board-page header>a{color:#667085;text-decoration:none}.board-page header>div{justify-content:flex-end;gap:9px;display:flex}.board-page header button{border:3px solid #fff;border-radius:50%;width:28px;height:28px;box-shadow:0 0 0 1px #d7dce4}.board-page header button.selected{box-shadow:0 0 0 3px #ffb59f}.board-page header .clear-board{border:1px solid var(--line);color:#687385;width:auto;box-shadow:none;background:#fff;border-radius:9px;padding:0 13px}.board-page canvas{touch-action:none;background:#fff;border-radius:16px;width:calc(100% - 28px);height:calc(100% - 108px);margin:14px;box-shadow:0 10px 35px #28314012}.board-page>p{text-align:center;color:#8c95a3;margin:0 0 10px;font-size:11px}.admin-page{background:#f5f7fb;grid-template-columns:230px 1fr;min-height:100vh;display:grid}.admin-page>aside{color:#fff;background:#202a3a;padding:24px 18px}.admin-page>aside>a{color:#fff;gap:10px;font-size:21px;font-weight:900;text-decoration:none;display:flex}.admin-page aside p{color:#778399;letter-spacing:2px;margin:30px 12px 8px;font-size:10px}.admin-page nav a{color:#b8c0cd;border-radius:10px;margin:3px 0;padding:11px 13px;font-size:13px;display:block}.admin-page nav a.active{color:#fff;background:#ff7043}.admin-page>section{padding:30px}.admin-page section>header{justify-content:space-between;align-items:center;display:flex}.admin-page h1{margin:0;font-size:24px}.admin-page header p,.panel-title p{color:#8b94a3;margin:5px 0;font-size:12px}.admin-page header a{color:#596374;background:#fff;border-radius:10px;padding:10px 14px;font-size:12px;text-decoration:none}.stat-grid{grid-template-columns:repeat(4,1fr);gap:15px;margin:25px 0;display:grid}.stat-grid article{border:1px solid var(--line);background:#fff;border-radius:16px;padding:20px}.stat-grid span,.stat-grid strong,.stat-grid small{display:block}.stat-grid span{color:#7d8695;font-size:12px}.stat-grid strong{margin:10px 0 5px;font-size:25px}.stat-grid small{color:#43a97b}.admin-panel{border:1px solid var(--line);background:#fff;border-radius:18px;padding:22px}.panel-title{justify-content:space-between;align-items:center;display:flex}.panel-title h2{margin:0;font-size:17px}.panel-title button{background:var(--orange);color:#fff;border:0;border-radius:10px;padding:10px 14px;font-size:12px;font-weight:800}.content-table{margin-top:18px}.table-row{border-top:1px solid var(--line);grid-template-columns:2fr .7fr 1fr .7fr;gap:12px;padding:14px 10px;font-size:12px;display:grid}.table-head{color:#8b94a3;background:#f7f8fb;border:0;font-weight:800}.status{border-radius:8px;width:max-content;padding:4px 8px}.status.已发布{color:#2a9866;background:#e8f8ef}.status.转换中{color:#3471c9;background:#e8f1ff}.status.草稿{color:#707987;background:#f0f1f3}@media (max-width:760px){.auth-brand{left:18px}.player-bar{grid-template-columns:auto 1fr}.player-bar>div:nth-child(2){text-align:left;padding-left:14px}.player-actions{z-index:3;background:#fff;justify-content:center;padding:9px;position:fixed;bottom:0;left:0;right:0}.html-stage{padding:14px 14px 70px}.demo-note{padding:25px 18px}.demo-note h1{font-size:24px}.three-notes{grid-template-columns:1fr}.player-footer{display:none}.board-page header{grid-template-columns:auto 1fr}.board-page header>b{display:none}.admin-page{display:block}.admin-page>aside{display:none}.admin-page>section{padding:18px}.stat-grid{grid-template-columns:repeat(2,1fr)}.table-row{grid-template-columns:1.8fr .7fr .8fr}.table-row span:nth-child(3){display:none}}.learning-logo{background:linear-gradient(145deg,#ff7043,#3977df);border-radius:12px;place-items:center;width:36px;height:36px;display:inline-grid;position:relative;box-shadow:0 7px 18px #42578627}.learning-logo:before{content:"";clip-path:polygon(50% 0,100% 34%,50% 70%,0 34%);background:#fff;width:20px;height:13px;transform:rotate(0)}.learning-logo:after{content:"";border:2px solid #fff;border-top:0;border-radius:0 0 5px 5px;width:7px;height:7px;position:absolute;top:20px;left:15px}.learning-logo i{background:#fff;border-radius:3px;width:2px;height:12px;position:absolute;top:11px;right:7px}.learning-logo b{background:#ffd45c;border-radius:50%;width:5px;height:5px;position:absolute;bottom:6px;right:5px}.learning-logo.compact{width:30px;height:30px;box-shadow:none;border-radius:10px;transform:scale(.88)}.player-bar{grid-template-columns:1fr minmax(0,2fr) 1fr;height:56px;padding:0 14px}.player-bar>a{align-items:center;gap:7px;display:flex}.player-bar>div:nth-child(2){text-align:center;overflow:hidden}.player-bar>div:nth-child(2) b{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.html-stage{min-height:calc(100vh - 96px);padding:12px}.player-footer{height:40px}.player-footer button{border:1px solid var(--line);color:#e9633a;background:#fff;border-radius:8px;height:28px;padding:0 10px;font-size:10px}.modern-board-page>header{justify-content:space-between;height:58px;display:flex}.modern-board-page>header>a{align-items:center;gap:7px;display:flex}.modern-board-page>header>div{text-align:right;display:block!important}.modern-board-page>header b,.modern-board-page>header small{display:block}.modern-board-page>header small{color:#99a2af;margin-top:2px;font-size:10px}.modern-board-page>header{grid-template-columns:1fr auto 1fr;display:grid}.modern-board-page>header .board-heading{text-align:center}.board-header-actions{justify-self:end;display:flex}.board-header-actions button{font-size:11px;font-weight:800;color:#596579!important;width:auto!important;height:34px!important;box-shadow:none!important;background:#fff!important;border:1px solid #dfe5ec!important;border-radius:9px!important;padding:0 12px!important}.board-header-actions button.active{color:#fff!important;background:#3977df!important;border-color:#3977df!important}.board-message{z-index:30;color:#fff;background:#273142;border-radius:10px;padding:10px 14px;font-size:11px;position:fixed;bottom:18px;right:18px}@media (max-width:760px){.modern-board-page>header{grid-template-columns:1fr auto}.modern-board-page>header .board-heading{display:none!important}.board-header-actions button{font-size:0;width:42px!important;padding:0!important}.board-header-actions button:before{content:"⛶";font-size:15px}.board-header-actions button.active:before{content:"⊟"}}.subjects{grid-template-columns:repeat(auto-fit,minmax(72px,1fr))}.filter-line button{align-items:center;gap:5px;display:inline-flex}.default-badge{color:#279568;background:#e8f7ef;border-radius:6px;padding:2px 5px;font-size:8px;font-weight:800}.filter-line button.selected .default-badge{color:#fff;background:#ffffff35}@media (max-width:760px){.subjects{grid-template-columns:repeat(4,1fr)}}.player-actions .board-on{color:#fff;background:#3977df;border-color:#3977df}.board-fab{z-index:12;color:#fff;cursor:pointer;background:#273142;border:0;border-radius:19px;place-items:center;width:58px;height:58px;font-size:24px;display:grid;position:fixed;bottom:66px;right:22px;box-shadow:0 12px 30px #18213340}.board-fab span{color:#596273;font-size:10px;font-weight:800;position:absolute;top:61px}.board-fab.active{background:#ff7043;right:min(58vw,742px)}.quick-board{z-index:11;opacity:0;pointer-events:none;background:#eef1f5;border:1px solid #dfe4eb;border-radius:22px;flex-direction:column;width:min(56vw,720px);transition:transform .25s,opacity .2s;display:flex;position:fixed;top:80px;bottom:60px;right:14px;transform:translate(calc(100% + 40px));box-shadow:0 22px 70px #1d293944}.quick-board.open{opacity:1;pointer-events:auto;transform:none}.quick-board>header{background:#fff;border-bottom:1px solid #e3e7ec;border-radius:22px 22px 0 0;justify-content:space-between;align-items:center;height:60px;padding:0 14px 0 18px;display:flex}.quick-board header b,.quick-board header small{display:block}.quick-board header small{color:#9aa2af;margin-top:2px;font-size:9px}.quick-tools{align-items:center;gap:8px;display:flex}.quick-tools button:not(.quick-clear):not(.quick-close){border:3px solid #fff;border-radius:50%;width:23px;height:23px;box-shadow:0 0 0 1px #d7dce4}.quick-tools button.selected{box-shadow:0 0 0 3px #ffb59f!important}.quick-tools .quick-clear,.quick-tools a{color:#687385;background:#fff;border:1px solid #e3e7ec;border-radius:9px;place-items:center;height:30px;padding:0 10px;font-size:11px;text-decoration:none;display:grid}.quick-tools .quick-close{font-size:20px;color:#657080!important;width:30px!important;height:30px!important;box-shadow:none!important;background:#f2f4f7!important;border:0!important;border-radius:9px!important}.quick-board canvas{touch-action:none;cursor:crosshair;background:#fff;border-radius:14px;width:calc(100% - 20px);height:calc(100% - 80px);margin:10px}@media (max-width:760px){.player-actions button:last-child{display:none}.board-fab{bottom:78px;right:14px}.board-fab.active{bottom:calc(72vh + 6px);right:14px}.quick-board{width:auto;height:72vh;inset:auto 8px 72px}.quick-board>header{height:56px;padding-left:12px}.quick-board header small{display:none}.quick-tools{gap:5px}.quick-tools button:not(.quick-clear):not(.quick-close){width:20px;height:20px}.quick-tools a{display:none}.quick-board canvas{height:calc(100% - 76px)}}@media (min-width:761px){.quick-board{width:var(--board-width,620px);max-width:calc(100vw - 28px)}.board-resizer{z-index:3;cursor:ew-resize;touch-action:none;width:14px;position:absolute;top:22px;bottom:22px;left:-7px}.board-resizer:after{content:"";background:#aeb7c5;border-radius:8px;width:4px;height:54px;position:absolute;top:42%;left:5px}.quick-board:hover .board-resizer:after{background:#ff7043}}.quick-tools .tool-button{padding:0 9px;font-size:11px;color:#657080!important;width:auto!important;height:30px!important;box-shadow:none!important;background:#fff!important;border:1px solid #e3e7ec!important;border-radius:9px!important}.quick-tools .tool-button.active{color:#ed6238!important;background:#fff0ea!important;border-color:#ff8b69!important}.quick-tools select{color:#596273;background:#fff;border:1px solid #e3e7ec;border-radius:8px;height:30px;padding:0 5px;font-size:11px}.quick-tools .color-button{flex:none}.quick-board canvas.eraser-cursor{cursor:cell}@media (max-width:1100px) and (min-width:761px){.quick-tools .color-button{display:none}.quick-tools{gap:5px}.quick-tools .tool-button{padding:0 7px}}@media (max-width:760px){.board-resizer{display:none}.quick-tools .tool-button{padding:0 6px;width:auto!important;height:28px!important}.quick-tools select{height:28px}.quick-tools .color-button{display:none}}.shared-whiteboard{background:#eef1f5;flex-direction:column;height:100%;min-height:0;display:flex}.whiteboard-toolbar{background:#fff;border-bottom:1px solid #e3e7ec;flex-direction:column;justify-content:center;gap:8px;min-height:96px;padding:10px 12px;display:flex}.board-page-tools,.board-drawing-tools{flex-wrap:wrap;align-items:center;gap:7px;display:flex}.whiteboard-toolbar button,.whiteboard-toolbar a,.whiteboard-toolbar select{color:#596273;background:#fff;border:1px solid #dfe4eb;border-radius:9px;height:31px;padding:0 10px;font-size:11px;font-weight:700;text-decoration:none}.whiteboard-toolbar 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.whiteboard-toolbar a,.quick-board .whiteboard-toolbar select{height:28px;padding:0 7px}.quick-board .whiteboard-toolbar label{font-size:0}.quick-board .whiteboard-toolbar label select{font-size:10px}.full-whiteboard{border-radius:18px;flex:1;min-height:0;margin:14px;overflow:hidden;box-shadow:0 12px 40px #27314216}.full-whiteboard .whiteboard-toolbar{flex-direction:row;justify-content:space-between;align-items:center;min-height:58px}@media (max-width:760px){.whiteboard-toolbar{min-height:132px}.full-whiteboard{margin:8px}.full-whiteboard .whiteboard-toolbar{flex-direction:column;align-items:flex-start;min-height:132px}.quick-board .whiteboard-toolbar{min-height:132px}.quick-board .whiteboard-toolbar .board-color{display:none}}.whiteboard-toolbar,.full-whiteboard .whiteboard-toolbar,.quick-board .whiteboard-toolbar{box-sizing:border-box;flex-direction:column;justify-content:center;align-items:stretch;gap:7px;height:auto;min-height:82px;padding:8px 12px;display:flex;overflow-x:hidden}.board-page-tools,.board-drawing-tools{flex-wrap:nowrap;justify-content:center;align-items:center;gap:7px;min-width:0;display:flex}.whiteboard-toolbar button,.whiteboard-toolbar a,.whiteboard-toolbar select{box-sizing:border-box;white-space:nowrap;flex:none;place-items:center;min-width:32px;height:32px;padding:0 8px;line-height:1;display:inline-grid}.whiteboard-toolbar .board-tool{width:34px;padding:0;font-size:17px}.whiteboard-toolbar .board-size{flex:none;display:block}.whiteboard-toolbar .board-size select{width:62px;margin:0}.whiteboard-toolbar .board-color{aspect-ratio:1;box-sizing:border-box!important;border-radius:50%!important;flex:0 0 24px!important;width:24px!important;min-width:24px!important;height:24px!important;min-height:24px!important;padding:0!important}.board-page-tools b{text-align:center;white-space:nowrap;flex:none;min-width:38px}.full-whiteboard .whiteboard-surface{margin:0 12px 12px}.quick-board .whiteboard-toolbar button,.quick-board .whiteboard-toolbar a,.quick-board .whiteboard-toolbar select{height:30px}@media (max-width:760px){.whiteboard-toolbar,.full-whiteboard .whiteboard-toolbar,.quick-board .whiteboard-toolbar{min-height:84px;padding:7px 8px}.board-page-tools,.board-drawing-tools{gap:5px}.whiteboard-toolbar .board-color:nth-of-type(n+3){display:none}.whiteboard-toolbar .board-tool{width:30px;min-width:30px}.whiteboard-toolbar .board-size select{width:55px}.whiteboard-toolbar .board-action{padding:0 6px}}.whiteboard-toolbar,.full-whiteboard .whiteboard-toolbar,.quick-board .whiteboard-toolbar{background:#fff;min-height:90px;padding:10px 14px}.whiteboard-toolbar button,.whiteboard-toolbar a,.whiteboard-toolbar select{min-width:36px;height:34px;box-shadow:none!important;color:#4d5a6d!important;background:#f8fafc!important;border:1px solid #dbe2ea!important;border-radius:9px!important}.whiteboard-toolbar button:hover,.whiteboard-toolbar a:hover{background:#fff7f3!important;border-color:#ff9b7d!important}.whiteboard-toolbar button.active{color:#fff!important;background:#ff7043!important;border-color:#ff7043!important}.whiteboard-toolbar .board-tool{font-size:17px;width:40px!important;min-width:40px!important;height:34px!important}.whiteboard-toolbar .board-action{min-width:48px!important;padding:0 10px!important}.whiteboard-toolbar .board-color{width:34px!important;min-width:34px!important;height:34px!important;min-height:34px!important;box-shadow:none!important;border:5px solid #f8fafc!important;border-radius:9px!important;outline:1px solid #dbe2ea!important;flex-basis:34px!important}.whiteboard-toolbar .board-size select{background:#fff!important;width:66px!important}.board-page-tools,.board-drawing-tools{gap:8px}.full-whiteboard .whiteboard-toolbar{flex-direction:row;justify-content:center;gap:14px;min-height:58px}.quick-board .whiteboard-toolbar{min-height:90px}@media (max-width:760px){.full-whiteboard .whiteboard-toolbar{flex-direction:column;min-height:100px}.whiteboard-toolbar .board-color{display:none!important}.whiteboard-toolbar .board-tool{width:34px!important;min-width:34px!important}.board-page-tools,.board-drawing-tools{gap:5px}}.whiteboard-toolbar .board-color{background:var(--board-swatch)!important;display:inline-grid!important}.board-drawing-tools{scrollbar-width:thin;justify-content:flex-start;padding:2px;overflow-x:auto}.board-page-tools{justify-content:center}@media (max-width:760px){.whiteboard-toolbar .board-color{flex-basis:28px!important;width:28px!important;min-width:28px!important;height:28px!important;min-height:28px!important;display:inline-grid!important}}.whiteboard-surface canvas.hand-cursor{cursor:grab}.whiteboard-surface canvas.hand-cursor:active{cursor:grabbing}@media (pointer:coarse){.whiteboard-toolbar button,.whiteboard-toolbar a,.whiteboard-toolbar 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