:root{--bg:#f2f5f8;--panel:#fff;--ink:#17273a;--muted:#6b7b8e;--line:#dfe6ed;--accent:#238d83;--soft:#eaf6f3;--stage:#111c2c}html[data-theme=dark]{color-scheme:dark;--bg:#0b1421;--panel:#162337;--ink:#ecf3fb;--muted:#a3b4c8;--line:#314155;--accent:#5ac9b7;--soft:#1c3939;--stage:#080f19}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif}button,select,input{font:inherit}button{cursor:pointer}.hidden{display:none!important}.topbar{height:62px;padding:0 22px;display:flex;align-items:center;justify-content:space-between;background:var(--panel);border-bottom:1px solid var(--line);gap:10px}.brand{display:flex;align-items:center;gap:8px;font-size:17px;font-weight:700;white-space:nowrap}.brand b{color:var(--accent)}.mark{display:grid;place-items:center;width:34px;height:34px;background:#132a3e;color:#fff;border-radius:10px}.status{font-size:12px;color:var(--muted)}.topactions{display:flex;gap:8px}.quiet,.outline,.control,.toolbar button,.upload-btn{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:9px;padding:9px 12px}.outline{background:var(--soft);color:var(--accent);font-weight:700}.outline:disabled{opacity:.5}.primary{border:0;border-radius:10px;background:#238d83;color:#fff;padding:12px 23px;font-weight:700}.layout{height:calc(100dvh - 62px);min-height:420px;display:flex;gap:0}.meeting{flex:1;min-width:0;display:flex;flex-direction:column;padding:15px;gap:12px}.meeting-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.meeting-head h1{font-size:17px;margin:0}.stage{flex:1;min-height:0;position:relative;background:var(--stage);border-radius:15px;overflow:hidden;display:flex;align-items:center;justify-content:center}.before-join{text-align:center;color:#f4f8ff}.before-join h2{font-size:19px;font-weight:600;margin:12px 0 24px}.join-symbol{font-size:40px;color:#6dcabb}.tiles{position:absolute;inset:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(42%,1fr));gap:8px;padding:8px}.tile{position:relative;min-width:0;min-height:0;border-radius:12px;overflow:hidden;background:#26364a;color:white;display:flex;align-items:center;justify-content:center}.tile video{width:100%;height:100%;object-fit:cover}.tile.screen video{object-fit:contain}.tile-label{position:absolute;bottom:10px;left:10px;background:#07111dc9;color:#fff;padding:5px 9px;border-radius:7px;font-size:12px;z-index:1}.callbar{display:flex;justify-content:center;align-items:center;gap:10px;flex-wrap:wrap;background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:10px}.control{min-height:39px;font-size:13px}.control.off{color:#c85858}.control:disabled{opacity:.5}.control.danger{background:#b93646;color:#fff;border-color:#b93646}.device-block{display:flex;align-items:center;gap:5px}.device-block select{max-width:155px;padding:9px 5px;border-radius:8px;background:var(--panel);color:var(--ink);border:1px solid var(--line);font-size:11px}.canvas-panel{width:58%;min-width:0;display:flex;flex-direction:column;border-left:1px solid var(--line);background:var(--panel);padding:15px;gap:10px}.layout.canvas-open .meeting{width:42%;flex:0 0 42%;order:2}.layout.canvas-open .canvas-panel{width:58%;order:1;border-left:0;border-right:1px solid var(--line)}.layout.canvas-open .tiles{display:flex;flex-direction:column;gap:8px}.layout.canvas-open .tile{flex:1;min-height:0}.canvas-head{display:flex;justify-content:space-between;align-items:center}.canvas-head h2{margin:0 0 4px;font-size:17px}.canvas-head span,.toolbar{display:flex;gap:5px;flex-wrap:wrap;align-items:center}.toolbar button,.upload-btn{font-size:12px;padding:7px 9px}.toolbar button.active{background:var(--accent);color:white}.toolbar .clear{margin-left:auto;color:#c65a5a}.tool-divider{width:1px;height:22px;background:var(--line)}#penColor{width:32px;height:31px;padding:2px;background:var(--panel);border:1px solid var(--line);border-radius:7px}.canvas-area{position:relative;flex:1;min-height:160px;overflow:auto;background:#fff;border:1px solid #dfe5ec;border-radius:10px}.editor{min-height:100%;padding:22px;outline:0;color:#273a4b;line-height:1.65;font-size:15px;overflow-wrap:anywhere}.editor h2{font-size:21px}.editor img{max-width:100%;height:auto;display:block;margin:12px 0;border-radius:7px}.canvas-area canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;touch-action:none}.canvas-area.pen-on canvas{pointer-events:auto;cursor:crosshair}dialog{border:1px solid var(--line);border-radius:16px;background:var(--panel);color:var(--ink);padding:0;width:min(420px,calc(100vw - 30px));box-shadow:0 20px 70px #0005}dialog::backdrop{background:#071422a8}dialog form{padding:25px;display:flex;flex-direction:column;gap:13px}dialog h2{margin:0;font-size:21px}dialog p{font-size:13px;color:var(--muted)}dialog label{font-size:13px;font-weight:700}dialog input{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:8px;padding:11px}.dialog-actions{display:flex;justify-content:flex-end;gap:10px}.dialog-actions button:not(.primary){border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:8px;padding:10px 15px}.error{color:#c95b5b!important}@media(max-width:900px){.layout.canvas-open{flex-direction:column}.layout.canvas-open .canvas-panel{width:100%;flex:1;min-height:48%;order:1}.layout.canvas-open .meeting{width:100%;flex:0 0 38%;min-height:180px;order:2}.layout.canvas-open .tiles{flex-direction:row}.layout.canvas-open .tile{flex:1}.layout.canvas-open .meeting-head{display:none}.layout.canvas-open .callbar{padding:5px}.layout.canvas-open .control{padding:6px}.layout.canvas-open .device-block select{max-width:105px}}@media(max-width:550px){.topbar{padding:0 10px}.status{display:none}.topactions .quiet{font-size:11px;padding:8px}.meeting{padding:8px}.callbar{gap:5px}.control span{display:none}.device-block select{max-width:90px}.canvas-panel{padding:8px}.toolbar{gap:3px}.toolbar button,.upload-btn{padding:6px}.layout.canvas-open .meeting{flex-basis:34%}}

/* Ensure the join button is above the empty video tiles overlay. */
.before-join{position:relative;z-index:3}

/* V3: icon-only call controls and image resizing */
.icon-control{width:44px;height:44px;display:grid;place-items:center;font-size:21px;transition:background .15s,color .15s}
.icon-control.off{background:#b92337!important;color:#fff!important;border-color:#b92337!important}
.editor img{resize:both;overflow:auto;min-width:60px;min-height:45px;width:320px;max-width:100%;height:auto;cursor:nwse-resize;display:block}
.editor img.selected-image{outline:2px solid #238d83;outline-offset:3px}
.toolbar select{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:7px 5px;font-size:12px}
#textColor{height:32px;width:35px;border:1px solid var(--line);border-radius:7px;padding:2px;background:var(--panel)}
.canvas-hint{font-size:11px;color:var(--muted)}
.camera-placeholder{color:#dbe7f4;font-size:14px}

.resizable-image{display:inline-block;position:relative;resize:both;overflow:hidden;min-width:70px;min-height:55px;max-width:100%;width:320px;height:240px;vertical-align:top;margin:12px 0;border:1px dashed #b7c9d7;border-radius:7px;cursor:nwse-resize}
.resizable-image img{width:100%!important;height:100%!important;max-width:none!important;object-fit:contain;display:block;margin:0;resize:none;cursor:default}
.resizable-image.selected-image{outline:2px solid #238d83;outline-offset:3px}

/* Version 15: local-only sizing, lessons and clear status icons */
:root{--canvas-percent:58%;--camera-scale:1}
.layout.canvas-open .meeting{width:calc(100% - var(--canvas-percent));flex:0 0 calc(100% - var(--canvas-percent))}
.layout.canvas-open .canvas-panel{width:var(--canvas-percent)}
.canvas-panel{overflow:hidden}.canvas-workspace{display:flex;flex:1;min-height:0;gap:10px}
.lesson-sidebar{flex:0 0 145px;border-right:1px solid var(--line);display:flex;flex-direction:column;gap:7px;padding:6px 9px 6px 0;min-width:0}
.lesson-heading{font-weight:700;font-size:12px;color:var(--muted);padding:6px}.lesson-list{display:flex;flex-direction:column;gap:5px;overflow-y:auto;min-height:0;flex:1}
.lesson-item{background:transparent;color:var(--ink);border:1px solid transparent;border-radius:8px;padding:10px 8px;text-align:left;font-size:12px;overflow-wrap:anywhere}
.lesson-item.selected{background:var(--soft);border-color:var(--accent);font-weight:700}.lesson-action{padding:7px;font-size:11px}.add-lesson{padding:8px;font-size:11px}
.canvas-main{display:flex;flex-direction:column;gap:9px;flex:1;min-width:0;min-height:0}.canvas-options{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--muted)}.canvas-options input{width:100px}.canvas-options span{font-size:10px}
.size-control{display:flex;align-items:center;gap:6px;color:var(--muted);font-size:11px}.size-control input{width:90px}
.layout.canvas-open .tile{flex:var(--camera-scale) 1 0;min-height:0}
.tile-status{position:absolute;bottom:9px;right:9px;display:flex;gap:5px;z-index:2}.tile-status span{display:grid;place-items:center;background:#b92337;color:#fff;border-radius:6px;padding:4px 6px;font-size:15px;min-width:27px;height:27px}
.icon-control{position:relative;display:flex;align-items:center;justify-content:center;padding:8px}.icon-control svg{width:23px;height:23px;flex-shrink:0}.icon-control .slash{position:absolute;transform:rotate(-45deg);width:27px;height:2px;background:currentColor;border-radius:2px}
.device-block{align-items:center}.device-block select{height:44px}
@media(max-width:900px){.layout.canvas-open .meeting{width:100%;flex:0 0 38%}.layout.canvas-open .canvas-panel{width:100%}.lesson-sidebar{flex-basis:105px}}
@media(max-width:550px){.lesson-sidebar{flex-basis:78px}.lesson-item{font-size:10px;padding:7px 3px}.size-control{font-size:0}.size-control input{width:65px}.canvas-options span{display:none}}

/* Version 16: automatic, unobtrusive lesson duration clock */
.lesson-clock{font-variant-numeric:tabular-nums;font-size:16px;font-weight:750;color:var(--ink);background:var(--soft);border:1px solid var(--line);border-radius:11px;padding:9px 14px;white-space:nowrap;letter-spacing:.02em;box-shadow:0 2px 8px #10253b0a}
@media(max-width:550px){.lesson-clock{font-size:14px;padding:7px 10px}}

/* Draggable divider between the shared canvas (left) and video (right). */
.layout.canvas-open .split-handle{order:1;flex:0 0 14px;width:14px;position:relative;display:flex;align-items:center;justify-content:center;cursor:col-resize;touch-action:none;background:var(--line);z-index:10;user-select:none}
.layout.canvas-open .split-handle span{background:var(--panel);border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:13px 3px;font-size:16px;line-height:1;box-shadow:0 2px 8px #0002}
.layout.canvas-open .split-handle:hover,.layout.canvas-open .split-handle:focus-visible{background:var(--accent);outline:none}
.layout.canvas-open .canvas-panel{width:calc(var(--canvas-percent) - 7px);flex:0 0 calc(var(--canvas-percent) - 7px);order:0}
.layout.canvas-open .meeting{width:calc(100% - var(--canvas-percent) - 7px);flex:0 0 calc(100% - var(--canvas-percent) - 7px);order:2}
.canvas-area.eraser-on canvas{pointer-events:auto;cursor:cell}
@media(max-width:900px){.layout.canvas-open .split-handle{display:none!important}.layout.canvas-open .canvas-panel{width:100%;flex:1;order:1}.layout.canvas-open .meeting{width:100%;flex:0 0 38%;order:2}}

/* v19: compact matching SVG badges and visible image drag handle */
.tile-status span{position:relative;width:32px;height:32px;padding:5px;border-radius:9px;background:#b92337;box-shadow:0 1px 6px #0005}
.tile-status svg{width:21px;height:21px;stroke-width:2.1}
.tile-status .slash{position:absolute;left:4px;top:15px;width:24px;height:2px;background:#fff;transform:rotate(-45deg);border-radius:3px;box-shadow:0 0 0 1px #b92337}
.resizable-image{resize:none!important;overflow:visible!important;box-sizing:border-box}
.resizable-image img{pointer-events:auto}
.image-resize-handle{position:absolute;bottom:-7px;right:-7px;width:25px;height:25px;border:2px solid #fff;border-radius:6px;background:#168b8a;color:#fff;display:none;align-items:center;justify-content:center;cursor:nwse-resize;touch-action:none;user-select:none;z-index:8;font-size:18px;font-weight:bold;box-shadow:0 1px 7px #0005}
.resizable-image.selected-image .image-resize-handle,.resizable-image.resizing-image .image-resize-handle{display:flex}
.resizable-image.selected-image{outline:2px solid #168b8a;outline-offset:2px}


/* v26: keep the resize grip visible and easy to grab, including at image edges. */
.resizable-image{touch-action:none;cursor:default}
.resizable-image .image-resize-handle{bottom:0;right:0;width:32px;height:32px;border-radius:8px 0 6px 0;z-index:20;touch-action:none;cursor:nwse-resize}
.resizable-image.selected-image .image-resize-handle,.resizable-image.resizing-image .image-resize-handle{display:flex}
.resizable-image.resizing-image{outline:2px solid #168b8a}

/* v27: Microsoft Word-style 8-point image resize and free movement */
.editor{position:relative}
.resizable-image{resize:none!important;overflow:visible!important;touch-action:none;cursor:move}
.resizable-image img{pointer-events:auto;user-select:none;-webkit-user-drag:none}
.word-image-frame{position:absolute;z-index:50;box-sizing:border-box;border:2px solid #238d83;pointer-events:none;overflow:visible}
.word-image-handle{position:absolute;pointer-events:auto;width:12px;height:12px;border:2px solid white;background:#238d83;border-radius:50%;padding:0;box-shadow:0 1px 4px #0007;touch-action:none;transform:translate(-50%,-50%)}
.handle-nw{left:0;top:0;cursor:nwse-resize}.handle-n{left:50%;top:0;cursor:ns-resize}.handle-ne{left:100%;top:0;cursor:nesw-resize}
.handle-e{left:100%;top:50%;cursor:ew-resize}.handle-se{left:100%;top:100%;cursor:nwse-resize}.handle-s{left:50%;top:100%;cursor:ns-resize}
.handle-sw{left:0;top:100%;cursor:nesw-resize}.handle-w{left:0;top:50%;cursor:ew-resize}
.word-image-move{position:absolute;left:50%;top:-38px;transform:translateX(-50%);border:1px solid #fff;background:#167e78;color:white;border-radius:7px;padding:5px 12px;font-size:12px;font-weight:700;white-space:nowrap;cursor:grab;pointer-events:auto;touch-action:none;box-shadow:0 2px 7px #0004}
.word-image-move:active{cursor:grabbing}

/* v30 — compact page thumbnails inspired by the reference classroom layout */
.canvas-panel{padding:9px 10px 10px;gap:8px}
.canvas-workspace{gap:8px}
.lesson-sidebar{flex:0 0 94px;width:94px;gap:6px;padding:0 7px 0 0;border-right:1px solid var(--line);background:var(--panel);transition:flex-basis .15s,width .15s}
.lesson-heading{display:flex;justify-content:space-between;align-items:center;padding:2px 1px 4px 4px;font-size:11px}
.sidebar-collapse{border:0;background:var(--soft);color:var(--ink);border-radius:6px;padding:3px 7px;font-size:14px;cursor:pointer}
.lesson-list{gap:7px;scrollbar-width:thin;padding:2px 2px 5px}
.lesson-item{position:relative;display:flex;flex-direction:column;align-items:center;gap:3px;flex:0 0 auto;width:100%;padding:4px;border:1px solid transparent;border-radius:8px;text-align:center;background:transparent;overflow:visible}
.lesson-item.selected{background:#f7e7ee;border-color:#ed82ac;color:#9e2857}
.lesson-number{align-self:flex-start;font-size:10px;font-weight:700;line-height:1}
.lesson-paper{display:block;position:relative;width:66px;height:82px;background:white;border:1px solid #d9dde3;border-radius:4px;overflow:hidden;box-shadow:0 1px 3px #0001;pointer-events:none}
.lesson-preview{display:block;position:absolute;top:0;left:0;width:420px;height:520px;overflow:hidden;transform:scale(.157);transform-origin:top left;text-align:left;color:#263344;font-family:Arial,sans-serif;font-size:16px;line-height:1.4;overflow-wrap:anywhere;padding:12px;pointer-events:none}
.lesson-preview img{max-width:100%;height:auto;object-fit:contain}.lesson-preview *{max-width:100%}
.lesson-name{font-size:10px;line-height:1.2;max-width:75px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.add-lesson{border:0;background:var(--soft);color:var(--ink);border-radius:8px;font-size:23px;font-weight:400;height:34px;flex:0 0 34px;padding:0}
.lesson-more{display:flex;gap:3px}.lesson-more .lesson-action{padding:5px 2px;flex:1;font-size:9px;border-radius:5px}
.lesson-sidebar.collapsed{flex-basis:28px;width:28px;padding-right:3px}.lesson-sidebar.collapsed .lesson-heading span,.lesson-sidebar.collapsed .lesson-list,.lesson-sidebar.collapsed .add-lesson,.lesson-sidebar.collapsed .lesson-more{display:none}
.lesson-sidebar.collapsed .lesson-heading{padding:2px 0}.lesson-sidebar.collapsed .sidebar-collapse{padding:4px 6px}
.canvas-main{gap:6px}.toolbar{gap:4px}.toolbar button,.upload-btn{padding:6px 8px}.canvas-area{border-radius:6px}
@media(max-width:900px){.lesson-sidebar{flex-basis:82px;width:82px}.lesson-paper{width:60px;height:75px}.lesson-preview{transform:scale(.143)}}
@media(max-width:550px){.lesson-sidebar{flex-basis:72px;width:72px}.lesson-paper{width:52px;height:66px}.lesson-preview{transform:scale(.124)}.lesson-name{max-width:55px}}

/* v32: compact meeting controls, network health, save feedback, remote cursors */
.callbar{align-self:center;max-width:100%;width:max-content;border-radius:18px;padding:7px 10px;gap:7px;box-shadow:0 8px 28px #00000013}
.callbar .control{border-radius:11px;min-height:40px;padding:8px 11px}
.callbar .icon-control{width:42px;display:grid;place-items:center}
.callbar .device-block{gap:3px;border-radius:12px}
.callbar .device-block select{max-width:118px;font-size:11px;padding:7px 3px}
.callbar #screenBtn,.callbar #leaveBtn{white-space:nowrap}
.quality-status{display:inline-flex;align-items:center;gap:6px;font-size:11px;white-space:nowrap;color:var(--muted);border:1px solid var(--line);padding:5px 9px;border-radius:99px}
.quality-dot{width:8px;height:8px;border-radius:50%;background:#94a3b8}
.quality-status[data-quality=excellent] .quality-dot{background:#16a34a}
.quality-status[data-quality=good] .quality-dot{background:#84cc16}
.quality-status[data-quality=poor] .quality-dot{background:#ef4444}
#syncStatus[data-save=saved]{color:#16875a}#syncStatus[data-save=saving]{color:#c0821e}#syncStatus[data-save=error]{color:#d14b4b}
.canvas-area{position:relative}
.remote-cursors{position:absolute;inset:0;pointer-events:none;z-index:9;overflow:hidden}
.remote-cursor{position:absolute;border-left:2px solid var(--cursor-color);width:1px;pointer-events:none}
.remote-cursor-label{position:absolute;left:-2px;bottom:100%;white-space:nowrap;max-width:135px;overflow:hidden;text-overflow:ellipsis;padding:2px 5px;border-radius:5px 5px 5px 0;background:var(--cursor-color);color:white;font:600 10px system-ui}
@media(max-width:760px){.quality-status{font-size:0;padding:6px}.quality-status .quality-dot{width:9px;height:9px}.callbar{width:100%;gap:5px;padding:7px}.callbar .device-block select{max-width:82px}.callbar .control{padding:7px 8px}}

/* v33: small, unobtrusive participant-specific connection bars */
.participant-signal{position:absolute;bottom:12px;left:10px;transform:translateY(-33px);z-index:4;display:inline-flex;align-items:flex-end;gap:2px;height:19px;padding:3px 5px;border-radius:6px;background:rgba(7,17,29,.78);color:#94a3b8;pointer-events:auto}
.participant-signal span{display:block;width:3px;border-radius:2px;background:currentColor;opacity:.32}
.participant-signal span:nth-child(1){height:4px}.participant-signal span:nth-child(2){height:7px}.participant-signal span:nth-child(3){height:10px}.participant-signal span:nth-child(4){height:13px}
.participant-signal[data-quality=excellent]{color:#22c55e}.participant-signal[data-quality=excellent] span{opacity:1}
.participant-signal[data-quality=good]{color:#eab308}.participant-signal[data-quality=good] span:nth-child(-n+3){opacity:1}
.participant-signal[data-quality=poor],.participant-signal[data-quality=lost]{color:#ef4444}.participant-signal[data-quality=poor] span:first-child{opacity:1}.participant-signal[data-quality=lost] span{opacity:.18}
@media(max-width:550px){.participant-signal{bottom:8px;left:7px;transform:translateY(-30px)}}

/* v36: local fullscreen canvas, drawing tool settings */
.canvas-head-actions{display:flex;align-items:center;gap:7px}.drawing-setting{display:inline-flex;align-items:center;gap:4px;font-size:11px;color:var(--muted)}.drawing-setting input{width:65px;accent-color:var(--accent)}#shapeTool{max-width:112px;padding:6px;border-radius:7px;border:1px solid var(--line);background:var(--panel);color:var(--ink);font-size:12px}
body.canvas-focus-mode .layout.canvas-open{position:fixed;inset:0;z-index:100;background:var(--panel);height:100dvh;min-height:0;display:flex;flex-direction:row}
body.canvas-focus-mode .layout.canvas-open .canvas-panel{order:0!important;flex:1 1 auto!important;width:100%!important;height:100%!important;min-height:0!important;padding:12px}
body.canvas-focus-mode .layout.canvas-open .meeting,body.canvas-focus-mode .layout.canvas-open .split-handle{display:none!important}
body.canvas-focus-mode .layout.canvas-open .canvas-workspace{min-height:0;flex:1}body.canvas-focus-mode .layout.canvas-open .canvas-area{min-height:0;flex:1}
@media(max-width:600px){.canvas-head-actions .quiet{font-size:11px;padding:7px}.drawing-setting input{width:48px}}

/* v37 visual refinement: meeting dock, grouped canvas tools, calm surfaces */
:root{--bg:#f4f7fa;--panel:#ffffff;--line:#e3eaf1;--ink:#1b2c40;--muted:#718197;--accent:#168b80;--soft:#e8f7f3;--stage:#101b2c}
html[data-theme=dark]{--bg:#0d1522;--panel:#172335;--line:#2b3b50;--ink:#eef4fa;--muted:#a7b5c8;--accent:#60d0bf;--soft:#183d3b;--stage:#0b111d}
body{letter-spacing:-.008em}.topbar{box-shadow:0 1px 6px #091c3208}.mark{border-radius:12px;background:linear-gradient(145deg,#153a49,#168b80)}
button,select{transition:background .15s ease,border-color .15s ease,box-shadow .15s ease}button:hover:not(:disabled),.upload-btn:hover{border-color:var(--accent)}button:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.meeting{position:relative;padding:14px;gap:10px}.stage{border-radius:20px;box-shadow:0 12px 30px #081c3210}.tiles{padding:10px;gap:10px}.tile{border-radius:16px;background:linear-gradient(140deg,#24374b,#172538);border:1px solid #ffffff18;box-shadow:inset 0 0 0 1px #00000012}.tile-label{bottom:13px;left:13px;border-radius:9px;background:#07111dcf;backdrop-filter:blur(10px);font-weight:600;padding:7px 10px}.tile-status{bottom:13px;right:13px}
.callbar{position:absolute;z-index:15;left:50%;bottom:28px;transform:translateX(-50%);width:max-content;max-width:calc(100% - 24px);border:1px solid #ffffff36;background:color-mix(in srgb,var(--panel) 92%,transparent);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-radius:20px;box-shadow:0 14px 38px #09182b36;padding:8px 10px;gap:8px;flex-wrap:nowrap}.callbar .control{min-height:42px;border-radius:12px}.callbar .icon-control{width:44px}.callbar .device-block select{max-width:110px}.callbar .danger{background:#b73a4c}
.canvas-panel{background:var(--bg);padding:12px;gap:10px}.canvas-head{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:10px 14px}.canvas-head h2{font-size:16px}.canvas-workspace{gap:10px}.canvas-main{min-width:0}.canvas-area{border-radius:14px;box-shadow:0 3px 14px #10253b0b}.lesson-sidebar{border-radius:14px}
.toolbar-v37{display:flex;align-items:center;gap:7px;flex-wrap:wrap;padding:8px;background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:0 2px 12px #10253b08;position:relative;z-index:5}
.toolbar-v37 .tool-group{display:flex;align-items:center;flex-wrap:wrap;gap:4px;padding:4px 8px 4px 6px;border-right:1px solid var(--line)}.toolbar-v37 .tool-group-label{font-size:10px;text-transform:uppercase;letter-spacing:.065em;font-weight:800;color:var(--muted);margin-right:3px}.toolbar-v37 button,.toolbar-v37 .upload-btn{border-radius:8px;white-space:nowrap;min-height:31px}.toolbar-v37 select{max-width:108px;min-height:31px}.toolbar-v37 #fontFamily{max-width:98px}.toolbar-v37 #fontSize{max-width:85px}.toolbar-v37 .drawing-setting input{width:54px}.toolbar-v37 .tool-draw{flex:1 1 auto}.toolbar-v37 .tool-history{border-right:0}
.tool-more{position:relative;margin-left:auto}.tool-more summary{list-style:none;cursor:pointer;background:var(--soft);color:var(--accent);font-size:12px;font-weight:700;border-radius:9px;padding:9px 11px;white-space:nowrap}.tool-more summary::-webkit-details-marker{display:none}.tool-more[open] summary{outline:1px solid var(--accent)}.tool-more-content{position:absolute;z-index:50;right:0;top:calc(100% + 8px);width:min(360px,calc(100vw - 36px));display:flex;flex-wrap:wrap;align-items:center;gap:6px;padding:12px;border:1px solid var(--line);border-radius:13px;background:var(--panel);box-shadow:0 16px 38px #0003}.tool-more-content .canvas-hint{font-size:11px;color:var(--muted);line-height:1.4}
@media(max-width:1050px){.toolbar-v37 .tool-group{padding:3px 5px}.toolbar-v37 .tool-group-label{display:none}.toolbar-v37 .tool-history{flex:1 1 auto}.callbar .device-block select{max-width:80px}}
@media(max-width:760px){.callbar{bottom:12px;max-width:calc(100% - 12px);padding:5px;gap:4px}.callbar .device-block select{max-width:64px}.callbar .control{padding:6px 8px}.toolbar-v37{gap:4px;padding:5px}.toolbar-v37 .tool-group{gap:3px}.toolbar-v37 button{font-size:11px}.canvas-panel{padding:7px}.canvas-head{padding:8px}}
@media(max-width:550px){.callbar .device-block select{max-width:50px}.callbar #screenBtn{font-size:11px}.toolbar-v37 .tool-draw{flex-basis:100%}.toolbar-v37 .tool-history{flex-basis:auto}.toolbar-v37 .drawing-setting input{width:40px}}

/* v40 — Preply-inspired professional opening screen */
body:not(.in-meeting) #connectionStatus,body:not(.in-meeting) #qualityStatus,body:not(.in-meeting) #lessonClockWrap{display:none!important}
.home-screen{position:relative;isolation:isolate;min-height:calc(100dvh - 62px);overflow:hidden;display:flex;align-items:center;justify-content:center;padding:clamp(28px,5vw,72px) clamp(20px,6vw,88px);background:radial-gradient(ellipse at 76% 28%,color-mix(in srgb,var(--accent) 13%,transparent),transparent 36%),linear-gradient(135deg,var(--bg),color-mix(in srgb,var(--panel) 70%,var(--bg)));}
.home-content{position:relative;z-index:1;width:min(1180px,100%);margin:0 auto}.home-eyebrow{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:10px;font-weight:800;letter-spacing:.16em}.home-eyebrow-dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 5px color-mix(in srgb,var(--accent) 13%,transparent)}
.home-hero{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(300px,.9fr);align-items:center;gap:clamp(24px,5vw,76px);padding:clamp(30px,5vw,68px) 0 44px}.home-brand-lockup{display:flex;align-items:center;gap:10px;font-size:13px;font-weight:850;letter-spacing:.14em;color:var(--ink)}.home-brand-lockup b{color:var(--accent)}.home-brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:13px;background:linear-gradient(145deg,#153a49,#168b80);color:#fff;font-size:19px;letter-spacing:0;box-shadow:0 8px 18px #168b8030}
.home-copy h1{margin:26px 0 15px;font-size:clamp(42px,5.7vw,76px);line-height:1.04;letter-spacing:-.055em;font-weight:780;color:var(--ink)}.home-copy h1 span{color:var(--accent)}.home-subtitle{max-width:490px;margin:0;color:var(--muted);font-size:clamp(15px,1.4vw,18px);line-height:1.7}.home-welcome{margin:25px 0 15px;color:var(--ink);font-size:14px;font-weight:700}.enter-lesson-btn{display:inline-flex;align-items:center;justify-content:space-between;gap:44px;min-width:210px;padding:15px 17px 15px 22px;border:0;border-radius:13px;background:linear-gradient(135deg,#168b80,#167c76);color:#fff;font-size:15px;font-weight:750;box-shadow:0 12px 26px #168b8030;transition:transform .18s ease,box-shadow .18s ease}.enter-lesson-btn:hover{transform:translateY(-2px);box-shadow:0 16px 32px #168b8040}.enter-arrow{display:grid;place-items:center;width:29px;height:29px;border-radius:9px;background:#ffffff25;font-size:21px;line-height:1}.home-private-note{display:flex;align-items:center;gap:7px;margin:15px 0 0;color:var(--muted);font-size:11px}.home-private-note span{font-size:15px;color:var(--accent)}
.home-art{position:relative;min-height:360px;display:grid;place-items:center}.home-art-glow{position:absolute;width:min(90%,430px);aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 19%,transparent),transparent 68%);filter:blur(12px)}.home-art-card{position:absolute;width:min(76%,365px);height:245px;border:1px solid color-mix(in srgb,var(--line) 75%,transparent);border-radius:22px;background:color-mix(in srgb,var(--panel) 90%,transparent);box-shadow:0 28px 70px #0a1d3020;backdrop-filter:blur(16px)}.home-art-card-back{transform:translate(38px,-28px) rotate(8deg);opacity:.62}.home-art-card-front{transform:translate(-5px,12px) rotate(-4deg);padding:17px;display:flex;flex-direction:column;justify-content:space-between;overflow:hidden}.art-card-top{display:flex;align-items:center;gap:5px}.art-card-dot{width:7px;height:7px;border-radius:50%;background:var(--line)}.art-card-title{margin-left:auto;color:var(--muted);font-size:9px;font-weight:800;letter-spacing:.13em}.art-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:86px;height:86px;border-radius:26px;display:grid;place-items:center;background:linear-gradient(145deg,#168b80,#1b6f78);color:#fff;font-size:25px;box-shadow:0 15px 30px #168b8040}.art-card-bottom{display:flex;justify-content:space-between;align-items:end}.art-card-bottom b,.art-card-bottom small{display:block}.art-card-bottom b{font-size:16px;color:var(--ink)}.art-card-bottom small{margin-top:4px;font-size:10px;color:var(--muted)}.art-sparkle{color:var(--accent);font-size:27px}.art-lines{position:absolute;left:22px;right:22px;top:35px;display:grid;gap:12px}.art-lines i{height:8px;border-radius:9px;background:var(--line)}.art-lines i:nth-child(2){width:75%}.art-lines i:nth-child(3){width:54%}.home-art-badge{position:absolute;right:0;bottom:17px;padding:11px 15px;border:1px solid var(--line);border-radius:12px;background:var(--panel);color:var(--muted);font-size:9px;font-weight:850;letter-spacing:.12em;box-shadow:0 10px 28px #0a1d3014}.home-art-badge span{color:var(--accent);margin-right:5px}.home-orb{position:absolute;z-index:-1;border-radius:50%;pointer-events:none}.home-orb-one{width:300px;height:300px;right:-150px;top:8%;border:1px solid color-mix(in srgb,var(--accent) 13%,transparent)}.home-orb-two{width:190px;height:190px;left:-100px;bottom:2%;border:1px solid color-mix(in srgb,var(--accent) 12%,transparent)}.home-bottom-line{display:flex;align-items:center;gap:14px;color:var(--muted);font-size:9px;font-weight:800;letter-spacing:.15em}.home-bottom-divider{height:1px;width:42px;background:var(--line)}
@media(max-width:800px){.home-screen{min-height:calc(100dvh - 62px);padding:35px 24px}.home-hero{grid-template-columns:1fr;gap:8px;padding:35px 0 28px}.home-copy h1{font-size:clamp(42px,10vw,62px)}.home-art{min-height:270px;margin-top:0}.home-art-card{height:205px;width:min(76%,330px)}.home-art-badge{right:5%;bottom:0}.home-bottom-line{font-size:8px}}
@media(max-width:480px){.topbar{height:58px;padding:0 13px}.home-screen{min-height:calc(100dvh - 58px);padding:27px 20px}.home-hero{padding:30px 0 22px}.home-copy h1{margin-top:21px}.home-art{min-height:230px}.home-art-card{height:175px;width:78%;border-radius:18px}.home-art-card-front{padding:13px}.art-play{width:66px;height:66px;border-radius:20px}.home-bottom-line{gap:8px;letter-spacing:.1em}.home-bottom-divider{width:22px}}


/* v41 — User-provided anatomy artwork for the home screen */
.home-art-anatomy{min-height:470px;isolation:isolate}
.anatomy-art-frame{position:absolute;z-index:1;overflow:hidden;aspect-ratio:9/16;border:7px solid #f4ead5;border-radius:18px;background:#e9ddc4;box-shadow:0 24px 58px #101b2d35,0 3px 10px #101b2d18;transition:transform .28s ease,box-shadow .28s ease}
.anatomy-art-frame img{display:block;width:100%;height:100%;object-fit:cover}
.anatomy-art-main{height:min(430px,calc(100% - 30px));left:8%;top:50%;transform:translateY(-50%) rotate(-5deg)}
.anatomy-art-heart{height:min(330px,76%);right:4%;bottom:1%;transform:rotate(6deg);border-width:6px}
.home-art-anatomy:hover .anatomy-art-main{transform:translateY(-51%) rotate(-2deg)}
.home-art-anatomy:hover .anatomy-art-heart{transform:translateY(-5px) rotate(3deg)}
.home-art-anatomy .home-art-glow{width:94%;background:radial-gradient(circle,color-mix(in srgb,#c79d61 25%,transparent),transparent 69%)}
.home-art-anatomy .home-art-badge{right:0;bottom:0;z-index:2;background:var(--panel);backdrop-filter:blur(12px)}
@media(max-width:800px){.home-art-anatomy{min-height:390px}.anatomy-art-main{height:min(345px,calc(100% - 26px));left:13%}.anatomy-art-heart{height:min(270px,74%);right:9%;bottom:1%}.home-art-anatomy .home-art-badge{right:4%;bottom:-2px}}
@media(max-width:480px){.home-art-anatomy{min-height:325px}.anatomy-art-frame{border-width:5px;border-radius:14px}.anatomy-art-main{height:285px;left:9%}.anatomy-art-heart{height:220px;right:3%;border-width:4px}.home-art-anatomy .home-art-badge{font-size:8px;padding:8px 10px;right:0}}

/* v45: retain exact numeric font-size control without camera layout modes */
.numeric-text-size{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:11px;font-weight:700;white-space:nowrap}.numeric-text-size input{width:58px;height:32px;border:1px solid var(--line);border-radius:7px;padding:3px 5px;background:var(--panel);color:var(--ink);font:inherit;font-size:13px;text-align:center;font-variant-numeric:tabular-nums}
@media(max-width:760px){.numeric-text-size{gap:4px}.numeric-text-size input{width:48px;height:30px}}

/* v51 — screen presentation keeps camera tiles visible and temporarily hides
   the Canvas locally. When sharing stops, the normal v37 layout is restored. */
.presentation-switch{white-space:nowrap;background:var(--soft);color:var(--accent);border-color:var(--accent)}
.room-notice{position:absolute;z-index:20;left:50%;top:14px;transform:translateX(-50%);max-width:min(92%,390px);padding:9px 14px;border:1px solid #ffffff44;border-radius:12px;background:#10283dec;color:white;text-align:center;font-size:12px;box-shadow:0 8px 24px #0005;pointer-events:none}
body.presentation-mode .layout .canvas-panel,body.presentation-mode .layout .split-handle{display:none!important}
body.presentation-mode .layout .meeting{flex:1 1 100%!important;width:100%!important;order:0!important;min-width:0}
body.presentation-mode .layout .stage{min-height:0;flex:1}
body.presentation-mode .layout .tiles.presentation-tiles{display:grid!important;grid-template-columns:minmax(0,3fr) minmax(135px,1fr);grid-template-rows:repeat(2,minmax(0,1fr));gap:10px}
body.presentation-mode .layout .tiles.presentation-tiles .tile{min-height:0;min-width:0;flex:none!important;grid-column:2;grid-row:auto}
body.presentation-mode .layout .tiles.presentation-tiles .tile.screen{grid-column:1;grid-row:1 / -1;box-shadow:0 0 0 1px #ffffff55}
body.presentation-mode .layout .tiles.presentation-tiles .tile.screen video{object-fit:contain}
@media(max-width:760px){body.presentation-mode .layout .tiles.presentation-tiles{grid-template-columns:1fr 1fr;grid-template-rows:minmax(0,3fr) minmax(80px,1fr)}body.presentation-mode .layout .tiles.presentation-tiles .tile.screen{grid-column:1/-1;grid-row:1}body.presentation-mode .layout .tiles.presentation-tiles .tile:not(.screen){grid-row:2;grid-column:auto}body.presentation-mode .presentation-switch{font-size:11px;padding:7px}}


/* v52 — Video-first layout when the shared Canvas is closed.
   The remote participant fills the stage; the local camera floats in the
   upper-right corner. Opening the Canvas restores the existing v37 layout. */
.layout:not(.canvas-open) .tiles.video-call-layout{
  display:block!important;
  padding:0!important;
  gap:0!important;
  overflow:hidden;
}
.layout:not(.canvas-open) .tiles.video-call-layout > .remote-camera-tile{
  position:absolute!important;
  inset:0!important;
  width:auto!important;
  height:auto!important;
  min-width:0!important;
  min-height:0!important;
  flex:none!important;
  border-radius:14px!important;
  z-index:1;
}
.layout:not(.canvas-open) .tiles.video-call-layout > .remote-camera-tile video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.layout:not(.canvas-open) .tiles.video-call-layout > .local-camera-tile{
  position:absolute!important;
  top:18px!important;
  right:18px!important;
  bottom:auto!important;
  left:auto!important;
  width:clamp(118px,22vw,270px)!important;
  height:auto!important;
  aspect-ratio:16/9;
  min-width:0!important;
  min-height:0!important;
  flex:none!important;
  border:2px solid rgba(255,255,255,.92)!important;
  border-radius:13px!important;
  box-shadow:0 10px 30px rgba(0,0,0,.35)!important;
  z-index:5!important;
}
.layout:not(.canvas-open) .tiles.video-call-layout > .local-camera-tile video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.layout:not(.canvas-open) .tiles.video-call-layout > .local-camera-tile .tile-label{
  left:7px;
  bottom:7px;
  padding:4px 7px;
  font-size:10px;
}
.layout:not(.canvas-open) .tiles.video-call-layout > .local-camera-tile .tile-status{
  right:7px;
  bottom:7px;
  gap:3px;
}
.layout:not(.canvas-open) .tiles.video-call-layout > .local-camera-tile .tile-status span{
  width:25px;
  height:25px;
  min-width:25px;
  padding:3px;
  border-radius:7px;
}
.layout:not(.canvas-open) .tiles.video-call-layout > .local-camera-tile .participant-signal{
  transform:scale(.82);
  transform-origin:top right;
}
.layout:not(.canvas-open) .meeting-head{
  position:absolute;
  z-index:16;
  top:22px;
  left:24px;
  right:24px;
  justify-content:flex-start;
  pointer-events:none;
}
.layout:not(.canvas-open) .meeting-head h1{display:none}
.layout:not(.canvas-open) .meeting-head #canvasToggle{
  pointer-events:auto;
  background:rgba(12,22,36,.68);
  color:#fff;
  border:1px solid rgba(255,255,255,.22);
  border-radius:10px;
  padding:8px 12px;
  backdrop-filter:blur(12px);
}
@media(max-width:600px){
  .layout:not(.canvas-open) .tiles.video-call-layout > .local-camera-tile{
    top:12px!important;
    right:12px!important;
    width:clamp(112px,34vw,175px)!important;
    border-radius:10px!important;
  }
  .layout:not(.canvas-open) .meeting-head{top:12px;left:12px;right:12px}
  .layout:not(.canvas-open) .callbar{bottom:10px}
}


/* v55 — professional interaction polish; preserve v37 classroom geometry */
.quality-status{
  appearance:none;
  font:inherit;
  font-size:11px;
  background:var(--panel);
  cursor:pointer;
  transition:border-color .18s ease,background .18s ease,transform .18s ease;
}
.quality-status:hover{border-color:var(--accent);background:var(--soft)}
.quality-status:active{transform:scale(.98)}
.quality-status:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.tile{transition:border-radius .22s ease,box-shadow .22s ease,opacity .2s ease,transform .22s ease}
.tile video{opacity:1;transition:opacity .24s ease,filter .24s ease}
.tile video.media-track{opacity:0}
.tile video.media-track.media-ready{opacity:1}
.stage,.canvas-panel,.canvas-area,.toolbar-v37,.callbar{transition:border-color .2s ease,box-shadow .2s ease,background-color .2s ease}
.layout:not(.canvas-open) .tiles.video-call-layout>.local-camera-tile{transition:width .22s ease,top .22s ease,right .22s ease,box-shadow .22s ease}
.presentation-switch{transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease}
.presentation-switch:hover{transform:translateY(-1px)}
.toolbar-v37 .tool-group button,.toolbar-v37 select,.toolbar-v37 .upload-btn{transition:background .16s ease,border-color .16s ease,color .16s ease}
.toolbar-v37 .tool-group button:hover,.toolbar-v37 .upload-btn:hover{border-color:var(--accent)}
.canvas-area:focus-within{border-color:color-mix(in srgb,var(--accent) 65%,#dfe5ec);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 10%,transparent)}
.editor{caret-color:#168b80;line-height:1.7;letter-spacing:0}
.editor p{margin:.45em 0}
.editor h1,.editor h2,.editor h3{line-height:1.25;letter-spacing:-.025em}
.editor img{transition:box-shadow .18s ease}
.word-image-frame{filter:drop-shadow(0 2px 5px #0002)}
.callbar .control,.device-block select{transition:background .16s ease,border-color .16s ease,transform .16s ease}
.callbar .control:hover:not(:disabled),.device-block select:hover{border-color:var(--accent)}
.callbar .control:active:not(:disabled){transform:scale(.97)}
html[data-theme=dark] .toolbar-v37{background:#172335;border-color:#2b3b50;box-shadow:0 5px 18px #0002}
html[data-theme=dark] .toolbar-v37 .tool-group{border-color:#2b3b50}
html[data-theme=dark] .canvas-panel{background:#121e2e}
html[data-theme=dark] .canvas-head{color:var(--ink)}
html[data-theme=dark] .canvas-area{background:#fff;border-color:#33445a;box-shadow:0 5px 20px #0002}
html[data-theme=dark] .canvas-area:focus-within{border-color:#60d0bf;box-shadow:0 0 0 3px #60d0bf20}
.diagnostics-dialog{width:min(620px,calc(100vw - 28px));max-width:620px;padding:22px;background:var(--panel);color:var(--ink)}
.diagnostics-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:18px}
.diagnostics-head h2{margin:0 0 5px;font-size:19px}
.diagnostics-head p{margin:0;color:var(--muted);font-size:12px}
.diagnostics-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
.diagnostics-grid>div{display:flex;flex-direction:column;gap:5px;min-width:0;padding:11px 12px;border:1px solid var(--line);border-radius:11px;background:color-mix(in srgb,var(--panel) 90%,var(--bg))}
.diagnostics-grid span{font-size:10px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.055em}
.diagnostics-grid strong{font-size:12px;font-weight:650;overflow-wrap:anywhere}
.diagnostics-note{margin:14px 0 0;color:var(--muted);font-size:11px;line-height:1.5}
@media(max-width:520px){.diagnostics-dialog{padding:16px}.diagnostics-grid{grid-template-columns:1fr}.diagnostics-grid>div{padding:9px 11px}}
@media(prefers-reduced-motion:reduce){.tile,.tile video,.stage,.canvas-panel,.canvas-area,.toolbar-v37,.callbar,.quality-status,.presentation-switch{transition:none!important;animation:none!important}}


/* v58 — neural anatomy artwork and restrained connection animation on homepage.
   Existing classroom, video and Canvas CSS remain unchanged. */
.home-join-status{min-height:24px;margin:13px 0 0;color:var(--muted);font:600 12px/1.6 system-ui,sans-serif;letter-spacing:.015em}
.home-screen.joining-lesson .enter-lesson-btn{opacity:.7;cursor:progress;box-shadow:0 8px 20px #168b8030}
.home-screen.joining-lesson .enter-arrow{animation:brainStatusPulse 1.5s ease-in-out infinite}
.home-art-anatomy{min-height:500px;overflow:visible}
.home-art-anatomy .home-art-glow{width:105%;background:radial-gradient(circle at 51% 46%,rgba(84,64,153,.18),rgba(29,110,125,.09) 46%,transparent 73%)}
.brain-art-halo{position:absolute;z-index:0;top:50%;left:49%;width:min(77%,380px);aspect-ratio:1;transform:translate(-50%,-50%);border:1px solid rgba(120,137,218,.23);border-radius:50%;box-shadow:0 0 0 22px rgba(112,120,202,.035),0 0 0 58px rgba(112,120,202,.025);pointer-events:none}
.brain-art-frame{position:absolute;z-index:3;top:50%;left:49%;width:min(56%,265px);height:min(455px,94%);transform:translate(-50%,-50%);overflow:hidden;border-radius:20px;background:#030305;border:1px solid rgba(168,171,215,.48);box-shadow:0 26px 80px #0008,0 0 35px rgba(97,83,169,.12);isolation:isolate;pointer-events:none}
.brain-art-frame img{position:absolute;display:block;left:0;top:-11%;width:100%;height:130%;object-fit:cover;object-position:50% 53%;filter:contrast(1.12) saturate(1.12);transform:translateZ(0)}
.brain-art-frame::before{content:'';position:absolute;z-index:2;inset:0;border-radius:inherit;box-shadow:inset 0 0 32px rgba(0,0,0,.52),inset 0 0 0 1px rgba(255,255,255,.08);pointer-events:none}
.brain-art-scan{position:absolute;z-index:2;inset:0;background:linear-gradient(180deg,transparent 0%,transparent 42%,rgba(109,207,216,.15) 49%,rgba(182,164,255,.26) 50%,rgba(109,207,216,.12) 51%,transparent 58%,transparent 100%);background-size:100% 210%;mix-blend-mode:screen;opacity:.75;animation:brainSweep 8s ease-in-out infinite alternate;pointer-events:none}
.brain-art-line{position:absolute;z-index:2;bottom:0;left:0;width:43%;height:2px;background:linear-gradient(90deg,transparent,#7dceef,#c7afff);box-shadow:0 0 12px rgba(147,201,241,.75);animation:brainLineSweep 6s ease-in-out infinite alternate}
.brain-art-loading{display:none;position:absolute;inset:0;z-index:5;align-items:center;justify-content:center;background:rgba(2,4,12,.24);backdrop-filter:blur(1px)}
.home-screen.joining-lesson .brain-art-loading{display:flex}
.brain-loading-ring{display:block;width:62px;height:62px;border-radius:50%;border:3px solid rgba(176,187,225,.19);border-top-color:#b9c6ff;border-right-color:#77d8d4;box-shadow:0 0 22px rgba(119,216,212,.16);animation:brainRingSpin 1.1s linear infinite}
.home-art-anatomy .anatomy-art-main{z-index:2;height:min(286px,63%);left:0;top:38%;transform:translateY(-50%) rotate(-9deg);border-width:5px}
.home-art-anatomy .anatomy-art-heart{z-index:4;height:min(245px,51%);right:-1%;bottom:3%;transform:rotate(7deg);border-width:5px}
.home-art-anatomy:hover .anatomy-art-main{transform:translateY(-50%) rotate(-7deg)}
.home-art-anatomy:hover .anatomy-art-heart{transform:translateY(-4px) rotate(5deg)}
.home-art-anatomy .home-art-badge{z-index:6;bottom:-8px}
@keyframes brainSweep{0%{background-position:0% 0%}100%{background-position:0% 100%}}
@keyframes brainLineSweep{0%{transform:translateX(-100%);opacity:.24}100%{transform:translateX(255%);opacity:.75}}
@keyframes brainRingSpin{to{transform:rotate(360deg)}}
@keyframes brainStatusPulse{50%{background:rgba(255,255,255,.45);transform:scale(1.06)}}
@media(max-width:800px){
 .home-art-anatomy{min-height:400px;margin-top:8px}
 .brain-art-frame{height:min(360px,94%);width:min(50%,210px);left:50%}
 .brain-art-halo{left:50%;width:min(75%,330px)}
 .home-art-anatomy .anatomy-art-main{height:235px;left:11%;top:37%}
 .home-art-anatomy .anatomy-art-heart{height:200px;right:10%;bottom:2%}
}
@media(max-width:480px){
 .home-art-anatomy{min-height:332px;margin-top:0}
 .brain-art-frame{height:305px;width:172px;left:51%;border-radius:15px}
 .brain-art-halo{left:51%;width:265px}
 .home-art-anatomy .anatomy-art-main{height:186px;left:0;top:36%;border-width:4px}
 .home-art-anatomy .anatomy-art-heart{height:164px;right:0;bottom:0;border-width:4px}
 .home-art-anatomy .home-art-badge{font-size:8px;padding:8px 10px;bottom:-2px}
}
@media(prefers-reduced-motion:reduce){.brain-art-scan,.brain-art-line,.brain-loading-ring,.home-screen.joining-lesson .enter-arrow{animation:none!important}}


/* v59 — keep the two original anatomy images intact and add the brain as a
   separate larger feature element on the right/lower side of the homepage. */
.home-art-anatomy{min-height:520px}
.anatomy-art-main{
  width:min(46%,250px);
  height:min(430px,calc(100% - 42px));
  left:4%;
  top:9%;
  transform:rotate(-5deg);
}
.anatomy-art-heart{
  width:min(38%,210px);
  height:min(330px,68%);
  left:28%;
  bottom:5%;
  right:auto;
  transform:rotate(6deg);
  border-width:6px;
}
.home-art-anatomy:hover .anatomy-art-main{transform:translateY(-4px) rotate(-2deg)}
.home-art-anatomy:hover .anatomy-art-heart{transform:translateY(-4px) rotate(3deg)}

.brain-art-halo{
  position:absolute;
  z-index:0;
  right:2%;
  top:10%;
  width:min(62%,360px);
  aspect-ratio:0.72/1;
  border-radius:36px;
  background:
    radial-gradient(circle at 45% 45%, color-mix(in srgb,var(--accent) 22%, transparent), transparent 56%),
    radial-gradient(circle at 80% 30%, rgba(84,132,255,.22), transparent 40%),
    radial-gradient(circle at 25% 78%, rgba(179,78,255,.18), transparent 34%);
  filter:blur(8px);
  opacity:.9;
}
.brain-art-feature{
  z-index:3;
  right:0;
  left:auto;
  top:6%;
  width:min(60%,350px);
  height:min(470px,92%);
  border-radius:34px;
  border:1px solid rgba(255,255,255,.18);
  background:rgba(7,11,18,.76);
  box-shadow:
    0 26px 60px rgba(0,0,0,.40),
    0 0 0 1px rgba(255,255,255,.06) inset;
  overflow:hidden;
}
.brain-art-feature img{
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center;
  display:block;
}
.brain-art-scan{
  position:absolute;
  inset:auto 0 20% 0;
  height:24%;
  background:linear-gradient(180deg, transparent 0%, rgba(118,194,255,.12) 46%, rgba(154,230,255,.42) 50%, rgba(118,194,255,.12) 54%, transparent 100%);
  mix-blend-mode:screen;
  animation:brainScanSweep 5.5s ease-in-out infinite;
  pointer-events:none;
}
.brain-art-line{
  position:absolute;
  top:0;
  bottom:0;
  width:2px;
  background:linear-gradient(180deg, transparent, rgba(255,255,255,.85), transparent);
  box-shadow:0 0 14px rgba(133,214,255,.85);
  opacity:.55;
  animation:brainLineSweep 4.8s ease-in-out infinite;
}
.brain-art-loading{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  background:radial-gradient(circle, rgba(5,10,18,.18) 0%, rgba(5,10,18,.08) 42%, rgba(5,10,18,0) 70%);
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease;
}
.home-screen.joining-lesson .brain-art-feature .brain-art-loading{opacity:1;visibility:visible}
.brain-loading-ring{
  width:70px;
  height:70px;
  border-radius:999px;
  border:3px solid rgba(255,255,255,.14);
  border-top-color:#9ae6ff;
  border-right-color:#b764ff;
  box-shadow:0 0 25px rgba(133,214,255,.18);
  animation:brainRingSpin .95s linear infinite;
}
@keyframes brainScanSweep{
  0%,100%{transform:translateY(34%)}
  50%{transform:translateY(-128%)}
}
@keyframes brainLineSweep{
  0%,100%{left:14%;opacity:.20}
  50%{left:84%;opacity:.75}
}
@keyframes brainRingSpin{to{transform:rotate(1turn)}}

@media (max-width: 980px){
  .home-art-anatomy{min-height:470px}
  .anatomy-art-main{width:min(43%,220px);left:3%;top:12%}
  .anatomy-art-heart{width:min(34%,180px);left:24%;bottom:4%}
  .brain-art-feature{width:min(58%,300px);height:min(420px,92%);right:1%}
  .brain-art-halo{width:min(60%,300px)}
}
@media (max-width: 800px){
  .home-art-anatomy{min-height:420px}
  .anatomy-art-main{width:39%;height:78%;top:14%}
  .anatomy-art-heart{width:31%;height:58%;left:23%;bottom:5%}
  .brain-art-feature{width:52%;height:85%;right:1%;top:8%;border-radius:26px}
  .brain-art-halo{width:54%;top:13%}
}
@media (max-width: 560px){
  .home-art-anatomy{min-height:360px}
  .anatomy-art-main{width:37%;height:72%;left:3%;top:16%;border-width:4px}
  .anatomy-art-heart{width:29%;height:52%;left:21%;bottom:7%;border-width:4px}
  .brain-art-feature{width:50%;height:80%;right:0;top:10%;border-radius:22px}
  .brain-art-halo{width:54%;top:18%}
  .brain-loading-ring{width:54px;height:54px}
}


/* v61 homepage polish */
.home-screen{
  overflow:hidden;
}
.home-copy > *{
  opacity:0;
  transform:translateY(18px);
  animation:homeFadeUp .78s cubic-bezier(.2,.8,.2,1) forwards;
}
.home-copy .home-brand-lockup{animation-delay:.05s}
.home-copy h1{animation-delay:.12s}
.home-copy .home-subtitle{animation-delay:.20s}
.home-copy .home-welcome{animation-delay:.28s}
.home-copy .enter-lesson-btn{animation-delay:.36s}
.home-copy .home-join-status{animation-delay:.44s}
.home-art{
  animation:homeArtReveal 1s cubic-bezier(.2,.8,.2,1) .16s both;
}
@keyframes homeFadeUp{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:none}
}
@keyframes homeArtReveal{
  from{opacity:0;transform:translateY(26px) scale(.985)}
  to{opacity:1;transform:none}
}

.enter-lesson-btn{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  padding:0;
  min-width:min(100%,320px);
}
.enter-button-content{
  position:relative;
  z-index:2;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding:16px 18px 16px 20px;
  width:100%;
}
.enter-button-copy{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:2px;
}
.enter-label-main{
  font:700 18px/1.2 system-ui,sans-serif;
}
.enter-label-sub{
  font:600 12px/1.2 system-ui,sans-serif;
  color:rgba(255,255,255,.78);
  letter-spacing:.01em;
}
.enter-button-status{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-width:44px;
}
.enter-button-shine{
  position:absolute;
  inset:0 auto 0 -32%;
  width:38%;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.16),transparent);
  transform:skewX(-22deg);
  transition:transform .6s ease;
  z-index:1;
}
.enter-lesson-btn:hover .enter-button-shine{
  transform:translateX(270%) skewX(-22deg);
}
.enter-spinner{
  width:18px;
  height:18px;
  border-radius:999px;
  border:2px solid rgba(255,255,255,.20);
  border-top-color:#fff;
  opacity:0;
  transform:scale(.85);
  transition:opacity .18s ease,transform .18s ease;
}
.enter-arrow{
  transition:transform .18s ease,opacity .18s ease;
}
.enter-lesson-btn:hover .enter-arrow{transform:translateX(2px)}
.home-screen.joining-lesson .enter-lesson-btn{
  opacity:1;
  cursor:progress;
}
.home-screen.joining-lesson .enter-spinner{
  opacity:1;
  transform:scale(1);
  animation:enterSpin .9s linear infinite;
}
.home-screen.joining-lesson .enter-arrow{
  opacity:0;
  transform:translateX(6px) scale(.9);
}
@keyframes enterSpin{to{transform:rotate(360deg)}}

#brainArtFeature{
  will-change:transform;
  transform-style:preserve-3d;
  transition:transform .22s ease, box-shadow .22s ease;
}
#brainArtFeature img,
#brainArtFeature .brain-art-line,
#brainArtFeature .brain-art-scan,
#brainArtFeature .brain-pulse{
  transform:translateZ(0);
}
.brain-pulse{
  position:absolute;
  width:110px;
  height:110px;
  border-radius:999px;
  filter:blur(2px);
  opacity:.22;
  mix-blend-mode:screen;
  animation:neuralPulse 4.8s ease-in-out infinite;
  pointer-events:none;
}
.brain-pulse::before{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  background:radial-gradient(circle, rgba(140,214,255,.95) 0%, rgba(140,214,255,.18) 42%, rgba(140,214,255,0) 74%);
}
.brain-pulse-one{left:13%; top:22%; animation-delay:0s}
.brain-pulse-two{right:14%; top:35%; width:88px; height:88px; animation-delay:1.2s}
.brain-pulse-three{left:30%; bottom:15%; width:96px; height:96px; animation-delay:2.4s}
@keyframes neuralPulse{
  0%,100%{opacity:.10; transform:scale(.82)}
  45%{opacity:.28; transform:scale(1.02)}
  60%{opacity:.18; transform:scale(.94)}
}
.home-screen:not(.joining-lesson) .brain-art-loading{
  opacity:0;
}
.home-screen.joining-lesson .brain-art-loading{
  opacity:1;
}
.home-screen.joining-lesson #brainArtFeature{
  box-shadow:0 30px 74px rgba(0,0,0,.44), 0 0 0 1px rgba(255,255,255,.06) inset, 0 0 36px rgba(124,220,255,.10);
}
@media (max-width: 700px){
  .enter-button-content{
    padding:15px 16px 15px 18px;
  }
  .enter-label-main{font-size:17px}
}
@media (prefers-reduced-motion: reduce){
  .home-copy > *, .home-art{
    animation:none !important;
    opacity:1 !important;
    transform:none !important;
  }
  .enter-button-shine,
  .brain-pulse,
  .enter-spinner,
  .brain-art-line,
  .brain-art-scan{
    animation:none !important;
  }
  #brainArtFeature{
    transform:none !important;
  }
}


/* v63 — reliable, visible premium homepage motion (all layout dimensions unchanged). */
/* Entrance animations run when the homepage loads. No content is hidden if JS fails. */
.home-copy > *{
  animation-name:aliHomeEntrance !important;
  animation-duration:1.15s !important;
  animation-timing-function:cubic-bezier(.18,.72,.26,1) !important;
  animation-fill-mode:both !important;
}
.home-copy .home-brand-lockup{animation-delay:.08s !important}
.home-copy h1{animation-delay:.20s !important}
.home-copy .home-subtitle{animation-delay:.31s !important}
.home-copy .home-welcome{animation-delay:.42s !important}
.home-copy .enter-lesson-btn{animation-delay:.52s !important}
.home-copy .home-join-status{animation-delay:.57s !important}
.home-art{
  animation:aliHomeArtReveal 1.45s cubic-bezier(.18,.75,.25,1) .22s both !important;
}
@keyframes aliHomeEntrance{
  0%{opacity:0;transform:translateY(30px);filter:blur(5px)}
  45%{opacity:.62;filter:blur(1px)}
  100%{opacity:1;transform:translateY(0);filter:blur(0)}
}
@keyframes aliHomeArtReveal{
  0%{opacity:0;transform:translateY(28px) scale(.95);filter:blur(5px)}
  100%{opacity:1;transform:translateY(0) scale(1);filter:blur(0)}
}

/* The actual image card must keep its existing translate(-50%,-50%) placement. */
#brainArtFeature{
  transform:translate(-50%,-50%) perspective(1300px) rotateX(var(--brain-tilt-x,0deg)) rotateY(var(--brain-tilt-y,0deg));
  transform-style:preserve-3d;
  transform-origin:50% 50%;
  transition:transform .2s ease-out,box-shadow .24s ease;
  will-change:transform;
}

/* Three quiet neural firing points, bright enough to actually be perceptible. */
#brainArtFeature .brain-pulse{
  z-index:4;
  display:block;
  width:12px;
  height:12px;
  border-radius:50%;
  background:radial-gradient(circle at 40% 38%,#f4ffff 0%,#a2edff 42%,#6f91ff 90%);
  filter:none;
  mix-blend-mode:screen;
  box-shadow:0 0 13px 3px rgba(126,224,255,.65), 0 0 32px 11px rgba(90,141,248,.19);
  opacity:.66;
  animation:aliNeuralFire 3.9s ease-in-out infinite;
  pointer-events:none;
}
#brainArtFeature .brain-pulse::before{
  content:'';
  position:absolute;
  left:50%;top:50%;
  width:72px;height:72px;
  transform:translate(-50%,-50%);
  border-radius:50%;
  background:radial-gradient(circle,rgba(152,229,255,.56) 0%,rgba(126,163,255,.16) 34%,transparent 72%);
  filter:blur(3px);
}
#brainArtFeature .brain-pulse::after{
  content:'';
  position:absolute;
  left:50%;top:50%;
  width:32px;height:32px;
  border-radius:50%;
  border:1px solid rgba(170,236,255,.68);
  transform:translate(-50%,-50%) scale(.45);
  opacity:0;
  animation:aliNeuralRing 3.9s ease-out infinite;
}
#brainArtFeature .brain-pulse-one{left:31%;top:26%;animation-delay:0s}
#brainArtFeature .brain-pulse-two{left:69%;top:34%;animation-delay:1.25s;background:radial-gradient(circle at 40% 38%,#fff 0%,#d7a5ff 44%,#9479fb 90%)}
#brainArtFeature .brain-pulse-three{left:44%;top:44%;animation-delay:2.5s}
#brainArtFeature .brain-pulse-one::after{animation-delay:0s}
#brainArtFeature .brain-pulse-two::after{animation-delay:1.25s}
#brainArtFeature .brain-pulse-three::after{animation-delay:2.5s}
@keyframes aliNeuralFire{
  0%,100%{opacity:.25;transform:scale(.62)}
  32%{opacity:1;transform:scale(1.45)}
  60%{opacity:.55;transform:scale(.9)}
}
@keyframes aliNeuralRing{
  0%,12%{opacity:0;transform:translate(-50%,-50%) scale(.4)}
  30%{opacity:.72;transform:translate(-50%,-50%) scale(1)}
  60%,100%{opacity:0;transform:translate(-50%,-50%) scale(2.5)}
}
/* Reduced-motion users keep a static, accessible layout. The existing
   connecting spinner and functional UI remain unchanged. */
@media (prefers-reduced-motion: reduce){
 .home-copy > *, .home-art{
  animation:none !important;
  opacity:1 !important;
  transform:none !important;
  filter:none !important;
 }
 #brainArtFeature{transform:translate(-50%,-50%) !important;transition:none !important}
 #brainArtFeature .brain-pulse,
 #brainArtFeature .brain-pulse::after{animation:none !important;opacity:.45 !important}
}

/* Keep the neural artwork clear of Enter Lesson on narrow phone screens. */
@media (max-width:700px){
 #brainArtFeature{
  transform:translate(-50%,-10%) perspective(1300px) rotateX(var(--brain-tilt-x,0deg)) rotateY(var(--brain-tilt-y,0deg));
 }
}
@media (max-width:700px) and (prefers-reduced-motion:reduce){
 #brainArtFeature{transform:translate(-50%,-10%) !important}
}


/* v64 — force homepage effects to remain available when OS reduced-motion is set.
   The user asked for these effects; they are slow, subtle, and confined to the homepage. */
@media (prefers-reduced-motion: reduce){
  .home-copy > *{
    animation:aliHomeEntrance 1.15s cubic-bezier(.18,.72,.26,1) both !important;
    opacity:1 !important;
    filter:none;
  }
  .home-art{
    animation:aliHomeArtReveal 1.45s cubic-bezier(.18,.75,.25,1) .12s both !important;
    opacity:1 !important;
  }
  #brainArtFeature{
    transition:transform .22s ease-out,box-shadow .24s ease !important;
    transform:translate(-50%,-50%) perspective(1300px) rotateX(var(--brain-tilt-x,0deg)) rotateY(var(--brain-tilt-y,0deg)) !important;
    pointer-events:auto !important;
  }
  #brainArtFeature .brain-pulse{
    animation:aliNeuralFire 3.9s ease-in-out infinite !important;
    opacity:.7 !important;
  }
  #brainArtFeature .brain-pulse::after{
    animation:aliNeuralRing 3.9s ease-out infinite !important;
  }
}
#brainArtFeature{pointer-events:auto !important}

/* v73: The local self-view mirror is applied on .camera-display-layer (see below). */

/* v65 — draw overlay covers the entire scrollable canvas document, including uploaded images. */
.canvas-area canvas{z-index:10}
.lesson-preview-image{
 display:flex;align-items:center;justify-content:center;
 width:100%;height:34px;margin:4px 0;
 border:1px dashed #aeb9c5;border-radius:4px;
 background:#eef2f5;color:#667586;font-size:10px;font-weight:600;
}

/* v66: collaborator markers follow the scrolled lesson document. */
.remote-cursors{overflow:visible;width:100%;min-height:100%;pointer-events:none}

/* v67: reliable text-formatting selection feedback; no layout changes. */
.tool-text button[data-format].active,.tool-more button.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.tool-text button[data-format]:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* v73: remote camera and screen share remain in their original orientation. */
.tile.remote-camera-tile video,.tile.screen video{transform:none!important}


/* v72 — camera mirroring is on its own display layer. It applies after the
   LiveKit video element is attached, regardless of browser video rendering.
   Never mirror a screen presentation or the controls/labels on the camera tile. */
.tile .camera-display-layer{
  position:absolute;inset:0;width:100%;height:100%;
  overflow:hidden;border-radius:inherit;z-index:0;
  transform-origin:50% 50%;
}
.tile.local-camera-tile.camera-mirror-active .camera-display-layer{
  transform:none !important;
}
.tile .camera-display-layer video{
  display:block;width:100%;height:100%;object-fit:cover;
  transform:none !important;
}
/* v75: reverse the v74 self-view orientation (right hand appears screen-left).
   The local video has no flip; tutor and screen share remain unchanged. */
#local-camera .camera-display-layer video{
  transform:none !important;
  transform-origin:center center;
}

/* v72 — one unambiguous glowing vertical trace and horizontal scan, with
   explicit animations even when Windows advertises Reduced Motion. Earlier
   CSS used conflicting brainLineSweep keyframes and disabled these effects. */
.home-screen #brainArtFeature .brain-art-line{
  position:absolute;z-index:3;top:0;bottom:auto;right:auto;
  left:0;width:3px;height:100%;
  background:linear-gradient(180deg,transparent 3%,rgba(178,238,255,.78) 30%,#e5fbff 50%,rgba(153,185,255,.85) 70%,transparent 97%);
  box-shadow:0 0 12px 2px rgba(138,211,255,.55);
  opacity:.8;transform:none;
  animation:aliV72LightSweep 5.2s linear infinite !important;
  animation-play-state:running !important;
  pointer-events:none;
}
.home-screen #brainArtFeature .brain-art-scan{
  position:absolute;z-index:2;inset:0;
  width:100%;height:100%;
  background:linear-gradient(180deg,transparent 33%,rgba(120,200,255,.06) 46%,rgba(175,231,255,.36) 50%,rgba(120,200,255,.06) 54%,transparent 68%);
  background-size:100% 220%;
  mix-blend-mode:screen;opacity:.72;
  transform:none !important;
  animation:aliV72ScanSweep 6.7s linear infinite !important;
  animation-play-state:running !important;
  pointer-events:none;
}
@keyframes aliV72LightSweep{
  0%{left:-3px;opacity:.18}
  12%{opacity:.8}
  85%{opacity:.8}
  100%{left:100%;opacity:.18}
}
@keyframes aliV72ScanSweep{
  0%{background-position:0% 0%}
  100%{background-position:0% 100%}
}


/* v76 — preserve the FULL local webcam frame instead of cropping it to fill
   a tile with a different aspect ratio. Keep v75's proven horizontal orientation. */
#local-camera .camera-display-layer{background:#0b1420}
#local-camera .camera-display-layer video{
  object-fit:contain !important;
  object-position:center center !important;
  transform:none !important;
}