:root{--navy-900:#081227;--navy-800:#0b1730;--navy-700:#12234a;--navy-600:#1b3163;--navy-line:#ffffff14;--surface:#fff;--surface-2:#f4f7fc;--surface-3:#e9eef8;--line:#dfe5f0;--ink:#14213d;--ink-2:#4a5878;--ink-3:#7b88a6;--on-navy:#e8eefc;--on-navy-2:#9fb0d6;--blue:#1f6fff;--blue-600:#155ee0;--blue-50:#e8f0ff;--red:#e5383b;--red-50:#fdecec;--green:#1fbf75;--amber:#f5a524;--radius:14px;--radius-sm:10px;--shadow:0 8px 24px #0812272e;--shadow-sm:0 2px 8px #08122714;--tap:44px;color:var(--ink);-webkit-text-size-adjust:100%;font-family:Inter,Segoe UI,system-ui,-apple-system,BlinkMacSystemFont,Roboto,Noto Sans,Ubuntu,Cantarell,Helvetica Neue,Arial,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--navy-800);font-size:15px;line-height:1.45}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}:focus-visible{outline-offset:2px;outline:3px solid #7fb0ff}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.btn{min-height:var(--tap);border-radius:var(--radius-sm);background:var(--blue);color:#fff;border:1px solid #0000;justify-content:center;align-items:center;gap:8px;padding:0 18px;font-weight:600;text-decoration:none;transition:background .15s,transform 50ms;display:inline-flex}.btn:hover{background:var(--blue-600)}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn.ghost{color:var(--blue);border-color:var(--line);background:0 0}.btn.ghost:hover{background:var(--blue-50)}.btn.danger{background:var(--red)}.btn.danger:hover{background:#c92d30}.btn.small{min-height:34px;padding:0 12px;font-size:14px}.btn.on-navy{color:var(--on-navy);border-color:var(--navy-line);background:0 0}.field{gap:6px;margin-bottom:14px;display:grid}.field label{color:var(--ink-2);font-size:14px;font-weight:600}.input{min-height:var(--tap);border-radius:var(--radius-sm);border:1px solid var(--line);background:#fff;width:100%;padding:0 14px}textarea.input{min-height:80px;padding:10px 14px}.input:focus{border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-50);outline:none}.error-text{color:var(--red);margin:6px 0;font-size:14px}.muted{color:var(--ink-3)}.center-page{background:url(/icon-field.svg) center / 420px 420px repeat, radial-gradient(1200px 600px at 10% -10%, #1d3a7a 0%, transparent 60%), var(--navy-800);place-items:center;min-height:100%;padding:24px 16px;display:grid}.card{background:var(--surface);box-shadow:var(--shadow);border-radius:18px;width:100%;max-width:420px;padding:28px}.brand{letter-spacing:-.01em;align-items:center;gap:10px;font-size:22px;font-weight:800;display:flex}.brand img{width:34px;height:34px}.brand small{letter-spacing:.04em;color:var(--on-navy-2);font-size:12px;font-weight:500;display:block}.card .brand{color:var(--ink);margin-bottom:18px}.card h1{margin:0 0 6px;font-size:22px}.shell{grid-template-columns:240px 1fr;height:100%;display:grid}.sidebar{background:linear-gradient(180deg, var(--navy-900), var(--navy-800));color:var(--on-navy);border-right:1px solid var(--navy-line);flex-direction:column;gap:18px;padding:20px 14px;display:flex}.nav{gap:4px;display:grid}.nav a,.nav button{min-height:var(--tap);color:var(--on-navy-2);text-align:left;background:0 0;border:0;border-radius:12px;align-items:center;gap:12px;padding:0 14px;font-weight:500;text-decoration:none;display:flex}.nav a:hover,.nav button:hover{color:var(--on-navy);background:#ffffff0f}.nav a.active{background:var(--blue);color:#fff}.nav .soon{background:#ffffff14;border-radius:99px;margin-left:auto;padding:2px 8px;font-size:11px}.content{background:var(--surface-2);overflow:auto}.page{max-width:1100px;margin:0 auto;padding:28px 24px 60px}.page h1{margin:0 0 4px;font-size:26px}.grid-cards{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:20px;display:grid}.class-card{background:var(--surface);border-radius:var(--radius);border:1px solid var(--line);box-shadow:var(--shadow-sm);gap:12px;padding:18px;display:grid}.class-card h3{margin:0;font-size:18px}.row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.invite-box{gap:6px;display:flex}.invite-box input{background:var(--surface-2);flex:1;min-width:0;font-size:13px}.mobile-top,.mobile-menu{display:none}.classroom{background:radial-gradient(1000px 500px at 0% 0%, #17306a 0%, transparent 55%), var(--navy-800);height:100%;color:var(--on-navy);grid-template-rows:60px minmax(0,1fr) 72px;grid-template-columns:minmax(0,1fr);display:grid}.class-top{border-bottom:1px solid var(--navy-line);align-items:center;gap:14px;min-width:0;padding:0 18px;display:flex}.class-top .title{white-space:nowrap;text-overflow:ellipsis;font-weight:600;overflow:hidden}.pill{border:1px solid var(--navy-line);white-space:nowrap;border-radius:99px;align-items:center;gap:8px;padding:6px 12px;font-size:13px;display:inline-flex}.dot{background:var(--green);border-radius:50%;width:9px;height:9px;display:inline-block}.dot.red{background:var(--red)}.dot.amber{background:var(--amber)}.class-body{grid-template-columns:minmax(0,1fr) 360px;gap:14px;min-height:0;padding:12px 14px;display:grid}.class-main{grid-template-rows:auto minmax(0,1fr);gap:12px;min-width:0;min-height:0;display:grid}.video-strip{scrollbar-width:thin;gap:10px;padding-bottom:2px;display:flex;overflow-x:auto}.tile{aspect-ratio:16/10;background:var(--navy-700);border:2px solid #0000;border-radius:12px;flex:none;width:176px;position:relative;overflow:hidden}.tile.speaking{border-color:var(--green);box-shadow:0 0 0 3px #1fbf7540}.tile video{object-fit:cover;width:100%;height:100%;display:block}.tile .avatar{color:#fff;place-items:center;font-size:30px;font-weight:700;display:grid;position:absolute;top:0;bottom:0;left:0;right:0}.tile .label{align-items:center;gap:6px;font-size:12.5px;font-weight:600;display:flex;position:absolute;bottom:6px;left:6px;right:6px}.tile .label span.name{white-space:nowrap;text-overflow:ellipsis;background:#081227b8;border-radius:7px;padding:3px 8px;overflow:hidden}.tile .muted-badge{background:#e5383be6;border-radius:7px;margin-left:auto;padding:2px 6px}.tile .hand{font-size:20px;position:absolute;top:6px;right:6px}.stage{background:var(--surface);color:var(--ink);border-radius:var(--radius);min-height:0;box-shadow:var(--shadow);grid-template-rows:52px minmax(0,1fr);display:grid;overflow:hidden}.stage-head{border-bottom:1px solid var(--line);align-items:center;gap:10px;min-width:0;padding:0 14px;display:flex}.stage-head h2{white-space:nowrap;text-overflow:ellipsis;margin:0;font-size:16px;overflow:hidden}.stage-head .spacer{flex:1}.seg{background:var(--surface-2);border-radius:10px;gap:2px;padding:3px;display:inline-flex}.seg button{color:var(--ink-2);background:0 0;border:0;border-radius:8px;min-height:34px;padding:6px 12px;font-size:13.5px;font-weight:600}.seg button.on{color:var(--blue);box-shadow:var(--shadow-sm);background:#fff}.stage-body{grid-template-columns:76px minmax(0,1fr);min-height:0;display:grid}.stage-body.no-tools{grid-template-columns:minmax(0,1fr)}.tools{border-right:1px solid var(--line);background:#fff;flex-direction:column;align-items:center;gap:4px;padding:10px 6px;display:flex;overflow-y:auto}.tool{width:62px;min-height:54px;color:var(--ink-2);background:0 0;border:0;border-radius:10px;place-items:center;gap:2px;padding:6px 2px;font-size:11.5px;display:grid}.tool svg{width:22px;height:22px}.tool:hover{background:var(--surface-2)}.tool.on{background:var(--blue-50);color:var(--blue)}.tool:disabled{opacity:.4;cursor:not-allowed}.swatches{grid-template-columns:1fr 1fr;gap:6px;padding:6px 0;display:grid}.swatch{width:24px;height:24px;box-shadow:0 0 0 1px var(--line);border:2px solid #fff;border-radius:50%}.swatch.on{box-shadow:0 0 0 2px var(--blue)}.sizes{gap:4px;display:grid}.size-btn{background:0 0;border:0;border-radius:8px;place-items:center;width:52px;height:28px;display:grid}.size-btn.on{background:var(--blue-50)}.size-btn i{background:var(--ink);border-radius:99px;width:28px;display:block}.board-wrap{background:var(--surface-3);place-items:center;min-width:0;min-height:0;display:grid;position:relative;overflow:hidden}.board-canvas{box-shadow:var(--shadow-sm);touch-action:none;background:#fff;border-radius:6px;display:block}.board-canvas.cursor-pen{cursor:crosshair}.board-canvas.cursor-erase{cursor:cell}.board-canvas.cursor-select{cursor:default}.board-canvas.cursor-text{cursor:text}.board-canvas.readonly{cursor:default}.text-entry{border:2px solid var(--blue);background:#fff;border-radius:6px;outline:none;min-width:160px;padding:4px 6px;position:absolute}.board-pages{box-shadow:var(--shadow-sm);background:#fff;border-radius:99px;align-items:center;gap:6px;padding:4px;font-size:13px;display:flex;position:absolute;bottom:10px;left:50%;transform:translate(-50%)}.board-pages button{background:0 0;border:0;border-radius:99px;min-width:34px;height:34px}.board-pages button:hover{background:var(--surface-2)}.readonly-note{color:#fff;background:#14213dd9;border-radius:99px;padding:6px 12px;font-size:13px;position:absolute;top:10px;left:50%;transform:translate(-50%)}.screen-view{background:#000;place-items:center;min-height:0;display:grid}.screen-view video{max-width:100%;max-height:100%;display:block}.side{background:var(--surface);color:var(--ink);border-radius:var(--radius);min-height:0;box-shadow:var(--shadow);grid-template-rows:auto minmax(0,1fr) auto;display:grid;overflow:hidden}.tabs{border-bottom:1px solid var(--line);gap:4px;padding:8px 10px 0;display:flex}.tabs button{color:var(--ink-3);min-height:var(--tap);background:0 0;border:0;border-bottom:3px solid #0000;padding:10px 12px;font-weight:600}.tabs button.on{color:var(--blue);border-bottom-color:var(--blue)}.tabs .badge{background:var(--red);color:#fff;border-radius:99px;min-width:20px;margin-left:4px;padding:0 6px;font-size:12px;display:inline-block}.side-scroll{min-height:0;padding:10px;overflow-y:auto}.person{border-radius:10px;align-items:center;gap:10px;padding:8px;display:flex}.person:hover{background:var(--surface-2)}.person .av{color:#fff;border-radius:50%;flex:none;place-items:center;width:38px;height:38px;font-weight:700;display:grid;position:relative}.person .av .online{background:var(--ink-3);border:2px solid #fff;border-radius:50%;width:11px;height:11px;position:absolute;bottom:-1px;right:-1px}.person .av .online.yes{background:var(--green)}.person .who{flex:1;min-width:0}.person .who b{white-space:nowrap;text-overflow:ellipsis;font-size:14.5px;display:block;overflow:hidden}.person .who small{color:var(--ink-3)}.icon-btn{width:36px;height:36px;color:var(--ink-2);background:0 0;border:0;border-radius:9px;place-items:center;display:grid}.icon-btn:hover{background:var(--surface-3)}.icon-btn.on{color:var(--blue)}.icon-btn.bad{color:var(--red)}.icon-btn svg{width:19px;height:19px}.lobby-box{border:1px dashed var(--amber);background:#fff8ea;border-radius:12px;margin-bottom:10px;padding:10px}.lobby-box h4{margin:0 0 6px;font-size:14px}.switch-row{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:10px;padding:10px 8px;font-size:14px;display:flex}.switch{flex:none;width:44px;height:26px;position:relative}.switch input{opacity:0;cursor:pointer;width:100%;height:100%;margin:0;position:absolute}.switch span{background:var(--line);pointer-events:none;border-radius:99px;transition:background .15s;position:absolute;top:0;bottom:0;left:0;right:0}.switch span:after{content:"";width:20px;height:20px;box-shadow:var(--shadow-sm);background:#fff;border-radius:50%;transition:transform .15s;position:absolute;top:3px;left:3px}.switch input:checked+span{background:var(--blue)}.switch input:checked+span:after{transform:translate(18px)}.chat{grid-template-rows:minmax(0,1fr) auto;height:100%;min-height:0;display:grid}.msgs{align-content:start;gap:10px;padding:10px;display:grid;overflow-y:auto}.msg .meta{color:var(--ink-3);align-items:baseline;gap:6px;font-size:12.5px;display:flex}.msg .meta b{color:var(--ink)}.msg .bubble{background:var(--surface-2);word-wrap:break-word;white-space:pre-wrap;border-radius:4px 12px 12px;max-width:100%;margin-top:3px;padding:7px 11px;display:inline-block}.msg.mine .bubble{background:var(--blue-50)}.msg.deleted .bubble{color:var(--ink-3);font-style:italic}.composer{border-top:1px solid var(--line);gap:8px;padding:10px;display:flex}.composer .input{flex:1;min-width:0}.controls{scrollbar-width:thin;border-top:1px solid var(--navy-line);background:#08122780;align-items:center;gap:4px;min-width:0;padding:0 14px;display:flex;overflow:auto hidden}.ctl{min-width:76px;min-height:56px;color:var(--on-navy);background:0 0;border:0;border-radius:12px;place-items:center;gap:2px;padding:4px 8px;font-size:12px;display:grid;position:relative}.ctl svg{width:22px;height:22px}.ctl:hover{background:#ffffff12}.ctl.on{color:#7fd1ff}.ctl.off{color:#ff8a8c}.ctl:disabled{opacity:.45;cursor:not-allowed}.ctl .badge{background:var(--red);color:#fff;border-radius:99px;min-width:18px;padding:0 4px;font-size:11px;position:absolute;top:4px;right:14px}.controls .spacer{flex:1}.only-mobile{display:none}.reactions-float{pointer-events:none;z-index:50;position:fixed;bottom:96px;left:50%}.reaction{font-size:34px;animation:2.4s ease-out forwards floatUp;position:absolute}@keyframes floatUp{0%{opacity:0;transform:translateY(0)scale(.8)}15%{opacity:1;transform:translateY(-20px)scale(1.1)}to{opacity:0;transform:translateY(-220px)scale(1)}}@media (prefers-reduced-motion:reduce){.reaction{animation-duration:10ms}}.popover{color:var(--ink);box-shadow:var(--shadow);z-index:40;background:#fff;border-radius:14px;gap:4px;padding:8px;display:flex;position:absolute;bottom:64px}.popover button{background:0 0;border:0;border-radius:10px;width:44px;height:44px;font-size:24px}.popover button:hover{background:var(--surface-2)}.toasts{z-index:60;gap:8px;width:min(92vw,420px);display:grid;position:fixed;top:70px;left:50%;transform:translate(-50%)}.toast{background:var(--ink);color:#fff;box-shadow:var(--shadow);border-radius:12px;padding:10px 14px;font-size:14px}.toast.bad{background:var(--red)}.modal-back{z-index:70;background:#0812278c;place-items:center;padding:16px;display:grid;position:fixed;top:0;bottom:0;left:0;right:0}.modal{color:var(--ink);box-shadow:var(--shadow);background:#fff;border-radius:18px;width:min(100%,640px);max-height:90vh;padding:22px;overflow:auto}.modal h2{margin:0 0 12px}.modal .actions{flex-wrap:wrap;justify-content:flex-end;gap:8px;margin-top:16px;display:flex}.prejoin{gap:14px;display:grid}.preview{aspect-ratio:16/10;background:var(--navy-700);color:var(--on-navy-2);border-radius:14px;place-items:center;display:grid;overflow:hidden}.preview video{object-fit:cover;width:100%;height:100%;transform:scaleX(-1)}.waiting{text-align:center}.waiting .spinner{border:5px solid var(--blue-50);border-top-color:var(--blue);border-radius:50%;width:46px;height:46px;margin:10px auto 16px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.activity{background:linear-gradient(#f2f7ff,#fff);min-height:0;padding:22px;overflow:auto}.activity h3{margin:0 0 4px;font-size:24px}.activity .prompt{margin:12px 0 18px;font-size:clamp(20px,2.6vw,30px);font-weight:700}.options{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;display:grid}.option{border:3px solid var(--line);text-align:left;background:#fff;border-radius:16px;justify-content:space-between;align-items:center;gap:10px;min-height:72px;padding:10px 14px;font-size:20px;font-weight:700;display:flex}.option:hover:not(:disabled){border-color:var(--blue)}.option.chosen{border-color:var(--blue);background:var(--blue-50)}.option.right{border-color:var(--green);background:#e8f9f0}.option.wrong{border-color:var(--red);background:var(--red-50)}.option .count{color:var(--ink-3);font-size:14px;font-weight:600}.teacher-bar{flex-wrap:wrap;align-items:center;gap:8px;margin-top:18px;display:flex}.match-grid{grid-template-columns:1fr 1fr;gap:16px 28px;margin-top:14px;display:grid}.match-col{align-content:start;gap:10px;display:grid}.match-slot{border:3px dashed var(--line);background:#fff;border-radius:14px;grid-template-columns:1fr 1fr;align-items:center;gap:8px;min-height:64px;padding:8px;display:grid}.match-slot.target{border-color:var(--blue);background:var(--blue-50)}.match-slot.right{border-style:solid;border-color:var(--green)}.match-slot.wrong{border-style:solid;border-color:var(--red)}.match-left{padding-left:6px;font-size:18px;font-weight:700}.card-chip{border:2px solid var(--blue);touch-action:none;-webkit-user-select:none;user-select:none;background:#fff;border-radius:12px;min-height:48px;padding:6px 12px;font-size:17px;font-weight:700}.card-chip.selected{background:var(--blue);color:#fff}.card-chip.used{opacity:.35}.card-chip.dragging{z-index:80;pointer-events:none;box-shadow:var(--shadow);position:fixed}.sums{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;display:grid}.sum{border:2px solid var(--line);background:#fff;border-radius:14px;align-items:center;gap:10px;padding:10px 14px;font-size:22px;font-weight:700;display:flex}.sum input{text-align:center;border:2px solid var(--line);border-radius:10px;width:80px;min-height:46px;font-size:22px;font-weight:700}.sum.right{border-color:var(--green);background:#e8f9f0}.sum.wrong{border-color:var(--red);background:var(--red-50)}.score-table{border-collapse:collapse;width:100%;margin-top:12px;font-size:15px}.score-table th,.score-table td{text-align:left;border-bottom:1px solid var(--line);padding:8px}.launcher-list{grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:10px;margin-bottom:16px;display:grid}.launcher-item{text-align:left;border:2px solid var(--line);background:#fff;border-radius:14px;gap:4px;padding:12px;display:grid}.launcher-item.on{border-color:var(--blue);background:var(--blue-50)}.launcher-item b{font-size:15px}.launcher-item small{color:var(--ink-3);font-size:12.5px}.q-edit{border:1px solid var(--line);border-radius:12px;gap:8px;margin-bottom:10px;padding:12px;display:grid}.q-edit .opt-row{align-items:center;gap:8px;display:flex}.q-edit .opt-row .input{flex:1}.chk{align-items:center;gap:8px;min-height:36px;margin-right:14px;display:inline-flex}.chk input{width:18px;height:18px}@media (max-width:1180px){.class-body{grid-template-columns:minmax(0,1fr) 300px}.tile{width:150px}}@media (max-width:900px){.shell{grid-template-rows:auto 1fr;grid-template-columns:1fr}.sidebar{display:none}.mobile-top{background:var(--navy-900);color:var(--on-navy);justify-content:space-between;align-items:center;padding:10px 16px;display:flex}.page{padding:20px 16px 48px}.mobile-menu{background:var(--navy-900);padding:6px 12px 12px;display:block}.class-body{grid-template-columns:minmax(0,1fr);gap:8px;padding:8px}.side{z-index:30;display:none;position:fixed;top:30vh;bottom:80px;left:8px;right:8px}.side.open,.only-mobile{display:grid}.tile{width:128px}.classroom{grid-template-rows:52px 1fr 68px}}@media (max-width:640px){.stage-body{grid-template-rows:minmax(0,1fr) auto;grid-template-columns:minmax(0,1fr)}.tools{border-right:0;border-top:1px solid var(--line);flex-direction:row;order:2;padding:4px;overflow:auto hidden}.tool{flex:none;width:54px;min-height:50px}.swatches{padding:0 6px;display:flex}.sizes{display:flex}.size-btn{width:40px}.ctl{flex:1;min-width:0;padding:4px 2px;font-size:11px}.ctl .label-long{display:none}.controls{gap:0;padding:0 4px}.hide-phone{display:none!important}.tile{width:104px}.stage-head{padding:0 8px}.match-grid{grid-template-columns:1fr}.activity{padding:14px}}.remote-card{border-top:1px solid var(--line);gap:8px;padding:12px;display:grid}.remote-card:empty{display:none}.remote-head{align-items:center;gap:8px;font-weight:700;display:flex}.granted{background:#e8f9f0;border-radius:10px;padding:8px 10px;font-size:14px}.desktop-view{position:relative}.desktop-view video{width:100%;height:100%}.input-layer{cursor:crosshair;touch-action:none;outline:none;position:absolute;top:0;bottom:0;left:0;right:0}.input-layer:focus-visible{box-shadow:inset 0 0 0 3px var(--green)}.control-banner{z-index:2;background:var(--green);color:#fff;box-shadow:var(--shadow);white-space:nowrap;border-radius:99px;align-items:center;gap:10px;padding:6px 8px 6px 14px;font-weight:700;display:flex;position:absolute;top:8px;left:50%;transform:translate(-50%)}.link-view{grid-template-rows:auto minmax(0,1fr) auto;min-height:0;display:grid}.link-bar{border-bottom:1px solid var(--line);align-items:center;gap:8px;padding:8px 12px;display:flex}.link-view iframe{background:#fff;border:0;width:100%;height:100%}.link-note{margin:0;padding:6px 12px;font-size:12.5px}.browser{grid-template-rows:auto auto minmax(0,1fr) auto;min-height:0;display:grid}.browser-bar{border-bottom:1px solid var(--line);align-items:center;gap:6px;padding:8px 10px;display:flex}.browser-bar .btn{flex:none}.browser-bar .icon-only{width:36px;padding:0}.browser-bar .btn.on{background:var(--blue-50)}.browser-address{flex:1;min-width:0;min-height:36px}.browser-msg{color:var(--ink-2);background:var(--surface-3);margin:0;padding:5px 12px;font-size:12.5px}.browser-msg.on{color:#0b6b3f;background:#e3f7ec;font-weight:600}.browser-msg.bad{color:var(--red);background:var(--red-50);font-weight:600}.browser iframe{background:#fff;border:0;width:100%;height:100%}.browser-start{max-width:680px;padding:28px 24px;overflow:auto}.browser-start h3{margin:0 0 8px}.browser-start h4{margin:20px 0 8px;font-size:14px}.browser-links{flex-wrap:wrap;gap:8px;display:flex}.browser-start .small-print{margin-top:24px;font-size:12.5px}.linkish{color:var(--blue);font:inherit;cursor:pointer;background:0 0;border:0;padding:0;text-decoration:underline}.update-notice{z-index:60;width:min(380px,100vw - 32px);color:var(--ink);box-shadow:var(--shadow);border-left:5px solid var(--blue);background:#fff;border-radius:14px;gap:6px;padding:14px 16px;display:grid;position:fixed;bottom:16px;right:16px}.current-colour{outline:2px solid var(--line);outline-offset:2px;border-radius:50%;width:22px;height:22px}.popover.palette{gap:10px;width:168px;padding:12px;display:grid;top:0;bottom:auto;left:calc(100% + 8px)}.popover.palette .swatches{grid-template-columns:repeat(4,1fr);padding:0;display:grid}.popover.palette .sizes{justify-content:space-between;display:flex}.popover.palette .swatch{width:28px;height:28px}@media (max-height:900px) and (min-width:641px){.tool{width:52px;min-height:44px;padding:4px 2px}.tool .tool-label{display:none}.stage-body{grid-template-columns:64px minmax(0,1fr)}.tools{gap:2px;padding:6px 4px}}@media (max-height:800px) and (min-width:641px){.tool{min-height:38px}.tool svg{width:20px;height:20px}}@media (max-height:560px){.classroom{grid-template-rows:44px 1fr 54px}.class-top{padding:0 10px}.class-top img{width:24px!important;height:24px!important}.tile{width:92px}.tile .avatar{font-size:18px}.stage{grid-template-rows:minmax(0,1fr)}.stage-head{display:none}.class-main{gap:6px}.class-body{padding:6px}.ctl{min-height:46px;font-size:11px}.board-pages{font-size:12px;bottom:4px}.board-pages button{min-width:28px;height:28px}.tool .tool-label{display:none}}@media (max-width:640px){.tile .avatar{padding-bottom:18px;font-size:22px}}.controls .btn.danger,.ctl{flex:none}@media (max-width:640px){.ctl{flex:1 0 auto}}@media (max-height:760px) and (min-width:641px){.tile{width:140px}.stage-body{grid-template-columns:96px minmax(0,1fr)}.tools{grid-template-columns:1fr 1fr;align-content:start;justify-items:center;gap:2px;display:grid}.tool{width:42px}}.classroom.focus .class-body{grid-template-columns:minmax(0,1fr)}.classroom.focus .class-main{grid-template-rows:minmax(0,1fr);position:relative}.classroom.focus .stage{margin-right:140px}.classroom.focus .video-strip{z-index:15;flex-direction:column;max-height:100%;padding:0;position:absolute;top:0;right:0;overflow:hidden auto}.classroom.focus .tile{width:128px;box-shadow:var(--shadow)}.classroom.focus .side{z-index:30;width:min(360px,100vw - 24px);display:none;position:fixed;top:70px;bottom:84px;right:12px}.classroom.focus .side.open,.classroom.focus .only-mobile{display:grid}.file-hit{cursor:pointer;background:0 0;border:0;border-radius:10px;position:absolute}.file-hit:hover{background:#1f6fff14}.file-hit:focus-visible{background:#1f6fff14}.activity-log{border:1px solid var(--line);border-radius:var(--radius);background:#fff;overflow:hidden}.log-row{border-bottom:1px solid var(--line);grid-template-columns:92px 76px minmax(0,1fr) auto;align-items:start;gap:12px;padding:10px 14px;display:grid}.log-row:last-child{border-bottom:0}.log-time{font-variant-numeric:tabular-nums;font-size:14px;display:grid}.log-time small,.log-text small{color:var(--ink-3);font-size:12px}.log-level{text-align:center;border-radius:99px;padding:3px 8px;font-size:12px;font-weight:700}.log-text{gap:2px;min-width:0;display:grid}.log-detail{background:var(--surface-2);white-space:pre-wrap;word-break:break-word;border-radius:8px;margin:6px 0 0;padding:8px;font-size:12px}@media (max-width:640px){.log-row{grid-template-columns:70px minmax(0,1fr)}.log-level{grid-column:1}.log-row .btn{grid-column:2;justify-self:start}}.nav svg{flex:none;width:20px;height:20px}.btn svg{flex:none;width:18px;height:18px}.btn.small svg{width:16px;height:16px}.pill.lesson-clock svg{width:15px;height:15px}.pill.lesson-clock{font-variant-numeric:tabular-nums}.pill.lesson-clock.soon{border-color:var(--amber);color:var(--amber);font-weight:600}.toast.end-notice{background:var(--amber);color:#241500;gap:6px;padding:14px 16px;font-size:15px;display:grid}.toast.end-notice .btn{justify-self:start}.usage-line{border-radius:var(--radius-sm);background:var(--blue-50);color:var(--ink);align-items:flex-start;gap:8px;max-width:760px;margin:12px 0 0;padding:10px 14px;font-size:14px;display:flex}.usage-line svg{flex:none;width:18px;height:18px;margin-top:1px}.length-pick{border-radius:var(--radius-sm);background:var(--surface-2);gap:8px;padding:12px;display:grid}.admin-week{gap:8px;display:grid}.admin-day{justify-content:space-between;align-items:center;gap:12px;margin:0;display:flex}.admin-mode{border:0;gap:8px;margin:0;padding:0;display:grid}.admin-mode label{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.code-made{border:2px solid var(--blue)}.code-big{letter-spacing:.06em;color:var(--ink);-webkit-user-select:all;user-select:all;margin:0;font:700 26px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace}.code-list{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-sm);margin-top:16px;display:grid;overflow:hidden}.code-row{border-top:1px solid var(--line);color:var(--ink);grid-template-columns:150px minmax(0,1fr) minmax(0,1fr) auto;align-items:center;gap:12px;padding:10px 14px;font-size:14px;display:grid}.code-row:first-child{border-top:0}.code-mono{-webkit-user-select:all;user-select:all;font:600 14px ui-monospace,SFMono-Regular,Menlo,monospace}.code-status{color:var(--ink-2)}.code-status.unused{color:#0b6b3f;font-weight:600}.code-status.revoked,.code-status.expired{color:var(--ink-3)}.code-actions{justify-content:flex-end;gap:6px;display:flex}@media (max-width:760px){.code-row{grid-template-columns:1fr;gap:4px}.code-actions{justify-content:flex-start}}.teacher-plan,.teacher-limit{border-top:1px solid var(--line);gap:8px;padding-top:10px;display:grid}.teacher-plan h4,.teacher-limit h4{text-transform:uppercase;letter-spacing:.04em;color:var(--ink-3);margin:0;font-size:13px}.plan-status{margin:0;font-weight:600}.plan-status.ok{color:#0b6b3f}.plan-status.bad{color:var(--red)}.pay-form{border-radius:var(--radius-sm);background:var(--surface-2);gap:4px;padding:10px;display:grid}.pay-form .field{margin-bottom:6px}.pay-list{gap:2px;margin:0;padding-left:18px;font-size:13px;display:grid}.usage-line.plan-soon{background:#fff4dc}.usage-line.plan-ended{background:var(--red-50);color:#8a1c1e}.shelf{grid-template-columns:220px minmax(0,1fr);align-items:start;gap:20px;margin-top:20px;display:grid}.shelf-side{gap:2px;display:grid;position:sticky;top:16px}.shelf-side button{text-align:left;border-radius:var(--radius-sm);color:var(--ink);font:inherit;cursor:pointer;background:0 0;border:0;justify-content:space-between;gap:8px;padding:8px 10px;font-size:14px;display:flex}.shelf-side button span:first-child{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.shelf-side button:hover{background:var(--surface-3)}.shelf-side button.on{background:var(--blue-50);color:var(--blue-600);font-weight:600}.shelf-side h3{text-transform:uppercase;letter-spacing:.05em;color:var(--ink-3);margin:14px 10px 4px;font-size:12px}.shelf-side .shelf-new{color:var(--blue);justify-content:flex-start;align-items:center}.shelf-side .shelf-new svg{width:16px;height:16px}.shelf-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.shelf-head h2{margin:0}.shelf-filters{flex-wrap:wrap;gap:8px;margin:12px 0;display:flex}.shelf-filters .input{width:auto;min-height:40px}.shelf-filters input[type=search]{flex:260px}.shelf-filters select{flex:0 auto;max-width:200px}.shelf-active{align-items:center;gap:10px;margin:0 0 10px;font-size:13.5px;display:flex}.shelf-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;display:grid}.shelf-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);align-content:start;display:grid;position:relative;overflow:hidden}.shelf-card-main{text-align:left;font:inherit;color:var(--ink);cursor:pointer;background:0 0;border:0;gap:4px;padding:0 0 10px;display:grid}.shelf-card-main:focus-visible{outline:3px solid var(--blue);outline-offset:-3px}.shelf-card-main>:not(.shelf-thumb){padding:0 12px}.shelf-thumb{aspect-ratio:16/10;object-fit:cover;object-position:top;background:var(--surface-2);width:100%;margin-bottom:6px;display:block}.shelf-thumb.icon{place-items:center;font-size:40px;display:grid}.shelf-thumb.t-website,.shelf-thumb.t-design{background:#eef3ff}.shelf-thumb.t-video,.shelf-thumb.t-audio{background:#f3eeff}.shelf-type{text-transform:uppercase;letter-spacing:.04em;color:var(--blue-600);font-size:11.5px;font-weight:700}.shelf-title{-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:15px;line-height:1.3;display:-webkit-box;overflow:hidden}.shelf-about{font-size:12.5px}.shelf-star{width:34px;height:34px;box-shadow:var(--shadow-sm);color:var(--ink-3);cursor:pointer;background:#ffffffeb;border:0;border-radius:50%;font-size:18px;line-height:1;position:absolute;top:8px;right:8px}.shelf-star.on{color:var(--amber)}.shelf-tags{flex-wrap:wrap;gap:4px;padding:0 12px 12px;display:flex}.tag{font:inherit;background:var(--surface-3);color:var(--ink-2);cursor:pointer;border:0;border-radius:999px;padding:2px 8px;font-size:12px}.tag.on{background:var(--blue-50);color:var(--blue-600);font-weight:600}.tag.on button{color:inherit;font:inherit;cursor:pointer;background:0 0;border:0;padding:0 0 0 2px}.shelf-empty{border:2px dashed var(--line);border-radius:var(--radius);color:var(--ink-2);max-width:640px;padding:28px}.shelf-notice{border-radius:var(--radius-sm);color:#0b6b3f;background:#e3f7ec;max-width:760px;margin:12px 0 0;padding:10px 14px}.shelf-addlink{max-width:620px;margin-top:12px}.drawer-back{z-index:50;background:#08122773;justify-content:flex-end;display:flex;position:fixed;top:0;bottom:0;left:0;right:0}.drawer{background:var(--surface);color:var(--ink);width:min(100%,560px);height:100%;box-shadow:var(--shadow);padding:20px 22px 28px;overflow:auto}.drawer:focus{outline:none}.drawer-head{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.drawer-head h2{overflow-wrap:anywhere;margin:0 0 12px;font-size:20px}.shelf-preview{border-radius:var(--radius-sm);background:var(--surface-2);width:100%}.shelf-preview.pages{background:0 0;grid-auto-columns:minmax(140px,1fr);grid-auto-flow:column;gap:8px;display:grid;overflow-x:auto}.shelf-preview.pages img{border:1px solid var(--line);background:#fff;border-radius:8px;width:100%}.shelf-preview.frame{aspect-ratio:16/9;border:0}.shelf-preview.none{text-align:center;place-items:center;gap:6px;padding:28px;font-size:40px;display:grid}.shelf-preview.none .muted{font-size:13.5px}.shelf-inlesson{border-radius:var(--radius-sm);background:var(--blue-50);margin:10px 0 0;padding:10px 12px;font-size:13.5px}.shelf-form{gap:0;margin-top:16px;display:grid}.shelf-form-grid{grid-template-columns:1fr 1fr;gap:0 12px;display:grid}.shelf-collections{border:1px solid var(--line);border-radius:var(--radius-sm);gap:6px;margin:16px 0 0;padding:10px 14px 12px;display:grid}.shelf-collections legend{padding:0 4px;font-size:14px;font-weight:600}.shelf-collections label{align-items:center;gap:8px;display:flex}.danger-text{color:var(--red)}.shelf-picker{width:min(100%,760px)}@media (max-width:760px){.shelf{grid-template-columns:1fr}.shelf-side{flex-wrap:wrap;gap:6px;display:flex;position:static}.shelf-side h3{width:100%;margin:6px 0 0}.shelf-side button{border:1px solid var(--line)}.shelf-form-grid{grid-template-columns:1fr}.shelf-filters select{flex:140px;max-width:none}}