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form{margin:0}.railAccount button{min-height:44px;color:var(--muted);cursor:pointer;text-underline-offset:3px;background:0 0;border:0;padding:0;font-size:11px;text-decoration:underline}.dashboardMain{min-width:0;padding:clamp(34px,6vw,92px) clamp(26px,6vw,96px) 100px}.dashboardHeader{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:40px;max-width:1280px;margin:0 auto clamp(54px,7vw,96px);display:grid}.dashboardHeader h1{letter-spacing:-.052em;word-break:keep-all;max-width:18ch;margin:15px 0 0;font-size:clamp(1.9rem,3vw,3rem);font-weight:690;line-height:1.02}.teacherApplicationStatusBanner{border-top:2px solid var(--ink);border-bottom:1px solid var(--rule);grid-template-columns:150px minmax(0,1fr) auto;align-items:center;gap:clamp(18px,3vw,42px);max-width:1280px;margin:clamp(-56px,-4vw,-32px) auto 52px;padding:22px 0;display:grid}.teacherApplicationStatusCode{color:var(--accent);font:600 9px/1 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12px;font-size:11px;font-weight:620;display:grid}.roomClosedLabel:hover,.roomLifecycle:hover:not(:disabled){border-color:var(--accent)}.roomLifecycle:active:not(:disabled){transform:translateY(1px)}.roomEdit:disabled,.roomLifecycle:disabled{cursor:wait;opacity:.55}.roomLifecycle.roomReopen{border-color:var(--accent);background:var(--accent);color:var(--on-accent)}.roomLifecycle.roomArchive{color:var(--muted)}.roomRow-closed .roomOwnerActions .roomEnter{grid-column:1/-1}.roomClosedLabel{min-width:150px}.dashboardNotice{border-left:3px solid var(--accent);background:var(--accent-soft);max-width:1280px;color:var(--ink);margin:-58px auto 48px;padding:14px 16px;font-size:12px}.roomEmpty{border-top:2px solid var(--ink);border-bottom:1px solid var(--rule);grid-template-columns:160px minmax(0,1fr) auto;align-items:center;gap:30px;padding:42px 0;display:grid}.emptyBoard{aspect-ratio:16/10;background:var(--ink);border-radius:3px;width:160px;position:relative;overflow:hidden}.emptyBoard 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13px;font-size:clamp(1.8rem,3vw,2.8rem);line-height:1.02}.actionSheet header p:last-child{max-width:440px;color:var(--muted);margin:0;font-size:13px;line-height:1.6}.modePicker{border:0;gap:7px;margin:3px 0;padding:0;display:grid}.modePicker legend{margin-bottom:9px}.modePicker button{border:1px solid var(--rule);text-align:left;cursor:pointer;background:0 0;border-radius:4px;grid-template-columns:30px minmax(0,1fr) 18px;align-items:center;gap:8px;width:100%;min-width:0;min-height:67px;padding:10px 12px;display:grid}.modePicker button b{color:var(--muted);font:500 9px/1 var(--font-geist-mono),monospace}.modePicker button span{gap:4px;min-width:0;display:grid}.modePicker button strong{font-size:13px}.modePicker button small{color:var(--muted);overflow-wrap:anywhere;font-size:11px}.modePicker button i{border:1px solid var(--rule);width:14px;height:14px;box-shadow:inset 0 0 0 3px var(--paper);border-radius:50%}.modePicker button.active{border-color:var(--accent);background:var(--accent-soft)}.modePicker button.active i{border-color:var(--accent);background:var(--accent)}.coverUpload{border:1px dashed var(--rule);cursor:pointer;transition:border-color .2s var(--ease),background .2s var(--ease);border-radius:4px;grid-template-columns:150px minmax(0,1fr);align-items:center;gap:15px;padding:7px;display:grid;position:relative}.coverUpload:focus-within,.coverUpload:hover{border-color:var(--accent);background:var(--accent-soft)}.coverUploadPreview{aspect-ratio:16/9;background:var(--surface-muted);place-items:center;width:150px;display:grid;position:relative;overflow:hidden}.coverUploadPreview img{object-fit:cover}.coverUploadPreview i{color:var(--muted);font:normal 300 27px/1 var(--font-geist-sans),sans-serif}.coverUploadCopy{gap:5px;padding-right:8px;display:grid}.coverUploadCopy strong{font-size:12px}.coverUploadCopy small{color:var(--muted);font-size:10px;line-height:1.45}.coverUpload input{opacity:0;pointer-events:none;width:1px;height:1px;position:absolute;overflow:hidden}.editorField{gap:10px;display:grid}.editorField>div:first-child{gap:4px;display:grid}.editorField>div:first-child strong{font-size:12px}.editorField>div:first-child small{color:var(--muted);font-size:10px}.courseEditor{border:1px solid var(--rule);background:var(--paper);border-radius:4px;overflow:hidden}.courseEditor:focus-within{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.courseEditorToolbar{border-bottom:1px solid var(--rule);background:var(--surface-toolbar);flex-wrap:wrap;gap:3px;padding:7px;display:flex}.courseEditorToolbar button{min-height:44px;color:var(--muted);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:3px;padding:0 11px;font-size:11px}.courseEditorToolbar button:hover{color:var(--ink);background:var(--paper)}.courseEditorToolbar button.active{border-color:var(--accent);background:var(--accent-soft);color:var(--ink)}.courseEditorSurface{min-height:230px;color:var(--ink);outline:0;padding:18px;font-size:13px;line-height:1.7}.courseEditorSurface>:first-child{margin-top:0}.courseEditorSurface>:last-child{margin-bottom:0}.courseEditorSurface h2{letter-spacing:-.035em;margin:1.2em 0 .55em;font-size:1.45rem;line-height:1.2}.courseEditorSurface h3{margin:1.1em 0 .5em;font-size:1.1rem;line-height:1.3}.courseEditorSurface ol,.courseEditorSurface ul{padding-left:1.4rem}.courseEditorSurface blockquote{border-left:3px solid var(--accent);color:var(--muted);margin:1em 0;padding:3px 0 3px 14px}.courseEditorSurface a{color:var(--accent);text-underline-offset:3px;text-decoration:underline}.courseEditorSurface p.is-editor-empty:first-child:before{content:"수업 목표, 진행 방식, 준비물 등을 자세히 소개해 주세요.";float:left;height:0;color:var(--placeholder);pointer-events:none}.courseEditorLoading{border:1px solid var(--rule);background:linear-gradient(100deg,var(--surface-muted) 25%,var(--paper) 45%,var(--surface-muted) 65%);min-height:310px;animation:editorShimmer 1.4s var(--ease) infinite;background-size:200% 100%;border-radius:4px}@keyframes editorShimmer{to{background-position:-200% 0}}.formGrid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.formGrid,.formGrid input,.formGrid select,.formGrid textarea,.formGrid>*{min-width:0}.joinSummary{border-top:2px solid var(--ink);border-bottom:1px solid var(--rule);grid-template-columns:48px 1fr;align-items:center;gap:14px;padding:18px 0;display:grid}.joinSummary>span{color:var(--accent);font:550 11px/1 var(--font-geist-mono),monospace}.joinSummary div{gap:4px;display:grid}.joinSummary strong{font-size:13px}.joinSummary small{color:var(--muted);font-size:11px}.editRoomMode{border-top:2px solid var(--ink);border-bottom:1px solid var(--rule);grid-template-columns:48px minmax(0,1fr);align-items:center;gap:14px;padding:17px 0;display:grid}.editRoomMode>span{color:var(--accent);font:550 11px/1 var(--font-geist-mono),monospace}.editRoomMode div{gap:4px;display:grid}.editRoomMode strong{font-size:13px}.editRoomMode small{color:var(--muted);font-size:11px}.lifecycleBackdrop{z-index:160;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);animation:lifecycleFade .22s var(--ease) both;background:#1415139e;place-items:center;padding:18px;display:grid;position:fixed;inset:0}.lifecycleDialog{border:1px solid var(--rule);background:var(--paper);width:min(100%,520px);max-height:min(720px,92dvh);box-shadow:var(--shadow);animation:lifecycleDialogIn .32s var(--ease) both;border-radius:6px;padding:clamp(28px,5vw,48px);overflow-y:auto}@keyframes lifecycleFade{0%{opacity:0}}@keyframes lifecycleDialogIn{0%{opacity:0;transform:translateY(14px)scale(.985)}}.lifecycleDialog header{margin-bottom:26px}.lifecycleDialog header h2{letter-spacing:-.05em;margin:14px 0 10px;font-size:clamp(1.85rem,5vw,2.8rem);line-height:1.04}.lifecycleDialog header>p:last-child{max-width:48ch;color:var(--muted);word-break:keep-all;margin:0;font-size:13px;line-height:1.65}.lifecycleRoomIdentity{border-top:2px solid var(--ink);border-bottom:1px solid var(--rule);gap:6px;padding:16px 0;display:grid}.lifecycleRoomIdentity small{color:var(--muted);font:550 9px/1 var(--font-geist-mono),monospace;letter-spacing:.08em}.lifecycleRoomIdentity strong{overflow-wrap:anywhere;font-size:16px}.lifecycleRecordingWarning{border-left:3px solid var(--accent);background:var(--accent-soft);color:var(--error-text);word-break:keep-all;margin:16px 0 0;padding:11px 13px;font-size:12px;line-height:1.55}.lifecycleConfirmationField{margin-top:22px}.lifecycleConfirmationField small{color:var(--muted);font-size:10px;line-height:1.5}.lifecycleError{border-left:3px solid var(--accent);background:var(--accent-soft);color:var(--error-text);margin:18px 0 0;padding:12px 14px;font-size:12px;line-height:1.55}.lifecycleDialogActions{grid-template-columns:1fr 1.35fr;gap:8px;margin-top:26px;display:grid}.lifecycleDialogActions button{cursor:pointer;min-height:48px;transition:transform .2s var(--ease),opacity .2s var(--ease),border-color .2s var(--ease);border-radius:3px;font-size:12px;font-weight:650}.lifecycleDialogActions button:active:not(:disabled){transform:translateY(1px)scale(.995)}.lifecycleCancel{border:1px solid var(--rule);color:var(--muted);background:0 0}.lifecycleCancel:hover:not(:disabled){border-color:var(--ink);color:var(--ink)}.lifecycleConfirm{border:1px solid var(--accent);background:var(--accent);color:var(--on-accent)}.lifecycleDialogActions button:disabled{cursor:wait;opacity:.5}.adminPage{background:var(--canvas);min-height:100dvh}.adminTopbar{border-bottom:1px solid var(--rule);background:var(--paper);grid-template-columns:minmax(180px,1fr) auto minmax(180px,1fr);align-items:center;min-height:70px;padding:0 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0}.teacherApplicationStatusCode{grid-column:1/-1}.teacherApplicationStatusBanner p{font-size:11px}.teacherApplicationStatusBadge{grid-area:2/2;align-self:start}.createButton{justify-content:space-between;width:100%}.roomSection{margin-bottom:70px}.closedRoomSection{margin-top:-22px}.closedRoomGuide{margin:-8px 0 18px 28px}.sectionHeading{grid-template-columns:28px 1fr auto}.roomRow{grid-template-columns:28px minmax(0,1fr);gap:12px;padding:24px 0}.roomThumb{aspect-ratio:16/9;width:min(100%,300px)}.roomIdentity,.roomThumb{grid-column:2}.roomIdentity h3,.roomIdentity p{white-space:normal}.roomIdentity p{line-height:1.5}.roomMeta{border-top:1px solid var(--rule);grid-column:2;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:6px;width:100%;padding:10px 0 2px}.roomMeta>span{grid-column:auto;margin:0;font-size:10px}.roomMeta strong{font-size:18px}.roomMeta em{font-size:10px}.roomRow>.roomActions,.roomRow>.roomClosedLabel,.roomRow>.roomEnter{grid-column:2;justify-self:stretch}.roomClosedLabel,.roomEnter{grid-column:2;width:100%;min-width:0}.roomActions{grid-column:2;grid-template-columns:1fr 1.35fr;width:100%}.roomOwnerActions{grid-template-columns:repeat(2,minmax(0,1fr))}.roomActions .roomEnter{grid-column:auto;min-width:0}.roomEdit{width:100%}.roomEmpty{grid-template-columns:1fr}.emptyBoard{width:min(100%,300px)}.roomEmpty button{grid-column:1}.discoverSection{margin-bottom:90px}.modeManifest{gap:16px;padding-top:32px}.modeManifestIntro{display:block}.modeManifestIntro p{margin-top:6px}.modeManifestRow{grid-template-columns:34px minmax(0,1fr);align-items:start;gap:12px;min-height:0;padding:18px 0}.modeManifestIndex{padding-top:4px}.modeManifestCopy{grid-template-columns:1fr;gap:3px}.modeManifestCopy p{margin-top:3px}.actionSheet{width:100%;padding:52px 20px 40px}.actionSheet header h2{font-size:clamp(1.75rem,8vw,2.15rem)}.formGrid{grid-template-columns:1fr}.coverUpload{grid-template-columns:120px minmax(0,1fr)}.coverUploadPreview{width:120px}.classroomPage{height:auto;min-height:100dvh}.classroomBody,.classroomPage{display:block;overflow:visible}.classroomTopbar{grid-template-columns:auto minmax(0,1fr);gap:8px;min-height:64px;padding:8px 10px}.classroomTitle span{display:none}.classroomTitle strong{font-size:12px}.classroomActions{grid-column:1/-1;grid-template-columns:none;grid-auto-columns:minmax(0,1fr);grid-auto-flow:column;gap:4px;width:100%;display:grid}.classroomActions a,.classroomEndButton,.classroomIntroButton{min-width:0;padding:0 6px;font-size:10px}.classroomActions .themeToggleInline{grid-template-columns:18px;place-content:center;width:44px;padding:0}.classroomActions .themeToggleInline strong{display:none}.classroomExperienceLayout{grid-template:"media""mobile-tabs""mobile-content"minmax(0,auto)/minmax(0,1fr);gap:6px;height:auto;max-height:none;padding:6px;overflow:visible}.classroomExperienceLayout.hasLayoutControls{grid-template-rows:auto auto auto minmax(0,auto);grid-template-areas:"media""layout-controls""mobile-tabs""mobile-content"}.classroomLayoutControls{width:100%}.classroomLayoutControls button{min-height:44px;font-size:10px}.classroomMediaArea{scrollbar-gutter:auto;justify-self:center;width:min(100%,640px);overflow:visible}.classroomMobileTabs{border:1px solid var(--rule);background:var(--paper);border-radius:5px;grid-area:mobile-tabs;grid-template-columns:repeat(2,minmax(0,1fr));min-height:52px;padding:4px;display:grid}.classroomMobileTabs button{min-width:0;min-height:44px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:3px;font-size:12px;position:relative}.classroomMobileTabs button.active{background:var(--accent-soft);color:var(--ink);font-weight:700}.classroomMobileTabs button.active:after{content:"";background:var(--accent);height:2px;position:absolute;bottom:3px;left:12px;right:12px}.classroomCommunicationArea,.classroomWorkspaceArea{grid-area:mobile-content;min-width:0}.classroomCommunicationArea[data-mobile-active=false],.classroomWorkspaceArea[data-mobile-active=false]{display:none}.classroomCommunicationArea{min-height:clamp(360px,58dvh,620px)}.oneToOneMediaStage.viewerStudent .oneToOneLocalPreview{display:none}.oneToOneLocalPreview{width:min(46%,180px)}.smallGroupMediaStage .teacherCaption{display:none}.smallGroupStudentGrid{grid-template-columns:repeat(2,minmax(0,1fr))}.smallGroupStudentTile{aspect-ratio:auto;height:72px}.smallGroupMediaStage.viewerStudent .smallGroupStudentTile.isLocal{display:none}.classroomClosedBanner{grid-template-columns:1fr;gap:12px;padding-block:16px}.classroomClosedBanner>div:first-child{grid-template-columns:1fr;gap:5px}.classroomClosedBanner small,.classroomClosedBanner strong,.classroomClosedBanner>div:first-child span{grid-column:1}.classroomReopenControl{justify-items:stretch}.classroomReopenControl>div{grid-template-columns:1fr 1fr;display:grid}.classroomReopenControl>span{text-align:left;max-width:none}.mediaJoinCard,.mediaTile,.mediaTiles{min-height:0}.groupTeacherTile,.mediaStageEnded,.mediaTiles,.oneToOneRemoteTiles{aspect-ratio:16/9;width:100%;height:auto;min-height:0}.sideChat{grid-column:auto}.workspaceStage{min-height:clamp(540px,72dvh,680px)}.workspaceTabs{grid-template-columns:1fr;gap:7px;padding:8px;display:grid;overflow:visible}.workspaceTabs>div:first-child{grid-template-columns:repeat(3,minmax(0,1fr));width:100%;height:auto;display:grid}.workspaceTabs>div:first-child button{min-width:0;min-height:44px;padding:0 4px}.workspaceCommands{grid-template-columns:repeat(3,minmax(0,1fr));width:100%;height:auto;margin:0;display:grid}.workspaceCommands button{white-space:normal;min-width:0;min-height:46px;padding:0 6px;font-size:12px}.workspaceCommands .automaticRecordingBadge{min-width:0;min-height:46px;padding:0 6px;font-size:11px}.whiteboardWorkspace{grid-template-rows:minmax(420px,1fr) auto}.whiteboardCanvasArea{min-height:420px}.whiteboardToolbar{align-items:flex-start;padding:8px}.boardBackgrounds{width:100%}.boardBackgrounds button{flex:1;justify-content:center}.boardToolbarRule{display:none}.boardPalette{flex-wrap:wrap}.boardHistory{width:100%;margin-left:0}.boardHistory button{flex:1}.surface-overlay .whiteboardToolbar{scrollbar-width:thin;flex-wrap:nowrap;align-items:center;height:auto;overflow:auto hidden}.surface-overlay .boardHistory,.surface-overlay .boardPalette,.surface-overlay .boardTools,.surface-overlay .boardWidth{flex:none;width:auto}.surface-overlay .boardHistory button,.surface-overlay .boardTools button{white-space:nowrap;flex:none}.surface-overlay .boardPalette{flex-wrap:nowrap}.boardContent{width:82%}.boardContent h1{font-size:clamp(2.3rem,12vw,4rem)}.boardChecklist{grid-template-columns:1fr}.boardToolbar p{display:none}.workspaceTabs{align-items:stretch}.workspaceCommands span{display:none}.broadcastWorkspace{grid-template-rows:minmax(420px,58dvh) auto;grid-template-columns:1fr;overflow-y:auto}.broadcastPlayer{border-bottom:1px solid #fbfbf821;border-right:0;min-height:420px}.broadcastManifest h2{font-size:clamp(2.5rem,13vw,4rem)}.recordingList article{grid-template-columns:32px minmax(0,1fr)}.recordingList video,.recordingStatus,.serverReplayActions,.youtubeReplayActions{grid-column:2;justify-self:stretch}.youtubeReplayActions{justify-content:flex-start}.youtubeReplayForm{grid-template-columns:1fr;align-items:stretch}.adminTopbar{grid-template-columns:1fr auto}.adminTopbar>.adminIdentity{display:none}.adminActions .themeToggleInline{grid-template-columns:18px;place-content:center;width:44px;padding:0}.adminActions .themeToggleInline strong{display:none}.adminHero{grid-template-columns:1fr;margin-bottom:78px}.adminHero h1{font-size:clamp(2.9rem,14vw,5rem)}.adminHero .createButton{width:100%}.adminRoomCard{grid-template-columns:minmax(0,1fr);gap:18px;padding:24px 0}.adminRoomActions,.adminRoomIdentity,.adminRoomOperations,.adminRoomRuntime{grid-area:auto/1}.adminRoomFacts{grid-template-columns:minmax(0,1fr);gap:9px}.adminRoomFacts>div{grid-template-columns:42px minmax(0,1fr)}.adminRoomRuntime{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:12px}.adminRoomOccupancy{justify-self:end}.adminRoomActions{grid-template-columns:repeat(2,minmax(0,1fr));width:100%;display:grid}.adminRoomActions .roomEdit,.adminRoomActions .roomLifecycle{width:100%;min-width:0}.adminRoomActions>:last-child:nth-child(odd){grid-column:1/-1}.adminRoomArchivedLabel{border:1px solid var(--rule);grid-column:1/-1;place-items:center;min-height:44px;display:grid}.teacherTableHead{display:none}.teacherTable article{grid-template-columns:1fr auto;gap:8px;padding:18px 0}.teacherTable article>span:not(.teacherStatus){grid-column:1/-1;padding-left:50px}.teacherTable article time{display:none}.teacherApplicationTable article{grid-template-columns:minmax(0,1fr) auto}.teacherApplicationTable article>div:first-child{grid-column:1/-1}.teacherApplicationTable .teacherStatus{grid-column:1}.teacherApplicationActions{grid-column:2}.teacherApplicationActions>button{width:auto;min-width:70px}.adminQueueFeedback{margin-left:28px}.teacherApplicationIdentity{grid-template-columns:1fr}.teacherApplicationIdentity small{grid-column:1}.teacherApplicationIdentity span{text-align:left}.courseIntroBackdrop{padding:6px}.courseIntroDialog{width:100%;max-height:92dvh}.courseIntroDialog>header{min-height:76px;padding:14px 16px}.courseIntroDialog header h2{font-size:1.2rem}.courseIntroModalContent{padding:24px 18px 34px;font-size:14px}.lifecycleBackdrop{align-items:end;padding:6px}.lifecycleDialog{width:100%;max-height:94dvh;padding:30px 20px max(24px,env(safe-area-inset-bottom));border-radius:6px 6px 0 0}.lifecycleDialogActions{grid-template-columns:1fr 1.25fr}.localRecordingBackdrop{align-items:end;padding:6px}.localRecordingDialog{width:100%;max-height:94dvh;padding:30px 20px max(24px,env(safe-area-inset-bottom));border-radius:6px 6px 0 0}.localRecordingSteps article{grid-template-columns:28px minmax(0,1fr)}.localRecordingSteps article>button{grid-column:2;width:100%}.studentRecordingNotice{padding-inline:6px}.themeToggle{right:10px;bottom:max(10px,env(safe-area-inset-bottom));grid-template-columns:18px auto;padding:0 11px}.themeToggle>span{display:none}}@media (orientation:landscape) and (max-width:932px) and (max-height:520px){.classroomTopbar{grid-template-columns:auto minmax(0,1fr) auto;min-height:64px}.classroomActions{grid-column:auto;grid-auto-columns:auto;width:auto}.classroomExperienceLayout[data-viewer-role=student] .classroomMediaArea{width:min(100%,420px)}.classroomExperienceLayout[data-viewer-role=student] .teacherCaption{display:none}.classroomExperienceLayout[data-classroom-mode=small_group] .classroomMediaArea{width:min(100%,420px)}.smallGroupTeacherTile{justify-self:center;width:min(100%,260px)}.smallGroupStudentTile{height:44px}.smallGroupStudentTile .mediaTile footer{min-height:22px}.smallGroupStudentTile .mediaCameraOffState{inset:0 0 22px}}@media (prefers-reduced-motion:reduce){*,:after,:before{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}