:root {
  --bg: #f4f4f6;
  --paper: #ffffff;
  --ink: #111114;
  --muted: #777780;
  --glass: rgba(255,255,255,.76);
  --border: rgba(20,20,30,.10);
  --shadow: 0 14px 40px rgba(20,20,30,.12);
}
*{box-sizing:border-box}
html,body,#app{width:100%;height:100%;margin:0;overflow:hidden}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--bg);color:var(--ink);touch-action:none}
button,input{font:inherit}
button{border:0;background:none;color:inherit}
.glass{background:var(--glass);border:1px solid rgba(255,255,255,.7);box-shadow:var(--shadow);backdrop-filter:blur(24px) saturate(140%);-webkit-backdrop-filter:blur(24px) saturate(140%)}
.topbar{position:fixed;z-index:50;top:max(14px,env(safe-area-inset-top));left:18px;right:18px;height:54px;border-radius:18px;display:flex;align-items:center;justify-content:space-between;padding:0 10px 0 16px}
.brand-wrap,.top-actions{display:flex;align-items:center;gap:10px}.brand{font-weight:700;font-size:18px;letter-spacing:-.04em}
.room-pill,.status-pill{height:30px;padding:0 10px;border-radius:999px;background:rgba(245,245,247,.86);border:1px solid var(--border);display:inline-flex;align-items:center;gap:7px;font-size:12px;color:#4b4b54}.room-pill{cursor:pointer}.room-pill:hover{background:#fff}.copy-icon{font-size:13px}
.status-dot{width:7px;height:7px;border-radius:50%;background:#a0a0a8}.status-pill.live .status-dot{background:#22c55e;box-shadow:0 0 0 3px rgba(34,197,94,.12)}
.icon-btn{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;cursor:pointer;font-size:18px}.icon-btn:hover{background:rgba(0,0,0,.05)}.danger:hover{background:rgba(255,50,50,.08);color:#d11}
#viewport{position:absolute;inset:0;overflow:hidden;background:var(--bg)}
#board{position:absolute;inset:0;background-color:var(--paper);background-image:radial-gradient(circle at 1px 1px,rgba(0,0,0,.07) 1px,transparent 0);background-size:24px 24px;cursor:default;outline:none;user-select:none;-webkit-user-select:none}
#board[data-tool="text"]{cursor:text}#board[data-draw="1"]{cursor:crosshair}
.empty-hint{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);pointer-events:none;text-align:center;opacity:.34;transition:.25s}.empty-hint.hidden{opacity:0}.hint-title{font-size:40px;font-weight:600;letter-spacing:-.06em}.hint-sub{margin-top:10px;font-size:13px;color:var(--muted)}
.tool-dock{position:fixed;z-index:60;left:50%;bottom:max(18px,env(safe-area-inset-bottom));transform:translateX(-50%);height:58px;border-radius:20px;padding:7px;display:flex;align-items:center;gap:4px;max-width:calc(100vw - 20px)}
.tool{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;cursor:pointer;font-weight:600;font-size:17px}.tool:hover{background:rgba(0,0,0,.05)}.tool.active{background:#111;color:#fff}.divider{width:1px;height:28px;background:var(--border);margin:0 2px}.upload{position:relative}
.color-wrap{width:42px;height:42px;display:grid;place-items:center;cursor:pointer}.color-wrap input{position:absolute;opacity:0;pointer-events:none}.color-swatch{width:25px;height:25px;border-radius:50%;background:#111;border:4px solid #fff;box-shadow:0 0 0 1px rgba(0,0,0,.15)}
.size-wrap{width:80px;display:flex;align-items:center;padding:0 7px}.size-wrap input{width:100%;accent-color:#111}

.tool-dock [data-tooltip-key]{position:relative}
.tool-bubble{position:fixed;z-index:220;left:0;top:0;max-width:min(280px,calc(100vw - 16px));padding:8px 12px;border-radius:999px;background:rgba(17,17,20,.94);color:#fff;border:1px solid rgba(255,255,255,.14);box-shadow:0 10px 28px rgba(0,0,0,.22);backdrop-filter:blur(16px) saturate(150%);-webkit-backdrop-filter:blur(16px) saturate(150%);font-size:12px;font-weight:700;line-height:1;letter-spacing:.01em;white-space:nowrap;overflow:visible;pointer-events:none;opacity:0;visibility:hidden;transform:translateY(5px) scale(.97);transform-origin:50% 100%;transition:opacity .13s ease,transform .13s ease,visibility 0s linear .13s}
.tool-bubble>span{display:block;max-width:min(256px,calc(100vw - 40px));overflow:hidden;text-overflow:ellipsis}
.tool-bubble::after{content:"";position:absolute;left:var(--arrow-x,50%);bottom:-5px;width:10px;height:10px;background:rgba(17,17,20,.94);border-right:1px solid rgba(255,255,255,.10);border-bottom:1px solid rgba(255,255,255,.10);transform:translateX(-50%) rotate(45deg)}
.tool-bubble.below{transform-origin:50% 0}.tool-bubble.below::after{top:-5px;bottom:auto;border:0;border-left:1px solid rgba(255,255,255,.10);border-top:1px solid rgba(255,255,255,.10)}
.tool-bubble.show{opacity:1;visibility:visible;transform:translateY(0) scale(1);transition-delay:0s}
.tool-bubble[hidden]{display:none!important}
@media(hover:none),(pointer:coarse){.tool-bubble{display:none!important}}
.board-item{position:absolute;transform-origin:center center;touch-action:none}.board-item.selected{outline:2px solid #111;outline-offset:4px}.board-item.selected::after{content:"";position:absolute;width:12px;height:12px;right:-10px;bottom:-10px;border-radius:50%;background:#111;border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.25);cursor:nwse-resize}
.text-item{min-width:60px;min-height:34px;padding:4px 6px;font-size:28px;font-weight:500;line-height:1.15;white-space:pre-wrap;word-break:break-word;user-select:text;-webkit-user-select:text}.text-item[contenteditable="true"]{outline:2px solid #111;outline-offset:4px;cursor:text}
.image-item{max-width:none;display:block;pointer-events:none;border-radius:3px;box-shadow:0 2px 12px rgba(0,0,0,.08)}
.stroke-item{position:absolute;overflow:visible;pointer-events:none}.stroke-hit{pointer-events:stroke;cursor:pointer}
.toast{position:fixed;z-index:1000;left:50%;top:82px;transform:translate(-50%,-10px);background:#111;color:#fff;border-radius:999px;padding:9px 14px;font-size:12px;opacity:0;pointer-events:none;transition:.2s}.toast.show{opacity:1;transform:translate(-50%,0)}
.drag-over::before{content:attr(data-drop-label);position:absolute;inset:18px;border:2px dashed #111;border-radius:24px;display:grid;place-items:center;font-weight:600;font-size:24px;background:rgba(255,255,255,.72);z-index:45;pointer-events:none}
@media(max-width:720px){.topbar{left:10px;right:10px}.hint-title{font-size:30px}.hint-sub{max-width:250px;line-height:1.5}.tool-dock{overflow-x:auto;justify-content:flex-start;left:10px;right:10px;transform:none}.size-wrap{width:64px}.tool{flex:0 0 42px}.divider{flex:0 0 1px}}
.status-pill.connecting .status-dot{background:#f59e0b;animation:qboardPulse 1s infinite alternate}
.status-pill.error .status-dot{background:#ef4444}
@keyframes qboardPulse{from{opacity:.35}to{opacity:1}}

.text-block-item{background:#fff;border:1px solid rgba(20,20,30,.11);border-radius:16px;box-shadow:0 8px 26px rgba(20,20,30,.10);overflow:hidden;display:flex;flex-direction:column;min-width:220px;min-height:120px}
.text-block-item.selected{outline:2px solid #111;outline-offset:4px}
.text-block-item.selected::after{content:"";position:absolute;width:12px;height:12px;right:-10px;bottom:-10px;border-radius:50%;background:#111;border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.25);cursor:nwse-resize}
.text-block-toolbar{height:36px;display:flex;align-items:center;justify-content:flex-end;padding:5px 7px;border-bottom:1px solid rgba(20,20,30,.07);background:rgba(248,248,250,.92);flex:0 0 auto}
.copy-text-btn{height:25px;padding:0 9px;border-radius:8px;border:1px solid rgba(20,20,30,.10);background:#fff;display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:600;color:#45454d;cursor:pointer;touch-action:manipulation}
.copy-text-btn:hover{background:#111;color:#fff}
.text-block-content{padding:14px 16px 18px;overflow:auto;white-space:pre-wrap;word-break:break-word;line-height:1.55;font-size:15px;color:#17171b;user-select:text;-webkit-user-select:text;flex:1;touch-action:pan-y}
.modal-backdrop{position:fixed;z-index:120;inset:0;background:rgba(15,15,18,.28);display:grid;place-items:center;padding:20px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);touch-action:auto}
.modal-backdrop[hidden]{display:none}
.text-block-dialog{width:min(680px,calc(100vw - 28px));border-radius:24px;padding:18px;touch-action:auto}
.dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding:2px 2px 14px}
.dialog-head h2{margin:0;font-size:20px;letter-spacing:-.03em}.dialog-head p{margin:5px 0 0;color:var(--muted);font-size:12px;line-height:1.5}
.dialog-close{width:34px;height:34px;border-radius:11px;background:rgba(0,0,0,.05);cursor:pointer;font-size:22px;line-height:1}.dialog-close:hover{background:rgba(0,0,0,.09)}
#textBlockInput{display:block;width:100%;height:min(42vh,340px);min-height:190px;resize:vertical;border:1px solid rgba(20,20,30,.12);border-radius:16px;background:#fff;color:#111;padding:15px 16px;outline:none;font:15px/1.6 'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;box-shadow:inset 0 1px 2px rgba(0,0,0,.02);touch-action:auto;user-select:text;-webkit-user-select:text}
#textBlockInput:focus{border-color:#111;box-shadow:0 0 0 3px rgba(0,0,0,.06)}
.dialog-actions{display:flex;align-items:center;justify-content:space-between;gap:14px;padding-top:14px}.char-count{font-size:11px;color:var(--muted)}.dialog-buttons{display:flex;gap:8px}
.secondary-btn,.primary-btn{height:38px;padding:0 15px;border-radius:12px;cursor:pointer;font-size:13px;font-weight:600}.secondary-btn{background:rgba(0,0,0,.05)}.secondary-btn:hover{background:rgba(0,0,0,.09)}.primary-btn{background:#111;color:#fff}.primary-btn:hover{background:#29292d}.primary-btn:disabled{opacity:.35;cursor:not-allowed}
@media(max-width:720px){.text-block-dialog{padding:14px;border-radius:20px}.dialog-head p{max-width:250px}#textBlockInput{height:38vh;min-height:170px}.dialog-actions{align-items:flex-end}.dialog-buttons{flex:1;justify-content:flex-end}.secondary-btn,.primary-btn{padding:0 12px}}

.role-pill{height:26px;padding:0 9px;border-radius:999px;background:transparent;border:1px solid rgba(20,20,30,.10);font-size:10px;font-weight:650;color:#777780;cursor:pointer;transition:.18s;letter-spacing:.01em}
.role-pill:hover{background:#fff;color:#333}.role-pill.teacher{background:#111;color:#fff;border-color:#111;box-shadow:0 2px 8px rgba(0,0,0,.12)}
.teacher-dialog{width:min(460px,calc(100vw - 28px));border-radius:24px;padding:18px;touch-action:auto}
.teacher-field{display:flex;flex-direction:column;gap:7px;font-size:12px;font-weight:650;color:#4d4d55}
.teacher-field input{width:100%;height:46px;border:1px solid rgba(20,20,30,.12);border-radius:14px;background:#fff;color:#111;padding:0 14px;outline:none;font-size:15px;touch-action:auto;user-select:text;-webkit-user-select:text}
.teacher-field input:focus{border-color:#111;box-shadow:0 0 0 3px rgba(0,0,0,.06)}
.teacher-actions{margin-top:2px}.teacher-note{font-size:10px;line-height:1.4;color:var(--muted);max-width:190px}
.icon-btn[hidden]{display:none!important}
@media(max-width:720px){.role-pill{padding:0 9px}.teacher-actions{align-items:flex-end}.teacher-note{max-width:130px}}

/* v8 classroom entry + authorship */
body.locked #toolDock{opacity:.35;pointer-events:none}
button:disabled{opacity:.4;cursor:not-allowed}
.user-pill{height:28px;padding:0 10px;border-radius:999px;background:#111;color:#fff;display:inline-flex;align-items:center;font-size:11px;font-weight:650;white-space:nowrap;max-width:160px;overflow:hidden;text-overflow:ellipsis}
.logout-btn{height:32px;padding:0 11px;border-radius:10px;background:rgba(0,0,0,.055);font-size:11px;font-weight:650;cursor:pointer}.logout-btn:hover{background:#111;color:#fff}
.entry-gate{position:fixed;z-index:300;inset:0;background:rgba(240,240,243,.72);display:grid;place-items:center;padding:22px;backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);touch-action:auto}.entry-gate[hidden]{display:none}
.entry-card{width:min(560px,calc(100vw - 28px));border-radius:28px;padding:28px;touch-action:auto}.entry-brand{font-size:15px;font-weight:750;letter-spacing:-.04em;margin-bottom:22px}.entry-card h1{margin:0;font-size:30px;letter-spacing:-.055em}.entry-card>p{margin:8px 0 22px;color:var(--muted);font-size:13px}
.role-choice{display:grid;grid-template-columns:1fr 1fr;gap:12px}.role-card{min-height:150px;border:1px solid rgba(20,20,30,.10);border-radius:20px;background:rgba(255,255,255,.78);padding:18px;text-align:left;cursor:pointer;display:flex;flex-direction:column;justify-content:flex-end;transition:.18s}.role-card:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(20,20,30,.09);border-color:rgba(20,20,30,.2)}.role-icon{width:38px;height:38px;border-radius:12px;background:#111;color:#fff;display:grid;place-items:center;font-size:14px;font-weight:750;margin-bottom:auto}.role-card strong{font-size:16px}.role-card small{margin-top:5px;color:var(--muted);font-size:11px;line-height:1.4}
.entry-form{display:flex;flex-direction:column;gap:14px}.entry-form label{display:flex;flex-direction:column;gap:7px;font-size:12px;font-weight:650;color:#4d4d55}.entry-form input,.entry-form select{width:100%;height:48px;border:1px solid rgba(20,20,30,.12);border-radius:14px;background:#fff;color:#111;padding:0 14px;outline:none;font-size:15px;touch-action:auto;user-select:text;-webkit-user-select:text}.entry-form input:focus,.entry-form select:focus{border-color:#111;box-shadow:0 0 0 3px rgba(0,0,0,.06)}.form-note{margin:-2px 0 0!important;font-size:11px!important;line-height:1.55!important;color:var(--muted)!important}.entry-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:2px}
.author-label{position:absolute;z-index:4;pointer-events:none;height:18px;display:flex;align-items:center;padding:0 7px;border-radius:999px;background:rgba(255,255,255,.92);border:1px solid rgba(20,20,30,.08);box-shadow:0 2px 8px rgba(20,20,30,.06);font-size:9px;font-weight:650;color:#686870;white-space:nowrap;max-width:180px;overflow:hidden;text-overflow:ellipsis;transform:translateY(4px)}
.author-label::before{content:attr(data-prefix);font-weight:500;color:#9a9aa1;margin-right:2px}
@media(max-width:720px){.entry-card{padding:22px;border-radius:24px}.entry-card h1{font-size:25px}.role-choice{grid-template-columns:1fr}.role-card{min-height:108px}.user-pill{max-width:90px}.logout-btn{padding:0 9px}.author-label{font-size:8px}}


/* v9 teacher-presence publishing lock */
.teacher-lock-banner{position:fixed;z-index:80;top:76px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:8px;max-width:calc(100vw - 28px);padding:9px 13px;border:1px solid rgba(180,120,0,.18);border-radius:999px;background:rgba(255,248,224,.94);box-shadow:0 8px 24px rgba(70,50,0,.08);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);font-size:11px;color:#6f591b;white-space:nowrap}
.teacher-lock-banner[hidden]{display:none}
.teacher-lock-dot{width:7px;height:7px;border-radius:50%;background:#e3a008;box-shadow:0 0 0 4px rgba(227,160,8,.12);flex:0 0 auto}
body.publish-locked #toolDock{opacity:.36;pointer-events:none}
body.publish-locked #board{cursor:default}
body.publish-locked .board-item.selected{outline-color:rgba(20,20,30,.22)}
body.publish-locked .board-item.selected::after{display:none}
@media(max-width:720px){.teacher-lock-banner{top:72px;font-size:10px;padding:8px 11px}.teacher-lock-banner strong{font-weight:700}}

/* v10 infinite canvas + collision-safe posts + reactions */
#board{overflow:hidden;touch-action:none;background-image:radial-gradient(circle at 1px 1px,rgba(0,0,0,.07) 1px,transparent 0);background-size:24px 24px;background-position:0 0}
#scene{position:absolute;left:0;top:0;width:100%;height:100%;transform-origin:0 0;overflow:visible;pointer-events:none;will-change:transform}
#scene>.board-item,#scene>.stroke-item,#scene>.author-label,#scene>.reaction-bar,#scene>.object-delete-btn{pointer-events:auto}
#board[data-tool="pan"]{cursor:grab}#board[data-tool="pan"].panning{cursor:grabbing}
.reaction-bar{position:absolute;z-index:7;display:flex;align-items:center;gap:3px;height:27px;padding:3px;border-radius:999px;background:rgba(255,255,255,.96);border:1px solid rgba(20,20,30,.09);box-shadow:0 4px 14px rgba(20,20,30,.08);white-space:nowrap;transform:translateY(5px)}
.reaction-btn{height:20px;min-width:28px;padding:0 6px;border-radius:999px;display:flex;align-items:center;justify-content:center;gap:3px;cursor:pointer;font-size:12px;line-height:1;background:transparent;transition:.12s}
.reaction-btn:hover{background:rgba(0,0,0,.055)}.reaction-btn.active{background:#111;color:#fff}.reaction-btn:disabled{opacity:.45;cursor:default}.reaction-count{font-size:9px;font-weight:700;min-width:7px;text-align:center}
.board-item,.stroke-item{z-index:5}.author-label{z-index:6}
.canvas-help{position:fixed;right:18px;bottom:18px;z-index:35;font-size:10px;color:#777780;background:rgba(255,255,255,.78);border:1px solid rgba(20,20,30,.08);border-radius:999px;padding:6px 9px;pointer-events:none;backdrop-filter:blur(10px)}
body.publish-locked .reaction-btn{pointer-events:none}
@media(max-width:720px){.reaction-bar{height:25px}.reaction-btn{min-width:25px;padding:0 5px}.tool-dock{overflow-x:auto;justify-content:flex-start;left:10px;right:10px;transform:none}.size-wrap{min-width:70px}.canvas-help{display:none}}
body.publish-locked #toolDock{opacity:1;pointer-events:auto}
body.publish-locked #toolDock .tool:disabled,body.publish-locked #toolDock input:disabled{opacity:.28;pointer-events:none}
body.publish-locked #toolDock [data-tool="select"],body.publish-locked #toolDock [data-tool="pan"],body.publish-locked #homeBtn{opacity:1;pointer-events:auto}

/* v12 drag/drop files + explicit image resizing + extended image formats */
.resize-handle{display:none;position:absolute;right:-12px;bottom:-12px;width:23px;height:23px;border-radius:50%;background:#111;border:3px solid #fff;box-shadow:0 3px 12px rgba(0,0,0,.26);cursor:nwse-resize;z-index:14;touch-action:none}
.resize-handle::before{content:'↘';display:grid;place-items:center;width:100%;height:100%;color:#fff;font-size:10px;font-weight:800;line-height:1}
.board-item.selected>.resize-handle{display:block}
.board-item.selected::after,.text-block-item.selected::after{display:none!important}
.image-board-item.selected{outline:2px solid #111;outline-offset:5px}
.file-upload-tool{font-size:15px}
.file-item{display:flex;align-items:center;gap:12px;padding:14px 14px;border-radius:16px;background:rgba(255,255,255,.97);border:1px solid rgba(20,20,30,.10);box-shadow:0 6px 22px rgba(20,20,30,.08);overflow:hidden}
.file-card-icon{width:46px;height:46px;flex:0 0 46px;border-radius:12px;background:#111;color:#fff;display:grid;place-items:center;font-size:10px;font-weight:800;letter-spacing:.02em}
.file-card-meta{min-width:0;flex:1}.file-card-name{font-size:13px;font-weight:700;color:#17171b;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-card-info{font-size:10px;color:#8b8b93;margin-top:5px}
.file-download-btn{flex:0 0 auto;height:30px;padding:0 10px;border-radius:9px;background:rgba(0,0,0,.06);display:inline-flex;align-items:center;text-decoration:none;color:#222;font-size:10px;font-weight:700}.file-download-btn:hover{background:#111;color:#fff}
.drag-over::before{content:'拖曳圖片或檔案到白板';}
body.publish-locked .resize-handle{display:none!important}

/* v13 multi-teacher accounts + admin */
.admin-teachers-btn{height:32px;padding:0 11px;border-radius:10px;background:#111;color:#fff;font-size:11px;font-weight:700;cursor:pointer;white-space:nowrap}.admin-teachers-btn:hover{background:#2a2a2e}.admin-teachers-btn[hidden]{display:none!important}
.teacher-admin-dialog{width:min(940px,calc(100vw - 28px));max-height:min(760px,calc(100vh - 40px));overflow:auto;border-radius:26px;padding:20px;touch-action:auto}
.teacher-admin-form{margin-top:18px;padding:16px;border:1px solid rgba(20,20,30,.09);border-radius:18px;background:rgba(255,255,255,.72)}
.teacher-admin-grid{display:grid;grid-template-columns:1fr 1.25fr 1.2fr .8fr;gap:12px}.teacher-admin-grid label{display:flex;flex-direction:column;gap:7px;font-size:12px;font-weight:650;color:#4d4d55}.teacher-admin-grid input,.teacher-admin-grid select{width:100%;height:46px;border:1px solid rgba(20,20,30,.12);border-radius:13px;background:#fff;color:#111;padding:0 13px;outline:none;font-size:14px;touch-action:auto;user-select:text;-webkit-user-select:text}.teacher-admin-grid input:focus,.teacher-admin-grid select:focus{border-color:#111;box-shadow:0 0 0 3px rgba(0,0,0,.06)}
.teacher-admin-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:12px}.teacher-admin-actions .form-note{margin:0!important;max-width:420px}
.teacher-list-head{display:flex;align-items:center;justify-content:space-between;margin:20px 2px 8px;font-size:12px}.teacher-list-head span{color:var(--muted);font-size:10px}.teacher-list{display:flex;flex-direction:column;gap:7px}.teacher-list-empty{padding:18px;border:1px dashed rgba(20,20,30,.12);border-radius:14px;color:var(--muted);font-size:12px;text-align:center}
.teacher-row{display:grid;grid-template-columns:minmax(230px,1fr) auto auto auto auto;gap:10px;align-items:center;padding:11px 12px;border:1px solid rgba(20,20,30,.08);border-radius:14px;background:rgba(255,255,255,.82)}.teacher-row-main{min-width:0}.teacher-row-id{font-size:13px;font-weight:750;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.teacher-row-meta{margin-top:3px;font-size:10px;color:var(--muted)}.teacher-badge{height:23px;padding:0 8px;border-radius:999px;display:inline-flex;align-items:center;background:rgba(0,0,0,.055);font-size:9px;font-weight:750;color:#555}.teacher-badge.admin{background:#111;color:#fff}.teacher-name-btn,.teacher-email-btn,.teacher-reset-btn{height:30px;padding:0 10px;border-radius:9px;background:rgba(0,0,0,.055);font-size:10px;font-weight:700;cursor:pointer}.teacher-name-btn:hover,.teacher-email-btn:hover,.teacher-reset-btn:hover{background:#111;color:#fff}
@media(max-width:720px){.admin-teachers-btn{padding:0 8px}.teacher-admin-dialog{padding:15px;border-radius:21px}.teacher-admin-grid{grid-template-columns:1fr}.teacher-admin-actions{align-items:flex-end}.teacher-row{grid-template-columns:1fr auto}.teacher-row .teacher-name-btn,.teacher-row .teacher-email-btn,.teacher-row .teacher-reset-btn{grid-column:auto}.top-actions{gap:6px}}


/* v15 teacher classroom list + safe switching */
.teacher-rooms-btn{height:32px;padding:0 11px;border-radius:10px;background:rgba(0,0,0,.055);font-size:11px;font-weight:700;cursor:pointer;white-space:nowrap}.teacher-rooms-btn:hover{background:#111;color:#fff}.teacher-rooms-btn[hidden]{display:none!important}
.teacher-rooms-dialog{width:min(620px,calc(100vw - 28px));max-height:min(720px,calc(100vh - 40px));overflow:auto;border-radius:26px;padding:20px;touch-action:auto}
.teacher-rooms-list{display:flex;flex-direction:column;gap:8px;margin-top:18px}
.teacher-room-row{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px;padding:13px 14px;border:1px solid rgba(20,20,30,.08);border-radius:15px;background:rgba(255,255,255,.84)}
.teacher-room-row.current{border-color:#111;box-shadow:0 0 0 1px #111 inset}.teacher-room-main{min-width:0}.teacher-room-name{font-size:14px;font-weight:760;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.teacher-room-meta{margin-top:4px;font-size:10px;color:var(--muted)}
.teacher-room-open{height:32px;padding:0 11px;border-radius:9px;background:#111;color:#fff;font-size:10px;font-weight:750;cursor:pointer;white-space:nowrap}.teacher-room-open:hover{background:#2a2a2e}.teacher-room-open:disabled{opacity:.45;cursor:default}
@media(max-width:720px){.teacher-rooms-btn{padding:0 8px}.teacher-rooms-dialog{padding:15px;border-radius:21px}.teacher-room-row{grid-template-columns:1fr}.teacher-room-open{width:100%}}

/* v16 separate login ID and public teacher display name */
.entry-form select{appearance:none;-webkit-appearance:none;background:#fff;color:#111;padding:0 38px 0 14px;outline:none;font-size:15px;touch-action:auto;border:1px solid rgba(20,20,30,.12);border-radius:14px;background-image:linear-gradient(45deg,transparent 50%,#777 50%),linear-gradient(135deg,#777 50%,transparent 50%);background-position:calc(100% - 18px) 20px,calc(100% - 13px) 20px;background-size:5px 5px,5px 5px;background-repeat:no-repeat}.entry-form select:disabled{opacity:.6}.teacher-name-btn{padding:0 10px;border-radius:9px;background:rgba(0,0,0,.055);font-size:10px;font-weight:700;cursor:pointer}
@media(max-width:720px){.teacher-row{grid-template-columns:1fr auto}.teacher-row .teacher-name-btn,.teacher-row .teacher-reset-btn{grid-column:1/-1;width:100%}}


/* v17 bilingual + liquid glass language capsule */
.language-glass{height:32px;padding:0 10px;border-radius:999px;border:1px solid rgba(255,255,255,.62);background:linear-gradient(135deg,rgba(255,255,255,.70),rgba(255,255,255,.34));box-shadow:0 6px 20px rgba(20,20,30,.10),inset 0 1px 0 rgba(255,255,255,.78);backdrop-filter:blur(18px) saturate(180%);-webkit-backdrop-filter:blur(18px) saturate(180%);display:inline-flex;align-items:center;gap:5px;font-size:10px;font-weight:760;color:#74747c;cursor:pointer;white-space:nowrap;transition:transform .18s ease,box-shadow .18s ease,background .18s ease}.language-glass:hover{transform:translateY(-1px);box-shadow:0 9px 24px rgba(20,20,30,.14),inset 0 1px 0 rgba(255,255,255,.9)}.language-glass [data-lang]{height:22px;min-width:24px;padding:0 5px;border-radius:999px;display:grid;place-items:center;transition:.18s}.language-glass [data-lang].active{background:rgba(17,17,17,.92);color:#fff;box-shadow:0 2px 8px rgba(0,0,0,.15)}.lang-divider{opacity:.35}.entry-card{position:relative}.entry-language{position:absolute;top:18px;right:18px}.drag-over::before{content:attr(data-drop-label)}.author-label::before{content:attr(data-prefix);font-weight:500;color:#9a9aa1;margin-right:2px}
@media(max-width:720px){.language-glass{height:30px;padding:0 8px}.entry-language{top:14px;right:14px}.top-actions .language-glass{order:-1}.top-actions{flex-wrap:wrap}}
.temporary-badge{position:absolute;left:8px;bottom:8px;z-index:8;max-width:calc(100% - 16px);padding:4px 8px;border-radius:999px;background:rgba(255,248,225,.94);border:1px solid rgba(178,120,0,.18);box-shadow:0 2px 10px rgba(20,20,30,.08);font-size:9px;font-weight:720;color:#8a6200;white-space:nowrap;overflow:visible;pointer-events:none}
.expired-upload{filter:saturate(.35)}
.image-expired-card{width:100%;height:100%;display:grid;place-items:center;align-content:center;gap:8px;border-radius:14px;background:repeating-linear-gradient(135deg,rgba(245,245,247,.98),rgba(245,245,247,.98) 12px,rgba(238,238,241,.98) 12px,rgba(238,238,241,.98) 24px);border:1px dashed rgba(90,90,98,.25);color:#77777f;font-size:13px;text-align:center}
.image-expired-card .expired-icon{font-size:30px;opacity:.7}.image-expired-card strong{font-size:12px}
.file-item.expired-upload{background:rgba(248,248,249,.96);border-style:dashed}.file-item.expired-upload .file-card-info{font-weight:760;color:#9a4b4b}.file-download-btn:disabled{cursor:not-allowed;opacity:.48;background:rgba(0,0,0,.05);color:#777}.file-download-btn:disabled:hover{background:rgba(0,0,0,.05);color:#777}


/* v19 qVsion 3-second cinematic preloader */
.qvsion-splash{position:fixed;inset:0;z-index:100000;overflow:hidden;display:grid;place-items:center;background:#a6abb5;color:#fff;isolation:isolate;opacity:1;visibility:visible;transition:opacity .42s cubic-bezier(.22,.61,.36,1),visibility .42s linear;cursor:wait}
.qvsion-splash.finishing{opacity:0;visibility:hidden;pointer-events:none}
.qvsion-splash::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 50% 46%,rgba(255,255,255,.14),transparent 30%),linear-gradient(115deg,rgba(255,255,255,.06),transparent 42%,rgba(255,255,255,.04));mix-blend-mode:screen;animation:qvsionWash 3s ease-in-out both}
.qvsion-splash-aurora{position:absolute;width:min(70vw,880px);aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.17) 0,rgba(235,242,255,.10) 26%,rgba(210,220,255,.06) 42%,transparent 69%);filter:blur(22px);opacity:.7;animation:qvsionAurora 3s cubic-bezier(.2,.7,.2,1) both}
.qvsion-splash-center{position:relative;z-index:3;display:flex;flex-direction:column;align-items:center;text-align:center;transform:translateY(-4px);animation:qvsionCenterIn 3s cubic-bezier(.2,.8,.2,1) both}
.qvsion-splash-kicker{font:600 9px/1.2 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;letter-spacing:.28em;opacity:.72;margin-bottom:15px}
.qvsion-splash-logo{font:500 clamp(46px,7vw,88px)/.92 -apple-system,BlinkMacSystemFont,"SF Pro Display","Helvetica Neue",Arial,sans-serif;letter-spacing:-.065em;text-shadow:0 8px 34px rgba(255,255,255,.18);animation:qvsionLogoPulse 1.15s ease-in-out infinite alternate}
.qvsion-splash-logo span{font-weight:760;color:#D4AF37;text-shadow:0 0 18px rgba(212,175,55,.32)}
.qvsion-splash-tagline{margin-top:18px;font:560 9px/1.2 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;letter-spacing:.24em;opacity:.92}
.qvsion-splash-system{margin-top:8px;font:500 8px/1.2 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;letter-spacing:.18em;opacity:.48}
.qvsion-orbit{position:absolute;left:50%;top:50%;border:1px solid rgba(255,255,255,.16);border-radius:50%;pointer-events:none}
.qvsion-orbit i{position:absolute;left:50%;top:-3px;width:5px;height:5px;border-radius:50%;background:#fff;box-shadow:0 0 12px rgba(255,255,255,.82)}
.qvsion-orbit.orbit-a{width:min(58vw,620px);height:min(58vw,620px);animation:qvsionOrbitA 3s linear both}
.qvsion-orbit.orbit-b{width:min(42vw,450px);height:min(42vw,450px);border-color:rgba(255,255,255,.10);animation:qvsionOrbitB 3s linear both}
.qvsion-orbit.orbit-b i{left:18%;top:auto;bottom:4%;width:3px;height:3px;opacity:.75}
.qvsion-splash-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(255,255,255,.16);overflow:hidden}
.qvsion-splash-progress span{display:block;width:100%;height:100%;background:#fff;transform-origin:left center;animation:qvsionProgress 2.62s cubic-bezier(.22,.61,.36,1) both}
body.splash-playing{overflow:hidden}
@keyframes qvsionProgress{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes qvsionLogoPulse{from{opacity:.78;filter:blur(.15px)}to{opacity:1;filter:blur(0)}}
@keyframes qvsionCenterIn{0%{opacity:0;transform:translateY(12px) scale(.985)}18%{opacity:1;transform:translateY(-4px) scale(1)}82%{opacity:1;transform:translateY(-4px) scale(1)}100%{opacity:.94;transform:translateY(-6px) scale(1.005)}}
@keyframes qvsionAurora{0%{transform:scale(.72) translateY(18px);opacity:0}28%{opacity:.72}100%{transform:scale(1.12) translateY(-12px);opacity:.38}}
@keyframes qvsionOrbitA{0%{transform:translate(-50%,-50%) rotate(-28deg) scale(.92);opacity:0}20%{opacity:1}100%{transform:translate(-50%,-50%) rotate(152deg) scale(1.04);opacity:.28}}
@keyframes qvsionOrbitB{0%{transform:translate(-50%,-50%) rotate(55deg) scale(.96);opacity:0}24%{opacity:.75}100%{transform:translate(-50%,-50%) rotate(-105deg) scale(1.03);opacity:.18}}
@keyframes qvsionWash{0%{opacity:.25;transform:translateX(-4%)}50%{opacity:.8}100%{opacity:.38;transform:translateX(4%)}}
@media(max-width:720px){.qvsion-splash-logo{font-size:54px}.qvsion-splash-tagline{font-size:7px;letter-spacing:.18em}.qvsion-splash-system{font-size:7px}.qvsion-orbit.orbit-a{width:78vw;height:78vw}.qvsion-orbit.orbit-b{width:58vw;height:58vw}}
@media(prefers-reduced-motion:reduce){.qvsion-splash *{animation-duration:.001ms!important;animation-iteration-count:1!important}.qvsion-splash-progress span{animation-duration:2.62s!important}}

/* v20 streamlined role / classroom entry flow */
.role-select-step{padding-top:2px}.role-select-step label{margin:0}.role-select-step select{font-weight:700;background-color:rgba(255,255,255,.92)}
#teacherExistingRoomsGroup,#teacherNewRoomPanel{display:flex;flex-direction:column;gap:14px}
#teacherExistingRoomsGroup[hidden],#teacherNewRoomPanel[hidden]{display:none!important}
.teacher-room-actions{margin-top:2px}.new-room-panel{padding:14px;border:1px solid rgba(20,20,30,.08);border-radius:16px;background:rgba(255,255,255,.56)}
#teacherClassroomSelect,#studentClassroomName{font-weight:650}
@media(max-width:720px){.entry-card{width:min(520px,calc(100vw - 20px));padding:20px}.entry-actions{flex-wrap:wrap}.entry-actions .primary-btn,.entry-actions .secondary-btn{min-height:44px}.teacher-room-actions .primary-btn,.teacher-room-actions .secondary-btn{flex:1 1 150px}}


/* v20.1 role selection + modal login flow */
.entry-card-compact{width:min(520px,calc(100vw - 28px));}
.entry-form[hidden]{display:none!important}
.entry-flow-backdrop{position:fixed;z-index:420;inset:0;display:grid;place-items:center;padding:20px;background:rgba(24,24,28,.22);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);touch-action:auto}
.entry-flow-backdrop[hidden]{display:none!important}
.entry-flow-dialog{width:min(520px,calc(100vw - 24px));max-height:min(720px,calc(100vh - 32px));overflow:auto;border-radius:26px;padding:22px;touch-action:auto;box-shadow:0 26px 80px rgba(20,20,30,.20)}
.entry-flow-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:18px}.entry-flow-head h2{margin:0;font-size:23px;letter-spacing:-.045em}.entry-flow-head p{margin:5px 0 0;color:var(--muted);font-size:12px;line-height:1.45}.entry-flow-head p:empty{display:none}
.student-entry-form{gap:16px}.student-entry-form .entry-actions{margin-top:4px}.student-entry-form .primary-btn{min-width:118px}
@media(max-width:720px){.entry-card-compact{width:min(500px,calc(100vw - 20px))}.entry-flow-backdrop{padding:10px}.entry-flow-dialog{width:100%;max-height:calc(100vh - 20px);border-radius:22px;padding:18px}.entry-flow-head h2{font-size:21px}}

/* v20.3 — modal sign-in feedback */
.entry-inline-error{margin-top:-2px;padding:10px 12px;border-radius:14px;background:rgba(190,28,28,.08);border:1px solid rgba(190,28,28,.18);color:#a31515;font-size:12px;font-weight:650;line-height:1.45}
.entry-inline-error[hidden]{display:none!important}
.primary-btn.is-loading{opacity:.72;cursor:wait;pointer-events:none}


/* v20.5 — Safari-safe custom role dropdown */
.role-picker-field{display:flex;flex-direction:column;gap:7px;font-size:12px;font-weight:650;color:#4d4d55}
.role-picker{position:relative;isolation:isolate}
.role-native-select{position:absolute!important;width:1px!important;height:1px!important;opacity:0!important;pointer-events:none!important;clip-path:inset(50%)!important;overflow:hidden!important}
.role-picker-trigger{width:100%;height:48px;border:1px solid rgba(20,20,30,.16);border-radius:14px;background:rgba(255,255,255,.94);color:#111;padding:0 44px 0 14px;display:flex;align-items:center;text-align:left;font:700 15px/1 -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",Arial,sans-serif;cursor:pointer;position:relative;box-shadow:0 1px 0 rgba(255,255,255,.85) inset;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease}
.role-picker-trigger:hover{border-color:rgba(20,20,30,.32)}
.role-picker-trigger:focus-visible,.role-picker-trigger[aria-expanded="true"]{outline:none;border-color:#111;box-shadow:0 0 0 3px rgba(0,0,0,.07)}
.role-picker-chevron{position:absolute;right:17px;top:50%;width:9px;height:9px;border-right:2px solid #777;border-bottom:2px solid #777;transform:translateY(-68%) rotate(45deg);transition:transform .18s ease}
.role-picker-trigger[aria-expanded="true"] .role-picker-chevron{transform:translateY(-30%) rotate(225deg)}
.role-picker-menu{position:absolute;z-index:30;left:0;right:0;top:calc(100% + 8px);padding:7px;border-radius:16px;border:1px solid rgba(255,255,255,.74);background:linear-gradient(145deg,rgba(255,255,255,.94),rgba(246,246,249,.84));box-shadow:0 18px 46px rgba(20,20,30,.18),inset 0 1px 0 rgba(255,255,255,.95);backdrop-filter:blur(24px) saturate(170%);-webkit-backdrop-filter:blur(24px) saturate(170%)}
.role-picker-menu[hidden]{display:none!important}
.role-picker-option{width:100%;border:0;background:transparent;border-radius:11px;padding:11px 12px;display:flex;flex-direction:column;align-items:flex-start;gap:4px;color:#111;text-align:left;cursor:pointer;transition:background .16s ease,transform .16s ease}
.role-picker-option+ .role-picker-option{margin-top:3px}
.role-picker-option:hover,.role-picker-option:focus-visible{outline:none;background:rgba(17,17,17,.07)}
.role-picker-option:active{transform:scale(.992)}
.role-picker-option[aria-selected="true"]{background:#111;color:#fff}
.role-picker-option strong{font-size:14px;line-height:1.15;letter-spacing:-.02em}
.role-picker-option span{font-size:10px;line-height:1.35;color:#777}
.role-picker-option[aria-selected="true"] span{color:rgba(255,255,255,.72)}
@media(max-width:720px){.role-picker-trigger{height:52px;font-size:16px}.role-picker-option{padding:13px}.role-picker-option strong{font-size:15px}}

/* v20.33 — teacher-managed assistants and private assistant workspace */
.teacher-assistants-top-btn{height:32px;padding:0 10px;border:1px solid rgba(20,20,30,.08);border-radius:10px;background:rgba(255,255,255,.72);display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:750;cursor:pointer;white-space:nowrap}.teacher-assistants-top-btn:hover{background:#111;color:#fff}.teacher-assistants-top-btn[hidden]{display:none!important}
.assistant-manager-dialog,.assistant-posts-dialog{width:min(900px,calc(100vw - 28px));max-height:min(780px,calc(100vh - 40px));overflow:auto;border-radius:26px;padding:20px;touch-action:auto}.assistant-manager-room{margin:12px 0;padding:10px 13px;border-radius:13px;background:rgba(0,0,0,.05);font-size:12px;font-weight:750}.assistant-create-form{padding:16px;border:1px solid rgba(20,20,30,.09);border-radius:18px;background:rgba(255,255,255,.7)}.assistant-create-grid{display:grid;grid-template-columns:1fr 1.15fr 1.25fr;gap:10px}.assistant-create-grid label,.assistant-post-form label{display:grid;gap:7px;font-size:11px;font-weight:700;color:#555}.assistant-create-grid input,.assistant-post-form textarea{width:100%;border:1px solid rgba(20,20,30,.12);border-radius:13px;background:#fff;color:#111;padding:0 13px;outline:none;font:inherit}.assistant-create-grid input{height:44px}.assistant-post-form textarea{min-height:112px;padding:13px;resize:vertical}.assistant-create-grid input:focus,.assistant-post-form textarea:focus{border-color:#111;box-shadow:0 0 0 3px rgba(0,0,0,.06)}
.assistant-permissions{margin:13px 0 0;padding:12px;border:1px solid rgba(20,20,30,.08);border-radius:14px;display:flex;gap:9px 14px;align-items:center;flex-wrap:wrap}.assistant-permissions legend{padding:0 7px;font-size:11px;font-weight:800}.assistant-permissions label{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700}.assistant-permissions label input{accent-color:#111}.assistant-permissions>span{flex-basis:100%;font-size:10px;color:#777}.assistant-create-actions{display:flex;justify-content:flex-end;margin-top:12px}
.assistant-manager-list{display:flex;flex-direction:column;gap:8px}.assistant-row{padding:13px;border:1px solid rgba(20,20,30,.08);border-radius:15px;background:rgba(255,255,255,.82)}.assistant-row-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.assistant-row-id{font-size:14px;font-weight:800}.assistant-row-meta{font-size:10px;color:#777;margin-top:3px}.assistant-row-actions{display:flex;gap:7px;flex-wrap:wrap}.assistant-row-actions button{height:31px;padding:0 10px;border:0;border-radius:9px;background:rgba(0,0,0,.06);font-size:10px;font-weight:750;cursor:pointer}.assistant-row-actions button:hover{background:#111;color:#fff}.assistant-row-actions .danger-mini-btn:hover{background:#b3261e}.assistant-row .assistant-permissions{margin-top:11px;background:rgba(250,250,251,.8)}
.assistant-post-form{padding:15px;border:1px solid rgba(20,20,30,.09);border-radius:18px;background:rgba(255,255,255,.7);margin-bottom:15px}.assistant-post-file-row{display:flex;align-items:center;gap:12px;margin-top:10px}.assistant-post-file-row>span{font-size:10px;color:#777}.assistant-posts-list{display:flex;flex-direction:column;gap:10px}.assistant-post-card{padding:14px;border:1px solid rgba(20,20,30,.08);border-radius:17px;background:rgba(255,255,255,.84)}.assistant-post-card.public{border-color:rgba(20,130,72,.24);box-shadow:inset 3px 0 0 #18864b}.assistant-post-head{display:flex;justify-content:space-between;gap:12px}.assistant-post-author{display:flex;align-items:center;gap:8px;min-width:0}.assistant-post-role,.assistant-post-visibility{padding:4px 8px;border-radius:999px;background:rgba(0,0,0,.06);font-size:9px;font-weight:800}.assistant-post-visibility.public{background:#e3f5e9;color:#146c3b}.assistant-post-body{white-space:pre-wrap;line-height:1.6;margin:11px 0;font-size:13px}.assistant-post-files{display:flex;gap:7px;flex-wrap:wrap}.assistant-post-file{display:inline-flex;align-items:center;gap:6px;padding:8px 10px;border-radius:10px;background:rgba(0,0,0,.05);font-size:10px;font-weight:700;color:#111;text-decoration:none}.assistant-post-actions{display:flex;justify-content:flex-end;gap:7px;margin-top:10px}.assistant-post-actions button{height:31px;padding:0 10px;border:0;border-radius:9px;background:rgba(0,0,0,.06);font-size:10px;font-weight:750;cursor:pointer}.assistant-post-actions button:hover{background:#111;color:#fff}
body.assistant-no-board #pageBar,body.assistant-no-board #toolDock .tool:not(#attendanceBtn):not(#assistantPostsBtn):not(#personalSubmissionBtn),body.assistant-no-board #toolDock .divider,body.assistant-no-board #toolDock .premium-control{display:none!important}body.assistant-no-board #emptyHint .hint-title{font-size:24px}body.assistant-no-board #emptyHint .hint-sub{max-width:420px;line-height:1.6}.assistant-readonly #toolDock label.upload,.assistant-readonly #toolDock [data-tool]:not([data-tool="select"]):not([data-tool="pan"]){display:none!important}
@media(max-width:760px){.assistant-manager-dialog,.assistant-posts-dialog{padding:15px;border-radius:21px}.assistant-create-grid{grid-template-columns:1fr}.assistant-row-head{flex-direction:column}.assistant-row-actions{width:100%}.assistant-row-actions button{flex:1}.assistant-post-head{flex-direction:column}.teacher-assistants-top-btn span{display:none}}

/* v20.8 create classroom from any active classroom */
.teacher-rooms-top-actions{display:flex;justify-content:flex-end;margin:14px 0 4px}.teacher-room-add{height:38px;padding:0 14px;border-radius:12px;background:#111;color:#fff;font-size:12px;font-weight:760;cursor:pointer}.teacher-room-add:hover{background:#2a2a2e}.teacher-rooms-create-panel{margin-top:12px;padding:14px;border:1px solid rgba(20,20,30,.08);border-radius:16px;background:rgba(255,255,255,.66)}.teacher-rooms-create-panel[hidden]{display:none!important}.teacher-rooms-create-panel label{display:grid;gap:7px;font-size:11px;font-weight:720;color:#555}.teacher-rooms-create-panel input{height:44px;border:1px solid rgba(20,20,30,.12);border-radius:12px;background:#fff;padding:0 12px;font:inherit;font-size:13px;outline:none}.teacher-rooms-create-panel input:focus{border-color:#111;box-shadow:0 0 0 2px rgba(0,0,0,.08)}.teacher-rooms-create-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:10px}.teacher-rooms-create-actions .primary-btn,.teacher-rooms-create-actions .secondary-btn{min-height:38px;padding:0 14px}.teacher-room-add:disabled,.teacher-rooms-create-actions button:disabled{opacity:.5;cursor:default}@media(max-width:720px){.teacher-rooms-top-actions{justify-content:stretch}.teacher-room-add{width:100%}.teacher-rooms-create-actions{flex-direction:column-reverse}.teacher-rooms-create-actions button{width:100%}}
/* v20.9 classroom rename */
.teacher-room-row-actions{display:flex;align-items:center;gap:7px;flex-wrap:wrap;justify-content:flex-end}
.teacher-room-rename{height:32px;padding:0 11px;border-radius:9px;border:1px solid rgba(20,20,30,.10);background:rgba(255,255,255,.9);color:#111;font-size:10px;font-weight:750;cursor:pointer;white-space:nowrap}
.teacher-room-rename:hover{background:#f0f0f2}
.teacher-room-rename:disabled{opacity:.45;cursor:default}
@media(max-width:720px){.teacher-room-row-actions{width:100%;display:grid;grid-template-columns:1fr 1fr}.teacher-room-rename,.teacher-room-open{width:100%}}

/* v20.10 adaptive teacher name capsule + collision-free topbar */
.topbar{
  height:auto;
  min-height:54px;
  flex-wrap:wrap;
  row-gap:8px;
  padding-top:8px;
  padding-bottom:8px;
}
.brand-wrap{
  flex:0 0 auto;
  min-width:0;
}
.top-actions{
  flex:0 1 auto;
  min-width:0;
  margin-left:auto;
  justify-content:flex-end;
  flex-wrap:wrap;
  row-gap:6px;
}
.user-pill{
  width:max-content;
  max-width:none;
  min-width:max-content;
  flex:0 0 auto;
  overflow:visible;
  text-overflow:clip;
  white-space:nowrap;
}
.top-actions > *{
  flex:0 0 auto;
}
@media(max-width:980px){
  .topbar{align-items:center}
  .brand-wrap{max-width:100%}
  .top-actions{width:100%;margin-left:0;justify-content:flex-end}
}
@media(max-width:720px){
  .user-pill{max-width:none;min-width:max-content}
  .topbar{padding-top:7px;padding-bottom:7px}
  .top-actions{gap:6px;overflow-x:auto;flex-wrap:nowrap;scrollbar-width:none;-ms-overflow-style:none}
  .top-actions::-webkit-scrollbar{display:none}
}


/* v20.11 qBoard image logo branding */
.brand-logo-link{display:flex;align-items:center;flex:0 0 auto;text-decoration:none;line-height:0;min-width:0}
.brand-logo{display:block;height:30px;width:auto;max-width:190px;object-fit:contain;mix-blend-mode:multiply}
.entry-brand{margin-bottom:22px;line-height:0}
.entry-brand-logo{display:block;height:38px;width:auto;max-width:min(270px,68vw);object-fit:contain;mix-blend-mode:multiply}
@media(max-width:720px){
  .brand-logo{height:27px;max-width:160px}
  .entry-brand-logo{height:34px;max-width:min(240px,68vw)}
}


/* v20.14 — reliable ownership-aware delete controls */
.object-delete-btn{position:absolute;pointer-events:auto!important;touch-action:manipulation;user-select:none;-webkit-user-select:none;z-index:30;width:24px;height:24px;border:0;border-radius:999px;background:rgba(18,18,18,.92);color:#fff;display:grid;place-items:center;padding:0;font:700 18px/1 -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",Arial,sans-serif;box-shadow:0 5px 14px rgba(0,0,0,.18);cursor:pointer;transform:translate(-50%,-50%);transition:transform .16s ease,background .16s ease,box-shadow .16s ease;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.object-delete-btn:hover{background:#000;transform:translate(-50%,-50%) scale(1.08);box-shadow:0 7px 18px rgba(0,0,0,.24)}
.object-delete-btn:active{transform:translate(-50%,-50%) scale(.94)}
.object-delete-btn:focus-visible{outline:2px solid rgba(17,17,17,.35);outline-offset:2px}
.object-delete-btn.is-deleting,.object-delete-btn:disabled{opacity:.62;cursor:wait;transform:translate(-50%,-50%) scale(.94)}
.object-delete-btn.is-deleting{animation:qboardDeletePulse .75s ease-in-out infinite alternate}
@keyframes qboardDeletePulse{from{box-shadow:0 5px 14px rgba(0,0,0,.16)}to{box-shadow:0 7px 20px rgba(0,0,0,.34)}}
.publish-locked .object-delete-btn{display:none!important}
@media(max-width:720px){.object-delete-btn{width:27px;height:27px;font-size:19px}}

/* v20.15 — bilingual liquid-glass tool bubbles for the bottom toolbar */


/* v20.16 — locally bundled Bootstrap Icons + premium Liquid Glass toolbar */
:root{
  --qboard-gold:#d4af37;
  --qboard-gold-soft:rgba(212,175,55,.28);
  --qboard-toolbar-ink:#17171b;
}
.tool-dock.premium-tool-dock{
  height:64px;
  padding:8px 9px;
  gap:5px;
  border-radius:24px;
  border:1px solid rgba(255,255,255,.88);
  background:
    linear-gradient(145deg,rgba(255,255,255,.91),rgba(242,243,247,.72)),
    radial-gradient(circle at 18% 0,rgba(255,255,255,.82),transparent 48%);
  box-shadow:
    0 22px 60px rgba(18,20,28,.18),
    0 5px 18px rgba(18,20,28,.08),
    inset 0 1px 0 rgba(255,255,255,.98),
    inset 0 -1px 0 rgba(60,62,72,.05);
  backdrop-filter:blur(30px) saturate(180%);
  -webkit-backdrop-filter:blur(30px) saturate(180%);
  isolation:isolate;
}
.tool-dock.premium-tool-dock::before{
  content:"";
  position:absolute;
  inset:1px 12px auto;
  height:1px;
  border-radius:999px;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.95),transparent);
  pointer-events:none;
}
.premium-tool-dock .tool,
.premium-tool-dock .color-wrap{
  position:relative;
  flex:0 0 44px;
  width:44px;
  height:44px;
  border-radius:15px;
  color:var(--qboard-toolbar-ink);
  background:linear-gradient(145deg,rgba(255,255,255,.54),rgba(246,246,249,.26));
  border:1px solid rgba(24,24,30,.055);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.82);
  transition:transform .18s cubic-bezier(.2,.8,.2,1),background .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.premium-tool-dock .tool .bi,
.premium-tool-dock .color-wrap>.bi{
  font-size:19px;
  line-height:1;
  display:block;
  transform:translateZ(0);
}
.premium-tool-dock .tool:hover,
.premium-tool-dock .color-wrap:hover{
  transform:translateY(-2px);
  background:linear-gradient(145deg,rgba(255,255,255,.98),rgba(238,239,243,.82));
  border-color:rgba(20,20,28,.10);
  box-shadow:0 8px 20px rgba(20,22,30,.12),inset 0 1px 0 rgba(255,255,255,1);
}
.premium-tool-dock .tool:active,
.premium-tool-dock .color-wrap:active{
  transform:translateY(0) scale(.95);
  box-shadow:inset 0 1px 3px rgba(20,20,28,.10);
}
.premium-tool-dock .tool:focus-visible,
.premium-tool-dock .color-wrap:focus-visible,
.premium-tool-dock .size-wrap:focus-visible{
  outline:2px solid rgba(17,17,20,.34);
  outline-offset:2px;
}
.premium-tool-dock .tool.active{
  color:#fff;
  background:
    radial-gradient(circle at 28% 18%,rgba(255,255,255,.15),transparent 42%),
    linear-gradient(145deg,#28282d,#101014 72%);
  border-color:rgba(212,175,55,.56);
  box-shadow:
    0 10px 23px rgba(14,14,18,.28),
    0 0 0 1px rgba(212,175,55,.12),
    inset 0 1px 0 rgba(255,255,255,.18),
    inset 0 -1px 0 rgba(0,0,0,.35);
}
.premium-tool-dock .tool.active::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:3px;
  width:12px;
  height:2px;
  border-radius:999px;
  transform:translateX(-50%);
  background:var(--qboard-gold);
  box-shadow:0 0 8px rgba(212,175,55,.48);
}
.premium-tool-dock .divider{
  height:30px;
  margin:0 3px;
  background:linear-gradient(180deg,transparent,rgba(40,42,50,.15) 22%,rgba(40,42,50,.15) 78%,transparent);
}
.premium-tool-dock .highlighter-tool{overflow:hidden}
.premium-tool-dock .highlighter-line{
  position:absolute;
  left:12px;
  right:12px;
  bottom:8px;
  height:3px;
  border-radius:999px;
  background:linear-gradient(90deg,#f7d94c,#ffef8b);
  opacity:.95;
  box-shadow:0 0 8px rgba(247,217,76,.26);
}
.premium-tool-dock .color-wrap{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:0;
  cursor:pointer;
}
.premium-tool-dock .color-wrap>.bi{transform:translate(-2px,-1px)}
.premium-tool-dock .color-swatch{
  position:absolute;
  right:6px;
  bottom:6px;
  width:12px;
  height:12px;
  border:2px solid #fff;
  box-shadow:0 0 0 1px rgba(20,20,28,.16),0 2px 5px rgba(20,20,28,.16);
}
.premium-tool-dock .size-wrap{
  width:102px;
  height:44px;
  flex:0 0 102px;
  padding:0 12px 0 10px;
  gap:8px;
  border-radius:15px;
  border:1px solid rgba(24,24,30,.055);
  background:linear-gradient(145deg,rgba(255,255,255,.54),rgba(246,246,249,.26));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.82);
  transition:background .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.premium-tool-dock .size-wrap:hover{
  background:linear-gradient(145deg,rgba(255,255,255,.98),rgba(238,239,243,.82));
  border-color:rgba(20,20,28,.10);
  box-shadow:0 8px 20px rgba(20,22,30,.10),inset 0 1px 0 rgba(255,255,255,1);
}
.premium-tool-dock .size-wrap>.bi{font-size:15px;color:#56565e;flex:0 0 auto}
.premium-tool-dock .size-wrap input[type="range"]{
  appearance:none;
  -webkit-appearance:none;
  width:100%;
  height:16px;
  margin:0;
  background:transparent;
  cursor:pointer;
}
.premium-tool-dock .size-wrap input[type="range"]::-webkit-slider-runnable-track{
  height:3px;
  border-radius:999px;
  background:linear-gradient(90deg,#242429,#83838c);
}
.premium-tool-dock .size-wrap input[type="range"]::-webkit-slider-thumb{
  appearance:none;
  -webkit-appearance:none;
  width:14px;
  height:14px;
  margin-top:-5.5px;
  border-radius:50%;
  border:2px solid #fff;
  background:#17171b;
  box-shadow:0 2px 7px rgba(0,0,0,.25),0 0 0 1px rgba(0,0,0,.12);
}
.premium-tool-dock .size-wrap input[type="range"]::-moz-range-track{
  height:3px;
  border:0;
  border-radius:999px;
  background:linear-gradient(90deg,#242429,#83838c);
}
.premium-tool-dock .size-wrap input[type="range"]::-moz-range-thumb{
  width:14px;
  height:14px;
  border-radius:50%;
  border:2px solid #fff;
  background:#17171b;
  box-shadow:0 2px 7px rgba(0,0,0,.25),0 0 0 1px rgba(0,0,0,.12);
}
.premium-tool-dock .upload-badge{
  position:absolute;
  right:5px;
  bottom:5px;
  width:14px;
  height:14px;
  display:grid;
  place-items:center;
  border-radius:50%;
  background:#17171b;
  color:#fff;
  border:2px solid rgba(255,255,255,.98);
  font-size:10px;
  font-weight:800;
  line-height:1;
  box-shadow:0 2px 6px rgba(0,0,0,.22);
}
.copy-icon .bi,.icon-btn .bi{display:block;line-height:1}
.icon-btn .bi{font-size:16px}
.tool-bubble{
  background:linear-gradient(145deg,rgba(28,28,33,.97),rgba(10,10,13,.94));
  border-color:rgba(212,175,55,.20);
  box-shadow:0 14px 36px rgba(0,0,0,.28),inset 0 1px 0 rgba(255,255,255,.12);
}
.tool-bubble::after{background:rgba(15,15,18,.97)}
@media(max-width:920px){
  .tool-dock.premium-tool-dock{left:10px;right:10px;transform:none;overflow-x:auto;justify-content:flex-start;scrollbar-width:none;-ms-overflow-style:none}
  .tool-dock.premium-tool-dock::-webkit-scrollbar{display:none}
}
@media(max-width:720px){
  .tool-dock.premium-tool-dock{height:62px;padding:8px;border-radius:22px}
  .premium-tool-dock .tool,.premium-tool-dock .color-wrap{flex-basis:44px;width:44px;height:44px}
  .premium-tool-dock .size-wrap{width:88px;flex-basis:88px;padding-left:9px;padding-right:9px}
}
@media(prefers-reduced-motion:reduce){
  .premium-tool-dock .tool,.premium-tool-dock .color-wrap{transition:none}
}


/* v20.17 — freehand annotation layer */
.ink-item{z-index:14!important;overflow:visible;pointer-events:none!important}
.ink-item .stroke-hit{pointer-events:stroke;cursor:crosshair}
#board[data-tool="eraser"] .ink-item .stroke-hit{cursor:cell}
#board[data-tool="pen"] .ink-item .stroke-hit,#board[data-tool="pencil"] .ink-item .stroke-hit,#board[data-tool="marker"] .ink-item .stroke-hit,#board[data-tool="highlighter"] .ink-item .stroke-hit{cursor:crosshair}

/* v20.18 — system-generated teacher invitations by email */
.teacher-row{grid-template-columns:minmax(220px,1fr) auto auto auto auto}
.teacher-email-btn{height:30px;padding:0 10px;border-radius:9px;background:rgba(0,0,0,.055);font-size:10px;font-weight:700;cursor:pointer;white-space:nowrap}
@media(max-width:900px){.teacher-row{grid-template-columns:minmax(180px,1fr) auto auto}.teacher-row .teacher-email-btn,.teacher-row .teacher-reset-btn{grid-row:2}.teacher-row .teacher-reset-btn{grid-column:3}}
@media(max-width:620px){.teacher-row{grid-template-columns:1fr 1fr}.teacher-row-main{grid-column:1/-1}.teacher-badge{justify-self:start}.teacher-name-btn,.teacher-email-btn,.teacher-reset-btn{width:100%}.teacher-reset-btn{grid-column:1/-1!important}}


/* v20.20 teacher backup, restore, and permanent teacher deletion */
.teacher-rooms-top-actions{justify-content:space-between;gap:10px;flex-wrap:wrap}
.teacher-room-backup{height:38px;padding:0 14px;border:1px solid rgba(20,20,30,.1);border-radius:12px;background:rgba(255,255,255,.78);color:#17171a;display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:760;cursor:pointer;box-shadow:inset 0 1px 0 rgba(255,255,255,.75);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px)}
.teacher-room-backup:hover{background:#111;color:#fff;border-color:#111}.teacher-room-backup:disabled{opacity:.55;cursor:wait}
.teacher-backup-field{grid-column:1/-1}.teacher-backup-field input[type=file]{height:auto!important;min-height:48px;padding:7px 9px!important;line-height:32px;background:rgba(255,255,255,.86)!important}
.teacher-backup-field input[type=file]::file-selector-button{height:32px;margin-right:10px;padding:0 12px;border:0;border-radius:9px;background:#111;color:#fff;font:700 11px/1 -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;cursor:pointer}
.teacher-backup-field small{display:block;color:var(--muted);font-size:10px;line-height:1.55;margin-top:1px}
.teacher-delete-btn{height:30px;padding:0 10px;border:1px solid rgba(190,34,34,.18);border-radius:9px;background:rgba(190,34,34,.075);color:#a51616;font-size:10px;font-weight:760;cursor:pointer;white-space:nowrap}
.teacher-delete-btn:hover{background:#b3261e;border-color:#b3261e;color:#fff}
.teacher-row{grid-template-columns:minmax(220px,1fr) auto auto auto auto auto}
@media(max-width:980px){.teacher-row{grid-template-columns:minmax(180px,1fr) auto auto}.teacher-row .teacher-email-btn,.teacher-row .teacher-reset-btn,.teacher-row .teacher-delete-btn{grid-row:2}.teacher-row .teacher-delete-btn{grid-column:3}}
@media(max-width:620px){.teacher-rooms-top-actions{display:grid;grid-template-columns:1fr}.teacher-room-backup,.teacher-room-add{width:100%;justify-content:center}.teacher-row{grid-template-columns:1fr 1fr}.teacher-row-main{grid-column:1/-1}.teacher-name-btn,.teacher-email-btn,.teacher-reset-btn,.teacher-delete-btn{width:100%;grid-column:auto!important;grid-row:auto!important}.teacher-reset-btn,.teacher-delete-btn{grid-column:1/-1!important}}

/* v20.23 Student account & roster management */
.teacher-room-students{height:34px;padding:0 12px;border-radius:11px;background:rgba(0,0,0,.055);font-size:11px;font-weight:750;display:inline-flex;align-items:center;gap:7px;cursor:pointer}.teacher-room-students:hover{background:#111;color:#fff}
.student-manager-dialog{width:min(920px,calc(100vw - 28px));max-height:min(780px,calc(100vh - 34px));overflow:auto;border-radius:26px;padding:20px;touch-action:auto}
.student-manager-toolbar{display:flex;align-items:end;gap:12px;margin-top:16px}.student-manager-toolbar label{display:flex;flex-direction:column;gap:7px;flex:1;font-size:12px;font-weight:700;color:#4d4d55}.student-manager-toolbar select{height:46px;border:1px solid rgba(20,20,30,.12);border-radius:13px;background:#fff;padding:0 13px;font:inherit}
.student-add-form{display:grid;grid-template-columns:1fr 1.2fr auto;gap:12px;align-items:end;margin-top:14px;padding:14px;border:1px solid rgba(20,20,30,.08);border-radius:16px;background:rgba(255,255,255,.72)}.student-add-form label{display:flex;flex-direction:column;gap:7px;font-size:12px;font-weight:700;color:#4d4d55}.student-add-form input{height:44px;border:1px solid rgba(20,20,30,.12);border-radius:12px;background:#fff;padding:0 12px;font:inherit}.student-form-actions{display:flex;gap:8px}
.student-import-panel{margin-top:14px;padding:14px;border:1px solid rgba(20,20,30,.08);border-radius:16px;background:rgba(255,255,255,.6);display:flex;align-items:center;justify-content:space-between;gap:14px}.student-import-panel>div:first-child{display:flex;flex-direction:column;gap:4px}.student-import-panel strong{font-size:13px}.student-import-panel span{font-size:10px;color:var(--muted)}.student-import-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.student-import-actions input{max-width:260px;font-size:11px}
.student-list-head{display:flex;align-items:center;justify-content:space-between;margin:18px 2px 9px}.student-list-head strong{font-size:13px}.student-list-head span{font-size:10px;color:var(--muted)}.student-manager-list{display:flex;flex-direction:column;gap:8px}.student-row{display:grid;grid-template-columns:minmax(220px,1fr) auto;gap:12px;align-items:center;padding:11px 12px;border:1px solid rgba(20,20,30,.08);border-radius:14px;background:rgba(255,255,255,.82)}.student-row-main{min-width:0;display:flex;flex-direction:column;gap:3px}.student-row-main strong{font-size:13px}.student-row-main span{font-size:10px;color:var(--muted)}.student-row-actions{display:flex;gap:7px;flex-wrap:wrap;justify-content:flex-end}.student-row-actions button{height:31px;padding:0 10px;border-radius:9px;font-size:10px;font-weight:750}.danger-mini-btn{background:rgba(190,30,45,.08);color:#b11;border:1px solid rgba(190,30,45,.13);cursor:pointer}.danger-mini-btn:hover{background:#b11;color:#fff}
.student-password-dialog{width:min(480px,calc(100vw - 28px));border-radius:24px;padding:20px;touch-action:auto}.student-password-form{display:grid;gap:13px;margin-top:16px}.student-password-form label{display:grid;gap:7px;color:#4d4d55;font-size:12px;font-weight:700}.student-password-form input{height:46px;border:1px solid rgba(20,20,30,.12);border-radius:13px;background:#fff;padding:0 13px;font:inherit}.student-password-form p{margin:0;padding:11px 12px;border-radius:12px;background:rgba(20,20,30,.045);color:#70717a;font-size:10px;line-height:1.55}.student-password-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:2px}
@media(max-width:720px){.student-manager-dialog{padding:15px;border-radius:21px}.student-manager-toolbar,.student-import-panel{align-items:stretch;flex-direction:column}.student-add-form{grid-template-columns:1fr}.student-form-actions{justify-content:flex-end}.student-row{grid-template-columns:1fr}.student-row-actions{justify-content:stretch}.student-row-actions button{flex:1}.teacher-room-students{width:100%;justify-content:center}}


/* v20.23 — classroom bulletin / red announcements */
.announcement-btn{position:relative;height:34px;padding:0 12px;border:1px solid rgba(190,28,40,.16);border-radius:999px;background:rgba(255,255,255,.58);color:#b31324;display:inline-flex;align-items:center;gap:7px;font-size:11px;font-weight:800;cursor:pointer;white-space:nowrap;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);box-shadow:inset 0 1px 0 rgba(255,255,255,.86)}
.announcement-btn:hover{background:rgba(181,18,36,.09);border-color:rgba(181,18,36,.25)}.announcement-btn .bi{font-size:14px}.announcement-btn b{min-width:18px;height:18px;padding:0 5px;border-radius:999px;background:#b31324;color:#fff;display:grid;place-items:center;font-size:9px;line-height:1;box-shadow:0 3px 10px rgba(179,19,36,.2)}
.announcement-dialog{width:min(760px,calc(100vw - 28px));max-height:min(820px,calc(100vh - 34px));overflow:auto;border-radius:26px;padding:20px;touch-action:auto}.announcement-head h2{color:#a90f21}.announcement-head p{color:#7f555b}.announcement-form{margin-top:15px;padding:15px;border:1px solid rgba(178,22,39,.10);border-radius:18px;background:linear-gradient(145deg,rgba(255,255,255,.88),rgba(255,246,247,.72))}.announcement-form>label{display:flex;flex-direction:column;gap:8px;color:#951526;font-size:12px;font-weight:800}.announcement-form textarea{width:100%;min-height:112px;resize:vertical;border:1px solid rgba(178,22,39,.14);border-radius:14px;background:#fff;padding:12px 13px;color:#b31324;font:600 14px/1.65 -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;outline:none}.announcement-form textarea:focus{border-color:rgba(178,22,39,.38);box-shadow:0 0 0 3px rgba(178,22,39,.06)}
.announcement-file-row{display:flex;align-items:center;gap:10px;margin-top:11px;flex-wrap:wrap}.announcement-file-picker{height:36px;padding:0 12px;border:1px solid rgba(178,22,39,.14);border-radius:11px;background:#fff;color:#9e1322;display:inline-flex!important;flex-direction:row!important;align-items:center;gap:7px!important;cursor:pointer!important;font-size:11px!important}.announcement-file-picker:hover{background:#fff2f3}.announcement-file-summary{font-size:10px;color:#8b6a6e}.announcement-form-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:12px}.announcement-publish-btn{background:#a81324!important}.announcement-publish-btn:hover{background:#8e0d1c!important}
.announcement-list{display:flex;flex-direction:column;gap:12px;margin-top:15px}.announcement-card{padding:15px 16px;border:1px solid rgba(175,22,39,.11);border-radius:17px;background:rgba(255,255,255,.87);box-shadow:0 8px 26px rgba(40,10,15,.045),inset 0 1px 0 rgba(255,255,255,.95)}.announcement-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.announcement-card-head>div:first-child{display:flex;flex-direction:column;gap:3px}.announcement-card-head strong{font-size:10px;color:#8f4b54}.announcement-card-head span{font-size:9px;color:#a1878a}.announcement-manage{display:flex;gap:6px}.announcement-manage button{height:29px;padding:0 9px;font-size:9px;border-radius:9px}.announcement-body{margin-top:10px;color:#c1122d;font-size:15px;font-weight:720;line-height:1.7;white-space:normal;overflow-wrap:anywhere}.announcement-files{display:flex;flex-direction:column;gap:7px;margin-top:12px}.announcement-file{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 10px;border:1px solid rgba(30,30,40,.075);border-radius:12px;background:rgba(248,248,250,.78)}.announcement-file.expired{opacity:.67}.announcement-file-main{min-width:0;display:flex;align-items:center;gap:9px}.announcement-file-main>.bi{color:#9f1c2a;font-size:14px}.announcement-file-main>div{min-width:0;display:flex;flex-direction:column;gap:2px}.announcement-file-main strong{font-size:10px;color:#34343a;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:430px}.announcement-file-main span{font-size:9px;color:#8a8a91}.announcement-file-actions{display:flex;align-items:center;gap:6px;flex-shrink:0}.announcement-file-download{height:28px;padding:0 9px;border-radius:8px;background:#111;color:#fff;display:inline-flex;align-items:center;gap:5px;text-decoration:none;font-size:9px;font-weight:750}.announcement-file-remove{width:28px;height:28px;border-radius:8px;background:rgba(180,20,38,.08);color:#a31324;border:1px solid rgba(180,20,38,.12);font-size:17px;cursor:pointer}.announcement-file-remove:hover{background:#aa1122;color:#fff}.announcement-file-expired{font-size:9px;font-weight:800;color:#ad1a2b}.announcement-empty{min-height:150px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:#a58c90}.announcement-empty .bi{font-size:26px;color:#b31324}.announcement-empty span{font-size:11px}.announcement-file-picker input{display:none!important}
@media(max-width:720px){.announcement-dialog{padding:15px;border-radius:21px}.announcement-card-head{flex-direction:column}.announcement-manage{width:100%}.announcement-manage button{flex:1}.announcement-file{align-items:flex-start;flex-direction:column}.announcement-file-actions{width:100%;justify-content:flex-end}.announcement-file-main strong{max-width:70vw}.announcement-btn span{display:none}.announcement-btn{width:34px;padding:0;justify-content:center}.announcement-btn b{position:absolute;right:-4px;top:-5px}}


/* v20.25 — bulletin questions & teacher answers */
.announcement-discussion{margin-top:14px;padding-top:13px;border-top:1px solid rgba(35,35,45,.08)}
.qa-title{display:flex;align-items:center;gap:7px;color:#34343a;font-size:11px;font-weight:850;margin-bottom:9px}.qa-title b{min-width:20px;height:20px;padding:0 6px;border-radius:999px;background:rgba(179,19,36,.08);color:#a71325;display:grid;place-items:center;font-size:9px}.qa-empty{padding:10px 12px;border-radius:11px;background:rgba(248,248,250,.75);color:#999;font-size:10px}.qa-question{position:relative;padding:11px 12px;margin-top:8px;border:1px solid rgba(35,35,45,.08);border-radius:13px;background:rgba(249,249,251,.9)}.qa-meta{display:flex;align-items:center;gap:7px;min-height:20px}.qa-meta strong{font-size:10px;color:#45454b}.qa-meta time{font-size:8px;color:#9b9ba1;margin-left:auto}.qa-question-icon{width:18px;height:18px;border-radius:50%;display:grid;place-items:center;background:#17171a;color:#fff;font-size:10px;font-weight:900}.qa-text{margin-top:7px;color:#36363b;font-size:12px;line-height:1.6;overflow-wrap:anywhere}.qa-answers{display:flex;flex-direction:column;gap:7px;margin:9px 0 0 20px}.qa-answer{position:relative;padding:10px 11px;border-left:3px solid #b31324;border-radius:10px;background:#fff}.qa-answer .qa-text{color:#6e202a}.qa-teacher-badge{height:18px;padding:0 7px;border-radius:999px;background:#b31324;color:#fff;display:inline-flex;align-items:center;font-size:8px;font-weight:850}.qa-question-form,.qa-answer-form{display:flex;gap:7px;align-items:flex-end;margin-top:10px}.qa-question-form textarea,.qa-answer-form textarea{flex:1;min-height:42px;max-height:120px;resize:vertical;border:1px solid rgba(35,35,45,.1);border-radius:11px;background:#fff;padding:9px 10px;color:#333;font:600 11px/1.45 -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;outline:none}.qa-question-form textarea:focus,.qa-answer-form textarea:focus{border-color:rgba(179,19,36,.32);box-shadow:0 0 0 3px rgba(179,19,36,.05)}.qa-answer-form{margin-left:20px}.qa-send-btn{height:34px;padding:0 11px;border:0;border-radius:10px;background:#17171a;color:#fff;font-size:9px;font-weight:800;cursor:pointer;white-space:nowrap}.qa-send-btn:hover{background:#a81324}.qa-send-btn:disabled{opacity:.45;cursor:wait}.qa-delete{width:22px;height:22px;border:0;border-radius:7px;background:transparent;color:#aaa;font-size:15px;line-height:1;cursor:pointer;margin-left:2px}.qa-delete:hover{background:rgba(179,19,36,.09);color:#a81324}.qa-disabled{margin-top:10px;padding:9px 11px;border-radius:10px;background:rgba(50,50,55,.045);color:#96969c;font-size:9px;display:flex;align-items:center;gap:6px}
@media(max-width:720px){.qa-question-form,.qa-answer-form{flex-direction:column;align-items:stretch}.qa-answer-form,.qa-answers{margin-left:10px}.qa-send-btn{align-self:flex-end}.qa-meta{flex-wrap:wrap}.qa-meta time{margin-left:0;width:100%}}


/* v20.28 — private personal-response blocks */
.personal-submission-item{background:linear-gradient(150deg,rgba(255,255,255,.96),rgba(246,247,252,.92));border:1px solid rgba(28,33,50,.11);border-radius:20px;box-shadow:0 14px 34px rgba(24,28,45,.11),inset 0 1px 0 rgba(255,255,255,.96);overflow:hidden;display:flex;flex-direction:column;padding:15px;min-width:340px;min-height:210px}
.personal-submission-head{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:start;gap:10px}.personal-submission-icon{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;background:#15161a;color:#fff;box-shadow:0 7px 18px rgba(20,22,30,.18)}.personal-submission-icon .bi{font-size:16px}.personal-submission-heading{min-width:0;display:flex;flex-direction:column;gap:3px}.personal-submission-heading span{font-size:9px;font-weight:850;letter-spacing:.09em;text-transform:uppercase;color:#82838c}.personal-submission-heading strong{font-size:15px;line-height:1.25;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.personal-submission-status{height:24px;padding:0 9px;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;font-size:9px;font-weight:850;white-space:nowrap}.personal-submission-status.open{background:rgba(30,150,90,.1);color:#16834f;border:1px solid rgba(30,150,90,.13)}.personal-submission-status.closed{background:rgba(80,80,90,.075);color:#75757d;border:1px solid rgba(80,80,90,.1)}.personal-submission-body{flex:1;margin-top:13px;padding:11px 12px;border-radius:13px;background:rgba(255,255,255,.72);border:1px solid rgba(30,34,48,.065);font-size:12px;line-height:1.55;white-space:pre-wrap;overflow:hidden;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:4}.personal-submission-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px}.personal-submission-counts{font-size:9px;color:#85858e;font-weight:700}.personal-submission-open{height:31px;padding:0 11px;border-radius:10px;background:#16171b;color:#fff;display:inline-flex;align-items:center;gap:6px;font-size:9px;font-weight:820;cursor:pointer;touch-action:manipulation}.personal-submission-open:hover{background:#34353b}
.personal-prompt-create-dialog{width:min(660px,calc(100vw - 28px));border-radius:25px;padding:19px;touch-action:auto}.personal-prompt-create-form{display:flex;flex-direction:column;gap:13px}.personal-prompt-create-form label{display:flex;flex-direction:column;gap:7px;font-size:11px;font-weight:800;color:#4c4d55}.personal-prompt-create-form input,.personal-prompt-create-form textarea{width:100%;border:1px solid rgba(25,28,42,.12);border-radius:14px;background:#fff;color:#17181c;padding:11px 13px;outline:none;font:600 13px/1.55 -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;touch-action:auto;user-select:text;-webkit-user-select:text}.personal-prompt-create-form textarea{min-height:170px;resize:vertical}.personal-prompt-create-form input:focus,.personal-prompt-create-form textarea:focus{border-color:rgba(25,28,42,.38);box-shadow:0 0 0 3px rgba(25,28,42,.055)}.personal-prompt-create-actions{display:flex;align-items:center;justify-content:space-between;gap:15px}.personal-prompt-create-actions>span{font-size:9px;color:#85858e;line-height:1.5;max-width:330px}.personal-prompt-create-actions>div{display:flex;gap:8px;flex-shrink:0}
.personal-prompt-detail-dialog{width:min(820px,calc(100vw - 28px));max-height:min(840px,calc(100vh - 34px));overflow:auto;border-radius:26px;padding:20px;touch-action:auto}.personal-prompt-detail{display:flex;flex-direction:column;gap:15px}.personal-prompt-summary{padding:16px;border:1px solid rgba(27,31,45,.09);border-radius:18px;background:linear-gradient(145deg,rgba(255,255,255,.91),rgba(247,248,252,.83))}.personal-prompt-summary-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.personal-prompt-summary h3{margin:12px 0 0;font-size:18px;letter-spacing:-.025em}.personal-prompt-summary p{margin:8px 0 0;color:#44464f;font-size:13px;line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere}.personal-prompt-summary small{margin-top:12px;display:flex;align-items:center;gap:7px;color:#84858e;font-size:9px;line-height:1.45}.personal-response-list-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:1px 2px 0}.personal-response-list-head strong{font-size:12px}.personal-response-list-head>span{font-size:9px;color:#888991}.personal-response-list{display:flex;flex-direction:column;gap:9px}.personal-response-card{padding:13px 14px;border:1px solid rgba(28,32,46,.085);border-radius:15px;background:rgba(255,255,255,.88);box-shadow:0 6px 18px rgba(24,28,42,.045)}.personal-response-meta{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.personal-response-meta>div{display:flex;flex-direction:column;gap:2px}.personal-response-meta strong{font-size:12px}.personal-response-meta span,.personal-response-meta time{font-size:8px;color:#92939b}.personal-response-answer{margin-top:10px;padding:10px 11px;border-radius:11px;background:rgba(246,247,250,.8);font-size:12px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere;user-select:text;-webkit-user-select:text}.personal-response-actions{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:9px}.personal-response-visibility{height:22px;padding:0 8px;border-radius:999px;display:inline-flex;align-items:center;gap:5px;font-size:8px;font-weight:800}.personal-response-visibility.public{background:rgba(25,145,86,.09);color:#147c4b}.personal-response-visibility.private{background:rgba(60,61,70,.07);color:#72737b}.personal-response-toggle{height:29px;padding:0 10px;border:1px solid rgba(30,33,46,.1);border-radius:9px;background:#fff;color:#45464d;display:inline-flex;align-items:center;gap:6px;font-size:9px;font-weight:800;cursor:pointer}.personal-response-toggle:hover,.personal-response-toggle.is-public{background:#17181c;color:#fff}.personal-own-response{padding:15px;border:1px solid rgba(30,34,48,.09);border-radius:17px;background:rgba(255,255,255,.86)}.personal-own-response textarea{width:100%;min-height:150px;margin-top:10px;resize:vertical;border:1px solid rgba(30,34,48,.12);border-radius:13px;background:#fff;padding:12px 13px;outline:none;color:#22232a;font:600 12px/1.6 -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;touch-action:auto;user-select:text;-webkit-user-select:text}.personal-own-response textarea:focus{border-color:rgba(25,28,42,.36);box-shadow:0 0 0 3px rgba(25,28,42,.05)}.personal-own-response textarea:disabled{background:#f5f5f7;color:#777}.personal-own-response-actions{display:flex;justify-content:flex-end;margin-top:10px}.personal-response-disabled{margin-top:8px;display:flex;align-items:center;gap:7px;color:#8b8c94;font-size:9px}.public-list .personal-response-actions{justify-content:flex-start}
@media(max-width:720px){.personal-prompt-create-dialog,.personal-prompt-detail-dialog{padding:15px;border-radius:21px}.personal-prompt-create-actions{align-items:stretch;flex-direction:column}.personal-prompt-create-actions>div{justify-content:flex-end}.personal-response-meta{flex-direction:column;gap:4px}.personal-response-actions{align-items:flex-start;flex-direction:column}.personal-response-toggle{width:100%;justify-content:center}.personal-submission-counts{max-width:55%;line-height:1.3}.personal-submission-open span{display:none}.personal-submission-open{width:32px;padding:0;justify-content:center}}

/* v20.29 - Student management + PDF roster preview */
.teacher-students-top-btn{height:32px;padding:0 11px;border:1px solid rgba(20,20,30,.08);border-radius:10px;background:rgba(255,255,255,.58);font-size:11px;font-weight:750;display:inline-flex;align-items:center;gap:7px;cursor:pointer;white-space:nowrap;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:inset 0 1px 0 rgba(255,255,255,.8)}
.teacher-students-top-btn:hover{background:#111;color:#fff;border-color:#111}
.teacher-students-top-btn[hidden]{display:none!important}
.teacher-students-top-btn .bi{font-size:13px}
@media(max-width:720px){.teacher-students-top-btn{padding:0 8px}.teacher-students-top-btn span{display:none}.teacher-students-top-btn{width:32px;justify-content:center}}

/* v20.29 — editable PDF student roster preview */
.student-pdf-preview{width:100%;margin-top:12px;padding:12px;border:1px solid rgba(20,20,30,.09);border-radius:16px;background:rgba(250,250,252,.78);box-shadow:inset 0 1px 0 rgba(255,255,255,.9)}
.student-pdf-preview-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.student-pdf-preview-head>div:first-child{display:flex;flex-direction:column;gap:3px}.student-pdf-preview-head strong{font-size:13px}.student-pdf-preview-head span{font-size:10px;color:var(--muted)}.student-pdf-preview-actions{display:flex;gap:7px;flex-wrap:wrap}
.student-pdf-preview-rows{display:flex;flex-direction:column;gap:6px;max-height:310px;overflow:auto;padding-right:4px}.student-pdf-preview-row{display:grid;grid-template-columns:38px minmax(120px,.8fr) minmax(150px,1.2fr) 34px;gap:7px;align-items:center;padding:7px;border:1px solid rgba(20,20,30,.07);border-radius:12px;background:rgba(255,255,255,.82)}.student-pdf-preview-row .row-index{font-size:10px;color:var(--muted);text-align:center}.student-pdf-preview-row input{width:100%;min-width:0;border:1px solid rgba(20,20,30,.10);border-radius:9px;background:white;padding:8px 9px;font:inherit;font-size:11px}.student-pdf-preview-remove{width:30px;height:30px;border:0;border-radius:9px;background:rgba(220,38,38,.08);color:#b91c1c;font-weight:800;cursor:pointer}.student-pdf-preview-hint{margin:9px 2px 0;font-size:10px;color:var(--muted)}
@media(max-width:720px){.student-pdf-preview-head{align-items:stretch;flex-direction:column}.student-pdf-preview-row{grid-template-columns:28px 1fr 1fr 30px}.student-pdf-preview-row input{font-size:10px;padding:7px}}

/* qBoard v20.30 — attendance */
.attendance-tool{position:relative}.attendance-open-dot{position:absolute;right:7px;top:7px;width:7px;height:7px;border-radius:50%;background:#19a05c;box-shadow:0 0 0 3px rgba(25,160,92,.13)}
.attendance-dialog{width:min(980px,calc(100vw - 28px));max-height:min(860px,calc(100vh - 34px));overflow:auto;border-radius:26px;padding:20px;touch-action:auto}
.attendance-teacher-controls{display:grid;grid-template-columns:minmax(180px,1fr) 140px minmax(280px,auto);gap:12px;align-items:end;margin:14px 0 16px;padding:13px;border:1px solid rgba(25,28,42,.08);border-radius:17px;background:rgba(255,255,255,.76)}
.attendance-teacher-controls label{display:flex;flex-direction:column;gap:6px;font-size:10px;font-weight:800;color:#585963}.attendance-teacher-controls input,.attendance-teacher-controls select{height:42px;border:1px solid rgba(25,28,42,.12);border-radius:12px;background:#fff;padding:0 12px;font:650 12px -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;color:#202126;outline:none}.attendance-teacher-controls input:focus,.attendance-teacher-controls select:focus{border-color:rgba(25,28,42,.34);box-shadow:0 0 0 3px rgba(25,28,42,.05)}
.attendance-control-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}.attendance-status{height:28px;padding:0 10px;border-radius:999px;display:inline-flex;align-items:center;gap:6px;font-size:9px;font-weight:850;background:rgba(85,86,95,.08);color:#73747d}.attendance-status.open{background:rgba(25,160,92,.1);color:#147b49}.attendance-status.open::before{content:"";width:6px;height:6px;border-radius:50%;background:#19a05c}.attendance-status.closed::before{content:"";width:6px;height:6px;border-radius:50%;background:#a1a2aa}
.attendance-student-header{display:flex;justify-content:flex-start;margin:12px 0}.attendance-content{min-height:170px;border:1px solid rgba(25,28,42,.08);border-radius:17px;overflow:auto;background:rgba(255,255,255,.82)}
.attendance-table{width:100%;border-collapse:separate;border-spacing:0;min-width:620px}.attendance-table th,.attendance-table td{padding:11px 12px;border-bottom:1px solid rgba(25,28,42,.07);text-align:center;font-size:11px}.attendance-table th{position:sticky;top:0;z-index:2;background:rgba(246,247,249,.97);font-size:9px;color:#6d6e77;font-weight:850;letter-spacing:.02em}.attendance-table th:nth-child(1),.attendance-table td:nth-child(1){text-align:left;width:130px}.attendance-table th:nth-child(2),.attendance-table td:nth-child(2){text-align:left;min-width:150px}.attendance-table tr:last-child td{border-bottom:0}.attendance-table tbody tr:hover td{background:rgba(248,249,251,.78)}
.attendance-check{appearance:none;-webkit-appearance:none;width:25px;height:25px;border-radius:8px;border:1.5px solid rgba(48,51,62,.22);background:#fff;display:inline-grid;place-items:center;cursor:pointer;transition:.15s ease;vertical-align:middle}.attendance-check:checked{background:#17181c;border-color:#17181c}.attendance-check:checked::after{content:"✓";color:#fff;font-size:14px;font-weight:900;line-height:1}.attendance-check:disabled{cursor:not-allowed;opacity:.45;background:#f1f1f3}.attendance-check:checked:disabled{background:#777980;border-color:#777980;opacity:.8}.attendance-check.teacher-adjusted{box-shadow:0 0 0 3px rgba(212,175,55,.13)}
.attendance-student-card{padding:18px;display:grid;grid-template-columns:minmax(180px,1fr) repeat(4,minmax(80px,110px));gap:10px;align-items:center}.attendance-student-identity{display:flex;flex-direction:column;gap:4px}.attendance-student-identity strong{font-size:14px}.attendance-student-identity span{font-size:10px;color:#85868f}.attendance-period-card{min-height:72px;border:1px solid rgba(25,28,42,.08);border-radius:14px;background:#fafafb;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px}.attendance-period-card span{font-size:9px;font-weight:800;color:#6e6f77}
.attendance-footer{margin-top:10px;color:#8b8c95;font-size:9px;line-height:1.5}.attendance-empty{padding:40px 18px;text-align:center;color:#8c8d95;font-size:11px}.attendance-summary{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 2px 9px;color:#777881;font-size:9px}.attendance-summary strong{color:#33343a;font-size:10px}.attendance-absence-panel{margin:14px 12px 12px;padding:14px;border:1px solid rgba(198,46,46,.16);border-radius:16px;background:rgba(255,245,245,.88)}.attendance-absence-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.attendance-absence-head strong{font-size:12px;color:#b42323}.attendance-absence-head>span{font-size:9px;font-weight:800;color:#b42323;background:rgba(198,46,46,.08);padding:5px 8px;border-radius:999px}.attendance-absence-list{display:grid;gap:7px}.attendance-absence-item{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:10px 11px;border-radius:12px;background:#fff;border:1px solid rgba(198,46,46,.10)}.attendance-absence-person{display:flex;align-items:baseline;gap:8px;min-width:0}.attendance-absence-person strong{font-size:11px;color:#2d2e33}.attendance-absence-person span{font-size:9px;color:#85868f}.attendance-absence-periods{font-size:9px;font-weight:800;color:#c02d2d;text-align:right}.attendance-absence-panel.all-present{border-color:rgba(25,160,92,.15);background:rgba(244,252,248,.9)}.attendance-absence-panel.all-present .attendance-absence-head{margin-bottom:0}.attendance-all-present{color:#147b49!important;background:rgba(25,160,92,.09)!important}
#scene>.attendance-board-workspace{pointer-events:auto!important}.attendance-board-workspace{position:absolute;left:650px;top:92px;width:760px;height:620px;z-index:69;display:flex;flex-direction:column;overflow:hidden;border:1px solid rgba(255,255,255,.84);border-radius:27px;background:linear-gradient(145deg,rgba(255,255,255,.95),rgba(245,249,247,.9));box-shadow:0 24px 70px rgba(20,23,34,.17),inset 0 1px 0 rgba(255,255,255,.96);backdrop-filter:blur(28px) saturate(155%);-webkit-backdrop-filter:blur(28px) saturate(155%);touch-action:auto;user-select:text;-webkit-user-select:text}.attendance-board-workspace[hidden]{display:none!important}.attendance-board-workspace.is-collapsed{height:76px}.attendance-board-head{min-height:76px;padding:14px 15px 13px 16px;display:flex;align-items:center;justify-content:space-between;gap:14px;border-bottom:1px solid rgba(25,28,42,.08);background:linear-gradient(180deg,rgba(255,255,255,.74),rgba(255,255,255,.44));flex:0 0 auto}.attendance-board-heading{display:flex;align-items:center;gap:11px;min-width:0}.attendance-board-icon{width:38px;height:38px;border-radius:13px;display:grid;place-items:center;flex:0 0 auto;background:#157b49;color:#fff;box-shadow:0 7px 18px rgba(15,112,65,.2)}.attendance-board-heading h2{margin:0;color:#202126;font-size:15px;letter-spacing:-.02em}.attendance-board-heading p{margin:4px 0 0;max-width:390px;color:#7b7d86;font-size:8px;line-height:1.45}.attendance-board-actions{display:flex;align-items:center;gap:7px;flex:0 0 auto}.attendance-board-settings,.attendance-board-collapse{width:34px;height:34px;border:1px solid rgba(25,28,42,.09);border-radius:11px;background:rgba(255,255,255,.82);color:#30323a;display:grid;place-items:center;cursor:pointer}.attendance-board-settings:hover,.attendance-board-collapse:hover{background:#17181c;color:#fff}.attendance-board-collapse i{transition:transform .18s ease}.attendance-board-workspace.is-collapsed .attendance-board-collapse i{transform:rotate(180deg)}.attendance-board-body{min-height:0;flex:1;display:flex;flex-direction:column;padding:13px}.attendance-board-body[hidden]{display:none!important}.attendance-board-body>.attendance-content{min-height:0;flex:1;overscroll-behavior:contain;background:rgba(255,255,255,.86)}.attendance-board-body>.attendance-footer{flex:0 0 auto}.attendance-board-workspace .attendance-summary{padding:10px 12px 0}.attendance-board-workspace .attendance-student-card{min-height:210px}.attendance-board-workspace:focus-within{border-color:rgba(25,123,73,.25);box-shadow:0 25px 78px rgba(20,23,34,.2),0 0 0 4px rgba(25,123,73,.05)}
/* qBoard v20.43 — reusable transform controls with continuous panel collision reconciliation */
.board-transformable-workspace{min-width:360px;min-height:300px}.board-transformable-workspace.can-transform [data-board-workspace-head]{cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none}.board-transformable-workspace.is-transforming{transition:none;box-shadow:0 30px 88px rgba(20,23,34,.24),0 0 0 4px rgba(25,123,73,.07);will-change:left,top,width,height}.board-transformable-workspace.is-transforming [data-board-workspace-head]{cursor:grabbing}.board-workspace-move{width:36px;height:36px;border:1px solid rgba(25,28,42,.1);border-radius:11px;background:#17181c;color:#fff;display:grid;place-items:center;cursor:grab;touch-action:none;flex:0 0 auto;box-shadow:0 6px 15px rgba(16,18,26,.16)}.board-workspace-move:hover{background:#34363c}.board-workspace-move:active{cursor:grabbing}.board-workspace-move[hidden]{display:none!important}.board-workspace-resize{position:absolute;z-index:90;width:34px;height:34px;border:3px solid #fff;border-radius:50%;background:#17181c;color:#fff;display:grid;place-items:center;touch-action:none;box-shadow:0 5px 16px rgba(18,20,28,.3);opacity:.94}.board-workspace-resize.nw{left:5px;top:5px;cursor:nwse-resize}.board-workspace-resize.ne{right:5px;top:5px;cursor:nesw-resize}.board-workspace-resize.sw{left:5px;bottom:5px;cursor:nesw-resize}.board-workspace-resize.se{right:5px;bottom:5px;cursor:nwse-resize}.board-workspace-resize.nw::after,.board-workspace-resize.ne::after,.board-workspace-resize.sw::after{content:"";width:10px;height:10px;border-style:solid;border-color:#fff;transform:rotate(45deg)}.board-workspace-resize.nw::after{border-width:2px 0 0 2px}.board-workspace-resize.ne::after{border-width:2px 2px 0 0}.board-workspace-resize.sw::after{border-width:0 0 2px 2px}.board-workspace-resize:hover{background:#000;transform:scale(1.12);opacity:1}.board-workspace-resize i{font-size:12px;pointer-events:none}.board-workspace-resize[hidden],.board-transformable-workspace.is-collapsed .board-workspace-resize{display:none!important}.board-transformable-workspace.is-collapsed{height:76px!important;min-height:76px!important}

@media(max-width:760px){.attendance-absence-item{align-items:flex-start;flex-direction:column;gap:5px}.attendance-absence-periods{text-align:left}.attendance-dialog{padding:15px;border-radius:21px}.attendance-teacher-controls{grid-template-columns:1fr}.attendance-control-actions{justify-content:flex-start}.attendance-student-card{grid-template-columns:1fr 1fr}.attendance-student-identity{grid-column:1/-1}.attendance-content{overflow-x:auto}}

/* v20.32 multi-page whiteboard */
.page-bar{position:fixed;z-index:46;top:78px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:8px;width:min(760px,calc(100vw - 36px));min-height:44px;padding:6px 7px;border-radius:18px;background:rgba(248,248,250,.78);border:1px solid rgba(255,255,255,.75);box-shadow:0 10px 30px rgba(20,22,32,.08);backdrop-filter:blur(22px) saturate(150%);-webkit-backdrop-filter:blur(22px) saturate(150%)}
.page-bar[hidden]{display:none}.page-tabs{display:flex;align-items:center;gap:6px;min-width:0;flex:1;overflow-x:auto;overflow-y:hidden;scrollbar-width:none;padding:1px}.page-tabs::-webkit-scrollbar{display:none}
.page-tab{appearance:none;border:1px solid transparent;background:transparent;color:#5b5e68;height:32px;padding:0 13px;border-radius:12px;font:650 12px/1 -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;white-space:nowrap;cursor:pointer;transition:background .18s ease,color .18s ease,box-shadow .18s ease,border-color .18s ease}.page-tab:hover{background:rgba(255,255,255,.8);color:#17181d}.page-tab.active{background:#17181d;color:#fff;border-color:rgba(0,0,0,.08);box-shadow:0 6px 16px rgba(15,16,22,.15)}
.page-teacher-actions{display:flex;gap:5px;flex:0 0 auto;padding-left:2px}.page-teacher-actions[hidden]{display:none}.page-action-btn{width:32px;height:32px;border:1px solid rgba(20,20,30,.08);border-radius:11px;background:rgba(255,255,255,.8);display:grid;place-items:center;color:#333843;cursor:pointer;box-shadow:0 3px 10px rgba(20,22,30,.05)}.page-action-btn:hover{background:#fff;transform:translateY(-1px)}.page-action-btn.primary{background:#17181d;color:#fff;border-color:#17181d}.page-action-btn i{font-size:14px}
body.publish-locked .page-bar{top:118px}.page-name-dialog{width:min(430px,calc(100vw - 28px));border-radius:24px;padding:20px}.page-name-field{display:grid;gap:7px;margin-top:16px}.page-name-field span{font-size:11px;font-weight:700;color:#737782}.page-name-field input{height:44px;border:1px solid rgba(20,20,30,.1);border-radius:13px;background:rgba(255,255,255,.92);padding:0 13px;font:600 14px -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;color:#1b1c21;outline:none}.page-name-field input:focus{border-color:rgba(22,22,28,.34);box-shadow:0 0 0 3px rgba(20,20,30,.06)}.page-name-dialog .dialog-actions{justify-content:flex-end}
@media(max-width:720px){.page-bar{top:72px;width:calc(100vw - 20px);border-radius:16px}.page-tab{height:30px;padding:0 11px;font-size:11px}.page-action-btn{width:30px;height:30px}.page-teacher-actions{gap:4px}body.publish-locked .page-bar{top:110px}}
@media(max-width:980px){.page-bar{top:122px}body.publish-locked .page-bar{top:160px}}
@media(max-width:720px){.page-bar{top:116px}body.publish-locked .page-bar{top:152px}}

/* qBoard v20.34 — link-only assignments, gradebook, synchronized presentations */
.assignment-tool,.presentation-tool{position:relative}.assignment-dialog{width:min(1180px,calc(100vw - 28px));max-height:min(900px,calc(100vh - 30px));overflow:auto;border-radius:27px;padding:20px;touch-action:auto}.assignment-create-form{margin:14px 0;padding:15px;border:1px solid rgba(24,28,40,.09);border-radius:18px;background:rgba(255,255,255,.78);display:grid;gap:11px}.assignment-create-grid{display:grid;grid-template-columns:minmax(180px,1fr) 210px 110px;gap:10px}.assignment-create-form label,.assignment-edit-form label,.assignment-link-form label,.assignment-grade-editor label{display:grid;gap:6px;color:#565963;font-size:10px;font-weight:800}.assignment-create-form input,.assignment-create-form textarea,.assignment-edit-form input,.assignment-edit-form textarea,.assignment-link-form input,.assignment-grade-editor input,.assignment-grade-editor textarea{width:100%;border:1px solid rgba(24,28,40,.12);border-radius:12px;background:#fff;color:#1f2025;padding:10px 11px;outline:none;font:600 12px/1.5 -apple-system,BlinkMacSystemFont,"SF Pro Text",sans-serif;user-select:text;-webkit-user-select:text;touch-action:auto}.assignment-create-form textarea{min-height:86px;resize:vertical}.assignment-create-actions{display:flex;align-items:center;justify-content:space-between;gap:12px}.assignment-publish-check,.assignment-grade-publish{display:flex!important;grid-auto-flow:column;grid-template-columns:auto 1fr!important;align-items:center;justify-content:flex-start!important;gap:7px!important}.assignment-publish-check input,.assignment-grade-publish input{width:16px!important;height:16px}.assignment-link-only{margin:0;padding:9px 11px;border-radius:11px;background:rgba(24,132,82,.07);color:#18774d;font-size:9px;font-weight:750;display:flex;align-items:center;gap:7px}.assignment-layout{display:grid;grid-template-columns:290px minmax(0,1fr);gap:14px;min-height:420px}.assignment-layout>aside{border:1px solid rgba(24,28,40,.08);border-radius:18px;background:rgba(248,249,251,.78);padding:11px;min-width:0}.assignment-list-head,.assignment-roster-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:1px 3px 10px}.assignment-list-head strong,.assignment-roster-head strong{font-size:11px}.assignment-list-head span,.assignment-roster-head span{font-size:9px;color:#858791}.assignment-list{display:grid;gap:7px}.assignment-list-item{appearance:none;width:100%;border:1px solid rgba(24,28,40,.08);border-radius:14px;background:rgba(255,255,255,.8);padding:11px;text-align:left;color:#282a30;display:grid;gap:5px;cursor:pointer}.assignment-list-item:hover,.assignment-list-item.active{border-color:rgba(24,28,40,.24);background:#fff;box-shadow:0 6px 16px rgba(20,23,35,.06)}.assignment-list-top{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}.assignment-list-top strong{font-size:11px;line-height:1.35;overflow-wrap:anywhere}.assignment-list-top em,.assignment-status{font-style:normal;flex:0 0 auto;border-radius:999px;padding:4px 7px;font-size:8px;font-weight:850;background:rgba(90,92,102,.08);color:#777983}.assignment-list-top em.open,.assignment-status.open{background:rgba(25,150,87,.09);color:#147c4b}.assignment-list-top em.closed,.assignment-status.closed{background:rgba(199,48,48,.08);color:#ad2f2f}.assignment-list-item small,.assignment-counts{font-size:8px;color:#8e9098}.assignment-detail{min-width:0}.assignment-detail-card{border:1px solid rgba(24,28,40,.08);border-radius:19px;background:rgba(255,255,255,.82);padding:16px;box-shadow:0 10px 28px rgba(20,23,35,.04)}.assignment-detail-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.assignment-detail-head h3{margin:8px 0 0;font-size:19px;letter-spacing:-.025em}.assignment-detail-head>strong{font-size:11px;color:#5e6069}.assignment-instructions{font-size:12px;line-height:1.65;color:#4b4d55;white-space:pre-wrap}.assignment-facts{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0}.assignment-facts>div{padding:10px 11px;border-radius:12px;background:#f7f7f9}.assignment-facts dt{font-size:8px;color:#92939a}.assignment-facts dd{margin:4px 0 0;font-size:10px;font-weight:750}.assignment-existing,.assignment-grade-result,.assignment-deadline-lock,.assignment-link-form{margin-top:12px;padding:13px;border-radius:15px;border:1px solid rgba(24,28,40,.08);background:#fafafb}.assignment-existing{display:grid;gap:5px}.assignment-existing strong{font-size:10px}.assignment-existing a{color:#1866c0;font-size:11px;overflow-wrap:anywhere}.assignment-existing small{font-size:8px;color:#8b8d95}.assignment-link-form{display:grid;gap:10px}.assignment-link-form p{margin:0;color:#19734c;font-size:9px;display:flex;align-items:center;gap:6px}.assignment-link-form .primary-btn{justify-self:end}.assignment-deadline-lock{display:flex;align-items:center;gap:8px;color:#a53131;background:rgba(206,50,50,.055);font-size:10px;font-weight:750}.assignment-grade-result{background:rgba(33,130,81,.055);border-color:rgba(33,130,81,.12)}.assignment-grade-result>div{display:flex;align-items:center;justify-content:space-between}.assignment-grade-result b{font-size:18px}.assignment-grade-result p{white-space:pre-wrap;font-size:11px;line-height:1.55}.assignment-edit-form{display:grid;grid-template-columns:minmax(170px,1fr) 205px 105px;gap:9px;margin:14px 0}.assignment-edit-instructions{grid-column:1/-1}.assignment-edit-instructions textarea{min-height:90px;resize:vertical}.assignment-edit-actions{grid-column:1/-1;display:flex;justify-content:flex-end;gap:8px}.assignment-missing-list{margin:14px 0;padding:13px;border:1px solid rgba(198,48,48,.15);border-radius:15px;background:rgba(255,246,246,.82)}.assignment-missing-list>div{display:flex;justify-content:space-between;gap:12px}.assignment-missing-list strong{color:#a92d2d;font-size:11px}.assignment-missing-list>div>span{font-size:9px;font-weight:850;color:#a92d2d}.assignment-missing-list ol{margin:10px 0 0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.assignment-missing-list li{display:flex;gap:8px;padding:8px 9px;border-radius:10px;background:#fff;font-size:9px}.assignment-missing-list li span{color:#74767e}.assignment-missing-list p{margin:10px 0 0;font-size:10px;color:#18774d}.assignment-roster{display:grid;gap:8px}.assignment-roster-row{display:grid;grid-template-columns:145px minmax(130px,.75fr) minmax(260px,1.5fr);gap:10px;align-items:center;padding:11px;border:1px solid rgba(24,28,40,.075);border-radius:14px;background:#fff}.assignment-student,.assignment-submission-cell{display:grid;gap:3px;min-width:0}.assignment-student strong{font-size:10px}.assignment-student span,.assignment-submission-cell small{font-size:8px;color:#8b8d95}.assignment-submission-cell a{display:flex;align-items:center;gap:5px;color:#1961ad;font-size:9px;font-weight:750}.assignment-missing-chip{justify-self:start;padding:4px 7px;border-radius:999px;background:rgba(198,48,48,.08);color:#aa3030;font-size:8px;font-weight:850}.assignment-grade-editor{display:grid;grid-template-columns:80px minmax(110px,1fr) auto auto;gap:7px;align-items:end}.assignment-grade-editor textarea{height:38px;min-height:38px;resize:vertical;padding:8px}.assignment-readonly-grade{font-size:11px;font-weight:850}.presentation-backdrop{background:rgba(6,7,10,.86);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px)}.presentation-dialog{width:min(1500px,calc(100vw - 24px));height:min(940px,calc(100vh - 24px));padding:15px;border-radius:25px;display:flex;flex-direction:column;gap:11px;background:rgba(24,25,30,.92);color:#fff;touch-action:auto}.presentation-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.presentation-head h2{margin:0;font-size:17px}.presentation-head p{margin:4px 0 0;font-size:9px;color:rgba(255,255,255,.55)}.presentation-head-actions{display:flex;align-items:center;gap:8px}.presentation-head .secondary-btn{border-color:rgba(255,255,255,.15);background:rgba(255,255,255,.08);color:#fff}.presentation-head .dialog-close{color:#fff}.presentation-upload-form{display:grid;grid-template-columns:minmax(160px,1fr) minmax(210px,1fr) auto;gap:9px;align-items:end;padding:10px;border-radius:14px;background:rgba(255,255,255,.07)}.presentation-upload-form label{display:grid;gap:5px;font-size:9px;color:rgba(255,255,255,.65);font-weight:750}.presentation-upload-form input[type="text"]{height:39px;border:1px solid rgba(255,255,255,.15);border-radius:11px;background:rgba(255,255,255,.08);color:#fff;padding:0 11px}.presentation-file-picker{height:39px;border:1px dashed rgba(255,255,255,.28);border-radius:11px;display:flex!important;align-items:center;justify-content:center;gap:7px;cursor:pointer}.presentation-file-picker input{position:absolute;opacity:0;pointer-events:none}.presentation-empty,.presentation-stage{flex:1;min-height:0;border-radius:17px;background:#07080a;overflow:hidden}.presentation-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:rgba(255,255,255,.65)}.presentation-empty[hidden],.presentation-stage[hidden]{display:none}.presentation-empty i{font-size:34px}.presentation-empty strong{font-size:13px}.presentation-empty span{font-size:9px}.presentation-viewer{width:100%;height:100%;display:grid;place-items:center}.presentation-viewer iframe{width:100%;height:100%;border:0;background:#111}.presentation-viewer img{width:100%;height:100%;object-fit:contain;background:#050506}.presentation-controls{display:flex;align-items:center;justify-content:center;gap:9px}.presentation-controls[hidden]{display:none}.presentation-controls label{display:flex;align-items:center;gap:6px;color:rgba(255,255,255,.65);font-size:9px}.presentation-controls input{width:66px;height:36px;border:1px solid rgba(255,255,255,.15);border-radius:10px;background:rgba(255,255,255,.09);color:#fff;text-align:center}.presentation-controls .secondary-btn{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.15);color:#fff}.presentation-dialog:fullscreen{width:100vw;height:100vh;max-width:none;max-height:none;border-radius:0}.presentation-dialog:fullscreen .presentation-head{padding-top:env(safe-area-inset-top)}
@media(max-width:860px){.assignment-dialog{padding:14px}.assignment-create-grid,.assignment-layout,.assignment-edit-form{grid-template-columns:1fr}.assignment-layout{min-height:0}.assignment-layout>aside{max-height:230px;overflow:auto}.assignment-edit-instructions,.assignment-edit-actions{grid-column:auto}.assignment-roster-row{grid-template-columns:1fr}.assignment-grade-editor{grid-template-columns:80px 1fr}.assignment-grade-editor .assignment-grade-publish,.assignment-grade-editor .secondary-btn{grid-column:auto}.presentation-dialog{height:calc(100vh - 12px);width:calc(100vw - 12px);border-radius:18px}.presentation-upload-form{grid-template-columns:1fr}.presentation-head p{display:none}.presentation-controls{flex-wrap:wrap}.presentation-controls .secondary-btn{font-size:0}.presentation-controls .secondary-btn i{font-size:13px}.assignment-missing-list ol{grid-template-columns:1fr}}

/* qBoard v20.37 — explicit move control and four-corner resizing */
#scene>.assistant-board-workspace{pointer-events:auto!important}
.management-file-drop-zone{outline:1px dashed rgba(22,75,107,.3);outline-offset:3px;border-radius:12px;flex-wrap:wrap}
.management-file-drop-zone.is-file-dragging{outline:2px dashed #164b6b;background:rgba(22,75,107,.09)!important}
.file-drop-hint{display:block;flex:0 0 100%;grid-column:1/-1;max-width:100%;font-size:10px;font-weight:500;line-height:1.5;color:#6b7280;margin-top:6px;pointer-events:none}
.assistant-side-tab{position:absolute;right:0;top:45%;transform:translateY(-50%);z-index:100;display:flex;flex-direction:column;align-items:center;gap:9px;width:44px;min-height:136px;padding:14px 8px;border:1px solid rgba(25,28,42,.12);border-right:0;border-radius:16px 0 0 16px;background:rgba(255,255,255,.95);color:#30323a;box-shadow:-6px 7px 24px rgba(20,23,34,.12);cursor:pointer;touch-action:manipulation}
.assistant-side-tab span:not(.assistant-side-tab-dot){writing-mode:vertical-rl;letter-spacing:2px;font-size:11px;font-weight:750;max-height:180px}
.assistant-side-tab:hover{background:#17181c;color:#fff}.assistant-side-tab:focus-visible{outline:3px solid #164b6b;outline-offset:-3px}.assistant-side-tab[hidden],.assistant-side-tab-dot[hidden]{display:none!important}
.assistant-side-tab-dot{position:absolute;top:7px;left:7px;width:8px;height:8px;border-radius:50%;background:#d44636;box-shadow:0 0 0 2px #fff}
body.assistant-dashboard-mode .assistant-side-tab{display:none!important}
.assistant-board-workspace{min-width:360px;min-height:360px}
.assistant-board-workspace.can-transform .assistant-board-head{cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none}
.assistant-board-workspace.is-transforming{transition:none;box-shadow:0 30px 88px rgba(20,23,34,.24),0 0 0 4px rgba(25,28,42,.055);will-change:left,top,width,height}
.assistant-board-workspace.is-transforming .assistant-board-head{cursor:grabbing}
.assistant-board-workspace.is-collapsed{height:76px!important;min-height:76px!important}
.assistant-board-head-actions{display:flex;align-items:center;gap:7px;flex:0 0 auto}
.assistant-workspace-move,.assistant-board-collapse{width:36px;height:36px;border:1px solid rgba(25,28,42,.1);border-radius:11px;background:rgba(255,255,255,.88);color:#30323a;display:grid;place-items:center;cursor:pointer;touch-action:none;flex:0 0 auto}
.assistant-workspace-move{background:#17181c;color:#fff;cursor:grab;box-shadow:0 6px 15px rgba(16,18,26,.16)}
.assistant-workspace-move:hover{background:#34363c}.assistant-workspace-move:active{cursor:grabbing}
.assistant-workspace-move[hidden]{display:none!important}
.assistant-resize-zone{position:absolute;z-index:80;background:transparent;touch-action:none;user-select:none;-webkit-user-select:none}
.assistant-resize-zone.n,.assistant-resize-zone.s{left:20px;right:20px;height:10px;cursor:ns-resize}
.assistant-resize-zone.n{top:0}.assistant-resize-zone.s{bottom:0}
.assistant-resize-zone.e,.assistant-resize-zone.w{top:20px;bottom:20px;width:10px;cursor:ew-resize}
.assistant-resize-zone.e{right:0}.assistant-resize-zone.w{left:0}
.assistant-resize-zone.nw,.assistant-resize-zone.ne,.assistant-resize-zone.sw,.assistant-resize-zone.se{width:20px;height:20px}
.assistant-resize-zone.nw{left:0;top:0;cursor:nwse-resize}.assistant-resize-zone.ne{right:0;top:0;cursor:nesw-resize}
.assistant-resize-zone.sw{left:0;bottom:0;cursor:nesw-resize}.assistant-resize-zone.se{right:0;bottom:0;cursor:nwse-resize}
.assistant-resize-zone[hidden],.assistant-board-workspace.is-collapsed .assistant-resize-zone{display:none!important}

/* qBoard v20.35 — assistant messages live directly on the whiteboard */
.assistant-workspace-tool{position:relative}.assistant-board-workspace{position:absolute;left:72px;top:92px;width:540px;height:680px;z-index:70;display:flex;flex-direction:column;overflow:hidden;border:1px solid rgba(255,255,255,.82);border-radius:27px;background:linear-gradient(145deg,rgba(255,255,255,.94),rgba(245,246,250,.88));box-shadow:0 24px 70px rgba(20,23,34,.17),inset 0 1px 0 rgba(255,255,255,.95);backdrop-filter:blur(28px) saturate(155%);-webkit-backdrop-filter:blur(28px) saturate(155%);pointer-events:auto;touch-action:auto;user-select:text;-webkit-user-select:text}.assistant-board-workspace[hidden]{display:none!important}.assistant-board-workspace.is-collapsed{height:76px}.assistant-board-head{min-height:76px;padding:14px 15px 13px 16px;display:flex;align-items:center;justify-content:space-between;gap:13px;border-bottom:1px solid rgba(25,28,42,.08);background:linear-gradient(180deg,rgba(255,255,255,.72),rgba(255,255,255,.42));flex:0 0 auto}.assistant-board-heading{display:flex;align-items:center;gap:11px;min-width:0}.assistant-board-icon{width:38px;height:38px;border-radius:13px;display:grid;place-items:center;flex:0 0 auto;background:#17181c;color:#fff;box-shadow:0 7px 18px rgba(16,18,26,.18)}.assistant-board-icon i{font-size:16px}.assistant-board-heading h2{margin:0;color:#202126;font-size:15px;letter-spacing:-.02em}.assistant-board-heading p{margin:4px 0 0;max-width:390px;color:#7b7d86;font-size:8px;line-height:1.45}.assistant-board-collapse{width:34px;height:34px;border:1px solid rgba(25,28,42,.09);border-radius:11px;background:rgba(255,255,255,.8);color:#30323a;display:grid;place-items:center;cursor:pointer;flex:0 0 auto}.assistant-board-collapse:hover{background:#17181c;color:#fff}.assistant-board-collapse i{transition:transform .18s ease}.assistant-board-workspace.is-collapsed .assistant-board-collapse i{transform:rotate(180deg)}.assistant-board-body{min-height:0;flex:1;display:flex;flex-direction:column;padding:13px}.assistant-board-body[hidden]{display:none!important}.assistant-board-workspace .assistant-post-form{flex:0 0 auto;margin:0 0 11px;padding:12px;border-radius:16px;background:rgba(255,255,255,.78)}.assistant-board-workspace .assistant-post-form textarea{min-height:82px;max-height:150px}.assistant-board-workspace .assistant-posts-list{min-height:0;flex:1;overflow:auto;padding:1px 4px 4px 1px;overscroll-behavior:contain;scrollbar-width:thin}.assistant-board-workspace .assistant-post-card{background:rgba(255,255,255,.9);box-shadow:0 7px 20px rgba(24,27,39,.045)}.assistant-board-workspace .assistant-post-author small{color:#8d8f98;font-size:8px}.assistant-board-workspace .assistant-post-files{margin-top:8px}.assistant-board-empty{min-height:190px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;text-align:center;color:#888a93}.assistant-board-empty i{font-size:25px;color:#555861}.assistant-board-empty strong{font-size:12px;color:#484a52}.assistant-board-empty span{max-width:300px;font-size:9px;line-height:1.55}.assistant-board-workspace .teacher-list-empty{padding:35px 12px}.assistant-board-workspace:focus-within{border-color:rgba(25,28,42,.18);box-shadow:0 25px 78px rgba(20,23,34,.2),0 0 0 4px rgba(25,28,42,.035)}body.assistant-no-board .assistant-board-workspace{display:flex!important}body.assistant-no-board .assistant-board-workspace[hidden]{display:none!important}

/* qBoard v20.43 — shared multi-class teaching-assistant control center */
.assistant-dashboard{position:fixed;inset:0;z-index:180;overflow:auto;padding:18px 22px 36px;background:radial-gradient(circle at 8% 0%,rgba(255,255,255,.98),rgba(241,243,247,.96) 46%,#eceef3);color:#17181c;touch-action:pan-y;user-select:text;-webkit-user-select:text}.assistant-dashboard[hidden]{display:none!important}body.assistant-dashboard-mode .topbar,body.assistant-dashboard-mode #viewport,body.assistant-dashboard-mode #toolDock,body.assistant-dashboard-mode #toolBubble{display:none!important}.assistant-dashboard-topbar{position:sticky;top:0;z-index:10;min-height:70px;padding:10px 13px 10px 14px;border-radius:22px;display:flex;align-items:center;justify-content:space-between;gap:18px}.assistant-dashboard-brand{display:flex;align-items:center;gap:11px}.assistant-dashboard-mark{width:43px;height:43px;border-radius:15px;background:#17181c;color:#fff;display:grid;place-items:center;box-shadow:0 9px 24px rgba(18,20,28,.18)}.assistant-dashboard-brand span{font-size:9px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:#777a84}.assistant-dashboard-brand h1{margin:2px 0 0;font-size:19px;letter-spacing:-.04em}.assistant-dashboard-actions{display:flex;align-items:center;gap:8px}.assistant-dashboard-actions strong{font-size:12px;margin-right:4px}.assistant-dashboard-actions button{min-height:36px;padding:0 13px;border:1px solid rgba(20,20,30,.1);border-radius:12px;background:rgba(255,255,255,.78);display:inline-flex;align-items:center;justify-content:center;gap:7px;font-size:11px;font-weight:750;cursor:pointer}.assistant-dashboard-actions button:hover{background:#17181c;color:#fff}.assistant-dashboard-intro{max-width:1500px;margin:18px auto 12px;display:flex;align-items:end;justify-content:space-between;gap:20px;padding:0 4px}.assistant-dashboard-intro div{display:flex;flex-direction:column;gap:4px}.assistant-dashboard-intro strong{font-size:15px}.assistant-dashboard-intro span{font-size:10px;color:#777a84;line-height:1.5}.assistant-dashboard-grid{max-width:1500px;margin:0 auto;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;align-items:start}.assistant-dashboard-loading,.assistant-dashboard-empty{grid-column:1/-1;min-height:260px;border:1px dashed rgba(20,20,30,.14);border-radius:24px;display:grid;place-items:center;color:#777a84;background:rgba(255,255,255,.55)}.assistant-room-card{min-width:0;border:1px solid rgba(255,255,255,.9);border-radius:25px;background:rgba(255,255,255,.78);box-shadow:0 18px 52px rgba(24,27,39,.1),inset 0 1px 0 #fff;overflow:hidden;backdrop-filter:blur(24px) saturate(145%);-webkit-backdrop-filter:blur(24px) saturate(145%)}.assistant-room-head{padding:15px 16px 13px;display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid rgba(20,20,30,.07)}.assistant-room-title{min-width:0}.assistant-room-title span{display:block;color:#747782;font-size:9px;font-weight:700}.assistant-room-title h2{margin:3px 0 0;font-size:17px;letter-spacing:-.035em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.assistant-room-badges{display:flex;align-items:center;gap:6px;flex-wrap:wrap;justify-content:flex-end}.assistant-room-badge{padding:6px 8px;border-radius:999px;background:#eceef2;color:#656872;font-size:8px;font-weight:800;white-space:nowrap}.assistant-room-badge.live{background:#dff7e9;color:#157444}.assistant-room-badge.open{background:#17181c;color:#fff}.assistant-room-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;padding:11px 14px}.assistant-room-stat{padding:10px;border-radius:14px;background:#f3f4f7;display:flex;flex-direction:column;gap:4px}.assistant-room-stat strong{font-size:15px}.assistant-room-stat span{font-size:8px;color:#797c85}.assistant-room-section{margin:0 13px 12px;border:1px solid rgba(20,20,30,.08);border-radius:17px;background:rgba(255,255,255,.76);overflow:hidden}.assistant-room-section>summary{list-style:none;min-height:43px;padding:0 12px;display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:11px;font-weight:800;cursor:pointer}.assistant-room-section>summary::-webkit-details-marker{display:none}.assistant-room-section>summary::after{content:'＋';font-size:15px;font-weight:500}.assistant-room-section[open]>summary::after{content:'−'}.assistant-room-section-body{padding:0 10px 11px}.assistant-dashboard-attendance{width:100%;border-collapse:separate;border-spacing:0;font-size:9px}.assistant-dashboard-attendance th,.assistant-dashboard-attendance td{padding:7px 5px;border-top:1px solid rgba(20,20,30,.06);text-align:center}.assistant-dashboard-attendance th:nth-child(1),.assistant-dashboard-attendance td:nth-child(1),.assistant-dashboard-attendance th:nth-child(2),.assistant-dashboard-attendance td:nth-child(2){text-align:left}.assistant-dashboard-attendance input{width:17px;height:17px;accent-color:#157b49;cursor:pointer}.assistant-dashboard-none{padding:20px 10px;text-align:center;color:#858892;font-size:10px}.assistant-dashboard-message-list{display:flex;flex-direction:column;gap:7px;max-height:260px;overflow:auto}.assistant-dashboard-message{padding:9px 10px;border-radius:13px;background:#f2f3f6}.assistant-dashboard-message.teacher{background:#eaf3ff}.assistant-dashboard-message-head{display:flex;justify-content:space-between;gap:10px;font-size:8px;color:#777a84}.assistant-dashboard-message p{margin:5px 0 0;font-size:10px;line-height:1.55;white-space:pre-wrap;word-break:break-word}.assistant-dashboard-message-files{display:flex;gap:5px;flex-wrap:wrap;margin-top:6px}.assistant-dashboard-message-files a{padding:5px 7px;border-radius:8px;background:#fff;color:#353740;font-size:8px;text-decoration:none}.assistant-dashboard-message-form{display:grid;grid-template-columns:1fr auto;gap:7px;margin-top:9px}.assistant-dashboard-message-form textarea{min-height:58px;resize:vertical;border:1px solid rgba(20,20,30,.1);border-radius:12px;padding:9px;font:inherit;font-size:10px}.assistant-dashboard-message-form .assistant-dashboard-send{align-self:stretch;padding:0 13px;border-radius:12px;background:#17181c;color:#fff;font-size:10px;font-weight:800;cursor:pointer}.assistant-dashboard-file-row{grid-column:1/-1;display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:8px;color:#777a84}.assistant-dashboard-file-row input{max-width:70%;font-size:8px}.assistant-fixed-access{display:flex!important;flex-direction:column;align-items:flex-start!important;gap:8px!important}.assistant-fixed-access span{display:flex!important;align-items:center;gap:7px!important}.assistant-fixed-access i{color:#157b49}.assistant-fixed-access span:last-child i{color:#626570}@media(max-width:980px){.assistant-dashboard-grid{grid-template-columns:1fr}.assistant-dashboard{padding:12px 12px 28px}.assistant-dashboard-topbar{position:relative;align-items:flex-start}.assistant-dashboard-actions{flex-wrap:wrap;justify-content:flex-end}.assistant-dashboard-actions strong{width:100%;text-align:right}.assistant-dashboard-intro{align-items:flex-start;flex-direction:column;gap:7px}}@media(max-width:560px){.assistant-dashboard-topbar{flex-direction:column;align-items:stretch}.assistant-dashboard-actions{justify-content:stretch}.assistant-dashboard-actions strong{text-align:left}.assistant-dashboard-actions button{flex:1}.assistant-room-summary{grid-template-columns:1fr}.assistant-dashboard-message-form{grid-template-columns:1fr}.assistant-dashboard-message-form .assistant-dashboard-send{min-height:40px}}