/* Teacher workspace · 2026-09-22. Shared desktop/mobile UI; no business state. */
:root{
  --bg:#f6f7fa;--app-bg:#f6f7fa;--panel:#fff;--sidebar-bg:#f8f9fc;
  --text:#202735;--ink:#202735;--ink-2:#495366;--ink-3:#697487;--muted:#697487;--weak:#697487;
  --line:#e2e6ed;--line-soft:#e2e6ed;--teal:#3458cd;--teal-dark:#2949af;--teal-soft:#edf1ff;
  --accent:#3458cd;--accent-ink:#2949af;--accent-wash:#edf1ff;--hover:#edf0f6;--ring:rgba(52,88,205,.2);
  --blue:#3458cd;--orange:#995b0a;--red:#b83740;--radius:12px;--r-lg:16px;--r-md:10px;--r-sm:7px;
  --shadow:0 2px 7px rgba(22,34,55,.03);--shadow-float:0 12px 40px rgba(22,34,55,.12);
  --workbench-vh:100dvh;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{font-family:"Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei UI","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--text)}
button,input,textarea,select{font:inherit}
button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}
.btn{min-height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink-2);padding:8px 14px;box-shadow:none;font-size:13px;font-weight:550;transition:background .15s,border-color .15s}
.btn:hover{background:var(--hover);border-color:#bac4d5;transform:none}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:none}
.btn.primary:hover{background:var(--accent-ink);border-color:var(--accent-ink)}
.btn.small{min-height:32px;font-size:12px}.text-btn{color:var(--accent-ink);background:transparent}
.icon-button{display:inline-grid;place-items:center;width:38px;height:38px;min-width:38px;border:1px solid transparent;border-radius:9px;background:transparent;color:var(--ink-2)}
.icon-button:hover{background:var(--hover)}
.card{border:1px solid var(--line);border-radius:12px;background:#fff;box-shadow:none}
.page-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}
.page-header h2{font-size:25px;letter-spacing:-.5px;color:var(--ink);margin:0}
.page-header p,.page-description{margin:7px 0 0;color:var(--muted);font-size:13px;line-height:1.7}
.page-header .toolbar-actions{display:flex;flex-wrap:wrap;gap:8px}
.page-tabs,.grade-tabs{border-bottom:1px solid var(--line);background:transparent;padding:0;gap:22px;box-shadow:none;border-radius:0;display:flex;overflow-x:auto;max-width:100%}
.page-tab,.grade-tab{background:transparent;border:0;border-bottom:2px solid transparent;border-radius:0;padding:12px 2px;color:var(--muted);white-space:nowrap;font-size:14px}
.page-tab.active,.grade-tab.active{color:var(--accent-ink);background:transparent;border-bottom-color:var(--accent);box-shadow:none;font-weight:650}
.toolbar{border:1px solid var(--line);box-shadow:none;background:#fff;border-radius:10px}
input:not([type=checkbox]):not([type=radio]):not([type=file]),select,textarea{border-color:#cbd2df;color:var(--text);background:#fff;border-radius:8px}
input::placeholder,textarea::placeholder{color:#778296;opacity:1}
.data-table th,.duty-table th{background:#f6f8fc;color:#525e72;font-weight:600}
.data-table td,.data-table th{border-color:var(--line)}
.table-wrap,.table-scroll{overflow:auto;max-width:100%;overscroll-behavior-x:contain}
.data-table tr:hover td{background:#f7f9fd}
.status-chip{background:#f0f3f8;color:#526077}.status-chip.failed{background:#fff0f0;color:#a32d35}
.status-chip.active{background:#edf6f1;color:#22634b}
.modal{border:1px solid var(--line);box-shadow:var(--shadow-float);border-radius:14px}
.modal-head{border-bottom-color:var(--line);padding:20px 24px}.modal-head h2{font-size:19px}
.modal-body{padding:24px}.modal-backdrop{background:rgba(22,30,46,.32);backdrop-filter:none}
.sidebar{background:var(--sidebar-bg);border-right:1px solid var(--line);box-shadow:none}
.brand{border-bottom:0;gap:10px;min-height:68px}
.brand-mark{background:var(--accent);color:#fff;border-radius:10px;box-shadow:none;width:36px;height:36px}
.brand strong{font-size:15px;letter-spacing:0;color:var(--ink)}.brand-copy span{font-size:11px;color:var(--muted)}
.sidebar-collapse-btn{background:transparent;border:0;color:var(--muted)}
.nav-list{padding-top:7px;flex:none;overflow:visible}
.nav-group{margin-bottom:12px}.nav-group-items{padding-left:0;gap:4px}
.nav-item{min-height:42px;border-radius:8px;gap:11px;font-size:13px;color:var(--ink-2);padding:10px 12px;box-shadow:none;background:transparent}
.nav-item:hover{background:var(--hover);color:var(--ink)}
.nav-item.active{background:var(--accent-wash);color:var(--accent-ink);font-weight:650;box-shadow:none}
.nav-item.active:before{display:none}
.nav-group-toggle{color:var(--muted);font-size:11px;font-weight:600;padding:8px 12px;border:0;background:transparent;letter-spacing:.04em}
.nav-group-icon{display:none}.nav-group-title{flex:1;text-align:left}
.nav-group[data-nav-group=system]{margin-top:14px;border-top:1px solid var(--line);padding-top:10px}
.sidebar>.brand,.sidebar>.sidebar-footer{flex-shrink:0}
.sidebar:not(.collapsed)>.nav-list{flex:0 1 auto;min-height:100px;max-height:60%;overflow-y:auto;overflow-x:hidden;scrollbar-width:thin}
.sidebar-threads{display:flex;flex:1 1 180px;flex-direction:column;gap:3px;min-height:150px;overflow:hidden;padding:12px 0 0;margin:0;border-top:1px solid var(--line)}
.sidebar-threads>.assistant-new-thread,.sidebar-threads>.nav-group-label{flex-shrink:0}
.sidebar-thread-list{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;overscroll-behavior-y:contain;scrollbar-width:thin;scrollbar-color:#aebbd2 transparent;display:flex;flex-direction:column;gap:3px}
.sidebar-thread-list>.nav-thread{flex-shrink:0}
.sidebar-threads .assistant-new-thread{order:-1;margin:0 0 12px;background:#fff;border:1px solid #ced7e8;box-shadow:0 1px 2px #17264006;color:var(--ink-2);text-align:left;padding:10px 12px;font-size:13px;border-radius:8px;min-height:38px}
.sidebar-threads .nav-group-label{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted);padding:6px 10px;margin:0;letter-spacing:0}
.sidebar-threads .nav-group-label button{font-size:11px}
.nav-thread{border:0;background:transparent;border-radius:7px;color:var(--ink-2);padding:9px 10px;width:100%;min-width:0;display:flex;justify-content:space-between;gap:8px;text-align:left;font-size:12px}
.nav-thread span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nav-thread small{color:var(--muted);font-size:10px;flex:none}
.nav-thread:hover,.nav-thread.active{background:var(--hover);color:var(--accent-ink)}
.sidebar-footer{margin-top:auto;border-top:1px solid var(--line);padding:12px 10px 0;color:var(--muted);font-size:11px}
.sidebar.collapsed .sidebar-threads{display:none}
.desktop-topbar{height:68px;min-height:68px;padding:0 30px;gap:20px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.94);box-shadow:none}
.page-context{display:flex;align-items:center;gap:14px;min-width:0;flex:1}
.page-context strong{font-size:15px;font-weight:650;white-space:nowrap}.page-context span{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.top-summary{margin-left:0}.top-summary-button{border:0;background:transparent}.top-summary-button strong{font-size:12px}.top-summary-button span{display:none}
.top-actions{gap:9px;border:0;padding:0}.save-status{font-size:11px;color:var(--muted)}
.top-data-btn{font-size:12px;padding:6px 10px;background:transparent}
.reminder-trigger{position:relative}.notification-count{position:absolute;top:1px;right:0;min-width:17px;height:17px;padding:0 4px;border-radius:9px;background:var(--accent);color:white;font-size:10px;font-weight:700;line-height:17px}
.workspace-body{display:grid;grid-template-columns:minmax(0,1fr);min-width:0;flex:1;position:relative}
.page-root{width:100%;max-width:1560px;min-width:0;margin:0 auto;padding:30px 36px 48px}
body[data-page=ai-assistant] .page-root{padding:0;max-width:none;background:#fff;height:calc(var(--workbench-vh) - 68px);min-height:0;overflow:hidden}
body[data-page=ai-assistant] .top-summary{display:none}
.assistant-workspace.assistant-shell{width:100%;max-width:none;height:100%;min-height:0;padding:0;margin:0;display:block;position:relative;background:#fff;gap:0}
.assistant-main{width:100%;height:100%;min-width:0;display:flex;flex-direction:column;padding:0 clamp(24px,4vw,64px)}
.conversation-toolbar{min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-shrink:0;border-bottom:1px solid #f0f2f6;font-size:12px}
.conversation-toolbar>div{display:flex;align-items:center;gap:8px;min-width:0}.conversation-toolbar strong{font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--muted);max-width:440px}
.conversation-status{width:6px;height:6px;border-radius:50%;background:#5c769f;flex:none}
.conversation-tools{gap:12px!important}.conversation-tools .text-btn{display:flex;align-items:center;gap:5px;font-size:11px;white-space:nowrap;color:var(--muted);padding:6px}
.assistant-shell .assistant-conversation{flex:1;min-height:0;overflow:auto;padding:24px 8px;gap:25px;justify-content:flex-start;scrollbar-width:thin;width:100%;max-width:860px;margin:0 auto}
.assistant-shell.is-empty .assistant-conversation{display:flex;justify-content:center;padding-top:20px;padding-bottom:16px}
.assistant-shell .assistant-welcome{margin:auto 0;padding:10px 0;text-align:center;width:100%}
.welcome-mark{display:inline-grid;place-items:center;width:52px;height:52px;background:var(--accent-wash);color:var(--accent);border-radius:15px;margin-bottom:20px}
.assistant-welcome .welcome-kicker{font-size:13px;margin:0 0 8px;color:var(--muted)}
.assistant-welcome h1{font-size:clamp(26px,2.5vw,36px);line-height:1.4;letter-spacing:-1px;font-weight:650;margin:0 0 12px;color:var(--ink)}
.assistant-shell .assistant-welcome>p:not(.welcome-kicker){font-size:14px;margin:0;color:var(--muted);line-height:1.8}
.assistant-starters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;max-width:720px;margin:30px auto 0;text-align:left}
.starter-action{position:relative;display:grid;grid-template-columns:28px minmax(0,1fr);column-gap:9px;row-gap:5px;padding:16px 14px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);transition:background .15s,border-color .15s;min-width:0;text-align:left;box-shadow:none}
.starter-action>span{grid-row:1/3;color:#61708a;display:flex;align-items:flex-start;padding-top:2px}.starter-action strong{font-size:13px;font-weight:600}.starter-action small{font-size:11px;color:var(--muted);line-height:1.6}
.starter-action:hover{background:#f8faff;border-color:#aebfe9}.starter-action:hover>span{color:var(--accent)}
.composer-area{width:100%;max-width:860px;margin:0 auto;flex-shrink:0;position:relative;padding:6px 0 16px}
.assistant-shell .assistant-composer{padding:14px 16px 10px;background:#fff;border:1px solid #cdd6e6;border-radius:14px;box-shadow:0 4px 18px rgba(33,52,91,.055);margin:0;position:relative;bottom:auto}
.assistant-shell .assistant-composer:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px #3458cd0a}
.assistant-composer textarea#assistant-input{width:100%;padding:0;min-height:56px;max-height:180px;resize:vertical;border:0;background:transparent;outline:none;border-radius:0;font-size:15px;line-height:1.8;color:var(--ink);box-shadow:none}
.assistant-compose-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:7px}
.composer-tools{display:flex;align-items:center;gap:8px}
.composer-attach,.composer-skill-button{position:relative;display:inline-flex;align-items:center;gap:6px;min-height:34px;border:0;border-radius:7px;background:transparent;color:var(--ink-2);padding:6px 8px;font-size:12px;font-weight:500;cursor:pointer}
.composer-attach:hover,.composer-skill-button:hover{background:var(--hover)}.composer-attach input{position:absolute;width:1px;height:1px;opacity:0}.composer-attach:focus-within{outline:2px solid var(--accent);outline-offset:2px}
.send-button{display:grid;place-items:center;width:36px;height:36px;border:0;border-radius:9px;background:var(--accent);color:white;flex:none}
.send-button:hover{background:var(--accent-ink)}.send-button:disabled{background:#8394c5}
.composer-footnote{display:flex;justify-content:space-between;gap:10px;font-size:10px;line-height:1.5;color:var(--muted);margin:10px 4px 0}
.assistant-selected-files{margin:0}.assistant-selected-files:not(:empty){padding-bottom:12px}
.assistant-selected-files>span{background:#f4f6fb;border:1px solid var(--line);color:var(--ink-2)}
.assistant-progress:empty{display:none}.assistant-progress{padding:10px 0 2px;font-size:12px;color:var(--muted);line-height:1.6}
.assistant-skills-panel{position:absolute;bottom:100%;left:0;right:0;z-index:35;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;padding:10px;max-height:min(440px,52vh);overflow:auto;background:white;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-float);margin-bottom:8px}
.assistant-skill-item{display:flex;text-align:left;align-items:flex-start;gap:10px;border:0;border-radius:8px;background:white;padding:12px;color:var(--ink)}.assistant-skill-item:hover{background:var(--hover)}.assistant-skill-copy{display:grid;gap:4px}.assistant-skill-copy strong{font-size:13px}.assistant-skill-copy small{font-size:11px;line-height:1.6;color:var(--muted)}
.assistant-message{max-width:100%;width:auto}.assistant-message.from-teacher{align-self:flex-end;width:fit-content;max-width:85%;border:0;background:#edf1fa;border-radius:14px 14px 4px 14px;padding:14px 18px;box-shadow:none}
.assistant-message.from-assistant{align-self:flex-start;width:100%;background:transparent;padding:0;border:0;box-shadow:none}
.assistant-message-label{font-size:11px;color:var(--muted);font-weight:550;margin-bottom:8px}.assistant-message-label time{font-size:10px;color:var(--muted)}
.assistant-message-text{font-size:14px;line-height:1.9;overflow-wrap:anywhere;color:var(--ink)}
.assistant-files{gap:6px}.assistant-file{min-width:0;max-width:100%;border-color:#d6deed;border-radius:8px;background:#fff;padding:10px 12px}.assistant-file strong{overflow-wrap:anywhere}
.assistant-alert{background:#fff8e9;color:#875718;border:1px solid #ead9b5;border-radius:8px}
.assistant-sources{border-top:1px solid var(--line);padding-top:10px}.assistant-sources summary{color:var(--muted);font-size:12px}.assistant-proposal{gap:10px}.assistant-proposal-actions{flex-wrap:wrap}
.assistant-threads{display:none!important}.assistant-threads.history-open{display:flex!important;position:absolute;inset:8px auto 8px 8px;z-index:45;width:min(360px,calc(100% - 16px));padding:18px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-float);flex-direction:column}
.history-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.history-heading h2{font-size:18px;margin:0}.history-search{width:100%;padding:9px 11px;font-size:13px;margin:10px 0}.assistant-thread-list{overflow:auto;flex:1;min-height:0}.assistant-threads .assistant-new-thread{padding:10px;border:1px solid var(--line);background:var(--accent-wash);color:var(--accent-ink);border-radius:8px;margin-bottom:10px}
.nav-thread-row{display:flex;min-width:0}.nav-thread-row .nav-thread{flex:1;min-width:0}.nav-thread-actions{display:flex}.nav-thread-act{border:0;background:none;color:var(--muted);padding:5px;min-width:26px}.nav-thread-act:hover{color:var(--accent)}
.assistant-thread-foot{font-size:11px;border-top:1px solid var(--line);margin-top:10px}.assistant-thread-foot button{font-size:11px}
.result-card{max-width:560px;border:1px solid var(--line);border-radius:11px;margin-top:16px;background:#fff;box-shadow:0 2px 5px #1a2a4405;overflow:hidden}
.result-card-open{display:flex;align-items:center;gap:13px;padding:15px;width:100%;border:0;background:#fff;color:var(--ink);text-align:left}.result-card-open:hover{background:#f7f9ff}
.result-card-open>span:nth-child(2){display:grid;gap:6px;flex:1;min-width:0}.result-card-open strong{font-size:14px;overflow-wrap:anywhere}.result-card-open small{font-size:11px;color:var(--muted)}
.result-file-icon{display:grid;place-items:center;width:42px;height:46px;background:var(--accent-wash);color:var(--accent-ink);border-radius:7px;flex:none}
.workspace-body.has-preview{grid-template-columns:minmax(300px,.9fr) minmax(400px,1.3fr)}
.workspace-body.has-preview .assistant-main{padding-inline:22px}.workspace-body.has-preview .assistant-starters{grid-template-columns:repeat(2,minmax(0,1fr))}.workspace-body.has-preview .conversation-toolbar strong{max-width:190px}
.workspace-preview{background:#fafbfe;border-left:1px solid var(--line);min-width:0;height:calc(var(--workbench-vh) - 68px);position:sticky;top:68px;display:flex;flex-direction:column;z-index:36}
.workspace-preview-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:22px 24px;background:#fff;border-bottom:1px solid var(--line);flex:none}
.workspace-preview-head h2{font-size:19px;line-height:1.5;margin:5px 0 0;font-weight:650;overflow-wrap:anywhere}.workspace-preview-head p{font-size:12px;color:var(--muted);margin:5px 0 0;line-height:1.6}
.eyebrow{font-size:11px;letter-spacing:.04em;color:var(--muted)}
.workspace-preview-content{overflow:auto;min-height:0;padding:24px;flex:1;scrollbar-width:thin;overscroll-behavior:contain}
.workspace-preview-content>.assistant-artifact,.workspace-preview-content>.assistant-deck-card,.workspace-preview-content>.assistant-seat-draft,.workspace-preview-content>.assistant-teaching-artifacts{border:0;background:transparent;margin:0;padding:0}
.workspace-preview-content .assistant-artifact textarea{background:#fff;min-height:300px;font-size:15px;line-height:1.9;border-color:#cbd2df}
.workspace-preview-content table{border-collapse:collapse;width:100%;font-size:13px;background:#fff}
.workspace-preview-content th,.workspace-preview-content td{border:1px solid var(--line);padding:10px;text-align:left;vertical-align:top}.workspace-preview-content th{background:#f0f3f9}
.slide-content{background:#fff;border:1px solid var(--line);padding:24px;border-radius:9px;margin:14px 0}.slide-content small{font-size:11px;color:var(--muted)}.slide-content h3{font-size:20px;margin:12px 0}.slide-content p,.slide-content li{font-size:14px;line-height:1.9}.slide-content.cover{padding-block:46px}.slide-content.closing{text-align:center}
.preview-note{color:var(--muted);font-size:12px;line-height:1.7;margin:14px 0}.preview-file-actions{position:sticky;top:0;padding-bottom:15px;background:#fafbfe;z-index:1}
.document-content{background:#fff;border:1px solid var(--line);border-radius:7px;padding:28px;font-size:15px;line-height:1.9}.document-content p{margin:0 0 10px}.source-content{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;line-height:1.8}.file-image-preview{display:block;max-width:100%;height:auto}.file-pdf-preview{width:100%;height:calc(var(--workbench-vh) - 230px);border:1px solid var(--line);background:#fff}
.workspace-empty{padding:48px 24px;text-align:center;color:var(--muted)}.workspace-empty>svg{color:#8291aa;margin-bottom:10px}.workspace-empty h3{font-size:17px;color:var(--ink);margin:12px 0}.workspace-empty p{font-size:13px;line-height:1.8;margin:0 0 20px}
.reminder-list{display:grid;gap:12px}.reminder-item{display:flex;gap:12px;padding:17px;background:#fff;border:1px solid var(--line);border-radius:10px}.reminder-item>div{display:grid;gap:8px;flex:1;min-width:0}.reminder-item strong{font-size:14px;line-height:1.7}.reminder-item p{margin:0;font-size:13px;line-height:1.7}.reminder-item small{color:var(--muted);font-size:11px}.reminder-symbol{color:var(--accent);padding-top:3px}.reminder-symbol.overdue{color:var(--orange)}.row-actions{display:flex;gap:8px;flex-wrap:wrap}.reminder-item .text-btn{justify-self:start;font-size:12px;padding:4px 0}
.teaching-page{max-width:1200px;margin:0 auto}.teaching-page .page-tabs{margin-bottom:22px}.teaching-top-actions{display:flex;gap:8px;flex-wrap:wrap}
.teaching-course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}.course-tile{border:1px solid var(--line);border-radius:12px;background:#fff;padding:24px;display:flex;flex-direction:column;gap:14px}.course-tile .course-icon{color:var(--accent);width:40px;height:40px;display:grid;place-items:center;background:var(--accent-wash);border-radius:10px}.course-tile h3{font-size:18px;margin:0}.course-tile p{font-size:12px;color:var(--muted);margin:0;line-height:1.8}.course-tile .btn{align-self:flex-start;margin-top:8px}
.teaching-resource-list{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}.teaching-resource-row{display:flex;align-items:center;gap:14px;padding:18px 20px;border-bottom:1px solid var(--line)}.teaching-resource-row:last-child{border-bottom:0}.teaching-resource-copy{display:grid;gap:7px;min-width:0;flex:1}.teaching-resource-copy strong{font-size:14px;overflow-wrap:anywhere}.teaching-resource-copy small{font-size:11px;color:var(--muted)}.teaching-resource-actions{display:flex;gap:8px;flex:none}.resource-filter{width:min(100%,340px);padding:10px 12px;margin-bottom:18px;font-size:13px}
.materials-page{max-width:1200px;margin:auto}.material-overview{display:none}.materials-toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin:20px 0}.materials-toolbar input{width:min(100%,340px);padding:10px 12px;font-size:13px}.materials-total{font-size:12px;color:var(--muted)}
.materials-inbox-list{border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden}.material-row{border:0;border-bottom:1px solid var(--line);border-radius:0;box-shadow:none;margin:0;padding:20px;gap:15px;background:#fff}.material-row:last-child{border-bottom:0}.material-source{background:var(--accent-wash);color:var(--accent-ink);border:0;border-radius:9px;font-size:12px;width:42px;height:46px;flex:none;display:grid;place-items:center}.material-row-title strong{font-size:14px}.material-row-main>p{font-size:12px;color:var(--muted);line-height:1.7}.material-meta{font-size:11px;gap:14px}.material-row-actions{align-self:center}.materials-empty{padding:55px 24px}.materials-empty p{font-size:13px;color:var(--muted);line-height:1.8}
.student-profile,.student-hub,.grade-page,.grades-page{color:var(--text)}.profile-avatar{background:var(--accent-wash);color:var(--accent)}
.button-spinner{width:16px;height:16px;border:2px solid #ffffff60;border-top-color:white;border-radius:50%;animation:workspace-spin .8s linear infinite}
@keyframes workspace-spin{to{transform:rotate(360deg)}}
@media(min-width:1024px){
  .sidebar{width:236px;padding:16px 14px;display:flex;flex-direction:column;overflow-y:auto;overflow-x:hidden;height:100dvh;position:fixed;top:0;left:0;z-index:45}
  .main-area{margin-left:236px;width:calc(100% - 236px);min-width:0;display:flex;flex-direction:column;min-height:100dvh}
  .sidebar.collapsed{width:72px;padding:14px 9px}.sidebar.collapsed~.main-area{margin-left:72px;width:calc(100% - 72px)}
  .sidebar.collapsed .nav-group[data-nav-group=workspace] .nav-group-items,.sidebar.collapsed .nav-group[data-nav-group=system] .nav-group-items{display:grid;padding:0}
  .sidebar.collapsed .nav-group[data-nav-group=workspace] .nav-item,.sidebar.collapsed .nav-group[data-nav-group=system] .nav-item{width:50px;justify-content:center;padding:10px}
  .sidebar.collapsed .nav-group-title{display:none}.sidebar.collapsed .nav-group-icon{display:flex}.sidebar.collapsed .nav-group[data-nav-group=system]{margin-top:8px}
  .desktop-topbar .menu-toggle{display:none}
}
@media(min-width:768px) and (max-width:1023px){
  .sidebar{width:224px;z-index:80;padding:16px 14px}.main-area{margin-left:0;width:100%;display:flex;flex-direction:column;min-height:100dvh}
  .desktop-topbar{padding-inline:20px}.desktop-topbar .menu-toggle{display:inline-grid}.top-summary{display:none}.page-root{padding:24px}
}
@media(max-width:1099px){
  .workspace-body.has-preview{grid-template-columns:minmax(0,1fr)}
  .workspace-preview{position:fixed;inset:0;height:var(--workbench-vh);z-index:100;border:0;background:#fafbfe}
  .workspace-preview-head{padding:18px 20px}.workspace-preview-content{padding:20px}.preview-open{overflow:hidden}
}
@media(max-width:767px){
  :root{--mobile-bottom-h:62px}
  body{background:#f6f7fa}.main-area{margin-left:0;width:100%;min-height:100dvh;padding:0 0 calc(62px + env(safe-area-inset-bottom));display:block}
  .desktop-topbar{display:none!important}.mobile-topbar{height:56px;display:grid;grid-template-columns:44px minmax(0,1fr) 44px;padding:0 8px;gap:8px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
  .mobile-class-label{display:none}.mobile-page-title{text-align:center;font-size:15px;font-weight:650;grid-column:2;grid-row:1}.mobile-topbar .reminder-trigger{grid-column:3;grid-row:1}.mobile-icon-button{width:44px;height:44px;display:grid;place-items:center;background:transparent;color:var(--ink-2);border:0;border-radius:9px}
  .sidebar{position:fixed;inset:0 auto 0 0;width:min(310px,85vw);padding:16px 14px 24px;z-index:90;overflow:auto;transform:translateX(-105%);display:flex;flex-direction:column;height:100dvh}.sidebar.open{transform:translateX(0)}.sidebar-scrim{z-index:85;background:rgba(21,31,48,.3)}
  .sidebar .brand-copy{display:block}.sidebar .brand{justify-content:flex-start}.sidebar .nav-label{display:block}.sidebar .nav-item{min-height:44px}.sidebar .sidebar-threads{display:flex}.sidebar .sidebar-footer{padding-top:16px}
  .mobile-bottom-nav{position:fixed;left:0;right:0;bottom:0;height:calc(62px + env(safe-area-inset-bottom));padding:5px 8px calc(5px + env(safe-area-inset-bottom));display:grid;grid-template-columns:repeat(4,minmax(0,1fr));background:#fff;border-top:1px solid var(--line);z-index:45;box-shadow:none}
  .mobile-bottom-item,.mobile-bottom-item.record.assistant{height:50px;min-height:50px;background:transparent;border:0;color:var(--muted);padding:3px;gap:3px;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:10px;font-weight:550;transform:none;box-shadow:none;border-radius:0}
  .mobile-bottom-icon,.mobile-bottom-item.record .mobile-bottom-icon{height:28px;min-height:28px;width:52px;border-radius:10px;background:transparent;display:grid;place-items:center;box-shadow:none;color:inherit;margin:0;transform:none}
  .mobile-bottom-item.active{color:var(--accent-ink)}.mobile-bottom-item.active .mobile-bottom-icon{background:var(--accent-wash)}
  .page-root{padding:22px 16px 32px;width:100%;max-width:none}.page-header{margin-bottom:20px;align-items:flex-start}.page-header h2{font-size:23px}.page-header .toolbar-actions{justify-content:flex-end;gap:6px}.page-header .btn{font-size:12px;padding:8px 10px;min-height:38px}
  body[data-page=ai-assistant] .page-root{height:calc(var(--workbench-vh) - 118px - env(safe-area-inset-bottom));padding:0;position:relative;overflow:hidden}
  .assistant-workspace.assistant-shell{position:relative;inset:auto;height:100%;min-height:0;max-width:none;padding:0;z-index:auto;background:#fff}
  .assistant-main{padding:0 16px}.conversation-toolbar{min-height:42px;gap:8px;border-bottom:0}.conversation-toolbar strong{font-size:10px;max-width:155px}.conversation-tools{gap:3px!important}.conversation-tools .text-btn{min-height:34px;font-size:10px;padding:5px}.conversation-tools .text-btn>svg{width:14px;height:14px}
  .assistant-shell .assistant-conversation{padding:12px 0;gap:20px}.assistant-shell.is-empty .assistant-conversation{padding:12px 0;justify-content:center}
  .assistant-shell .assistant-welcome{padding:0}.welcome-mark{width:42px;height:42px;border-radius:12px;margin-bottom:14px}.welcome-mark>svg{width:23px;height:23px}.assistant-welcome h1{font-size:25px;letter-spacing:-.7px;margin-bottom:8px}.assistant-welcome .welcome-kicker{font-size:11px;margin-bottom:6px}.assistant-shell .assistant-welcome>p:not(.welcome-kicker){font-size:12px;line-height:1.8}
  .assistant-starters{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:23px}.starter-action{padding:12px 10px;grid-template-columns:23px minmax(0,1fr);column-gap:6px;row-gap:3px;border-radius:9px}.starter-action strong{font-size:12px}.starter-action small{font-size:10px;line-height:1.5}.starter-action>span svg{width:17px;height:17px}
  .composer-area{padding:6px 0 7px}.assistant-shell .assistant-composer{padding:11px 12px 8px;border-radius:12px}.assistant-composer textarea#assistant-input{font-size:16px;min-height:44px;max-height:120px;line-height:1.6}.assistant-compose-actions{margin-top:3px}.composer-attach,.composer-skill-button{font-size:11px;min-height:36px;padding:6px 5px}.composer-tools{gap:6px}.send-button{width:36px;height:36px}.composer-footnote{font-size:9px;margin:7px 2px 0;justify-content:center}.desktop-shortcut{display:none}
  .assistant-skills-panel{grid-template-columns:1fr;max-height:45dvh}.assistant-skill-item{padding:10px}.assistant-message-text{font-size:14px;line-height:1.9}.assistant-message.from-teacher{max-width:94%;padding:11px 14px}.result-card{max-width:100%}.result-card-open{padding:12px;gap:10px}.result-card-open strong{font-size:13px}.result-card-open small{font-size:10px}
  .assistant-threads.history-open{position:fixed;inset:56px 0 calc(62px + env(safe-area-inset-bottom));width:100%;border:0;border-radius:0;z-index:60;box-shadow:none;padding:18px 20px}.assistant-thread-list .nav-thread{padding:13px 8px;font-size:13px}.nav-thread-actions{align-items:center}.nav-thread-act{min-height:40px;min-width:34px}
  .workspace-preview{height:var(--workbench-vh);padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}.workspace-preview-head{padding:16px}.workspace-preview-head h2{font-size:18px}.workspace-preview-content{padding:16px}.workspace-preview-content .assistant-artifact textarea{min-height:45vh;font-size:16px}.slide-content{padding:20px}.slide-content h3{font-size:19px}.document-content{padding:18px}
  .teaching-course-grid{grid-template-columns:1fr}.course-tile{padding:20px;gap:12px}.teaching-top-actions{gap:6px}.teaching-resource-row{padding:15px 14px;gap:10px;flex-wrap:wrap}.teaching-resource-actions{margin-left:52px;flex-wrap:wrap}.teaching-resource-copy{flex:1;min-width:140px}.teaching-resource-copy strong{font-size:13px}.teaching-resource-copy small{line-height:1.7}.resource-filter{width:100%;font-size:16px}
  .materials-toolbar input{width:100%;font-size:16px}.materials-toolbar{gap:8px}.material-row{padding:16px 13px;gap:10px;flex-wrap:wrap}.material-row-main{min-width:0;flex:1}.material-row-actions{margin-left:52px}.material-row-title{align-items:flex-start;flex-wrap:wrap;gap:6px}.material-row-title strong{font-size:13px}.material-meta{font-size:10px;gap:8px}.material-source{width:36px;height:40px}.material-row-main>p{font-size:12px}.page-tabs,.grade-tabs{gap:20px}.page-tab,.grade-tab{font-size:13px;min-height:44px}
  .modal{max-height:calc(var(--workbench-vh) - 24px);border-radius:12px}.modal-body{padding:18px}.modal-head{padding:16px 18px}.modal-body .field input,.modal-body .field textarea,.modal-body .field select{font-size:16px}
  .keyboard-open .mobile-bottom-nav{display:none}.keyboard-open[data-page=ai-assistant] .page-root{height:calc(var(--workbench-vh) - 56px)}.keyboard-open .main-area{padding-bottom:0}.keyboard-open .assistant-welcome{padding-top:12px}.keyboard-open .assistant-starters{display:none}
}
@media(max-height:720px) and (min-width:768px){.welcome-mark{margin-bottom:12px;width:42px;height:42px}.assistant-starters{margin-top:20px}.starter-action{padding:12px}.assistant-welcome h1{font-size:28px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media print{.sidebar,.topbar,.mobile-topbar,.mobile-bottom-nav,.conversation-toolbar,.composer-area,.workspace-preview-head button{display:none!important}.main-area{margin:0!important;width:100%!important}.page-root{height:auto!important;overflow:visible!important}.workspace-body.has-preview{display:block}.workspace-preview{position:static;height:auto;border:0}.workspace-preview-content{overflow:visible}}

/* Keep dense business content inside its own scroll region. */
.student-hub,.student-hub-body,.module-stack,.module-stack>.card{min-width:0;max-width:100%}
.student-hub,.module-stack{grid-template-columns:minmax(0,1fr)}
.seat-grid{max-width:100%;overflow-x:auto;padding-bottom:12px}
.blackboard{max-width:100%}
.section-head .toolbar-actions{flex-wrap:wrap}
.resource-filter,.materials-toolbar input,.history-search{border:1px solid #cbd2df;box-shadow:none;outline-offset:2px}
@media(max-width:767px){.section-head{min-width:0}.section-head .toolbar-actions{max-width:100%;gap:6px}.teaching-top-actions{justify-content:flex-end}.reminder-trigger{flex-shrink:0}}

.notice-record-open{flex:1;min-width:0;display:grid;gap:8px;text-align:left;background:none;border:0;padding:4px;overflow-wrap:anywhere}.notice-record-open small{color:var(--muted)}