.mobile-topbar,.mobile-bottom-nav{display:none}

@media (max-width:767px){
  :root{--mobile-page-x:16px;--mobile-bottom-h:66px}
  body{background:#FAF9F7}
  .desktop-topbar{display:none!important}
  .mobile-topbar{display:grid;grid-template-columns:44px minmax(0,1fr) auto 44px;align-items:center;gap:6px;height:56px;padding:0 8px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
  .mobile-icon-button{width:44px;height:44px;border:0;background:transparent;display:grid;place-items:center;border-radius:10px}
  .mobile-class-label{border:0;background:transparent;text-align:left;font-size:15px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .mobile-page-title{font-size:14px;color:var(--muted);white-space:nowrap}
  .mobile-topbar-spacer{width:44px}
  .main-area{margin-left:0;width:100%;padding-bottom:var(--mobile-bottom-h)}
  .page-root{padding:14px var(--mobile-page-x) 28px;max-width:none}
  .sidebar{width:min(82vw,340px);transform:translateX(-100%);padding:14px 12px;z-index:60}
  .sidebar.open{transform:translateX(0)}
  .sidebar-scrim.show{display:block;position:fixed;inset:0;background:rgba(20,32,34,.42);z-index:55}
  .mobile-bottom-nav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;height:var(--mobile-bottom-h);padding:6px max(6px,env(safe-area-inset-left)) max(6px,env(safe-area-inset-bottom));background:#fff;border-top:1px solid var(--line);z-index:50}
  .mobile-bottom-item{border:0;background:transparent;display:grid;place-items:center;align-content:center;gap:2px;font-size:11px;color:var(--muted)}
  .mobile-bottom-item.active{color:var(--teal-dark);font-weight:700}
  .mobile-bottom-item.record .mobile-bottom-icon{width:42px;height:42px;border-radius:50%;background:var(--teal);color:#fff;display:grid;place-items:center;margin-top:-18px;box-shadow:0 6px 18px rgba(20,143,138,.22)}
  .nav-group-label{padding:10px 12px 5px;font-size:11px;color:var(--muted);letter-spacing:.08em}
  .nav-group-items{display:grid;gap:2px}
  .nav-item{min-height:48px;padding:10px 12px;border-radius:10px;width:100%}
}

@media (min-width:768px) and (max-width:1023px){
  .sidebar{transform:translateX(-100%);transition:.2s}
  .sidebar.open{transform:translateX(0)}
  .sidebar-scrim.show{display:block;position:fixed;inset:0;background:rgba(20,32,34,.32);z-index:35}
  .main-area{margin-left:0;width:100%}
  .menu-toggle{display:inline-grid;place-items:center}
}

@media (max-width:767px){
  .mobile-dashboard{display:grid;gap:12px}
  .mobile-dashboard-date{display:flex;justify-content:space-between;align-items:end;padding:2px 2px 4px}
  .mobile-dashboard-date strong{font-size:20px}.mobile-dashboard-date span{font-size:13px;color:var(--muted)}
  .mobile-card{background:#fff;border:1px solid #eef0ee;border-radius:12px;padding:14px;box-shadow:none}
  .mobile-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.mobile-card-head h2{font-size:16px;margin:0}.mobile-card-head>span{font-size:12px;color:var(--muted)}
  .mobile-attendance-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;text-align:center}.mobile-attendance-grid b{display:block;font-size:24px}.mobile-attendance-grid span{font-size:11px;color:var(--muted)}
  .mobile-primary{width:100%;min-height:44px;margin-top:12px;border:0;border-radius:10px;background:var(--teal);color:#fff;font-weight:700}
  .mobile-link{border:0;background:transparent;color:var(--teal-dark);padding:8px;font-size:12px}
  .mobile-list{display:grid}.mobile-list-row{min-height:54px;display:flex;align-items:center;gap:10px;border-top:1px solid #f0f2f1}.mobile-list-row:first-child{border-top:0}.mobile-list-main{min-width:0;flex:1}.mobile-list-main strong,.mobile-list-main span{display:block}.mobile-list-main span{font-size:12px;color:var(--muted);margin-top:3px}
  .mobile-list-button{width:100%;border-left:0;border-right:0;border-bottom:0;background:transparent;text-align:left;padding:0}.mobile-chevron{font-size:22px;color:var(--muted)}
  .mobile-status-dot{width:8px;height:8px;border-radius:50%;background:#9aa8a9;flex:0 0 auto}.mobile-status-dot.priority-high{background:var(--red)}.mobile-status-dot.priority-medium{background:var(--orange)}.mobile-status-dot.priority-low{background:var(--teal)}
  .mobile-lesson-row{display:grid;grid-template-columns:72px minmax(0,1fr);gap:12px;padding:10px 0;border-top:1px solid #f0f2f1}.mobile-lesson-row:first-child{border-top:0}.mobile-lesson-time{font-size:11px;color:var(--muted);line-height:1.55}
  .mobile-empty{padding:8px 0;color:var(--muted);font-size:13px}
}

@media (max-width:767px){
  .sidebar-footer .footer-action{display:none!important}
}

/* V2.7.2 mobile drawer group collapse */
@media (max-width:767px){
  .nav-group{margin-bottom:6px}.nav-group-toggle{min-height:46px;padding:10px 11px;font-size:14px;color:#405658}.nav-group-toggle.active-parent{background:#f0f8f6;color:var(--teal-dark)}.nav-group-items{margin-left:15px;padding-left:7px;border-left:1px solid #e1e9e8}.nav-group[data-nav-group="home"] .nav-group-items{margin-left:0;padding-left:0;border-left:0}.nav-group.is-collapsed .nav-group-items{display:none}.nav-group-chevron{margin-left:auto}.sidebar-footer{border-top:1px solid #ECE8E0}
}
@media (min-width:768px) and (max-width:1023px){
  .nav-group-toggle{min-height:42px}.nav-group-items{padding-left:8px}.nav-group.is-collapsed .nav-group-items{display:none}.sidebar-collapse-btn{display:none!important}
}

/* V2.8 mobile compact density */
@media (max-width:767px){
  :root{--mobile-page-x:12px;--mobile-bottom-h:60px}
  body{font-size:13px;background:var(--bg)}
  .mobile-topbar{height:48px;grid-template-columns:40px minmax(0,1fr) auto 40px;padding:0 6px;gap:4px}
  .mobile-icon-button{width:40px;height:40px;border-radius:8px}.mobile-class-label{font-size:14px;font-weight:600}.mobile-page-title{font-size:12px}.mobile-topbar-spacer{width:40px}
  .page-root{padding:10px var(--mobile-page-x) 20px}.main-area{padding-bottom:var(--mobile-bottom-h)}
  .sidebar{width:min(78vw,320px);padding:12px 10px;box-shadow:8px 0 24px rgba(15,23,42,.08)}.sidebar-scrim.show{background:rgba(17,24,39,.18)}
  .brand{height:64px;gap:9px;padding:0 2px 10px}.brand-mark{width:36px;height:36px;border-radius:9px;background:var(--teal);box-shadow:none}.brand strong{font-size:15px}.brand span{font-size:10px}
  .nav-group{margin-bottom:14px}.nav-group-toggle{min-height:26px;padding:3px 8px;color:#3F4743;font-size:11px;font-weight:500;background:transparent!important}.nav-group-toggle.active-parent{color:var(--weak)}.nav-group-icon{display:none}.nav-group-title{font-size:11px}.nav-group-items{margin:0;padding:0;border-left:0!important;display:grid;gap:2px}.nav-group[data-nav-group="home"] .nav-group-items{margin:0;padding:0}
  .nav-item{min-height:42px;padding:8px 10px;border-radius:8px;font-size:14px;gap:9px;color:#202622}.nav-item.active{background:var(--teal-soft);color:var(--teal-dark)}.nav-icon{width:20px}.nav-label{font-weight:500}
  .mobile-bottom-nav{height:var(--mobile-bottom-h);padding:4px max(5px,env(safe-area-inset-left)) max(4px,env(safe-area-inset-bottom))}.mobile-bottom-item{font-size:10px;gap:1px}.mobile-bottom-item.record .mobile-bottom-icon{width:38px;height:38px;margin-top:-14px;box-shadow:none}
  .mobile-dashboard{gap:10px}.mobile-dashboard-date{padding:1px 1px 2px}.mobile-dashboard-date strong{font-size:18px}.mobile-dashboard-date span{font-size:12px}
  .mobile-card{padding:10px 12px;border-radius:10px;border-color:var(--line)}.mobile-card-head{gap:8px;margin-bottom:8px}.mobile-card-head h2{font-size:15px}.mobile-card-head>span{font-size:11px}
  .mobile-attendance-grid b{font-size:21px}.mobile-attendance-grid span{font-size:10px}.mobile-primary{min-height:40px;margin-top:8px;border-radius:8px;font-size:13px}.mobile-link{padding:5px;font-size:11px}
  .mobile-list-row{min-height:46px;gap:8px}.mobile-list-main strong{font-size:13px}.mobile-list-main span{font-size:11px;margin-top:2px}.mobile-chevron{font-size:18px}
  .mobile-lesson-row{grid-template-columns:64px minmax(0,1fr);gap:9px;padding:8px 0}.mobile-lesson-time{font-size:10px}.mobile-empty{font-size:12px;padding:6px 0}
  .page-header{margin-bottom:12px;align-items:flex-start}.page-header h2{font-size:18px}.page-header p{font-size:12px}.page-tabs{gap:14px}.page-tab{font-size:12px;padding:6px 0 8px}
  .card{padding:12px;border-radius:10px}.toolbar{padding:12px;gap:10px}.toolbar h2{font-size:17px}.toolbar-actions{gap:6px}.btn{min-height:38px;padding:7px 10px;font-size:12px}.field input,.field select{min-height:40px}.field textarea{font-size:13px}
  .modal-backdrop{padding:8px}.modal{max-height:94vh;border-radius:10px}.modal-head{height:52px;padding:0 14px}.modal-head h2{font-size:16px}.modal-body{padding:14px}.form-grid{grid-template-columns:1fr;gap:12px}.field.full,.form-actions.full{grid-column:auto}
  .settings-row{min-height:58px;padding:10px 12px}.settings-copy strong{font-size:13px}.settings-copy small{font-size:11px}
  .data-table-wrap,.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}.data-table th,.data-table td{padding:8px 9px;font-size:12px}
}
@media (min-width:768px) and (max-width:1023px){
  .sidebar{width:min(42vw,330px);transform:translateX(-100%);transition:.18s;padding:14px 12px}.sidebar.open{transform:translateX(0);box-shadow:8px 0 24px rgba(15,23,42,.08)}.sidebar-scrim.show{display:block;position:fixed;inset:0;background:rgba(17,24,39,.18);z-index:35}.main-area{margin-left:0;width:100%}.menu-toggle{display:inline-grid;place-items:center}.page-root{padding:20px 22px 48px}.sidebar-collapse-btn{display:none!important}.data-table-wrap,.table-wrap{overflow-x:auto}
}
@media (max-width:767px){
  .student-page-header,.grade-page-header,.worklog-page-header,.attendance-page-header{display:grid;gap:10px}.student-page-header .toolbar-actions,.grade-page-header .toolbar-actions{width:100%;justify-content:flex-start;display:grid;grid-template-columns:1fr 1fr}.student-page-header .search-box{grid-column:1/-1;min-width:0;width:100%}.grade-page-header .select-control{grid-column:1/-1;width:100%}.student-table-panel{border-radius:8px}
  .attendance-summary{padding:10px;margin-bottom:10px}.attendance-history{padding:12px}.history-row{min-height:48px;padding:8px 0}.history-stats{gap:6px;font-size:10px}
  .grades-page>.grade-tabs-wrap{padding:0 12px;border-radius:8px 8px 0 0}.grades-page>.card,.grades-page>.data-card{border-radius:0 0 8px 8px}.grade-tabs{gap:14px;overflow-x:auto}.grade-tab{font-size:12px;white-space:nowrap}
  .worklog-controls{padding:10px 12px 0;border-radius:8px 8px 0 0}.worklog-summary{display:flex;gap:6px;flex-wrap:wrap}.worklog-summary span{padding:6px 8px;font-size:11px}.worklog-search{padding:8px 0}.worklog-list{padding:0 12px;border-radius:0 0 8px 8px}.worklog-item{padding:11px 0}.worklog-item{display:grid;gap:8px}.worklog-item .row-actions{justify-content:flex-start}
  .timetable-toolbar{padding:10px}.timetable-view-switch,.timetable-date-nav{gap:5px}.timetable-table th,.timetable-table td{padding:7px 6px;font-size:11px}.seat-grid{gap:6px}.committee-grid{grid-template-columns:1fr}.duty-detail{padding:10px}
  .profile-grid.two{grid-template-columns:1fr!important}.profile-panel{padding:10px!important}.profile-hero{padding:10px!important}.profile-dl{grid-template-columns:1fr!important}
}

@media (max-width:767px){
  .advanced-help-page{gap:10px}.advanced-help-hero,.advanced-help-section{padding:14px;border-radius:10px}.advanced-help-hero h2{font-size:18px}.advanced-help-hero>p{font-size:12px;line-height:1.7}.advanced-help-actions{display:grid;grid-template-columns:1fr 1fr;margin-top:12px}.advanced-help-actions .btn{width:100%}.advanced-help-path{display:grid;gap:4px}.advanced-help-steps{grid-template-columns:1fr}.advanced-help-examples{grid-template-columns:1fr}.advanced-help-usecases{grid-template-columns:1fr}.advanced-help-section-head h3{font-size:15px}
}

@media (max-width:767px){
  .materials-page{gap:10px}.materials-header{display:grid;gap:10px}.materials-header h2{font-size:20px;line-height:1.3}.materials-header .toolbar-actions{display:grid;grid-template-columns:1fr 1fr;width:100%}.material-overview{grid-template-columns:repeat(3,1fr);border-radius:10px}.material-overview>div{min-height:68px;padding:10px;border-right:1px solid var(--line)}.material-overview b{font-size:21px}.material-overview span{font-size:9px}.material-overview-copy{grid-column:1/-1!important;min-height:64px!important;border-top:1px solid var(--line);border-right:0!important}.material-overview-copy strong{font-size:12px}.material-tabs{overflow-x:auto;gap:14px}.material-tabs .page-tab{white-space:nowrap}.materials-inbox-list,.suggestion-list,.memory-list{border-radius:10px}.material-row{grid-template-columns:34px minmax(0,1fr);gap:10px;padding:13px 12px}.material-source{width:34px;height:34px;border-radius:9px;font-size:10px}.material-row-actions{grid-column:2;justify-content:flex-start}.material-row-title{align-items:flex-start;flex-wrap:wrap}.material-row-title strong{font-size:13px}.material-row-main p{font-size:11px}.material-meta{font-size:9px;gap:4px 8px}.review-toolbar{display:grid;gap:10px;padding:11px 12px}.review-toolbar .btn{width:100%}.suggestion-card{grid-template-columns:52px minmax(0,1fr);gap:10px;padding:13px 12px}.suggestion-main{min-width:0}.suggestion-title{align-items:flex-start;display:grid;gap:3px}.suggestion-title strong{font-size:13px}.suggestion-main>p{font-size:11px}.suggestion-diff{grid-template-columns:1fr;gap:6px}.suggestion-diff>i{transform:rotate(90deg)}.suggestion-meta{font-size:9px}.suggestion-actions{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,1fr)}.suggestion-actions .btn{min-width:0;padding:7px 5px}.memory-row{padding:13px 12px;display:grid;gap:10px}.memory-row strong{font-size:13px}.memory-row p{font-size:11px}.memory-row>div:last-child{display:flex;gap:12px}.materials-empty{padding:38px 14px}.material-dropzone{min-height:92px}.capture-file-list{max-height:100px;overflow:auto}.material-detail pre{max-height:190px}.ask-compose{grid-template-columns:1fr}.workspace-answer{padding:12px}.workspace-source-list button{grid-template-columns:44px minmax(0,1fr)}.workspace-source-list button small{display:none}.ai-assistant-head{display:grid}.ai-head-actions{display:grid;grid-template-columns:1fr 1fr}.ai-head-actions .btn{width:100%}
  .mobile-assistant-gate{width:100%;min-height:68px;border:1px solid #cfe0d8;border-radius:10px;background:#f2f8f5;padding:11px 12px;display:grid;grid-template-columns:30px minmax(0,1fr) auto;gap:9px;align-items:center;text-align:left;color:var(--text)}.mobile-assistant-gate.needs-review{border-color:#ecd9bd;background:#fff9f0}.mobile-assistant-gate>span:first-child{width:30px;height:30px;border-radius:8px;background:#fff;display:grid;place-items:center;color:var(--teal-dark)}.mobile-assistant-gate>span:nth-child(2){display:grid;gap:3px}.mobile-assistant-gate strong{font-size:13px}.mobile-assistant-gate small{color:var(--muted);font-size:10px}.mobile-assistant-gate>b{color:var(--muted);font-size:18px}
  .attendance-editor .attendance-list{overflow:hidden}.attendance-editor .attendance-row{grid-template-columns:68px 88px minmax(0,1fr);gap:7px;padding:8px}.attendance-editor .attendance-row select,.attendance-editor .attendance-note{min-width:0;width:100%;padding-left:7px;padding-right:7px}.todo-sheet-head{align-items:flex-start}.todo-sheet-row{grid-template-columns:20px minmax(0,1fr) auto}.todo-sheet-row .text-btn{padding:6px}.todo-sheet .btn{min-height:36px}
  .student-mobile-list{display:grid;gap:8px}.student-mobile-card{border:1px solid var(--line);border-radius:10px;background:#fff;padding:0 11px}.student-mobile-main{width:100%;min-height:58px;border:0;background:transparent;display:grid;grid-template-columns:36px minmax(0,1fr) auto;gap:9px;align-items:center;text-align:left;padding:9px 0}.student-mobile-main>span:nth-child(2){display:grid;gap:3px}.student-mobile-main strong{font-size:13px}.student-mobile-main small{color:var(--muted);font-size:10px}.student-mobile-main>b{color:var(--muted);font-size:18px}.student-mobile-meta{display:flex;flex-wrap:wrap;gap:5px 10px;padding:8px 0;border-top:1px solid var(--line);color:var(--muted);font-size:10px}.student-mobile-actions{display:flex;gap:4px;padding:4px 0 6px;border-top:1px solid var(--line)}.student-mobile-actions .text-btn{min-width:44px;min-height:44px;padding:8px 7px}.workspace-source-preview-head{display:grid}.workspace-source-preview-head .btn{width:100%}
}

/* Local design prototype — one-handed today workspace */
@media (max-width:767px){
  .mobile-today-dashboard{gap:10px;padding-bottom:8px}
  .mobile-today-dashboard .mobile-dashboard-date{align-items:center;padding:2px 1px 4px}.mobile-today-dashboard .mobile-dashboard-date>span{display:grid;gap:2px}.mobile-today-dashboard .mobile-dashboard-date strong{font-size:18px}.mobile-today-dashboard .mobile-dashboard-date small{font-size:11px;color:var(--muted)}
  .mobile-privacy{min-height:36px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:6px 10px;font-size:11px}.mobile-privacy.active{background:#33312C;color:#fff;border-color:#33312C}
  .mobile-attendance-gate{width:100%;min-height:72px;border:1px solid #EEDDBE;border-radius:10px;background:#FFF9F0;padding:12px;display:grid;grid-template-columns:10px minmax(0,1fr) auto;gap:10px;align-items:center;text-align:left}.mobile-attendance-gate.done{background:#F5F3EF;border-color:#D7E6DE}.mobile-gate-dot{width:9px;height:9px;border-radius:50%;background:var(--orange);box-shadow:0 0 0 4px rgba(216,135,32,.11)}.mobile-attendance-gate.done .mobile-gate-dot{background:var(--teal);box-shadow:0 0 0 4px rgba(40,116,93,.10)}.mobile-attendance-gate strong,.mobile-attendance-gate small{display:block}.mobile-attendance-gate strong{font-size:14px}.mobile-attendance-gate small{margin-top:4px;color:var(--muted);font-size:11px}.mobile-attendance-gate>b{color:var(--teal-dark);font-size:11px;white-space:nowrap}.mobile-attendance-gate.weekend{background:#F4F6F8;border-color:#DCE2E8}.mobile-attendance-gate.weekend .mobile-gate-dot{background:#8E9BA8;box-shadow:0 0 0 4px rgba(112,128,144,.10)}.mobile-attendance-gate.weekend>b{color:#5B6B7A}
  .mobile-now-card{background:#33312C;color:#fff;border-radius:10px;padding:15px 16px}.mobile-now-card>div{display:flex;align-items:center;justify-content:space-between;gap:10px}.mobile-now-card>div span{font-size:11px;color:#BFD0C8}.mobile-now-card time{font-size:12px;color:#DDE8E3;font-variant-numeric:tabular-nums}.mobile-now-card h2{margin:16px 0 4px;font-size:23px;letter-spacing:-.02em}.mobile-now-card p{margin:0;color:#C8D4CF;font-size:11px}.mobile-now-card>button{min-height:38px;margin-top:14px;border:1px solid rgba(255,255,255,.24);border-radius:8px;background:transparent;color:#fff;padding:7px 10px;font-size:11px}
  .mobile-quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.mobile-quick-actions>button{min-height:68px;border:1px solid var(--line);border-radius:10px;background:#fff;padding:12px;text-align:left}.mobile-quick-actions strong,.mobile-quick-actions span{display:block}.mobile-quick-actions strong{font-size:14px}.mobile-quick-actions span{margin-top:5px;color:var(--muted);font-size:10px}
  .mobile-follow-card{padding-bottom:4px}.mobile-student-avatar{width:34px;height:34px;border-radius:9px;background:var(--teal-soft);color:var(--teal-dark);display:grid;place-items:center;font-size:12px;font-weight:700}.privacy-on .mobile-student-avatar{background:#EFF1F0;color:#56605C}
  .mobile-action-row{min-height:48px;display:flex;align-items:center;gap:9px;border-top:1px solid var(--line)}.mobile-action-row:first-child{border-top:0}
  .mobile-today-dashboard .mobile-card{padding:12px;border-radius:10px;border-color:var(--line)}.mobile-today-dashboard .mobile-card-head{margin-bottom:6px}.mobile-today-dashboard .mobile-list-row{min-height:50px}.mobile-today-dashboard .mobile-lesson-row{position:relative;grid-template-columns:58px minmax(0,1fr) auto;min-height:50px}.mobile-today-dashboard .mobile-lesson-row.current{margin:0 -6px;padding-left:6px;padding-right:6px;background:#F5F3EF;border-radius:8px;border-top-color:transparent}.mobile-current-badge{font-size:9px;color:var(--teal-dark);background:var(--teal-soft);border-radius:999px;padding:3px 6px}
  .quick-record-sheet>button{min-height:64px}.student-finder-list{max-height:60vh}
}

/* ===== 抽屉线程入口（2026-09-19）：样式在 assistant.css 手机块，此处只控制显隐 ===== */
.sidebar-threads{border-top:1px solid var(--line);margin-top:8px;padding:0 4px 8px;width:100%;max-width:100%;box-sizing:border-box;overflow:hidden}
.sidebar-threads .nav-thread{display:flex;justify-content:space-between;align-items:center;gap:8px;width:100%;max-width:100%;box-sizing:border-box;border:0;background:transparent;text-align:left;padding:9px 10px;border-radius:10px;font-size:13px;color:var(--ink)}
.sidebar-threads .nav-thread span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sidebar-threads .nav-thread small{color:var(--muted);font-size:11px;flex:0 0 auto}
.sidebar-threads .nav-threads-empty{font-size:12px;color:var(--muted);padding:6px 10px}
@media (min-width:768px) and (max-width:1023px){
  .sidebar-threads{display:block}
}
@media (max-width:767px){
  .sidebar-threads{display:block}
}