/* Apple-inspired web workbench: system type, solid content, translucent chrome.
   Layers: navigation 60, sheets 70, previews 80, feedback 90; native dialogs use top layer. */
:root,html[data-theme="light"]{
  --wb-bg:#f2f2f7;--wb-surface:#fff;--wb-secondary:#f5f5f7;--wb-text:#1d1d1f;--wb-muted:#62626b;--wb-line:rgba(60,60,67,.16);--wb-chrome:rgba(249,249,251,.94);--wb-accent:#b8325b;
}
html[data-theme="dark"]{--wb-bg:#171719;--wb-surface:#242426;--wb-secondary:#303033;--wb-text:#f5f5f7;--wb-muted:#b3b3bc;--wb-line:rgba(220,220,230,.18);--wb-chrome:rgba(36,36,38,.94);--wb-accent:#f47c9e}
@media(prefers-color-scheme:dark){html:not([data-theme]){color-scheme:dark;--wb-bg:#171719;--wb-surface:#242426;--wb-secondary:#303033;--wb-text:#f5f5f7;--wb-muted:#b3b3bc;--wb-line:rgba(220,220,230,.18);--wb-chrome:rgba(36,36,38,.94);--wb-accent:#f47c9e}}
:root,html[data-theme="light"],html[data-theme="dark"]{
  --bg:var(--wb-bg);--bg2:var(--wb-surface);--bg3:var(--wb-secondary);--bg4:var(--wb-secondary);--text:var(--wb-text);--text2:var(--wb-muted);--text3:var(--wb-muted);--muted:var(--wb-muted);--subtle:var(--wb-muted);--border:var(--wb-line);--border2:var(--wb-line);--line:var(--wb-line);--line-strong:var(--wb-line);--panel:var(--wb-surface);--panel-solid:var(--wb-surface);--field:var(--wb-secondary);--surface:var(--wb-surface);--surface-soft:var(--wb-secondary);--accent:var(--wb-accent);--accent-strong:var(--wb-accent);--accent-g:var(--wb-accent);--shadow:none;
}
html,body,html[data-theme] body{background:var(--wb-bg);background-image:none;color:var(--wb-text)}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-optical-sizing:auto;line-height:1.5}
button,a,input,select,textarea{touch-action:manipulation}
button:active,.btn:active,.button:active{transform:scale(.98);transition:transform 90ms ease-out}
input,select,textarea{color:var(--wb-text);accent-color:var(--wb-accent)}
input::placeholder,textarea::placeholder{color:var(--wb-muted);opacity:1}
.card,.panel,.login-card,.register-card{background:var(--wb-surface);border:1px solid var(--wb-line);border-radius:16px;box-shadow:none;backdrop-filter:none}
html[data-theme] .card,html[data-theme] .login-card,html[data-theme] .stat-card{background:var(--wb-surface);box-shadow:none;backdrop-filter:none}
html[data-theme] .sidebar,html[data-theme] .sidebar-brand{background:var(--wb-chrome);box-shadow:none}
html[data-theme] .sidebar-item.active{background:var(--accent-soft);box-shadow:none}
html[data-theme] .form-input,html[data-theme] .login-input,html[data-theme] .sch-table input{box-shadow:none}
html[data-theme] .btn-ghost{background:var(--wb-secondary);color:var(--wb-text);box-shadow:none}
html[data-theme] .admin-page-tabs{background:var(--wb-secondary);box-shadow:none;backdrop-filter:none}
.card{padding:24px;margin-bottom:20px}
.main-content{max-width:1480px;margin-inline:auto}
.page-header{margin-bottom:24px;padding-bottom:20px;border-color:var(--wb-line)}
.page-title{font-size:28px;font-weight:700;letter-spacing:-.6px;line-height:1.25}
.page-title::before{display:none}
.page-desc,.card-desc{color:var(--wb-muted);line-height:1.6}
.card-title{font-weight:650;letter-spacing:-.2px}
.btn,.button{min-height:42px;border-radius:10px;box-shadow:none;font-weight:600}
.btn-primary,.button.primary,.teacher-collage .btn-primary{background:var(--wb-accent);color:#fff;border-color:transparent}
html[data-theme=dark] .btn-primary,html[data-theme=dark] .button.primary{color:#171719}
@media(prefers-color-scheme:dark){html:not([data-theme]) .btn-primary,html:not([data-theme]) .button.primary,html:not([data-theme]) .mobile-sheet-trigger-primary strong,html:not([data-theme]) .mobile-sheet-trigger-primary b{color:#171719}}
.btn-ghost,.button.ghost{background:var(--wb-secondary);color:var(--wb-text);border-color:var(--wb-line);box-shadow:none}
.form-input,.manager-shell input,.manager-shell select,.manager-shell textarea{background:var(--wb-secondary);border:1px solid var(--wb-line);border-radius:10px;box-shadow:none;min-width:0}
.form-input{min-height:42px}
.form-label,.manager-shell label>span{color:var(--wb-muted);font-weight:500}
.sidebar{background:var(--wb-chrome);box-shadow:none;border-color:var(--wb-line)}
.sidebar-label,.sidebar-item,.sidebar-item .icon{color:var(--wb-muted)}
.sidebar-item.active{color:var(--wb-accent);background:var(--accent-soft)}
.sidebar-item{min-height:42px}
.school-group-head{background:transparent;border-color:var(--wb-line);padding:4px 0 18px}
.class-entry{padding:18px 0;align-items:center;gap:16px;border-color:var(--wb-line)}
.class-entry-title{font-size:16px;font-weight:650}
.admin-table th,.admin-table td{vertical-align:middle;padding:14px 16px;border-color:var(--wb-line)}
.admin-table thead th{background:var(--wb-secondary);color:var(--wb-muted);font-weight:600}
.roster-table td:nth-child(3),.roster-table th:nth-child(3){text-align:center}
.roster-table td:nth-child(5),.roster-table th:nth-child(5){text-align:center}
.roster-table td:last-child,.roster-table th:last-child{text-align:right}
.roster-table td:nth-child(2) strong{font-weight:600}
.roster-table td:first-child{box-shadow:none}
.bounded-list-scroll{scrollbar-width:thin}
.admin-modal-panel{background:var(--wb-surface);border-color:var(--wb-line);border-radius:20px;box-shadow:0 24px 80px rgba(0,0,0,.16)}
.admin-modal-header,.admin-modal-footer{background:var(--wb-surface);border-color:var(--wb-line)}
.admin-modal-header .card-desc{margin-bottom:0}
.manager-shell{width:min(1280px,calc(100% - 48px));padding-top:24px}
.manager-header{align-items:center;margin-bottom:24px}
.manager-header h1{font-size:28px;font-weight:700;letter-spacing:-.6px}
.manager-header .teacher-brand{font-size:12px;font-weight:500;color:var(--wb-muted)}
.manager-header .teacher-brand img{width:26px;height:26px;border-radius:6px}
.manager-header p{font-size:13px;color:var(--wb-muted)}
.header-actions{align-items:center}
.workspace-switcher.panel{padding:16px;grid-template-columns:minmax(180px,250px) minmax(0,1fr);gap:14px;background:var(--wb-surface)}
.workspace-switcher .permission-note{grid-column:1/-1;text-align:left;font-size:12px;margin:0}
.module-tabs{background:var(--wb-secondary);border:0;border-radius:11px;padding:4px}
.module-tab{font-weight:600;color:var(--wb-muted)}
.module-tab.active{background:var(--wb-surface);color:var(--wb-accent);border-color:transparent;box-shadow:0 1px 4px rgba(0,0,0,.08)}
.panel-head{align-items:center}
.section-kicker,.eyebrow{display:none}
.records-panel>.panel-head,.teacher-todo-list-panel>.panel-head,.teacher-event-list-panel>.panel-head,.teacher-public-panel>.panel-head,.schedule-panel>.panel-head{border:0}
.record,.teacher-todo-item,.teacher-event-item,.teacher-public-item,.teacher-activity-card{background:var(--wb-surface);border-color:var(--wb-line);box-shadow:none;border-radius:12px}
.teacher-quick-table thead{background:var(--wb-secondary);color:var(--wb-text)}
.teacher-quick-table .lesson-section th{background:var(--accent-soft);color:var(--wb-accent)}
.teacher-quick-table .lesson-subject{font-size:16px;font-weight:600}
.teacher-collage .card{background:var(--wb-surface);padding:20px}
.teacher-collage .collage-preview-card{background:var(--wb-surface)}
.teacher-collage .collage-canvas-shell{background:var(--wb-secondary)}
.teacher-collage .collage-link-content{margin-top:0;border-top:0;padding-top:0}
.teacher-collage .collage-dropzone{position:relative;background:var(--wb-secondary);min-height:112px;align-content:center}
.teacher-collage .collage-dropzone input[type=file]{position:absolute;width:1px;height:1px;padding:0;opacity:0;overflow:hidden}
.teacher-collage .collage-dropzone:focus-within{outline:2px solid var(--wb-accent);outline-offset:3px}
.workbench-tabbar{display:none}
/* A single composer workflow: roster and format first, result spans both. */
.cp-heading{margin:24px 0 18px}.cp-heading h2{font-size:24px;letter-spacing:-.4px}.cp-heading p{margin:6px 0;color:var(--wb-muted)}
.cp-workspace{display:grid;grid-template-columns:minmax(260px,.8fr) minmax(0,1.2fr);gap:18px;align-items:start}
.cp-workspace .panel{margin:0;padding:24px}
.cp-workspace h3{font-size:17px;letter-spacing:-.2px;margin:0 0 16px}
.cp-workspace .panel-head h3{margin:0}
.cp-workspace label:not(.cp-person),.cp-calendar label{display:block;font-size:13px;font-weight:500;color:var(--wb-muted);margin:16px 0 7px}
.cp-workspace input:not([type=checkbox]),.cp-workspace select,.cp-workspace textarea,.cp-calendar input{width:100%;min-height:44px;padding:11px 12px;font:inherit;color:var(--wb-text);border:1px solid var(--wb-line);background:var(--wb-secondary);border-radius:10px}
.cp-selection-actions{display:flex;gap:8px;margin:12px 0}
.cp-people{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;max-height:560px;overflow:auto;overscroll-behavior:contain}
.cp-person{display:flex;gap:10px;align-items:center;padding:12px;border-radius:10px;background:var(--wb-secondary);cursor:pointer}
.cp-person input{width:18px;height:18px;flex-shrink:0}.cp-person:has(input:checked){background:var(--accent-soft);outline:1px solid var(--wb-accent)}
.cp-person strong{font-size:14px;font-weight:600}.cp-person small{display:block;color:var(--wb-muted);font-size:11px}
.cp-empty{grid-column:1/-1;padding:24px 0;text-align:center;color:var(--wb-muted)}
.cp-date-label{display:flex;align-items:center;justify-content:space-between;margin-top:16px}.cp-date-label label{margin:0!important}
.cp-date-button{padding:7px 0;border:0;color:var(--wb-accent);background:transparent;font:inherit;font-size:13px}
.cp-options{margin-top:24px}.cp-matter-group{margin-bottom:18px}.cp-matter-group h3{font-size:13px;color:var(--wb-muted);margin-bottom:8px}
.cp-matter-group>div{display:flex;flex-wrap:wrap;gap:8px}.cp-matter-group button{font:inherit;font-size:14px;min-height:44px;padding:9px 13px;border:1px solid var(--wb-line);border-radius:10px;background:var(--wb-secondary);color:var(--wb-text)}
.cp-matter-group button[aria-pressed=true]{border-color:var(--wb-accent);background:var(--accent-soft);color:var(--wb-accent)}
.cp-result{grid-column:1/-1}.cp-result textarea{resize:vertical;line-height:1.8}.cp-result .panel-head p{font-size:13px;margin-top:5px}
.cp-calendar{position:fixed;inset:0;margin:auto;width:min(420px,calc(100% - 32px));height:fit-content;max-height:calc(100dvh - 48px);padding:24px;border:1px solid var(--wb-line);border-radius:20px;background:var(--wb-surface);color:var(--wb-text);overflow:auto}
.cp-calendar::backdrop{background:rgba(0,0,0,.4)}.cp-calendar h2{font-size:20px}.cp-calendar p{font-size:13px;margin:16px 0}.cp-calendar footer{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}
.image-export-dialog{background:var(--wb-surface);color:var(--wb-text);border-color:var(--wb-line)}
.image-export-dialog p,.image-export-dialog .image-export-status,.image-export-dialog .image-export-file{color:var(--wb-muted)}
@media(max-width:768px){
  .btn,.mobile-theme-toggle,.admin-modal-close,.admin-page-tab{min-height:44px;min-width:44px}
  .main-content{padding:22px 16px 32px!important}
  .page-header{display:block!important;padding-bottom:0;border:0;margin-bottom:20px}
  .page-title{font-size:26px;letter-spacing:-.5px}.page-desc{font-size:13px;margin-top:6px}
  .page-header .workspace-actions{margin-top:16px;display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-start}
  .page-header .workspace-actions .btn{padding:10px 12px;font-size:13px;min-height:44px}
  .card{padding:18px;margin-bottom:16px;border-radius:16px}.card-title{font-size:18px}
  .homework-card-head{align-items:center;gap:12px}.homework-card-head .card-desc{margin:6px 0 12px}
  .teacher-service-command{gap:12px!important;padding:16px!important}
  .teacher-service-command .command-copy{font-size:13px;line-height:1.5}
  .teacher-service-command>.btn{justify-self:start;min-width:80px}
  .mobile-admin-topbar{background:var(--wb-chrome);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);box-shadow:none;border:0;padding-inline:16px}
  .mobile-admin-title{font-size:15px;font-weight:650}.mobile-admin-subtitle{display:none}
  .mobile-nav-panel{top:auto;left:0;right:0;bottom:0;max-height:85dvh;border-radius:24px 24px 0 0;background:var(--wb-surface)!important;border:0;box-shadow:0 -12px 48px rgba(0,0,0,.18);transform:translateY(20px)}
  .mobile-nav-group.active{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .mobile-nav-item,.mobile-nav-item.is-frequent{font-size:14px;font-weight:600;min-height:54px;border:0;border-radius:12px;background:var(--wb-secondary);color:var(--wb-text)}
  .mobile-nav-item .icon{display:none}.mobile-nav-item.is-frequent::after{display:none}
  .mobile-nav-item.active,.mobile-nav-item.is-frequent.active{background:var(--accent-soft);color:var(--wb-accent)}
  .mobile-nav-head{padding:20px;border:0}.mobile-nav-body{padding:0 20px calc(24px + env(safe-area-inset-bottom))}
  .mobile-nav-panel .teacher-workspace-link{grid-column:1/-1;margin-top:8px;border:1px solid var(--wb-line)}
  .admin-modal-panel{border-radius:24px 24px 0 0;background:var(--wb-surface)}
  .admin-modal-header{padding:20px}.admin-modal-body{padding:20px}.admin-modal-footer{padding:16px 20px calc(16px + env(safe-area-inset-bottom))}
  .mobile-panel-trigger{min-height:48px;margin-bottom:16px!important;background:var(--wb-secondary)!important;color:var(--wb-text)!important;border:1px solid var(--wb-line)!important;font-size:14px;font-weight:600}
  .admin-table.roster-table{display:block;width:100%;min-width:0;table-layout:auto}.student-roster-scroll{max-height:none;overflow:visible;border:0}
  .roster-table colgroup,.roster-table thead{display:none}
  .roster-table tbody{display:grid;gap:10px}
  .roster-table tbody tr{display:grid;grid-template-columns:1fr auto;gap:6px 12px;padding:14px;background:var(--wb-secondary);border:0;border-radius:12px}
  .roster-table td{display:block;border:0;padding:0!important;text-align:left!important;min-width:0;width:auto!important}
  .roster-table td:nth-child(1){grid-column:1;grid-row:2;color:var(--wb-muted);font-size:12px}
  .roster-table td:nth-child(1)::before{content:'学号 ';color:var(--wb-muted)}
  .roster-table td:nth-child(2){grid-column:1;grid-row:1;font-size:16px}
  .roster-table td:nth-child(3){grid-column:2;grid-row:1;justify-self:end;font-size:13px}
  .roster-table td:nth-child(4){grid-column:1;grid-row:3;color:var(--wb-muted);font-size:12px}
  .roster-table td:nth-child(5){grid-column:2;grid-row:2;justify-self:end}
  .roster-table td:nth-child(6){grid-column:1/-1;grid-row:4;display:flex;justify-content:flex-end;gap:8px;margin-top:6px}
  .school-group-head{padding:0 0 14px;gap:12px}.class-entry{padding:16px 0;gap:10px}
  .command-card-summary{display:flex!important;align-items:center;justify-content:space-between;gap:16px}
  .command-card-summary .card-title{margin-bottom:6px}.command-card-summary>button{flex-shrink:0}
}
@media(max-width:720px){
  .manager-shell .button,.cp-date-button,.module-picker-head button,.mobile-sheet-close{min-height:44px!important;min-width:44px}
  .manager-shell{width:100%;padding:calc(16px + env(safe-area-inset-top)) 16px calc(92px + env(safe-area-inset-bottom))}
  .manager-header{display:flex;align-items:center;gap:12px;margin-bottom:20px;padding:0}
  .manager-header>div:first-child{min-width:0;flex:1}.manager-header h1{font-size:25px;font-weight:700;line-height:1.25;margin:8px 0 4px}
  .manager-header p{font-size:12px;margin:0}.manager-header .teacher-brand{font-size:12px;gap:7px}
  .header-actions{flex-direction:column;align-items:flex-end;gap:6px;flex-shrink:0}.header-actions .connectivity{font-size:11px;background:none;border:0;padding:0}
  .header-actions .button{padding:7px 12px;min-height:38px;font-size:12px}
  .workspace-switcher.panel{grid-template-columns:minmax(0,1fr) auto;gap:12px;margin-bottom:22px;padding:14px;border:0;background:var(--wb-surface)}
  .workspace-switcher label{min-width:0}.workspace-switcher label>span{font-size:11px;margin-bottom:5px}
  .workspace-switcher select{width:100%;min-height:42px;font-size:15px!important;padding:8px 10px;background:var(--wb-secondary)}
  .workspace-switcher .permission-note{display:none}
  .module-picker-trigger{display:flex;order:initial;width:auto;min-height:44px;gap:0;padding:10px 12px;border:0;background:var(--wb-secondary);box-shadow:none;border-radius:10px}
  .module-picker-trigger>span,.module-picker-trigger>b{display:none}.module-picker-trigger strong{font-size:13px;white-space:nowrap;color:var(--wb-accent);font-weight:600}
  .module-picker-trigger strong::after{content:' ⌄';font-size:15px}
  .module-tabs{margin:0;padding:20px 20px calc(24px + env(safe-area-inset-bottom));border-radius:24px 24px 0 0;background:var(--wb-surface);gap:8px}
  .module-picker-head{padding-bottom:14px}.module-picker-head button{background:var(--wb-secondary);border:0;border-radius:50%;width:36px;height:36px}
  .module-tab{background:var(--wb-secondary);border:0;min-height:54px;border-radius:12px;font-weight:600;color:var(--wb-text);text-align:left}
  .module-tab.active{background:var(--accent-soft);color:var(--wb-accent);box-shadow:none}
  .workbench-tabbar{position:fixed;left:0;right:0;bottom:0;z-index:50;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));padding:9px 12px calc(9px + env(safe-area-inset-bottom));background:var(--wb-chrome);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-top:1px solid var(--wb-line)}
  .workbench-tabbar button{border:0;background:transparent;font:inherit;font-size:14px;font-weight:500;color:var(--wb-muted);min-height:44px;border-radius:10px}
  .workbench-tabbar button.active,.workbench-tabbar button[data-workbench-module=homework]:first-child{color:var(--wb-accent)}
  body[data-workspace-module] .workbench-tabbar button:not(.active){color:var(--wb-muted)}
  .workbench-tabbar button.active{background:var(--accent-soft);font-weight:650}
  .panel{padding:18px;border-radius:16px;margin-bottom:16px;background:var(--wb-surface);box-shadow:none;backdrop-filter:none}
  .records-panel,.teacher-todo-list-panel,.teacher-event-list-panel,.teacher-public-panel,.teacher-activity-panel,.schedule-panel,.focused-panel{background:var(--wb-surface);border-color:var(--wb-line);box-shadow:none}
  .records-panel h2,.teacher-todo-list-panel h2,.teacher-event-list-panel h2,.teacher-public-panel h2,.teacher-activity-panel h2,.schedule-panel h2,.focused-panel h2{color:var(--wb-text);font-size:19px;font-weight:650}
  .record,.teacher-todo-item,.teacher-event-item,.teacher-public-item,.teacher-activity-card{background:var(--wb-secondary);border-color:transparent;color:var(--wb-text)}
  .record-title,.teacher-todo-title,.teacher-event-item-head strong,.teacher-public-item h3,.teacher-activity-card h3{color:var(--wb-text)}
  .record-title{font-size:16px;font-weight:650}.record-actions{gap:6px}.record-actions .button{min-height:40px;padding:8px 12px}
  .mobile-sheet-trigger{min-height:54px;padding:12px 16px;box-shadow:none;background:var(--wb-surface);border:1px solid var(--wb-line);border-radius:12px;margin-bottom:12px}
  .mobile-sheet-trigger strong{font-size:15px;font-weight:600;color:var(--wb-text)}.mobile-sheet-trigger small{display:none}
  .mobile-sheet-trigger b,.mobile-sheet-trigger:not(.mobile-sheet-trigger-primary) b{background:none;color:var(--wb-accent);font-size:13px;font-weight:600;padding:0}
  .mobile-sheet-trigger-primary{background:var(--wb-accent);border-color:transparent;box-shadow:none;min-height:54px}
  .mobile-sheet-trigger-primary strong,.mobile-sheet-trigger-primary b{color:#fff;background:none}
  .mobile-sheet-panel.is-mobile-open{background:var(--wb-surface);border-radius:24px 24px 0 0;padding:24px 20px calc(24px + env(safe-area-inset-bottom));box-shadow:0 -16px 60px rgba(0,0,0,.2)}
  .mobile-sheet-panel h2{border:0;padding:0;color:var(--wb-text);font-weight:650}
  .mobile-sheet-close{border:0;border-radius:50%;background:var(--wb-secondary)}
  .teacher-quick-wrap{max-width:100%;overflow:auto;-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain}
  .teacher-quick-table{min-width:760px}.teacher-quick-table tbody th{position:sticky;left:0;z-index:1;background:var(--wb-surface)}
  .teacher-quick-toolbar{gap:10px}.teacher-quick-toolbar label{width:100%}
  .teacher-collage .card{padding:18px}.teacher-collage .collage-copy-row{grid-template-columns:minmax(0,1fr) 32px;gap:8px}.teacher-collage .collage-copy-row label{grid-column:1/-1}
  .cp-heading{margin:0 0 16px}.cp-heading h2{font-size:24px}.cp-heading p{font-size:13px}
  .cp-workspace{grid-template-columns:1fr;gap:16px}.cp-workspace .panel{padding:18px}.cp-result{grid-column:auto}.cp-people{max-height:330px}
  .cp-result .panel-head{align-items:center}.cp-result .panel-head p{max-width:22ch;font-size:12px}
  .cp-calendar input{font-size:16px;min-height:44px}.image-export-dialog{padding:20px;width:calc(100% - 32px)}
}
@media(prefers-reduced-transparency:reduce){.mobile-admin-topbar,.workbench-tabbar,.sidebar{background:var(--wb-surface);backdrop-filter:none;-webkit-backdrop-filter:none}}
@media(prefers-contrast:more){:root{--wb-line:currentColor}.card,.panel,.form-input{border-width:1px}.workbench-tabbar{background:var(--wb-surface)}}
@media(prefers-reduced-motion:reduce){button:active,.btn:active,.button:active{transform:none}}
@media print{.workbench-tabbar{display:none!important}}