/* Shared workspace theme. Rendering/scoring content and status meaning stay intact. */
:root{--ui-ink:#263e35;--ui-muted:#777e74;--ui-accent:#285e4c;--ui-soft:#edf3ed;--ui-line:#e1e5dc;--ui-paper:#fffefa;--ui-canvas:#f7f7f1;--ui-radius:14px}
body:not(.portal-visitor){background:var(--ui-canvas);color:var(--ui-ink)}
body:not(.portal-visitor)>.header{background:#244b3f;padding:16px 28px;min-height:70px;box-shadow:0 1px 0 #143e2d22}
.header .user-trigger,.header .user-box>.btn{min-height:36px;border-color:#ffffff35;background:#ffffff0d}
.tabs{width:min(1360px,100%);margin:0 auto;padding:22px 24px 12px;gap:10px;align-items:center;flex-wrap:wrap}
.tabs .tab{border-radius:8px;background:transparent;padding:8px 2px;color:#839082;font-size:13px}.tabs .tab.active{background:transparent;color:#365746;font-weight:650}.tabs #backHomeBtn{background:#fffefa;border-color:var(--ui-line);border-radius:22px;padding:8px 16px}
body>.panel:not(#panel-home){width:calc(100% - 48px);max-width:1312px;align-self:center;margin:0 24px 28px;padding:28px;border:1px solid var(--ui-line);border-radius:18px;background:var(--ui-paper);box-shadow:0 5px 20px #203d2e03;min-width:0}
.panel>h2,.workspace-heading h2{font:650 26px/1.5 "Songti SC","STSong",serif;color:var(--ui-ink);letter-spacing:.5px;margin:0 0 8px}.workspace-heading{padding-bottom:20px;margin-bottom:20px;border-bottom:1px solid var(--ui-line)}.workspace-heading p{color:var(--ui-muted);font-size:13px;line-height:1.8}
.panel>h2+.hint{margin-bottom:20px}.panel .grade-hero{background:var(--ui-accent);box-shadow:none;border-radius:14px;padding:24px;gap:18px;margin-bottom:24px}.panel .grade-hero h2{font-size:24px;letter-spacing:.5px}.panel .grade-hero p{line-height:1.8;opacity:.78;margin-top:6px}.panel .grade-hero-icon{background:#ffffff15;border-radius:12px}.panel .grade-card,.panel .grade-fold{box-shadow:none;border-color:var(--ui-line);background:#fff;border-radius:var(--ui-radius);padding:22px}.panel .grade-card{margin-bottom:20px}
#panel-grade{--ui-accent:#a85b3b;--ui-soft:#faf0e8}#panel-grade .grade-hero{background:#af603f}.panel .hw-subject-head h3{color:var(--ui-ink);font-size:17px}.panel .hw-subject-head{margin-bottom:18px}
.panel .btn,.modal .btn,dialog .btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:38px;line-height:1.5;background:#f1f3ed;color:#3c5847;border:1px solid #dce3d8;border-radius:8px;padding:8px 14px;font-size:13px;text-decoration:none;white-space:normal;box-shadow:none;transition:background .15s,border-color .15s}
.panel .btn:hover,.modal .btn:hover,dialog .btn:hover{background:#e6ece1;border-color:#b8c9b7}.panel .btn.primary,.modal .btn.primary,dialog .btn.primary{background:var(--ui-accent);color:#fff;border-color:var(--ui-accent);box-shadow:none}.panel .btn.primary:hover,.modal .btn.primary:hover{filter:brightness(.94)}.panel .btn:disabled,.modal .btn:disabled{opacity:.48;filter:none}
.panel :is(button,a,input,select,textarea,summary):focus-visible,.modal :is(button,input,select,textarea):focus-visible,dialog :is(button,input):focus-visible{outline:2px solid #779c7e;outline-offset:3px}
.panel input:not([type=checkbox]):not([type=radio]):not([type=file]):not([type=hidden]),.panel select,.panel textarea,.modal input:not([type=checkbox]):not([type=radio]):not([type=file]):not([type=hidden]),.modal select,.modal textarea{border:1px solid #d9e0d5;border-radius:8px;min-height:40px;background:#fff;color:#33473b;padding:10px 12px;font-size:14px;max-width:100%;box-sizing:border-box}
.panel :is(input,select,textarea):focus,.modal :is(input,select,textarea):focus{border-color:#8ca58a;box-shadow:0 0 0 3px #63826b12}.panel textarea,.modal textarea{line-height:1.8;resize:vertical;min-height:100px}.panel input::placeholder,.panel textarea::placeholder{color:#979d92}
.panel .row{gap:12px;line-height:1.8;margin-bottom:14px}.panel .row label{color:#4e6051;font-size:13px}.panel .hint{color:var(--ui-muted);line-height:1.9}.panel .info{color:#52705b;line-height:1.85}.panel .grade-field{gap:14px;margin-bottom:18px}.panel .grade-field label,.tutor-form>label{font-size:13px;color:#4f5f50}.panel .grade-field input{padding:11px 13px}.panel .grade-upload-row{gap:12px;margin:16px 0}.panel .grade-upload-btn,.panel .tutor-form .tutor-file{border-color:#b8cdb9;background:#f4f7f0;color:#456347;border-radius:10px;box-shadow:none}.panel .grade-upload-btn:hover,.panel .tutor-form .tutor-file:hover{background:#eaf0e4;border-color:#8faa92}.panel .grade-answer-btn{background:#f5f4ee;border-color:#e1e2d6;color:#716f58}.panel .grade-submit{box-shadow:none}.panel input[type=file]{font-size:13px;max-width:100%;color:#77816f}.panel input[type=file]::file-selector-button{background:#eaf0e5;color:#426244;border:1px solid #cfddc9;border-radius:7px;padding:9px 14px;margin-right:12px;font-size:13px;cursor:pointer;box-shadow:none}
.panel .tutor-task-card h3,.panel .grade-card>h3{color:var(--ui-ink);font-size:17px}.panel .tutor-task-card h3::before{background:#75937a}.panel .tutor-form .row{align-items:end;gap:16px}.panel .tutor-form .row label{display:flex;flex:1 1 160px;min-width:0;flex-direction:column;align-items:stretch;gap:6px;font-size:12px;font-weight:500}.panel .tutor-form .row select,.panel .tutor-form .row input{min-width:0;width:100%}.panel .tutor-form>label{margin:18px 0 10px}.panel .tutor-file{flex-wrap:wrap}.panel .tutor-file input{flex:1 1 200px;min-width:0}#tutorHint,#avMessage{display:inline-block;margin:10px;color:#6e7969;font-size:13px;line-height:1.8}
#hwCourseFields{padding:16px 18px;background:#faf5ed;border:1px solid #eee0d1;border-radius:12px;margin-bottom:20px}#hwCourseFields label{display:flex;align-items:center;gap:8px}#hwCourseFields .hint{flex:1 1 280px}
.panel .hw-filters{gap:10px;margin:18px 0;align-items:center}.panel .hw-filters input[type=search]{flex:1 1 200px;max-width:360px}.panel .hw-filters label{color:#6c7868}.panel :is(.hw-task-header,.task-header){background:#f2f4ee;color:#7b8775;border-radius:8px 8px 0 0}.panel :is(.hw-task-row,.task-row,.tutor-task){border-color:var(--ui-line);min-width:0;background:#fff;padding:16px 12px;gap:12px}.panel :is(.hw-task-row,.task-row,.tutor-task)>*{min-width:0;overflow-wrap:anywhere}.panel .hw-task-name{color:#324e3b;font-size:14px}.panel .hw-task-time,.panel .hw-task-stage,.panel .tutor-task small{color:#85907c;font-size:12px;line-height:1.8}.panel .hw-task-actions,.panel .tutor-task>div:last-child{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.panel .hw-task-actions .btn,.panel .tutor-task .btn{min-height:34px;padding:6px 11px;margin:0}.panel .hw-pager{color:#7f8875;flex-wrap:wrap;gap:12px;font-size:12px;padding-top:20px}.panel .hw-empty{padding:34px 14px;color:#939a86}.panel .hw-badge{font-weight:500;font-size:12px}.panel .hw-badge.running{background:#e9f0e7;color:#4a7051}.panel .hw-badge.queued{background:#f9f0db;color:#886c32}
.panel .file-panel,.panel .result-box,.panel .log-box{background:#f7f8f2;border-color:var(--ui-line);border-radius:10px}.panel .fp-title{color:#4b6b50}.panel .file-chip{background:#f0f4eb;border-color:#d9e4d1;color:#58734e}.panel .task-stats{flex-wrap:wrap;gap:12px}.panel .task-stats span{border-color:var(--ui-line);padding:18px 24px}.panel .grade-prog{background:#eee8dc}.panel #hwProgBar{background:#b77c53}
.panel .hw-view-head,.panel .hw-view-main{border-color:var(--ui-line)}.panel .hw-view-main{background:#f6f7f0;gap:20px}.panel .hw-view-main section{box-shadow:none;border:1px solid #e6e9dd}.panel .hw-view-head h2{color:var(--ui-ink)}#tutorViewer{padding-top:20px;border-top:1px solid var(--ui-line);margin-top:12px}#tutorFrame{display:block;max-width:100%;min-height:440px}#aiVideoList{grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr))!important}
.panel details{border-radius:10px}.panel summary{color:#50664d;font-size:13px;line-height:1.8}.panel summary:focus-visible{outline-offset:4px}.panel table,.modal table{max-width:100%}.panel table{display:block;overflow-x:auto;overscroll-behavior-x:contain}.panel table th{background:#f2f4ed;color:#61705b}.panel .log-row{border-color:var(--ui-line);box-shadow:none;border-radius:10px}.panel .log-row:hover{background:#f5f8f1}.panel .lr-time{color:#8a9681}.panel .lr-brief{color:#809075}
.modal-mask{background:#1c322b66;backdrop-filter:blur(4px)}.modal{border-radius:16px;border:1px solid #e2e6da;box-shadow:0 20px 65px #162c2226;background:#fffefa}.modal>h3{padding:19px 22px;border-bottom-color:var(--ui-line);color:#35513c;font-size:17px}.modal>.body{padding:20px 22px;min-width:0;overflow:auto}.modal>.foot{border-top:1px solid var(--ui-line);padding:16px 22px;display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}.modal .info{color:#667c61;line-height:1.8}dialog{border:1px solid var(--ui-line);border-radius:14px;color:var(--ui-ink);max-width:calc(100vw - 24px)}dialog::backdrop{background:#1c322b66}body>footer{color:#969f8c;font-size:11px;padding:16px}
@media(min-width:1100px){#panel-tutor .tutor-form>.row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px 24px}#panel-tutor .tutor-form>.row label{display:flex}.panel .tutor-task{grid-template-columns:minmax(170px,1fr) 84px 140px minmax(240px,.8fr)}}
@media(max-width:950px){.panel .hw-view-main{display:block;padding:14px}.panel .hw-view-main>div{margin-bottom:16px}.panel .hw-task-header{grid-template-columns:minmax(120px,1fr) 90px 140px 130px}.panel .hw-task-row{grid-template-columns:minmax(120px,1fr) 90px 140px 130px}}
@media(max-width:700px){body:not(.portal-visitor)>.header{padding:14px 16px;gap:12px}.header h1{width:100%;font-size:17px}.header .spacer{display:none}.header .user-box{width:100%;justify-content:space-between}.header .user-trigger{font-size:12px}.header .user-box>.btn{font-size:12px}.tabs{padding:14px 16px 10px}.tabs #backHomeBtn{font-size:12px}.panel.active{flex:initial}body>.panel:not(#panel-home){width:calc(100% - 24px);margin:0 12px 20px;padding:16px;border-radius:14px}.panel>h2,.workspace-heading h2{font-size:23px}.panel .grade-hero{padding:20px 16px;align-items:flex-start;gap:12px;margin-bottom:18px}.panel .grade-hero h2{font-size:21px}.panel .grade-hero p{font-size:12px}.panel .grade-hero-icon{width:42px;height:42px;flex-shrink:0}.panel .grade-card,.panel .grade-fold{padding:16px;border-radius:12px}.panel .row{gap:10px;align-items:stretch}.panel .row>input:not([type=checkbox]):not([type=radio]),.panel .row>select{min-width:0!important;max-width:100%;flex:1 1 180px!important}.panel .row label{white-space:normal;overflow-wrap:anywhere}.panel input:not([type=checkbox]):not([type=radio]):not([type=file]):not([type=hidden]),.panel select,.panel textarea,.modal input:not([type=checkbox]):not([type=radio]):not([type=file]):not([type=hidden]),.modal select,.modal textarea{font-size:16px;min-height:44px}.panel .btn,.modal .btn{min-height:40px}.panel .grade-field{flex-direction:column;align-items:stretch;gap:7px}.panel .grade-field input{width:100%;flex:auto}.panel .grade-upload-row>.file-upload,.panel .grade-upload-row>.grade-submit{width:100%}.panel .grade-upload-btn,.panel .grade-answer-btn{width:100%;justify-content:center;min-height:44px}.panel .tutor-form>.row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 12px}.panel .tutor-form>.row label{min-width:0}.panel .tutor-form>.row label:last-child{grid-column:1/-1}.panel .tutor-form .tutor-file{padding:14px;gap:10px}.panel .tutor-file input{flex-basis:100%}.panel #tutorSubmit{width:100%;margin-top:16px}.panel :is(.hw-task-header,.task-header){display:none}.panel .hw-task-row{grid-template-columns:minmax(0,1fr) auto;gap:10px;margin:10px 0;padding:14px}.panel .hw-task-row .hw-task-time{grid-column:1/-1;grid-row:2}.panel .hw-task-row .hw-task-actions{grid-column:1/-1;grid-row:3}.panel .tutor-task{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;border:1px solid var(--ui-line);border-radius:12px;margin:10px 0;padding:14px}.panel .tutor-task>span:nth-child(3){grid-column:1/-1;font-size:12px}.panel .tutor-task>div:last-child{grid-column:1/-1;gap:8px}.panel .hw-filters{align-items:stretch}.panel .hw-filters input[type=search]{max-width:none;width:100%;flex-basis:100%}.panel .hw-filters label{flex:1 1 130px;min-width:0}.panel .hw-filters input[type=date]{width:100%;min-width:0}.panel .hw-pager{justify-content:center}.panel .task-row{grid-template-columns:1fr 1fr}.panel .task-stats span{padding:13px 16px;font-size:13px;flex:1;white-space:nowrap}.panel .hw-subject-cards{grid-template-columns:1fr}.panel .hw-view-head{padding:16px}.panel .hw-view-head h2{font-size:20px}.panel .hw-view-main section{padding:16px}#hwCourseFields{padding:14px;gap:12px}#hwCourseFields label{flex:1 1 100%;min-width:0}#hwCourseFields label select{flex:1;min-width:0}#hwCourseFields .hint{flex-basis:100%}#aiVideoList{grid-template-columns:minmax(0,1fr)!important}#panel-admin{overflow:hidden}#panel-admin table{overflow-x:auto;width:100%}.panel iframe{width:100%!important}.modal{width:calc(100% - 20px);max-height:90dvh}.modal>.body{padding:16px}.modal>.foot{padding:14px 16px}.modal .row>select,.modal .row>input{min-width:0!important;max-width:100%;flex:1 1 140px!important}.modal .row{gap:10px}.panel .log-row{padding:14px}.panel .lr-head{flex-wrap:wrap;gap:6px}.panel .lr-brief{overflow-wrap:anywhere}.panel .result-box{overflow-x:auto}.panel .file-chip{max-width:100%}.panel .file-chip .fc-name{max-width:calc(100vw - 140px)}}
@media(max-width:370px){.panel .tutor-form>.row{grid-template-columns:minmax(0,1fr)}}
@media(prefers-reduced-motion:reduce){.panel *{transition:none!important}}
/* Specific legacy tutor selectors need scoped overrides; warning/error badges stay semantic. */
#panel-tutor .tutor-form .row :is(input,select),#panel-tutor .tutor-form>label>input,#panel-tutor .tutor-form textarea{border-color:#d9e0d5;color:#33473b;font-weight:400}
#panel-tutor .tutor-form :is(input,textarea)::placeholder{color:#979d92}
#panel-tutor .tutor-form p.hint{color:#7b8472;line-height:1.9}
#panel-tutor #tutorSubmit{box-shadow:none}
#panel-tutor .tutor-task{box-shadow:none}#panel-tutor .tutor-task:hover{border-color:#b5c9b0;box-shadow:none;transform:none}
#panel-tutor .tutor-task>div:first-child{color:#344b39}
#panel-tutor .tutor-task>span:not(.hw-badge){color:#55774f;background:#edf3e8;font-weight:500}
#panel-tutor .tutor-task button.btn:not(:only-child),#panel-tutor .tutor-task a.btn{background:#f1f5ec;color:#476743;border-color:#d8e3d1;font-weight:500}
#panel-tutor .tutor-task button.btn:not(:only-child):hover,#panel-tutor .tutor-task a.btn:hover{background:#e6efde;border-color:#b4c9a9;color:#365832}
@media(max-width:700px){#panel-tutor .tutor-form>.row label{width:auto}#panel-tutor .tutor-task>div:last-child{justify-content:flex-start}}
.panel :is(.hint,.info,#hwSelection,.hw-file-row){overflow-wrap:anywhere}.panel .hw-file-row{flex-wrap:wrap}.panel .hw-file-row>*{min-width:0;max-width:100%}
@media(max-width:700px){.panel .hw-filters label{display:flex;align-items:center;flex:1 1 100%;white-space:nowrap}.panel .hw-filters input[type=date]{flex:1;min-width:140px}.panel .hw-filters>select{flex:1 1 160px}}