:root{--lt-bg:#f5f7fb;--lt-card:#fff;--lt-line:#e2e8f0;--lt-text:#172033;--lt-muted:#64748b;--lt-brand:#2563eb;--lt-brand-soft:#eff6ff;--lt-danger:#dc2626;--lt-ok:#059669;--lt-amber:#d97706;--lt-violet:#7c3aed;--lt-ease-spring:cubic-bezier(.32,.9,.35,1.15);--lt-dur-fast:.16s;--lt-dur:.22s;--lt-dur-slow:.28s}
*{box-sizing:border-box}body.learning-body{margin:0;background:linear-gradient(180deg,#f8fafc 0,#f5f7fb 38%,#f7f8fb 100%);color:var(--lt-text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif}.learning-header{position:sticky;top:0;z-index:80;border-bottom:1px solid rgba(226,232,240,.9);background:rgba(255,255,255,.92);backdrop-filter:blur(18px)}.learning-header-inner{max-width:1600px;margin:auto;min-height:64px;padding:8px 20px;display:flex;align-items:center;gap:18px}.brand-block{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--lt-text);min-width:185px}.brand-block b{display:block;font-size:18px}.brand-block small{display:block;color:var(--lt-muted);font-size:10px}.brand-icon{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,#2563eb,#7c3aed);color:white}.learning-main-nav{display:flex;align-items:center;gap:3px;flex:1;justify-content:center;flex-wrap:wrap}.learning-main-nav a{padding:8px 11px;border-radius:10px;color:#475569;text-decoration:none;font-size:12px;font-weight:700}.learning-main-nav a:hover,.learning-main-nav a.active{background:#eef2ff;color:#3730a3}.lt-shell{max-width:1600px;margin:auto;padding:20px}.page-title-row,.section-title{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.page-title-row{margin-bottom:16px}.lt-brand{font-weight:850;font-size:24px;letter-spacing:-.02em}.lt-sub{color:var(--lt-muted);font-size:13px;margin-top:3px}.lt-nav{display:flex;gap:7px;flex-wrap:wrap}.lt-nav a,.lt-nav button,.btn{border:1px solid var(--lt-line);background:#fff;color:var(--lt-text);border-radius:10px;padding:8px 12px;text-decoration:none;cursor:pointer;font-weight:650;font:inherit;font-size:12px;transition:.16s}.lt-nav a:hover,.lt-nav button:hover,.btn:hover{border-color:#cbd5e1;box-shadow:0 3px 10px rgba(15,23,42,.07);transform:translateY(-1px)}.btn.primary{background:var(--lt-brand);border-color:var(--lt-brand);color:#fff}.btn.danger{color:var(--lt-danger);border-color:#fecaca;background:#fff}.btn.success{background:var(--lt-ok);border-color:var(--lt-ok);color:#fff}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.compact-actions label{display:flex;align-items:center;gap:7px}.compact-actions select{width:auto;min-width:150px}.metric-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px;margin-bottom:16px}.metric-card{background:white;border:1px solid var(--lt-line);border-radius:16px;padding:14px;display:flex;align-items:center;gap:12px;box-shadow:0 7px 24px 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8}.span-12{grid-column:span 12}.section-title h3{margin:0;font-size:16px}.section-title p{margin:3px 0 0;color:var(--lt-muted);font-size:12px}.muted{color:var(--lt-muted)}.row{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.stack{display:flex;flex-direction:column;gap:10px}.input,select,textarea{width:100%;border:1px solid var(--lt-line);border-radius:10px;padding:9px 11px;background:#fff;font:inherit;color:inherit;outline:none}.input:focus,select:focus,textarea:focus{border-color:#60a5fa;box-shadow:0 0 0 3px rgba(59,130,246,.08)}textarea{min-height:96px;resize:vertical}label{font-size:12px;font-weight:700;color:#475569}.table-wrap{overflow:auto}.lt-table{width:100%;border-collapse:collapse;min-width:760px}.lt-table th,.lt-table td{padding:10px;border-bottom:1px solid var(--lt-line);text-align:left;vertical-align:top;font-size:12px}.lt-table th{color:#64748b;font-size:11px;position:sticky;top:0;background:#fff;z-index:1}.lt-table tr:hover td{background:#fafcff}.pill{display:inline-flex;align-items:center;border-radius:999px;padding:4px 8px;background:#eef2ff;color:#4338ca;font-size:11px;font-weight:750}.pill.ok{background:#ecfdf5;color:#047857}.pill.warn{background:#fff7ed;color:#c2410c}.pill.danger{background:#fef2f2;color:#b91c1c}.hidden{display:none!important}.message{padding:10px 12px;border-radius:10px;background:#f1f5f9;font-size:12px;line-height:1.55}.message.error{background:#fef2f2;color:#b91c1c}.message.subtle{background:#f8fafc;color:#64748b}.reminder-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:12px}.reminder-card{border:1px solid var(--lt-line);border-radius:13px;padding:12px;background:#fff}.reminder-card.due{border-left:4px solid #f97316}.reminder-card.pending{border-left:4px solid #3b82f6}.reminder-card h4{margin:0 0 5px;font-size:13px}.mastery-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:12px}.mastery-cell{background:#f8fafc;border:1px solid var(--lt-line);border-radius:12px;padding:10px;text-align:center}.mastery-cell b{font-size:20px;display:block}.mastery-cell span{font-size:10px;color:var(--lt-muted)}.class-overview{margin-top:12px;display:flex;flex-direction:column;gap:7px}.class-row{padding:9px 10px;border-radius:11px;background:#fafafa;border:1px solid #edf2f7;font-size:12px}.class-row .weak{color:#7c3aed;margin-top:4px}.health-good{color:#047857}.health-warn{color:#c2410c}.health-danger{color:#b91c1c}.student-link{color:#1d4ed8;text-decoration:none;font-weight:750}.settings-card details{border-bottom:1px solid var(--lt-line);padding:4px 0 10px;margin-bottom:8px}.settings-card summary{cursor:pointer;font-weight:800;font-size:13px;padding:7px 0}.details-body{padding-top:7px}.issue-filter-head{align-items:center}.review-card{padding:18px}.review-title{align-items:center;margin-bottom:12px}.review-source-grid{display:grid;grid-template-columns:minmax(300px,35%) minmax(0,65%);gap:14px}.source-photo-panel,.review-editor-panel,.analysis-edit,.analysis-preview{border:1px solid var(--lt-line);border-radius:15px;background:#fff;overflow:hidden}.source-photo-panel{padding:12px}.review-editor-panel{padding:12px}.panel-head{min-height:34px;display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px;font-weight:800;color:#475569}.panel-head .hint{font-size:10px;color:#f59e0b;font-weight:650}.photo-frame{height:440px;display:grid;place-items:center;border-radius:12px;background:#f8fafc;border:1px solid #edf2f7;overflow:hidden}.preview-img{max-width:100%;max-height:100%;object-fit:contain}.metadata-grid{display:grid;grid-template-columns:2fr .7fr .7fr 1fr 1fr 2fr;gap:8px;margin-bottom:10px}.metadata-grid .wide{grid-column:auto}.editor-preview-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.editor-column,.preview-column{min-width:0}.source-editor{min-height:390px;font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;font-size:13px;line-height:1.7}.rich-preview{min-height:390px;max-height:560px;overflow:auto;border:1px solid var(--lt-line);border-radius:12px;background:#fff;padding:18px;font-size:16px;line-height:1.9}.rich-preview p:first-child{margin-top:0}.rich-preview img,.rendered-question-image{display:block;max-width:100%;max-height:430px;object-fit:contain;margin:14px auto;border-radius:10px}.rich-preview .image-load-error{min-height:100px;border:1px dashed #ef4444}.render-empty{color:#94a3b8;font-style:italic}.illustration-tools{display:flex;align-items:center;justify-content:space-between;gap:10px;border:1px dashed #cbd5e1;background:#f8fafc;border-radius:12px;padding:10px;margin-top:9px}.illustration-tools b{font-size:12px}.illustration-tools p{font-size:10px;color:var(--lt-muted);margin:2px 0 0}.file-btn{display:inline-flex;align-items:center}.image-badges{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.image-badge{padding:5px 8px;border:1px solid #dbeafe;background:#eff6ff;color:#1d4ed8;border-radius:9px;font-size:10px}.analysis-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:14px}.analysis-edit,.analysis-preview{padding:12px}.analysis-preview{background:#fbfdff}.compact-preview{min-height:130px;max-height:300px;font-size:14px}.check-label{display:flex;align-items:center;gap:7px;white-space:nowrap}.check-label input{width:auto}.review-actions{display:flex;justify-content:flex-end;align-items:center;gap:9px;margin-top:14px}.review-actions select{width:auto}.candidate-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:10px}.candidate-card{border:1px solid var(--lt-line);border-radius:13px;padding:12px;background:#fff}.candidate-card .candidate-body{max-height:150px;overflow:hidden;font-size:12px;line-height:1.55}.tabs{display:flex;gap:6px;margin-bottom:12px}.tabs button.active{background:var(--lt-brand);color:#fff}.markdown-preview{line-height:1.8}.markdown-preview img{max-width:100%}.auth-card{width:min(440px,calc(100% - 32px));margin:10vh auto;background:white;border:1px solid var(--lt-line);border-radius:20px;padding:28px;box-shadow:0 24px 60px rgba(15,23,42,.1)}.auth-title{font-size:26px;font-weight:800;margin-bottom:5px}.auth-card form{display:flex;flex-direction:column;gap:14px;margin-top:20px}.assistant-shell{max-width:760px;margin:auto;padding:16px}.capture-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.photo-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.photo-card img{width:100%;height:180px;object-fit:cover;border-radius:12px}.crop-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.88);z-index:999;display:flex;align-items:center;justify-content:center;padding:14px}.crop-dialog{background:#fff;border-radius:16px;width:min(920px,100%);padding:14px}.crop-stage{position:relative;max-height:68vh;overflow:hidden;background:#111;border-radius:10px;touch-action:none}.crop-stage img{display:block;max-width:100%;max-height:68vh;margin:auto;user-select:none}.crop-box{position:absolute;border:2px solid #38bdf8;background:rgba(56,189,248,.08);touch-action:none}.crop-handle{position:absolute;width:22px;height:22px;background:#fff;border:3px solid #0284c7;border-radius:50%}.crop-handle.br{right:-11px;bottom:-11px}.crop-handle.tl{left:-11px;top:-11px}.student-card{border:1px solid var(--lt-line);border-radius:14px;padding:14px;background:#fff}.question-image{max-width:100%;max-height:360px;object-fit:contain;border-radius:10px}.settings-fab{position:fixed;right:18px;bottom:18px;z-index:100;background:#0f172a!important;color:white!important}.modal-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.55);z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px}.modal{background:#fff;border-radius:18px;width:min(820px,100%);max-height:90vh;overflow:auto;padding:20px}.model-pick{display:grid;grid-template-columns:1fr 1fr;gap:8px}
@media(max-width:1250px){.metric-grid{grid-template-columns:repeat(3,1fr)}.metadata-grid{grid-template-columns:2fr .7fr .7fr}.review-source-grid{grid-template-columns:1fr}.photo-frame{height:340px}.candidate-list{grid-template-columns:repeat(2,1fr)}}
@media(max-width:900px){.span-3,.span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 12}.lt-shell{padding:12px}.learning-header-inner{align-items:flex-start;flex-wrap:wrap}.learning-main-nav{order:3;width:100%;overflow:auto;justify-content:flex-start;flex-wrap:nowrap}.metric-grid{grid-template-columns:repeat(2,1fr)}.reminder-list{grid-template-columns:1fr}.mastery-grid{grid-template-columns:repeat(3,1fr)}.editor-preview-grid,.analysis-grid{grid-template-columns:1fr}.metadata-grid{grid-template-columns:1fr 1fr}.source-editor{min-height:280px}.rich-preview{min-height:280px}.candidate-list{grid-template-columns:1fr}.photo-list{grid-template-columns:1fr}.capture-actions{grid-template-columns:1fr 1fr}.model-pick{grid-template-columns:1fr}.page-title-row{flex-direction:column}}
@media(max-width:560px){.metric-grid{grid-template-columns:1fr 1fr}.metric-card{padding:10px}.metric-card strong{font-size:22px}.learning-header-inner{padding:8px 10px}.brand-block{min-width:auto}.learning-main-nav{display:none}.lt-nav{width:100%}.metadata-grid{grid-template-columns:1fr}.illustration-tools{align-items:flex-start;flex-direction:column}.review-actions{justify-content:stretch;flex-wrap:wrap}.review-actions .btn,.review-actions select{flex:1}.capture-actions{grid-template-columns:1fr}}

/* Student / guardian mobile portal */
.student-mobile-body{background:#f4f7fb;padding-bottom:92px;color:#152238}.student-mobile-header{position:sticky;top:0;z-index:30;display:flex;justify-content:space-between;align-items:center;padding:12px max(14px,env(safe-area-inset-left));background:rgba(255,255,255,.94);backdrop-filter:blur(16px);border-bottom:1px solid #e5ebf3}.student-mobile-brand{font-size:20px;font-weight:800;letter-spacing:-.02em}.student-mobile-brand span{font-size:13px;font-weight:600;color:#718096;margin-left:6px}.student-mobile-sub{font-size:12px;color:#7a8798;margin-top:3px}.icon-btn{width:40px;height:40px;border-radius:12px;border:1px solid #e2e8f0;background:#fff;color:#536176}.student-mobile-main{width:min(820px,100%);margin:0 auto;padding:14px 14px 24px}.student-hero{display:flex;justify-content:space-between;align-items:center;gap:16px;background:linear-gradient(135deg,#eef5ff,#f8fbff);border:1px solid #dfe9f7;border-radius:22px;padding:20px;margin-bottom:12px}.student-hero small{color:#6681a3}.student-hero h1{font-size:24px;margin:4px 0}.student-hero p{margin:0;color:#607086}.student-streak{min-width:92px;height:92px;border-radius:24px;background:#fff;box-shadow:0 8px 24px rgba(41,78,127,.08);display:flex;flex-direction:column;align-items:center;justify-content:center;color:#356ee6}.student-streak b{font-size:28px;line-height:1}.student-streak small{font-size:11px;margin-top:4px}.student-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:12px}.student-metrics>div{background:#fff;border:1px solid #e6edf5;border-radius:16px;padding:12px 8px;text-align:center}.student-metrics b{display:block;font-size:22px}.student-metrics span{font-size:11px;color:#7b8795}.student-section{background:#fff;border:1px solid #e4eaf2;border-radius:18px;padding:16px;margin:12px 0}.student-section h3{margin:0 0 6px}.student-section .section-title{margin-bottom:10px}.student-section .section-title h3{font-size:17px}.student-section .section-title p{font-size:12px}.student-reminders{display:grid;gap:8px}.ai-summary-card{background:linear-gradient(180deg,#fff,#fbfaff)}.student-summary-content{font-size:15px;line-height:1.75}.student-summary-content h3{font-size:15px;margin:12px 0 4px}.knowledge-chip-list{display:flex;gap:8px;flex-wrap:wrap}.knowledge-chip-list span{background:#f2f6fb;border:1px solid #e3eaf3;border-radius:999px;padding:7px 10px;font-size:13px}.knowledge-chip-list b{color:#3c6ed8;margin-left:3px}.student-timeline{display:grid;gap:0}.timeline-row{display:grid;grid-template-columns:16px 1fr auto;gap:8px;align-items:start;padding:10px 0;border-bottom:1px solid #edf1f5}.timeline-row:last-child{border-bottom:0}.timeline-dot{width:9px;height:9px;border-radius:50%;background:#7aa4ff;margin-top:5px;box-shadow:0 0 0 4px #edf4ff}.timeline-row b{display:block;font-size:14px}.timeline-row small{display:block;color:#8090a3;margin-top:3px}.student-page-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:4px 2px 12px}.student-page-head h2{font-size:22px;margin:0}.student-page-head p{color:#77869a;margin:4px 0 0;font-size:13px}.subject-filter{display:flex;gap:8px;overflow-x:auto;padding:2px 0 10px}.subject-filter button{white-space:nowrap;border:1px solid #dbe4ef;background:#fff;border-radius:999px;padding:7px 13px;color:#66758a}.subject-filter button.active{background:#2f6feb;color:#fff;border-color:#2f6feb}.student-subtabs{margin-bottom:10px}.portal-question-card{border-radius:18px;box-shadow:none}.portal-question-content{font-size:16px;line-height:1.8}.portal-question-meta{display:flex;gap:8px 14px;flex-wrap:wrap;color:#748398;font-size:12px;margin:8px 0 12px}.student-edit-actions{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}.visual-edit-box{margin-top:10px;padding:12px;background:#f8fafc;border:1px solid #e3eaf3;border-radius:14px}.visual-edit-hint{font-size:12px;color:#718096;margin-bottom:8px}.visual-edit-surface{min-height:120px;background:#fff;border:1px solid #d8e2ee;border-radius:12px;padding:12px;white-space:pre-wrap;line-height:1.7;outline:none}.visual-edit-surface:focus{border-color:#75a0ef;box-shadow:0 0 0 3px rgba(57,111,229,.10)}.visual-edit-box textarea{margin:8px 0;min-height:64px}.student-answer-panel{margin-top:10px;padding:12px;background:#fbfcfe;border-radius:14px;border:1px solid #e8edf3;display:grid;gap:10px}.quota-banner{background:#edf6ff;color:#42648d;border:1px solid #d5e8fb;border-radius:14px;padding:10px 12px;margin-bottom:12px;font-size:13px}.student-capture-card{background:#fff;border:1px solid #e3eaf2;border-radius:20px;padding:16px}.student-record-types{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px}.student-record-types button{border:1px solid #dfe6ef;background:#fff;border-radius:15px;padding:12px;display:flex;align-items:center;justify-content:center;gap:8px;font-weight:700}.student-record-types button.active{border-color:#7ea5ef;background:#eef5ff;color:#2e67d4}.student-capture-actions{grid-template-columns:1fr 1fr}.capture-big{min-height:128px;border:1.5px dashed #cbd8e8;background:#f9fbfe;border-radius:18px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px}.capture-big.camera{background:#eef5ff;border-color:#9bb9ed;color:#2f68d8}.capture-big i{font-size:28px}.capture-big b{font-size:16px}.capture-big small{font-size:11px;color:#7b8b9e}.wide-action{width:100%;margin-top:12px;padding:13px}.policy-detail{display:grid;gap:0}.policy-row{display:flex;justify-content:space-between;gap:10px;padding:11px 0;border-bottom:1px solid #edf1f5}.policy-row:last-child{border-bottom:0}.student-bottom-nav{position:fixed;z-index:40;left:0;right:0;bottom:0;height:76px;padding:6px max(10px,env(safe-area-inset-right)) max(6px,env(safe-area-inset-bottom));background:rgba(255,255,255,.97);border-top:1px solid #dfe6ef;display:grid;grid-template-columns:repeat(5,1fr);box-shadow:0 -8px 30px rgba(30,50,80,.06)}.student-bottom-nav button{border:0;background:none;color:#7a8797;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;font-size:11px}.student-bottom-nav button i{font-size:19px}.student-bottom-nav button.active{color:#2e6be6}.capture-nav{position:relative}.capture-circle{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;background:#2f6feb;color:#fff;margin-top:-25px;border:5px solid #fff;box-shadow:0 7px 18px rgba(47,111,235,.28)}.capture-nav .capture-circle i{font-size:20px}.capture-nav>span:last-child{margin-top:-2px}.student-mobile-main .photo-card img{max-height:240px;object-fit:contain}
@media(max-width:560px){.student-mobile-main{padding:10px 10px 20px}.student-hero{padding:16px}.student-hero h1{font-size:21px}.student-streak{min-width:78px;height:78px;border-radius:20px}.student-metrics{gap:6px}.student-metrics>div{padding:10px 4px}.student-metrics b{font-size:19px}.student-section{padding:13px}.student-page-head .btn{font-size:12px;padding:8px}.student-capture-actions{grid-template-columns:1fr 1fr}.capture-big{min-height:112px}}
.summary-snippet{max-width:260px;font-size:12px;color:#65758a;line-height:1.45;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.btn.mini{padding:5px 8px;font-size:11px;margin-top:5px}.student-correction-preview{white-space:pre-wrap;line-height:1.65;margin:8px 0;padding:10px;background:#fff;border-radius:10px;border:1px solid #e4e9f0}.compact{gap:5px}

/* RC4 教师学情工作台：目录导航、紧凑复核、推荐练习工作流 */
.lt-page-layout{display:grid;grid-template-columns:190px minmax(0,1fr);gap:18px;align-items:start}
.lt-page-content{min-width:0}
.lt-toc{position:sticky;top:82px;align-self:start;background:rgba(255,255,255,.92);border:1px solid var(--lt-line);border-radius:16px;padding:12px;box-shadow:0 8px 24px rgba(15,23,42,.045);max-height:calc(100vh - 100px);overflow:auto}
.lt-toc b{display:block;font-size:12px;margin:2px 6px 8px;color:#334155}.lt-toc nav{display:grid;gap:4px}.lt-toc a{display:flex;align-items:center;gap:8px;text-decoration:none;color:#64748b;font-size:12px;font-weight:700;padding:8px 9px;border-radius:9px}.lt-toc a:hover{background:#eff6ff;color:#1d4ed8}.lt-toc i{width:15px;text-align:center}
.metric-action{font:inherit;text-align:left;cursor:pointer;width:100%;color:inherit}.metric-action:hover{border-color:#bfdbfe;box-shadow:0 8px 24px rgba(37,99,235,.09)}
.collapsible-card{padding:0;overflow:hidden;margin-bottom:16px}.collapse-head{width:100%;border:0;background:#fff;padding:14px 16px;display:flex;align-items:center;gap:12px;cursor:pointer;color:var(--lt-text);text-align:left}.collapse-head>span:first-child{display:grid;gap:2px;flex:1}.collapse-head b{font-size:14px}.collapse-head small{font-size:11px;color:var(--lt-muted);font-weight:500}.collapse-head>span:nth-child(2){font-size:11px;color:#64748b}.collapse-head i{transition:transform .18s}.collapse-body{padding:0 16px 16px;max-height:1000px;opacity:1;transition:max-height .24s ease,opacity .18s ease,padding .24s ease}.collapsible-card.collapsed .collapse-body{max-height:0;opacity:0;padding-top:0;padding-bottom:0;overflow:hidden}.collapsible-card.collapsed .collapse-head i{transform:rotate(-90deg)}
.compact-photo-frame{height:260px}.review-source-grid{grid-template-columns:minmax(240px,28%) minmax(0,72%)}.review-card{padding:14px}.review-editor-panel,.source-photo-panel{padding:10px}.metadata-grid{grid-template-columns:2fr .65fr .65fr .8fr .9fr 1.5fr;margin-bottom:8px}.source-editor.compact-source-editor{min-height:190px;max-height:360px;line-height:1.55;font-size:12.5px}.short-textarea{min-height:72px;max-height:150px}.medium-textarea{min-height:100px;max-height:230px}.analysis-grid{gap:10px;margin-top:10px}.analysis-edit,.analysis-preview{padding:10px}.analysis-edit .row{gap:7px}.no-scroll-preview{max-height:none!important;overflow:visible!important;min-height:80px}.review-question-preview{min-height:220px;padding:14px;font-size:14px;line-height:1.65}.review-question-preview img{max-height:270px;margin:9px auto}.compact-preview{min-height:86px;padding:12px;font-size:13px;line-height:1.62}.compact-preview img{max-height:220px}.illustration-tools{padding:8px;margin-top:7px}.review-actions{position:sticky;bottom:8px;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border:1px solid #e2e8f0;border-radius:13px;padding:8px 10px;z-index:15;box-shadow:0 8px 24px rgba(15,23,42,.08)}
.model-purpose{border:1px solid #edf2f7;border-radius:12px;padding:10px;background:#fbfdff}.model-purpose>b{display:block;margin-bottom:7px}.model-control-row{display:grid;grid-template-columns:minmax(105px,.8fr) minmax(150px,1.25fr) minmax(160px,1.4fr);gap:7px;align-items:end}.model-control-row label{min-width:0}.model-control-row select,.model-control-row input{margin-top:4px}
.recommendation-workbench>.lt-grid{align-items:start}.recommend-context-panel,.recommend-search-panel,.recommend-basket-panel{min-width:0}.knowledge-chip-list{display:flex;gap:7px;flex-wrap:wrap;margin:9px 0}.knowledge-chip{border:1px solid #dbe3ee;background:#fff;border-radius:12px;padding:8px 10px;display:grid;gap:2px;text-align:left;cursor:pointer}.knowledge-chip b{font-size:12px}.knowledge-chip span{font-size:10px;color:#64748b}.knowledge-chip:hover,.knowledge-chip.active{border-color:#93b4f5;background:#eff6ff;color:#1d4ed8}.knowledge-preview{display:grid;gap:8px;margin-bottom:12px}.mini-issue-card{border:1px solid #e6ebf2;border-radius:12px;padding:9px;background:#fff}.mini-question-render{font-size:12px;line-height:1.55;margin-top:7px;max-height:150px;overflow:hidden}.mini-question-render img{max-height:100px;max-width:100%;object-fit:contain}.keyword-plan-list{display:grid;gap:6px;margin-top:9px}.keyword-plan-item{display:flex;align-items:center;justify-content:space-between;gap:10px;border:1px solid #e1e8f0;border-radius:10px;padding:8px 9px;background:#fff}.keyword-plan-item>div:first-child{display:grid;gap:2px}.keyword-plan-item b{font-size:12px;color:#1e40af}.keyword-plan-item span{font-size:10px;color:#64748b}.recommend-filter-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:10px 0;padding:9px 10px;border-radius:12px;background:#f8fafc;border:1px solid #edf2f7}.keyword-search-results{display:grid;gap:14px}.keyword-result-group{border-top:1px solid #e8edf4;padding-top:10px}.keyword-result-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.keyword-result-head h4{margin:0;font-size:14px}.keyword-result-head span{font-size:11px;color:#64748b}.rich-candidate{padding:10px;min-width:0}.candidate-top{display:flex;justify-content:space-between;gap:8px;align-items:flex-start}.candidate-render{font-size:12px;line-height:1.55;margin:8px 0;max-height:220px;overflow:hidden}.candidate-render img{display:block;max-width:100%;max-height:140px;object-fit:contain;margin:6px auto}.candidate-meta{font-size:10px;color:#64748b}.difficulty-basic{background:#ecfdf5;color:#047857}.difficulty-easy_error{background:#fff7ed;color:#c2410c}.difficulty-challenge{background:#f5f3ff;color:#6d28d9}.difficulty-qiangji{background:#fef2f2;color:#b91c1c}
.practice-basket{display:grid;gap:8px}.basket-item{display:grid;grid-template-columns:30px minmax(0,1fr) auto;gap:10px;border:1px solid #e1e8f0;border-radius:12px;padding:9px;background:#fff;align-items:start}.basket-index{width:26px;height:26px;border-radius:8px;background:#eff6ff;color:#1d4ed8;display:grid;place-items:center;font-weight:800;font-size:11px}.basket-main{min-width:0}.basket-render{font-size:12px;line-height:1.5;margin-top:6px;max-height:160px;overflow:hidden}.basket-render img{max-width:100%;max-height:110px;object-fit:contain}.basket-actions{display:flex;gap:4px;flex-direction:column}
.rich-preview pre code{white-space:pre-wrap}.rich-preview .katex-display{overflow-x:auto;overflow-y:hidden;padding:2px 0}.rich-preview p{margin:.45em 0}.rich-preview ol,.rich-preview ul{margin:.4em 0;padding-left:1.5em}
@media(max-width:1180px){.lt-page-layout{grid-template-columns:1fr}.lt-toc{position:sticky;top:64px;z-index:30;display:flex;align-items:center;overflow-x:auto;max-height:none;padding:7px 9px}.lt-toc b{display:none}.lt-toc nav{display:flex;min-width:max-content}.lt-toc a{padding:7px 9px}.review-source-grid{grid-template-columns:1fr}.compact-photo-frame{height:220px}.editor-preview-grid{grid-template-columns:1fr}.model-control-row{grid-template-columns:1fr 1fr}.model-control-row label:last-child{grid-column:1/-1}}
@media(max-width:760px){.lt-shell{padding:10px}.metric-grid{grid-template-columns:repeat(2,1fr)}.dashboard-grid,.work-grid{display:block}.dashboard-grid>.card,.work-grid>.card{margin-bottom:10px}.model-control-row{grid-template-columns:1fr}.model-control-row label:last-child{grid-column:auto}.metadata-grid{grid-template-columns:1fr 1fr}.metadata-grid .wide{grid-column:1/-1}.reminder-list{grid-template-columns:1fr}.candidate-list{grid-template-columns:1fr}.basket-item{grid-template-columns:26px minmax(0,1fr)}.basket-actions{grid-column:2;flex-direction:row}.review-actions{flex-wrap:wrap;justify-content:flex-start}}
.toc-title{font-size:12px;font-weight:850;color:#334155;margin:2px 7px 8px}.toc-note{font-size:10px;line-height:1.5;color:#94a3b8;border-top:1px solid #eef2f7;margin-top:8px;padding:8px 7px 2px}.recommend-top-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:14px;margin-top:12px}.ai-plan-panel{border-left:1px solid #edf2f7;padding-left:14px}.shared-settings-modal{width:min(1160px,100%)}.shared-settings-modal .model-purpose{background:#fbfdff}.learning-model-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.api-secret-pane{border-right:1px solid #edf2f7;padding-right:12px}
@media(max-width:980px){.recommend-top-grid,.learning-model-grid{grid-template-columns:1fr}.ai-plan-panel{border-left:0;border-top:1px solid #edf2f7;padding-left:0;padding-top:12px}.api-secret-pane{border-right:0;padding-right:0}}
.lt-toc a.active{background:#eaf2ff;color:#1d4ed8;box-shadow:inset 3px 0 #3b82f6}

/* RC4.1 模型连接测试：结果就地显示在对应按钮旁，互不覆盖 */
.model-test-row{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:6px;min-height:28px}
.model-test-row .btn.mini{margin-top:0;flex:0 0 auto}
.model-test-result{font-size:11px;line-height:1.45;color:#64748b;min-width:0;overflow-wrap:anywhere}
.model-test-result.loading{color:#64748b}
.model-test-result.success{color:#047857;font-weight:700}
.model-test-result.error{color:#b91c1c;font-weight:650}

/* RC4.2: 学情跟踪页复用 MathBank 公共关闭题库逻辑。
   common_nav.js 的遮罩原本使用 Tailwind utility classes；本页不加载 Tailwind，
   因此提供轻量 fallback，确保关闭提示在学情页也正常显示。 */
.learning-shutdown-btn{display:inline-flex;align-items:center;gap:6px;color:#b91c1c!important;border-color:#fecaca!important;background:#fff!important}
.learning-shutdown-btn:hover{background:#fef2f2!important;border-color:#fca5a5!important}
#shutdownOverlay{position:fixed!important;inset:0!important;z-index:9999!important;display:flex!important;align-items:center!important;justify-content:center!important;background:rgba(15,23,42,.96)!important;color:#fff!important;backdrop-filter:blur(10px);transition:opacity .35s ease;opacity:1}
#shutdownOverlay.opacity-0{opacity:0}
#shutdownOverlay>div{width:min(440px,calc(100% - 32px));padding:32px;text-align:center}
#shutdownOverlay h2{margin:14px 0 8px;font-size:22px;color:#fff}
#shutdownOverlay p{color:#cbd5e1;line-height:1.7}
#shutdownOverlay code{display:inline-block;padding:2px 6px;border-radius:6px;background:#1e293b;color:#fca5a5}
#shutdownOverlay .fa-power-off{font-size:32px;color:#f87171}

/* ===== Teacher workbench navigation v5 ===== */
.workspace-hidden{display:none!important}
.lt-workspace-nav{display:flex;flex-direction:column;gap:6px;align-self:start;position:sticky;top:96px}
.workspace-nav-item{appearance:none;border:0;background:transparent;color:var(--lt-ink,#17324D);display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;border-radius:12px;font:inherit;font-weight:650;cursor:pointer;text-align:left;transition:background .18s ease,box-shadow .18s ease,transform .18s ease}
.workspace-nav-item i{width:18px;text-align:center;color:#6b7f93}
.workspace-nav-item:hover{background:#f2f6fb;transform:translateX(1px)}
.workspace-nav-item.active{background:#e9f2fb;box-shadow:inset 3px 0 0 #2b6ea6;color:#17324d}
.workspace-nav-item.active i{color:#2b6ea6}
.class-workbench{min-height:520px}
.class-student-table .student-name-button,.student-name-button{border:0;background:none;padding:0;color:#17324d;font:inherit;font-weight:750;cursor:pointer;text-align:left}
.class-student-table .student-name-button:hover,.student-name-button:hover{color:#2b6ea6;text-decoration:underline}
.class-student-table tr.priority-high td:first-child{box-shadow:inset 3px 0 0 #be4b4b}
.class-student-table tr.priority-mid td:first-child{box-shadow:inset 3px 0 0 #b7791f}
.class-student-table tr.priority-low td:first-child{box-shadow:inset 3px 0 0 #1f8a70}
.student-profile-selectors{display:grid;grid-template-columns:minmax(180px,260px) minmax(220px,360px) auto;gap:12px;align-items:end;margin:8px 0 16px;padding:14px;border:1px solid #d8e2ee;border-radius:16px;background:#f8fafc}
.student-profile-selectors label{display:grid;gap:6px;font-size:12px;color:#60758a;font-weight:650}
.student-profile-selectors select{min-height:42px;border:1px solid #d8e2ee;border-radius:12px;background:#fff;padding:0 12px;color:#17324d}
.saturday-workbench{min-height:560px}
.saturday-metrics{margin:4px 0 18px}
.saturday-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(300px,.75fr);gap:16px;align-items:start}
.saturday-grid h4,.saturday-ai-panel h4{margin:0 0 8px;color:#17324d}
.saturday-topic-list,.saturday-student-list{display:grid;gap:10px}
.saturday-topic-card,.saturday-student-card{border:1px solid #d8e2ee;border-radius:14px;background:#fff;padding:12px 14px}
.saturday-topic-card>.row{justify-content:space-between;align-items:flex-start}
.topic-rank{display:inline-grid;place-items:center;min-width:26px;height:26px;border-radius:9px;background:#e9f2fb;color:#2b6ea6;font-weight:800}
.saturday-student-card{display:grid;grid-template-columns:minmax(90px,1fr) auto;gap:6px 12px;align-items:center}
.saturday-student-card small{grid-column:1/-1;color:#718499}
.saturday-ai-panel{margin-top:18px;padding-top:18px;border-top:1px solid #e3ebf4}
.row.wrap{flex-wrap:wrap}

@media (max-width:1050px){
  .lt-workspace-nav{display:flex;flex-direction:row;overflow-x:auto;gap:8px;padding:8px 0}
  .workspace-nav-item{width:auto;white-space:nowrap;padding:9px 12px;box-shadow:none!important}
  .workspace-nav-item.active{box-shadow:inset 0 -3px 0 #2b6ea6!important}
  .saturday-grid{grid-template-columns:1fr}
}
@media (max-width:720px){
  .student-profile-selectors{grid-template-columns:1fr}
  .saturday-student-card{grid-template-columns:1fr}
}
/* 窄屏：大头部随页面滚走（不再 sticky 遮挡），主导航链接保持单行不竖排 */
@media(max-width:900px){
  .learning-header{position:relative}
  .learning-main-nav a{flex:0 0 auto;white-space:nowrap}
}
.review-field-head{gap:10px}.review-inline-tools{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.review-field-block{display:grid;gap:5px}.inline-ocr-preview{display:grid;gap:4px;margin-top:4px}.inline-ocr-preview span,.inline-status{font-size:11px;color:var(--lt-muted)}
@media(max-width:760px){.review-field-head{align-items:flex-start;flex-direction:column}.review-inline-tools{width:100%}}