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.edu-dialog-title{color:var(--white)}.demo-gate-dialog .edu-dialog-body{color:var(--white-dim)}.demo-gate-close{position:absolute;top:10px;right:12px;background:transparent;border:none;color:var(--edu-text-dim, var(--white-dim));font-size:20px;line-height:1;cursor:pointer;padding:4px}.demo-gate-close:hover{color:var(--edu-text, var(--white))}.demo-gate-actions{justify-content:flex-start}.demo-entry-message{margin:8px 0 0;text-align:center;color:var(--white-dim);font-size:14px;line-height:1.5}.paywall-content{text-align:center;padding:8px 0}.paywall-title{font-size:20px;font-weight:600;color:#e5e7eb;margin:0 0 8px}.paywall-description{color:#94a3b8;font-size:14px;margin:0 0 20px;line-height:1.5}.paywall-price-card{background:#1e293bcc;border:1px solid rgba(148,163,184,.2);border-radius:12px;padding:20px;margin-bottom:20px}.paywall-price{margin-bottom:16px}.paywall-amount{font-size:36px;font-weight:700;color:#e5e7eb}.paywall-period{font-size:16px;color:#94a3b8}.paywall-features{list-style:none;padding:0;margin:0;text-align:left}.paywall-features li{padding:6px 0;color:#94a3b8;font-size:14px}.paywall-features li:before{content:"✓";color:#34d399;margin-right:8px}.paywall-logout{margin-top:12px;padding:8px 16px;border:none;background:transparent;color:#64748b;font-size:13px;cursor:pointer}.paywall-logout:hover{color:#94a3b8}.paywall-secondary{display:block;width:100%;margin-top:10px;padding:10px 16px;border:1px solid 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svg{display:block}.settings-menu-item--logout{margin-top:6px;padding-top:12px;border-top:1px solid rgba(148,163,184,.15);border-radius:0 0 8px 8px;color:#94a3b8}.settings-menu-item--logout:hover{background:#ef44441a;color:#fca5a5}.settings-menu-item--logout:hover .settings-menu-icon{color:#fca5a5}.settings-screen{width:100%;max-width:1024px;height:90vh;display:flex;background:#0f1929f7;border-radius:18px;border:1px solid rgba(148,163,184,.3);overflow:hidden;box-shadow:0 24px 60px #0f1929e6}.settings-sidebar{width:240px;flex-shrink:0;background:#0003;border-right:1px solid rgba(148,163,184,.2);display:flex;flex-direction:column;overflow-y:auto}.settings-sidebar-header{display:flex;align-items:center;gap:10px;padding:16px 18px;border-bottom:1px solid rgba(148,163,184,.15)}.settings-sidebar-header h1{margin:0;font-size:16px;font-weight:600;color:#e5e7eb;letter-spacing:.02em}.settings-back-btn{background:none;border:1px solid rgba(148,163,184,.3);border-radius:8px;color:#94a3b8;font-size:14px;width:28px;height:28px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s}.settings-back-btn:hover{background:#94a3b81a;color:#e5e7eb;border-color:#88c5ab}.settings-nav{display:flex;flex-direction:column;padding:10px 8px;gap:2px}.settings-nav-item{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;background:transparent;border:none;border-radius:8px;color:#cbd5e1;font-size:13px;cursor:pointer;text-align:left;transition:all .1s;font-family:inherit}.settings-nav-item:hover{background:#88c5ab1a;color:#e5e7eb}.settings-nav-item--active{background:#88c5ab2e;color:#88c5ab;font-weight:600}.settings-nav-item--logout{margin-top:auto;padding-top:12px;border-top:1px solid rgba(148,163,184,.15);border-radius:0 0 8px 8px;color:#94a3b8}.settings-nav-item--logout:hover{background:#ef44441a;color:#fca5a5}.settings-nav-item--logout:hover .settings-nav-icon{color:#fca5a5}.settings-nav{flex:1;min-height:0}.settings-nav-icon{width:20px;height:20px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;color:#94a3b8;transition:color .1s}.settings-nav-item:hover .settings-nav-icon,.settings-nav-item--active .settings-nav-icon{color:currentColor}.settings-nav-icon svg{display:block}.settings-content{flex:1;overflow-y:auto;padding:24px 28px 48px}.settings-section{max-width:640px;margin:0 auto;position:relative}.settings-section h2{margin:0 0 20px;font-size:22px;color:#e5e7eb;letter-spacing:.01em}.settings-section h3{margin:0 0 8px;font-size:14px;color:#cbd5e1;letter-spacing:.02em}.settings-card{padding:18px 20px;border:1px solid rgba(148,163,184,.2);border-radius:12px;background:#00000026;margin-bottom:14px}.settings-card--danger{border-color:#ef444459;background:#ef44440a}.settings-card--danger h3{color:#fca5a5}.settings-meta{font-size:13px;color:#94a3b8;margin:6px 0;line-height:1.5}.settings-meta--hint{font-size:12px;color:#64748b}.settings-form{display:flex;flex-direction:column;gap:12px}.settings-field{display:flex;flex-direction:column;gap:6px;margin-top:10px}.settings-field label{font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:.06em;color:#ffffff73}.settings-field input[type=text],.settings-field input[type=email],.settings-field input[type=password],.settings-field input[type=time],.settings-field select,.settings-field textarea{width:100%;background:#0f192999;border:1px solid rgba(148,163,184,.25);border-radius:10px;padding:10px 12px;font-size:14px;color:#e5e7eb;outline:none;transition:border-color .15s,box-shadow .15s;font-family:inherit}.settings-field textarea{resize:vertical;min-height:90px}.settings-field input:focus,.settings-field select:focus,.settings-field textarea:focus{border-color:#88c5ab;box-shadow:0 0 0 3px #88c5ab26}.settings-row-between{display:flex;align-items:center;justify-content:space-between;gap:16px}.settings-row-between+.settings-row-between{margin-top:16px;padding-top:16px;border-top:1px solid rgba(148,163,184,.15)}.settings-inline-row{display:flex;gap:8px}.settings-inline-row input{flex:1;background:#0f192999;border:1px solid rgba(148,163,184,.25);border-radius:10px;padding:10px 12px;font-size:14px;color:#e5e7eb;outline:none;font-family:inherit}.settings-inline-row input:focus{border-color:#88c5ab;box-shadow:0 0 0 3px #88c5ab26}.settings-inline-actions{display:flex;gap:8px;flex-wrap:wrap}.settings-btn-primary,.settings-btn-ghost,.settings-btn-danger{padding:9px 16px;border-radius:10px;font-size:13px;font-weight:500;cursor:pointer;transition:all .15s;font-family:inherit;white-space:nowrap}.settings-btn-primary{background:#88c5ab;color:#1a1a1a;border:1px solid #88C5AB}.settings-btn-primary:hover:not(:disabled){background:#78b89e}.settings-btn-primary:disabled{opacity:.5;cursor:not-allowed}.settings-btn-ghost{background:transparent;color:#cbd5e1;border:1px solid rgba(148,163,184,.3)}.settings-btn-ghost:hover:not(:disabled){background:#94a3b81a;border-color:#88c5ab;color:#e5e7eb}.settings-btn-ghost:disabled{opacity:.5;cursor:not-allowed}.settings-btn-danger{background:transparent;color:#fca5a5;border:1px solid rgba(239,68,68,.45)}.settings-btn-danger:hover:not(:disabled){background:#ef44441f;border-color:#ef4444;color:#fca5a5}.settings-btn-danger:disabled{opacity:.5;cursor:not-allowed}.settings-radio-row{display:flex;flex-wrap:wrap;gap:8px}.settings-radio{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border:1px solid rgba(148,163,184,.25);border-radius:999px;cursor:pointer;background:#0f192999;color:#cbd5e1;font-size:13px;transition:all .15s}.settings-radio:hover{border-color:#88c5ab;color:#e5e7eb}.settings-radio input{accent-color:#88C5AB}.settings-radio-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:8px}.settings-subgroup{margin-top:12px}.settings-subgroup h4{margin:0 0 6px;text-transform:uppercase;letter-spacing:.04em}.settings-radio-card{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;border:1px solid rgba(148,163,184,.25);border-radius:10px;cursor:pointer;background:#0f192999;transition:all .15s}.settings-radio-card:hover{border-color:#88c5ab}.settings-radio-card input{margin-top:3px;accent-color:#88C5AB}.settings-radio-card strong{color:#e5e7eb;font-size:13px;display:block;margin-bottom:2px}.settings-chip-grid{display:flex;flex-wrap:wrap;gap:6px}.settings-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:#0f1929b3;border:1px solid rgba(148,163,184,.25);border-radius:999px;font-size:12px;color:#cbd5e1;cursor:pointer;transition:all .15s;font-family:inherit}.settings-chip:hover{border-color:#88c5ab;color:#e5e7eb}.settings-chip--active{background:#88c5ab2e;border-color:#88c5ab;color:#88c5ab;font-weight:600}.settings-chip--tag{cursor:default;background:#88c5ab1f;border-color:#88c5ab4d;color:#e5e7eb}.settings-chip--tag button{background:none;border:none;color:#94a3b8;cursor:pointer;font-size:14px;padding:0;line-height:1}.settings-chip--tag button:hover{color:#fca5a5}.settings-avatar-row{display:flex;align-items:center;gap:16px;margin-bottom:12px}.settings-avatar{width:64px;height:64px;border-radius:999px;background:#88c5ab26;border:1px solid rgba(148,163,184,.3);display:flex;align-items:center;justify-content:center;overflow:hidden;flex-shrink:0;color:#88c5ab;font-size:22px;font-weight:600}.settings-avatar img{width:100%;height:100%;object-fit:cover}.settings-avatar-controls{display:flex;flex-direction:column;gap:6px;align-items:flex-start}.settings-toggle{position:relative;width:44px;height:24px;border-radius:999px;background:#94a3b84d;border:none;cursor:pointer;transition:background .15s;padding:0;flex-shrink:0}.settings-toggle--on{background:#88c5ab}.settings-toggle-thumb{position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:999px;background:#fff;transition:transform .15s;box-shadow:0 1px 3px #0000004d}.settings-toggle--on .settings-toggle-thumb{transform:translate(20px)}.settings-slider-row{display:flex;align-items:center;gap:10px}.settings-slider-row input[type=range]{flex:1;accent-color:#88C5AB}.settings-progress-track{height:8px;background:#94a3b82e;border-radius:999px;overflow:hidden;margin-top:8px}.settings-progress-fill{height:100%;background:linear-gradient(90deg,#88c5ab,#60a5fa);border-radius:999px;transition:width .3s}.settings-plan-label{font-size:18px;font-weight:600;color:#e5e7eb;margin:0 0 6px}.settings-usage-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.settings-usage-stat{padding:14px 12px;border:1px solid rgba(148,163,184,.15);border-radius:10px;background:#0003;text-align:center}.settings-usage-value{font-size:22px;font-weight:700;color:#88c5ab}.settings-usage-label{font-size:11px;color:#94a3b8;margin-top:4px}.settings-sticky-save{display:flex;justify-content:flex-end;padding-top:8px}.settings-link-list{list-style:none;padding:0;margin:8px 0 0;display:flex;flex-direction:column;gap:6px}.settings-link-list a{color:#88c5ab;font-size:13px;text-decoration:none;border-bottom:1px solid transparent;padding-bottom:1px;transition:border-color .15s}.settings-link-list a:hover{border-color:#88c5ab}.settings-bullet-list{margin:8px 0;padding-left:20px;color:#cbd5e1;font-size:13px;line-height:1.6}.settings-toast{position:sticky;top:0;z-index:5;padding:10px 14px;border-radius:10px;font-size:13px;margin-bottom:12px;animation:fadeInUp .2s ease-out}.settings-toast--success{background:#22c55e1f;border:1px solid rgba(34,197,94,.3);color:#86efac}.settings-toast--error{background:#ef44441f;border:1px solid rgba(239,68,68,.3);color:#fca5a5}.settings-modal-backdrop{position:fixed;inset:0;background:#020617b3;display:flex;align-items:center;justify-content:center;z-index:500;padding:20px}.settings-modal{width:100%;max-width:460px;background:#0f1423;border:1px solid rgba(148,163,184,.25);border-radius:16px;padding:24px;box-shadow:0 24px 60px #0009}.settings-modal-title{margin:0 0 12px;font-size:17px;color:#e5e7eb}.settings-modal-body{color:#cbd5e1;font-size:13px;line-height:1.5}.settings-modal-body p{margin:0 0 10px}.settings-modal-body code{background:#88c5ab26;color:#88c5ab;padding:1px 6px;border-radius:4px;font-size:12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.settings-modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}html[data-theme=light] body{background:#f8fafc;color:#1a1a1a}html[data-theme=light] .settings-screen,html[data-theme=light] .chat-shell,html[data-theme=light] .welcome-content,html[data-theme=light] .quiz-panel,html[data-theme=light] .progress-panel{background:#fff;border-color:#0f19291f;box-shadow:0 24px 60px #0f19291f;color:#1a1a1a}html[data-theme=light] .settings-sidebar{background:#f1f5f9;border-right-color:#0f19291a}html[data-theme=light] .settings-sidebar-header h1,html[data-theme=light] .settings-section h2,html[data-theme=light] .settings-section h3,html[data-theme=light] .settings-plan-label{color:#0f172a}html[data-theme=light] .settings-card{background:#f8fafc;border-color:#0f19291a}html[data-theme=light] .settings-nav-item{color:#334155}html[data-theme=light] 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p,html[data-theme=light] .upload-hint,html[data-theme=light] .doc-card-meta,html[data-theme=light] .doc-source-badge,html[data-theme=light] .no-docs{color:#475569}html[data-theme=light] .welcome-tagline{color:var(--teal-dim)}html[data-theme=light] .welcome-docs h3{color:#1e293b}html[data-theme=light] .doc-card-name{color:#0f172a}html[data-theme=light] .welcome-divider{color:#475569}html[data-theme=light] .welcome-divider:before,html[data-theme=light] .welcome-divider:after{background:#0f192924}html[data-theme=light] .welcome-join-btn{background:var(--teal-dim);border-color:var(--teal-dim);color:#fff}html[data-theme=light] .welcome-join-btn:hover{background:#2f615d;border-color:#2f615d}html[data-theme=light] .welcome-start-btn{border-color:var(--teal-dim);color:var(--teal-dim)}html[data-theme=light] .welcome-start-btn:hover{background:#5ba49f1a;border-color:var(--teal-dim)}html[data-theme=light] .upload-zone{border-color:#0f192940}html[data-theme=light] 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var(--edu-border);border-radius:var(--edu-radius);padding:var(--edu-spacing)}.edu-card-header{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:var(--edu-spacing-tight)}.edu-card-title{font-size:13px;font-weight:600;color:var(--edu-text)}.edu-stat{background:var(--edu-surface);border:1px solid 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var(--edu-border)}.edu-activity-item:last-child{border-bottom:none}.edu-activity-icon{flex-shrink:0;width:22px;height:22px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;font-family:ui-monospace,monospace}.edu-activity-icon.message{background:#60a5fa26;color:var(--edu-accent)}.edu-activity-icon.quiz{background:#4ade8026;color:var(--edu-success)}.edu-activity-icon.join{background:#fbbf2426;color:var(--edu-warning)}.edu-activity-content{flex-grow:1;min-width:0}.edu-activity-text{font-size:13px;color:var(--edu-text);line-height:1.4}.edu-activity-student{font-weight:500}.edu-activity-detail{color:var(--edu-text-muted)}.edu-activity-time{font-size:11px;color:var(--edu-text-dim);margin-top:2px}.edu-empty{text-align:center;padding:var(--edu-spacing-loose) 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0;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%}.edu-engagement-trend-bar{width:100%;min-height:2px;background:var(--edu-accent);border-radius:var(--edu-radius-sm) var(--edu-radius-sm) 0 0}.edu-engagement-trend-label{margin-top:4px;font-size:10px;color:var(--edu-text-dim);white-space:nowrap}.edu-engagement-docs{display:flex;flex-direction:column;gap:var(--edu-spacing-tight)}.edu-engagement-doc-row{display:grid;grid-template-columns:minmax(0,1.4fr) 2fr 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var(--edu-danger);border-radius:var(--edu-radius);color:var(--edu-danger);font-size:13px}.edu-toast-container{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:8px;z-index:1000}.edu-toast{min-width:280px;max-width:380px;padding:10px 14px;background:var(--edu-surface);border:1px solid var(--edu-border-strong);border-radius:var(--edu-radius);color:var(--edu-text);font-size:13px;box-shadow:0 4px 16px #0006;animation:edu-toast-in .18s ease-out}.edu-toast.success{border-left:3px solid var(--edu-success)}.edu-toast.error{border-left:3px solid var(--edu-danger)}.edu-toast.info{border-left:3px solid var(--edu-accent)}@keyframes edu-toast-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.edu-dialog-backdrop{position:fixed;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:800}.edu-dialog{background:var(--edu-surface);border:1px solid var(--edu-border-strong);border-radius:var(--edu-radius);padding:var(--edu-spacing-loose);max-width:440px;width:calc(100% - 48px)}.edu-dialog-title{font-size:16px;font-weight:600;color:var(--edu-text);margin:0 0 8px}.edu-dialog-body{font-size:13px;color:var(--edu-text-muted);line-height:1.5;margin-bottom:var(--edu-spacing-loose)}.edu-dialog-actions{display:flex;justify-content:flex-end;gap:8px}.edu-button{padding:7px 14px;background:transparent;border:1px solid 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var(--edu-spacing)}.edu-form-field{margin-bottom:var(--edu-spacing)}.edu-form-label{display:block;font-size:12px;font-weight:500;color:var(--edu-text-muted);margin-bottom:6px}.edu-form-input,.edu-form-textarea{display:block;width:100%;padding:8px 10px;background:var(--edu-bg);border:1px solid var(--edu-border);border-radius:var(--edu-radius-sm);color:var(--edu-text);font-size:13px;font-family:inherit}.edu-form-input:focus,.edu-form-textarea:focus{outline:none;border-color:var(--edu-accent)}.edu-form-textarea{resize:vertical;min-height:80px}.edu-filter-bar{display:flex;align-items:center;gap:12px;margin-bottom:var(--edu-spacing);padding-bottom:var(--edu-spacing);border-bottom:1px solid var(--edu-border)}.edu-filter-bar select,.edu-filter-bar input{padding:7px 10px;background:var(--edu-surface);border:1px solid 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var(--edu-border);color:var(--edu-text-muted);font-variant-numeric:tabular-nums}.edu-roster-table tr{cursor:pointer}.edu-roster-table tr:hover{background:var(--edu-surface-hover)}.edu-roster-table tr.removed{opacity:.6}.edu-roster-table tr.removed 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4px}.edu-detail-header-email{font-size:13px;color:var(--edu-text-dim);margin-bottom:8px}.edu-detail-meta{display:flex;gap:var(--edu-spacing);font-size:12px;color:var(--edu-text-muted)}.edu-detail-meta span{display:inline-flex;align-items:center;gap:6px}.edu-engagement-strip{display:flex;gap:3px;margin:var(--edu-spacing) 0}.edu-engagement-day{width:14px;height:14px;border-radius:2px;background:var(--edu-surface-2)}.edu-engagement-day.l1{background:#60a5fa40}.edu-engagement-day.l2{background:#60a5fa80}.edu-engagement-day.l3{background:#60a5fabf}.edu-engagement-day.l4{background:var(--edu-accent)}.edu-detail-doc-section{border:1px solid var(--edu-border);border-radius:var(--edu-radius);margin-bottom:var(--edu-spacing);overflow:hidden}.edu-detail-doc-header{background:var(--edu-surface-2);padding:10px 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