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900px){.auth-shell{grid-template-columns:1fr}.auth-left{display:none}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.auth-right{align-items:flex-start;padding:32px 24px 40px;overflow-y:auto;min-height:100vh}.auth-right input,.auth-right select{-webkit-appearance:none;-moz-appearance:none;appearance:none;font-size:16px!important}}@media (max-width: 768px){.bottom-nav{display:flex}.sidebar,.hide-mobile{display:none!important}.app-shell,.app-shell.sidebar-collapsed{grid-template-columns:1fr}.main{padding-bottom:62px}.main{overflow-x:hidden}.topbar{padding:0 12px;gap:8px;overflow:hidden}.content{padding:14px 14px 20px}.page-header{padding:14px 16px}.page-title{font-size:1.2rem}.topic-row{grid-template-columns:1fr;gap:8px}.topic-row-actions{justify-content:flex-start}.progress-summary-grid,.portal-cards{grid-template-columns:1fr}.portal-topbar{padding:16px}}.print-only{display:none}@media 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var(--ease);background:var(--card)}.mode-card:hover{border-color:var(--gold);box-shadow:var(--shadow-md);transform:translateY(-2px)}.mode-card.selected{border-color:var(--gold);background:var(--T-bg)}.mode-card-icon{font-size:26px;margin-bottom:var(--sp-3)}.mode-card-title{font-family:var(--font-display);font-size:14px;font-weight:600;margin-bottom:4px}.mode-card-desc{font-size:12px;color:var(--muted);line-height:1.55}.enhance-options{display:flex;flex-direction:column;gap:var(--sp-3);margin:var(--sp-4) 0}.enhance-option{display:flex;align-items:flex-start;gap:var(--sp-3);padding:var(--sp-4);border:1.5px solid var(--border);border-radius:var(--r-md);cursor:pointer;transition:all var(--ease);background:var(--card)}.enhance-option:hover{border-color:var(--gold)}.enhance-option.checked{border-color:var(--gold);background:var(--T-bg)}.enhance-check{width:18px;height:18px;border-radius:4px;border:2px solid var(--border);flex-shrink:0;margin-top:1px;display:flex;align-items:center;justify-content:center;transition:all var(--ease);font-size:10px;color:#fff}.enhance-option.checked .enhance-check{background:var(--gold);border-color:var(--gold)}.enhance-title{font-weight:600;font-size:13px;margin-bottom:2px}.enhance-desc{font-size:12px;color:var(--muted);line-height:1.5}.chapter-item{border:1px solid var(--border);border-radius:var(--r-md);overflow:hidden;margin-bottom:var(--sp-2);transition:border-color var(--ease)}.chapter-item:hover{border-color:var(--gold-light)}.chapter-header{display:flex;align-items:center;gap:var(--sp-3);padding:13px var(--sp-5);cursor:pointer;background:var(--card);transition:background var(--ease)}.chapter-header:hover{background:var(--cream)}.chapter-num-badge{width:28px;height:28px;border-radius:var(--r-sm);background:var(--navy);color:var(--gold-light);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;font-family:var(--font-mono);flex-shrink:0}.chapter-arrow{color:var(--muted);transition:transform .2s;font-size:11px;margin-left:auto}.chapter-arrow.open{transform:rotate(90deg)}.chapter-body{padding:0 var(--sp-5) var(--sp-5);border-top:1px solid var(--border);background:var(--ivory)}.summary-box{background:var(--S-bg);border:1px solid var(--S-border);border-radius:var(--r-md);padding:10px 13px;margin-top:var(--sp-4);font-size:12.5px;color:var(--teal-dark);line-height:1.6}.analytics-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-sm)}@media (max-width: 820px){.tm-ca-grid{grid-template-columns:1fr!important}.tm-ca-grid button[type=submit]{width:100%}.tm-sa-bottom{grid-template-columns:1fr 1fr!important;grid-template-rows:auto auto}.tm-sa-bottom button[type=submit]{grid-column:1 / -1;width:100%}.tm-sa-row{display:flex!important;flex-wrap:wrap;gap:8px!important;align-items:center}.at-risk-reg{display:none!important}.myday-header{flex-wrap:wrap!important;gap:12px!important}.unit-row{flex-wrap:wrap}.unit-actions{width:100%;justify-content:flex-end}.teacher-stat-grid,.section-mini-grid{grid-template-columns:1fr 1fr!important}.myday-notify-grid{grid-template-columns:1fr!important}.co-header-card,.co-units-card{padding:16px!important}.co-header-flex{flex-direction:column!important;gap:14px!important}.co-header-flex>div:last-child{align-items:flex-start!important;flex-direction:row!important;flex-wrap:wrap;gap:10px!important}.unit-overview-row{display:flex!important;flex-wrap:wrap;gap:8px!important;padding:12px 14px!important;align-items:center}.unit-overview-title{flex:1;min-width:0}.unit-lock-btn{width:100%!important;padding:10px 16px!important;font-size:13px!important;text-align:center;display:flex;align-items:center;justify-content:center;gap:6px;min-height:44px;box-sizing:border-box}.co-topics-grid{grid-template-columns:1fr!important}.ue-topic-actions{width:100%!important;justify-content:flex-start!important}.ue-action-btn,.ue-icon-btn{min-height:40px!important;padding:8px 13px!important;box-sizing:border-box}.ue-unit-details-grid,.ue-add-topic-grid{grid-template-columns:1fr!important}.ue-add-topic-grid>button{width:100%;min-height:40px}}@media (max-width: 420px){.teacher-stat-grid{grid-template-columns:1fr!important}}.chat-shell{display:grid;grid-template-columns:220px 1fr;height:calc(100vh - 130px);overflow:hidden}.chat-sidebar{border-right:1px solid var(--border);background:var(--card);padding:var(--sp-5);overflow-y:auto;display:flex;flex-direction:column;gap:var(--sp-3)}.chat-area{display:flex;flex-direction:column;height:100%}.chat-messages{flex:1;overflow-y:auto;padding:var(--sp-6);display:flex;flex-direction:column;gap:var(--sp-4)}.msg{display:flex;gap:var(--sp-3);max-width:82%;animation:fadeUp .22s ease-out}.msg.user{align-self:flex-end;flex-direction:row-reverse}.msg-avatar{width:32px;height:32px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;overflow:hidden}.msg.bot .msg-avatar{background:var(--teal);color:#fff}.msg.user .msg-avatar{background:var(--navy);color:var(--gold-light);font-size:12px}.msg-avatar img{width:100%;height:100%;object-fit:cover}.msg-bubble{padding:10px 14px;border-radius:12px;font-size:13.5px;line-height:1.65;white-space:pre-wrap}.msg.bot .msg-bubble{background:var(--card);border:1px solid var(--border);color:var(--ink);border-radius:4px 12px 12px}.msg.user .msg-bubble{background:var(--teal);color:#fff;border-radius:12px 4px 12px 12px}.msg-actions{display:flex;gap:4px;margin-top:5px;opacity:0;transition:opacity var(--ease)}.msg:hover .msg-actions{opacity:1}.msg-action-btn{background:transparent;border:1px solid var(--border);border-radius:var(--r-sm);padding:2px 8px;font-size:11px;cursor:pointer;color:var(--muted);transition:all var(--ease)}.msg-action-btn:hover{background:var(--cream);color:var(--ink)}.msg-action-btn.bookmarked{background:var(--S-bg);color:var(--teal);border-color:var(--S-border)}.typing-indicator{display:flex;gap:5px;align-items:center;padding:12px 16px}.typing-dot{width:6px;height:6px;border-radius:50%;background:var(--muted);animation:pulse .9s ease-in-out infinite}.typing-dot:nth-child(2){animation-delay:.15s}.typing-dot:nth-child(3){animation-delay:.3s}.chat-input-area{padding:12px var(--sp-6);border-top:1px solid var(--border);background:var(--card);display:flex;gap:var(--sp-2);align-items:flex-end}.chat-input{flex:1;padding:9px 13px;border:1.5px solid var(--border);border-radius:10px;font-family:var(--font-body);font-size:13.5px;resize:none;min-height:42px;max-height:140px;outline:none;transition:border-color var(--ease);background:var(--ivory);color:var(--ink)}.chat-input:focus{border-color:var(--teal);background:var(--card)}.bookmark-item{font-size:12px;padding:var(--sp-2) var(--sp-3);border-radius:var(--r-sm);background:var(--S-bg);border:1px solid var(--S-border);color:var(--teal-dark);cursor:pointer;line-height:1.55;transition:background var(--ease)}.bookmark-item:hover{background:#2a7d6e24}.question-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r-lg);padding:var(--sp-6);margin-bottom:var(--sp-4);transition:border-color var(--ease)}.question-card.answered{border-color:var(--teal-light)}.question-num{font-family:var(--font-mono);font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:var(--sp-2)}.question-text{font-size:14.5px;font-weight:500;margin-bottom:var(--sp-4);line-height:1.6}.options{display:flex;flex-direction:column;gap:var(--sp-2)}.option{display:flex;align-items:center;gap:var(--sp-3);padding:10px 13px;border-radius:var(--r-md);border:1.5px solid var(--border);cursor:pointer;transition:all var(--ease);font-size:13px;background:var(--ivory)}.option:hover{border-color:var(--teal);background:var(--S-bg)}.option.selected{border-color:var(--teal);background:var(--S-bg);color:var(--teal-dark);font-weight:500}.option.correct{border-color:var(--success)!important;background:#2a7d3f1a!important;color:var(--success)!important}.option.wrong{border-color:var(--danger)!important;background:#b8323214!important;color:var(--danger)!important}.option-radio{width:16px;height:16px;border-radius:50%;border:2px solid var(--border);flex-shrink:0;display:flex;align-items:center;justify-content:center;transition:all var(--ease)}.option.selected .option-radio{border-color:var(--teal);background:var(--teal)}.option-radio-dot{width:6px;height:6px;border-radius:50%;background:#fff}.certificate-wrap{max-width:700px;margin:0 auto;background:#fff;border:3px solid var(--teal);border-radius:var(--r-xl);padding:52px;text-align:center;position:relative;box-shadow:var(--shadow-xl)}.certificate-inner{position:absolute;top:10px;right:10px;bottom:10px;left:10px;border:1px solid rgba(42,125,110,.2);border-radius:var(--r-lg);pointer-events:none}.certificate-seal{width:76px;height:76px;background:var(--teal);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto var(--sp-5);font-size:32px;box-shadow:0 8px 24px #2a7d6e59}.certificate-title{font-family:var(--font-display);font-size:2rem;color:var(--teal-dark)}.certificate-name{font-family:var(--font-display);font-size:1.6rem;font-style:italic;margin:var(--sp-5) 0 var(--sp-2)}.certificate-score{font-family:var(--font-mono);font-size:2.8rem;color:var(--teal);margin:var(--sp-4) 0;font-weight:700}.certificate-footer{display:flex;justify-content:space-around;margin-top:var(--sp-10);padding-top:var(--sp-5);border-top:1px solid var(--border)}.cert-sig-line{width:110px;height:1px;background:var(--ink);margin:0 auto var(--sp-1)}.cert-sig-label{font-size:10px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}.onboard-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--ivory);padding:var(--sp-6)}.onboard-card{max-width:460px;width:100%;background:var(--card);border:1px solid var(--border);border-radius:var(--r-xl);padding:var(--sp-10);box-shadow:var(--shadow-lg)}.onboard-logo{font-family:var(--font-display);font-size:2rem;color:var(--ink);text-align:center;margin-bottom:var(--sp-1)}.onboard-logo em{color:var(--teal);font-style:italic}.diag-option{display:flex;align-items:flex-start;gap:var(--sp-3);padding:10px 14px;border-radius:var(--r-md);border:1.5px solid var(--border);cursor:pointer;transition:all var(--ease);margin-bottom:var(--sp-2)}.diag-option:hover,.diag-option.selected{border-color:var(--teal);background:var(--S-bg)}.diag-radio{width:16px;height:16px;border-radius:50%;border:2px solid var(--border);flex-shrink:0;margin-top:2px;transition:all var(--ease)}.diag-option.selected .diag-radio{border-color:var(--teal);background:var(--teal)}.streak-fire{font-size:18px;animation:pulse 1s ease-in-out infinite alternate}.read-btn{display:inline-flex;align-items:center;gap:var(--sp-2);padding:5px 13px;border-radius:var(--r-sm);border:1px solid var(--S-border);background:var(--S-bg);color:var(--teal-dark);font-size:12px;font-weight:600;cursor:pointer;margin-top:var(--sp-4);transition:all var(--ease)}.read-btn.done{background:#2a7d3f1a;border-color:#2a7d3f33;color:var(--success)}.read-btn:hover{opacity:.85}@media (max-width: 768px){.chat-shell{grid-template-columns:1fr;height:calc(100vh - 118px)}.chat-sidebar{display:none}.chat-messages{padding:var(--sp-3)}.chat-input-area{padding:10px var(--sp-3)}.msg{max-width:92%}.certificate-wrap{padding:28px 20px}.certificate-title{font-size:1.4rem}.certificate-name{font-size:1.2rem}.certificate-score{font-size:2rem}}