:root{--primary:#2563eb;--primary-hover:#1d4ed8;--secondary:#475569;--bg-main:#f8fafc;--card-bg:#fff;--text-main:#0f172a;--text-muted:#64748b;--border:#e2e8f0;--accent:#10b981;--shadow:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-main);color:var(--text-main);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.5}.auth-container{justify-content:center;align-items:center;min-height:100vh;padding:24px;display:flex}.auth-card{background:var(--card-bg);box-shadow:var(--shadow-lg);border:1px solid var(--border);border-radius:16px;width:100%;max-width:440px;padding:40px}.brand-badge{color:var(--primary);background:#eff6ff;border-radius:20px;margin-bottom:16px;padding:6px 14px;font-size:13px;font-weight:600;display:inline-block}.subtitle{color:var(--text-muted);margin-top:4px;margin-bottom:24px;font-size:14px}.form-group{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}label{color:#334155;font-size:13px;font-weight:600}input,select,textarea{border:1px solid var(--border);background:#fff;border-radius:8px;outline:none;width:100%;padding:10px 14px;font-size:14px;transition:border-color .2s}input:focus,select:focus,textarea:focus{border-color:var(--primary)}.btn-primary{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;width:100%;padding:11px 18px;font-size:14px;font-weight:600;transition:background .2s}.btn-primary:hover{background:var(--primary-hover)}.btn-secondary{color:#334155;border:1px solid var(--border);cursor:pointer;background:#f1f5f9;border-radius:8px;width:100%;padding:11px 18px;font-size:14px;font-weight:600}.btn-outline{border:1px solid var(--border);color:#334155;cursor:pointer;background:0 0;border-radius:8px;padding:8px 14px;font-size:13px}.divider{text-align:center;color:var(--text-muted);align-items:center;margin:20px 0;font-size:11px;font-weight:700;display:flex}.divider:before,.divider:after{content:"";border-bottom:1px solid var(--border);flex:1}.divider span{padding:0 10px}.auth-footer{text-align:center;color:var(--text-muted);margin-top:20px;font-size:13px}.auth-footer a{color:var(--primary);font-weight:600;text-decoration:none}.status-alert{border-left:4px solid var(--primary);background:#eff6ff;border-radius:6px;margin-top:14px;padding:10px 14px;font-size:13px}.dashboard-layout{flex-direction:column;min-height:100vh;display:flex}.app-header{border-bottom:1px solid var(--border);background:#fff;justify-content:space-between;align-items:center;padding:16px 32px;display:flex}.header-brand{align-items:center;gap:12px;display:flex}.logo-icon{font-size:28px}.app-header h1{font-size:18px;font-weight:700}.header-sub{color:var(--text-muted);font-size:12px}.header-user{align-items:center;gap:16px;display:flex}.user-badge{border:1px solid var(--border);background:#f8fafc;border-radius:20px;align-items:center;gap:8px;padding:6px 12px;font-size:13px;font-weight:600;display:flex}.dashboard-main{width:100%;max-width:1200px;margin:0 auto;padding:32px}.dashboard-hero{box-shadow:var(--shadow);border:1px solid var(--border);background:#fff;border-radius:14px;justify-content:space-between;align-items:center;margin-bottom:32px;padding:28px;display:flex}.hero-buttons{gap:12px;display:flex}.hero-buttons button{width:auto}.section-title{align-items:center;gap:12px;margin-bottom:16px;display:flex}.badge{color:var(--primary);background:#eff6ff;border-radius:12px;padding:3px 8px;font-size:12px;font-weight:600}.badge-outline{border:1px solid var(--border);color:var(--text-muted);border-radius:10px;padding:2px 8px;font-size:12px}.course-card{border:1px solid var(--border);background:#fff;border-radius:14px;margin-bottom:24px;padding:24px}.course-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.subjects-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;display:grid}.subject-card{border:1px solid var(--border);background:#f8fafc;border-radius:10px;flex-direction:column;justify-content:space-between;padding:18px;transition:transform .15s,box-shadow .15s;display:flex}.subject-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}.subject-code{color:var(--primary);text-transform:uppercase;font-size:11px;font-weight:700}.resource-count{color:var(--text-muted);margin:10px 0 16px;font-size:13px}.subject-actions{gap:8px;display:flex}.btn-sm{width:auto;padding:6px 12px;font-size:12px}.chat-layout{background:#f8fafc;flex-direction:column;height:100vh;display:flex}.chat-header{border-bottom:1px solid var(--border);background:#fff;justify-content:space-between;align-items:center;padding:14px 24px;display:flex}.chat-header-left{align-items:center;gap:16px;display:flex}.btn-back{cursor:pointer;background:#f1f5f9;border:none;border-radius:6px;padding:6px 12px;font-size:13px}.chat-title h2{font-size:16px;font-weight:700}.badge-grounded{color:#047857;background:#ecfdf5;border-radius:10px;padding:2px 8px;font-size:11px;font-weight:600}.chat-controls{align-items:center;gap:12px;display:flex}.subject-select{width:auto;padding:6px 10px;font-size:13px}.mode-toggle{background:#f1f5f9;border-radius:8px;gap:4px;padding:3px;display:flex}.mode-btn{cursor:pointer;color:#475569;background:0 0;border:none;border-radius:6px;padding:6px 12px;font-size:12px;font-weight:600}.mode-btn.active{color:var(--primary);background:#fff;box-shadow:0 1px 3px #0000001a}.chat-feed{flex-direction:column;flex:1;gap:18px;width:100%;max-width:900px;margin:0 auto;padding:24px;display:flex;overflow-y:auto}.message-row{display:flex}.user-row{justify-content:flex-end}.assistant-row{justify-content:flex-start}.message-bubble{max-width:75%;box-shadow:var(--shadow);border-radius:14px;padding:16px 20px}.user-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:2px}.assistant-bubble{color:var(--text-main);border:1px solid var(--border);background:#fff;border-bottom-left-radius:2px}.message-header{opacity:.8;margin-bottom:6px;font-size:12px}.sources-container{border-top:1px dashed var(--border);margin-top:14px;padding-top:12px}.sources-title{text-transform:uppercase;color:var(--text-muted);margin-bottom:6px;font-size:11px;font-weight:700}.source-tag{color:#334155;background:#f1f5f9;border:1px solid #e2e8f0;border-radius:6px;margin-bottom:6px;margin-right:6px;padding:5px 10px;font-size:12px;display:inline-block}.quick-prompts{align-items:center;gap:8px;width:100%;max-width:900px;margin:0 auto;padding:8px 24px;display:flex;overflow-x:auto}.quick-label{color:var(--text-muted);white-space:nowrap;font-size:12px}.quick-chip{border:1px solid var(--border);cursor:pointer;white-space:nowrap;color:#334155;background:#fff;border-radius:16px;padding:5px 12px;font-size:12px}.quick-chip:hover{border-color:var(--primary);background:#eff6ff}.chat-input-form{border-top:1px solid var(--border);background:#fff;gap:12px;width:100%;max-width:900px;margin:0 auto;padding:16px 24px;display:flex}.chat-input{border-radius:24px;flex:1;padding:12px 18px}.btn-send{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:24px;padding:0 24px;font-weight:600}.modal-overlay{z-index:1000;background:#0006;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal-card{width:100%;max-width:500px;box-shadow:var(--shadow-lg);background:#fff;border-radius:14px;padding:24px}.modal-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.close-btn{cursor:pointer;background:0 0;border:none;font-size:18px}.form-divider{text-align:center;color:var(--text-muted);align-items:center;margin:12px 0;font-size:10px;font-weight:700;display:flex}.form-divider:before,.form-divider:after{content:"";border-bottom:1px solid var(--border);flex:1}.form-divider span{padding:0 8px}.mode-ribbon-container{border-bottom:1px solid var(--border);background:#fff;align-items:center;gap:12px;padding:10px 24px;display:flex;overflow-x:auto}.current-mode-status{border-bottom:1px solid var(--border);color:var(--text-muted);background:#f8fafc;padding:6px 24px;font-size:12px}.current-mode-status strong{color:var(--primary);font-weight:600}.mode-ribbon-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;font-size:12px;font-weight:700}.mode-ribbon{gap:8px;padding-bottom:2px;display:flex;overflow-x:auto}.mode-ribbon .mode-btn{border:1px solid var(--border);cursor:pointer;white-space:nowrap;color:#334155;background:#f8fafc;border-radius:20px;padding:6px 14px;font-size:13px;font-weight:500;transition:all .2s}.mode-ribbon .mode-btn:hover{border-color:var(--primary);color:var(--primary);background:#eff6ff}.mode-ribbon .mode-btn.active{background:var(--primary);color:#fff;border-color:var(--primary);font-weight:600;box-shadow:0 2px 4px #2563eb40}.study-modes-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-top:14px;display:grid}.study-mode-card{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:12px;flex-direction:column;gap:8px;padding:20px;transition:transform .18s,box-shadow .18s,border-color .18s;display:flex}.study-mode-card:hover{box-shadow:var(--shadow-lg);border-color:var(--primary);transform:translateY(-3px)}.study-mode-icon{margin-bottom:4px;font-size:28px}.study-mode-card h4{color:var(--text-main);font-size:16px;font-weight:700}.study-mode-card p{color:var(--text-muted);font-size:13px;line-height:1.45}.assistant-bubble pre{color:#f8fafc;background:#0f172a;border-radius:8px;margin:10px 0;padding:12px 16px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:12.5px;line-height:1.4;overflow-x:auto}.assistant-bubble code{color:#0f172a;background:#f1f5f9;border-radius:4px;padding:2px 6px;font-size:12.5px}.btn-clear-chat{color:#475569;cursor:pointer;background:#f8fafc;border:1px solid #cbd5e1;border-radius:8px;width:auto;padding:6px 14px;font-size:13px;font-weight:500;transition:all .2s}.btn-clear-chat:hover:not(:disabled){color:#0f172a;background:#f1f5f9;border-color:#94a3b8}.btn-clear-chat:disabled{opacity:.6;cursor:not-allowed}.app-layout{background:var(--bg-main);min-height:100vh;display:flex}.sidebar{border-right:1px solid var(--border);background:#fff;flex-direction:column;flex-shrink:0;width:250px;padding:28px 20px;display:flex}.sidebar-brand h2{color:var(--primary);margin:0;font-size:1.25rem;font-weight:800}.sidebar-sub{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-top:4px;font-size:.72rem;font-weight:600;display:block}.sidebar nav{flex-direction:column;gap:8px;margin-top:32px;display:flex}.sidebar a{color:var(--text-main);border-radius:8px;align-items:center;gap:10px;padding:10px 14px;font-size:.95rem;font-weight:500;text-decoration:none;transition:all .2s;display:flex}.sidebar a:hover,.sidebar a.active{color:var(--primary);background:#eff6ff;font-weight:600}.btn-logout{color:#dc2626;cursor:pointer;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;width:100%;margin-top:auto;padding:10px 14px;font-weight:600;transition:background .2s}.btn-logout:hover{background:#fee2e2}.main-content{flex:1;padding:32px 40px;overflow-y:auto}.source-card{border:1px solid var(--border);color:var(--text-main);background:#f8fafc;border-radius:8px;align-items:center;gap:10px;padding:8px 12px;font-size:.85rem;transition:all .2s;display:inline-flex}.source-card:hover{border-color:var(--primary);background:#eff6ff}.source-icon{font-size:1.15rem}.source-info strong{color:#1e293b;font-size:.85rem;display:block}.source-meta{color:var(--text-muted);margin-top:2px;font-size:.75rem}.status-badge{white-space:nowrap;border-radius:20px;padding:4px 10px;font-size:12px;font-weight:600;display:inline-block}.badge-processing{color:#b45309;background:#fef3c7;border:1px solid #fde68a}.badge-completed{color:#059669;background:#ecfdf5;border:1px solid #a7f3d0}.badge-failed{color:#dc2626;background:#fef2f2;border:1px solid #fecaca}.badge-unknown{color:#64748b;background:#f1f5f9;border:1px solid #e2e8f0}.course-icon{margin-bottom:8px;font-size:2rem}.course-sem{color:var(--text-muted);margin:4px 0 10px;font-size:.85rem}.course-link{color:var(--primary);font-size:.85rem;font-weight:600}@media (width<=768px){.app-layout{flex-direction:column}.sidebar{border-right:none;border-bottom:1px solid var(--border);width:100%;padding:16px}.sidebar nav{flex-flow:wrap;margin-top:16px}.sidebar .btn-logout{margin-top:16px}.main-content{padding:20px 16px}}.markdown-view{flex-direction:column;gap:8px;line-height:1.6;display:flex}.markdown-view .md-h2{color:var(--text-main);margin-top:10px;margin-bottom:4px;font-size:1.15rem;font-weight:700}.markdown-view .md-h3{color:var(--text-main);margin-top:8px;margin-bottom:2px;font-size:1.05rem;font-weight:600}.markdown-view .md-h4{color:#1e293b;margin-top:6px;margin-bottom:2px;font-size:.95rem;font-weight:600}.markdown-view .md-p{margin:0}.markdown-view .md-ul,.markdown-view .md-ol{flex-direction:column;gap:4px;margin:4px 0;padding-left:20px;display:flex}.markdown-view .inline-code{color:#0f172a;border:1px solid var(--border);background:#f1f5f9;border-radius:4px;padding:2px 6px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:.85em}.markdown-view .code-block{color:#f8fafc;background:#0f172a;border-radius:8px;margin:8px 0;padding:12px 16px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:13px;position:relative;overflow-x:auto}.markdown-view .code-lang{text-transform:uppercase;color:#94a3b8;letter-spacing:.05em;margin-bottom:6px;font-size:10px;font-weight:700}.chat-container-split{background:var(--bg-main);height:100vh;display:flex;overflow:hidden}.chat-history-sidebar{border-right:1px solid var(--border);background:#fff;flex-direction:column;flex-shrink:0;width:260px;padding:16px 14px;display:flex}.chat-history-header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.chat-history-header h3{color:var(--text-main);font-size:14px;font-weight:700}.btn-new-chat{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:6px;margin-bottom:14px;padding:8px 12px;font-size:13px;font-weight:600;transition:background .2s;display:flex}.btn-new-chat:hover{background:var(--primary-hover)}.conversations-list{flex-direction:column;flex:1;gap:6px;display:flex;overflow-y:auto}.conversation-item{color:#334155;cursor:pointer;border:1px solid #0000;border-radius:8px;flex-direction:column;gap:2px;padding:10px 12px;font-size:13px;transition:all .18s;display:flex}.conversation-item:hover{background:#f1f5f9}.conversation-item.active{color:var(--primary);background:#eff6ff;border-color:#bfdbfe;font-weight:600}.conversation-item .conv-title{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.conversation-item .conv-date{color:var(--text-muted);font-size:11px}.chat-main-panel{flex-direction:column;flex:1;height:100vh;display:flex;overflow:hidden}@media (width<=768px){.chat-history-sidebar{display:none}}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px;margin:25px 0;display:grid}.stat-card{border:1px solid var(--border,#e2e8f0);background:#fff;border-radius:12px;padding:20px;box-shadow:0 1px 3px #0000000a}.stat-icon{margin-bottom:6px;font-size:28px}.stat-card p{color:var(--text-muted,#64748b);margin:0;font-size:13px;font-weight:500}.stat-card h2{color:var(--text-primary,#0f172a);margin:6px 0 0;font-size:28px}