*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background:#f5f7fa;color:#333;line-height:1.6}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2)}.login-box{background:#fff;padding:2.5rem;border-radius:12px;box-shadow:0 10px 40px #0003;width:100%;max-width:400px}.login-box h1{text-align:center;color:#667eea;margin-bottom:.5rem}.login-box h2{text-align:center;font-weight:400;color:#666;margin-bottom:1.5rem;font-size:1.2rem}.login-box form{display:flex;flex-direction:column;gap:1rem}.login-box input{padding:.875rem 1rem;border:1px solid #ddd;border-radius:8px;font-size:1rem;transition:border-color .2s}.login-box input:focus{outline:none;border-color:#667eea}.login-box button{padding:.875rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.login-box button:hover{transform:translateY(-1px);box-shadow:0 4px 12px #667eea66}.error{background:#fee;color:#c00;padding:.75rem 1rem;border-radius:8px;font-size:.9rem}.navbar{background:#fff;padding:0 2rem;height:60px;display:flex;align-items:center;justify-content:space-between;box-shadow:0 2px 10px #0000001a;position:sticky;top:0;z-index:100}.nav-brand{font-size:1.25rem;font-weight:700;color:#667eea}.nav-tabs{display:flex;gap:0;height:100%}.nav-tabs button{padding:0 1.25rem;height:60px;border:none;background:transparent;font-size:.95rem;font-weight:500;color:#666;cursor:pointer;position:relative;transition:color .2s}.nav-tabs button:hover,.nav-tabs button.active{color:#667eea}.nav-tabs button.active:after{content:"";position:absolute;bottom:0;left:0;right:0;height:3px;background:linear-gradient(135deg,#667eea,#764ba2)}.nav-user{display:flex;align-items:center;gap:1rem}.nav-user span{color:#666;font-size:.9rem}.logout-btn{padding:.5rem 1rem;background:#f5f5f5;border:none;border-radius:6px;color:#666;cursor:pointer;font-size:.9rem;transition:all .2s}.logout-btn:hover{background:#e0e0e0}.main-content{max-width:1200px;margin:0 auto;padding:2rem;width:95%}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 2rem;text-align:center}.loading-spinner{width:50px;height:50px;border:4px solid #f3f3f3;border-top:4px solid #667eea;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:1.5rem}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-container{text-align:center;padding:3rem 2rem}.error-container h3{color:#c00;margin-bottom:.5rem}.error-container p{color:#666;margin-bottom:1rem}.empty-state{text-align:center;padding:3rem 2rem;color:#888;background:#fff;border-radius:12px;border:1px solid #eee}.view-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;flex-wrap:wrap;gap:1rem}.view-header h2{font-size:1.5rem;color:#333}.filter-bar{display:flex;gap:1rem;align-items:center}.filter-bar label{display:flex;align-items:center;gap:.5rem;font-size:.9rem;color:#555}.filter-bar select{padding:.5rem .75rem;border:1px solid #ddd;border-radius:6px;font-size:.9rem;background:#fff}.back-nav{margin-right:auto}.btn-back{padding:.5rem 1rem;background:#f5f5f5;border:1px solid #ddd;border-radius:6px;color:#333;font-size:.95rem;cursor:pointer;transition:all .2s}.btn-back:hover{background:#e8e8e8}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:1.5rem}.stat-card{background:#fff;border-radius:12px;padding:1.5rem;text-align:center;box-shadow:0 2px 10px #0000000d;border:1px solid #eee}.stat-card.alert{border-color:#ffc107;background:#fffbf0}.stat-value{font-size:2rem;font-weight:700;color:#333;line-height:1.2}.stat-card.alert .stat-value{color:#e67e00}.stat-label{font-size:.85rem;color:#888;margin-top:.25rem}.stat-card.clickable{cursor:pointer;transition:transform .2s,box-shadow .2s}.stat-card.clickable:hover{transform:translateY(-2px);box-shadow:0 4px 16px #0000001f}.roster-panel{background:#fff;border-radius:12px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:0 2px 10px #0000000d;border:1px solid #eee}.roster-panel h3{font-size:1.1rem;color:#333;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:1px solid #eee}.teacher-selector{width:100%;max-width:400px;padding:.625rem .875rem;border:1px solid #ddd;border-radius:8px;font-size:.95rem;background:#fff;color:#333;margin-bottom:1.25rem}.teacher-selector:focus{outline:none;border-color:#667eea}.course-card{border:1px solid #eee;border-radius:8px;margin-bottom:.75rem;overflow:hidden}.course-header{display:flex;align-items:center;justify-content:space-between;padding:.875rem 1rem;background:#fafbfc;cursor:pointer;transition:background .15s;-webkit-user-select:none;user-select:none}.course-header:hover{background:#f0f2ff}.course-header-left{display:flex;align-items:center;gap:.75rem}.course-header-left strong{color:#333;font-size:.95rem}.course-grade{font-size:.8rem;color:#667eea;background:#e8e8ff;padding:.15rem .5rem;border-radius:4px}.course-student-count{font-size:.85rem;color:#888;white-space:nowrap}.course-expand-icon{font-size:.8rem;color:#aaa;transition:transform .2s;margin-left:.5rem}.course-expand-icon.expanded{transform:rotate(90deg)}.course-students{padding:.5rem 1rem .75rem;border-top:1px solid #eee}.course-students table{width:100%;border-collapse:collapse;font-size:.9rem}.course-students th{text-align:left;padding:.5rem .75rem;font-size:.8rem;font-weight:600;color:#555;text-transform:uppercase;letter-spacing:.5px;border-bottom:1px solid #eee}.course-students td{padding:.5rem .75rem;border-bottom:1px solid #f5f5f5;color:#444}.course-students tbody tr:last-child td{border-bottom:none}.course-students tbody tr:hover{background:#f8f9ff}.student-name-link{color:#667eea;cursor:pointer;font-weight:500;background:none;border:none;padding:0;font-size:inherit;text-align:left}.student-name-link:hover{color:#764ba2;text-decoration:underline}.roster-course-info{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;font-size:.9rem;color:#555}.roster-course-detail{color:#666}.roster-empty{text-align:center;padding:2rem 1rem;color:#888;font-size:.9rem}.roster-loading{text-align:center;padding:1.5rem 1rem;color:#888;font-size:.9rem}.panel{background:#fff;border-radius:12px;padding:1.5rem;margin-bottom:1.5rem;box-shadow:0 2px 10px #0000000d;border:1px solid #eee}.panel h3{font-size:1.1rem;color:#333;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:1px solid #eee}.data-table{width:100%;border-collapse:collapse;font-size:.9rem}.data-table th{text-align:left;padding:.75rem 1rem;color:#555;font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.5px;border-bottom:2px solid #eee}.data-table td{padding:.75rem 1rem;border-bottom:1px solid #f0f0f0;color:#444}.data-table tbody tr:hover{background:#f8f9ff}.data-table tbody tr:last-child td{border-bottom:none}.severity-danger{background:#fff5f5}.severity-danger:hover{background:#ffeded!important}.severity-warning{background:#fffbf0}.severity-warning:hover{background:#fff7e0!important}.hint-badge{display:inline-block;padding:.2rem .6rem;border-radius:12px;font-size:.8rem;font-weight:600;background:#fee;color:#c00}.status-badge{display:inline-block;padding:.2rem .6rem;border-radius:12px;font-size:.8rem;font-weight:500;text-transform:capitalize}.badge-good{background:#d4edda;color:#155724}.badge-review{background:#fff3cd;color:#856404}.badge-new{background:#d1ecf1;color:#0c5460}.priority-badge{display:inline-block;padding:.2rem .5rem;border-radius:4px;font-size:.75rem;font-weight:600;text-transform:uppercase;margin-right:.5rem}.priority-badge.high{background:#fee;color:#c00}.priority-badge.medium{background:#fff3cd;color:#856404}.priority-badge.low{background:#d1ecf1;color:#0c5460}.btn-primary{padding:.6rem 1.25rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 12px #667eea66}.btn-sm{padding:.35rem .75rem;font-size:.8rem;border-radius:6px;border:none;cursor:pointer;font-weight:500;transition:all .2s}.btn-sm.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.btn-sm.btn-link{background:transparent;color:#667eea;text-decoration:underline;padding:.35rem .5rem}.btn-sm.btn-link:hover{color:#764ba2}.reason-cell{max-width:200px;font-size:.85rem;color:#666}.actions-cell{display:flex;gap:.5rem;flex-wrap:nowrap}.actions-list{display:flex;flex-direction:column;gap:1rem}.action-card{padding:1rem 1.25rem;border-radius:8px;border:1px solid #eee;background:#fafbfc}.action-card.priority-high{border-left:4px solid #dc3545}.action-card.priority-medium{border-left:4px solid #ffc107}.action-card.priority-low{border-left:4px solid #17a2b8}.action-header{display:flex;align-items:center;margin-bottom:.5rem}.action-card p{color:#555;font-size:.9rem;margin-bottom:.5rem}.action-students{font-size:.85rem;color:#888;margin-bottom:.75rem}.topic-summary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}.topic-summary-card{padding:1rem;border:1px solid #eee;border-radius:8px;background:#fafbfc}.topic-summary-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.75rem}.student-count{font-size:.8rem;color:#888}.topic-summary-students{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:.75rem}.student-chip{padding:.2rem .6rem;background:#e8e8ff;color:#667eea;border-radius:12px;font-size:.8rem}.student-header-card{display:flex;align-items:center;gap:1.5rem;padding:1.5rem 2rem;background:#fff;border-radius:12px;box-shadow:0 2px 10px #0000000d;border:1px solid #eee;margin-bottom:1.5rem;flex-wrap:wrap}.student-avatar{width:60px;height:60px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;flex-shrink:0}.student-info{flex:1;min-width:150px}.student-info h2{font-size:1.4rem;color:#333;margin-bottom:.1rem}.student-id{font-size:.85rem;color:#888}.student-stats-row{display:flex;gap:2rem}.mini-stat{text-align:center}.mini-stat-value{font-size:1.5rem;font-weight:700;color:#333}.mini-stat-label{font-size:.75rem;color:#888;text-transform:uppercase;letter-spacing:.5px}.topic-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:1.5rem}.topic-column{background:#fff;border-radius:12px;padding:1.25rem;border:1px solid #eee;box-shadow:0 2px 10px #0000000d}.topic-column h3{font-size:.9rem;margin-bottom:.75rem;padding-bottom:.5rem;border-bottom:2px solid #eee}.topic-column.struggling h3{color:#e67e00;border-color:#ffc107}.topic-column.mastered h3{color:#28a745;border-color:#28a745}.topic-column.keypoints h3{color:#0c5460;border-color:#17a2b8}.topic-chip{padding:.4rem .75rem;border-radius:8px;font-size:.85rem;margin-bottom:.5rem}.topic-struggling{background:#fff3cd;color:#856404}.topic-mastered{background:#d4edda;color:#155724}.topic-keypoint{background:#d1ecf1;color:#0c5460}.empty-text{color:#aaa;font-size:.85rem;font-style:italic}.quick-actions{display:flex;gap:1rem;flex-wrap:wrap}.btn-action{padding:.75rem 1.25rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:8px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-action:hover{transform:translateY(-1px);box-shadow:0 4px 12px #667eea66}.conversation-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:200;padding:1rem}.conversation-modal{background:#fff;border-radius:12px;width:100%;max-width:700px;max-height:85vh;display:flex;flex-direction:column;box-shadow:0 20px 60px #0000004d}.conversation-header{display:flex;align-items:flex-start;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid #eee;flex-shrink:0}.conversation-header-info h3{font-size:1.2rem;color:#333;margin-bottom:.5rem}.conversation-meta{display:flex;flex-wrap:wrap;gap:.75rem;font-size:.85rem;color:#666}.conversation-tag{background:#e8e8ff;color:#667eea;padding:.15rem .5rem;border-radius:4px;font-size:.8rem;font-weight:500}.conversation-close{background:none;border:none;font-size:1.5rem;color:#999;cursor:pointer;padding:0 .25rem;line-height:1;flex-shrink:0}.conversation-close:hover{color:#333}.conversation-messages{flex:1;overflow-y:auto;padding:1.25rem 1.5rem;display:flex;flex-direction:column;gap:.75rem}.conversation-bubble{max-width:85%;padding:.75rem 1rem;border-radius:12px;font-size:.9rem;line-height:1.5}.bubble-user{align-self:flex-start;background:#f0f0f0;border-bottom-left-radius:4px}.bubble-assistant{align-self:flex-end;background:#e8e8ff;border-bottom-right-radius:4px}.bubble-role{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px;margin-bottom:.25rem;color:#888}.bubble-user .bubble-role{color:#666}.bubble-assistant .bubble-role{color:#667eea}.bubble-content{color:#333}.bubble-badges{display:flex;gap:.5rem;margin-top:.5rem}.action-badge{display:inline-block;padding:.15rem .5rem;border-radius:4px;font-size:.75rem;font-weight:600}.hint-level-pill{display:inline-block;padding:.15rem .5rem;border-radius:4px;font-size:.75rem;font-weight:500;color:#5d4037}.bubble-key-points{margin-top:.5rem;padding-top:.5rem;border-top:1px solid rgba(0,0,0,.1);font-size:.85rem}.bubble-key-points strong{color:#7b1fa2;font-size:.8rem}.bubble-key-points ul{margin:.25rem 0 0 1.25rem;padding:0}.bubble-key-points li{margin-bottom:.15rem;color:#555}.session-row-clickable{cursor:pointer;transition:background .15s}.session-row-clickable:hover{background:#eef0ff!important}.student-grade{color:#667eea;font-weight:500}.settings-btn{background:none;border:none;font-size:1.4rem;color:#888;cursor:pointer;padding:.25rem .5rem;line-height:1;transition:color .2s}.settings-btn:hover{color:#667eea}.settings-form{display:flex;flex-direction:column;gap:1.25rem;padding:.5rem 0}.settings-field{display:flex;flex-direction:column;gap:.25rem}.settings-field label{font-weight:600;font-size:.9rem;color:#333}.settings-field input{padding:.625rem .875rem;border:1px solid #ddd;border-radius:8px;font-size:.95rem;width:100%;transition:border-color .2s}.settings-field input:focus{outline:none;border-color:#667eea}.settings-field-desc{font-size:.8rem;color:#888}.settings-actions{display:flex;gap:1rem;margin-top:.5rem}.settings-success{background:#d4edda;color:#155724;padding:.625rem 1rem;border-radius:8px;font-size:.9rem}.settings-note{font-size:.8rem;color:#999;font-style:italic;margin-top:.25rem}@media(max-width:768px){.navbar{padding:.5rem 1rem;flex-wrap:wrap;height:auto;min-height:60px;gap:.5rem}.nav-tabs{order:3;width:100%}.nav-tabs button{flex:1;height:40px;font-size:.85rem}.nav-user span{display:none}.main-content{padding:1rem}.view-header{flex-direction:column;align-items:flex-start}.stats-grid{grid-template-columns:repeat(2,1fr)}.topic-columns{grid-template-columns:1fr}.student-header-card{flex-direction:column;text-align:center}.student-stats-row{justify-content:center}.data-table{font-size:.8rem}.data-table th,.data-table td{padding:.5rem}.actions-cell,.quick-actions{flex-direction:column}.topic-summary-grid{grid-template-columns:1fr}}