:root{--bg: #f8fafc;--bg2: #ffffff;--bg3: #f1f5f9;--text: #0f172a;--text2: #64748b;--accent: #2563eb;--accent-light: #dbeafe;--green: #16a34a;--green-light: #dcfce7;--amber: #d97706;--amber-light: #fef9c3;--red: #dc2626;--red-light: #fee2e2;--purple: #7c3aed;--border: #e2e8f0;--radius: 12px;--radius-sm: 6px;--shadow: 0 1px 3px rgba(0,0,0,.06);--font: "Inter", system-ui, -apple-system, sans-serif;--mono: "JetBrains Mono", "Fira Code", monospace}*{margin:0;padding:0;box-sizing:border-box}body{background:var(--bg);color:var(--text);font-family:var(--font);min-height:100vh;-webkit-font-smoothing:antialiased}#admin-header{display:flex;align-items:center;justify-content:space-between;padding:10px 24px;background:var(--bg2);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;gap:12px}.admin-logo{display:flex;align-items:center;gap:10px;flex-shrink:0}.logo-icon{font-size:22px;color:var(--accent);font-weight:700;width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--accent-light);border-radius:8px}.admin-logo h1{font-size:15px;font-weight:700;white-space:nowrap}.admin-logo small{font-size:10px;color:var(--text2);font-family:var(--mono)}.admin-tabs{display:flex;gap:2px;background:var(--bg3);border-radius:var(--radius-sm);padding:3px}.tab-btn{padding:6px 14px;font-size:12px;border:none;border-radius:4px;cursor:pointer;font-family:var(--font);background:transparent;color:var(--text2);transition:all .15s;white-space:nowrap}.tab-btn:hover{color:var(--text)}.tab-btn.active{background:var(--bg2);color:var(--text);font-weight:600;box-shadow:0 1px 2px #0000000d}.back-link{padding:6px 12px;font-size:11px;border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;font-family:var(--font);background:var(--bg2);color:var(--text2);text-decoration:none;transition:all .15s;white-space:nowrap;flex-shrink:0}.back-link:hover{background:var(--accent-light);color:var(--accent)}.tab-panel{display:none;padding:20px 24px}.tab-panel.active{display:block}.stats-row{display:flex;gap:16px;margin-bottom:16px;flex-wrap:wrap}.stat-card{flex:1;min-width:140px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;text-align:center}.stat-card .stat-value{font-size:28px;font-weight:800;color:var(--accent);line-height:1}.stat-card .stat-label{font-size:10px;text-transform:uppercase;letter-spacing:.5px;color:var(--text2);margin-top:4px}.stat-card.accent-green .stat-value{color:var(--green)}.stat-card.accent-amber .stat-value{color:var(--amber)}.stat-card.accent-purple .stat-value{color:var(--purple)}.panel-controls{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}.panel-controls input,.panel-controls select,.panel-controls button{padding:6px 12px;font-size:11px;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font);background:var(--bg2);color:var(--text2);outline:none}.panel-controls input:focus,.panel-controls select:focus{border-color:var(--accent)}.panel-controls input{min-width:180px}.panel-controls button{cursor:pointer}.panel-controls button:hover{background:var(--accent-light);color:var(--accent)}#students-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:12px}.student-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:16px;transition:all .15s;cursor:pointer}.student-card:hover{box-shadow:var(--shadow);border-color:var(--accent);transform:translateY(-1px)}.student-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.student-name-row{display:flex;align-items:center;gap:8px}.student-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:600;color:#fff}.student-name{font-size:13px;font-weight:600}.student-id{font-size:9px;color:var(--text2);font-family:var(--mono)}.student-mastery-pct{font-size:22px;font-weight:800;color:var(--accent)}.student-mastery-bar{height:6px;background:var(--border);border-radius:3px;margin-bottom:10px;overflow:hidden}.mastery-fill{height:100%;border-radius:3px;transition:width .3s}.student-state-row{display:flex;gap:12px;font-size:10px;font-family:var(--mono);color:var(--text2)}.student-state-row span{display:flex;align-items:center;gap:4px}.state-dot{width:6px;height:6px;border-radius:50%;display:inline-block}.student-weak{margin-top:8px;font-size:10px;color:var(--red);font-family:var(--mono)}.student-recent{margin-top:6px;font-size:9px;color:var(--text2);font-family:var(--mono);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.modal-overlay{position:fixed;inset:0;background:#0f172a80;display:flex;align-items:center;justify-content:center;z-index:300;backdrop-filter:blur(3px)}.modal-overlay.hidden{display:none}.modal{background:var(--bg2);border-radius:16px;box-shadow:0 20px 60px #00000026;max-height:90vh;display:flex;flex-direction:column;animation:modalIn .2s ease}.modal-large{width:800px;max-width:95vw}@keyframes modalIn{0%{opacity:0;transform:scale(.95) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-bottom:1px solid var(--border)}.modal-close{width:30px;height:30px;border:none;background:var(--bg3);border-radius:50%;font-size:16px;cursor:pointer;color:var(--text2);display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}.modal-close:hover{background:var(--red-light);color:var(--red)}.modal-body{padding:20px 24px;overflow-y:auto}.sm-overview{display:flex;gap:20px;margin-bottom:20px;align-items:center}.sm-avatar-large{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;color:#fff;flex-shrink:0}.sm-name{font-size:18px;font-weight:700}.sm-id{font-size:10px;color:var(--text2);font-family:var(--mono)}.sm-mastery-big{font-size:40px;font-weight:800;margin-left:auto}.sm-stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:20px}.sm-stat{text-align:center;padding:12px 8px;background:var(--bg3);border-radius:var(--radius-sm)}.sm-stat-val{font-size:20px;font-weight:800}.sm-stat-label{font-size:9px;color:var(--text2);text-transform:uppercase;letter-spacing:.5px;margin-top:2px}.sm-section{margin-bottom:16px}.sm-section h3{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--text2);margin-bottom:8px}.sm-concept-grid{display:grid;grid-template-columns:1fr 1fr;gap:4px}.sm-concept-row{display:flex;align-items:center;gap:8px;padding:4px 8px;background:var(--bg3);border-radius:4px}.sm-concept-name{width:110px;flex-shrink:0;font-family:var(--mono);font-size:10px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sm-concept-bar{flex:1;height:6px;background:var(--border);border-radius:3px;overflow:hidden}.sm-concept-fill{height:100%;border-radius:3px}.sm-concept-pct{width:28px;text-align:right;font-family:var(--mono);font-size:10px;font-weight:600}.sm-timeline{display:flex;flex-direction:column;gap:6px}.sm-timeline-item{display:flex;gap:12px;align-items:baseline;font-family:var(--mono);font-size:11px}.sm-timeline-time{color:var(--text2);flex-shrink:0;min-width:70px}.sm-timeline-query{color:var(--text)}.sm-timeline-intent{font-size:9px;background:var(--bg3);padding:1px 6px;border-radius:10px;color:var(--text2);margin-left:6px}.two-panel{display:flex;gap:0;height:calc(100vh - 190px);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--bg2)}.panel-left{width:320px;flex-shrink:0;border-right:1px solid var(--border);display:flex;flex-direction:column}.panel-left-header{padding:10px 12px;border-bottom:1px solid var(--border);display:flex;gap:6px;flex-wrap:wrap}.panel-left-header input,.panel-left-header select{padding:5px 8px;font-size:11px;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font);background:var(--bg2);color:var(--text);outline:none}.panel-left-header input{flex:1;min-width:100px}.panel-left-header input:focus,.panel-left-header select:focus{border-color:var(--accent)}.panel-left-header select{flex-shrink:0}#concept-list-panel{flex:1;overflow-y:auto}.concept-list-item{display:flex;align-items:center;gap:8px;padding:10px 12px;cursor:pointer;transition:all .12s;border-bottom:1px solid var(--border)}.concept-list-item:hover{background:var(--accent-light)}.concept-list-item.active{background:var(--accent-light);border-left:3px solid var(--accent);padding-left:9px}.concept-list-item .cl-name{font-size:12px;font-weight:600;flex:1}.concept-list-item .cl-id{font-size:9px;color:var(--text2);font-family:var(--mono)}.concept-list-item .cl-dots{display:flex;gap:2px;flex-shrink:0}.concept-list-item .cl-dot{width:5px;height:5px;border-radius:50%}.concept-list-item .cl-dot.has{background:var(--green)}.concept-list-item .cl-dot.missing{background:var(--border)}.diff-badge{width:20px;height:20px;border-radius:50%;font-size:9px;font-weight:700;display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0}.diff-1{background:var(--green)}.diff-2{background:var(--accent)}.diff-3{background:var(--purple)}.diff-4{background:var(--amber)}.diff-5{background:var(--red)}.panel-right{flex:1;overflow-y:auto;padding:20px 24px}.preview-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text2);gap:8px}.preview-icon{font-size:40px;opacity:.5}.preview-header{margin-bottom:16px}.preview-header h2{font-size:18px;font-weight:700;display:flex;align-items:center;gap:10px}.preview-header .preview-desc{font-size:12px;color:var(--text2);line-height:1.5;margin-top:6px}.preview-header .preview-meta{margin-top:6px;display:flex;gap:8px;flex-wrap:wrap}.preview-tag{font-size:9px;padding:2px 8px;border-radius:12px;font-family:var(--mono);background:var(--bg3);color:var(--text2)}.format-tabs{display:flex;gap:2px;margin-bottom:14px;border-bottom:1px solid var(--border);flex-wrap:wrap}.format-tab{padding:8px 14px;font-size:11px;border:none;background:transparent;cursor:pointer;font-family:var(--font);color:var(--text2);border-bottom:2px solid transparent;transition:all .15s}.format-tab:hover{color:var(--text);background:var(--bg3)}.format-tab.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}.format-display{background:var(--bg3);border-radius:var(--radius-sm);padding:16px 20px;font-size:12px;line-height:1.7;word-break:break-word;max-height:55vh;overflow-y:auto}.format-display h2{font-size:16px;font-weight:700;margin:8px 0 6px}.format-display h3{font-size:14px;font-weight:600;margin:6px 0 4px}.format-display strong{color:var(--accent);font-weight:600}.format-display ul{padding-left:18px;margin:4px 0}.format-display li{margin:2px 0}.format-display code{background:var(--bg2);padding:1px 5px;border-radius:3px;font-family:var(--mono);font-size:11px}.format-display hr{border:none;border-top:1px solid var(--border);margin:10px 0}.format-display table{border-collapse:collapse;width:100%;margin:8px 0;font-size:11px}.format-display th,.format-display td{border:1px solid var(--border);padding:5px 8px;text-align:left}.format-display th{background:var(--bg2);font-weight:600}.format-display blockquote{border-left:3px solid var(--accent);padding:4px 10px;margin:6px 0;color:var(--text2);background:var(--bg2);border-radius:0 4px 4px 0}#tab-graph.active{display:flex;gap:16px;height:calc(100vh - 120px)}.graph-container{flex:1;display:flex;flex-direction:column;min-width:0}#graph-viz{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);flex:1;overflow:hidden}#graph-viz svg{display:block;width:100%;height:100%}.graph-legend-hint{font-size:10px;color:var(--text2);margin-top:8px;display:flex;gap:12px;flex-wrap:wrap}.legend-dot{width:8px;height:8px;border-radius:50%;display:inline-block}.graph-sidebar{width:260px;background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:14px;overflow-y:auto;flex-shrink:0}.graph-sidebar h3{font-size:12px;text-transform:uppercase;letter-spacing:.5px;color:var(--text2);margin-bottom:8px}#graph-detail-text{font-size:12px;line-height:1.6;color:var(--text)}#graph-detail-formats{margin-top:10px}#graph-detail-formats .mini-format{font-size:10px;padding:4px 8px;background:var(--bg3);border-radius:4px;margin-top:4px;font-family:var(--mono);color:var(--text2)}@media (max-width: 700px){#admin-header{flex-wrap:wrap}.admin-tabs{order:3;width:100%;justify-content:center}#concept-grid,#students-grid{grid-template-columns:1fr}#tab-graph.active{flex-direction:column}.graph-sidebar{width:100%}.tab-panel{padding:12px 8px}}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:2px}