.stats-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:20px;margin-bottom:30px}.stat-card{background:white;border-radius:20px;padding:20px;display:flex;align-items:center;gap:16px;border:1px solid var(--gray-200);transition:all 0.3s}.stat-card:hover{transform:translateY(-4px);box-shadow:0 10px 30px rgba(0,0,0,0.1)}.stat-icon{width:50px;height:50px;background:linear-gradient(135deg, #e0e7ff, #f0f4ff);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:24px;color:var(--primary-color)}.stat-value{font-size:1.6rem;font-weight:700;color:var(--gray-800)}.stat-label{font-size:0.75rem;color:var(--gray-500)}.picker-display{background:linear-gradient(145deg, #1a1a2e, #16213e);border-radius:24px;padding:30px;margin-bottom:24px;text-align:center}.display-container{min-height:150px;display:flex;align-items:center;justify-content:center}.display-content{color:white;transition:all 0.3s}.display-content .placeholder-text i{font-size:48px;color:rgba(255,255,255,0.2);margin-bottom:12px}.display-content .placeholder-text p{font-size:2rem;font-weight:700}.display-content .placeholder-text span{font-size:0.8rem;color:rgba(255,255,255,0.5)}.display-content .name-display{animation:popIn 0.5s ease}.display-content .name-display .name{font-size:3.5rem;font-weight:900;background:linear-gradient(135deg, #fbbf24, #f59e0b);-webkit-background-clip:text;-webkit-text-color:transparent}.display-content .name-display .info{font-size:0.9rem;color:rgba(255,255,255,0.6);margin-top:8px}.display-content .name-display .emoji{font-size:3rem;display:block;margin-bottom:8px}@keyframes popIn{0%{transform:scale(.5);opacity:0}70%{transform:scale(1.1)}100%{transform:scale(1);opacity:1}}@keyframes popOut{0%{transform:scale(1);opacity:1}100%{transform:scale(.5);opacity:0}}.display-actions{display:flex;justify-content:center;gap:16px;margin-top:20px;flex-wrap:wrap}.pick-btn{padding:12px 40px;font-size:1.1rem}.pick-btn:disabled{opacity:0.5;cursor:not-allowed}.list-section,.history-section{background:var(--gray-50);border-radius:20px;padding:20px;margin-bottom:24px}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;flex-wrap:wrap;gap:12px}.section-header h3{font-size:1rem;display:flex;align-items:center;gap:8px}.list-actions{display:flex;gap:8px}.list-input-area{display:flex;gap:12px;margin-bottom:16px}.list-input{flex:1;padding:8px 12px;border:1px solid var(--gray-300);border-radius:12px}.list-container{max-height:200px;overflow-y:auto;display:flex;flex-wrap:wrap;gap:8px;padding:8px}.student-tag{display:flex;align-items:center;gap:8px;background:white;padding:6px 12px 6px 16px;border-radius:30px;border:1px solid var(--gray-200);font-size:0.85rem;transition:all 0.2s}.student-tag.called{background:#d1fae5;border-color:#10b981;opacity:0.7}.student-tag .remove-btn{background:transparent;border:none;color:var(--gray-400);cursor:pointer;padding:0 4px}.student-tag .remove-btn:hover{color:#ef4444}.empty-list,.empty-history{text-align:center;padding:30px;color:var(--gray-400);width:100%}.empty-list i,.empty-history i{font-size:32px;margin-bottom:12px}.history-list{max-height:150px;overflow-y:auto}.history-item{display:flex;justify-content:space-between;padding:8px 12px;border-bottom:1px solid var(--gray-200);font-size:0.85rem}.history-item .time{color:var(--gray-400);font-size:0.75rem}.quick-examples{margin-bottom:24px}.example-buttons{display:flex;flex-wrap:wrap;gap:12px;margin-top:12px}.example-btn{background:var(--gray-100);border:1px solid var(--gray-300);padding:8px 20px;border-radius:40px;cursor:pointer;font-size:0.85rem;transition:all 0.2s}.example-btn:hover{background:var(--primary-color);color:white}.knowledge-grid{display:grid;grid-template-columns:repeat(4, 1fr);gap:20px;margin-top:20px}.knowledge-card{background:var(--gray-50);border-radius:16px;padding:20px;text-align:center}.knowledge-card i{font-size:28px;color:var(--primary-color);margin-bottom:12px}.knowledge-card h4{font-size:0.85rem;margin-bottom:8px}.knowledge-card p{font-size:0.75rem;color:var(--gray-500);line-height:1.5}@media (max-width:900px){.stats-grid{grid-template-columns:repeat(2, 1fr)}.knowledge-grid{grid-template-columns:repeat(2, 1fr)}}@media (max-width:600px){.stats-grid{grid-template-columns:1fr}.display-content .name-display .name{font-size:2.4rem}.display-actions{flex-direction:column;align-items:center}.list-input-area{flex-direction:column}.knowledge-grid{grid-template-columns:1fr}}