:root{--font-main: "Inter", system-ui, -apple-system, sans-serif;--lvl-7: #9c27b0;--lvl-6: #2196f3;--lvl-5: #4caf50;--lvl-4: #ffeb3b;--lvl-3: #ff9800;--lvl-2: #f44336;--lvl-1: #795548;--bg-app: #f8fafc;--card-bg: #ffffff;--text-main: #1e293b;--text-muted: #64748b;--shadow-sm: 0 1px 3px 0 rgb(0 0 0 / .1);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-main);background-color:var(--bg-app);color:var(--text-main);min-height:100vh}#root{display:flex;flex-direction:column;min-height:100vh}.app-container{max-width:1200px;margin:0 auto;padding:2rem;display:grid;grid-template-columns:350px 1fr;gap:3rem;align-items:start}header{grid-column:1 / -1;text-align:center;margin-bottom:2rem}h1{font-size:2.5rem;font-weight:800;background:linear-gradient(135deg,#1e293b,#334155);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.thermometer{display:flex;flex-direction:column;gap:.5rem;position:sticky;top:2rem}.level-row{display:flex;align-items:stretch;min-height:100px;border-radius:12px;overflow:hidden;box-shadow:var(--shadow-sm);background-color:#fff;transition:transform .3s ease,box-shadow .3s ease}.level-indicator{width:20px;flex-shrink:0}.level-content{flex-grow:1;padding:1rem;display:flex;flex-direction:column;justify-content:center;border-left:1px solid #e2e8f0}.level-label{font-weight:700;font-size:1.1rem;margin-bottom:.25rem}.level-desc{font-size:.85rem;color:var(--text-muted)}.students-in-level{margin-top:1rem;display:flex;flex-wrap:wrap;gap:.5rem;min-height:40px}.student-badge{background:#fff;border:1px solid #e2e8f0;padding:.5rem .75rem;border-radius:8px;display:flex;align-items:center;gap:.75rem;box-shadow:var(--shadow-sm);animation:slideIn .3s ease-out}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.student-name{font-weight:600;font-size:.9rem}.controls{display:flex;gap:.25rem}.btn-control{background:none;border:1px solid #e2e8f0;border-radius:4px;padding:.25rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;color:var(--text-muted)}.btn-control:hover{background-color:#f1f5f9;color:var(--text-main);border-color:#cbd5e1}.btn-up:hover{color:#10b981}.btn-down:hover{color:#ef4444}.admin-panel{background:#fff;padding:1.5rem;border-radius:16px;box-shadow:var(--shadow-md);position:sticky;top:2rem}.admin-title{font-size:1.25rem;font-weight:700;margin-bottom:1rem;display:flex;align-items:center;gap:.5rem}.add-student-form{display:flex;flex-direction:column;gap:.75rem;margin-bottom:2rem}input{padding:.75rem 1rem;border:1px solid #e2e8f0;border-radius:8px;font-family:inherit;font-size:.95rem}input:focus{outline:none;border-color:#3b82f6;ring:2px solid #3b82f633}.btn-primary{background-color:#1e293b;color:#fff;border:none;padding:.75rem;border-radius:8px;font-weight:600;cursor:pointer;transition:background .2s}.btn-primary:hover{background-color:#334155}.btn-reset{margin-top:1rem;background-color:#fff;border:1px solid #e2e8f0;color:#ef4444;padding:.5rem;width:100%;border-radius:8px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.5rem}.btn-reset:hover{background-color:#fef2f2;border-color:#fecaca}.student-list-admin{list-style:none}.student-item-admin{display:flex;justify-content:space-between;align-items:center;padding:.5rem 0;border-bottom:1px solid #f1f5f9}.btn-delete{color:#94a3b8;background:none;border:none;cursor:pointer}.btn-delete:hover{color:#ef4444}.scanner-overlay{position:fixed;inset:0;pointer-events:none;z-index:1000;display:flex;flex-direction:column;align-items:center;justify-content:center;opacity:0;transition:opacity .5s ease}.scanner-overlay.active{opacity:1}.scanner-line{position:absolute;left:0;width:100%;height:2px;background:#22c55e80;box-shadow:0 0 15px 5px #22c55eb3;animation:scan 3s infinite linear}@keyframes scan{0%{top:0}to{top:100%}}.scanner-text{background:#000000b3;color:#22c55e;padding:.5rem 1rem;font-family:monospace;border-radius:4px;text-transform:uppercase;letter-spacing:2px;border:1px solid #22c55e;animation:blink 1.5s infinite}@keyframes blink{0%,to{opacity:1}50%{opacity:.3}}.stealth-container{position:fixed;inset:0;background-color:#020617;color:#1e293b;z-index:9999;display:flex;flex-direction:column;padding:1rem;-webkit-user-select:none;user-select:none;touch-action:manipulation}.stealth-header{font-family:monospace;font-size:.7rem;margin-bottom:2rem;opacity:.3}.stealth-grid{display:grid;grid-template-columns:1fr;gap:1.5rem;flex-grow:1}.stealth-student-row{display:flex;justify-content:space-between;align-items:center;padding:1rem;border:1px solid #0f172a;border-radius:8px}.stealth-name{color:#1e293b;font-weight:500}.stealth-controls{display:flex;gap:1.5rem}.btn-stealth{background:#0f172a;color:#111827;border:none;width:60px;height:60px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.6rem}.btn-stealth:active{background:#1e293b}.btn-exit-stealth{position:absolute;top:5px;right:5px;width:10px;height:10px;background:transparent;border:none}@media(max-width:900px){.app-container{grid-template-columns:1fr}}