:root{--primary: #3b82f6;--primary-hover: #2563eb;--secondary: #10b981;--dark: #1e293b;--light: #f8fafc;--gray: #64748b;--bg: #f1f5f9;--border: #e2e8f0;--danger: #ef4444}body{font-family:Inter,system-ui,-apple-system,sans-serif;background-color:var(--bg);margin:0;color:var(--dark);line-height:1.6}h1,h2,h3{color:var(--dark);margin-top:0}h1{font-size:2rem;font-weight:700;margin-bottom:.5rem}h2{font-size:1.5rem;font-weight:600;margin-bottom:1.5rem;border-bottom:2px solid var(--border);padding-bottom:.5rem}.container{max-width:600px;margin:80px auto;padding:40px;background:#fff;border-radius:16px;box-shadow:0 10px 25px -5px #0000000d;text-align:center}.card{background:#fff;border-radius:12px;padding:30px;box-shadow:0 4px 6px -1px #0000000d;margin-bottom:30px}input{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:8px;font-size:1rem;box-sizing:border-box;transition:all .2s;background-color:var(--light)}input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #3b82f633;background-color:#fff}label{display:block;font-weight:500;margin-bottom:6px;color:var(--gray);font-size:.9rem}.input-group{margin-top:30px;display:flex;gap:12px}.input-group-col{display:flex;flex-direction:column;text-align:left;margin-bottom:15px}button{padding:12px 24px;background-color:var(--primary);color:#fff;border:none;border-radius:8px;font-weight:600;cursor:pointer;font-size:1rem;transition:all .2s ease-in-out;display:inline-flex;align-items:center;justify-content:center}button:hover{background-color:var(--primary-hover);transform:translateY(-1px)}button:active{transform:translateY(0)}.back-btn{background-color:var(--gray);margin-top:20px}.back-btn:hover{background-color:#475569}.logout-btn{background-color:#fff;color:var(--danger);border:1px solid var(--danger)}.logout-btn:hover{background-color:#fef2f2;color:#dc2626;border-color:#dc2626}.login-container{display:flex;align-items:center;justify-content:center;min-height:100vh}.login-card{background:#fff;padding:40px;border-radius:16px;box-shadow:0 10px 25px -5px #0000001a;width:100%;max-width:400px;text-align:center}.login-btn{width:100%;margin-top:10px}.details-card{display:flex;flex-direction:column;gap:30px;margin-top:30px;text-align:left}@media(min-width:768px){.details-card{flex-direction:row}}.qr-section{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--light);padding:20px;border-radius:12px}.qr-section qrcode{background:#fff;padding:10px;border-radius:8px;box-shadow:0 4px 6px -1px #0000000d}.hint{font-size:.9rem;color:var(--gray);margin-top:15px;text-align:center}.info-section{flex:2}.info-item{display:flex;flex-wrap:wrap;margin-bottom:15px;padding-bottom:15px;border-bottom:1px solid var(--border)}.info-item:last-child{border-bottom:none}.info-item strong{width:160px;color:var(--gray);font-weight:500}.info-item span{font-weight:600;color:var(--dark);flex:1}.error-msg{color:var(--danger);background:#fef2f2;padding:12px;border-radius:8px;margin-bottom:20px;font-weight:500;border:1px solid #fecaca}.admin-container{max-width:1200px;margin:40px auto;padding:0 20px}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px}.admin-header h1{margin:0}.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:0 20px}.table-responsive{overflow-x:auto}table{width:100%;border-collapse:separate;border-spacing:0;margin-top:10px}th,td{padding:16px;text-align:left;border-bottom:1px solid var(--border)}th{background-color:var(--light);font-weight:600;color:var(--gray);font-size:.9rem;text-transform:uppercase;letter-spacing:.5px}th:first-child{border-top-left-radius:8px}th:last-child{border-top-right-radius:8px}tbody tr:hover{background-color:var(--light)}.status-badge{padding:4px 10px;border-radius:999px;font-size:.8rem;font-weight:600;text-transform:uppercase}.status-avail{background-color:#d1fae5;color:#065f46}.status-used{background-color:#fee2e2;color:#991b1b}.delete-btn{background-color:transparent;color:var(--danger);border:1px solid var(--danger);padding:6px 12px;font-size:.8rem}.delete-btn:hover{background-color:var(--danger);color:#fff}