:root{--primary-color: #007bff;--primary-hover: #0056b3;--success-color: #28a745;--success-hover: #218838;--danger-color: #dc3545;--danger-hover: #c82333;--secondary-color: #6c757d;--secondary-hover: #5a6268;--info-color: #17a2b8;--info-hover: #138496;--text-dark: #333;--text-muted: #6c757d;--border-light: #ddd;--border-lighter: #eee;--background-light: #f8f9fa;--white: #fff;--shadow: 0 2px 4px rgba(0, 0, 0, .1);--font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);color:var(--text-dark);background-color:var(--white)}.container{max-width:1200px;margin:0 auto;padding:20px}.navbar{display:flex;justify-content:space-between;align-items:center;background-color:var(--white);padding:0 20px;height:60px;box-shadow:var(--shadow)}.navbar-brand h2{margin:0;font-size:1.5rem;color:var(--text-dark)}.navbar-menu{display:flex;gap:20px}.navbar-item{color:var(--text-dark);text-decoration:none;padding:8px 16px;border-radius:4px;transition:background-color .3s}.navbar-item:hover,.navbar-item.active{background-color:var(--background-light)}.navbar-user{display:flex;align-items:center;gap:15px}.user-info{font-size:14px;color:var(--text-muted)}.btn{border:none;padding:10px 20px;border-radius:4px;cursor:pointer;font-size:14px;transition:background-color .3s}.btn-primary{background-color:var(--primary-color);color:var(--white)}.btn-primary:hover{background-color:var(--primary-hover)}.btn-success{background-color:var(--success-color);color:var(--white)}.btn-success:hover{background-color:var(--success-hover)}.btn-danger{background-color:var(--danger-color);color:var(--white)}.btn-danger:hover{background-color:var(--danger-hover)}.btn-secondary{background-color:var(--secondary-color);color:var(--white)}.btn-secondary:hover{background-color:var(--secondary-hover)}.btn-info{background-color:var(--info-color);color:var(--white)}.btn-info:hover{background-color:var(--info-hover)}.btn-close{background:none;border:none;font-size:24px;cursor:pointer;color:var(--text-muted)}.table-container{background:var(--white);border-radius:8px;overflow:hidden;box-shadow:var(--shadow)}table{width:100%;border-collapse:collapse}th,td{padding:12px;text-align:left;border-bottom:1px solid var(--border-lighter)}th{background-color:var(--background-light);font-weight:600}tr:hover{background-color:var(--background-light)}.modal{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000}.modal-content{background:var(--white);border-radius:8px;width:90%;max-width:500px;max-height:90vh;overflow-y:auto}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px;border-bottom:1px solid var(--border-lighter)}.modal-header h2{margin:0;font-size:1.5rem}.modal-body{padding:20px}.form-group{margin-bottom:15px}.form-group label{display:block;margin-bottom:5px;font-weight:500}.form-group input,.form-group select,.form-group textarea{width:100%;padding:8px 12px;border:1px solid var(--border-light);border-radius:4px;font-family:var(--font-family)}.form-group textarea{min-height:100px;resize:vertical}.form-row{display:flex;gap:20px;margin-bottom:15px}.form-row .form-group{flex:1}.form-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}.stat-card{background:var(--white);padding:20px;border-radius:8px;box-shadow:var(--shadow);text-align:center}.stat-card h3{margin:0 0 10px;color:var(--text-muted);font-size:14px;text-transform:uppercase}.stat-number{font-size:32px;font-weight:700}.search-box{position:relative;max-width:500px}.search-input{width:100%;padding:12px 16px;border:1px solid var(--border-light);border-radius:8px;font-size:16px}.search-results{position:absolute;top:100%;left:0;right:0;background:var(--white);border:1px solid var(--border-light);border-radius:8px;box-shadow:var(--shadow);z-index:100}.search-item{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:1px solid var(--border-lighter);cursor:pointer}.search-item:hover{background-color:var(--background-light)}.search-item:last-child{border-bottom:none}.item-code{font-weight:700;color:var(--primary-color);min-width:80px}.item-name{flex:1;margin:0 10px}.item-price{font-weight:700;color:var(--success-color);min-width:80px}.item-stock{font-size:12px;color:var(--text-muted);min-width:80px}.sale-footer{display:flex;justify-content:space-between;align-items:center;padding:20px;border-top:2px solid var(--border-lighter)}.total{font-size:24px;color:var(--text-dark)}.reportes-section{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(500px,1fr))}.report-card{background:var(--white);border-radius:8px;padding:20px;box-shadow:var(--shadow)}.report-card h2{margin:0 0 15px;font-size:1.5rem;font-weight:600;border-bottom:2px solid var(--primary-color);padding-bottom:8px}.no-data{background:var(--background-light);border:1px solid var(--border-lighter);border-radius:8px;padding:20px;text-align:center;color:var(--text-muted);font-style:italic}.login-container{max-width:400px;margin:50px auto;padding:20px;border:1px solid var(--border-light);border-radius:8px;text-align:center}.login-container h2{margin-bottom:20px;font-size:1.5rem}.login-container .error{color:var(--danger-color);margin-top:10px}.quantity-display{display:flex;flex-direction:column;align-items:center;gap:5px}.quantity{font-weight:700;font-size:16px}.radio-group{display:flex;flex-direction:column;gap:10px}.radio-option{display:flex;align-items:center;gap:8px;cursor:pointer}.radio-option input[type=radio]{margin:0}.loading{text-align:center;padding:40px;color:var(--text-muted)}@media (max-width: 768px){.container{padding:15px}.reportes-section,.stats-grid{grid-template-columns:1fr}}@media (max-width: 480px){.btn{padding:8px 16px;font-size:12px}th,td{padding:8px;font-size:.85rem}}