:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--text-primary: #f8fafc;--text-secondary: #94a3b8;--accent-primary: #3b82f6;--accent-secondary: #8b5cf6;--accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);--danger: #ef4444;--success: #10b981;--border-color: #334155;--radius-md: 12px;--radius-lg: 16px;--shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-md: 0 10px 15px -3px rgba(0, 0, 0, .3), 0 4px 6px -2px rgba(0, 0, 0, .15);--shadow-glow: 0 0 20px rgba(59, 130, 246, .15)}*{box-sizing:border-box;margin:0;padding:0;font-family:Cairo,sans-serif}body{background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh}.app-container{display:flex;min-height:100vh}.sidebar{width:260px;background-color:var(--bg-secondary);border-left:1px solid var(--border-color);display:flex;flex-direction:column;padding:1.5rem;position:sticky;top:0;height:100vh}.sidebar-header{margin-bottom:3rem;text-align:center}.sidebar-header h2{font-size:1.75rem;font-weight:800}.text-gradient{background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.sidebar-nav{display:flex;flex-direction:column;gap:.5rem}.nav-link{display:flex;align-items:center;gap:1rem;padding:1rem 1.25rem;color:var(--text-secondary);text-decoration:none;border-radius:var(--radius-md);transition:all .3s ease;font-weight:600;font-size:1.1rem}.nav-link:hover{background-color:var(--bg-tertiary);color:var(--text-primary)}.nav-link.active{background:var(--accent-gradient);color:#fff;box-shadow:var(--shadow-glow)}.main-content{flex:1;padding:2.5rem;max-width:calc(100vw - 260px);overflow-y:auto}.main-content.print-mode{padding:0;max-width:100%}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.page-header h1{font-size:2rem;font-weight:700;display:flex;align-items:center;gap:.75rem}.card{background-color:var(--bg-secondary);border-radius:var(--radius-lg);padding:2rem;border:1px solid var(--border-color);box-shadow:var(--shadow-md)}.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.5rem;margin-bottom:1.5rem}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-size:.95rem;color:var(--text-secondary);font-weight:600}.form-group input{padding:.75rem 1rem;border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:var(--bg-primary);color:var(--text-primary);font-size:1rem;transition:all .3s ease}.form-group input:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 3px #3b82f633}.btn{padding:.75rem 1.5rem;border-radius:var(--radius-md);border:none;font-size:1rem;font-weight:700;cursor:pointer;transition:all .3s ease;display:inline-flex;align-items:center;justify-content:center;gap:.5rem}.btn-primary{background:var(--accent-gradient);color:#fff;box-shadow:var(--shadow-glow)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 25px #3b82f64d}.btn-danger{background-color:var(--danger);color:#fff;padding:.5rem 1rem;font-size:.9rem}.btn-danger:hover{background-color:#dc2626}.btn-success{background-color:var(--success);color:#fff}.btn-success:hover{background-color:#059669}.table-container{overflow-x:auto;background-color:var(--bg-secondary);border-radius:var(--radius-lg);border:1px solid var(--border-color);margin-top:2rem}table{width:100%;border-collapse:collapse;text-align:right}th,td{padding:1.25rem 1rem;border-bottom:1px solid var(--border-color)}th{background-color:#0003;color:var(--text-secondary);font-weight:600;font-size:.95rem}tr:last-child td{border-bottom:none}tr:hover td{background-color:#ffffff05}.store-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem}.product-card{background-color:var(--bg-secondary);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-color);transition:all .3s ease;display:flex;flex-direction:column}.product-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-glow);border-color:var(--accent-primary)}.product-image-placeholder{height:180px;background:linear-gradient(45deg,var(--bg-tertiary),var(--bg-primary));display:flex;align-items:center;justify-content:center;color:var(--text-secondary)}.product-content{padding:1.5rem;flex:1;display:flex;flex-direction:column}.product-title{font-size:1.25rem;font-weight:700;margin-bottom:1rem}.product-specs{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1.5rem;flex:1}.spec-item{display:flex;align-items:center;gap:.5rem;font-size:.9rem;color:var(--text-secondary)}.product-footer{display:flex;justify-content:space-between;align-items:center;margin-top:auto;padding-top:1rem;border-top:1px solid var(--border-color)}.price{font-size:1.5rem;font-weight:800;color:var(--success)}.invoice-wrapper{background-color:#f3f4f6;color:#000;min-height:100vh;padding:2rem}.invoice-container{max-width:800px;margin:0 auto;border:1px solid #ccc;padding:3rem;background:#fff;border-radius:8px;box-shadow:0 4px 6px -1px #0000001a}.invoice-header{display:flex;justify-content:space-between;border-bottom:2px solid #000;padding-bottom:1rem;margin-bottom:2rem}.invoice-header h1{font-weight:800;margin-bottom:.5rem;color:#000}.invoice-details{margin-bottom:2rem;color:#333}.invoice-table{width:100%;border-collapse:collapse;margin-bottom:2rem}.invoice-table th,.invoice-table td{border:1px solid #ddd;padding:1rem;text-align:right;color:#000}.invoice-table th{background-color:#f8f9fa;font-weight:700}.invoice-total{text-align:left;font-size:1.5rem;font-weight:700;padding:1rem;background-color:#f8f9fa;border:1px solid #ddd;color:#000}.print-actions{text-align:center;margin-bottom:2rem}.tabs{background:var(--bg-tertiary);padding:.25rem;border-radius:var(--radius-md);display:inline-flex}.tab-btn{background:transparent;border:none;padding:.5rem 1rem;color:var(--text-secondary);font-weight:600;border-radius:calc(var(--radius-md) - 2px);cursor:pointer;transition:all .3s ease}.tab-btn.active{background:var(--bg-secondary);color:var(--text-primary);box-shadow:var(--shadow-sm)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal-content{background:var(--bg-secondary);padding:2rem;border-radius:var(--radius-lg);width:90%;max-width:500px;border:1px solid var(--border-color);box-shadow:var(--shadow-md);animation:modalIn .3s ease-out}@keyframes modalIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.text-danger{color:var(--danger);font-weight:700}@media print{.print-actions{display:none}.invoice-wrapper{padding:0;background:#fff}.invoice-container{border:none;padding:0;box-shadow:none}@page{margin:.5cm}}