:root {
            --primary-color: #1a3b5d;
            --secondary-color: #6c757d;
            --success-color: #28a745;
            --danger-color: #dc3545;
            --warning-color: #ffc107;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
        }
        
        body {
            background-color: #f5f5f5;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        .nav {
            justify-content: center;
            align-items: center;
        }
        .navbar-brand {
            font-weight: 600;
            font-size: 1.5rem;
            color: var(--primary-color);
        }
        
        .main-container {
            padding: 20px;
            min-height: calc(100vh - 136px);
        }
        
        .search-card {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            margin-bottom: 30px;
            border: none;
        }
        
        .search-card .card-header {
            background-color: var(--primary-color);
            color: white;
            padding: 20px;
            border-bottom: none;
        }
        
        .search-card .card-title {
            margin-bottom: 0;
            font-weight: 600;
        }
        
        .search-card .card-body {
            padding: 30px;
        }
        
        .search-tabs .nav-link {
            color: var(--secondary-color);
            font-weight: 500;
            padding: 12px 20px;
            border-radius: 10px;
            margin-right: 10px;
            transition: all 0.3s ease;
        }
        
        .search-tabs .nav-link.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .search-tabs .nav-link:hover:not(.active) {
            background-color: rgba(26, 59, 93, 0.1);
        }
        
        .search-form {
            margin-top: 20px;
        }
        
        .form-label {
            font-weight: 500;
            color: var(--dark-color);
        }
        
        .form-control {
            border-radius: 10px;
            padding: 12px 15px;
            border: 1px solid #ced4da;
            transition: all 0.3s ease;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 59, 93, 0.25);
        }
        
        .search-btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 10px;
            padding: 12px 25px;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .search-btn:hover {
            background-color: #142e48;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(26, 59, 93, 0.3);
        }
        
        .captcha-container {
            background-color: #f8f9fa;
            border-radius: 10px;
            padding: 15px;
            margin-bottom: 20px;
            border: 1px dashed #ced4da;
        }
        
        .captcha-image {
            background-color: white;
            padding: 10px;
            border-radius: 8px;
            border: 1px solid #ced4da;
            text-align: center;
            font-size: 1.5rem;
            font-weight: bold;
            letter-spacing: 5px;
            color: var(--dark-color);
            position: relative;
            overflow: hidden;
            user-select: none;
        }
        
        .captcha-image::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(45deg, transparent 45%, #e9ecef 45%, #e9ecef 55%, transparent 55%);
        }
        
        .captcha-image::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle, transparent 30%, rgba(0, 0, 0, 0.03) 30%);
            background-size: 5px 5px;
        }
        
        .refresh-captcha {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: 8px;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
        }
        
        .refresh-captcha:hover {
            background-color: #5a6268;
            transform: rotate(180deg);
        }
        
        .result-card {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            margin-bottom: 30px;
            border: none;
            display: none;
        }
        
        .result-card .card-header {
            background-color: var(--primary-color);
            color: white;
            padding: 20px;
            border-bottom: none;
        }
        
        .result-card .card-title {
            margin-bottom: 0;
            font-weight: 600;
        }
        
        .result-card .card-body {
            padding: 0;
        }
        
        .warranty-info {
            padding: 30px;
        }
        
        .warranty-header {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }
        
        .warranty-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: #f0f4f9;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
        }
        
        .warranty-icon i {
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        
        .warranty-title {
            flex: 1;
        }
        
        .warranty-title h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--dark-color);
            margin-bottom: 5px;
        }
        
        .warranty-title p {
            color: var(--secondary-color);
            margin-bottom: 0;
        }
        
        .warranty-status {
            padding: 8px 15px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
        }
        
        .warranty-status.active {
            background-color: rgba(40, 167, 69, 0.1);
            color: var(--success-color);
        }
        
        .warranty-status.inactive {
            background-color: rgba(220, 53, 69, 0.1);
            color: var(--danger-color);
        }
        
        .warranty-status i {
            margin-right: 5px;
        }
        
        .warranty-details {
            background-color: #f8f9fa;
            border-radius: 10px;
            padding: 20px;
            margin-top: 20px;
        }
        
        .warranty-detail-row {
            display: flex;
            margin-bottom: 15px;
            align-items: center;
        }
        
        .warranty-detail-row:last-child {
            margin-bottom: 0;
        }
        
        .warranty-detail-label {
            width: 180px;
            font-weight: 500;
            color: var(--secondary-color);
        }
        
        .warranty-detail-value {
            flex: 1;
            font-weight: 500;
            color: var(--dark-color);
        }
        
        .days-remaining {
            background-color: var(--primary-color);
            color: white;
            border-radius: 10px;
            padding: 20px;
            margin-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .days-remaining-text {
            font-weight: 500;
        }
        
        .days-remaining-count {
            font-size: 1.8rem;
            font-weight: 700;
        }
        
        .days-remaining.expired {
            background-color: var(--danger-color);
        }
        
        .days-remaining.warning {
            background-color: var(--warning-color);
            color: #212529;
        }
        
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 20px 0;
            margin-top: 40px;
        }
        
        .footer a {
            color: #fff;
            text-decoration: none;
            margin: 0 10px;
        }
        
        .footer a:hover {
            text-decoration: underline;
        }
        
        .error-message {
            display: none;
            color: var(--danger-color);
            background-color: rgba(220, 53, 69, 0.1);
            border-radius: 10px;
            padding: 15px;
            margin-top: 20px;
            text-align: center;
            font-weight: 500;
        }
        
        /* Multi-product list styles */
        .customer-info-header {
            background-color: #f0f4f9;
            border-radius: 10px;
            padding: 20px;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
        }
        
        .customer-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin-right: 15px;
        }
        
        .customer-details {
            flex: 1;
        }
        
        .customer-name {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--dark-color);
            margin-bottom: 5px;
        }
        
        .customer-id {
            color: var(--secondary-color);
            font-size: 0.9rem;
        }
        
        .product-list {
            margin-top: 20px;
        }
        
        .product-card {
            border-radius: 10px;
            border: 1px solid #e9ecef;
            overflow: hidden;
            margin-bottom: 15px;
            transition: all 0.3s ease;
            background-color: white;
        }
        
        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        .product-card-header {
            padding: 15px;
            border-bottom: 1px solid #e9ecef;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .product-icon {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            background-color: #f0f4f9;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
        }
        
        .product-icon i {
            font-size: 1.2rem;
            color: var(--primary-color);
        }
        
        .product-info {
            flex: 1;
        }
        
        .product-name {
            font-weight: 600;
            color: var(--dark-color);
            margin-bottom: 5px;
        }
        
        .product-serial {
            color: var(--secondary-color);
            font-size: 0.85rem;
        }
        
        .product-card-body {
            padding: 15px;
            display: flex;
            flex-wrap: wrap;
        }
        
        .product-detail {
            width: 50%;
            padding: 5px 10px;
        }
        
        .product-detail-label {
            color: var(--secondary-color);
            font-size: 0.85rem;
            margin-bottom: 3px;
        }
        
        .product-detail-value {
            font-weight: 500;
            color: var(--dark-color);
        }
        
        .product-card-footer {
            padding: 15px;
            border-top: 1px solid #e9ecef;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .product-days-remaining {
            font-weight: 500;
        }
        
        .product-days-count {
            font-weight: 700;
            margin-left: 5px;
        }
        
        .product-days-count.active {
            color: var(--success-color);
        }
        
        .product-days-count.warning {
            color: var(--warning-color);
        }
        
        .product-days-count.expired {
            color: var(--danger-color);
        }
        
        .view-details-btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 8px;
            padding: 8px 15px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
        }
        
        .view-details-btn i {
            margin-left: 5px;
        }
        
        .view-details-btn:hover {
            background-color: #142e48;
            color: white;
        }
        
        .back-to-list-btn {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: 8px;
            padding: 8px 15px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            margin-bottom: 20px;
        }
        
        .back-to-list-btn i {
            margin-right: 5px;
        }
        
        .back-to-list-btn:hover {
            background-color: #5a6268;
            color: white;
        }
        
        .multi-product-result {
            display: none;
        }
        
        .single-product-result {
            display: none;
        }

        .form-control:focus {
            box-shadow: none !important;
        }
        
        @media (max-width: 767.98px) {
            .nav {
                flex-direction: column;
                gap: 8px;
            }
            .nav-item {
                min-width: 265px;
            }
            .nav-link{
                width: 100%;
            }
            .warranty-header {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .warranty-icon {
                margin-bottom: 15px;
            }
            
            .warranty-status {
                margin-top: 15px;
            }
            
            .warranty-detail-row {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .warranty-detail-label {
                width: 100%;
                margin-bottom: 5px;
            }
            
            .product-detail {
                width: 100%;
            }
            
            .product-card-footer {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .view-details-btn {
                margin-top: 10px;
            }

            .days-remaining {
                flex-direction: column;
            }
        }

        @media (min-width: 1200px){
            .container {
                max-width: 960px !important;
            }
        }

        @media (min-width: 1400px){
            .container {
                max-width: 960px !important;
            }
        }


        .loader-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.6); /* Yarı saydam siyah */
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999;
        }
        
        /* Loader Spinner - Yuvarlak yükleyici */
        .loader-spinner {
            width: 60px;
            height: 60px;
            border: 5px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: #fff;
            animation: spin 1s ease-in-out infinite;
        }
        
        .hidden {
            display: none;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }

        .page-header {
            text-align: center;
            padding: 20px 0;
        }

        .header-logo {
            width: 100%;
            max-width: 220px;
            height: auto;
        }