/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-navy: #1a3a52;
    --secondary-gray: #6c757d;
    --metallic-silver: #c0c0c0;
    --light-gray: #f4f6f8;
    --white: #ffffff;
    --accent-blue: #2c5f8d;
    --border-color: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Roboto', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-gray);
    color: #333;
    line-height: 1.6;
}

/* Header & Navigation */
.header {
    background: linear-gradient(135deg, var(--primary-navy), var(--accent-blue));
    color: var(--white);
    padding: 1rem 0;
    box-shadow: 0 2px 10px var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.nav-menu a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-navy), var(--accent-blue));
}

.login-box {
    background: var(--white);
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 400px;
}

.login-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo h1 {
    color: var(--primary-navy);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.login-logo p {
    color: var(--secondary-gray);
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary-navy);
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-navy), var(--accent-blue));
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow);
}

.btn-secondary {
    background-color: var(--secondary-gray);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-success {
    background-color: #28a745;
    color: var(--white);
}

.btn-success:hover {
    background-color: #218838;
}

.btn-danger {
    background-color: #dc3545;
    color: var(--white);
}

.btn-danger:hover {
    background-color: #c82333;
}

/* Product Grid */
.page-title {
    color: var(--primary-navy);
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.products-grid {
    display: grid;
    /*grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));*/
    gap: 2rem;
    margin-top: 2rem;
}

.product-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.product-image {
    width: 100%;
    height: 395px;
    object-fit: fill;
}

/*  Tablets and small laptops */
@media (max-width: 992px) {
    .product-image {
        height: 170px;
        object-fit: cover;
    }
}

/* Mobile phones */
@media (max-width: 576px) {
    .product-image {
        height: 140px;
        object-fit: cover;
    }
}
.product-info {
    padding: 1.5rem;
}

.product-name {
    color: var(--primary-navy);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.product-description {
    color: var(--secondary-gray);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* Product Details Page */
.product-details {
    background: var(--white);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px var(--shadow);
}

.product-header {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.product-image-large {
    flex: 1;
    min-width: 300px;
}

.product-image-large img {
    width: 100%;
    border-radius: 10px;
}

.product-main-info {
    flex: 1;
    min-width: 300px;
}

.selection-section {
    margin-bottom: 2rem;
}

.selection-section h3 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
}

.dn-selector {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    background-color: var(--white);
    cursor: pointer;
}

.pn-sections {
    display: grid;
    grid-template-columns: 1fr 1fr; /* exactly 2 equal columns for PN10 and PN16 */
    gap: 2rem;
    margin-top: 2rem;
}

.pn-selection {
    grid-column: 1 / -1; /* makes the radio buttons row span full width */
    background: #f8f9fa;
    padding: 1rem 1.5rem;
    border-radius: 10px;
    border: 1px solid #dee2e6;
}

    .pn-selection h4 {
        margin-bottom: 0.75rem;
        font-weight: 600;
    }

    .pn-selection .btn-group label {
        min-width: 100px;
        text-align: center;
        font-weight: 500;
        padding: 10px 20px;
        border-radius: 6px !important;
        transition: all 0.2s ease-in-out;
    }

        .pn-selection .btn-group label.active {
            background-color: #019CEC;
            color: #fff;
            border-color: #019CEC;
            box-shadow: 0 0 0 0.2rem rgba(1, 156, 236, 0.25);
        }

.pn-section {
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 1.5rem;
    background-color: var(--light-gray);
}

.pn-section h4 {
    color: var(--primary-navy);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.length-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.length-btn {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    background-color: var(--white);
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.length-btn:hover:not(:disabled) {
    border-color: var(--accent-blue);
    background-color: var(--accent-blue);
    color: var(--white);
}

.length-btn.selected {
    border-color: var(--accent-blue);
    background-color: var(--accent-blue);
    color: var(--white);
}

.length-btn:disabled {
    background-color: #e9ecef;
    color: #adb5bd;
    cursor: not-allowed;
    opacity: 0.6;
}

.weight-display {
    background-color: var(--white);
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    border: 2px solid var(--border-color);
}

.weight-display p {
    margin: 0;
    color: var(--primary-navy);
    font-weight: 600;
}

.quantity-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
}

.add-to-cart-section {
    margin-top: 2rem;
    text-align: center;
}

.validation-message {
    background-color: #fff3cd;
    border: 1px solid #ffc107;
    color: #856404;
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
    display: none;
}

/* Cart Page */
.cart-container {
    background: var(--white);
    border-radius: 10px;
    padding: 2rem;
    box-shadow: 0 5px 15px var(--shadow);
}

.order-section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background-color: var(--light-gray);
}

.order-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.order-header h3 {
    color: var(--primary-navy);
    margin: 0;
}

.cart-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
}

.cart-table th,
.cart-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.cart-table th {
    background-color: var(--primary-navy);
    color: var(--white);
    font-weight: 600;
}

.cart-table tr:hover {
    background-color: var(--light-gray);
}

.cart-table input[type="number"] {
    width: 80px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

.cart-total {
    text-align: right;
    margin-bottom: 2rem;
}

.cart-total h3 {
    color: var(--primary-navy);
    font-size: 1.5rem;
}

.cart-actions {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.empty-cart {
    text-align: center;
    padding: 3rem;
    color: var(--secondary-gray);
}

/* Animations and Transitions */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.product-card,
.product-details,
.cart-container {
    animation: fadeIn 0.5s ease-out;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus states for accessibility */
input:focus,
select:focus,
button:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* Loading state */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--secondary-gray);
}

/* Success message */
.success-message {
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(1, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
    }
    
    .nav-menu a {
        text-align: center;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .product-header {
        flex-direction: column;
    }

    .pn-sections {
        grid-template-columns: 1fr;
    }

    .cart-table {
        font-size: 0.85rem;
    }
    
    .cart-table th,
    .cart-table td {
        padding: 0.5rem;
    }

    .cart-actions {
        flex-direction: column;
    }
    
    .login-box {
        padding: 2rem;
        margin: 1rem;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .length-options {
        grid-template-columns: repeat(1, 1fr);
    }
    
    .cart-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
    
    .product-info {
        padding: 1rem;
    }
    
    .pn-section {
        padding: 1rem;
    }
}
/* --- Responsive Navbar Enhancement --- */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--white);
    cursor: pointer;
}

/* On tablets and phones */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
        position: absolute;
        top: 18px;
        right: 25px;
    }

    .nav-container {
        flex-direction: column;
        align-items: flex-start;
        position: relative;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        background: linear-gradient(135deg, var(--primary-navy), var(--accent-blue));
        border-top: 1px solid rgba(255, 255, 255, 0.2);
        margin-top: 1rem;
        padding: 1rem 0;
        border-radius: 0 0 10px 10px;
    }

        .nav-menu.show {
            display: flex;
        }

        .nav-menu a {
            width: 100%;
            text-align: center;
            padding: 0.75rem 0;
        }
}
input:focus, select:focus, button:focus {
    outline: transparent;
    outline-offset: 2px;
}