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

body {
    font-family: Arial, sans-serif;
    background-color: #f8f8f8;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #2b2e83; 
    padding: 10px 20px;
    color: white;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.navbar ul {
    list-style: none;
    display: flex;
    gap: 15px;
}

.navbar ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

.product-container {
    display: flex;
    max-width: 1500px;
    border: 4px solid #119ebd;
    padding: 20px;
    gap: 20px;
    margin: 20px auto;
    align-items: center;
    text-align: center;
}

.product-image {
    flex: 1;
}

.product-image img {
    width: 100%;
    height: auto;
}

.product-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.product-title {
    font-size: 24px;
    font-weight: bold;
    margin: 0;
}

.product-price {
    color: #333;
    font-size: 20px;
    margin: 10px 0;
}

.size-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin: 10px 0;
}

.size-option {
    padding: 10px;
    border: 1px solid #ddd;
    text-align: center;
    cursor: pointer;
}

.size-option:hover {
    background-color: #f0f0f0;
    border: 1px solid #333;
}

.size-option.selected {
    background-color: #333;
    color: white;
    border: 1px solid #333;
}

.buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    width: 100%;
}

.add-to-bag, .favourite {
    flex: 1;
    padding: 15px;
    border: none;
    font-size: 16px;
    cursor: pointer;
}

.add-to-bag {
    background-color: black;
    color: white;
}

.favourite {
    background-color: white;
    color: black;
    border: 1px solid #ddd;
}

.promotion-note {
    color: #888;
    font-size: 14px;
    margin-top: 10px;
}

.footer {
    background-color: #2b2e83;
    color: white;
    text-align: center;
    padding: 20px;
}