body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: #fdfdfd;
    color: #333;
}

/* HEADER */
header {
    position: absolute;
    top: 10px;
    right: 50px;
    z-index: 10;
}
nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}
nav a {
    text-decoration: none;
    color: #fff; 
    font-size: 14px;
}

/* BANNER */
.banner {
    height: 500px;
    background: url("images/nen.jpg") center/cover;
    display: flex;
    justify-content: center;
    align-items: center;
}
.banner-content {
    text-align: center;
    color: white;
}
.banner h1 {
    font-family: 'Roboto', sans-serif;
    font-size: 50px;
    letter-spacing: 5px;
    margin-bottom: 5px;
}
.banner p {
    font-size: 18px;
    margin-bottom: 20px;
}
.btn-muasam {
    background: #000;
    color: white;
    padding: 8px 30px;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

/* DANH MỤC */
.category {
    display: flex;
    justify-content: center;
    gap: 50px;
    padding: 60px 0;
}
.category .item img {
    width: 250px;
    height: 150px;
    object-fit: cover;
}
.category p {
    text-align: left;
    color: #888;
    font-size: 14px;
    margin-top: 10px;
}

/* PHẦN SẢN PHẨM */
.products h2 {
    text-align: center;
    font-weight: 400;
    font-size: 24px;
    margin-bottom: 50px;
}

.product-container {
    max-width: 1000px;
    margin: 0 auto;
}

.product-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 80px;
}

.product-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 80px;
}

.right-align {
    flex-direction: row;
}

.left-align {
    flex-direction: row-reverse;
}

.product-img {
    flex: 1;
    text-align: center;
}

.product-img img {
    max-width: 350px;
}

.product-info {
    flex: 1;
    padding: 0 50px;
}

.color-name { font-size: 14px; margin-bottom: 5px; color: #555; }
.size-label { font-size: 12px; color: #888; margin-bottom: 10px; }

/* Các nút Size hình tròn */
.size-options {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}
.size-options span {
    width: 20px;
    height: 20px;
    border: 1px solid #ccc;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    cursor: pointer;
}

/* Nút Thanh toán đen nhỏ */
.btn-add, .btn-pay {
    background: #000; 
    color: #fff; 
    border: none;
    padding: 8px 20px;        /* tăng chút cho dễ bấm */
    font-size: 12px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
    transition: 0.3s;         /* hiệu ứng mượt */
}

.btn-add:hover, .btn-pay:hover {
    background: grey;
    color: black;
}