*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
}
body{
    background-color: azure;
}
header{
    background-color: black;
    color: white;
    padding: 16px;
    text-align: center;
}
header h1{
    text-shadow: 5px 5px 3px gray;
}
nav{
    display: flex;
    justify-content: center;
    background-color: gray;
    padding: 10px;
}
nav a{
    color: whitesmoke;
    text-decoration: none;
    margin: 0 16px;
}
nav a:hover{
    color:aquamarine;   
}
ul{
    list-style-type: none;
}
ul li{
    display: inline-block;
    width: 150px;
    position: relative;
}
menu{
    border: 1px solid black;
}
.menusp{
    display: none;
    position: absolute;
    background-color: grey;
    min-width: 160px;
    list-style: none;
    padding: 0;
    margin: 0;
    border: 1px solid black;
}
.menusp li{
    padding-top: 2px;
    padding-bottom: 2px;
    border: 1px black;
    border-bottom: 1px solid black;
}
.menu li:hover .menusp{
    display: block;
}
.products{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    padding: 30px;
}
.product{
    background-color:white;
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    text-align: center;
}

.product h3{
    font-size: 16px;
    color: #111;
    margin-bottom: 8px;
    font-weight: bold;
}

.product p {
    color: #666;
    font-size: 14px;
    margin-bottom: 12px;
}

.product img{
    width: 100%;
    max-width: 180px;
    height: 160px;
    object-fit: contain;
    margin: 0 auto 12px auto;
    display: block;
}

.product button {
    background-color: lime; /* Màu xanh lá chuẩn */
    color: white;
    border: none;
    padding: 8px 18px;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s;
}

.product button:hover {
    background-color: #096931; /* Đổi màu nhẹ khi rê chuột */
}