/* RESET & BASE */
* {box-sizing: border-box;}

body { 
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
}

/* HEADER STYLES */
.header {
    overflow: hidden;
    background-color: #5490c4;
    padding: 20px 10px;
}

.header a {
    float: left;
    color: black;
    text-align: center;
    padding: 12px;
    text-decoration: none;
    font-size: 18px; 
    line-height: 25px;
    border-radius: 4px;
}

.header a.logo {
    font-size: 25px;
    font-weight: bold;
    color: white;
}

.header a:hover {
    background-color: #ddd;
    color: black;
}

/* Class active cho Navigation Link */
.header a.active {
    background-color: dodgerblue;
    color: white;
}

.header-right {
    float: right;
}

/* FOOTER STYLES */
.footer {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100%;
    background-color: #18622d;
    color: white;
    text-align: center;
    padding: 10px 0;
    z-index: 100; /* Đảm bảo footer nằm trên cùng */
}

/* RESPONSIVE HEADER */
@media screen and (max-width: 500px) {
    .header a {
        float: none;
        display: block;
        text-align: left;
    }
    
    .header-right {
        float: none;
    }
}

/* COLUMN/GRID STYLES */
/* Thiết lập mặc định cho Grid View, có thể thay đổi bằng JS */
.column {
    float: left;
    width: 50%;
    padding: 10px;
    transition: width 0.3s ease-in-out; 
}

/* Clear floats after the rows */
.row:after {
    content: "";
    display: table;
    clear: both;
}

/* CARD STYLES */
.card {
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
    transition: 0.3s;
    width: 300px;
    display: inline-block;
    margin: 15px;
    vertical-align: top;
}

.card:hover {
    box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2);
}

.card img {
    height: 150px; 
    background-color: #e9ecef; /* Placeholder color */
    width: 100%;
}

.card .container {
    padding: 2px 16px;
}

/* BUTTON STYLES (VIEW TOGGLE) */
.btn {
    border: none;
    outline: none;
    padding: 12px 16px;
    background-color: #f1f1f1;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn:hover {
    background-color: #ddd;
}

.btn.active {
    background-color: #666;
    color: white;
}