* {
    box-sizing: border-box; 
}

:root {
    /* Màu nền */
    --color-bg-card: #ffffff;
    --color-bg-featured: #a84646; /* Card nâu đỏ góc trên phải */ 
    /* Màu chữ */
    --color-text-heading: #1a1a1a;
    --color-text-body: #6b6b6b;
    --color-text-on-featured: #ffffff; 
    /* Màu icon */
    --color-icon: #a0522d; /* Nâu đỏ giống card featured */ 
    /* Màu border card */
    --color-border: #e1a7a7; 
    /* Màu button */
    --color-btn-bg: #ffffff;
    --color-btn-arrow: #1a1a1a; 
    --transition-speed: 0.5s;
}

body { 
    font-family: 'Inter', sans-serif;  
    padding: 0;
    margin: 0; 
    font-size: 0.9rem;
}

.learn-more{
    font-size: .8rem;
    color: #fff;
    font-weight: bold;
    display: inline-flex;
    text-decoration: none;
    gap: 7px;
    justify-content: center;
    align-items: center; 
    margin-bottom: 0;
    margin-top: 45px;
    margin-left: 5px;
    opacity: 0.8;
}

.arrow{
    border: 1.5px solid #fff;
    border-radius: 100%;
    padding: 5px; 
    display: inline-flex;
    align-items: center;
    justify-content: stretch;
} 

.card:hover .arrow:hover{
    background-color: #fff;
    color: var(--color-icon);
}

h3 {  
    font-family: 'Space Grotesk', sans-serif;  
    color: var(--color-text-heading);  
    font-size: 1.2rem;
    margin: 0;
    padding: 0;
}
 
.cards-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 50px 100px;
}

.card { 
    position: relative;
    overflow: hidden; 
    min-height: 250px;
    border: 1.5px solid #eee; 
    transition: all var(--transition-speed) ease;
}

.card img { 
    width: 100%;
    aspect-ratio: 4 / 3;
    position: relative;
    display: block;
}
 
.icon {    
    font-size: 50px;
    font-weight: 100;
    color: var(--color-icon); 
    transition: all var(--transition-speed) ease; 
    position: absolute;
    display: block; 
    top: 35px;  
    left: 35px; 
    opacity: 0.7;
}

.card:hover .icon{ 
    opacity: 0;
}

.overlay{
    position: absolute;
    background-color: white;
    opacity: 1;
    inset: 0; 
    transition: all var(--transition-speed) ease; 
}

.card:hover .overlay{
    opacity: 0.7;
    background-color: var(--color-bg-featured);
}

.card-content {
    position: absolute;
    inset: 0; 
    text-align: left;
    color: var(--color-text-body); 
    transition: all var(--transition-speed) ease; 
    margin: 20px;
    padding: 20px 10px;  
    transform: translateY(80px);
    border: 1px solid transparent;
} 

.card:hover .card-content {
    color: var(--color-text-on-featured);
    background-color: transparent;   
    border-color: var(--color-border);
    transform: translateY(0px);
}  

.card:hover .card-content h3{
    color: var(--color-text-on-featured);
}

.card:hover .card-content p{
    opacity: 0.8;
}

@media (max-width: 768px) {
    .cards-container {
        grid-template-columns: repeat(2, 1fr);
        padding: 30px 30px; 
    }

    .card{
        min-height: 280px;
    } 

    .card img{
        height: 100%;
    }
 
    .card-content{
        margin: 10px;
    }

    .learn-more{ 
        margin-left: 5px;
        margin-top: 20px;
    }
}

@media (max-width: 480px) {
    .cards-container {
        grid-template-columns: 1fr;
        padding: 20px 16px; 
    }

    .card{
        min-height: 300px;
    }

    .card img{
        height: 100%;
    }
}