*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    color: #333333;
    background: #f5f7fa; /*body css*/
    line-height: 1.7;
}

header {
    color: white;
    background: #7cbcfc; /*header css*/
    padding: 1.25rem;
    text-align: center;
}

header h1 {
    font-size: 1.3rem; /*header h1 css*/
}

main {
    max-width: 1120px;
    padding: 1rem; /*main body css*/
    margin: 0 auto;
}

.card-area {
    display: grid;
    grid-template-columns: 1fr;/*card area css*/
    gap: 1rem;
    padding: 0; 
    margin: 0; 

}

.card {
    background: #fffffff5;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);/*card css*/
    padding: 1rem;
    border-radius: 12px;
}

.card h2 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.card p {
    color: #555;
    font-size: 0.95rem;/*card p css*/
}

/* buttons */
#act-btn {
    display: block;
    max-width: 1201;
    width: 100%; 
    background-color: #97cbecfd;
    border: none;
    border-radius: 8px;
    color: rgb(0, 0, 0);
    padding: 20px 40px; /* act buttons */

    text-align: left;
    font-size: 16px;
    margin: 4px 2px;
    text-decoration: none;
    display: inline-block;
    cursor: pointer;

}


.btn {
    display: inline-block;
    margin-top: 0.75rem;
    background: #5ca6e7fd;
    color: rgb(255, 255, 255);/* button*/
    padding: 0.5rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.8rem;
}

.btn:hover {
    opacity: 0.9;/* button hover*/
}

@media (max-width: 768px) {
    .site-nav {
        flex-direction: column;/*mobile adjustments*/
        gap: 20px;
    }

    .offer-container {
        flex-direction: column;
        align-items: center;
    }
}