.grid {
    display: grid;
    gap: 20px;
    max-width: 1000px;
    margin: 0 auto;
}

.card {
    text-decoration: none;
    background-color: #ffffff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: transform 0.2s, box-shadow 0.2s;
    height: 300px;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.25);
}

.card img {
    width: 100%;
    height: 70%;
    object-fit: cover;
}

.card p {
    height: 30%;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: green;
    color: white;
    font-weight: bold;
}

.daily-tip {
    background-color: #f5f5dc;
    max-width: 900px;
    margin: 40px auto;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.daily-tip .subtitle {
    font-size: 1.6em;
    color: #004d40;
}


.sidebar-ad {
    position: fixed;
    top: 150px;
    right: 20px;
    width: 250px;
    background-color: #f5f5dc;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.sidebar-ad img {
    width: 100%;
}

.sidebar-ad h4 {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: rgba(0,0,0,0.5);
    color: white;
    padding: 5px 10px;
    border-radius: 5px;
}

footer {
    background-color: #d0c5b3;
    text-align: center;
    padding: 15px;
}

@media (max-width: 700px) {

    .header-row {
        flex-direction: column;
    }

    .login {
        position: static;
    }

    .sidebar-ad {
        display: none;
    }

    .grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 701px) and (max-width: 1000px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1001px) {
    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}