/* Main Content */
.main-container {
    display: flex;
    flex-direction: column;
    padding: 15px;
    gap: 20px;
    margin-top: 30px !important;
}

/* Sidebar */
.sidebar {
    width: 100%;
    padding-right: 0;
    margin-bottom: 20px;
}

.sidebar h3 {
    margin: 15px 0 10px;
    color: #666;
    font-weight: normal;
}

.sidebar ul {
    list-style-type: none;
    margin-left: 20px;
}

.sidebar li {
    margin-bottom: 8px;
    color: #666;
}

.sidebar li::before {
    content: "•";
    margin-right: 8px;
    color: #666;
}

.show-all {
    margin-top: 10px;
    color: #666;
}

/* Book Grid */
.book-grid {
    display: grid;
    grid-template-columns: repeat(
        auto-fill,
        minmax(180px, 1fr)
    );
    gap: 20px;
    justify-content: center;
}

.book-card {
    background-color: white;
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    width: 180px;
    margin: 0 auto;
}

.book-image {
    width: 100%;
    height: 180px;
    background-color: #eee;
    object-fit: cover;
    padding: 15px;
}

.book-details {
    padding: 12px;
}

.book-format {
    font-size: 12px;
    color: #999;
    margin-bottom: 5px;
}

.book-title {
    font-weight: bold;
    margin-bottom: 5px;
}

.book-author {
    font-size: 14px;
    color: #666;
    margin-bottom: 8px;
}

.book-price {
    color: #d5b036;
    font-weight: bold;
    margin-bottom: 12px;
}

.add-to-cart {
    background-color: #0a2f3c;
    color: white;
    border: none;
    padding: 8px 0;
    width: 100%;
    border-radius: 3px;
    cursor: pointer;
    font-size: 14px;
}

/* Media Queries for Responsive Design */
/* Tablet */
@media screen and (min-width: 768px) {
    header {
        padding: 15px 30px;
    }

    .logo {
        margin-bottom: 0;
    }

    .main-container {
        flex-direction: row;
        padding: 20px;
    }

    .sidebar {
        width: 250px;
        padding-right: 20px;
    }

    .book-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
        flex: 1;
    }

    .book-image {
        height: 200px;
    }
}

/* Desktop */
@media screen and (min-width: 1024px) {
    header {
        padding: 15px 40px;
    }

    nav {
        gap: 40px;
    }

    nav a {
        font-size: 18px;
        padding: 10px;
    }

    .auth-btn {
        padding: 10px 30px;
    }

    .book-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 40px;
    }

    .book-image {
        height: 220px;
        padding: 20px;
    }
}

/* Large Desktop */
@media screen and (min-width: 1440px) {
    .book-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 50px;
    }
}