body {
    margin: 0;
    padding: 0;
    background-color: var(--color-bg-light);
    font-family: Arial, Helvetica, sans-serif;
}

a {
    text-decoration: none;
}

.page-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    background-color: var(--color-bg-primary);
    box-shadow: 0 0 10px var(--color-shadow-light);
}

.container {
    margin: 0 auto;
    padding: 20px 20px;
    max-width: 900px;
    min-height: 100vh;
}

@media (max-width: 500px) {
    .container {
    padding: 20px 10px;
    }
}

.header-style {
    text-align: center;
    font-size: 24px;
    margin-bottom: 10px;
}

hr {
    width: 100%;
    margin: 10px auto 10px auto;
}

.sheet-frame {
    width: 100%;
    height: 800px;
    border: none;
    overflow: hidden;
    display: block;
    max-width: 100%;
    margin: 20px auto;
}

/* footer */

.footer {
    display: flex;
    flex-wrap: nowrap;
    justify-content: space-between;
    align-items: flex-start;
    background-color: var(--color-bg-footer);
    padding: 20px;
    font-family: sans-serif;
}

.footer-left,
.footer-right {
    padding: 20px;
    box-sizing: border-box;
}

.footer-left {
    width: 60%;
}

.footer-right {
    width: 40%;
}

.footer-left h1,
.footer-right h1 {
    font-size: 20px;
    margin: 0 0 10px 0;
    color: var(--color-text-heading);
}

.footer-left hr,
.footer-right hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 0 0 10px 0;
    width: 100%;
}

.footer-left p {
    margin: 0;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.social-icons {
    display: flex;
    gap: 10px;
}

.social-icons a img {
    width: 30px;
    height: 30px;
    object-fit: cover;
    transition: opacity 0.3s;
    cursor: pointer;
    background-color: white;
    border-radius: 8px;
}

.social-icons a img:hover {
    opacity: 0.6;
}

@media (max-width: 768px) {
    .footer {
    flex-wrap: wrap;
    }

    .footer-left,
    .footer-right {
    width: 100%;
    }
}

/* Favorites section */
.favorites-section {
    max-width: 1000px;
    margin: 30px auto;
    padding: 10px 20px 30px 20px;
}

.favorites-title {
    text-align: left;
    font-size: 20px;
    margin: 10px 0 14px 0;
}

.favorites-category {
    margin-bottom: 22px;
}

.favorites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 25px;
    align-items: start;
}

.favorite-card {
    width: 100%;
    aspect-ratio: 2 / 3;
    overflow: hidden;
    border-radius: 6px;
    background-color: #eee;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.favorite-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.favorites-list {
    display: grid;
    gap: 2px;
    padding: 4px;
}

.favorites-list-item {
    display: grid;
    grid-template-columns: minmax(180px, 1fr) 2fr;
    gap: 8px;
    padding: 4px 0;
}

.favorites-list-author {
    font-weight: bold;
    color: #777;
}

.favorites-list-title {
    color: #555;
}

@media (min-width: 900px) {
    .favorites-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 600px) and (max-width: 899px) {
    .favorites-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 599px) {
    .favorites-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .favorites-list-item {
        grid-template-columns: 1fr;
        gap: 4px;
    }
}