/* 继承基础样式 */
body {
    margin: 0;
    padding: 0;
    font-family: "Microsoft YaHei", sans-serif;
    background: #f5f5f5;
}

/* 页头样式 */
header {
    background: #fff;
    padding: 20px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo {
    width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo h1 {
    margin: 0;
    color: #333;
    font-size: 32px;
}

/* 导航样式 */
nav {
    width: 1200px;
    margin: 20px auto 0;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

nav li {
    margin: 0 20px;
}

nav a {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    padding: 5px 10px;
}

nav a:hover {
    color: #e74c3c;
}

/* 内容区样式 */
main {
    width: 1200px;
    margin: 20px auto;
    background: #fff;
    padding: 20px;
    border-radius: 5px;
}

/* 导航路径 */
.breadcrumb {
    padding: 10px 0;
    color: #666;
}

.breadcrumb a {
    color: #666;
    text-decoration: none;
}

.breadcrumb a:hover {
    color: #e74c3c;
}

/* 商品详情 */
.product-detail {
    display: flex;
    gap: 40px;
    margin: 20px 0;
}

.product-gallery {
    width: 400px;
}

.main-img {
    width: 100%;
    height: 560px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 10px;
}

.thumb-list {
    display: flex;
    gap: 10px;
}

.thumb-list img {
    width: 80px;
    height: 112px;
    object-fit: cover;
    border-radius: 3px;
    cursor: pointer;
}

.product-info {
    flex: 1;
}

.product-info h2 {
    margin: 0 0 20px;
    font-size: 24px;
    color: #333;
}

.author-info,
.publisher,
.publish-date {
    margin: 10px 0;
    color: #666;
}

.price-info {
    margin: 20px 0;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 5px;
}

.price {
    font-size: 28px;
    color: #e74c3c;
    font-weight: bold;
}

.original-price {
    color: #999;
    text-decoration: line-through;
    margin: 5px 0;
}

.discount {
    display: inline-block;
    padding: 2px 8px;
    background: #e74c3c;
    color: #fff;
    border-radius: 3px;
    font-size: 14px;
}

.buy-btns {
    margin-top: 30px;
}

.btn-buy,
.btn-cart {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 5px;
    text-decoration: none;
    margin-right: 15px;
}

.btn-buy {
    background: #e74c3c;
    color: #fff;
}

.btn-cart {
    background: #f5f5f5;
    color: #333;
}

/* 详细信息标签页 */
.detail-tabs {
    margin-top: 40px;
}

.tab-header {
    display: flex;
    border-bottom: 2px solid #e74c3c;
}

.tab-header a {
    padding: 10px 30px;
    color: #333;
    text-decoration: none;
    border-radius: 5px 5px 0 0;
}

.tab-header a.active {
    background: #e74c3c;
    color: #fff;
}

.tab-content {
    padding: 20px;
    background: #fff;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.tab-pane h3 {
    margin-top: 0;
    color: #333;
}

/* 目录列表 */
.catalog-list {
    list-style: none;
    padding: 0;
}

.catalog-list li {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}

/* 评论列表 */
.comment-item {
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.comment-item .user {
    color: #666;
}

.comment-item .stars {
    color: #f1c40f;
    margin: 5px 0;
}

/* 相关推荐 */
.related {
    margin-top: 40px;
}

.related h3 {
    color: #333;
    border-bottom: 2px solid #e74c3c;
    padding-bottom: 10px;
}

.book-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 20px;
}

.book-item {
    text-align: center;
}

.book-item img {
    width: 200px;
    height: 280px;
    object-fit: cover;
    border-radius: 5px;
}

.book-item h4 {
    margin: 10px 0;
    font-size: 16px;
}

.book-item .price {
    color: #e74c3c;
    font-weight: bold;
}

/* 页脚样式 */
footer {
    background: #333;
    color: #fff;
    padding: 30px 0;
    text-align: center;
    margin-top: 50px;
}

.footer-nav {
    margin-bottom: 20px;
}

.footer-nav a {
    color: #fff;
    text-decoration: none;
    margin: 0 10px;
}

.copyright {
    font-size: 14px;
    color: #999;
}