* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', '微软雅黑', system-ui, sans-serif;
    background: #f5f9f0;  
    line-height: 1.5;
    color: #2c3e2c;
    padding-top: 80px;
    padding-right: 260px; 
    position: relative;
    min-height: 100vh;
}
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}
#main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(135deg, #2d5e3b 0%, #1e4620 100%);
    z-index: 1000;
    padding: 8px 0;
    border-bottom: 3px solid #c7b65e;
}
.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}
.logo-img {
    height: 48px;
    width: auto;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}
.logo-text {
    font-size: 26px;
    font-weight: bold;
    color: #f9f1d2;
    text-shadow: 2px 2px 0 #2d4a2d;
    letter-spacing: 2px;
}
.logo-title {
    font-size: 26px;
    font-weight: 700;
    color: #f3e9c0;
    margin-left: 5px;
}
.main-nav .nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}
.main-nav .nav-list li {
    float: left;
    margin: 0 4px;
}
.main-nav .nav-list li a {
    display: inline-block;
    padding: 10px 20px;
    color: #f7f3dd;
    font-weight: 600;
    text-decoration: none;
    border-radius: 30px;
    background: rgba(255,255,240,0.08);
    transition: all 0.2s;
    border: 1px solid transparent;
    cursor: pointer; 
}
.main-nav .nav-list li a:hover {
    color: #1e3a1e;
    border-color: #efdb9b;
}
.main-nav {
    overflow: hidden;
}
.main-wrapper {
    max-width: 1300px;
    margin: 20px auto 10px;
    padding: 0 20px;
}
.left-sidebar {
    float: left;
    width: 220px;
    margin-right: 25px;
    position: relative;  
    top: 0;
    left: 0;
    padding: 16px 12px;
    background: #ffffffdb;
    backdrop-filter: blur(4px);
    background: linear-gradient(145deg, #fafff7, #e6f0e2);
    border-radius: 20px;
    border: 1px solid #c8d9b8;
    margin-bottom: 30px;
}
.sidebar-card h3 {
    font-size: 1.4rem;
    border-bottom: 2px dashed #7f9a6b;
    padding-bottom: 10px;
    margin-bottom: 15px;
    color: #2b5329;
}
.category-nav {
    list-style: none;
}
.category-nav li {
    margin: 8px 0;
    padding: 6px 8px;
    border-radius: 30px;
    transition: background 0.2s;
    cursor: default;
    border-left: 4px solid transparent;
}
.category-nav li:hover {
    background: transparent;
    border-left-color: transparent;
    padding-left: 8px;
}
.category-nav li a {
    text-decoration: none;
    color: #2c472c;
    font-weight: 500;
    display: block;
}
.season-tip {
    margin-top: 25px;
    background: #f1e9d2;
    padding: 12px 10px;
    border-radius: 18px;
    color: #3d5e2b;
    font-weight: bold;
    border: 1px solid #b7b97a;
    position: relative;
    left: 4px;      
    cursor: default;
}
.middle-content {
    float: left;
    width: calc(100% - 245px); 
    margin-bottom: 30px;
}
.section-title {
    font-size: 1.6rem;
    margin: 25px 0 18px;
    color: #2b5e2b;
    border-left: 12px solid #86a86b;
    padding-left: 20px;
    background: linear-gradient(to right, #f3f9ec, transparent);
}
.book-grid {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
.book-card {
    background: white;
    border-radius: 24px;
    padding: 18px 12px 16px;
    flex: 1 1 160px;
    min-width: 150px;
    text-align: center;
    border: 1px solid #f4f6f2;
    transition: transform 0.2s;
    position: relative;
    cursor: pointer;
}
.book-card:hover {
    filter: brightness(0.9);
}
.book-cover {
    padding: 18px 5px;
    border-radius: 20px;
    margin-bottom: 12px;
    border: 1px solid #fcfdfbc3;
}
.cover-text {
    display: block;
    font-weight: bold;
    margin-top: 6px;
    color: #3f6132;
}
.book-card {
    position: relative;
    background: #ffffff;
    border-radius: 16px;
    padding: 20px 16px;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.05);
    border: 1px solid #eee;
    text-align: center;
    transition: box-shadow 0.2s;
    cursor: pointer;
    min-width: 180px;
    flex: 1 1 160px;
}
.book-cover {
    background: #f8f9fa;
    padding: 24px 8px;
    border-radius: 12px;
    margin-bottom: 16px;
    border: 1px solid #e9ecef;
}
.book-cover i {
    font-size: 40px;
    color: #3d6b3d;
    margin-bottom: 8px;
}
.cover-text {
    display: block;
    font-weight: 700;
    font-size: 1.3rem;
    color: #2c3e50;
}
.book-card h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 8px 0 4px;
    color: #1e2b3a;
}
.book-card .author {
    color: #6c757d;
    font-size: 0.9rem;
}
.hover-info {
    display: none;              
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px dashed #ddd;
    text-align: left;
}
.book-card:hover .hover-info {
    display: block;           
}
.hover-info .price {
    font-size: 1.8rem;
    font-weight: 800;
    color: #c8232c;
    margin-bottom: 8px;
}
.hover-info .author-line {
    color: #555;
    margin-bottom: 16px;
}
.hover-info .buy-btn {
    display: inline-block;
    width: 100%;
    background: #1e3a5f;
    color: white;
    text-align: center;
    padding: 12px 0;
    border-radius: 40px;
    font-weight: 700;
    text-decoration: none;
}
.hover-info .buy-btn:hover {
    background: #112a44;
}
.book-table {
    width: 100%;
    border-collapse: collapse;
    background: #fdfdf5;
    border-radius: 20px;
    overflow: hidden;
    margin: 10px 0 20px;
    border: 1px solid #b2c8a2;
}
.book-table th {
    background: #f6f7f5;
    color: #0c0c0c;
    padding: 14px 10px;
    font-weight: 600;
    text-align: left;
}
.book-table td {
    padding: 12px 10px;
    border-bottom: 1px solid #d0dec2;
}
.book-table tbody tr:hover {
    background: #edf5e4;
    cursor: pointer;
}
.table-note {
    text-align: right;
    color: #4f6b3a;
    font-style: italic;
}
.right-fixed-ad {
    position: fixed;
    right: 20px;
    top: 120px;
    width: 230px;
    z-index: 500;
}
.ad-card {
    background: #fcf9e9;
    border-radius: 28px;
    padding: 18px 14px;
    margin-bottom: 20px;
    border: 2px solid #cbb77a;
    backdrop-filter: blur(8px);
    background: rgba(255, 251, 230, 0.95);
    transition: transform 0.2s;
    cursor: default;
}
.ad-header {
    font-size: 1.4rem;
    font-weight: bold;
    color: #a1561c;
    border-bottom: 2px dotted #c0a86a;
    padding-bottom: 8px;
    margin-bottom: 12px;
}
.ad-main {
    font-size: 1.2rem;
    color: #3b6120;
}
.ad-main strong {
    font-size: 1.8rem;
    color: #c4470c;
}

.ad-coupon {
    background: #1f3a1f;
    padding: 10px;
    border-radius: 50px;
    color: #ffecb3;
    margin: 15px 0;
    text-align: center;
    cursor: pointer;
}
.coupon-code {
    font-weight: 800;
    letter-spacing: 2px;
    font-size: 1.2rem;
}
.more-deals {
    margin-top: 10px;
    background: #dac292;
    padding: 8px;
    border-radius: 30px;
    text-align: center;
    font-weight: 600;
    cursor: pointer;
    position: relative;
}
.hover-more {
    display: none;
    background: #3e5e2e;
    color: #f9efc7;
    padding: 6px 10px;
    border-radius: 30px;
    margin-left: 6px;
    font-size: 0.8rem;
}
.more-deals:hover .hover-more {
    display: inline-block;
}
.fake-btn {
    background: #7e9f5c;
    border: none;
    color: white;
    padding: 10px 16px;
    border-radius: 36px;
    font-weight: bold;
    width: 100%;
    margin-top: 12px;
    border: 1px solid #aacf8e;
    transition: 0.15s;
}
.fake-btn:hover {
    background: #5f8244;
}
@media screen and (max-width: 1000px) {
    body { padding-right: 20px; }
    .right-fixed-ad { display: none; } 
}