/* 基础样式 */
        :root {
            --primary-color: #6a0dad;
            --primary-dark: #4b0082;
            --primary-light: #9b59b6;
            --secondary-color: #2c3e50;
            --background-dark: #1a1a1a;
            --background-light: #2d2d2d;
            --text-color: #f5f5f5;
            --text-light: #b3b3b3;
            --accent-color: #e74c3c;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--background-dark);
            color: var(--text-color);
            line-height: 1.6;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        a {
            text-decoration: none;
            color: var(--text-color);
            transition: all 0.3s ease;
        }

        a:hover {
            color: var(--primary-light);
        }

        .btn {
            display: inline-block;
            padding: 10px 20px;
            border-radius: 4px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--primary-light);
            margin-right: 10px;
        }

        .btn-login:hover {
            background: rgba(155, 89, 182, 0.2);
        }

        .btn-register {
            background: var(--primary-color);
            border: 1px solid var(--primary-color);
        }

        .btn-register:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
        }

        /* 头部样式 */
        .main-header {
            background-color: rgba(26, 26, 26, 0.9);
            padding: 15px 0;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        }

        .main-header .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            font-size: 24px;
            font-weight: 700;
            color: var(--text-color);
        }

        .logo i {
            color: var(--primary-light);
            margin-right: 10px;
            font-size: 28px;
        }

        .main-nav ul {
            display: flex;
            list-style: none;
        }

        .main-nav ul li {
            margin: 0 15px;
        }

        .main-nav ul li a {
            font-weight: 500;
            position: relative;
            padding: 5px 0;
        }

        .main-nav ul li a.active {
            color: var(--primary-light);
        }

        .main-nav ul li a.active:after,
        .main-nav ul li a:hover:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--primary-light);
        }

        .user-actions {
            display: flex;
        }

        /* Hero 区域 */
        .hero {
            background: linear-gradient(135deg, var(--background-dark) 0%, var(--secondary-color) 100%);
            padding: 180px 0 100px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiPjxkZWZzPjxwYXR0ZXJuIGlkPSJwYXR0ZXJuIiB3aWR0aD0iNDAiIGhlaWdodD0iNDAiIHBhdHRlcm5Vbml0cz0idXNlclNwYWNlT25Vc2UiIHBhdHRlcm5UcmFuc2Zvcm09InJvdGF0ZSg0NSkiPjxyZWN0IHdpZHRoPSIyMCIgaGVpZ2h0PSIyMCIgZmlsbD0icmdiYSgxMDYsIDEzLCAxNzMsIDAuMDMpIi8+PC9wYXR0ZXJuPjwvZGVmcz48cmVjdCB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIiBmaWxsPSJ1cmwoI3BhdHRlcm4pIi8+PC9zdmc+') repeat;
            opacity: 0.6;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: 15px;
            position: relative;
            z-index: 1;
        }

        .hero p {
            font-size: 1.2rem;
            color: var(--text-light);
            margin-bottom: 30px;
            position: relative;
            z-index: 1;
        }

        .search-container {
            max-width: 700px;
            margin: 0 auto;
            position: relative;
            z-index: 1;
            display: flex;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }

        .search-container input {
            flex: 1;
            padding: 15px 25px;
            border: none;
            background: transparent;
            color: var(--text-color);
            font-size: 1rem;
            outline: none;
        }

        .search-container input::placeholder {
            color: rgba(255, 255, 255, 0.7);
        }

        .search-container button {
            padding: 15px 30px;
            border: none;
            background: var(--primary-color);
            color: white;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .search-container button:hover {
            background: var(--primary-dark);
        }

        /* 书籍网格 */
        .book-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 25px;
            margin: 40px 0;
        }

        .book-card {
            background: var(--background-light);
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            position: relative;
        }

        .book-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
        }

        .book-cover {
            height: 220px;
            background: #333;
            position: relative;
            overflow: hidden;
        }

        .book-cover img {
            
            width: 100%;
            height: 100%;
            object-fit: contain;
            transition: transform 0.5s ease;
            margin-top: 20px;

        }

        .book-card:hover .book-cover img {
            transform: scale(1.05);
        }

        .book-badge {
            position: absolute;
            top: 10px;
            right: 10px;
            background: var(--accent-color);
            color: white;
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 0.7rem;
            font-weight: bold;
        }

        .book-info {
            padding: 15px;
        }

        .book-title {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 5px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .book-author {
            font-size: 0.8rem;
            color: var(--text-light);
            margin-bottom: 10px;
        }

        .book-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.8rem;
        }

        .book-rating {
            color: #f1c40f;
        }

        .book-actions {
            display: flex;
            justify-content: space-between;
            margin-top: 15px;
        }

        .book-actions .btn {
            padding: 5px 10px;
            font-size: 0.8rem;
        }

        .btn-details {
            background: var(--primary-color);
            border: 1px solid var(--primary-color);
            flex: 1;
            margin-right: 5px;
            text-align: center;
        }

        .btn-details:hover {
            background: var(--primary-dark);
        }

        .btn-download {
            background: transparent;
            border: 1px solid var(--text-light);
            color: var(--text-light);
            flex: 1;
            text-align: center;
        }

        .btn-download:hover {
            border-color: var(--primary-light);
            color: var(--primary-light);
        }

        /* 分页 */
        .pagination {
            display: flex;
            justify-content: center;
            align-items: center;
            margin: 50px 0;
        }

        .pagination a, .pagination span {
            margin: 0 5px;
            padding: 8px 15px;
            border-radius: 4px;
            transition: all 0.3s ease;
        }

        .pagination a {
            background: var(--background-light);
        }

        .pagination a.active {
            background: var(--primary-color);
            color: white;
        }

        .pagination a:hover:not(.active) {
            background: rgba(255, 255, 255, 0.1);
        }

        .pagination .prev, .pagination .next {
            background: transparent;
            border: 1px solid var(--text-light);
        }

        .pagination .prev:hover, .pagination .next:hover {
            border-color: var(--primary-light);
            color: var(--primary-light);
        }

        /* 页脚 */
        .main-footer {
            background: var(--secondary-color);
            padding: 60px 0 0;
            color: var(--text-light);
        }

        .footer-content {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 30px;
        }

        .footer-column {
            margin-bottom: 30px;
        }

        .footer-column h3 {
            color: var(--text-color);
            margin-bottom: 20px;
            font-size: 1.2rem;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-column h3:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background: var(--primary-light);
        }

        .footer-column ul {
            list-style: none;
        }

        .footer-column ul li {
            margin-bottom: 10px;
        }

        .footer-column ul li a {
            color: var(--text-light);
        }

        .footer-column ul li a:hover {
            color: var(--primary-light);
            padding-left: 5px;
        }

        .social-icons {
            display: flex;
            margin-top: 20px;
        }

        .social-icons a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 35px;
            height: 35px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            margin-right: 10px;
            transition: all 0.3s ease;
        }

        .social-icons a:hover {
            background: var(--primary-light);
            transform: translateY(-3px);
        }

        .subscribe-form {
            display: flex;
            flex-direction: column;
            margin-top: 20px;
        }

        .subscribe-form input {
            padding: 12px;
            background: rgba(255, 255, 255, 0.1);
            border: none;
            color: var(--text-color);
            border-radius: 4px;
            margin-bottom: 10px;
        }

        .subscribe-form input:focus {
            outline: none;
            background: rgba(255, 255, 255, 0.2);
        }

        .subscribe-form button {
            padding: 12px;
            background: var(--primary-color);
            border: none;
            color: white;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
        }

        .subscribe-form button:hover {
            background: var(--primary-dark);
        }

        .footer-bottom {
            background: rgba(0, 0, 0, 0.2);
            padding: 20px 0;
            text-align: center;
            font-size: 0.9rem;
            margin-top: 30px;
        }

        /* 响应式设计 */
        @media (max-width: 1024px) {
            .book-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            
            .footer-content {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .main-header .container {
                flex-direction: column;
            }

            .logo {
                margin-bottom: 15px;
            }




            .main-nav ul {
                margin-bottom: 15px;
                flex-wrap: wrap;
                justify-content: center;
            }

            .main-nav ul li {
                margin: 5px 10px;
            }

            .user-actions {
                margin-top: 10px;
            }

            .hero h1 {
                font-size: 2.2rem;
            }

            .hero p {
                font-size: 1rem;
            }

            .search-container {
                flex-direction: column;
                background: transparent;
            }

            .search-container input {
                background: rgba(255, 255, 255, 0.1);
                border-radius: 4px;
                margin-bottom: 10px;
            }

            .search-container button {
                border-radius: 4px;
            }

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

        @media (max-width: 600px) {
            .footer-content {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {
            .book-grid {
                grid-template-columns: 1fr;
            }

            .pagination {
                flex-wrap: wrap;
            }

            .pagination a, .pagination span {
                margin: 5px;
            }
        }


/* Loading 动画样式 */
.loading-dots {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
}

.dots-loader {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 20px;
}

.dots-loader div {
    position: absolute;
    top: 50%;
    width: 10px;
    height: 10px;
    margin-top: -5px;
    border-radius: 50%;
    background: var(--primary-light);
    opacity: 0.4;
    animation: dotsFade 1.4s infinite ease-in-out both;
}

.dots-loader div:nth-child(1) {
    left: 0;
    animation-delay: -0.32s;
}

.dots-loader div:nth-child(2) {
    left: 15px;
    animation-delay: -0.16s;
}

.dots-loader div:nth-child(3) {
    left: 30px;
}

@keyframes dotsFade {
  0%, 80%, 100% { 
    transform: scale(0);
  } 40% { 
    transform: scale(1.0);
  }
}


.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-color);
    text-decoration: none; /* 去掉下划线 */
}