* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        a{text-decoration:none}
        :root {
            --primary: #4a9df0; /* 柔和的蓝色 */
            --primary-light: #6db3f2;
            --secondary: #7e6bdb; /* 柔和的紫色 */
            --accent: #ff8c8c; /* 柔和的珊瑚色 */
            --light: #ffffff;
            --light-bg: #f8fbff;
            --light-border: #e1e8f0;
            --text: #2d3748;
            --text-light: #718096;
            --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
            --shadow: 0 8px 25px rgba(106, 101, 255, 0.1);
            --transition: all 0.3s ease;
            --card-bg: rgba(255, 255, 255, 0.9);
        }
        
        body {
            font-family: 'Poppins', sans-serif;
            background-color: var(--light-bg);
            color: var(--text);
            line-height: 1.6;
            overflow-x: hidden;
        }
        
        /* 头部样式 */
        header {
            background: var(--light);
            color: var(--text);
            padding: 1rem 5%;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            color: var(--primary);
        }
        
        .logo i {
            margin-right: 10px;
            font-size: 2rem;
            color: var(--primary);
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 2rem;
        }
        
        .nav-links a {
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            padding: 8px 15px;
            border-radius: 30px;
            transition: var(--transition);
            font-size: 1.1rem;
        }
        
        .nav-links a:hover, 
        .nav-links a.active {
            color: var(--primary);
            background: rgba(74, 157, 240, 0.1);
        }
        
        .auth-buttons {
            display: flex;
            gap: 15px;
        }
        
        .auth-btn {
            padding: 10px 25px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
            font-size: 1rem;
        }
        
        .login {
            background: transparent;
            color: var(--text);
            border: 2px solid var(--primary);
        }
        
        .signup {
            background: var(--gradient);
            color: white;
            box-shadow: var(--shadow);
        }
        
        .auth-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 20px rgba(106, 101, 255, 0.15);
        }
        
        /* Banner样式 */
        .banner {
            height: 90vh;
            background: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.7)), url('https://img.sleepingharmony.com/images/banner.png') center/cover no-repeat;
            display: flex;
            align-items: center;
            text-align: center;
            padding: 0 10%;
            color: var(--text);
            position: relative;
            margin-top: 80px;
        }
        
        .banner-content {
            max-width: 900px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }
        
        .banner h1 {
            font-size: 3.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            color: var(--text);
            text-shadow: 0 2px 10px rgba(255, 255, 255, 0.8);
        }
        
        .banner p {
            font-size: 1.5rem;
            margin-bottom: 2.5rem;
            color: var(--text-light);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .btn {
            display: inline-block;
            background: var(--primary);
            color: white;
            padding: 18px 50px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 1.2rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            box-shadow: 0 5px 20px  rgba(106, 101, 255, 0.15);
            position: relative;
            overflow: hidden;
            z-index: 1;
        }
        
        .btn:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 0;
            height: 100%;
            background: var(--accent);
            transition: var(--transition);
            z-index: -1;
        }
        
        .btn:hover:before {
            width: 100%;
        }
        
        .btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px var(--accent);
        }
        
        /* 分类区域 */
        .categories {
            padding: 6rem 5%;
            background-color: var(--light-bg);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 4rem;
        }
        
        .section-title h2 {
            font-size: 2.8rem;
            color: var(--text);
            margin-bottom: 1.5rem;
            position: relative;
            display: inline-block;
            font-weight: 700;
        }
        
        .section-title h2:after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 5px;
            background: var(--primary);
            border-radius: 3px;
        }
        
        .section-title p {
            color: var(--text-light);
            max-width: 800px;
            margin: 2rem auto 0;
            font-size: 1.2rem;
            line-height: 1.8;
        }
        
        /* 垂直排列分类 */
        .category-vertical {
            display: flex;
            flex-direction: column;
            gap: 5rem;
            margin-top: 3rem;
        }
        
        .category-section {
            background: var(--card-bg);
            border-radius: 20px;
            padding: 40px;
            box-shadow: var(--shadow);
            border: 1px solid var(--light-border);
        }
        
        .category-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--light-border);
        }
        
        .category-header h3 {
            font-size: 2.2rem;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 15px;
            font-weight: 600;
        }
        
        .category-header h3 i {
            color: var(--secondary);
            font-size: 1.8rem;
        }
        
        .view-more {
            color: var(--primary);
            text-decoration: none;
            font-weight: 700;
            font-size: 1.1rem;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .view-more:hover {
            color: var(--accent);
            transform: translateX(5px);
        }
        
        .music-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
        }
        
        /* 大封面音乐项目 */
        .music-item {
            position: relative;
            border-radius: 15px;
            overflow: hidden;
            height: 300px;
            transition: var(--transition);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
        }
        
        .music-item:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(106, 101, 255, 0.15);
        }
        
        .cover {
            width: 100%;
            height: 100%;
            background-size: cover;
            background-position: center;
            position: relative;
            transition: var(--transition);
        }
        
        .cover img {
            width: 100%;
            height: 100%;
            display: block;
            transition: var(--transition);
        }
        
        .music-item:hover .cover {
            transform: scale(1.03);
        }
        
        .title-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 25px 20px;
            background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
            transition: var(--transition);
        }
        
        .music-info h4 {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: white;
        }
        
        .music-info p {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.85);
        }
        
        /* 睡眠知识板块 */
        .knowledge {
            padding: 6rem 5%;
            background-color: #fff;
            position: relative;
        }
        
        .knowledge-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 3rem;
            padding: 0 5%;
        }
        
        .knowledge-header h2 {
            font-size: 2.5rem;
            color: var(--text);
            position: relative;
            padding-bottom: 15px;
            font-weight: 700;
        }
        
        .knowledge-header h2:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 5px;
            background: var(--primary);
            border-radius: 3px;
        }
        
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 30px;
            padding: 0 5%;
        }
        
        .article-card {
            background: var(--light);
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        
        .article-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(106, 101, 255, 0.15);
        }
        
        .article-cover {
            height: 200px;
            background-size: cover;
            background-position: center;
            position: relative;
            transition: var(--transition);
        }
        
        .article-card:hover .article-cover {
            transform: scale(1.03);
        }
        
        .article-info {
            padding: 25px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        
        .article-info h3 {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: var(--text);
            flex-grow: 1;
        }
        
        .publish-date {
            color: var(--text-light);
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: auto;
        }
        
        .publish-date i {
            color: var(--primary);
        }
        
        /* 特色区域 */
        .features {
            padding: 6rem 5%;
            background: linear-gradient(to bottom, var(--light-bg), #ffffff);
            text-align: center;
        }
        
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 40px;
            margin-top: 50px;
        }
        
        .feature-card {
            background: var(--light);
            border-radius: 20px;
            padding: 40px 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(106, 101, 255, 0.15);
        }
        
        .feature-icon {
            width: 100px;
            height: 100px;
            background: linear-gradient(135deg, var(--primary-light), var(--primary));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 25px;
            color: white;
            font-size: 2.5rem;
        }
        
        .feature-card h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: var(--text);
        }
        
        .feature-card p {
            color: var(--text-light);
            line-height: 1.8;
        }
        
        /* 页脚 */
        footer {
            background: linear-gradient(to right, #4a9df0, #7e6bdb);
            color: white;
            padding: 5rem 5% 2rem;
            position: relative;
            overflow: hidden;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 3rem;
            position: relative;
            z-index: 2;
        }
        
        .footer-column h3 {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 10px;
            font-weight: 600;
        }
        
        .footer-column h3:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: white;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 15px;
        }
        
        .footer-links a {
            color: rgba(255, 255, 255, 0.9);
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .footer-links a:hover {
            color: white;
            transform: translateX(5px);
        }
        
        .social-icons {
            display: flex;
            margin-top: 25px;
            gap: 15px;
        }
        
        .social-icons a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.2);
            color: white;
            transition: var(--transition);
        }
        
        .social-icons a:hover {
            background: white;
            color: var(--primary);
            transform: translateY(-5px);
        }
        
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.2);
            color: rgba(255, 255, 255, 0.9);
            font-size: 1rem;
            position: relative;
            z-index: 2;
        }
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            .music-grid, .articles-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            
            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 992px) {
            .banner h1 {
                font-size: 3.2rem;
            }
            
            .banner p {
                font-size: 1.3rem;
            }
            
            .section-title h2 {
                font-size: 2.4rem;
            }
            
            .category-header h3 {
                font-size: 1.9rem;
            }
            
            .knowledge-header h2 {
                font-size: 2.2rem;
            }
        }
        
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            
            .banner {
                height: 80vh;
                padding: 0 5%;
            }
            
            .banner h1 {
                font-size: 2.5rem;
            }
            
            .music-grid, .articles-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .category-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 15px;
            }
            
            .footer-content {
                grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            }
            
            .feature-grid {
                grid-template-columns: 1fr;
            }
            
            .knowledge-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 20px;
                margin-bottom: 2rem;
            }
        }
        
        @media (max-width: 576px) {
            .banner {
                height: 85vh;
            }
            
            .banner h1 {
                font-size: 2rem;
            }
            
            .banner p {
                font-size: 1.1rem;
            }
            
            .btn {
                padding: 15px 35px;
                font-size: 1.1rem;
            }
            
            .section-title h2 {
                font-size: 1.8rem;
            }
            
            .music-grid, .articles-grid {
                grid-template-columns: 1fr;
            }
            
            .auth-buttons {
                flex-direction: column;
                gap: 10px;
            }
        }