/* 全局样式 */
:root {
    /* 主色调 */
    --primary-color: #8A2BE2; /* 紫罗兰色 */
    --primary-light: #9D50BB; /* 浅紫色 */
    --primary-dark: #6A0DAD; /* 深紫色 */
    
    /* 辅助色 */
    --secondary-color: #6C63FF; /* 蓝紫色 */
    --accent-color: #DD2A7B; /* 粉红色 */
    
    /* 中性色 */
    --text-color: #333333;
    --text-light: #666666;
    --text-muted: #999999;
    --background-color: #F5F7FA;
    --card-background: #FFFFFF;
    
    /* 特殊效果色 */
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    
    /* 阴影相关 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    
    /* 圆角 */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --border-radius-full: 9999px;
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* 字体 */
    --font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    
    /* 动画时间 */
    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    color: var(--text-color);
    background-color: var(--background-color);
    line-height: 1.5;
}

ul, ol {
    list-style: none;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color var(--transition-fast) ease;
}

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

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

input, button, textarea, select {
    font: inherit;
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
}

/* 页面布局 */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
    background-image: linear-gradient(135deg, #6A11CB 0%, #2575FC 100%);
}

.app-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    z-index: 0;
}

.app-header, .app-footer, .main-content {
    position: relative;
    z-index: 1;
}

.main-content {
    display: flex;
    flex: 1;
    position: relative;
}

.content-container {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

/* 页头样式 */
.app-header {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1440px;
    margin: 0 auto;
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    font-size: var(--font-size-xl);
    font-weight: bold;
    color: white;
}

.logo-text {
    margin-left: var(--spacing-sm);
    background: linear-gradient(45deg, #FF3CAC, #784BA0, #2B86C5);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.nav-container {
    flex: 1;
    margin: 0 var(--spacing-xl);
}

.nav-list {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.nav-link {
    color: white;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-full);
    transition: all var(--transition-fast) ease;
    position: relative;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: -2px;
    width: 20px;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: var(--border-radius-full);
}

.search-container {
    position: relative;
}

.search-form {
    display: flex;
    align-items: center;
}

.search-input {
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-full);
    padding: var(--spacing-sm) var(--spacing-md);
    padding-right: 40px;
    color: white;
    width: 200px;
    transition: all var(--transition-normal) ease;
}

.search-input:focus {
    outline: none;
    width: 250px;
    background-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

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

.search-button {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background-color: transparent;
    border: none;
    color: white;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-full);
}

.search-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 页脚样式 */
.app-footer {
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(10px);
    color: white;
    padding: var(--spacing-lg) 0;
    margin-top: auto;
    position: relative;
    z-index: 10;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.footer-section {
    flex: 1;
    margin-right: var(--spacing-xl);
}

.footer-section:last-child {
    margin-right: 0;
}

.footer-section h3 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.9);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast) ease;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

/* 侧边栏样式 */
.app-sidebar {
    width: 250px;
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-lg) 0;
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-container {
    padding: 0 var(--spacing-md);
}

.sidebar-section {
    margin-bottom: var(--spacing-xl);
}

.sidebar-section h3 {
    color: white;
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-md);
    font-size: var(--font-size-md);
    font-weight: 600;
}

.sidebar-item {
    margin-bottom: var(--spacing-xs);
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    color: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-fast) ease;
}

.sidebar-link:hover, .sidebar-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
}

.sidebar-link .icon {
    margin-right: var(--spacing-sm);
}

/* 卡片和内容区域通用样式 */
.section-title {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.neu-card {
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 
        8px 8px 16px rgba(0, 0, 0, 0.1),
        -8px -8px 16px rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform var(--transition-normal) ease, box-shadow var(--transition-normal) ease;
}

.neu-card:hover {
    transform: translateY(-2px);
    box-shadow: 
        10px 10px 20px rgba(0, 0, 0, 0.12),
        -10px -10px 20px rgba(255, 255, 255, 0.07);
}

.hero-section {
    text-align: center;
    padding: var(--spacing-xxl) 0;
    margin-bottom: var(--spacing-xl);
}

.hero-section h1 {
    font-size: var(--font-size-xxl);
    color: white;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-section p {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-lg);
}

.search-bar {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
}

.search-bar input {
    flex: 1;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md) 0 0 var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
}

.search-bar input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

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

.search-bar button {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--accent-color);
    color: white;
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
    font-weight: 600;
    transition: background-color var(--transition-fast) ease;
}

.search-bar button:hover {
    background-color: #c9256e;
}

.search-bar.large {
    max-width: 800px;
}

.search-filters {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-full);
    background-color: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    transition: all var(--transition-fast) ease;
}

.filter-btn:hover, .filter-btn.active {
    background-color: rgba(255, 255, 255, 0.3);
    color: white;
}

/* 内容组件样式 */
.playlist-container, .music-container, .charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.playlist-item, .music-item, .chart-item {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: transform var(--transition-normal) ease, box-shadow var(--transition-normal) ease;
}

.playlist-item:hover, .music-item:hover, .chart-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.playlist-cover, .music-cover, .chart-cover {
    position: relative;
    padding-top: 100%; /* 1:1 宽高比 */
    overflow: hidden;
}

.playlist-cover img, .music-cover img, .chart-cover img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow) ease;
}

.playlist-item:hover img, .music-item:hover img, .chart-item:hover img {
    transform: scale(1.05);
}

.playlist-info, .music-info, .chart-info {
    padding: var(--spacing-md);
    background-color: rgba(0, 0, 0, 0.2);
}

.playlist-title, .music-title, .chart-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.playlist-creator, .music-artist, .chart-update {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 加载指示器 */
.loading-indicator {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
    color: rgba(255, 255, 255, 0.7);
    font-weight: 500;
}

.loading-indicator::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    margin-left: var(--spacing-md);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
}

.empty-state p {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-lg);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .footer-container {
        flex-wrap: wrap;
    }

    .footer-section {
        flex: 1 1 calc(50% - var(--spacing-lg));
        margin-bottom: var(--spacing-lg);
    }
}

@media (max-width: 992px) {
    .playlist-container, .music-container, .charts-container {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
}

@media (max-width: 768px) {
    .app-sidebar {
        position: fixed;
        left: -250px;
        top: 0;
        bottom: 0;
        z-index: 200;
        transition: left var(--transition-normal) ease;
    }

    .app-sidebar.active {
        left: 0;
    }

    .nav-list {
        gap: var(--spacing-md);
    }

    .search-input {
        width: 150px;
    }

    .search-input:focus {
        width: 200px;
    }

    .footer-section {
        flex: 1 1 100%;
    }
}

@media (max-width: 576px) {
    .header-container {
        flex-wrap: wrap;
    }

    .nav-container {
        order: 3;
        width: 100%;
        margin: var(--spacing-md) 0 0;
    }

    .search-container {
        flex: 1;
        margin-left: var(--spacing-md);
    }

    .playlist-container, .music-container, .charts-container {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }

    .section-title {
        font-size: var(--font-size-lg);
    }

    .hero-section h1 {
        font-size: var(--font-size-xl);
    }

    .hero-section p {
        font-size: var(--font-size-md);
    }
}

/* 工具类 */
.text-center {
    text-align: center;
}

.d-flex {
    display: flex;
}

.align-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.flex-column {
    flex-direction: column;
}

.flex-grow {
    flex-grow: 1;
}

.w-100 {
    width: 100%;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}