/* 基础重置与变量定义 */
:root {
    /* 禅意色彩体系 */
    --color-primary: #8B4513;
    --color-primary-light: #A0522D;
    --color-secondary: #2C3E50;
    --color-accent: #16A085;
    --color-bg-dark: #0F1A20;
    --color-bg-medium: #1A2B3A;
    --color-bg-light: #243B47;
    --color-text: #E8F1F2;
    --color-text-light: #B8D4D9;
    --color-border: #34495E;
    --color-success: #27AE60;
    --color-warning: #F39C12;
    --color-error: #E74C3C;
    
    /* 阴影层次 */
    --shadow-level-1: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-level-2: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-level-3: 0 8px 32px rgba(0, 0, 0, 0.4);
    
    /* 动画过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-round: 50%;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--color-bg-dark);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 莲花背景 */
.lotus-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.1;
    pointer-events: none;
}

.lotus {
    position: absolute;
    background: radial-gradient(circle, var(--color-primary) 0%, transparent 70%);
    border-radius: var(--radius-round);
    animation: float 20s infinite ease-in-out;
}

.lotus-1 {
    width: 300px;
    height: 300px;
    top: 10%;
    left: 5%;
    animation-delay: 0s;
}

.lotus-2 {
    width: 200px;
    height: 200px;
    bottom: 15%;
    right: 10%;
    animation-delay: -5s;
}

.lotus-3 {
    width: 150px;
    height: 150px;
    top: 50%;
    left: 80%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* 主容器 */
.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, 
        rgba(139, 69, 19, 0.1) 0%, 
        rgba(26, 43, 58, 0.3) 100%);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-level-2);
    animation: slideDown var(--transition-normal);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.logo i {
    font-size: 2.5rem;
    color: var(--color-primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.logo h1 {
    font-size: 2.2rem;
    font-weight: 300;
    background: linear-gradient(45deg, var(--color-text), var(--color-text-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--color-text-light);
    font-weight: 300;
    letter-spacing: 1px;
}

/* 快速访问按钮样式 */
.quick-access {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.btn-quick-access {
    padding: 8px 20px;
    background: rgba(139, 69, 19, 0.2);
    border: 1px solid var(--color-primary);
    color: var(--color-text);
    border-radius: var(--radius-md);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.btn-quick-access:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.btn-quick-access.secondary {
    background: rgba(36, 59, 71, 0.5);
    border-color: var(--color-border);
}

.btn-quick-access.secondary:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

/* 主内容区 */
.main-content {
    display: flex;
    gap: var(--spacing-lg);
    flex: 1;
    margin-bottom: var(--spacing-lg);
}

@media (max-width: 1024px) {
    .main-content {
        flex-direction: column;
    }
}

/* 侧边栏 */
.sidebar {
    width: 280px;
    background: rgba(26, 43, 58, 0.7);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-level-2);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
}

@media (max-width: 1024px) {
    .sidebar {
        width: 100%;
    }
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 500;
    font-size: 1.2rem;
}

/* 统计和刷新区域 */
.sidebar-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    background: rgba(36, 59, 71, 0.3);
}

.stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.btn-refresh {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast);
    font-size: 0.85rem;
}

.btn-refresh:hover {
    background: var(--color-primary-light);
    transform: scale(1.05);
}

.btn-refresh:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* 分类列表 */
.category-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

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

.category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: rgba(36, 59, 71, 0.5);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.category-header:hover {
    background: rgba(36, 59, 71, 0.8);
    border-color: var(--color-primary);
}

.category-header.active {
    background: rgba(139, 69, 19, 0.2);
    border-color: var(--color-primary);
}

.category-name {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex: 1;
    font-weight: 500;
}

.category-count {
    background: var(--color-primary);
    color: white;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.8rem;
    min-width: 24px;
    text-align: center;
}

/* 内容区域 */
.content-area {
    flex: 1;
    background: rgba(26, 43, 58, 0.7);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-level-2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 文件头部 */
.files-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    background: rgba(36, 59, 71, 0.5);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.current-category {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.current-category h2 {
    font-size: 1.5rem;
    font-weight: 500;
}

.category-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

/* 文件操作区域 */
.file-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.selection-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 0.95rem;
}

.total-size {
    color: var(--color-accent);
    font-weight: 500;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    align-items: center;
}

/* 分页控件样式 */
.pagination-controls {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-right: 15px;
    flex-wrap: wrap;
}

.page-size-select {
    padding: 8px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-bg-medium);
    color: var(--color-text);
    font-size: 0.9rem;
    cursor: pointer;
    min-width: 100px;
}

.page-size-select:hover {
    border-color: var(--color-primary);
}

.pagination-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-page-nav {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-bg-medium);
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-page-nav:hover:not(:disabled) {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.btn-page-nav:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#pageInfo {
    font-size: 0.9rem;
    color: var(--color-text-light);
    min-width: 80px;
    text-align: center;
}

.page-input {
    width: 60px;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: var(--color-bg-medium);
    color: var(--color-text);
    text-align: center;
    font-size: 0.9rem;
}

.page-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

@media (max-width: 768px) {
    .pagination-controls {
        order: -1;
        width: 100%;
        margin-bottom: 15px;
        justify-content: center;
    }
}

.btn-action {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: rgba(36, 59, 71, 0.5);
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.btn-action:hover {
    background: rgba(36, 59, 71, 0.8);
    transform: translateY(-2px);
}

.btn-action:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.btn-primary:hover {
    background: #138A72;
}

/* 文件容器 */
.files-container {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
    position: relative;
}

.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-light);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 300;
}

.empty-state p {
    font-size: 1rem;
    max-width: 400px;
    margin: 0 auto;
}

.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-md);
    opacity: 0;
    animation: fadeIn var(--transition-normal) forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* 文件卡片 */
.file-card {
    background: rgba(36, 59, 71, 0.5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.file-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-level-3);
    border-color: var(--color-primary);
}

.file-card.selected {
    background: rgba(22, 160, 133, 0.1);
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px rgba(22, 160, 133, 0.3);
}

.file-card-body {
    flex: 1;
}

.file-name {
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    font-size: 1.1rem;
    line-height: 1.4;
    word-break: break-word;
}

.file-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--color-text-light);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.file-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.file-select {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-select.selected {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.file-select.selected::after {
    content: '✓';
    color: white;
    font-size: 12px;
}

.file-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-preview {
    padding: 6px 12px;
    background: rgba(36, 59, 71, 0.5);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.btn-preview:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.btn-download-single {
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    transition: all var(--transition-fast);
}

.btn-download-single:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

/* 加载状态 */
.loading-categories,
.loading-files {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--color-text-light);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(139, 69, 19, 0.3);
    border-top-color: var(--color-primary);
    border-radius: var(--radius-round);
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* 底部栏 */
.footer {
    background: rgba(26, 43, 58, 0.7);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-level-1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.footer-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.btn-manager {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-round);
    background: rgba(139, 69, 19, 0.2);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-manager:hover {
    background: var(--color-primary);
    transform: rotate(90deg);
}

/* 模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 26, 32, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
    animation: fadeIn var(--transition-normal);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--color-bg-medium);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-level-3);
    border: 1px solid var(--color-border);
    width: 90%;
    max-width: 800px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    animation: scaleIn var(--transition-normal);
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-sm {
    max-width: 500px;
}

.modal-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-close {
    background: transparent;
    border: none;
    color: var(--color-text);
    font-size: 1.5rem;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-round);
    transition: all var(--transition-fast);
}

.btn-close:hover {
    background: rgba(231, 76, 60, 0.2);
    color: var(--color-error);
}

.modal-body {
    padding: var(--spacing-md);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: rgba(36, 59, 71, 0.5);
}

/* 下载确认 */
.download-info {
    text-align: center;
    padding: var(--spacing-md);
}

.download-info p {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.download-options {
    margin-top: var(--spacing-md);
    text-align: left;
}

.download-options label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.download-options label:hover {
    background: rgba(36, 59, 71, 0.3);
}

/* 快速链接样式 */
.quick-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.quick-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(36, 59, 71, 0.3);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.quick-link:hover {
    background: rgba(139, 69, 19, 0.1);
    border-color: var(--color-primary);
    transform: translateX(5px);
    text-decoration: none;
    color: var(--color-text);
}

.quick-link i {
    font-size: 1.5rem;
    color: var(--color-primary);
    width: 40px;
}

.link-info {
    flex: 1;
}

.link-title {
    font-weight: 500;
    margin-bottom: 5px;
}

.link-url {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-family: monospace;
}

/* 预览模态框 */
.modal-lg {
    max-width: 900px;
}

.preview-content {
    min-height: 300px;
}

/* 下载进度样式 */
.progress-info {
    padding: var(--spacing-md) 0;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

#progressStatus {
    color: var(--color-text);
}

#progressPercent {
    color: var(--color-accent);
    font-weight: bold;
}

.progress-bar {
    height: 12px;
    background: rgba(36, 59, 71, 0.5);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, 
        var(--color-primary), 
        var(--color-accent));
    border-radius: 6px;
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.1) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.1) 50%,
        rgba(255, 255, 255, 0.1) 75%,
        transparent 75%,
        transparent
    );
    background-size: 30px 12px;
    animation: progressStripe 1s linear infinite;
}

@keyframes progressStripe {
    0% { background-position: 0 0; }
    100% { background-position: 30px 0; }
}

.progress-details {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.progress-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.progress-item:last-child {
    margin-bottom: 0;
}

.progress-tips {
    background: rgba(247, 220, 111, 0.1);
    border: 1px solid rgba(247, 220, 111, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-size: 0.9rem;
}

.progress-tips h4 {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    color: var(--color-warning);
}

.progress-tips ul {
    margin: 0;
    padding-left: var(--spacing-md);
}

.progress-tips li {
    margin-bottom: 4px;
    line-height: 1.4;
}

.progress-tips li:last-child {
    margin-bottom: 0;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .header {
        padding: var(--spacing-md);
    }
    
    .logo h1 {
        font-size: 1.8rem;
    }
    
    .files-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .btn-action {
        flex: 1;
        justify-content: center;
    }
    
    .file-meta {
        flex-direction: column;
        gap: 2px;
    }
    
    .sidebar-stats {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(36, 59, 71, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-light);
}

/* 工具提示 */
[title] {
    position: relative;
}

[title]:hover::after {
    content: attr(title);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-bg-dark);
    color: var(--color-text);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    white-space: nowrap;
    z-index: 1000;
    border: 1px solid var(--color-border);
    margin-bottom: 5px;
}

/* 修复加载状态 */
.loading-categories,
.loading-files {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--color-text-light);
}

/* 错误状态 */
.error-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-error);
}

.error-state i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

/* 空分类状态 */
.empty-categories {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.empty-categories i {
    font-size: 3rem;
    opacity: 0.5;
}

.btn-retry {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-retry:hover {
    background: var(--color-primary-light);
}

/* 通知样式 */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--color-bg-medium);
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-level-3);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: 3000;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    max-width: 400px;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    border-left-color: var(--color-success);
}

.notification.warning {
    border-left-color: var(--color-warning);
}

.notification.error {
    border-left-color: var(--color-error);
}

.notification i {
    font-size: 1.2rem;
}

.notification.success i {
    color: var(--color-success);
}

.notification.warning i {
    color: var(--color-warning);
}

.notification.error i {
    color: var(--color-error);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-round);
    background: var(--color-primary);
    color: white;
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    box-shadow: var(--shadow-level-3);
    transition: all var(--transition-fast);
}

.back-to-top:hover {
    background: var(--color-primary-light);
    transform: translateY(-5px);
}

.back-to-top i {
    font-size: 1.2rem;
}

/* 大文件警告样式 */
.large-file-warning {
    text-align: center;
}

.large-file-warning p {
    margin-bottom: var(--spacing-md);
}

.warning-tips {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    background: rgba(243, 156, 18, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    text-align: left;
}

.warning-tips i {
    color: var(--color-warning);
    font-size: 1.2rem;
    margin-top: 2px;
}

.warning-tips ul {
    margin: 5px 0 0 0;
    padding-left: var(--spacing-md);
}

.warning-tips li {
    font-size: 0.9rem;
    margin-bottom: 3px;
}

/* 下载警告提示 */
.download-warning {
    margin-top: 10px;
    padding: 8px 12px;
    background: rgba(243, 156, 18, 0.1);
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--color-warning);
    border: 1px solid rgba(243, 156, 18, 0.2);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 空状态提示 */
.empty-hint {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 5px;
}