/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS 变量定义 - 全新配色方案 */
:root {
    /* 主色调 */
    --primary-color: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    
    /* 辅助色 */
    --secondary-color: #8b5cf6;
    --secondary-light: #a78bfa;
    --secondary-dark: #7c3aed;
    
    /* 功能色 */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #3b82f6;
    
    /* 中性色 */
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;
    
    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-accent: #eff6ff;
    --bg-overlay: rgba(0, 0, 0, 0.6);
    
    /* 文本色 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-light: #cbd5e1;
    
    /* 边框色 */
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    --border-focus: #3b82f6;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* 圆角 */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
    
    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* 基础样式 */
body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 背景装饰 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 头部样式 - 全新设计 */
header {
    background: var(--bg-primary);
    padding: 3rem 0;
    text-align: center;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
}

/* 头部装饰 */
header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--success-color));
    background-size: 200% 100%;
    animation: headerGradient 4s linear infinite;
}

@keyframes headerGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

header h1 {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.025em;
    position: relative;
    z-index: 1;
}

header h1 i {
    margin-right: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 2.5rem;
    vertical-align: middle;
}

header p {
    font-size: 1.375rem;
    color: var(--text-secondary);
    font-weight: 400;
    position: relative;
    z-index: 1;
}

/* 主内容区域 */
main {
    padding: 2.5rem 0;
    position: relative;
}

/* 筛选区域 - 全新设计 */
.filter-section {
    background: var(--bg-primary);
    padding: 1.75rem;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.filter-section:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    padding: 12px 28px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 1rem;
    font-family: var(--font-display);
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: left var(--transition-normal);
}

.filter-btn:hover::before {
    left: 100%;
}

.filter-btn:hover {
    border-color: var(--primary-light);
    color: var(--primary-color);
    background: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-lg);
}

.filter-btn.active:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.filter-btn i {
    font-size: 1.25rem;
    transition: transform var(--transition-normal);
}

.filter-btn:hover i {
    transform: scale(1.1);
}

/* 文档列表区域 - 全新设计 */
.documents-section {
    background: var(--bg-primary);
    padding: 2rem;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.documents-section:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.documents-section h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.75rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.documents-section h2 i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* 文档网格 - 全新布局 */
.documents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    position: relative;
}

/* 文档卡片 - 全新设计 */
.document-card {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
}

.document-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
    transform-origin: left;
}

.document-card:hover::before {
    transform: scaleX(1);
}

.document-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

/* 文档图标区域 */
.document-icon {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
}

.document-icon::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(255, 255, 255, 0.3), transparent 70%);
    pointer-events: none;
}

.document-icon i {
    font-size: 4.5rem;
    z-index: 1;
    transition: transform var(--transition-normal);
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
}

.document-card:hover .document-icon i {
    transform: scale(1.1) rotate(5deg);
}

/* 不同类型文档的图标颜色 */
.document-icon.ppt i {
    background: linear-gradient(135deg, #ff4d4f, #fa8c16);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.document-icon.word i {
    background: linear-gradient(135deg, #1890ff, #52c41a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.document-icon.excel i {
    background: linear-gradient(135deg, #52c41a, #faad14);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 文档信息区域 */
.document-info {
    padding: 1.75rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.document-info h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color var(--transition-normal);
}

.document-card:hover .document-info h3 {
    color: var(--primary-color);
}

.document-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    line-height: 1.5;
    flex-grow: 1;
}

.document-info .file-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* 文档操作按钮 */
.document-actions {
    display: flex;
    gap: 0.75rem;
    padding: 0 1.75rem 1.75rem;
}

.action-btn {
    flex: 1;
    padding: 10px 16px;
    border-radius: var(--radius-xl);
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    position: relative;
    overflow: hidden;
}

.action-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-normal);
}

.action-btn:hover::before {
    left: 100%;
}

.view-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-sm);
}

.view-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-btn {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.download-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-light);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* 加载状态 - 全新设计 */
.loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    font-size: 1.125rem;
    font-weight: 500;
    text-align: center;
}

.loading::after {
    content: '';
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-top: 1.5rem;
    display: block;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 空状态 - 全新设计 */
.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5rem 2rem;
    color: var(--text-tertiary);
    text-align: center;
}

.empty-state i {
    font-size: 5rem;
    margin-bottom: 1.5rem;
    color: var(--text-light);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

.empty-state h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 1.125rem;
    color: var(--text-tertiary);
    max-width: 500px;
    line-height: 1.6;
}

/* 模态框 - 全新设计 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-overlay);
    backdrop-filter: blur(8px);
    animation: modalFadeIn var(--transition-normal);
    overflow-y: auto;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--bg-primary);
    margin: 4% auto;
    padding: 0;
    border-radius: var(--radius-3xl);
    width: 94%;
    max-width: 1400px;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--border-color);
    animation: modalSlideIn var(--transition-normal);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 关闭按钮 - 全新设计 */
.close {
    position: absolute;
    right: 1.5rem;
    top: 1.5rem;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    z-index: 1001;
    box-shadow: var(--shadow-md);
}

.close:hover,
.close:focus {
    background: var(--error-color);
    color: white;
    transform: rotate(90deg) scale(1.1);
    box-shadow: var(--shadow-lg);
}

/* 查看器内容 */
#viewerContent {
    height: 85vh;
    overflow: auto;
    padding: 2rem;
    background: var(--bg-secondary);
}

.viewer-container {
    width: 100%;
    height: 500px; /* 缩小展示框高度 */
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    overflow: auto; /* 添加滚轮支持 */
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    margin: 0 auto;
    max-width: 100%;
    resize: vertical; /* 允许垂直调整大小 */
    padding: 0;
    min-height: 400px;
    transition: all var(--transition-normal);
    scroll-behavior: smooth; /* 添加平滑滚动 */
}

.viewer-container iframe {
    width: 100%;
    height: 500px; /* 缩小iframe高度，与容器匹配 */
    border: none;
    display: block;
    transition: all var(--transition-normal);
    transform-origin: center;
    image-rendering: auto;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
    zoom: 1;
}

/* 优化Office Online嵌入内容的显示 */
.viewer-container iframe[src*="officeapps.live.com"] {
    min-height: 500px;
    height: 100%;
    width: 100%;
    max-width: 100%;
    border: none;
    background: white;
}

/* 优化文档查看器区域 */
.document-viewer {
    margin: 1.5rem 0;
    position: relative;
    min-height: 500px;
    width: 100%;
}

/* 查看器控制按钮 */
.viewer-controls {
    margin-top: 1.5rem;
    text-align: center;
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.viewer-controls button {
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
    font-family: var(--font-display);
}

.viewer-controls button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.viewer-controls button:active {
    transform: translateY(0);
}

.viewer-controls i {
    font-size: 1.125rem;
}

/* 文档详情页面 */
.document-detail-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.document-detail-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-1px);
}

.document-header {
    display: flex;
    align-items: center;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
    gap: 2rem;
}

.document-header .document-icon {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-color);
}

.document-header .document-icon i {
    font-size: 5rem;
}

.document-header .document-info h2 {
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-display);
}

.document-header .document-info p {
    margin: 0.75rem 0;
    color: var(--text-secondary);
    font-size: 1.125rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.document-header .document-info i {
    color: var(--primary-color);
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

.document-viewer {
    margin-bottom: 2.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.document-actions.detail-actions {
    justify-content: center;
    padding: 0;
    margin-top: 2rem;
    gap: 1.25rem;
}

.document-actions .btn-primary {
    padding: 14px 36px;
    font-size: 1.125rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-md);
    font-family: var(--font-display);
}

.document-actions .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* 页脚 - 全新设计 */
footer {
    background: var(--bg-primary);
    color: var(--text-secondary);
    text-align: center;
    padding: 2.5rem 0;
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--success-color));
    background-size: 200% 100%;
    animation: headerGradient 4s linear infinite;
}

footer p {
    font-size: 1rem;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

footer p::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    margin: 1rem auto 0;
    border-radius: var(--radius-full);
}

/* 上传链接 - 全新设计 */
.upload-link {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
    z-index: 10;
    font-family: var(--font-display);
}

.upload-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-link i {
    font-size: 1.125rem;
}

/* 响应式设计 - 全新适配 */
@media (max-width: 1280px) {
    .container {
        max-width: 1024px;
    }
    
    .documents-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1.25rem;
    }
}

@media (max-width: 1024px) {
    .container {
        max-width: 768px;
    }
    
    header h1 {
        font-size: 2.75rem;
    }
    
    header p {
        font-size: 1.125rem;
    }
    
    .documents-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
        gap: 1.125rem;
    }
    
    .filter-buttons {
        gap: 0.75rem;
    }
    
    .filter-btn {
        padding: 10px 24px;
        font-size: 0.95rem;
    }
}

@media (max-width: 768px) {
    .container {
        max-width: 100%;
        padding: 0 1.25rem;
    }
    
    header {
        padding: 2.5rem 0;
    }
    
    header h1 {
        font-size: 2.25rem;
    }
    
    header h1 i {
        font-size: 2rem;
        margin-right: 0.75rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    .upload-link {
        position: static;
        display: inline-block;
        margin-top: 1.5rem;
    }
    
    main {
        padding: 1.5rem 0;
    }
    
    .filter-section {
        padding: 1.25rem;
        margin-bottom: 1.5rem;
    }
    
    .filter-buttons {
        gap: 0.5rem;
    }
    
    .filter-btn {
        padding: 8px 20px;
        font-size: 0.9rem;
    }
    
    .filter-btn i {
        display: none;
    }
    
    .documents-section {
        padding: 1.5rem;
    }
    
    .documents-section h2 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    .documents-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 1rem;
    }
    
    .document-info {
        padding: 1.5rem;
    }
    
    .document-actions {
        padding: 0 1.5rem 1.5rem;
    }
    
    .modal-content {
        width: 96%;
        margin: 5% auto;
    }
    
    #viewerContent {
        padding: 1.5rem;
    }
    
    .document-detail-card {
        padding: 2rem;
    }
    
    .document-header {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .document-header .document-info h2 {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.875rem;
    }
    
    header h1 i {
        font-size: 1.75rem;
        margin-right: 0.5rem;
    }
    
    .filter-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    
    .documents-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .documents-section {
        padding: 1.25rem;
    }
    
    .document-icon {
        height: 140px;
    }
    
    .document-icon i {
        font-size: 4rem;
    }
    
    .document-info h3 {
        font-size: 1.125rem;
    }
    
    .modal-content {
        width: 98%;
        margin: 8% auto;
        max-height: 92vh;
    }
    
    #viewerContent {
        padding: 1.25rem;
        height: 75vh;
    }
    
    .close {
        right: 1rem;
        top: 1rem;
        width: 36px;
        height: 36px;
        font-size: 1.25rem;
    }
    
    .viewer-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .viewer-controls button {
        justify-content: center;
    }
    
    .document-detail-card {
        padding: 1.5rem;
    }
    
    .document-header .document-icon {
        width: 100px;
        height: 100px;
    }
    
    .document-header .document-icon i {
        font-size: 4rem;
    }
    
    .document-header .document-info h2 {
        font-size: 1.5rem;
    }
}

/* 滚动条样式 - 全新设计 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-secondary);
    transition: all var(--transition-normal);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* 选择文本样式 */
::selection {
    background: rgba(59, 130, 246, 0.2);
    color: var(--primary-color);
}

::-moz-selection {
    background: rgba(59, 130, 246, 0.2);
    color: var(--primary-color);
}

/* 焦点样式 */
*:focus {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

button:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* 禁用状态 */
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* 动画效果 */
.fade-in {
    animation: fadeIn var(--transition-normal);
}

.slide-up {
    animation: slideUp var(--transition-normal);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

/* 增强可访问性 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 打印样式 */
@media print {
    body {
        background: white;
    }
    
    header, .filter-section, .document-actions, footer, .close {
        display: none;
    }
    
    .modal-content {
        box-shadow: none;
        border: none;
        width: 100%;
        height: 100%;
        margin: 0;
        max-height: 100%;
    }
    
    #viewerContent {
        padding: 0;
        height: 100%;
    }
}