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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

/* 容器样式 */
.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-bottom: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.15);
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98) 0%, rgba(255, 255, 255, 0.95) 100%);
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1), 0 1px 0 rgba(255, 255, 255, 0.8) inset;
    padding: 12px 0;
    margin-bottom: 30px;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
}

.navbar-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 26px;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 20px rgba(102, 126, 234, 0.2);
}

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

.navbar-nav a {
    color: #4a5568;
    text-decoration: none;
    padding: 10px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.navbar-nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
    border-radius: 12px;
}

.navbar-nav a:hover {
    color: white;
    transform: translateY(-2px);
}

.navbar-nav a:hover::before {
    opacity: 1;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(56, 239, 125, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
    color: white;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(235, 51, 73, 0.4);
}

.btn-warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.btn-warning:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(245, 87, 108, 0.4);
}

.btn-info {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
}

.btn-info:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(79, 172, 254, 0.4);
}

.btn-small {
    padding: 6px 14px;
    font-size: 14px;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* 标题样式 */
.page-title {
    font-size: 32px;
    font-weight: bold;
    margin-bottom: 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #333;
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.table thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.table th {
    padding: 16px;
    text-align: left;
    font-weight: 600;
}

.table td {
    padding: 16px;
    border-bottom: 1px solid #f0f0f0;
}

.table tbody tr {
    background: white;
    transition: background-color 0.3s ease;
}

.table tbody tr:hover {
    background-color: #f8f9ff;
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* 标签页样式 */
.tabs {
    display: flex;
    border-bottom: 2px solid #f0f0f0;
    margin-bottom: 30px;
}

.tab {
    padding: 15px 30px;
    cursor: pointer;
    font-weight: 600;
    color: #888;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

.tab:hover {
    color: #667eea;
}

.tab.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* 提示消息样式 */
.alert {
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-weight: 500;
}

.alert-success {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    color: #856404;
    border: 1px solid #ffeaa7;
}

/* 进度条样式 */
.progress-container {
    margin: 20px 0;
}

.progress-label {
    font-size: 14px;
    margin-bottom: 8px;
    color: #666;
    font-weight: 500;
}

.progress-bar-container {
    width: 100%;
    height: 24px;
    background: #f0f0f0;
    border-radius: 12px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    transition: width 0.3s ease;
}

/* 搜索框样式 */
.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    max-width: 600px;
}

.search-box .form-control {
    flex: 1;
}

/* 文件卡片网格 */
.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.file-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.file-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.file-icon {
    font-size: 48px;
    margin-bottom: 15px;
    text-align: center;
}

.file-name {
    font-weight: 600;
    margin-bottom: 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-meta {
    font-size: 14px;
    color: #888;
    margin-bottom: 15px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .navbar-nav {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    .navbar-nav a {
        margin: 0;
    }
    
    .container {
        padding: 10px;
    }
    
    .card {
        padding: 20px;
    }
    
    .page-title {
        font-size: 24px;
    }
    
    .tabs {
        flex-wrap: wrap;
    }
    
    .tab {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .search-box {
        flex-direction: column;
    }
    
    .file-grid {
        grid-template-columns: 1fr;
    }
}

/* 特色区块 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.feature {
    text-align: center;
    padding: 30px;
    transition: all 0.3s ease;
    border-radius: 16px;
}

.features a:hover .feature {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.2);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
    transition: transform 0.3s ease;
}

.features a:hover .feature-icon {
    transform: scale(1.2);
}

.feature h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #333;
}

.feature p {
    color: #666;
    line-height: 1.6;
}

/* 欢迎区块 */
.welcome {
    text-align: center;
    padding: 60px 0;
}

.welcome h2 {
    font-size: 36px;
    margin-bottom: 15px;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.welcome p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
}

/* 上传区域 */
.upload-area {
    border: 3px dashed #667eea;
    border-radius: 16px;
    padding: 60px 20px;
    text-align: center;
    background: rgba(102, 126, 234, 0.05);
    transition: all 0.3s ease;
    cursor: pointer;
}

.upload-area:hover {
    background: rgba(102, 126, 234, 0.1);
    border-color: #764ba2;
}

.upload-area .upload-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.upload-area p {
    color: #666;
    font-size: 16px;
}

/* 文件信息展示 */
.file-info-card {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 16px;
    padding: 30px;
    margin: 20px 0;
}

.file-info-item {
    display: flex;
    margin-bottom: 15px;
}

.file-info-item strong {
    min-width: 120px;
    color: #555;
}

.file-info-item span {
    color: #333;
    font-weight: 500;
}

/* 按钮组 */
.button-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}