body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 2.5rem;
    background: linear-gradient(90deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    color: #555;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
    margin-top: 0;
}

h3 {
    color: #667eea;
    margin-top: 0;
}

.filter-info {
    background: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
    border: 1px solid #667eea;
    border-radius: 6px;
    padding: 15px 20px;
    margin-bottom: 20px;
    display: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    font-weight: 500;
}

.filter-info.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

.menu {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 30px;
    justify-content: center;
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-success {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    color: white;
}

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

.btn-warning {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ff8e53 100%);
    color: white;
}

.btn-secondary {
    background: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%);
    color: white;
}

.form-container {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 30px;
    border: 1px solid #dee2e6;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #444;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

.form-buttons {
    display: flex;
    gap: 15px;
    margin-top: 25px;
    justify-content: flex-start;
}

.search-options, .filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 25px;
    justify-content: center;
}

.search-form, .filter-form {
    margin-top: 25px;
    padding: 20px;
    background-color: white;
    border-radius: 6px;
    border: 1px solid #dee2e6;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.table-container {
    overflow-x: auto;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    max-height: 70vh;
}

.table-container::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.table-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

.table-container::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 8px 8px 0 0;
}

.loading {
    display: flex;
    align-items: center;
    gap: 10px;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid #ffffff;
    border-top: 2px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0;
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #495057;
    position: sticky;
    top: 0;
}

tr:hover {
    background-color: #f8f9fa;
    transition: background-color 0.2s;
}

tr:nth-child(even) {
    background-color: #fdfdfd;
}

.message {
    padding: 15px 20px;
    margin-top: 20px;
    border-radius: 6px;
    display: none;
    animation: slideIn 0.3s ease-out;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.message.success {
    background: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
    color: #155724;
    border: 1px solid #28a745;
}

.message.error {
    background: linear-gradient(120deg, #ff9a9e 0%, #fad0c4 100%);
    color: #721c24;
    border: 1px solid #dc3545;
}

.message.info {
    background: linear-gradient(120deg, #84fab0 0%, #8fd3f4 100%);
    color: #0c5460;
    border: 1px solid #17a2b8;
}

.icon {
    font-size: 18px;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
        margin: 10px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .menu {
        flex-direction: column;
    }
    
    .menu .btn {
        width: 100%;
        justify-content: center;
    }
    
    .search-options, .filter-options {
        flex-direction: column;
    }
    
    .search-options .btn, .filter-options .btn {
        width: 100%;
        justify-content: center;
    }
    
    .form-buttons {
        flex-direction: column;
    }
    
    .form-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .table-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    th, td {
        padding: 12px 8px;
        font-size: 14px;
    }
    
    .icon {
        font-size: 16px;
    }
    
    .table-container {
        max-height: 60vh;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .form-container {
        padding: 15px;
    }
    
    .search-form, .filter-form {
        padding: 15px;
    }

    .user-welcome-card {
        flex-direction: column;
        align-items: center;
        padding: 8px 12px;
    }

    .user-avatar {
        font-size: 1.2rem;
        margin-bottom: 4px;
    }

    .user-details {
        flex-direction: column;
        align-items: center;
        gap: 2px;
    }

    .username-text {
        font-size: 0.9rem;
    }

    .user-role-text {
        font-size: 0.7rem;
    }
}

/* 文件上传样式 */
.upload-info {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
}

.upload-info h3 {
    color: #495057;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.upload-info ul {
    margin: 10px 0;
    padding-left: 20px;
}

.upload-info li {
    margin-bottom: 5px;
    color: #6c757d;
}

.upload-summary {
    background: #e7f3ff;
    border: 1px solid #b3d9ff;
    border-radius: 6px;
    padding: 15px;
    margin-bottom: 15px;
}

.upload-summary h4 {
    color: #0056b3;
    margin-bottom: 10px;
}

.upload-summary p {
    margin: 5px 0;
    color: #495057;
}

.upload-errors {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 6px;
    padding: 15px;
}

.upload-errors h4 {
    color: #856404;
    margin-bottom: 10px;
}

.error-list {
    max-height: 300px;
    overflow-y: auto;
}

.error-item {
    background: #fff;
    border: 1px solid #f5c6cb;
    border-radius: 4px;
    padding: 10px;
    margin-bottom: 10px;
}

.error-message {
    color: #721c24;
    font-style: italic;
    display: block;
    margin-top: 5px;
}

input[type="file"] {
    width: 100%;
    padding: 8px;
    border: 2px dashed #dee2e6;
    border-radius: 6px;
    background: #f8f9fa;
    cursor: pointer;
    transition: all 0.3s ease;
}

input[type="file"]:hover {
    border-color: #007bff;
    background: #e7f3ff;
}

input[type="file"]:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* 删除按钮样式 */
.btn-danger {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(220, 53, 69, 0.3);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #c82333 0%, #bd2130 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(220, 53, 69, 0.4);
}

.btn-danger:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(220, 53, 69, 0.3);
}

/* 操作按钮容器 */
.action-buttons {
    display: flex;
    gap: 5px;
    align-items: center;
}

/* 确认删除对话框样式增强 */
.confirm-dialog {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* 用户信息卡片样式 */
.user-welcome-card {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 20px;
    border-radius: 25px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    margin-right: 15px;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.user-welcome-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.user-avatar {
    font-size: 1.5rem;
    margin-right: 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.user-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.username-text {
    font-weight: 600;
    font-size: 1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.user-role-text {
    font-size: 0.8rem;
    opacity: 0.9;
    font-weight: 400;
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 8px;
    border-radius: 10px;
    text-align: center;
}