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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #667eea;
    min-height: 100vh;
}

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #4a5568;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-info {
    color: #4a5568;
    font-weight: 500;
}

.nav-btn {
    padding: 0.5rem 1rem;
    border: 2px solid #667eea;
    background: transparent;
    color: #667eea;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: #667eea;
    color: white;
}

/* 主要内容区域 */
.main-content {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* 表单区域样式 */
.form-section {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    margin: 2rem auto;
}

.form-section h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #4a5568;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: #4a5568;
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 0.75rem;
    border: 2px solid #e2e8f0;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin: 0;
}

/* 按钮样式 */
.btn-primary {
    background-color: #667eea;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.btn-secondary {
    background: #e2e8f0;
    color: #4a5568;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: #cbd5e0;
}

.btn-danger {
    background: #e53e3e;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-danger:hover {
    background: #c53030;
}

/* 用户面板样式 */
.user-panel {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.user-panel h2 {
    color: #4a5568;
    margin-bottom: 1rem;
}

.user-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* 用户管理区域 */
.user-management-section {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

/* 文档管理区域 */
.documents-section {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.section-header h2 {
    color: #4a5568;
}

/* 文档列表样式 */
.documents-list {
    display: grid;
    gap: 1rem;
}

.document-item {
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.document-item:hover {
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.document-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.document-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 0.5rem;
}

.document-meta {
    display: flex;
    gap: 1rem;
    color: #718096;
    font-size: 0.875rem;
}

.document-description {
    color: #4a5568;
    margin-bottom: 0.5rem;
}

.document-content-preview {
    color: #718096;
    font-size: 0.875rem;
    line-height: 1.4;
    max-height: 3rem;
    overflow: hidden;
    text-overflow: ellipsis;
}

.document-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

/* 模态框样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-content {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
}

.modal-content h3 {
    color: #4a5568;
    margin-bottom: 1.5rem;
}

.close {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: #718096;
}

.close:hover {
    color: #4a5568;
}

/* 用户列表样式 */
.users-list {
    display: grid;
    gap: 1rem;
}

.user-item {
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.user-item:hover {
    border-color: #667eea;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.user-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.user-info {
    flex: 1;
}

.user-username {
    font-size: 1.2rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 0.25rem;
}

.user-email {
    color: #718096;
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.user-fullname {
    color: #4a5568;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.user-meta {
    display: flex;
    gap: 1rem;
    color: #718096;
    font-size: 0.75rem;
}

.user-admin-badge {
    background: #667eea;
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.user-actions {
    display: flex;
    gap: 0.5rem;
}

/* 日志列表样式 */
.logs-list {
    max-height: 400px;
    overflow-y: auto;
}

.log-item {
    background: #f7fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 0.5rem;
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.log-action {
    font-weight: 600;
    color: #2d3748;
}

.log-time {
    color: #718096;
    font-size: 0.875rem;
}

.log-details {
    color: #4a5568;
    font-size: 0.875rem;
}

/* 消息提示样式 */
.message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: 6px;
    color: white;
    font-weight: 500;
    z-index: 3000;
    animation: slideIn 0.3s ease;
}

.message.success {
    background: #48bb78;
}

.message.error {
    background: #f56565;
}

.message.info {
    background: #4299e1;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
    }
    
    .main-content {
        padding: 0 1rem;
        margin: 1rem auto;
    }
    
    .form-section {
        margin: 1rem auto;
        padding: 1.5rem;
    }
    
    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .user-actions {
        flex-direction: column;
    }
    
    .document-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .modal-content {
        width: 95%;
        padding: 1.5rem;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 空状态样式 */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: #718096;
}

.empty-state h3 {
    margin-bottom: 0.5rem;
    color: #4a5568;
}