/* 文件上传和数据预览样式 */

/* 文件上传区域 */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: rgba(102, 126, 234, 0.1);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.6;
}

.upload-area p {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.upload-hint {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* 文件信息 */
.file-info {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: var(--border-radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 粘贴区域 */
.paste-area textarea {
    width: 100%;
    height: 200px;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    resize: vertical;
    transition: var(--transition);
}

.paste-area textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.paste-controls {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    align-items: center;
}

/* 示例数据网格 */
.sample-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.sample-item {
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.sample-item:hover {
    border-color: var(--primary-color);
    background-color: rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.sample-item h5 {
    margin: 0 0 0.5rem 0;
    color: var(--text-color);
    font-size: 1.1rem;
}

.sample-item p {
    margin: 0;
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 数据预览 */
.data-preview {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.preview-table-container {
    max-height: 300px;
    overflow: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

#previewTable {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

#previewTable th,
#previewTable td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

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

/* 预览控制 */
.preview-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.chart-type-selector,
.column-mapping {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 消息提示 */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    color: white;
    font-weight: 500;
    z-index: 10001;
    transform: translateX(100%);
    transition: transform 0.3s ease-out;
}

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

.toast-success {
    background-color: #28a745;
}

.toast-error {
    background-color: #dc3545;
}