:root {
    --primary-color: #4a6cf7;
    --secondary-color: #69b1ff;
    --accent-color: #ff7d00;
    --text-color: #333333;
    --light-gray: #f5f7fa;
    --medium-gray: #e4e7ed;
    --dark-gray: #909399;
    --white: #ffffff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--light-gray);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--white);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--shadow);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 30px;
    font-size: 2.2rem;
    font-weight: 600;
}

.upload-section {
    text-align: center;
    margin-bottom: 40px;
}

.upload-btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(74, 108, 247, 0.3);
}

.upload-btn:hover {
    background-color: #3a5bdb;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 108, 247, 0.4);
}

.upload-btn input {
    display: none;
}

#uploadStatus {
    margin-top: 15px;
    color: var(--dark-gray);
    font-size: 0.9rem;
}

.preview-section {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
}

.input-preview, .output-preview {
    flex: 1;
    min-width: 300px;
}

.preview-section h2 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 500;
}

.image-container {
    border: 2px dashed var(--medium-gray);
    border-radius: 12px;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transition: all 0.3s ease;
}

.image-container img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    display: none;
}

.image-container.has-image {
    border-style: solid;
    border-color: var(--secondary-color);
}

.image-container.has-image img {
    display: block;
}

.process-btn {
    display: block;
    width: 200px;
    margin: 0 auto 30px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 14px 0;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(255, 125, 0, 0.3);
}

.process-btn:hover:not(:disabled) {
    background-color: #e67200;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 125, 0, 0.4);
}

.process-btn:disabled {
    background-color: var(--medium-gray);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.status-section {
    text-align: center;
    padding: 15px;
    border-radius: 8px;
    background-color: var(--light-gray);
    color: var(--dark-gray);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
        border-radius: 12px;
    }

    h1 {
        font-size: 1.8rem;
    }

    .preview-section {
        gap: 20px;
    }

    .process-btn {
        width: 100%;
    }
}