.back-link {
    display: inline-block;
    margin-bottom: 1rem;
    color: var(--primary-color);
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

header p {
    color: var(--text-secondary);
}

.upload-area {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.upload-box {
    border: 2px dashed #DEDEDE;
    border-radius: var(--border-radius);
    padding: 3rem;
    cursor: pointer;
    transition: var(--transition);
}

.upload-box:hover {
    border-color: var(--primary-color);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
}

.support-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.preview-container {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.preview-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.image-container {
    border-radius: var(--border-radius);
    overflow: hidden;
    background: #F5F5F7;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-container img {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
}

.file-info {
    margin-top: 1rem;
    color: var(--text-secondary);
}

.controls {
    padding-top: 2rem;
    border-top: 1px solid #DEDEDE;
}

.quality-control {
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    height: 4px;
    background: #DEDEDE;
    border-radius: 2px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.download-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.download-btn:hover {
    background: #0056b3;
}