/* 重置默认样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #FFFFFF;
    color: #000000;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* 页面头部样式 */
.header {
    text-align: center;
    padding: 40px 20px;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.subtitle {
    color: #666666;
    font-size: 1.1rem;
}

/* 主容器样式 */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 上传区域样式 */
.upload-area {
    background-color: #FFFFFF;
    border: 2px dashed #E5E5E5;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 30px;
}

.upload-area:hover {
    border-color: #007AFF;
    background-color: rgba(0, 122, 255, 0.05);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.upload-icon {
    fill: #007AFF;
}

.upload-text {
    font-size: 1.2rem;
    color: #000000;
}

.upload-hint {
    color: #666666;
    font-size: 0.9rem;
}

.file-input {
    display: none;
}

/* 预览区域样式 */
.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.preview-box {
    background-color: #FFFFFF;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.preview-box h3 {
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: #000000;
}

.image-container {
    width: 100%;
    height: 300px;
    border-radius: 8px;
    overflow: hidden;
    background-color: #F5F5F5;
    margin-bottom: 15px;
}

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

.file-info {
    color: #666666;
    font-size: 0.9rem;
}

/* 控制区域样式 */
.controls {
    background-color: #FFFFFF;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.quality-control {
    margin-bottom: 20px;
}

.quality-control label {
    display: block;
    margin-bottom: 10px;
    color: #000000;
}

.slider {
    width: 100%;
    height: 4px;
    background-color: #E5E5E5;
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background-color: #007AFF;
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.download-btn {
    width: 100%;
    padding: 15px;
    background-color: #007AFF;
    color: #FFFFFF;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

/* 加载提示样式 */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid #E5E5E5;
    border-top-color: #007AFF;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .preview-container {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 2rem;
    }

    .upload-area {
        padding: 30px;
    }

    .image-container {
        height: 250px;
    }
}