:root {
    --primary-color: #007AFF;
    --background-color: #F5F5F7;
    --border-radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--background-color);
    color: #1D1D1F;
    line-height: 1.5;
}

/* 修改容器宽度和内边距 */
.container {
    max-width: 1000px;  /* 减小最大宽度 */
    margin: 0 auto;
    padding: 2rem;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

header p {
    color: #6E6E73;
}

/* 优化预览区域样式 */
.preview-section {
    background: white;
    border-radius: var(--border-radius);
    padding: 2.5rem;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);  /* 更柔和的阴影 */
    margin-top: 2rem;
}

.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;  /* 增加间距 */
    margin-bottom: 2.5rem;
    align-items: start;  /* 确保两边对齐 */
}

.preview-box {
    text-align: center;
    background: #F5F5F7;  /* 苹果风格的背景色 */
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: all 0.3s ease;
}

.preview-box h3 {
    font-size: 1rem;
    font-weight: 500;
    color: #1D1D1F;
    margin-bottom: 1rem;
}

.preview-box img {
    max-width: 100%;
    max-height: 400px;  /* 限制图片最大高度 */
    object-fit: contain;
    border-radius: 8px;
    margin: 0.5rem 0;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

.file-info {
    color: #6E6E73;
    font-size: 0.9rem;
}

/* 优化控制区域样式 */
.controls {
    border-top: 1px solid #E5E5E7;  /* 更浅的分隔线 */
    padding-top: 2rem;
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
}

.quality-control {
    background: #F5F5F7;
    padding: 1rem 1.5rem;
    border-radius: 25px;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.quality-control label {
    font-size: 0.9rem;
    color: #1D1D1F;
}

input[type="range"] {
    width: 180px;
    -webkit-appearance: none;
    height: 4px;
    background: #D1D1D6;
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* 下载按钮样式 */
.download-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 25px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 200px;
    justify-content: center;
}

.download-btn:hover {
    background: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.4);
}

.download-icon {
    fill: currentColor;
    transition: transform 0.3s ease;
}

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

/* 优化上传区域样式 */
.upload-area {
    background: white;
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    border: 2px dashed #D1D1D6;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: #F5F5F7;
}

.upload-content svg {
    width: 40px;
    height: 40px;
    margin-bottom: 1rem;
}

.upload-content p {
    margin: 0.5rem 0;
    color: #1D1D1F;
}

.upload-hint {
    font-size: 0.85rem;
    color: #86868B;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .preview-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .preview-box {
        padding: 1rem;
    }
    
    .quality-control {
        flex-direction: column;
        padding: 1rem;
    }
    
    input[type="range"] {
        width: 100%;
    }
}