/* 全局样式 */
:root {
    --primary-color: #007AFF;
    --text-color: #333333;
    --background-color: #F5F5F7;
    --card-background: #FFFFFF;
    --border-radius: 12px;
    --spacing: 20px;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing);
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 40px;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
}

/* 上传区域样式 */
.upload-area {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 40px;
    text-align: center;
    border: 2px dashed #ddd;
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.upload-inner {
    max-width: 400px;
    margin: 0 auto;
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 20px;
}

.upload-btn {
    color: var(--primary-color);
    background: none;
    border: none;
    cursor: pointer;
    font-size: inherit;
    padding: 0;
    text-decoration: underline;
}

.upload-hint {
    color: #666;
    font-size: 0.9rem;
    margin-top: 8px;
}

/* 预览区域样式 */
.preview-area {
    margin-top: var(--spacing);
}

.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing);
    margin-bottom: var(--spacing);
}

.preview-box {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: var(--spacing);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.preview-box h3 {
    margin-bottom: 16px;
    font-size: 1.2rem;
}

.image-container {
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
    border-radius: 8px;
    background-color: #f0f0f0;
}

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

.image-info {
    margin-top: 16px;
    font-size: 0.9rem;
    color: #666;
}

/* 压缩控制区域样式 */
.compress-controls {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: var(--spacing);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.quality-control label {
    display: block;
    margin-bottom: 8px;
}

input[type="range"] {
    width: 100%;
    margin: 8px 0;
}

.download-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 24px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

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