:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --danger-color: #f44336;
    --border-color: #ccc;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
}

h1 {
    color: #333;
    margin-bottom: 30px;
}

.upload-section {
    display: flex;
    justify-content: space-around;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.upload-box {
    flex: 1;
    min-width: 250px;
    padding: 15px;
    border-radius: 8px;
    background-color: #f5f5f5;
}

.preview {
    width: 200px;
    height: 200px;
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    margin: 10px auto;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    transition: all 0.3s ease;
}

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

input[type="file"] {
    display: none;
}

button {
    padding: 10px 20px;
    margin: 10px;
    cursor: pointer;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.upload-btn {
    background-color: var(--success-color);
    color: white;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
}

.success-btn {
    background-color: var(--success-color);
    color: white;
}

.danger-btn {
    background-color: var(--danger-color);
    color: white;
}

button:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.action-buttons {
    margin-top: 30px;
}

.button-group {
    margin-top: 20px;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .upload-section {
        flex-direction: column;
    }
    
    .upload-box {
        width: 100%;
        margin-bottom: 20px;
    }
}