:root {
    --primary-color: #2E2E2E;
    --secondary-color: #4A4A4A;
    --accent-color: #6A6A6A;
    --background-color: #F5F5F5;
    --text-color: #333333;
    --border-radius: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eaeaea;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

/* 上传区域样式 */
.upload-section {
    margin-bottom: 40px;
}

.upload-area {
    border: 2px dashed var(--accent-color);
    border-radius: var(--border-radius);
    padding: 40px;
    text-align: center;
    background-color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: #f9f9f9;
}

.upload-area.active {
    border-color: #2196F3;
    background-color: #e3f2fd;
}

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

.upload-label {
    color: #2196F3;
    cursor: pointer;
    font-weight: bold;
}

/* 示例按钮样式 */
.example-btn {
    margin-top: 15px;
    padding: 8px 16px;
    background-color: #e9e9e9;
    color: var(--secondary-color);
    border: 1px solid #ccc;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.example-btn:hover {
    background-color: #d9d9d9;
    color: var(--primary-color);
}

/* 预览区域样式 */
.preview-section {
    display: none;
    margin-bottom: 40px;
}

.preview-section h2 {
    text-align: center;
    margin-bottom: 20px;
}

.preview-container {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 30px;
}

.preview-item {
    flex: 1;
    text-align: center;
}

.preview-item h3 {
    margin-bottom: 15px;
}

/* 液态玻璃效果 */
.glass-element {
    fill: url(#glass-fill);
    filter: url(#glass-effect);
    transition: all 0.3s ease;
}

/* 预览框背景 */
.preview-box {
    height: 300px;
    background: linear-gradient(135deg, #0071e3, #34c759);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.preview-box::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, 
        rgba(255, 255, 255, 0.1) 0%,
        rgba(255, 255, 255, 0.05) 100%
    );
    z-index: 1;
}

/* SVG容器样式 */
.preview-box svg {
    position: relative;
    z-index: 2;
    width: 128px;
    height: 128px;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
}

/* 下载选项样式 */
.download-options {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 20px;
}

.size-selector {
    display: flex;
    align-items: center;
    gap: 10px;
}

.size-selector select {
    padding: 8px 12px;
    border-radius: var(--border-radius);
    border: 1px solid var(--accent-color);
    background-color: #fff;
    font-size: 16px;
}

.btn {
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: var(--secondary-color);
}

/* 页脚样式 */
footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eaeaea;
    color: var(--accent-color);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .preview-container {
        flex-direction: column;
    }
    
    .upload-area {
        padding: 20px;
    }
    
    .preview-box {
        height: 250px;
    }
    
    .download-options {
        flex-direction: column;
    }
}

/* 文字阴影效果 */
.text-shadow {
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* 暗色模式适配 */
@media (prefers-color-scheme: dark) {
    .preview-box {
        background: linear-gradient(135deg, #0071e3, #34c759);
    }
}