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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 1200px;
    overflow: hidden;
}

h1 {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin: 0;
    font-size: 2em;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    padding: 30px;
}

.form-section {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
}

.preview-section {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    display: flex;
    flex-direction: column;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #333;
}

.form-group input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input[type="text"]:focus {
    outline: none;
    border-color: #667eea;
}

.style-select {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    background: white;
    cursor: pointer;
    transition: border-color 0.3s;
}

.style-select:focus {
    outline: none;
    border-color: #667eea;
}

.color-pickers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.color-pickers input[type="color"] {
    width: 100%;
    height: 50px;
    border: 2px solid #ddd;
    border-radius: 8px;
    cursor: pointer;
}

.generate-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.4);
}

.preview-container {
    background: white;
    border-radius: 10px;
    padding: 20px;
    min-height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
    border: 2px dashed #ddd;
}

#qrPreview {
    max-width: 100%;
    max-height: 400px;
    /* 移除圆角 */
}

.placeholder {
    text-align: center;
    color: #999;
    font-size: 18px;
}

.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.download-btn, .reset-btn {
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s;
}

.download-btn {
    background: #28a745;
    color: white;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(40, 167, 69, 0.3);
}

.reset-btn {
    background: #dc3545;
    color: white;
}

.reset-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(220, 53, 69, 0.3);
}

/* 样式预览（用于下拉选项的视觉提示） */
.style-preview-square {
    display: inline-block;
    width: 20px;
    height: 20px;
    background: #000;
    margin-right: 5px;
    vertical-align: middle;
}

.style-preview-circle {
    display: inline-block;
    width: 20px;
    height: 20px;
    background: #000;
    border-radius: 50%;
    margin-right: 5px;
    vertical-align: middle;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* 在现有样式基础上添加以下内容 */

.checkbox-group {
    margin-bottom: 25px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: normal;
    color: #333;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 10px;
    cursor: pointer;
    accent-color: #667eea;
}

/* 确保预览图片无圆角 */
#qrPreview {
    max-width: 100%;
    max-height: 400px;
    /* 移除圆角 */
}