* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

body {
    background-color: #f5f7fa;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: 500;
}

textarea, input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    resize: vertical;
    outline: none;
    transition: border-color 0.3s;
}

textarea:focus, input:focus {
    border-color: #409eff;
}

textarea {
    min-height: 150px;
}

.btn-group {
    display: flex;
    gap: 15px;
    margin: 30px 0;
}

/* 结果操作按钮组样式 - 移到最下方 */
.result-btn-group {
    display: flex;
    gap: 15px;
    margin: 30px 0 0; /* 调整外边距，适配最下方布局 */
}

button {
    flex: 1;
    padding: 12px 0;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
    color: #fff;
}

#addBeforeBtn {
    background-color: #409eff;
}

#addBeforeBtn:hover {
    background-color: #337ecc;
}

#addAfterBtn {
    background-color: #67c23a;
}

#addAfterBtn:hover {
    background-color: #529b2e;
}

#copyBtn {
    background-color: #e6a23c;
}

#copyBtn:hover {
    background-color: #d48806;
}

#downloadBtn {
    background-color: #909399;
}

#downloadBtn:hover {
    background-color: #73767a;
}

#clearBtn {
    background-color: #f56c6c;
}

#clearBtn:hover {
    background-color: #e43939;
}

.tip {
    font-size: 12px;
    color: #999;
    margin-top: 5px;
    font-style: italic;
}

.result-tip {
    text-align: center;
    color: #666;
    margin: 10px 0;
    font-weight: 500;
}

/* 数量统计提示样式 */
.count-tip {
    font-size: 13px;
    color: #409eff;
    margin-top: 5px;
    font-weight: 500;
}

/* 4个待添加数据项样式 */
.add-data-group {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.add-data-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.add-data-item input {
    padding: 8px 12px;
    font-size: 13px;
}

.option-btn-group {
    display: flex;
    gap: 5px;
}

.option-btn {
    flex: 1;
    padding: 6px 0;
    font-size: 12px;
    background-color: #f0f2f5;
    color: #666;
    border-radius: 4px;
}

.option-btn:hover {
    background-color: #e5e6eb;
}

/* 关键：选中状态的按钮天蓝色样式 */
.option-btn.selected {
    background-color: #409eff !important; /* 天蓝色 */
    color: #fff !important;
}

/* 随机模式下隐藏输入框，显示标识文本 */
.add-data-item.random-mode input {
    display: none;
}

.random-tag {
    padding: 8px 12px;
    font-size: 13px;
    border: 1px solid #409eff;
    border-radius: 6px;
    background-color: #ecf5ff;
    color: #409eff;
    display: none;
}

.add-data-item.random-mode .random-tag {
    display: block;
}

/* 重置按钮样式 */
.reset-btn {
    background-color: #909399 !important;
}

.reset-btn:hover {
    background-color: #73767a !important;
}