/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "微软雅黑", sans-serif;
}

/* 移动端适配：页面容器 */
.container {
    width: 95%;
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
    background-color: #f5f5f5;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 1.8rem;
}

/* 输入行样式 */
.input-row {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    gap: 10px;
    flex-wrap: wrap;
}

/* 标签样式 */
.label {
    min-width: 60px;
    font-size: 1.1rem;
    color: #555;
}

/* 公式输入框 - 禁用输入法后样式优化 */
.formula-input {
    flex: 1;
    height: 45px;
    padding: 0 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
    /* 禁用输入法核心样式 + 禁止编辑（靠按键输入） */
    pointer-events: none; /* 禁止点击输入框唤起输入法 */
    background-color: #fff;
}

.formula-input:focus {
    border-color: #409eff;
}

/* 结果文本 */
.result-text {
    min-width: 100px;
    font-size: 1rem;
    color: #666;
}

/* 新增：计算器按键区域样式 */
.calc-keypad {
    margin: 20px 0;
    background-color: #fff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.05);
}

.keypad-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

/* 通用按键样式 */
.key-btn {
    flex: 1;
    height: 50px;
    border: none;
    border-radius: 6px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 数字/括号按键 */
.num-key {
    background-color: #f8f8f8;
    color: #333;
}
.num-key:hover {
    background-color: #e8e8e8;
}

/* 0号按键占两列 */
.zero-key {
    flex: 2;
}

/* 运算符按键 */
.op-key {
    background-color: #409eff;
    color: #fff;
}
.op-key:hover {
    background-color: #337ecc;
}

/* 功能按键（退格、清空） */
.func-key {
    background-color: #f56c6c;
    color: #fff;
}
.func-key:hover {
    background-color: #e64949;
}

/* 确认按键 */
#confirm-key {
    background-color: #67c23a;
    color: #fff;
}
#confirm-key:hover {
    background-color: #52af29;
}

/* 计算按钮 */
.calc-btn {
    width: 100%;
    height: 50px;
    background-color: #409eff;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1.2rem;
    cursor: pointer;
    margin: 20px 0;
    transition: background-color 0.2s;
}

.calc-btn:hover {
    background-color: #337ecc;
}

/* 总计行 */
.total-row {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 10px;
    padding-top: 20px;
    border-top: 1px dashed #ddd;
}

.total-label {
    font-size: 1.2rem;
    font-weight: bold;
    color: #333;
    margin-right: 15px;
}

.total-value {
    font-size: 1.5rem;
    color: #e6a23c;
    font-weight: bold;
}

/* 移动端小屏幕适配 */
@media (max-width: 400px) {
    .input-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .label, .formula-input, .result-text {
        width: 100%;
    }

    .result-text {
        margin-top: 5px;
    }

    /* 手机端按键高度适配 */
    .key-btn {
        height: 45px;
        font-size: 1.1rem;
    }
}