:root {
    --calculator-title-color: #008cff;
    --calculator-active-color: #3260ea;
    --calculator-inactive-color: #333333;
    --calculator-bg-color: #494949;
    --calculator-screen-color: #222222;
    --calculator-text-color: #eeeeee;
    --calculator-text-gray-color: #aaaaaa;
    --calculator-text-scroll-color: #666666;
    --calculator-button-color: #f2f2f2;
    --calculator-button-bg-color: #333333;
    --calculator-focus-color: #ffffff;
}

.main .title-container {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    overflow: auto hidden;
    height: 70px;
}

.main .title-container .title {
    margin: 0;
    padding: 0;
    font-size: 30px;
    color: var(--calculator-title-color);
}

.main .calculator-wrapper {
    width: 100%;
    height: calc(100vh - 140px);
    overflow: auto;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.main .calculator-container {
    aspect-ratio: 9 / 16;
    width: 95%;
    height: fit-content;
    touch-action: manipulation;
}

.main .calculator {
    width: 100%;
    height: 100%;
    padding: 4%;
    background: #494949;
    border-radius: min(30px, min(5vw, 4vh));
    transition: all 0.25s ease-in-out;
}

.main .calculator .button {
    --webkit-tap-highlight-color: transparent;
    --webkit-touch-callout: none;
    --webkit-text-size-adjust: 100%;
}

.main .calculator :focus-visible {
    outline: 2px solid var(--calculator-focus-color);
}


/* 全局重置 */
.main .calculator * {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
}

/* 模式切换 */
.main .calculator .mode {
    /* position: relative; */
    width: 100%;
    height: 6%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4%;
}

/* 隐藏原生单选 */
.main .calculator .mode input {
    appearance: none;
    position: absolute;
    top: auto;
    left: 50vw;
    z-index: -2;
}

.main .calculator .mode input:focus {
    outline: none;
}

/* 模式标签 */
.main .calculator .mode label {
    width: 40%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5vw;
    border-radius: 12px;
    background-color: var(--calculator-inactive-color);
    color: var(--calculator-text-color);
    cursor: pointer;
}

.main .calculator .mode input:checked+label {
    background-color: var(--calculator-active-color);
    font-weight: bold;
}

.main .calculator .mode input:focus-visible+label {
    outline: 2px solid var(--calculator-focus-color);
}

/* 显示屏 */
.main .calculator .screen {
    width: 100%;
    height: 22%;
    margin: 4% 0;
    padding: 6%;
    background-color: var(--calculator-screen-color);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
    justify-content: center;
    gap: 6%;
}

.main .calculator .screen .field {
    width: 100%;
    white-space: nowrap;
    overflow: auto hidden;
    scrollbar-width: thin;
    background-color: transparent;
    text-align: right;
    scroll-behavior: smooth;
}

/* 表达式 */
.main .calculator .screen .expression {
    font-size: 5vw;
    color: var(--calculator-text-color);
}

/* 结果 */
.main .calculator .screen .result {
    font-size: 8vw;
    font-weight: bold;
    color: var(--calculator-text-color);
}

/* 按钮网格 */
.main .calculator .operation {
    width: 100%;
    height: 55%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3%;
}

.main .calculator .operation.scientific {
    display: none;
    grid-template-columns: repeat(5, 1fr);
}

/* 按钮 */
.main .calculator .operation .button {
    aspect-ratio: 1 / 1;
    width: 100%;
    height: 100%;
    font-size: 6vw;
    border-radius: 50%;
    background-color: var(--calculator-button-bg-color);
    color: var(--calculator-button-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
}

.main .calculator .operation .button:active {
    opacity: 0.8;
}

/* 运算符按钮高亮 */
.main .calculator .operation.normal .button:nth-child(4n) {
    background-color: var(--calculator-active-color);
    font-weight: bold;
}

.main .calculator .operation.scientific .button:nth-child(5n) {
    background-color: var(--calculator-active-color);
    font-weight: bold;
}

@media (min-aspect-ratio: 9 / 19) {
    .main .calculator-container {
        width: fit-content;
        height: 99%;
    }

    .main .calculator .screen {
        margin: 1.8vh 0;
    }

    .main .calculator .mode label {
        font-size: 1.9vh;
    }

    .main .calculator .screen .expression {
        font-size: 2.7vh;
    }

    .main .calculator .screen .result {
        font-size: 4.5vh;
    }

    .main .calculator .operation .button {
        font-size: 3.2vh;
    }
}