/* Базови настройки */
:root {
    --font-family: "Open Sans", serif;
    --font-size: 16px;
    --line-height: 1.5;
    --bg-color: #f9f9f9;
    --container-bg: #fff;
    --border-radius: 8px;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.2);
    --input-border: #ccc;
    --input-padding: 10px;
    --currency-label-color: #666;
    --calc-width: 200px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--bg-color);
    font-family: var(--font-family);
    font-size: var(--font-size);
    line-height: var(--line-height);
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 10px;
    padding: 10px 20px;
    background-color: var(--container-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 0 10px var(--shadow-medium);
    text-align: center;
}

/* Заглавия */
h1 {
    margin-bottom: 10px;
    font-size: 26px;
    font-weight: bold;
}

h2 {
    margin: 10px;
    font-size: 18px;
    font-weight: bold;
}

h3 {
    margin-bottom: 10px;
    font-size: 16px;
}

.calculator {
    margin-top: 40px;
}

.calculation {
    margin-bottom: 20px;
    padding: 5px 10px 15px 10px;
    border-radius: var(--border-radius);
    box-shadow: 0 0 4px var(--shadow-light);
    line-height: 1.5em;
}

.calculation label {
    display: block;
    font-weight: 600;
}

.input-with-label {
    position: relative;
    display: inline-block;
    margin-top: 10px;
    width: var(--calc-width);
}

.input-with-label input[type="number"] {
    width: 100%;
    padding: var(--input-padding);
    padding-right: 2.5em;
    margin: 0;
    border: 1px solid var(--input-border);
    border-radius: 10px;
    font-size: 1.2em;
    line-height: 1.2;
}

.input-with-label input[type="text"] {
    width: 100%;
    padding: var(--input-padding);
    padding-right: 2.5em;
    margin: 0;
    border: 1px solid var(--input-border);
    border-radius: 10px;
    font-size: 1.2em;
    line-height: 1.2;
}

.input-with-label .currency-label {
    position: absolute;
    top: 50%;
    right: 0.75em;
    transform: translateY(-50%);
    color: var(--currency-label-color);
    pointer-events: none;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

.calculation input[type="text"] {
    width: var(--calc-width);
    padding: var(--input-padding);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    font-size: 1.2em;
    line-height: 1.2;
}

.about-item,
.faq-item,
.about-item-lang {
    text-align: left;
    margin-bottom: 20px;
    padding: 10px;
    border-radius: var(--border-radius);
    box-shadow: 0 0 5px var(--shadow-light);
}

.faq-item,
.about-item {
    max-width: 100%;
}

.about-item-lang {
    text-align: center;
}

.about-item-lang a,
.about-item-lang a:link,
.about-item-lang a:visited {
    text-decoration: none;
    color: inherit;
}


ul {
    padding-left: 1.2em;
    margin: 0.5em 0;
}

ul li {
    margin-bottom: 0.5em;
}

@media (max-width: 600px) {
    .input-with-label,
    .calculation input[type="text"] {
        width: 100%;
    }

    h1 {
        font-size: 22px;
    }

    h2 {
        font-size: 16px;
    }
}