:root {
    --main-bg-color: #e0e5ec;
    --text-color: #4a4a4a;
    --shadow-light: #ffffff;
    --shadow-dark: #a3b1c6;
    --info-color: #1E88E5;
    --warning-color: #EA7A27;
    --danger-color: #E61F1C;
    --text-shadow-opacity: 0.4;
    --shadow-outset: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
    --shadow-outset-small: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
    --shadow-inset: inset 4px 4px 8px var(--shadow-dark), inset -4px -4px 8px var(--shadow-light);
    --shadow-inset-small: inset 2px 2px 4px var(--shadow-dark), inset -2px -2px 4px var(--shadow-light);
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    outline: none;
    border: none;
}

body, h1, h2, h3, h4, h5, h6, p, span, label, input, textarea, button {
    text-shadow: 1px 1px 2px rgba(var(--text-shadow-color, 0, 0, 0), var(--text-shadow-opacity));
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--main-bg-color);
    color: var(--text-color);
    font-size: 0.875rem;
    line-height: 1.65;
    margin: 0;
    min-width: 320px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    border-radius: 10px;
    padding: 1rem;
    box-shadow: var(--shadow-outset);
}

.col-12, .col-md-4, .col-md-10, .col-xl-8 {
    position: relative;
    width: 100%;
}

@media (min-width: 865px) {
    .col-md-4 {
        flex: 0 0 33.33333%;
        width: 33.33333%;
        margin-left: auto;
        margin-right: auto;
    }
    .col-md-10 {
        flex: 0 0 83.33333%;
        width: 83.33333%;
        margin-left: auto;
        margin-right: auto;
    }
}

@media (min-width: 1200px) {
    .col-xl-8 {
        flex: 0 0 66.66667%;
        width: 66.66667%;
        margin-left: auto;
        margin-right: auto;
    }
}

.card {
    background-color: var(--main-bg-color);
    border-radius: 15px;
    box-shadow: var(--shadow-outset);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-label {
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    display: inline-block;
}

.form-control {
    display: block;
    width: 100%;
    height: calc(2.125rem + 2px);
    font-weight: 700;
    color: var(--text-color);
    background-color: var(--main-bg-color);
    border: none;
    border-radius: 10px;
    box-shadow: var(--shadow-inset);
    font-size: 1rem;
}

.btn {
    font-weight: 700;
    padding: 0.4375rem 1.125rem;
    line-height: 1.25rem;
    border-radius: 10px;
    transition: all 0.2s ease;
    background-color: var(--main-bg-color);
    color: var(--text-color);
    box-shadow: var(--shadow-outset);
}

.btn:hover {
    box-shadow: var(--shadow-outset-small);
}

.btn:active {
    box-shadow: var(--shadow-inset);
    transform: translateY(2px);
}

.btn-block {
    width: 100%;
}

.nk-content {
    padding: 6rem 0rem;
}

#range-slider {
    margin: 24px auto;
    box-shadow: var(--shadow-inset-small);
    background-color: var(--main-bg-color);
}

#range-slider .range-slider__range {
    border-radius: 5px;
    box-shadow: var(--shadow-inset-small);
    background-color: var(--shadow-dark);
}

#range-slider .range-slider__thumb {
    background-color: var(--main-bg-color);
    box-shadow: var(--shadow-outset-small);
}

.number-spinner {
    text-align: center;
}

/* Neumorphic app container */
#app {
    transform: scale(1.10);
    background-color: var(--main-bg-color);
    padding: 20px;
    margin: 20px auto;
    max-width: 1200px;
    width: calc(100% / 1.10);
}

/* Utility classes */
.mt-4 {
    margin-top: 1.5rem !important;
}

.text-info {
    color: var(--info-color) !important;
}

.text-warning {
    color: var(--warning-color) !important;
}

.text-danger {
    color: var(--danger-color) !important;
}

#range-slider .range-slider__thumb[data-lower] {
    width: 0;
}

.btn-dim.btn-outline-secondary.running {
    box-shadow: var(--shadow-inset);
}