/* Settings */
:root {
    --baseline: 28px;
    --color-nuotron: #f35635;
    --color-background: #292e43;
    --color-text-normal: #fff;
    --color-text-low: rgba(255, 255, 255, 0.63);
    --color-selection: rgba(0, 0, 0, 0.21);
    --font-family: 'Vazirmatn', 'Muli', sans-serif;
    --font-weight-regular: 400;
    --font-weight-bold: 800;
    --font-size-headline: 48px;
    --font-size-body: 18px;
    --transition-easing: cubic-bezier(0.190, 1.000, 0.220, 1.000);
    --transition-duration: 1.2s;
    --nuotron-size: calc(var(--baseline) * 3);
    --nuotron-stroke: 18px;
    --nuotron-dot: 24px;
    --nuotron-duration: var(--transition-duration);
    --nuotron-twist: 4;
    --nuotron-rotation: 45deg;
}

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

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    position: relative;
    direction: rtl;
    text-align: center;
    font-family: var(--font-family);
    font-size: var(--font-size-body);
    font-weight: var(--font-weight-regular);
    line-height: var(--baseline);
    background-color: var(--color-background);
    color: var(--color-text-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

::selection {
    background-color: var(--color-selection);
    color: var(--color-text-normal);
}

::-moz-selection {
    background-color: var(--color-selection);
    color: var(--color-text-normal);
}

/* Nuotron */
#nuotron {
    position: absolute;
    top: 50%;
    left: 50%;
    width: var(--nuotron-size);
    height: var(--nuotron-size);
    margin-top: calc(var(--nuotron-size) * -0.5);
    margin-left: calc(var(--nuotron-size) * -0.5);
    transform: rotate(var(--nuotron-rotation));
    z-index: 1;
}

#nuotron *,
#nuotron *:before {
    display: block;
    position: absolute;
}

#nuotron .ellipse,
#nuotron .dot {
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

/* Ellipse */
#nuotron .ellipse {
    border: var(--nuotron-stroke) solid var(--color-nuotron);
    border-radius: 50%;
}

/* Dot */
#nuotron .dot {
    animation: dotRotate calc(var(--nuotron-duration) * var(--nuotron-twist)) linear infinite;
}

#nuotron .dot:before {
    content: '';
    top: calc((var(--nuotron-dot) + var(--nuotron-stroke)) * -1);
    left: 50%;
    width: var(--nuotron-dot);
    height: var(--nuotron-dot);
    margin-left: calc(var(--nuotron-dot) * -0.5);
    border-radius: 50%;
    background-color: var(--color-nuotron);
    animation: dotEffect var(--nuotron-duration) ease-in-out infinite;
}

@keyframes dotRotate {
    100% {
        transform: rotate(360deg);
    }
}

@keyframes dotEffect {
    0%, 50%, 100% {
        transform: scale(1);
    }
    25% {
        transform: scale(0.5);
    }
    50% {
        top: calc(var(--nuotron-size) + var(--nuotron-stroke));
    }
    75% {
        transform: scale(1.5);
    }
}

/* Text */
#text {
    --nuotron-safe-area: calc(var(--nuotron-size) + var(--nuotron-stroke) * 2 + var(--nuotron-dot) * 2 + var(--baseline) * 0.5);
    position: absolute;
    top: 50%;
    left: 50%;
    width: var(--nuotron-safe-area);
    height: var(--nuotron-safe-area);
    margin-top: calc(var(--nuotron-safe-area) * -0.5);
    margin-left: calc(var(--nuotron-safe-area) * -0.5);
    text-decoration: none;
    color: inherit;
    z-index: 2;
}

#text > * {
    display: block;
    position: absolute;
    white-space: nowrap;
    transition: all var(--transition-duration) var(--transition-easing);
}

/* Hover and Website */
#text .hover,
#text .website {
    top: 100%;
    left: 50%;
    letter-spacing: 2px;
    transform: translateX(-50%);
    color: var(--color-text-low);
    font-size: var(--font-size-body);
}

#text .website {
    margin-top: var(--baseline);
    opacity: 0;
}

/* Nuotron and Agency */
#text .nuotron,
#text .agency {
    font-size: var(--font-size-headline);
    font-weight: var(--font-weight-bold);
    line-height: var(--nuotron-safe-area);
    letter-spacing: 30px;
    color: var(--color-text-normal);
    opacity: 0;
}

#text .nuotron {
    right: 100%;
    margin-right: -34px;
}

#text .agency {
    left: 100%;
}

/* Text Hover */
#text:hover .nuotron,
#text:hover .agency {
    letter-spacing: 14px;
    opacity: 1;
}

#text:hover .nuotron {
    margin-right: -18px;
}

#text:hover .hover {
    margin-top: var(--baseline);
    opacity: 0;
}

#text:hover .website {
    margin-top: 0;
    opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --font-size-headline: 32px;
        --font-size-body: 16px;
        --baseline: 24px;
    }
    
    #text .nuotron,
    #text .agency {
        letter-spacing: 15px;
    }
    
    #text:hover .nuotron,
    #text:hover .agency {
        letter-spacing: 8px;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-headline: 24px;
        --font-size-body: 14px;
        --baseline: 20px;
    }
    
    #text .nuotron,
    #text .agency {
        letter-spacing: 10px;
    }
    
    #text:hover .nuotron,
    #text:hover .agency {
        letter-spacing: 5px;
    }
}