/* Ekran ladowania strony (pierwsze wejscie w sesji) - ciemny motyw strony: poswiaty w kolorze logo,
   horyzont jak na stronie glownej, logo z pulsujacym blaskiem, nazwa i pasek postepu */

:root {
    --sl-grain: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .55 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

/* ------------------------------------------------------------ ekran ladowania (raz na sesje) */

.sl-intro {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: none;
    place-items: center;
    background: #04070c;
    color: #fff;
    overflow: hidden;
}

html.sl-intro-on .sl-intro {
    display: grid;
}

html.sl-intro-on body {
    overflow: hidden;
}

/* poswiaty: z gory i z bokow, powoli plyna */
.sl-intro__glow {
    position: absolute;
    inset: -10%;
    pointer-events: none;
}

.sl-intro__glow i {
    position: absolute;
    border-radius: 50%;
    filter: blur(70px);
    opacity: 0;
    animation: sl-glow-in 1.6s ease forwards, sl-drift 9s ease-in-out infinite alternate;
}

.sl-intro__glow i:nth-child(1) {
    left: 25%;
    top: -18%;
    width: 50%;
    height: 55%;
    background: radial-gradient(closest-side, rgba(30, 110, 180, .75), transparent);
}

.sl-intro__glow i:nth-child(2) {
    left: -8%;
    top: 40%;
    width: 42%;
    height: 50%;
    background: radial-gradient(closest-side, rgba(88, 176, 230, .32), transparent);
    animation-delay: .15s, -3s;
}

.sl-intro__glow i:nth-child(3) {
    right: -8%;
    top: 30%;
    width: 40%;
    height: 50%;
    background: radial-gradient(closest-side, rgba(30, 110, 180, .4), transparent);
    animation-delay: .3s, -6s;
}

/* horyzont: luk planety u dolu z jasna krawedzia */
.sl-intro__horizon {
    position: absolute;
    left: 50%;
    bottom: -62vh;
    width: max(160vw, 1400px);
    height: 90vh;
    border-radius: 50%;
    transform: translate(-50%, 60px);
    background: radial-gradient(60% 55% at 50% 0%, rgba(30, 110, 180, .35), #04070c 70%);
    box-shadow:
        0 -1px 0 rgba(181, 226, 255, .55),
        0 -18px 60px -10px rgba(88, 176, 230, .55),
        0 -60px 160px -20px rgba(30, 110, 180, .55);
    opacity: 0;
    animation: sl-intro-rise 1.4s var(--sl-ease, cubic-bezier(.22, 1, .36, 1)) .1s forwards;
}

.sl-intro::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: var(--sl-grain);
    opacity: .07;
    mix-blend-mode: overlay;
    pointer-events: none;
}

.sl-intro__box {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    margin-top: -6vh;
}

/* logo z blaskiem i pulsujacymi kregami */
.sl-intro__mark {
    position: relative;
    display: grid;
    place-items: center;
    width: 150px;
    height: 150px;
}

.sl-intro__mark::before {
    content: '';
    position: absolute;
    inset: -30px;
    border-radius: 50%;
    background: radial-gradient(closest-side, rgba(88, 176, 230, .45), transparent);
    filter: blur(8px);
    animation: sl-intro-breathe 2.4s ease-in-out infinite;
}

.sl-intro__mark b {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 1px solid rgba(140, 205, 245, .5);
    opacity: 0;
    animation: sl-ring 2.4s cubic-bezier(.2, .7, .3, 1) infinite;
}

.sl-intro__mark b:nth-of-type(2) {
    animation-delay: 1.2s;
}

.sl-intro__logo {
    position: relative;
    width: 124px;
    height: 124px;
    object-fit: contain;
    filter: drop-shadow(0 0 24px rgba(88, 176, 230, .55)) drop-shadow(0 12px 28px rgba(0, 0, 0, .5));
    animation: sl-pop 1s var(--sl-ease, cubic-bezier(.22, 1, .36, 1)) both;
}

.sl-intro__name {
    display: flex;
    font-size: clamp(30px, 5vw, 54px);
    font-family: 'Sora', system-ui, sans-serif;
    font-weight: 700;
    letter-spacing: -.03em;
    line-height: 1.1;
}

.sl-intro__name span {
    display: inline-block;
    opacity: 0;
    background: linear-gradient(180deg, #fff 35%, #9fd6f7);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    transform: translateY(.5em);
    filter: blur(6px);
    animation: sl-letter .8s var(--sl-ease, cubic-bezier(.22, 1, .36, 1)) forwards;
    animation-delay: calc(var(--i) * 40ms + 300ms);
    white-space: pre;
}

.sl-intro__foot {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    opacity: 0;
    animation: sl-fade .6s ease .6s forwards;
}

.sl-intro__bar {
    position: relative;
    width: 200px;
    height: 3px;
    border-radius: 3px;
    background: rgba(255, 255, 255, .08);
    overflow: hidden;
}

.sl-intro__bar i {
    display: block;
    height: 100%;
    width: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #1e6eb4, #58b0e6 60%, #c8ebff);
    box-shadow: 0 0 14px rgba(88, 176, 230, .9);
    transform: scaleX(0);
    transform-origin: 0 50%;
    animation: sl-load 1.4s cubic-bezier(.65, 0, .35, 1) .25s forwards;
}

.sl-intro__foot small {
    color: rgba(200, 230, 250, .45);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .32em;
    text-transform: uppercase;
}

@keyframes sl-glow-in {
    to { opacity: 1; }
}

@keyframes sl-drift {
    to { translate: 4% 6%; }
}

@keyframes sl-intro-rise {
    to {
        opacity: 1;
        transform: translate(-50%, 0);
    }
}

@keyframes sl-intro-breathe {
    50% {
        opacity: .55;
        transform: scale(.9);
    }
}

@keyframes sl-ring {
    0% {
        opacity: .9;
        transform: scale(.8);
    }

    100% {
        opacity: 0;
        transform: scale(1.55);
    }
}

@keyframes sl-pop {
    from {
        opacity: 0;
        transform: scale(.7);
        filter: blur(10px);
    }
}

@keyframes sl-letter {
    to {
        opacity: 1;
        transform: none;
        filter: none;
    }
}

@keyframes sl-fade {
    to { opacity: 1; }
}

@keyframes sl-load {
    to { transform: scaleX(1); }
}

/* wyjscie: tresc lekko sie przybliza i rozmywa, ekran gasnie, horyzont wznosi sie */
.sl-intro.is-leaving {
    animation: sl-out .9s cubic-bezier(.65, 0, .35, 1) forwards;
}

.sl-intro.is-leaving .sl-intro__box {
    animation: sl-box-out .6s ease forwards;
}

.sl-intro.is-leaving .sl-intro__horizon {
    transition: transform .9s cubic-bezier(.65, 0, .35, 1);
    transform: translate(-50%, -18vh);
}

@keyframes sl-out {
    60% { opacity: 1; }
    to {
        opacity: 0;
        visibility: hidden;
    }
}

@keyframes sl-box-out {
    to {
        opacity: 0;
        transform: scale(1.08);
        filter: blur(8px);
    }
}

@media (prefers-reduced-motion: reduce) {
    html.sl-intro-on .sl-intro {
        display: none;
    }
}