* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: #000;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    font-family: "Poppins", sans-serif;
    position: relative;
}

/* Pozycjonowanie i styl linku w LEWYM górnym rogu */
.top-left-link {
    position: absolute;
    top: 25px;
    left: 35px;
    
    font-size: clamp(20px, 3vw, 40px);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    text-decoration: none;
    cursor: pointer;
    z-index: 10;
}

/* Tęczowy tekst i opływowe świecenie */
.glow-text {
    background: linear-gradient(
        90deg,
        #ff0000,
        #ff8800,
        #ffee00,
        #00ff55,
        #00d9ff,
        #0044ff,
        #aa00ff,
        #ff0088,
        #ff0000
    );
    background-size: 400%;

    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;

    animation:
        rainbow 6s linear infinite,
        glow 2s ease-in-out infinite alternate;
    
    transition: transform 0.2s ease;
}

.glow-text:hover {
    transform: scale(1.05);
}

/* Animacja przesuwania kolorów */
@keyframes rainbow {
    0% {
        background-position: 0%;
    }
    100% {
        background-position: 400%;
    }
}

/* Neonowe świecenie */
@keyframes glow {
    from {
        filter:
            drop-shadow(0 0 8px red)
            drop-shadow(0 0 15px orange)
            drop-shadow(0 0 20px yellow);
    }
    to {
        filter:
            drop-shadow(0 0 15px cyan)
            drop-shadow(0 0 30px magenta)
            drop-shadow(0 0 50px blue);
    }
}

/* Podpis na dole */
.credit {
    position: absolute;
    bottom: 25px;
    left: 50%;
    transform: translateX(-50%);

    color: #888;
    font-size: clamp(14px, 1.5vw, 20px);
    font-weight: 400;
    letter-spacing: 1px;

    text-align: center;
    opacity: 0.9;
}