#start {
    min-height: 100vh;
}

.hero {
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero video {
    position: fixed;
    top: 50%;
    left: 50%;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    transform: translate(-50%, -50%);
    z-index: -2;
    transition: filter 3s;
}

.hero video.blur {
    filter: blur(20px) brightness(0.3);
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(-10%);
    }
    to {
        opacity: 1;
        transform: translateY(0%);
    }
}

.hero-content {
    z-index: 1;
    align-items: center;
    display: flex;
    flex-direction: column;
}

.hero-content img {
    max-width: 420px;
}

.hero-content span {
    max-width: 420px;
    margin-top: -1.2rem;
    margin-bottom: 2rem;
    text-shadow: 0 0 1px black;
    font-weight: bold;
    text-align: center;
}

.hero-content .btn {
    width: 360px;
    text-align: center;
}

.btn-sound {
    position: absolute;
    bottom: 50px;
    right: 20px;
    border: none;
    cursor: pointer;
    transition: all ease-in-out 150ms;
    background: transparent;
    width: 60px;
    height: 60px;
    display: none;
}

.btn-sound.on {
    display: block;
}

.btn-sound:hover {
    transform: rotate(15deg) scale(1.2);
}

@media (max-width: 768px) {
    #start,
    .hero {
        min-height: 100svh;
        height: 100svh;
    }

    .hero-content img {
        max-width: 280px;
    }

    .hero-content span {
        max-width: 300px;
        margin-top: -0.6rem;
        font-size: 1rem;
    }

    .hero-content .btn {
        width: min(100%, 280px);
    }

    .btn-sound {
        width: 46px;
        height: 46px;
        bottom: 20px;
    }
}