@font-face {
    font-family: 'Akira';
    src: url('../assets/font/Akira Expanded Demo.otf');
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    animation: bg-rainbow 8s linear infinite;
    font-family: 'Akira', sans-serif;
    text-transform: uppercase;
    display: flex;
    justify-content: center;
    align-items: center;
}

@keyframes bg-rainbow {
    0%   { background-color: #1a0000; }
    25%  { background-color: #001a1a; }
    50%  { background-color: #001a00; }
    75%  { background-color: #1a001a; }
    100% { background-color: #1a0000; }
}

#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: black;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    cursor: pointer;
}

#start-btn {
    background: transparent;
    color: white;
    border: 2px solid white;
    padding: 20px 40px;
    font-size: 1.5rem;
    font-family: 'Akira', sans-serif;
    cursor: pointer;
    transition: 0.3s;
}

#start-btn:hover {
    box-shadow: 0 0 30px white;
    background: white;
    color: black;
}

.main-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    width: 100%;
    text-align: center;
    visibility: hidden;
    z-index: 1;
}

.cat-gif {
    width: 70vw;
    max-width: 400px;
    margin: 20px 0;
    filter: drop-shadow(0 0 20px rgba(255,255,255,0.4));
    transition: filter 0.5s;
}

.neon-text {
    font-size: 8vw;
    letter-spacing: 5px;
    animation: rainbow 4s linear infinite;
    -webkit-text-stroke: 1px currentColor;
    font-weight: 900;
}

@media (min-width: 768px) {
    .neon-text {
        font-size: 3.8rem;
        letter-spacing: 10px;
        -webkit-text-stroke: 2px currentColor;
    }
    #start-btn {
        font-size: 2rem;
    }
}

@keyframes rainbow {
    0%   { color: #ff0000; text-shadow: 0 0 30px #ff0000, 0 0 60px #ff0000; }
    25%  { color: #00ffff; text-shadow: 0 0 30px #00ffff, 0 0 60px #00ffff; }
    50%  { color: #00ff00; text-shadow: 0 0 30px #00ff00, 0 0 60px #00ff00; }
    75%  { color: #ff00ff; text-shadow: 0 0 30px #ff00ff, 0 0 60px #ff00ff; }
    100% { color: #ff0000; text-shadow: 0 0 30px #ff0000, 0 0 60px #ff0000; }
}