*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.game-board{
    width: 100%;
    height: 100vh; 
    border-bottom: 15px solid rgb(16, 78, 4);
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    background: linear-gradient(#42BBEB, #EBAF42);
}

.game-board.to-night {
    animation: toNight 5s forwards;
}

.game-board.to-day {
    animation: toDay 5s forwards;
}

.score{
    position: absolute;
    top: 10px;
    left: 10px;
    font-size: 24px;
    font-weight: bold;
    color: white;
    text-shadow: 2px 2px 4px black;
    z-index: 10;
    user-select: none;
}

.best-score{
    position: absolute;
    top: 35px;
    left: 10px;
    font-size: 22px;
    font-weight: bold;
    color: rgb(210, 221, 115);
    text-shadow: 2px 2px 4px black;
    z-index: 10;
    user-select: none;
}

.mario{
    width: 150px;
    position: absolute;
    bottom: 0;
    z-index: 2;   
}

.pipe{
    position: absolute;
    bottom: 0;
    width: 80px;
    animation: pipe-animation 1.5s infinite linear;
    z-index: 1;
}

.jump{
    animation: jump 500ms ease-out;
}

.clouds{
    position: absolute;
    top: 60px;
    right: -550px;
    width: 550px;
    animation: clouds-animation 20s infinite linear;
    z-index: 0;
}

.game-over-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 36px;
    font-weight: bold;
    z-index: 100;
    display: none; 
    font-family: inherit; 
    text-align: center;
    padding: 0 20px;
}

.game-over-screen button {
    margin-top: 20px;
    padding: 12px 28px;
    font-size: 20px;
    font-weight: bold;
    font-family: inherit; 
    border: none;
    border-radius: 8px;
    background-color: #b8973e; 
    color: white;
    cursor: pointer;
    box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.5);
    transition: background-color 0.3s ease;
    user-select: none;
}

.game-over-screen button:hover {
    background-color: #a59456;
}

@keyframes pipe-animation {
    from { right: 0; }
    to { right: 100%; }
}

@keyframes jump {
    0% { bottom: 0; }
    40%, 50%, 60% { bottom: 180px; }
    100% { bottom: 0; }
}

@keyframes clouds-animation {
    from { right: -550px; }
    to { right: 100%; }
}

@keyframes toNight {                /* essa animação ocorre a cada 30 segundos, tanto pra noite quanto pro dia */
    0% {
        background: linear-gradient(#42BBEB, #EBAF42); /* sai do dia e vai ficando de noite */
    }
    40%{
        background: linear-gradient(#1e97c7, #9e721f);
    }
    50% {
        background: linear-gradient(#1a3e7a, #442e0c); 
    }
    100% {
        background: linear-gradient(#0b1d51, #000814); 
    }
}

@keyframes toDay {
    0% {
        background: linear-gradient(#0b1d51, #000814); /* sai da noite pro dia apos a animação de deixar noite */
    }
    50% {
        background: linear-gradient(#1a3e7a, #442e0c); 
    }
    60%{
        background: linear-gradient(#1e97c7, #9e721f);
    }
    100% {
        background: linear-gradient(#42BBEB, #EBAF42); 
    }
}

/* responsividade pra cll */
@media (max-width: 600px) {
    .mario {
        width: 90px; 
        bottom: 0;
    }
    .pipe {
        width: 50px;
        animation-duration: 1.25s; 
    }
    .clouds {
        width: 300px;
        top: 30px;
        animation-duration: 30s;
    }
    .jump {
    animation-name: jump-mobile;
    animation-duration: 500ms;
    animation-timing-function: ease-out;
    }
    .score {
        font-size: 18px;
        top: 5px;
        left: 5px;
    }
    .best-score {
        font-size: 16px;
        top: 28px;
        left: 5px;
    }
    .game-over-screen {
        font-size: 28px;
        padding: 0 10px;
    }
    .game-over-screen button {
        font-size: 18px;
        padding: 10px 24px;
    }
}

@keyframes jump-mobile {
    0% { bottom: 0; }
    20% { bottom: 200px; }  /* fiz uma animação pro mario conseguir ultrapassar o pipe em telas pequenas */
    40% { bottom: 240px; }  
    60% { bottom: 240px; }  
    80% { bottom: 240px; }  
    90% { bottom: 240px; } 
    95% { bottom: 220px; }  
    100% { bottom: 0; }
    }