body, html {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #222;
    color: white;
    height: 100%;
}


#splash-screen {
    background-image: url('giphy.gif');  
    background-size: cover;
    background-position: center;
}
#inputTitlePage{
    background-image: url('giphy.gif');    
    background-size: cover;
    background-position: center;
}

#addCardPage{
    background-image: url('giphy.gif');   
    background-size: cover;
    background-position: center;
}

#main-page {
    background-image: url('w3n46nk83ir81.gif'); 
    background-size: cover;
    background-position: center;
    
}

.hidden {
    display: none;
}
.centered {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh; 
}

button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 10px; 
    background-color: #555;
    color: white;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #777;
}

.hidden {
    display: none;
}

#title2 {
    animation: moveUp 2s forwards;
    position: relative;
}

#title3 {
    animation: moveUp 4s forwards;
    position: relative;
}

@keyframes moveUp {
    0% {
        transform: translateY(0);
    }
    100% {
        transform: translateY(calc(-400% + 20px));
    }
}

#aboutPage {
    justify-content: center; 
    align-items: center; 
    text-align: center; 
    background-image: url('giphy.gif');    
    background-size: cover;
    background-position: center;
}

#aboutPage .title {
    font-size: 24px; 
    margin-bottom: 20px; 
}

#title4 {
    font-size: 20px; 
}

addCardPage

#aboutPage button {
    padding: 8px 16px; 
    font-size: 16px; 
    cursor: pointer; 
    border: none; 
    border-radius: 10px; 
    background-color: #555; 
    color: white; 
    margin-top: 20px; 
}

#aboutPage button:hover {
    background-color: #777; 
}


.header {
    display: flex;
    align-items: center;
}

#settingsBtn {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1; 
    background-color: #555;
    color: white;
}

.settings-menu {
    position: fixed;
    top: 58px;
    left: 23px;
    background-color: #333;
    border: 1px solid #555;
    padding: 0;
    z-index: 1; 
}

.settings-menu ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

.settings-menu li {
    padding: 5px 0;
}

.settings-menu button {
    background-color: #333;
    color: white;
    border: none;
    padding: 10px;
    width: 100%;
    text-align: left;
}

.settings-menu button:hover {
    background-color: #444;
}

.generate-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: #555;
    color: white;
}

.add-card-btn {
    font-size: 48px;
    cursor: pointer;
    border: none;
    border-radius: 50%; 
    background-color: #555;
    color: white;
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}

.add-card-btn:hover {
    background-color: #777;
}

.complete-btn {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    border-radius: 10px;
    background-color: #4CAF50;
    color: white;
    margin-top: 20px;
}

.complete-btn:hover {
    background-color: #45a049;
}

#flashcardsDisplay {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.flashcards-container-main {
    width: 300px;
    height: 200px;
    perspective: 1000px;
    margin-bottom: 20px;
}

.card-form {
    display: flex;
    flex-direction: column;
    align-items: center; 
}

.add-card-btn {
    font-size: 48px;
    cursor: pointer;
    border: none;
    border-radius: 50%; 
    background-color: #555;
    color: white;
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 20px;
}


.flashcard {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s;
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 10px;
    background-color: #333;
    color: white;
    box-sizing: border-box;
    padding: 10px;
    font-size: 16px;
}

.card-front {
    transform: rotateY(0deg);
}

.card-back {
    transform: rotateY(180deg);
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.decks-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 20px;
}

.deck {
    background-color: #333;
    color: white;
    padding: 15px;
    margin: 10px;
    border-radius: 10px;
    width: 300px;
    cursor: pointer;
    text-align: center;
    transition: background-color 0.3s ease;
    position: relative;
}

.deck:hover {
    background-color: #555;
}

.delete-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: #c94239;
    color: white;
    border: none;
    padding: 5px;
    cursor: pointer;
    border-radius: 20%;
}

.delete-btn:hover {
    background-color: #c94239;
}