body {
    font-family: sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background-color: #121212;
    color: #e0e0e0;
}

#word-container {
    text-align: center;
    margin-bottom: 20px;
}

#russian-word {
    font-size: 2em;
    margin-bottom: 10px;
}

#sentence {
    font-style: italic;
    color: #aaa;
    margin-bottom: 10px;
}

#gender {
    font-style: italic;
    color: #888;
    margin-bottom: 20px;
}

#english-input {
    padding: 10px;
    font-size: 1em;
    width: 250px;
    margin-bottom: 10px;
    background-color: #333;
    color: #e0e0e0;
    border: 1px solid #555;
    border-radius: 5px;
}

#feedback {
    margin-top: 10px;
    font-size: 1.5em;
}

button {
    padding: 10px 20px;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin: 5px;
    transition: background-color 0.3s;
}

#submit-btn {
    background-color: #4CAF50; /* Green */
    color: white;
}

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

#unknown-btn {
    background-color: #f44336; /* Red */
    color: white;
}

#unknown-btn:hover {
    background-color: #da190b;
}

#next-btn {
    background-color: #008CBA; /* Blue */
    color: white;
}

#next-btn:hover {
    background-color: #007ba7;
}

#last-word-container {
    display: none;
    margin-top: 40px;
    padding: 20px;
    border: 1px solid #555;
    border-radius: 10px;
    background-color: #222;
    text-align: center;
}

#last-word-container h3 {
    margin-top: 0;
    color: #aaa;
}

#last-russian-word {
    font-size: 1.5em;
    color: #e0e0e0;
}

#last-plural-form {
    font-size: 1.1em;
    color: #61dafb;
}

#last-gender {
    font-style: italic;
    color: #888;
}