* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f7fc;
    color: #333;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 20px;
    height: 100vh;
    overflow-y: auto;
}

h1 {
    margin-bottom: 20px;
    font-size: 2rem;
    color: #333;
}

h3 {
    margin-bottom: 10px;
}

input[type="file"] {
    margin-bottom: 10px;
    padding: 10px;
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 4px;
    cursor: pointer;
}

#wordContainer {
    width: 100%;
    max-width: 600px;
    margin-bottom: 20px;
}

.word-pair {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.word-pair label {
    font-size: 1rem;
    font-weight: bold;
    margin-bottom: 5px;
    color: #333;
}

.word-pair input {
    padding: 10px;
    font-size: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 5px;
    transition: border-color 0.3s;
}

.word-pair input:focus {
    border-color: #5cb85c;
    outline: none;
}

#result {
    display: none;
    margin-top: 20px;
    margin-bottom: 10px;
    font-weight: bold;
    color: #333;
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #ccc;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.wrong {
    border-color: red;
    background-color: #f8d7da;
}

.btn-container {
    margin: 20px 0;
    display: flex;
    justify-content: center;
    width: 100%;
}

button {
    padding: 10px 20px;
    font-size: 1rem;
    background-color: #5bc0de;
    border: none;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #31b0d5;
}

.mode-options {
    margin-top: 20px;
    margin-bottom: 15px;
    padding: 15px;
    border: 2px solid #ccc;
    border-radius: 8px;
    background-color: #fff;
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
}

.mode-options label {
    font-size: 1rem;
    margin: 0;
}

@media screen and (max-width: 600px) {
    h1 {
        font-size: 1.5rem;
    }

    .word-pair input {
        padding: 8px;
        font-size: 0.9rem;
    }

    button {
        font-size: 0.9rem;
        padding: 8px 16px;
    }

    .mode-options {
        align-items: center;
    }
}