body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f2f5;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.container {
    background-color: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 600px;
    text-align: center;
}

h1 {
    color: #1a73e8;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

select, input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 1rem;
    box-sizing: border-box;
}

button {
    background-color: #1a73e8;
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 6px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s;
    width: 100%;
}

button:hover {
    background-color: #1557b0;
}

#display-screen {
    margin-top: 1rem;
}

#sentence-box {
    background-color: #e8f0fe;
    padding: 2.5rem;
    border-radius: 8px;
    border-left: 6px solid #1a73e8;
    margin-bottom: 1.5rem;
    min-height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#sentence-text {
    font-size: 2rem;
    font-weight: bold;
    color: #202124;
    line-height: 1.4;
    margin: 0;
}

.hidden {
    display: none;
}

#back-btn {
    background-color: #5f6368;
}

#back-btn:hover {
    background-color: #3c4043;
}