:root {
    --primary-color: #4a90e2;
    --secondary-color: #50e3c2;
    --background-color: #f4f7f6;
    --text-color: #333;
    --white: #fff;
    --correct-color: #28a745;
    --incorrect-color: #dc3545;
    --border-radius: 12px;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

#game-container {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    width: 100%;
    max-width: 500px;
    text-align: center;
}

header {
    margin-bottom: 2rem;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

#score-board {
    font-size: 1.2rem;
    font-weight: 600;
}

#word-container {
    margin-bottom: 1.5rem;
}

#instruction-text {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

#current-word {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--primary-color);
    padding: 0.5rem;
    background-color: #eef5ff;
    border-radius: 8px;
}

#syllable-input-area {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

#syllable-input {
    flex-grow: 1;
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1.1rem;
    text-align: center;
    transition: border-color 0.3s;
}

#syllable-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

button {
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    color: var(--white);
}

button:hover {
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

#check-syllables-btn, #next-word-btn {
    background-color: var(--primary-color);
}

#check-syllables-btn:hover, #next-word-btn:hover {
    background-color: #357abd;
}

#classification-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.classification-btn {
    background-color: var(--secondary-color);
    padding: 1rem;
}

.classification-btn:hover {
    background-color: #48c9b0;
}

.classification-btn.correct {
    background-color: var(--correct-color);
}

.classification-btn.incorrect {
    background-color: var(--incorrect-color);
}

#feedback-area {
    margin-top: 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    min-height: 25px;
}

.feedback-correct {
    color: var(--correct-color);
}

.feedback-incorrect {
    color: var(--incorrect-color);
}

.hidden {
    display: none;
}

@media (max-width: 480px) {
    body {
        padding: 0.5rem;
    }
    #game-container {
        padding: 1.5rem;
    }
    h1 {
        font-size: 1.8rem;
    }
    #current-word {
        font-size: 2rem;
    }
    #syllable-input-area {
        flex-direction: column;
    }
    button {
        width: 100%;
    }
}