:root {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --accent-good: #28a745;
    --accent-bad: #dc3545;
    --accent-good-hover: #218838;
    --accent-bad-hover: #c82333;
    --shadow: 0 10px 30px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.app-container {
    text-align: center;
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    height: 80vh;
}

.syllable {
    font-family: "Times New Roman", Times, serif;
    font-size: 10rem;
    font-weight: bold;
    min-height: 12rem;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.2s ease, opacity 0.2s ease;
    user-select: none;
}

.syllable.pop {
    transform: scale(1.1);
}

.controls {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.control-btn {
    padding: 1.5rem 3rem;
    font-size: 1.5rem;
    font-weight: bold;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: transform 0.1s ease, background-color 0.2s ease, box-shadow 0.2s ease;
    color: white;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    min-width: 160px;
}

.control-btn:active {
    transform: scale(0.95);
}

.control-btn.bad {
    background-color: var(--accent-bad);
}

.control-btn.bad:hover {
    background-color: var(--accent-bad-hover);
    box-shadow: 0 6px 12px rgba(220, 53, 69, 0.3);
}

.control-btn.good {
    background-color: var(--accent-good);
}

.control-btn.good:hover {
    background-color: var(--accent-good-hover);
    box-shadow: 0 6px 12px rgba(40, 167, 69, 0.3);
}

@media (max-width: 480px) {
    .syllable {
        font-size: 6rem;
    }
    .controls {
        flex-direction: column-reverse;
        gap: 1rem;
    }
    .control-btn {
        width: 100%;
    }
}