:root {
    --arena-width: 800px;
    --arena-height: 600px;
    --bar-width: 8px;
    --bar-height: 20%;
    --ball-size: 20px;
    --primary-color: #333;
    --accent-color: orangered;
    --bg-color: antiquewhite;
    --text-color: #fff;
    --border-color: #666;
}

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

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: linear-gradient(135deg, #ffecd2, #fcb69f);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    text-align: center;
}

#round-container {
    display: flex;
    gap: 1rem;
    background: linear-gradient(135deg, #f76b1c, #f7a849);
    padding: 1rem;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    margin-bottom: 15px;
}

#round {
    border-radius: 5px;
    background-color: var(--bg-color);
    padding: 0.5rem;
    border: none;
    font-size: 16px;
    font-weight: bold;
    outline: none;
    transition: transform 0.2s ease-in-out;
}

#round:hover {
    transform: scale(1.05);
}

#score-board {
    display: flex;
    justify-content: space-between;
    width: var(--arena-width);
    padding: 20px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
}

#game-arena {
    width: calc(var(--arena-width) + 10px);
    height: calc(var(--arena-height) + 10px);
    background: var(--primary-color);
    position: relative;
    border: 5px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
    overflow: hidden;
}

.bar {
    width: var(--bar-width);
    height: var(--bar-height);
    background: linear-gradient(135deg, #888, #555);
    border-radius: 5px;
    position: absolute;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: top 0.1s linear;
}

#start-btn {
    background-color: var(--accent-color);
    color: var(--text-color);
    padding: 15px 30px;
    font-size: 18px;
    margin-top: 10px;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s ease, transform 0.2s ease-in-out;
}

#start-btn:hover {
    background-color: darkorange;
    transform: scale(1.05);
}

.ball {
    width: var(--ball-size);
    height: var(--ball-size);
    background: radial-gradient(circle, #fff, #ddd);
    border-radius: 50%;
    position: absolute;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transition: top 0.1s linear, left 0.1s linear;
}