:root {
    --bg-color: #f4f6f8;
    --text-color: #333;
    --board-border: #2c3e50;
    --square-light: #ecf0f1;
    --square-dark: #95a5a6;
    --accent-color: #3498db;
    --btn-hover: #2980b9;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

h1 {
    font-weight: 300;
    letter-spacing: -0.5px;
    margin-bottom: 2rem;
    color: var(--board-border);
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.chessboard {
    display: grid;
    grid-template-columns: repeat(8, 50px);
    grid-template-rows: repeat(8, 50px);
    border: 5px solid var(--board-border);
    user-select: none;
}

.square {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.square.light {
    background-color: var(--square-light);
}

.square.dark {
    background-color: var(--square-dark);
}

.queen {
    color: var(--board-border);
    text-shadow: 0 2px 2px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: transform 0.2s ease;
}

.queen:hover {
    transform: scale(1.1);
}

.controls {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

button:hover {
    background-color: var(--btn-hover);
}

button.secondary {
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

button.secondary:hover {
    background-color: rgba(52, 152, 219, 0.1);
}

@media (max-width: 600px) {
    .chessboard {
        grid-template-columns: repeat(8, 1fr);
        grid-template-rows: repeat(8, 1fr);
        width: 100%;
        max-width: 400px;
        height: auto;
        aspect-ratio: 1/1;
    }

    .square {
        width: 100%;
        height: 100%;
        font-size: 1.5rem;
    }
}