/* General Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    padding: 20px;
    margin: 0;
}

main {
    max-width: 650px;
    margin: 0 auto;
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-top: 0;
}

/* Form Controls */
fieldset {
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    margin-bottom: 30px;
    background-color: #fafafa;
}

legend {
    padding: 0 10px;
    font-weight: bold;
    color: #2c3e50;
}

fieldset > div {
    margin: 15px 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

label {
    cursor: pointer;
    user-select: none;
    font-weight: 500;
}

input[type="number"] {
    padding: 8px;
    border: 1px solid #bbb;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.2s;
}

input[type="number"]:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 0 0 4px rgba(76, 175, 80, 0.3);
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #4CAF50;
}

input[type="checkbox"]:focus {
    outline: 2px solid #4CAF50;
    outline-offset: 2px;
}

/* Buttons */
button {
    width: 50px;
    height: 50px;
    font-size: 30pt;
    font-weight: bold;
    border: 2px solid #333;
    border-radius: 4px;
    background-color: white;
    color: #333;
    cursor: pointer;
    transition: all 0.2s;
}

button:hover:not(:disabled) {
    background-color: #f0f0f0;
    border-color: #2c3e50;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

button:active:not(:disabled) {
    background-color: #e0e0e0;
    transform: scale(0.98);
}

button:focus:not(:disabled) {
    outline: 2px solid #4CAF50;
    outline-offset: 2px;
}

button:disabled {
    color: #999;
    border-color: #ccc;
    background-color: #f5f5f5;
    cursor: not-allowed;
    opacity: 0.6;
}

/* New Game Button - special styling */
fieldset button {
    width: auto;
    padding: 10px 20px;
    height: auto;
    font-size: 16px;
    background-color: #4CAF50;
    color: white;
    border-color: #45a049;
    margin-top: 10px;
}

fieldset button:hover {
    background-color: #45a049;
}

fieldset button:active {
    background-color: #3d8b40;
}

/* Game Board */
section[aria-label="Game board"] {
    margin-bottom: 30px;
}

#board {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 10px;
    background-color: #e8e8e8;
    border-radius: 4px;
    justify-content: center;
    min-height: 200px;
}

#board button {
    margin: 2px;
}

#p0, #p1, #p2 {
    margin: 5px;
}

/* Status Message */
#msg {
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    color: #2c3e50;
    min-height: 30px;
    padding: 15px;
    background-color: #f0f0f0;
    border-radius: 4px;
    border-left: 4px solid #4CAF50;
}

/* Responsive Design */
@media (max-width: 480px) {
    main {
        padding: 15px;
    }

    fieldset {
        padding: 15px;
    }

    button {
        width: 45px;
        height: 45px;
        font-size: 24pt;
    }

    #board {
        gap: 2px;
        min-height: 150px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #1e1e1e;
        color: #e0e0e0;
    }

    main {
        background-color: #2d2d2d;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    }

    h1 {
        color: #e0e0e0;
    }

    fieldset {
        background-color: #3d3d3d;
        border-color: #555;
    }

    legend {
        color: #e0e0e0;
    }

    input[type="number"] {
        background-color: #2d2d2d;
        color: #e0e0e0;
        border-color: #555;
    }

    input[type="number"]:focus {
        border-color: #66bb6a;
        box-shadow: 0 0 4px rgba(102, 187, 106, 0.3);
    }

    button {
        background-color: #3d3d3d;
        color: #e0e0e0;
        border-color: #666;
    }

    button:hover:not(:disabled) {
        background-color: #4d4d4d;
        border-color: #888;
    }

    button:active:not(:disabled) {
        background-color: #5d5d5d;
    }

    button:disabled {
        color: #666;
        border-color: #444;
        background-color: #2d2d2d;
    }

    fieldset button {
        background-color: #4CAF50;
        color: white;
        border-color: #45a049;
    }

    #board {
        background-color: #3d3d3d;
    }

    #msg {
        background-color: #3d3d3d;
        color: #e0e0e0;
        border-left-color: #66bb6a;
    }
}