/* Variables for easy customization */
:root {
    --square-size: 55px; /* Adjust this to make the board larger/smaller */
    --board-background-light: #f0d9b5;
    --board-background-dark: #b58863;
    --selected-square-color: #a3ff00;
    --highlight-move-color: rgba(0, 255, 0, 0.5);
    --check-king-color: rgba(255, 0, 0, 0.5);
    --font-color-light: #333;
    --font-color-dark: #eee;
    --button-bg: #ccc;
    --button-hover-bg: #bbb;
    --button-selected-bg: #808080;
    --panel-bg: #e0e0e0;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* Align to the top for better content visibility */
    min-height: 100vh;
    margin: 0;
    background-color: #f4f4f4;
    padding: 20px; /* Add some padding around the content */
    box-sizing: border-box; /* Include padding in element's total width and height */
}

.container {
    background-color: #fff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 100%;
    max-width: 900px; /* Adjust max-width for better layout on wider screens */
    display: flex;
    flex-direction: column; /* Arrange content vertically */
    gap: 20px; /* Space between sections */
}

h1 {
    color: var(--font-color-light);
    margin-bottom: 20px;
}

/* Game Controls (Initial Menu) */
#game-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

#game-controls p {
    font-weight: bold;
    margin-bottom: 5px;
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap; /* Allow buttons to wrap on smaller screens */
}

button {
    padding: 10px 15px;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

button:hover:not(:disabled) {
    background-color: var(--button-hover-bg);
}

button.selected {
    background-color: var(--button-selected-bg);
    color: var(--font-color-dark);
}

button:disabled {
    background-color: #e0e0e0;
    cursor: not-allowed;
    color: #a0a0a0;
}

/* Chessboard Container - Enables Scrolling */
#chessboard-container {
    overflow: auto; /* Enables scrollbars when content overflows */
    -webkit-overflow-scrolling: touch; /* Improves scrolling performance on iOS */
    max-width: 100%; /* Ensures it doesn't exceed parent width */
    /* If you want a fixed height for the container to force vertical scroll, uncomment below */
    /* max-height: 480px; */ /* Example: adjust as needed to create scroll */
    margin: 0 auto; /* Center the container if it's smaller than max-width */
    border: 1px solid #ccc; /* Optional: border to see the container */
}


#chessboard {
    display: grid;
    grid-template-columns: repeat(8, var(--square-size));
    grid-template-rows: repeat(8, var(--square-size));
    width: calc(var(--square-size) * 8); /* Explicitly set size to enable overflow */
    height: calc(var(--square-size) * 8); /* Explicitly set size to enable overflow */
    margin: 0 auto;
    border: 3px solid var(--board-background-dark);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    /* No overflow:hidden here as the container handles it */
}

/* Flipped board for Black's POV */
#chessboard.flipped {
    transform: rotate(180deg);
}

#chessboard.flipped .square {
    transform: rotate(180deg); /* Flip pieces back to normal */
}


.square {
    width: var(--square-size);
    height: var(--square-size);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: calc(var(--square-size) * 0.7); /* Piece size relative to square */
    cursor: pointer;
    user-select: none; /* Prevent text selection */
}

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

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

.white-piece {
    color: #fff; /* White pieces can be light colored */
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5); /* Optional: for better contrast */
}

.black-piece {
    color: #000; /* Black pieces can be dark colored */
    text-shadow: 1px 1px 2px rgba(255,255,255,0.5); /* Optional: for better contrast */
}

/* Highlight for selected piece */
.selected-piece {
    background-color: var(--selected-square-color);
}

/* Highlight for legal moves */
.highlight-move {
    background-color: var(--highlight-move-color);
    border: 2px solid var(--highlight-move-color); /* Add border to make it more visible */
    box-sizing: border-box; /* Ensure border doesn't push square size */
}

/* Highlight for king in check */
.in-check-king {
    background-color: var(--check-king-color);
}


/* Game Info Display */
#game-info {
    margin-top: 15px;
    background-color: var(--panel-bg);
    padding: 15px;
    border-radius: 8px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

#turn-display,
#fen-display,
#game-status {
    font-weight: bold;
    margin-bottom: 5px;
}

/* Move History Panel */
#move-history-panel {
    background-color: var(--panel-bg);
    padding: 15px;
    border-radius: 8px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    text-align: left; /* Align text within the panel */
    max-height: 200px; /* Limit height to enable scrolling for long games */
    overflow-y: auto; /* Enable vertical scrolling */
}

#move-history-panel h2 {
    margin-top: 0;
    margin-bottom: 10px;
    color: var(--font-color-light);
    font-size: 1.1em;
}

#move-list {
    list-style: none; /* Remove default bullet points */
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap; /* Allow moves to wrap within the list */
    gap: 5px 10px; /* Gap between rows and columns */
}

.move-item {
    white-space: nowrap; /* Keep move pairs on one line */
    cursor: pointer;
    padding: 3px 5px;
    border-radius: 3px;
    transition: background-color 0.2s ease;
}

.move-item:hover {
    background-color: #d0d0d0;
}

.move-item.current-move {
    background-color: var(--selected-square-color);
    font-weight: bold;
}

.move-number {
    margin-right: 5px;
    color: #555;
}

.move-text {
    font-weight: normal;
    color: var(--font-color-light);
}

/* Game Actions (Resign Button) */
#game-actions {
    display: flex;
    justify-content: center;
    margin-top: 15px;
}

/* Post-Game Options */
#post-game-options {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
}


/* Promotion GUI (Modal) */
#promotion-gui {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1000; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgba(0,0,0,0.7); /* Black w/ opacity */
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: #fefefe;
    padding: 20px;
    border: 1px solid #888;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    max-width: 90%;
}

#promotion-options {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 15px;
}

.promotion-option {
    font-size: calc(var(--square-size) * 0.8); /* Larger piece for selection */
    cursor: pointer;
    border: 2px solid #ccc;
    padding: 5px 10px;
    border-radius: 5px;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.promotion-option:hover {
    background-color: #eee;
    border-color: #888;
}

/* Console Log Display */
.logs {
    background-color: #333;
    color: #eee;
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    text-align: left;
    max-height: 250px;
    overflow-y: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85em;
    position: relative; /* For clear button positioning */
}

.logs h2 {
    margin-top: 0;
    margin-bottom: 10px;
    color: #fff;
    font-size: 1em;
}

.logs p {
    margin: 2px 0;
    line-height: 1.2;
    word-wrap: break-word; /* Ensure long lines wrap */
}

.logs .log { color: #eee; }
.logs .warn { color: #ffeb3b; } /* Yellow for warnings */
.logs .error { color: #ff1744; } /* Red for errors */

#clear-logs {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 5px 10px;
    font-size: 0.8em;
    background-color: #555;
    color: white;
}
#clear-logs:hover {
    background-color: #777;
}


/* Responsive Adjustments */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    :root {
        --square-size: 45px; /* Smaller squares for smaller screens */
    }

    h1 {
        font-size: 1.8em;
    }

    button {
        padding: 8px 12px;
        font-size: 0.9em;
    }

    #game-info {
        padding: 10px;
        font-size: 0.9em;
    }

    #promotion-options {
        flex-direction: column; /* Stack promotion options vertically on small screens */
        gap: 10px;
    }
}

@media (max-width: 480px) {
    :root {
        --square-size: 40px; /* Even smaller squares for very small screens */
    }

    h1 {
        font-size: 1.5em;
    }

    .button-group {
        flex-direction: column; /* Stack buttons vertically */
        gap: 8px;
    }

    button {
        width: 100%; /* Full width buttons */
    }

    .logs {
        font-size: 0.75em;
    }
}