:root {
    --background-color: #f9f9f9;
    --text-color: #333;
    --cell-bg-color: #f0f0f0;
    --cell-hover-bg-color: #e6e6e6;
    --cell-taken-bg-color: #d4d4d4;
    --button-bg-color: #7c44aa;
    --button-hover-bg-color: #562a72;
    --win-bg-color: white;
    --win-border-color: #ccc;
    --win-button-bg-color: #28a745;
    --win-button-hover-bg-color: #218838;
    --dark-mode-toggle-bg-color: #36314800;
    --dark-mode-toggle-icon-color: #402ad2;

    --reset-button-text-color: #ffffff;
    --reset-button-hover-bg-color: #c82333;
    
}

/* Dark mode overrides */
.dark-mode {
    --background-color: #121212;
    --text-color: #ffffff;
    --cell-bg-color: #1e1e1e;
    --cell-hover-bg-color: #333333;
    --cell-taken-bg-color: #555555;
    --button-bg-color: #8d4cbe;
    --button-hover-bg-color: #4d2266;
    --win-bg-color: #1e1e1e;
    --win-border-color: #444444;
    --win-button-bg-color: #198754;
    --win-button-hover-bg-color: #14532d;
    --dark-mode-toggle-bg-color: #343a4000;
    --dark-mode-toggle-icon-color: #ceb1ff;

    --reset-button-bg-color: #dc3545;
    --reset-button-hover-bg-color: #c82333;
    --reset-button-text-color: #f4eeff;
    
}

/* General Styles */
body {
    font-family: 'Roboto', sans-serif;
    text-align: center;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

/* Board Styles */
.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr); /* Automatically divide space into 3 equal columns */
    grid-template-rows: repeat(3, 1fr); /* Automatically divide space into 3 equal rows */
    gap: 1vw; /* Gap between cells based on viewport width */
    margin: 20px auto;
    width: 90vw; /* Board width is 90% of the viewport width */
    max-width: 500px; /* Maximum size for the board */
    aspect-ratio: 1 / 1; /* Maintain a square shape */
}

.cell {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--cell-bg-color);
    border: 2px solid var(--text-color);
    border-radius: 10%;
    font-size: 5rem;
    font-weight: bold;
    color: var(--text-color);
    cursor: pointer;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    user-select: none;
}

.cell:hover {
    background-color: var(--cell-hover-bg-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.cell.taken {
    background-color: var(--cell-taken-bg-color);
    cursor: not-allowed;
}

/* Reset Button */
.reset-btn {
    margin: 20px 0;
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: 5px;
    background-color: var(--button-bg-color);
    color: var(--reset-button-text-color);
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.reset-btn:hover {
    background-color: var(--button-hover-bg-color);
    transform: scale(1.3);
}

.reset-btn:active {
    transform: scale(1);
}

/*  Dark Mode Toggle */
.toggle-dark-mode {
    position: fixed;
    bottom: 20px;
    left: 20px;
    margin: 20px 0;
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: 5px;
    background-color: var(--dark-mode-toggle-bg-color);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.toggle-dark-mode:hover {
    background-color: #00000000;
    transform: scale(1.5);
}

.icon {
    fill: var(--dark-mode-toggle-icon-color); /* Default color */
    transition: fill 0.3s ease; 
}

.toggle-dark-mode:hover .icon {
    fill: var(--dark-mode-toggle-icon-color); /* Default color */
}

/* Win Message */
#win-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--win-bg-color);
    border: 2px solid var(--win-border-color);
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    padding: 20px 40px;
    text-align: center;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#win-message p {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

#win-message.hidden {
    display: none;
}

#win-message button {
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: 5px;
    background-color: var(--win-button-bg-color);
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

#win-message button:hover {
    background-color: var(--win-button-hover-bg-color);
    transform: scale(1.05);
}

#win-message button:active {
    transform: scale(1);
}

/* Add this somewhere in your CSS (e.g. at the bottom) */
.flash-red {
    animation: flashRed 0.4s ease forwards;
}

@keyframes flashRed {
    0% {
        background-color: rgba(255, 0, 0, 0.539);
    }
    100% {
        background-color: var(--cell-bg-color);
    }
}