:root {
    --rows: 6;
    --cols: 7;
    --cell-size: 60px;
    --player1-color: #e74c3c; /* Red */
    --player2-color: #f1c40f; /* Yellow */
    --board-color: #3498db; /* Blue */
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f0f4f8;
}

#game-container {
    text-align: center;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

h1 {
    color: var(--board-color);
    margin-bottom: 10px;
}

#status-area {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #ecf0f1;
    border-radius: 5px;
}

#turn-indicator {
    font-size: 1.2em;
    font-weight: bold;
    margin: 0;
}

#reset-button {
    padding: 8px 15px;
    background-color: #2ecc71; /* Green */
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
}

#reset-button:hover {
    background-color: #27ae60;
}

/* --- Board Styling --- */
#board {
    display: grid;
    grid-template-rows: repeat(var(--rows), var(--cell-size));
    grid-template-columns: repeat(var(--cols), var(--cell-size));
    background-color: var(--board-color);
    border-radius: 10px;
    padding: 5px;
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 5px;
    box-sizing: border-box;
}

.cell-disc {
    width: calc(var(--cell-size) - 10px);
    height: calc(var(--cell-size) - 10px);
    border-radius: 50%;
    background-color: white; /* The hole color */
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.3);
    transition: background-color 0.1s ease;
}

/* --- Disc Colors --- */
.player1 {
    background-color: var(--player1-color);
}

.player2 {
    background-color: var(--player2-color);
}

/* --- Hover Effect for Dropping --- */
.cell[data-column]:hover .cell-disc {
    /* Temporarily show a faded disc to indicate drop target */
    opacity: 0.5;
    background-color: transparent; /* Reset to white base */
}

/* Player 1 hover preview */
#board:has(.cell[data-column]:hover):not(.game-over) .cell[data-column]:hover .cell-disc {
    background-color: var(--player1-color);
}

/* Player 2 hover preview (overridden by JS on turn change) */
.player2-turn #board:has(.cell[data-column]:hover):not(.game-over) .cell[data-column]:hover .cell-disc {
    background-color: var(--player2-color);
}

/* Game Over state */
.game-over .cell[data-column]:hover .cell-disc {
    opacity: 1; /* Disable hover effect when game is over */
    cursor: default;
}

/* Win animation highlight */
.winning-cell .cell-disc {
    box-shadow: 0 0 15px 5px #fff;
    animation: flash 0.5s infinite alternate;
}

@keyframes flash {
    from { transform: scale(1.0); }
    to { transform: scale(1.1); }
}