* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--fg);
    min-height: 100vh;
}

.container {
    width: fit-content;
    max-width: 95vw;
    margin: 0 auto;
    padding: 24px 20px 40px;
}

.container h2 {
    text-align: center;
    color: var(--heading);
    margin-bottom: 20px;
    font-size: 2.5em;
    font-weight: 600;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.game-mode {
    display: flex;
    gap: 20px;
}

.game-mode label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-size: 1em;
    color: var(--fg-muted);
}

.game-mode input[type="radio"] {
    cursor: pointer;
}

.buttons {
    display: flex;
    gap: 10px;
}

button {
    background: var(--accent);
    color: var(--on-accent);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
}

button:hover {
    background: var(--accent-strong);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(75, 101, 132, 0.3);
}

button:active {
    transform: translateY(0);
}

.game-info {
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.score {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 10px;
}

.player-score {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2em;
    font-weight: 600;
    color: var(--fg);
}

#currentPlayer {
    text-align: center;
    font-size: 1.1em;
    font-weight: 600;
    color: var(--accent-strong);
    margin-bottom: 5px;
}

#gameStatus {
    text-align: center;
    font-size: 1.1em;
    font-weight: 600;
    color: #e74c3c;
    min-height: 1.5em;
}

.board-container {
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: auto;
    max-height: 70vh;
    padding: 10px;
}

#board {
    display: grid;
    gap: 2px;
    background: #34495e;
    padding: 2px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cell {
    width: 60px;
    height: 60px;
    background: #27ae60;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    position: relative;
    transition: background-color 0.2s;
}

.cell:hover {
    background: #2ecc71;
}

.cell.valid-move {
    background: #3498db;
}

.cell.valid-move:hover {
    background: #5dade2;
}

.coord {
    display: none;
    visibility: hidden;
    position: absolute;
    font-size: 8px;
    color: rgba(255, 255, 255, 0.3);
    top: 2px;
    left: 2px;
    pointer-events: none;
}

.disc {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s;
    animation: placeDisc 0.3s ease-out;
}

@keyframes placeDisc {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

.disc.black {
    background: radial-gradient(circle at 30% 30%, #555, #000);
}

.disc.white {
    background: radial-gradient(circle at 30% 30%, #fff, #ddd);
}

/* Responsive design */
@media (max-width: 768px) {
    .container h2 {
        font-size: 2em;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .game-mode {
        justify-content: center;
    }

    .buttons {
        justify-content: center;
    }

    .cell {
        width: 50px;
        height: 50px;
    }

    .disc {
        width: 40px;
        height: 40px;
    }

    #board {
        grid-template-columns: repeat(auto-fit, 50px) !important;
    }
}