:root {
    --bg-color: #f8fafc;
    --text-primary: #0f172a;
    --accent-color: #3b82f6; /* Blue board */
    --border-color: rgba(0, 0, 0, 0.1);
    
    --p1-color: #ef4444; /* Red */
    --p2-color: #eab308; /* Yellow */
    --empty-color: #ffffff;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background: #ffffff;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    position: relative;
}

header {
    text-align: center;
    width: 100%;
}

.back-btn {
    display: inline-block;
    color: var(--text-primary);
    text-decoration: none;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    opacity: 0.7;
    transition: opacity 0.3s;
    width: 100%;
    text-align: left;
    font-weight: 500;
}

.back-btn:hover {
    opacity: 1;
    color: var(--accent-color);
}

h1 {
    font-weight: 800;
    letter-spacing: 2px;
}

h1 span {
    color: var(--accent-color);
}

.status-board {
    display: flex;
    justify-content: space-between;
    width: 100%;
    align-items: center;
    padding: 0 1rem;
}

#turnText {
    font-size: 1.2rem;
    font-weight: 600;
}

#turnText.p1 { color: var(--p1-color); }
#turnText.p2 { color: var(--p2-color); }

button {
    padding: 0.5rem 1.5rem;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    background: var(--text-primary);
    color: #ffffff;
}

.board {
    display: grid;
    grid-template-columns: repeat(7, 50px);
    grid-template-rows: repeat(6, 50px);
    gap: 10px;
    background-color: var(--accent-color);
    padding: 15px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.cell {
    width: 50px;
    height: 50px;
    background-color: var(--empty-color);
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 3px 6px rgba(0,0,0,0.1);
}

.cell:hover {
    opacity: 0.8;
}

.cell.p1 {
    background-color: var(--p1-color);
    box-shadow: inset 0 -3px 6px rgba(0,0,0,0.2);
}

.cell.p2 {
    background-color: var(--p2-color);
    box-shadow: inset 0 -3px 6px rgba(0,0,0,0.2);
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    border-radius: 20px;
    z-index: 10;
}

.overlay.hidden {
    display: none;
}

.overlay h2 {
    font-size: 2.5rem;
}

.overlay h2.p1 { color: var(--p1-color); }
.overlay h2.p2 { color: var(--p2-color); }

@media (max-width: 500px) {
    .board {
        grid-template-columns: repeat(7, 40px);
        grid-template-rows: repeat(6, 40px);
        gap: 5px;
        padding: 10px;
    }
    .cell {
        width: 40px;
        height: 40px;
    }
}