body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364); /* ✅ your previous elegant colors */
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
}

/* 🧊 Glass container */
.container {
    text-align: center;
    padding: 30px;
    border-radius: 20px;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.06);
    box-shadow: 0 8px 30px rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.15);
}

/* 🎮 Title */
h1 {
    margin-bottom: 10px;
    letter-spacing: 1px;
}

/* 🏆 Scoreboard */
.scoreboard {
    display: flex;
    justify-content: space-between;
    margin: 10px 0 20px;
    font-size: 1.1rem;
}

/* 🎯 Mode buttons */
.mode-select button {
    margin: 5px;
    padding: 10px 15px;
    border: none;
    border-radius: 10px;
    background: #00c6ff;
    color: black;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.mode-select button:hover {
    transform: scale(1.05);
    background: #00f2fe;
}

/* 🎲 Board */
.board {
    display: grid;
    grid-template-columns: repeat(3, 110px);
    gap: 12px;
    margin: 20px auto;
}

/* 🧊 Cells */
.cell {
    width: 110px;
    height: 110px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    border-radius: 15px;
    cursor: pointer;

    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);

    transition: 0.3s;
}

/* ✨ Hover */
.cell:hover {
    transform: scale(1.07);
    background: rgba(255,255,255,0.15);
}

/* 🏆 Winning cells */
.cell.win {
    background: #00ffcc;
    color: black;
    animation: winPop 0.4s ease;
}

/* 🎯 Win animation */
@keyframes winPop {
    0% { transform: scale(0.8); }
    100% { transform: scale(1.1); }
}

/* 🔁 Restart */
.restart {
    margin-top: 10px;
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    background: #ff416c;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.restart:hover {
    transform: scale(1.05);
}

/* 📱 Mobile */
@media (max-width: 500px) {
    .board {
        grid-template-columns: repeat(3, 90px);
    }

    .cell {
        width: 90px;
        height: 90px;
        font-size: 2rem;
    }
}