:root {
    --bg: #0b0f1a;
    --glass: rgba(255, 255, 255, 0.08);
    --neon-x: #00eaff;
    --neon-o: #ff4ecd;
    --win: #00ff9d;
    --draw: #ffaa00;
}

* {
    box-sizing: border-box;
    font-family: 'Orbitron', sans-serif;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        url("data:image/svg+xml;utf8,\
        <svg xmlns='http://www.w3.org/2000/svg' width='80' height='80'>\
        <rect width='80' height='80' fill='%230b0f1a'/>\
        <circle cx='40' cy='40' r='1.5' fill='%231e294b'/>\
        </svg>"),
        var(--bg);
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
}

.app {
    background: var(--glass);
    backdrop-filter: blur(14px);
    padding: 30px 40px;
    border-radius: 18px;
    text-align: center;
    box-shadow: 0 0 40px rgba(0,0,0,0.6);
}

h1 {
    margin: 0;
    letter-spacing: 2px;
}

.divider line {
    stroke: #2b3a6a;
    stroke-width: 2;
}

#status {
    margin: 15px 0;
    font-size: 0.9rem;
    opacity: 0.85;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 90px);
    gap: 12px;
    margin: 20px auto;
}

.cell {
    width: 90px;
    height: 90px;
    background: rgba(255,255,255,0.05);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.2s ease;
}

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

.cell.X {
    color: var(--neon-x);
    text-shadow: 0 0 15px var(--neon-x);
}

.cell.O {
    color: var(--neon-o);
    text-shadow: 0 0 15px var(--neon-o);
}

.cell.win {
    animation: winPulse 0.8s infinite alternate;
}

@keyframes winPulse {
    from { box-shadow: 0 0 10px var(--win); }
    to { box-shadow: 0 0 30px var(--win); }
}

.board.draw {
    animation: drawShake 0.6s ease;
}

@keyframes drawShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

button {
    margin-top: 10px;
    padding: 10px 22px;
    background: transparent;
    border: 1px solid #4f6cff;
    border-radius: 25px;
    color: white;
    cursor: pointer;
    transition: background 0.3s ease;
}

button:hover {
    background: rgba(79,108,255,0.2);
}