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

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #1a1a2e;
    color: #eee;
}

.container {
    text-align: center;
}

h1 {
    margin-bottom: 20px;
    color: #16c79a;
}

#status {
    font-size: 24px;
    margin-bottom: 20px;
    min-height: 30px;
}

#super-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    background: #0f3460;
    padding: 10px;
    border-radius: 10px;
    margin: 0 auto 20px;
    width: fit-content;
}

.mini-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3px;
    background: #16213e;
    padding: 5px;
    border-radius: 5px;
    position: relative;
}

.cell {
    width: 50px;
    height: 50px;
    background: #0f3460;
    border: none;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    color: #eee;
    border-radius: 3px;
    transition: background 0.2s;
}

.cell:hover:not(:disabled) {
    background: #1a4d7a;
}

.cell:disabled {
    cursor: not-allowed;
}

.mini-board.won {
    pointer-events: none;
}

.mini-board.won .cell {
    visibility: hidden;
}

.mini-board.won::after {
    content: attr(data-winner);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 80px;
    font-weight: bold;
    color: #16c79a;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

#reset {
    padding: 12px 30px;
    font-size: 18px;
    background: #16c79a;
    color: #1a1a2e;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.2s;
}

#reset:hover {
    background: #19e6b3;
}

.winner-x {
    color: #ff6b6b;
}

.winner-o {
    color: #4ecdc4;
}