:root {
    --squarePlayedColor: #97c9d8;
}

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    gap: 1rem;
    font-family: 'Helvetica Neue', sans-serif;
    background-color: #f4f4f9;
    text-transform: uppercase;
}

h1 {
    font-family: 'Georgia', serif;
    font-size: 2.5rem;
    color: #333;
    text-align: center;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
    line-height: 1.4;
    text-transform: capitalize;
    font-weight: bold;
}

.board {
    background-color: transparent;
    border-radius: 10px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    gap: .5rem;
}

.square {
    background-color: #bfd9e2;
    padding: 3rem;
    box-shadow: 1px 1px 10px rgba(0, 0, 0, .1);
}

.cross {
    background-image: url(../images/x.png);
    background-position: center;
    background-size: contain;
}

.crossHover {
    background-image: url(../images/x.png);
    background-color: #a5ccd8;
    opacity: .5;
    background-position: center;
    background-size: contain;
}

.circle {
    background-image: url(../images/circle.png);
    background-position: center;
    background-size: contain;
}

.circleHover {
    background-image: url(../images/circle.png);
    background-color: var(--squarePlayedColor);
    opacity: .5;
    background-position: center;
    background-size: contain;
}

.square.cross,
.square.circle {
    background-color: var(--squarePlayedColor);
}

.square.cross.crossHover,
.square.circle.circleHover {
    opacity: 1;
}

.hide {
    display: none;
}

.victory {
    font-size: 1.5rem;
    color: #a52a2a;
    font-weight: bold;
    text-align: center;
}

.btnRestart {
    background-color: #5f9ea0;
    border-radius: 10px;
    color: white;
    font-size: 1rem;
    padding: 1rem 1.2rem;
    text-align: center;
    text-decoration: none;
    transform: scale(1);
}

.btnRestart:hover {
    background-color: color-mix(in srgb, #5f9ea0, #000 20%);
}

.btnRestart:active {
    transform: scale(0.95);
}