body {
    font-family: system-ui, sans-serif;
    padding: 2rem;
    background: #f7f7f7;
    text-align: center;
    color: #1e1e1e;
}

h1 {
    color: #333;
    text-align: center;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.button {
    display: inline-block;
    margin: 0 0.25rem 0.5rem;
    padding: 0.75rem 1.25rem;
    background: #333;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
}

.site-nav .button {
    margin: 0;
}

.button:hover {
    background: #555;
}

.button.current {
    background: #0f766e;
}

.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

table {
    margin: 1.25rem auto;
    table-layout: fixed;
    border-collapse: collapse;
    background: #fff;
}

th {
    width: 44px;
    height: 44px;
    border: 1px solid #333;
    padding: 0;
}

#battle-grid td {
    width: 64px;
    height: 64px;
    border: 1px solid #333;
    padding: 0;
    background-size: 64px 64px;
    background-repeat: no-repeat;
    background-position: center;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

td.battleship_front {
    background-image: url("battleship_front.png");
}

td.battleship_middle {
    background-image: url("battleship_middle.png");
}

td.battleship_rear {
    background-image: url("battleship_rear.png");
}

td.battleship_1 {
    background-image: url("battleship_1.png");
}

td.battleship_1_horizontal {
    background-image: url("battleship_1_horizontal.png");
}

td.battleship_front_horizontal {
    background-image: url("battleship_front_horizontal.png");
}

td.battleship_middle_horizontal {
    background-image: url("battleship_middle_horizontal.png");
}

td.battleship_rear_horizontal {
    background-image: url("battleship_rear_horizontal.png");
}

td.ocean {
    background-image: url("battleship_ocean.png");
}

button {
    padding: 0.5rem 1rem;
    font-size: 1rem;
    cursor: pointer;
    display: block;
    margin: 1rem auto;
}

.hidden {
    display: none;
}