:root {
    color-scheme: dark;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #222;
    color: #f2f2f2;
}

#app {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem;
}

h1,
h2 {
    margin: 0.5rem 0;
    text-align: center;
}

#gameContainer {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1rem;
    align-items: start;
}

#gameBoard {
    border: 3px solid #ddd;
    background: #fff;
}

#hud {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

#scoreText {
    font-size: 1.8rem;
    font-weight: bold;
}

#statusText {
    font-size: 1rem;
    padding: 0.4rem;
    background: #333;
    border-radius: 6px;
}

#controlHint {
    margin: 0;
    color: #ddd;
    line-height: 1.4;
}

button {
    font-size: 0.95rem;
    padding: 0.6rem 0.8rem;
    border: 2px solid #666;
    border-radius: 8px;
    background: #444;
    color: #fff;
    cursor: pointer;
}

button:hover {
    background: #555;
}

#p2pPanel {
    margin-top: 1rem;
    border: 1px solid #555;
    border-radius: 8px;
    padding: 0.8rem;
    background: #2b2b2b;
}

.signalGrid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
}

textarea {
    width: 100%;
    min-height: 120px;
    background: #111;
    color: #eee;
    border: 1px solid #666;
    border-radius: 6px;
    padding: 0.5rem;
    resize: vertical;
    box-sizing: border-box;
}

.buttonRow {
    margin-top: 0.7rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

@media (max-width: 900px) {
    #gameContainer {
        grid-template-columns: 1fr;
    }

    .signalGrid {
        grid-template-columns: 1fr;
    }
}