:root {
    --background: #0f172a;
    --panel: #111827;
    --accent: #22d3ee;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --danger: #f87171;
    --success: #34d399;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    width: min(1200px, 90vw);
}

.sidebar {
    background-color: var(--panel);
    padding: 2rem;
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.45);
}

.sidebar h1 {
    font-size: 1.75rem;
}

.sidebar p {
    color: var(--text-secondary);
    line-height: 1.4;
}

.instructions ul {
    list-style: none;
    display: grid;
    gap: 0.5rem;
}

.instructions__group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.instructions__group:last-of-type {
    margin-bottom: 0;
}

.key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.25rem 0.75rem;
    border-radius: 0.5rem;
    background-color: rgba(148, 163, 184, 0.1);
    border: 1px solid rgba(148, 163, 184, 0.4);
    margin-right: 0.25rem;
}

.status {
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    text-align: center;
    font-weight: 600;
}

.status--disconnected {
    background-color: rgba(248, 113, 113, 0.15);
    color: var(--danger);
}

.status--connected {
    background-color: rgba(52, 211, 153, 0.15);
    color: var(--success);
}

.arena-container {
    background-color: rgba(15, 23, 42, 0.65);
    padding: 1rem;
    border-radius: 1rem;
    box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
}

#game-canvas {
    border-radius: 0.75rem;
    width: 100%;
    height: auto;
    background: radial-gradient(circle at center, rgba(34, 211, 238, 0.15), rgba(15, 23, 42, 0.8));
    border: 2px solid rgba(34, 211, 238, 0.4);
}

@media (max-width: 960px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .arena-container {
        order: -1;
    }
}