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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(180deg, #7dd3fc 0%, #38bdf8 100%);
    color: #0f172a;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#game-container {
    position: relative;
    width: min(900px, 90vw);
    height: min(600px, 85vh);
    background: linear-gradient(180deg, #bae6fd 0%, #38bdf8 60%, #22c55e 100%);
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.25);
    overflow: hidden;
}

#game-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.hud {
    position: absolute;
    top: 16px;
    left: 16px;
    display: flex;
    gap: 16px;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    font-weight: 600;
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.15);
}

.overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: rgba(15, 23, 42, 0.5);
    color: #f8fafc;
    text-align: center;
    padding: 20px;
}

.overlay.hidden {
    display: none;
}

.overlay h1 {
    font-size: 40px;
}

.overlay p {
    font-size: 18px;
    opacity: 0.9;
}

button {
    border: none;
    background: #f97316;
    color: #fff;
    padding: 12px 24px;
    border-radius: 999px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(249, 115, 22, 0.4);
    transition: transform 0.2s ease;
}

button:hover {
    transform: translateY(-2px);
}

.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    color: #f8fafc;
    text-decoration: none;
    background: rgba(15, 23, 42, 0.6);
    padding: 10px 16px;
    border-radius: 999px;
    font-weight: 600;
    z-index: 5;
}

@media (max-width: 700px) {
    .overlay h1 {
        font-size: 30px;
    }

    .hud {
        flex-direction: column;
        gap: 6px;
    }
}