body {
    margin: 0;
    background: #0d0614;
    color: #fff;
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    overflow: hidden;
    user-select: none;
}

#game-container {
    position: relative;
    box-shadow: 0 0 40px rgba(0, 255, 255, 0.2), 0 20px 50px rgba(0,0,0,0.8);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

canvas {
    display: block;
    background: linear-gradient(to bottom, #120722, #05020a);
}

/* UI Structure */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 800px;
    height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(8, 4, 15, 0.92);
    transition: all 0.3s ease;
    z-index: 10;
}

.hidden {
    display: none !important;
}

h1 {
    font-size: 46px;
    margin: 0 0 10px 0;
    text-transform: uppercase;
    letter-spacing: 4px;
    text-shadow: 0 0 15px #00ffff;
    color: #ffffff;
}

p {
    font-size: 15px;
    color: #a59cb0;
    margin: 0 0 35px 0;
    letter-spacing: 1px;
}

button {
    padding: 14px 40px;
    font-size: 18px;
    font-weight: bold;
    font-family: inherit;
    text-transform: uppercase;
    background: #00ffff;
    color: #05020a;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
    transition: all 0.2s ease-in-out;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px rgba(0, 255, 255, 0.7);
}

#level-select {
    display: flex;
    gap: 12px;
    margin-bottom: 30px;
}

.lvl-btn {
    padding: 10px 14px;
    font-size: 13px;
    background: #190f26;
    color: #a59cb0;
    border: 1px solid #3d285c;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: none;
}

.lvl-btn.active {
    border-color: #00ffff;
    color: #ffffff;
    background: rgba(0, 255, 255, 0.1);
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.2);
}

/* Player HUD */
#hud {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    font-size: 16px;
    letter-spacing: 1px;
    pointer-events: none;
    text-shadow: 0 2px 4px #000;
    font-weight: bold;
}

#mode-badge {
    padding: 3px 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    text-transform: uppercase;
}