* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

body {
    background-color: #1a1a1a;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    color: #fff;
}

#game-container {
    position: relative;
    width: 400px;
    height: 600px;
    border: 4px solid #c8fbff;
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
    overflow: hidden;
}

canvas {
    display: block;
    background: linear-gradient(to bottom, #001e3d, #000814);
}

#ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.65);
    text-align: center;
}

h1 {
    font-size: 2rem;
    color: #c8fbff;
    text-shadow: 2px 2px #30b7ff;
    margin-bottom: 10px;
}

p {
    font-size: 1rem;
    color: #e0e0e0;
    margin-bottom: 20px;
}

.btn {
    background-color: #bff8ff;
    color: #000;
    border: none;
    padding: 12px 24px;
    font-size: 1.1rem;
    font-weight: bold;
    font-family: inherit;
    cursor: pointer;
    box-shadow: 3px 3px 0px #0099ff;
    transition: transform 0.1s;
}

.btn:active {
    transform: translate(2px, 2px);
    box-shadow: 1px 1px 0px #0099ff;
}

.btn:hover {
    background-color: #00d9ff;
    color: #ffffff;
}

.hidden {
    display: none !important;
}