/* CSS: 디자인 및 레이아웃 */
body {
    background: #202028;
    color: #fff;
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
}
/* 게임 컨테이너: 상대 위치 기준점 */
.game-container {
    position: relative;
    border: 2px solid #fff;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}
canvas {
    display: block;
    background-color: #000;
}
/* UI 오버레이 (시작/종료 화면) */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
}
.hidden {
    display: none !important;
}
h1 { margin-bottom: 20px; font-size: 40px; text-transform: uppercase; color: #ff0055; text-shadow: 2px 2px #fff; }
p { font-size: 20px; margin-bottom: 30px; }
button {
    padding: 15px 30px;
    font-size: 18px;
    cursor: pointer;
    background: #fff;
    border: none;
    color: #202028;
    font-weight: bold;
    transition: 0.2s;
}
button:hover { background: #ff0055; color: #fff; }
.score-board {
    position: absolute;
    top: 10px;
    right: 10px;
    text-align: right;
    pointer-events: none;
}