body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: #050510;
    font-family: 'Inter', sans-serif;
}

#gameCanvas {
    display: block;
}

#introScreen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, #1a1a2e 0%, #050510 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    color: white;
}

#introScreen.hidden {
    display: none;
}

#introContent {
    background: rgba(0, 0, 0, 0.6);
    padding: 40px 60px;
    border-radius: 20px;
    border: 2px solid #00ffff;
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.2);
    text-align: center;
    max-width: 500px;
}

#introContent h1 {
    font-size: 48px;
    margin-top: 0;
    margin-bottom: 20px;
    color: #ff00ff;
    text-shadow: 0 0 10px #ff00ff;
}

#introContent p {
    font-size: 18px;
    line-height: 1.5;
    margin-bottom: 30px;
}

.controls-hint {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 40px;
}

.controls-hint p {
    margin: 5px 0;
    font-size: 16px;
}

#startBtn {
    background: transparent;
    color: #00ffff;
    font-family: 'Inter', sans-serif;
    font-size: 24px;
    font-weight: bold;
    padding: 15px 40px;
    border: 2px solid #00ffff;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.4);
}

#startBtn:hover {
    background: #00ffff;
    color: #050510;
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.8);
    transform: scale(1.05);
}