body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-image: url('cyberpunk_bg.jpg');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-color: #000000;
    color: #e0e0e0;
    font-family: 'Press Start 2P', cursive, monospace;
    overflow: hidden;
}

#initial-screen, #loader {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
}

#mysterious-button {
    width: 100px;
    height: 100px;
    background-color: rgba(0, 200, 255, 0.1);
    border: 3px solid #00cfff;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 20px #00cfff, 0 0 40px #00cfff, inset 0 0 15px #00cfff;
    animation: pulse 2s infinite;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    
    /* --- 核心修改在这里 --- */
    color: #00cfff;
    font-size: 24px; /* 稍微调整字体大小以适应英文单词 */
    font-weight: bold;
    text-shadow: 0 0 10px #00cfff;
    letter-spacing: 1px; /* 稍微调整字间距 */
    text-transform: uppercase; /* 让 'Start' 自动变为 'START'，更有感觉 */
}

#mysterious-button:hover {
    transform: scale(1.15);
    box-shadow: 0 0 35px #00ffff, 0 0 70px #00ffff, inset 0 0 20px #00ffff;
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.7; }
    50% { transform: scale(1); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.7; }
}

.spinner {
    border: 8px solid rgba(255, 255, 255, 0.2);
    border-top: 8px solid #00cfff;
    border-radius: 50%;
    width: 70px;
    height: 70px;
    animation: spin 1.5s linear infinite;
    box-shadow: 0 0 15px #00cfff;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#video-container {
    width: 100vw;
    height: 100vh;
}

#rickroll-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hidden {
    display: none !important;
}