* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    touch-action: manipulation;
}

#video-container {
    position: fixed;
    width: 100vw;
    height: 100vh;
    background: #000;
    overflow: hidden;
    overscroll-behavior: none;
}

#mobile-container {
    display: none;
    position: fixed;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

#fullscreen-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    -webkit-tap-highlight-color: transparent;
}

#mobile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#playBtn {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 12px 24px;
    font-size: 18px;
    border-radius: 25px;
    border: 2px solid #fff;
    background: rgba(0,0,0,0.7);
    color: white;
    cursor: pointer;
    z-index: 100;
    min-width: 120px;
    -webkit-user-select: none;
    user-select: none;
}

.scroll-tip {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: #fff;
    text-align: center;
    font-size: 14px;
    animation: float 2s infinite;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

@media (max-width: 767px) {
    #video-container {
        display: none;
    }
    #mobile-container {
        display: block;
    }
}

@media screen and (orientation: landscape) {
    #fullscreen-video {
        object-fit: contain;
        background: #000;
    }
}

@keyframes float {
    0%, 100% { transform: translate(-50%, 0); opacity: 0.8; }
    50% { transform: translate(-50%, -15px); opacity: 1; }
}