.video-container .mask {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 99;
    top: 0;
    left: 0;
}

/* 登录/注册页：媒体加载完成前全屏加载层（透明，仅轻量指示） */
.media-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: transparent;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}
.media-loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}
.media-loader .loader-spinner {
    width: 32px;
    height: 32px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-top-color: rgba(0, 0, 0, 0.35);
    border-radius: 50%;
    animation: media-loader-spin 0.75s linear infinite;
}
.media-loader .loader-text {
    margin-top: 12px;
    color: rgba(0, 0, 0, 0.4);
    font-size: 13px;
    letter-spacing: 0.05em;
}
.media-loader .loader-dots::after {
    content: '';
    animation: media-loader-dots 1.2s steps(4, end) infinite;
}
@keyframes media-loader-spin {
    to { transform: rotate(360deg); }
}
@keyframes media-loader-dots {
    0%, 20% { content: ''; }
    40% { content: '.'; }
    60% { content: '..'; }
    80%, 100% { content: '...'; }
}
.page-content-reveal {
    opacity: 0;
    transform: scale(0.98);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.page-content-reveal.ready {
    opacity: 1;
    transform: scale(1);
}

.channel-list {
    overflow-y: scroll;
    scrollbar-width: none;
}

#more,
.chat-header .nav {
    display: none;
}

.channel-item::after {
    display: none;
}

.channels {
    padding: 6px;
}

.channel-list {
    padding: 6px;
}

@media screen and (orientation: portrait) {

    .video-container,
    .image-container {
        display: none;
    }

    .login-box {
        border-radius: 20px;
    }

    .sidebar {
        display: none !important;
    }

    .chat-header {
        justify-content: space-between;
    }

    #more {
        display: block;
        cursor: pointer;
    }

    .chat-header .nav {
        position: absolute;
        top: 0;
        left: 0;
        width: 100dvw;
        height: 100dvh;
        background-color: rgba(38, 36, 36, 0.432);
        display: flex;
        z-index: 99;
    }

    .chat-header .nav[hidden] {
        display: none;
    }

    .chat-header .nav .card {
        width: 60%;
        background-color: #fff;
        padding: 16px;
        z-index: 100;
    }

    .chat-header .nav .user-info {
        display: flex;
    }

    .chat-header .nav .user-profile {
        justify-content: space-between;
    }
    .chat-header .nav .logout-btn{
        width: 100%;
    }
}

@media screen and (max-width: 480px) {
    .chat-header .nav .card {
        width: 80%;
    }
}