.stage {
    position: relative;
    width: 100%;
    height: min(72vh, 520px);
    background: #000;
    border-radius: 0.75rem;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.stage-fullscreen-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 36px;
    height: 36px;
    border-radius: 9999px;
    border: 1px solid rgba(255, 255, 255, 0.28);
    background: rgba(15, 23, 42, 0.6);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, background-color 0.2s ease;
}

.stage:hover .stage-fullscreen-btn {
    opacity: 1;
    pointer-events: auto;
}

.stage.fullscreen-active .stage-fullscreen-btn {
    opacity: 0;
    pointer-events: none;
}

.stage.fullscreen-active .stage-fullscreen-btn.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.stage.fullscreen-active.portrait-fallback {
    width: 100vh;
    height: 100vw;
    max-width: none;
    max-height: none;
    border-radius: 0;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(90deg);
}

.stage-fullscreen-btn:hover {
    background: rgba(30, 41, 59, 0.9);
}

.danmu-text {
    position: absolute;
    white-space: nowrap;
    color: #fff;
    font-weight: 700;
    font-size: clamp(2.4rem, 8vw, 6rem);
    animation: danmuMove 8s linear infinite;
    user-select: none;
}

@keyframes danmuMove {
    from {
        transform: translateX(100vw);
    }
    to {
        transform: translateX(-120%);
    }
}

.toast {
    position: fixed;
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    background: #1e293b;
    color: #fff;
    padding: 0.625rem 1.25rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}