/* Kompaktes, wiederverwendbares CRT-Modul für die Rückkehr zur
   vorherigen logischen Ebene. Die umgebende Seite liefert Systemtokens. */

.system-back-nav {
    position: relative;
    display: flex;
    align-items: center;
    min-height: 52px;
    overflow: hidden;
    isolation: isolate;
    padding: 13px 24px;
    border: 1px solid var(--system-nav-line, rgba(255, 79, 216, .34));
    border-radius: 5px;
    background: var(--system-nav-bg, rgba(255, 79, 216, .035));
    color: var(--system-nav-muted, #9E718E);
    text-decoration: none;
    cursor: pointer;
    box-shadow:
        inset 0 0 24px rgba(255, 79, 216, .035),
        0 0 10px rgba(255, 38, 190, .06);
    transition:
        border-color .18s ease,
        background-color .18s ease,
        color .18s ease,
        box-shadow .18s ease;
}

.system-back-nav-label {
    position: relative;
    z-index: 2;
    font-size: var(--font-ui, 16px);
    letter-spacing: .06em;
    text-shadow: 0 0 6px rgba(255, 79, 216, .12);
}

.system-back-nav-group {
    justify-content: space-between;
    gap: 28px;
    cursor: default;
}

.system-back-nav-action {
    position: relative;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    min-height: 28px;
    color: inherit;
    text-decoration: none;
    transition: color .18s ease, text-shadow .18s ease;
}

.system-back-nav-secondary {
    color: var(--system-nav-muted, #9E718E);
}

.system-back-nav-action:focus-visible {
    outline: 1px solid var(--system-nav-active, #FFD0F2);
    outline-offset: 4px;
    color: var(--system-nav-active, #FFD0F2);
    text-shadow: 0 0 6px rgba(255, 79, 216, .24);
}

.system-back-nav-trace {
    position: absolute;
    z-index: 1;
    top: 50%;
    right: -72px;
    width: 72px;
    height: 1px;
    pointer-events: none;
    background: linear-gradient(90deg, transparent, rgba(255, 143, 224, .56), var(--system-nav-active, #FFD0F2));
    box-shadow: 0 0 7px rgba(255, 79, 216, .34);
    opacity: 0;
    animation: systemBackTrace 8.8s ease-out infinite;
}

@keyframes systemBackTrace {
    0%, 69%, 100% { right: -72px; opacity: 0; }
    72% { opacity: .55; }
    80% { right: calc(100% - 92px); opacity: .22; }
    84% { right: calc(100% - 54px); opacity: 0; }
}

.system-back-nav:focus-visible {
    outline: 1px solid var(--system-nav-active, #FFD0F2);
    outline-offset: 3px;
    color: var(--system-nav-active, #FFD0F2);
    border-color: rgba(255, 143, 224, .68);
    box-shadow:
        inset 0 0 30px rgba(255, 79, 216, .065),
        0 0 6px rgba(255, 143, 224, .22),
        0 0 14px rgba(255, 38, 190, .14);
}

@media (hover: hover) and (pointer: fine) {
    .system-back-nav:hover {
        color: var(--system-nav-active, #FFD0F2);
        border-color: rgba(255, 143, 224, .62);
        background-color: rgba(255, 79, 216, .058);
        box-shadow:
            inset 0 0 30px rgba(255, 79, 216, .065),
            0 0 6px rgba(255, 143, 224, .22),
            0 0 14px rgba(255, 38, 190, .14);
    }


    .system-back-nav-group:hover {
        color: var(--system-nav-muted, #9E718E);
    }

    .system-back-nav-action:hover {
        color: var(--system-nav-active, #FFD0F2);
        text-shadow: 0 0 6px rgba(255, 79, 216, .24);
    }
}

@media (max-width: 600px) {
    .system-back-nav {
        min-height: 48px;
        padding: 12px 14px;
        border-radius: 4px;
    }


    .system-back-nav-group {
        gap: 18px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .system-back-nav-trace {
        display: none;
        animation: none !important;
    }
}