/* ── Sidebar ─ Steuerpult-Charakter: ruhige Fläche, Signal-Schiene links ── */
#sidebar {
    width: 240px;
    min-width: 240px;
    background: var(--surface-2);
    border-right: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
    align-self: flex-start;
}

.sidebar-tile-nav {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: .2rem;
    padding: 1.1rem .9rem 1.1rem 1.05rem;
    flex-shrink: 0;
}

/* kleines Anker-Label über der Navigation */
.sidebar-tile-nav::before {
    content: "Connector";
    display: block;
    font-size: .66rem;
    font-weight: 600;
    letter-spacing: .14em;
    text-transform: uppercase;
    color: var(--faint);
    padding: 0 .55rem .55rem;
}

/* durchgehende Schiene, an der die Marker der Tiles andocken */
.sidebar-tile-nav::after {
    content: "";
    position: absolute;
    left: calc(.5rem + 1px);
    top: 3rem;
    bottom: 1.1rem;
    width: 1px;
    background: var(--line);
    pointer-events: none;
}

.sidebar-tile {
    position: relative;
    display: flex;
    align-items: center;
    gap: .7rem;
    padding: .58rem .7rem;
    background: transparent;
    border: none;
    border-radius: 9px;
    cursor: pointer;
    font-size: .855rem;
    font-weight: 500;
    color: var(--muted);
    text-align: left;
    width: 100%;
    transition:
        background-color .14s ease-out,
        color .14s ease-out,
        transform .14s ease-out;
}

/* Signal-Marker: dockt links an der Schiene an */
.sidebar-tile::before {
    content: "";
    position: absolute;
    left: -0.55rem;
    top: 50%;
    height: 0;
    width: 3px;
    border-radius: 3px;
    background: var(--accent);
    opacity: 0;
    transform: translateY(-50%);
    transition: height .18s ease-out, opacity .14s ease-out;
}

.tile-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    font-size: .95rem;
    color: var(--faint);
    transition: color .14s ease-out, transform .14s ease-out;
}

.tile-label {
    letter-spacing: .01em;
}

/* Hover: Tönung, Icon färbt sich, sanfter Schub Richtung Inhalt,
   Marker deutet sich an der Schiene an */
.sidebar-tile:hover {
    background: var(--bg);
    color: var(--ink);
    transform: translateX(2px);
}
.sidebar-tile:hover .tile-icon {
    color: var(--accent);
    transform: scale(1.06);
}
.sidebar-tile:hover::before {
    height: 40%;
    opacity: .35;
}

.sidebar-tile:active {
    transform: translateX(1px);
    background: var(--accent-tint);
}

.sidebar-tile:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Aktiv: voller Marker an der Schiene, Tint, kein Effekt-Feuerwerk */
.sidebar-tile.active {
    background: var(--accent-tint);
    color: var(--accent-strong);
    font-weight: 600;
}
.sidebar-tile.active .tile-icon {
    color: var(--accent-strong);
}
.sidebar-tile.active::before {
    height: 62%;
    opacity: 1;
}
.sidebar-tile.active:hover {
    transform: none;
}

@media (prefers-reduced-motion: reduce) {
    .sidebar-tile,
    .sidebar-tile::before,
    .tile-icon {
        transition: none;
    }
    .sidebar-tile:hover,
    .sidebar-tile:hover .tile-icon {
        transform: none;
    }
}

/* ── Main view switching ── */
.main-view { width: 100%; }
.main-view.hidden { display: none; }
.hidden { display: none !important; }