.sidebar-container {
    grid-column: 1;
    grid-row: 1 / 3;
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 12px 0;
    gap: 2px;
    overflow: hidden;
}

.nav-item {
    display: flex;
    align-items: center;
    height: 40px;
    margin: 0 8px;
    color: var(--text-muted);
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    user-select: none;
    overflow: hidden;
}

.nav-item:hover { background-color: rgba(255,255,255,0.05); color: var(--text-primary); }
.nav-item.active { color: var(--accent); }
.nav-item--disabled { opacity: 0.35; cursor: default; }
.nav-item--disabled:hover { background-color: transparent; color: var(--text-muted); }

/* Icon column — fixed width matching the collapsed sidebar minus margins.
   Always text-centered, so the icon sits in the same spot at any sidebar width. */
.nav-item i {
    width: 40px;
    flex-shrink: 0;
    font-size: 20px;
    text-align: center;
    pointer-events: none;
}

/* Label column — slides in/out independently */
.nav-label {
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    max-width: 120px;
    padding-right: 12px;
    opacity: 1;
    transition: max-width 0.25s ease, opacity 0.2s ease;
    pointer-events: none;
}

.window-wrapper.sidebar-collapsed .nav-label {
    max-width: 0;
    opacity: 0;
}

/* Toggle button */
.sidebar-toggle {
    margin: 8px;
    padding: 8px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: color 0.15s, border-color 0.15s;
}

.sidebar-toggle:hover { color: var(--text-primary); border-color: var(--text-muted); }
.sidebar-toggle i { font-size: 16px; pointer-events: none; transition: transform 0.25s ease; }

.window-wrapper.sidebar-collapsed .sidebar-toggle i {
    transform: rotate(180deg);
}

/* ── Mobile hamburger button ── */
.mobile-hamburger {
    display: flex;
    position: fixed;
    right: 12px;
    top: 7px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 200;
    transition: color 0.15s, border-color 0.15s;
}

.mobile-hamburger:hover { color: var(--text-primary); border-color: var(--text-muted); }
.mobile-hamburger i { font-size: 18px; pointer-events: none; }

/* Hide on confirmed desktop (hover-capable, fine pointer) */
@media (hover: hover) and (pointer: fine) {
    .mobile-hamburger { display: none; }
}

/* ── Mobile backdrop ── */
.mobile-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    z-index: 999;
}

.mobile-backdrop.open { display: block; }

/* ── Mobile nav drawer ── */
.mobile-drawer {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 220px;
    height: 100vh;
    height: 100dvh;
    background: var(--surface);
    border-right: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 0;
    gap: 2px;
    z-index: 1000;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    overflow-y: auto;
}

.mobile-drawer.open { transform: translateX(0); }

@media (hover: none) and (pointer: coarse) {
    .mobile-drawer { display: flex; }
}