.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 24px 18px;
    border-right: 1px solid var(--border);
    background: rgba(5, 10, 25, 0.64);
    backdrop-filter: blur(22px);
    display: flex;
    flex-direction: column;
    gap: 28px;
    z-index: 50;
}

.sidebar__brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.brand__mark {
    width: 46px;
    height: 46px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    font-weight: 800;
    letter-spacing: -0.06em;
    color: #07111f;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    box-shadow: var(--shadow-glow);
}

.brand__text { display: grid; gap: 2px; }
.brand__text strong { font-size: 1rem; }
.brand__text small { color: var(--text-muted); font-size: .78rem; }

.sidebar__nav {
    display: grid;
    gap: 8px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 46px;
    padding: 0 14px;
    border-radius: 16px;
    color: var(--text-muted);
    transition: background .2s ease, color .2s ease, transform .2s ease;
}

.nav-item:hover,
.nav-item.is-active {
    color: var(--text);
    background: var(--surface-strong);
    transform: translateX(2px);
}

.nav-item__icon {
    width: 24px;
    text-align: center;
    color: var(--primary);
}

.sidebar__panel {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    color: var(--text);
}

.sidebar__panel--link {
    text-decoration: none;
    cursor: pointer;
    transition: border-color .2s ease, background .2s ease, transform .2s ease;
}

.sidebar__panel--link:hover {
    border-color: rgba(255, 255, 255, .22);
    background: var(--surface-strong);
    transform: translateY(-1px);
}

.sidebar__panel small {
    display: block;
    color: var(--text-muted);
    margin-top: 2px;
}

.status-dot {
    width: 12px;
    height: 12px;
    flex: 0 0 12px;
    border-radius: 999px;
    background: #94a3b8;
    box-shadow: 0 0 0 8px rgba(148, 163, 184, .12);
}

.status-dot--success {
    background: var(--success, #4ade80);
    box-shadow: 0 0 0 8px rgba(74, 222, 128, .14);
}

.status-dot--warning,
.status-dot--error {
    background: #f97316;
    box-shadow: 0 0 0 8px rgba(249, 115, 22, .18);
}

.status-dot--unknown {
    background: #94a3b8;
    box-shadow: 0 0 0 8px rgba(148, 163, 184, .12);
}

.app-main {
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.topbar {
    min-height: var(--topbar-height);
    display: grid;
    grid-template-columns: auto minmax(180px, 1fr);
    align-items: center;
    gap: 20px;
    padding: 20px clamp(18px, 3vw, 34px);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
    position: sticky;
    top: 0;
    z-index: 30;
}

.topbar__title span {
    display: block;
    color: var(--primary);
    font-size: .78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .11em;
    margin-bottom: 4px;
}

.topbar__title h1 {
    margin: 0;
    font-size: clamp(1.35rem, 2vw, 2rem);
    letter-spacing: -0.04em;
}

.content {
    width: min(100%, var(--content-max));
    margin: 0 auto;
    padding: clamp(18px, 3vw, 34px);
    flex: 1;
}

.app-footer {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 22px clamp(18px, 3vw, 34px);
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

.sidebar__close,
.topbar__menu,
.sidebar-backdrop { display: none; }

@media (max-width: 1080px) {
    .app-shell { grid-template-columns: 1fr; }

    .sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        width: min(88vw, var(--sidebar-width));
        transform: translateX(-105%);
        transition: transform .25s ease;
    }

    body.sidebar-open .sidebar { transform: translateX(0); }

    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, .48);
        z-index: 40;
    }

    body.sidebar-open .sidebar-backdrop { display: block; }
    .sidebar__close, .topbar__menu { display: inline-grid; }

    .topbar {
        grid-template-columns: auto 1fr;
    }

}

@media (max-width: 680px) {
    .app-footer { flex-direction: column; }
}