.app-shell {
  display: flex;
  min-height: 100vh;
  min-height: 100dvh;
}

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  padding: var(--space-5) 0;
  padding-top: calc(var(--space-5) + env(safe-area-inset-top, 0px));
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-5) var(--space-5);
  font-weight: 700;
  font-size: 1.05rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 var(--space-3);
  flex: 1;
}

.nav-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.92rem;
}

.nav-link:hover {
  background: var(--color-surface-alt);
  text-decoration: none;
  color: var(--color-text);
}

.nav-link.active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.sidebar-footer {
  padding: var(--space-3) var(--space-5) 0;
  padding-bottom: env(safe-area-inset-bottom, 0px);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-muted);
  flex-shrink: 0;
}
.status-dot.ok { background: var(--color-status-clean); }
.status-dot.degraded { background: var(--color-status-suspicious); }
.status-dot.down { background: var(--color-status-malicious); }

.main-content {
  flex: 1;
  min-width: 0;
  padding: var(--space-6) var(--space-6);
  padding-top: calc(var(--space-6) + env(safe-area-inset-top, 0px));
  max-width: 1100px;
}

.mobile-nav-toggle {
  display: none;
  position: fixed;
  top: calc(var(--space-3) + env(safe-area-inset-top, 0px));
  left: var(--space-3);
  z-index: 50;
  width: 40px;
  height: 40px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.mobile-nav-toggle span {
  width: 18px;
  height: 2px;
  background: var(--color-text);
  display: block;
}

@media (max-width: 860px) {
  .sidebar {
    position: fixed;
    left: 0; top: 0;
    z-index: 40;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-md);
  }
  .sidebar.open { transform: translateX(0); }
  .mobile-nav-toggle { display: flex; }
  .main-content {
    padding: var(--space-5) var(--space-4);
    padding-top: calc(var(--space-8) + env(safe-area-inset-top, 0px));
    max-width: 100%;
  }
}