/* ─── App Shell Layout ─── */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  min-height: 100vh;
}

/* ─── Topbar ─── */
.topbar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: var(--topbar-h);
  background: var(--bg-1);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.topbar-brand { display: flex; align-items: center; gap: 14px; }
.netshield-logo { font-family: var(--font-mono); font-size: 16px; font-weight: 700; letter-spacing: 5px; color: var(--tx-0); }
.netshield-logo span { color: var(--accent); font-weight: 400; }
.topbar-div { width: 1px; height: 22px; background: var(--border); }
.topbar-sub { font-size: var(--fs-xs); color: var(--tx-2); letter-spacing: 1.5px; text-transform: uppercase; }
.topbar-right { display: flex; align-items: center; gap: 16px; font-size: var(--fs-sm); color: var(--tx-2); }
.topbar-right .client { color: var(--tx-1); font-weight: 600; letter-spacing: .5px; }
.live-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); display: inline-block; margin-right: 4px; animation: pulseDot 2s ease infinite; }
.topbar-logout {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 10px;
  color: var(--tx-2);
  font-size: var(--fs-xs);
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all .15s;
}
.topbar-logout:hover { border-color: var(--accent); color: var(--accent); }

/* ─── Sidebar ─── */
.sidebar {
  grid-row: 2;
  background: var(--bg-1);
  border-right: 1px solid var(--border);
  padding: 12px 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
}
.sidebar-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 18px;
  color: var(--tx-2);
  text-decoration: none;
  font-size: var(--fs-base);
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all .15s;
  cursor: pointer;
}
.sidebar-item:hover { color: var(--tx-1); background: var(--bg-2); }
.sidebar-item.active { color: var(--accent); border-left-color: var(--accent); background: var(--accent-dim); }
.sidebar-item svg { width: 18px; height: 18px; flex-shrink: 0; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.sidebar-label { white-space: nowrap; }
.sidebar-spacer { flex: 1; }
.sidebar-footer { padding: 12px 18px; font-size: var(--fs-xs); color: var(--tx-3); border-top: 1px solid var(--border); margin-top: auto; }

/* ─── Content ─── */
#content {
  grid-row: 2;
  padding: var(--sp-lg) var(--sp-xl) 60px;
  max-width: 1600px;
  overflow-y: auto;
  height: calc(100vh - var(--topbar-h));
}

/* ─── Loading ─── */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: calc(100vh - var(--topbar-h));
  flex-direction: column;
  gap: 16px;
}
.loading-spinner { width: 28px; height: 28px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .7s linear infinite; }
.loading-text { font-size: var(--fs-sm); color: var(--tx-2); letter-spacing: 2px; text-transform: uppercase; }

/* ─── Section/Grid utilities ─── */
.section { margin-bottom: var(--sp-xl); }
.section-head { display: flex; align-items: center; gap: 10px; margin-bottom: var(--sp-md); }
.section-head h2 { font-size: var(--fs-sm); font-weight: 600; letter-spacing: 1.8px; text-transform: uppercase; color: var(--tx-2); white-space: nowrap; }
.section-head .line { flex: 1; height: 1px; background: var(--border); }
.section-head .count { font-size: var(--fs-xs); color: var(--tx-3); background: var(--bg-2); padding: 2px 8px; border-radius: 10px; border: 1px solid var(--border); white-space: nowrap; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.page-title { font-size: var(--fs-xl); font-weight: 700; color: var(--tx-0); margin-bottom: 4px; }
.page-subtitle { font-size: var(--fs-md); color: var(--tx-2); margin-bottom: var(--sp-lg); line-height: 1.6; }

@media (max-width: 1200px) {
  .app-shell { grid-template-columns: var(--sidebar-collapsed) 1fr; }
  .sidebar-label { display: none; }
  .sidebar-item { justify-content: center; padding: 10px; }
  .sidebar-footer { display: none; }
  .split { grid-template-columns: 1fr; }
}