/* ============================================================
   Network Activity heatmap — premium visual layer (CSS only).
   Scoped to #page-network-activity. No JS, filters, transforms,
   animations, timers, observers, or runtime changes.
   ============================================================ */

#page-network-activity .na-heatmap-panel {
  background: linear-gradient(
    165deg,
    rgba(11, 23, 26, 0.28) 0%,
    var(--panel) 38%,
    rgba(7, 17, 20, 0.98) 100%
  );
  border-color: rgba(15, 168, 157, 0.12);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.05),
    inset 0 0 32px rgba(15, 168, 157, 0.055);
}

#page-network-activity .na-heatmap-panel .panel-head {
  margin-bottom: 8px;
  gap: 10px 14px;
}

#page-network-activity .na-heatmap-panel .panel-title {
  letter-spacing: 0.01em;
}

#page-network-activity .na-heatmap-panel__subtitle {
  font-size: 12px;
  color: rgba(156, 172, 192, 0.68);
  letter-spacing: 0.02em;
  line-height: 1.4;
  font-weight: 500;
  margin-top: 2px;
}

/* Understated integrated legend */
#page-network-activity .na-heatmap-legend {
  display: flex;
  align-items: center;
  gap: 8px 11px;
  margin: 2px 0 11px 0;
  flex-wrap: wrap;
  padding: 0 2px;
}

#page-network-activity .na-heatmap-legend__label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(148, 163, 184, 0.55);
}

#page-network-activity .na-heatmap-legend__bar {
  flex: 0 1 140px;
  min-width: 92px;
  height: 6px;
  border-radius: 3px;
  border: 1px solid rgba(15, 168, 157, 0.09);
  background: linear-gradient(
    90deg,
    rgba(var(--hm-teal-deep), 0.14) 0%,
    rgba(var(--hm-teal-mid), 0.28) 58%,
    rgba(var(--hm-teal-mid), 0.38) 100%
  );
  box-shadow:
    inset 0 1px 2px rgba(0, 0, 0, 0.18),
    inset 0 -1px 0 rgba(15, 168, 157, 0.08);
}

#page-network-activity .na-heatmap-legend__low,
#page-network-activity .na-heatmap-legend__high {
  font-size: 9px;
  font-family: "JetBrains Mono", monospace;
  color: rgba(148, 163, 184, 0.44);
  letter-spacing: 0.03em;
}

/* Tray: embedded depth inside panel */
#page-network-activity .na-heatmap-tray {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 14px 14px;
  border-radius: 10px;
  border: 1px solid rgba(15, 168, 157, 0.11);
  background: linear-gradient(
    180deg,
    rgba(8, 18, 21, 0.62) 0%,
    rgba(6, 13, 16, 0.48) 100%
  );
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.035),
    inset 0 0 24px rgba(15, 168, 157, 0.045);
}

#page-network-activity .na-heatmap-tray .heatmap-row {
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
}

#page-network-activity .na-heatmap-day-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(156, 172, 192, 0.66);
  font-family: "JetBrains Mono", monospace;
}

#page-network-activity .na-heatmap-tray .heatmap {
  gap: 5px;
}

#page-network-activity .na-heatmap-tray .heat-cell {
  min-width: 12px;
  min-height: 12px;
  border-radius: 5px;
  border: 1px solid rgba(15, 168, 157, 0.07);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.045);
  transition: none;
}

#page-network-activity .na-heatmap-tray .heat-cell:hover {
  outline: 1px solid rgba(15, 168, 157, 0.14);
  outline-offset: 0;
}

#page-network-activity .na-heatmap-axis-row {
  margin-top: 2px;
  padding-top: 5px;
  border-top: 1px solid rgba(15, 168, 157, 0.07);
}

#page-network-activity .na-heatmap-hour-axis {
  display: grid;
  grid-template-columns: repeat(24, 1fr);
  gap: 5px;
  font-size: 10px;
  font-weight: 500;
  color: rgba(148, 163, 184, 0.52);
  text-align: center;
  font-family: "JetBrains Mono", monospace;
  letter-spacing: 0.02em;
}

@media (max-width: 768px) {
  #page-network-activity .na-heatmap-tray {
    padding: 10px 10px 12px;
  }

  #page-network-activity .na-heatmap-tray .heatmap-row {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 10px;
  }

  #page-network-activity .na-heatmap-tray .heat-cell {
    min-width: 10px;
    min-height: 10px;
    border-radius: 4px;
  }

  #page-network-activity .na-heatmap-tray .heatmap {
    gap: 4px;
  }

  #page-network-activity .na-heatmap-hour-axis {
    gap: 4px;
    font-size: 9px;
  }

  #page-network-activity .na-heatmap-legend__bar {
    flex: 0 1 112px;
    min-width: 76px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #page-network-activity .na-heatmap-tray .heat-cell {
    transition: none;
  }
}