.bottom-nav {
  position: fixed;
  left: 50%;
  bottom: 2cm;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  z-index: 100;
  max-width: calc(100vw - 24px);
}

.bottom-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: none;
  background: transparent;
  border-radius: 50%;
  cursor: pointer;
}

.bottom-nav__toggle-icon {
  width: 16px;
  height: 16px;
}

.bottom-nav__items {
  display: flex;
  align-items: center;
  gap: 4px;
  max-width: min(780px, calc(100vw - 84px));
  opacity: 1;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}

.bottom-nav__items::-webkit-scrollbar {
  display: none;
}

.bottom-nav--collapsed .bottom-nav__items {
  max-width: 0;
  opacity: 0;
  margin: 0;
  pointer-events: none;
}

.bottom-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 12px;
  color: #374151;
  text-decoration: none;
  border-radius: 16px;
  white-space: nowrap;
}

.bottom-nav__icon {
  width: 24px;
  height: 24px;
}

.bottom-nav__label {
  font-size: 11px;
}

.bottom-nav__item--active {
  color: #111827;
  font-weight: 600;
}

.chart-grid {
  stroke: #e5e7eb;
  stroke-width: 1;
}

.chart-grid--zero {
  stroke: #9ca3af;
  stroke-dasharray: 4 4;
}

.chart-axis-label {
  fill: #9ca3af;
  font-size: 11px;
  font-family: inherit;
}

.ai-chart-empty {
  margin: 0;
  color: #9ca3af;
  font-size: 13px;
}