.app-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  isolation: isolate;
  height: calc(var(--header-height) + env(safe-area-inset-top));
  padding: env(safe-area-inset-top) 16px 0;
  background: var(--surface-fixed);
  border-bottom: 1px solid var(--line);
}

.header-content {
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr 96px;
  align-items: center;
  height: var(--header-height);
  max-width: 720px;
  margin: 0 auto;
}

.icon-button {
  grid-column: 1;
  width: 48px;
  height: 48px;
  border: 0;
  color: var(--text-main);
  background: transparent;
  touch-action: manipulation;
}

.icon-button svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
}

.month-select {
  grid-column: 3;
  justify-self: end;
  width: 96px;
  min-height: 44px;
  color: var(--text-main);
  background: #2A2A2C;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}