.root {
  position: fixed;
  bottom: calc(var(--app-safe-bottom, 0px) + 12px);
  left: 50%;
  z-index: 30;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  box-sizing: border-box;
  width: min(
    calc(100vw - var(--app-safe-left, 0px) - var(--app-safe-right, 0px) - 28px),
    calc(var(--app-max-width, 540px) - 28px)
  );
  margin: 0 auto;
  padding: 8px;
  border: 1px solid var(--nav-border);
  border-radius: 28px;
  background: var(--nav-background);
  box-shadow: var(--nav-shadow);
  transform: translateX(-50%);
  backdrop-filter: blur(20px) saturate(1.2);
}

.warm {
  --nav-background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 240, 230, 0.8)),
    rgba(255, 255, 255, 0.78);
  --nav-border: rgba(255, 116, 159, 0.18);
  --nav-shadow:
    0 20px 48px rgba(131, 72, 85, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.92);
  --nav-button-color: #80686f;
  --nav-button-hover-background: rgba(255, 116, 159, 0.1);
  --nav-button-hover-color: #2d2024;
  --nav-active-background: linear-gradient(135deg, #fff4ec, #ffe5f0);
  --nav-active-border: rgba(255, 116, 159, 0.26);
  --nav-active-color: #201417;
  --nav-active-shadow: 0 12px 26px rgba(255, 116, 159, 0.16);
  --nav-focus-color: #ff5d95;
}

.dark {
  --nav-background:
    linear-gradient(135deg, rgba(36, 22, 39, 0.78), rgba(255, 255, 255, 0.1)),
    rgba(23, 16, 28, 0.72);
  --nav-border: rgba(255, 255, 255, 0.18);
  --nav-shadow:
    0 22px 52px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
  --nav-button-color: rgba(255, 255, 255, 0.78);
  --nav-button-hover-background: rgba(255, 255, 255, 0.12);
  --nav-button-hover-color: #ffffff;
  --nav-active-background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.22), rgba(255, 116, 159, 0.2));
  --nav-active-border: rgba(255, 255, 255, 0.3);
  --nav-active-color: #ffffff;
  --nav-active-shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
  --nav-focus-color: #ffffff;
}

.button {
  display: flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 22px;
  background: transparent;
  color: var(--nav-button-color);
  cursor: pointer;
  font: inherit;
  font-size: clamp(12px, 2.963vw, 14px);
  font-weight: 820;
  transition:
    background 0.18s ease,
    color 0.18s ease,
    transform 0.18s ease;
}

.button:hover {
  background: var(--nav-button-hover-background);
  color: var(--nav-button-hover-color);
}

.button:active {
  transform: scale(0.98);
}

.button:focus-visible {
  outline: 2px solid var(--nav-focus-color);
  outline-offset: 3px;
}

.active {
  border-color: var(--nav-active-border);
  background: var(--nav-active-background);
  color: var(--nav-active-color);
  box-shadow: var(--nav-active-shadow);
}