.nk-hrb-button {
  position: fixed;
  z-index: 99999;
  bottom: calc(22px + env(safe-area-inset-bottom));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 20px;
  border-radius: 999px;
  background: var(--nk-hrb-bg, #0073cc);
  color: var(--nk-hrb-text, #ffffff) !important;
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 15px;
  font-weight: 800;
  line-height: 1;
  text-decoration: none !important;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.22);
  transition: transform 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
  opacity: 0.96;
  box-sizing: border-box;
}

.nk-hrb-button:hover,
.nk-hrb-button:focus {
  color: var(--nk-hrb-text, #ffffff) !important;
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  opacity: 1;
  outline: none;
}

.nk-hrb-button:focus-visible {
  outline: 3px solid rgba(0, 115, 204, 0.32);
  outline-offset: 4px;
}

.nk-hrb-icon {
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  font-size: 15px;
  line-height: 1;
}

.nk-hrb-label {
  white-space: nowrap;
}

.nk-hrb-bottom-center {
  left: 50%;
  transform: translateX(-50%);
}

.nk-hrb-bottom-center:hover,
.nk-hrb-bottom-center:focus {
  transform: translateX(-50%) translateY(-3px);
}

.nk-hrb-bottom-right {
  right: 22px;
}

.nk-hrb-bottom-left {
  left: 22px;
}

@media (max-width: 600px) {
  .nk-hrb-button {
    bottom: calc(16px + env(safe-area-inset-bottom));
    min-height: 44px;
    padding: 11px 17px;
    font-size: 14px;
  }

  .nk-hrb-bottom-right {
    right: 14px;
  }

  .nk-hrb-bottom-left {
    left: 14px;
  }
}