.rb-header {
  padding: 12px;
}

.rb-header__bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  height: var(--size-header);
  padding: 8px 20px 8px 8px;
  border-radius: var(--radius-header);
  background: var(--panel);
  box-shadow: var(--shadow-header);
}

.rb-header__logo {
  display: flex;
  justify-self: start;
  padding: 8px;
  transition: transform .3s ease-in-out;
}

.rb-header__logo:hover { transform: scale(1.05); }

.rb-header__logo-img {
  display: block;
  width: var(--size-header-logo);
  height: var(--size-header-logo);
}

.rb-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 8px;
}

.rb-nav__item {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: var(--size-nav-item);
  padding: 12px 0 14px;
  border-radius: var(--radius-nav-item);
  color: var(--color-nav-text);
  font-size: var(--text-nav-size);
  font-weight: var(--text-nav-weight);
  line-height: var(--text-nav-line);
  letter-spacing: var(--text-nav-tracking);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .15s;
}

.rb-nav__item:hover,
.rb-nav__item.is-active { background: var(--color-nav-hover); }

.rb-nav__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 32px;
  color: var(--color-nav-icon);
}

.rb-nav__item.is-active .rb-nav__icon { color: var(--color-nav-icon-active); }

.rb-nav__svg,
.rb-nav__img {
  display: block;
  width: 24px;
  height: 24px;
}

@media (max-width: 1024px) {
  :root { --size-nav-item: 84px; }
}

@media (max-width: 767px) {
  :root {
    --size-header: var(--size-header-mobile);
    --size-header-logo: var(--size-header-logo-mobile);
    --size-nav-item: auto;
  }

  body { padding-bottom: calc(var(--size-tabbar) + env(safe-area-inset-bottom)); }

  .rb-header { padding: 0 0 12px; }

  .rb-header__bar {
    grid-template-columns: 1fr;
    padding: 0 10px;
    border-radius: 0;
  }

  .rb-header__logo:hover { transform: none; }

  .rb-nav {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 50;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    padding: 0 8px env(safe-area-inset-bottom);
    background: var(--panel);
    border-top: 1px solid var(--color-tabbar-line);
    box-shadow: var(--shadow-tabbar);
  }

  .rb-nav__item {
    height: var(--size-tabbar);
    padding: 8px 0 10px;
  }

  .rb-nav__item--desktop { display: none; }
}