body.home-page,
body.map-page,
body.study-page,
body.drill-page,
body.expressions-page,
body:not([class]) {
  --sidebar-width: 285px;
}

.navigation-streak-status {
  display: none;
}

.app-shell > .side-navigation {
  position: sticky;
  z-index: 30;
  top: 0;
  right: auto;
  bottom: auto;
  left: auto;
  display: flex;
  width: auto;
  height: 100vh;
  flex-direction: column;
  align-items: stretch;
  padding: 26px 16px 18px;
  overflow: visible;
  border: 0;
  border-right: 1px solid rgba(43, 91, 105, 0.4);
  border-radius: 0;
  background: rgba(2, 10, 22, 0.98);
  backdrop-filter: none;
}

.app-shell > .side-navigation .brand {
  display: flex;
  min-height: 58px;
  align-items: center;
  gap: 12px;
  padding: 2px 11px 18px;
  color: var(--text);
  text-decoration: none;
}

.app-shell > .side-navigation .brand img {
  width: 48px;
  height: 48px;
  flex: 0 0 auto;
  filter: saturate(0.45) brightness(1.22);
}

.app-shell > .side-navigation .brand strong {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.035em;
  line-height: 1.25;
  text-transform: uppercase;
}

.app-shell > .side-navigation .primary-navigation,
.app-shell > .side-navigation .secondary-navigation {
  display: grid;
  height: auto;
  grid-template-columns: none;
  gap: 6px;
  margin-top: 18px;
}

.app-shell > .side-navigation .secondary-navigation {
  margin-top: auto;
}

.app-shell > .side-navigation .navigation-item {
  display: grid;
  width: auto;
  min-height: 50px;
  grid-template-columns: 30px minmax(0, 1fr);
  grid-template-rows: none;
  align-items: center;
  justify-content: normal;
  justify-items: stretch;
  gap: 12px;
  padding: 9px 13px;
  border-radius: 8px;
  color: #b8c7ca;
  background: transparent;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: background 120ms ease, color 120ms ease;
}

.app-shell > .side-navigation .navigation-item:hover:not(.is-disabled) {
  background: rgba(16, 61, 72, 0.38);
  color: var(--text);
}

.app-shell > .side-navigation .navigation-item.is-current {
  background: linear-gradient(90deg, rgba(14, 107, 109, 0.68), rgba(9, 65, 74, 0.55));
  color: var(--teal-soft);
}

.app-shell > .side-navigation .navigation-item.is-disabled {
  color: #3d5158;
}

.app-shell > .side-navigation .navigation-icon {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  color: currentColor;
  line-height: 1;
  filter: none;
  transition: filter 140ms ease, transform 140ms ease;
}

.app-shell > .side-navigation .navigation-icon svg {
  width: 23px;
  height: 23px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.55;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.app-shell > .side-navigation .navigation-item:hover:not(.is-disabled) .navigation-icon {
  transform: translateX(1px);
}

.app-shell > .side-navigation .navigation-item.is-current .navigation-icon {
  filter: drop-shadow(0 0 5px rgba(99, 216, 209, 0.45));
}

@media (max-width: 1180px) {
  body.home-page,
  body.map-page,
  body.study-page,
  body.drill-page,
  body.expressions-page,
  body:not([class]) {
    --sidebar-width: 76px;
  }

  .app-shell > .side-navigation {
    align-items: center;
    padding: 26px 9px 18px;
  }

  .app-shell > .side-navigation .brand {
    padding-inline: 4px;
  }

  .app-shell > .side-navigation .brand strong,
  .app-shell > .side-navigation .navigation-item > span:last-child {
    display: none;
  }

  .app-shell > .side-navigation .brand img {
    width: 46px;
    height: 46px;
  }

  .app-shell > .side-navigation .navigation-item {
    width: 50px;
    grid-template-columns: 1fr;
    justify-items: center;
    padding-inline: 6px;
  }
}

@media (max-width: 720px) {
  body.home-page,
  body.map-page,
  body.study-page,
  body.drill-page,
  body.expressions-page,
  body:not([class]) {
    --sidebar-width: 0px;
    padding-bottom: 68px;
  }

  .app-shell {
    display: block;
  }

  .app-shell > .side-navigation {
    position: fixed;
    z-index: 80;
    top: auto;
    right: 0;
    bottom: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 64px;
    padding: 6px 8px;
    overflow: hidden;
    border: 0;
    border-top: 1px solid var(--border);
    border-radius: 0;
    background: rgba(2, 10, 22, 0.98);
    backdrop-filter: blur(14px);
  }

  .app-shell > .side-navigation .brand,
  .app-shell > .side-navigation .secondary-navigation,
  .app-shell > .side-navigation .primary-navigation .navigation-item:nth-child(n + 5) {
    display: none;
  }

  .app-shell > .side-navigation .primary-navigation {
    display: grid;
    height: 100%;
    grid-template-columns: repeat(4, 1fr);
    gap: 3px;
    margin: 0;
  }

  .app-shell > .side-navigation .primary-navigation .navigation-item {
    display: grid;
    width: auto;
    min-height: 50px;
    grid-template-columns: 1fr;
    grid-template-rows: 24px auto;
    gap: 1px;
    padding: 4px 2px;
    justify-items: center;
    font-size: 9px;
  }

  .app-shell > .side-navigation .primary-navigation .navigation-item > span:last-child {
    display: block;
  }

  .app-shell > .side-navigation .navigation-icon {
    width: 26px;
    height: 26px;
    font-size: 18px;
  }
}

/* Desktop and tablet navigation follows the approved Maps landing composition:
   a slim horizontal atlas bar, with Home handled by the brand mark. */
@media (min-width: 721px) {
  body.home-page,
  body.map-page,
  body.study-page,
  body.drill-page,
  body.expressions-page,
  body:not([class]) {
    --sidebar-width: 0px;
    --top-navigation-height: 84px;
  }

  .app-shell {
    display: block;
    min-height: 100vh;
  }

  .app-shell > .side-navigation {
    position: sticky;
    z-index: 80;
    top: 0;
    display: flex;
    width: 100%;
    height: var(--top-navigation-height);
    box-sizing: border-box;
    flex-direction: row;
    align-items: center;
    padding: 0 clamp(24px, 3.2vw, 56px);
    border: 0;
    border-bottom: 1px solid rgba(54, 75, 96, 0.46);
    background: rgba(9, 9, 10, 0.96);
    backdrop-filter: blur(18px);
  }

  .app-shell > .side-navigation .brand {
    display: flex;
    min-height: 0;
    align-items: center;
    gap: 12px;
    padding: 0;
  }

  .app-shell > .side-navigation .brand img {
    display: block;
    width: 42px;
    height: 42px;
    filter: none;
  }

  .app-shell > .side-navigation .brand strong {
    display: block;
    color: #f0eeee;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.095em;
    line-height: 1.18;
    text-transform: uppercase;
  }

  .navigation-streak-status {
    display: flex;
    min-width: 0;
    align-items: center;
    gap: 7px;
    margin-left: clamp(18px, 2.2vw, 34px);
    padding-left: 16px;
    border-left: 1px solid rgba(113, 137, 151, 0.3);
    color: #eef2f3;
  }

  .navigation-streak-status svg {
    width: 20px;
    height: 25px;
    flex: 0 0 auto;
    fill: #ef8847;
    filter: drop-shadow(0 0 7px rgba(239, 136, 71, 0.2));
  }

  .navigation-streak-status > span {
    display: grid;
    align-items: center;
  }

  .navigation-streak-status strong {
    font-size: 14px;
    font-weight: 650;
    line-height: 1;
  }

  .navigation-streak-status small {
    margin-top: 2px;
    color: #8e9aa0;
    font-size: 8px;
    font-weight: 650;
    letter-spacing: 0.12em;
    line-height: 1.2;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .app-shell > .side-navigation .primary-navigation {
    display: flex;
    height: 100%;
    align-items: stretch;
    gap: clamp(5px, 1.15vw, 22px);
    margin: 0 0 0 auto;
  }

  .app-shell > .side-navigation .secondary-navigation,
  .app-shell > .side-navigation .primary-navigation .navigation-item:nth-child(5),
  .app-shell > .side-navigation .primary-navigation .navigation-item:nth-child(7) {
    display: none;
  }

  .app-shell > .side-navigation .navigation-item,
  .app-shell > .side-navigation .primary-navigation .navigation-item {
    position: relative;
    display: flex;
    width: auto;
    min-height: var(--top-navigation-height);
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 2px clamp(8px, 0.9vw, 16px) 0;
    border-radius: 0;
    background: transparent;
    color: #9ca3aa;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.2em;
    line-height: 1;
    text-transform: uppercase;
    transition: color 150ms ease;
  }

  .app-shell > .side-navigation .primary-navigation .navigation-item > span:last-child {
    display: block;
  }

  .app-shell > .side-navigation .navigation-icon {
    display: none;
  }

  .app-shell > .side-navigation .navigation-item::after {
    position: absolute;
    right: 10px;
    bottom: 18px;
    left: 10px;
    height: 1px;
    background: linear-gradient(90deg, #70ded9, #b978d3);
    content: "";
    opacity: 0;
    transform: scaleX(0.45);
    transition:
      opacity 150ms ease,
      transform 150ms ease;
  }

  .app-shell > .side-navigation .navigation-item:hover:not(.is-disabled) {
    background: transparent;
    color: #f0eeee;
  }

  .app-shell > .side-navigation .navigation-item:hover:not(.is-disabled)::after,
  .app-shell > .side-navigation .navigation-item.is-current::after {
    opacity: 1;
    transform: scaleX(1);
  }

  .app-shell > .side-navigation .navigation-item.is-current {
    background: transparent;
    color: #eef2f4;
  }

  .app-shell > .side-navigation .primary-navigation .navigation-item:nth-child(6),
  .app-shell > .side-navigation .primary-navigation .navigation-item:nth-child(8) {
    display: flex;
    color: #7e878f;
  }

  .map-page .map-workspace {
    margin-top: calc(-1 * var(--top-navigation-height));
  }
}

@media (min-width: 721px) and (max-width: 940px) {
  .app-shell > .side-navigation {
    padding-inline: 18px;
  }

  .app-shell > .side-navigation .brand strong {
    display: none;
  }

  .navigation-streak-status {
    margin-left: 13px;
    padding-left: 12px;
  }

  .app-shell > .side-navigation .primary-navigation {
    gap: 2px;
  }

  .app-shell > .side-navigation .navigation-item,
  .app-shell > .side-navigation .primary-navigation .navigation-item {
    padding-inline: 8px;
    letter-spacing: 0.14em;
  }
}

@media (min-width: 721px) and (prefers-reduced-motion: reduce) {
  .app-shell > .side-navigation .navigation-item,
  .app-shell > .side-navigation .navigation-item::after {
    transition: none;
  }
}