/* ==========================================================================
   App layout, mobile first.
   <768px   : top bar + bottom nav + floating "post" button (FAB)
   768-1099 : icon rail on the left, feed in the middle
   >=1100px : left nav with labels | feed | posters column
   ========================================================================== */

.app {
  min-height: 100dvh;
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
}

/* ---------- brand ----------
   Inside the app the brand is only the "posters" wordmark. The "p" tile is
   reserved for the browser tab / app icon (core/static/core/brand/). */

.brand-wordmark {
  height: 30px;
  width: auto;
  max-width: 100%;
  color: var(--text);
}

/* ---------- top bar (mobile) ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: var(--tap) 1fr var(--tap);
  align-items: center;
  height: calc(var(--topbar-h) + var(--safe-top));
  padding: var(--safe-top) var(--space-2) 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--border);
  transition: transform var(--dur-slow) var(--ease-out);
}

.topbar__brand {
  grid-column: 2;
  justify-self: center;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: var(--tap);
}

.topbar__brand .brand-wordmark {
  height: 30px;
}

.topbar__end {
  grid-column: 3;
  justify-self: end;
}

html[data-scroll="down"] .topbar {
  transform: translateY(-100%);
}

/* ---------- side navigation (tablet & desktop) ---------- */

.sidenav {
  display: none;
}

/* ---------- main column ---------- */

.main {
  min-width: 0;
  padding-bottom: calc(var(--bottomnav-h) + var(--safe-bottom) + 96px);
}

/* ---------- posters column / sheet ---------- */

.aside {
  display: none;
}

/* ---------- bottom navigation (mobile) ---------- */

.bottomnav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  height: calc(var(--bottomnav-h) + var(--safe-bottom));
  padding: 0 var(--safe-right) var(--safe-bottom) var(--safe-left);
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-top: 1px solid var(--border);
}

.bottomnav__item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap);
  color: var(--text-2);
  --icon-size: 27px;
  transition: color var(--dur-fast);
}

.bottomnav__item:active .icon {
  transform: scale(0.88);
}

.bottomnav__item .icon {
  transition: transform var(--dur-fast) var(--ease-out);
}

.bottomnav__item.is-active {
  color: var(--text);
}

.bottomnav__item[aria-disabled="true"] {
  color: var(--text-3);
}

/* Active/inactive icon pairs: the filled icon marks the current section */
.nav-icon .icon--on,
.is-active .nav-icon .icon--off {
  display: none;
}

.is-active .nav-icon .icon--on {
  display: block;
}

/* ---------- floating action button (mobile) ---------- */

.fab {
  position: fixed;
  right: calc(var(--space-4) + var(--safe-right));
  bottom: calc(var(--bottomnav-h) + var(--safe-bottom) + var(--space-4));
  z-index: 31;
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: var(--radius-full);
  background: var(--accent);
  color: var(--on-accent);
  box-shadow: var(--shadow-lg);
  --icon-size: 26px;
  transition: transform var(--dur-base) var(--ease-spring), box-shadow var(--dur-base);
}

.fab:active {
  transform: scale(0.9) rotate(-8deg);
}

/* ==========================================================================
   Tablet: icon rail
   ========================================================================== */

@media (min-width: 768px) {
  .app {
    display: grid;
    grid-template-columns: 76px minmax(0, 600px);
    justify-content: center;
    column-gap: var(--space-6);
  }

  .topbar,
  .bottomnav,
  .fab {
    display: none;
  }

  .main {
    padding-top: var(--space-4);
    padding-bottom: var(--space-10);
  }

  .sidenav {
    position: sticky;
    top: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    height: 100dvh;
    padding: var(--space-4) 0;
  }

  .sidenav__brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2);
    margin-bottom: var(--space-3);
    border-radius: var(--radius-md);
  }

  .sidenav__brand {
    min-height: 52px;
  }

  .sidenav__brand .brand-wordmark {
    height: 18px; /* fits the 76px icon rail */
  }

  .sidenav__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    width: 100%;
    align-items: center;
  }

  .sidenav__item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    min-height: 52px;
    min-width: 52px;
    justify-content: center;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
    color: var(--text-2);
    font-size: var(--fs-lg);
    font-weight: 500;
    --icon-size: 27px;
    transition: background-color var(--dur-fast), color var(--dur-fast);
  }

  .sidenav__item:hover {
    background: var(--accent-soft);
    color: var(--text);
  }

  .sidenav__item.is-active {
    color: var(--text);
    font-weight: 700;
  }

  .sidenav__item[aria-disabled="true"] {
    color: var(--text-3);
  }

  .sidenav__label {
    display: none;
  }

  .sidenav .sidenav__compose {
    margin-top: var(--space-3);
    width: 52px;
    height: 52px;
    padding: 0;
    --icon-size: 24px;
  }

  .sidenav .sidenav__compose .sidenav__label {
    display: none;
  }

  .sidenav__footer {
    margin-top: auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
  }

  /* The posters list opens as a sheet on tablet */
  .aside.is-open {
    display: block;
  }
}

/* ==========================================================================
   Desktop: three columns
   ========================================================================== */

@media (min-width: 1100px) {
  .app {
    grid-template-columns: 248px minmax(0, 600px) 320px;
    column-gap: var(--space-8);
  }

  .sidenav {
    align-items: stretch;
    padding: var(--space-5) 0 var(--space-4);
  }

  .sidenav__brand {
    padding: var(--space-1) var(--space-4) var(--space-2);
  }

  .sidenav__brand .brand-wordmark {
    height: 40px;
  }

  .sidenav__list {
    align-items: stretch;
  }

  .sidenav__item {
    justify-content: flex-start;
    padding: var(--space-2) var(--space-4);
  }

  .sidenav__label {
    display: inline;
  }

  .sidenav .sidenav__compose {
    width: 100%;
    height: 52px;
    font-size: var(--fs-lg);
  }

  .sidenav .sidenav__compose .sidenav__label {
    display: inline;
  }

  .sidenav .sidenav__compose .icon {
    display: none;
  }

  .sidenav__footer {
    align-items: stretch;
  }

  .sidenav__item--posters {
    display: none;
  }

  .aside {
    display: block;
    position: sticky;
    top: 0;
    height: 100dvh;
    padding: var(--space-5) 0;
    overflow-y: auto;
  }

  .aside .aside__close,
  .aside .aside__grabber {
    display: none;
  }
}