/* ============================================================================
   et-sheet: a panel that slides up from the bottom (Share, Save options,
   choose a language). On a wide screen it becomes a centred dialog.

   Markup is written by ET.ui.sheet (js/ui/sheet.js), which also traps focus,
   closes on Escape, on the scrim and on a downward swipe of the handle, and
   puts focus back where it was.

     <div class="et-sheet" role="dialog" aria-modal="true" aria-labelledby="…">
       <div class="et-sheet__scrim"></div>
       <div class="et-sheet__panel">
         <div class="et-sheet__handle"></div>
         <header class="et-sheet__head"><h2>…</h2><button class="et-sheet__close">…</button></header>
         <div class="et-sheet__body">…</div>
       </div>
     </div>

   State: .is-open (set a frame after insertion so the slide plays).
   ========================================================================= */

.et-sheet {
  position: fixed;
  inset: 0;
  z-index: var(--et-z-sheet);
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.et-sheet__scrim {
  position: absolute; inset: 0;
  background: var(--et-scrim);
  opacity: 0;
  transition: opacity var(--et-dur-slow) var(--et-ease-out);
}
.et-sheet__panel {
  position: relative;
  width: 100%;
  max-width: 36rem;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  background: var(--et-surface);
  color: var(--et-text);
  border-radius: var(--et-radius-xl) var(--et-radius-xl) 0 0;
  box-shadow: var(--et-shadow-3);
  padding-bottom: env(safe-area-inset-bottom);
  transform: translateY(100%);
  transition: transform var(--et-dur-slow) var(--et-ease-out);
  will-change: transform;
}
.et-sheet.is-open .et-sheet__scrim { opacity: 1; }
.et-sheet.is-open .et-sheet__panel { transform: translateY(var(--drag, 0px)); }
.et-sheet.is-dragging .et-sheet__panel { transition: none; }
.et-sheet.is-closing .et-sheet__panel {
  transition-timing-function: var(--et-ease-in);
  transition-duration: var(--et-dur-base);
}

.et-sheet__handle {
  flex: none;
  width: 100%;
  height: var(--et-space-6);
  display: grid; place-items: center;
  cursor: grab;
  touch-action: none;
}
.et-sheet__handle::before {
  content: "";
  width: 3rem; height: 5px;
  border-radius: var(--et-radius-pill);
  background: var(--et-line-strong);
}
.et-sheet__head {
  display: flex;
  align-items: center;
  gap: var(--et-space-3);
  padding: 0 var(--et-space-5) var(--et-space-3);
}
.et-sheet__head h2 { flex: 1; margin: 0; font-size: var(--et-text-xl); }
.et-sheet__close {
  display: grid; place-items: center;
  flex: none;
  width: var(--et-tap-min); height: var(--et-tap-min);
  border: 0; border-radius: 50%;
  background: var(--et-sunk);
  color: var(--et-text);
  cursor: pointer;
}
.et-sheet__close .et-icon { width: 1.3rem; height: 1.3rem; }
.et-sheet__body {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding: 0 var(--et-space-5) var(--et-space-5);
}

/* Wide screens: a centred dialog that fades and rises a little. */
@media (min-width: 48rem) {
  .et-sheet { align-items: center; padding: var(--et-space-6); }
  .et-sheet__panel {
    border-radius: var(--et-radius-xl);
    transform: translateY(var(--et-space-5)) scale(.98);
    opacity: 0;
    transition:
      transform var(--et-dur-slow) var(--et-ease-out),
      opacity   var(--et-dur-base) var(--et-ease-out);
  }
  .et-sheet.is-open .et-sheet__panel { transform: none; opacity: 1; }
  .et-sheet__handle { height: var(--et-space-5); }
  .et-sheet__handle::before { display: none; }
}

/* The page behind a sheet does not scroll. */
html.et-has-sheet, html.et-has-sheet body { overflow: hidden; }