/* ==============================================================================
   Oliview ChatA - 2026 Mobile Responsive Design & Bottom Sheet (Spec 038 US4)
   Thumb-Zone, Horizontal Swipe Chips, Slide-up Bottom Sheet Drawer, Safe-Area
   ============================================================================== */

@media (max-width: 768px) {
  .app-container {
    padding: 1rem 0.75rem 5.5rem 0.75rem;
  }

  .app-title {
    font-size: 24px;
  }

  .app-subtitle {
    font-size: 12.5px;
  }

  /* Top Panel: Compact 1-Column Carousel */
  .top-panel {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 14px;
    margin-bottom: 16px;
  }

  /* Horizontal Scrollable Brand & Category Bars */
  .brand-box,
  .category-pills,
  .attribute-box {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    scrollbar-width: none; /* Firefox */
  }

  .brand-box::-webkit-scrollbar,
  .category-pills::-webkit-scrollbar,
  .attribute-box::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
  }

  .brand-chip,
  .cat-pill,
  .attribute-chip {
    flex-shrink: 0;
  }

  .example-queries {
    display: grid;
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .btn-example {
    min-height: 42px;
    padding: 8px 12px;
    font-size: 12.5px;
  }

  /* Chat Messages Full Width */
  .message-bubble {
    max-width: 90%;
    font-size: 13.5px;
    padding: 12px 14px;
  }

  .avatar {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  /* Bottom Bar Safe Area for iPhone / Android Home Indicator */
  .bottom-bar-wrapper {
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
  }

  .bottom-bar-container {
    padding: 0 0.5rem;
  }
}

/* ==============================================================================
   5. Slide-up Bottom Sheet Drawer (Mobile Review Preview)
   ============================================================================== */
.bottom-sheet-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.bottom-sheet-overlay.open {
  display: block;
  opacity: 1;
}

.bottom-sheet-drawer {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: #ffffff;
  border-top-left-radius: 20px;
  border-top-right-radius: 20px;
  max-height: 80vh;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
  z-index: 1001;
  display: flex;
  flex-direction: column;
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  padding-bottom: calc(16px + env(safe-area-inset-bottom, 0px));
}

.bottom-sheet-overlay.open .bottom-sheet-drawer {
  transform: translateY(0);
}

.bottom-sheet-handle-bar {
  width: 100%;
  padding: 10px 0 6px 0;
  display: flex;
  justify-content: center;
  cursor: grab;
}

.bottom-sheet-handle {
  width: 36px;
  height: 4.5px;
  border-radius: 3px;
  background: #D0D7DE;
}

.bottom-sheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 18px 12px 18px;
  border-bottom: 1px solid var(--border-color);
}

.bottom-sheet-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.bottom-sheet-close {
  background: none;
  border: none;
  font-size: 18px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

.bottom-sheet-body {
  padding: 16px 18px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  max-height: calc(80vh - 80px);
}