/* ═══════════════════════════════════════════════════════════════
   DocuMentor v4 — css/drawer.css
   Mobile Bottom Nav Bar, Touch Drawer Sheet & Mobile Responsive Rules
   ═══════════════════════════════════════════════════════════════ */

#bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(var(--mob-nav-h) + env(safe-area-inset-bottom, 0px));
  background: rgba(18, 18, 24, 0.9);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-top: 1px solid var(--border2);
  justify-content: space-around;
  align-items: flex-start;
  padding-top: 6px;
  padding-bottom: env(safe-area-inset-bottom, 0px);
  z-index: 90;
}
.mob-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 14px;
  color: var(--text2);
  font-size: 11px;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 20px;
}
.mob-btn.active {
  color: var(--accent);
  background: var(--accent-dim);
}
.mob-btn:active {
  transform: scale(0.92);
}

#drawer-backdrop {
  position: fixed;
  inset: 0;
  background: transparent;
  pointer-events: none;
  z-index: 95;
}

#bottom-drawer {
  position: fixed;
  bottom: calc(var(--mob-nav-h) + env(safe-area-inset-bottom, 0px));
  left: 0;
  right: 0;
  background: rgba(18, 18, 24, 0.92);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-radius: 16px 16px 0 0;
  border-top: 1px solid var(--border2);
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.5);
  z-index: 96;
  max-height: 220px;
  overflow-y: auto;
  transform: translateY(100%);
  transition: transform 0.28s cubic-bezier(0.32, 0.72, 0, 1);
  touch-action: pan-y;
}
#bottom-drawer.open { transform: translateY(0); }

.drawer-grip {
  display: flex;
  justify-content: center;
  padding: 6px;
  flex-shrink: 0;
  cursor: grab;
}
.drawer-handle {
  width: 32px;
  height: 3px;
  background: var(--text2);
  opacity: 0.6;
  border-radius: 3px;
}
#drawer-inner {
  padding: 0 12px 12px;
}

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE — MOBILE MEDIA QUERY
══════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  :root { --header-h: 52px; --mob-nav-h: 58px; }

  #app-header {
    padding-left: max(12px, env(safe-area-inset-left));
    padding-right: max(12px, env(safe-area-inset-right));
    padding-top: max(4px, env(safe-area-inset-top));
  }

  .step-indicator { display: none; }
  .logo-text { font-size: 14px; }

  #page-strip { display: none; }
  #right-panel { display: none; }

  #bottom-nav { display: flex; }

  #main-content {
    padding-bottom: calc(var(--mob-nav-h) + env(safe-area-inset-bottom, 0px) + 160px);
  }

  .drop-blob { width: 260px; height: 260px; }
  #drop-zone h2 { font-size: 16px; }

  .drop-actions { flex-direction: column; width: 100%; max-width: 280px; }
  .drop-actions .btn { justify-content: center; }

  #canvas-scroll { padding: 8px 8px 170px 8px; }

  .crop-actions {
    bottom: calc(var(--mob-nav-h) + env(safe-area-inset-bottom, 0px) + 12px);
    left: 50%;
    transform: translateX(-50%);
    width: max-content;
    max-width: 92vw;
    border-radius: 24px;
    border: 1px solid var(--border2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
  }

  .desktop-sliders-group {
    display: none !important;
  }

  /* Compact Horizontal swipeable tool carousels inside bottom drawer */
  .filter-strip, .preset-grid, .tune-options-strip {
    display: flex !important;
    grid-template-columns: none !important;
    flex-direction: row !important;
    overflow-x: auto;
    gap: 8px;
    padding-bottom: 4px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
  }
  .filter-btn, .preset-btn, .tune-mode-btn, .tune-chip-btn {
    flex-shrink: 0 !important;
    scroll-snap-align: start;
    width: auto !important;
  }

  .tune-mode-btn {
    width: 56px !important;
    height: 76px !important;
    flex-direction: column !important;
    gap: 4px !important;
    padding: 6px 4px !important;
    font-size: 9px !important;
    white-space: nowrap !important;
    text-align: center !important;
  }

  .tune-icon-wrap {
    width: 26px !important;
    height: 26px !important;
    border-radius: 50% !important;
    background: var(--accent-dim) !important;
  }

  .filter-btn {
    padding: 4px !important;
    border-radius: 10px !important;
    width: 56px !important;
  }

  .filter-btn canvas {
    width: 54px !important;
    height: 54px !important;
    aspect-ratio: 1/1 !important;
    border-radius: 8px !important;
    object-fit: cover !important;
  }

  .filter-btn span, .filter-name {
    font-size: 9px !important;
    white-space: nowrap !important;
    text-overflow: ellipsis;
    overflow: hidden;
    max-width: 52px;
    font-weight: 600;
    text-align: center;
    display: block;
  }

  .panel-title {
    font-size: 10px;
    margin-bottom: 6px;
  }

  .divider {
    margin: 8px 0;
  }

  .slider-row {
    padding: 4px 0;
    gap: 6px;
    width: 100%;
    box-sizing: border-box;
  }
  .slider-label {
    width: 52px;
    font-size: 10px;
    flex-shrink: 0;
  }
  .slider {
    height: 6px;
    min-width: 0;
    flex: 1;
  }
  .slider-val {
    width: 30px;
    font-size: 10px;
    text-align: right;
    flex-shrink: 0;
  }

  /* Always-Available Mobile Page Strip Bar */
  #mobile-page-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: rgba(18, 18, 24, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    z-index: 30;
  }

  #mob-page-list {
    display: flex;
    align-items: center;
    gap: 8px;
  }

  .page-thumb.mob-thumb {
    position: relative;
    width: 44px;
    height: 58px;
    border-radius: 8px;
    border: 1px solid var(--border2);
    background: var(--bg2);
    flex-shrink: 0;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    scroll-snap-align: start;
  }

  .page-thumb.mob-thumb canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
  }

  .page-thumb.mob-thumb.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-dim), 0 2px 10px rgba(34,197,94,0.3);
    transform: scale(1.05);
  }

  .page-thumb.mob-thumb .page-thumb-num {
    position: absolute;
    bottom: 2px;
    left: 2px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    font-size: 9px;
    font-weight: 700;
    padding: 1px 4px;
    border-radius: 3px;
  }

  .mob-add-page-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    border-radius: 16px;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid rgba(34,197,94,0.3);
    font-size: 11px;
    font-weight: 600;
    flex-shrink: 0;
    cursor: pointer;
    white-space: nowrap;
  }
  .mob-add-page-btn:active {
    transform: scale(0.94);
  }
}

@media (min-width: 769px) {
  #mobile-page-bar { display: none; }
  #bottom-nav { display: none; }
  #bottom-drawer { display: none !important; }
  #drawer-backdrop { display: none !important; }
}