/* ============================================================
   INTERACTIVE DIAGRAMS — mobile layout, larger tap targets
   ============================================================ */
@media (max-width: 820px){
  #view-diagrams .dg-hero{ padding:12px 14px 10px; }
  #view-diagrams .dg-hero-row{ gap:6px; }
  #view-diagrams .dg-topic{ padding:11px 13px; font-size:14px; min-width:0; }
  #view-diagrams .dg-pill{ padding:9px 13px; font-size:12px; min-height:42px; }
  #view-diagrams .dg-pill.primary{ padding:11px 18px; font-size:13px; }

  /* Horizontal scroll toolbar — every button stays reachable */
  #view-diagrams .dg-toolbar{
    padding:8px 12px;
    gap:6px;
    overflow-x:auto;
    flex-wrap:nowrap;
    -webkit-overflow-scrolling:touch;
    scrollbar-width:none;
  }
  #view-diagrams .dg-toolbar::-webkit-scrollbar{ display:none; }
  #view-diagrams .dg-toolbar > *{ flex:none; }
  #view-diagrams .dg-ibtn{ width:42px; height:42px; }
  #view-diagrams .dg-seg button{ padding:8px 12px; font-size:12px; }

  /* Secondary button row also scrolls */
  #view-diagrams .dg-hero-secondary{
    flex-wrap:nowrap;
    overflow-x:auto;
    scrollbar-width:none;
    padding-bottom:4px;
    margin-top:10px;
  }
  #view-diagrams .dg-hero-secondary::-webkit-scrollbar{ display:none; }
  #view-diagrams .dg-hero-secondary .dg-pill{ flex:none; }
}
@media (max-width: 520px){
  #view-diagrams .dg-split{
    grid-template-columns:1fr;
    grid-template-rows:minmax(0,120px) 1fr;
  }
  #view-diagrams .dg-pane{ border-right:none; border-bottom:1px solid var(--line); }
  #view-diagrams .dg-pane-head{ padding:8px 12px; }
  #view-diagrams .dg-rows{ padding:4px 6px; }
  #view-diagrams .dg-row{ padding:8px 10px; }
  #view-diagrams .dg-row b{ font-size:12.5px; }
}

/* Recall card — thumb-friendly on mobile */
@media (max-width: 640px){
  #dgCanvas .dg-recall-card{ padding:18px 20px; width:92%; max-width:400px; }
  #dgCanvas .dg-recall-card .q{ font-size:15px; min-height:auto; }
  #dgCanvas .dg-recall-card input{ padding:12px 14px; font-size:16px; margin-bottom:12px; }
  #dgCanvas .dg-recall-card .acts button{
    padding:11px 18px; font-size:14px; min-height:44px; min-width:100px;
  }
}

/* ============================================================
   Sidebar v4 — flat list, no dropdowns, scrollable chips
   ============================================================ */

/* ---- Flex chain: guarantee the list region scrolls. Many
       patches strip min-height:0 from flex ancestors; re-assert. ---- */
.dg-pane{
  display:flex;flex-direction:column;
  min-height:0;height:100%;overflow:hidden;
}
.dg-pane > .dg-toolbar-v2{flex:0 0 auto;}
.dg-pane > #dgRows,
.dg-pane > .dg-rows{
  flex:1 1 auto;min-height:0;
  overflow-y:auto;overflow-x:hidden;
  -webkit-overflow-scrolling:touch;
  overscroll-behavior:contain;
}

/* ---- Toolbar ---- */
.dg-toolbar-v2{
  display:flex;flex-direction:column;gap:8px;
  padding:10px 12px 8px;
  border-bottom:1px solid var(--line);
  background:var(--surface);
  flex:0 0 auto;
}
.dg-search-row{
  display:flex;align-items:center;gap:8px;
  padding:7px 10px;
  background:var(--surface-2);border:1px solid var(--line);
  border-radius:9px;transition:border-color .15s,box-shadow .15s;
}
.dg-search-row:focus-within{
  border-color:color-mix(in srgb,var(--accent) 45%,var(--line));
  box-shadow:var(--ring-soft);
}
.dg-search-ico{
  width:14px;height:14px;flex:none;color:var(--muted);
  transition:color .15s;
}
.dg-search-row:focus-within .dg-search-ico{color:var(--accent);}
.dg-search{
  flex:1;min-width:0;border:0;background:transparent;box-shadow:none;
  outline:none;padding:0;font:400 13px var(--sans);color:var(--fg);
  -webkit-appearance:none;appearance:none;
}
.dg-search::-webkit-search-cancel-button{
  -webkit-appearance:none;appearance:none;width:0;height:0;
}
.dg-search::placeholder{color:var(--muted);opacity:.85;}

/* ---- Chips: single row, horizontally scrollable, no wrap ---- */
.dg-chips{
  display:flex;
  flex-wrap:nowrap;
  gap:5px;
  overflow-x:auto;
  overflow-y:hidden;
  scrollbar-width:none;
  -ms-overflow-style:none;
  -webkit-overflow-scrolling:touch;
  overscroll-behavior-x:contain;
  padding:1px 0 3px;
  /* Fade the right edge so it reads as "more to the right" */
  mask-image:linear-gradient(to right,#000 calc(100% - 24px),transparent);
  -webkit-mask-image:linear-gradient(to right,#000 calc(100% - 24px),transparent);
}
.dg-chips::-webkit-scrollbar{display:none;}
.dg-chip{
  display:inline-flex;align-items:center;gap:5px;
  flex:0 0 auto;              /* never shrink */
  padding:4px 10px;
  font:600 10.5px var(--mono);letter-spacing:.03em;
  border:1px solid var(--line);border-radius:99px;
  background:transparent;color:var(--soft);cursor:pointer;
  white-space:nowrap;transition:background .12s,color .12s,border-color .12s;
}
.dg-chip:hover{color:var(--fg);border-color:var(--line2);}
.dg-chip.on{
  background:var(--accent);color:var(--accent-ink);
  border-color:var(--accent);
}
.dg-chip-n{
  font:600 9px var(--mono);
  background:color-mix(in srgb,currentColor 14%,transparent);
  border-radius:99px;padding:0 5px;min-width:14px;text-align:center;
}
.dg-chip.on .dg-chip-n{background:color-mix(in srgb,#000 18%,transparent);}

/* ---- Section header — a static divider, not a button ---- */
.dg-section{
  display:flex;align-items:center;gap:8px;
  padding:14px 12px 6px;
  position:sticky;top:0;z-index:2;
  background:var(--surface);
  border-bottom:1px solid var(--line);
  pointer-events:none;         /* not clickable */
}
.dg-section-title{
  flex:1;min-width:0;
  font:600 10px var(--mono);letter-spacing:.14em;
  text-transform:uppercase;color:var(--dim);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.dg-section-count{
  font:600 10px var(--mono);color:var(--soft);
  background:var(--surface-2);border:1px solid var(--line);
  border-radius:99px;padding:1px 7px;flex:none;
}

/* ---- Row: title + delete. No tag, no date, no layout shifts. ---- */
.dg-row{
  position:relative;
  display:flex;align-items:center;
  padding:10px 40px 10px 12px;   /* space reserved for the × */
  border-radius:9px;
  cursor:pointer;
  border:1px solid transparent;
  transition:background .12s,border-color .12s;
  /* Kill the flicker: no opacity transition on children. */
}
.dg-row:hover{background:var(--panel2);}
.dg-row:focus-visible{
  outline:none;
  border-color:color-mix(in srgb,var(--accent) 45%,var(--line));
  box-shadow:var(--ring-soft);
}
.dg-row.on{
  background:color-mix(in srgb,var(--accent) 10%,transparent);
  border-color:color-mix(in srgb,var(--accent) 32%,transparent);
}
.dg-row-title{
  display:block;min-width:0;
  font:600 13.5px var(--sans);color:var(--fg);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
/* Delete button: always in the layout, always clickable, only
   colored on its own hover — no opacity transition, no flicker. */
.dg-row .dg-del{
  position:absolute;right:8px;top:50%;
  width:24px;height:24px;
  transform:translateY(-50%);
  border:1px solid transparent;background:transparent;
  color:transparent;                /* invisible until hover */
  cursor:pointer;
  font:600 14px/1 var(--sans);
  border-radius:6px;
  display:grid;place-items:center;padding:0;
}
.dg-row:hover .dg-del,
.dg-row:focus-within .dg-del{
  color:var(--muted);
}
.dg-row .dg-del:hover{
  color:#fff;background:var(--err);border-color:var(--err);
}

/* ---- Empty state ---- */
.dg-empty{
  display:flex;flex-direction:column;gap:6px;
  padding:36px 22px;text-align:center;
}
.dg-empty b{font:600 13.5px var(--sans);color:var(--fg);}
.dg-empty span{font:12.5px/1.55 var(--sans);color:var(--soft);}
.dg-empty kbd{
  font:600 10px var(--mono);
  padding:1px 6px;border-radius:4px;
  border:1px solid var(--line);background:var(--surface-2);
  color:var(--fg);
}