/* ─── SIDEBAR ─── */
.lpanel {
  width: var(--lpanel-width, 256px);
  min-width: var(--lpanel-width, 256px);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  overflow: visible;
  display: flex;
  flex-direction: column;
  transition: width var(--transition-base), min-width var(--transition-base);
  position: relative;
  z-index: 10;
}

.lpanel.hidden {
  width: 0;
  min-width: 0;
  overflow: hidden;
}

.sec {
  border-bottom: 1px solid var(--border);
  padding: 12px 14px;
}

.lpanel .sec.lp-collapsible {
  padding: 0;
  border-bottom: 1px solid var(--border);
}

.lpanel .sec.lp-collapsible:last-child {
  flex: initial;
}

#lp-transitions {
  flex: 1;
  min-height: 0;
}

#lp-transitions .lp-section-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

#lp-transitions.collapsed {
  flex: initial;
}

.lpanel .lp-section-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px 7px;
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.lpanel .lp-section-header:hover {
  background: var(--surface);
}

.lpanel .lp-section-header:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--focus-ring);
}

.lpanel .lp-section-header .sec-lbl {
  margin-bottom: 0;
  flex: 1;
  font-size: .66rem;
  letter-spacing: .1em;
}

.lp-section-count {
  min-width: 18px;
  height: 18px;
  padding: 0 6px;
  border-radius: 999px;
  border: 1px solid var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: .64rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  flex-shrink: 0;
}

.lp-toggle-arrow {
  width: 13px;
  height: 13px;
  fill: none;
  stroke: var(--text3);
  stroke-width: 2;
  flex-shrink: 0;
  transition: transform var(--transition-fast), stroke var(--transition-fast);
}

.lp-collapsible.collapsed .lp-toggle-arrow {
  transform: rotate(-90deg);
}

.lpanel .lp-section-body {
  padding: 3px 14px 12px;
}

.lp-collapsible.collapsed .lp-section-body {
  display: none;
}

.lp-collapsible .row {
  margin-bottom: 8px;
}

.lp-collapsible .chips {
  min-height: 22px;
}

.sec:last-child {
  border-bottom: none;
  flex: 1;
}

.sec-lbl {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.sec-lbl::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.row {
  display: flex;
  gap: 5px;
  margin-bottom: 6px;
}

.inp {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text);
  font-family: var(--mono);
  font-size: .78rem;
  padding: 5px 9px;
  border-radius: 6px;
  outline: none;
  transition: border-color .15s;
  min-width: 0;
}

.inp:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--focus-ring);
}

.inp::placeholder {
  color: var(--text3);
}

.sel {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text);
  font-family: var(--mono);
  font-size: .78rem;
  padding: 5px 9px;
  border-radius: 6px;
  outline: none;
  cursor: pointer;
}

.ibtn {
  width: 30px;
  height: 30px;
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text2);
  border-radius: 6px;
  cursor: pointer;
  font-size: .9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.ibtn:hover {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-height: 24px;
}

.chip {
  font-family: var(--mono);
  font-size: .7rem;
  padding: 2px 8px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 20px;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 4px;
}

.chip .x {
  cursor: pointer;
  color: var(--text3);
  font-size: .75rem;
  transition: color .12s;
}

.chip .x:hover {
  color: var(--red);
}

.slist {
  display: flex;
  flex-direction: column;
  gap: 3px;
  max-height: 150px;
  overflow-y: auto;
}

.si {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 9px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--mono);
  font-size: .72rem;
  cursor: pointer;
  transition: all .12s;
  user-select: none;
}

.si:hover {
  border-color: var(--border2);
}

.si .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 5px var(--gold-border);
  display: none;
  margin-left: auto;
}

.si.acc .dot {
  display: block;
}

.si.start::before {
  content: '→';
  color: var(--green);
  font-size: .65rem;
}

.tlist {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 95%;
  overflow-y: auto;
}

#lp-transitions .tlist {
  flex: 1;
  max-height: none;
}

.ti {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-family: var(--mono);
  font-size: .67rem;
  color: var(--text2);
}

.ti .arr {
  color: var(--accent);
}

.ti .dx {
  margin-left: auto;
  cursor: pointer;
  color: var(--text3);
}

.ti .dx:hover {
  color: var(--red);
}

.empty-msg {
  font-family: var(--mono);
  font-size: .65rem;
  color: var(--text3);
  font-style: italic;
  text-align: center;
  padding: 8px 0;
}

.panel-resizer {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 10px;
  z-index: 140;
  cursor: col-resize;
  touch-action: none;
}

.panel-resizer::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2px;
  height: 54px;
  border-radius: 2px;
  background: var(--border2);
  opacity: 0;
  transition: opacity var(--transition-fast), background var(--transition-fast);
}

.panel-resizer:hover::before,
.panel-resizer.active::before {
  opacity: 1;
  background: var(--accent);
}

.panel-resizer-right {
  right: -5px;
}

.panel-resizer-left {
  left: -5px;
}

.lpanel.unpinned .panel-resizer,
.rpanel.unpinned .panel-resizer {
  opacity: 0;
  pointer-events: none;
}

body.panel-resizing,
body.panel-resizing * {
  user-select: none !important;
  cursor: col-resize !important;
}


/* ─── SIDEBAR COLLAPSE / PINNING ─── */
.lpanel.unpinned {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  z-index: 100;
  box-shadow: var(--panel-shadow-left);
  transition-delay: 0.15s;
}

.lpanel.unpinned:not(:hover) {
  width: 0;
  min-width: 0;
  transition-delay: 0.4s;
}

.lpanel.unpinned .lpanel-content,
.lpanel.unpinned .panel-footer {
  transition: opacity var(--transition-base), visibility var(--transition-base);
  transition-delay: 0.15s;
}

.lpanel.unpinned:not(:hover) .lpanel-content,
.lpanel.unpinned:not(:hover) .panel-footer {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition-delay: 0.4s;
}

.lpanel.unpinned::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  right: -15px;
  width: 15px;
  cursor: default;
  z-index: 101;
}

.panel-footer {
  padding: 8px 14px;
  display: flex;
  justify-content: flex-end;
  border-top: 1px solid var(--border);
  background: var(--bg2);
  flex-shrink: 0;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.pin-btn {
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  color: var(--text3);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.pin-btn:hover {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border2);
}

.pin-btn svg {
  transition: transform 0.2s ease;
}

.lpanel.unpinned .pin-btn svg {
  transform: rotate(-45deg);
}

.lpanel-content {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.lpanel-search-inp {
  width: 100%;
  box-sizing: border-box;
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text);
  font-family: var(--mono);
  font-size: .72rem;
  padding: 5px 8px;
  border-radius: 6px;
  outline: none;
  margin-bottom: 5px;
  transition: border-color var(--transition-fast);
}

.lpanel-search-inp:focus {
  border-color: var(--accent);
}

/* ─── RPANEL COLLAPSIBLE SECTIONS ─── */
.rp-collapsible {
  border-bottom: 1px solid var(--border);
}

.rp-section-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 14px 8px 14px;
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.rp-section-header:hover {
  background: var(--surface);
}

.rp-section-title {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text3);
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.rp-section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
  margin-left: 6px;
}

.rp-toggle-arrow {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: var(--text3);
  stroke-width: 2;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.rp-collapsible.collapsed .rp-toggle-arrow {
  transform: rotate(-90deg);
}

.rp-section-body {
  padding: 4px 14px 14px;
}

/* ─── ALGO SEARCH ─── */
.algo-search-wrap {
  padding: 10px;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 5;
  flex-shrink: 0;
}

.algo-search-inp {
  width: 100%;
  box-sizing: border-box;
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text);
  font-family: var(--mono);
  font-size: .72rem;
  padding: 5px 8px;
  border-radius: 6px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.algo-search-inp:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--focus-ring);
}

.algo-search-inp::placeholder {
  color: var(--text3);
}

/* ─── GRAMMAR GROUP LABELS ─── */
.gram-group-label {
  font-family: var(--mono);
  font-size: .65rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--text3);
  padding: 8px 0 4px;
  border-top: 1px solid var(--border);
  margin-top: 6px;
}

.gram-group-label:first-child {
  border-top: none;
  margin-top: 0;
}

@media (max-width: 900px) {
  .lpanel {
    width: 100%;
    min-width: 0;
    max-height: 30vh;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .lpanel.hidden {
    display: none;
  }

  .lpanel.unpinned,
  .lpanel.unpinned:not(:hover) {
    position: relative;
    left: auto;
    top: auto;
    height: auto;
    width: 100%;
    min-width: 0;
    box-shadow: none;
    transition-delay: 0s;
  }

  .lpanel.unpinned::after {
    display: none;
  }

  .lpanel.unpinned .lpanel-content,
  .lpanel.unpinned .panel-footer,
  .lpanel.unpinned:not(:hover) .lpanel-content,
  .lpanel.unpinned:not(:hover) .panel-footer {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .panel-footer {
    padding: 8px 10px;
  }
}