/* === Mid-Zone: Unified Measurements List === */
.mid-zone {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

/* --- Zone Header (toggle expand/collapse) --- */
.zone-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px var(--space-3) 4px;
  cursor: pointer;
  flex-shrink: 0;
  -webkit-user-select: none;
  user-select: none;
}

.zone-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.zone-chevron {
  font-size: 10px;
  color: var(--color-text-muted);
  transition: transform 0.25s;
  display: inline-block;
}

.zone-title {
  font-size: 10px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.zone-badge {
  min-width: 18px;
  height: 18px;
  border-radius: 9px;
  background: var(--color-save);
  color: #fff;
  font-size: 9px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
}

.zone-actions { display: flex; gap: 8px; }
.zone-action-btn {
  padding: 3px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: transparent;
  color: var(--color-accent);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  cursor: pointer;
}
.zone-action-btn:active { background: rgba(65,135,255,0.1); }

/* --- List Area --- */
.list-area {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0 var(--space-3);
}

/* --- List Rows --- */
.list-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  margin-bottom: 4px;
  cursor: pointer;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid transparent;
  touch-action: pan-y;
}

.list-row:active { background: rgba(65,135,255,0.08); }

.list-row.saved {
  border-left: 3px solid var(--color-save);
}

/* Unsaved rows are fainter */
.list-row:not(.saved) { opacity: 0.65; }

.row-pin {
  font-size: 12px;
  flex-shrink: 0;
  width: 16px;
  text-align: center;
}

.row-body {
  flex: 1;
  min-width: 0;
}

.row-label {
  font-size: 11px;
  color: var(--color-imperial);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 1px;
}

.row-expr {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.row-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 16px;
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
}

.list-row.saved .row-val { font-size: 18px; }

/* --- "More" indicator --- */
.list-more {
  text-align: center;
  font-size: 10px;
  color: var(--color-text-muted);
  opacity: 0.5;
  padding: 6px 0;
}

/* --- Swipe hint (expanded) --- */
.swipe-hint {
  text-align: center;
  font-size: 9px;
  color: var(--color-text-muted);
  opacity: 0.4;
  padding: 8px 0;
  letter-spacing: 0.3px;
}

/* --- Back to Calculator button (sticky) --- */
.back-btn {
  margin: 8px var(--space-3) 8px;
  padding: 12px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-lg);
  background: rgba(65,135,255,0.08);
  color: var(--color-accent);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
  flex-shrink: 0;
}
.back-btn:active { background: rgba(65,135,255,0.2); }
.back-btn[hidden] { display: none; }

/* --- Empty State --- */
.empty-state {
  flex: 1;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4);
  min-height: 80px;
}
.empty-icon { opacity: 0.2; }
.empty-icon svg { width: 32px; height: 32px; stroke: var(--color-text-muted); fill: none; stroke-width: 1.5; stroke-linecap: round; }
.empty-title { font-size: var(--text-sm); color: var(--color-text-muted); opacity: 0.5; font-weight: 600; }
.empty-example { font-size: var(--text-xs); color: var(--color-text-muted); opacity: 0.3; text-align: center; line-height: 1.6; }

/* --- Pin Widget --- */
.pin-widget {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  overflow: hidden;
  flex-shrink: 0;
  cursor: pointer;
}

.pin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 14px;
}
.pin-title { font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 1px; color: var(--color-text-muted); font-weight: 600; }
.pin-toggle { display: flex; align-items: center; gap: 6px; }
.pin-pin { color: var(--color-accent); font-size: 10px; opacity: 0.5; }
.pin-chevron { color: var(--color-text-muted); font-size: var(--text-xs); transition: transform 0.25s; }
.pin-widget.expanded .pin-chevron { transform: rotate(180deg); }

.pin-compact { display: flex; gap: 10px; padding: 0 14px 9px; flex-wrap: wrap; }
.pin-widget.expanded .pin-compact { display: none; }
.pc-item { display: flex; align-items: baseline; gap: 4px; }
.pc-label { font-size: var(--text-xs); color: var(--color-text-muted); }
.pc-val { font-size: var(--text-base); font-weight: 700; color: var(--color-accent); }
.pc-val.imperial { color: var(--color-imperial); }

.pin-expanded { display: none; padding: var(--space-1) 14px var(--space-4); }
.pin-widget.expanded .pin-expanded { display: block; }
.pe-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 24px; }
.pe-label { font-size: var(--text-xs); color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 2px; }
.pe-val { font-size: 28px; font-weight: 700; color: var(--color-accent); line-height: 1.1; }
.pe-val.imperial { color: var(--color-imperial); }

/* Toast */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  padding: var(--space-2) var(--space-4);
  border-radius: 20px;
  background: var(--color-bg-raised);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 600;
  z-index: 200;
  white-space: nowrap;
}
.toast[hidden] { display: none; }

@media (prefers-reduced-motion: reduce) {
  .zone-chevron { transition: none; }
  .pin-chevron { transition: none; }
}