/* two-colour-counters.css — Two Colour Counters manipulative (prefix: tc-) */

:root {
  --tc-pos-colour:  #facc15;
  --tc-neg-colour:  #ef4444;
  --tc-pos-stroke:  #a16207;
  --tc-neg-stroke:  #991b1b;
  --tc-pos-sign:    #0f172a;
  --tc-neg-sign:    #ffffff;
  --tc-counter-size: 30px;
  --tc-counter-diameter: calc(var(--tc-counter-size) * 2);
  --tc-paired-opacity: 0.45;
  /* Linked zero pairs with signs hidden: keep chip colours, mute with opacity */
  --tc-paired-colour-opacity: 0.5;
  --tc-paired-offset: calc(var(--tc-counter-size) * 0.5);
  --tc-paired-fill:   #d1d5db;
  --tc-paired-stroke: #6b7280;
  --tc-paired-sign:   #374151;
  --tc-selection-ring: var(--sm-indigo);
  --tc-grid-line: var(--sm-border);
  --tc-radius-panel:   10px;
  --tc-radius-btn:     8px;
  --tc-radius-menu:    6px;
  --tc-shadow-panel:   0 2px 6px rgba(15, 23, 42, 0.08);
  --tc-shadow-counter: 0 1px 2px rgba(15, 23, 42, 0.06);
  --tc-shadow-menu:    0 6px 18px rgba(15, 23, 42, 0.18);
  --tc-transition:     0.15s ease;
}

[data-theme="dark"] {
  --tc-shadow-panel:   0 2px 8px rgba(0, 0, 0, 0.35);
  --tc-shadow-counter: 0 1px 3px rgba(0, 0, 0, 0.45);
  --tc-shadow-menu:    0 8px 22px rgba(0, 0, 0, 0.5);
  --tc-paired-fill:   #4b5563;
  --tc-paired-stroke: #1f2937;
  --tc-paired-sign:   #d1d5db;
}

/* Narrower sidebar (~2/3 of framework default 260px) for more canvas space */
#app .sm-layout {
  --sm-sidebar-width: calc(260px * 2 / 3);
}

.tc-sidebar {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 10px 14px;
  background: var(--sm-surface);
  border-right: 1px solid var(--sm-border);
  overflow-y: auto;
  min-height: 0;
}

.tc-sidebar .sm-sidebar-heading {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--sm-text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 0 0 4px 0;
}

.tc-sep {
  height: 1px;
  background: var(--sm-border);
  border: none;
  margin: 4px 0;
}

.tc-sidebar-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tc-sidebar-group.tc-sidebar-display {
  gap: 0;
}

.tc-sidebar-display .sm-control {
  margin: 0;
}

/* Compact toggles in the rail (Display + show-signs) */
.tc-sidebar .sm-toggle-wrap {
  min-height: 32px;
  padding: 2px 0;
}

.tc-piles {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 2px;
}

.tc-pile {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  width: 100%;
  height: 76px;
  padding: 6px;
  background: var(--sm-surface);
  border: 1px solid var(--sm-border);
  border-radius: var(--tc-radius-panel);
  cursor: grab;
  transition: transform var(--tc-transition),
              border-color var(--tc-transition),
              box-shadow var(--tc-transition);
  box-shadow: var(--tc-shadow-counter);
  -webkit-user-drag: none;
  user-select: none;
  touch-action: none;
  font: inherit;
}

.tc-pile:hover:not(:disabled) {
  border-color: var(--sm-indigo);
  transform: translateY(-1px);
  box-shadow: var(--tc-shadow-panel);
}

.tc-pile:focus-visible {
  outline: 3px solid var(--sm-indigo-light);
  outline-offset: 2px;
}

.tc-pile:active:not(:disabled) {
  cursor: grabbing;
  transform: translateY(0);
}

.tc-pile:disabled,
.tc-pile-locked {
  opacity: 0.45;
  cursor: not-allowed;
}

.tc-pile-icon {
  position: relative;
  width: 52px;
  height: 52px;
  flex-shrink: 0;
}

.tc-pile-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.tc-ops-card[hidden] {
  display: none;
}

.tc-ops-card {
  display: flex;
  gap: 0;
  background: var(--sm-surface);
  border: 1px solid var(--sm-border);
  border-radius: var(--tc-radius-panel);
  box-shadow: var(--tc-shadow-counter);
  overflow: hidden;
  margin-bottom: 2px;
}

.tc-op-pile {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 76px;
  padding: 6px;
  background: transparent;
  border: none;
  cursor: grab;
  font: inherit;
  color: var(--sm-text);
  -webkit-user-drag: none;
  user-select: none;
  touch-action: none;
  transition: background var(--tc-transition);
}

.tc-op-pile + .tc-op-pile {
  border-left: 1px solid var(--sm-border);
}

.tc-op-pile:hover:not(:disabled) {
  background: var(--sm-indigo-light);
}

.tc-op-pile:focus-visible {
  outline: 3px solid var(--sm-indigo-light);
  outline-offset: -3px;
}

.tc-op-pile:active:not(:disabled) {
  cursor: grabbing;
}

.tc-op-pile:disabled,
.tc-op-pile.tc-pile-locked {
  opacity: 0.45;
  cursor: not-allowed;
}

.tc-op-glyph {
  font-size: 44px;
  line-height: 1;
  font-weight: 800;
}

.tc-operator {
  cursor: grab;
}

.tc-operator:active {
  cursor: grabbing;
}

.tc-operator-hit {
  fill: var(--sm-canvas-bg);
  fill-opacity: 0.01;
  stroke: none;
  pointer-events: all;
}

.tc-operator-sign {
  pointer-events: none;
  user-select: none;
}

.tc-drag-preview .tc-op-drag-preview-strokes {
  stroke: var(--sm-text);
  stroke-width: 5;
  stroke-linecap: round;
}

.tc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--sm-border);
  border-radius: var(--tc-radius-btn);
  background: var(--sm-surface);
  color: var(--sm-text);
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--tc-transition),
              border-color var(--tc-transition),
              color var(--tc-transition);
}

.tc-sidebar .tc-btn {
  min-height: 36px;
  padding: 5px 10px;
}

.tc-btn:hover:not(:disabled) {
  background: var(--sm-indigo-light);
  border-color: var(--sm-indigo);
  color: var(--sm-indigo);
}

.tc-btn:focus-visible {
  outline: 3px solid var(--sm-indigo-light);
  outline-offset: 2px;
}

.tc-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.tc-btn-danger { color: var(--sm-incorrect); }
.tc-btn-danger:hover:not(:disabled) {
  background: var(--sm-incorrect-bg);
  border-color: var(--sm-incorrect);
  color: var(--sm-incorrect);
}

.tc-btn-settings {
  margin-top: auto;
  justify-content: flex-start;
  gap: 8px;
}

.tc-actions,
.tc-utils {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tc-main {
  position: relative;
  overflow: hidden;
  background: var(--sm-canvas-bg);
  min-height: 0;
}

.tc-canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 200px;
  background: var(--sm-canvas-bg);
  cursor: default;
  touch-action: none;
  outline: none;
}

.tc-canvas:focus-visible {
  box-shadow: inset 0 0 0 3px var(--sm-indigo-light);
}

.tc-grid line {
  stroke: var(--tc-grid-line);
  stroke-width: 1;
  opacity: 0.5;
  pointer-events: none;
}

[data-theme="dark"] .tc-grid line {
  opacity: 0.35;
  stroke: var(--sm-text-muted);
}

.tc-rubberband {
  fill: var(--sm-indigo);
  fill-opacity: 0.08;
  stroke: var(--sm-indigo);
  stroke-width: 1;
  stroke-dasharray: 4 4;
  pointer-events: none;
}
.tc-rubberband[aria-hidden="true"] { display: none; }

.tc-counter {
  cursor: grab;
  filter: drop-shadow(var(--tc-shadow-counter));
  transition: filter var(--tc-transition),
              opacity var(--tc-transition);
}

.tc-counter:hover {
  filter: drop-shadow(0 2px 5px rgba(15, 23, 42, 0.14));
}

.tc-counter:active {
  cursor: grabbing;
}

[data-theme="dark"] .tc-counter:hover {
  filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.35));
}

.tc-counter-circle {
  stroke-width: 2;
  transition: none;
}

.tc-counter-ring {
  transition: none;
}

.tc-counter-sign {
  pointer-events: none;
  user-select: none;
}

.tc-counter-paired {
  opacity: var(--tc-paired-opacity);
  filter: none;
}

.tc-counter-paired .tc-counter-circle {
  fill: var(--tc-paired-fill);
  stroke: var(--tc-paired-stroke);
}

.tc-counter-paired .tc-counter-sign {
  stroke: var(--tc-paired-sign);
}

/* Overlap mode + signs off: paired counters stay yellow/red but subdued */
.tc-counter-paired-colour {
  opacity: var(--tc-paired-colour-opacity);
  filter: none;
}

.tc-counter-selected .tc-counter-ring,
.tc-counter-selected .tc-operator-ring {
  fill: none;
  stroke: var(--tc-selection-ring);
  stroke-width: 3;
  stroke-dasharray: 0;
  pointer-events: none;
}

.tc-value-panel {
  position: absolute;
  top: 56px;
  right: 16px;
  min-width: 180px;
  max-width: min(92vw, 360px);
  padding: 10px 40px 12px 14px;
  background: var(--sm-surface-raised);
  border: 1px solid var(--sm-border);
  border-radius: var(--tc-radius-panel);
  box-shadow: var(--tc-shadow-panel);
  pointer-events: none;
  z-index: 5;
  font: inherit;
  transition: min-width var(--tc-transition), padding var(--tc-transition);
}

.tc-value-panel-body {
  pointer-events: none;
}

.tc-value-panel-zoom {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 36px;
  height: 36px;
  margin: 0;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--tc-radius-btn);
  background: transparent;
  color: var(--sm-text-muted);
  cursor: pointer;
  pointer-events: auto;
  transition: background var(--tc-transition), color var(--tc-transition);
}

.tc-value-panel-zoom:hover {
  background: var(--sm-indigo-light);
  color: var(--sm-indigo);
}

.tc-value-panel-zoom:focus-visible {
  outline: 2px solid var(--sm-indigo);
  outline-offset: 1px;
}

.tc-value-panel-zoom-svg {
  display: block;
  pointer-events: none;
}

.tc-value-panel-zoom-svg--collapse {
  display: none;
}

.tc-value-panel--zoomed .tc-value-panel-zoom-svg--expand {
  display: none;
}

.tc-value-panel--zoomed .tc-value-panel-zoom-svg--collapse {
  display: block;
}

.tc-value-panel--zoomed {
  min-width: 280px;
  max-width: min(94vw, 520px);
  padding: 14px 44px 18px 18px;
}

.tc-value-panel--zoomed .tc-value-row {
  font-size: 2rem;
}

.tc-value-panel--zoomed .tc-count-row {
  font-size: 1.3125rem;
  margin-top: 10px;
}

.tc-value-panel--zoomed .tc-equation-row {
  font-size: 1.1875rem;
  margin-top: 12px;
  padding-top: 12px;
}

.tc-value-row {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--sm-text);
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
  transition: font-size var(--tc-transition);
}

.tc-value-num {
  font-weight: 800;
  margin-left: 4px;
}

.tc-count-row {
  display: flex;
  gap: 14px;
  margin-top: 6px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--sm-text-muted);
  font-variant-numeric: tabular-nums;
  transition: font-size var(--tc-transition), margin-top var(--tc-transition);
}

.tc-count-pos { color: var(--tc-pos-stroke); }
.tc-count-neg { color: var(--tc-neg-stroke); }

.tc-equation-row {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--sm-border);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--sm-text);
  font-variant-numeric: tabular-nums;
  transition: font-size var(--tc-transition), margin-top var(--tc-transition), padding-top var(--tc-transition);
}

.tc-arrow-pad {
  display: grid;
  position: absolute;
  bottom: 86px;
  right: 16px;
  grid-template-columns: repeat(3, 48px);
  grid-template-rows:    repeat(3, 48px);
  gap: 4px;
  padding: 8px;
  background: var(--sm-surface-raised);
  border: 1px solid var(--sm-border);
  border-radius: var(--tc-radius-panel);
  box-shadow: var(--tc-shadow-panel);
  z-index: 5;
}

.tc-arrow,
.tc-arrow-mode {
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--tc-radius-btn);
  color: var(--sm-text);
  cursor: pointer;
  font: inherit;
  transition: background var(--tc-transition);
}

.tc-arrow:hover,
.tc-arrow-mode:hover { background: var(--sm-indigo-light); color: var(--sm-indigo); }
.tc-arrow:focus-visible,
.tc-arrow-mode:focus-visible {
  outline: 2px solid var(--sm-indigo);
  outline-offset: 1px;
}

.tc-arrow-up    { grid-column: 2; grid-row: 1; }
.tc-arrow-left  { grid-column: 1; grid-row: 2; }
.tc-arrow-mode  { grid-column: 2; grid-row: 2; }
.tc-arrow-right { grid-column: 3; grid-row: 2; }
.tc-arrow-down  { grid-column: 2; grid-row: 3; }

.tc-arrow::before {
  content: '';
  display: block;
  width: 0;
  height: 0;
  border-style: solid;
}
.tc-arrow-up::before    { border-width: 0 7px 10px 7px; border-color: transparent transparent currentColor transparent; }
.tc-arrow-down::before  { border-width: 10px 7px 0 7px; border-color: currentColor transparent transparent transparent; }
.tc-arrow-left::before  { border-width: 7px 10px 7px 0; border-color: transparent currentColor transparent transparent; }
.tc-arrow-right::before { border-width: 7px 0 7px 10px; border-color: transparent transparent transparent currentColor; }

.tc-arrow-mode-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.tc-arrow-pad[data-mode="duplicate"] .tc-arrow-mode { color: var(--sm-indigo); }
.tc-arrow-pad[data-mode="nudge"]     .tc-arrow-mode { color: var(--sm-highlight); }

.tc-arrow-pad.tc-no-export-hidden { visibility: hidden; }

.tc-arrow-pad.tc-arrow-pad-hidden { display: none; }

.tc-drag-preview {
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 100;
  width: var(--tc-counter-diameter);
  height: var(--tc-counter-diameter);
  opacity: 0.85;
  transform: translate(-9999px, -9999px);
  transition: none;
}

.tc-drag-preview.tc-no-export-hidden { visibility: hidden; }

.tc-value-panel-zoom.tc-no-export-hidden { visibility: hidden; }

.tc-context-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  min-width: 160px;
  padding: 6px;
  background: var(--sm-surface-raised);
  border: 1px solid var(--sm-border);
  border-radius: var(--tc-radius-panel);
  box-shadow: var(--tc-shadow-menu);
  z-index: 1000;
  font: inherit;
}

.tc-context-menu[aria-hidden="false"] { display: block; }

.tc-menu-item {
  display: block;
  width: 100%;
  padding: 8px 12px;
  background: transparent;
  border: none;
  border-radius: var(--tc-radius-menu);
  color: var(--sm-text);
  text-align: left;
  font: inherit;
  cursor: pointer;
  transition: background var(--tc-transition), color var(--tc-transition);
}

.tc-menu-item:hover:not(:disabled),
.tc-menu-item:focus-visible {
  background: var(--sm-indigo-light);
  color: var(--sm-indigo);
  outline: none;
}

.tc-menu-item[hidden] { display: none; }

.tc-menu-item-danger { color: var(--sm-incorrect); }
.tc-menu-item-danger:hover:not(:disabled),
.tc-menu-item-danger:focus-visible {
  background: var(--sm-incorrect-bg);
  color: var(--sm-incorrect);
}

.tc-menu-sep {
  height: 1px;
  margin: 4px 2px;
  background: var(--sm-border);
  border: none;
}

.tc-settings-modal {
  max-width: 640px;
}

.tc-settings-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 24px;
}

@media (min-width: 720px) {
  .tc-settings-modal {
    max-width: 720px;
  }
  .tc-settings-body {
    grid-template-columns: 1fr 1fr;
  }
  .tc-settings-section--wide {
    grid-column: 1 / -1;
  }
}

.tc-settings-section {
  padding: 14px 0;
  border-bottom: 1px solid var(--sm-border);
  min-width: 0;
}
.tc-settings-section:last-child { border-bottom: none; }

@media (min-width: 720px) {
  .tc-settings-section {
    border-bottom: none;
  }
  .tc-settings-section--wide {
    border-bottom: 1px solid var(--sm-border);
  }
}

.tc-settings-section-title {
  margin: 0 0 12px 0;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sm-text-muted);
}

.tc-settings-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}
.tc-settings-row:last-child { margin-bottom: 0; }

.tc-settings-row-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--sm-text);
}

.tc-settings-hint {
  margin: -4px 0 14px 0;
  font-size: 0.8125rem;
  color: var(--sm-text-muted);
  line-height: 1.35;
}

/* ── Colour preset swatches ─────────────────────────────── */

.tc-preset-swatches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 8px;
}

.tc-preset-swatch {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  padding: 6px;
  background: var(--sm-surface);
  border: 2px solid transparent;
  border-radius: var(--tc-radius-btn);
  cursor: pointer;
  font: inherit;
  color: var(--sm-text);
  text-align: center;
  transition: border-color var(--tc-transition), background var(--tc-transition);
}

.tc-preset-swatch:hover {
  background: var(--sm-indigo-light);
}

.tc-preset-swatch:focus-visible {
  outline: none;
  border-color: var(--sm-indigo);
  box-shadow: 0 0 0 2px var(--sm-indigo-light);
}

.tc-preset-swatch[aria-checked="true"] {
  border-color: var(--sm-indigo);
  background: var(--sm-indigo-light);
}

.tc-preset-swatch-preview {
  display: flex;
  height: 36px;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--sm-border);
}

.tc-preset-swatch-half {
  flex: 1 1 50%;
  display: block;
}

.tc-preset-swatch-label {
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.2;
}

/* ── Custom colour reveal row ───────────────────────────── */

.tc-settings-custom {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 16px;
  padding: 10px 12px;
  background: var(--sm-surface);
  border: 1px solid var(--sm-border);
  border-radius: var(--tc-radius-btn);
}

.tc-settings-custom[hidden] { display: none; }

.tc-settings-custom-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
}

.tc-settings-custom-row label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--sm-text);
}

.tc-settings-custom-row input[type="color"] {
  width: 44px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--sm-border);
  border-radius: var(--tc-radius-btn);
  background: var(--sm-surface);
  cursor: pointer;
}

/* ── Counter size row + preview dot ─────────────────────── */

.tc-settings-size-controls {
  display: flex;
  align-items: center;
  gap: 14px;
}

.tc-settings-size-slider {
  flex: 1 1 auto;
  min-width: 0;
}

.tc-size-preview {
  flex: 0 0 auto;
  display: inline-block;
  min-width: 24px;
  min-height: 24px;
  max-width: 40px;
  max-height: 40px;
  border-radius: 50%;
  background: var(--tc-pos-colour);
  border: 2px solid var(--tc-pos-stroke);
  transition: width 0.1s ease, height 0.1s ease;
}

.tc-shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.tc-shortcuts-table td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--sm-border);
  vertical-align: top;
}
.tc-shortcuts-table td:first-child {
  white-space: nowrap;
  color: var(--sm-text-muted);
}
.tc-shortcuts-table kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--sm-border);
  border-radius: 4px;
  background: var(--sm-surface);
  font-family: inherit;
  font-size: 0.8125rem;
  color: var(--sm-text);
}

@media (max-width: 640px) {
  .tc-value-panel {
    min-width: 140px;
    top: 52px;
    right: 10px;
    padding: 8px 38px 10px 12px;
  }

  .tc-value-panel--zoomed {
    min-width: 230px;
  }

  .tc-value-panel--zoomed .tc-value-row {
    font-size: 1.625rem;
  }

  .tc-value-panel--zoomed .tc-count-row {
    font-size: 1.125rem;
  }

  .tc-value-panel--zoomed .tc-equation-row {
    font-size: 1.0625rem;
  }
  .tc-pile { height: 70px; }
  .tc-pile-icon { width: 44px; height: 44px; }
  .tc-op-pile { height: 70px; }
  .tc-op-glyph { font-size: 36px; }
}

@media (max-width: 380px) {
  .tc-equation-row { display: none !important; }
  .tc-pile { height: 60px; }
  .tc-pile-icon { width: 40px; height: 40px; }
  .tc-op-pile { height: 60px; }
  .tc-op-glyph { font-size: 32px; }
}