/* ============================================================
   PY INTERNALS — MEMORY VISUALIZER CSS
   Stack frame, heap objects, reference arrows, animations
   ============================================================ */

/* ── Memory Layout ────────────────────────────────────────── */
.mem-canvas {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 360px;
  overflow: hidden;
  font-family: var(--font-mono);
}

/* ── Sections ─────────────────────────────────────────────── */
.mem-section-label {
  font-size: var(--fs-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--clr-text-3);
  margin-bottom: var(--sp-3);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.mem-section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--clr-border);
}

/* ── Stack Frame ──────────────────────────────────────────── */
.mem-stack {
  margin-bottom: var(--sp-4);
}

.mem-frame {
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--sp-2);
}

.mem-frame__header {
  background: var(--clr-surface-2);
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--clr-text-2);
  border-bottom: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.mem-frame__scope-badge {
  font-size: 10px;
  background: #EBF4FC;
  color: var(--clr-type-int);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ── Variable Row ─────────────────────────────────────────── */
.mem-var {
  display: flex;
  align-items: center;
  padding: var(--sp-2) var(--sp-3);
  gap: var(--sp-3);
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--dur-fast) var(--ease-out);
  position: relative;
}

.mem-var:last-child { border-bottom: none; }

.mem-var.highlight {
  background: var(--clr-accent-lt);
  animation: varFlash 0.5s ease-out;
}

.mem-var.new-var {
  animation: varSlideIn 0.4s var(--ease-spring) forwards;
}

.mem-var.deleted {
  animation: varFadeOut 0.4s var(--ease-in) forwards;
}

.mem-var.rebound {
  animation: varRebind 0.5s var(--ease-out) forwards;
}

@keyframes varFlash {
  0%   { background: rgba(26,107,92,0.25); }
  100% { background: var(--clr-accent-lt); }
}

@keyframes varSlideIn {
  0%   { opacity: 0; transform: translateX(-8px); }
  100% { opacity: 1; transform: translateX(0); }
}

@keyframes varFadeOut {
  0%   { opacity: 1; max-height: 48px; }
  100% { opacity: 0; max-height: 0; padding: 0; }
}

@keyframes varRebind {
  0%   { background: transparent; }
  40%  { background: rgba(184,92,26,0.15); }
  100% { background: transparent; }
}

.mem-var__name {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-mem-stack);
  min-width: 80px;
  flex-shrink: 0;
}

.mem-var__arrow {
  color: var(--clr-text-3);
  font-size: var(--fs-xs);
  flex-shrink: 0;
}

.mem-var__ref {
  font-size: var(--fs-xs);
  color: var(--clr-mem-ref);
  font-weight: 600;
  padding: 2px 6px;
  background: rgba(184,92,26,0.08);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(184,92,26,0.2);
  cursor: pointer;
  transition: all var(--dur-fast);
}
.mem-var__ref:hover { background: rgba(184,92,26,0.15); }

.mem-var__inline-val {
  font-size: var(--fs-sm);
  color: var(--clr-text);
  flex: 1;
}

/* ── Heap ─────────────────────────────────────────────────── */
.mem-heap {
  margin-top: var(--sp-2);
}

/* ── Heap Object ──────────────────────────────────────────── */
.mem-obj {
  background: var(--clr-surface);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--sp-3);
  overflow: hidden;
  transition: all var(--dur-base) var(--ease-out);
  position: relative;
}

.mem-obj.new-obj {
  animation: objAppear 0.5s var(--ease-spring) forwards;
}

.mem-obj.gc-pending {
  border-color: #F0C5C5;
  background: #FFF0F0;
  animation: gcPulse 1s ease-in-out infinite;
}

.mem-obj.mutated {
  animation: objMutate 0.5s var(--ease-out);
}

@keyframes objAppear {
  0%   { opacity: 0; transform: scale(0.92) translateY(6px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes gcPulse {
  0%,100% { border-color: #F0C5C5; }
  50%     { border-color: #E06060; }
}

@keyframes objMutate {
  0%   { box-shadow: none; }
  40%  { box-shadow: 0 0 0 3px rgba(26,107,92,0.3); }
  100% { box-shadow: none; }
}

.mem-obj__header {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  background: var(--clr-surface-2);
  border-bottom: 1px solid var(--clr-border);
}

.mem-obj__id {
  font-size: 10px;
  color: var(--clr-text-3);
  font-weight: 600;
  margin-left: auto;
}

.mem-obj__refcount {
  font-size: 10px;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  padding: 1px 5px;
  border-radius: var(--radius-sm);
  color: var(--clr-text-3);
}

.mem-obj__refcount.decreasing {
  color: #8A1A1A;
  background: #FCE8E8;
  border-color: #F0C5C5;
}

.mem-obj__value {
  padding: var(--sp-2) var(--sp-3);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-text);
}

/* Mutable indicator */
.mem-obj.mutable {
  border-left: 3px solid var(--clr-accent);
}

.mem-obj.immutable {
  border-left: 3px solid var(--clr-text-3);
}

.mutability-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mutability-badge--mutable {
  background: var(--clr-accent-lt);
  color: var(--clr-accent);
}

.mutability-badge--immutable {
  background: var(--clr-surface-2);
  color: var(--clr-text-3);
  border: 1px solid var(--clr-border);
}

/* ── SVG Reference Arrows ─────────────────────────────────── */
.mem-arrows-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

.arrow-ref {
  stroke: var(--clr-mem-ref);
  stroke-width: 1.5;
  fill: none;
  marker-end: url(#arrowhead);
  stroke-dasharray: 5;
  animation: dashAnimate 20s linear infinite;
}

.arrow-ref.solid {
  stroke-dasharray: none;
  animation: none;
}

@keyframes dashAnimate {
  to { stroke-dashoffset: -100; }
}

/* ── Two-panel memory layout ──────────────────────────────── */
.mem-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
  align-items: start;
}

@media (max-width: 480px) {
  .mem-two-col { grid-template-columns: 1fr; }
}

/* ── Interned Object Badge ────────────────────────────────── */
.interned-badge {
  font-size: 9px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: #FFF0E6;
  color: var(--clr-accent-2);
  padding: 2px 5px;
  border-radius: var(--radius-sm);
  border: 1px solid #F5D5B8;
}

/* ── Identity Indicator ───────────────────────────────────── */
.id-match-highlight {
  animation: idMatch 1s ease-out 2;
}
@keyframes idMatch {
  0%,100% { box-shadow: none; }
  50%     { box-shadow: 0 0 0 3px var(--clr-accent); }
}

/* ── Object collections (list/tuple/set display) ──────────── */
.mem-obj__items {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1);
  padding: var(--sp-2) var(--sp-3);
}

.mem-obj__item-cell {
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  font-size: var(--fs-xs);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 3px;
}

.mem-obj__item-cell .item-index {
  color: var(--clr-text-3);
  font-size: 9px;
}

/* ── Dict display ─────────────────────────────────────────── */
.mem-obj__dict-row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-3);
  border-bottom: 1px solid var(--clr-border);
  font-size: var(--fs-xs);
}

.mem-obj__dict-row:last-child { border-bottom: none; }

.dict-key   { color: var(--clr-type-str); font-weight: 600; }
.dict-colon { color: var(--clr-text-3); }
.dict-val   { color: var(--clr-type-int); }