/* ========================================
   DSA Visualizer — Visualization Styles
   ======================================== */

/* --- Visualization Container --- */
.viz-container {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  min-height: 350px;
  position: relative;
  overflow: hidden;
}

.viz-container__label {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: var(--fs-xs);
  color: var(--text-muted);
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* --- Sorting Bars --- */
.sort-bars {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 280px;
  gap: 2px;
  padding: var(--space-md) 0;
}

.sort-bar {
  flex: 1;
  max-width: 50px;
  min-width: 4px;
  border-radius: var(--radius-xs) var(--radius-xs) 0 0;
  background: var(--gradient-primary);
  transition: height 0.15s var(--ease-out), background 0.2s ease, transform 0.2s var(--ease-bounce);
  position: relative;
  transform-origin: bottom center;
}

.sort-bar::after {
  content: attr(data-value);
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  white-space: nowrap;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.sort-bars:hover .sort-bar::after {
  opacity: 1;
}

/* Bar States */
.sort-bar--default {
  background: linear-gradient(180deg, rgba(0,212,255,0.7) 0%, rgba(124,58,237,0.5) 100%);
}

.sort-bar--comparing {
  background: var(--accent-yellow) !important;
  box-shadow: 0 0 15px rgba(234, 179, 8, 0.3);
  transform: scaleY(1.02);
}

.sort-bar--swapping {
  background: var(--accent-red) !important;
  box-shadow: 0 0 15px rgba(239, 68, 68, 0.3);
  transform: scaleY(1.04);
}

.sort-bar--sorted {
  background: var(--accent-green) !important;
  box-shadow: 0 0 10px rgba(34, 197, 94, 0.2);
}

.sort-bar--pivot {
  background: var(--accent-pink) !important;
  box-shadow: 0 0 15px rgba(244, 63, 142, 0.3);
}

.sort-bar--active {
  background: var(--accent-cyan) !important;
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
}

.sort-bar--merged {
  background: var(--accent-purple) !important;
  box-shadow: 0 0 15px rgba(124, 58, 237, 0.3);
}

/* --- Search Array Cells --- */
.search-array {
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: var(--space-xl) 0;
  flex-wrap: wrap;
}

.search-cell {
  width: 56px;
  height: 56px;
  border: 2px solid var(--border-glass);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  transition: all 0.25s var(--ease-out);
  position: relative;
  background: var(--bg-glass);
}

.search-cell__index {
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Cell States */
.search-cell--checking {
  border-color: var(--accent-yellow);
  background: rgba(234, 179, 8, 0.1);
  color: var(--accent-yellow);
  transform: scale(1.1);
  box-shadow: 0 0 15px rgba(234, 179, 8, 0.2);
}

.search-cell--found {
  border-color: var(--accent-green);
  background: rgba(34, 197, 94, 0.15);
  color: var(--accent-green);
  transform: scale(1.15);
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
}

.search-cell--eliminated {
  border-color: transparent;
  background: rgba(0,0,0,0.05);
  color: var(--text-muted);
  opacity: 0.3;
}

.search-cell--range {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.05);
}

.search-cell--mid {
  border-color: var(--accent-purple);
  background: rgba(124, 58, 237, 0.12);
  color: var(--accent-purple);
  box-shadow: 0 0 15px rgba(124, 58, 237, 0.2);
}

/* --- Stack & Queue Containers --- */
.ds-container {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  min-height: 300px;
  padding: var(--space-xl);
  position: relative;
}

/* Stack */
.stack-visual {
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
  min-width: 160px;
  position: relative;
}

.stack-visual::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: -10px;
  right: -10px;
  height: 3px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.stack-element {
  padding: var(--space-sm) var(--space-xl);
  background: linear-gradient(135deg, rgba(0,212,255,0.12) 0%, rgba(124,58,237,0.12) 100%);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: var(--radius-sm);
  text-align: center;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  animation: fadeInUp 0.3s var(--ease-bounce);
  transition: all 0.3s var(--ease-out);
}

.stack-element--top {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.12);
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.15);
}

.stack-element--removing {
  animation: fadeOutUp 0.3s var(--ease-out) forwards;
}

@keyframes fadeOutUp {
  to { opacity: 0; transform: translateY(-20px) scale(0.9); }
}

/* Queue */
.queue-visual {
  display: flex;
  gap: 4px;
  min-height: 60px;
  align-items: center;
  position: relative;
  padding: 0 var(--space-xl);
}

.queue-visual::before,
.queue-visual::after {
  font-size: var(--fs-xs);
  color: var(--text-muted);
  font-weight: var(--fw-semibold);
  position: absolute;
  top: -24px;
}

.queue-visual::before {
  content: 'FRONT';
  left: var(--space-xl);
}

.queue-visual::after {
  content: 'REAR';
  right: var(--space-xl);
}

.queue-element {
  padding: var(--space-sm) var(--space-lg);
  background: linear-gradient(135deg, rgba(124,58,237,0.12) 0%, rgba(244,63,142,0.12) 100%);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  animation: slideInRight 0.3s var(--ease-bounce);
  transition: all 0.3s var(--ease-out);
}

.queue-element:first-child {
  border-color: var(--accent-green);
  background: rgba(34, 197, 94, 0.08);
}

.queue-element:last-child {
  border-color: var(--accent-purple);
  background: rgba(124, 58, 237, 0.08);
}

.queue-element--removing {
  animation: slideOutLeft 0.3s var(--ease-out) forwards;
}

@keyframes slideOutLeft {
  to { opacity: 0; transform: translateX(-30px) scale(0.9); }
}

/* --- Linked List --- */
.ll-container {
  display: flex;
  align-items: center;
  gap: 0;
  padding: var(--space-xl);
  overflow-x: auto;
  min-height: 120px;
  justify-content: center;
  flex-wrap: wrap;
}

.ll-node {
  display: flex;
  align-items: center;
  gap: 0;
  animation: scaleIn 0.3s var(--ease-bounce);
}

.ll-node__box {
  display: flex;
  border-radius: var(--radius-sm);
  border: 2px solid rgba(34, 197, 94, 0.3);
  overflow: hidden;
  transition: all 0.3s var(--ease-out);
}

.ll-node__data {
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  background: rgba(34, 197, 94, 0.06);
  min-width: 48px;
  text-align: center;
}

.ll-node__ptr {
  padding: var(--space-sm) var(--space-sm);
  border-left: 1px solid rgba(34, 197, 94, 0.2);
  background: rgba(34, 197, 94, 0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--accent-green);
}

.ll-node__arrow {
  width: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-green);
  font-size: 14px;
}

.ll-node--head .ll-node__box {
  border-color: var(--accent-cyan);
}
.ll-node--head .ll-node__data {
  background: rgba(0, 212, 255, 0.08);
}

.ll-node--highlight .ll-node__box {
  border-color: var(--accent-yellow);
  box-shadow: 0 0 15px rgba(234, 179, 8, 0.2);
}

.ll-node--found .ll-node__box {
  border-color: var(--accent-green);
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.3);
}

.ll-null {
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--text-muted);
  font-style: italic;
}

.ll-label {
  position: absolute;
  font-size: var(--fs-xs);
  color: var(--accent-cyan);
  font-weight: var(--fw-semibold);
}

/* --- Tree Visualization --- */
.tree-svg {
  width: 100%;
  height: 350px;
  display: block;
}

.tree-node {
  cursor: pointer;
  transition: all 0.3s var(--ease-out);
}

.tree-node circle {
  fill: var(--bg-tertiary);
  stroke: rgba(249, 115, 22, 0.4);
  stroke-width: 2;
  transition: all 0.3s var(--ease-out);
}

.tree-node text {
  fill: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}

.tree-node--highlight circle {
  stroke: var(--accent-yellow);
  fill: rgba(234, 179, 8, 0.12);
  stroke-width: 3;
  filter: drop-shadow(0 0 8px rgba(234, 179, 8, 0.3));
}

.tree-node--visited circle {
  stroke: var(--accent-green);
  fill: rgba(34, 197, 94, 0.12);
}

.tree-node--found circle {
  stroke: var(--accent-green);
  fill: rgba(34, 197, 94, 0.2);
  stroke-width: 3;
  filter: drop-shadow(0 0 12px rgba(34, 197, 94, 0.4));
}

.tree-edge {
  stroke: rgba(249, 115, 22, 0.2);
  stroke-width: 2;
  fill: none;
  transition: all 0.3s var(--ease-out);
}

.tree-edge--highlight {
  stroke: var(--accent-yellow);
  stroke-width: 3;
  filter: drop-shadow(0 0 4px rgba(234, 179, 8, 0.3));
}

/* --- Graph Visualization --- */
.graph-svg {
  width: 100%;
  height: 380px;
  display: block;
}

.graph-node {
  cursor: pointer;
  transition: all 0.3s var(--ease-out);
}

.graph-node circle {
  fill: var(--bg-tertiary);
  stroke: rgba(59, 130, 246, 0.4);
  stroke-width: 2;
  transition: all 0.3s var(--ease-out);
}

.graph-node text {
  fill: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}

.graph-node--current circle {
  stroke: var(--accent-yellow);
  fill: rgba(234, 179, 8, 0.15);
  stroke-width: 3;
  filter: drop-shadow(0 0 10px rgba(234, 179, 8, 0.3));
}

.graph-node--visited circle {
  stroke: var(--accent-green);
  fill: rgba(34, 197, 94, 0.12);
}

.graph-node--queued circle {
  stroke: var(--accent-cyan);
  fill: rgba(0, 212, 255, 0.08);
}

.graph-edge {
  stroke: rgba(59, 130, 246, 0.15);
  stroke-width: 2;
  fill: none;
  transition: all 0.3s var(--ease-out);
}

.graph-edge--visited {
  stroke: var(--accent-green);
  stroke-width: 3;
  filter: drop-shadow(0 0 4px rgba(34, 197, 94, 0.3));
}

.graph-edge-weight {
  fill: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  text-anchor: middle;
}

/* --- Playground Vis --- */
.playground-viz {
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.playground-viz .empty-state {
  padding: var(--space-2xl);
}

/* --- Responsive Viz --- */
@media (max-width: 768px) {
  .sort-bars { height: 200px; }
  .search-cell { width: 44px; height: 44px; font-size: var(--fs-xs); }
  .tree-svg { height: 280px; }
  .graph-svg { height: 300px; }
  .viz-container { padding: var(--space-md); min-height: 250px; }
}