/* AlgoMaster Visualizer Styling — v2 */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg: #060a14;
  --bg2: #080d18;
  --panel: #0c1220;
  --card: #0f1828;
  --border: #1a2740;
  --border-soft: #111d30;
  --border-bright: #243550;
  --text: #e2eaf8;
  --dim: #7a8fa8;
  --mute: #3d526a;
  --teal: #2dd4bf;
  --cyan: #06b6d4;
  --purple: #a78bfa;
  --purple-main: #7c3aed;
  --purple-glow: rgba(124, 58, 237, 0.25);
  --blue: #3b82f6;
  --blue-dim: rgba(59, 130, 246, 0.15);
  --pink: #ec4899;
  --green: #34d399;
  --amber: #fbbf24;
  --red: #ef4444;
  --mono: 'JetBrains Mono', 'SF Mono', ui-monospace, Menlo, monospace;
  --sans: 'Inter', -apple-system, system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

/* ─── Player Container ─── */
.algo-player {
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.5rem;
}

.simulator-content .algo-player {
  padding: 0;
  margin: 0;
  max-width: 100%;
}

/* ─── Controls Bar ─── */
.player-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.875rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 1.25rem;
  gap: 1.5rem;
  animation: slideDown 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Transport buttons */
.control-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--dim);
  height: 38px;
  padding: 0 0.875rem;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.control-btn:hover {
  background: var(--border);
  border-color: var(--purple-main);
  color: var(--text);
  box-shadow: 0 0 0 1px var(--purple-main), 0 0 16px var(--purple-glow);
}

.control-btn:active { transform: scale(0.96); }

/* Play button — visually prominent */
#play-btn, #pause-btn {
  background: var(--purple-main);
  border-color: var(--purple-main);
  color: white;
  padding: 0 1.25rem;
  height: 38px;
  font-size: 0.85rem;
}

#play-btn:hover, #pause-btn:hover {
  background: #6d28d9;
  box-shadow: 0 0 0 1px #6d28d9, 0 0 24px var(--purple-glow);
  color: white;
}

/* Step counter badge */
.step-badge {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.25rem 0.875rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--dim);
  font-family: var(--mono);
  letter-spacing: 0.05em;
}

.control-group label {
  font-size: 0.8rem;
  color: var(--dim);
  font-weight: 500;
}

#speed-slider {
  width: 100px;
  height: 4px;
  accent-color: var(--purple-main);
  cursor: pointer;
}

#speed-label {
  min-width: 28px;
  color: var(--purple);
  font-weight: 700;
  font-size: 0.8rem;
  font-family: var(--mono);
}

/* ─── Player Grid ─── */
.player-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  grid-template-rows: auto auto auto;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.simulator-content .player-grid {
  margin-bottom: 0;
  gap: 0.875rem;
}

/* ─── Panel Base ─── */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 800px;
  animation: slideUp 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

.simulator-content .panel { max-height: 550px; }

.panel:nth-child(1) { animation-delay: 0.05s; }
.panel:nth-child(2) { animation-delay: 0.1s; }
.panel:nth-child(3) { animation-delay: 0.15s; }
.panel:nth-child(4) { animation-delay: 0.2s; }

.panel-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.panel-header::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--purple-main);
  flex-shrink: 0;
}

.panel > div:not(.panel-header) {
  flex: 1;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
}

/* ─── Code Panel ─── */
.code-panel {
  grid-column: 1;
  grid-row: 1 / 3;
}

.code-panel .panel-header::before { background: #7c3aed; }
.code-panel .panel-header { color: #a78bfa; }

.code-content {
  background: #060a14;
  padding: 0.5rem 0;
}

#code-display {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.code-line {
  display: flex;
  align-items: center;
  padding: 0.3rem 0;
  border-left: 3px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease;
  cursor: default;
}

.code-line:hover {
  background: rgba(255,255,255,0.02);
}

.code-line .line-num {
  color: var(--mute);
  display: inline-block;
  width: 3.5rem;
  text-align: right;
  padding-right: 1.25rem;
  flex-shrink: 0;
  font-size: 0.75rem;
  user-select: none;
}

.code-line .line-code {
  color: #c9d7f0;
  white-space: pre;
  line-height: 1.6;
  font-size: 0.85rem;
}

/* Active / current line */
.code-line.current-line {
  background: linear-gradient(90deg, rgba(124,58,237,0.18) 0%, rgba(124,58,237,0.04) 100%);
  border-left-color: var(--purple-main);
  box-shadow: inset 0 0 0 0 transparent;
}

.code-line.current-line .line-num {
  color: var(--purple-main);
  font-weight: 700;
}

.code-line.current-line .line-code {
  color: #d4b8ff;
}

/* Syntax token colors */
.tok-kw  { color: #c084fc; }
.tok-fn  { color: #60a5fa; }
.tok-str { color: #34d399; }
.tok-num { color: #fb923c; }
.tok-cmt { color: #4a6278; font-style: italic; }

/* ─── Variables Panel ─── */
.variables-panel {
  grid-column: 2;
  grid-row: 1;
}

.variables-panel .panel-header::before { background: #06b6d4; }
.variables-panel .panel-header { color: #67e8f9; }

.variables-panel > div:not(.panel-header) {
  padding: 0.75rem;
}

.variables-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  font-family: var(--mono);
}

.variables-table th {
  background: var(--card);
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  color: var(--dim);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.variables-table td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--border-soft);
  vertical-align: middle;
}

.variables-table tr:last-child td { border-bottom: none; }

.variables-table tr.changed {
  background: linear-gradient(90deg, rgba(236,72,153,0.12), transparent);
}

.variables-table tr.changed td { color: var(--pink); }

.var-name {
  color: var(--cyan);
  font-weight: 600;
  font-size: 0.82rem;
}

.var-value {
  color: var(--text);
  word-break: break-all;
  font-size: 0.8rem;
}

/* ─── Visualization Panel ─── */
.visualization-panel {
  grid-column: 2;
  grid-row: 2;
}

.visualization-panel .panel-header::before { background: var(--amber); }
.visualization-panel .panel-header { color: #fde68a; }

.visualization-panel > div:not(.panel-header) {
  padding: 1rem;
}

.viz-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.viz-item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.viz-label {
  color: var(--amber);
  font-size: 0.68rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.1em;
  font-family: var(--sans);
}

.viz-array {
  display: flex;
  gap: 0.375rem;
  flex-wrap: wrap;
  align-items: center;
}

.array-cell {
  background: var(--card);
  border: 1px solid var(--border-bright);
  padding: 0.45rem 0.625rem;
  border-radius: 6px;
  color: var(--text);
  font-size: 0.78rem;
  min-width: 38px;
  text-align: center;
  font-family: var(--mono);
  font-weight: 500;
  transition: background 0.2s, border-color 0.2s;
}

.array-cell.active {
  background: rgba(124,58,237,0.2);
  border-color: var(--purple-main);
  color: var(--purple);
}

.viz-value {
  background: var(--card);
  border: 1px solid var(--border-bright);
  padding: 0.45rem 0.75rem;
  border-radius: 6px;
  color: var(--teal);
  word-break: break-all;
  font-size: 0.8rem;
  font-family: var(--mono);
}

.viz-map {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.map-entry {
  background: var(--card);
  border: 1px solid var(--border-bright);
  padding: 0.4rem 0.625rem;
  border-radius: 6px;
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.78rem;
  font-family: var(--mono);
}

.map-key   { color: var(--teal); font-weight: 600; }
.map-arrow { color: var(--mute); }
.map-val   { color: var(--text); }

/* ─── Trace Panel ─── */
.trace-panel {
  grid-column: 1 / 3;
  grid-row: 3;
}

.trace-panel .panel-header::before { background: var(--green); }
.trace-panel .panel-header { color: #6ee7b7; }

.trace-panel > div:not(.panel-header) {
  padding: 0.75rem;
}

.trace-item {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  padding: 0.875rem;
  background: var(--card);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.trace-line {
  font-size: 0.7rem;
  color: var(--purple);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--sans);
}

.trace-code {
  background: var(--bg);
  padding: 0.5rem 0.875rem;
  border-radius: 6px;
  color: var(--cyan);
  border-left: 3px solid var(--purple-main);
  font-size: 0.82rem;
  font-family: var(--mono);
}

.trace-narration {
  color: var(--dim);
  line-height: 1.6;
  font-size: 0.82rem;
  font-family: var(--sans);
}

/* ─── Info Panel (hidden) ─── */
.info-panel { display: none; }

.info-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1rem;
}

.info-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.info-label { color: var(--dim); font-size: 0.82rem; }
.info-value { color: var(--purple); font-weight: 600; font-family: var(--mono); }

/* ─── Scrollbars ─── */
.panel > div:not(.panel-header)::-webkit-scrollbar { width: 5px; }
.panel > div:not(.panel-header)::-webkit-scrollbar-track { background: transparent; }
.panel > div:not(.panel-header)::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
.panel > div:not(.panel-header)::-webkit-scrollbar-thumb:hover {
  background: var(--purple-main);
}

/* ─── Responsive ─── */
@media (max-width: 1100px) {
  .algo-player { padding: 1rem; }

  .player-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .code-panel        { grid-column: 1; grid-row: 1; }
  .variables-panel   { grid-column: 1; grid-row: 2; }
  .visualization-panel { grid-column: 1; grid-row: 3; }
  .trace-panel       { grid-column: 1; grid-row: 4; }

  .panel { max-height: 380px; }
}

@media (max-width: 768px) {
  .player-controls { flex-direction: column; gap: 0.75rem; }
  .control-group { width: 100%; justify-content: center; flex-wrap: wrap; }
  .panel { max-height: 300px; }
}

/* ─── Animations ─── */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--purple-glow); }
  50%       { box-shadow: 0 0 0 4px var(--purple-glow); }
}

.current-line { animation: none; }

/* Index page cards etc. — kept below */

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes glow {
  from {
    box-shadow: 0 0 8px rgba(124, 58, 237, 0.3);
  }
  to {
    box-shadow: 0 0 20px rgba(124, 58, 237, 0.6);
  }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

@keyframes highlight {
  from {
    background: rgba(124, 58, 237, 0.3);
  }
  to {
    background: transparent;
  }
}

/* Apply animations to elements */
.player-controls {
  animation: slideDown 0.5s ease-out;
}

.player-grid {
  animation: slideUp 0.6s ease-out;
}

.panel {
  animation: slideUp 0.5s ease-out;
}

.code-panel {
  animation-delay: 0.1s;
}

.variables-panel {
  animation-delay: 0.2s;
}

.visualization-panel {
  animation-delay: 0.3s;
}

.trace-panel {
  animation-delay: 0.4s;
}

.current-line {
  animation: none;
}

.changed {
  animation: highlight 0.6s ease-out forwards;
}

.control-btn:hover {
  animation: bounce 0.4s ease-in-out;
}

/* Smooth transitions for step changes */
.player-grid {
  transition: all 0.3s ease;
}

.panel {
  transition: all 0.2s ease;
}

.code-panel code {
  transition: all 0.2s ease;
}

.array-cell {
  transition: all 0.2s ease;
}

.map-entry {
  transition: all 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}