/* ==========================================================================
   Stepper 2.0 - Next Generation Interactive Code Stepper
   ========================================================================== */

:root {
  --step-bg-container: #0b1120;
  --step-bg-panel: #111827;
  --step-bg-code: #030712;
  --step-border: rgba(255, 255, 255, 0.1);
  --step-border-focus: #38bdf8;
  --step-text-main: #f1f5f9;
  --step-text-muted: #94a3b8;
  --step-accent-blue: #38bdf8;
  --step-accent-indigo: #6366f1;
  --step-accent-green: #10b981;
  --step-accent-amber: #f59e0b;
  --step-accent-red: #ef4444;
  --step-hl-line: rgba(56, 189, 248, 0.15);
  --step-hl-line-border: #38bdf8;
  --step-hl-token-bg: rgba(245, 158, 11, 0.3);
  --step-hl-token-border: #f59e0b;
  --step-font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Menlo, Consolas, monospace;
  --step-radius: 8px;
}

/* Outer Container */
.stepper-v2 {
  display: flex;
  flex-direction: column;
  background: var(--step-bg-container);
  border: 1px solid var(--step-border);
  border-radius: var(--step-radius);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  margin: 1.5em 0;
  overflow: hidden;
  font-family: system-ui, -apple-system, sans-serif;
  color: var(--step-text-main);
  outline: none;
}

.stepper-v2:focus-within {
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

/* Phase Badges (For loop parts & statements) */
.stepper-phase-badge,
.stepper-v2 .stepper-phase-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.2em 0.65em;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 0.6em;
  vertical-align: middle;
  flex-shrink: 0;
}

.stepper-phase-badge.part-init,
.stepper-v2 .stepper-phase-badge.part-init {
  background: rgba(56, 189, 248, 0.2);
  color: #38bdf8;
  border: 1px solid #38bdf8;
}

.stepper-phase-badge.part-cond,
.stepper-v2 .stepper-phase-badge.part-cond {
  background: rgba(245, 158, 11, 0.2);
  color: #fbbf24;
  border: 1px solid #f59e0b;
}

.stepper-phase-badge.part-body,
.stepper-v2 .stepper-phase-badge.part-body {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid #10b981;
}

.stepper-phase-badge.part-update,
.stepper-v2 .stepper-phase-badge.part-update {
  background: rgba(168, 85, 247, 0.2);
  color: #c084fc;
  border: 1px solid #a855f7;
}

.stepper-phase-badge.part-end,
.stepper-v2 .stepper-phase-badge.part-end {
  background: rgba(148, 163, 184, 0.2);
  color: #94a3b8;
  border: 1px solid #64748b;
}

/* Controls Bar */
.stepper-v2 .stepper-controls {
  display: flex;
  align-items: center;
  gap: 0.75em;
  padding: 0.6em 1em;
  background: #0f172a;
  border-bottom: 1px solid var(--step-border);
  flex-wrap: wrap;
}

.stepper-v2 .stepper-btn-group {
  display: flex;
  align-items: center;
  gap: 0.35em;
}

.stepper-v2 button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.4em 0.7em;
  min-width: 32px;
  background: #1f2937;
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 5px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s ease;
}

.stepper-v2 button:hover:not(:disabled) {
  background: #374151;
  border-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

.stepper-v2 button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.stepper-v2 button.btn-next:hover:not(:disabled),
.stepper-v2 button.btn-prev:hover:not(:disabled),
.stepper-v2 button.btn-reset:hover:not(:disabled) {
  background: rgba(56, 189, 248, 0.2);
  border-color: var(--step-accent-blue);
  color: #38bdf8;
}

.stepper-v2 button.btn-reset.needs-reset {
  background: rgba(56, 189, 248, 0.25) !important;
  border-color: var(--step-accent-blue) !important;
  color: #38bdf8 !important;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
  animation: pulse-reset 1.8s infinite;
}

@keyframes pulse-reset {
  0% { box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.6); }
  70% { box-shadow: 0 0 0 6px rgba(56, 189, 248, 0); }
  100% { box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

.stepper-v2 .stepper-slider {
  flex: 1;
  min-width: 120px;
  height: 6px;
  appearance: none;
  -webkit-appearance: none;
  background: #374151;
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.stepper-v2 .stepper-slider::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--step-accent-blue);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(56, 189, 248, 0.6);
  transition: transform 0.1s ease;
}

.stepper-v2 .stepper-slider::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

.stepper-v2 .stepper-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--step-accent-blue);
  cursor: pointer;
  border: none;
}

/* Main Stepper Grid */
.stepper-v2 .stepper-body {
  display: grid;
  grid-template-columns: 1fr;
  background: var(--step-bg-panel);
}

@media(min-width: 860px) {
  .stepper-v2 .stepper-body {
    grid-template-columns: minmax(340px, 1.25fr) minmax(280px, 1fr);
  }
}

/* Code Panel (Left) */
.stepper-v2 .stepper-code-panel {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: stretch;
  background: var(--step-bg-code);
  border-right: 1px solid var(--step-border);
  overflow-x: auto;
  position: relative;
  transition: box-shadow 0.2s ease;
}

.stepper-v2 .stepper-code-panel:focus-within {
  box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.4);
}

.stepper-v2 .code-gutter {
  width: 44px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  padding: 0.5em 0;
  background: rgba(0, 0, 0, 0.22);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  user-select: none;
  pointer-events: none;
  overflow: hidden;
}

.stepper-v2 .code-line-num {
  height: 1.55em;
  line-height: 1.55;
  text-align: right;
  padding: 0 10px 0 6px;
  color: #4b5563;
  font-family: var(--step-font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  box-sizing: border-box;
  transition: color 0.15s ease;
}

.stepper-v2 .code-line-num.active,
.stepper-v2 .code-line-num.active-sub {
  color: #38bdf8;
  font-weight: 700;
}

.stepper-v2 .code-pre {
  flex: 1;
  margin: 0 !important;
  padding: 0.5em 0 0.5em 14px !important;
  background: transparent !important;
  font-family: var(--step-font-mono);
  font-size: 0.9rem;
  line-height: 1.55;
  border: none !important;
  overflow-x: auto;
}

.stepper-v2 .code-pre code {
  display: block;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  background: transparent !important;
  padding: 0 !important;
  border: none !important;
  outline: none;
  min-width: 100%;
  white-space: pre;
  tab-size: 4;
  caret-color: var(--step-accent-blue);
}

.stepper-v2 .code-line-row {
  display: block;
  min-height: 1.55em;
  line-height: 1.55;
  transition: background-color 0.15s ease;
}

.stepper-v2 .code-line-row.active,
.stepper-v2 .code-line-row.active-sub {
  background: rgba(56, 189, 248, 0.07);
  border-radius: 3px;
}

.stepper-v2 .code-line-content {
  display: inline;
  white-space: pre;
  color: #e2e8f0;
}

.stepper-v2 .stepper-edit-hint {
  color: #7dd3fc;
  font-size: 0.9rem;
}

/* Inline highlighted token / subexpression */
.stepper-v2 .hl-token {
  display: inline-block;
  background: rgba(56, 189, 248, 0.22);
  border: 1.5px solid var(--step-accent-blue);
  border-radius: 4px;
  padding: 1px 5px;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
  font-weight: 700;
  color: #ffffff;
  transition: all 0.15s ease;
}

.stepper-v2 .hl-token.part-init {
  background: rgba(56, 189, 248, 0.25);
  border-color: #38bdf8;
  color: #e0f2fe;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
}

.stepper-v2 .hl-token.part-cond {
  background: rgba(245, 158, 11, 0.25);
  border-color: #f59e0b;
  color: #fef3c7;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

.stepper-v2 .hl-token.part-update {
  background: rgba(168, 85, 247, 0.25);
  border-color: #a855f7;
  color: #f3e8ff;
  box-shadow: 0 0 10px rgba(168, 85, 247, 0.5);
}

.stepper-v2 .hl-token.part-body {
  background: rgba(16, 185, 129, 0.25);
  border-color: #10b981;
  color: #d1fae5;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
}

/* Right Side: Info Panel (Explanation, Mem, Shell) */
.stepper-v2 .stepper-info-panel {
  display: flex;
  flex-direction: column;
  gap: 0.75em;
  background: var(--step-bg-panel);
}

/* Explanation Box (Full Width at Bottom) */
.stepper-v2 .stepper-explanation {
  background: linear-gradient(135deg, #1e3a8a 0%, #172554 100%);
  border: 1px solid #1e40af;
  border-top: 1px solid #1e40af;
  border-radius: 0 0 calc(var(--step-radius) - 1px) calc(var(--step-radius) - 1px);
  padding: 0.85em 1.25em;
  color: #f8fafc;
  font-size: 0.92rem;
  line-height: 1.5;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  min-height: 48px;
  display: flex;
  align-items: center;
  width: 100%;
  box-sizing: border-box;
}

.stepper-v2 .stepper-explanation:empty::before {
  content: 'Execució del pas...';
  color: rgba(248, 250, 252, 0.5);
  font-style: italic;
}

.stepper-v2 .stepper-explanation code,
.stepper-v2 .stepper-explanation .w {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-family: var(--step-font-mono);
  font-size: 0.88em;
  color: #ffffff;
}

/* Memory Box */
.stepper-v2 .stepper-mem {
  background: #090d16;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  padding: 0.75em 1em;
  min-height: 60px;
  font-family: var(--step-font-mono);
  font-size: 0.88rem;
}

.stepper-v2 .stepper-mem-header {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--step-accent-green);
  margin-bottom: 0.5em;
  display: flex;
  align-items: center;
  gap: 0.4em;
}

.stepper-v2 .stepper-mem-header::before {
  content: '⚡';
}

.stepper-v2 .stepper-mem-list {
  display: flex;
  flex-direction: column;
  gap: 0.35em;
}

.stepper-v2 .mem-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.25em 0.5em;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 4px;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
}

.stepper-v2 .mem-item.changed {
  background: rgba(16, 185, 129, 0.15);
  border-left-color: var(--step-accent-green);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.2);
  animation: mem-pulse 0.4s ease-out;
}

@keyframes mem-pulse {
  0% { transform: scale(0.97); opacity: 0.5; }
  50% { transform: scale(1.02); }
  100% { transform: scale(1); opacity: 1; }
}

.stepper-v2 .mem-name {
  color: #94a3b8;
  font-weight: 500;
}

.stepper-v2 .mem-val {
  color: #f1f5f9;
  font-weight: 700;
}

.stepper-v2 .mem-item.changed .mem-val {
  color: #34d399;
}

.stepper-v2 .stepper-mem:empty::after,
.stepper-v2 .stepper-mem-list:empty::after {
  content: '(sense variables)';
  color: #475569;
  font-style: italic;
  font-size: 0.8rem;
}

/* Console Boxes (In & Out) */
.stepper-v2 .stepper-console,
.stepper-v2 .stepper-shell {
  background: #030712;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  padding: 0.75em 1em;
  min-height: 48px;
  font-family: var(--step-font-mono);
  font-size: 0.88rem;
  color: #e2e8f0;
}

.stepper-v2 .stepper-console-header,
.stepper-v2 .stepper-shell-header {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5em;
  display: flex;
  align-items: center;
  gap: 0.4em;
}

.stepper-v2 .stepper-console-header::before,
.stepper-v2 .stepper-shell-header::before {
  content: '>';
  font-weight: 900;
}

.stepper-v2 .stepper-console-in .stepper-console-header {
  color: var(--step-accent-blue);
}

.stepper-v2 .stepper-console-out .stepper-console-header,
.stepper-v2 .stepper-shell-header {
  color: #a78bfa;
}

.stepper-v2 .stepper-console-content,
.stepper-v2 .stepper-shell-content {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.45;
}

.stepper-v2 .stepper-console-in {
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.stepper-v2 .stepper-console-in:focus-within {
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.4), inset 0 0 6px rgba(56, 189, 248, 0.1);
}

.stepper-v2 .stepper-console-in-content {
  outline: none;
  caret-color: var(--step-accent-blue);
  cursor: text;
}

.stepper-v2 .stepper-console-in .stepper-console-content:empty:not(:focus)::after {
  content: '(sense entrades)';
  color: #475569;
  font-style: italic;
  font-size: 0.8rem;
}

.stepper-v2 .stepper-console-out .stepper-console-content:empty::after,
.stepper-v2 .stepper-shell-content:empty::after {
  content: '(sense eixida per consola)';
  color: #475569;
  font-style: italic;
  font-size: 0.8rem;
}

.stepper-v2 .stepper-console-content .in,
.stepper-v2 .stepper-shell-content .in {
  color: #38bdf8;
  font-weight: 700;
  background: rgba(56, 189, 248, 0.12);
  padding: 0 0.3em;
  border-radius: 3px;
}

.stepper-v2 .stepper-console-in .in-line {
  color: #38bdf8;
  font-weight: 700;
  line-height: 1.5;
}

.stepper-v2 .stepper-console-in .in-line.consumed {
  text-decoration: line-through red 0.2rem;
  opacity: 0.7;
}

.stepper-v2 .stepper-console-content .out,
.stepper-v2 .stepper-shell-content .out {
  color: #f8fafc;
}