/* ── Physics Playground ──────────────────────────────────────── */

.pg-hero {
  padding: 4rem 1.5rem 2.5rem;
  background: linear-gradient(180deg, rgba(0,255,136,0.04) 0%, transparent 100%);
  border-bottom: 1px solid var(--border-dim);
}

.pg-hero-inner {
  max-width: 700px;
  margin: 0 auto;
}

.pg-h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.5rem);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin-bottom: 0.75rem;
  margin-top: 0.5rem;
  text-transform: uppercase;
}

.pg-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  max-width: 580px;
}

/* ── Main layout ─────────────────────────────────────────────── */

.pg-main {
  padding: 2.5rem 1.5rem 3rem;
}

.pg-layout {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 900px) {
  .pg-layout {
    grid-template-columns: 380px 1fr;
    align-items: start;
  }
}

/* ── Panels ──────────────────────────────────────────────────── */

.pg-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  padding: 1.75rem;
  /* Prevent content from blowing out the panel width on mobile */
  min-width: 0;
  overflow: hidden;
}

/* On mobile the result panel can get very tall; keep it self-contained */
@media (max-width: 899px) {
  .pg-main {
    padding: 1.5rem 0.75rem 2.5rem;
  }
  .pg-panel {
    padding: 1.25rem;
  }
  /* Pre blocks: scroll horizontally, never overflow the card */
  .pg-cko-pre,
  .pg-snippet,
  .pg-modulation {
    font-size: 0.68rem;
    max-height: 220px;
  }
  /* Result metric grid: 2 columns still but smaller */
  .pg-result-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;
  }
  .pg-metric-value {
    font-size: 1.1rem;
  }
  /* Operator rows: clamp name width */
  .pg-op-eq-name {
    font-size: 0.68rem;
  }
  .pg-op-eq-formula {
    font-size: 0.65rem;
  }
  .pg-wizard-step-value {
    font-size: 0.65rem;
  }
}

.pg-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.pg-panel-label {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ── Input controls ──────────────────────────────────────────── */

.pg-field {
  margin-bottom: 1.25rem;
}

.pg-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  letter-spacing: 0.03em;
}

.pg-select-wrap {
  position: relative;
}

.pg-select {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.65rem 2rem 0.65rem 0.9rem;
  appearance: none;
  cursor: pointer;
  transition: border-color 0.15s;
}

.pg-select:focus {
  outline: none;
  border-color: var(--accent);
}

.pg-select-wrap::after {
  content: "▾";
  position: absolute;
  right: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  pointer-events: none;
  font-size: 0.8rem;
}

.pg-domain-desc {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.4rem;
  font-style: italic;
  line-height: 1.5;
}

.pg-domain-desc--cross {
  color: rgba(0,255,136,0.7);
  font-style: normal;
}

/* Cross-domain experiment badge */
.pg-cross-badge {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.25em 0.7em;
  border-radius: 999px;
  background: rgba(0,255,136,0.08);
  border: 1px solid rgba(0,255,136,0.3);
  color: var(--accent);
  text-transform: uppercase;
}

/* Input rows */
.pg-inputs {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pg-input-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.pg-input-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.pg-input-label span {
  color: var(--accent-dim);
  font-size: 0.68rem;
  margin-left: 0.35rem;
}

.pg-input {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 0.55rem 0.9rem;
  transition: border-color 0.15s;
  box-sizing: border-box;
}

.pg-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* Compute button */
.pg-compute-btn {
  width: 100%;
  margin-top: 1.5rem;
  padding: 0.85rem 1.5rem;
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: 0.95rem;
  font-family: var(--font-mono);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  letter-spacing: 0.02em;
}

.pg-compute-btn:hover:not(:disabled) {
  opacity: 0.88;
  transform: translateY(-1px);
}

.pg-compute-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.pg-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(0,0,0,0.3);
  border-top-color: #000;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.pg-note {
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  line-height: 1.6;
}

.pg-rate-msg {
  margin-top: 0.75rem;
  padding: 0.6rem 0.9rem;
  background: rgba(255,95,87,0.1);
  border: 1px solid rgba(255,95,87,0.3);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #ff5f57;
}

/* ── Empty state ─────────────────────────────────────────────── */

.pg-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  gap: 1.25rem;
}

.pg-empty-pulse {
  position: relative;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pg-empty-ring {
  position: absolute;
  border: 1px solid rgba(0,255,136,0.2);
  border-radius: 50%;
  animation: pulse-ring 2s ease-out infinite;
}

.pg-empty-ring {
  width: 64px;
  height: 64px;
}

.pg-empty-ring--2 {
  width: 44px;
  height: 44px;
  animation-delay: 0.5s;
  border-color: rgba(0,255,136,0.35);
}

@keyframes pulse-ring {
  0% { transform: scale(0.85); opacity: 0.7; }
  50% { transform: scale(1.1); opacity: 0.3; }
  100% { transform: scale(0.85); opacity: 0.7; }
}

.pg-empty-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(0,255,136,0.8);
  animation: dot-pulse 777ms ease-in-out infinite alternate;
}

@keyframes dot-pulse {
  from { opacity: 0.6; transform: scale(0.9); }
  to   { opacity: 1;   transform: scale(1.1); }
}

.pg-empty-text {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ── Loading state ───────────────────────────────────────────── */

.pg-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
}

.pg-pulse-ring {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(0,255,136,0.08);
  border: 2px solid rgba(0,255,136,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: pulse-glow 777ms ease-in-out infinite alternate;
}

.pg-pulse-inner {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px rgba(0,255,136,0.9);
  animation: pulse-glow 777ms ease-in-out infinite alternate;
}

@keyframes pulse-glow {
  from { opacity: 0.6; transform: scale(0.92); }
  to   { opacity: 1;   transform: scale(1.08); box-shadow: 0 0 24px rgba(0,255,136,1); }
}

/* ── Result card ─────────────────────────────────────────────── */

.pg-result-card {
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.pg-result-domain {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-dim);
}

.pg-result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.pg-result-metric {
  background: var(--bg-surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
}

.pg-metric-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.pg-metric-value {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 0.2rem;
}

.pg-metric-value.accent { color: var(--accent); }
.pg-metric-value.dim { color: var(--text-muted); font-size: 1rem; }

.pg-metric-sub {
  font-size: 0.68rem;
  color: var(--text-dim);
}

.pg-operators-section {
  margin-bottom: 1.25rem;
}

.pg-operators {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pg-op-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2em 0.6em;
  border-radius: 4px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-surface);
}

.pg-op-tag.ko42 {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,255,136,0.06);
}

.pg-op-tag.domain {
  font-size: 0.8rem;
  padding: 0.3em 0.75em;
  border-color: rgba(0,255,136,0.4);
  color: #e0fff2;
  background: rgba(0,255,136,0.08);
  font-weight: 600;
}

.pg-op-tag.secondary {
  font-size: 0.65rem;
  padding: 0.15em 0.5em;
  color: var(--text-dim);
  border-color: var(--border-dim);
}

.pg-op-tag.dim {
  color: var(--text-dim);
  font-style: italic;
}

.pg-operators-secondary {
  gap: 0.3rem;
}

.pg-awareness-layer {
  margin-top: 0.75rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border-dim);
}

.pg-awareness-label {
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

/* Infrastructure chips — awareness ops displayed as system badges only, no equations */
.pg-infra-row {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.pg-infra-label {
  font-size: 0.6rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-right: 0.2rem;
  flex-shrink: 0;
}

.pg-infra-chip {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.15em 0.5em;
  border-radius: 3px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-dim);
  color: var(--text-dim);
  cursor: default;
}

/* ── Operator equation rows ──────────────────────────────────── */

.pg-op-eq-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.pg-op-eq-list--secondary {
  gap: 0.4rem;
}

.pg-op-eq-row {
  background: var(--bg-surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
}

.pg-op-eq-row--domain {
  border-color: rgba(0,255,136,0.25);
  background: rgba(0,255,136,0.04);
}

.pg-op-eq-row--secondary {
  padding: 0.45rem 0.75rem;
  border-color: var(--border-dim);
  background: rgba(255,255,255,0.02);
}

.pg-op-eq-header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.3rem;
}

.pg-op-eq-id {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.06em;
  background: rgba(0,255,136,0.1);
  border: 1px solid rgba(0,255,136,0.25);
  border-radius: 3px;
  padding: 0.1em 0.45em;
  flex-shrink: 0;
}

.pg-op-eq-id.secondary {
  color: var(--text-dim);
  background: rgba(255,255,255,0.04);
  border-color: var(--border-dim);
}

.pg-op-eq-name {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: #e0fff2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pg-op-eq-row--secondary .pg-op-eq-name {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

.pg-op-eq-formula {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.5;
  word-break: break-word;
  padding-left: 0.1rem;
}

.pg-op-eq-row--domain .pg-op-eq-formula {
  color: rgba(224,255,242,0.65);
}

/* ── 7-Step Wizard Trace ─────────────────────────────────────── */

.pg-wizard-section {
  margin-bottom: 1.25rem;
  background: rgba(0,0,0,0.2);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.pg-wizard-header {
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 0.5rem 0.9rem;
  background: rgba(0,255,136,0.04);
  border-bottom: 1px solid var(--border-dim);
  opacity: 0.75;
}

.pg-wizard-steps {
  display: flex;
  flex-direction: column;
}

.pg-wizard-step {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--border-dim);
}

.pg-wizard-step--last {
  border-bottom: none;
  background: rgba(0,255,136,0.03);
}

.pg-wizard-step-num {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(0,255,136,0.1);
  border: 1px solid rgba(0,255,136,0.2);
  border-radius: 3px;
  padding: 0.1em 0.4em;
  flex-shrink: 0;
  margin-top: 0.05rem;
  letter-spacing: 0.04em;
}

.pg-wizard-step-body {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.pg-wizard-step-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.pg-wizard-step-value {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text);
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-line;
}

.pg-wizard-step--last .pg-wizard-step-value {
  color: var(--accent);
  font-weight: 600;
}

/* ── CKO Master Equation ─────────────────────────────────────── */

.pg-cko-section {
  margin-bottom: 1.25rem;
  border: 1px solid rgba(0,255,136,0.2);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: rgba(0,255,136,0.02);
}

.pg-cko-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 0.9rem;
  background: rgba(0,255,136,0.06);
  border-bottom: 1px solid rgba(0,255,136,0.15);
}

.pg-cko-title {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.pg-cko-badge {
  font-size: 0.62rem;
  color: rgba(0,255,136,0.6);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.pg-cko-pre {
  margin: 0;
  padding: 1rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--text);
  overflow-x: auto;
  overflow-y: auto;
  max-height: 340px;
  white-space: pre;
  tab-size: 2;
}

.pg-modulation {
  font-size: 0.75rem;
  color: var(--text-dim);
  padding: 0.65rem 0.9rem;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
  overflow-x: auto;
  white-space: nowrap;
}

/* ── Precision badge ─────────────────────────────────────────── */

.pg-result-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.2em 0.7em;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

.pg-result-badge.ok {
  background: rgba(0,255,136,0.1);
  border: 1px solid rgba(0,255,136,0.3);
  color: var(--accent);
}

/* ── Code snippet ────────────────────────────────────────────── */

.pg-snippet-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 1rem;
}

.pg-snippet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.9rem;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border-dim);
}

.pg-copy-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 0.72rem;
  padding: 0.2em 0.6em;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.pg-copy-btn:hover, .pg-copy-btn.copied {
  color: var(--accent);
  border-color: var(--accent);
}

.pg-snippet {
  margin: 0;
  padding: 1rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--text);
  overflow-x: auto;
  white-space: pre;
  tab-size: 2;
}

/* ── CTA ─────────────────────────────────────────────────────── */

.pg-cta {
  background: rgba(0,255,136,0.05);
  border: 1px solid rgba(0,255,136,0.2);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  animation: fadeIn 0.35s ease;
}

.pg-cta-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.pg-cta-btn {
  display: inline-block;
  background: var(--accent);
  color: #000;
  font-weight: 700;
  font-size: 0.88rem;
  font-family: var(--font-mono);
  padding: 0.7rem 1.3rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: opacity 0.15s;
  white-space: nowrap;
}

.pg-cta-btn:hover {
  opacity: 0.85;
  text-decoration: none;
}