/* ==========================================================================
   USP Playground — Styles
   Comprehensive CSS for the interactive USP scheduling flow simulator.
   All classes prefixed with `pg-` to avoid conflicts with the main site.
   ========================================================================== */

/* ---------- Font Import ---------- */
@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@400;500;700&display=swap');

/* ---------- Playground Tokens ---------- */
:root {
  /* Core palette */
  --pg-primary: #0d9488;
  --pg-primary-light: #14b8a6;
  --pg-primary-lighter: #14b8a6;
  --pg-primary-dark: #0f766e;
  --pg-primary-darkest: #115e59;

  /* Backgrounds — light neutral theme */
  --pg-bg: transparent;
  --pg-bg-0: #fff;
  --pg-bg-elevated: #f8f9fa;
  --pg-bg-surface: #f1f3f4;
  --pg-bg-code: #f8f9fa;

  /* Text — dark on light */
  --pg-text: #202124;
  --pg-text-muted: #5f6368;
  --pg-text-dim: #80868b;
  --pg-text-bright: #000;

  /* Borders */
  --pg-border: #dadce0;
  --pg-border-light: #e8eaed;
  --pg-border-focus: var(--pg-primary);

  /* Semantic */
  --pg-success: #16a34a;
  --pg-warning: #d97706;
  --pg-error: #dc2626;
  --pg-info: #2563eb;

  /* Method colors */
  --pg-method-get: #16a34a;
  --pg-method-post: #0d9488;
  --pg-method-patch: #d97706;
  --pg-method-delete: #dc2626;

  /* Layout */
  --pg-max-width: 100%;
  --pg-radius: 12px;
  --pg-radius-sm: 8px;
  --pg-radius-xs: 6px;
  --pg-radius-pill: 999px;

  /* Shadows */
  --pg-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --pg-shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --pg-glow: 0 0 12px rgba(13, 148, 136, 0.15);

  /* Transitions */
  --pg-transition: 0.2s ease;
  --pg-transition-slow: 0.3s ease;
}

/* ==========================================================================
   Layout — Main Container
   ========================================================================== */

.pg-playground {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  box-sizing: border-box;
  padding: 0 2rem 2rem;
  color: var(--pg-text);
  font-family: "Google Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}

/* ==========================================================================
   Header — Mode Toggle + Title + Transport Toggle
   ========================================================================== */

.pg-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  border-bottom: 1px solid var(--pg-border);
  gap: 1rem;
}

.pg-header__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--pg-text-bright);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.pg-header__title-accent {
  color: var(--pg-primary-lighter);
}

/* ==========================================================================
   Toggles — Mode & Transport
   ========================================================================== */

/* --- Pill toggle (mode selector) --- */
.pg-mode-toggle {
  display: inline-flex;
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius-pill);
  padding: 3px;
  gap: 2px;
  flex-shrink: 0;
}

.pg-mode-toggle__option {
  padding: 0.4rem 1rem;
  border-radius: var(--pg-radius-pill);
  border: none;
  background: transparent;
  color: var(--pg-text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--pg-transition);
  white-space: nowrap;
  font-family: inherit;
}

.pg-mode-toggle__option:hover {
  color: var(--pg-text);
  background: rgba(255, 255, 255, 0.05);
}

.pg-mode-toggle__option--active {
  background: var(--pg-primary);
  color: #fff;
}

.pg-mode-toggle__option--active:hover {
  background: var(--pg-primary-dark);
  color: #fff;
}

/* --- Transport dropdown toggle --- */
.pg-transport-toggle {
  position: relative;
  flex-shrink: 0;
}

.pg-transport-toggle__select {
  appearance: none;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius-pill);
  padding: 0.4rem 2.25rem 0.4rem 1rem;
  color: var(--pg-text);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--pg-transition);
}

.pg-transport-toggle__select:hover {
  border-color: var(--pg-primary);
  background: rgba(13, 148, 136, 0.1);
}

.pg-transport-toggle__select:focus {
  outline: none;
  border-color: var(--pg-primary);
  box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.2);
}

.pg-transport-toggle__arrow {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--pg-text-muted);
  font-size: 0.7rem;
  line-height: 1;
}

/* ==========================================================================
   Stepper — Horizontal Progress Indicator
   ========================================================================== */

.pg-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 2rem;
  background: var(--pg-bg);
  border-bottom: 1px solid var(--pg-border-light);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.pg-stepper::-webkit-scrollbar {
  display: none;
}

.pg-stepper__track {
  display: flex;
  align-items: center;
  gap: 0;
  min-width: max-content;
}

/* --- Step dot --- */
.pg-step-dot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  border: 2px solid var(--pg-border);
  background: transparent;
  color: var(--pg-text-dim);
  cursor: pointer;
  transition: all var(--pg-transition);
  position: relative;
  flex-shrink: 0;
  font-family: inherit;
}

.pg-step-dot:hover {
  border-color: var(--pg-text-muted);
  color: var(--pg-text-muted);
}

/* Active step */
.pg-step-dot.pg-step-active {
  border-color: var(--pg-primary);
  background: var(--pg-primary);
  color: #fff;
  box-shadow: 0 0 0 4px rgba(13, 148, 136, 0.2);
}

/* Completed step */
.pg-step-dot.pg-step-completed {
  border-color: var(--pg-primary);
  background: var(--pg-primary);
  color: #fff;
  animation: pg-step-complete 0.3s ease;
}

.pg-step-dot.pg-step-completed::after {
  content: "";
  display: block;
  width: 10px;
  height: 6px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg);
  margin-top: -2px;
}

.pg-step-dot.pg-step-completed > span {
  display: none;
}

/* Upcoming step (default state) */
.pg-step-dot.pg-step-upcoming {
  border-color: var(--pg-border);
  background: transparent;
  color: var(--pg-text-dim);
}

/* Optional step */
.pg-step-dot.pg-step-optional {
  border-style: dashed;
  border-color: var(--pg-text-dim);
  color: var(--pg-text-dim);
}

/* --- Step connector line --- */
.pg-step-connector {
  width: 40px;
  height: 2px;
  background: var(--pg-border);
  flex-shrink: 0;
  transition: background var(--pg-transition);
}

.pg-step-connector.pg-step-connector--completed {
  background: var(--pg-primary);
}

/* --- Step label (below dot) --- */
.pg-step-label {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--pg-text-dim);
  white-space: nowrap;
  pointer-events: none;
  transition: color var(--pg-transition);
}

.pg-step-active .pg-step-label {
  color: var(--pg-primary-lighter);
}

.pg-step-completed .pg-step-label {
  color: var(--pg-text-muted);
}

/* ==========================================================================
   Content — Main Content Area
   ========================================================================== */

.pg-content {
  max-width: var(--pg-max-width);
  margin: 0 auto;
  padding: 2rem;
}

/* ==========================================================================
   Step Header
   ========================================================================== */

.pg-step-header {
  margin-bottom: 1.75rem;
}

.pg-step-header__title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--pg-text-bright);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.pg-step-header__subtitle {
  font-size: 0.95rem;
  color: var(--pg-text-muted);
  margin: 0 0 1rem;
  line-height: 1.6;
  max-width: 640px;
}

.pg-step-header__controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ==========================================================================
   Scenario Selector
   ========================================================================== */

.pg-scenario-select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius-sm);
  padding: 0.5rem 2.25rem 0.5rem 0.75rem;
  color: var(--pg-text);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--pg-transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
}

.pg-scenario-select:hover {
  border-color: var(--pg-primary);
}

.pg-scenario-select:focus {
  outline: none;
  border-color: var(--pg-primary);
  box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.2);
}

.pg-scenario-select option {
  background: var(--pg-bg-elevated);
  color: var(--pg-text);
}

/* ==========================================================================
   Code Panes — Request & Response
   ========================================================================== */

.pg-panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
  min-width: 0;
}

.pg-request-pane,
.pg-response-pane {
  border-radius: var(--pg-radius);
  border: 1px solid var(--pg-border);
  background: var(--pg-bg-code);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Response pane — initially hidden, slides in */
.pg-response-pane {
  opacity: 1;
  transform: translateY(0);
}

.pg-response-pane.pg-response-pane--hidden {
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

.pg-response-pane.pg-response-pane--visible {
  animation: pg-slide-in 0.35s ease forwards;
}

/* --- Pane header --- */
.pg-pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--pg-border-light);
  gap: 0.5rem;
  min-height: 42px;
}

.pg-pane-header__left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow: hidden;
}

.pg-pane-header__path {
  font-family: "Roboto Mono", monospace;
  font-size: 0.8rem;
  color: var(--pg-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pg-pane-header__right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ==========================================================================
   Badges — Method & Status
   ========================================================================== */

.pg-method-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  border-radius: var(--pg-radius-xs);
  font-family: "Roboto Mono", monospace;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  flex-shrink: 0;
}

.pg-method-badge--get {
  background: rgba(34, 197, 94, 0.15);
  color: var(--pg-method-get);
}

.pg-method-badge--post {
  background: rgba(13, 148, 136, 0.15);
  color: var(--pg-primary-lighter);
}

.pg-method-badge--patch {
  background: rgba(245, 158, 11, 0.15);
  color: var(--pg-method-patch);
}

.pg-method-badge--delete {
  background: rgba(239, 68, 68, 0.15);
  color: var(--pg-method-delete);
}

/* --- Status badge --- */
.pg-status-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  border-radius: var(--pg-radius-xs);
  font-family: "Roboto Mono", monospace;
  font-size: 0.7rem;
  font-weight: 700;
  animation: pg-badge-pulse 0.4s ease;
}

.pg-status-badge.pg-status-2xx {
  background: rgba(34, 197, 94, 0.15);
  color: var(--pg-success);
}

.pg-status-badge.pg-status-3xx {
  background: rgba(59, 130, 246, 0.15);
  color: var(--pg-info);
}

.pg-status-badge.pg-status-4xx {
  background: rgba(245, 158, 11, 0.15);
  color: var(--pg-warning);
}

.pg-status-badge.pg-status-5xx {
  background: rgba(239, 68, 68, 0.15);
  color: var(--pg-error);
}

/* ==========================================================================
   Code Block
   ========================================================================== */

.pg-code {
  margin: 0;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--pg-text);
  background: var(--pg-bg-code);
  tab-size: 2;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--pg-border) transparent;
}

.pg-code::-webkit-scrollbar {
  height: 6px;
  width: 6px;
}

.pg-code::-webkit-scrollbar-track {
  background: transparent;
}

.pg-code::-webkit-scrollbar-thumb {
  background: var(--pg-border);
  border-radius: 3px;
}

.pg-code::-webkit-scrollbar-thumb:hover {
  background: var(--pg-text-dim);
}

/* Editable code blocks */
.pg-code-editable {
  border: 1px dashed var(--pg-border);
  border-top: none;
  border-radius: 0 0 var(--pg-radius) var(--pg-radius);
  cursor: text;
  outline: none;
}

.pg-code-editable:focus {
  border-color: var(--pg-primary);
  box-shadow: inset 0 0 0 1px rgba(13, 148, 136, 0.15);
}

/* ==========================================================================
   Syntax Highlighting — Applied via JS
   ========================================================================== */

.pg-syn-key {
  color: #94a3b8;
}

.pg-syn-string {
  color: #2dd4bf;
}

.pg-syn-number {
  color: #f59e0b;
}

.pg-syn-boolean {
  color: #22c55e;
}

.pg-syn-null {
  color: #ef4444;
}

.pg-syn-punct {
  color: #64748b;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.pg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.5rem;
  border-radius: var(--pg-radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--pg-transition);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.pg-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* --- Primary "Run" button --- */
.pg-btn-run {
  background: var(--pg-primary);
  color: #fff;
  border-color: var(--pg-primary);
}

.pg-btn-run:hover {
  background: var(--pg-primary-dark);
  border-color: var(--pg-primary-dark);
  box-shadow: var(--pg-glow);
  transform: translateY(-1px);
}

.pg-btn-run:active {
  transform: translateY(0);
  box-shadow: none;
}

/* --- Secondary "Back" button --- */
.pg-btn-back {
  background: transparent;
  color: var(--pg-text-muted);
  border-color: var(--pg-border);
}

.pg-btn-back:hover {
  color: var(--pg-text);
  border-color: var(--pg-text-muted);
  background: rgba(255, 255, 255, 0.03);
}

/* --- Small copy button --- */
.pg-btn-copy {
  padding: 0.3rem 0.5rem;
  background: transparent;
  color: var(--pg-text-dim);
  border: 1px solid transparent;
  border-radius: var(--pg-radius-xs);
  font-size: 0.7rem;
  cursor: pointer;
  transition: all var(--pg-transition);
  font-family: inherit;
}

.pg-btn-copy:hover {
  color: var(--pg-text);
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--pg-border-light);
}

.pg-btn-copy.pg-btn-copy--copied {
  color: var(--pg-success);
}

/* --- Loading state --- */
.pg-btn-loading {
  color: transparent;
  pointer-events: none;
}

.pg-btn-loading::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: pg-spin 0.6s linear infinite;
}

/* ==========================================================================
   Timing & Validation
   ========================================================================== */

.pg-timing {
  font-family: "Roboto Mono", monospace;
  font-size: 0.7rem;
  color: var(--pg-text-dim);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.pg-timing__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pg-success);
}

.pg-validation {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-radius: var(--pg-radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: 0.75rem;
}

.pg-validation--pass {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  color: var(--pg-success);
}

.pg-validation--fail {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--pg-error);
}

.pg-validation__icon {
  font-size: 1rem;
  line-height: 1;
  flex-shrink: 0;
}

.pg-validation__message {
  font-size: 0.8rem;
  line-height: 1.4;
}

/* ==========================================================================
   Navigation Footer
   ========================================================================== */

.pg-nav-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--pg-border-light);
}

.pg-prev-link,
.pg-next-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--pg-primary-lighter);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--pg-transition);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.5rem 0;
  font-family: inherit;
}

.pg-prev-link:hover,
.pg-next-link:hover {
  color: var(--pg-primary-light);
}

.pg-prev-link::before {
  content: "\2190";
  font-size: 1.1rem;
}

.pg-next-link::after {
  content: "\2192";
  font-size: 1.1rem;
}

.pg-nav-footer__spacer {
  flex: 1;
}

/* ==========================================================================
   Negotiation Step — Capability Grid
   ========================================================================== */

.pg-negotiation-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: start;
  margin: 1.5rem 0;
}

.pg-negotiation-grid__column {
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  padding: 1.25rem;
}

.pg-negotiation-grid__label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pg-text-dim);
  margin: 0 0 0.75rem;
}

.pg-negotiation-grid__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 2.5rem;
  color: var(--pg-primary-lighter);
  font-size: 1.5rem;
}

/* --- Capability list --- */
.pg-capability-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.pg-capability-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--pg-radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  font-family: "Roboto Mono", monospace;
  transition: all var(--pg-transition);
}

.pg-capability-pill--matched {
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.25);
  color: var(--pg-success);
}

.pg-capability-pill--pruned {
  background: rgba(100, 116, 139, 0.1);
  border: 1px solid rgba(100, 116, 139, 0.2);
  color: var(--pg-text-dim);
  text-decoration: line-through;
  opacity: 0.7;
}

.pg-capability-pill__icon {
  font-size: 0.65rem;
  line-height: 1;
}

/* ==========================================================================
   Manage Step — Tab Bar
   ========================================================================== */

.pg-manage-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--pg-border);
  margin-bottom: 1.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.pg-manage-tabs::-webkit-scrollbar {
  display: none;
}

.pg-manage-tab {
  padding: 0.65rem 1.25rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--pg-text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: all var(--pg-transition);
  white-space: nowrap;
  font-family: inherit;
}

.pg-manage-tab:hover {
  color: var(--pg-text);
  background: rgba(255, 255, 255, 0.02);
}

.pg-manage-tab--active {
  color: var(--pg-primary-lighter);
  border-bottom-color: var(--pg-primary);
}

/* ==========================================================================
   Animations
   ========================================================================== */

/* Response slide-in */
@keyframes pg-slide-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Loading spinner */
@keyframes pg-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Status badge pulse on appear */
@keyframes pg-badge-pulse {
  0% {
    opacity: 0;
    transform: scale(0.8);
  }
  50% {
    transform: scale(1.08);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

/* Step dot completion */
@keyframes pg-step-complete {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.25);
  }
  100% {
    transform: scale(1);
  }
}

/* Fade in */
@keyframes pg-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.pg-hidden {
  display: none !important;
}

.pg-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.pg-fade-in {
  animation: pg-fade-in 0.3s ease;
}

/* ==========================================================================
   Mobile Stepper — Current Step Indicator
   ========================================================================== */

.pg-stepper-mobile {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--pg-bg);
  border-bottom: 1px solid var(--pg-border-light);
}

.pg-stepper-mobile__prev,
.pg-stepper-mobile__next {
  background: transparent;
  border: 1px solid var(--pg-border);
  color: var(--pg-text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--pg-transition);
  font-size: 1rem;
  font-family: inherit;
}

.pg-stepper-mobile__prev:hover,
.pg-stepper-mobile__next:hover {
  border-color: var(--pg-primary);
  color: var(--pg-primary-lighter);
}

.pg-stepper-mobile__prev:disabled,
.pg-stepper-mobile__next:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.pg-stepper-mobile__current {
  text-align: center;
}

.pg-stepper-mobile__step-num {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pg-primary-lighter);
  margin-bottom: 0.15rem;
}

.pg-stepper-mobile__step-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--pg-text);
}

/* ==========================================================================
   Step Actions Row
   ========================================================================== */

.pg-step-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.pg-step-actions--center {
  justify-content: center;
}

.pg-step-actions--end {
  justify-content: flex-end;
}

/* ==========================================================================
   Info Callout
   ========================================================================== */

.pg-callout {
  display: flex;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  border-radius: var(--pg-radius-sm);
  border: 1px solid;
  margin: 1rem 0;
  font-size: 0.85rem;
  line-height: 1.55;
}

.pg-callout--info {
  background: rgba(59, 130, 246, 0.08);
  border-color: rgba(59, 130, 246, 0.2);
  color: var(--pg-info);
}

.pg-callout--tip {
  background: rgba(13, 148, 136, 0.08);
  border-color: rgba(13, 148, 136, 0.2);
  color: var(--pg-primary-lighter);
}

.pg-callout--warning {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.2);
  color: var(--pg-warning);
}

.pg-callout__icon {
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1.55;
}

/* ==========================================================================
   Annotations / Field Descriptions
   ========================================================================== */

.pg-annotations {
  margin-top: 0.75rem;
  border: 1px solid var(--pg-border-light);
  border-radius: var(--pg-radius-sm);
  overflow: hidden;
}

.pg-annotation {
  display: flex;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--pg-border-light);
  font-size: 0.78rem;
  align-items: baseline;
}

.pg-annotation:last-child {
  border-bottom: none;
}

.pg-annotation__field {
  font-family: "Roboto Mono", monospace;
  color: var(--pg-primary-lighter);
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  font-size: 0.75rem;
}

.pg-annotation__desc {
  color: var(--pg-text-muted);
  line-height: 1.45;
}

/* ==========================================================================
   Empty State / Loading State
   ========================================================================== */

.pg-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 2rem;
  text-align: center;
}

.pg-empty-state__icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  opacity: 0.4;
}

.pg-empty-state__text {
  font-size: 0.9rem;
  color: var(--pg-text-dim);
}

.pg-loading-state {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  gap: 0.75rem;
  color: var(--pg-text-muted);
  font-size: 0.9rem;
}

.pg-loading-state__spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(13, 148, 136, 0.2);
  border-top-color: var(--pg-primary);
  border-radius: 50%;
  animation: pg-spin 0.6s linear infinite;
}

/* ==========================================================================
   Responsive — Tablet (768px - 1024px)
   ========================================================================== */

@media (max-width: 1024px) {
  .pg-playground {
    padding: 0 1.5rem 1.5rem;
  }

  .pg-content {
    max-width: 100%;
    padding: 1.5rem 0;
  }

  .pg-header {
    padding: 1rem 0;
  }

  .pg-stepper {
    padding: 1.25rem 0;
  }

  .pg-step-connector {
    width: 28px;
  }

  .pg-negotiation-grid {
    gap: 1rem;
  }
}

/* ==========================================================================
   Responsive — Mobile (<768px)
   ========================================================================== */

@media (max-width: 768px) {
  .pg-playground {
    padding: 0 1rem 1.5rem;
  }

  /* Header stacks */
  .pg-header {
    flex-wrap: wrap;
    padding: 0.75rem 0;
    gap: 0.5rem;
  }

  .pg-header__title {
    order: -1;
    width: 100%;
    text-align: center;
    font-size: 0.95rem;
  }

  .pg-mode-toggle,
  .pg-transport-toggle {
    flex: 1;
  }

  .pg-mode-toggle {
    justify-content: center;
  }

  .pg-transport-toggle__select {
    width: 100%;
  }

  /* Desktop stepper hidden on mobile */
  .pg-stepper {
    display: none;
  }

  /* Mobile stepper visible */
  .pg-stepper-mobile {
    display: flex;
  }

  /* Content */
  .pg-content {
    padding: 1.25rem 0;
  }

  .pg-step-header__title {
    font-size: 1.25rem;
  }

  /* Code panes stack vertically */
  .pg-panes {
    grid-template-columns: 1fr;
  }

  .pg-code {
    font-size: 0.75rem;
    padding: 0.75rem 1rem;
  }

  /* Negotiation grid stacks */
  .pg-negotiation-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .pg-negotiation-grid__arrow {
    transform: rotate(90deg);
    padding: 0;
  }

  /* Manage tabs scroll */
  .pg-manage-tabs {
    padding: 0 0.5rem;
  }

  .pg-manage-tab {
    padding: 0.55rem 0.75rem;
    font-size: 0.8rem;
  }

  /* Nav footer */
  .pg-nav-footer {
    padding: 1rem 0;
    margin-top: 1.5rem;
  }

  .pg-prev-link,
  .pg-next-link {
    font-size: 0.8rem;
  }

  /* Step actions */
  .pg-step-actions {
    flex-wrap: wrap;
  }

  .pg-btn {
    flex: 1;
    min-width: 0;
  }
}

/* ==========================================================================
   Responsive — Small Mobile (<480px)
   ========================================================================== */

@media (max-width: 480px) {
  .pg-playground {
    padding: 0 0.75rem 1.25rem;
  }

  .pg-content {
    padding: 1rem 0;
  }

  .pg-mode-toggle__option {
    padding: 0.35rem 0.65rem;
    font-size: 0.7rem;
  }

  .pg-step-header__title {
    font-size: 1.1rem;
  }

  .pg-step-header__subtitle {
    font-size: 0.85rem;
  }

  .pg-code {
    font-size: 0.7rem;
    padding: 0.6rem 0.75rem;
  }

  .pg-pane-header {
    padding: 0.5rem 0.75rem;
  }

  .pg-method-badge,
  .pg-status-badge {
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
  }
}

/* ==========================================================================
   MkDocs Integration — Override site styles within playground
   ========================================================================== */

/* Let the playground fill the MkDocs content column */
.md-content:has(.pg-playground) .md-content__inner {
  max-width: none;
  padding: 0;
}

/* Hide TOC on playground; use full content width like UCP */
.md-container:has(.pg-playground) .md-sidebar--secondary {
  display: none;
}

.md-container:has(.pg-playground) .md-sidebar--primary {
  display: none;
}

.md-container:has(.pg-playground) .md-main__inner {
  grid-template-columns: minmax(0, 1fr);
}

.md-container:has(.pg-playground) .md-content {
  margin-left: 0;
  max-width: 100%;
}

/* Let MkDocs grid handle the layout with sidebar */
.md-main:has(.pg-playground) .md-main__inner {
  max-width: none;
}

/* Playground typography */
.pg-playground h1,
.pg-playground h2,
.pg-playground h3,
.pg-playground h4,
.pg-playground h5,
.pg-playground h6 {
  color: var(--pg-text-bright);
  margin: 0;
  border: none;
  letter-spacing: -0.01em;
}

.pg-playground a {
  color: var(--pg-primary);
  text-decoration: none;
}

.pg-playground a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Print Styles
   ========================================================================== */

@media print {
  .pg-playground {
    background: var(--pg-bg-0);
    color: #000;
  }

  .pg-header,
  .pg-stepper,
  .pg-stepper-mobile,
  .pg-nav-footer,
  .pg-btn-copy,
  .pg-mode-toggle,
  .pg-transport-toggle {
    display: none;
  }

  .pg-code {
    background: #f5f5f5;
    color: #000;
    border: 1px solid #ccc;
  }

  .pg-panes {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Template-specific overrides (flat class names used by playground.html)
   ========================================================================== */

.pg-playground h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  white-space: nowrap;
}

.pg-playground h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  border: none;
}

.pg-playground h3 {
  color: var(--pg-text);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

.pg-playground p {
  color: var(--pg-text-muted);
  margin: 0 0 1.5rem;
}

.pg-intro {
  max-width: var(--pg-max-width);
  margin: 1.5rem auto !important;
  padding: 0;
  font-size: 1rem;
}

/* Toggle buttons (used for both mode and transport) */
.pg-toggle-btn {
  padding: 0.4rem 1rem;
  border-radius: var(--pg-radius-pill);
  border: none;
  background: transparent;
  color: var(--pg-text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--pg-transition);
  white-space: nowrap;
  font-family: inherit;
}

.pg-toggle-btn:hover {
  color: var(--pg-text);
  background: rgba(0, 0, 0, 0.05);
}

.pg-toggle-active {
  background: #202124 !important;
  color: #fff !important;
}

.pg-toggle-active:hover {
  background: #3c4043 !important;
}

/* Transport toggle as inline pill group */
#pg-transport-toggle {
  display: inline-flex;
  background: var(--pg-bg-elevated);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius-pill);
  padding: 3px;
  gap: 2px;
}

/* Step navigation pills */
.pg-step-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  max-width: var(--pg-max-width);
  margin: 0 auto 2rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--pg-border);
}

.pg-step-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--pg-radius-sm);
  border: 1px solid var(--pg-border);
  background: transparent;
  color: var(--pg-text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--pg-transition);
  font-family: inherit;
}

.pg-step-pill:hover {
  border-color: var(--pg-primary);
  color: var(--pg-text);
  background: rgba(13, 148, 136, 0.08);
}

.pg-step-pill-active {
  background: #202124 !important;
  border-color: #202124 !important;
  color: #fff !important;
}

.pg-pill-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.08);
  font-size: 0.75rem;
  font-weight: 700;
}

.pg-step-pill-active .pg-pill-num {
  background: rgba(255, 255, 255, 0.25);
}

/* Step sections */
.pg-step {
  display: none;
  max-width: var(--pg-max-width);
  margin: 0 auto;
  padding: 0 0 2rem;
}

.pg-step-visible {
  display: block;
  animation: pg-fade-in 0.4s ease;
}

.pg-step-fade-in {
  animation: pg-fade-in 0.4s ease;
}

/* Split layout panes inside pg-split */
.pg-split > .pg-panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  min-width: 0;
}

@media (max-width: 900px) {
  .pg-split > .pg-panes {
    grid-template-columns: 1fr;
  }
}

.pg-negotiation-grid:not(.pg-hidden) {
  display: grid;
  max-width: var(--pg-max-width);
  margin: 0 auto 1.5rem;
}

/* Split layout: config panel + code panel */
.pg-split {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  min-width: 0;
}

@media (max-width: 768px) {
  .pg-split {
    grid-template-columns: 1fr;
  }
}

.pg-config-panel {
  background: var(--pg-bg-0);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  padding: 1.5rem;
}

.pg-config-panel label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--pg-text-muted);
  margin-bottom: 0.5rem;
}

.pg-config-desc {
  font-size: 0.85rem !important;
  color: var(--pg-text-dim) !important;
  margin: 0.75rem 0 1rem !important;
}

.pg-select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border-radius: var(--pg-radius-xs);
  border: 1px solid var(--pg-border);
  background: var(--pg-bg-0);
  color: var(--pg-text);
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
  margin-bottom: 0.75rem;
}

.pg-select:focus {
  outline: none;
  border-color: var(--pg-primary);
  box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.2);
}

/* Code panel */
.pg-code-panel {
  background: var(--pg-bg-code);
  border: 1px solid var(--pg-border);
  border-radius: var(--pg-radius);
  overflow: hidden;
  min-width: 0;
}

.pg-code-panel .pg-pane-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--pg-bg-elevated);
  border-bottom: 1px solid var(--pg-border);
}

.pg-code-panel .pg-code {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-family: "Roboto Mono", monospace;
  font-size: 0.8rem;
  line-height: 1.6;
  background: transparent;
  border: none;
  border-radius: 0;
  min-height: 120px;
  color: var(--pg-text);
}

.pg-code-panel .pg-code code {
  font-family: inherit;
  background: transparent;
  padding: 0;
  color: inherit;
}

/* Method badges */
.pg-method-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: var(--pg-radius-xs);
  font-size: 0.7rem;
  font-weight: 700;
  font-family: "Roboto Mono", monospace;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.pg-method-get  { background: rgba(22, 163, 74, 0.1); color: var(--pg-success); }
.pg-method-post { background: rgba(13, 148, 136, 0.1); color: var(--pg-primary); }
.pg-method-patch { background: rgba(217, 119, 6, 0.1); color: var(--pg-warning); }
.pg-method-delete { background: rgba(220, 38, 38, 0.1); color: var(--pg-error); }

.pg-path {
  font-family: "Roboto Mono", monospace;
  font-size: 0.8rem;
  color: var(--pg-text-muted);
  flex: 1;
}

.pg-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--pg-text-muted);
  flex: 1;
}

/* Status badges */
.pg-status-badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: var(--pg-radius-xs);
  font-size: 0.7rem;
  font-weight: 700;
  font-family: "Roboto Mono", monospace;
  margin-left: auto;
}

.pg-status-2xx { background: rgba(22, 163, 74, 0.1); color: var(--pg-success); }
.pg-status-4xx { background: rgba(220, 38, 38, 0.1); color: var(--pg-error); }

/* Buttons */
.pg-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--pg-radius-xs);
  border: none;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all var(--pg-transition);
}

.pg-btn-run {
  background: var(--pg-primary);
  color: #fff;
  width: 100%;
  margin-top: 0.5rem;
}

.pg-btn-run:hover:not(:disabled) {
  background: var(--pg-primary-dark);
  box-shadow: var(--pg-glow);
}

.pg-btn-run:disabled {
  opacity: 0.6;
  cursor: wait;
}

.pg-btn-copy {
  background: var(--pg-bg-0);
  color: var(--pg-text-muted);
  border: 1px solid var(--pg-border);
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  margin-left: auto;
}

.pg-btn-copy:hover {
  background: var(--pg-bg-elevated);
  color: var(--pg-text);
}

.pg-btn-next, .pg-btn-back {
  background: transparent;
  color: var(--pg-primary);
  border: 1px solid var(--pg-border);
  padding: 0.5rem 1rem;
}

.pg-btn-next:hover, .pg-btn-back:hover {
  border-color: var(--pg-primary);
  background: rgba(13, 148, 136, 0.08);
}

/* Step footer */
.pg-step-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--pg-border);
}

/* Syntax highlighting tokens */
.pg-tok-key  { color: #5c6370; }
.pg-tok-str  { color: #0d9488; }
.pg-tok-num  { color: #d97706; }
.pg-tok-bool { color: #16a34a; }
.pg-tok-null { color: #dc2626; }

/* Override MkDocs content width for playground */
.pg-playground .md-content__inner {
  max-width: none;
  padding: 0;
}

/* Ensure the playground fills the content area */
[data-md-component="content"] .md-content__inner:has(.pg-playground) {
  max-width: none;
  margin: 0;
  padding: 0;
}