/**
 * Pólya SDLC Coder UI Components
 * Source: DESIGN.md & Apple Web Design Standards
 */

/* ==========================================================================
   0. WCAG 2.1 AA Accessibility Utilities
   ========================================================================== */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--spacing-md);
  background: var(--color-primary);
  color: #ffffff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  z-index: 9999;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: var(--spacing-sm);
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--color-primary-focus, #0071e3);
  outline-offset: 2px;
}

/* ==========================================================================
   1. Two-Row Navigation Seam
   ========================================================================== */

/* 44px Global Nav (Pure Black) */
.global-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--height-global-nav);
  background-color: var(--color-surface-black);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.global-nav-container {
  max-width: var(--container-showcase-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.global-nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-body-on-dark);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.global-nav-brand:hover {
  text-decoration: none;
  opacity: 0.9;
}

.global-nav-brand .monogram,
.global-nav-brand .nav-brand-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-xs);
  flex-shrink: 0;
  object-fit: contain;
}

.global-nav-brand .monogram {
  background-color: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 13px;
}

.global-nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.global-nav-links a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: color var(--transition-fade);
}

.global-nav-links a:hover,
.global-nav-links a.active {
  color: #ffffff;
  text-decoration: none;
}

.global-nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-toggle-btn {
  display: none;
  background: transparent;
  border: none;
  color: #ffffff;
  cursor: pointer;
  padding: var(--spacing-xs);
}

/* 52px Frosted Sub-Nav */
.sub-nav-frosted {
  position: sticky;
  top: var(--height-global-nav);
  z-index: 990;
  height: var(--height-sub-nav);
  background-color: var(--color-surface-frosted);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-hairline);
}

.sub-nav-container {
  max-width: var(--container-showcase-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sub-nav-title {
  font-family: var(--font-display);
  font-size: var(--type-tagline-size);
  font-weight: var(--type-tagline-weight);
  letter-spacing: var(--type-tagline-tracking);
  color: var(--color-ink);
  text-decoration: none;
}

.sub-nav-title:hover {
  text-decoration: none;
}

.sub-nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.sub-nav-menu a:not(.btn-primary):not(.btn-utility) {
  color: var(--color-ink-muted-80);
  font-size: 13px;
  font-weight: 400;
  text-decoration: none;
  transition: color var(--transition-fade);
}

.sub-nav-menu a:not(.btn-primary):not(.btn-utility):hover,
.sub-nav-menu a:not(.btn-primary):not(.btn-utility).active {
  color: var(--color-primary);
  text-decoration: none;
}

/* Breadcrumbs in Sub-Nav */
.breadcrumb-trail {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 13px;
  color: var(--color-ink-muted-48);
}

.breadcrumb-trail a {
  color: var(--color-ink-muted-80);
  text-decoration: none;
}

.breadcrumb-trail a:hover {
  color: var(--color-primary);
}

.breadcrumb-separator {
  color: var(--color-hairline-solid);
}

.breadcrumb-current {
  color: var(--color-ink);
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ==========================================================================
   2. Button Grammars
   ========================================================================== */

/* The Action Pill (button-primary) */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  background-color: var(--color-primary);
  color: #ffffff !important;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fade), var(--transition-press);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover, #0077ed);
  color: #ffffff !important;
  opacity: 1;
  text-decoration: none;
}

.btn-primary:active {
  transform: scale(0.95);
}

/* Sub-nav Action CTA button polish */
.sub-nav-menu .btn-primary {
  background-color: var(--color-primary);
  color: #ffffff !important;
}

.sub-nav-menu .btn-primary:hover {
  background-color: var(--color-primary-hover, #0077ed);
  color: #ffffff !important;
  text-decoration: none;
}

/* The Ghost Pill (button-secondary-pill) */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  background-color: transparent;
  color: var(--color-primary);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  padding: 9px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-primary);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-press), background-color var(--transition-fade);
}

.btn-secondary:hover {
  background-color: rgba(0, 102, 204, 0.05);
  text-decoration: none;
}

.btn-secondary:active {
  transform: scale(0.95);
}

/* Small Utility Button */
.btn-utility {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background-color: var(--color-surface-pearl);
  color: var(--color-ink);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-hairline);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-press), border-color var(--transition-fade);
}

.btn-utility:hover {
  border-color: var(--color-primary);
  text-decoration: none;
}

.btn-utility:active {
  transform: scale(0.95);
}

/* Copy Affordance Button */
.btn-copy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-shrink: 0;
  white-space: nowrap;
  background-color: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  user-select: none;
  transition: var(--transition-press), background-color var(--transition-fade), border-color var(--transition-fade), box-shadow var(--transition-fade);
}

.btn-copy svg {
  flex-shrink: 0;
}

.btn-copy:hover {
  background-color: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.3);
}

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

.btn-copy.copied {
  background-color: #10b981;
  color: #ffffff;
  border-color: #10b981;
  box-shadow: none;
}

/* ==========================================================================
   3. Full-Bleed Section Tiles
   ========================================================================== */

.product-tile {
  width: 100%;
  padding: var(--spacing-section) 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.product-tile-light {
  background-color: var(--color-canvas);
  color: var(--color-ink);
}

.product-tile-parchment {
  background-color: var(--color-canvas-parchment);
  color: var(--color-ink);
}

.product-tile-dark {
  background-color: var(--color-surface-tile-1);
  color: var(--color-body-on-dark);
}

.product-tile-dark a {
  color: var(--color-primary-on-dark);
}

.tile-container {
  width: 100%;
  max-width: var(--container-showcase-max);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.tile-container-narrow {
  width: 100%;
  max-width: var(--container-docs-max);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* ==========================================================================
   4. Hero Section & Platform Configurator
   ========================================================================== */

.hero-stack {
  text-align: center;
  max-width: 900px;
  margin: 0 auto var(--spacing-xxl) auto;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: var(--type-hero-display-size);
  font-weight: var(--type-hero-display-weight);
  line-height: var(--type-hero-display-lh);
  letter-spacing: var(--type-hero-display-tracking);
  color: var(--color-ink);
  margin-bottom: var(--spacing-md);
}

.hero-lead {
  font-size: var(--type-lead-size);
  line-height: var(--type-lead-lh);
  letter-spacing: var(--type-lead-tracking);
  color: var(--color-ink-muted-80);
  margin-bottom: var(--spacing-xl);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

/* Hero Architectural Artifact Card */
.hero-equation-card {
  margin: var(--spacing-xl) auto 0 auto;
  max-width: 680px;
  background-color: var(--color-canvas-parchment);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--elevation-product-shadow);
}

.hero-equation-pill {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: rgba(0, 102, 204, 0.08);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: var(--spacing-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero-equation-code {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--spacing-xs);
  line-height: 1.4;
}

.hero-equation-note {
  font-size: 13px;
  color: var(--color-ink-muted-48);
}

/* Platform Configurator */
.configurator-section {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  background-color: var(--color-surface-tile-2);
  border: 1px solid var(--color-hairline-dark);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--elevation-product-shadow);
  color: #ffffff;
}

.configurator-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.configurator-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
}

/* Installation Method Segmented Switcher */
.install-method-switcher {
  display: inline-flex;
  background-color: rgba(0, 0, 0, 0.45);
  border: 1px solid var(--color-hairline-dark);
  border-radius: var(--radius-pill);
  padding: 4px;
  gap: 4px;
  margin-bottom: var(--spacing-lg);
  max-width: 100%;
}

.configurator-header .install-method-switcher {
  margin-bottom: 0;
}

.method-tab {
  background: transparent;
  border: none;
  border-radius: var(--radius-pill);
  color: rgba(255, 255, 255, 0.75);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  padding: 8px 18px;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fade), var(--transition-press);
}

.method-tab:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.08);
}

.method-tab.active {
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

.method-tab:active {
  transform: scale(0.96);
}

.configurator-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
}

.configurator-chip {
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  color: rgba(255, 255, 255, 0.85);
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-press), all var(--transition-fade);
}

.configurator-chip:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

.configurator-chip:active {
  transform: scale(0.95);
}

.configurator-chip.active {
  background-color: var(--color-primary-on-dark);
  color: #000000;
  font-weight: 600;
  border-color: var(--color-primary-on-dark);
}

.terminal-command-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  background-color: var(--color-surface-tile-3);
  border: 1px solid var(--color-hairline-dark);
  border-radius: var(--radius-md);
  padding: 14px var(--spacing-lg);
  font-family: var(--font-mono);
  font-size: var(--type-code-default-size);
}

.terminal-command-box > div,
.terminal-line {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.22) transparent;
}

.terminal-command-box > div::-webkit-scrollbar,
.terminal-line::-webkit-scrollbar {
  height: 4px;
}

.terminal-command-box > div::-webkit-scrollbar-thumb,
.terminal-line::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.22);
  border-radius: 4px;
}

.terminal-prompt-symbol {
  color: #64748b;
  margin-right: 10px;
  user-select: none;
  flex-shrink: 0;
  font-weight: 600;
}

.terminal-code {
  color: #a5f3fc;
  overflow-x: auto;
  white-space: nowrap;
  flex: 1 1 auto;
  min-width: 0;
  padding: 4px 0;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.22) transparent;
}

.terminal-code::-webkit-scrollbar {
  height: 4px;
}

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

.terminal-code::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.22);
  border-radius: 4px;
}

.terminal-code::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.45);
}

/* 2-Step Installation Flow */
.install-steps-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.install-step-card {
  background-color: var(--color-surface-tile-2);
  border: 1px solid var(--color-hairline-dark);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  text-align: left;
}

.install-step-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.install-step-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background-color: rgba(41, 151, 255, 0.18);
  color: #70b8ff;
  border: 1px solid rgba(41, 151, 255, 0.35);
}

.install-step-badge-chat {
  background-color: rgba(52, 199, 89, 0.15);
  color: #4ade80;
  border-color: rgba(52, 199, 89, 0.35);
}

.install-step-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
}

.install-step-note {
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-body-muted);
  margin: 0;
  text-align: left;
}

.install-step-note code {
  background-color: rgba(255, 255, 255, 0.08);
  color: #a5f3fc;
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 12px;
}

.configurator-subhead-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.script-benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
}

.script-benefit-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-hairline-dark);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
}

/* ==========================================================================
   5. Interactive Catalog Hub (Search & Filter Seam)
   ========================================================================== */

.catalog-controls {
  max-width: 900px;
  margin: 0 auto var(--spacing-xxl) auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Pill Search Input */
.search-wrapper {
  position: relative;
  width: 100%;
}

.search-input-field {
  width: 100%;
  height: 52px;
  padding: 0 48px 0 52px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-hairline-solid);
  background-color: var(--color-canvas);
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--color-ink);
  transition: border-color var(--transition-fade), box-shadow var(--transition-fade);
}

.search-input-field:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.15);
}

.search-icon-left {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-ink-muted-48);
  pointer-events: none;
}

.search-clear-btn {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--color-ink-muted-48);
  cursor: pointer;
  padding: 4px;
  display: none;
}

.search-clear-btn.visible {
  display: block;
}

/* Phase Category Pills */
.category-filter-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-xs);
}

.filter-pill {
  background-color: var(--color-canvas-parchment);
  color: var(--color-ink-muted-80);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-press), all var(--transition-fade);
}

.filter-pill:hover {
  background-color: var(--color-surface-pearl);
  color: var(--color-primary);
}

.filter-pill:active {
  transform: scale(0.95);
}

.filter-pill.active {
  background-color: var(--color-ink);
  color: #ffffff;
  border-color: var(--color-ink);
}

/* Results Metadata Banner */
.results-meta-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--color-ink-muted-48);
  padding: 0 var(--spacing-xs);
}

/* ==========================================================================
   6. Skill Card Grid (store-utility-card)
   ========================================================================== */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-section);
}

.skill-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-decoration: none;
  color: var(--color-ink);
  box-shadow: var(--elevation-whisper-card);
  transition: var(--transition-press), border-color var(--transition-fade), transform var(--transition-fade);
  position: relative;
}

.skill-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  text-decoration: none;
}

.skill-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.skill-command-badge {
  font-family: var(--font-mono);
  font-size: var(--type-code-pill-size);
  font-weight: var(--type-code-pill-weight);
  background-color: rgba(0, 102, 204, 0.08);
  color: var(--color-primary);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  border: 1px solid rgba(0, 102, 204, 0.15);
}

.skill-phase-tag {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted-48);
}

.skill-card-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--color-ink);
  margin-bottom: var(--spacing-xs);
}

.skill-card-stage {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-muted-48);
  margin-bottom: var(--spacing-sm);
}

.skill-card-description {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-ink-muted-80);
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
}

.skill-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-divider-soft);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
}

.skill-card-footer .arrow {
  transition: transform var(--transition-fade);
}

.skill-card:hover .skill-card-footer .arrow {
  transform: translateX(4px);
}

/* Empty State Card */
.empty-state-card {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-section) var(--spacing-xl);
  background-color: var(--color-canvas-parchment);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-hairline);
}

.empty-state-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--spacing-sm);
}

.empty-state-desc {
  color: var(--color-ink-muted-80);
  margin-bottom: var(--spacing-lg);
}

/* ==========================================================================
   7. Skill Detail Reference Pages
   ========================================================================== */

.skill-detail-article {
  max-width: var(--container-docs-max);
  margin: 0 auto;
  padding: var(--spacing-xxl) var(--spacing-xl);
}

.skill-detail-header {
  margin-bottom: var(--spacing-xxl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-hairline);
}

.skill-detail-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.skill-detail-title {
  font-family: var(--font-display);
  font-size: var(--type-display-lg-size);
  font-weight: var(--type-display-lg-weight);
  line-height: var(--type-display-lg-lh);
  letter-spacing: var(--type-display-lg-tracking);
  color: var(--color-ink);
  margin-bottom: var(--spacing-sm);
}

.skill-detail-quote {
  font-size: 18px;
  font-style: italic;
  color: var(--color-ink-muted-80);
  border-left: 2px solid var(--color-primary);
  padding-left: var(--spacing-md);
  margin-top: var(--spacing-md);
}

/* Problem Triad Card */
.problem-triad-card {
  background-color: var(--color-canvas-parchment);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xxl);
  box-shadow: var(--elevation-whisper-card);
}

.triad-header {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--spacing-md);
}

.triad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.triad-item {
  background-color: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.triad-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.triad-text {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-ink-muted-80);
}

/* ==========================================================================
   The Canonical 6-Phase Pipeline Stepper
   ========================================================================== */

.pipeline-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--spacing-xxl) auto;
}

.pipeline-title {
  font-family: var(--font-display);
  font-size: var(--type-display-md-size);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--color-ink);
  margin-bottom: var(--spacing-sm);
  word-break: break-word;
}

.pipeline-desc {
  font-size: 16px;
  line-height: 1.55;
  color: var(--color-ink-muted-80);
}

.pipeline-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xxl);
}

.pipeline-phase-card {
  background-color: #ffffff;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  text-align: left;
  transition: transform var(--transition-fade), box-shadow var(--transition-fade);
}

.pipeline-phase-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--elevation-product-shadow);
}

.phase-card-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.phase-card-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.3;
  margin-bottom: 8px;
}

.phase-card-desc {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-ink-muted-80);
  margin-bottom: 14px;
  flex-grow: 1;
}

.phase-card-code {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink);
  background-color: var(--color-canvas-parchment);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xs);
  padding: 3px 8px;
}

/* Pause Rule Gate Banner */
.pause-rule-banner {
  background-color: #fef2f2;
  border: 2px solid var(--color-status-pause);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-xxl) 0;
}

.pause-rule-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: #991b1b;
  margin-bottom: var(--spacing-sm);
  flex-wrap: wrap;
}

.pause-rule-desc {
  font-size: 15px;
  line-height: 1.6;
  color: #7f1d1d;
}

/* Detailed Workflow Steps */
.workflow-step-list {
  list-style: none;
  counter-reset: workflow-counter;
  margin-bottom: var(--spacing-xxl);
}

.workflow-step-item {
  counter-increment: workflow-counter;
  position: relative;
  padding-left: 48px;
  margin-bottom: var(--spacing-xl);
}

.workflow-step-item::before {
  content: counter(workflow-counter);
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  background-color: var(--color-ink);
  color: #ffffff;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
}

.workflow-step-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--spacing-xs);
}

.workflow-step-desc {
  font-size: 15px;
  color: var(--color-ink-muted-80);
}

/* Prompt Box (Copyable) */
.prompt-box {
  background-color: var(--color-surface-tile-1);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xxl);
  box-shadow: var(--elevation-product-shadow);
  color: #ffffff;
}

.prompt-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  font-size: 13px;
  color: var(--color-body-muted);
}

.prompt-content {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: #e2e8f0;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Tables in Docs */
.docs-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-xxl);
  font-size: 14px;
}

.docs-table th, .docs-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-hairline);
}

.docs-table th {
  background-color: var(--color-canvas-parchment);
  font-weight: 600;
  color: var(--color-ink);
}

.docs-table td code {
  background-color: rgba(0, 0, 0, 0.04);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  font-size: 12px;
}

/* AI Hero Pattern Components */
.decision-matrix th:first-child {
  width: 45%;
}

.decision-matrix td:last-child {
  font-weight: 500;
  color: var(--color-ink);
}

.run-step-list {
  list-style: none;
  counter-reset: run-step;
  margin: var(--spacing-md) 0 var(--spacing-xxl) 0;
  padding: 0;
}

.run-step-list li {
  counter-increment: run-step;
  position: relative;
  padding-left: 44px;
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
  font-size: 16px;
  color: var(--color-ink);
}

.run-step-list li::before {
  content: counter(run-step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 28px;
  height: 28px;
  background-color: var(--color-canvas-parchment);
  border: 1px solid var(--color-hairline);
  color: var(--color-primary);
  border-radius: 50%;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.indicators-list {
  list-style: none;
  margin: var(--spacing-md) 0 var(--spacing-xxl) 0;
  padding: 0;
}

.indicators-list li {
  position: relative;
  padding-left: 32px;
  margin-bottom: var(--spacing-sm);
  line-height: 1.55;
  font-size: 15px;
  color: var(--color-ink-muted-80);
}

.indicators-list li::before {
  content: "✓";
  position: absolute;
  left: 6px;
  top: 0;
  color: #34c759;
  font-weight: 700;
  font-size: 16px;
}

.qa-block {
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-hairline);
  padding-bottom: var(--spacing-md);
}

.qa-question {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: var(--spacing-xs);
}

.qa-answer {
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-ink-muted-80);
}

.flow-spine {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  background-color: var(--color-surface-black);
  color: #38bdf8;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0 var(--spacing-lg) 0;
  overflow-x: auto;
}

/* Handoff Breadcrumbs */
.handoff-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-section);
  border-top: 1px solid var(--color-hairline);
}

.handoff-link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.handoff-link.next {
  align-items: flex-end;
  text-align: right;
}

.handoff-label {
  font-size: 12px;
  color: var(--color-ink-muted-48);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.handoff-target {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
}

.handoff-link:hover .handoff-target {
  text-decoration: underline;
}

/* ==========================================================================
   8. Floating Sticky Install Bar & Scannable Footer
   ========================================================================== */

.sticky-install-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 950;
  height: 64px;
  background-color: var(--color-surface-frosted);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-top: 1px solid var(--color-hairline);
  display: flex;
  align-items: center;
  transform: translateY(100%);
  transition: transform var(--transition-normal);
}

.sticky-install-bar.visible {
  transform: translateY(0);
}

.sticky-bar-container {
  width: 100%;
  max-width: var(--container-showcase-max);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sticky-bar-command {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-ink);
  background-color: rgba(0, 0, 0, 0.04);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-hairline);
}

.sticky-bar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.sticky-bar-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid var(--color-hairline);
  color: var(--color-ink-muted-80);
  cursor: pointer;
  padding: 0;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.sticky-bar-close:hover {
  background-color: var(--color-canvas-parchment);
  color: var(--color-ink);
}

.sticky-bar-close:focus-visible {
  outline: 2px solid var(--color-primary-focus, #0071e3);
  outline-offset: 2px;
}

/* 4-Column Directory Footer */
.site-footer {
  background-color: var(--color-canvas-parchment);
  color: var(--color-ink-muted-80);
  padding: var(--spacing-xxl) 0 var(--spacing-xxl) 0;
  margin-top: auto;
  border-top: 1px solid var(--color-hairline);
}

.footer-directory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-col-title {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink);
  margin-bottom: var(--spacing-sm);
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.footer-link-list a {
  color: var(--color-ink-muted-80);
  font-size: var(--type-dense-link-size);
  line-height: var(--type-dense-link-lh);
  text-decoration: none;
  transition: color var(--transition-fade);
}

.footer-link-list a:hover {
  color: var(--color-primary-blue, #0071e3);
  text-decoration: none;
}

.footer-bottom-bar {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-hairline);
  font-size: 12px;
  color: var(--color-ink-muted-48);
  line-height: 1.5;
}

.footer-quote {
  font-style: italic;
  color: var(--color-ink-muted-80);
}

/* Editorial CTA Card (Contained Rounded Showcase) */
.editorial-cta-card {
  background-color: var(--color-surface-black);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xxl) var(--spacing-xl);
  text-align: center;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.editorial-cta-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 var(--spacing-sm) 0;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.editorial-cta-subtitle {
  font-size: 16px;
  color: #94a3b8;
  max-width: 600px;
  margin: 0 0 var(--spacing-lg) 0;
  line-height: 1.6;
}

.editorial-cta-actions {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* ==========================================================================
   9. Why Pólya? Specialized Heuristic & Editorial Components
   ========================================================================== */

/* Specialized Editorial Sub-Nav Breadcrumb (Single-Line Horizontal) */
.sub-nav-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  height: 100%;
}

.sub-nav-breadcrumb-link {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--color-ink-muted-80);
  text-decoration: none;
  transition: color var(--transition-fade);
}

.sub-nav-breadcrumb-link:hover {
  color: var(--color-primary-blue);
  text-decoration: none;
}

.sub-nav-breadcrumb-sep {
  color: var(--color-hairline-solid);
  font-size: 13px;
  user-select: none;
}

.sub-nav-breadcrumb-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  line-height: 1;
}

.sub-nav-breadcrumb-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  background-color: rgba(0, 113, 227, 0.08);
  border: 1px solid rgba(0, 113, 227, 0.2);
  border-radius: var(--radius-pill); /* 9999px - true geometric capsule pill */
  color: var(--color-primary-blue);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

/* Standardized Section Header Block & Spacing Rhythm */
.section-header-block {
  margin-bottom: var(--spacing-xxl); /* 48px comfortable breathing room */
}

.section-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-blue);
  margin-bottom: var(--spacing-xs);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  line-height: 1.25;
  margin: 0 0 var(--spacing-sm) 0;
}

.section-subtitle {
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.6;
  color: var(--color-ink-muted-80);
  margin: 0;
  max-width: 760px;
}

/* Editorial Hero Header */
.editorial-hero {
  padding: var(--spacing-section) 0 var(--spacing-xl) 0;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.editorial-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-blue);
  margin-bottom: var(--spacing-md);
}

.editorial-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--color-ink);
  margin-bottom: var(--spacing-lg);
}

.editorial-lead {
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.6;
  color: var(--color-ink-muted-80);
  max-width: 720px;
  margin: 0 auto;
}

/* Book Showcase Card */
.polya-book-showcase {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--spacing-xxl);
  align-items: center;
  background-color: #ffffff;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xxl);
  margin: var(--spacing-xxl) 0;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.polya-book-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.polya-book-image {
  max-width: 100%;
  max-height: 420px;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.14);
  border: 1px solid rgba(0, 0, 0, 0.08);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}

.polya-book-image:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.2);
}

.polya-book-caption {
  margin-top: var(--spacing-md);
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-ink-muted-48);
  font-family: var(--font-mono);
  text-align: center;
}

.polya-book-caption code {
  background-color: rgba(0, 0, 0, 0.05);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  color: var(--color-ink);
  font-size: 12px;
}

.polya-book-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.polya-book-tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary-blue);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.polya-book-title {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  line-height: 1.25;
  margin: 0;
}

.polya-book-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 var(--spacing-xs) 0;
}

.polya-book-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 14px;
  background-color: #f5f5f7;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-pill); /* 9999px - true geometric capsule pill */
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-ink);
  line-height: 1.3;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.polya-book-badge:hover {
  background-color: #ededef;
  border-color: rgba(0, 0, 0, 0.14);
  transform: translateY(-1px);
}

.polya-book-badge .badge-icon {
  color: var(--color-primary-blue, #0071e3);
  flex-shrink: 0;
}

.polya-book-desc {
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-ink-muted-80);
  margin: 0;
}

/* Quote Callout Banner */
.polya-quote-banner {
  background-color: var(--color-surface-black);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xxl);
  margin: var(--spacing-xxl) 0;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.polya-quote-banner::before {
  content: "“";
  position: absolute;
  top: -20px;
  left: 24px;
  font-size: 160px;
  font-family: Georgia, serif;
  color: rgba(255, 255, 255, 0.05);
  line-height: 1;
  pointer-events: none;
}

.polya-quote-text {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.5vw, 24px);
  font-style: italic;
  line-height: 1.5;
  color: #f1f5f9;
  margin-bottom: var(--spacing-md);
  position: relative;
  z-index: 1;
}

.polya-quote-author {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-primary-blue-muted, #7dd3fc);
  position: relative;
  z-index: 1;
}

/* Historical Influence Section (Wikipedia: Minsky, Dromey, Schoenfeld) */
.influence-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.influence-card {
  background-color: #ffffff;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease;
}

.influence-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.influence-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--color-hairline);
}

.influence-year {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-primary-blue);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.influence-domain {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink-muted-48);
}

.influence-author {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
  line-height: 1.3;
}

.influence-work {
  font-size: 13px;
  font-style: italic;
  color: var(--color-ink-muted-80);
  margin: 0;
}

.influence-quote {
  font-size: 13px;
  font-style: italic;
  line-height: 1.5;
  color: var(--color-ink);
  background-color: var(--color-canvas-parchment);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  margin: 4px 0;
}

.influence-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-ink-muted-80);
  margin: 0;
}

/* Dictionary of Heuristic Banner */
.dictionary-showcase {
  background-color: var(--color-canvas-parchment);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-xxl);
  margin-top: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.dictionary-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-blue);
}

.dictionary-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
}

.dictionary-desc {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-ink-muted-80);
  margin: 0;
}

.dictionary-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: var(--spacing-xs);
}

.dictionary-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background-color: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-pill); /* 9999px - true geometric capsule pill */
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.3;
  color: var(--color-ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.dictionary-chip:hover {
  background-color: #fafafc;
  border-color: rgba(0, 0, 0, 0.16);
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}

.dictionary-chip .chip-term {
  font-weight: 600;
  color: var(--color-ink);
}

.dictionary-chip .chip-meta {
  font-size: 12px;
  font-weight: 400;
  color: var(--color-ink-muted-48);
}

/* Problem Space Editorial Spotlight (George Pólya & Cats) */
.problem-space-spotlight {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  background-color: #ffffff;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xxl);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
}

.problem-spotlight-image-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.problem-spotlight-image {
  max-width: 100%;
  max-height: 250px;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.06);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
}

.problem-spotlight-image:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.problem-spotlight-caption {
  margin-top: 10px;
  font-size: 12px;
  color: var(--color-ink-muted-48);
  font-family: var(--font-mono);
  text-align: center;
  line-height: 1.4;
}

.problem-spotlight-caption code {
  background-color: rgba(0, 0, 0, 0.05);
  padding: 1px 5px;
  border-radius: var(--radius-xs);
  color: var(--color-ink);
  font-size: 11px;
}

.problem-spotlight-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.spotlight-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary-blue);
}

.spotlight-title {
  font-family: var(--font-display);
  font-size: 19px;
  font-style: italic;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.4;
  margin: 0;
}

.spotlight-text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-ink-muted-80);
  margin: 0;
}

/* Pathology Grid: AI Failure Mode vs Pólya Cure */
.pathology-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0 var(--spacing-xxl) 0;
}

.pathology-card {
  background-color: #ffffff;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.pathology-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
}

.pathology-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-hairline);
}

.pathology-number {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-ink-muted-48);
}

.pathology-mode-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pathology-mode-tag.failure {
  background-color: #fee2e2;
  color: #991b1b;
}

.pathology-mode-tag.cure {
  background-color: #dbeafe;
  color: #1e40af;
}

.pathology-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.35;
  margin: 0;
}

.pathology-body {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-ink-muted-80);
  margin: 0;
}

.pathology-resolution {
  background-color: var(--color-canvas-parchment);
  border: 1px solid var(--color-hairline);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
}

.pathology-resolution-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pathology-resolution-desc {
  font-size: 14px;
  line-height: 1.55;
  color: var(--color-ink-muted-80);
  margin: 0;
}

/* Stage Deep-Dive Grid */
.stage-deepdive-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
  margin: var(--spacing-xl) 0 var(--spacing-xxl) 0;
}

.stage-deepdive-card {
  background-color: #ffffff;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.stage-card-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  background-color: rgba(0, 113, 227, 0.08);
  color: var(--color-primary-blue);
}

.stage-card-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
}

.stage-card-quote {
  font-style: italic;
  font-size: 14px;
  color: var(--color-ink-muted-80);
  border-left: 2px solid var(--color-hairline);
  padding-left: var(--spacing-sm);
  margin: 0;
}

.stage-card-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stage-card-list li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-ink-muted-80);
}

.stage-card-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-primary-blue);
  font-weight: 700;
}

.stage-card-skills {
  margin-top: auto;
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--color-hairline);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.stage-skill-pill,
.product-tile-dark a.stage-skill-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background-color: var(--color-canvas-parchment);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink);
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.stage-skill-pill:hover,
.product-tile-dark a.stage-skill-pill:hover {
  background-color: var(--color-primary);
  color: #ffffff;
  text-decoration: none;
}

/* ==========================================================================
   10. Mathematical Arsenal Section (Pure Editorial & Topological Layout)
   ========================================================================== */

/* The Problem Triad Topological Blueprint */
.triad-blueprint {
  background-color: #ffffff;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xxl);
  margin-top: var(--spacing-xl);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.triad-blueprint-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  padding-bottom: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-hairline);
}

.triad-blueprint-title-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.triad-blueprint-citation {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary-blue);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.triad-blueprint-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0;
}

.triad-blueprint-formula {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-ink-muted-80);
  background-color: var(--color-canvas-parchment);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.triad-flow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  position: relative;
}

.triad-stage-col {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  position: relative;
}

.triad-stage-number {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-ink-muted-48);
  letter-spacing: 0.04em;
}

.triad-stage-heading {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
}

.triad-stage-question {
  font-size: 14px;
  font-style: italic;
  line-height: 1.5;
  color: var(--color-ink-muted-80);
  margin: 0;
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--color-hairline);
}

.triad-stage-spec {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-ink);
  margin: 0;
}

/* Editorial Triptych for Concepts 2, 3, 4 */
.arsenal-triptych {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xxl);
  margin-top: var(--spacing-xxl);
}

.arsenal-triptych-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  border-top: 2px solid var(--color-ink);
  padding-top: var(--spacing-lg);
}

.arsenal-item-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary-blue);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.arsenal-item-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  line-height: 1.25;
  margin: 0;
}

.arsenal-item-lead {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-ink-muted-80);
  margin: 0;
}

.arsenal-item-quote {
  font-style: italic;
  font-size: 13px;
  line-height: 1.55;
  color: var(--color-ink);
  background-color: var(--color-canvas-parchment);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  margin: auto 0 0 0;
}