/* ==========================================================
   QuantSpirit Blog - Modern Quantitative Finance Design System
   Cutting-edge CSS: Scroll-driven animations, glassmorphism, 
   dynamic gradients, and reactive components.
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  --bg-primary: #07090e;
  --bg-secondary: #0d111a;
  --bg-card: rgba(18, 24, 38, 0.7);
  --bg-card-hover: rgba(24, 32, 50, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 242, 254, 0.3);
  
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-cyan: #00f2fe;
  --accent-blue: #38bdf8;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  
  --gradient-alpha: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  --gradient-purple: linear-gradient(135deg, #a855f7 0%, #6366f1 100%);
  --gradient-emerald: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-amber: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.75;
  font-size: 17px;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Ambient Background Lights */
.ambient-glow-1 {
  position: fixed;
  top: -150px;
  left: 20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.08) 0%, rgba(99, 102, 241, 0.04) 50%, transparent 70%);
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
  animation: pulse-ambient 12s ease-in-out infinite alternate;
}

.ambient-glow-2 {
  position: fixed;
  top: 40%;
  right: -100px;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.07) 0%, rgba(56, 189, 248, 0.03) 50%, transparent 70%);
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
  animation: pulse-ambient 15s ease-in-out infinite alternate-reverse;
}

@keyframes pulse-ambient {
  0% { transform: scale(1) translate(0, 0); opacity: 0.7; }
  100% { transform: scale(1.15) translate(30px, 40px); opacity: 1; }
}

/* Scroll-driven Reading Progress Bar */
.scroll-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 1000;
  background: transparent;
}

.scroll-progress-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #00f2fe, #38bdf8, #818cf8, #c084fc);
  transform-origin: 0 50%;
  transform: scaleX(0);
  transition: transform 0.05s ease-out;
}

@supports (animation-timeline: scroll()) {
  .scroll-progress-bar {
    animation: scroll-fill auto linear;
    animation-timeline: scroll(root);
  }
  @keyframes scroll-fill {
    from { transform: scaleX(0); }
    to { transform: scaleX(1); }
  }
}

/* Top Navigation Bar */
.nav-header {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-icon {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  object-fit: cover;
  border: 1px solid rgba(0, 242, 254, 0.4);
  box-shadow: 0 0 14px rgba(0, 242, 254, 0.25);
}

.brand-name {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #ffffff 40%, #00f2fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  color: var(--accent-cyan);
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulse-dot-anim 2s infinite;
}

@keyframes pulse-dot-anim {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

/* Layout Container */
.article-wrapper {
  position: relative;
  max-width: 920px;
  margin: 0 auto;
  padding: 60px 24px 120px;
  z-index: 1;
}

/* Hero Section */
.hero-header {
  margin-bottom: 70px;
}

.series-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 9999px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
}

.gradient-title {
  background: linear-gradient(135deg, #ffffff 20%, #7dd3fc 60%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.22rem;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 780px;
}

.article-info-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  padding-top: 28px;
  margin-top: 28px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-muted);
}

.info-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Section Blocks */
.content-section {
  margin-bottom: 80px;
  position: relative;
}

.section-anchor {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  padding: 3px 10px;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.sub-section-title {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #e2e8f0;
  margin: 44px 0 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sub-section-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 1.1em;
  background: var(--accent-cyan);
  border-radius: 2px;
}

p {
  margin-bottom: 22px;
  color: #cbd5e1;
  font-weight: 400;
}

strong {
  color: #ffffff;
  font-weight: 600;
}

/* Glass Cards & Grid Layouts */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 28px 0;
  position: relative;
  overflow: hidden;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), 
              border-color 0.35s ease, 
              box-shadow 0.35s ease;
}

.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 36px -12px rgba(0, 242, 254, 0.12),
              0 0 0 1px rgba(0, 242, 254, 0.15);
}

.card-accent-line {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0.6;
}

/* Comparison Grid (Discretionary vs Quant) */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.compare-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px;
  transition: all 0.3s ease;
}

.compare-box.discretionary {
  border-top: 3px solid #64748b;
}

.compare-box.quant {
  border-top: 3px solid var(--accent-cyan);
  background: rgba(0, 242, 254, 0.03);
}

.compare-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.compare-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

.compare-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 4px;
}

.compare-badge.human {
  background: rgba(148, 163, 184, 0.15);
  color: #cbd5e1;
}

.compare-badge.systematic {
  background: rgba(0, 242, 254, 0.15);
  color: var(--accent-cyan);
}

.compare-list {
  list-style: none;
}

.compare-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 0.94rem;
  color: #cbd5e1;
}

.compare-list li::before {
  content: '•';
  position: absolute;
  left: 8px;
  color: var(--text-muted);
}

.compare-box.quant .compare-list li::before {
  color: var(--accent-cyan);
  content: '✦';
  font-size: 0.8rem;
  left: 4px;
}

/* The Two Engines Cards */
.engines-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.engine-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.engine-card:hover {
  transform: translateY(-3px);
}

.engine-card.smarts:hover {
  border-color: rgba(168, 85, 247, 0.4);
  box-shadow: 0 12px 30px -10px rgba(168, 85, 247, 0.2);
}

.engine-card.speed:hover {
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 12px 30px -10px rgba(56, 189, 248, 0.2);
}

.engine-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.engine-card.smarts .engine-icon {
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: #c084fc;
}

.engine-card.speed .engine-icon {
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #38bdf8;
}

.engine-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

/* Math & Formula Showcase Box */
.math-showcase {
  background: rgba(10, 14, 23, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 28px 0;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
  overflow-x: auto;
  max-width: 100%;
}

.math-formula-center {
  text-align: center;
  font-size: 1.35rem;
  padding: 16px 0;
  color: #f8fafc;
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 6px 0;
  max-width: 100%;
}

.math-breakdown {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}

.math-term {
  background: rgba(255, 255, 255, 0.03);
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.term-symbol {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.term-symbol.alpha { color: var(--accent-cyan); }
.term-symbol.beta { color: var(--accent-purple); }
.term-symbol.epsilon { color: var(--text-muted); }

.term-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Interactive Alpha vs Beta Cards */
.alpha-beta-duo {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.concept-card {
  border-radius: var(--radius-lg);
  padding: 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.concept-card.alpha-card {
  border-color: rgba(0, 242, 254, 0.3);
  background: radial-gradient(circle at top right, rgba(0, 242, 254, 0.08) 0%, var(--bg-card) 60%);
}

.concept-card.beta-card {
  border-color: rgba(168, 85, 247, 0.3);
  background: radial-gradient(circle at top right, rgba(168, 85, 247, 0.08) 0%, var(--bg-card) 60%);
}

.concept-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 14px;
}

.concept-card.alpha-card .concept-tag {
  background: rgba(0, 242, 254, 0.15);
  color: var(--accent-cyan);
}

.concept-card.beta-card .concept-tag {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
}

/* Why Pursue Alpha Pillar Grid */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.pillar-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all 0.3s ease;
}

.pillar-item:hover {
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.pillar-num {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 10px;
  background: linear-gradient(90deg, #00f2fe, #38bdf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.pillar-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.pillar-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

/* Workflow Interactive Pipeline */
.pipeline-wrapper {
  margin: 40px 0;
  position: relative;
}

.pipeline-track {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: relative;
}

.pipeline-track::before {
  content: '';
  position: absolute;
  top: 36px;
  bottom: 36px;
  left: 27px;
  width: 2px;
  background: linear-gradient(180deg, #00f2fe, #6366f1, #a855f7, #10b981);
  opacity: 0.35;
  z-index: 0;
}

.pipeline-step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}

.step-marker {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-secondary);
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.pipeline-step:hover .step-marker {
  border-color: var(--accent-cyan);
  color: #fff;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.35);
  transform: scale(1.08);
}

.step-content {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  transition: all 0.3s ease;
}

.pipeline-step:hover .step-content {
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateX(4px);
}

.step-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.step-category {
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-cyan);
}

.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.step-body {
  font-size: 0.95rem;
  color: #cbd5e1;
  line-height: 1.65;
  margin-bottom: 12px;
}

.step-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.step-chip {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 2px 10px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  color: #94a3b8;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

/* Callout Note */
.callout-box {
  background: rgba(16, 185, 129, 0.05);
  border-left: 3px solid var(--accent-emerald);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
  margin: 28px 0;
  font-size: 0.96rem;
  color: #cbd5e1;
}

.callout-title {
  font-weight: 700;
  color: #34d399;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Footer & Next Section Preview */
.article-footer {
  margin-top: 100px;
  padding-top: 40px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-nav-hint {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.next-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: var(--radius-md);
  color: var(--accent-cyan);
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  transition: all 0.3s ease;
}

.next-badge:hover {
  background: rgba(0, 242, 254, 0.16);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.25);
  transform: translateX(4px);
}

/* P-Quant vs Q-Quant Styles */
.pq-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
  margin: 34px 0;
}

.pq-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.pq-card:hover {
  transform: translateY(-4px);
}

.pq-card.p-quant {
  border-top: 4px solid var(--accent-cyan);
  background: radial-gradient(circle at top left, rgba(0, 242, 254, 0.07) 0%, var(--bg-card) 60%);
}

.pq-card.p-quant:hover {
  border-color: rgba(0, 242, 254, 0.4);
  box-shadow: 0 16px 36px -12px rgba(0, 242, 254, 0.15);
}

.pq-card.q-quant {
  border-top: 4px solid var(--accent-purple);
  background: radial-gradient(circle at top left, rgba(168, 85, 247, 0.07) 0%, var(--bg-card) 60%);
}

.pq-card.q-quant:hover {
  border-color: rgba(168, 85, 247, 0.4);
  box-shadow: 0 16px 36px -12px rgba(168, 85, 247, 0.15);
}

.pq-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.pq-symbol {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
}

.pq-card.p-quant .pq-symbol {
  background: rgba(0, 242, 254, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 242, 254, 0.3);
}

.pq-card.q-quant .pq-symbol {
  background: rgba(168, 85, 247, 0.12);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.pq-alias {
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 6px;
}

.pq-card.p-quant .pq-alias {
  background: rgba(0, 242, 254, 0.1);
  color: var(--accent-cyan);
}

.pq-card.q-quant .pq-alias {
  background: rgba(168, 85, 247, 0.1);
  color: #c084fc;
}

.pq-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.pq-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.pq-section-label {
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin: 18px 0 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.pq-stack-box {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-top: 10px;
}

.pq-stack-row {
  margin-bottom: 10px;
}

.pq-stack-row:last-child {
  margin-bottom: 0;
}

.pq-stack-type {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.pq-stack-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.pq-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.06);
  color: #e2e8f0;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* Comparison Matrix Table */
.matrix-wrapper {
  overflow-x: auto;
  margin: 32px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

.pq-matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

.pq-matrix-table th {
  padding: 16px 20px;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-subtle);
}

.pq-matrix-table th.dim-col {
  color: var(--text-muted);
  width: 25%;
}

.pq-matrix-table th.p-col {
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.05);
  width: 37.5%;
}

.pq-matrix-table th.q-col {
  color: var(--accent-purple);
  background: rgba(168, 85, 247, 0.05);
  width: 37.5%;
}

.pq-matrix-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: #cbd5e1;
  vertical-align: top;
  line-height: 1.55;
}

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

.pq-matrix-table td.dim-label {
  font-weight: 600;
  color: #fff;
  font-size: 0.88rem;
}

.pq-matrix-table td.p-cell {
  background: rgba(0, 242, 254, 0.02);
}

.pq-matrix-table td.q-cell {
  background: rgba(168, 85, 247, 0.02);
}

/* Section 3: Methodologies & Formulations */
.formulation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 28px 0;
}

.formulation-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.formulation-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 242, 254, 0.3);
  box-shadow: 0 12px 28px -10px rgba(0, 242, 254, 0.1);
}

.formulation-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(0, 242, 254, 0.1);
  color: var(--accent-cyan);
  display: inline-block;
  margin-bottom: 12px;
}

/* Strategy Spectrum Section */
.strategy-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 32px 0;
  position: relative;
  overflow: hidden;
}

.strategy-category-card.cat-a {
  border-left: 4px solid var(--accent-cyan);
  background: radial-gradient(circle at top left, rgba(0, 242, 254, 0.04) 0%, var(--bg-card) 60%);
}

.strategy-category-card.cat-b {
  border-left: 4px solid var(--accent-blue);
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.04) 0%, var(--bg-card) 60%);
}

.strategy-category-card.cat-c {
  border-left: 4px solid var(--accent-emerald);
  background: radial-gradient(circle at top left, rgba(16, 185, 129, 0.04) 0%, var(--bg-card) 60%);
}

.strategy-category-card.cat-d {
  border-left: 4px solid var(--accent-purple);
  background: radial-gradient(circle at top left, rgba(168, 85, 247, 0.04) 0%, var(--bg-card) 60%);
}

.cat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.cat-pill {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 999px;
}

.cat-a .cat-pill { background: rgba(0, 242, 254, 0.12); color: var(--accent-cyan); }
.cat-b .cat-pill { background: rgba(56, 189, 248, 0.12); color: #38bdf8; }
.cat-c .cat-pill { background: rgba(16, 185, 129, 0.12); color: #34d399; }
.cat-d .cat-pill { background: rgba(168, 85, 247, 0.12); color: #c084fc; }

.strategy-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
  font-size: 0.91rem;
}

.strategy-table th {
  padding: 12px 14px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
  text-align: left;
}

.strategy-table td {
  padding: 14px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: #cbd5e1;
  vertical-align: top;
  line-height: 1.5;
}

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

.strat-name {
  font-weight: 700;
  color: #fff;
  font-family: var(--font-sans);
}

.strat-badge {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
  display: inline-block;
  font-family: var(--font-mono);
}

.strat-badge.risk {
  background: rgba(244, 63, 94, 0.12);
  color: #fb7185;
  border: 1px solid rgba(244, 63, 94, 0.25);
}

.strat-badge.reward {
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

/* Market Making P vs Q Spectrum */
.mm-spectrum-container {
  margin: 20px 0 24px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mm-spectrum-intro {
  background: rgba(16, 185, 129, 0.05);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.6;
}

.mm-spectrum-intro strong {
  color: #fff;
}

.mm-spectrum-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

@media (max-width: 900px) {
  .mm-spectrum-grid {
    grid-template-columns: 1fr;
  }
}

.mm-spectrum-card {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.mm-spectrum-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.mm-spectrum-card.p-pillar {
  border-top: 3px solid var(--accent-cyan);
}

.mm-spectrum-card.q-pillar {
  border-top: 3px solid var(--accent-purple);
}

.mm-spectrum-card.hybrid-pillar {
  border-top: 3px solid var(--accent-emerald);
}

.mm-card-badge {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 999px;
  align-self: flex-start;
  margin-bottom: 10px;
}

.p-pillar .mm-card-badge {
  background: rgba(0, 242, 254, 0.15);
  color: var(--accent-cyan);
}

.q-pillar .mm-card-badge {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
}

.hybrid-pillar .mm-card-badge {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
}

.mm-card-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.mm-card-assets {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 10px;
}

.mm-card-desc {
  font-size: 0.85rem;
  color: #94a3b8;
  line-height: 1.55;
  flex-grow: 1;
}

.mm-card-footer {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.78rem;
  color: #cbd5e1;
}

.mm-card-footer span {
  font-weight: 600;
  color: #fff;
}

/* Tricks of the Trade Deck */
.tricks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.trick-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px;
  position: relative;
  transition: all 0.3s ease;
}

.trick-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
}

.trick-cat {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 6px;
}

.trick-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.trick-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 0;
}

/* Section 4: Evaluation & Backtesting Styles */
.traps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.trap-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-top: 3px solid var(--accent-rose);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.trap-card:hover {
  transform: translateY(-3px);
  border-color: rgba(244, 63, 94, 0.4);
  box-shadow: 0 12px 28px -10px rgba(244, 63, 94, 0.15);
}

.trap-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(244, 63, 94, 0.12);
  color: #fb7185;
  border: 1px solid rgba(244, 63, 94, 0.25);
  display: inline-block;
  margin-bottom: 12px;
}

.trap-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.trap-desc {
  font-size: 0.9rem;
  color: #cbd5e1;
  line-height: 1.6;
  margin-bottom: 0;
}

/* Drift Showcase Card */
.drift-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin: 32px 0;
  position: relative;
}

.drift-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.drift-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(245, 158, 11, 0.12);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.drift-comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.drift-item {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  padding: 18px;
}

.drift-item-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.drift-item-text {
  font-size: 0.88rem;
  color: #94a3b8;
  line-height: 1.55;
  margin-bottom: 0;
}

/* Defense Solutions Grid */
.defenses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.defense-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-top: 3px solid var(--accent-emerald);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.defense-card:hover {
  transform: translateY(-3px);
  border-color: rgba(16, 185, 129, 0.4);
  box-shadow: 0 12px 28px -10px rgba(16, 185, 129, 0.15);
}

.defense-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.25);
  display: inline-block;
  margin-bottom: 12px;
}

.defense-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.defense-desc {
  font-size: 0.9rem;
  color: #cbd5e1;
  line-height: 1.6;
  margin-bottom: 0;
}

/* Collapsible Math / Technical Deep Dive Boxes */
details.math-expandable {
  border-radius: var(--radius-md);
  margin: 24px 0;
  border: 1px solid var(--border-subtle);
  background: rgba(13, 17, 26, 0.7);
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: all 0.3s ease;
}

details.math-expandable[open] {
  background: rgba(15, 23, 42, 0.9);
  box-shadow: 0 8px 24px -6px rgba(0, 0, 0, 0.5);
}

details.math-expandable.theme-cyan {
  border-left: 4px solid var(--accent-cyan);
}
details.math-expandable.theme-cyan[open] {
  border-color: rgba(0, 242, 254, 0.35);
  border-left-color: var(--accent-cyan);
}

details.math-expandable.theme-purple {
  border-left: 4px solid var(--accent-purple);
}
details.math-expandable.theme-purple[open] {
  border-color: rgba(168, 85, 247, 0.35);
  border-left-color: var(--accent-purple);
}

details.math-expandable.theme-emerald {
  border-left: 4px solid var(--accent-emerald);
}
details.math-expandable.theme-emerald[open] {
  border-color: rgba(16, 185, 129, 0.35);
  border-left-color: var(--accent-emerald);
}

details.math-expandable.theme-amber {
  border-left: 4px solid var(--accent-amber);
}
details.math-expandable.theme-amber[open] {
  border-color: rgba(245, 158, 11, 0.35);
  border-left-color: var(--accent-amber);
}

summary.math-expandable-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.96rem;
  color: #f1f5f9;
  user-select: none;
  list-style: none;
  transition: background 0.2s ease;
}

summary.math-expandable-summary::-webkit-details-marker {
  display: none;
}

summary.math-expandable-summary:hover {
  background: rgba(255, 255, 255, 0.03);
}

.summary-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.summary-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
}

.theme-cyan .summary-badge { background: rgba(0, 242, 254, 0.12); color: var(--accent-cyan); }
.theme-purple .summary-badge { background: rgba(168, 85, 247, 0.12); color: #c084fc; }
.theme-emerald .summary-badge { background: rgba(16, 185, 129, 0.12); color: #34d399; }
.theme-amber .summary-badge { background: rgba(245, 158, 11, 0.12); color: #fbbf24; }

.summary-chevron {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

details[open] .summary-chevron {
  transform: rotate(90deg);
  color: #fff;
}

.math-expandable-content {
  padding: 0 22px 22px;
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.65;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 18px;
}

/* Responsive queries */
@media (max-width: 768px) {
  .article-wrapper {
    padding: 40px 18px 80px;
  }
  .pipeline-track::before {
    left: 20px;
  }
  .step-marker {
    width: 42px;
    height: 42px;
    font-size: 0.85rem;
    border-radius: 12px;
  }
  .pipeline-step {
    gap: 16px;
  }
  .glass-card {
    padding: 22px;
  }
}

/* References & Citations Section */
.references-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border-subtle);
}

.references-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.references-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.reference-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.55;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  transition: all 0.2s ease;
}

.reference-item:hover {
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateX(2px);
}

.ref-num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-cyan);
  font-size: 0.78rem;
  padding-top: 1px;
}

.ref-content {
  flex-grow: 1;
}

.ref-content strong {
  color: #fff;
}

.ref-content em {
  color: #93c5fd;
  font-style: italic;
}

/* ======================================================= */
/* SECTION 5: PORTFOLIO CONSTRUCTION & RISK STYLES         */
/* ======================================================= */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 28px 0;
}

.portfolio-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  transition: all 0.3s ease;
}

.portfolio-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
}

.portfolio-badge {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 999px;
  display: inline-block;
  margin-bottom: 12px;
}

.portfolio-badge.opt { background: rgba(0, 242, 254, 0.12); color: var(--accent-cyan); }
.portfolio-badge.cov { background: rgba(168, 85, 247, 0.12); color: #c084fc; }
.portfolio-badge.factor { background: rgba(245, 158, 11, 0.12); color: #fbbf24; }
.portfolio-badge.tail { background: rgba(244, 63, 94, 0.12); color: #fb7185; }

.portfolio-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.portfolio-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Barra Risk Decomposition Box */
.barra-breakdown-box {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 28px 0;
}

.barra-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.barra-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

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

.barra-col {
  background: rgba(2, 6, 23, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  padding: 18px;
}

.barra-col.sys { border-left: 3px solid #fbbf24; }
.barra-col.spec { border-left: 3px solid var(--accent-emerald); }

.barra-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ======================================================= */
/* SECTION 6: TECH STACK & EXECUTION ARCHITECTURE STYLES    */
/* ======================================================= */
.tech-split-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 28px 0;
}

@media (max-width: 840px) {
  .tech-split-container {
    grid-template-columns: 1fr;
  }
}

.tech-split-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
}

.tech-split-card.research {
  border-top: 3px solid #38bdf8;
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.04) 0%, var(--bg-card) 70%);
}

.tech-split-card.production {
  border-top: 3px solid var(--accent-emerald);
  background: radial-gradient(circle at top left, rgba(16, 185, 129, 0.04) 0%, var(--bg-card) 70%);
}

.tech-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.tech-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
}

.tech-card-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 4px;
}

.research .tech-card-badge { background: rgba(56, 189, 248, 0.15); color: #38bdf8; }
.production .tech-card-badge { background: rgba(16, 185, 129, 0.15); color: #34d399; }

.tech-pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tech-stack-pill {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #e2e8f0;
}

/* Market Data Hierarchy Grid */
.data-tier-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 24px 0;
}

@media (max-width: 880px) {
  .data-tier-grid {
    grid-template-columns: 1fr;
  }
}

.data-tier-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
  transition: all 0.3s ease;
}

.data-tier-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.2);
}

.data-tier-level {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.data-tier-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.data-tier-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 12px;
}

.data-tier-spec {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  background: rgba(0, 0, 0, 0.35);
  padding: 8px 12px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: #94a3b8;
}

/* Latency Ladder */
.latency-ladder-container {
  margin: 28px 0;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
}

.latency-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  font-size: 0.88rem;
}

.latency-row:last-child {
  border-bottom: none;
}

.latency-scope {
  font-weight: 600;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.latency-time {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.84rem;
  padding: 2px 8px;
  border-radius: 4px;
}

.latency-time.ns { background: rgba(0, 242, 254, 0.15); color: var(--accent-cyan); }
.latency-time.us { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.latency-time.ms { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.latency-time.s { background: rgba(244, 63, 94, 0.15); color: #fb7185; }