/* ==========================================================================
   E-MAGAZINE DATA JOURNALISM STYLING: HẠ TẦNG NGẦM HÀ NỘI
   Modern, Interactive, High Contrast, Fully Responsive
   ========================================================================== */

:root {
  /* Color Palette - Subterranean Deep & Smart City Accents */
  --bg-dark: #051230;
  --bg-surface: #0e1422;
  --bg-surface-elevated: #151d30;
  --bg-surface-card: rgba(22, 32, 53, 0.7);
  --border-subtle: rgba(148, 163, 184, 0.15);
  --border-glow: rgba(6, 182, 212, 0.35);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #ffffff;

  --accent-cyan: #06b6d4;
  --accent-cyan-light: #22d3ee;
  --accent-cyan-glow: rgba(6, 182, 212, 0.25);

  --accent-amber: #f59e0b;
  --accent-amber-light: #fbbf24;
  --accent-amber-glow: rgba(245, 158, 11, 0.25);

  --accent-emerald: #10b981;
  --accent-blue: #3b82f6;

  /* Typography */
  --font-serif: "Newsreader", "Merriweather", Georgia, serif;
  --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", Consolas, monospace;

  /* Base Spacing & Sizing - Wide Canvas Editorial */
  --site-max-width: 1360px;
  --article-reading-width: 780px;
  --infographic-width: 1260px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 18px;
  /* Desktop base font size >= 16px */
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(6, 182, 212, 0.12), transparent 70%),
    radial-gradient(ellipse 60% 40% at 90% 40%, rgba(59, 130, 246, 0.08), transparent 70%),
    radial-gradient(ellipse 70% 50% at 10% 80%, rgba(245, 158, 11, 0.06), transparent 70%),
    var(--bg-dark);
}

/* Reading Progress Bar (Ultra Sleek) */
.reading-progress-track {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(15, 23, 42, 0.8);
  z-index: 1000;
  backdrop-filter: blur(8px);
}

.reading-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-amber-light));
  box-shadow: 0 0 14px var(--accent-cyan);
  transition: width 0.1s cubic-bezier(0.1, 0.5, 0.5, 1);
}

/* Subtle Top Header Badge (Clean, No Complex Menu) */
.editorial-topbar {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 20px;
  background: rgba(14, 20, 34, 0.75);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  backdrop-filter: blur(16px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.editorial-topbar .live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.4;
    transform: scale(1.3);
  }
}

/* ==========================================================================
   HERO / COVER SECTION
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 120px 24px 80px;
  text-align: center;
  overflow: hidden;
}

.hero-background-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 80%);
  pointer-events: none;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(6, 182, 212, 0.12);
  border: 1px solid rgba(6, 182, 212, 0.3);
  border-radius: 999px;
  color: var(--accent-cyan-light);
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 24px;
}

.hero-title {
  max-width: 1080px;
  font-family: var(--font-sans);
  font-size: clamp(2.4rem, 5.2vw, 4.2rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin-bottom: 36px;
  text-wrap: balance;
  background: linear-gradient(180deg, #ffffff 40%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sapo-box {
  max-width: var(--article-reading-width);
  background: rgba(21, 37, 77, 0.85);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 28px 36px;
  text-align: left;
  backdrop-filter: blur(12px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.hero-sapo-box p {
  font-size: 19px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.hero-sapo-box p:last-child {
  margin-bottom: 0;
}

.hero-sapo-box p:first-child::first-letter {
  font-family: var(--font-serif);
  float: left;
  font-size: 3.6rem;
  line-height: 0.85;
  padding-right: 12px;
  padding-top: 4px;
  color: var(--accent-cyan-light);
  font-weight: 700;
}

.scroll-indicator {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
  animation: bounce-subtle 2s infinite;
}

@keyframes bounce-subtle {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(6px);
  }
}

/* ==========================================================================
   ARTICLE LAYOUT & TYPOGRAPHY
   ========================================================================== */
.article-container {
  max-width: var(--site-max-width);
  margin: 0 auto;
  padding: 0 24px 100px;
}

.article-section {
  position: relative;
  margin-bottom: 110px;
}

.section-header {
  max-width: var(--article-reading-width);
  margin: 0 auto 36px;
  position: relative;
}

.section-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-sans);
  font-size: clamp(2rem, 3.6vw, 2.8rem);
  font-weight: 800;
  line-height: 1.25;
  color: #ffffff;
  letter-spacing: -0.01em;
  position: relative;
  padding-bottom: 18px;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 72px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-cyan), transparent);
  border-radius: 2px;
}

.section-2-header .section-badge {
  color: var(--accent-amber);
}

.section-2-header .section-title::after {
  background: linear-gradient(90deg, var(--accent-amber), transparent);
}

.section-3-header .section-badge {
  color: var(--accent-emerald);
}

.section-3-header .section-title::after {
  background: linear-gradient(90deg, var(--accent-emerald), transparent);
}

.prose {
  max-width: var(--article-reading-width);
  margin: 0 auto;
}

.prose p {
  font-size: 18px;
  /* Strictly >= 16px */
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 26px;
  text-align: justify;
  text-justify: inter-word;
}

.prose p strong {
  color: #ffffff;
  font-weight: 700;
}

/* Expert Quotation Highlights */
.prose .quote-card {
  position: relative;
  background: linear-gradient(135deg, rgba(22, 32, 53, 0.75), rgba(14, 20, 34, 0.95));
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: var(--radius-md);
  padding: 30px 34px;
  margin: 36px 0;
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.quote-card.quote-cyan {
  border-left: 5px solid var(--accent-cyan);
}

.quote-card.quote-amber {
  border-left: 5px solid var(--accent-amber);
}

.quote-card.quote-emerald {
  border-left: 5px solid var(--accent-emerald);
}

.quote-card .quote-icon {
  font-size: 28px;
  color: var(--accent-cyan);
  opacity: 0.6;
  line-height: 1;
  margin-bottom: 12px;
}

.quote-card p {
  margin-bottom: 0;
  font-size: 19px;
  line-height: 1.8;
  color: #ffffff;
  font-weight: 500;
}

/* ==========================================================================
   PHOTO EDITORIAL BREAKS (No text on images, highly thematic)
   ========================================================================== */
.visual-interlude {
  max-width: var(--infographic-width);
  margin: 70px auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.08);
  position: relative;
  background: var(--bg-surface);
}

.visual-interlude img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.visual-interlude:hover img {
  transform: scale(1.02);
}

.visual-caption {
  padding: 16px 24px;
  background: rgba(14, 20, 34, 0.9);
  border-top: 1px solid var(--border-subtle);
  font-size: 16px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.visual-caption .caption-tag {
  color: var(--accent-cyan);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ==========================================================================
   INFOGRAPHICS SYSTEM - STRICTLY MINIMUM 18PX FONT SIZE
   SVG, Charts, Metrics, Counters, Interactive
   ========================================================================== */
.infographic-wrapper {
  max-width: var(--infographic-width);
  margin: 65px auto;
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.95), rgba(11, 17, 29, 0.98));
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: var(--radius-xl);
  padding: 48px 56px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  position: relative;
  overflow: hidden;
}

.infographic-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 34px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 16px;
}

.infographic-header-left {
  flex: 1;
  min-width: 280px;
}

.infographic-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  /* Strictly >= 18px */
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.infographic-title {
  font-size: 24px;
  /* Strictly >= 18px */
  font-weight: 800;
  color: #ffffff;
  line-height: 1.3;
}

.infographic-meta {
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  padding: 6px 14px;
  border-radius: 6px;
  white-space: nowrap;
}

/* -------------------------------------------------------------
   INFOGRAPHIC 1: BÃI ĐỖ XE & NGHỊ QUYẾT 433
   ------------------------------------------------------------- */
.info-grid-1 {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 48px;
  align-items: stretch;
}

.donut-card {
  background: rgba(14, 20, 34, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
}

.chart-svg-container {
  position: relative;
  width: 240px;
  height: 240px;
  margin-bottom: 20px;
}

.chart-svg-container svg {
  transform: rotate(-90deg);
  width: 100%;
  height: 100%;
}

.chart-center-content {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.chart-center-value {
  font-size: 42px;
  /* Large number */
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

.chart-center-sub {
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--accent-amber);
  font-weight: 700;
  margin-top: 6px;
}

.donut-legend {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.legend-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--text-secondary);
}

.legend-row .legend-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
}

.legend-dot {
  width: 14px;
  height: 14px;
  border-radius: 4px;
}

.legend-dot.dot-amber {
  background: var(--accent-amber);
  box-shadow: 0 0 10px var(--accent-amber-glow);
}

.legend-dot.dot-muted {
  background: #334155;
}

.legend-row .legend-num {
  font-weight: 800;
  color: #ffffff;
  font-size: 19px;
}

/* Metric Cards for NQ 433 */
.metrics-stack {
  display: flex;
  flex-direction: column;
  gap: 18px;
  justify-content: space-between;
}

.metric-card {
  background: rgba(14, 20, 34, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px 28px;
  display: flex;
  align-items: center;
  gap: 24px;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.metric-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-glow);
}

.metric-icon-box {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.metric-icon-box svg {
  width: 32px;
  height: 32px;
}

.metric-details {
  flex: 1;
}

.metric-val {
  font-size: 34px;
  /* Large readable number */
  font-weight: 900;
  color: #ffffff;
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.metric-unit {
  font-size: 20px;
  /* Strictly >= 18px */
  font-weight: 700;
  color: var(--accent-cyan);
}

.metric-label {
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--text-secondary);
  margin-top: 4px;
  font-weight: 500;
}

/* -------------------------------------------------------------
   INFOGRAPHIC 2: HỆ SINH THÁI ĐA TẦNG & QUẢN TRỊ SỐ
   ------------------------------------------------------------- */
.info-section-2-container {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Multi-layer spatial cross-section interactive visual */
.layer-interactive-box {
  background: rgba(14, 20, 34, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
}

.layer-heading-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.layer-heading-title {
  font-size: 20px;
  /* >= 18px */
  font-weight: 700;
  color: #ffffff;
}

.layer-interactive-strip {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.spatial-layer {
  background: rgba(22, 32, 53, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.spatial-layer::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
}

.spatial-layer.layer-sky::before {
  background: #38bdf8;
}

.spatial-layer.layer-ground::before {
  background: #10b981;
}

.spatial-layer.layer-sub::before {
  background: var(--accent-cyan);
}

.spatial-layer:hover {
  background: rgba(30, 41, 59, 0.9);
  border-color: rgba(6, 182, 212, 0.4);
  transform: translateX(4px);
}

.layer-tag {
  min-width: 140px;
  font-size: 18px;
  /* Strictly >= 18px */
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #ffffff;
}

.layer-sky .layer-tag {
  color: #38bdf8;
}

.layer-ground .layer-tag {
  color: #10b981;
}

.layer-sub .layer-tag {
  color: var(--accent-cyan);
}

.layer-desc {
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
}

.layer-sub-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.sub-tag-pill {
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: var(--accent-cyan-light);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 18px;
  /* Strictly >= 18px */
  font-weight: 600;
}

/* 5 Digital Systems Matrix */
.digital-twin-matrix {
  background: rgba(14, 20, 34, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
}

.matrix-title-row {
  margin-bottom: 20px;
}

.matrix-title {
  font-size: 20px;
  /* >= 18px */
  font-weight: 700;
  color: #ffffff;
}

.matrix-subtitle {
  font-size: 18px;
  /* >= 18px */
  color: var(--text-muted);
  margin-top: 4px;
}

.data-systems-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-top: 22px;
}

.system-node {
  background: rgba(22, 32, 53, 0.5);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 24px 18px;
  text-align: center;
  transition: all 0.3s ease;
  cursor: default;
}

.system-node:hover {
  background: rgba(6, 182, 212, 0.1);
  border-color: var(--accent-cyan);
  transform: translateY(-4px);
}

.system-node-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
}

.system-node-icon svg {
  width: 24px;
  height: 24px;
}

.system-node-name {
  font-size: 18px;
  /* Strictly >= 18px */
  font-weight: 700;
  color: #ffffff;
  line-height: 1.3;
}

/* -------------------------------------------------------------
   INFOGRAPHIC 3: CƠ CẤU 2026-2030 & CƠ CHẾ PPP
   ------------------------------------------------------------- */
.info-grid-3 {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 48px;
  align-items: stretch;
}

.pipeline-card {
  background: rgba(14, 20, 34, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.pipeline-title {
  font-size: 20px;
  /* >= 18px */
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 22px;
}

.project-split-bars {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.split-bar-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.bar-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--text-secondary);
}

.bar-meta-title {
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.bar-count-badge {
  font-size: 20px;
  /* >= 18px */
  font-weight: 900;
  color: var(--accent-emerald);
}

.split-bar-item.ppp .bar-count-badge {
  color: var(--accent-amber);
}

.bar-track {
  width: 100%;
  height: 16px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}

.bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.bar-fill.fill-public {
  width: 0%;
  background: linear-gradient(90deg, #10b981, #34d399);
}

.bar-fill.fill-ppp {
  width: 0%;
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.bar-subdetail {
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--text-muted);
}

/* PPP Mechanism Box */
.ppp-framework-card {
  background: rgba(14, 20, 34, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px;
}

.ppp-framework-title {
  font-size: 20px;
  /* >= 18px */
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
}

.ppp-roles-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 22px;
}

.role-column {
  background: rgba(22, 32, 53, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 20px 18px;
}

.role-column.role-gov {
  border-top: 4px solid var(--accent-cyan);
}

.role-column.role-biz {
  border-top: 4px solid var(--accent-amber);
}

.role-header {
  font-size: 18px;
  /* Strictly >= 18px */
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
}

.role-gov .role-header {
  color: var(--accent-cyan-light);
}

.role-biz .role-header {
  color: var(--accent-amber-light);
}

.role-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.role-points li {
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--text-secondary);
  line-height: 1.4;
  position: relative;
  padding-left: 20px;
}

.role-points li::before {
  content: "•";
  position: absolute;
  left: 4px;
  color: var(--text-muted);
  font-size: 20px;
}

.ppp-incentives-box {
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  border-left: 3px solid var(--accent-emerald);
}

.incentives-title {
  font-size: 18px;
  /* Strictly >= 18px */
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.incentives-text {
  font-size: 18px;
  /* Strictly >= 18px */
  color: var(--text-muted);
  line-height: 1.45;
}

/* ==========================================================================
   ARTICLE FOOTER & AUTHOR CREDITS
   ========================================================================== */
.article-footer {
  max-width: var(--article-reading-width);
  margin: 80px auto 40px;
  padding-top: 36px;
  border-top: 2px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.author-block {
  display: flex;
  align-items: center;
  gap: 18px;
}

.author-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 22px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.author-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 22px;
  font-weight: 800;
  color: #ffffff;
}

.author-role {
  font-size: 16px;
  color: var(--text-muted);
}

.share-strip {
  display: flex;
  align-items: center;
  gap: 12px;
}

.share-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(22, 32, 53, 0.8);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.share-button:hover {
  background: rgba(6, 182, 212, 0.15);
  border-color: var(--accent-cyan);
  color: #ffffff;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(14, 20, 34, 0.85);
  border: 1px solid var(--border-subtle);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(8px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
  z-index: 800;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent-cyan);
  color: #000000;
  transform: translateY(-3px);
  box-shadow: 0 10px 25px var(--accent-cyan-glow);
}

/* ==========================================================================
   SCROLL ANIMATION STATES & UTILITIES
   ========================================================================== */
.fade-in-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.fade-in-up.active {
  opacity: 1;
  transform: translateY(0);
}

/* Delay helpers for staged reveals */
.delay-1 {
  transition-delay: 0.15s;
}

.delay-2 {
  transition-delay: 0.3s;
}

.delay-3 {
  transition-delay: 0.45s;
}

/* ==========================================================================
   RESPONSIVE DESIGN (Desktop, Tablet, Mobile)
   ========================================================================== */
@media (max-width: 1200px) {
  .data-systems-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .infographic-wrapper {
    padding: 40px 36px;
  }
}

@media (max-width: 1024px) {

  .info-grid-1,
  .info-grid-3 {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .infographic-wrapper {
    padding: 36px 28px;
    margin: 45px auto;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 16px;
    /* Base 16px for mobile */
  }

  .editorial-topbar {
    top: 8px;
    padding: 6px 14px;
    font-size: 14px;
  }

  .hero-section {
    padding: 100px 16px 60px;
    min-height: 85vh;
  }

  .hero-title {
    font-size: 2.1rem;
    margin-bottom: 24px;
  }

  .hero-sapo-box {
    padding: 22px 20px;
  }

  .hero-sapo-box p {
    font-size: 17px;
  }

  .article-container {
    padding: 0 16px 80px;
  }

  .article-section {
    margin-bottom: 80px;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .prose p {
    font-size: 17px;
    /* >= 16px */
    text-align: left;
  }

  .prose .quote-card {
    padding: 22px 20px;
    margin: 28px 0;
  }

  .prose .quote-card p {
    font-size: 17px;
  }

  .infographic-wrapper {
    padding: 24px 16px;
    border-radius: var(--radius-md);
  }

  .infographic-title {
    font-size: 20px;
    /* >= 18px */
  }

  .infographic-label,
  .infographic-meta {
    font-size: 18px;
    /* Strictly >= 18px */
  }

  .metric-card {
    padding: 18px 20px;
    gap: 16px;
  }

  .metric-val {
    font-size: 28px;
  }

  .metric-unit,
  .metric-label {
    font-size: 18px;
    /* Strictly >= 18px */
  }

  .spatial-layer {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 16px;
  }

  .ppp-roles-grid {
    grid-template-columns: 1fr;
  }

  .article-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}