/* ===================================================================
   Gatern Research Interface - Emerald & Chalk Design System
   Palette: Chalk #FBFCF7 | Deep Emerald #145C4D | Mineral Gray #53645E | Pale Lime-Gray #EAF0E2
   Mobile First | Accessible | High Performance | Clean Hierarchy
   =================================================================== */

:root {
  --color-chalk: #FBFCF7;
  --color-chalk-soft: #F4F7EE;
  --color-emerald: #145C4D;
  --color-emerald-deep: #0D3E34;
  --color-emerald-light: #1D7A66;
  --color-emerald-subtle: #248C76;
  --color-gray: #53645E;
  --color-gray-dark: #2A3632;
  --color-gray-light: #83948E;
  --color-lime: #EAF0E2;
  --color-lime-border: #D6E0CB;
  --color-border-subtle: #E2E8D8;
  --color-card-bg: #FFFFFF;
  --color-accent: #E5832E;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", SimSun, STSong, Georgia, serif;

  --font-size-base: 17px;
  --line-height-base: 1.75;
  --container-max: 1200px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-subtle: 0 4px 16px rgba(20, 92, 77, 0.06);
  --shadow-hover: 0 10px 28px rgba(20, 92, 77, 0.12);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-chalk);
  color: var(--color-gray-dark);
  line-height: var(--line-height-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-emerald);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-emerald-deep);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-emerald-deep);
}

h1 {
  font-size: 34px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 28px;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

h3 {
  font-size: 21px;
  margin-bottom: 12px;
}

p {
  margin-bottom: 16px;
  color: var(--color-gray-dark);
}

/* Songti Pull Quote */
.pull-quote {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.8;
  color: var(--color-emerald);
  border-left: 3px solid var(--color-emerald);
  padding: 12px 0 12px 24px;
  margin: 28px 0;
  background: var(--color-lime);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Buttons and CTAs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: 1px solid transparent;
  gap: 8px;
}

.btn-primary {
  background-color: var(--color-emerald);
  color: var(--color-chalk);
  box-shadow: 0 4px 12px rgba(20, 92, 77, 0.2);
}

.btn-primary:hover {
  background-color: var(--color-emerald-deep);
  color: #FFFFFF;
  box-shadow: 0 6px 18px rgba(20, 92, 77, 0.3);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-emerald);
  border: 1.5px solid var(--color-emerald);
}

.btn-secondary:hover {
  background-color: var(--color-lime);
  color: var(--color-emerald-deep);
}

.btn-light {
  background-color: var(--color-chalk);
  color: var(--color-emerald-deep);
  border: 1px solid var(--color-lime);
}

.btn-light:hover {
  background-color: #FFFFFF;
  color: var(--color-emerald);
  box-shadow: var(--shadow-subtle);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(251, 252, 247, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background-color var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 20px;
  color: var(--color-emerald-deep);
  text-decoration: none;
}

.brand-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-emerald);
  color: var(--color-chalk);
  border-radius: var(--radius-sm);
  font-weight: 900;
  font-size: 18px;
}

.brand-tag {
  font-size: 11px;
  font-weight: 600;
  background: var(--color-lime);
  color: var(--color-emerald);
  padding: 2px 8px;
  border-radius: 20px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-links {
  display: none;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  color: var(--color-gray-dark);
  font-weight: 500;
  font-size: 15.5px;
  padding: 8px 4px;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-emerald);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-emerald);
}

.header-cta {
  display: none;
  align-items: center;
  gap: 12px;
}

/* Mobile Menu Toggle Button */
.mobile-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 32px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1002;
}

.mobile-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: var(--color-emerald-deep);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.mobile-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(10.5px) rotate(45deg);
}

.mobile-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-10.5px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-menu-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-chalk);
  padding: 28px 24px;
  display: none;
  flex-direction: column;
  gap: 20px;
  z-index: 999;
  overflow-y: auto;
  border-top: 1px solid var(--color-border-subtle);
}

.mobile-menu-drawer.is-open {
  display: flex;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-list a {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-emerald-deep);
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.mobile-drawer-cta {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Section Common Styling */
.section {
  padding: 64px 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 40px;
}

.section-badge {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-emerald);
  background-color: var(--color-lime);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.section-sub {
  font-size: 17px;
  color: var(--color-gray);
  line-height: 1.7;
}

/* Alternating Emerald Feature Band */
.emerald-band {
  background-color: var(--color-emerald);
  color: var(--color-chalk);
}

.emerald-band h2, .emerald-band h3, .emerald-band h4 {
  color: #FFFFFF;
}

.emerald-band p, .emerald-band .section-sub {
  color: #D6E8E2;
}

.emerald-band .section-badge {
  background-color: rgba(234, 240, 226, 0.2);
  color: var(--color-chalk);
  border: 1px solid rgba(234, 240, 226, 0.3);
}

/* Hero Section */
.hero-section {
  padding: 48px 0 64px;
  background: linear-gradient(180deg, var(--color-chalk) 0%, var(--color-chalk-soft) 100%);
  border-bottom: 1px solid var(--color-border-subtle);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero-content h1 {
  margin-bottom: 20px;
  color: var(--color-emerald-deep);
}

.hero-lead {
  font-size: 18px;
  color: var(--color-gray);
  line-height: 1.75;
  margin-bottom: 24px;
}

.hero-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.hero-points li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15.5px;
  color: var(--color-gray-dark);
}

.hero-points svg {
  color: var(--color-emerald);
  flex-shrink: 0;
}

/* Observatory Dashboard */
.observatory-card {
  background: #0B2B23;
  color: var(--color-chalk);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 16px 36px rgba(11, 43, 35, 0.25);
  border: 1px solid rgba(234, 240, 226, 0.15);
  position: relative;
  overflow: hidden;
}

.observatory-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(234, 240, 226, 0.15);
  padding-bottom: 14px;
  margin-bottom: 20px;
}

.observatory-title {
  font-size: 14.5px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: #B5D4C9;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.live-dot {
  width: 8px;
  height: 8px;
  background-color: #4ADE80;
  border-radius: 50%;
  display: inline-block;
}

.observatory-radar {
  width: 100%;
  height: 280px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.radar-svg {
  width: 100%;
  height: 100%;
}

/* Slow radial pulse on illustrative nodes */
@keyframes radialPulse {
  0% {
    r: 5;
    opacity: 0.8;
  }
  50% {
    r: 16;
    opacity: 0;
  }
  100% {
    r: 5;
    opacity: 0;
  }
}

.pulse-ring {
  animation: radialPulse 4s cubic-bezier(0.25, 1, 0.5, 1) infinite;
  transform-origin: center;
}

.pulse-ring-2 {
  animation: radialPulse 4s cubic-bezier(0.25, 1, 0.5, 1) 2s infinite;
}

@media (prefers-reduced-motion: reduce) {
  .pulse-ring, .pulse-ring-2 {
    animation: none !important;
  }
}

.observatory-regions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 16px;
  border-top: 1px solid rgba(234, 240, 226, 0.12);
  padding-top: 16px;
}

.region-chip {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(234, 240, 226, 0.1);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.region-chip .region-name {
  font-size: 13.5px;
  font-weight: 700;
  color: #FBFCF7;
}

.region-chip .region-spec {
  font-size: 11.5px;
  color: #9ABFB2;
}

/* Advantages Section */
.advantages-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.advantage-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.advantage-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.advantage-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background-color: var(--color-lime);
  color: var(--color-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.advantage-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--color-emerald-deep);
}

.advantage-card p {
  color: var(--color-gray);
  font-size: 15.5px;
  margin-bottom: 0;
}

/* Region Timeline (Global Nodes) */
.timeline-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin-top: 24px;
}

.timeline-track::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: rgba(234, 240, 226, 0.3);
}

.timeline-node {
  position: relative;
  padding-left: 54px;
}

.timeline-marker {
  position: absolute;
  left: 12px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-chalk);
  border: 4px solid var(--color-emerald-light);
  box-shadow: 0 0 0 3px rgba(251, 252, 247, 0.2);
}

.timeline-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(234, 240, 226, 0.18);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  backdrop-filter: blur(4px);
}

.timeline-card h3 {
  font-size: 19px;
  color: #FFFFFF;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.timeline-badge {
  font-size: 12px;
  background: rgba(234, 240, 226, 0.18);
  color: var(--color-chalk);
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 500;
}

.timeline-card p {
  color: #D6E8E2;
  font-size: 15px;
  margin-bottom: 8px;
}

.timeline-card .node-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.node-tag {
  font-size: 12px;
  background: rgba(0, 0, 0, 0.15);
  color: #BEE3D6;
  padding: 2px 8px;
  border-radius: 4px;
}

/* AI & Streaming Use Cases (Landscape Panels) */
.landscape-panel-container {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.landscape-panel {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-subtle);
}

.landscape-panel-header {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-lime);
  padding-bottom: 16px;
}

.landscape-panel-header h3 {
  font-size: 24px;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.usecase-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.usecase-item {
  background: var(--color-chalk-soft);
  border: 1px solid var(--color-lime-border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  transition: border-color var(--transition-fast);
}

.usecase-item:hover {
  border-color: var(--color-emerald-light);
}

.usecase-title {
  font-weight: 700;
  font-size: 16.5px;
  color: var(--color-emerald-deep);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.usecase-tag {
  font-size: 11px;
  background: var(--color-lime);
  color: var(--color-emerald);
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.usecase-item p {
  font-size: 14.5px;
  color: var(--color-gray);
  margin-bottom: 0;
  line-height: 1.6;
}

/* Pricing Tier Matrix */
.pricing-matrix-wrapper {
  overflow-x: auto;
  margin-top: 24px;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  background: var(--color-card-bg);
  box-shadow: var(--shadow-subtle);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
  text-align: left;
}

.pricing-table th, .pricing-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border-subtle);
  font-size: 15px;
}

.pricing-table th {
  background: var(--color-chalk-soft);
  font-weight: 700;
  color: var(--color-emerald-deep);
  font-size: 15.5px;
}

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

.pricing-table tr:hover td {
  background-color: rgba(234, 240, 226, 0.3);
}

.price-value {
  font-weight: 800;
  font-size: 20px;
  color: var(--color-emerald-deep);
}

.price-placeholder {
  display: inline-block;
  font-size: 12.5px;
  color: var(--color-gray);
  background: var(--color-lime);
  padding: 3px 8px;
  border-radius: 4px;
  font-style: italic;
}

.pricing-notes {
  margin-top: 14px;
  font-size: 13.5px;
  color: var(--color-gray-light);
  font-style: italic;
}

/* Article Cards Grid (3 col desktop, 2 tablet, 1 mobile) */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
}

.article-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-lime-border);
}

.article-card-cover {
  height: 140px;
  background: linear-gradient(135deg, var(--color-lime) 0%, #D4E2CA 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.article-card-cover svg {
  color: var(--color-emerald);
  opacity: 0.85;
}

.article-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-category {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-emerald);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.article-card-title {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--color-emerald-deep);
  line-height: 1.4;
}

.article-card-excerpt {
  font-size: 14.5px;
  color: var(--color-gray);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-link {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--color-emerald);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-card-link:hover {
  color: var(--color-emerald-deep);
  text-decoration: underline;
}

/* Sample Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}

.testimonial-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-quote {
  font-size: 15.5px;
  color: var(--color-gray-dark);
  line-height: 1.7;
  margin-bottom: 20px;
  position: relative;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--color-lime);
  padding-top: 14px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-lime);
  color: var(--color-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}

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

.author-name {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--color-emerald-deep);
}

.author-role {
  font-size: 12.5px;
  color: var(--color-gray-light);
}

.sample-disclaimer {
  display: inline-block;
  font-size: 11px;
  background: var(--color-lime);
  color: var(--color-emerald);
  padding: 1px 6px;
  border-radius: 4px;
  margin-bottom: 6px;
  align-self: flex-start;
}

/* Accessible FAQ Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 24px;
}

.faq-item {
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  background: var(--color-card-bg);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-lime-border);
}

.faq-summary {
  padding: 18px 22px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--color-emerald-deep);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-summary::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--color-emerald);
  transition: transform var(--transition-fast);
}

details[open] .faq-summary::after {
  content: '−';
  transform: rotate(0deg);
}

details[open] .faq-summary {
  background-color: var(--color-chalk-soft);
  border-bottom: 1px solid var(--color-border-subtle);
}

.faq-answer {
  padding: 20px 22px;
  font-size: 15.5px;
  color: var(--color-gray);
  line-height: 1.7;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* Site Footer */
.site-footer {
  background-color: #0E352C;
  color: #D6E8E2;
  padding: 60px 0 32px;
  margin-top: auto;
  border-top: 1px solid rgba(234, 240, 226, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 48px;
}

.footer-col h4 {
  font-size: 16px;
  color: #FFFFFF;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.footer-col p {
  color: #B5D4C9;
  font-size: 14.5px;
  line-height: 1.7;
}

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

.footer-links a {
  color: #B5D4C9;
  font-size: 14.5px;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: #FFFFFF;
  text-decoration: underline;
}

.pbn-links-row {
  border-top: 1px solid rgba(234, 240, 226, 0.15);
  padding: 24px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 14.5px;
  text-align: center;
}

.pbn-label {
  color: #A3C9BC;
  font-weight: 500;
}

.pbn-links-row a {
  color: #EAF0E2;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.pbn-links-row a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid rgba(234, 240, 226, 0.1);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
  font-size: 13.5px;
  color: #8CAEA2;
}

/* Article Page Specifics */
.article-header {
  padding: 48px 0 28px;
  background: var(--color-chalk-soft);
  border-bottom: 1px solid var(--color-border-subtle);
}

.breadcrumb-nav {
  margin-bottom: 16px;
  font-size: 14px;
  color: var(--color-gray-light);
}

.breadcrumb-nav a {
  color: var(--color-gray);
}

.breadcrumb-nav a:hover {
  color: var(--color-emerald);
}

.breadcrumb-nav span {
  margin: 0 8px;
}

.article-header h1 {
  font-size: 32px;
  margin-bottom: 14px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13.5px;
  color: var(--color-gray-light);
}

.article-content {
  padding: 48px 0 64px;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.article-content h2 {
  font-size: 26px;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-lime);
}

.article-content h3 {
  font-size: 20px;
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-content ul, .article-content ol {
  margin-left: 24px;
  margin-bottom: 20px;
}

.article-content li {
  margin-bottom: 8px;
  color: var(--color-gray-dark);
}

.article-callout {
  background: var(--color-lime);
  border-left: 4px solid var(--color-emerald);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

.article-callout h4 {
  font-size: 16.5px;
  color: var(--color-emerald-deep);
  margin-bottom: 6px;
}

.article-callout p:last-child {
  margin-bottom: 0;
}

.article-table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
}

.article-table th, .article-table td {
  padding: 12px 16px;
  border: 1px solid var(--color-border-subtle);
  font-size: 14.5px;
  text-align: left;
}

.article-table th {
  background: var(--color-chalk-soft);
  color: var(--color-emerald-deep);
  font-weight: 700;
}

.related-articles {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 2px dashed var(--color-border-subtle);
}

.related-articles-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 16px;
}

.related-card {
  padding: 16px;
  background: var(--color-chalk-soft);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.related-card:hover {
  background: #FFFFFF;
  border-color: var(--color-emerald-light);
}

.related-card a {
  font-weight: 600;
  color: var(--color-emerald-deep);
  display: block;
}

/* Responsive Breakpoints */
/* Tablet: 768px - 1023px */
@media (min-width: 768px) {
  .advantages-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

  .usecase-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .article-header h1 {
    font-size: 38px;
  }

  .timeline-track {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .timeline-track::before {
    display: none;
  }

  .timeline-node {
    padding-left: 0;
  }

  .timeline-marker {
    display: none;
  }
}

/* Desktop: 1024px+ */
@media (min-width: 1024px) {
  h1 {
    font-size: 51px;
  }

  .nav-links {
    display: flex;
  }

  .header-cta {
    display: flex;
  }

  .mobile-toggle {
    display: none;
  }

  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 56px;
  }

  .hero-section {
    padding: 72px 0 96px;
  }

  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .timeline-track {
    grid-template-columns: repeat(4, 1fr);
  }

  .usecase-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Large Desktop: 1440px+ */
@media (min-width: 1440px) {
  :root {
    --container-max: 1320px;
  }
}