/* ==========================================================================
   Nordic Ink & Pale Birch Design System
   Brand: MESL 机场
   Palette:
     Birch White:   #F9F8F3 (Canvas background & clean card fills)
     Blue-Black:    #253039 (Nordic ink, body text, strong headings)
     Muted Spruce:  #6E9185 (Accents, badges, primary CTA, subtle spruce green)
     Pale Wood:     #EEE8DB (Borders, structural dividers, soft panels)
   Typography:
     H1:            Medium-weight system sans-serif (59px desktop / 37px mobile)
     Section H2/H3: Light-weight Chinese sans-serif (font-weight: 300 / 400)
     Body:          17px system sans-serif, line-height 1.75
   Principles:
     Spare straight route lines, restrained reading lists, open columns.
     No neon, no card clutter, no textured wood photos.
     Subtle opacity changes only. Honor prefers-reduced-motion.
   ========================================================================== */

:root {
  --color-birch: #F9F8F3;
  --color-birch-card: #FFFFFF;
  --color-ink: #253039;
  --color-ink-muted: #4B5A66;
  --color-ink-light: #7E8D99;
  --color-spruce: #6E9185;
  --color-spruce-dark: #56766B;
  --color-spruce-light: #EBF1EF;
  --color-wood: #EEE8DB;
  --color-wood-dark: #DDD4C3;
  --color-wood-light: #F4EFE6;

  --font-h1: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-section: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --max-width: 1240px;
  --border-spare: 1px solid var(--color-wood);
  --border-ink: 1px solid var(--color-ink);
  --border-spruce: 1px solid var(--color-spruce);
}

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

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--color-ink);
  background-color: var(--color-birch);
  min-height: 100vh;
  overflow-x: hidden;
  max-width: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-ink);
  text-decoration: none;
  transition: opacity 0.2s ease, color 0.2s ease;
}

a:hover {
  color: var(--color-spruce);
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Typography Hierarchy */
h1 {
  font-family: var(--font-h1);
  font-weight: 500;
  font-size: 59px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

h2 {
  font-family: var(--font-section);
  font-weight: 300;
  font-size: 32px;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

h3 {
  font-family: var(--font-section);
  font-weight: 400;
  font-size: 21px;
  line-height: 1.4;
  color: var(--color-ink);
}

h4 {
  font-family: var(--font-section);
  font-weight: 400;
  font-size: 18px;
  line-height: 1.4;
  color: var(--color-ink);
}

p {
  margin-bottom: 1rem;
  color: var(--color-ink);
}

p:last-child {
  margin-bottom: 0;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

/* Subtle Opacity Transitions */
.fade-in {
  opacity: 1;
  transition: opacity 0.3s ease;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 16px;
  font-weight: 500;
  border-radius: 4px;
  transition: opacity 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
  text-align: center;
  cursor: pointer;
}

.btn:hover {
  opacity: 0.88;
}

.btn-primary {
  background-color: var(--color-spruce);
  color: #FFFFFF;
  border: 1px solid var(--color-spruce);
}

.btn-primary:hover {
  background-color: var(--color-spruce-dark);
  color: #FFFFFF;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-wood-dark);
}

.btn-secondary:hover {
  background-color: var(--color-wood-light);
  border-color: var(--color-ink);
  color: var(--color-ink);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* Badges & Marks */
.badge {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
  border-radius: 2px;
  background-color: var(--color-wood);
  color: var(--color-ink);
}

.badge-spruce {
  background-color: var(--color-spruce);
  color: #FFFFFF;
}

.badge-outline {
  background-color: transparent;
  border: 1px solid var(--color-wood-dark);
  color: var(--color-ink-muted);
}

/* Section Header */
.section {
  padding-top: 80px;
  padding-bottom: 80px;
  border-bottom: var(--border-spare);
}

.section-alt {
  background-color: var(--color-birch-card);
}

.section-head {
  margin-bottom: 48px;
}

.section-head.text-center {
  text-align: center;
}

.section-head .section-sub {
  margin-top: 10px;
  font-size: 17px;
  color: var(--color-ink-muted);
  max-width: 680px;
}

.section-head.text-center .section-sub {
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   Header & Mobile Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(249, 248, 243, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: var(--border-spare);
  height: 72px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

.brand-icon {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-ink);
  color: var(--color-spruce);
  font-family: var(--font-mono);
  font-size: 13px;
  border-radius: 3px;
}

.brand-tag {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-spruce);
  border: 1px solid var(--color-wood);
  padding: 2px 6px;
  border-radius: 2px;
  letter-spacing: 0.05em;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-desktop a {
  font-size: 15px;
  font-weight: 400;
  color: var(--color-ink);
  position: relative;
  padding: 6px 0;
}

.nav-desktop a:hover {
  color: var(--color-spruce);
}

.nav-desktop a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--color-spruce);
  transition: width 0.2s ease;
}

.nav-desktop a:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  padding: 0;
  cursor: pointer;
  z-index: 102;
}

.mobile-menu-btn span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-ink);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.mobile-menu-btn.is-active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.mobile-menu-btn.is-active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.is-active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-birch);
  border-top: var(--border-spare);
  padding: 24px;
  display: none;
  flex-direction: column;
  overflow-y: auto;
  z-index: 99;
}

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

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.mobile-nav-links a {
  font-size: 18px;
  font-weight: 400;
  color: var(--color-ink);
  display: block;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-wood);
}

.mobile-nav-links a:hover {
  color: var(--color-spruce);
}

/* ==========================================================================
   Hero Section (Left Copy / Right Dashboard with Spare Straight Route Lines)
   ========================================================================== */
.hero-section {
  padding-top: 70px;
  padding-bottom: 80px;
  border-bottom: var(--border-spare);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-copy {
  display: flex;
  flex-direction: column;
}

.hero-h1 {
  font-size: 59px;
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero-lead {
  font-size: 19px;
  line-height: 1.7;
  color: var(--color-ink-muted);
  margin-bottom: 32px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero-specs-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 24px;
  border-top: var(--border-spare);
}

.hero-spec-item {
  display: flex;
  flex-direction: column;
}

.hero-spec-title {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-spruce);
  margin-bottom: 4px;
}

.hero-spec-desc {
  font-size: 13px;
  color: var(--color-ink-muted);
  line-height: 1.4;
}

/* ==========================================================================
   Hero Right Dashboard: 3D Spatial Perspective & Movement System
   ========================================================================== */
.hero-dashboard-viewport {
  perspective: 1200px;
  perspective-origin: 50% 45%;
  position: relative;
  width: 100%;
}

.hero-dashboard {
  background-color: var(--color-birch-card);
  border: var(--border-spare);
  border-radius: 4px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.hero-dashboard-3d {
  transform-style: preserve-3d;
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s ease;
  animation: heroFloat3D 8s ease-in-out infinite;
  box-shadow: 
    -10px 24px 44px -12px rgba(37, 48, 57, 0.12),
    0 0 0 1px var(--color-wood);
  will-change: transform;
}

/* 3D Idle Floating Keyframes */
@keyframes heroFloat3D {
  0%, 100% {
    transform: rotateX(8deg) rotateY(-8deg) rotateZ(0.5deg) translateY(0px);
    box-shadow: 
      -10px 24px 44px -12px rgba(37, 48, 57, 0.12),
      0 0 0 1px var(--color-wood);
  }
  50% {
    transform: rotateX(12deg) rotateY(-4deg) rotateZ(1.5deg) translateY(-14px);
    box-shadow: 
      -16px 36px 58px -14px rgba(37, 48, 57, 0.16),
      0 0 0 1px var(--color-wood-dark);
  }
}

.spatial-cube-icon {
  width: 14px;
  height: 14px;
  display: inline-block;
  border: 1.2px solid var(--color-spruce);
  position: relative;
  transform: rotate(45deg);
  border-radius: 1px;
}

.spatial-cube-icon::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 4px;
  height: 4px;
  background-color: var(--color-ink);
  border-radius: 50%;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: var(--border-spare);
  margin-bottom: 20px;
  transform: translateZ(24px);
}

.dashboard-title {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--color-ink);
  font-weight: 500;
}

.dashboard-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-spruce);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-spruce);
  opacity: 0.9;
  box-shadow: 0 0 6px rgba(110, 145, 133, 0.4);
}

.dashboard-svg-wrap {
  width: 100%;
  position: relative;
  transform-style: preserve-3d;
}

.dashboard-svg {
  width: 100%;
  height: auto;
  transform: translateZ(10px);
}

/* 3D Floating Telemetry Chips positioned in 3D Space */
.floating-telemetry-chip {
  position: absolute;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid var(--color-wood-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink);
  padding: 3px 9px;
  border-radius: 2px;
  transform: translateZ(42px);
  box-shadow: 0 8px 16px -4px rgba(37, 48, 57, 0.12);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.floating-telemetry-chip::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-spruce);
}

.chip-1 {
  top: 18%;
  left: 36%;
}

.chip-2 {
  bottom: 26%;
  right: 18%;
}

/* Subtle opacity animations (honors prefers-reduced-motion) */
@keyframes subtlePulse {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 0.95; }
}

.route-pulse {
  animation: subtlePulse 4s ease-in-out infinite;
}

.dashboard-caption {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-wood-dark);
  font-size: 12px;
  color: var(--color-ink-light);
  line-height: 1.5;
  transform: translateZ(18px);
}

/* ==========================================================================
   Benefits Section: Three Open Columns
   ========================================================================== */
.benefits-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.benefit-col {
  display: flex;
  flex-direction: column;
  padding-right: 16px;
  border-right: var(--border-spare);
  transform-style: preserve-3d;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.benefit-col:hover {
  transform: translateY(-5px) translateZ(6px);
}

.benefit-col:last-child {
  border-right: none;
  padding-right: 0;
}

.benefit-num {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--color-spruce);
  margin-bottom: 16px;
}

.benefit-col h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

.benefit-desc {
  font-size: 16px;
  color: var(--color-ink-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.benefit-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

.benefit-points li {
  font-size: 14px;
  color: var(--color-ink);
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.benefit-points li::before {
  content: "—";
  color: var(--color-spruce);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Global Nodes: A Clean Directory
   ========================================================================== */
.nodes-directory {
  display: flex;
  flex-direction: column;
  border: var(--border-spare);
  border-radius: 4px;
  background-color: var(--color-birch-card);
  overflow: hidden;
}

.nodes-table-head {
  display: grid;
  grid-template-columns: 180px 140px 1fr 220px;
  gap: 16px;
  padding: 16px 24px;
  background-color: var(--color-wood-light);
  border-bottom: var(--border-spare);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--color-ink-muted);
}

.node-row {
  display: grid;
  grid-template-columns: 180px 140px 1fr 220px;
  gap: 16px;
  align-items: center;
  padding: 20px 24px;
  border-bottom: var(--border-spare);
  transition: opacity 0.2s ease;
}

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

.node-region {
  display: flex;
  flex-direction: column;
}

.node-name-cn {
  font-weight: 500;
  font-size: 16px;
  color: var(--color-ink);
}

.node-name-en {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-light);
}

.node-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-spruce);
  font-weight: 600;
}

.node-purpose {
  font-size: 15px;
  color: var(--color-ink-muted);
  line-height: 1.5;
}

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

.node-disclaimer {
  margin-top: 20px;
  padding: 16px 20px;
  border: 1px dashed var(--color-wood-dark);
  border-radius: 4px;
  background-color: var(--color-birch);
  font-size: 13px;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

/* ==========================================================================
   AI & Streaming: Broad Text-and-Diagram Spreads
   ========================================================================== */
.spread-container {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.spread-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  padding: 36px;
  background-color: var(--color-birch-card);
  border: var(--border-spare);
  border-radius: 4px;
}

.spread-card.reverse {
  grid-template-columns: 1fr 1fr;
}

.spread-content h3 {
  margin-bottom: 16px;
  font-size: 26px;
}

.spread-lead {
  font-size: 16px;
  color: var(--color-ink-muted);
  margin-bottom: 20px;
  line-height: 1.7;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

.tool-item {
  padding: 12px 14px;
  border: var(--border-spare);
  border-radius: 3px;
  background-color: var(--color-birch);
}

.tool-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.tool-role {
  font-size: 12px;
  color: var(--color-ink-muted);
  line-height: 1.4;
}

.spread-diagram {
  background-color: var(--color-birch);
  border: var(--border-spare);
  border-radius: 4px;
  padding: 24px;
}

.diagram-header {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-spruce);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
  border-bottom: 1px dashed var(--color-wood-dark);
  padding-bottom: 8px;
}

/* ==========================================================================
   Pricing Tiers (4–5 Tiers, Exactly ONE "推荐套餐")
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px 24px;
  background-color: var(--color-birch-card);
  border: var(--border-spare);
  border-radius: 4px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s ease, border-color 0.3s ease;
}

.pricing-card:hover {
  transform: translateY(-6px) rotateX(3deg) translateZ(8px);
  box-shadow: 0 16px 32px -8px rgba(37, 48, 57, 0.1);
  border-color: var(--color-spruce);
}

.pricing-card.recommended {
  border: 1.5px solid var(--color-spruce);
  background-color: #FFFFFF;
  box-shadow: 0 8px 24px rgba(110, 145, 133, 0.1);
}

.pricing-card.recommended:hover {
  transform: translateY(-8px) rotateX(4deg) translateZ(14px);
  box-shadow: 0 20px 42px -10px rgba(110, 145, 133, 0.22);
}

.recommend-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%) translateZ(20px);
  background-color: var(--color-spruce);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 3px 12px;
  border-radius: 2px;
  white-space: nowrap;
  box-shadow: 0 4px 10px rgba(110, 145, 133, 0.3);
}

.pricing-tier-name {
  font-family: var(--font-section);
  font-weight: 400;
  font-size: 20px;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.pricing-desc {
  font-size: 13px;
  color: var(--color-ink-muted);
  min-height: 38px;
  margin-bottom: 20px;
  line-height: 1.5;
}

.pricing-price-wrap {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: var(--border-spare);
}

.pricing-price {
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 600;
  color: var(--color-ink);
}

.pricing-card.recommended .pricing-price {
  color: var(--color-spruce);
}

.pricing-unit {
  font-size: 14px;
  color: var(--color-ink-muted);
}

.pricing-placeholder-tag {
  display: block;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-ink-light);
  margin-top: 4px;
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 14px;
  color: var(--color-ink);
  display: flex;
  align-items: baseline;
  gap: 8px;
  line-height: 1.45;
}

.pricing-features li::before {
  content: "•";
  color: var(--color-spruce);
}

.pricing-note {
  margin-top: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--color-ink-muted);
}

/* ==========================================================================
   Articles: Restrained Reading List (3/2/1 Columns)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background-color: var(--color-birch-card);
  border: var(--border-spare);
  border-radius: 4px;
  transform-style: preserve-3d;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.2s ease, box-shadow 0.3s ease;
}

.article-card:hover {
  border-color: var(--color-spruce);
  transform: translateY(-5px) rotateX(2.5deg) translateZ(6px);
  box-shadow: 0 14px 28px -6px rgba(37, 48, 57, 0.08);
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink-light);
}

.article-category {
  color: var(--color-spruce);
  font-weight: 500;
}

.article-title {
  font-family: var(--font-section);
  font-weight: 400;
  font-size: 18px;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-title a {
  color: var(--color-ink);
}

.article-title a:hover {
  color: var(--color-spruce);
}

.article-excerpt {
  font-size: 14px;
  color: var(--color-ink-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: var(--border-spare);
  font-size: 13px;
}

.article-link {
  font-weight: 500;
  color: var(--color-spruce);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-link:hover {
  color: var(--color-spruce-dark);
}

/* ==========================================================================
   Testimonials: Marked-Sample Feedback
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  display: flex;
  flex-direction: column;
  padding: 28px;
  background-color: var(--color-birch-card);
  border: var(--border-spare);
  border-radius: 4px;
}

.testimonial-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-spruce);
}

.testimonial-quote {
  font-size: 15px;
  color: var(--color-ink);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.testimonial-author {
  font-weight: 500;
  font-size: 15px;
  color: var(--color-ink);
}

.testimonial-label {
  font-size: 12px;
  color: var(--color-ink-light);
  margin-top: 2px;
}

/* ==========================================================================
   FAQ Section: Accordion
   ========================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  border: var(--border-spare);
  border-radius: 4px;
  background-color: var(--color-birch-card);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 17px;
  font-weight: 500;
  color: var(--color-ink);
  text-align: left;
  background-color: transparent;
  transition: opacity 0.2s ease, background-color 0.2s ease;
}

.faq-question:hover {
  background-color: var(--color-wood-light);
}

.faq-indicator {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--color-spruce);
  font-weight: 300;
  line-height: 1;
  transition: transform 0.2s ease;
}

.faq-question[aria-expanded="true"] .faq-indicator {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 24px 24px 24px;
  font-size: 15px;
  color: var(--color-ink-muted);
  line-height: 1.75;
}

.faq-answer.is-open {
  display: block;
}

/* ==========================================================================
   Article Pages Specific Styles (Reading Layout)
   ========================================================================== */
.article-header,
.article-header-section {
  padding-top: 50px;
  padding-bottom: 40px;
  border-bottom: var(--border-spare);
  background-color: var(--color-wood-light);
}

.breadcrumb-nav {
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--color-ink-light);
}

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

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

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-wood-dark);
}

.article-page-h1 {
  font-size: 38px;
  line-height: 1.25;
  margin-bottom: 16px;
  font-weight: 500;
}

.article-meta-bar,
.article-page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-ink-light);
  margin-top: 14px;
}

.article-content-layout,
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding-top: 48px;
  padding-bottom: 80px;
}

.article-main-body,
.article-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-ink);
}

.article-main-body h1,
.article-content h1 {
  font-size: 38px;
  line-height: 1.25;
  margin-bottom: 16px;
  font-weight: 500;
}

.article-main-body h2,
.article-content h2 {
  font-size: 26px;
  margin-top: 44px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: var(--border-spare);
  font-weight: 400;
}

.article-main-body h3,
.article-content h3 {
  font-size: 20px;
  margin-top: 32px;
  margin-bottom: 16px;
  font-weight: 500;
}

.article-main-body p,
.article-content p {
  margin-bottom: 22px;
}

.article-main-body ul, .article-main-body ol,
.article-content ul, .article-content ol {
  margin-bottom: 24px;
  padding-left: 28px;
}

.article-main-body li,
.article-content li {
  margin-bottom: 10px;
}

.blueprint-sheet {
  background-color: var(--color-birch-card);
  border: var(--border-spare);
  border-radius: 4px;
  margin: 28px 0;
  overflow: hidden;
}

.sheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background-color: var(--color-wood-light);
  border-bottom: var(--border-spare);
  font-family: var(--font-mono);
  font-size: 12px;
}

.sheet-title {
  color: var(--color-ink);
  font-weight: 600;
}

.sheet-code {
  color: var(--color-spruce);
}

.article-callout,
blockquote {
  padding: 20px 24px;
  background-color: var(--color-wood-light);
  border-left: 3px solid var(--color-spruce);
  border-radius: 2px;
  margin: 28px 0;
  font-size: 16px;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  background-color: var(--color-birch-card);
  border: var(--border-spare);
}

.article-table th {
  background-color: var(--color-wood-light);
  padding: 12px 16px;
  text-align: left;
  border: var(--border-spare);
  font-weight: 500;
  font-size: 14px;
}

.article-table td {
  padding: 12px 16px;
  border: var(--border-spare);
  line-height: 1.6;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.sidebar-block,
.sidebar-box {
  padding: 24px;
  background-color: var(--color-birch-card);
  border: var(--border-spare);
  border-radius: 4px;
}

.sidebar-heading,
.sidebar-title {
  font-size: 17px;
  font-weight: 500;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: var(--border-spare);
  color: var(--color-ink);
}

.sidebar-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-links a {
  font-size: 14px;
  color: var(--color-ink-muted);
  line-height: 1.5;
  display: block;
}

.sidebar-links a:hover {
  color: var(--color-spruce);
}

.sidebar-links a:hover {
  color: var(--color-spruce);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-ink);
  color: #FFFFFF;
  padding-top: 64px;
  padding-bottom: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.site-footer a {
  color: #C2D0D8;
}

.site-footer a:hover {
  color: #FFFFFF;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-title {
  font-size: 18px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 14px;
  color: #9BAAB5;
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-heading {
  font-size: 14px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  color: #FFFFFF;
  text-transform: uppercase;
  margin-bottom: 18px;
}

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

.footer-links a {
  font-size: 14px;
  line-height: 1.5;
}

.footer-featured-link {
  color: #A3C9BE !important;
  font-weight: 500;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 13px;
  color: #8394A1;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-disclaimer {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  font-size: 12px;
  color: #6C7E8B;
  line-height: 1.7;
}

/* ==========================================================================
   Prefers-reduced-motion: reduce
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero-dashboard-3d {
    animation: none !important;
    transform: none !important;
  }
  .pricing-card, .article-card, .benefit-col {
    transform: none !important;
  }
}

/* ==========================================================================
   Responsive Breakpoints:
   375px, 390px, 430px, 768px, 1024px, 1440px
   ========================================================================== */

/* Tablet & Smaller (<= 1024px) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .benefits-columns {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .benefit-col {
    padding-right: 0;
    border-right: none;
    border-bottom: var(--border-spare);
    padding-bottom: 28px;
  }

  .benefit-col:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .nodes-table-head, .node-row {
    grid-template-columns: 140px 100px 1fr 180px;
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

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

  .testimonials-grid {
    grid-template-columns: 1fr 1fr;
  }

  .spread-card, .spread-card.reverse {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .article-layout,
  .article-content-layout {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* Mobile & Small Tablet (<= 768px) */
@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  .hero-dashboard-viewport {
    perspective: 800px;
  }

  .hero-dashboard-3d {
    animation: heroFloat3DMobile 6s ease-in-out infinite;
  }

  @keyframes heroFloat3DMobile {
    0%, 100% {
      transform: rotateX(4deg) rotateY(-3deg) translateY(0px);
    }
    50% {
      transform: rotateX(6deg) rotateY(-1deg) translateY(-6px);
    }
  }

  .floating-telemetry-chip {
    font-size: 9px;
    padding: 2px 6px;
  }

  .nav-desktop {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero-h1 {
    font-size: 37px;
    line-height: 1.2;
  }

  h2 {
    font-size: 26px;
  }

  .hero-lead {
    font-size: 17px;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-specs-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .nodes-table-head {
    display: none;
  }

  .node-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 16px;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .spread-card {
    padding: 20px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Extra Small Mobile (<= 430px) */
@media (max-width: 430px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-h1 {
    font-size: 34px;
  }

  .hero-specs-row {
    grid-template-columns: 1fr;
  }
}