/* ==========================================================================
   Qingyu Airport (轻语机场) - Information Design System
   Palette:
     Background:        #F6F4F1 (Warm gray paper)
     Deep Warm Gray:    #383735 (Text, dark rules, structural frames)
     Restrained Vermilion: #B85E4C (Accent, badges, primary CTA, highlights)
     Paper White:       #FFFDFC (Cards, panels, tables, elevated surfaces)
     Border Subtle:     #E5DFD7
     Border Rules:      #D8D0C5
     Muted Ink:         #6E6B67
   Typography:
     Heading (Serif):   "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", STSong, "SimSun", Georgia, serif
     Body (Sans):       system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif
   ========================================================================== */

:root {
  --bg-main: #F6F4F1;
  --bg-card: #FFFDFC;
  --bg-card-alt: #F2EFEA;
  --color-ink: #383735;
  --color-ink-muted: #6E6B67;
  --color-ink-faint: #96928C;
  --color-vermilion: #B85E4C;
  --color-vermilion-hover: #9E4B3A;
  --color-vermilion-subtle: #F7EEEA;
  --color-vermilion-border: #E0BCB4;
  --border-rule: #D8D0C5;
  --border-subtle: #E8E3DA;
  
  --font-serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", STSong, "SimSun", Georgia, serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --h1-desktop: 55px;
  --h1-mobile: 35px;
  --body-font-size: 17px;
  --line-height-body: 1.7;

  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 6px;

  --container-max: 1200px;
  --container-reading: 840px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-main);
  color: var(--color-ink);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--body-font-size);
  line-height: var(--line-height-body);
  background-color: var(--bg-main);
  color: var(--color-ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

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

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

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

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

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

/* Section Information Header */
.section-meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-vermilion);
  background-color: var(--color-vermilion-subtle);
  border: 1px solid var(--color-vermilion-border);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-ink);
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 17px;
  line-height: 1.65;
  color: var(--color-ink-muted);
  max-width: 720px;
}

.section-head {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-rule);
  padding-bottom: 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-xs);
  transition: all 0.2s ease;
  white-space: nowrap;
  text-align: center;
}

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

.btn-primary:hover {
  background-color: var(--color-vermilion-hover);
  color: #FFFDFC;
  box-shadow: 0 2px 6px rgba(184, 94, 76, 0.25);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--color-ink);
  border: 1px solid var(--border-rule);
}

.btn-secondary:hover {
  background-color: #F8F5F0;
  color: var(--color-vermilion);
  border-color: var(--color-vermilion);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 13px;
}

/* Header & Navigation */
.site-header {
  background-color: rgba(246, 244, 241, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-rule);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  display: inline-block;
  flex-shrink: 0;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-vermilion);
  border: 1px solid var(--color-vermilion-border);
  padding: 1px 5px;
  border-radius: var(--radius-xs);
  margin-left: 6px;
  font-weight: 400;
  vertical-align: middle;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink);
  position: relative;
  padding: 6px 0;
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-vermilion);
}

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

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-xs);
}

.mobile-nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-ink);
  transition: all 0.2s ease;
}

.mobile-nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.mobile-nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav Drawer */
.mobile-menu-drawer {
  display: none;
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-rule);
  padding: 20px 24px;
}

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

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mobile-nav-list a {
  font-size: 16px;
  font-weight: 500;
  display: block;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-subtle);
}

/* ==========================================================================
   Hero Section: Information Design & Network Dashboard
   ========================================================================== */
.hero-section {
  padding: 60px 0 68px;
  border-bottom: 1px solid var(--border-rule);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  padding-right: 12px;
}

.hero-meta-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-vermilion);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.hero-meta-kicker::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--color-vermilion);
  border-radius: 50%;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: var(--h1-desktop);
  font-weight: 700;
  line-height: 1.18;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  margin-bottom: 22px;
}

.hero-desc {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-ink-muted);
  margin-bottom: 30px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.hero-bullet-list {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 24px;
  font-size: 13px;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  border-top: 1px dashed var(--border-rule);
  padding-top: 18px;
}

.hero-bullet-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-bullet-item svg {
  color: var(--color-vermilion);
}

/* Hero Network Dashboard */
.network-dashboard {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
  padding: 24px;
  position: relative;
  box-shadow: 0 4px 18px rgba(56, 55, 53, 0.04);
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.dash-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dash-title-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-vermilion);
  border-radius: 50%;
}

.dash-version {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink-faint);
}

/* Annotated Network Map Diagram */
.network-map-canvas {
  width: 100%;
  height: 270px;
  position: relative;
  background-color: #FAF8F5;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  overflow: hidden;
}

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

/* Sequential Animation for Network Markers - Runs ONCE, then stops! */
.net-marker {
  fill: var(--color-vermilion);
  opacity: 0;
  animation: markerPulseOnce 0.8s ease-out forwards;
}

.net-marker-1 { animation-delay: 0.2s; }
.net-marker-2 { animation-delay: 0.5s; }
.net-marker-3 { animation-delay: 0.8s; }
.net-marker-4 { animation-delay: 1.1s; }
.net-marker-5 { animation-delay: 1.4s; }

.net-line-pulse {
  stroke-dasharray: 4 4;
  animation: lineTraceOnce 1.2s ease-out forwards;
  opacity: 0.6;
}

@keyframes markerPulseOnce {
  0% {
    opacity: 0;
    transform: scale(0.4);
    transform-origin: center;
  }
  60% {
    opacity: 1;
    transform: scale(1.3);
    transform-origin: center;
  }
  100% {
    opacity: 1;
    transform: scale(1);
    transform-origin: center;
  }
}

@keyframes lineTraceOnce {
  from {
    stroke-dashoffset: 20;
    opacity: 0.2;
  }
  to {
    stroke-dashoffset: 0;
    opacity: 0.8;
  }
}

/* Network Legend */
.dashboard-legend {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 16px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
}

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

.legend-symbol {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.legend-symbol.transit { background-color: var(--color-vermilion); }
.legend-symbol.routing { border: 2px solid var(--color-ink); background: none; }
.legend-symbol.peering { background-color: #383735; }
.legend-symbol.gateway { border: 1px dashed var(--color-vermilion); background: var(--color-vermilion-subtle); }

/* ==========================================================================
   Section 01: Three Core Advantages (Three Different-Sized Diagram Sections)
   ========================================================================== */
.advantages-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-rule);
}

.benefits-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-template-rows: auto auto;
  gap: 24px;
}

.benefit-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
  padding: 32px;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Card 1: Large (spans 2 rows on desktop) */
.benefit-card-large {
  grid-row: span 2;
  justify-content: space-between;
}

.benefit-card-medium {
  /* top right */
}

.benefit-card-compact {
  /* bottom right */
}

.benefit-meta-number {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-vermilion);
  font-weight: 600;
  margin-bottom: 12px;
  display: block;
}

.benefit-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.3;
  margin-bottom: 14px;
}

.benefit-desc {
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-ink-muted);
  margin-bottom: 24px;
}

.benefit-diagram {
  background-color: #FAF8F5;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 20px;
  margin-top: auto;
}

.diagram-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink-faint);
  text-align: center;
  margin-top: 10px;
}

/* ==========================================================================
   Section 02: Global Nodes (Clean Atlas List)
   ========================================================================== */
.nodes-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-rule);
}

.atlas-table-wrapper {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

.atlas-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 15px;
}

.atlas-table th {
  background-color: #F8F5F0;
  border-bottom: 1px solid var(--border-rule);
  padding: 14px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-ink);
  text-transform: uppercase;
}

.atlas-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

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

.atlas-region-cell {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: var(--color-ink);
}

.atlas-region-flag {
  font-size: 20px;
  line-height: 1;
}

.tag-badge {
  display: inline-block;
  padding: 3px 8px;
  font-size: 12px;
  font-family: var(--font-mono);
  border-radius: var(--radius-xs);
  background-color: #F0EBE3;
  color: var(--color-ink);
  border: 1px solid var(--border-subtle);
}

.tag-badge.vermilion {
  background-color: var(--color-vermilion-subtle);
  color: var(--color-vermilion);
  border-color: var(--color-vermilion-border);
}

/* ==========================================================================
   Section 03: Separate AI & Streaming Use Cases
   ========================================================================== */
.scenarios-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-rule);
}

.scenario-group {
  margin-bottom: 48px;
}

.scenario-group:last-child {
  margin-bottom: 0;
}

.scenario-group-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.scenario-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

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

.scenario-name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--color-ink);
}

.scenario-platform-type {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-vermilion);
  background: var(--color-vermilion-subtle);
  border: 1px solid var(--color-vermilion-border);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
}

.scenario-technical-note {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-ink-muted);
  margin-bottom: 16px;
  flex-grow: 1;
}

.scenario-params {
  border-top: 1px dashed var(--border-subtle);
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-faint);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ==========================================================================
   Section 04: Pricing Comparison Table
   ========================================================================== */
.pricing-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-rule);
}

.pricing-table-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 24px;
}

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

.pricing-table th, .pricing-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-table th {
  background-color: #F8F5F0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-rule);
}

.pricing-table tr:hover td {
  background-color: #FAF8F5;
}

.plan-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
}

.plan-price-val {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-vermilion);
}

.plan-price-period {
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
}

.editorial-placeholder {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  background-color: #F3EFE8;
  color: var(--color-ink-muted);
  border: 1px dashed var(--border-rule);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
}

.pricing-disclaimer {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-ink-muted);
  line-height: 1.6;
  border-left: 3px solid var(--color-vermilion);
  padding-left: 14px;
  background: var(--bg-card);
  padding: 12px 16px;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
}

/* Pricing Coupon Banner */
.pricing-coupon-banner {
  background-color: var(--color-vermilion-subtle);
  border: 1px solid var(--color-vermilion-border);
  border-radius: var(--radius-sm);
  padding: 18px 24px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.coupon-left {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.coupon-tag {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #FFFDFC;
  background-color: var(--color-vermilion);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
}

.coupon-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
}

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

.coupon-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.coupon-code-box {
  background-color: var(--bg-card);
  border: 1px dashed var(--color-vermilion);
  padding: 6px 14px;
  border-radius: var(--radius-xs);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.coupon-code-box .code-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-ink-muted);
}

.coupon-code-box .code-text {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-vermilion);
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Section 05: SEO Article Cards (Article-Index Layout directly below pricing)
   3 desktop / 2 tablet / 1 mobile columns
   ========================================================================== */
.articles-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-rule);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-index-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.article-index-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-vermilion);
}

.article-index-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.article-seq {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-vermilion);
}

.article-category {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-ink-muted);
  background: #F0ECE4;
  padding: 2px 6px;
  border-radius: var(--radius-xs);
}

.article-card-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.article-card-title a {
  display: block;
}

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

.article-card-summary {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-ink-muted);
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  border-top: 1px dashed var(--border-subtle);
  padding-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  font-family: var(--font-mono);
}

.article-date {
  color: var(--color-ink-faint);
}

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

/* ==========================================================================
   Section 06: Testimonials (Sourced or Visibly Sample)
   ========================================================================== */
.testimonials-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-rule);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.testimonial-sample-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-vermilion);
  background-color: var(--color-vermilion-subtle);
  border: 1px solid var(--color-vermilion-border);
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  margin-bottom: 16px;
}

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

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

.author-avatar-initials {
  width: 36px;
  height: 36px;
  background-color: #EFE9DF;
  border: 1px solid var(--border-rule);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ink);
}

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

.author-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
}

.author-title {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
}

/* ==========================================================================
   Section 07: FAQ Accordion
   ========================================================================== */
.faq-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-rule);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 900px;
}

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

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  background: none;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.faq-question:hover {
  background-color: #FAF8F5;
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.2s ease;
  color: var(--color-vermilion);
}

.faq-item.is-open .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 24px 22px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-ink-muted);
  border-top: 1px dashed var(--border-subtle);
  padding-top: 16px;
}

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

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: #EDE8E0;
  border-top: 1px solid var(--border-rule);
  padding: 60px 0 36px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-ink-muted);
  margin-top: 14px;
  max-width: 320px;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-ink);
  margin-bottom: 18px;
}

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

.footer-links-list a {
  font-size: 14px;
  color: var(--color-ink-muted);
}

.footer-links-list a:hover {
  color: var(--color-vermilion);
}

.footer-bottom {
  border-top: 1px solid var(--border-rule);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-muted);
}

/* ==========================================================================
   Article Pages Formatting (Breadcrumbs, Typography, Tables, FAQ)
   ========================================================================== */
.article-header {
  padding: 48px 0 36px;
  border-bottom: 1px solid var(--border-rule);
}

.breadcrumb-nav {
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-ink-muted);
}

.breadcrumb-nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  align-items: center;
}

.breadcrumb-separator {
  color: var(--color-ink-faint);
}

.article-title {
  font-family: var(--font-serif);
  font-size: 38px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-ink);
  margin-bottom: 18px;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-ink-muted);
  border-top: 1px dashed var(--border-rule);
  padding-top: 14px;
}

.article-content-body {
  padding: 48px 0 60px;
}

.article-prose {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-ink);
}

.article-prose p {
  margin-bottom: 24px;
}

.article-prose h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  color: var(--color-ink);
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-prose h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  margin-top: 32px;
  margin-bottom: 14px;
}

.article-prose ul, .article-prose ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-prose li {
  margin-bottom: 10px;
}

.article-prose blockquote {
  border-left: 3px solid var(--color-vermilion);
  background-color: var(--bg-card);
  padding: 16px 20px;
  margin: 28px 0;
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
  font-style: italic;
  color: var(--color-ink);
}

.article-prose code {
  font-family: var(--font-mono);
  font-size: 14px;
  background-color: #EFE9DF;
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
}

.article-prose pre {
  background-color: #2F2E2C;
  color: #F8F5F0;
  padding: 20px;
  border-radius: var(--radius-xs);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  margin: 24px 0;
}

.article-prose pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  background: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.article-table th {
  background: #F8F5F0;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-rule);
  font-family: var(--font-mono);
  font-size: 13px;
}

.article-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-subtle);
}

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

.article-cta-box {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-left: 4px solid var(--color-vermilion);
  padding: 28px;
  border-radius: var(--radius-sm);
  margin: 40px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.article-related-section {
  border-top: 1px solid var(--border-rule);
  padding-top: 40px;
  margin-top: 48px;
}

.related-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.related-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-rule);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  border-color: var(--color-vermilion);
}

.related-card-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.related-card-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-ink-faint);
  margin-top: auto;
}

/* ==========================================================================
   Responsive Breakpoints: 1440, 1024, 768, 430, 390, 375 px
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-content {
    padding-right: 0;
  }
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  .benefit-card-large {
    grid-row: span 1;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .scenario-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .related-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: var(--h1-mobile);
  }
  .section-title {
    font-size: 26px;
  }
  .nav-links, .header-actions .btn {
    display: none;
  }
  .mobile-nav-toggle {
    display: flex;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  .scenario-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .related-links-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .article-cta-box {
    flex-direction: column;
    align-items: stretch;
  }
  .article-cta-box .btn {
    width: 100%;
  }
}

@media (max-width: 430px) {
  .container, .container-reading {
    padding-left: 16px;
    padding-right: 16px;
  }
  .hero-title {
    font-size: 32px;
  }
  .benefit-card, .network-dashboard {
    padding: 20px 16px;
  }
  .atlas-table th, .atlas-table td {
    padding: 12px 14px;
    font-size: 13px;
  }
  .pricing-table th, .pricing-table td {
    padding: 14px 14px;
    font-size: 13px;
  }
  .dashboard-legend {
    grid-template-columns: 1fr;
  }
}

/* Reduced Motion Support */
@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;
  }
  .net-marker {
    opacity: 1 !important;
    animation: none !important;
  }
  .net-line-pulse {
    animation: none !important;
  }
}