/* ==========================================================================
   优信云 官方网站 - 2026 高速跨境专线与智能路由平台
   Design Tokens:
   - White: #FFFFFF
   - Deep Blue-Gray: #2B4658
   - Soft Clay: #C7957F
   - Pale Sky: #EAF3F5
   - Heading Serif: Chinese Songti-style serif
   - Body Sans: Clean system sans-serif
   ========================================================================== */

:root {
  /* Core Color Palette */
  --color-white: #FFFFFF;
  --color-dark: #2B4658;
  --color-dark-deep: #1B2F3D;
  --color-dark-surface: #243B4B;
  --color-clay: #C7957F;
  --color-clay-hover: #B5846E;
  --color-clay-soft: rgba(199, 149, 127, 0.12);
  --color-pale-sky: #EAF3F5;
  --color-pale-sky-dark: #D4E5E9;
  
  /* Layout & Text Colors */
  --color-bg: #FFFFFF;
  --color-surface: #F8FBFC;
  --color-surface-alt: #F1F6F8;
  --color-border: #D8E5E8;
  --color-border-subtle: #E8F0F2;
  --color-text: #2B4658;
  --color-text-muted: #5B7586;
  --color-text-light: #8CA3B0;
  
  /* Typography */
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", SimSun, "STSong", "Songti TC", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Sizing & Transitions */
  --container-max: 1200px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 6px rgba(43, 70, 88, 0.05);
  --shadow-md: 0 8px 24px rgba(43, 70, 88, 0.08);
  --shadow-lg: 0 16px 40px rgba(43, 70, 88, 0.12);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Headings: Songti-Style Serif */
h1, h2, h3, h4, h5, h6,
.display-title, .section-title, .hero-title, .card-title, .panel-title {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

h1, .hero-title {
  font-size: 55px;
  line-height: 1.2;
}

h2, .section-title {
  font-size: 34px;
  margin-bottom: 12px;
}

h3 {
  font-size: 24px;
  margin-bottom: 8px;
}

h4 {
  font-size: 20px;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-dark);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

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

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

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

.section {
  padding: 96px 0;
  position: relative;
}

.section-alt {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.section-pale {
  background-color: var(--color-pale-sky);
  border-top: 1px solid var(--color-pale-sky-dark);
  border-bottom: 1px solid var(--color-pale-sky-dark);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-clay);
  background-color: var(--color-clay-soft);
  border: 1px solid rgba(199, 149, 127, 0.28);
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 19px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* Buttons & CTAs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-clay {
  background-color: var(--color-clay);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(199, 149, 127, 0.32);
}

.btn-clay:hover {
  background-color: var(--color-clay-hover);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(199, 149, 127, 0.42);
}

.btn-dark {
  background-color: var(--color-dark);
  color: var(--color-white);
}

.btn-dark:hover {
  background-color: var(--color-dark-deep);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-dark);
  border-color: var(--color-border);
}

.btn-outline:hover {
  background-color: var(--color-pale-sky);
  border-color: var(--color-dark);
  color: var(--color-dark);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
  border-radius: var(--radius-sm);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: all var(--transition-fast);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
}

.brand-logo svg {
  width: 34px;
  height: 34px;
}

.brand-tagline {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--color-text-muted);
  font-weight: 400;
  border-left: 1px solid var(--color-border);
  padding-left: 10px;
  margin-left: 2px;
}

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

.nav-menu a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  padding: 6px 4px;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-clay);
  transition: width var(--transition-fast);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

.nav-cta-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-dark);
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-dark);
  margin: 5px 0;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* Mobile Drawer */
.mobile-nav {
  display: none;
  position: fixed;
  top: 76px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  padding: 32px 24px;
  overflow-y: auto;
  border-top: 1px solid var(--color-border);
  z-index: 99;
}

.mobile-nav.open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 32px;
}

.mobile-nav-list a {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-dark);
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

/* ==========================================================================
   Hero Section: Left Copy + Right 3D Folding Network Map
   ========================================================================== */
.hero-section {
  padding: 72px 0 96px 0;
  background: linear-gradient(180deg, #FFFFFF 0%, #F5F9FA 100%);
  position: relative;
  overflow: hidden;
}

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

.hero-content {
  max-width: 540px;
}

.hero-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-dark);
  background-color: var(--color-pale-sky);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-pale-sky-dark);
  margin-bottom: 20px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-clay);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(199, 149, 127, 0.7);
  animation: dotPulse 2s infinite;
}

@keyframes dotPulse {
  0% { box-shadow: 0 0 0 0 rgba(199, 149, 127, 0.7); }
  70% { box-shadow: 0 0 0 8px rgba(199, 149, 127, 0); }
  100% { box-shadow: 0 0 0 0 rgba(199, 149, 127, 0); }
}

.hero-title {
  margin-bottom: 20px;
}

.hero-title span.brand-accent {
  color: var(--color-clay);
  border-bottom: 2px solid var(--color-clay);
}

.hero-intro {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--color-text-muted);
}

.highlight-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-clay);
}

/* 3D Folding Map Dashboard (Right Side) */
.map-dashboard-container {
  position: relative;
  width: 100%;
}

.map-perspective-stage {
  perspective: 1200px;
  perspective-origin: 50% 40%;
  transform-style: preserve-3d;
  width: 100%;
  max-width: 580px;
  margin: 0 auto;
}

/* 3-Panel Unfolded Card Container */
.folding-map-root {
  display: flex;
  transform-style: preserve-3d;
  animation: mapUnfoldEntry 1.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  position: relative;
  box-shadow: 0 24px 50px rgba(43, 70, 88, 0.12);
  border-radius: var(--radius-lg);
  background-color: var(--color-dark);
  padding: 12px;
}

@keyframes mapUnfoldEntry {
  0% {
    opacity: 0;
    transform: rotateX(24deg) rotateY(-22deg) scale(0.9);
  }
  60% {
    transform: rotateX(6deg) rotateY(-5deg) scale(1.02);
  }
  100% {
    opacity: 1;
    transform: rotateX(8deg) rotateY(-7deg) scale(1);
  }
}

/* Three Panels */
.map-panel {
  flex: 1;
  background: linear-gradient(180deg, #243B4B 0%, #1B2F3D 100%);
  border: 1px solid rgba(234, 243, 245, 0.15);
  padding: 18px 14px;
  border-radius: var(--radius-md);
  position: relative;
  transform-style: preserve-3d;
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.map-panel-left {
  transform-origin: right center;
  transform: rotateY(14deg);
  border-right: 1px dashed rgba(199, 149, 127, 0.35);
}

.map-panel-center {
  flex: 1.15;
  transform-origin: center center;
  transform: translateZ(18px);
  background: linear-gradient(180deg, #2B4658 0%, #1E3342 100%);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(199, 149, 127, 0.4);
}

.map-panel-right {
  transform-origin: left center;
  transform: rotateY(-14deg);
  border-left: 1px dashed rgba(199, 149, 127, 0.35);
}

.panel-header-badge {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(234, 243, 245, 0.1);
}

.panel-label {
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-pale-sky);
  text-transform: uppercase;
}

.panel-status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 10px;
  color: #79D2B5;
  font-family: var(--font-mono);
}

.panel-status-dot {
  width: 6px;
  height: 6px;
  background-color: #79D2B5;
  border-radius: 50%;
}

/* Panel SVG Graphic Content */
.panel-svg-viewport {
  width: 100%;
  height: 180px;
  position: relative;
}

/* Subtle Route Pulse Keyframes */
@keyframes routePulseGlow {
  0% {
    stroke-dashoffset: 200;
    opacity: 0.4;
  }
  50% {
    opacity: 1;
  }
  100% {
    stroke-dashoffset: 0;
    opacity: 0.4;
  }
}

.route-pulse-line {
  stroke-dasharray: 8 6;
  animation: routePulseGlow 4s linear infinite;
}

.route-beacon-outer {
  animation: beaconPulse 2.5s ease-in-out infinite;
  transform-origin: center;
}

@keyframes beaconPulse {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.35); opacity: 0.15; }
}

.panel-footer-meta {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px solid rgba(234, 243, 245, 0.08);
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--color-text-light);
  font-family: var(--font-mono);
}

.panel-footer-meta span.active-route {
  color: var(--color-clay);
  font-weight: 600;
}

/* ==========================================================================
   Section 1: Benefits - Unfolded Section Panels of Different Widths
   ========================================================================== */
.benefits-panels-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr 1.15fr;
  gap: 24px;
  align-items: stretch;
}

.benefit-panel-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.benefit-panel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-clay);
}

/* Panel Width Theming */
.panel-wide {
  background: linear-gradient(180deg, #FFFFFF 0%, #FAFCFD 100%);
  border-top: 4px solid var(--color-dark);
}

.panel-narrow {
  background: linear-gradient(180deg, #FFFFFF 0%, #F5F9FA 100%);
  border-top: 4px solid var(--color-clay);
}

.panel-medium {
  background: linear-gradient(180deg, #FFFFFF 0%, #F8FBFB 100%);
  border-top: 4px solid #577284;
}

.benefit-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: var(--color-pale-sky);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-dark);
  margin-bottom: 24px;
}

.panel-narrow .benefit-icon-box {
  background-color: var(--color-clay-soft);
  color: var(--color-clay);
}

.benefit-icon-box svg {
  width: 26px;
  height: 26px;
}

.benefit-panel-card h3 {
  font-size: 22px;
  margin-bottom: 14px;
}

.benefit-panel-card p {
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 20px;
}

.benefit-spec-list {
  list-style: none;
  margin-top: auto;
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 16px;
}

.benefit-spec-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.benefit-spec-list li::before {
  content: '✓';
  color: var(--color-clay);
  font-weight: 700;
}

/* ==========================================================================
   Section 2: Nodes - Flat, Readable Region List
   ========================================================================== */
.nodes-table-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.nodes-table-header {
  padding: 24px 30px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.nodes-table-header h3 {
  font-size: 20px;
  margin: 0;
}

.nodes-note-badge {
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-white);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}

.region-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background-color: var(--color-border-subtle);
}

.region-row-item {
  background-color: var(--color-white);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background-color var(--transition-fast);
}

.region-row-item:hover {
  background-color: var(--color-surface);
}

.region-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.region-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--color-dark);
}

.region-flag {
  font-size: 18px;
}

.region-status {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: #2F855A;
  font-family: var(--font-mono);
  font-weight: 600;
}

.status-dot-sm {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #38A169;
}

.region-details {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.region-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.region-tag-pill {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background-color: var(--color-pale-sky);
  color: var(--color-dark);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Section 3: AI & Streaming Two Separate Use-Case Chapters
   ========================================================================== */
.chapter-container {
  margin-bottom: 72px;
}

.chapter-container:last-child {
  margin-bottom: 0;
}

.chapter-header {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 32px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--color-border);
}

.chapter-number {
  font-family: var(--font-serif);
  font-size: 38px;
  font-weight: 700;
  color: var(--color-clay);
  line-height: 1;
}

.chapter-title-group h3 {
  font-size: 26px;
  margin-bottom: 6px;
}

.chapter-title-group p {
  color: var(--color-text-muted);
  font-size: 16px;
  margin: 0;
}

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

.scenario-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.scenario-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-clay);
  box-shadow: var(--shadow-md);
}

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

.tool-name {
  font-weight: 700;
  font-size: 17px;
  color: var(--color-dark);
}

.tool-category {
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--color-clay);
  background-color: var(--color-clay-soft);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.scenario-card h4 {
  font-size: 17px;
  margin-bottom: 10px;
  font-family: var(--font-sans);
  font-weight: 600;
}

.scenario-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.scenario-footer {
  padding-top: 12px;
  border-top: 1px dashed var(--color-border-subtle);
  font-size: 13px;
  color: var(--color-dark);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

.scenario-footer span.bullet {
  color: var(--color-clay);
}

/* ==========================================================================
   Section 4: Pricing Section (4-5 Tiers, Exactly ONE "推荐套餐")
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* Exactly One 推荐套餐 */
.pricing-card.recommended {
  border: 2px solid var(--color-clay);
  background: linear-gradient(180deg, #FFFFFF 0%, #FDFCFA 100%);
  box-shadow: 0 12px 36px rgba(199, 149, 127, 0.18);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.recommended:hover {
  transform: scale(1.03) translateY(-4px);
}

.tier-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-clay);
  color: var(--color-white);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(199, 149, 127, 0.4);
  white-space: nowrap;
}

.tier-name {
  font-size: 22px;
  margin-bottom: 8px;
}

.tier-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  min-height: 40px;
  margin-bottom: 20px;
}

.tier-price-box {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border-subtle);
}

.price-currency {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
}

.price-amount {
  font-size: 44px;
  font-weight: 700;
  font-family: var(--font-serif);
  color: var(--color-dark);
  line-height: 1;
}

.price-period {
  font-size: 14px;
  color: var(--color-text-muted);
}

.tier-traffic-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-clay);
  background-color: var(--color-clay-soft);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-top: 10px;
}

.tier-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.tier-features li {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}

.tier-features li svg {
  width: 16px;
  height: 16px;
  color: var(--color-clay);
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-note-banner {
  margin-top: 40px;
  text-align: center;
  font-size: 14px;
  color: var(--color-text-muted);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 14px 20px;
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Section 5: Nine (9) Articles Cards Section (3/2/1 Column Grid)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

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

.article-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  font-size: 12px;
  color: var(--color-text-light);
  font-family: var(--font-mono);
}

.article-category {
  color: var(--color-clay);
  font-weight: 600;
  background-color: var(--color-clay-soft);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.article-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card h3 a {
  color: var(--color-dark);
}

.article-card h3 a:hover {
  color: var(--color-clay);
}

.article-card p {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  border-top: 1px solid var(--color-border-subtle);
  font-size: 14px;
}

.read-more-link {
  font-weight: 600;
  color: var(--color-clay);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-more-link:hover {
  color: var(--color-dark);
}

/* ==========================================================================
   Section 6: Testimonials (Marked-Sample Feedback)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.testimonial-quote {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 20px;
  flex-grow: 1;
  font-style: normal;
}

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

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

.author-info h4 {
  font-size: 15px;
  margin: 0;
  font-family: var(--font-sans);
}

.author-role {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Section 7: FAQ Accordion Section
   ========================================================================== */
.faq-accordion-wrap {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: var(--color-clay);
}

.faq-trigger {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--color-dark);
  cursor: pointer;
  gap: 16px;
}

.faq-icon-cross {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  position: relative;
  transition: transform var(--transition-fast);
}

.faq-icon-cross::before,
.faq-icon-cross::after {
  content: '';
  position: absolute;
  background-color: var(--color-dark);
  transition: transform var(--transition-fast);
}

.faq-icon-cross::before {
  top: 9px;
  left: 2px;
  width: 16px;
  height: 2px;
}

.faq-icon-cross::after {
  top: 2px;
  left: 9px;
  width: 2px;
  height: 16px;
}

.faq-item.active .faq-icon-cross::after {
  transform: rotate(90deg);
}

.faq-body {
  padding: 0 24px 22px 24px;
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.75;
  display: none;
}

.faq-item.active .faq-body {
  display: block;
}

/* ==========================================================================
   Footer Section & PBN Links
   ========================================================================== */
.site-footer {
  background-color: var(--color-dark-deep);
  color: var(--color-pale-sky);
  padding: 72px 0 36px 0;
  border-top: 1px solid rgba(234, 243, 245, 0.1);
  font-size: 15px;
}

.footer-main-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 56px;
}

.footer-brand h4 {
  font-size: 22px;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-brand p {
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.7;
}

.footer-col h5 {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}

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

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

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

/* Mandatory External PBN / Recommended Reference Links */
.footer-pbn-bar {
  padding: 24px 0;
  border-top: 1px solid rgba(234, 243, 245, 0.1);
  border-bottom: 1px solid rgba(234, 243, 245, 0.1);
  text-align: center;
  margin-bottom: 28px;
}

.footer-pbn-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-pbn-links {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-pbn-link {
  color: var(--color-clay) !important;
  font-size: 14px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background-color: rgba(199, 149, 127, 0.12);
  transition: all var(--transition-fast);
}

.footer-pbn-link:hover {
  color: var(--color-white) !important;
  background-color: var(--color-clay);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--color-text-light);
}

.footer-bottom-links {
  display: flex;
  gap: 18px;
}

.footer-bottom-links a {
  color: var(--color-text-light);
}

.footer-bottom-links a:hover {
  color: var(--color-clay);
}

/* ==========================================================================
   Article Pages & Generic Content Layouts
   ========================================================================== */
.article-header {
  padding: 60px 0 40px 0;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border-subtle);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

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

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

.article-content-body {
  max-width: 840px;
  margin: 0 auto;
  padding: 60px 0;
  font-size: 18px;
  line-height: 1.85;
}

.article-content-body h2 {
  font-size: 28px;
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.article-content-body h3 {
  font-size: 22px;
  margin-top: 32px;
  margin-bottom: 14px;
}

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

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

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

.article-content-body blockquote {
  border-left: 4px solid var(--color-clay);
  background-color: var(--color-pale-sky);
  padding: 18px 24px;
  margin: 28px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: normal;
  color: var(--color-dark);
}

.article-content-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 32px 0;
  font-size: 16px;
}

.article-content-body th, .article-content-body td {
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.article-content-body th {
  background-color: var(--color-surface);
  font-weight: 700;
  color: var(--color-dark);
}

.article-cta-box {
  background: linear-gradient(135deg, var(--color-pale-sky) 0%, #FFFFFF 100%);
  border: 1px solid var(--color-pale-sky-dark);
  border-left: 5px solid var(--color-clay);
  padding: 32px;
  border-radius: var(--radius-md);
  margin: 48px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.related-articles-section {
  padding: 48px 0;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   Responsive Adaptations & Mobile First Polishing
   Breakpoints: 1024px, 768px, 430px, 390px, 375px
   ========================================================================== */

@media (max-width: 1024px) {
  h1, .hero-title {
    font-size: 44px;
  }
  
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  
  .benefits-panels-grid {
    grid-template-columns: 1fr 1fr;
  }

  .panel-wide {
    grid-column: span 2;
  }

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

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

  .pricing-card.recommended {
    transform: none;
  }
  
  .pricing-card.recommended:hover {
    transform: translateY(-4px);
  }

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

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

@media (max-width: 768px) {
  body {
    font-size: 16px;
  }

  h1, .hero-title {
    font-size: 35px; /* Prompt requirement: H1 35px mobile */
    line-height: 1.25;
  }

  h2, .section-title {
    font-size: 26px;
  }

  .section {
    padding: 60px 0;
  }

  .nav-menu, .nav-cta-wrap .btn {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-content {
    max-width: 100%;
  }

  /* 3D Map Static / Flattened Layout on Mobile */
  .map-perspective-stage {
    perspective: none;
  }

  .folding-map-root {
    animation: none;
    transform: none !important;
    flex-direction: column;
    gap: 12px;
    padding: 10px;
  }

  .map-panel {
    transform: none !important;
    width: 100% !important;
  }

  .benefits-panels-grid {
    grid-template-columns: 1fr;
  }

  .panel-wide {
    grid-column: span 1;
  }

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

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

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

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

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

  .footer-pbn-links {
    flex-direction: column;
    gap: 12px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 430px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  h1, .hero-title {
    font-size: 32px;
  }

  .btn {
    width: 100%;
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-highlights {
    flex-direction: column;
    gap: 12px;
  }

  .article-cta-box {
    flex-direction: column;
    text-align: center;
  }
}

/* Reduced Motion Mode */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .folding-map-root {
    animation: none !important;
    transform: none !important;
  }

  .map-panel {
    transform: none !important;
  }

  .route-pulse-line, .route-beacon-outer, .pulse-dot {
    animation: none !important;
  }
}