/* ==========================================================================
   Panda Cloud (熊猫cloud) - Modern Editorial Landing & Documentation System
   Design: Dusty-rose and Navy Editorial Aesthetic
   Palette: Background #FBF8F7, Navy #24324A, Dusty Rose #C58F98, Pale Pink-Gray #F2E6E7
   ========================================================================== */

:root {
  /* Primary Color System */
  --bg-main: #FBF8F7;
  --bg-card: #FFFFFF;
  --bg-alt: #F7EFEF;
  --bg-rose-tint: #F2E6E7;
  --bg-navy-dark: #1D283C;

  --color-navy: #24324A;
  --color-navy-light: #364764;
  --color-navy-dark: #162030;
  --color-navy-muted: #566479;

  --color-rose: #C58F98;
  --color-rose-deep: #A36B75;
  --color-rose-dark: #814C56;
  --color-rose-light: #F2E6E7;
  --color-rose-subtle: #FAF2F3;

  --border-light: #EBE1E2;
  --border-medium: #DDD0D2;
  --border-rose: #C58F98;
  --border-navy: #24324A;

  /* Typography */
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", "STSong", "Songti", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SF Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  /* Typography Scales */
  --fs-h1: 50px;
  --fs-h2: 32px;
  --fs-h3: 24px;
  --fs-h4: 20px;
  --fs-body: 18px;
  --fs-small: 15px;
  --fs-micro: 13px;

  --lh-tight: 1.25;
  --lh-snug: 1.4;
  --lh-body: 1.75;

  /* Spacing */
  --container-width: 1200px;
  --gap-xs: 8px;
  --gap-sm: 16px;
  --gap-md: 24px;
  --gap-lg: 40px;
  --gap-xl: 64px;
  --gap-2xl: 96px;

  /* UI Shadows & Transitions */
  --shadow-sm: 0 2px 8px rgba(36, 50, 74, 0.04);
  --shadow-md: 0 8px 24px rgba(36, 50, 74, 0.07);
  --shadow-hover: 0 14px 32px rgba(36, 50, 74, 0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   CSS Reset & Base Setup
   ========================================================================== */
*, *::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: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--color-navy);
  background-color: var(--bg-main);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

a:hover, a:focus-visible {
  color: var(--color-rose-deep);
}

p {
  margin-bottom: 1.25rem;
  color: var(--color-navy-muted);
}

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

strong, b {
  font-weight: 600;
  color: var(--color-navy);
}

/* Headings with refined Chinese Serif fallback */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-navy);
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--fs-h1);
  margin-bottom: 1.5rem;
}

h2 {
  font-size: var(--fs-h2);
  margin-bottom: 1.25rem;
}

h3 {
  font-size: var(--fs-h3);
  margin-bottom: 1rem;
}

h4 {
  font-size: var(--fs-h4);
  margin-bottom: 0.75rem;
}

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

/* ==========================================================================
   Header & Mobile Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(251, 248, 247, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  height: 72px;
}

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

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-img {
  height: 38px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-item a {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-navy);
  padding: 8px 0;
  position: relative;
}

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  background-color: var(--color-navy);
  color: #FFFFFF !important;
  font-size: var(--fs-small);
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-navy);
  transition: all var(--transition-fast);
}

.btn-header-cta:hover {
  background-color: var(--color-rose-deep);
  border-color: var(--color-rose-deep);
  color: #FFFFFF !important;
  transform: translateY(-1px);
}

/* Hamburger button */
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-navy);
  border-radius: var(--radius-sm);
}

.hamburger-icon {
  width: 26px;
  height: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hamburger-line {
  display: block;
  height: 2.5px;
  width: 100%;
  background-color: var(--color-navy);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(8.5px) rotate(45deg);
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger-btn[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-8.5px) rotate(-45deg);
}

/* ==========================================================================
   Buttons & Badges
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--color-navy);
  color: #FFFFFF !important;
  border-color: var(--color-navy);
}

.btn-primary:hover {
  background-color: var(--color-rose-deep);
  border-color: var(--color-rose-deep);
  color: #FFFFFF !important;
  box-shadow: 0 4px 14px rgba(129, 76, 86, 0.25);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--bg-rose-tint);
  color: var(--color-navy) !important;
  border-color: var(--border-medium);
}

.btn-secondary:hover {
  background-color: #FFFFFF;
  border-color: var(--color-rose);
  color: var(--color-navy) !important;
  transform: translateY(-2px);
}

.editorial-tag {
  display: inline-block;
  padding: 4px 12px;
  background-color: var(--bg-rose-tint);
  border: 1px solid var(--border-medium);
  color: var(--color-rose-deep);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

/* ==========================================================================
   Hero Section: Narrow Left Copy & Right Transit Map Dashboard
   ========================================================================== */
.hero-section {
  padding-top: var(--gap-xl);
  padding-bottom: var(--gap-2xl);
  border-bottom: 1px solid var(--border-light);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 42% 58%;
  gap: var(--gap-lg);
  align-items: center;
}

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

.hero-copy h1 {
  font-size: var(--fs-h1);
  color: var(--color-navy);
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-copy h1 span.brand-accent {
  color: var(--color-rose-deep);
  font-style: italic;
  font-weight: 800;
}

.hero-desc {
  font-size: var(--fs-body);
  color: var(--color-navy-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.hero-meta-strip {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: var(--fs-micro);
  color: var(--color-navy-muted);
  padding-top: 16px;
  border-top: 1px dashed var(--border-medium);
}

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

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

/* Transit Map Dashboard on Right */
.transit-dashboard {
  background-color: #FFFFFF;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-md);
  position: relative;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.dashboard-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-navy);
  display: flex;
  align-items: center;
  gap: 8px;
}

.dashboard-legend {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: var(--fs-micro);
  color: var(--color-navy-muted);
}

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

.legend-line-solid {
  width: 20px;
  height: 2px;
  background-color: var(--color-rose);
}

.legend-line-dashed {
  width: 20px;
  height: 2px;
  border-top: 2px dashed var(--color-navy);
}

/* SVG Transit Canvas */
.transit-map-svg-wrap {
  width: 100%;
  height: auto;
  position: relative;
}

.transit-map-svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Animate traveling dot along transit route slowly */
.traveling-dot {
  fill: var(--color-rose-deep);
  stroke: #FFFFFF;
  stroke-width: 2px;
  transform-origin: center;
  animation: transitTravel 16s ease-in-out infinite alternate;
}

@keyframes transitTravel {
  0% {
    transform: translate(0, 0);
  }
  25% {
    transform: translate(220px, 30px);
  }
  50% {
    transform: translate(320px, 140px);
  }
  75% {
    transform: translate(160px, 200px);
  }
  100% {
    transform: translate(440px, 230px);
  }
}

/* Honor prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .traveling-dot {
    animation: none !important;
  }
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.dashboard-footer-notes {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-micro);
  color: var(--color-navy-muted);
}

/* ==========================================================================
   Diagonal Visual Rhythm: Offset Section Headings & Broad Color Fields
   ========================================================================== */
.section {
  padding-top: var(--gap-2xl);
  padding-bottom: var(--gap-2xl);
  position: relative;
}

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

.section-bg-navy {
  background-color: var(--color-navy);
  color: #FFFFFF;
}

.section-bg-navy p {
  color: #BAC7D5;
}

.section-bg-navy h2, 
.section-bg-navy h3, 
.section-bg-navy h4 {
  color: #FFFFFF;
}

/* Offset Section Headings for Diagonal Rhythm */
.section-header-offset {
  max-width: 780px;
  margin-bottom: var(--gap-xl);
  position: relative;
}

.section-header-offset.align-left {
  margin-left: 0;
  margin-right: auto;
}

.section-header-offset.align-right {
  margin-left: auto;
  margin-right: 0;
  text-align: right;
}

.section-header-offset.align-center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-subhead {
  font-size: 19px;
  color: var(--color-navy-muted);
  line-height: 1.7;
}

.section-bg-navy .section-subhead {
  color: #C3D0DF;
}

/* ==========================================================================
   Three Advantages Section (Varied Feature Sizes)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: var(--gap-md);
}

.adv-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  display: flex;
  flex-direction: column;
}

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

.adv-card.featured {
  background-color: #FAF4F5;
  border-color: var(--border-rose);
  border-width: 2px;
}

.adv-badge {
  display: inline-block;
  font-size: var(--fs-micro);
  font-weight: 700;
  color: var(--color-rose-deep);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.adv-card h3 {
  font-size: var(--fs-h3);
  margin-bottom: 14px;
}

.adv-card p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-navy-muted);
}

.adv-specs {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px dashed var(--border-medium);
  list-style: none;
  font-size: var(--fs-small);
  color: var(--color-navy);
}

.adv-specs li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.adv-specs li:last-child {
  margin-bottom: 0;
}

.adv-specs li::before {
  content: "—";
  color: var(--color-rose-deep);
  font-weight: bold;
}

/* ==========================================================================
   Global Network Nodes (Factual Architectural Analysis)
   HK, JP, SG, US without invented speed/latency/totals
   ========================================================================== */
.regions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.region-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.region-card:hover {
  border-color: var(--color-navy);
  box-shadow: var(--shadow-md);
}

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

.region-code {
  font-size: 26px;
  font-weight: 800;
  font-family: var(--font-serif);
  color: var(--color-navy);
}

.region-tag {
  font-size: var(--fs-micro);
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-rose-tint);
  color: var(--color-rose-deep);
}

.region-name {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 10px;
}

.region-desc {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-navy-muted);
  margin-bottom: 18px;
}

.region-meta {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  font-size: var(--fs-micro);
  color: var(--color-navy);
}

.region-meta-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
}

.region-meta-item:last-child {
  margin-bottom: 0;
}

.region-meta-label {
  color: var(--color-navy-muted);
}

/* ==========================================================================
   AI & Streaming Scenarios (Contextual Analysis, NOT a Logo Wall)
   ========================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap-lg);
}

.scenario-panel {
  background-color: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 32px;
  box-shadow: var(--shadow-sm);
}

.scenario-panel h3 {
  font-size: var(--fs-h3);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.scenario-lead {
  font-size: 16px;
  color: var(--color-navy-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-light);
}

.service-scenarios-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.scenario-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.scenario-item-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.scenario-app-name {
  font-weight: 700;
  color: var(--color-navy);
  font-size: 17px;
}

.scenario-app-tag {
  font-size: var(--fs-micro);
  color: var(--color-rose-deep);
  background-color: var(--bg-rose-tint);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
}

.scenario-item-desc {
  font-size: 15px;
  color: var(--color-navy-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Pricing Section (Elegant Column Comparison)
   Editorial placeholders for unverified values
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-md);
  align-items: stretch;
}

.pricing-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}

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

.pricing-card.popular {
  border-color: var(--color-rose-deep);
  border-width: 2px;
  box-shadow: 0 8px 30px rgba(197, 143, 152, 0.18);
  background-color: #FAF5F6;
}

.pricing-badge-popular {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-rose-deep);
  color: #FFFFFF;
  font-size: var(--fs-micro);
  font-weight: 700;
  padding: 3px 14px;
  border-radius: 20px;
  letter-spacing: 0.05em;
}

.pricing-plan-name {
  font-size: 22px;
  font-weight: 700;
  font-family: var(--font-serif);
  color: var(--color-navy);
  margin-bottom: 8px;
}

.pricing-plan-desc {
  font-size: 14px;
  color: var(--color-navy-muted);
  margin-bottom: 24px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.price-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-navy);
}

.price-amount {
  font-size: 42px;
  font-weight: 800;
  font-family: var(--font-serif);
  color: var(--color-navy);
  line-height: 1;
}

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

.editorial-note-badge {
  font-size: 12px;
  color: var(--color-rose-dark);
  background-color: var(--bg-rose-tint);
  border: 1px dashed var(--border-rose);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  line-height: 1.4;
}

.pricing-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--color-navy);
}

.feature-check {
  color: var(--color-rose-deep);
  font-weight: bold;
  line-height: 1.2;
}

.pricing-action {
  margin-top: auto;
}

.pricing-action .btn {
  width: 100%;
}

/* ==========================================================================
   Article Cards (Immediately after Pricing, Reading Notes Aesthetic)
   3 cols desktop, 2 cols tablet, 1 col mobile
   ========================================================================== */
.articles-section {
  padding-top: var(--gap-2xl);
  padding-bottom: var(--gap-2xl);
  border-top: 1px solid var(--border-light);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-note-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
  position: relative;
  text-decoration: none;
}

.article-note-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 3px;
  background-color: var(--border-medium);
  transition: background-color var(--transition-fast);
}

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

.article-note-card:hover::before {
  background-color: var(--color-rose);
}

.card-meta-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.card-topic-tag {
  font-size: var(--fs-micro);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-rose-deep);
  letter-spacing: 0.05em;
}

.card-reading-time {
  font-size: var(--fs-micro);
  color: var(--color-navy-muted);
}

.article-card-title {
  font-size: 21px;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.35;
  margin-bottom: 14px;
}

.article-card-summary {
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-navy-muted);
  margin-bottom: 20px;
  flex-grow: 1;
}

.card-read-action {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-navy);
  padding-top: 14px;
  border-top: 1px dashed var(--border-light);
  transition: color var(--transition-fast);
}

.article-note-card:hover .card-read-action {
  color: var(--color-rose-deep);
}

.card-read-action svg {
  transition: transform var(--transition-fast);
}

.article-note-card:hover .card-read-action svg {
  transform: translateX(4px);
}

/* ==========================================================================
   Sample Testimonials Section (Clearly Labeled Feedback / Sample Set)
   ========================================================================== */
.testimonials-section {
  background-color: var(--bg-rose-tint);
  border-top: 1px solid var(--border-medium);
  border-bottom: 1px solid var(--border-medium);
  padding-top: var(--gap-2xl);
  padding-bottom: var(--gap-2xl);
}

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

.testimonial-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
}

.testimonial-quote {
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-navy);
  font-style: italic;
  margin-bottom: 20px;
  flex-grow: 1;
}

.testimonial-author-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.author-avatar-initial {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-navy);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
}

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

.author-name {
  font-weight: 700;
  font-size: 15px;
  color: var(--color-navy);
}

.author-role {
  font-size: var(--fs-micro);
  color: var(--color-navy-muted);
}

/* ==========================================================================
   FAQ Accordion Section
   ========================================================================== */
.faq-section {
  padding-top: var(--gap-2xl);
  padding-bottom: var(--gap-2xl);
}

.faq-list {
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

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

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

.faq-question-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 22px 26px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-navy);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-sans);
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
  color: var(--color-rose-deep);
}

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

.faq-answer-panel {
  display: none;
  padding: 0 26px 24px 26px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-navy-muted);
  border-top: 1px dashed var(--border-light);
  padding-top: 16px;
}

.faq-item.active .faq-answer-panel {
  display: block;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-navy-dark);
  color: #CFD8E3;
  padding-top: var(--gap-2xl);
  padding-bottom: 40px;
  border-top: 1px solid #2B3A52;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--gap-lg);
  margin-bottom: var(--gap-xl);
}

.footer-col h4 {
  font-size: 17px;
  color: #FFFFFF;
  margin-bottom: 20px;
  font-family: var(--font-serif);
}

.footer-brand-p {
  font-size: 15px;
  line-height: 1.7;
  color: #A4B3C5;
  margin-bottom: 20px;
  max-width: 320px;
}

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

.footer-nav-list a {
  color: #A4B3C5;
  font-size: 15px;
}

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

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

.footer-external-links a {
  color: #C58F98;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-external-links a:hover {
  color: #E2B4BC;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid #2B3A52;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-micro);
  color: #7D8E9F;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   Article Pages Template Layout (In-depth Documentation)
   ========================================================================== */
.article-page-header {
  padding-top: var(--gap-lg);
  padding-bottom: var(--gap-lg);
  background-color: var(--bg-alt);
  border-bottom: 1px solid var(--border-light);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-navy-muted);
  margin-bottom: 16px;
  flex-wrap: wrap;
}

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

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

.breadcrumb-separator {
  color: var(--color-rose-deep);
}

.article-header-title {
  font-size: 38px;
  margin-bottom: 16px;
  line-height: 1.25;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
  color: var(--color-navy-muted);
  flex-wrap: wrap;
}

.article-layout {
  padding-top: var(--gap-xl);
  padding-bottom: var(--gap-2xl);
  display: grid;
  grid-template-columns: 2.8fr 1.2fr;
  gap: var(--gap-xl);
}

.article-body-content {
  font-size: 17px;
  line-height: 1.85;
  color: var(--color-navy);
}

.article-body-content h2 {
  font-size: 26px;
  margin-top: 2.2rem;
  margin-bottom: 1.2rem;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
  color: var(--color-navy);
}

.article-body-content h3 {
  font-size: 20px;
  margin-top: 1.8rem;
  margin-bottom: 0.9rem;
  color: var(--color-navy);
}

.article-body-content p {
  margin-bottom: 1.4rem;
  color: #37465D;
}

.article-body-content ul, 
.article-body-content ol {
  margin-bottom: 1.5rem;
  padding-left: 24px;
  color: #37465D;
}

.article-body-content li {
  margin-bottom: 8px;
}

.article-callout-box {
  background-color: var(--bg-rose-tint);
  border-left: 4px solid var(--color-rose-deep);
  padding: 20px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 2rem 0;
  font-size: 16px;
}

.article-callout-box strong {
  color: var(--color-rose-dark);
}

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

.sidebar-widget {
  background-color: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px 22px;
}

.sidebar-widget h4 {
  font-size: 17px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}

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

.related-articles-list a {
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-navy);
  display: block;
}

.related-articles-list a:hover {
  color: var(--color-rose-deep);
  text-decoration: underline;
}

/* ==========================================================================
   Responsive Breakpoints: 1440, 1024, 768, 430, 390, 375
   ========================================================================== */
@media (max-width: 1024px) {
  :root {
    --fs-h1: 42px;
    --fs-h2: 28px;
    --gap-xl: 48px;
    --gap-2xl: 72px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--gap-lg);
  }

  .hero-copy {
    padding-right: 0;
  }

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

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

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .pricing-card {
    padding: 30px 20px;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 36px;
  }

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

@media (max-width: 768px) {
  :root {
    --fs-h1: 34px;
    --fs-h2: 25px;
    --fs-h3: 20px;
    --fs-body: 16px;
    --gap-lg: 32px;
    --gap-xl: 40px;
    --gap-2xl: 56px;
  }

  .hamburger-btn {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid var(--border-light);
    gap: 16px;
  }

  .nav-links.active {
    display: flex;
  }

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

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

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

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

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

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

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

@media (max-width: 430px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

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

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

  .hero-cta-group .btn {
    width: 100%;
  }

  .transit-dashboard {
    padding: 20px 16px;
  }
}