/* ==========================================================================
   闪电猫 / Flashcat Marketing Site - Soft-Sky Minimalism CSS
   Color Palette:
   - Clean White: #FFFFFF
   - Sky Tint: #F0F6FA
   - Ink Navy: #243647
   - Muted Blue: #6C9FBD
   - Pale Sand: #E8E2D8
   ========================================================================== */

:root {
  --color-white: #FFFFFF;
  --color-sky-tint: #F0F6FA;
  --color-ink-navy: #243647;
  --color-muted-blue: #6C9FBD;
  --color-muted-blue-hover: #588CA8;
  --color-pale-sand: #E8E2D8;
  --color-sand-soft: #F6F3EE;
  --color-text-secondary: #5B7083;
  --color-border: rgba(36, 54, 71, 0.12);
  --color-border-soft: rgba(36, 54, 71, 0.06);
  --color-card-bg: #FFFFFF;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  
  --container-max: 1200px;
  --transition-normal: 0.25s ease;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-subtle: 0 4px 20px rgba(36, 54, 71, 0.05);
  --shadow-float: 0 12px 36px rgba(36, 54, 71, 0.08);
}

/* 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; /* Desktop standard */
  line-height: 1.75;
  color: var(--color-ink-navy);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* Reduced Motion */
@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;
  }
}

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

/* Typography */
h1, h2, h3, h4 {
  color: var(--color-ink-navy);
  font-weight: 500; /* Lighter headings */
  line-height: 1.3;
}

h1 {
  font-size: 52px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 34px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 22px;
  font-weight: 500;
}

h4 {
  font-size: 18px;
  font-weight: 600;
}

p {
  color: var(--color-text-secondary);
  font-size: 18px;
  margin-bottom: 1.25rem;
}

p.lead {
  font-size: 20px;
  line-height: 1.6;
}

a {
  color: var(--color-muted-blue);
  text-decoration: none;
  transition: color var(--transition-normal);
}

a:hover {
  color: var(--color-muted-blue-hover);
}

/* Full-width soft-color bands */
.band {
  width: 100%;
  padding: 96px 0;
}

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

.band-sky {
  background-color: var(--color-sky-tint);
}

.band-sand {
  background-color: var(--color-sand-soft);
}

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

.section-tag {
  display: inline-block;
  padding: 6px 14px;
  background-color: rgba(108, 159, 189, 0.12);
  color: var(--color-ink-navy);
  font-size: 14px;
  font-weight: 500;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.section-tag-sand {
  background-color: var(--color-pale-sand);
}

.section-title {
  margin-bottom: 18px;
}

.section-desc {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 17px;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--color-ink-navy);
  color: var(--color-white);
  border-color: var(--color-ink-navy);
}

.btn-primary:hover {
  background-color: #172430;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(36, 54, 71, 0.15);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-ink-navy);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: rgba(36, 54, 71, 0.04);
  color: var(--color-ink-navy);
  border-color: var(--color-ink-navy);
}

.btn-outline-sky {
  background-color: var(--color-white);
  color: var(--color-ink-navy);
  border-color: var(--color-border);
}

.btn-outline-sky:hover {
  border-color: var(--color-muted-blue);
  color: var(--color-muted-blue);
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-soft);
  height: 76px;
  display: flex;
  align-items: center;
}

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

.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink-navy);
  text-decoration: none;
}

.site-brand svg {
  width: 32px !important;
  height: 32px !important;
  min-width: 32px !important;
  max-width: 32px !important;
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}

.brand-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 4px;
  background-color: var(--color-sky-tint);
  border: 1px solid var(--color-pale-sand);
  color: var(--color-text-secondary);
}

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

.nav-links a {
  color: var(--color-ink-navy);
  font-size: 16px;
  font-weight: 400;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-muted-blue);
}

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

.hamburger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-ink-navy);
}

.hamburger-btn svg {
  width: 26px;
  height: 26px;
}

/* Mobile Menu Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 76px;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: 24px;
  box-shadow: 0 16px 32px rgba(36, 54, 71, 0.08);
  z-index: 999;
}

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

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

.mobile-nav-list a {
  font-size: 18px;
  color: var(--color-ink-navy);
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-soft);
}

.mobile-nav-cta {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Slow Route Glow Animation */
@keyframes route-glow {
  0%, 100% {
    opacity: 0.45;
    filter: drop-shadow(0 0 6px rgba(108, 159, 189, 0.3));
  }
  50% {
    opacity: 0.85;
    filter: drop-shadow(0 0 12px rgba(108, 159, 189, 0.6));
  }
}

.route-glow-effect {
  animation: route-glow 6s ease-in-out infinite;
}

/* Hero Section */
.hero-band {
  padding: 72px 0 96px 0;
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-sky-tint) 100%);
}

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

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

.hero-pill {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-pale-sand);
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-muted-blue);
}

.hero-h1 {
  margin-bottom: 20px;
}

.hero-copy {
  font-size: 20px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  padding-top: 16px;
  border-top: 1px solid var(--color-border-soft);
}

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

/* Hero Right: Layered Translucent Route Sheets Dashboard */
.hero-dashboard {
  position: relative;
  width: 100%;
  min-height: 440px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.route-sheet-back {
  position: absolute;
  top: 16px;
  right: 12px;
  left: 28px;
  bottom: 12px;
  background-color: rgba(232, 226, 216, 0.4);
  border: 1px solid rgba(36, 54, 71, 0.08);
  border-radius: var(--radius-xl);
  transform: rotate(2deg);
  z-index: 1;
}

.route-sheet-mid {
  position: absolute;
  top: 8px;
  left: 14px;
  right: 20px;
  bottom: 20px;
  background-color: rgba(240, 246, 250, 0.7);
  border: 1px solid rgba(108, 159, 189, 0.25);
  border-radius: var(--radius-xl);
  transform: rotate(-1.5deg);
  z-index: 2;
  backdrop-filter: blur(8px);
}

.route-sheet-front {
  position: relative;
  z-index: 3;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow-float);
  backdrop-filter: blur(12px);
}

.dashboard-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border-soft);
}

.dashboard-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dashboard-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background-color: var(--color-sky-tint);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted-blue);
}

.dashboard-heading {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink-navy);
}

.dashboard-sub {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.dashboard-disclaimer-pill {
  font-size: 11px;
  padding: 4px 8px;
  background: var(--color-sand-soft);
  color: var(--color-text-secondary);
  border-radius: 4px;
}

/* Abstract World-Region Flow SVG */
.region-flow-map {
  width: 100%;
  height: auto;
  display: block;
}

.region-node-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.region-node-item {
  padding: 10px 14px;
  background: var(--color-sky-tint);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.region-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.region-tag-icon {
  font-size: 12px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--color-white);
  color: var(--color-ink-navy);
  border: 1px solid var(--color-pale-sand);
}

.region-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-ink-navy);
}

.region-status-note {
  font-size: 11px;
  color: var(--color-text-secondary);
}

/* Three-Step Story Benefits */
.story-timeline {
  display: flex;
  flex-direction: column;
  gap: 48px;
  position: relative;
  max-width: 980px;
  margin: 0 auto;
}

.story-timeline::before {
  content: "";
  position: absolute;
  top: 40px;
  bottom: 40px;
  left: 28px;
  width: 2px;
  background-color: var(--color-pale-sand);
}

.story-step {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  position: relative;
}

.step-marker {
  width: 58px;
  height: 58px;
  min-width: 58px;
  border-radius: 50%;
  background-color: var(--color-white);
  border: 2px solid var(--color-muted-blue);
  color: var(--color-ink-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 600;
  z-index: 2;
  box-shadow: 0 0 0 6px var(--color-white);
}

.step-content {
  flex: 1;
  background: var(--color-white);
  padding: 36px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-subtle);
}

.step-title {
  margin-bottom: 12px;
  font-size: 24px;
}

.step-desc {
  margin-bottom: 16px;
  font-size: 17px;
}

.step-features {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.feature-pill {
  font-size: 13px;
  padding: 6px 12px;
  background-color: var(--color-sky-tint);
  border-radius: var(--radius-sm);
  color: var(--color-ink-navy);
}

/* Global Nodes Topology Band */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.node-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
}

.node-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-muted-blue);
}

.node-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.node-flag {
  font-size: 14px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  background-color: var(--color-sky-tint);
  color: var(--color-ink-navy);
  border: 1px solid var(--color-pale-sand);
}

.node-protocol-tag {
  font-size: 12px;
  color: var(--color-muted-blue);
}

.node-card h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.node-card p {
  font-size: 15px;
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.node-card-footer {
  font-size: 12px;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border-soft);
  padding-top: 12px;
}

/* Large Alternating Image-Free Sections (AI & Streaming) */
.scenario-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.scenario-section.reverse {
  direction: rtl;
}

.scenario-section.reverse > * {
  direction: ltr;
}

.scenario-text {
  display: flex;
  flex-direction: column;
}

.scenario-text h2 {
  margin-bottom: 20px;
}

.scenario-badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.service-badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  background: var(--color-white);
  border: 1px solid var(--color-pale-sand);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink-navy);
}

.scenario-visual-box {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-subtle);
}

.scenario-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.scenario-metric-item {
  padding: 16px;
  background: var(--color-sky-tint);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-soft);
}

.scenario-metric-label {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.scenario-metric-value {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink-navy);
}

/* Pricing Section (Simple comparison area, transparent placeholders) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  max-width: 1100px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  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-float);
}

.pricing-card.featured {
  border-color: var(--color-muted-blue);
  background: #FCFDFE;
  box-shadow: var(--shadow-subtle);
}

.pricing-card-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-ink-navy);
  color: var(--color-white);
  font-size: 12px;
  font-weight: 500;
  padding: 4px 14px;
  border-radius: 12px;
  letter-spacing: 0.05em;
}

.pricing-head {
  text-align: center;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border-soft);
}

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

.pricing-plan-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.pricing-currency {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink-navy);
}

.pricing-amount {
  font-size: 42px;
  font-weight: 600;
  color: var(--color-ink-navy);
  line-height: 1;
}

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

.pricing-editorial-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-muted-blue);
  background: var(--color-sky-tint);
  padding: 2px 8px;
  border-radius: 4px;
  margin-top: 10px;
}

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

.pricing-features li {
  font-size: 15px;
  color: var(--color-ink-navy);
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px dashed var(--color-border-soft);
}

.pricing-features li svg {
  width: 18px;
  height: 18px;
  color: var(--color-muted-blue);
  flex-shrink: 0;
}

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

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

.pricing-disclaimer-box {
  max-width: 900px;
  margin: 40px auto 0 auto;
  padding: 16px 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-pale-sand);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  line-height: 1.6;
}

/* Nine Article Cards Section (3 desktop / 2 tablet / 1 mobile columns) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 3 desktop columns */
  gap: 28px;
}

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

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-muted-blue);
}

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

.article-badge {
  font-size: 12px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 4px;
  background-color: var(--color-sky-tint);
  color: var(--color-ink-navy);
}

.article-read-time {
  font-size: 12px;
  color: var(--color-text-secondary);
}

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

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

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

.article-card-desc {
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  flex-grow: 1;
}

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

.article-date {
  font-size: 12px;
  color: var(--color-text-secondary);
}

.article-read-link {
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Testimonials (Visibly marked sample testimonials) */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

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

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

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-sky-tint);
  border: 1px solid var(--color-pale-sand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--color-ink-navy);
  font-size: 14px;
}

.testimonial-author-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink-navy);
}

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

.sample-notice-banner {
  margin-top: 32px;
  text-align: center;
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* FAQ Accordion */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.is-open {
  border-color: var(--color-muted-blue);
}

.faq-trigger {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 500;
  color: var(--color-ink-navy);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-trigger:hover {
  color: var(--color-muted-blue);
}

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

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

.faq-panel {
  display: none;
  padding: 0 24px 24px 24px;
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

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

/* Call to Action Banner */
.cta-banner {
  background: linear-gradient(135deg, var(--color-ink-navy) 0%, #1A2834 100%);
  color: var(--color-white);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  text-align: center;
  max-width: 1000px;
  margin: 0 auto;
}

.cta-banner h2 {
  color: var(--color-white);
  margin-bottom: 16px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 19px;
  max-width: 640px;
  margin: 0 auto 32px auto;
}

.cta-banner .btn-primary {
  background-color: var(--color-white);
  color: var(--color-ink-navy);
  border-color: var(--color-white);
}

.cta-banner .btn-primary:hover {
  background-color: var(--color-sky-tint);
}

/* Site Footer */
.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 72px 0 36px 0;
  font-size: 15px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 56px;
}

.footer-brand p {
  font-size: 15px;
  margin-top: 14px;
  color: var(--color-text-secondary);
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-ink-navy);
}

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

.footer-links a {
  color: var(--color-text-secondary);
  font-size: 15px;
}

.footer-links a:hover {
  color: var(--color-muted-blue);
}

.footer-bottom {
  border-top: 1px solid var(--color-border-soft);
  padding-top: 28px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
  padding: 24px 0;
  font-size: 14px;
}

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

.breadcrumb-item a {
  color: var(--color-text-secondary);
}

.breadcrumb-item a:hover {
  color: var(--color-muted-blue);
}

.breadcrumb-item.current {
  color: var(--color-ink-navy);
  font-weight: 500;
}

.breadcrumb-sep {
  color: var(--color-pale-sand);
}

/* Article Template Styles */
.article-header {
  margin-bottom: 40px;
}

.article-header-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.article-body {
  font-size: 18px;
  line-height: 1.85;
  color: var(--color-ink-navy);
  max-width: 840px;
}

.article-body h2 {
  font-size: 28px;
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-soft);
}

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

.article-body p {
  margin-bottom: 24px;
  color: #33475B;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 28px;
  color: #33475B;
}

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

.article-figure {
  margin: 36px 0;
  text-align: center;
}

.article-figure-img {
  width: 100%;
  max-width: 760px;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.article-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.callout-box {
  background-color: var(--color-sky-tint);
  border-left: 4px solid var(--color-muted-blue);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 32px 0;
}

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

.callout-box-sand {
  background-color: var(--color-sand-soft);
  border-left-color: #B5A898;
}

.related-articles {
  margin-top: 64px;
  padding-top: 36px;
  border-top: 1px solid var(--color-border);
}

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

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

/* 1024px to 1439px */
@media (max-width: 1024px) {
  h1 {
    font-size: 44px;
  }
  
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  
  .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .scenario-section {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .scenario-section.reverse {
    direction: ltr;
  }
  
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

/* Tablet (768px - 1023px): Article cards in 2 columns */
@media (max-width: 768px) {
  body {
    font-size: 16px;
  }
  
  p {
    font-size: 16px;
  }
  
  .band {
    padding: 64px 0;
  }
  
  .nav-links, .nav-actions {
    display: none;
  }
  
  .hamburger-btn {
    display: block;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
  }
  
  /* 9 article cards: 2 columns on tablet */
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .story-timeline::before {
    left: 20px;
  }
  
  .story-step {
    gap: 20px;
  }
  
  .step-marker {
    width: 42px;
    height: 42px;
    min-width: 42px;
    font-size: 16px;
  }
  
  .related-grid {
    grid-template-columns: 1fr;
  }
}

/* Mobile Screens (430px, 390px, 375px) */
@media (max-width: 540px) {
  body {
    font-size: 16px; /* Mobile standard */
  }
  
  h1 {
    font-size: 34px; /* Mobile standard requirement */
    line-height: 1.25;
  }
  
  h2 {
    font-size: 26px;
  }
  
  h3 {
    font-size: 20px;
  }
  
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  
  .band {
    padding: 52px 0;
  }
  
  .hero-band {
    padding: 40px 0 60px 0;
  }
  
  .hero-ctas {
    flex-direction: column;
  }
  
  .hero-ctas .btn {
    width: 100%;
  }
  
  .region-node-list {
    grid-template-columns: 1fr;
  }
  
  .nodes-grid {
    grid-template-columns: 1fr;
  }
  
  /* 9 article cards: 1 column on mobile */
  .articles-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .cta-banner {
    padding: 40px 24px;
  }
  
  .step-content {
    padding: 24px;
  }
  
  .scenario-visual-box {
    padding: 20px;
  }
  
  .scenario-metric-grid {
    grid-template-columns: 1fr;
  }
}