/* ==========================================================================
   FlowerCloud 花云 - Financial Ledger Aesthetic Design System
   Palette: 
     Bone #F4F0E9 (Base background)
     Ink Brown #332D29 (Primary text & strong lines)
     Oxidized Copper #9C6A54 (Accent & ledger highlight)
     Soft Slate #DDE2DF (Muted background, rulings & fills)
   ========================================================================== */

:root {
  --color-bone: #F4F0E9;
  --color-bone-light: #FAF8F5;
  --color-bone-card: #FFFFFF;
  --color-ink: #332D29;
  --color-ink-muted: #5C544E;
  --color-ink-subtle: #7E756F;
  --color-copper: #9C6A54;
  --color-copper-dark: #7F5340;
  --color-copper-light: #F2ECE8;
  --color-copper-subtle: rgba(156, 106, 84, 0.12);
  --color-slate: #DDE2DF;
  --color-slate-light: #EDF1F0;
  --color-slate-border: #CCD3D0;
  --color-rule: rgba(51, 45, 41, 0.15);
  --color-rule-heavy: rgba(51, 45, 41, 0.35);

  --font-serif: "Songti SC", "SimSun", "Noto Serif SC", "STSong", "Songti", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --h1-size-desktop: 58px;
  --h1-size-mobile: 36px;
  --body-size: 16px;
  --line-height-body: 1.7;
  --line-height-heading: 1.25;

  --max-width: 1280px;
  --max-width-narrow: 880px;
  --transition-fast: 0.2s ease;
}

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

html {
  font-size: var(--body-size);
  background-color: var(--color-bone);
  color: var(--color-ink);
  font-family: var(--font-sans);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bone);
}

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

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

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

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

/* Tabular & Ledger Typography Helpers */
.tabular-nums {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}

.ledger-ref {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-copper);
  font-weight: 600;
}

.ledger-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 8px;
  border: 1px solid var(--color-slate-border);
  background: var(--color-slate-light);
  color: var(--color-ink-muted);
  border-radius: 2px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.ledger-tag.copper {
  border-color: var(--color-copper);
  background: var(--color-copper-light);
  color: var(--color-copper-dark);
}

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

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

.section-ruled {
  border-top: 1px solid var(--color-rule);
  padding-top: 64px;
  padding-bottom: 64px;
}

.section-ruled-double {
  border-top: 3px double var(--color-rule-heavy);
  padding-top: 64px;
  padding-bottom: 64px;
}

.section-header {
  margin-bottom: 40px;
}

.section-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-ink-muted);
  margin-top: 12px;
  max-width: 680px;
}

/* Ledger Ruled Line Element */
.ledger-rule {
  width: 100%;
  height: 1px;
  background-color: var(--color-rule);
  margin: 32px 0;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(244, 240, 233, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-rule);
}

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

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 6px;
  background: var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-bone);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  border: 1px solid var(--color-copper);
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
}

.brand-title span {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 0.85rem;
  color: var(--color-copper);
  margin-left: 6px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-ink);
  position: relative;
  padding: 6px 0;
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-copper);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-fast);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 3px;
  transition: all var(--transition-fast);
  text-decoration: none;
  font-family: var(--font-sans);
}

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

.btn-primary:hover {
  background-color: var(--color-copper-dark);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(156, 106, 84, 0.25);
}

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

.btn-secondary:hover {
  border-color: var(--color-ink);
  color: var(--color-copper-dark);
  background-color: rgba(51, 45, 41, 0.03);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

/* Mobile Menu Hamburger */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-rule);
  background: var(--color-bone-light);
  border-radius: 4px;
  cursor: pointer;
}

.mobile-menu-btn span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-ink);
  margin: 2.5px 0;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Hero Section */
.hero-section {
  padding-top: 60px;
  padding-bottom: 72px;
}

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

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 4px 12px;
  background-color: var(--color-slate-light);
  border: 1px solid var(--color-slate-border);
  border-radius: 2px;
  margin-bottom: 24px;
}

.hero-h1 {
  font-family: var(--font-serif);
  font-size: var(--h1-size-desktop);
  line-height: var(--line-height-heading);
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-h1 em {
  font-style: normal;
  color: var(--color-copper);
  border-bottom: 2px solid var(--color-copper);
}

.hero-desc {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-ink-muted);
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--color-rule);
  width: 100%;
}

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

.hero-meta-label {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-ink-subtle);
  text-transform: uppercase;
}

.hero-meta-val {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-ink);
}

/* Hero Network Ledger Dashboard */
.ledger-dashboard {
  background: var(--color-bone-card);
  border: 1px solid var(--color-rule-heavy);
  box-shadow: 0 4px 20px rgba(51, 45, 41, 0.05);
  border-radius: 4px;
  overflow: hidden;
}

.dashboard-header {
  background: var(--color-slate-light);
  border-bottom: 1px solid var(--color-slate-border);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dashboard-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-copper);
}

.dashboard-diagram {
  padding: 24px 20px 16px 20px;
  background: var(--color-bone-card);
  border-bottom: 1px solid var(--color-rule);
  display: flex;
  justify-content: center;
}

.dashboard-diagram svg {
  width: 100%;
  max-width: 420px;
  height: auto;
}

.ledger-status-table {
  width: 100%;
  border-collapse: collapse;
}

.ledger-status-table th,
.ledger-status-table td {
  padding: 10px 16px;
  text-align: left;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--color-rule);
}

.ledger-status-table th {
  background: var(--color-bone-light);
  font-family: var(--font-mono);
  color: var(--color-ink-subtle);
  font-weight: 500;
}

.ledger-status-table td {
  font-family: var(--font-mono);
  color: var(--color-ink);
}

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

.ledger-status-table .badge-active {
  color: var(--color-copper-dark);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Three Advantages Section: Open-Column Sections */
.open-columns-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--color-rule-heavy);
  border-bottom: 1px solid var(--color-rule-heavy);
}

.open-column-item {
  padding: 40px 32px;
  border-right: 1px solid var(--color-rule);
  display: flex;
  flex-direction: column;
}

.open-column-item:last-child {
  border-right: none;
}

.open-column-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-copper);
  font-weight: 600;
  margin-bottom: 16px;
}

.open-column-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 16px;
  line-height: 1.35;
}

.open-column-desc {
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
}

.open-column-footer {
  padding-top: 16px;
  border-top: 1px dashed var(--color-rule);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-ink-subtle);
}

/* Global Nodes: Ledger-Style Region Directory */
.ledger-region-directory {
  background: var(--color-bone-card);
  border: 1px solid var(--color-rule-heavy);
  border-radius: 4px;
  overflow: hidden;
}

.directory-table {
  width: 100%;
  border-collapse: collapse;
}

.directory-table th,
.directory-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--color-rule);
  vertical-align: middle;
}

.directory-table th {
  background-color: var(--color-slate-light);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-slate-border);
}

.directory-region-cell {
  display: flex;
  align-items: center;
  gap: 12px;
}

.region-code-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  background: var(--color-bone);
  border: 1px solid var(--color-rule-heavy);
  padding: 4px 8px;
  border-radius: 2px;
  color: var(--color-ink);
}

.directory-table tr:hover td {
  background-color: var(--color-bone-light);
}

.directory-note {
  padding: 16px 20px;
  background-color: var(--color-slate-light);
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  border-top: 1px solid var(--color-slate-border);
}

/* AI & Streaming Scenarios */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}

.scenario-ledger-card {
  background: var(--color-bone-card);
  border: 1px solid var(--color-rule-heavy);
  border-radius: 4px;
  padding: 32px 28px;
}

.scenario-card-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-rule);
}

.scenario-card-title {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-ink);
}

.scenario-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

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

.scenario-item-name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.scenario-item-desc {
  font-size: 0.88rem;
  color: var(--color-ink-muted);
  line-height: 1.6;
}

/* Pricing: Highly Readable Ledger Table */
.pricing-ledger-wrapper {
  background: var(--color-bone-card);
  border: 1px solid var(--color-rule-heavy);
  border-radius: 4px;
  overflow-x: auto;
}

.pricing-ledger-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
}

.pricing-ledger-table th,
.pricing-ledger-table td {
  padding: 18px 24px;
  text-align: left;
  border-bottom: 1px solid var(--color-rule);
  vertical-align: middle;
}

.pricing-ledger-table th {
  background-color: var(--color-slate-light);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-slate-border);
}

.pricing-tier-name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-ink);
}

.pricing-val {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-copper-dark);
}

.pricing-placeholder {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-ink-subtle);
  background: var(--color-bone-light);
  padding: 4px 8px;
  border: 1px dashed var(--color-slate-border);
  border-radius: 2px;
  display: inline-block;
}

.pricing-footnote {
  padding: 16px 24px;
  background-color: var(--color-bone-light);
  font-size: 0.82rem;
  color: var(--color-ink-subtle);
  border-top: 1px solid var(--color-rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* Editorial Index: Nine SEO Cards */
.editorial-index-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.editorial-card {
  background: var(--color-bone-card);
  border: 1px solid var(--color-rule);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.editorial-card::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 0%;
  height: 2px;
  background-color: var(--color-copper);
  transition: width 0.3s ease;
}

.editorial-card:hover {
  border-color: var(--color-copper);
}

.editorial-card:hover::before {
  width: calc(100% + 2px);
}

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

.editorial-index-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-copper);
  font-weight: 600;
}

.editorial-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--color-ink);
}

.editorial-title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.editorial-title a:hover {
  color: var(--color-copper);
}

.editorial-desc {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.editorial-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-copper);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--color-rule);
}

.editorial-link:hover {
  color: var(--color-copper-dark);
}

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

.testimonial-ledger-item {
  background: var(--color-bone-card);
  border: 1px solid var(--color-rule);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
}

.testimonial-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-rule);
}

.testimonial-role {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-ink);
}

.testimonial-source-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-copper);
  background: var(--color-copper-light);
  padding: 2px 6px;
  border-radius: 2px;
}

.testimonial-quote {
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  line-height: 1.65;
  font-style: normal;
  margin-bottom: 18px;
  flex-grow: 1;
}

.testimonial-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-ink-subtle);
  border-top: 1px dashed var(--color-rule);
  padding-top: 12px;
}

/* FAQ: Ledger Accordion / Ruled List */
.faq-ledger-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-rule-heavy);
}

.faq-ledger-item {
  border-bottom: 1px solid var(--color-rule);
}

.faq-ledger-summary {
  padding: 22px 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ink);
  list-style: none;
  transition: color var(--transition-fast);
}

.faq-ledger-summary::-webkit-details-marker {
  display: none;
}

.faq-ledger-summary:hover {
  color: var(--color-copper);
}

.faq-ledger-icon {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--color-copper);
  margin-left: 16px;
  transition: transform var(--transition-fast);
}

details[open] .faq-ledger-icon {
  transform: rotate(45deg);
}

.faq-ledger-content {
  padding: 0 8px 24px 8px;
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  line-height: 1.7;
}

.faq-ledger-content p {
  margin-bottom: 12px;
}

.faq-ledger-content p:last-child {
  margin-bottom: 0;
}

/* Footer Section */
.site-footer {
  background-color: var(--color-bone-light);
  border-top: 3px double var(--color-rule-heavy);
  padding-top: 56px;
  padding-bottom: 40px;
  margin-top: auto;
}

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

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-ink);
  letter-spacing: 0.05em;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-rule);
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

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

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-ink-muted);
  position: relative;
  display: inline-block;
}

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

.pbn-link {
  color: var(--color-copper-dark) !important;
  font-weight: 500;
}

.pbn-link:hover {
  text-decoration: underline;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--color-rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--color-ink-subtle);
  font-family: var(--font-mono);
}

/* Article & Secondary Page Styles */
.page-header-ledger {
  padding-top: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-rule);
  margin-bottom: 48px;
}

.breadcrumb-nav {
  margin-bottom: 16px;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-ink-subtle);
}

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

.breadcrumb-list a:hover {
  color: var(--color-copper);
}

.breadcrumb-sep {
  color: var(--color-slate-border);
}

.article-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-ink-subtle);
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-ink);
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-rule);
}

.article-body h3 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-top: 32px;
  margin-bottom: 16px;
}

.article-body p {
  margin-bottom: 20px;
}

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

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

.article-body blockquote {
  border-left: 3px solid var(--color-copper);
  background-color: var(--color-slate-light);
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 0.95rem;
  color: var(--color-ink-muted);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.92rem;
}

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

.article-body table th {
  background-color: var(--color-slate-light);
  font-family: var(--font-mono);
  font-weight: 600;
}

.article-cta-box {
  background-color: var(--color-copper-light);
  border: 1px solid var(--color-copper);
  border-radius: 4px;
  padding: 28px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.article-cta-desc {
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  margin-bottom: 20px;
}

.article-faq-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px dashed var(--color-rule-heavy);
}

.related-articles-box {
  margin-top: 48px;
  padding: 32px;
  background-color: var(--color-bone-card);
  border: 1px solid var(--color-rule);
  border-radius: 4px;
}

.related-articles-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-ink);
}

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

.related-articles-list a {
  font-size: 0.95rem;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-articles-list a:hover {
  color: var(--color-copper);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .open-column-item {
    border-right: none;
    border-bottom: 1px solid var(--color-rule);
  }

  .open-column-item:last-child {
    border-bottom: none;
  }

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

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

@media (max-width: 768px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background-color: var(--color-bone);
    border-bottom: 1px solid var(--color-rule);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    box-shadow: 0 8px 24px rgba(51, 45, 41, 0.08);
  }

  .site-nav.open {
    display: flex;
  }

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

  .hero-h1 {
    font-size: var(--h1-size-mobile);
  }

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

  .editorial-index-grid {
    grid-template-columns: 1fr;
  }

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

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

  .article-title {
    font-size: 1.85rem;
  }
}