/* ==========================================================================
   Swiss Editorial Grid Design System for 91机场
   Palette:
     - Background: #FFFFFF (White)
     - Text / Near-black: #17191B
     - Borders / Dividers: #E8EAEC (Cool Gray)
     - Accent: #345FA8 (Restrained Cobalt)
     - Subtle Surface: #F7F8F9
     - Muted Text: #5B626A
   ========================================================================== */

:root {
  --color-bg: #FFFFFF;
  --color-text: #17191B;
  --color-muted: #5B626A;
  --color-border: #E8EAEC;
  --color-border-dark: #C9CED4;
  --color-accent: #345FA8;
  --color-accent-hover: #264780;
  --color-surface: #F8F9FA;
  --color-surface-hover: #F0F2F5;
  --color-surface-tint: #F2F5FA;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --max-width: 1240px;
  --header-height: 72px;
  --border-radius: 2px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::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: 17px;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

h1 {
  font-size: 2.25rem; /* 36px mobile */
  line-height: 1.15;
}

@media (min-width: 992px) {
  h1 {
    font-size: 3.75rem; /* 60px desktop */
    line-height: 1.1;
  }
}

h2 {
  font-size: 1.85rem;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

@media (min-width: 992px) {
  h2 {
    font-size: 2.5rem;
  }
}

h3 {
  font-size: 1.25rem;
  line-height: 1.3;
}

@media (min-width: 992px) {
  h3 {
    font-size: 1.45rem;
  }
}

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

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

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

/* Grid & Layout */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container {
    padding-left: 32px;
    padding-right: 32px;
  }
}

.grid-12 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .grid-12 {
    grid-template-columns: repeat(12, 1fr);
  }
}

/* Editorial Dividers & Labels */
.section-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0;
  width: 100%;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1rem;
}

.section-label::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
}

.section-heading-group {
  margin-bottom: 2.5rem;
}

.section-desc {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-muted);
  max-width: 760px;
}

/* Section Spacing */
.section {
  padding-top: 4.5rem;
  padding-bottom: 4.5rem;
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 992px) {
  .section {
    padding-top: 6rem;
    padding-bottom: 6rem;
  }
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.03em;
  text-decoration: none;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 2px 6px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  border-radius: var(--border-radius);
  letter-spacing: 0.04em;
}

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

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  padding: 6px 0;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width 0.2s ease;
}

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

.header-cta-wrap {
  display: none;
  align-items: center;
  gap: 12px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  cursor: pointer;
  padding: 0;
}

.mobile-menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  transition: var(--transition);
}

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

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

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

/* Mobile Nav Drawer */
.mobile-nav-panel {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: #FFFFFF;
  border-bottom: 2px solid var(--color-text);
  padding: 24px 20px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

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

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.mobile-nav-link {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 992px) {
  .nav-links, .header-cta-wrap {
    display: flex;
  }
  .mobile-menu-toggle {
    display: none;
  }
  .mobile-nav-panel {
    display: none !important;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--border-radius);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  line-height: 1.3;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: #FFFFFF;
  text-decoration: none;
}

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

.btn-outline:hover {
  background-color: var(--color-text);
  color: #FFFFFF;
  text-decoration: none;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-full {
  width: 100%;
}

/* Hero Section */
.hero-section {
  padding-top: 3.5rem;
  padding-bottom: 4.5rem;
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

@media (min-width: 992px) {
  .hero-section {
    padding-top: 5.5rem;
    padding-bottom: 6rem;
  }
}

.hero-left {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

@media (min-width: 992px) {
  .hero-left {
    grid-column: 1 / 7;
  }
}

.hero-title {
  margin-top: 0.5rem;
  margin-bottom: 1.5rem;
}

.hero-subhead {
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--color-muted);
  margin-bottom: 2rem;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-bottom: 2rem;
}

.hero-trust-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.hero-trust-item::before {
  content: "✓";
  color: var(--color-accent);
  font-weight: bold;
}

/* Right-side Illustrative Dashboard */
.hero-right {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
}

@media (min-width: 992px) {
  .hero-right {
    grid-column: 7 / 13;
  }
}

.dash-panel {
  width: 100%;
  border: 1px solid var(--color-border-dark);
  background-color: var(--color-surface);
  border-radius: var(--border-radius);
  overflow: hidden;
}

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

.dash-header-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.dash-status-indicator {
  display: inline-block;
  width: 7px;
  height: 7px;
  background-color: #10B981;
  border-radius: 50%;
}

.dash-meta-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
}

.dash-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.dash-layer-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-muted);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.dash-routes {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dash-route-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.dash-route-item:hover {
  border-color: var(--color-accent);
}

.dash-region-badge {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: 8px;
}

.dash-region-flag {
  font-family: var(--font-mono);
  background-color: var(--color-surface-tint);
  padding: 2px 6px;
  border-radius: 2px;
  font-size: 0.75rem;
}

.dash-route-type {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.dash-spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
}

.dash-spec-box {
  padding: 8px 12px;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
}

.dash-spec-label {
  font-size: 0.75rem;
  color: var(--color-muted);
}

.dash-spec-val {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
}

.dash-footer-note {
  font-size: 0.75rem;
  color: var(--color-muted);
  text-align: right;
  font-family: var(--font-mono);
  padding-top: 6px;
}

/* Motion: Subtle One-Time Line Reveal */
.reveal-line {
  position: relative;
  width: 100%;
  height: 1px;
  background-color: var(--color-border);
  overflow: hidden;
}

.reveal-line::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-accent);
  transform: translateX(-100%);
  animation: lineReveal 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards 0.2s;
}

@keyframes lineReveal {
  to {
    transform: translateX(100%);
  }
}

/* Three Benefits Section */
.benefit-card {
  grid-column: 1 / -1;
  border: 1px solid var(--color-border);
  padding: 32px 28px;
  background-color: #FFFFFF;
  transition: var(--transition);
}

.benefit-card:hover {
  border-color: var(--color-accent);
  background-color: var(--color-surface-tint);
}

@media (min-width: 768px) {
  .benefit-card {
    grid-column: span 4;
  }
}

.benefit-num {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
  display: block;
}

.benefit-card h3 {
  margin-bottom: 0.75rem;
}

.benefit-card p {
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Global Nodes Section */
.nodes-intro {
  grid-column: 1 / -1;
  margin-bottom: 1rem;
}

@media (min-width: 992px) {
  .nodes-intro {
    grid-column: 1 / 9;
  }
}

.node-card {
  grid-column: 1 / -1;
  border: 1px solid var(--color-border);
  padding: 24px;
  background-color: #FFFFFF;
  transition: var(--transition);
}

.node-card:hover {
  border-color: var(--color-border-dark);
  background-color: var(--color-surface);
}

@media (min-width: 768px) {
  .node-card {
    grid-column: span 6;
  }
}

@media (min-width: 992px) {
  .node-card {
    grid-column: span 3;
  }
}

.node-code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-accent);
  font-weight: 700;
  display: block;
  margin-bottom: 8px;
}

.node-name {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.node-desc {
  font-size: 0.875rem;
  margin-bottom: 12px;
}

.node-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.node-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 2px 6px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
}

/* Use Cases: AI & Streaming (Not a logo wall) */
.usecase-box {
  grid-column: 1 / -1;
  border: 1px solid var(--color-border);
  padding: 32px 28px;
  background-color: #FFFFFF;
}

@media (min-width: 992px) {
  .usecase-box {
    grid-column: span 6;
  }
}

.usecase-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.usecase-item-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.usecase-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 16px;
  background-color: var(--color-surface);
  border-left: 3px solid var(--color-accent);
}

.usecase-item-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.usecase-item-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: normal;
  color: var(--color-accent);
}

.usecase-item-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.5;
  margin: 0;
}

/* Pricing Comparison Table */
.pricing-wrapper {
  grid-column: 1 / -1;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  background-color: #FFFFFF;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
  text-align: left;
  font-size: 0.9375rem;
}

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

.pricing-table th:last-child,
.pricing-table td:last-child {
  border-right: none;
}

.pricing-table thead th {
  background-color: var(--color-surface);
  font-weight: 700;
  font-size: 1.05rem;
  vertical-align: top;
}

.pricing-plan-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 6px;
  background-color: var(--color-surface-tint);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
  margin-bottom: 6px;
}

.pricing-price {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text);
  margin-top: 4px;
}

.pricing-price small {
  font-size: 0.8125rem;
  font-weight: normal;
  color: var(--color-muted);
}

.pricing-table tbody tr:hover {
  background-color: var(--color-surface-tint);
}

.pricing-feature-name {
  font-weight: 600;
  color: var(--color-text);
  width: 22%;
  background-color: var(--color-surface);
}

.pricing-notice-box {
  margin-top: 20px;
  padding: 16px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* Numbered Editorial Article Cards (9 Cards) */
/* 3 cols desktop, 2 cols tablet, 1 col mobile */
.article-cards-grid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .article-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .article-cards-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  background-color: #FFFFFF;
  padding: 24px;
  transition: var(--transition);
  position: relative;
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  border-color: var(--color-accent);
  text-decoration: none;
  background-color: var(--color-surface);
  transform: translateY(-2px);
}

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

.article-card-num {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
}

.article-card-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 2px 8px;
  background-color: var(--color-surface-tint);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--color-text);
}

.article-card-summary {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 18px;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.article-card-readmore {
  color: var(--color-accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Testimonials (Sample Data Clearly Identified) */
.testimonial-card {
  grid-column: 1 / -1;
  border: 1px solid var(--color-border);
  padding: 28px;
  background-color: #FFFFFF;
}

@media (min-width: 768px) {
  .testimonial-card {
    grid-column: span 6;
  }
}

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

.testimonial-sample-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-muted);
  background-color: var(--color-surface);
  padding: 2px 6px;
  border: 1px solid var(--color-border);
}

.testimonial-quote {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text);
  margin-bottom: 16px;
  position: relative;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 40px;
  height: 40px;
  background-color: var(--color-surface-tint);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-accent);
}

.testimonial-name {
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-text);
}

.testimonial-role {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* FAQ Accordion */
.faq-wrapper {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (min-width: 992px) {
  .faq-wrapper {
    grid-column: 2 / 12;
  }
}

.faq-item {
  border: 1px solid var(--color-border);
  background-color: #FFFFFF;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: var(--color-accent);
}

.faq-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

.faq-icon {
  width: 18px;
  height: 18px;
  position: relative;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background-color: var(--color-text);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-icon::before {
  width: 14px;
  height: 2px;
}

.faq-icon::after {
  width: 2px;
  height: 14px;
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq-content {
  padding: 0 24px 20px 24px;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-muted);
  border-top: 1px dashed var(--color-border);
  padding-top: 16px;
}

.faq-content p {
  margin-bottom: 0.75rem;
}

/* Footer */
.site-footer {
  background-color: #FFFFFF;
  border-top: 2px solid var(--color-text);
  padding-top: 4.5rem;
  padding-bottom: 3.5rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 3.5rem;
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: repeat(12, 1fr);
  }
}

.footer-brand-col {
  grid-column: 1 / -1;
}

@media (min-width: 768px) {
  .footer-brand-col {
    grid-column: span 5;
  }
}

.footer-links-col {
  grid-column: 1 / -1;
}

@media (min-width: 768px) {
  .footer-links-col {
    grid-column: span 7;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: 1rem;
}

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

.footer-link-list a {
  font-size: 0.875rem;
  color: var(--color-muted);
}

.footer-link-list a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 0.8125rem;
  color: var(--color-muted);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer-partner-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.footer-partner-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-muted);
}

/* Article Template Styles */
.article-header {
  padding-top: 3.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-bottom: 1.25rem;
}

.breadcrumbs a {
  color: var(--color-muted);
}

.breadcrumbs a:hover {
  color: var(--color-accent);
}

.breadcrumbs-sep {
  color: var(--color-border-dark);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-top: 1.25rem;
}

.article-content-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  padding-top: 3.5rem;
  padding-bottom: 4.5rem;
}

@media (min-width: 992px) {
  .article-content-layout {
    grid-template-columns: 8fr 4fr;
  }
}

.prose {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-text);
}

.prose h2 {
  font-size: 1.75rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.prose h3 {
  font-size: 1.3rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.prose p {
  color: #2F3337;
  margin-bottom: 1.5rem;
}

.prose ul, .prose ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.prose li {
  margin-bottom: 0.5rem;
  color: #2F3337;
}

.prose blockquote {
  border-left: 4px solid var(--color-accent);
  padding: 14px 20px;
  background-color: var(--color-surface);
  margin: 1.75rem 0;
  font-style: italic;
  color: var(--color-muted);
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 2px 6px;
  border-radius: 2px;
}

.prose pre {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 1.75rem;
}

.prose pre code {
  background: none;
  border: none;
  padding: 0;
}

.prose figure {
  margin: 2rem 0;
  border: 1px solid var(--color-border);
  padding: 12px;
  background-color: var(--color-surface);
}

.prose figcaption {
  font-size: 0.8125rem;
  color: var(--color-muted);
  text-align: center;
  margin-top: 8px;
  font-family: var(--font-mono);
}

/* Sidebar Styles */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  border: 1px solid var(--color-border);
  padding: 24px;
  background-color: #FFFFFF;
}

.sidebar-widget-title {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: 1rem;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

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

.related-article-link {
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.45;
  color: var(--color-text);
  display: block;
}

.related-article-link:hover {
  color: var(--color-accent);
}

/* SVG illustrations / Diagram box */
.diagram-box {
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  padding: 20px;
  margin: 24px 0;
}

.diagram-header {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-muted);
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: 8px 16px;
  z-index: 10000;
  text-decoration: none;
  font-weight: bold;
}

.skip-link:focus {
  top: 0;
}