/* ==========================================================================
   贝雪云 Utility-Product Interface Stylesheet
   Palette:
     Background: #FFFFFF
     Text Primary: #30382E (Olive-Black)
     Accents: #768262 (Muted Olive)
     Pale Sage: #EEF1E8
     Soft Tan: #D8CCB8
   Typography:
     Body: 18px system sans-serif
     H1: 46px desktop, 33px mobile
   ========================================================================== */

:root {
  --bg-body: #FFFFFF;
  --bg-surface: #FFFFFF;
  --bg-sage: #EEF1E8;
  --bg-sage-light: #F6F8F3;
  --text-main: #30382E;
  --text-muted: #5C6858;
  --text-light: #7E8B79;
  --accent-olive: #768262;
  --accent-olive-dark: #586347;
  --accent-olive-light: rgba(118, 130, 98, 0.12);
  --tan-soft: #D8CCB8;
  --tan-border: #C8BCAB;
  --border-color: #E2DCD3;
  --border-subtle: #ECE8E1;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --container-max: 1140px;
  --header-height: 64px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-system);
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-main);
  background-color: var(--bg-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Scroll progress indicator for mobile & desktop */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background-color: var(--accent-olive);
  z-index: 1100;
  transition: width 0.1s linear;
}

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

/* Links & Buttons */
a {
  color: var(--accent-olive);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

a:hover {
  color: var(--accent-olive-dark);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-system);
  font-size: 16px;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  line-height: 1.3;
}

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

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

.btn-secondary {
  background-color: var(--bg-sage);
  color: var(--text-main);
  border-color: var(--tan-soft);
}

.btn-secondary:hover {
  background-color: #E2E8DA;
  border-color: var(--tan-border);
  color: var(--text-main);
}

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

.btn-outline:hover {
  background-color: var(--bg-sage);
  border-color: var(--accent-olive);
  color: var(--accent-olive);
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 33px; /* Mobile default */
}

@media (min-width: 1024px) {
  h1 {
    font-size: 46px; /* Desktop strict requirement */
    line-height: 1.2;
  }
}

h2 {
  font-size: 28px;
  margin-bottom: 16px;
}

@media (min-width: 1024px) {
  h2 {
    font-size: 34px;
  }
}

h3 {
  font-size: 22px;
  margin-bottom: 12px;
}

p {
  margin-bottom: 16px;
  color: var(--text-main);
}

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

.section-lead {
  font-size: 19px;
  color: var(--text-muted);
  max-width: 760px;
  margin-bottom: 32px;
}

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

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 21px;
  color: var(--text-main);
  text-decoration: none;
}

.brand-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--accent-olive);
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

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

.nav-link {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-olive);
}

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

@media (min-width: 900px) {
  .nav-links {
    display: flex;
  }
  .header-actions {
    display: flex;
  }
  .menu-toggle {
    display: none;
  }
}

/* Mobile Menu Toggle Button */
.menu-toggle {
  background: none;
  border: 1px solid var(--tan-soft);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-main);
  transition: all 0.25s ease;
}

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

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

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

/* Mobile Nav Drawer */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  background-color: #FFFFFF;
  border-bottom: 2px solid var(--tan-soft);
  box-shadow: 0 10px 25px rgba(48, 56, 46, 0.08);
  padding: 20px;
  z-index: 999;
}

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

.mobile-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

.mobile-nav .nav-link {
  font-size: 18px;
  display: block;
  padding: 6px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.mobile-nav-cta {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Sticky Desktop Section Index */
.sticky-section-index {
  display: none;
  position: sticky;
  top: var(--header-height);
  background-color: var(--bg-sage);
  border-bottom: 1px solid var(--tan-soft);
  z-index: 990;
  padding: 10px 0;
}

@media (min-width: 1024px) {
  .sticky-section-index {
    display: block;
  }
}

.section-index-list {
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  gap: 16px;
  overflow-x: auto;
  white-space: nowrap;
}

.section-index-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.section-index-link:hover,
.section-index-link.active {
  color: #FFFFFF;
  background-color: var(--accent-olive);
}

/* Main Section Wrapper */
main {
  flex: 1 0 auto;
}

section {
  padding: 60px 0;
  border-bottom: 1px solid var(--border-subtle);
}

@media (min-width: 1024px) {
  section {
    padding: 80px 0;
  }
}

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

.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-olive);
  background-color: var(--bg-sage);
  border: 1px solid var(--tan-soft);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

/* Hero Section: Left Copy / Right Network Dashboard */
.hero-section {
  padding: 50px 0 70px;
  background: linear-gradient(180deg, var(--bg-sage-light) 0%, #FFFFFF 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 50px;
  }
}

.hero-copy h1 {
  margin-bottom: 20px;
  color: var(--text-main);
}

.hero-lead {
  font-size: 19px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 30px;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 24px;
}

.hero-notes {
  font-size: 14px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

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

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

/* Network Dashboard (Control Panel Style) */
.network-dashboard {
  background-color: #FFFFFF;
  border: 2px solid var(--tan-soft);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 18px rgba(48, 56, 46, 0.05);
  overflow: hidden;
}

.dashboard-header {
  background-color: var(--bg-sage);
  padding: 14px 18px;
  border-bottom: 1px solid var(--tan-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dashboard-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: #4CAF50;
  display: inline-block;
}

.dashboard-meta {
  font-size: 12px;
  color: var(--text-muted);
  font-family: monospace;
}

/* Working Region Filters */
.dashboard-filters {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  background-color: #FAFAF8;
  overflow-x: auto;
}

.region-btn {
  flex: 1;
  min-width: 80px;
  background: none;
  border: none;
  border-right: 1px solid var(--border-color);
  padding: 12px 10px;
  font-family: var(--font-system);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  text-align: center;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.region-btn:last-child {
  border-right: none;
}

.region-btn:hover {
  background-color: var(--bg-sage);
  color: var(--text-main);
}

.region-btn.active {
  background-color: #FFFFFF;
  color: var(--accent-olive);
  border-bottom: 2px solid var(--accent-olive);
  font-weight: 700;
}

/* Dashboard Content Panel */
.dashboard-content {
  padding: 20px;
}

.dashboard-node-card {
  background-color: var(--bg-sage-light);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 18px;
  margin-bottom: 18px;
}

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

.node-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
}

.node-status-tag {
  font-size: 12px;
  font-weight: 600;
  color: #2E6038;
  background-color: #DDECD8;
  padding: 3px 8px;
  border-radius: 4px;
}

.node-meta-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  font-size: 14px;
}

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

.meta-label {
  color: var(--text-light);
  font-size: 12px;
  margin-bottom: 2px;
}

.meta-value {
  color: var(--text-main);
  font-weight: 600;
}

/* Dashboard Details Section */
.dashboard-scenario-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
}

.scenario-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background-color: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
}

.scenario-name {
  font-weight: 600;
  color: var(--text-main);
}

.scenario-support {
  font-size: 12px;
  color: var(--accent-olive);
  background-color: var(--bg-sage);
  padding: 2px 6px;
  border-radius: 4px;
}

.dashboard-footer {
  background-color: #FAFAF8;
  padding: 12px 18px;
  border-top: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Three Advantages (Open Text Sections & Compact Feature Lists) */
.advantages-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 900px) {
  .advantages-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.advantage-item {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
}

.advantage-num {
  font-size: 14px;
  font-weight: 800;
  color: var(--accent-olive);
  background-color: var(--bg-sage);
  display: inline-block;
  width: fit-content;
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 16px;
}

.advantage-item h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.advantage-desc {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 18px;
  line-height: 1.6;
}

.compact-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 15px;
}

.compact-feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

.compact-feature-list li::before {
  content: "•";
  color: var(--accent-olive);
  font-size: 18px;
}

/* Global Nodes Section */
.nodes-overview-box {
  background-color: var(--bg-sage-light);
  border: 1px solid var(--tan-soft);
  border-radius: var(--radius-md);
  padding: 30px;
  margin-bottom: 30px;
}

.nodes-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin-top: 16px;
}

.nodes-table th, .nodes-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.nodes-table th {
  background-color: var(--bg-sage);
  color: var(--text-main);
  font-weight: 700;
  font-size: 14px;
}

.nodes-table td {
  color: var(--text-muted);
}

.nodes-table td strong {
  color: var(--text-main);
}

/* AI & Streaming Use Cases */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.scenario-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
}

.scenario-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-olive);
  background-color: var(--bg-sage);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.scenario-tools-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.tool-tag {
  font-size: 13px;
  font-weight: 600;
  background-color: var(--bg-sage);
  color: var(--text-main);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--tan-soft);
}

/* Comparison Rows Section */
.comparison-container {
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--tan-soft);
  border-radius: var(--radius-md);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 16px;
  background-color: #FFFFFF;
  min-width: 600px;
}

.comparison-table th, .comparison-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.comparison-table th {
  background-color: var(--bg-sage);
  font-weight: 700;
  color: var(--text-main);
}

.comparison-table th.col-featured {
  background-color: #E2E8D8;
  color: var(--accent-olive-dark);
}

.comparison-table td.col-featured {
  background-color: #F8FAF6;
  font-weight: 600;
  color: var(--accent-olive-dark);
}

/* Pricing Section */
.pricing-header-note {
  background-color: var(--bg-sage-light);
  border-left: 4px solid var(--accent-olive);
  padding: 14px 18px;
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 30px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 30px;
}

@media (min-width: 768px) {
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pricing-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border: 2px solid var(--accent-olive);
  box-shadow: 0 4px 20px rgba(118, 130, 98, 0.12);
}

.pricing-card-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background-color: var(--accent-olive);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

.pricing-card h3 {
  font-size: 22px;
  margin-bottom: 8px;
}

.pricing-plan-type {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 18px;
}

.pricing-price-box {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.pricing-amount {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pricing-amount .currency {
  font-size: 22px;
  color: var(--accent-olive);
  font-weight: 700;
}

.pricing-amount .period {
  font-size: 15px;
  color: var(--text-muted);
  font-weight: 500;
}

.pricing-sub-price {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 6px;
}

.pricing-coupon-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: #7D5A2E;
  background-color: #FBF4E8;
  border: 1px solid #E6D2B8;
  padding: 3px 8px;
  border-radius: 4px;
  margin-top: 8px;
}

.pricing-traffic-tag {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-olive-dark);
  background-color: var(--bg-sage);
  border: 1px solid var(--tan-soft);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 26px;
  font-size: 15px;
  flex: 1 0 auto;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--text-muted);
}

.pricing-features li::before {
  content: "✓";
  color: var(--accent-olive);
  font-weight: bold;
}

/* Nine Article Cards Section (3 desktop, 2 tablet, 1 mobile) */
.articles-section {
  background-color: var(--bg-sage-light);
}

.articles-grid {
  display: grid;
  grid-template-columns: 1fr; /* Mobile: 1 col */
  gap: 24px;
}

@media (min-width: 768px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr); /* Tablet: 2 cols */
  }
}

@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr); /* Desktop: 3 cols */
  }
}

.article-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-olive);
}

.article-card-tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-olive);
  background-color: var(--bg-sage);
  display: inline-block;
  width: fit-content;
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.article-card h3 {
  font-size: 19px;
  line-height: 1.4;
  margin-bottom: 12px;
}

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

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

.article-card-excerpt {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex: 1 0 auto;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-light);
  border-top: 1px solid var(--border-subtle);
  padding-top: 14px;
}

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

/* Sample Testimonials (3-6 sourced or labeled samples) */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 900px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.testimonial-label {
  font-size: 12px;
  font-weight: 700;
  color: #7D6B42;
  background-color: #FAF6ED;
  border: 1px solid var(--tan-soft);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 14px;
  width: fit-content;
}

.testimonial-quote {
  font-size: 16px;
  color: var(--text-main);
  line-height: 1.65;
  margin-bottom: 18px;
  flex: 1 0 auto;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border-subtle);
  padding-top: 12px;
}

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

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

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

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

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 18px 20px;
  font-family: var(--font-system);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease;
}

.faq-question:hover {
  background-color: var(--bg-sage-light);
}

.faq-question .faq-icon {
  font-size: 20px;
  font-weight: 400;
  color: var(--accent-olive);
  transition: transform 0.2s ease;
}

.faq-item.active .faq-question .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 20px 20px 20px;
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

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

/* Article Template Styles */
.article-header {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 36px;
}

.breadcrumb-nav {
  margin-bottom: 18px;
  font-size: 14px;
}

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

.breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
}

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

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

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

.article-content {
  max-width: 820px;
  margin: 0 auto 60px;
  font-size: 18px;
  line-height: 1.8;
}

.article-content h2 {
  font-size: 26px;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  font-size: 21px;
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-content ul, .article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
  color: var(--text-main);
}

.article-callout {
  background-color: var(--bg-sage);
  border-left: 4px solid var(--accent-olive);
  padding: 18px 22px;
  margin: 28px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-callout p {
  margin-bottom: 0;
  font-size: 16px;
  color: var(--text-main);
}

.article-image-box {
  margin: 32px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: #FAFAF8;
}

.article-image-box img {
  width: 100%;
  height: auto;
}

.article-image-caption {
  font-size: 14px;
  color: var(--text-muted);
  text-align: center;
  padding: 10px;
  background-color: var(--bg-sage-light);
  border-top: 1px solid var(--border-subtle);
}

.article-toc {
  background-color: var(--bg-sage-light);
  border: 1px solid var(--tan-soft);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 24px 0 36px;
}

.article-toc-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.article-toc ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 15px;
}

.related-articles-section {
  border-top: 1px solid var(--border-color);
  padding-top: 40px;
  margin-top: 50px;
}

.related-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 20px;
}

@media (min-width: 768px) {
  .related-articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Secondary Pages (About, Terms, Privacy, Sitemap, Tutorial) */
.page-container {
  max-width: 860px;
  margin: 40px auto 70px;
}

.page-header {
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.sitemap-group {
  margin-bottom: 36px;
}

.sitemap-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 14px;
}

.sitemap-list li {
  padding-left: 16px;
  position: relative;
}

.sitemap-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent-olive);
}

/* Footer Section */
.site-footer {
  background-color: #FAFAF8;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 30px;
  font-size: 15px;
  color: var(--text-muted);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 40px;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
}

.footer-brand h4 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--text-main);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-muted);
}

.footer-col h5 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

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

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

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-light);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

/* Accessibility & Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

:focus-visible {
  outline: 2px solid var(--accent-olive);
  outline-offset: 2px;
}