/* ==========================================================================
   KuaiLeiGO Acceleration Network - Architectural Blueprint Theme Design
   Color Specs:
   - Primary BG: #FFFFFF
   - Alt BG: #F3F5F4
   - Title/Headings: #1E272C
   - Body Text: #607079
   - Slate Muted: #8A9A9E
   - Brand Slate Blue: #3C6072 (Primary Accent)
   - Terracotta Orange: #BB8066 (Highlight Accent)
   - Border Color: #D9E0E1
   ========================================================================== */

:root {
  --bg-main: #FFFFFF;
  --bg-alt: #F3F5F4;
  --bg-card: #FFFFFF;
  --text-title: #1E272C;
  --text-body: #607079;
  --text-muted: #8A9A9E;
  --brand-primary: #3C6072;
  --brand-primary-hover: #2C4856;
  --brand-primary-light: #EEF3F5;
  --accent-orange: #BB8066;
  --accent-orange-hover: #A0674F;
  --accent-orange-light: #FAF2EF;
  --border-color: #D9E0E1;
  --border-dark: #B0BCBF;
  --grid-line: rgba(60, 96, 114, 0.08);
  --grid-line-strong: rgba(60, 96, 114, 0.15);
  --success-color: #2E7D32;
  --success-bg: #E8F5E9;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Segoe UI Mono", "Consolas", "Courier New", monospace;

  --max-width: 1200px;
  --header-height: 72px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --box-shadow-subtle: 0 4px 16px rgba(30, 39, 44, 0.04);
  --box-shadow-hover: 0 8px 24px rgba(30, 39, 44, 0.08);
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Base Styles */
*, *::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);
  background-color: var(--bg-main);
  color: var(--text-body);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--brand-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--brand-primary-hover);
}

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Blueprint Grid Background Pattern */
.bg-grid-pattern {
  background-color: var(--bg-main);
  background-image: 
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
}

.bg-grid-pattern-alt {
  background-color: var(--bg-alt);
  background-image: 
    linear-gradient(to right, var(--grid-line-strong) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line-strong) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* Typography Utility */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-title);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--brand-primary);
  background-color: var(--brand-primary-light);
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.mono-tag.orange {
  color: var(--accent-orange);
  background-color: var(--accent-orange-light);
  border-color: rgba(187, 128, 102, 0.3);
}

.mono-tag .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
}

.section-tagline {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--brand-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-tagline::before {
  content: "//";
  color: var(--accent-orange);
  font-weight: bold;
}

.section-title {
  font-size: 2rem;
  color: var(--text-title);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  max-width: 680px;
}

.section-header {
  margin-bottom: 48px;
  position: relative;
}

.section-header.center {
  text-align: center;
}

.section-header.center .section-desc {
  margin-left: auto;
  margin-right: auto;
}

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

/* Blueprint Line Decoration Container */
.blueprint-box {
  position: relative;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.blueprint-box::before, .blueprint-box::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 6px;
  border-style: solid;
  border-color: var(--brand-primary);
  pointer-events: none;
  opacity: 0.5;
}

.blueprint-box::before {
  top: -1px;
  left: -1px;
  border-width: 2px 0 0 2px;
}

.blueprint-box::after {
  bottom: -1px;
  right: -1px;
  border-width: 0 2px 2px 0;
}

.blueprint-box:hover {
  border-color: var(--border-dark);
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--brand-primary);
  color: #FFFFFF;
  border-color: var(--brand-primary);
  box-shadow: 0 2px 8px rgba(60, 96, 114, 0.2);
}

.btn-primary:hover {
  background-color: var(--brand-primary-hover);
  border-color: var(--brand-primary-hover);
  color: #FFFFFF;
  transform: translateY(-1px);
}

.btn-accent {
  background-color: var(--accent-orange);
  color: #FFFFFF;
  border-color: var(--accent-orange);
  box-shadow: 0 2px 8px rgba(187, 128, 102, 0.25);
}

.btn-accent:hover {
  background-color: var(--accent-orange-hover);
  border-color: var(--accent-orange-hover);
  color: #FFFFFF;
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  background-color: var(--brand-primary-light);
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

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

.btn-lg {
  padding: 16px 32px;
  font-size: 1.05rem;
}

/* ==========================================================================
   HEADER & NAVIGATION TOOLBAR
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-title);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.03em;
}

.brand-logo svg {
  width: 28px;
  height: 28px;
  color: var(--brand-primary);
}

.brand-logo .brand-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  background-color: var(--brand-primary-light);
  color: var(--brand-primary);
  border: 1px solid var(--border-color);
  padding: 1px 5px;
  border-radius: 2px;
  vertical-align: super;
}

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

.nav-link {
  color: var(--text-title);
  font-weight: 500;
  font-size: 0.925rem;
  padding: 6px 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--brand-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--brand-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  padding: 8px;
  border-radius: var(--radius-sm);
  color: var(--text-title);
  cursor: pointer;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  padding: 64px 0 72px 0;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

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

.hero-meta {
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.hero-title {
  font-size: 2.75rem;
  line-height: 1.2;
  color: var(--text-title);
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero-title span.highlight {
  color: var(--brand-primary);
  border-bottom: 2px solid var(--accent-orange);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-body);
  margin-bottom: 32px;
  line-height: 1.7;
}

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

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

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-title);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* TOPOLOGY PANEL (SVG/CSS Network Blueprint Panel) */
.hero-topology-panel {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  position: relative;
  box-shadow: var(--box-shadow-subtle);
}

.topology-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.topology-status {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--success-color);
  font-weight: 600;
}

.topology-status .ping-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--success-color);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(46, 125, 50, 0.4); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(46, 125, 50, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(46, 125, 50, 0); }
}

.topology-svg-wrapper {
  width: 100%;
  height: 320px;
  position: relative;
}

.topology-svg-wrapper svg {
  width: 100%;
  height: 100%;
}

.topology-footer {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   ADVANTAGES SECTION (Numbered Info Strips)
   ========================================================================== */
.advantages-section {
  padding: 80px 0;
  background-color: var(--bg-alt);
  border-bottom: 1px solid var(--border-color);
}

.advantage-strips {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.strip-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 28px 32px;
  display: grid;
  grid-template-columns: 80px 1.2fr 1.8fr;
  align-items: center;
  gap: 24px;
  transition: all var(--transition-normal);
  position: relative;
}

.strip-item:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--box-shadow-hover);
  transform: translateX(4px);
}

.strip-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--brand-primary);
  opacity: 0.8;
  display: flex;
  align-items: center;
}

.strip-num::after {
  content: "/";
  font-size: 1.2rem;
  color: var(--accent-orange);
  margin-left: 6px;
}

.strip-title-area {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.strip-title {
  font-size: 1.25rem;
  color: var(--text-title);
}

.strip-subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.strip-desc {
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   GLOBAL NODES SECTION (Blueprint Route/Map Layout)
   ========================================================================== */
.nodes-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
}

.nodes-filter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 8px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover, .filter-btn.active {
  background-color: var(--brand-primary);
  color: #FFFFFF;
  border-color: var(--brand-primary);
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 20px;
}

.node-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-card:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--box-shadow-subtle);
  transform: translateY(-2px);
}

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

.node-region {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--text-title);

}

.node-flag {
  font-size: 1.2rem;
  line-height: 1;
}

.node-specs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--text-muted);
  padding-top: 8px;
  border-top: 1px dashed var(--border-color);
}

.node-latency {
  color: var(--success-color);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   AI & STREAMING UNLOCK SECTION (Grouped Scenarios)
   ========================================================================== */
.scenarios-section {
  padding: 80px 0;
  background-color: var(--bg-alt);
  border-bottom: 1px solid var(--border-color);
}

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

.scenario-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  height: 100%;
}

.scenario-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background-color: var(--brand-primary-light);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.scenario-icon svg {
  width: 24px;
  height: 24px;
}

.scenario-card h3 {
  font-size: 1.25rem;
}

.scenario-card p {
  font-size: 0.925rem;
  color: var(--text-body);
  line-height: 1.6;
}

.scenario-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px dashed var(--border-color);
}

.scenario-tag-item {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-title);
  background-color: var(--bg-alt);
  border: 1px solid var(--border-color);
  padding: 4px 8px;
  border-radius: 2px;
}

/* ==========================================================================
   PRICING / PACKAGES SECTION
   ========================================================================== */
.pricing-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.price-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.price-card.popular {
  border-color: var(--accent-orange);
  box-shadow: 0 8px 32px rgba(187, 128, 102, 0.12);
}

.popular-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background-color: var(--accent-orange);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 2px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.price-header {
  margin-bottom: 20px;
}

.price-title {
  font-size: 1.25rem;
  color: var(--text-title);
  margin-bottom: 4px;
}

.price-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.price-amount {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-title);
  margin-bottom: 20px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.price-amount .currency {
  font-size: 1.25rem;
}

.price-amount .period {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 400;
}

.price-features {
  list-style: none;
  margin-bottom: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.9rem;
}

.price-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-body);
}

.price-features li svg {
  width: 16px;
  height: 16px;
  color: var(--brand-primary);
  flex-shrink: 0;
}

.price-card .btn {
  margin-top: auto;
  width: 100%;
}

/* ==========================================================================
   KNOWLEDGE BASE & 9 ARTICLES SECTION (Blueprint Doc Cover Cards)
   ========================================================================== */
.knowledge-section {
  padding: 80px 0;
  background-color: var(--bg-alt);
  border-bottom: 1px solid var(--border-color);
}

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

.article-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
  position: relative;
}

.article-card:hover {
  border-color: var(--brand-primary);
  box-shadow: var(--box-shadow-hover);
  transform: translateY(-2px);
}

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

.doc-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--brand-primary);
  font-weight: 600;
}

.doc-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.article-card h3 {
  font-size: 1.125rem;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-title);
}

.article-card p {
  font-size: 0.875rem;
  color: var(--text-body);
  line-height: 1.6;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--brand-primary);
}

/* ==========================================================================
   USER REVIEWS / TESTIMONIALS
   ========================================================================== */
.reviews-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.review-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.review-stars {
  color: #E6A23C;
  display: flex;
  gap: 4px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.6;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px dashed var(--border-color);
}

.avatar-initial {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--brand-primary-light);
  color: var(--brand-primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.author-info h4 {
  font-size: 0.95rem;
  color: var(--text-title);
}

.author-info p {
  font-size: 0.775rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ SECTION
   ========================================================================== */
.faq-section {
  padding: 80px 0;
  background-color: var(--bg-alt);
  border-bottom: 1px solid var(--border-color);
}

.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-question {
  padding: 20px 24px;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-title);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-question svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-fast);
  color: var(--brand-primary);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
  padding: 0 24px;
  color: var(--text-body);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  padding: 0 24px 20px 24px;
  max-height: 500px;
}

/* ==========================================================================
   FOOTER SECTION
   ========================================================================== */
.site-footer {
  background-color: var(--text-title);
  color: #A0B0B8;
  padding: 64px 0 32px 0;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  color: #FFFFFF;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand p {
  color: #8A9A9E;
  margin-bottom: 20px;
  max-width: 320px;
  font-size: 0.875rem;
}

.footer-title {
  color: #FFFFFF;
  font-size: 0.95rem;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

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

.footer-links a {
  color: #A0B0B8;
}

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

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

/* ==========================================================================
   ARTICLE LAYOUT STYLES (Single Article Pages)
   ========================================================================== */
.article-header-section {
  padding: 60px 0 40px 0;
  background-color: var(--bg-alt);
  border-bottom: 1px solid var(--border-color);
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

.article-content {
  padding: 48px 0;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-body);
}

.article-content h2 {
  font-size: 1.6rem;
  margin: 40px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-title);
}

.article-content h3 {
  font-size: 1.25rem;
  margin: 28px 0 12px 0;
  color: var(--text-title);
}

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

.article-content ul, .article-content ol {
  margin: 0 0 24px 24px;
}

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

.article-content blockquote {
  background-color: var(--bg-alt);
  border-left: 4px solid var(--brand-primary);
  padding: 16px 20px;
  margin: 24px 0;
  font-style: italic;
  color: var(--text-title);
}

.article-cta-box {
  background-color: var(--brand-primary-light);
  border: 1px solid var(--brand-primary);
  border-radius: var(--radius-sm);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-box h3 {
  margin-top: 0;
  color: var(--text-title);
}

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

/* Code block in article */
.code-block {
  background-color: #1E272C;
  color: #E2E8F0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 20px 0;
}

/* Data Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.925rem;
}

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

.data-table th {
  background-color: var(--bg-alt);
  color: var(--text-title);
  font-weight: 600;
}

/* ==========================================================================
   RESPONSIVE DESIGN & MEDIA QUERIES
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .scenarios-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .strip-item {
    grid-template-columns: 60px 1fr;
    gap: 16px;
  }
  
  .strip-desc {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 20px 24px;
    box-shadow: var(--box-shadow-hover);
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .pricing-grid, .scenarios-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .strip-item {
    grid-template-columns: 1fr;
  }
}

/* Accessibility: Support prefers-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;
  }
}