/* ==========================================================================
   Beixueyun / 贝雪云 贝雪云 官方中文主页与综合指南 核心样式库
   Visual Concept: Warm Architectural Portfolio
   Palette: Off-White #FBF9F5, Terracotta #9C5545, Warm Black #2B2725, Pale Stone #E9E3DA
   Typography: Chinese Serif Fallback for Headings, Clean System Sans for Body
   ========================================================================== */

:root {
  --bg-primary: #FBF9F5;
  --bg-surface: #FFFFFF;
  --bg-surface-warm: #F5EFE8;
  --bg-surface-dim: #ECE6DD;
  --text-primary: #2B2725;
  --text-secondary: #5D5652;
  --text-muted: #7E756F;
  --accent-terracotta: #9C5545;
  --accent-hover: #7E4133;
  --accent-light: #F2E8E4;
  --stone-pale: #E9E3DA;
  --stone-line: #DDD5CA;
  --stone-dark: #B3ABA2;
  
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --h1-desktop: 58px;
  --h1-mobile: 36px;
  --body-size: 17px;
  --line-height-body: 1.75;
  --line-height-tight: 1.25;

  --container-max: 1280px;
  --container-narrow: 860px;
  --section-pad: 88px;
  --section-pad-mobile: 56px;
  
  --shadow-architectural: 0 4px 20px rgba(43, 39, 37, 0.05);
  --border-architectural: 1px solid var(--stone-line);
}

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

html {
  font-size: var(--body-size);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: var(--line-height-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  background-color: var(--bg-primary);
  background-image: 
    linear-gradient(to right, rgba(233, 227, 218, 0.28) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(233, 227, 218, 0.28) 1px, transparent 1px);
  background-size: 64px 64px;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

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

ul, ol {
  list-style: none;
}

/* Typography Scale */
h1, h2, h3, h4, .font-serif {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--text-primary);
  line-height: var(--line-height-tight);
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--h1-desktop);
  line-height: 1.15;
}

h2 {
  font-size: 34px;
  line-height: 1.25;
  margin-bottom: 16px;
}

h3 {
  font-size: 22px;
  line-height: 1.35;
  margin-bottom: 12px;
}

h4 {
  font-size: 18px;
  line-height: 1.4;
}

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

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

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

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

.thin-rule {
  height: 1px;
  background-color: var(--stone-line);
  border: none;
  width: 100%;
  margin: 0;
}

.section-pad {
  padding-top: var(--section-pad);
  padding-bottom: var(--section-pad);
  position: relative;
}

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

.chapter-number {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent-terracotta);
  display: block;
  margin-bottom: 12px;
}

.chapter-number::before {
  content: "§ ";
}

.section-subtitle {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 680px;
}

/* Geometric Crop & Notch Details */
.corner-notch {
  position: relative;
}

.corner-notch::before {
  content: "+";
  position: absolute;
  top: -8px;
  left: -8px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent-terracotta);
  pointer-events: none;
}

.corner-notch-tr::after {
  content: "+";
  position: absolute;
  top: -8px;
  right: -8px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent-terracotta);
  pointer-events: none;
}

/* Button & Link UI */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: 0;
  text-align: center;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

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

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

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--text-primary);
}

.btn-outline:hover {
  background-color: var(--text-primary);
  color: var(--bg-primary);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(251, 249, 245, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--border-architectural);
}

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

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

.brand-symbol {
  width: 32px;
  height: 32px;
  background-color: var(--accent-terracotta);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  border: 1px solid var(--text-primary);
}

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

.brand-title {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
}

.brand-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--accent-terracotta);
  text-transform: uppercase;
}

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

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

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

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

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

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--stone-line);
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.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);
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  height: calc(100vh - 72px);
  background-color: var(--bg-primary);
  padding: 32px 24px;
  overflow-y: auto;
  border-top: var(--border-architectural);
  z-index: 99;
}

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

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 32px;
}

.mobile-nav-link {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  border-bottom: 1px solid var(--stone-line);
  padding-bottom: 12px;
}

.mobile-nav-link:hover {
  color: var(--accent-terracotta);
}

/* ==========================================================================
   Hero Section: Architectural Blueprint & Route Map
   ========================================================================== */
.hero-section {
  padding-top: 64px;
  padding-bottom: 72px;
  position: relative;
}

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

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-tagline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 4px 10px;
  background-color: var(--accent-light);
  color: var(--accent-terracotta);
  border: 1px solid var(--stone-line);
  margin-bottom: 24px;
}

.hero-title {
  margin-bottom: 24px;
}

.hero-title span.accent-italic {
  font-style: italic;
  color: var(--accent-terracotta);
  font-weight: 600;
}

.hero-desc {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 580px;
}

.hero-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px dashed var(--stone-line);
}

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

.meta-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.meta-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 2px;
}

/* Route Map Dashboard (Floor-plan architectural schematic) */
.blueprint-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--text-primary);
  box-shadow: 10px 10px 0px var(--stone-pale);
  padding: 24px;
  position: relative;
}

.blueprint-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--stone-line);
}

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

.blueprint-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  background-color: var(--bg-surface-warm);
  border: 1px solid var(--stone-line);
  color: var(--text-secondary);
}

.blueprint-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.blueprint-status-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-terracotta);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-terracotta);
  border-radius: 50%;
  position: relative;
}

.pulse-dot::after {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--accent-terracotta);
  opacity: 0.6;
  animation: pulseRing 2.4s infinite ease-out;
}

@keyframes pulseRing {
  0% { transform: scale(0.6); opacity: 0.9; }
  100% { transform: scale(2.2); opacity: 0; }
}

.schematic-svg-wrap {
  width: 100%;
  height: auto;
  position: relative;
  background-color: #FAF7F2;
  border: 1px solid var(--stone-line);
  padding: 12px;
}

.schematic-svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Animated Route Dots */
.route-dot {
  fill: var(--accent-terracotta);
}

.dot-hk {
  animation: moveDotHk 4s infinite linear;
}

.dot-jp {
  animation: moveDotJp 5s infinite linear;
}

.dot-sg {
  animation: moveDotSg 4.5s infinite linear;
}

.dot-us {
  animation: moveDotUs 6s infinite linear;
}

@keyframes moveDotHk {
  0% { cx: 80; cy: 150; opacity: 0.2; }
  50% { opacity: 1; }
  100% { cx: 220; cy: 90; opacity: 0.2; }
}

@keyframes moveDotJp {
  0% { cx: 80; cy: 150; opacity: 0.2; }
  50% { opacity: 1; }
  100% { cx: 340; cy: 70; opacity: 0.2; }
}

@keyframes moveDotSg {
  0% { cx: 80; cy: 150; opacity: 0.2; }
  50% { opacity: 1; }
  100% { cx: 200; cy: 220; opacity: 0.2; }
}

@keyframes moveDotUs {
  0% { cx: 80; cy: 150; opacity: 0.2; }
  50% { opacity: 1; }
  100% { cx: 420; cy: 140; opacity: 0.2; }
}

.blueprint-legend {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--stone-line);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
}

.legend-swatch {
  width: 10px;
  height: 10px;
  background-color: var(--accent-terracotta);
  border: 1px solid var(--text-primary);
}

.legend-swatch.stone {
  background-color: var(--stone-dark);
}

.legend-swatch.outline {
  background-color: transparent;
  border: 1px dashed var(--text-primary);
}

.blueprint-disclaimer {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-top: 12px;
  line-height: 1.4;
}

/* ==========================================================================
   Horizontal "Regions" Band (Nodes Topology)
   ========================================================================== */
.regions-band-section {
  background-color: var(--bg-surface-warm);
  border-top: var(--border-architectural);
  border-bottom: var(--border-architectural);
  padding: 48px 0;
}

.regions-bar-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 24px;
}

.regions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.region-tile {
  background-color: var(--bg-surface);
  border: 1px solid var(--stone-line);
  padding: 20px;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.region-tile:hover {
  border-color: var(--accent-terracotta);
  transform: translateY(-2px);
}

.region-coord {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-terracotta);
  display: block;
  margin-bottom: 6px;
}

.region-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.region-protocols {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.protocol-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  background-color: var(--bg-primary);
  border: 1px solid var(--stone-line);
  color: var(--text-secondary);
}

.region-detail-list {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.region-detail-list li {
  position: relative;
  padding-left: 14px;
}

.region-detail-list li::before {
  content: "·";
  position: absolute;
  left: 2px;
  font-weight: 700;
  color: var(--accent-terracotta);
}

.regions-disclaimer {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 20px;
  text-align: right;
  font-family: var(--font-mono);
}

/* ==========================================================================
   Three Advantages Section (Architectural Grid)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--stone-line);
  padding: 36px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
}

.advantage-index {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--stone-dark);
  margin-bottom: 16px;
  line-height: 1;
}

.advantage-title {
  font-size: 22px;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.advantage-body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.advantage-spec {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px dashed var(--stone-line);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-terracotta);
}

/* ==========================================================================
   Editorial Layout A: AI Productivity Scenario (Architectural Ledger)
   ========================================================================== */
.scenario-ai-wrap {
  background-color: var(--bg-surface);
  border: 1px solid var(--text-primary);
  box-shadow: 12px 12px 0px var(--stone-pale);
  padding: 40px;
  margin-bottom: 64px;
}

.ai-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 2px solid var(--text-primary);
  padding-bottom: 16px;
  margin-bottom: 32px;
}

.ai-layout-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.ai-spec-column {
  border-right: 1px solid var(--stone-line);
  padding-right: 40px;
}

.ai-tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.ai-tool-badge {
  border: 1px solid var(--stone-line);
  background-color: var(--bg-primary);
  padding: 14px;
  position: relative;
}

.ai-tool-badge .tool-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--text-primary);
  display: block;
}

.ai-tool-badge .tool-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  line-height: 1.4;
}

.ai-rules-column {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ai-rule-item {
  margin-bottom: 20px;
}

.ai-rule-item h4 {
  font-size: 16px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-rule-item h4::before {
  content: "■";
  font-size: 10px;
  color: var(--accent-terracotta);
}

.ai-rule-item p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* ==========================================================================
   Editorial Layout B: Global Streaming Scenario (Media Gallery Matrix)
   ========================================================================== */
.scenario-streaming-wrap {
  position: relative;
}

.streaming-matrix-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.streaming-tile {
  background-color: var(--bg-surface-warm);
  border: 1px solid var(--stone-line);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}

.streaming-tile:hover {
  background-color: var(--bg-surface);
  border-color: var(--accent-terracotta);
  transform: translateY(-3px);
}

.streaming-icon-box {
  width: 44px;
  height: 44px;
  background-color: var(--bg-surface);
  border: 1px solid var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  color: var(--accent-terracotta);
  margin-bottom: 16px;
}

.streaming-platform-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.streaming-req {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
}

.streaming-pill {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 8px;
  background-color: #FFFFFF;
  border: 1px solid var(--stone-line);
  color: var(--text-muted);
  text-align: center;
}

/* ==========================================================================
   Pricing Section (Architectural Portfolio Tiers)
   ========================================================================== */
.pricing-section {
  background-color: var(--bg-surface-warm);
  border-top: var(--border-architectural);
  border-bottom: var(--border-architectural);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--stone-line);
  padding: 36px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border: 2px solid var(--accent-terracotta);
  box-shadow: 8px 8px 0px var(--accent-light);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background-color: var(--accent-terracotta);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  letter-spacing: 0.05em;
}

.pricing-header {
  border-bottom: 1px solid var(--stone-line);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.pricing-tier-name {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pricing-tagline {
  font-size: 13px;
  color: var(--text-muted);
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-top: 16px;
}

.pricing-price {
  font-family: var(--font-serif);
  font-size: 42px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

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

.pricing-placeholder-notice {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-terracotta);
  background-color: var(--bg-primary);
  padding: 2px 6px;
  border: 1px dashed var(--accent-terracotta);
  margin-top: 10px;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 4px;
  color: var(--accent-terracotta);
}

.pricing-footer-disclaimer {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  max-width: 800px;
  margin: 36px auto 0;
  line-height: 1.6;
}

/* ==========================================================================
   Nine SEO Article Cards Section (Directly Beneath Pricing)
   3 cols desktop / 2 cols tablet / 1 col mobile
   ========================================================================== */
.articles-section {
  padding-top: var(--section-pad);
  padding-bottom: var(--section-pad);
}

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

.article-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--stone-line);
  padding: 28px 24px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
  border-color: var(--accent-terracotta);
  transform: translateY(-4px);
  box-shadow: 6px 6px 0px var(--stone-pale);
}

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

.article-card-cat {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-terracotta);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.article-card-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.article-card-title {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 12px;
}

.article-card-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-link {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-terracotta);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
}

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

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

.testimonial-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--stone-line);
  padding: 30px;
  position: relative;
  display: flex;
  flex-direction: column;
}

.testimonial-type-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-terracotta);
  display: inline-block;
  margin-bottom: 14px;
  background-color: var(--bg-surface-warm);
  padding: 2px 8px;
  border: 1px solid var(--stone-line);
  align-self: flex-start;
}

.testimonial-quote {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
  font-style: normal;
}

.testimonial-author {
  border-top: 1px dashed var(--stone-line);
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.author-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}

.author-role {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ==========================================================================
   Accordion FAQ Section
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--stone-line);
  background-color: var(--bg-surface);
  margin-bottom: 12px;
  border: 1px solid var(--stone-line);
}

.faq-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 24px;
  text-align: left;
  background-color: transparent;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.faq-trigger:hover {
  background-color: var(--bg-surface-warm);
  color: var(--accent-terracotta);
}

.faq-trigger[aria-expanded="true"] {
  color: var(--accent-terracotta);
  background-color: var(--bg-surface-warm);
}

.faq-icon {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 400;
  color: var(--accent-terracotta);
  transition: transform 0.25s ease;
  line-height: 1;
}

.faq-trigger[aria-expanded="true"] .faq-icon {
  transform: rotate(45deg);
}

.faq-content {
  padding: 0 24px 24px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  display: none;
}

.faq-content.open {
  display: block;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--bg-surface-dim);
  border-top: 2px solid var(--text-primary);
  padding: 64px 0 32px;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand h4 {
  font-family: var(--font-serif);
  font-size: 20px;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 320px;
  margin-bottom: 16px;
}

.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-terracotta);
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.footer-col a:hover {
  color: var(--accent-terracotta);
}

.footer-bottom {
  border-top: 1px solid var(--stone-line);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.footer-disclaimer-block {
  margin-bottom: 24px;
  padding: 16px;
  background-color: var(--bg-surface-warm);
  border: 1px solid var(--stone-line);
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   Article & Content Pages (Single Article Layouts)
   ========================================================================== */
.breadcrumb-nav {
  padding: 20px 0;
  border-bottom: 1px solid var(--stone-line);
  margin-bottom: 40px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.breadcrumb-nav ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-nav li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--stone-dark);
}

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

.breadcrumb-nav a:hover {
  color: var(--accent-terracotta);
}

.article-header {
  margin-bottom: 48px;
}

.article-header h1 {
  margin-bottom: 20px;
}

.article-header-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--stone-line);
}

.article-body-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}

.article-body-layout.layout-wide {
  grid-template-columns: 1fr;
  max-width: 860px;
  margin: 0 auto;
}

.article-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content h2 {
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--stone-line);
}

.article-content h3 {
  margin-top: 32px;
  margin-bottom: 16px;
}

.article-content p {
  margin-bottom: 24px;
}

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

.article-content ul {
  list-style: disc;
}

.article-content ol {
  list-style: decimal;
}

.article-content li {
  margin-bottom: 10px;
  color: var(--text-secondary);
}

.article-callout {
  background-color: var(--bg-surface-warm);
  border-left: 4px solid var(--accent-terracotta);
  padding: 20px 24px;
  margin: 32px 0;
  font-size: 15px;
}

.article-callout strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.article-table-wrap {
  overflow-x: auto;
  margin: 32px 0;
  border: 1px solid var(--stone-line);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  text-align: left;
}

.article-table th {
  background-color: var(--bg-surface-warm);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--stone-line);
}

.article-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--stone-line);
  color: var(--text-secondary);
}

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

.article-sidebar {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--stone-line);
  padding: 24px;
}

.sidebar-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--stone-line);
}

.related-posts-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-post-item a {
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-secondary);
  display: block;
}

.related-post-item a:hover {
  color: var(--accent-terracotta);
}

/* ==========================================================================
   Reduced Motion Preferences
   ========================================================================== */
@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;
  }
  .pulse-dot::after {
    display: none !important;
  }
  .route-dot {
    animation: none !important;
  }
}

/* ==========================================================================
   Responsive Breakpoints: 1440px, 1024px, 768px, 430px, 390px, 375px
   ========================================================================== */
@media (max-width: 1024px) {
  :root {
    --h1-desktop: 44px;
    --section-pad: 64px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

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

  .streaming-matrix-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .article-body-layout {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
    margin-top: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --h1-desktop: 36px;
    --section-pad: 52px;
    --body-size: 16px;
  }

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

  h2 {
    font-size: 26px;
  }

  h3 {
    font-size: 20px;
  }

  .nav-desktop, .header-actions .btn-sm {
    display: none;
  }

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

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

  .ai-layout-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .ai-spec-column {
    border-right: none;
    padding-right: 0;
    border-bottom: 1px solid var(--stone-line);
    padding-bottom: 32px;
  }

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

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

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

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

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

@media (max-width: 430px) {
  .container, .container-narrow {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-tagline {
    font-size: 10px;
  }

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

  .streaming-matrix-grid {
    grid-template-columns: 1fr;
  }

  .ai-tool-grid {
    grid-template-columns: 1fr;
  }

  .scenario-ai-wrap {
    padding: 24px 16px;
  }

  .btn {
    width: 100%;
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}