/* ==========================================================================
   澶ц大象网络缃戠粶 - Global Network Acceleration & Transit Platform
   Design System: Soft Sage, Warm Cream, Dark Olive & Clean White Canvas
   Humanist Sans-Serif Typography | Restrained Rounded Corners | Softly Outlined
   ========================================================================== */

:root {
  /* Palette: Soft Sage, Warm Cream, Dark Olive, Clean White */
  --canvas-white: #FFFFFF;
  --bg-cream: #FAF8F5;
  --bg-cream-soft: #F5F1EB;
  --bg-cream-warm: #EFE9DE;
  --bg-sage-wash: #F2F6F3;
  --bg-sage-tint: #E5EFE7;
  --bg-sage-accent: #D7E5DB;
  
  --sage-primary: #5E7E67;
  --sage-dark: #4A6753;
  --sage-light: #7E9E87;
  --sage-pale: #9EB6A5;

  --olive-dark: #223225;
  --olive-deep: #17241A;
  --olive-slate: #3B4D3F;
  --olive-muted: #566859;
  --olive-subtle: #798B7C;
  --olive-border: rgba(94, 126, 103, 0.22);
  
  --border-soft: #E0E8E2;
  --border-cream: #EBE5DB;
  --border-focused: #5E7E67;

  /* Typography: Friendly Humanist Sans-Serif */
  --font-humanist: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  /* Restrained, Gentle Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;

  /* Shadows */
  --shadow-subtle: 0 2px 10px rgba(34, 50, 37, 0.035);
  --shadow-card: 0 4px 20px -2px rgba(34, 50, 37, 0.05);
  --shadow-hover: 0 8px 30px -4px rgba(34, 50, 37, 0.09);
  --shadow-featured: 0 10px 32px -4px rgba(94, 126, 103, 0.16);

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);

  /* Compatibility Aliases for Article Layouts */
  --accent-burgundy: var(--sage-dark);
  --accent-primary: var(--sage-primary);
  --bg-card: var(--bg-cream);
  --bg-surface: var(--canvas-white);
  --text-primary: var(--olive-dark);
  --text-secondary: var(--olive-slate);
  --text-muted: var(--olive-subtle);
  --font-serif: var(--font-humanist);
}

/* Base Reset & Smooth Scroll */
*, *::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-humanist);
  background-color: var(--canvas-white);
  color: var(--olive-muted);
  line-height: 1.75;
  letter-spacing: 0.005em;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .fade-in-on-scroll {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--olive-dark);
  font-weight: 600;
  line-height: 1.32;
  letter-spacing: -0.018em;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--sage-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Layout Containers */
.site-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.site-container-narrow {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Top Announcement / Edition Bar */
.top-edition-bar {
  background-color: var(--bg-cream);
  border-bottom: 1px solid var(--border-cream);
  font-size: 0.825rem;
  color: var(--olive-subtle);
  padding: 0.45rem 0;
}

.edition-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.edition-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--bg-sage-wash);
  color: var(--sage-dark);
  border: 1px solid var(--border-soft);
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.edition-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--sage-primary);
  display: inline-block;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
  transition: all var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--bg-sage-wash), var(--bg-sage-tint));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sage-dark);
  font-weight: 700;
  font-size: 1rem;
}

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

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--olive-dark);
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.brand-tagline {
  font-size: 0.72rem;
  color: var(--olive-subtle);
  letter-spacing: 0.03em;
  font-weight: 500;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--olive-slate);
  padding: 0.4rem 0.2rem;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--olive-dark);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--sage-primary);
  border-radius: 2px;
  transition: width var(--transition-smooth);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Standard Buttons - Ensured Non-Empty */
.btn-solid-olive {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  background-color: var(--olive-dark);
  color: #FFFFFF !important;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--olive-dark);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.btn-solid-olive:hover {
  background-color: var(--olive-deep);
  border-color: var(--olive-deep);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(34, 50, 37, 0.15);
}

.btn-soft-sage {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  background-color: var(--bg-sage-wash);
  color: var(--sage-dark) !important;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.btn-soft-sage:hover {
  background-color: var(--bg-sage-tint);
  border-color: var(--sage-primary);
  color: var(--olive-dark) !important;
  transform: translateY(-1px);
}

.btn-outline-cream {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  background-color: var(--canvas-white);
  color: var(--olive-slate) !important;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.btn-outline-cream:hover {
  background-color: var(--bg-cream);
  border-color: var(--border-cream);
  color: var(--olive-dark) !important;
}

/* Mobile Toggle */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--olive-dark);
}

.nav-toggle-icon {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--olive-dark);
  position: relative;
  transition: background-color var(--transition-fast);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 2px;
  background-color: var(--olive-dark);
  left: 0;
  transition: transform var(--transition-smooth);
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  bottom: -6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 4.25rem;
  left: 0;
  width: 100%;
  height: calc(100vh - 4.25rem);
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(16px);
  padding: 1.5rem;
  flex-direction: column;
  gap: 1rem;
  z-index: 999;
  border-bottom: 1px solid var(--border-soft);
  overflow-y: auto;
}

.mobile-nav-drawer.is-open {
  display: flex;
}

.mobile-nav-link {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--olive-slate);
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-cream);
}

.mobile-nav-link:hover {
  color: var(--olive-dark);
}

/* ==========================================================================
   Hero Section (Text-Led + CSS Product Illustration)
   ========================================================================== */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  background: radial-gradient(circle at 85% 20%, var(--bg-sage-wash) 0%, var(--canvas-white) 65%);
  border-bottom: 1px solid var(--border-soft);
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3.5rem;
}

.hero-text-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.hero-kicker-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: flex-start;
  background-color: var(--bg-sage-wash);
  color: var(--sage-dark);
  border: 1px solid var(--border-soft);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.hero-kicker-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--sage-primary);
  box-shadow: 0 0 0 3px rgba(94, 126, 103, 0.2);
}

.hero-title {
  font-size: 2.75rem;
  line-height: 1.25;
  color: var(--olive-dark);
  font-weight: 700;
  letter-spacing: -0.025em;
}

.hero-title em {
  font-style: normal;
  color: var(--sage-primary);
  background: linear-gradient(135deg, var(--sage-dark), var(--sage-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-narrative {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--olive-slate);
  margin-bottom: 0.5rem;
}

.hero-actions-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

.hero-trust-metrics {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-soft);
  margin-top: 0.75rem;
}

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

.metric-number {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--olive-dark);
  line-height: 1.1;
}

.metric-desc {
  font-size: 0.8rem;
  color: var(--olive-subtle);
  margin-top: 0.2rem;
}

/* CSS Product Illustration: "澶ц大象网络缃戠粶 Core Pebble Gateway" */
.hero-illustration-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.css-product-device {
  width: 100%;
  max-width: 420px;
  background-color: var(--canvas-white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  position: relative;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.css-product-device:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.device-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-cream);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}

.device-brand-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.device-icon-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--sage-primary);
  position: relative;
}

.device-icon-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1px solid var(--sage-light);
  animation: pulse-ring 2.5s infinite ease-out;
}

@keyframes pulse-ring {
  0% { transform: scale(0.9); opacity: 0.8; }
  100% { transform: scale(1.6); opacity: 0; }
}

.device-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--olive-dark);
}

.device-status-badge {
  font-size: 0.725rem;
  background-color: var(--bg-sage-wash);
  color: var(--sage-dark);
  border: 1px solid var(--border-soft);
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* Interactive Node Pulse Grid in Device */
.device-node-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.device-node-item {
  background-color: var(--bg-cream);
  border: 1px solid var(--border-cream);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

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

.node-flag-tag {
  font-size: 0.72rem;
  font-weight: 700;
  background-color: var(--bg-sage-wash);
  color: var(--sage-dark);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.node-latency-pill {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--sage-dark);
}

.node-city-title {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--olive-dark);
  margin-top: 0.2rem;
}

.node-subtext {
  font-size: 0.72rem;
  color: var(--olive-subtle);
}

/* Device Mini Signal Wave */
.device-signal-bar {
  background: linear-gradient(90deg, var(--bg-sage-wash), var(--bg-cream));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--olive-muted);
}

.signal-wave-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 16px;
}

.wave-bar {
  width: 3px;
  background-color: var(--sage-primary);
  border-radius: 1px;
}

.wave-bar:nth-child(1) { height: 6px; }
.wave-bar:nth-child(2) { height: 12px; }
.wave-bar:nth-child(3) { height: 9px; }
.wave-bar:nth-child(4) { height: 15px; }
.wave-bar:nth-child(5) { height: 10px; }

/* ==========================================================================
   Section Headers (Spacious Humanist Styling)
   ========================================================================== */
.section-wrapper {
  padding: 5rem 0;
  position: relative;
}

.section-wrapper-cream {
  background-color: var(--bg-cream);
  border-top: 1px solid var(--border-cream);
  border-bottom: 1px solid var(--border-cream);
}

.section-header-block {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem;
}

.section-kicker {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--sage-dark);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.section-main-title {
  font-size: 2.15rem;
  font-weight: 700;
  color: var(--olive-dark);
  letter-spacing: -0.02em;
  margin-bottom: 0.85rem;
}

.section-lead-text {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--olive-slate);
}

/* ==========================================================================
   Alternating Layout: Image-Style Feature Panels & Text
   ========================================================================== */
.alternating-features-list {
  display: flex;
  flex-direction: column;
  gap: 4.5rem;
}

.feature-alternating-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
}

/* Reverse layout for even rows */
.feature-alternating-row:nth-child(even) {
  direction: rtl;
}

.feature-alternating-row:nth-child(even) > * {
  direction: ltr;
}

.feature-text-block {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.feature-badge-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  align-self: flex-start;
  font-size: 0.775rem;
  font-weight: 700;
  color: var(--sage-dark);
  background-color: var(--bg-sage-wash);
  border: 1px solid var(--border-soft);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.03em;
}

.feature-heading {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--olive-dark);
  letter-spacing: -0.015em;
  line-height: 1.35;
}

.feature-paragraph {
  font-size: 1.025rem;
  line-height: 1.8;
  color: var(--olive-muted);
}

.feature-specs-checklist {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  font-size: 0.95rem;
  color: var(--olive-slate);
  line-height: 1.6;
}

.checklist-icon {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--bg-sage-wash);
  color: var(--sage-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 3px;
  border: 1px solid var(--border-soft);
}

/* Image-Style Visual Panels (Rendered as Softly Outlined Mockup Frames) */
.feature-visual-panel {
  background-color: var(--canvas-white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-visual-panel:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.visual-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-cream);
  padding-bottom: 0.85rem;
  margin-bottom: 1.25rem;
}

.visual-panel-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--olive-subtle);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.visual-panel-action {
  font-size: 0.72rem;
  font-weight: 600;
  background-color: var(--bg-sage-wash);
  color: var(--sage-dark);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
}

/* Panel 1: BGP Routing Simulation */
.routing-diagram {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.carrier-entry-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.carrier-box {
  background-color: var(--bg-cream);
  border: 1px solid var(--border-cream);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.5rem;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--olive-dark);
}

.carrier-box span {
  display: block;
  font-size: 0.7rem;
  color: var(--sage-primary);
  margin-top: 0.2rem;
}

.routing-tunnel-arrow {
  text-align: center;
  padding: 0.4rem 0;
  color: var(--sage-primary);
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.routing-tunnel-line {
  flex-grow: 1;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--sage-primary) 0, var(--sage-primary) 4px, transparent 4px, transparent 8px);
}

.tunnel-destination-box {
  background-color: var(--bg-sage-wash);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.tunnel-destination-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--olive-dark);
  margin-bottom: 0.5rem;
}

.tunnel-stats-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--olive-muted);
}

/* Panel 2: Clean IP Telemetry Card */
.clean-ip-checklist {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.ip-probe-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  background-color: var(--bg-cream);
  border: 1px solid var(--border-cream);
  border-radius: var(--radius-md);
  font-size: 0.825rem;
}

.ip-probe-service {
  font-weight: 600;
  color: var(--olive-dark);
}

.ip-probe-status {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--sage-dark);
  font-size: 0.75rem;
  font-weight: 600;
}

/* Panel 3: Global Node Matrix */
.matrix-regions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.matrix-region-card {
  background-color: var(--bg-cream);
  border: 1px solid var(--border-cream);
  border-radius: var(--radius-md);
  padding: 0.85rem;
}

.region-title-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.4rem;
}

.region-city {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--olive-dark);
}

.region-ping {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--sage-dark);
}

.region-tier-info {
  font-size: 0.72rem;
  color: var(--olive-subtle);
}

/* Panel 4: AI & 4K Streaming Split Engine */
.dual-engine-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.engine-column {
  background-color: var(--bg-cream);
  border: 1px solid var(--border-cream);
  border-radius: var(--radius-md);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.engine-header {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--olive-dark);
  border-bottom: 1px solid var(--border-cream);
  padding-bottom: 0.4rem;
}

.engine-app-tag {
  font-size: 0.75rem;
  background-color: var(--canvas-white);
  border: 1px solid var(--border-cream);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  color: var(--olive-slate);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ==========================================================================
   Pricing Section (Horizontal Plan Rows with One Highlighted Option)
   ========================================================================== */
.pricing-section-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pricing-plan-row {
  background-color: var(--canvas-white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  display: grid;
  grid-template-columns: 240px 1fr 200px;
  align-items: center;
  gap: 2rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
  position: relative;
}

.pricing-plan-row:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: var(--sage-light);
}

/* Highlighted Plan Row: 进阶专业方案 (Pro Core) */
.pricing-plan-row.is-featured {
  background-color: var(--bg-sage-wash);
  border: 2px solid var(--sage-primary);
  box-shadow: var(--shadow-featured);
}

.pricing-plan-row.is-featured::before {
  content: '★ 推荐方案 · 热门选择 / 编辑力荐';
  position: absolute;
  top: -12px;
  left: 2rem;
  background-color: var(--sage-primary);
  color: #FFFFFF;
  font-size: 0.725rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-sm);
}

.plan-info-col {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.plan-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--sage-dark);
  text-transform: uppercase;
  margin-bottom: 0.15rem;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--olive-dark);
  line-height: 1.2;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--olive-subtle);
  line-height: 1.5;
}

.plan-specs-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem 1.5rem;
  border-left: 1px solid var(--border-soft);
  border-right: 1px solid var(--border-soft);
  padding: 0 1.75rem;
}

.plan-spec-item {
  display: flex;
  flex-direction: column;
}

.spec-title {
  font-size: 0.725rem;
  color: var(--olive-subtle);
  font-weight: 500;
}

.spec-value {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--olive-dark);
  margin-top: 0.1rem;
}

.plan-price-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.75rem;
}

.price-display-wrap {
  text-align: right;
}

.price-currency {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--olive-dark);
}

.price-amount {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--olive-dark);
  line-height: 1;
}

.price-period {
  font-size: 0.85rem;
  color: var(--olive-subtle);
}

.plan-cta-button {
  width: 100%;
  text-align: center;
}

/* ==========================================================================
   SEO Articles Section (3x3 Humanist Cards)
   ========================================================================== */
.articles-catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card-box {
  background-color: var(--canvas-white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

.article-card-box:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--sage-light);
}

.article-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
}

.article-category-badge {
  font-size: 0.725rem;
  font-weight: 600;
  color: var(--sage-dark);
  background-color: var(--bg-sage-wash);
  border: 1px solid var(--border-soft);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
}

.article-read-time {
  font-size: 0.75rem;
  color: var(--olive-subtle);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--olive-dark);
  line-height: 1.45;
  margin-bottom: 0.75rem;
}

.article-card-title a {
  color: var(--olive-dark);
}

.article-card-title a:hover {
  color: var(--sage-primary);
}

.article-summary-text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--olive-muted);
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-cream);
  padding-top: 1rem;
  font-size: 0.8rem;
}

.article-date-stamp {
  color: var(--olive-subtle);
}

.article-action-link {
  font-weight: 600;
  color: var(--sage-dark);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: transform var(--transition-fast);
}

.article-action-link:hover {
  color: var(--olive-dark);
  transform: translateX(2px);
}

/* ==========================================================================
   User Testimonials Section
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.testimonial-card-box {
  background-color: var(--bg-cream);
  border: 1px solid var(--border-cream);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-quote {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--olive-slate);
  margin-bottom: 1.25rem;
  font-style: normal;
}

.testimonial-author-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px solid var(--border-cream);
  padding-top: 1rem;
}

.author-avatar-badge {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--bg-sage-wash);
  color: var(--sage-dark);
  border: 1px solid var(--border-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.825rem;
}

.author-meta-info {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--olive-dark);
}

.author-role {
  font-size: 0.75rem;
  color: var(--olive-subtle);
}

/* ==========================================================================
   FAQ Section (Accordion with Soft Cream Backgrounds)
   ========================================================================== */
.faq-accordion-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  max-width: 860px;
  margin: 0 auto;
}

.faq-item-box {
  background-color: var(--canvas-white);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item-box:hover {
  border-color: var(--sage-light);
}

.faq-item-box[open] {
  border-color: var(--sage-primary);
  box-shadow: var(--shadow-subtle);
}

.faq-summary-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.15rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--olive-dark);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

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

.faq-icon-chevron {
  width: 18px;
  height: 18px;
  color: var(--sage-primary);
  transition: transform var(--transition-fast);
}

.faq-item-box[open] .faq-icon-chevron {
  transform: rotate(180deg);
}

.faq-content-drawer {
  padding: 0 1.5rem 1.25rem 1.5rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--olive-muted);
  border-top: 1px solid var(--bg-sage-wash);
  padding-top: 0.85rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--bg-cream);
  border-top: 1px solid var(--border-cream);
  padding: 4.5rem 0 2.5rem;
  font-size: 0.875rem;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.footer-brand-desc {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--olive-subtle);
  max-width: 320px;
}

.footer-nav-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--olive-dark);
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.footer-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-nav-links a {
  color: var(--olive-slate);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

/* Curated External SEO Links (No nofollow as requested) */
.footer-curated-bar {
  border-top: 1px solid var(--border-cream);
  border-bottom: 1px solid var(--border-cream);
  padding: 1.25rem 0;
  margin-bottom: 1.75rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.825rem;
  color: var(--olive-subtle);
}

.curated-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.curated-item {
  color: var(--sage-dark);
  font-weight: 500;
}

.curated-item:hover {
  color: var(--olive-dark);
  text-decoration: underline;
}

.footer-bottom-baseline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--olive-subtle);
}

/* ==========================================================================
   Gentle Scroll Transition Utilities
   ========================================================================== */
.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.fade-in-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   Article Pages Specific Styles (Markdown / Prose reader)
   ========================================================================== */
.article-reading-container {
  padding: 3.5rem 0 5rem;
}

.article-header-meta {
  margin-bottom: 2.25rem;
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 1.75rem;
}

.breadcrumb-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--olive-subtle);
  margin-bottom: 1rem;
}

.article-hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--olive-dark);
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.article-author-date-line {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.85rem;
  color: var(--olive-subtle);
}

.article-prose {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--olive-slate);
}

.article-prose h2 {
  font-size: 1.6rem;
  margin: 2.5rem 0 1rem;
  color: var(--olive-dark);
}

.article-prose h3 {
  font-size: 1.25rem;
  margin: 1.75rem 0 0.75rem;
  color: var(--olive-dark);
}

.article-prose p {
  margin-bottom: 1.25rem;
}

.article-prose ul, .article-prose ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.article-prose li {
  margin-bottom: 0.5rem;
}

.article-prose blockquote {
  border-left: 3px solid var(--sage-primary);
  background-color: var(--bg-sage-wash);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  font-style: normal;
  color: var(--olive-slate);
}

.article-prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background-color: var(--bg-cream);
  border: 1px solid var(--border-cream);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  color: var(--olive-dark);
}

.article-prose pre {
  background-color: var(--olive-dark);
  color: #EDF2EE;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.article-prose pre code {
  background: transparent;
  border: none;
  color: inherit;
  padding: 0;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .css-product-device {
    max-width: 100%;
  }

  .feature-alternating-row {
    gap: 2.5rem;
  }

  .pricing-plan-row {
    grid-template-columns: 200px 1fr 180px;
    gap: 1.5rem;
    padding: 1.5rem;
  }

  .plan-specs-col {
    grid-template-columns: repeat(2, 1fr);
    padding: 0 1.25rem;
  }

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

  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .main-nav, .header-actions .btn-outline-cream {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .hero-title {
    font-size: 2.15rem;
  }

  .section-main-title {
    font-size: 1.75rem;
  }

  .feature-alternating-row,
  .feature-alternating-row:nth-child(even) {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: 2rem;
  }

  .pricing-plan-row {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    padding: 1.5rem 1.25rem;
  }

  .pricing-plan-row.is-featured::before {
    left: 1.25rem;
  }

  .plan-specs-col {
    border-left: none;
    border-right: none;
    border-top: 1px solid var(--border-soft);
    border-bottom: 1px solid var(--border-soft);
    padding: 1rem 0;
    grid-template-columns: 1fr 1fr;
  }

  .plan-price-col {
    align-items: stretch;
  }

  .price-display-wrap {
    text-align: left;
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
  }

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

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

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

/* ==========================================================================
   Article Pages Specific Layout & Compatibility Classes
   ========================================================================== */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  background-color: var(--olive-dark);
  color: #FFFFFF !important;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--olive-dark);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  text-align: center;
}

.btn-cta:hover {
  background-color: var(--olive-deep);
  border-color: var(--olive-deep);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(34, 50, 37, 0.15);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  background-color: var(--canvas-white);
  color: var(--olive-slate) !important;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  text-align: center;
}

.btn-ghost:hover {
  background-color: var(--bg-cream);
  border-color: var(--border-cream);
  color: var(--olive-dark) !important;
}

.article-header-hero {
  padding: 2.5rem 0 1.75rem;
  border-bottom: 1px solid var(--border-soft);
  margin-bottom: 2.5rem;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--olive-subtle);
  margin-bottom: 1rem;
}

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

.article-meta-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--olive-subtle);
  margin-top: 1rem;
}

.article-body-layout {
  display: grid;
  grid-template-columns: 1fr 310px;
  gap: 3.5rem;
  align-items: start;
  margin-bottom: 5rem;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--olive-slate);
}

.article-content h2 {
  font-size: 1.6rem;
  margin: 2.25rem 0 1rem;
  color: var(--olive-dark);
}

.article-content h3 {
  font-size: 1.25rem;
  margin: 1.75rem 0 0.75rem;
  color: var(--olive-dark);
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul, .article-content ol {
  margin: 1rem 0 1.5rem 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.article-content th, .article-content td {
  border: 1px solid var(--border-soft);
  padding: 0.75rem 1rem;
  text-align: left;
}

.article-content th {
  background-color: var(--bg-cream);
  color: var(--olive-dark);
  font-weight: 600;
}

.article-content blockquote {
  border-left: 3px solid var(--sage-primary);
  background-color: var(--bg-sage-wash);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  color: var(--olive-slate);
}

.article-sidebar {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-widget {
  background-color: var(--bg-cream);
  border: 1px solid var(--border-cream);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.widget-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--olive-dark);
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-cream);
  padding-bottom: 0.5rem;
}

.widget-article-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.widget-article-item a {
  font-size: 0.875rem;
  color: var(--olive-dark);
  font-weight: 600;
  display: block;
  line-height: 1.4;
}

.widget-article-item a:hover {
  color: var(--sage-primary);
}

.widget-article-meta {
  font-size: 0.75rem;
  color: var(--olive-subtle);
  margin-top: 0.2rem;
}

.footer-bottom-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--olive-subtle);
}

.footer-curated-links-bar {
  border-top: 1px solid var(--border-cream);
  padding-top: 1.25rem;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.825rem;
}

.curated-links-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.curated-link-item {
  color: var(--sage-dark);
  font-weight: 500;
}

.curated-link-item:hover {
  color: var(--olive-dark);
  text-decoration: underline;
}

@media (max-width: 1024px) {
  .article-body-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}