/* ==========================================================================
   白月光 BYG Cloud - Cloud Nine 云端视觉规范 & 极简文档样式库
   Palette:
     - Main Background: #F8FBFF
     - Brand Blue: #5278E8
     - Deep Space Blue: #142C52
     - Cloud Mist Blue: #E8F1FF
     - Body Text: #24354B
   ========================================================================== */

:root {
  --color-bg: #F8FBFF;
  --color-brand: #5278E8;
  --color-brand-hover: #3E62CD;
  --color-brand-light: #6E90F3;
  --color-brand-glow: rgba(82, 120, 232, 0.25);
  --color-deep: #142C52;
  --color-deep-surface: #1B355F;
  --color-cloud: #E8F1FF;
  --color-cloud-soft: #F0F6FF;
  --color-text: #24354B;
  --color-text-muted: #5B6F8A;
  --color-text-light: #879BBB;
  --color-border: #DCE8F7;
  --color-border-subtle: #E8F0FB;
  --color-white: #FFFFFF;
  --color-success: #10B981;
  --color-warning: #F59E0B;

  --shadow-sm: 0 1px 2px 0 rgba(20, 44, 82, 0.05);
  --shadow-md: 0 4px 12px -1px rgba(20, 44, 82, 0.08), 0 2px 6px -1px rgba(20, 44, 82, 0.04);
  --shadow-lg: 0 10px 25px -3px rgba(20, 44, 82, 0.1), 0 4px 12px -2px rgba(20, 44, 82, 0.05);
  --shadow-glow: 0 0 28px rgba(82, 120, 232, 0.28);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --container-max: 1200px;
  --header-height: 70px;
  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Reset & Box Sizing */
*, *::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(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  letter-spacing: -0.01em;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

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

.section {
  padding-top: 80px;
  padding-bottom: 80px;
  position: relative;
}

.section-alt {
  background-color: var(--color-cloud-soft);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

/* Header & Glassmorphic Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(248, 251, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(220, 232, 247, 0.8);
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(20, 44, 82, 0.06);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 16px;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-link img, .logo-link svg {
  height: 38px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: clamp(10px, 1.6vw, 24px);
  white-space: nowrap;
  flex-shrink: 1;
}

.nav-item {
  position: relative;
  flex-shrink: 0;
}

.nav-link {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.92rem;
  padding: 8px 4px;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

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

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-brand);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* Search Trigger Button */
.search-trigger-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-cloud);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 7px 14px;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.search-trigger-btn span {
  white-space: nowrap;
}

.search-trigger-btn:hover {
  background: var(--color-white);
  border-color: var(--color-brand);
  color: var(--color-brand);
  box-shadow: var(--shadow-sm);
}

.search-trigger-btn kbd {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-text-light);
  white-space: nowrap;
}

/* Mobile Toggle */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text);
}

.mobile-nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-brand);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(82, 120, 232, 0.35);
}

.btn-primary:hover {
  background-color: var(--color-brand-hover);
  color: var(--color-white);
  box-shadow: 0 6px 20px rgba(82, 120, 232, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--color-cloud);
  color: var(--color-deep);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background-color: var(--color-white);
  border-color: var(--color-brand);
  color: var(--color-brand);
  transform: translateY(-1px);
}

.btn-outline-white {
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(8px);
}

.btn-outline-white:hover {
  background: var(--color-white);
  color: var(--color-deep);
}

.btn-lg {
  padding: 14px 30px;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

/* Cloud Nine Hero Section */
.hero {
  position: relative;
  padding: 90px 0 100px;
  background: radial-gradient(circle at 80% 15%, rgba(123, 157, 255, 0.16), transparent 50%),
              radial-gradient(circle at 20% 85%, rgba(232, 241, 255, 0.8), transparent 60%),
              linear-gradient(180deg, #F8FBFF 0%, #EFF5FE 100%);
  overflow: hidden;
}

/* Cloud Animations in Hero */
.hero-clouds-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.cloud-layer {
  position: absolute;
  width: 200%;
  height: 100%;
  background-repeat: repeat-x;
  opacity: 0.55;
  transition: transform 0.1s ease-out;
}

.cloud-layer-1 {
  bottom: -20px;
  background: radial-gradient(ellipse 400px 120px at 20% 100%, rgba(255, 255, 255, 0.8), transparent 70%),
              radial-gradient(ellipse 500px 140px at 60% 100%, rgba(255, 255, 255, 0.9), transparent 70%),
              radial-gradient(ellipse 450px 130px at 90% 100%, rgba(255, 255, 255, 0.8), transparent 70%);
  animation: floatCloud1 45s linear infinite alternate;
}

.cloud-layer-2 {
  top: 10%;
  background: radial-gradient(ellipse 350px 90px at 30% 30%, rgba(232, 241, 255, 0.7), transparent 70%),
              radial-gradient(ellipse 420px 100px at 75% 25%, rgba(232, 241, 255, 0.55), transparent 70%);
  animation: floatCloud2 60s linear infinite alternate;
  opacity: 0.45;
}

@keyframes floatCloud1 {
  0% { transform: translateX(0); }
  100% { transform: translateX(-80px); }
}

@keyframes floatCloud2 {
  0% { transform: translateX(0); }
  100% { transform: translateX(60px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-brand);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-brand);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(82, 120, 232, 0.5);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { box-shadow: 0 0 0 0 rgba(82, 120, 232, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(82, 120, 232, 0); }
  100% { box-shadow: 0 0 0 0 rgba(82, 120, 232, 0); }
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 800;
  line-height: 1.22;
  color: var(--color-deep);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, var(--color-deep) 10%, var(--color-brand) 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.22rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 34px;
  max-width: 740px;
  margin-left: auto;
  margin-right: auto;
}

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

.hero-notice {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--color-text-light);
  background: rgba(255, 255, 255, 0.7);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  border: 1px dashed var(--color-border);
}

/* Feature Highlights Bar */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 50px;
  text-align: left;
}

.stat-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-brand);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 2px;
}

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

/* Typography & Section Headers */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-brand);
  background-color: var(--color-cloud);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-deep);
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.015em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

/* Documentation Content Flow (Minimal Document Framework) */
.doc-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

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

.doc-feature-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-fast);
  position: relative;
}

.doc-feature-item:hover {
  border-color: var(--color-brand-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--color-cloud);
  color: var(--color-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

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

.doc-feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 10px;
}

.doc-feature-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Network Tech Deep Dive (BGP vs IPLC vs SD-WAN) */
.tech-compare-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tech-compare-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.tech-badge {
  align-self: flex-start;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.badge-bgp { background: #E0F2FE; color: #0369A1; }
.badge-iplc { background: #DCFCE7; color: #15803D; }
.badge-sdwan { background: #FEF3C7; color: #B45309; }

.tech-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 10px;
}

.tech-card-desc {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  flex-grow: 1;
}

.tech-card-specs {
  list-style: none;
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tech-spec-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
}

.tech-spec-label {
  color: var(--color-text-light);
}

.tech-spec-val {
  font-weight: 600;
  color: var(--color-text);
}

/* Node Regions Grid */
.region-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.region-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: all var(--transition-fast);
}

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

.region-flag-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.region-flag {
  font-size: 1.8rem;
  line-height: 1;
}

.region-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-deep);
}

.region-code {
  font-size: 0.75rem;
  color: var(--color-text-light);
  font-family: var(--font-mono);
}

.region-details {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 12px;
}

.region-latency-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-brand);
  background: var(--color-cloud);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* Plan Table (Horizontal Comparison Table) */
.table-responsive-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 720px;
}

.pricing-table th,
.pricing-table td {
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-border-subtle);
  vertical-align: middle;
}

.pricing-table thead th {
  background: var(--color-cloud-soft);
  color: var(--color-deep);
  font-weight: 700;
  font-size: 0.95rem;
  border-bottom: 1px solid var(--color-border);
}

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

.pricing-table tbody tr:hover {
  background-color: #F8FAFD;
}

.pricing-table tr.highlight-row {
  background-color: rgba(82, 120, 232, 0.04);
}

.plan-name-col {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.plan-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-deep);
}

.plan-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--color-brand);
  color: var(--color-white);
}

.plan-price-num {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-brand);
}

.plan-price-period {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.pricing-table-disclaimer {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  background: var(--color-cloud);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-brand);
}

/* Device & Client Setup Guide Section */
.client-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-fast);
}

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

.client-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
  border-radius: var(--radius-md);
  background: var(--color-cloud);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-deep);
}

.client-icon svg {
  width: 28px;
  height: 28px;
}

.client-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 6px;
}

.client-rec {
  font-size: 0.85rem;
  color: var(--color-brand);
  font-weight: 600;
  margin-bottom: 12px;
}

.client-steps {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  text-align: left;
}

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

.article-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.article-cat-tag {
  background: var(--color-cloud);
  color: var(--color-brand);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-deep);
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-card:hover .article-card-title {
  color: var(--color-brand);
}

.article-card-summary {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-brand);
}

.article-read-more svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.article-card:hover .article-read-more svg {
  transform: translateX(4px);
}

/* Accordion FAQ Component */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:focus-within, .faq-item:hover {
  border-color: var(--color-brand-light);
}

.faq-question-btn {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  padding: 22px 24px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-deep);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-question-btn:hover {
  color: var(--color-brand);
}

.faq-icon {
  width: 22px;
  height: 22px;
  color: var(--color-brand);
  flex-shrink: 0;
  transition: transform var(--transition-normal);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  transition: max-height 0.3s ease-in-out;
}

.faq-answer-inner {
  padding: 0 24px 24px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 16px;
}

/* Call To Action Banner */
.cta-banner {
  background: linear-gradient(135deg, var(--color-deep) 0%, #1D3A6C 50%, var(--color-brand) 100%);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  color: var(--color-white);
  text-align: center;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 70% 30%, rgba(255, 255, 255, 0.15), transparent 60%);
  pointer-events: none;
}

.cta-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 14px;
}

.cta-desc {
  font-size: 1.1rem;
  color: #D6E4FF;
  max-width: 680px;
  margin: 0 auto 30px;
}

.cta-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Documentation Detail Layout (Article View) */
.doc-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 240px;
  gap: 40px;
  padding-top: 40px;
  padding-bottom: 80px;
}

.doc-layout-single-aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 40px;
  padding-top: 40px;
  padding-bottom: 80px;
}

/* Breadcrumb */
.breadcrumb-nav {
  margin-bottom: 24px;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  font-size: 0.88rem;
  color: var(--color-text-light);
}

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

.breadcrumb-item a:hover {
  color: var(--color-brand);
}

.breadcrumb-separator {
  color: var(--color-text-light);
}

.breadcrumb-item.active {
  color: var(--color-deep);
  font-weight: 600;
}

/* Article Typography & Elements */
.doc-article {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 44px;
  box-shadow: var(--shadow-sm);
}

.article-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 26px;
  margin-bottom: 32px;
}

.article-main-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--color-deep);
  line-height: 1.3;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-top: 40px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-subtle);
  position: relative;
}

.article-body h2::before {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 40px;
  height: 2px;
  background-color: var(--color-brand);
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-body p {
  margin-bottom: 20px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
  color: var(--color-text);
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.article-body strong {
  color: var(--color-deep);
  font-weight: 700;
}

.article-body blockquote {
  border-left: 4px solid var(--color-brand);
  background: var(--color-cloud-soft);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* Callout Boxes */
.callout {
  padding: 20px 22px;
  border-radius: var(--radius-md);
  margin: 24px 0;
  font-size: 0.95rem;
  line-height: 1.65;
  border-left: 4px solid transparent;
}

.callout-info {
  background-color: var(--color-cloud);
  border-left-color: var(--color-brand);
  color: var(--color-deep);
}

.callout-tip {
  background-color: #ECFDF5;
  border-left-color: var(--color-success);
  color: #065F46;
}

.callout-warning {
  background-color: #FFFBEB;
  border-left-color: var(--color-warning);
  color: #92400E;
}

/* Article Table Styling */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 26px 0;
  font-size: 0.92rem;
}

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

.article-body th {
  background-color: var(--color-cloud-soft);
  color: var(--color-deep);
  font-weight: 700;
}

/* Code Blocks */
pre code {
  display: block;
  background: var(--color-deep);
  color: #E2E8F0;
  padding: 18px 22px;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  overflow-x: auto;
  line-height: 1.6;
  margin: 20px 0;
}

code:not(pre code) {
  background: var(--color-cloud);
  color: var(--color-brand-hover);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.88em;
}

/* Sticky TOC Sidebar */
.sticky-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 30px);
  height: fit-content;
  max-height: calc(100vh - var(--header-height) - 60px);
  overflow-y: auto;
}

.toc-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 22px;
}

.toc-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-item a {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.4;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.toc-item a:hover, .toc-item a.active {
  color: var(--color-brand);
  background: var(--color-cloud);
  font-weight: 600;
}

.sidebar-cta-card {
  margin-top: 20px;
  background: linear-gradient(145deg, var(--color-cloud) 0%, #D8E7FD 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  text-align: center;
}

.sidebar-cta-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 6px;
}

.sidebar-cta-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}

/* Article Footer Nav */
.article-footer-nav {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid var(--color-border);
}

.article-nav-box {
  flex: 1;
  background: var(--color-cloud-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.article-nav-box:hover {
  background: var(--color-white);
  border-color: var(--color-brand);
  box-shadow: var(--shadow-sm);
}

.article-nav-direction {
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.article-nav-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-deep);
}

/* Search Modal Overlay */
.search-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(20, 44, 82, 0.6);
  backdrop-filter: blur(6px);
  z-index: 1000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 80px 20px 20px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.search-modal-backdrop.open {
  display: flex;
  opacity: 1;
}

.search-modal-container {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 45px rgba(20, 44, 82, 0.25);
  width: 100%;
  max-width: 640px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  transform: translateY(-20px);
  transition: transform var(--transition-fast);
}

.search-modal-backdrop.open .search-modal-container {
  transform: translateY(0);
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  gap: 12px;
}

.search-input-wrapper svg {
  width: 22px;
  height: 22px;
  color: var(--color-text-light);
  flex-shrink: 0;
}

.search-input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 1.1rem;
  font-family: inherit;
  color: var(--color-deep);
  background: transparent;
}

.search-close-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text-light);
  padding: 4px;
}

.search-results-area {
  max-height: 400px;
  overflow-y: auto;
  padding: 12px;
}

.search-result-item {
  display: block;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-fast);
  margin-bottom: 6px;
}

.search-result-item:hover, .search-result-item:focus {
  background-color: var(--color-cloud-soft);
}

.search-result-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 4px;
}

.search-result-snippet {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.search-empty {
  padding: 30px 20px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Site Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--color-deep);
  color: #B9CDE8;
  padding: 70px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  line-height: 1.65;
  color: #92AACB;
  max-width: 360px;
  margin-bottom: 20px;
}

.footer-heading {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 18px;
}

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

.footer-links a {
  color: #92AACB;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-disclaimer-box {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 0.82rem;
  line-height: 1.6;
  color: #839BBB;
  margin-bottom: 30px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.82rem;
  color: #728AA9;
  flex-wrap: wrap;
  gap: 12px;
}

/* 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;
  }
  .cloud-layer-1, .cloud-layer-2, .pulse-dot {
    animation: none !important;
  }
}

/* Responsive Media Queries */
@media (max-width: 1200px) {
  .nav-menu {
    gap: 12px;
  }
  .nav-link {
    font-size: 0.88rem;
    padding: 6px 2px;
  }
  .search-trigger-btn kbd {
    display: none;
  }
}

@media (max-width: 1024px) {
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .doc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tech-compare-container {
    grid-template-columns: 1fr;
  }
  .region-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .client-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .doc-layout-single-aside {
    grid-template-columns: 1fr;
  }
  .doc-layout {
    grid-template-columns: 1fr;
  }
  .sticky-sidebar {
    display: none; /* In tablet/mobile, article is full width without side TOC clutter */
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 992px) {
  .site-header {
    height: 64px;
  }
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    display: none;
    box-shadow: var(--shadow-lg);
    z-index: 99;
  }
  .nav-menu.open {
    display: flex;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .search-trigger-btn span {
    display: none;
  }
  .search-trigger-btn kbd {
    display: none;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 60px 0 70px;
  }
  .hero-title {
    font-size: 2.15rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .hero-stats {
    grid-template-columns: 1fr;
  }
  .doc-grid {
    grid-template-columns: 1fr;
  }
  .region-grid {
    grid-template-columns: 1fr;
  }
  .client-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .doc-article {
    padding: 24px 18px;
  }
  .article-main-title {
    font-size: 1.75rem;
  }
  .article-footer-nav {
    flex-direction: column;
  }
  .cta-banner {
    padding: 40px 20px;
  }
  .cta-title {
    font-size: 1.75rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}