/* ==========================================================================
   COCODUCK VPN - 瓷蓝科技 (Porcelain-Blue) 极简设计系统
   Palette:
     Porcelain White: #F9FBFC
     Navy:            #203A5B
     Ceramic Blue:    #7E9FBC
     Pale Silver:     #E5EDF2
   ========================================================================== */

:root {
  --color-porcelain: #F9FBFC;
  --color-porcelain-surface: #FFFFFF;
  --color-porcelain-subtle: #F2F6F9;
  --color-navy: #203A5B;
  --color-navy-dark: #14253A;
  --color-navy-light: #2D4C73;
  --color-ceramic: #7E9FBC;
  --color-ceramic-light: #A4BFD4;
  --color-ceramic-tint: rgba(126, 159, 188, 0.12);
  --color-pale-silver: #E5EDF2;
  --color-silver-light: #EDF3F7;
  --color-text-main: #203A5B;
  --color-text-secondary: #486581;
  --color-text-muted: #627D98;
  --color-text-light: #829AB1;
  
  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --h1-size-desktop: 53px;
  --h1-size-mobile: 35px;
  --body-size: 17px;
  --body-line-height: 1.75;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  --shadow-subtle: 0 4px 16px rgba(32, 58, 91, 0.04);
  --shadow-tile: 0 10px 30px rgba(32, 58, 91, 0.06);
  --border-delicate: 1px solid var(--color-pale-silver);
  --transition-normal: 0.25s ease;
}

/* CSS Reset & Base */
*, *::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);
  font-size: var(--body-size);
  line-height: var(--body-line-height);
  color: var(--color-text-main);
  background-color: var(--color-porcelain);
  overflow-x: hidden;
  max-width: 100%;
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, .serif-heading {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--color-navy);
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--h1-size-mobile);
  line-height: 1.25;
  margin-bottom: 20px;
}

@media (min-width: 768px) {
  h1 {
    font-size: 42px;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: var(--h1-size-desktop);
  }
}

h2 {
  font-size: 28px;
  line-height: 1.35;
  margin-bottom: 14px;
}

@media (min-width: 768px) {
  h2 {
    font-size: 34px;
  }
}

h3 {
  font-size: 20px;
  line-height: 1.4;
  margin-bottom: 10px;
}

p {
  color: var(--color-text-secondary);
  font-size: var(--body-size);
  line-height: var(--body-line-height);
  margin-bottom: 16px;
}

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

a {
  color: var(--color-navy);
  text-decoration: none;
  transition: color var(--transition-normal);
}

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

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container {
    padding-left: 32px;
    padding-right: 32px;
  }
}

.section {
  padding-top: 60px;
  padding-bottom: 60px;
}

@media (min-width: 768px) {
  .section {
    padding-top: 88px;
    padding-bottom: 88px;
  }
}

.section-header {
  margin-bottom: 40px;
  max-width: 760px;
}

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

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-navy);
  background-color: var(--color-porcelain-subtle);
  border: 1px solid var(--color-pale-silver);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

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

/* Delicate Outlines & Porcelain Panels */
.porcelain-panel {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-subtle);
  transition: border-color var(--transition-normal);
}

.porcelain-panel:hover {
  border-color: var(--color-ceramic);
}

/* Buttons */
.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid transparent;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-navy);
  color: var(--color-porcelain);
  border-color: var(--color-navy);
}

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

.btn-secondary {
  background-color: var(--color-porcelain);
  color: var(--color-navy);
  border-color: var(--color-pale-silver);
}

.btn-secondary:hover {
  background-color: var(--color-porcelain-surface);
  border-color: var(--color-ceramic);
  color: var(--color-navy);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(249, 251, 252, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--border-delicate);
}

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

.logo-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-navy);
}

.logo-brand svg {
  width: 28px;
  height: 28px;
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 24px;
}

@media (min-width: 1024px) {
  .nav-desktop {
    display: flex;
  }
}

.nav-desktop a {
  font-size: 15px;
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: 6px 0;
  position: relative;
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-navy);
}

.nav-desktop a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-ceramic);
  transition: width var(--transition-normal);
}

.nav-desktop a:hover::after,
.nav-desktop a.active::after {
  width: 100%;
}

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

@media (min-width: 768px) {
  .header-cta {
    display: flex;
  }
}

/* Mobile Menu Button */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  background: transparent;
  border: 1px solid var(--color-pale-silver);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
}

@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-navy);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background-color: var(--color-porcelain-surface);
  border-bottom: var(--border-delicate);
  box-shadow: 0 16px 32px rgba(32, 58, 91, 0.08);
  padding: 24px 20px;
  z-index: 999;
}

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

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.mobile-nav-links a {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-navy);
  display: block;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-pale-silver);
}

/* ==========================================================================
   Hero Section: Left Copy + Right Porcelain Dashboard
   ========================================================================== */
.hero-section {
  padding-top: 40px;
  padding-bottom: 60px;
  background: linear-gradient(180deg, #F9FBFC 0%, #F0F4F8 100%);
  border-bottom: var(--border-delicate);
  position: relative;
}

@media (min-width: 1024px) {
  .hero-section {
    padding-top: 70px;
    padding-bottom: 90px;
  }
}

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

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1.15fr 1fr;
    gap: 48px;
  }
}

.hero-copy {
  max-width: 600px;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-navy);
  background-color: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--color-pale-silver);
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero-pill-badge .indicator {
  width: 7px;
  height: 7px;
  background-color: var(--color-ceramic);
  border-radius: 50%;
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

.hero-metrics-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--color-pale-silver);
}

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

.hero-metric-label {
  font-size: 13px;
  color: var(--color-text-muted);
}

.hero-metric-val {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-navy);
}

/* ==========================================================================
   Stacked Porcelain Tiles Dashboard (Hero Right)
   Delicate outlines, open whitespace, slow route highlight traveling along one route
   ========================================================================== */
.hero-dashboard-container {
  position: relative;
  width: 100%;
}

.porcelain-stack-card {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-tile);
  position: relative;
}

.dashboard-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--color-silver-light);
}

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

.dash-status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-ceramic);
  border-radius: 50%;
}

.dash-title-text {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-navy);
}

.dash-sys-tag {
  font-size: 12px;
  color: var(--color-text-muted);
  background-color: var(--color-porcelain-subtle);
  border: 1px solid var(--color-pale-silver);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

/* Route SVG Map */
.route-map-canvas {
  width: 100%;
  height: 190px;
  background-color: var(--color-porcelain);
  border: 1px solid var(--color-pale-silver);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

.route-svg {
  width: 100%;
  height: 100%;
}

/* Route connection lines: delicate pale silver */
.route-line {
  stroke: var(--color-pale-silver);
  stroke-width: 1.5;
  stroke-dasharray: 3 3;
  fill: none;
}

/* Active route line: Ceramic blue highlight traveling along one route */
.route-active-line {
  stroke: var(--color-ceramic);
  stroke-width: 2;
  fill: none;
}

/* Moving pulse dot along the primary route: Hong Kong to Tokyo */
.route-tracer-dot {
  fill: var(--color-navy);
  stroke: var(--color-ceramic);
  stroke-width: 2;
  animation: routeTravel 7s linear infinite;
}

@keyframes routeTravel {
  0% {
    cx: 60;
    cy: 130;
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  85% {
    opacity: 1;
  }
  100% {
    cx: 200;
    cy: 50;
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .route-tracer-dot {
    animation: none;
    cx: 130;
    cy: 90;
    opacity: 0.8;
  }
}

/* Illustrative Tiles Grid */
.tiles-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.region-tile {
  background-color: var(--color-porcelain);
  border: 1px solid var(--color-pale-silver);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  transition: all var(--transition-normal);
}

.region-tile.active-route {
  border-color: var(--color-ceramic);
  background-color: rgba(126, 159, 188, 0.05);
}

.tile-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.tile-name {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-navy);
}

.tile-badge {
  font-size: 11px;
  color: var(--color-navy);
  background-color: rgba(32, 58, 91, 0.06);
  padding: 1px 6px;
  border-radius: 3px;
}

.tile-status {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* Asymmetric Two-Column Content Blocks */
.asym-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 900px) {
  .asym-grid-3 {
    grid-template-columns: 1.15fr 0.85fr 1fr;
  }
}

.asym-card {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.asym-card-header {
  margin-bottom: 18px;
}

.card-num-marker {
  font-family: var(--font-serif);
  font-size: 24px;
  color: var(--color-ceramic);
  margin-bottom: 8px;
}

.asym-card-title {
  font-family: var(--font-serif);
  font-size: 21px;
  color: var(--color-navy);
  margin-bottom: 10px;
}

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

/* ==========================================================================
   Global Nodes Network Section
   Illustrative network regions without invented ping, speed, or node totals
   ========================================================================== */
.nodes-table-card {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-top: 24px;
}

.nodes-matrix-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

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

@media (min-width: 1024px) {
  .nodes-matrix-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.node-matrix-item {
  border: 1px solid var(--color-silver-light);
  border-radius: var(--radius-sm);
  padding: 18px;
  background-color: var(--color-porcelain);
}

.node-region-code {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-ceramic);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.node-region-title {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--color-navy);
  margin-bottom: 8px;
}

.node-feature-list {
  list-style: none;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.node-feature-list li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 4px;
}

.node-feature-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-ceramic);
}

/* ==========================================================================
   AI & Streaming Use Cases (Useful Scenarios, NOT a Logo Wall)
   ========================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 900px) {
  .scenarios-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.scenario-panel {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  padding: 32px;
}

.scenario-panel-title {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--color-navy);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.scenario-panel-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-pale-silver);
}

.service-scenario-item {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-silver-light);
}

.service-scenario-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.service-tags-line {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.service-brand-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-navy);
  background-color: var(--color-porcelain-subtle);
  border: 1px solid var(--color-pale-silver);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.service-desc-body {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   Pricing Section: Comparison with Thin Horizontal Separators
   Editorial placeholders for missing prices, no invented numbers/ratings
   ========================================================================== */
.pricing-container {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
}

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

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

.pricing-table th {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--color-text-muted);
  font-weight: 600;
  background-color: var(--color-porcelain-subtle);
  letter-spacing: 0.04em;
}

.pricing-tier-name {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--color-navy);
  font-weight: 600;
  margin-bottom: 4px;
}

.pricing-placeholder-val {
  font-size: 14px;
  color: var(--color-text-muted);
  background-color: var(--color-porcelain-subtle);
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px dashed var(--color-pale-silver);
}

.pricing-recommended-row {
  background-color: rgba(126, 159, 188, 0.03);
}

.pricing-rec-badge {
  font-size: 11px;
  background-color: var(--color-navy);
  color: #FFFFFF;
  padding: 2px 6px;
  border-radius: 2px;
  margin-left: 6px;
  vertical-align: middle;
}

.pricing-editorial-note {
  margin-top: 18px;
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  background-color: var(--color-porcelain);
  border: 1px solid var(--color-pale-silver);
  padding: 14px 20px;
  border-radius: var(--radius-sm);
}

/* Mobile responsive pricing view */
@media (max-width: 767px) {
  .pricing-table, .pricing-table tbody, .pricing-table tr, .pricing-table td, .pricing-table th {
    display: block;
    width: 100%;
  }
  .pricing-table thead {
    display: none;
  }
  .pricing-table tr {
    padding: 20px;
    border-bottom: 2px solid var(--color-pale-silver);
  }
  .pricing-table td {
    padding: 8px 0;
    border-bottom: 1px dashed var(--color-silver-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .pricing-table td:last-child {
    border-bottom: none;
    padding-top: 14px;
    justify-content: flex-start;
  }
  .pricing-table td::before {
    content: attr(data-label);
    font-size: 13px;
    color: var(--color-text-muted);
    font-weight: 500;
  }
}

/* ==========================================================================
   Articles Section: 9 SEO Article Cards (3 Desktop / 2 Tablet / 1 Mobile)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.article-card {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

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

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.article-card-cat {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-navy);
  background-color: var(--color-porcelain-subtle);
  border: 1px solid var(--color-pale-silver);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.article-card-title {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--color-navy);
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-card-title a {
  color: inherit;
}

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

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

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

.article-read-link {
  font-weight: 500;
  color: var(--color-navy);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-link:hover {
  color: var(--color-ceramic);
}

/* ==========================================================================
   Testimonials Section: Explicitly Marked Sample Testimonials
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

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

@media (min-width: 1024px) {
  .testimonials-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.testimonial-tile {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.sample-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
  background-color: var(--color-porcelain-subtle);
  border: 1px solid var(--color-pale-silver);
  padding: 2px 6px;
  border-radius: 2px;
  margin-bottom: 12px;
}

.testimonial-quote {
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.testimonial-author {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-navy);
}

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

/* ==========================================================================
   FAQ Section: Semantic Accordion
   ========================================================================== */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.faq-item {
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.faq-item:hover {
  border-color: var(--color-ceramic);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--color-navy);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

.faq-icon {
  font-size: 18px;
  color: var(--color-ceramic);
  transition: transform var(--transition-normal);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 22px 20px 22px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--color-silver-light);
  padding-top: 14px;
}

/* ==========================================================================
   Footer: Clean, Delicate, PBN Dofollow Links & Internal Nav
   ========================================================================== */
.site-footer {
  background-color: var(--color-porcelain-surface);
  border-top: var(--border-delicate);
  padding-top: 60px;
  padding-bottom: 40px;
  margin-top: 60px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-pale-silver);
}

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

.footer-brand-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-top: 12px;
  max-width: 360px;
}

.footer-column-title {
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--color-navy);
  margin-bottom: 16px;
}

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

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

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

/* PBN Friendly Links Row: Dofollow, Distinct styling */
.footer-friendly-row {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-silver-light);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.friendly-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.friendly-link {
  font-size: 13px;
  color: var(--color-navy);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: var(--color-ceramic);
  text-underline-offset: 3px;
  transition: color var(--transition-normal);
}

.friendly-link:hover {
  color: var(--color-ceramic);
}

.footer-bottom-bar {
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
  font-size: 13px;
  color: var(--color-text-light);
}

@media (min-width: 768px) {
  .footer-bottom-bar {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ==========================================================================
   Article Single Page & Content Pages (About, Terms, Privacy, Tutorial, Sitemap)
   ========================================================================== */
.breadcrumbs-bar {
  padding: 16px 0;
  font-size: 14px;
  color: var(--color-text-muted);
}

.breadcrumbs-bar a {
  color: var(--color-text-secondary);
}

.breadcrumbs-bar a:hover {
  color: var(--color-navy);
}

.breadcrumbs-bar span {
  margin: 0 8px;
  color: var(--color-pale-silver);
}

.article-content-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 30px 0 60px 0;
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-pale-silver);
}

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

.article-body {
  font-size: 17px;
  line-height: 1.85;
  color: #2C3E50;
}

.article-body h2 {
  font-size: 26px;
  margin-top: 40px;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-silver-light);
}

.article-body h3 {
  font-size: 20px;
  margin-top: 28px;
  margin-bottom: 14px;
}

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

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

.article-body blockquote {
  background-color: var(--color-porcelain-subtle);
  border-left: 3px solid var(--color-ceramic);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 16px;
  color: var(--color-text-secondary);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 15px;
}

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

.article-body th {
  background-color: var(--color-porcelain-subtle);
  font-family: var(--font-serif);
  color: var(--color-navy);
}

.article-figure {
  margin: 28px 0;
  border: var(--border-delicate);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-porcelain-surface);
}

.article-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-porcelain-subtle);
  border-top: 1px solid var(--color-silver-light);
}

.related-articles-box {
  margin-top: 48px;
  padding: 28px;
  background-color: var(--color-porcelain-surface);
  border: var(--border-delicate);
  border-radius: var(--radius-md);
}

.related-articles-title {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-navy);
  margin-bottom: 16px;
}

.related-links-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 640px) {
  .related-links-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.related-link-card {
  padding: 14px 18px;
  background-color: var(--color-porcelain);
  border: 1px solid var(--color-pale-silver);
  border-radius: var(--radius-sm);
  display: block;
}

.related-link-card:hover {
  border-color: var(--color-ceramic);
}

.related-link-card .title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-navy);
  margin-bottom: 4px;
}

.related-link-card .snippet {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Responsive Breakpoints & Protections
   Checked widths: 375px, 390px, 430px, 768px, 1024px, 1440px
   ========================================================================== */
@media (max-width: 430px) {
  .btn-group {
    flex-direction: column;
    width: 100%;
  }
  .btn-group .btn {
    width: 100%;
  }
  .tiles-grid {
    grid-template-columns: 1fr;
  }
  .pricing-table td {
    font-size: 14px;
  }
  .hero-metrics-strip {
    gap: 14px;
  }
}

@media (min-width: 1440px) {
  .container {
    max-width: 1320px;
  }
}