/* ==========================================================================
   Tangerine Index Theme - Style System
   Colors:
     White:              #FFFFFF
     Deep Graphite:      #292F31
     Softened Tangerine: #D58B57
     Pale Peach:         #F7EDE4
   Headings: Heavy rounded Chinese system sans-serif
   Body: Regular sans-serif, 18px body font
   ========================================================================== */

:root {
  --color-white: #FFFFFF;
  --color-graphite: #292F31;
  --color-tangerine: #D58B57;
  --color-tangerine-hover: #BF7442;
  --color-tangerine-light: rgba(213, 139, 87, 0.12);
  --color-peach: #F7EDE4;
  --color-peach-light: #FAF4EE;
  --color-text-muted: #5E676A;
  --color-border-slim: rgba(41, 47, 49, 0.12);
  --color-border-tangerine: rgba(213, 139, 87, 0.35);
  --color-status-green: #2E7D32;
  --color-badge-bg: #EEDCCE;

  --font-heading: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-subtle: 0 4px 16px rgba(41, 47, 49, 0.05);
  --shadow-elevated: 0 8px 24px rgba(41, 47, 49, 0.08);

  --max-width: 1200px;
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-graphite);
  background-color: var(--color-white);
  overflow-x: hidden;
  max-width: 100%;
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--color-graphite);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 34px; /* Mobile first */
}

@media (min-width: 768px) {
  h1 {
    font-size: 50px; /* Desktop specified */
    line-height: 1.15;
  }
}

h2 {
  font-size: 28px;
}

@media (min-width: 768px) {
  h2 {
    font-size: 36px;
  }
}

h3 {
  font-size: 20px;
}

@media (min-width: 768px) {
  h3 {
    font-size: 24px;
  }
}

p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

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

/* Container & Layout */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding: 0 2rem;
  }
}

/* Section Rhythm: Alternating Open (#FFFFFF) and Colored (#F7EDE4) */
.section {
  padding: 4.5rem 0;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding: 6rem 0;
  }
}

.section--open {
  background-color: var(--color-white);
}

.section--colored {
  background-color: var(--color-peach);
}

.section--subtle {
  background-color: var(--color-peach-light);
}

/* Slim Divider Line */
.slim-divider {
  border: 0;
  height: 1px;
  background-color: var(--color-border-slim);
  width: 100%;
  margin: 0;
}

/* Section Header with Oversized Section Number */
.section-header {
  margin-bottom: 3rem;
  position: relative;
}

.section-num-wrap {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.oversized-num {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 900;
  color: var(--color-tangerine);
  line-height: 1;
  letter-spacing: -0.05em;
  opacity: 0.85;
}

@media (min-width: 768px) {
  .oversized-num {
    font-size: 68px;
  }
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-tangerine-hover);
  background: var(--color-badge-bg);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

.section-title {
  margin-top: 0.5rem;
  margin-bottom: 0.75rem;
}

.section-desc {
  font-size: 1rem;
  max-width: 680px;
  color: var(--color-text-muted);
}

/* Buttons & Commercial CTA */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-tangerine);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(213, 139, 87, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-tangerine-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(213, 139, 87, 0.35);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-graphite);
  border: 1.5px solid var(--color-graphite);
}

.btn-secondary:hover {
  background-color: var(--color-graphite);
  color: var(--color-white);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-block {
  width: 100%;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-slim);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--color-graphite);
}

.logo-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background-color: var(--color-graphite);
  color: var(--color-tangerine);
  font-size: 0.875rem;
  font-family: var(--font-mono);
  font-weight: 900;
}

.nav-desktop {
  display: none;
}

@media (min-width: 1024px) {
  .nav-desktop {
    display: flex;
    align-items: center;
    gap: 1.75rem;
  }

  .nav-desktop a {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-graphite);
  }

  .nav-desktop a:hover {
    color: var(--color-tangerine);
  }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Mobile Hamburger Menu */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 32px;
  height: 32px;
  padding: 4px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

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

.menu-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--color-graphite);
  transition: all 0.3s ease;
  border-radius: 2px;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  height: calc(100vh - 72px);
  background-color: var(--color-white);
  padding: 2rem 1.5rem;
  flex-direction: column;
  gap: 1.5rem;
  overflow-y: auto;
  border-top: 1px solid var(--color-border-slim);
  z-index: 999;
}

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

.mobile-nav a {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-graphite);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border-slim);
}

.mobile-nav a:hover {
  color: var(--color-tangerine);
}

.mobile-nav-cta {
  margin-top: 1rem;
}

/* ==========================================================================
   Hero Section: Left Text + Right Numbered Regional Index Dashboard
   ========================================================================== */
.hero-section {
  padding: 3.5rem 0 4.5rem;
  background-color: var(--color-white);
  position: relative;
}

@media (min-width: 768px) {
  .hero-section {
    padding: 5rem 0 6rem;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.5rem;
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-badge-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.hero-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-graphite);
  background-color: var(--color-peach);
  border: 1px solid var(--color-border-tangerine);
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-full);
}

.hero-title {
  color: var(--color-graphite);
}

.hero-subtitle {
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--color-text-muted);
}

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

.hero-micro-notes {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.hero-micro-note {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-status-green);
  display: inline-block;
}

/* Numbered Regional Index Dashboard with 3D Motion (Hero Right) */
.index-dashboard-wrapper {
  perspective: 1200px;
  perspective-origin: center center;
  position: relative;
  width: 100%;
}

.index-dashboard {
  background-color: var(--color-peach);
  border: 1.5px solid var(--color-graphite);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: 0 16px 36px rgba(41, 47, 49, 0.12);
  transform-style: preserve-3d;
  transition: transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.25s ease;
  animation: floatDashboard3D 7s ease-in-out infinite;
  transform: rotateX(4deg) rotateY(-5deg) translateZ(0);
}

@keyframes floatDashboard3D {
  0%, 100% {
    transform: rotateX(4deg) rotateY(-5deg) translateY(0) translateZ(0);
    box-shadow: 0 16px 36px rgba(41, 47, 49, 0.12);
  }
  50% {
    transform: rotateX(1.5deg) rotateY(-2deg) translateY(-8px) translateZ(12px);
    box-shadow: 0 24px 48px rgba(213, 139, 87, 0.18);
  }
}

.dashboard-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border-slim);
  padding-bottom: 0.85rem;
  margin-bottom: 1rem;
}

.dashboard-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--color-graphite);
}

.dashboard-live {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-status-green);
  font-weight: 700;
}

.live-pulse {
  animation: livePingPulse 1.8s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes livePingPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(46, 125, 50, 0.7);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(46, 125, 50, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(46, 125, 50, 0);
  }
}

/* 3D Moving Global Network Topology Stage */
.dashboard-3d-stage {
  position: relative;
  width: 100%;
  height: 185px;
  margin-bottom: 1rem;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid var(--color-border-slim);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 2px 8px rgba(41, 47, 49, 0.04);
  cursor: grab;
  user-select: none;
}

.dashboard-3d-stage:active {
  cursor: grabbing;
}

.globe-3d-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-3d-badge {
  position: absolute;
  bottom: 8px;
  right: 10px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--color-graphite);
  background: rgba(247, 237, 228, 0.94);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-tangerine);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  pointer-events: none;
  box-shadow: 0 2px 6px rgba(41, 47, 49, 0.06);
}

.badge-orbit-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-tangerine);
  animation: badgeOrbitPulse 1.8s infinite;
}

@keyframes badgeOrbitPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.6; }
}

/* Route Markers Sequential Animation & 3D Depth Lift */
.route-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  transform-style: preserve-3d;
}

.route-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-white);
  border: 1px solid var(--color-border-slim);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.25s ease, box-shadow 0.28s ease;
  animation: routeMarkerFade 0.6s ease forwards;
  opacity: 0;
  box-shadow: 0 2px 8px rgba(41, 47, 49, 0.04);
}

.route-item::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, transparent, var(--color-tangerine), transparent);
  transition: width 0.35s ease;
  pointer-events: none;
}

.route-item:hover {
  transform: translateZ(22px) translateY(-2px) scale(1.015);
  border-color: var(--color-tangerine);
  box-shadow: 0 10px 22px rgba(213, 139, 87, 0.16);
}

.route-item:hover::after {
  width: 100%;
}

/* Sequential Stagger (once) */
.route-item:nth-child(1) { animation-delay: 0.15s; }
.route-item:nth-child(2) { animation-delay: 0.35s; }
.route-item:nth-child(3) { animation-delay: 0.55s; }
.route-item:nth-child(4) { animation-delay: 0.75s; }

@keyframes routeMarkerFade {
  0% {
    opacity: 0;
    transform: translateY(8px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .index-dashboard {
    animation: none !important;
    transform: none !important;
  }
  .route-item {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  .badge-orbit-dot, .live-pulse {
    animation: none !important;
  }
}

.route-main {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.route-index-num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--color-tangerine);
  min-width: 28px;
}

.route-region {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-graphite);
}

.route-sub {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.route-meta {
  text-align: right;
  font-family: var(--font-mono);
}

.route-ping {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-graphite);
}

.route-tag {
  font-size: 0.7rem;
  color: var(--color-tangerine-hover);
}

.dashboard-footer {
  margin-top: 1.25rem;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--color-border-slim);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ==========================================================================
   Section 01: Three Advantages (Vertical Feature Sequence)
   ========================================================================== */
.feature-sequence {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.feature-step {
  display: grid;
  grid-template-columns: 1fr;
  background-color: var(--color-white);
  border: 1px solid var(--color-border-slim);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  gap: 1.5rem;
  position: relative;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

@media (min-width: 768px) {
  .feature-step {
    grid-template-columns: 100px 1fr 1fr;
    align-items: center;
    padding: 2.25rem;
  }
}

.feature-step:hover {
  border-color: var(--color-tangerine);
  box-shadow: var(--shadow-subtle);
}

.feature-index {
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 900;
  color: var(--color-tangerine);
  line-height: 1;
}

.feature-content h3 {
  margin-bottom: 0.5rem;
}

.feature-detail-box {
  background-color: var(--color-peach-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  border-left: 3px solid var(--color-tangerine);
  font-size: 0.9rem;
}

.feature-detail-list li {
  margin-bottom: 0.4rem;
  position: relative;
  padding-left: 1.2rem;
  color: var(--color-graphite);
}

.feature-detail-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-tangerine);
  font-weight: 900;
}

/* ==========================================================================
   Section 02: Global Nodes (Illustrative Regions)
   ========================================================================== */
.nodes-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

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

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

.node-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-slim);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.node-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-tangerine);
  box-shadow: var(--shadow-subtle);
}

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

.node-code {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-graphite);
}

.node-badge {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  background-color: var(--color-peach);
  color: var(--color-tangerine-hover);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.node-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
}

.node-params {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  border-top: 1px dashed var(--color-border-slim);
  padding-top: 0.75rem;
}

.editorial-disclaimer {
  margin-top: 1.5rem;
  background-color: var(--color-white);
  border: 1px solid var(--color-border-slim);
  border-left: 3px solid var(--color-tangerine);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Section 03: AI & Streaming Scenarios
   ========================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

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

.scenario-card {
  background-color: var(--color-white);
  border: 1.5px solid var(--color-border-slim);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.scenario-card--ai {
  border-top: 4px solid var(--color-tangerine);
}

.scenario-card--stream {
  border-top: 4px solid var(--color-graphite);
}

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

.scenario-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
}

.scenario-tag--ai {
  background-color: var(--color-peach);
  color: var(--color-tangerine-hover);
}

.scenario-tag--stream {
  background-color: #E2E8F0;
  color: var(--color-graphite);
}

.scenario-tools-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tool-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: var(--color-peach-light);
  border: 1px solid var(--color-border-slim);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-graphite);
}

.scenario-features-list li {
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.95rem;
  color: var(--color-graphite);
}

.scenario-features-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-tangerine);
  font-weight: 900;
}

/* ==========================================================================
   Section 04: 4–5-Tier Pricing Comparison (Exactly One "推荐套餐")
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

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

@media (min-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.pricing-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-slim);
  border-radius: var(--radius-xl);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-elevated);
}

/* Exactly ONE Recommended Tier Highlight */
.pricing-card--recommended {
  border: 2px solid var(--color-tangerine);
  background-color: var(--color-peach-light);
  box-shadow: 0 10px 30px rgba(213, 139, 87, 0.15);
}

.pricing-recommended-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-tangerine);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 1.5rem;
}

.pricing-tier-name {
  font-size: 1.3rem;
  margin-bottom: 0.35rem;
}

.pricing-tier-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.pricing-price-box {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border-slim);
}

.pricing-price {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--color-graphite);
  line-height: 1;
}

.pricing-price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-tangerine);
}

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

.pricing-placeholder-note {
  font-size: 0.75rem;
  color: var(--color-tangerine-hover);
  margin-top: 0.35rem;
  font-style: italic;
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-grow: 1;
  font-size: 0.9rem;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  color: var(--color-graphite);
}

.pricing-check {
  color: var(--color-tangerine);
  font-weight: 900;
}

/* ==========================================================================
   Section 05: Nine SEO Cards (3 Desktop / 2 Tablet / 1 Mobile)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@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-white);
  border: 1px solid var(--color-border-slim);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

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

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.article-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-tangerine-hover);
  background-color: var(--color-peach);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.article-read-time {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 0.6rem;
}

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

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

.article-card-excerpt {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-border-slim);
  padding-top: 0.85rem;
  font-size: 0.8rem;
}

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

.article-link-action {
  font-weight: 700;
  color: var(--color-tangerine);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.article-link-action:hover {
  color: var(--color-tangerine-hover);
}

/* ==========================================================================
   Section 06: Testimonials (3–6 visibly sample cases)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-slim);
  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: 1.6;
  color: var(--color-graphite);
  margin-bottom: 1.25rem;
  position: relative;
}

.testimonial-quote::before {
  content: "“";
  font-size: 2rem;
  color: var(--color-tangerine);
  display: block;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px dashed var(--color-border-slim);
  padding-top: 0.85rem;
}

.author-avatar-text {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--color-peach);
  color: var(--color-tangerine-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
}

.author-info h4 {
  font-size: 0.9rem;
  margin-bottom: 0.15rem;
}

.author-info p {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.sample-disclaimer-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  background-color: var(--color-peach);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-top: 0.5rem;
}

/* ==========================================================================
   Section 07: FAQ Accordion
   ========================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 880px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-slim);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

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

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-graphite);
  cursor: pointer;
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--color-tangerine);
  transition: transform 0.3s ease;
}

.faq-item.is-active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 1.5rem 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  border-top: 1px solid var(--color-border-slim);
  padding-top: 1rem;
}

.faq-item.is-active .faq-answer {
  display: block;
}

/* ==========================================================================
   Site Footer: Tangerine Index Style + PBN Matrix Dofollow Links
   ========================================================================== */
.site-footer {
  background-color: var(--color-graphite);
  color: #DDE2E3;
  padding: 4.5rem 0 2rem;
  font-size: 0.9rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

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

.footer-brand h3 {
  color: var(--color-white);
  margin-bottom: 0.75rem;
  font-size: 1.35rem;
}

.footer-brand p {
  color: #A3ACB0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-nav-col h4 {
  color: var(--color-white);
  font-size: 1rem;
  margin-bottom: 1.25rem;
  font-family: var(--font-heading);
}

.footer-nav-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-nav-col a {
  color: #A3ACB0;
}

.footer-nav-col a:hover {
  color: var(--color-tangerine);
}

/* Matrix & PBN Dofollow Links Styling (Highlighted & Tasteful) */
.footer-matrix-links {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.5rem 0;
  margin-bottom: 2rem;
  text-align: center;
}

.matrix-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #8D979B;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.matrix-links-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.matrix-link {
  color: var(--color-tangerine);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.35rem 0.85rem;
  background-color: rgba(213, 139, 87, 0.12);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(213, 139, 87, 0.25);
  transition: all 0.2s ease;
}

.matrix-link:hover {
  background-color: var(--color-tangerine);
  color: var(--color-white);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8rem;
  color: #7A8488;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.footer-legal-disclaimer {
  max-width: 600px;
  line-height: 1.5;
}

/* ==========================================================================
   Article & Documentation Template Styles
   ========================================================================== */
.article-page-header {
  padding: 3.5rem 0 2.5rem;
  background-color: var(--color-peach-light);
  border-bottom: 1px solid var(--color-border-slim);
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--color-graphite);
  font-weight: 600;
}

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

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

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 1rem;
  flex-wrap: wrap;
}

.article-body-layout {
  padding: 3.5rem 0 5rem;
}

.article-content-wrapper {
  max-width: 860px;
  margin: 0 auto;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-graphite);
}

.article-content h2 {
  margin-top: 2.75rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-peach);
}

.article-content h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.article-content p {
  margin-bottom: 1.4rem;
  color: #3B4245;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.4rem;
  padding-left: 1.5rem;
}

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

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

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

.article-callout {
  background-color: var(--color-peach);
  border-left: 4px solid var(--color-tangerine);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
  font-size: 0.95rem;
}

.article-callout h4 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: var(--color-graphite);
}

.article-table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-slim);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.article-table th {
  background-color: var(--color-peach);
  color: var(--color-graphite);
  padding: 0.85rem 1rem;
  font-weight: 700;
  border-bottom: 1px solid var(--color-border-slim);
}

.article-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--color-border-slim);
  color: var(--color-graphite);
}

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

.article-table tr:hover {
  background-color: var(--color-peach-light);
}

.related-articles-section {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-border-slim);
}

.related-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

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

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

.related-article-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-slim);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-article-card:hover {
  border-color: var(--color-tangerine);
}

.related-article-card h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.related-article-card h4 a:hover {
  color: var(--color-tangerine);
}

.back-home-bar {
  margin-top: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1.25rem;
  background-color: var(--color-peach-light);
  border-radius: var(--radius-md);
}

/* ==========================================================================
   Utility Classes & Responsiveness Safeguards
   ========================================================================== */
.text-center { text-align: center; }
.text-tangerine { color: var(--color-tangerine); }
.font-mono { font-family: var(--font-mono); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Responsive Width Safeguards */
@media (max-width: 430px) {
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
  .pricing-card {
    padding: 1.5rem 1rem;
  }
  .feature-step {
    padding: 1.25rem 1rem;
  }
}