/* ==========================================================================
   可可云 (KeKeyun) - 官方网站样式表
   DESIGN: Moving isometric network city (等轴测网络城市)
   Colors: #FFFFFF (White), #405B74 (Slate Blue), #BD7E65 (Terracotta), #F0EFEB (Pale Stone)
   Headings: Chinese Serif | Body: Clean Sans-Serif | Location Tags: Monospace
   ========================================================================== */

:root {
  --color-white: #FFFFFF;
  --color-slate: #405B74;
  --color-slate-dark: #2B3D4E;
  --color-slate-light: #5A7B9A;
  --color-slate-subtle: rgba(64, 91, 116, 0.08);
  --color-terracotta: #BD7E65;
  --color-terracotta-dark: #9F624C;
  --color-terracotta-light: #D49680;
  --color-terracotta-subtle: rgba(189, 126, 101, 0.12);
  --color-pale-stone: #F0EFEB;
  --color-pale-stone-dark: #E2DFD7;
  --color-pale-stone-light: #F9F8F6;
  --color-border: rgba(64, 91, 116, 0.15);
  --color-text-main: #243340;
  --color-text-muted: #5A6D7C;
  --color-text-light: #7E90A0;

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", STSong, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "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: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(64, 91, 116, 0.06);
  --shadow-md: 0 8px 24px rgba(64, 91, 116, 0.08);
  --shadow-lg: 0 16px 40px rgba(64, 91, 116, 0.12);

  --transition-fast: 0.2s cubic-bezier(0.2, 0, 0, 1);
  --transition-normal: 0.35s cubic-bezier(0.2, 0, 0, 1);
}

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

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.68;
  color: var(--color-text-main);
  background-color: var(--color-white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, .serif-heading {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-slate-dark);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 58px;
}

h2 {
  font-size: 36px;
  margin-bottom: 16px;
}

h3 {
  font-size: 24px;
  margin-bottom: 12px;
}

p {
  margin-bottom: 1rem;
}

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

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

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

.mono-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding-top: 88px;
  padding-bottom: 88px;
}

.section-bg-stone {
  background-color: var(--color-pale-stone-light);
  border-top: 1px solid var(--color-pale-stone-dark);
  border-bottom: 1px solid var(--color-pale-stone-dark);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--color-pale-stone);
  color: var(--color-slate);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.section-eyebrow .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-terracotta);
}

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

/* Buttons & CTA */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  text-align: center;
  line-height: 1;
}

.btn-primary {
  background-color: var(--color-terracotta);
  color: var(--color-white);
  border-color: var(--color-terracotta);
  box-shadow: 0 4px 14px rgba(189, 126, 101, 0.28);
}

.btn-primary:hover {
  background-color: var(--color-terracotta-dark);
  border-color: var(--color-terracotta-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(189, 126, 101, 0.38);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-slate);
  border: 1px solid var(--color-slate);
}

.btn-secondary:hover {
  background-color: var(--color-pale-stone);
  color: var(--color-slate-dark);
  border-color: var(--color-slate-dark);
  transform: translateY(-2px);
}

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

.btn-block {
  width: 100%;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-slate-dark);
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.brand-tagline {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-terracotta);
  border: 1px solid var(--color-terracotta-subtle);
  background-color: var(--color-pale-stone-light);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  margin-left: 4px;
}

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

.nav-desktop a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-slate-dark);
  position: relative;
  padding: 4px 0;
}

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

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: var(--color-slate-dark);
}

.mobile-menu-btn svg {
  width: 26px;
  height: 26px;
}

.nav-mobile {
  display: none;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 24px 24px 24px;
}

.nav-mobile.is-active {
  display: block;
}

.nav-mobile-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

.nav-mobile-links a {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-slate-dark);
  padding: 8px 0;
  border-bottom: 1px solid var(--color-pale-stone);
}

/* ==========================================================================
   Hero Section & Moving Isometric Network City
   ========================================================================== */
.hero-section {
  position: relative;
  padding-top: 64px;
  padding-bottom: 84px;
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-pale-stone-light) 100%);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
}

.hero-copy {
  z-index: 2;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-slate);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-pill .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-terracotta);
  box-shadow: 0 0 0 3px var(--color-terracotta-subtle);
}

.hero-h1 {
  font-size: 58px;
  line-height: 1.18;
  margin-bottom: 22px;
  color: var(--color-slate-dark);
}

.hero-h1 .brand-accent {
  color: var(--color-terracotta);
}

.hero-desc {
  font-size: 18px;
  line-height: 1.68;
  color: var(--color-text-muted);
  margin-bottom: 34px;
  max-width: 560px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-meta-badges {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--color-terracotta);
}

/* Isometric Network City Viewport */
.hero-iso-container {
  position: relative;
  width: 100%;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1000px;
}

.iso-scene {
  position: relative;
  width: 420px;
  height: 420px;
  transform-style: preserve-3d;
  transform: rotateX(55deg) rotateZ(-40deg);
  transition: transform 0.5s ease;
}

/* Isometric Ground Plane Grid */
.iso-ground {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 24px;
  background-color: var(--color-pale-stone);
  border: 2px solid var(--color-slate-subtle);
  box-shadow: 0 24px 60px rgba(64, 91, 116, 0.16);
  background-image: 
    linear-gradient(to right, rgba(64, 91, 116, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(64, 91, 116, 0.08) 1px, transparent 1px);
  background-size: 35px 35px;
}

/* SVG Routes on the Isometric Plane */
.iso-routes-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
}

.iso-route-path {
  fill: none;
  stroke: var(--color-slate-light);
  stroke-width: 2.5;
  stroke-dasharray: 6 6;
  opacity: 0.65;
}

.iso-route-elevated {
  fill: none;
  stroke: var(--color-terracotta);
  stroke-width: 2.5;
  stroke-dasharray: 4 4;
  opacity: 0.85;
}

/* Small Traveling Light */
.packet-light {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-terracotta);
  box-shadow: 0 0 10px 4px rgba(189, 126, 101, 0.7);
  top: 0;
  left: 0;
  pointer-events: none;
  animation: travelLight 14s linear infinite;
  z-index: 20;
}

@keyframes travelLight {
  0% { transform: translate(75px, 85px); }
  25% { transform: translate(320px, 75px); }
  50% { transform: translate(330px, 310px); }
  75% { transform: translate(90px, 320px); }
  100% { transform: translate(75px, 85px); }
}

/* 4 Simplified Isometric Regional Building Blocks */
.iso-block {
  position: absolute;
  width: 74px;
  height: 74px;
  transform-style: preserve-3d;
  cursor: default;
  animation: buildingSubtleFloat 6s ease-in-out infinite alternate;
}

.iso-block:hover {
  filter: brightness(1.05);
}

/* Subtle bobbing of only a few pixels */
@keyframes buildingSubtleFloat {
  0% { transform: translateZ(0px) translateY(0px); }
  100% { transform: translateZ(4px) translateY(-3px); }
}

/* Hong Kong Block (Terracotta) */
.block-hk {
  top: 60px;
  left: 50px;
  animation-delay: 0s;
}

/* Japan Block (Slate Blue) */
.block-jp {
  top: 50px;
  left: 290px;
  animation-delay: 1.2s;
}

/* Singapore Block (Terracotta) */
.block-sg {
  top: 280px;
  left: 300px;
  animation-delay: 2.4s;
}

/* US West Block (Slate Blue) */
.block-us {
  top: 290px;
  left: 60px;
  animation-delay: 3.6s;
}

/* Isometric Prism Faces */
.cube-face {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.cube-top {
  transform: translateZ(50px);
  background-color: var(--color-white);
  border: 1.5px solid var(--color-border);
  box-shadow: inset 0 0 12px rgba(64, 91, 116, 0.08);
}

.block-hk .cube-top, .block-sg .cube-top {
  border-color: var(--color-terracotta-light);
}

.block-jp .cube-top, .block-us .cube-top {
  border-color: var(--color-slate-light);
}

.cube-left {
  width: 100%;
  height: 50px;
  bottom: 0;
  transform-origin: bottom;
  transform: rotateX(-90deg);
}

.block-hk .cube-left, .block-sg .cube-left {
  background: linear-gradient(180deg, var(--color-terracotta) 0%, var(--color-terracotta-dark) 100%);
}

.block-jp .cube-left, .block-us .cube-left {
  background: linear-gradient(180deg, var(--color-slate) 0%, var(--color-slate-dark) 100%);
}

.cube-right {
  width: 50px;
  height: 100%;
  right: 0;
  transform-origin: right;
  transform: rotateY(90deg);
}

.block-hk .cube-right, .block-sg .cube-right {
  background: linear-gradient(90deg, var(--color-terracotta-dark) 0%, #854F3C 100%);
}

.block-jp .cube-right, .block-us .cube-right {
  background: linear-gradient(90deg, var(--color-slate-dark) 0%, #202E3B 100%);
}

/* Monospace Location Labels inside blocks */
.block-label-wrap {
  text-align: center;
}

.block-code {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-slate-dark);
}

.block-city {
  font-size: 10px;
  font-weight: 600;
  color: var(--color-terracotta);
}

.block-jp .block-city, .block-us .block-city {
  color: var(--color-slate);
}

.iso-legend {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(255, 255, 255, 0.9);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  font-size: 12px;
  color: var(--color-text-muted);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   Advantages Section: Alternating Text & Diagram Layouts
   ========================================================================== */
.advantages-list {
  display: flex;
  flex-direction: column;
  gap: 72px;
}

.advantage-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 56px;
}

.advantage-item.is-reversed {
  direction: rtl;
}

.advantage-item.is-reversed > * {
  direction: ltr;
}

.advantage-content {
  max-width: 500px;
}

.advantage-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-terracotta);
  background-color: var(--color-terracotta-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.advantage-title {
  font-size: 32px;
  margin-bottom: 16px;
  color: var(--color-slate-dark);
}

.advantage-desc {
  font-size: 17px;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.advantage-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.advantage-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--color-text-main);
}

.advantage-points svg {
  width: 18px;
  height: 18px;
  color: var(--color-slate);
  flex-shrink: 0;
  margin-top: 3px;
}

/* Diagram Cards */
.diagram-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.diagram-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-pale-stone);
  padding-bottom: 14px;
  margin-bottom: 24px;
}

.diagram-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-slate);
}

.diagram-pill {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 8px;
  background-color: var(--color-pale-stone);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
}

.diagram-flow {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.flow-node-step {
  display: flex;
  align-items: center;
  gap: 14px;
  background-color: var(--color-pale-stone-light);
  border: 1px solid var(--color-border);
  padding: 12px 18px;
  border-radius: var(--radius-md);
}

.flow-node-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-slate);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}

.flow-node-text h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-slate-dark);
  font-family: var(--font-sans);
  margin-bottom: 2px;
}

.flow-node-text p {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.flow-connector {
  width: 2px;
  height: 18px;
  background-color: var(--color-terracotta);
  margin: -6px 0 -6px 36px;
  position: relative;
}

.flow-connector::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: -3px;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--color-terracotta);
}

/* ==========================================================================
   Nodes Section: Region Directory
   ========================================================================== */
.nodes-directory {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.node-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

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

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

.node-code {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-terracotta);
  background-color: var(--color-terracotta-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.node-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--color-slate);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #2E7D32;
}

.node-name {
  font-size: 20px;
  margin-bottom: 6px;
  color: var(--color-slate-dark);
}

.node-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.node-features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--color-pale-stone);
  padding-top: 14px;
}

.node-feat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--color-text-muted);
}

.node-feat-item span:last-child {
  font-family: var(--font-mono);
  color: var(--color-slate);
  font-weight: 600;
}

.nodes-disclaimer {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-pale-stone);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  max-width: 680px;
  margin: 0 auto;
}

/* ==========================================================================
   AI & Streaming Panels (Separate Use-Case Panels)
   ========================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.scenario-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.scenario-panel-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-pale-stone);
}

.scenario-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.scenario-panel-ai .scenario-icon {
  background-color: var(--color-terracotta-subtle);
  color: var(--color-terracotta);
}

.scenario-panel-stream .scenario-icon {
  background-color: var(--color-slate-subtle);
  color: var(--color-slate);
}

.scenario-panel-header h3 {
  font-size: 24px;
  margin-bottom: 4px;
}

.scenario-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
}

.scenario-intro {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.scenario-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scenario-card-item {
  background-color: var(--color-pale-stone-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
}

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

.scenario-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-slate-dark);
}

.scenario-card-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.scenario-card-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 0;
  line-height: 1.5;
}

/* ==========================================================================
   Pricing Section: Flat Comparison Table / Grid
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
  margin-bottom: 32px;
}

.pricing-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

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

.pricing-card.is-featured {
  border: 2px solid var(--color-terracotta);
  background: linear-gradient(180deg, #FFFDFB 0%, var(--color-white) 100%);
  box-shadow: 0 12px 32px rgba(189, 126, 101, 0.16);
}

.pricing-ribbon {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-terracotta);
  color: var(--color-white);
  font-size: 12px;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.pricing-tier-name {
  font-size: 22px;
  color: var(--color-slate-dark);
  margin-bottom: 6px;
}

.pricing-tier-sub {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  min-height: 38px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-pale-stone);
}

.pricing-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-slate-dark);
}

.pricing-amount {
  font-family: var(--font-serif);
  font-size: 42px;
  font-weight: 700;
  color: var(--color-slate-dark);
  line-height: 1;
}

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

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-main);
}

.pricing-features svg {
  width: 16px;
  height: 16px;
  color: var(--color-slate);
  flex-shrink: 0;
  margin-top: 3px;
}

.pricing-card.is-featured .pricing-features svg {
  color: var(--color-terracotta);
}

.pricing-editorial-note {
  font-size: 12px;
  color: var(--color-text-light);
  margin-top: 12px;
  text-align: center;
}

.pricing-disclaimer {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-light);
  max-width: 760px;
  margin: 0 auto;
}

/* ==========================================================================
   Editorial Article Cards: 9-card Grid (3 Desktop / 2 Tablet / 1 Mobile)
   Placed directly after pricing section
   ========================================================================== */
.articles-editorial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-terracotta);
  box-shadow: var(--shadow-md);
}

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

.article-category {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-terracotta);
  background-color: var(--color-terracotta-subtle);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.article-card-title {
  font-size: 20px;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--color-slate-dark);
}

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

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

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

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

.article-read-more {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
  color: var(--color-slate);
}

.article-read-more svg {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

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

/* ==========================================================================
   Testimonials Section (3-6 Labeled Sample / Sourced Testimonials)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.testimonial-sample-tag {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-light);
  background-color: var(--color-pale-stone);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.testimonial-quote {
  font-size: 15px;
  color: var(--color-text-main);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
  font-style: normal;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--color-pale-stone);
  padding-top: 14px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-pale-stone);
  color: var(--color-slate);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
  border: 1px solid var(--color-border);
}

.author-info h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-slate-dark);
  font-family: var(--font-sans);
  margin-bottom: 2px;
}

.author-info p {
  font-size: 12px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 22px 24px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-slate-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.faq-question:hover {
  background-color: var(--color-pale-stone-light);
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--color-terracotta);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

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

.faq-answer {
  padding: 0 24px 22px 24px;
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
  display: none;
}

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

/* ==========================================================================
   Footer & Footer Matrix (PBN links without nofollow)
   ========================================================================== */
.site-footer {
  background-color: var(--color-slate-dark);
  color: #D1DCE5;
  padding-top: 64px;
  padding-bottom: 40px;
  border-top: 3px solid var(--color-terracotta);
  font-size: 15px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  color: var(--color-white);
  font-size: 24px;
  margin-bottom: 12px;
}

.footer-brand p {
  color: #9EB2C2;
  font-size: 14px;
  line-height: 1.6;
  max-width: 360px;
}

.footer-links-col h4 {
  color: var(--color-white);
  font-size: 16px;
  margin-bottom: 16px;
  font-family: var(--font-sans);
  font-weight: 600;
}

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

.footer-links-list a {
  color: #B4C6D4;
  font-size: 14px;
  transition: color var(--transition-fast);
}

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

/* External Matrix / Recommended Guides Bar */
.footer-matrix-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  padding: 22px 0;
  margin-bottom: 28px;
  text-align: center;
}

.footer-matrix-title {
  font-size: 13px;
  color: #8CA3B5;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.footer-matrix-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-matrix-link {
  color: #E2DFD7;
  font-size: 14px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
}

.footer-matrix-link:hover {
  color: var(--color-white);
  background-color: rgba(189, 126, 101, 0.25);
  border-color: var(--color-terracotta);
}

.footer-bottom {
  text-align: center;
  font-size: 13px;
  color: #7A91A3;
  line-height: 1.6;
}

.footer-bottom p {
  margin-bottom: 4px;
}

/* ==========================================================================
   Article & Content Pages Layout (About, Terms, Privacy, Sitemap, Tutorial, Articles)
   ========================================================================== */
.page-hero {
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-pale-stone-light) 100%);
  border-bottom: 1px solid var(--color-border);
  padding: 56px 0 44px 0;
  text-align: center;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--color-slate);
}

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

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

.page-title {
  font-size: 42px;
  color: var(--color-slate-dark);
  margin-bottom: 14px;
}

.page-lead {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 720px;
  margin: 0 auto;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 64px 24px 88px 24px;
}

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

.article-content h2 {
  font-size: 28px;
  color: var(--color-slate-dark);
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-pale-stone);
}

.article-content h3 {
  font-size: 22px;
  color: var(--color-slate);
  margin-top: 32px;
  margin-bottom: 14px;
}

.article-content p {
  margin-bottom: 1.4rem;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.6rem;
  padding-left: 28px;
}

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

.article-callout {
  background-color: var(--color-pale-stone-light);
  border-left: 4px solid var(--color-terracotta);
  padding: 20px 24px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 32px 0;
}

.article-callout h4 {
  font-size: 16px;
  color: var(--color-slate-dark);
  margin-bottom: 8px;
  font-family: var(--font-sans);
}

.article-callout p {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.article-image-box {
  background-color: var(--color-pale-stone);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  margin: 36px 0;
  text-align: center;
}

.article-image-box svg, .article-image-box img {
  margin: 0 auto;
  border-radius: var(--radius-sm);
}

.article-image-caption {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 10px;
  font-style: italic;
}

.article-related-box {
  margin-top: 64px;
  padding-top: 40px;
  border-top: 1px solid var(--color-pale-stone-dark);
}

.article-related-box h3 {
  font-size: 24px;
  margin-bottom: 20px;
}

.article-related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.article-cta-box {
  background: linear-gradient(135deg, var(--color-slate-dark) 0%, var(--color-slate) 100%);
  color: var(--color-white);
  padding: 36px;
  border-radius: var(--radius-lg);
  margin: 48px 0;
  text-align: center;
}

.article-cta-box h3 {
  color: var(--color-white);
  font-size: 26px;
  margin-bottom: 12px;
}

.article-cta-box p {
  color: #D1DCE5;
  font-size: 16px;
  max-width: 600px;
  margin: 0 auto 24px auto;
}

/* ==========================================================================
   Reduced Motion & Pause Animations
   ========================================================================== */
.is-paused .packet-light,
.is-paused .iso-block {
  animation-play-state: paused !important;
}

@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;
  }
  
  .packet-light,
  .iso-block {
    animation: none !important;
  }

  .iso-scene {
    transform: rotateX(45deg) rotateZ(-30deg) !important;
  }
}

/* ==========================================================================
   Responsive Breakpoints: 1440px / 1024px / 768px / 430px / 390px / 375px
   ========================================================================== */

/* Tablet & Smaller Desktop (<= 1024px) */
@media (max-width: 1024px) {
  h1, .hero-h1 {
    font-size: 46px;
  }

  h2 {
    font-size: 32px;
  }

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

  .hero-iso-container {
    height: 400px;
  }

  .advantages-list {
    gap: 48px;
  }

  .advantage-item {
    gap: 36px;
  }

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

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

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

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

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .footer-brand {
    grid-column: span 2;
  }
}

/* Tablet Portrait & Mobile (<= 768px) */
@media (max-width: 768px) {
  .nav-desktop, .header-cta-desktop {
    display: none;
  }

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

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

  h1, .hero-h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
  }

  .advantage-item, .advantage-item.is-reversed {
    grid-template-columns: 1fr;
    direction: ltr;
    gap: 28px;
  }

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

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

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

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

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

  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: span 1;
  }

  .footer-matrix-links {
    flex-direction: column;
    gap: 12px;
  }
}

/* Small Mobile (<= 430px / 390px / 375px) */
@media (max-width: 430px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

  h1, .hero-h1 {
    font-size: 34px;
    line-height: 1.22;
  }

  .hero-desc {
    font-size: 16px;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }

  .nodes-directory {
    grid-template-columns: 1fr;
  }

  .hero-iso-container {
    height: 340px;
  }

  .iso-scene {
    width: 320px;
    height: 320px;
    transform: rotateX(55deg) rotateZ(-40deg) scale(0.85);
  }

  .block-hk { top: 40px; left: 30px; }
  .block-jp { top: 30px; left: 210px; }
  .block-sg { top: 210px; left: 220px; }
  .block-us { top: 220px; left: 40px; }
}