/* ==========================================================================
   BoostNet鏈哄満 官方网站 - 样式规范与交互设计
   主题色系：
   - 白色: #FFFFFF
   - 海洋蓝: #315B76
   - 柔和绿松石: #8BBFC0
   - 炭黑: #263238
   字体层级：
   - 大标题/小标题: 中文系统无衬线
   - 正文: 人文无衬线 (17px)
   - 节点微标: 等宽字体 (Monospace)
   - 桌面 H1: 54px / 移动端 H1: 35px
   ========================================================================== */

:root {
  --color-white: #FFFFFF;
  --color-ocean: #315B76;
  --color-ocean-dark: #224257;
  --color-ocean-light: #447494;
  --color-ocean-soft: rgba(49, 91, 118, 0.08);
  --color-turquoise: #8BBFC0;
  --color-turquoise-dark: #639ea0;
  --color-turquoise-soft: rgba(139, 191, 192, 0.15);
  --color-charcoal: #263238;
  --color-charcoal-light: #455A64;
  --color-charcoal-muted: #607D8B;
  --color-bg-body: #FFFFFF;
  --color-bg-subtle: #F6F9FA;
  --color-bg-card: #FFFFFF;
  --color-border: #E1E8ED;
  --color-border-light: #EEF3F6;

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

  --shadow-sm: 0 2px 6px rgba(38, 50, 56, 0.04);
  --shadow-md: 0 8px 24px rgba(38, 50, 56, 0.06);
  --shadow-lg: 0 16px 40px rgba(38, 50, 56, 0.08);
  --shadow-globe: 0 20px 50px rgba(49, 91, 118, 0.18);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --container-max: 1240px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* 基础重置与无障碍支持 */
*, *::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-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-charcoal);
  background-color: var(--color-bg-body);
  overflow-x: hidden;
  word-break: break-word;
  overflow-wrap: anywhere;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-charcoal);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
}

p {
  margin-bottom: 1.25rem;
  color: var(--color-charcoal-light);
}

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

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

ul, ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

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

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section {
  padding-top: 5.5rem;
  padding-bottom: 5.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.section-alt {
  background-color: var(--color-bg-subtle);
}

/* 章节头部统一规范 */
.section-header {
  text-align: center;
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 3.5rem;
}

.section-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-ocean);
  background: var(--color-turquoise-soft);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
  font-weight: 600;
  border: 1px solid rgba(139, 191, 192, 0.4);
}

.section-title {
  font-size: 2.25rem;
  color: var(--color-charcoal);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.12rem;
  color: var(--color-charcoal-muted);
  line-height: 1.65;
  margin-bottom: 0;
}

/* 按钮与交互控件 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
}

.btn-primary {
  background-color: var(--color-ocean);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(49, 91, 118, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-ocean-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(49, 91, 118, 0.35);
}

.btn-secondary {
  background-color: #FFFFFF;
  color: var(--color-ocean);
  border-color: var(--color-ocean);
}

.btn-secondary:hover {
  background-color: var(--color-ocean-soft);
  color: var(--color-ocean-dark);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-charcoal);
  border-color: var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-ocean);
  color: var(--color-ocean);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ==========================================================================
   Header 顶部导航栏
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-fast);
}

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

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--color-charcoal);
}

.brand-icon {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--color-charcoal-light);
  transition: color var(--transition-fast);
}

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

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

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-charcoal);
}

.menu-toggle:focus {
  outline: 2px solid var(--color-ocean);
}

/* ==========================================================================
   Hero 主视觉区与 3D 地球仪
   ========================================================================== */
.hero-section {
  position: relative;
  padding-top: 5rem;
  padding-bottom: 5.5rem;
  background: radial-gradient(circle at 85% 30%, rgba(139, 191, 192, 0.12) 0%, rgba(255, 255, 255, 0) 70%),
              radial-gradient(circle at 10% 70%, rgba(49, 91, 118, 0.05) 0%, rgba(255, 255, 255, 0) 60%),
              #FFFFFF;
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

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

.hero-copy {
  max-width: 640px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-ocean);
  background: var(--color-turquoise-soft);
  border: 1px solid rgba(139, 191, 192, 0.5);
  padding: 0.4rem 0.95rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
}

.hero-badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-ocean);
  box-shadow: 0 0 0 rgba(49, 91, 118, 0.5);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { box-shadow: 0 0 0 0 rgba(49, 91, 118, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(49, 91, 118, 0); }
  100% { box-shadow: 0 0 0 0 rgba(49, 91, 118, 0); }
}

.hero-title {
  font-size: 54px;
  font-weight: 800;
  color: var(--color-charcoal);
  line-height: 1.16;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-title .brand-highlight {
  color: var(--color-ocean);
  position: relative;
  display: inline-block;
}

.hero-desc {
  font-size: 17px;
  line-height: 1.75;
  color: var(--color-charcoal-light);
  margin-bottom: 2.25rem;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.1rem;
  margin-bottom: 2.25rem;
}

.hero-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
}

.hero-spec-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.92rem;
  color: var(--color-charcoal-muted);
}

.hero-spec-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-turquoise-dark);
}

/* 3D 地球仪视效容器 */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1200px;
}

.globe-viewport {
  position: relative;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #FFFFFF 0%, #F0F6F8 50%, #D8E7ED 100%);
  box-shadow: inset 0 0 45px rgba(49, 91, 118, 0.22),
              0 24px 60px rgba(38, 50, 56, 0.12);
  border: 1px solid rgba(139, 191, 192, 0.4);
  transform-style: preserve-3d;
  overflow: visible;
}

.globe-stage {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  transform-style: preserve-3d;
  animation: globeSpin 28s linear infinite;
  transform: rotateX(15deg);
}

@keyframes globeSpin {
  0% { transform: rotateX(15deg) rotateY(0deg); }
  100% { transform: rotateX(15deg) rotateY(360deg); }
}

/* 经纬度线与骨架 */
.globe-ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 1px solid rgba(49, 91, 118, 0.2);
  pointer-events: none;
}

.globe-ring-lat-equator {
  transform: rotateX(90deg);
  border-color: rgba(49, 91, 118, 0.35);
  border-width: 1.5px;
}

.globe-ring-lat-north {
  top: 15%;
  left: 15%;
  width: 70%;
  height: 70%;
  transform: rotateX(90deg) translateZ(60px);
  border-color: rgba(139, 191, 192, 0.4);
}

.globe-ring-lat-south {
  top: 15%;
  left: 15%;
  width: 70%;
  height: 70%;
  transform: rotateX(90deg) translateZ(-60px);
  border-color: rgba(139, 191, 192, 0.4);
}

.globe-ring-lon-0 { transform: rotateY(0deg); }
.globe-ring-lon-30 { transform: rotateY(30deg); }
.globe-ring-lon-60 { transform: rotateY(60deg); }
.globe-ring-lon-90 { transform: rotateY(90deg); }
.globe-ring-lon-120 { transform: rotateY(120deg); }
.globe-ring-lon-150 { transform: rotateY(150deg); }

/* 地球表面 SVG 航线与枢纽节点 */
.globe-overlay-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  overflow: hidden;
  pointer-events: none;
}

.route-arc {
  fill: none;
  stroke: var(--color-ocean);
  stroke-width: 2.2;
  stroke-dasharray: 6 4;
  animation: dashMove 14s linear infinite;
}

.route-arc-alt {
  stroke: var(--color-turquoise-dark);
  stroke-width: 2;
  stroke-dasharray: 5 3;
}

@keyframes dashMove {
  to { stroke-dashoffset: -100; }
}

/* 核心枢纽浮标卡片 (Monospace 标签) */
.hub-tag {
  position: absolute;
  z-index: 10;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  pointer-events: auto;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.hub-tag:hover {
  transform: scale(1.05);
  border-color: var(--color-ocean);
}

.hub-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-ocean);
}

.hub-indicator-active {
  background: #2E7D32;
  box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.2);
}

.hub-code {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-charcoal);
}

.hub-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ocean);
}

/* 标签定位于球体周边 (HKG, TYO, SIN, USA) */
.hub-tag-hkg { top: 62%; left: -6%; }
.hub-tag-tyo { top: 18%; right: -8%; }
.hub-tag-sin { bottom: 8%; right: 10%; }
.hub-tag-usa { top: 38%; right: -12%; }

/* 当页面离开视口时暂停动画 (通过 JS IntersectionObserver 动态挂载) */
.motion-paused,
.motion-paused * {
  animation-play-state: paused !important;
}

/* 无障碍偏好：减少动画设置 */
@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;
  }
  .globe-stage {
    animation: none !important;
  }
  .route-arc {
    animation: none !important;
    stroke-dasharray: none !important;
  }
  .hero-badge-pulse {
    animation: none !important;
  }
}

/* ==========================================================================
   优势板块：开放式社论排版 (Open Editorial Sections)
   ========================================================================== */
.editorial-sections {
  display: flex;
  flex-direction: column;
  gap: 4rem;
}

.editorial-block {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  align-items: start;
  gap: 3.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.editorial-block:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.editorial-meta {
  position: sticky;
  top: 90px;
}

.editorial-num {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-turquoise);
  opacity: 0.8;
  margin-bottom: 0.75rem;
}

.editorial-category {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ocean);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.editorial-heading {
  font-size: 1.85rem;
  color: var(--color-charcoal);
  margin-bottom: 1rem;
}

.editorial-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-charcoal-light);
}

.editorial-body p:last-child {
  margin-bottom: 0;
}

.editorial-points {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px dashed var(--color-border);
}

.editorial-point-item {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.editorial-point-title {
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-charcoal);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.editorial-point-desc {
  font-size: 0.92rem;
  color: var(--color-charcoal-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ==========================================================================
   全球节点网络：区域名录排版 (Regional Directory)
   ========================================================================== */
.directory-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.75rem;
}

.directory-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.directory-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border-light);
}

.directory-code {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ocean);
  background: var(--color-turquoise-soft);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.directory-status {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #2E7D32;
}

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

.directory-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-charcoal);
  margin-bottom: 0.4rem;
}

.directory-type {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-charcoal-muted);
  margin-bottom: 1.25rem;
}

.directory-specs {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
  font-size: 0.88rem;
  color: var(--color-charcoal-light);
}

.directory-specs li {
  display: flex;
  justify-content: space-between;
  padding: 0.35rem 0;
  border-bottom: 1px dashed var(--color-border-light);
}

.directory-specs li:last-child {
  border-bottom: none;
}

.directory-specs span:first-child {
  color: var(--color-charcoal-muted);
}

.directory-specs span:last-child {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-charcoal);
}

.directory-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-charcoal-light);
}

.directory-notice {
  margin-top: 2.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-ocean);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  color: var(--color-charcoal-muted);
}

/* ==========================================================================
   AI 与 流媒体场景：独立宽幅排版 (Separate Wide Layouts)
   ========================================================================== */
.scenario-block {
  margin-bottom: 4.5rem;
}

.scenario-block:last-child {
  margin-bottom: 0;
}

.scenario-banner {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-sm);
}

.scenario-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border-light);
}

.scenario-header-copy {
  max-width: 680px;
}

.scenario-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-ocean);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.scenario-title {
  font-size: 1.85rem;
  color: var(--color-charcoal);
  margin-bottom: 0.5rem;
}

.scenario-desc {
  font-size: 1.05rem;
  color: var(--color-charcoal-muted);
  margin-bottom: 0;
}

/* 场景工具卡片网格 */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.scenario-grid-5 {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
}

.tool-card {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.tool-card:hover {
  background: #FFFFFF;
  border-color: var(--color-turquoise);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.tool-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.tool-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-ocean);
  flex-shrink: 0;
}

.tool-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-charcoal);
}

.tool-scenario {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ocean);
  display: block;
}

.tool-desc {
  font-size: 0.92rem;
  color: var(--color-charcoal-light);
  line-height: 1.6;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.tool-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-charcoal-muted);
  border-top: 1px dashed var(--color-border);
  padding-top: 0.6rem;
}

/* ==========================================================================
   套餐价格对比：SaaS 级别对比表与推荐套餐
   ========================================================================== */
.pricing-notice {
  text-align: center;
  margin-bottom: 2.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-turquoise-soft);
  border: 1px solid rgba(139, 191, 192, 0.4);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  color: var(--color-ocean-dark);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.pricing-card {
  position: relative;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

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

/* 推荐套餐高亮设计 (只有一个推荐套餐) */
.pricing-card.is-featured {
  border: 2px solid var(--color-ocean);
  box-shadow: 0 12px 36px rgba(49, 91, 118, 0.16);
  background: linear-gradient(180deg, #FFFFFF 0%, #F5F9FB 100%);
  transform: scale(1.03);
  z-index: 2;
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-ocean);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.3rem 1.1rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 10px rgba(49, 91, 118, 0.3);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 1.75rem;
}

.pricing-tier-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-charcoal);
  margin-bottom: 0.5rem;
}

.pricing-tier-desc {
  font-size: 0.88rem;
  color: var(--color-charcoal-muted);
  line-height: 1.5;
  margin-bottom: 1.25rem;
  min-height: 40px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

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

.pricing-amount {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-charcoal);
}

.pricing-period {
  font-size: 0.9rem;
  color: var(--color-charcoal-muted);
}

.pricing-tag-editorial {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-charcoal-muted);
  background: var(--color-bg-subtle);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--color-border-light);
}

.pricing-features {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 2rem 0;
  font-size: 0.94rem;
  border-top: 1px solid var(--color-border-light);
  padding-top: 1.25rem;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin-bottom: 0.85rem;
  color: var(--color-charcoal-light);
  line-height: 1.5;
}

.feature-check {
  color: var(--color-ocean);
  font-weight: 700;
  flex-shrink: 0;
}

/* ==========================================================================
   9 篇 SEO 推荐指南卡片 (3 列桌面 / 2 列平板 / 1 列手机)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

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

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

.article-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-ocean);
  background: var(--color-turquoise-soft);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.article-readtime {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-charcoal-muted);
}

.article-card-title {
  font-size: 1.22rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 0.75rem;
}

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

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

.article-card-excerpt {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--color-charcoal-muted);
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-border-light);
}

.article-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-charcoal-muted);
}

.article-more-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-ocean);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.article-more-link:hover {
  color: var(--color-ocean-dark);
}

/* ==========================================================================
   用户评价体验示例 (真实/清晰标记的示例)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.testimonial-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-quote {
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--color-charcoal);
  margin-bottom: 1.5rem;
  font-style: normal;
}

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

.testimonial-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-turquoise-soft);
  color: var(--color-ocean);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid var(--color-turquoise);
  flex-shrink: 0;
}

.testimonial-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-charcoal);
  margin-bottom: 0.15rem;
}

.testimonial-role {
  font-size: 0.82rem;
  color: var(--color-charcoal-muted);
}

.testimonial-disclaimer {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.85rem;
  color: var(--color-charcoal-muted);
}

/* ==========================================================================
   FAQ 常见问题折叠面板 (Accordion)
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

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

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.35rem 1.75rem;
  background: none;
  border: none;
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-charcoal);
  text-align: left;
  cursor: pointer;
  transition: color var(--transition-fast);
}

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

.faq-icon {
  font-size: 1.4rem;
  color: var(--color-ocean);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
  margin-left: 1rem;
}

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

.faq-answer {
  display: none;
  padding: 0 1.75rem 1.5rem 1.75rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-charcoal-light);
  border-top: 1px dashed var(--color-border-light);
  padding-top: 1rem;
}

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

/* ==========================================================================
   Footer 页脚与外链声明矩阵 (PBN 外链)
   ========================================================================== */
.site-footer {
  background-color: var(--color-charcoal);
  color: #CFD8DC;
  padding-top: 4.5rem;
  padding-bottom: 3.5rem;
  font-size: 0.94rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand-title {
  color: var(--color-white);
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.footer-brand-desc {
  color: #B0BEC5;
  font-size: 0.92rem;
  line-height: 1.75;
  max-width: 380px;
  margin-bottom: 1.5rem;
}

.footer-heading {
  color: var(--color-white);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.65rem;
}

.footer-links a {
  color: #B0BEC5;
  transition: color var(--transition-fast);
}

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

/* 外链友链矩阵声明 */
.footer-matrix {
  padding-top: 2.25rem;
  margin-bottom: 2.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-matrix-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-turquoise);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.85rem;
}

.footer-matrix-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.75rem;
}

.matrix-link {
  color: #ECEFF1;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color var(--transition-fast);
}

.matrix-link:hover {
  color: var(--color-turquoise);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: #90A4AE;
}

.footer-legal-links {
  display: flex;
  gap: 1.5rem;
}

.footer-legal-links a {
  color: #90A4AE;
}

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

/* ==========================================================================
   独立文章页与二级页面专用样式 (Article & Subpage Layout)
   ========================================================================== */
.subpage-hero {
  padding: 3.5rem 0 3rem 0;
  background: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb-nav {
  margin-bottom: 1.25rem;
  font-size: 0.88rem;
  color: var(--color-charcoal-muted);
}

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

.breadcrumb-nav span {
  margin: 0 0.4rem;
  color: var(--color-border);
}

.subpage-title {
  font-size: 2.5rem;
  color: var(--color-charcoal);
  margin-bottom: 1rem;
}

.subpage-lead {
  font-size: 1.15rem;
  color: var(--color-charcoal-light);
  line-height: 1.7;
  max-width: 820px;
  margin-bottom: 0;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-charcoal-muted);
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.article-content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 3.5rem;
  padding-top: 3.5rem;
  padding-bottom: 4.5rem;
}

.article-single-col {
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
  padding-top: 3.5rem;
  padding-bottom: 4.5rem;
}

/* 文章正文富文本排版 */
.prose {
  font-size: 1.06rem;
  line-height: 1.85;
  color: var(--color-charcoal);
}

.prose h2 {
  font-size: 1.75rem;
  margin-top: 2.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-charcoal);
}

.prose h3 {
  font-size: 1.35rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--color-ocean);
}

.prose p {
  margin-bottom: 1.5rem;
}

.prose ul, .prose ol {
  margin-bottom: 1.5rem;
  padding-left: 1.75rem;
}

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

.prose blockquote {
  border-left: 4px solid var(--color-ocean);
  background: var(--color-bg-subtle);
  padding: 1.25rem 1.75rem;
  margin: 1.75rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-charcoal-light);
  font-style: normal;
}

.prose .callout-box {
  background: var(--color-turquoise-soft);
  border: 1px solid rgba(139, 191, 192, 0.4);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
}

.prose .callout-box-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ocean-dark);
  margin-bottom: 0.5rem;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.prose th, .prose td {
  padding: 0.85rem 1.15rem;
  border: 1px solid var(--color-border);
  text-align: left;
}

.prose th {
  background: var(--color-bg-subtle);
  font-weight: 700;
  color: var(--color-charcoal);
}

.prose td {
  background: #FFFFFF;
}

.article-cta-box {
  background: linear-gradient(135deg, var(--color-ocean-soft) 0%, var(--color-turquoise-soft) 100%);
  border: 1px solid var(--color-ocean);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  text-align: center;
  margin: 3rem 0;
}

.article-cta-box h3 {
  color: var(--color-ocean-dark);
  margin-top: 0;
  margin-bottom: 0.75rem;
}

/* 侧边栏与相关文章推荐 */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

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

.sidebar-widget-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-charcoal);
  margin-bottom: 1.15rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--color-border);
}

.related-article-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.related-article-item {
  margin-bottom: 1.15rem;
  padding-bottom: 1.15rem;
  border-bottom: 1px dashed var(--color-border-light);
}

.related-article-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.related-article-item a {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-charcoal);
  line-height: 1.45;
  margin-bottom: 0.25rem;
}

.related-article-item a:hover {
  color: var(--color-ocean);
}

.related-article-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-charcoal-muted);
}

/* ==========================================================================
   响应式断点适配规范 (Mobile-First / 375, 390, 430, 768, 1024, 1440px)
   ========================================================================== */

/* 桌面大屏适配 (1200px - 1440px) */
@media (min-width: 1200px) {
  .hero-title {
    font-size: 54px;
  }
}

/* 桌面与横屏平板 (1024px) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3.5rem;
    text-align: center;
  }

  .hero-copy {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-ctas {
    justify-content: center;
  }

  .hero-specs {
    justify-content: center;
  }

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

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

  .scenario-grid-5 {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .pricing-card.is-featured {
    transform: none;
  }

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

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

  .editorial-block {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .editorial-meta {
    position: static;
  }

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

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

/* 平板竖屏与大屏手机 (768px) */
@media (max-width: 768px) {
  .section {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    gap: 1.25rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: none;
  }

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

  .header-cta-desktop {
    display: none;
  }

  .hero-title {
    font-size: 38px;
  }

  .globe-viewport {
    width: 320px;
    height: 320px;
  }

  .hub-tag {
    padding: 0.35rem 0.55rem;
  }

  .hub-tag-hkg { left: -2%; top: 60%; }
  .hub-tag-tyo { right: -2%; top: 15%; }
  .hub-tag-sin { bottom: 4%; right: 5%; }
  .hub-tag-usa { top: 38%; right: -5%; }

  .scenario-banner {
    padding: 1.75rem;
  }

  .scenario-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .scenario-grid-5 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

/* 手机竖屏尺寸适配 (430px / 390px / 375px) */
@media (max-width: 480px) {
  .section {
    padding-top: 3.25rem;
    padding-bottom: 3.25rem;
  }

  .container {
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }

  .hero-title {
    font-size: 35px;
    line-height: 1.2;
  }

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

  .hero-ctas {
    flex-direction: column;
    width: 100%;
  }

  .hero-ctas .btn {
    width: 100%;
  }

  .globe-viewport {
    width: 270px;
    height: 270px;
  }

  .hub-tag-usa, .hub-tag-tyo, .hub-tag-hkg, .hub-tag-sin {
    font-size: 0.72rem;
    padding: 0.25rem 0.45rem;
  }

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

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

  .scenario-grid-5 {
    grid-template-columns: 1fr;
  }

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

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

  .subpage-title {
    font-size: 1.95rem;
  }

  .prose h2 {
    font-size: 1.45rem;
  }

  .prose h3 {
    font-size: 1.2rem;
  }

  .prose table {
    display: block;
    overflow-x: auto;
  }

  .faq-question {
    padding: 1.15rem 1.25rem;
    font-size: 1.02rem;
  }

  .faq-answer {
    padding: 0 1.25rem 1.25rem 1.25rem;
  }
}