/* ==========================================================================
   鱼燕云 (YuYanYun) 官方落地页样式表 - 极简苹果白 (商务、稳定、清爽) + 全黑框架构
   域名: yuyanyun.homes
   所有框架均采用黑框 (border: 1.5px solid #111111 / #000000)
   ========================================================================== */

:root {
  /* 苹果白核心色彩变量 */
  --bg-main: #FFFFFF;
  --bg-subtle: #FBFBFD;
  --bg-surface: #F5F5F7;
  --bg-card: #FFFFFF;
  --bg-hover: #F2F2F5;

  /* 文字与高对比色彩系统 */
  --text-primary: #111111;
  --text-secondary: #4A4A52;
  --text-muted: #7C7C85;
  --text-light: #9E9EA7;

  /* 核心强调色与状态色 */
  --accent-blue: #0066FF;
  --accent-blue-hover: #0052CC;
  --accent-blue-subtle: #EBF3FF;
  --accent-green: #10B981;
  --accent-green-subtle: #ECFDF5;
  --accent-amber: #F59E0B;
  --accent-purple: #8B5CF6;

  /* 指令要求：所有框架都改为黑框 */
  --border-black: 1.5px solid #111111;
  --border-black-thick: 2px solid #000000;
  --border-black-thin: 1px solid #222222;
  --border-gray: 1px solid #E5E5EA;

  /* 阴影与微光 */
  --shadow-apple: 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lift: 4px 4px 0px #111111;

  /* 字体系统 (苹果风格无衬线) */
  --font-main: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Plus Jakarta Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, Monaco, monospace;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 全局重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-subtle);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 链接与通用元素 */
a {
  color: inherit;
  text-decoration: none;
  transition: all var(--transition-fast);
}

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

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

/* 容器规范 */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   顶部导航栏 (Apple Minimalist Nav + Black Frame Accent)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: var(--border-black);
  height: 68px;
  display: flex;
  align-items: center;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-logo-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.brand-tag-iepl {
  font-size: 0.68rem;
  background-color: #111111;
  color: #FFFFFF;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

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

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

/* 苹果风格按钮系统（带黑框与实心对比） */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: #111111;
  color: #FFFFFF;
  padding: 10px 22px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: var(--border-black);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  background-color: #000000;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lift);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: #FFFFFF;
  color: #111111;
  padding: 10px 20px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: var(--border-black);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background-color: var(--bg-surface);
  transform: translateY(-1px);
}

.mobile-toggle {
  display: none;
  padding: 6px;
  border-radius: var(--radius-sm);
  border: var(--border-black);
  background: #FFFFFF;
}

/* ==========================================================================
   移动端抽屉
   ========================================================================== */
.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  z-index: 199;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.mobile-drawer-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 82%;
  max-width: 340px;
  background-color: #FFFFFF;
  z-index: 200;
  border-left: var(--border-black-thick);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.mobile-drawer.active {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: var(--border-black);
  margin-bottom: 24px;
}

.drawer-nav-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.drawer-nav-item {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: var(--border-black-thin);
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ==========================================================================
   指令3: HERO 区域与 H1 标题
   ========================================================================== */
.hero-section {
  padding: 72px 0 60px;
  background: radial-gradient(circle at 50% 0%, #FFFFFF 0%, #F5F5F7 100%);
  border-bottom: var(--border-black);
  text-align: center;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: #FFFFFF;
  border: var(--border-black);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
  box-shadow: 2px 2px 0px #111111;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* 指令3: H1 标题带有品牌名 */
.hero-h1 {
  font-size: clamp(2.1rem, 4.8vw, 3.6rem);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.15;
  letter-spacing: -0.035em;
  max-width: 960px;
  margin: 0 auto 20px;
}

.hero-h1 .brand-highlight {
  background: linear-gradient(135deg, #111111 0%, #0066FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-desc {
  font-size: clamp(1rem, 1.3vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 34px;
  font-weight: 400;
  line-height: 1.65;
}

.hero-btn-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-btn-row .btn-primary {
  padding: 14px 34px;
  font-size: 1.05rem;
}

.hero-btn-row .btn-secondary {
  padding: 14px 28px;
  font-size: 1.05rem;
}

/* Hero 特性微型便当盒（全黑框） */
.hero-highlights-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1140px;
  margin: 0 auto;
}

.hero-feature-box {
  background: #FFFFFF;
  border: var(--border-black);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  text-align: left;
  transition: all var(--transition-fast);
}

.hero-feature-box:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.hero-feature-icon {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.hero-feature-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.hero-feature-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ==========================================================================
   章节统一样式
   ========================================================================== */
.section-wrapper {
  padding: 80px 0;
  border-bottom: var(--border-black);
}

.section-tag {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-blue);
  background-color: var(--accent-blue-subtle);
  border: var(--border-black-thin);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
}

.section-head-center {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 44px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  line-height: 1.25;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   指令4: H2 套餐内容做成动态并排可以滑动的 (Horizontal Slider + Black Frame)
   ========================================================================== */
.pricing-section {
  background-color: #FFFFFF;
}

.pricing-tabs-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.pricing-tab-btn {
  padding: 9px 20px;
  border-radius: var(--radius-full);
  border: var(--border-black);
  background: #FFFFFF;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.pricing-tab-btn:hover {
  background-color: var(--bg-surface);
}

.pricing-tab-btn.active {
  background-color: #111111;
  color: #FFFFFF;
  box-shadow: 2px 2px 0px #000000;
}

.pricing-slider-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.slider-indicator-text {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.slider-arrows {
  display: flex;
  gap: 8px;
}

.slider-arrow-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: var(--border-black);
  background: #FFFFFF;
  color: #111111;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  transition: all var(--transition-fast);
}

.slider-arrow-btn:hover {
  background-color: var(--bg-surface);
  transform: scale(1.05);
  box-shadow: 2px 2px 0px #111111;
}

/* 横向滑动容器与并排卡片 */
.pricing-slider-track-wrap {
  position: relative;
  overflow: visible;
  padding: 16px 4px 20px;
}

.pricing-cards-slider {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  overflow-y: visible;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-top: 24px;
  padding-bottom: 24px;
  padding-left: 8px;
  padding-right: 8px;
  margin-top: -12px;
  scrollbar-width: thin;
  scrollbar-color: #111111 #F0F0F2;
}

.pricing-cards-slider::-webkit-scrollbar {
  height: 6px;
}

.pricing-cards-slider::-webkit-scrollbar-track {
  background: #F0F0F2;
  border-radius: var(--radius-full);
}

.pricing-cards-slider::-webkit-scrollbar-thumb {
  background: #111111;
  border-radius: var(--radius-full);
}

/* 套餐卡片：所有框架均为黑框 */
.price-card {
  flex: 0 0 320px;
  scroll-snap-align: start;
  background: #FFFFFF;
  border: var(--border-black);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

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

.price-card.featured {
  border: var(--border-black-thick);
  background: #FFFFFF;
  box-shadow: 4px 4px 0px #111111;
}

.price-card-badge {
  position: absolute;
  top: -14px;
  right: 20px;
  background-color: #111111;
  color: #FFFFFF;
  border: var(--border-black);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  z-index: 10;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
}

.plan-header {
  margin-bottom: 20px;
}

.plan-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  min-height: 38px;
  line-height: 1.45;
}

.plan-price-box {
  margin: 18px 0;
  padding: 14px;
  background-color: var(--bg-surface);
  border: var(--border-black-thin);
  border-radius: var(--radius-md);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-price-currency {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

.plan-price-amount {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  font-family: var(--font-mono);
  line-height: 1;
}

.plan-price-cycle {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-left: 2px;
  line-height: 1;
}

.plan-traffic-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #FFFFFF;
  border: var(--border-black-thin);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 11px;
  margin-bottom: 24px;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.plan-feature-item svg {
  width: 16px;
  height: 16px;
  stroke: var(--accent-green);
  flex-shrink: 0;
  margin-top: 3px;
}

.plan-cta-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-md);
  border: var(--border-black);
  background-color: #111111;
  color: #FFFFFF;
  font-size: 0.94rem;
  font-weight: 700;
  transition: all var(--transition-fast);
}

.plan-cta-btn:hover {
  background-color: #000000;
  box-shadow: 2px 2px 0px #111111;
  transform: translateY(-1px);
}

.price-card.featured .plan-cta-btn {
  background-color: var(--accent-blue);
  border-color: #000000;
}

.price-card.featured .plan-cta-btn:hover {
  background-color: var(--accent-blue-hover);
}

/* ==========================================================================
   指令5: H3 文章由上往下 顺序排列可以滑动的 我不要传统滑块的 我要科技感
   (Cyber Stream Vertical HUD - Smooth Tech Sequence Flow)
   ========================================================================== */
.articles-tech-section {
  background-color: var(--bg-subtle);
  position: relative;
  overflow: hidden;
}

.tech-stream-container {
  border: var(--border-black-thick);
  border-radius: var(--radius-xl);
  background: #FFFFFF;
  box-shadow: 4px 4px 0px #111111;
  padding: 24px;
  position: relative;
}

/* 顶部科技控制栏 (HUD Header) */
.tech-hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: var(--border-black);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.tech-status-cluster {
  display: flex;
  align-items: center;
  gap: 14px;
}

.tech-badge-mode {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  background: #111111;
  color: #FFFFFF;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 6px;
}

.tech-stream-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.stream-ctrl-btn {
  border: var(--border-black);
  background: #FFFFFF;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.stream-ctrl-btn:hover {
  background: var(--bg-surface);
  box-shadow: 1px 1px 0px #111111;
}

/* 科技感纵向滚动视窗 (No default ugly scrollbar, with laser flow indicators) */
.tech-articles-viewport {
  height: 520px;
  overflow-y: hidden;
  position: relative;
  scroll-behavior: smooth;
  cursor: grab;
}

.tech-articles-viewport:active {
  cursor: grabbing;
}

/* 上下微光遮罩，营造深度视界 */
.tech-viewport-mask-top,
.tech-viewport-mask-bottom {
  position: absolute;
  left: 0;
  right: 0;
  height: 38px;
  pointer-events: none;
  z-index: 10;
}

.tech-viewport-mask-top {
  top: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0) 100%);
}

.tech-viewport-mask-bottom {
  bottom: 0;
  background: linear-gradient(0deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0) 100%);
}

.tech-articles-stream-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform 0.4s ease-out;
}

/* 单篇纵向科技感文章卡片（全黑框） */
.tech-article-item {
  background: #FFFFFF;
  border: var(--border-black);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 20px;
  align-items: center;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.tech-article-item:hover {
  background: var(--bg-surface);
  transform: translateX(6px);
  box-shadow: 3px 3px 0px #111111;
}

.tech-article-num-col {
  text-align: center;
  border-right: var(--border-black-thin);
  padding-right: 16px;
}

.article-num-code {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 900;
  color: #111111;
  display: block;
}

.article-category-tag {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
}

.tech-article-body {
  padding-right: 12px;
}

.tech-article-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.tech-article-kw-chip {
  background: var(--accent-blue-subtle);
  border: var(--border-black-thin);
  color: var(--accent-blue);
  padding: 1px 8px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
}

.tech-article-heading {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.35;
}

.tech-article-excerpt {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.tech-article-action-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}

.btn-tech-read {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: var(--border-black);
  background: #111111;
  color: #FFFFFF;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.btn-tech-read:hover {
  background: var(--accent-blue);
  box-shadow: 2px 2px 0px #111111;
}

/* ==========================================================================
   指令6: H4 用户评价会自动跳转 + 右边添加节点测速会自动刷新
   ========================================================================== */
.reviews-telemetry-section {
  background-color: #FFFFFF;
}

.h4-dual-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 32px;
}

/* 左列：用户评价自动跳转卡片 */
.reviews-left-col,
.telemetry-right-col {
  display: flex;
  flex-direction: column;
}

.reviews-carousel-box {
  background: #FFFFFF;
  border: var(--border-black-thick);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  min-height: 440px;
  box-shadow: 4px 4px 0px #111111;
  position: relative;
}

.reviews-top-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  border-bottom: var(--border-black-thin);
  padding-bottom: 14px;
}

.reviews-count-badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-primary);
  background: var(--bg-surface);
  border: var(--border-black-thin);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.review-display-wrap {
  position: relative;
  min-height: 220px;
}

.review-card-slide {
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.review-quote-icon {
  font-size: 2.4rem;
  font-family: Georgia, serif;
  color: #111111;
  line-height: 1;
  margin-bottom: 12px;
}

.review-text-body {
  font-size: 1.05rem;
  color: var(--text-primary);
  line-height: 1.65;
  font-weight: 500;
  margin-bottom: 24px;
}

.review-author-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.review-avatar-box {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: var(--border-black);
  background: var(--bg-surface);
  color: #111111;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.review-author-info {
  display: flex;
  flex-direction: column;
}

.review-author-name {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-primary);
}

.review-author-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.review-jump-indicators {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  border-top: var(--border-black-thin);
  padding-top: 18px;
}

.review-dots-row {
  display: flex;
  gap: 8px;
}

.review-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: var(--border-black-thin);
  background: #E5E5EA;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.review-dot.active {
  background: #111111;
  width: 24px;
  border-radius: var(--radius-full);
}

.review-auto-timer {
  font-size: 0.76rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* 右列：节点测速自动刷新卡片 (Live Telemetry Dashboard) */
.telemetry-board-box {
  background: #FFFFFF;
  border: var(--border-black-thick);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  box-shadow: 4px 4px 0px #111111;
  height: 100%;
}

.telemetry-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  border-bottom: var(--border-black);
  padding-bottom: 14px;
}

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

.telemetry-title-group h3 {
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--text-primary);
}

.telemetry-live-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-green-subtle);
  border: var(--border-black-thin);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--accent-green);
}

.telemetry-refresh-indicator {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.telemetry-refresh-icon {
  animation: spin 6s linear infinite;
}

@keyframes spin {
  100% { transform: rotate(360deg); }
}

/* 测速表格与黑框 */
.telemetry-table-wrap {
  overflow-x: auto;
}

.telemetry-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.telemetry-table th {
  text-align: left;
  padding: 10px 8px;
  font-weight: 700;
  font-size: 0.76rem;
  color: var(--text-muted);
  border-bottom: var(--border-black);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.telemetry-table td {
  padding: 12px 8px;
  border-bottom: var(--border-black-thin);
  vertical-align: middle;
}

.telemetry-table tr:hover {
  background-color: var(--bg-surface);
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--text-primary);
}

.node-flag-emoji {
  font-size: 1.1rem;
}

.node-latency-tag {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-green);
  background: var(--accent-green-subtle);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.node-speed-val {
  font-family: var(--font-mono);
  font-weight: 800;
  color: #111111;
}

.node-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  color: #111111;
  background: #FFFFFF;
  border: var(--border-black-thin);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* ==========================================================================
   指令7: H5 放常见问题 FAQ 动态并排 (Dynamic Side-by-Side FAQ)
   ========================================================================== */
.faq-section {
  background-color: var(--bg-subtle);
}

.faq-dynamic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.faq-card-item {
  background: #FFFFFF;
  border: var(--border-black);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  transition: all var(--transition-fast);
  box-shadow: 2px 2px 0px #111111;
}

.faq-card-item:hover {
  transform: translateY(-2px);
  box-shadow: 4px 4px 0px #111111;
}

.faq-question-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--text-primary);
}

.faq-toggle-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: var(--border-black);
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 800;
  transition: transform var(--transition-fast);
}

.faq-card-item.active .faq-toggle-icon {
  transform: rotate(45deg);
  background: #111111;
  color: #FFFFFF;
}

.faq-answer-pane {
  margin-top: 14px;
  padding-top: 14px;
  border-top: var(--border-black-thin);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   指令8: H6 所有设备都将受到保护的文案 (Device Security Banner)
   ========================================================================== */
.device-security-section {
  background-color: #FFFFFF;
  padding: 80px 0;
  border-bottom: var(--border-black);
}

.device-security-box {
  background: #FFFFFF;
  border: var(--border-black-thick);
  border-radius: var(--radius-xl);
  padding: 48px 36px;
  box-shadow: 4px 4px 0px #111111;
  text-align: center;
}

.device-h6-title {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.3;
}

.device-security-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.65;
}

.device-ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  margin-bottom: 36px;
}

.device-eco-card {
  background: var(--bg-subtle);
  border: var(--border-black);
  border-radius: var(--radius-md);
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-fast);
}

.device-eco-card:hover {
  background: #FFFFFF;
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.device-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: var(--border-black-thin);
  background: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
}

.device-eco-name {
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--text-primary);
}

.device-eco-desc {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.security-protocol-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

.security-tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: var(--border-black-thin);
  background: var(--bg-surface);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* ==========================================================================
   文章详情页样式 (Articles Sub-pages)
   ========================================================================== */
.article-page-header {
  padding: 48px 0 32px;
  background: var(--bg-surface);
  border-bottom: var(--border-black);
}

.article-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.article-breadcrumbs a:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

.article-main-h1 {
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.25;
  margin-bottom: 16px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.84rem;
  color: var(--text-muted);
  padding-bottom: 8px;
}

.article-content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  padding: 48px 0 80px;
}

.article-prose {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #2c2c34;
}

.article-prose h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: #111111;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: var(--border-black);
}

.article-prose h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #111111;
  margin: 28px 0 12px;
}

.article-prose p {
  margin-bottom: 20px;
}

.article-prose ul, .article-prose ol {
  margin: 0 0 24px 24px;
}

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

.article-prose blockquote {
  border-left: 4px solid #111111;
  background: var(--bg-surface);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
}

.article-prose .highlight-box {
  background: #FFFFFF;
  border: var(--border-black);
  border-radius: var(--radius-md);
  padding: 20px;
  margin: 28px 0;
  box-shadow: 3px 3px 0px #111111;
}

.article-sidebar-sticky {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-cta-card {
  background: #FFFFFF;
  border: var(--border-black-thick);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 4px 4px 0px #111111;
  text-align: center;
}

.related-articles-box {
  background: #FFFFFF;
  border: var(--border-black);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: 2px 2px 0px #111111;
}

/* ==========================================================================
   页脚 (Footer with PBN / Sitemap / Legal)
   ========================================================================== */
.site-footer {
  background-color: #FFFFFF;
  border-top: var(--border-black-thick);
  padding: 60px 0 32px;
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.footer-intro-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 360px;
}

.footer-col-head {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.footer-links-list a:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

.footer-bottom-bar {
  border-top: var(--border-black-thin);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* 浮动转化条 */
.floating-action-bar {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(120px);
  z-index: 99;
  background: #FFFFFF;
  border: var(--border-black-thick);
  border-radius: var(--radius-full);
  padding: 8px 12px 8px 20px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.18), 4px 4px 0px #111111;
  display: flex;
  align-items: center;
  gap: 18px;
  transition: transform var(--transition-normal);
}

.floating-action-bar.visible {
  transform: translateX(-50%) translateY(0);
}

.floating-text {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 1080px) {
  .hero-highlights-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .h4-dual-grid {
    grid-template-columns: 1fr;
  }

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

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

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

@media (max-width: 768px) {
  .nav-menu, .nav-actions .btn-secondary {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero-highlights-grid {
    grid-template-columns: 1fr;
  }

  .faq-dynamic-grid {
    grid-template-columns: 1fr;
  }

  .tech-article-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .tech-article-num-col {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-right: none;
    border-bottom: var(--border-black-thin);
    padding-right: 0;
    padding-bottom: 8px;
  }

  .tech-article-action-col {
    align-items: flex-start;
  }

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

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