/* ==========================================================================
   红杏出墙 (hongx.homes) 官方落地页主样式表
   设计规范：极简苹果白（商务、稳定、清爽）+ 黑色单线框线体系 (Apple Clean Light + Single-Line Wireframe)
   背景：浅灰 (#f5f5f7) | 所有框架：1px 黑色单线 (#111111)
   指令1: Logo去掉背景放去icon
   指令2: 极简苹果白（商务、稳定、清爽）背景为浅灰
   指令3: H1标题需要带有品牌名
   指令4: H2套餐内容做成动态并排可以滑动的
   指令5: H3文章由上往下 顺序排列可以滑动的 科技感流式面板
   指令6: H4添加用户评价会自动跳转的 右边添加节点测速会自动刷新的
   指令7: H5放常见问题FAQ动态并排
   ========================================================================== */

:root {
  /* 基础色彩系统 (极简苹果白与冷灰) */
  --bg-main: #f5f5f7;
  --bg-card: #ffffff;
  --bg-card-subtle: #fafafc;
  --bg-accent: #f0f0f4;
  --border-line: #111111;
  --border-subtle: rgba(17, 17, 17, 0.15);
  
  /* 文字色彩 */
  --text-primary: #111111;
  --text-secondary: #4a4a52;
  --text-muted: #86868b;
  
  /* 品牌点缀色 (红杏橙红 + 苹果科技蓝 + 稳定绿) */
  --brand-apricot: #ff3b30;
  --brand-apricot-hover: #e02424;
  --brand-orange: #ff5e3a;
  --apple-blue: #0071e3;
  --apple-blue-hover: #0077ed;
  --tech-green: #28a745;
  --tech-cyan: #0284c7;
  --badge-bg: #ffffff;
  
  /* 尺寸与圆角 (遵循精致黑框单线规范) */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;
  
  /* 字体族系 */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, "JetBrains Mono", monospace;
  
  --container-max: 1240px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s 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-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   所有框架都改为黑框单线 (Single-line Black Wireframe System)
   ========================================================================== */
.black-frame {
  border: 1px solid var(--border-line);
  background-color: var(--bg-card);
  box-shadow: none;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.black-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-full);
  background: #ffffff;
  color: var(--text-primary);
}

/* 按钮规范 (单线黑框 + 品牌主辅色) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-line);
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--brand-apricot);
  color: #ffffff;
  border-color: var(--border-line);
}

.btn-primary:hover {
  background-color: var(--brand-apricot-hover);
  color: #ffffff;
}

.btn-dark {
  background-color: #111111;
  color: #ffffff;
  border-color: #111111;
}

.btn-dark:hover {
  background-color: #2a2a2e;
  color: #ffffff;
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--text-primary);
  border-color: var(--border-line);
}

.btn-secondary:hover {
  background-color: #f0f0f4;
}

.btn-sm {
  padding: 7px 16px;
  font-size: 0.85rem;
}

/* ==========================================================================
   顶栏导航 (Navbar)
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(245, 245, 247, 0.95);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-line);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

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

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.1;
}

.brand-domain {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--brand-apricot);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  line-height: 1;
  padding: 6px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background: #ffffff;
}

/* ==========================================================================
   指令3: Hero 首屏区域 (H1 标题带有品牌名)
   ========================================================================== */
.section-hero {
  padding: 64px 0 52px;
  border-bottom: 1px solid var(--border-line);
  background: var(--bg-main);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-brand-badge {
  margin-bottom: 18px;
}

/* 指令3: H1标题带有品牌名 */
.hero-h1 {
  font-size: clamp(2.1rem, 3.8vw, 3.2rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.hero-h1 .brand-highlight {
  color: var(--brand-apricot);
  position: relative;
  display: inline-block;
}

.hero-sub {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 30px;
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.hero-guarantee-row {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

.guarantee-icon {
  color: var(--tech-green);
  font-weight: 700;
}

/* 右侧：架构监控浮窗 (黑框单线苹果极简) */
.hero-card-panel {
  border-radius: var(--radius-md);
  padding: 24px;
}

.panel-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-line);
}

.panel-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pulse-dot {
  width: 9px;
  height: 9px;
  background-color: var(--tech-green);
  border-radius: 50%;
  animation: pulseGlow 1.8s infinite;
}

@keyframes pulseGlow {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
  100% { opacity: 1; transform: scale(1); }
}

.panel-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
}

.live-tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  background: var(--bg-accent);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-full);
}

.mesh-status-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.mesh-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.86rem;
  padding: 8px 12px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background: var(--bg-card-subtle);
}

.mesh-name {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.mesh-flag {
  font-size: 1.1rem;
}

.mesh-metrics {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.latency-good {
  color: var(--tech-green);
  font-weight: 700;
}

.status-badge {
  font-size: 0.7rem;
  padding: 2px 6px;
  border: 1px solid var(--border-line);
  border-radius: 4px;
  background: #ffffff;
}

.panel-footer-metric {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px dashed var(--border-line);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   指令4: H2 套餐内容做成动态并排可以滑动的 (Pricing Horizontal Slider)
   ========================================================================== */
.section-pricing {
  padding: 72px 0 80px;
  border-bottom: 1px solid var(--border-line);
  background: #ffffff;
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 36px;
}

.section-h2 {
  font-size: clamp(1.85rem, 3.2vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.section-sub {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.pricing-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 16px;
}

.billing-tabs {
  display: inline-flex;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background: var(--bg-main);
  padding: 4px;
  gap: 4px;
}

.billing-tab {
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.billing-tab.active {
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-line);
}

.slider-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slider-btn {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background: #ffffff;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.slider-btn:hover {
  background: var(--bg-main);
}

/* 并排横向滑动视口 (Dynamic Horizontal Slider Viewport) */
.pricing-slider-viewport {
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 16px;
  margin: 0 -12px;
  padding-left: 12px;
  padding-right: 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-line) #e5e5e7;
}

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

.pricing-slider-viewport::-webkit-scrollbar-track {
  background: #eeeeef;
  border-radius: 3px;
}

.pricing-slider-viewport::-webkit-scrollbar-thumb {
  background: #111111;
  border-radius: 3px;
}

.pricing-slider-track {
  display: flex;
  gap: 20px;
  width: max-content;
  user-select: none;
}

.plan-card {
  width: 310px;
  min-width: 310px;
  border-radius: var(--radius-md);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  background: #ffffff;
}

.plan-card.featured {
  border-width: 2px;
  border-color: #111111;
  background: #ffffff;
}

.plan-badge-top {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  background: var(--brand-apricot);
  color: #ffffff;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-full);
}

.plan-category {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-family: var(--font-mono);
  margin-bottom: 6px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 2px;
  margin-bottom: 10px;
}

.plan-price-wrap .currency {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.plan-price-wrap .price-amount {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-primary);
  font-family: var(--font-sans);
  letter-spacing: -0.03em;
}

.plan-price-wrap .price-cycle {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-left: 4px;
}

.plan-traffic-highlight {
  display: inline-block;
  padding: 4px 10px;
  background: var(--bg-main);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-line);
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.feature-check {
  color: var(--tech-green);
  font-weight: 800;
  line-height: 1.3;
}

.plan-footer {
  margin-top: auto;
}

.plan-footer .btn {
  width: 100%;
}

/* ==========================================================================
   指令6: H4 添加用户评价会自动跳转的 右边添加节点测速会自动刷新的
   (Live Telemetry & User Reviews Split Module)
   ========================================================================== */
.section-telemetry {
  padding: 72px 0 80px;
  border-bottom: 1px solid var(--border-line);
  background: var(--bg-main);
}

.telemetry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: stretch;
}

/* 左侧：用户评价自动跳转轮播 */
.review-panel {
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.panel-subhead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-line);
}

/* 指令6: H4 标题 */
.panel-title-h4 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}

.review-slider-wrapper {
  position: relative;
  min-height: 180px;
  margin-bottom: 20px;
}

.review-card-item {
  display: none;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.review-card-item.active {
  display: block;
  opacity: 1;
}

.review-stars {
  color: #ff9500;
  font-size: 1.1rem;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

.review-content {
  font-size: 1.02rem;
  line-height: 1.68;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.review-author-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border-line);
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.author-meta {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.review-nav-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.review-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid var(--border-line);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

/* 右侧：节点测速自动刷新控制台 */
.speed-panel {
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
}

.speed-console-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border-line);
}

.speed-refresh-badge {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background: var(--bg-card-subtle);
}

.speed-table-container {
  overflow-x: auto;
  flex: 1;
}

.speed-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.speed-table th {
  padding: 10px 8px;
  border-bottom: 1px solid var(--border-line);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.speed-table td {
  padding: 11px 8px;
  border-bottom: 1px solid rgba(17, 17, 17, 0.1);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-primary);
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.86rem;
}

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

.ping-val {
  color: var(--tech-green);
  font-weight: 700;
}

.speed-val {
  font-weight: 700;
  color: var(--text-primary);
}

.node-status-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 6px;
  border: 1px solid var(--border-line);
  border-radius: 4px;
}

.status-optimal {
  background: #e8f5e9;
  color: #2e7d32;
}

/* ==========================================================================
   指令5: H3 文章由上往下 顺序排列可以滑动的 科技感流式面板
   (Cyber Knowledge Vertical Stream)
   ========================================================================== */
.section-articles {
  padding: 72px 0 80px;
  border-bottom: 1px solid var(--border-line);
  background: #ffffff;
}

/* 科技感 HUD 头部控制条 */
.tech-hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  margin-bottom: 24px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  background: var(--bg-main);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.hud-status-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 纵向可滑动科技感流式文章容器 */
.vertical-stream-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-height: 640px;
  overflow-y: auto;
  padding: 4px 8px 4px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border-line) #eeeeef;
}

.vertical-stream-container::-webkit-scrollbar {
  width: 6px;
}

.vertical-stream-container::-webkit-scrollbar-track {
  background: #eeeeef;
  border-radius: 3px;
}

.vertical-stream-container::-webkit-scrollbar-thumb {
  background: #111111;
  border-radius: 3px;
}

.stream-card {
  display: grid;
  grid-template-columns: 80px 1fr 50px;
  gap: 20px;
  align-items: center;
  border-radius: var(--radius-md);
  padding: 20px 24px;
  text-decoration: none;
  position: relative;
  background: #ffffff;
  transition: all var(--transition-fast);
}

.stream-card:hover {
  background: var(--bg-main);
}

.stream-card:hover .stream-arrow-btn {
  background: #111111;
  color: #ffffff;
  transform: translateX(4px);
}

.stream-index {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-right: 1px dashed var(--border-line);
  padding-right: 16px;
}

.stream-index span:first-child {
  font-size: 1.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  line-height: 1;
  color: var(--text-primary);
}

.stream-index-label {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  margin-top: 4px;
}

.stream-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stream-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
}

.stream-cat-tag {
  font-weight: 700;
  color: var(--brand-apricot);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.stream-time {
  color: var(--text-muted);
}

.stream-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.35;
}

.stream-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.stream-keywords {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.stream-kw-chip {
  font-size: 0.72rem;
  padding: 2px 8px;
  border: 1px solid var(--border-line);
  border-radius: 4px;
  background: #ffffff;
  color: var(--text-secondary);
  font-weight: 500;
}

.stream-action {
  display: flex;
  align-items: center;
  justify-content: center;
}

.stream-arrow-btn {
  width: 38px;
  height: 38px;
  border: 1px solid var(--border-line);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

/* ==========================================================================
   指令7: H5 放常见问题FAQ动态并排 (Dynamic Side-by-Side FAQ Grid)
   ========================================================================== */
.section-faq {
  padding: 72px 0 80px;
  border-bottom: 1px solid var(--border-line);
  background: var(--bg-main);
}

.faq-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 36px;
}

/* 指令7: H5 标题放常见问题 */
.faq-h5-title {
  font-size: clamp(1.85rem, 3vw, 2.3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.faq-dynamic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.faq-card-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #ffffff;
  transition: all var(--transition-fast);
}

.faq-question-btn {
  width: 100%;
  padding: 20px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

.faq-question-btn:hover {
  background-color: var(--bg-card-subtle);
}

.faq-toggle-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-line);
  border-radius: 50%;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--transition-fast);
}

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

.faq-answer-pane {
  display: none;
  padding: 0 22px 22px;
  font-size: 0.92rem;
  line-height: 1.68;
  color: var(--text-secondary);
  border-top: 1px dashed rgba(17, 17, 17, 0.15);
}

.faq-card-item.active .faq-answer-pane {
  display: block;
  padding-top: 16px;
}

/* ==========================================================================
   核心优势矩阵 (Features Grid)
   ========================================================================== */
.section-features {
  padding: 72px 0 80px;
  border-bottom: 1px solid var(--border-line);
  background: #ffffff;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #ffffff;
}

.feature-icon-badge {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--bg-main);
  margin-bottom: 6px;
}

.feature-title {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--text-primary);
}

.feature-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.62;
}

/* ==========================================================================
   底部全宽 CTA 转化条
   ========================================================================== */
.section-cta-banner {
  padding: 64px 0;
  border-bottom: 1px solid var(--border-line);
  background: var(--bg-main);
}

.cta-banner-box {
  border-radius: var(--radius-lg);
  padding: 48px 36px;
  text-align: center;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 860px;
  margin: 0 auto;
}

.cta-banner-box h3 {
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.cta-banner-box p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  max-width: 600px;
}

/* ==========================================================================
   页脚 (Site Footer)
   ========================================================================== */
.site-footer {
  padding: 64px 0 36px;
  background: #ffffff;
  border-top: 1px solid var(--border-line);
}

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

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 360px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 18px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

.footer-links-list a {
  font-size: 0.86rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid rgba(17, 17, 17, 0.15);
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-legal-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

/* ==========================================================================
   响应式断点适配 (Responsive Design)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  
  .telemetry-grid {
    grid-template-columns: 1fr;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta {
    display: none;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .faq-dynamic-grid {
    grid-template-columns: 1fr;
  }
  
  .stream-card {
    grid-template-columns: 60px 1fr 36px;
    gap: 14px;
    padding: 16px;
  }
  
  .stream-index span:first-child {
    font-size: 1.4rem;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}