/* ==========================================================================
   飞鸟云 (feiniao-yun.sbs) - 航空航电 HUD 平流层极速专线界面
   Luxury Avionics HUD · Transcontinental Migratory Airway Canvas
   纯原生 CSS · 零外部框架依赖 · 极致加载与日夜模式
   ========================================================================== */

:root {
  /* 白天模式色彩规范 (高空晴空昼间仪表) */
  --bg-primary: #f4f7fb;
  --bg-secondary: #eef2f8;
  --bg-card: rgba(255, 255, 255, 0.92);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(244, 247, 251, 0.88);
  --bg-hud: rgba(255, 255, 255, 0.85);
  --bg-tag: rgba(14, 116, 144, 0.1);

  --text-primary: #0b1329;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-accent: #0284c7;

  --hud-cyan: #0284c7;
  --hud-emerald: #059669;
  --hud-amber: #d97706;
  --hud-glow: rgba(2, 132, 199, 0.22);
  --hud-grid: rgba(15, 23, 42, 0.05);

  --brand-primary: #0284c7;
  --brand-primary-hover: #0369a1;
  --brand-gradient: linear-gradient(135deg, #0284c7 0%, #2563eb 55%, #4f46e5 100%);
  --brand-gradient-hover: linear-gradient(135deg, #0369a1 0%, #1d4ed8 55%, #4338ca 100%);
  --card-border: rgba(148, 163, 184, 0.35);
  --card-border-hover: rgba(2, 132, 199, 0.6);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.12);
  --shadow-xl: 0 24px 38px -8px rgba(15, 23, 42, 0.15);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.25);

  --nav-blur: blur(14px);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --radius-full: 9999px;

  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-mono: "SF Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

/* 暗色模式色彩规范 (深空平流层黑夜仪表 #070B14) */
[data-theme="dark"] {
  --bg-primary: #070b14;
  --bg-secondary: #0c1220;
  --bg-card: rgba(12, 18, 32, 0.85);
  --bg-card-hover: rgba(17, 26, 46, 0.95);
  --bg-glass: rgba(7, 11, 20, 0.88);
  --bg-hud: rgba(10, 16, 29, 0.86);
  --bg-tag: rgba(56, 189, 248, 0.14);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-accent: #38bdf8;

  --hud-cyan: #38bdf8;
  --hud-emerald: #34d399;
  --hud-amber: #fbbf24;
  --hud-glow: rgba(56, 189, 248, 0.35);
  --hud-grid: rgba(56, 189, 248, 0.07);

  --brand-primary: #38bdf8;
  --brand-primary-hover: #7dd3fc;
  --brand-gradient: linear-gradient(135deg, #0284c7 0%, #38bdf8 50%, #818cf8 100%);
  --brand-gradient-hover: linear-gradient(135deg, #0369a1 0%, #0284c7 50%, #6366f1 100%);
  --card-border: rgba(56, 189, 248, 0.16);
  --card-border-hover: rgba(56, 189, 248, 0.55);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.7);
  --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.85);
  --shadow-xl: 0 24px 44px rgba(0, 0, 0, 0.95);
  --shadow-glow: 0 0 35px rgba(56, 189, 248, 0.28);
}

/* 基础重置与平滑滚动 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

body {
  line-height: 1.6;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

ul, ol {
  list-style: none;
}

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

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

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   顶部航电设备风格导航栏 (Avionics Top Bar)
   ========================================================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-glass);
  backdrop-filter: var(--nav-blur);
  -webkit-backdrop-filter: var(--nav-blur);
  border-bottom: 1px solid var(--card-border);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.32rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.brand-radar-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-tag);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--hud-cyan);
  position: relative;
  overflow: hidden;
}

.brand-radar-icon svg {
  width: 22px;
  height: 22px;
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  background: var(--bg-tag);
  color: var(--hud-cyan);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--card-border);
  letter-spacing: 0.06em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  position: relative;
  padding: 6px 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--hud-cyan);
  transition: width var(--transition-fast);
  box-shadow: 0 0 8px var(--hud-cyan);
}

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

/* 推荐资讯特殊入口微标 */
.nav-link-badge {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  background: rgba(2, 132, 199, 0.15);
  color: var(--hud-cyan);
  border: 1px solid var(--card-border);
  padding: 1px 5px;
  border-radius: 4px;
  margin-left: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 精致通透昼夜模式切换按钮 */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.theme-toggle-btn:hover {
  border-color: var(--card-border-hover);
  color: var(--hud-cyan);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.theme-icon-sun,
.theme-icon-moon {
  width: 20px;
  height: 20px;
  position: absolute;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

.theme-icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}
.theme-icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .theme-icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}
[data-theme="dark"] .theme-icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* 通用按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--brand-gradient);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}

.btn-primary:hover {
  background: var(--brand-gradient-hover);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.55);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-outline {
  border: 1px solid var(--card-border);
  background: var(--bg-card);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--hud-cyan);
  color: var(--hud-cyan);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 13px 30px;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   全景候鸟航道与航电 HUD 主视觉区 (Hero Panoramic Avionics Canvas)
   ========================================================================== */

.hero-avionics-viewport {
  position: relative;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--card-border);
  overflow: hidden;
  padding-top: 40px;
}

.hero-header-box {
  text-align: center;
  max-width: 860px;
  margin: 0 auto 30px;
  position: relative;
  z-index: 2;
}

.hud-callsign-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-hud);
  border: 1px solid var(--card-border);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--hud-cyan);
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.hud-beacon {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--hud-emerald);
  box-shadow: 0 0 10px var(--hud-emerald);
  animation: beaconPulse 2s infinite ease-in-out;
}

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

.hero-main-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 18px;
}

.hero-main-title .gradient-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-overview-intro {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 26px;
}

/* 航电画布视口容器 */
.canvas-hud-container {
  position: relative;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  height: 520px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  cursor: grab;
  user-select: none;
}

.canvas-hud-container:active {
  cursor: grabbing;
}

#airwayCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* 画布顶层仪表状态条 */
.canvas-top-telemetry {
  position: absolute;
  top: 14px;
  left: 18px;
  right: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--hud-cyan);
  z-index: 5;
}

.telemetry-tag {
  background: var(--bg-hud);
  backdrop-filter: blur(8px);
  border: 1px solid var(--card-border);
  padding: 5px 12px;
  border-radius: 4px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 航路点交互雷达悬浮窗 */
.waypoint-radar-card {
  position: absolute;
  z-index: 10;
  background: var(--bg-hud);
  backdrop-filter: blur(12px);
  border: 1px solid var(--hud-cyan);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  box-shadow: 0 0 25px rgba(2, 132, 199, 0.35);
  pointer-events: none;
  display: none;
  transform: translate(-50%, -120%);
  min-width: 220px;
  transition: opacity 0.15s ease;
}

.waypoint-radar-card.active {
  display: block;
}

.radar-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px dashed var(--card-border);
  padding-bottom: 6px;
  margin-bottom: 8px;
}

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

.radar-ping-val {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--hud-emerald);
}

.radar-meta-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* 机舱海拔节流阀推杆 (Altitude-Throttle Slider) */
.hud-throttle-control {
  position: absolute;
  right: 18px;
  top: 60px;
  bottom: 80px;
  width: 68px;
  background: var(--bg-hud);
  backdrop-filter: blur(10px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 6px;
  z-index: 6;
  box-shadow: var(--shadow-md);
}

.throttle-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--hud-cyan);
  writing-mode: vertical-lr;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  text-transform: uppercase;
}

.throttle-slider-track {
  flex-grow: 1;
  width: 8px;
  background: var(--card-border);
  border-radius: 4px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.throttle-fill {
  position: absolute;
  bottom: 0;
  width: 100%;
  background: var(--brand-gradient);
  border-radius: 4px;
  height: 65%;
  transition: height 0.1s ease-out;
}

.throttle-handle {
  position: absolute;
  bottom: calc(65% - 14px);
  width: 38px;
  height: 28px;
  background: var(--bg-card);
  border: 2px solid var(--hud-cyan);
  border-radius: 6px;
  box-shadow: 0 0 12px rgba(2, 132, 199, 0.45);
  cursor: ns-resize;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  transition: bottom 0.1s ease-out;
}

.throttle-grip-bar {
  width: 18px;
  height: 2px;
  background: var(--hud-cyan);
  border-radius: 1px;
}

.throttle-tier-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--hud-cyan);
  margin-top: 8px;
  text-align: center;
}

/* 底部驾驶舱遥测托盘 (Bottom Cockpit HUD Tray) */
.cockpit-hud-tray {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-hud);
  backdrop-filter: blur(14px);
  border-top: 1px solid var(--card-border);
  padding: 12px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  z-index: 5;
}

.hud-tray-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hud-tray-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hud-tray-val {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.hud-tray-val.cyan { color: var(--hud-cyan); }
.hud-tray-val.emerald { color: var(--hud-emerald); }

.hud-tray-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ==========================================================================
   区块通用样式
   ========================================================================== */

.section {
  padding: 85px 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--hud-cyan);
  background: var(--bg-tag);
  border: 1px solid var(--card-border);
  padding: 4px 14px;
  border-radius: 4px;
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   产品核心优势 3 个图文卡片 (Aviation Corridors Features)
   严格遵守规避规则：无 AI 闪烁图标、无魔法棒、无漂浮3D球
   ========================================================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--card-border-hover);
  box-shadow: var(--shadow-lg);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--hud-cyan);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: var(--bg-tag);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--hud-cyan);
  margin-bottom: 22px;
}

.feature-icon-box svg {
  width: 28px;
  height: 28px;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.feature-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 20px;
}

.feature-specs-tray {
  margin-top: auto;
  border-top: 1px dashed var(--card-border);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.feature-spec-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.feature-spec-row svg {
  width: 16px;
  height: 16px;
  color: var(--hud-emerald);
  flex-shrink: 0;
}

/* ==========================================================================
   流媒体 & AI 双展示图卡 (Showcase Cards)
   ========================================================================== */

.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 18px;
  border: 1px solid var(--card-border);
}

.badge-stream {
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
}

.badge-ai {
  background: rgba(14, 165, 233, 0.12);
  color: var(--hud-cyan);
}

.showcase-title {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.showcase-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 24px;
}

.platform-badges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.platform-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  border: 1px solid var(--card-border);
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.platform-item:hover {
  border-color: var(--hud-cyan);
  transform: translateY(-2px);
}

.platform-icon-circle {
  width: 26px;
  height: 26px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 800;
  color: #ffffff;
  flex-shrink: 0;
}

.icon-netflix { background: #E50914; }
.icon-youtube { background: #FF0000; }
.icon-disney { background: #113CCF; }
.icon-hbo { background: #5822B4; }
.icon-spotify { background: #1DB954; }
.icon-prime { background: #00A8E1; }

.icon-chatgpt { background: #10A37F; }
.icon-claude { background: #D97706; }
.icon-midjourney { background: #1E293B; }
.icon-gemini { background: #4285F4; }
.icon-copilot { background: #6E40C9; }
.icon-suno { background: #EC4899; }

.showcase-specs-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.spec-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-tag);
  border: 1px solid var(--card-border);
  padding: 5px 10px;
  border-radius: 4px;
}

/* ==========================================================================
   套餐价格对比表 (真实网络加速器/机场市场对标定价)
   ========================================================================== */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--card-border-hover);
  box-shadow: var(--shadow-xl);
}

.pricing-card.popular {
  border: 2px solid var(--hud-cyan);
  box-shadow: var(--shadow-glow);
  transform: scale(1.02);
}

.pricing-card.popular:hover {
  transform: scale(1.02) translateY(-8px);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--brand-gradient);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.4);
}

.pricing-plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.pricing-plan-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 22px;
  min-height: 42px;
}

.pricing-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--card-border);
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--hud-cyan);
}

.price-amount {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

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

.pricing-features-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  width: 17px;
  height: 17px;
  color: var(--hud-emerald);
  flex-shrink: 0;
}

.pricing-feature-item.muted {
  color: var(--text-muted);
  text-decoration: line-through;
}

.pricing-feature-item.muted svg {
  color: var(--text-muted);
}

/* ==========================================================================
   机长/用户真实评价 (Pilot Logbook Testimonials)
   严格遵守规避规则：无 AI 闪烁图标、用航电 HUD 信号条代替粗糙图标
   ========================================================================== */

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

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

.review-hud-callsign {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--hud-cyan);
}

.review-signal-gauge {
  display: flex;
  gap: 3px;
  align-items: center;
}

.signal-bar {
  width: 4px;
  height: 12px;
  background: var(--hud-emerald);
  border-radius: 1px;
}

.signal-bar.mid { height: 16px; }
.signal-bar.high { height: 20px; }

.review-quote {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 22px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px dashed var(--card-border);
  padding-top: 16px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-tag);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--hud-cyan);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.author-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */

.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  background: transparent;
  cursor: pointer;
  gap: 16px;
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  color: var(--hud-cyan);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-answer p {
  padding-bottom: 20px;
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
}

.faq-item.active .faq-answer {
  max-height: 280px;
}

/* ==========================================================================
   底部行动召唤横幅 (Bottom Avionics CTA Banner)
   ========================================================================== */

.cta-banner {
  background: var(--brand-gradient);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  margin-bottom: 30px;
}

.cta-banner h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.cta-banner p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 660px;
  margin: 0 auto 30px;
}

.cta-banner .btn-white {
  background: #ffffff;
  color: #0369a1;
  font-weight: 700;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
}

.cta-banner .btn-white:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

/* ==========================================================================
   页脚样式 - 严格符合要求：只保留四个标题，在新页面打开
   ========================================================================== */

.footer {
  margin-top: auto;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--card-border);
  padding: 40px 0;
  text-align: center;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  padding: 5px 10px;
  border-radius: 4px;
}

.footer-nav-link:hover {
  color: var(--hud-cyan);
  background: var(--bg-tag);
}

.footer-copyright {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   子页面内容通用框架 (sitemap, about, terms, privacy, insights-8f2a)
   ========================================================================== */

.page-container {
  max-width: 940px;
  margin: 40px auto 80px;
  padding: 0 24px;
}

.page-header {
  margin-bottom: 34px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--card-border);
}

.page-back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--hud-cyan);
  margin-bottom: 14px;
}

.page-back-link:hover {
  text-decoration: underline;
}

.page-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.page-meta {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-muted);
}

.page-content {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 40px 42px;
  box-shadow: var(--shadow-sm);
  color: var(--text-secondary);
  line-height: 1.8;
}

.page-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 32px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--card-border);
}

.page-content h2:first-of-type {
  margin-top: 0;
}

.page-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 20px 0 10px;
}

.page-content p {
  margin-bottom: 16px;
}

.page-content ul, .page-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.page-content ul { list-style: disc; }
.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: 8px; }

.page-alert {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin: 20px 0;
  font-size: 0.95rem;
  border-left: 4px solid;
}

.page-alert.info {
  background: var(--bg-tag);
  border-color: var(--hud-cyan);
  color: var(--text-primary);
}

.page-alert.warning {
  background: rgba(245, 158, 11, 0.12);
  border-color: #f59e0b;
  color: var(--text-primary);
}

/* 推荐资讯子页面专有网格 (Insights Feed) */
.insights-grid {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 24px;
}

.insight-article-card {
  background: var(--bg-primary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  transition: all var(--transition-fast);
}

.insight-article-card:hover {
  border-color: var(--hud-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.insight-tag-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.insight-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--hud-cyan);
  background: var(--bg-tag);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--card-border);
}

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

.insight-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.insight-excerpt {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 14px;
}

.insight-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--card-border);
  padding-top: 12px;
  font-size: 0.88rem;
  color: var(--hud-cyan);
  font-weight: 600;
}

/* 网站地图专有栅格 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 20px;
}

.sitemap-card {
  background: var(--bg-primary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.sitemap-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 0 !important;
  list-style: none !important;
}

.sitemap-list li a {
  color: var(--hud-cyan);
  font-weight: 500;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sitemap-list li a:hover {
  text-decoration: underline;
}

/* 节点展示卡片 (关于我们页面专用) */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 20px 0;
}

.node-card {
  background: var(--bg-primary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
}

.node-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--hud-emerald);
  box-shadow: 0 0 6px var(--hud-emerald);
}

/* ==========================================================================
   长篇深度 SEO 文章专有排版样式 (Article Reading System)
   ========================================================================== */

.article-container {
  max-width: 880px;
  margin: 36px auto 80px;
  padding: 0 24px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.breadcrumbs a:hover {
  text-decoration: underline;
}

.article-header {
  margin-bottom: 30px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--card-border);
}

.article-headline {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--text-muted);
}

.article-author {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  font-weight: 600;
}

.author-pill-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--brand-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
}

/* 文章目录盒 (Table of Contents - TOC) */
.article-toc {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-left: 4px solid var(--hud-cyan);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 28px 0 36px;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 0 !important;
  list-style: none !important;
}

.toc-item a {
  font-size: 0.94rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.toc-item a:hover {
  color: var(--hud-cyan);
  text-decoration: underline;
}

.toc-item.sub {
  padding-left: 20px;
  font-size: 0.88rem;
}

/* 文章正文排版 */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 44px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--card-border);
  position: relative;
}

.article-body h2::before {
  content: '#';
  color: var(--hud-cyan);
  margin-right: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

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

.article-body strong {
  color: var(--text-primary);
  font-weight: 700;
}

.article-body ul, .article-body ol {
  margin: 16px 0 24px;
  padding-left: 26px;
}

.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 10px; }

.article-body a {
  color: var(--hud-cyan);
  text-decoration: underline;
  font-weight: 600;
}

.article-body a:hover {
  color: var(--brand-primary-hover);
}

/* 表格排版 */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 26px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.article-table th {
  background: var(--bg-tag);
  color: var(--text-primary);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 1px solid var(--card-border);
  white-space: nowrap;
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--card-border);
  color: var(--text-secondary);
}

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

.article-table tr:hover td {
  background: rgba(2, 132, 199, 0.04);
}

/* 文中行动号召卡 (In-Article CTA Box) */
.article-cta-box {
  background: var(--brand-gradient);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 30px;
  margin: 40px 0;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.article-cta-box h3 {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: #fff !important;
}

.article-cta-box p {
  font-size: 1rem;
  opacity: 0.92;
  max-width: 620px;
  margin: 0 auto 20px;
}

.article-cta-box .btn-white {
  background: #fff;
  color: #0369a1;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* 文章内置 FAQ 版块 (Article In-Page FAQ) */
.article-faq-section {
  margin: 46px 0 36px;
  padding-top: 24px;
  border-top: 2px solid var(--card-border);
}

.article-faq-section h2 {
  margin-top: 0 !important;
}

.article-faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 20px;
}

.article-faq-item {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.article-faq-item h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-faq-item p {
  margin-bottom: 0 !important;
  font-size: 0.96rem;
  line-height: 1.7;
}

/* 相关阅读版块 (Related Articles Section) */
.related-articles-section {
  margin: 48px 0 20px;
  padding-top: 30px;
  border-top: 1px solid var(--card-border);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 20px;
}

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.related-card:hover {
  border-color: var(--hud-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.related-card-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--hud-cyan);
  margin-bottom: 8px;
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 8px;
}

.related-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 12px;
  flex-grow: 1;
}

.related-card-link {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--hud-cyan);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ==========================================================================
   移动端响应式媒体查询 (Mobile Single Column)
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-main-title {
    font-size: 2.7rem;
  }
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: none;
  }
  .pricing-card.popular:hover {
    transform: translateY(-8px);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* 移动端顶部空间精简 */
  }

  .nav-wrap {
    height: 64px;
  }

  .hero-main-title {
    font-size: 2.1rem;
  }

  .hero-overview-intro {
    font-size: 1rem;
    margin-bottom: 24px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-cta-group .btn {
    width: 100%;
    padding: 14px 20px;
  }

  .canvas-hud-container {
    height: 440px;
  }

  .hud-throttle-control {
    display: none; /* 移动端隐藏高精度竖向推杆，保证触控不误触 */
  }

  .cockpit-hud-tray {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 10px 16px;
  }

  .features-grid,
  .media-ai-grid,
  .pricing-grid,
  .reviews-grid,
  .sitemap-grid,
  .nodes-grid {
    grid-template-columns: 1fr; /* 强制手机端单栏优雅布局 */
  }

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

  .section {
    padding: 55px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .cta-banner {
    padding: 40px 20px;
  }

  .cta-banner h2 {
    font-size: 1.7rem;
  }

  .page-content {
    padding: 24px 20px;
  }

  .page-title {
    font-size: 1.85rem;
  }

  .footer-nav {
    gap: 18px;
  }
}

@media (max-width: 480px) {
  .platform-badges {
    grid-template-columns: 1fr;
  }
  .hero-main-title {
    font-size: 1.75rem;
  }
}