/* ==========================================================================
   宝贝云 (BaoBei Cloud) - Tranquil Clear-Sky Mist & Soft-Acrylic UI
   Palette: Pale Sky-Dome White (#f6f9fc), Frosted Cloud-Glass Panels,
   Calm Cerulean Blue (#0284c7), Crisp Midnight-Ink (#0f172a).
   Zero heavy frameworks, blazing fast, seamless day/night transitions.
   ========================================================================== */

:root {
  /* 晴空流云与柔润亚克力白昼配色 (默认白天模式) */
  --bg-sky: #f6f9fc;
  --bg-surface: #ffffff;
  --cloud-acrylic: rgba(255, 255, 255, 0.82);
  --cloud-acrylic-hover: rgba(255, 255, 255, 0.95);
  --cloud-acrylic-solid: #ffffff;
  --acrylic-subtle: rgba(241, 245, 249, 0.7);
  --nav-acrylic: rgba(246, 249, 252, 0.85);

  --silver-mist-border: rgba(203, 213, 225, 0.75);
  --silver-mist-light: rgba(226, 232, 240, 0.8);
  --border-focus: rgba(2, 132, 199, 0.5);

  --midnight-ink: #0f172a;
  --ink-secondary: #334155;
  --ink-muted: #64748b;
  --ink-subtle: #94a3b8;
  --text-inverse: #ffffff;

  /* 蔚蓝平静强调色 */
  --cerulean-primary: #0284c7;
  --cerulean-hover: #0369a1;
  --cerulean-gradient: linear-gradient(135deg, #0284c7 0%, #06b6d4 100%);
  --cerulean-glow: rgba(2, 132, 199, 0.16);
  --cerulean-pill: rgba(2, 132, 199, 0.08);

  --emerald-calm: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.15);
  --amber-soft: #f59e0b;

  --shadow-mist: 0 4px 20px -2px rgba(15, 23, 42, 0.04), 0 2px 8px -2px rgba(15, 23, 42, 0.02);
  --shadow-acrylic: 0 12px 32px -4px rgba(15, 23, 42, 0.06), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
  --shadow-hover: 0 20px 40px -6px rgba(2, 132, 199, 0.12), 0 8px 16px -4px rgba(15, 23, 42, 0.04);

  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.18s ease;
  --transition-glide: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-theme: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

[data-theme="dark"] {
  /* 宁静夜空与幽蓝亚克力夜间配色 (黑夜模式) */
  --bg-sky: #0a0f1d;
  --bg-surface: #0f172a;
  --cloud-acrylic: rgba(15, 23, 42, 0.78);
  --cloud-acrylic-hover: rgba(24, 34, 56, 0.9);
  --cloud-acrylic-solid: #151d30;
  --acrylic-subtle: rgba(255, 255, 255, 0.04);
  --nav-acrylic: rgba(10, 15, 29, 0.88);

  --silver-mist-border: rgba(255, 255, 255, 0.09);
  --silver-mist-light: rgba(255, 255, 255, 0.05);
  --border-focus: rgba(56, 189, 248, 0.55);

  --midnight-ink: #f8fafc;
  --ink-secondary: #cbd5e1;
  --ink-muted: #94a3b8;
  --ink-subtle: #64748b;
  --text-inverse: #0a0f1d;

  --cerulean-primary: #38bdf8;
  --cerulean-hover: #7dd3fc;
  --cerulean-gradient: linear-gradient(135deg, #38bdf8 0%, #22d3ee 100%);
  --cerulean-glow: rgba(56, 189, 248, 0.25);
  --cerulean-pill: rgba(56, 189, 248, 0.12);

  --shadow-mist: 0 4px 20px -2px rgba(0, 0, 0, 0.45);
  --shadow-acrylic: 0 12px 32px -4px rgba(0, 0, 0, 0.6);
  --shadow-hover: 0 20px 40px -6px rgba(56, 189, 248, 0.22);
}

/* 基础重置与平滑锚点过渡 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px; /* 导航栏避让，点击锚点精准对齐板块头部 */
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-sky);
  color: var(--midnight-ink);
  line-height: 1.68;
  transition: var(--transition-theme);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 清晨微雾背景装饰球 */
.bg-mist-layer {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 650px;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.mist-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.22;
  transition: opacity 0.5s ease;
}

[data-theme="dark"] .mist-orb {
  opacity: 0.18;
}

.mist-orb-1 {
  width: 580px;
  height: 580px;
  top: -180px;
  left: 10%;
  background: radial-gradient(circle, #0284c7 0%, #38bdf8 70%, transparent 100%);
}

.mist-orb-2 {
  width: 520px;
  height: 520px;
  top: -120px;
  right: 8%;
  background: radial-gradient(circle, #06b6d4 0%, #0284c7 80%, transparent 100%);
}

/* 页面版心容器 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.94rem;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-glide);
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: var(--cerulean-gradient);
  color: #ffffff !important;
  box-shadow: 0 4px 14px var(--cerulean-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px var(--cerulean-glow);
  filter: brightness(1.05);
}

.btn-acrylic {
  background: var(--cloud-acrylic);
  color: var(--midnight-ink);
  border: 1px solid var(--silver-mist-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-mist);
}

.btn-acrylic:hover {
  background: var(--cloud-acrylic-hover);
  border-color: var(--cerulean-primary);
  color: var(--cerulean-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-acrylic);
}

.btn-lg {
  padding: 13px 30px;
  font-size: 1.02rem;
}

/* ==========================================================================
   页眉 Header 与导航目录
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: var(--nav-acrylic);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--silver-mist-border);
  transition: var(--transition-theme);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.28rem;
  color: var(--midnight-ink);
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-logo-img {
  height: 42px;
  width: auto;
  max-width: 175px;
  object-fit: contain;
  display: block;
  transition: opacity var(--transition-glide), transform var(--transition-glide);
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.03);
}

.logo-for-light {
  display: block;
}

.logo-for-dark {
  display: none;
}

[data-theme="dark"] .logo-for-light {
  display: none;
}

[data-theme="dark"] .logo-for-dark {
  display: block;
}

.brand-title-accent {
  color: var(--cerulean-primary);
  font-weight: 800;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  color: var(--ink-secondary);
  font-weight: 500;
  position: relative;
  padding: 6px 2px;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--cerulean-primary);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--cerulean-primary);
  transition: all var(--transition-fast);
  transform: translateX(-50%);
  border-radius: 2px;
}

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

/* 导航中‘推荐资讯’特别标签 */
.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.nav-tag-pill {
  font-size: 0.68rem;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--cerulean-pill);
  color: var(--cerulean-primary);
  border: 1px solid var(--border-focus);
  font-weight: 600;
  vertical-align: middle;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 专业精巧透明昼夜模式切换按钮 */
.theme-toggle-btn {
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--midnight-ink);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-glide);
}

.theme-toggle-btn:hover {
  background: var(--cloud-acrylic-hover);
  border-color: var(--border-focus);
  transform: scale(1.05);
  box-shadow: 0 2px 10px var(--cerulean-glow);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  stroke-width: 2;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.theme-toggle-btn .icon-moon {
  display: none;
}

.theme-toggle-btn .icon-sun {
  display: block;
}

[data-theme="dark"] .theme-toggle-btn .icon-moon {
  display: block;
}

[data-theme="dark"] .theme-toggle-btn .icon-sun {
  display: none;
}

/* 移动端汉堡按钮 */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--midnight-ink);
  cursor: pointer;
  padding: 6px;
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* ==========================================================================
   Hero 主视觉区
   ========================================================================== */
.hero-section {
  padding: 76px 0 56px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--cloud-acrylic);
  color: var(--cerulean-primary);
  border: 1px solid var(--silver-mist-border);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  font-weight: 600;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-mist);
}

.hero-pill-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald-calm);
  box-shadow: 0 0 8px var(--emerald-calm);
  animation: pulseCalm 2.4s infinite;
}

@keyframes pulseCalm {
  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 7px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.25rem;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
  color: var(--midnight-ink);
}

.hero-title .brand-callout {
  color: var(--cerulean-primary);
  position: relative;
  display: inline-block;
}

.hero-subline {
  display: block;
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--ink-secondary);
  letter-spacing: -0.01em;
  margin-top: 6px;
}

/* 主视觉区业务简介 */
.hero-intro-text {
  font-size: 1.15rem;
  color: var(--ink-secondary);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.72;
  font-weight: 400;
}

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

/* 实时静谧测速亚克力卡片 (微雾掠过悬浮显清微交互) */
.hero-telemetry-acrylic {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 960px;
  margin: 0 auto;
  padding: 22px 24px;
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-acrylic);
}

.telemetry-node-card {
  background: var(--acrylic-subtle);
  border: 1px solid var(--silver-mist-light);
  border-radius: var(--radius-md);
  padding: 16px 14px;
  text-align: left;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-glide);
}

/* 微雾掠过遮罩层 (Quiet mist-clearing micro-interaction) */
.telemetry-node-card .mist-veil {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.45), transparent 85%);
  backdrop-filter: blur(3px);
  opacity: 0.6;
  pointer-events: none;
  transition: opacity 0.4s ease, backdrop-filter 0.4s ease;
}

[data-theme="dark"] .telemetry-node-card .mist-veil {
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.08), transparent 85%);
  opacity: 0.5;
}

.telemetry-node-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-focus);
  background: var(--cloud-acrylic-hover);
  box-shadow: var(--shadow-mist);
}

.telemetry-node-card:hover .mist-veil {
  opacity: 0;
  backdrop-filter: blur(0px);
}

.telemetry-node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--midnight-ink);
}

.node-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--emerald-calm);
}

.telemetry-ping {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--cerulean-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.telemetry-desc {
  font-size: 0.76rem;
  color: var(--ink-muted);
  margin-top: 4px;
}

/* ==========================================================================
   Section 通用标题规范
   ========================================================================== */
.section {
  padding: 84px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cerulean-primary);
  background: var(--cerulean-pill);
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 12px;
  border: 1px solid var(--border-focus);
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--midnight-ink);
}

.section-desc {
  font-size: 1.02rem;
  color: var(--ink-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   产品核心优势 (3个柔润亚克力图文卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-mist);
  transition: all var(--transition-glide);
  display: flex;
  flex-direction: column;
  position: relative;
}

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

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--cerulean-pill);
  color: var(--cerulean-primary);
  border: 1px solid var(--border-focus);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

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

.feature-title {
  font-size: 1.32rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--midnight-ink);
}

.feature-desc {
  font-size: 0.94rem;
  color: var(--ink-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-top: 1px solid var(--silver-mist-light);
  padding-top: 16px;
}

.feature-pill-badge {
  font-size: 0.78rem;
  padding: 3px 10px;
  border-radius: var(--radius-xs);
  background: var(--acrylic-subtle);
  color: var(--ink-secondary);
  border: 1px solid var(--silver-mist-light);
  font-weight: 500;
}

/* ==========================================================================
   流媒体图卡 & AI 支持图卡
   ========================================================================== */
.unlock-wrapper {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.unlock-box {
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-mist);
  transition: all var(--transition-glide);
}

.unlock-box:hover {
  border-color: var(--border-focus);
  transform: translateY(-4px);
  box-shadow: var(--shadow-acrylic);
}

.unlock-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.unlock-header-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--cerulean-pill);
  color: var(--cerulean-primary);
  border: 1px solid var(--border-focus);
}

.unlock-header-icon svg {
  width: 26px;
  height: 26px;
}

.unlock-box-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--midnight-ink);
}

.unlock-box-sub {
  font-size: 0.86rem;
  color: var(--ink-muted);
}

.unlock-desc {
  font-size: 0.94rem;
  color: var(--ink-secondary);
  line-height: 1.68;
  margin-bottom: 24px;
}

.media-grid, .ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.service-card {
  background: var(--bg-surface);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-sm);
  padding: 14px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.service-card:hover {
  border-color: var(--cerulean-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--cerulean-glow);
}

.service-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.service-name {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--midnight-ink);
}

.service-status {
  font-size: 0.74rem;
  color: var(--emerald-calm);
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 500;
}

.service-status::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--emerald-calm);
}

/* ==========================================================================
   套餐价格对比表 (参考真实机场专线定价 + 摩擦力无阻滑轨周期切换)
   ========================================================================== */
.pricing-switch-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 40px;
}

.billing-cycle-switch {
  display: inline-flex;
  position: relative;
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  padding: 4px;
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
}

.cycle-btn {
  position: relative;
  z-index: 2;
  padding: 8px 24px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
  transition: color 0.25s ease;
}

.cycle-btn.active {
  color: var(--midnight-ink);
}

.cycle-glider {
  position: absolute;
  top: 4px;
  left: 4px;
  height: calc(100% - 8px);
  width: 108px;
  background: var(--bg-surface);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-full);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1;
}

[data-theme="dark"] .cycle-glider {
  background: var(--cloud-acrylic-solid);
}

.discount-tag {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: 4px;
}

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

.pricing-card {
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-mist);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-glide);
}

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

.pricing-card.featured {
  border-color: var(--cerulean-primary);
  box-shadow: 0 8px 30px var(--cerulean-glow);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
}

.featured-pill-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--cerulean-gradient);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px var(--cerulean-glow);
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--midnight-ink);
}

.plan-desc {
  font-size: 0.86rem;
  color: var(--ink-muted);
  margin-bottom: 20px;
}

.plan-price-block {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--silver-mist-light);
}

.plan-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--midnight-ink);
}

.plan-price-num {
  font-size: 2.85rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--midnight-ink);
  line-height: 1;
}

.plan-period {
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.plan-features-list {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.91rem;
  color: var(--ink-secondary);
}

.plan-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--cerulean-primary);
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   用户评价 (Testimonials)
   ========================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.testimonial-card {
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-mist);
  transition: all var(--transition-glide);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-acrylic);
}

.testimonial-rating {
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
  color: #f59e0b;
}

.testimonial-rating svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.testimonial-text {
  font-size: 0.93rem;
  color: var(--ink-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  font-style: italic;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--silver-mist-light);
  padding-top: 16px;
}

.user-avatar-tag {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--cerulean-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.user-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--midnight-ink);
}

.user-role {
  font-size: 0.76rem;
  color: var(--ink-muted);
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

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

.faq-question {
  padding: 20px 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--midnight-ink);
  user-select: none;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-toggle-icon {
  width: 20px;
  height: 20px;
  color: var(--ink-muted);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-toggle-icon {
  transform: rotate(180deg);
  color: var(--cerulean-primary);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.93rem;
  color: var(--ink-secondary);
  line-height: 1.72;
}

.faq-item[open] {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-mist);
}

/* 底部 CTA 呼吁横幅 */
.bottom-cta-banner {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.08) 0%, rgba(6, 182, 212, 0.08) 100%);
  border: 1px solid var(--border-focus);
  border-radius: var(--radius-lg);
  padding: 50px 36px;
  text-align: center;
  margin: 40px 0 20px;
  backdrop-filter: blur(12px);
}

.bottom-cta-title {
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.bottom-cta-desc {
  font-size: 1.02rem;
  color: var(--ink-secondary);
  max-width: 620px;
  margin: 0 auto 28px;
}

/* ==========================================================================
   页脚 Footer (严格只保留四个标题，在新页面展示)
   ========================================================================== */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--silver-mist-border);
  padding: 48px 0 32px;
  margin-top: 60px;
  position: relative;
  z-index: 10;
  transition: var(--transition-theme);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink-secondary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--cerulean-primary);
}

.footer-bottom-info {
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.86rem;
  line-height: 1.7;
}

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

/* ==========================================================================
   资讯/子页面文章通用排版
   ========================================================================== */
.subpage-hero {
  padding: 56px 0 36px;
  text-align: center;
}

.subpage-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.subpage-subtitle {
  font-size: 1.08rem;
  color: var(--ink-secondary);
  max-width: 680px;
  margin: 0 auto;
}

.content-box {
  background: var(--cloud-acrylic);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-mist);
  margin-bottom: 40px;
}

.content-section {
  margin-bottom: 34px;
}

.content-section:last-child {
  margin-bottom: 0;
}

.content-heading {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--midnight-ink);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-heading svg {
  width: 22px;
  height: 22px;
  color: var(--cerulean-primary);
}

.content-text {
  font-size: 0.96rem;
  color: var(--ink-secondary);
  line-height: 1.8;
  margin-bottom: 14px;
}

.content-list {
  padding-left: 22px;
  margin-bottom: 14px;
  color: var(--ink-secondary);
  font-size: 0.96rem;
  line-height: 1.8;
}

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

.alert-box {
  background: rgba(239, 68, 68, 0.08);
  border-left: 4px solid #ef4444;
  padding: 16px 20px;
  border-radius: var(--radius-xs);
  color: var(--midnight-ink);
  font-size: 0.94rem;
  line-height: 1.7;
  margin: 18px 0;
}

.alert-box-info {
  background: var(--cerulean-pill);
  border-left: 4px solid var(--cerulean-primary);
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.node-card {
  background: var(--bg-surface);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.node-card-name {
  font-size: 0.96rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--midnight-ink);
}

.node-card-meta {
  font-size: 0.78rem;
  color: var(--ink-muted);
}

/* 推荐资讯卡片网格 */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.news-card {
  background: var(--bg-surface);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  transition: all var(--transition-glide);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-acrylic);
}

.news-date {
  font-size: 0.78rem;
  color: var(--cerulean-primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.news-card-title {
  font-size: 1.18rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--midnight-ink);
}

.news-card-summary {
  font-size: 0.9rem;
  color: var(--ink-secondary);
  line-height: 1.65;
  margin-bottom: 16px;
  flex-grow: 1;
}

/* ==========================================================================
   文章详情页排版 (Article Layout, TOC, Breadcrumb, Related Posts)
   ========================================================================== */
.article-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 0 60px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--ink-muted);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--ink-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--cerulean-primary);
}

.breadcrumb-sep {
  color: var(--ink-subtle);
}

.article-header {
  margin-bottom: 32px;
  text-align: left;
}

.article-main-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--midnight-ink);
  margin: 14px 0 16px;
}

.article-meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.86rem;
  color: var(--ink-muted);
  padding-bottom: 20px;
  border-bottom: 1px solid var(--silver-mist-border);
}

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

/* 文章目录 (Table of Contents) */
.article-toc-box {
  background: var(--acrylic-subtle);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  margin: 28px 0 36px;
  backdrop-filter: blur(8px);
}

.toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--midnight-ink);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.toc-item {
  font-size: 0.94rem;
  line-height: 1.5;
}

.toc-item a {
  color: var(--ink-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.toc-item a:hover {
  color: var(--cerulean-primary);
  transform: translateX(4px);
}

.toc-item a::before {
  content: "•";
  color: var(--cerulean-primary);
  font-weight: bold;
}

/* 正文深度排版 */
.article-body {
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--ink-secondary);
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--midnight-ink);
  margin: 44px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--silver-mist-light);
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--midnight-ink);
  margin: 30px 0 14px;
}

.article-body p {
  margin-bottom: 18px;
}

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

.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 22px;
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.78;
}

.article-body blockquote {
  border-left: 4px solid var(--cerulean-primary);
  background: var(--acrylic-subtle);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--ink-secondary);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 26px 0;
  font-size: 0.92rem;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--silver-mist-border);
}

.article-body th, .article-body td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--silver-mist-border);
}

.article-body th {
  background: var(--acrylic-subtle);
  font-weight: 700;
  color: var(--midnight-ink);
}

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

.article-body a.inline-link {
  color: var(--cerulean-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-body a.inline-link:hover {
  color: var(--cerulean-hover);
}

/* 相关阅读区域 */
.related-posts-section {
  margin-top: 54px;
  padding-top: 36px;
  border-top: 1px solid var(--silver-mist-border);
}

.related-posts-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--midnight-ink);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.related-card {
  background: var(--bg-surface);
  border: 1px solid var(--silver-mist-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.related-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--midnight-ink);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-card-meta {
  font-size: 0.78rem;
  color: var(--ink-muted);
}

/* ==========================================================================
   响应式媒体查询 (@media 移动端优化)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.7rem;
  }
  .hero-subline {
    font-size: 1.7rem;
  }
  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .unlock-wrapper {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .node-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
  .hero-telemetry-acrylic {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-container {
    height: 64px;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    flex-direction: column;
    padding: 18px 24px;
    gap: 14px;
    border-bottom: 1px solid var(--silver-mist-border);
    box-shadow: var(--shadow-acrylic);
  }

  .nav-menu.active {
    display: flex;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .hero-section {
    padding: 44px 0 36px;
  }
  
  .hero-title {
    font-size: 2.1rem;
    line-height: 1.25;
  }
  
  .hero-subline {
    font-size: 1.35rem;
  }

  .hero-intro-text {
    font-size: 0.98rem;
    margin-bottom: 26px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    padding: 13px 20px;
  }
  
  .hero-telemetry-acrylic {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 16px;
  }
  
  .media-grid, .ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .section {
    padding: 56px 0;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .content-box {
    padding: 24px 18px;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  
  .node-grid {
    grid-template-columns: 1fr;
  }
}