/* ===================================================================
   宝贝云 (baobeiyun.shop) - Tranquil Midnight-Slate & Soft-Moonlight UI
   原生轻量级 CSS | 零重型外部依赖 | 极速秒开 | 昼夜模式
   =================================================================== */

:root {
  /* 白天模式（柔和静谧浅色，非刺眼白） */
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-nav: rgba(248, 250, 252, 0.88);
  --bg-badge: rgba(56, 189, 248, 0.12);
  --bg-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  /* 品牌与点缀色（月光天青柔和色调） */
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --accent-cyan: #38bdf8;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  --accent-gradient-text: linear-gradient(135deg, #0369a1 0%, #0284c7 100%);
  --moonlight-sheen: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(2, 132, 199, 0.08) 0%, transparent 65%);
  --badge-glow: rgba(2, 132, 199, 0.12);

  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 10px -2px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.08);
  --shadow-card: 0 8px 24px -6px rgba(15, 23, 42, 0.06);

  /* 主题切换按钮 */
  --theme-btn-bg: rgba(255, 255, 255, 0.85);
  --theme-btn-border: #cbd5e1;
  --theme-btn-hover: #e2e8f0;

  /* 布局与圆角规范 (UI指示: softly rounded 20px cards) */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s ease;
  --transition-slow: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1220px;
}

/* ===================================================================
   夜间/暗色模式 (Strict Tranquil Midnight-Slate & Soft-Moonlight Palette)
   Deep twilight slate-blue (#11151c)
   Matte dark-cloud cards (#181d26)
   Soft moonlight off-white typography (#f1f5f9)
   Gentle sky-cyan accents (#38bdf8)
   Ultra-faint 1px moonlight-grey borders
   =================================================================== */
[data-theme="dark"] {
  --bg-body: #11151c;
  --bg-card: #181d26;
  --bg-card-hover: #1e2430;
  --bg-nav: rgba(17, 21, 28, 0.88);
  --bg-badge: rgba(56, 189, 248, 0.1);
  --bg-subtle: #141922;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.3);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  --primary: #38bdf8;
  --primary-hover: #7dd3fc;
  --primary-light: rgba(56, 189, 248, 0.15);
  --accent-cyan: #38bdf8;
  --accent-gradient: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  --accent-gradient-text: linear-gradient(135deg, #f1f5f9 0%, #38bdf8 80%);
  --moonlight-sheen: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(56, 189, 248, 0.08) 0%, transparent 65%);
  --badge-glow: rgba(56, 189, 248, 0.2);

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 12px 28px -4px rgba(0, 0, 0, 0.55);
  --shadow-card: 0 10px 30px -8px rgba(0, 0, 0, 0.55);

  --theme-btn-bg: rgba(24, 29, 38, 0.85);
  --theme-btn-border: rgba(255, 255, 255, 0.12);
  --theme-btn-hover: rgba(30, 36, 48, 0.95);
}

/* ===================================================================
   基础重置与排版
   =================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

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

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

/* 渐变文本 */
.text-gradient {
  background: var(--accent-gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* ===================================================================
   顶部导航栏 (Navbar)
   包含首页、每个板块锚点、推荐资讯入口
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

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

.site-logo {
  height: 44px;
  width: auto;
  max-width: 170px;
  object-fit: contain;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.brand-logo:hover .site-logo {
  transform: translateY(-1px);
}

/* 昼夜模式自适应官方 Logo */
.logo-dark {
  display: none;
}

.logo-light {
  display: block;
}

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

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

/* 辅助文本隐藏 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 4px;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-fast);
  border-radius: 2px;
}

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

/* 推荐资讯特殊标牌指示 */
.nav-link-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  display: inline-block;
  box-shadow: 0 0 8px var(--accent-cyan);
}

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

/* 昼夜模式切换按钮 - 精致透明毛玻璃质感 (No harsh emojis) */
.theme-toggle-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--theme-btn-bg);
  border: 1px solid var(--theme-btn-border);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--theme-btn-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
  border-color: var(--border-hover);
}

.theme-toggle-btn svg {
  width: 19px;
  height: 19px;
  transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.theme-toggle-btn .sun-icon {
  position: absolute;
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.theme-toggle-btn .moon-icon {
  position: absolute;
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

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

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

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  background: var(--theme-btn-bg);
  border: 1px solid var(--theme-btn-border);
}

/* ===================================================================
   按钮组件 (CTA规范化: rel="nofollow" target="_blank")
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 11px 24px;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  white-space: nowrap;
  line-height: 1;
  text-align: center;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff !important;
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(56, 189, 248, 0.4);
  opacity: 0.97;
}

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

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.btn-large {
  padding: 14px 32px;
  font-size: 1.05rem;
  border-radius: var(--radius-full);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.88rem;
}

.btn-full {
  width: 100%;
}

/* ===================================================================
   Hero 主视觉区
   大标题必须包含品牌名‘宝贝云’，且主视觉区附带简介
   =================================================================== */
.hero-section {
  position: relative;
  padding: 96px 0 76px;
  text-align: center;
  overflow: hidden;
}

.hero-background-glow {
  position: absolute;
  top: -140px;
  left: 50%;
  transform: translateX(-50%);
  width: 860px;
  height: 520px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.15) 0%, rgba(2, 132, 199, 0.06) 50%, transparent 75%);
  filter: blur(70px);
  z-index: -1;
  pointer-events: none;
}

[data-theme="dark"] .hero-background-glow {
  background: radial-gradient(circle, rgba(56, 189, 248, 0.18) 0%, rgba(14, 165, 233, 0.08) 50%, transparent 75%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  background: var(--bg-badge);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--accent-cyan);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 26px;
  box-shadow: 0 2px 10px var(--badge-glow);
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-cyan);
}

.hero-headline {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 740px;
  margin: 0 auto 38px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 54px;
}

/* 信任指标 / 节点状态条 (UI micro-interaction: soft sky-cyan online dot) */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 980px;
  margin: 0 auto;
  padding: 26px 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
}

.stat-item {
  text-align: center;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -10px;
  top: 15%;
  height: 70%;
  width: 1px;
  background-color: var(--border-color);
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 5px;
  font-weight: 500;
}

.online-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

/* ===================================================================
   通用板块结构
   =================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.26;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.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)
   Softly rounded 20px cards with faint 1px moonlight borders
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
}

/* 微交互：微弱柔和月光微晕效果 (Soft moonlight micro-sheen) */
.feature-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--moonlight-sheen);
  opacity: 0;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

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

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

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  background: var(--bg-badge);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border: 1px solid var(--border-color);
  transition: transform var(--transition-fast);
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.05);
}

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

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

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-highlights {
  border-top: 1px solid var(--border-color);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}

.highlight-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

/* ===================================================================
   流媒体 & AI 支持专区 (双栏对比图卡)
   =================================================================== */
.unlock-showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.unlock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.unlock-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
}

.unlock-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
}

.unlock-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  background: var(--bg-badge);
  color: var(--accent-cyan);
  font-size: 0.82rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
  align-self: flex-start;
  border: 1px solid var(--border-color);
}

.unlock-title {
  font-size: 1.65rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.unlock-desc {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 26px;
}

.service-pills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.service-pill {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.service-pill:hover {
  border-color: var(--border-hover);
  transform: translateY(-1px);
}

.service-pill .pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 6px var(--accent-cyan);
}

.service-features-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--border-color);
}

.service-feature-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.service-feature-row strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===================================================================
   套餐价格对比表 (参考网上真实机场/代理套餐参数)
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

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

.pricing-card.popular {
  border-color: var(--accent-cyan);
  box-shadow: 0 10px 30px -5px rgba(56, 189, 248, 0.2);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #ffffff;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35);
}

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

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.plan-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

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

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

.amount {
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-primary);
}

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

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--accent-cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===================================================================
   用户口碑与评价 (Testimonials)
   =================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
}

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

.stars-rating {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
  font-style: italic;
}

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

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

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

.author-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ===================================================================
   常见问题解答 (FAQ)
   =================================================================== */
.faq-container {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast);
}

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

.faq-question {
  width: 100%;
  padding: 22px 26px;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  background: transparent;
  gap: 16px;
  cursor: pointer;
}

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  padding: 0 26px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 380px;
  padding: 0 26px 24px;
}

/* ===================================================================
   底部行动号召 (CTA Banner)
   =================================================================== */
.cta-banner-section {
  padding: 80px 0;
}

.cta-banner-card {
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(2, 132, 199, 0.3);
}

.cta-banner-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner-title {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: #ffffff;
}

.cta-banner-desc {
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto 34px;
  opacity: 0.94;
  line-height: 1.7;
}

.cta-banner-btn {
  background: #ffffff !important;
  color: #0f172a !important;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 15px 38px;
  border-radius: var(--radius-full);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.cta-banner-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* ===================================================================
   页脚规范区 (严格保持四个链接: 网站地图、关于我们、服务条款、隐私政策)
   =================================================================== */
.site-footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 36px;
  margin-top: auto;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

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

.footer-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: 6px 8px;
}

.footer-link:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===================================================================
   资讯页面 / 子页面排版组件 (Prose & Insights Grid)
   =================================================================== */
.page-hero {
  padding: 64px 0 44px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
}

.page-title {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.page-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin: 0 auto;
}

.page-content-wrapper {
  padding: 64px 0 84px;
}

.prose-container {
  max-width: 880px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-card);
}

.prose-container h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 36px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.prose-container h2:first-of-type {
  margin-top: 0;
}

.prose-container h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 24px;
  margin-bottom: 10px;
}

.prose-container p {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 16px;
}

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

.prose-container li {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 8px;
}

.prose-container ul li {
  list-style-type: disc;
}

.prose-container ol li {
  list-style-type: decimal;
}

.prose-alert {
  padding: 18px 22px;
  border-radius: var(--radius-md);
  margin: 24px 0;
  font-size: 0.94rem;
  line-height: 1.65;
}

.prose-alert.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #b45309;
}

[data-theme="dark"] .prose-alert.alert-warning {
  color: #fcd34d;
}

.prose-alert.alert-info {
  background: var(--bg-badge);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
}

/* 推荐资讯卡片网格 */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 36px;
}

.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

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

.insight-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.insight-tag {
  background: var(--bg-badge);
  color: var(--accent-cyan);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.insight-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.45;
}

.insight-summary {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.insight-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

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

.sitemap-card {
  padding: 26px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.sitemap-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.sitemap-card ul {
  padding-left: 18px;
  margin-bottom: 0;
}

.sitemap-card li a {
  color: var(--accent-cyan);
  font-weight: 500;
}

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

/* ===================================================================
   深度科普长文专属排版 (Article Layout, TOC, Tables, FAQ & Related Reading)
   =================================================================== */
.article-container {
  max-width: 900px;
  margin: 0 auto;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.86rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

.breadcrumb-nav a:hover {
  color: var(--accent-cyan);
}

.breadcrumb-separator {
  color: var(--border-hover);
}

.article-hero {
  padding: 50px 0 36px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 36px;
}

.article-hero-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

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

/* 目录卡片 (Table of Contents) */
.article-toc {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 30px 0 40px;
}

.article-toc-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-list {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-toc-list li {
  list-style-type: decimal;
  font-size: 0.94rem;
}

.article-toc-list li a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.article-toc-list li a:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
}

/* 正文深度排版 */
.article-content {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.8;
}

.article-content h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
  scroll-margin-top: 90px;
}

.article-content h3 {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 30px;
  margin-bottom: 14px;
  scroll-margin-top: 90px;
}

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

.article-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.article-content a.internal-link {
  color: var(--accent-cyan);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-content a.internal-link:hover {
  opacity: 0.85;
}

/* 表格对比组件 */
.article-table-wrapper {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

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

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

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

.article-table tr:hover td {
  background: var(--bg-subtle);
}

/* 结构化 FAQ 板块 */
.article-faq-section {
  margin: 50px 0 40px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.article-faq-title {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.article-faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin-bottom: 16px;
}

.article-faq-card h4 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.article-faq-card p {
  margin-bottom: 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 文末 CTA 推广卡片 */
.article-cta-box {
  background: var(--card-gradient);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  text-align: center;
  margin: 44px 0;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.article-cta-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
}

.article-cta-title {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.article-cta-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 24px;
}

/* 相关阅读模块 (Related Articles) */
.related-articles-section {
  margin-top: 60px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

.related-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.related-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
}

.related-card-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 10px;
  flex-grow: 1;
}

.related-card-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
  
  .article-hero-title {
    font-size: 1.85rem;
  }
}

@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .insights-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-headline {
    font-size: 2.85rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 22px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    box-shadow: var(--shadow-lg);
  }
  
  .nav-menu.open {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
  
  .hero-headline {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    padding: 20px;
  }
  
  .stat-item:nth-child(2)::after {
    display: none;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .unlock-showcase-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .service-pills-grid {
    grid-template-columns: 1fr;
  }
  
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  
  .prose-container {
    padding: 26px 20px;
  }
  
  .cta-banner-card {
    padding: 42px 20px;
  }
  
  .cta-banner-title {
    font-size: 1.85rem;
  }
  
  .btn-large {
    width: 100%;
    min-height: 48px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }

  .footer-nav {
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .hero-headline {
    font-size: 1.85rem;
  }

  .stat-value {
    font-size: 1.5rem;
  }

  .section {
    padding: 65px 0;
  }

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