/* ===================================================================
   良心云 (LiangXin Cloud) - 官方极速网络加速落地页样式
   设计规范：深空炭灰 (Deep Space Charcoal) 现代化极简与科技质感
   特点：纯原生 CSS，零重型框架依赖，秒开性能，移动端全适配
=================================================================== */

:root {
  /* 深空炭灰色彩体系 */
  --bg-darkest: #090b0e;
  --bg-main: #0e1117;
  --bg-card: #151922;
  --bg-card-hover: #1c222e;
  --bg-card-trans: rgba(21, 25, 34, 0.75);

  /* 边框与阴影 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.35);
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.2);
  --shadow-glow-cyan: 0 0 30px rgba(6, 182, 212, 0.25);

  /* 品牌高光色彩（电光青蓝 + 极光绿） */
  --primary-gradient: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  --primary-hover: linear-gradient(135deg, #0ea5e9 0%, #1d4ed8 100%);
  --accent-cyan: #38bdf8;
  --accent-blue: #3b82f6;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;

  /* 文本色彩 */
  --text-main: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-light: #ffffff;

  /* 交互过渡 */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  /* 布局容器 */
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: radial-gradient(circle at 50% 0%, #171d28 0%, var(--bg-main) 65%, var(--bg-darkest) 100%);
  background-attachment: fixed;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 微弱环境背景网格增强科技感 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

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

img,
svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ===================================================================
   导航栏 (Navbar) 与 导航目录
=================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(14, 17, 23, 0.88);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  transition: all var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 20px;
}

/* 导航目录菜单 (Header Navigation Directory) */
.nav-menu-list {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

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

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

.nav-menu-link:hover {
  color: #ffffff;
}

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

/* 可交互的良心云 LOGO */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  background: transparent;
  border: 1px solid transparent;
}

.brand-logo:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-subtle);
  transform: translateY(-1px);
}

.brand-logo:active {
  transform: scale(0.96);
}

.brand-logo.logo-clicked {
  animation: logoPulse 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes logoPulse {
  0% {
    transform: scale(0.95);
    filter: drop-shadow(0 0 0 rgba(56, 189, 248, 0));
  }

  50% {
    transform: scale(1.08);
    filter: drop-shadow(0 0 15px rgba(56, 189, 248, 0.8));
  }

  100% {
    transform: scale(1);
    filter: drop-shadow(0 0 0 rgba(56, 189, 248, 0));
  }
}

.logo-icon-wrap {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(37, 99, 235, 0.25));
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.15);
  transition: all var(--transition-normal);
}

.brand-logo:hover .logo-icon-wrap {
  transform: rotate(-6deg) scale(1.05);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);
}

.logo-text-group {
  display: flex;
  flex-direction: column;
}

.logo-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #ffffff 30%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-sub {
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

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

.nav-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.03);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.6;
    transform: scale(0.85);
  }
}

/* ===================================================================
   按钮通用规范 (CTAs) - 严格保留 dofollow 与 target="_blank"
=================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.5);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.05rem;
}

.btn-block {
  width: 100%;
}

.btn-glow {
  position: relative;
}

.btn-glow::after {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: var(--primary-gradient);
  z-index: -1;
  border-radius: inherit;
  filter: blur(10px);
  opacity: 0.5;
  transition: opacity var(--transition-normal);
}

.btn-glow:hover::after {
  opacity: 0.85;
}

/* ===================================================================
   章节公共定义
=================================================================== */
.section-block {
  padding: 110px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 5px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-light);
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-title .text-gradient {
  background: linear-gradient(135deg, #ffffff 20%, #38bdf8 70%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================================
   第1章：主视觉区 (Hero Section) - 左右分布与动态元素
=================================================================== */
.hero-section {
  padding-top: 150px;
  padding-bottom: 90px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 48px;
  align-items: center;
}

.hero-content-col {
  text-align: left;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
}

.hero-pill-badge span.badge-tag {
  background: var(--primary-gradient);
  color: #fff;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -1.2px;
  line-height: 1.18;
  margin-bottom: 22px;
}

.hero-title .brand-name-tag {
  color: #ffffff;
  display: inline-block;
  position: relative;
}

.hero-title .brand-name-tag::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 6px;
  background: rgba(56, 189, 248, 0.35);
  border-radius: 4px;
  z-index: -1;
}

.hero-title .glow-word {
  background: linear-gradient(135deg, #38bdf8 0%, #60a5fa 50%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  margin-top: 6px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

/* 核心特性数据指示 */
.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 18px 20px;
  background: var(--bg-card-trans);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  backdrop-filter: blur(20px);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  border-right: 1px solid var(--border-subtle);
}

.stat-item:last-child {
  border-right: none;
}

.stat-num {
  font-size: 1.55rem;
  font-weight: 800;
  color: #ffffff;
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.stat-num .stat-unit {
  font-size: 0.88rem;
  color: var(--accent-cyan);
  font-weight: 600;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 3px;
  text-align: center;
}

/* ===================================================================
   主视觉区右侧：动态科技监控图卡 (Hero Dynamic Card)
=================================================================== */
.hero-dynamic-card {
  background: linear-gradient(160deg, rgba(26, 32, 44, 0.95) 0%, rgba(14, 18, 25, 0.98) 100%);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.6), 0 0 30px rgba(56, 189, 248, 0.15);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(20px);
}

.hero-dynamic-card::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -80px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

/* 顶部状态条 */
.dash-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.dash-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--accent-emerald);
  font-weight: 600;
  background: rgba(16, 185, 129, 0.12);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.dash-pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulseGreen 1.5s infinite;
}

.dash-engine-tag {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: monospace;
}

/* 实时速率大仪表 */
.dash-meter-box {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dash-meter-title {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.dash-meter-speed {
  font-size: 2.2rem;
  font-weight: 900;
  color: #ffffff;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, monospace;
}

.dash-meter-speed span.unit {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.dash-meter-speed span.speed-live-tag {
  font-size: 0.72rem;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

/* 动效波形动画图 (SVG Waveform) */
.dash-waveform-box {
  width: 100%;
  height: 60px;
  margin-bottom: 18px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  padding: 6px;
  overflow: hidden;
  position: relative;
}

.dash-waveform-svg {
  width: 100%;
  height: 100%;
}

.wave-line {
  stroke-dasharray: 200;
  stroke-dashoffset: 0;
  animation: waveFlow 4s linear infinite;
}

@keyframes waveFlow {
  0% { stroke-dashoffset: 200; }
  100% { stroke-dashoffset: 0; }
}

/* 节点实时延迟矩阵列表 */
.dash-ping-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dash-ping-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  transition: all var(--transition-fast);
}

.dash-ping-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateX(3px);
}

.dash-node-name {
  font-size: 0.86rem;
  font-weight: 600;
  color: #f1f5f9;
  display: flex;
  align-items: center;
  gap: 8px;
}

.dash-node-stats {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dash-ms-badge {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.12);
  padding: 2px 8px;
  border-radius: 4px;
}

.dash-loss-zero {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ===================================================================
   第2章：产品核心优势 - 细节增强 (Latency Meters & Tech Chips)
=================================================================== */
.feature-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.feature-tech-chip {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(56, 189, 248, 0.25);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.feature-latency-meter {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.meter-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.meter-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow: hidden;
  position: relative;
}

.meter-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--primary-gradient);
}

.meter-fill.green {
  background: linear-gradient(90deg, #10b981, #06b6d4);
  width: 95%;
}

.meter-fill.blue {
  background: linear-gradient(90deg, #3b82f6, #38bdf8);
  width: 98%;
}

.meter-fill.purple {
  background: linear-gradient(90deg, #8b5cf6, #ec4899);
  width: 100%;
}

/* ===================================================================
   第3章：流媒体与 AI 支持图卡 - 官方品牌色与高光增强
=================================================================== */
.unlock-item.brand-netflix:hover {
  border-color: rgba(229, 9, 20, 0.5);
  box-shadow: 0 4px 18px rgba(229, 9, 20, 0.25);
}

.unlock-item.brand-disney:hover {
  border-color: rgba(30, 64, 175, 0.6);
  box-shadow: 0 4px 18px rgba(30, 64, 175, 0.3);
}

.unlock-item.brand-youtube:hover {
  border-color: rgba(239, 68, 68, 0.5);
  box-shadow: 0 4px 18px rgba(239, 68, 68, 0.25);
}

.unlock-item.brand-tiktok:hover {
  border-color: rgba(6, 182, 212, 0.5);
  box-shadow: 0 4px 18px rgba(6, 182, 212, 0.25);
}

.unlock-item.brand-openai:hover {
  border-color: rgba(16, 185, 129, 0.5);
  box-shadow: 0 4px 18px rgba(16, 185, 129, 0.25);
}

.unlock-item.brand-claude:hover {
  border-color: rgba(217, 119, 6, 0.5);
  box-shadow: 0 4px 18px rgba(217, 119, 6, 0.25);
}

.unlock-item.brand-midjourney:hover {
  border-color: rgba(139, 92, 246, 0.5);
  box-shadow: 0 4px 18px rgba(139, 92, 246, 0.25);
}

.unlock-item.brand-gemini:hover {
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 4px 18px rgba(59, 130, 246, 0.25);
}

/* ===================================================================
   SEO 专栏文章图卡板块 (位于价格对比表正下方)
=================================================================== */
.articles-section {
  padding: 100px 0;
  position: relative;
  border-top: 1px solid var(--border-subtle);
}

/* 分类筛选选项卡 */
.articles-filter-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  padding: 8px 20px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.filter-btn.active {
  background: var(--primary-gradient);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
}

/* 文章图卡网格 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-seo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.article-seo-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.article-seo-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), var(--shadow-glow);
}

.article-seo-card:hover::after {
  opacity: 1;
}

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.article-category-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.article-date-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

.article-seo-card:hover .article-card-title {
  color: var(--accent-cyan);
}

.article-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.article-read-link {
  font-size: 0.86rem;
  font-weight: 600;
  color: #cbd5e1;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast);
}

.article-read-link:hover {
  color: var(--accent-cyan);
}

.article-cta-direct {
  font-size: 0.8rem;
  font-weight: 700;
  color: #ffffff;
  background: var(--primary-gradient);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.article-cta-direct:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.5);
  color: #ffffff;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

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

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), var(--shadow-glow);
}

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

.feature-icon-box {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--accent-cyan);
  transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon-box {
  transform: scale(1.1) rotate(-5deg);
  background: var(--primary-gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.feature-highlight-list {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-highlight-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: #e2e8f0;
}

.feature-highlight-list li svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* ===================================================================
   第3章：流媒体与 AI 支持图卡 (Matrix Cards)
=================================================================== */
.unlock-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.unlock-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.unlock-box:hover {
  border-color: var(--border-hover);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
}

.unlock-box-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.unlock-badge-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
}

.unlock-box-header h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
}

.unlock-box-header p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.unlock-tags-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 20px 0;
}

.unlock-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  transition: all var(--transition-fast);
}

.unlock-item:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateX(3px);
}

.unlock-item-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 800;
  color: #ffffff;
  flex-shrink: 0;
}

/* 平台微图标背景 */
.bg-netflix {
  background: #e50914;
}

.bg-disney {
  background: linear-gradient(135deg, #113ccf, #001242);
}

.bg-youtube {
  background: #ff0000;
}

.bg-tiktok {
  background: #000000;
  border: 1px solid #333;
}

.bg-openai {
  background: #10a37f;
}

.bg-claude {
  background: #d97706;
}

.bg-midjourney {
  background: #2e1065;
}

.bg-gemini {
  background: linear-gradient(135deg, #1d4ed8, #9333ea);
}

.unlock-item-info {
  display: flex;
  flex-direction: column;
}

.unlock-item-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: #f1f5f9;
}

.unlock-item-desc {
  font-size: 0.72rem;
  color: var(--accent-emerald);
}

.unlock-footnote {
  margin-top: auto;
  padding-top: 16px;
  font-size: 0.84rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ===================================================================
   第4章：套餐价格对比表 (Pricing Comparison Table)
=================================================================== */
.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(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
}

/* 爆款推荐高光样式 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.85) 0%, rgba(15, 23, 42, 0.95) 100%);
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.25);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-6px);
  box-shadow: 0 0 45px rgba(56, 189, 248, 0.4);
}

.pricing-badge-popular {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gradient);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 1px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.5);
  white-space: nowrap;
}

.pricing-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.plan-subtitle {
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 20px 0 6px 0;
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.price-amount {
  font-size: 2.8rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
}

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

.plan-traffic-highlight {
  display: inline-block;
  font-size: 0.82rem;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-top: 6px;
  font-weight: 600;
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.plan-features-list li.active-feature {
  color: var(--text-main);
  font-weight: 500;
}

.plan-features-list li svg {
  flex-shrink: 0;
}

/* ===================================================================
   第5章：用户真实评价 (Social Proof Testimonials)
=================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.review-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
}

.review-stars {
  color: #fbbf24;
  margin-bottom: 16px;
  display: flex;
  gap: 3px;
}

.review-text {
  font-size: 0.96rem;
  color: #cbd5e1;
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: normal;
}

.review-user-info {
  display: flex;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 18px;
}

.user-avatar-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #1e293b, #334155);
  border: 2px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #38bdf8;
}

.user-details h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #ffffff;
}

.user-details p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===================================================================
   第6章：常见问题解答 (FAQ)
=================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.16);
}

.faq-question {
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  font-weight: 600;
  font-size: 1.05rem;
  color: #f1f5f9;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--accent-cyan);
}

.faq-icon-arrow {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-normal);
  color: var(--text-muted);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  background: rgba(0, 0, 0, 0.15);
}

.faq-answer-inner {
  padding: 0 26px 22px 26px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ===================================================================
   第7章：页脚 (Footer) - 严格保留四大独立页面链接，且支持新标签打开
=================================================================== */
.footer-section {
  background: var(--bg-darkest);
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 40px 0;
  position: relative;
  z-index: 10;
}

.footer-nav-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 30px;
}

/* 严格限定四大标题链接 */
.footer-strict-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
}

.footer-link-item {
  font-size: 1.05rem;
  font-weight: 600;
  color: #cbd5e1;
  position: relative;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-link-item:hover {
  color: var(--accent-cyan);
  background: rgba(255, 255, 255, 0.04);
  transform: translateY(-2px);
}

.footer-link-item::after {
  content: "↗";
  font-size: 0.8rem;
  opacity: 0.5;
  transition: all var(--transition-fast);
}

.footer-link-item:hover::after {
  opacity: 1;
  transform: translate(2px, -2px);
}

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

.footer-disclaimer-note {
  font-size: 0.78rem;
  color: #475569;
  text-align: center;
  max-width: 680px;
  margin-top: 8px;
}

/* ===================================================================
   页脚高级重构与 SEO 增强样式 (Enhanced Footer Styles)
=================================================================== */
.footer-brand-row {
  width: 100%;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 24px;
}

.footer-brand-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 580px;
}

.footer-badges-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.footer-trust-badge {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: #e2e8f0;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.footer-trust-badge:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-2px);
}

.footer-strict-section {
  width: 100%;
  text-align: center;
  margin-bottom: 24px;
}

.footer-section-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-seo-cluster {
  width: 100%;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-cluster-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-cyan);
  white-space: nowrap;
}

.footer-seo-links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-seo-tag {
  font-size: 0.82rem;
  color: #94a3b8;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.footer-seo-tag:hover {
  color: #ffffff;
  border-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  transform: translateY(-1px);
}

.footer-bottom-bar {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

/* ===================================================================
   右侧悬浮导航箭头挂件 (Interactive Section Nav Widget)
=================================================================== */
.floating-section-nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  background: rgba(21, 25, 34, 0.88);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 12px 8px;
  z-index: 99;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
  transition: all var(--transition-normal);
}

.floating-section-nav:hover {
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.6), 0 0 20px rgba(56, 189, 248, 0.2);
}

.nav-arrow-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
}

.nav-arrow-btn:hover {
  background: var(--primary-gradient);
  color: #ffffff;
  border-color: transparent;
  transform: scale(1.12);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.5);
}

.nav-arrow-btn:active,
.nav-arrow-btn.btn-clicked {
  transform: scale(0.84);
  box-shadow: 0 0 24px rgba(56, 189, 248, 0.85);
  background: var(--primary-gradient);
  color: #ffffff;
}

.nav-arrow-btn.btn-disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

/* 章节指示器小圆点 */
.nav-dots-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 6px 0;
}

.nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-dot:hover {
  background: var(--accent-cyan);
  transform: scale(1.3);
}

.nav-dot.active {
  background: var(--accent-cyan);
  height: 18px;
  border-radius: 6px;
  box-shadow: 0 0 10px var(--accent-cyan);
}

/* 悬浮提示 Tooltip */
.nav-dot::before {
  content: attr(data-label);
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%) scale(0.8);
  background: #1e293b;
  color: #f8fafc;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.nav-dot:hover::before {
  opacity: 1;
  transform: translateY(-50%) scale(1);
}

/* ===================================================================
   响应式适配 (Media Queries 移动端优先与精细优化)
=================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .hero-content-col {
    text-align: center;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .nav-menu-list {
    display: none; /* 平板与移动端精简顶部导航目录 */
  }

  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.featured {
    transform: none;
  }

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

@media (max-width: 768px) {
  .container {
    padding: 0 18px;
  }

  .navbar {
    height: 64px;
  }

  .nav-status {
    display: none;
    /* 移动端精简顶部 */
  }

  .hero-section {
    padding-top: 110px;
    padding-bottom: 60px;
  }

  .hero-title {
    font-size: 2.1rem;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 1.02rem;
    margin-bottom: 26px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 14px;
  }

  .hero-cta-group .btn {
    width: 100%;
    padding: 16px;
    font-size: 1.05rem;
  }

  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px;
  }

  .stat-item:nth-child(2) {
    border-right: none;
  }

  .section-block {
    padding: 70px 0;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .features-grid,
  .unlock-wrapper,
  .pricing-grid,
  .reviews-grid,
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .unlock-tags-grid {
    grid-template-columns: 1fr;
  }

  .footer-strict-links {
    flex-direction: column;
    gap: 16px;
    width: 100%;
  }

  .footer-brand-row {
    grid-template-columns: 1fr;
    gap: 24px;
    text-align: center;
  }

  .footer-brand-desc {
    margin: 0 auto;
  }

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

  .footer-seo-cluster {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-link-item {
    width: 100%;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    padding: 12px;
  }

  /* 移动端悬浮导航靠右侧微调，不遮挡主体内容 */
  .floating-section-nav {
    right: 12px;
    padding: 8px 6px;
    gap: 8px;
  }

  .nav-arrow-btn {
    width: 36px;
    height: 36px;
  }

  .nav-dot::before {
    display: none;
    /* 移动端取消 hover tooltip 避免遮挡 */
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.9rem;
  }

  .hero-stats-bar {
    grid-template-columns: 1fr 1fr;
    padding: 14px;
  }

  .stat-num {
    font-size: 1.45rem;
  }
}