/* ==========================================================================
   慈善机场 (cisan.click) - 官方落地页与知识库统一设计系统
   风格基调：深色极客质感 / 赛博科技流光 / 毛玻璃磨砂 / 高级微交互
   ========================================================================== */

:root {
  /* 基础主色板（参考图1与图2） */
  --bg-primary: #070c18;
  --bg-secondary: #0c1427;
  --bg-card: rgba(16, 26, 48, 0.85);
  --bg-card-hover: rgba(22, 35, 64, 0.95);
  --bg-glass: rgba(15, 23, 42, 0.75);
  
  /* 强调色与流光 */
  --accent-cyan: #00d2d3;
  --accent-cyan-glow: rgba(0, 210, 211, 0.35);
  --accent-blue: #1d6ff2;
  --accent-blue-glow: rgba(29, 111, 242, 0.4);
  --accent-purple: #7928ca;
  --accent-gradient: linear-gradient(135deg, #00d2d3 0%, #1d6ff2 50%, #8b5cf6 100%);
  --accent-gold: #f59e0b;

  /* 文字颜色 */
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-highlight: #38bdf8;

  /* 边框与投影 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-card: rgba(56, 189, 248, 0.15);
  --border-active: rgba(0, 210, 211, 0.5);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 25px rgba(0, 210, 211, 0.25);
  --shadow-blue-glow: 0 0 30px rgba(29, 111, 242, 0.35);

  /* 布局与圆角 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 9999px;
  --container-max: 1240px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.65;
  background: radial-gradient(circle at 50% 0%, #111e3b 0%, #070c18 60%);
  background-attachment: fixed;
}

/* 动态背景画布 */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.7;
}

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

/* 链接与排版 */
a {
  color: inherit;
  text-decoration: none;
  transition: all 0.25s ease;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   顶部导航栏 (Navbar)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #fff;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #1d6ff2, #00d2d3);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px var(--accent-cyan-glow);
}

.brand-icon svg {
  width: 22px;
  height: 22px;
  fill: #fff;
}

.brand-badge {
  font-size: 0.68rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: rgba(0, 210, 211, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 210, 211, 0.3);
  margin-left: 6px;
  font-weight: 500;
}

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

.nav-links a {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover, .nav-links a.active {
  color: #fff;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-cyan);
  transition: width 0.3s ease;
  border-radius: 2px;
}

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

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

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: center;
}

.btn-primary {
  background: #1d6ff2;
  color: #fff;
  box-shadow: 0 4px 18px rgba(29, 111, 242, 0.35);
}

.btn-primary:hover {
  background: #2b7af7;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(29, 111, 242, 0.55);
}

.btn-cyan {
  background: var(--accent-cyan);
  color: #051329;
  font-weight: 700;
  box-shadow: 0 4px 18px var(--accent-cyan-glow);
}

.btn-cyan:hover {
  background: #1ce5e6;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 210, 211, 0.5);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

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

/* 移动端汉堡菜单 */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero 首屏视觉区
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 80px 0 60px;
  text-align: center;
  overflow: hidden;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: rgba(29, 111, 242, 0.12);
  border: 1px solid rgba(29, 111, 242, 0.3);
  color: #38bdf8;
  font-size: 0.88rem;
  font-weight: 500;
  margin-bottom: 24px;
  animation: pulse-glow 3s infinite;
}

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

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: #ffffff;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 780px;
  margin: 0 auto 36px;
  font-size: 1.2rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.trust-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.trust-item svg {
  width: 18px;
  height: 18px;
  fill: var(--accent-cyan);
}

/* ==========================================================================
   官网入口 & 节点实时测速监测台 (模拟动态微交互)
   ========================================================================== */
.status-console {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 40px auto;
  max-width: 980px;
  box-shadow: var(--shadow-md);
  position: relative;
  backdrop-filter: blur(12px);
}

.console-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.console-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
}

.console-status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: #10b981;
}

.live-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
  animation: pulse-dot 1.5s infinite;
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.node-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.25s ease;
}

.node-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.node-name {
  font-size: 0.92rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-ping {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-cyan);
  background: rgba(0, 210, 211, 0.1);
  padding: 3px 8px;
  border-radius: 4px;
}

/* ==========================================================================
   核心卖点卡片区
   ========================================================================== */
.section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 54px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-cyan);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #fff;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(29, 111, 242, 0.15);
  border: 1px solid rgba(29, 111, 242, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--accent-cyan);
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: #fff;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================================
   套餐价格 (精准还原图2样式与细节)
   ========================================================================== */
.pricing-section {
  background: linear-gradient(180deg, rgba(7, 12, 24, 0) 0%, rgba(12, 20, 39, 0.7) 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  max-width: 1140px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
}

/* 中间高亮“最受欢迎 旗舰版”卡片（参考图2中央卡片的高亮边框与标签） */
.pricing-card.featured {
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 0 30px rgba(0, 210, 211, 0.22);
  background: rgba(16, 28, 54, 0.95);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-4px);
  box-shadow: 0 0 40px rgba(0, 210, 211, 0.35);
}

.pricing-badge-popular {
  display: inline-block;
  color: var(--accent-cyan);
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.plan-price-wrap {
  margin-bottom: 24px;
}

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

.plan-cycle {
  font-size: 1.3rem;
  font-weight: 500;
  color: #cbd5e1;
}

.plan-yearly-discount {
  margin-top: 8px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.plan-features-list {
  list-style: none;
  margin: 12px 0 32px;
  padding: 0;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  font-size: 0.98rem;
  color: #e2e8f0;
}

.btn-buy {
  width: 100%;
  padding: 13px 20px;
  border-radius: var(--radius-sm);
  background: var(--accent-cyan);
  color: #031326;
  font-size: 1.05rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.25s ease;
  box-shadow: 0 4px 15px rgba(0, 210, 211, 0.3);
}

.btn-buy:hover {
  background: #27ebeb;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 210, 211, 0.5);
}

/* ==========================================================================
   使用教程 Tab 切换区
   ========================================================================== */
.tutorial-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.tab-btn.active, .tab-btn:hover {
  background: var(--accent-blue);
  color: #fff;
  border-color: var(--accent-blue);
  box-shadow: 0 4px 15px var(--accent-blue-glow);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

.tutorial-step-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

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

.step-num {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(0, 210, 211, 0.15);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 16px;
  border: 1px solid rgba(0, 210, 211, 0.3);
}

.step-card h4 {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 10px;
}

.step-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   问题排查网格
   ========================================================================== */
.trouble-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.trouble-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid #ef4444;
  border-radius: var(--radius-md);
  padding: 24px 22px;
}

.trouble-card.warning {
  border-left-color: #f59e0b;
}

.trouble-card.info {
  border-left-color: #3b82f6;
}

.trouble-card h4 {
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.trouble-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.trouble-solution {
  margin-top: 12px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: #e2e8f0;
}

.trouble-solution strong {
  color: var(--accent-cyan);
}

/* ==========================================================================
   FAQ 手风琴
   ========================================================================== */
.faq-list {
  max-width: 880px;
  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 0.25s ease;
}

.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.3);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: color 0.2s ease;
}

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

.faq-icon {
  font-size: 1.3rem;
  transition: transform 0.3s ease;
  color: var(--text-muted);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  color: var(--accent-cyan);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding-bottom: 22px;
}

/* ==========================================================================
   文章专栏列表卡片 (博客 / 知识库)
   ========================================================================== */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

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

.article-body {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

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

.article-tag {
  background: rgba(0, 210, 211, 0.1);
  color: var(--accent-cyan);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}

.article-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.4;
  margin-bottom: 12px;
}

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

.article-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

/* ==========================================================================
   文章详情页专有排版系统 (1500-2300字深度长文阅读友好)
   ========================================================================== */
.article-header {
  padding: 50px 0 35px;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 40px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.article-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  color: #fff;
  margin-bottom: 20px;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.post-meta-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.article-content-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.article-main {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 42px 48px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-main h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: #fff;
  margin: 38px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-main h2::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 24px;
  background: var(--accent-cyan);
  border-radius: 4px;
}

.article-main h3 {
  font-size: 1.35rem;
  font-weight: 600;
  color: #f1f5f9;
  margin: 28px 0 14px;
}

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

.article-main ul, .article-main ol {
  margin: 0 0 24px 24px;
}

.article-main li {
  margin-bottom: 10px;
}

.article-main strong {
  color: #38bdf8;
  font-weight: 600;
}

.article-highlight-box {
  background: rgba(29, 111, 242, 0.08);
  border: 1px solid rgba(29, 111, 242, 0.25);
  border-left: 4px solid var(--accent-cyan);
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  margin: 28px 0;
}

.article-highlight-box h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.article-highlight-box p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(16, 26, 48, 0.95), rgba(12, 20, 39, 0.95));
  border: 2px solid rgba(0, 210, 211, 0.4);
  border-radius: var(--radius-md);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.article-cta-box h3 {
  font-size: 1.6rem;
  color: #fff;
  margin-bottom: 12px;
}

.article-cta-box p {
  max-width: 600px;
  margin: 0 auto 24px;
  color: var(--text-secondary);
}

/* 侧边栏 */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

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

.widget-title {
  font-size: 1.15rem;
  color: #fff;
  font-weight: 700;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.related-post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.related-post-item a {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: block;
}

.related-post-item a:hover {
  color: var(--accent-cyan);
}

/* ==========================================================================
   页脚 Footer
   ========================================================================== */
.site-footer {
  background: #050811;
  border-top: 1px solid var(--border-subtle);
  padding: 70px 0 35px;
  margin-top: 80px;
  font-size: 0.92rem;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-about p {
  color: var(--text-secondary);
  margin-top: 14px;
  line-height: 1.6;
  max-width: 380px;
}

.footer-col h4 {
  color: #fff;
  font-size: 1.05rem;
  margin-bottom: 20px;
  font-weight: 600;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 16px;
}

/* 动效关键帧 */
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 10px rgba(0, 210, 211, 0.1); }
  50% { box-shadow: 0 0 20px rgba(0, 210, 211, 0.35); }
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 响应式断点 */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  .article-content-layout {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.3rem;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #091022;
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-subtle);
    gap: 16px;
  }
  .nav-links.show {
    display: flex;
  }
  .menu-toggle {
    display: block;
  }
  .article-main {
    padding: 28px 20px;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
}