/* ==========================================================================
   瞬云机场 (shunyun.sbs) 官方视觉系统 2.0
   设计主题：量子星云 · 幻紫流金 (Quantum Nebula & Obsidian Violet)
   适用范围：官网核心落地页、8大原创出海知识专栏、全端自适应
   ========================================================================== */

:root {
  --bg-deep: #06040c;
  --bg-card: rgba(18, 13, 36, 0.75);
  --bg-card-hover: rgba(28, 20, 54, 0.88);
  --bg-card-glow: rgba(139, 92, 246, 0.08);
  --bg-input: #0e0a1f;
  --bg-code: #130d2a;
  
  --primary-purple: #8b5cf6;
  --primary-violet: #a855f7;
  --primary-light-violet: #c084fc;
  --accent-amber: #f59e0b;
  --accent-gold: #fbbf24;
  --accent-rose: #f43f5e;
  --accent-emerald: #10b981;
  --accent-cyan: #06b6d4;

  --text-white: #ffffff;
  --text-main: #f8fafc;
  --text-sub: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dimmer: #64748b;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-violet: rgba(168, 85, 247, 0.28);
  --border-violet-glow: rgba(192, 132, 252, 0.55);
  --border-amber-glow: rgba(245, 158, 11, 0.45);

  --grad-primary: linear-gradient(135deg, #a855f7 0%, #8b5cf6 50%, #6366f1 100%);
  --grad-amber: linear-gradient(135deg, #f59e0b 0%, #ec4899 100%);
  --grad-hero: radial-gradient(circle at 50% -10%, rgba(139, 92, 246, 0.22) 0%, rgba(245, 158, 11, 0.08) 35%, rgba(6, 4, 12, 1) 80%);
  --grad-card: linear-gradient(180deg, rgba(28, 20, 54, 0.6) 0%, rgba(14, 10, 28, 0.85) 100%);

  --shadow-card: 0 16px 36px -10px rgba(0, 0, 0, 0.7), 0 0 24px -6px rgba(139, 92, 246, 0.12);
  --shadow-hover: 0 24px 48px -12px rgba(0, 0, 0, 0.85), 0 0 36px -4px rgba(168, 85, 247, 0.3);
  --shadow-btn: 0 6px 24px rgba(139, 92, 246, 0.4);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-xl: 22px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-deep);
  color: var(--text-main);
  line-height: 1.68;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  background-color: var(--bg-deep);
  background-image: 
    linear-gradient(180deg, rgba(6, 4, 12, 0.78) 0%, rgba(6, 4, 12, 0.88) 40%, rgba(6, 4, 12, 0.98) 100%),
    url('../images/lightning-nebula.jpg');
  background-size: cover;
  background-position: center top;
  background-attachment: fixed;
  background-repeat: no-repeat;
  min-height: 100vh;
  position: relative;
}

/* 背景星云与微电弧装饰点 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(1.5px 1.5px at 20% 30%, rgba(192, 132, 252, 0.4) 50%, transparent 100%),
    radial-gradient(1px 1px at 70% 20%, rgba(245, 158, 11, 0.35) 50%, transparent 100%),
    radial-gradient(1.5px 1.5px at 85% 70%, rgba(139, 92, 246, 0.3) 50%, transparent 100%),
    radial-gradient(1px 1px at 15% 80%, rgba(245, 158, 11, 0.25) 50%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* 链接样式 */
a {
  color: var(--primary-light-violet);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent-gold);
}

ul, ol {
  list-style: none;
}

img, svg {
  max-width: 100%;
  vertical-align: middle;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.section-padding {
  padding: 90px 0;
}

/* 通用玻璃拟态面板 */
.glass-panel {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-violet);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.glass-panel:hover {
  border-color: var(--border-violet-glow);
  box-shadow: var(--shadow-hover);
}

/* 渐变艺术文字 */
.text-gradient {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-gradient-amber {
  background: var(--grad-amber);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.96rem;
  padding: 12px 26px;
  border-radius: 9999px;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--grad-primary);
  color: var(--text-white);
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(139, 92, 246, 0.55);
  color: var(--text-white);
}

.btn-secondary {
  background: rgba(139, 92, 246, 0.12);
  color: var(--text-main);
  border: 1px solid var(--border-violet);
}

.btn-secondary:hover {
  background: rgba(139, 92, 246, 0.24);
  border-color: var(--border-violet-glow);
  color: var(--text-white);
  transform: translateY(-2px);
}

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

/* 顶部悬浮导航栏 */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(6, 4, 12, 0.85);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 0;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.32rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-white);
}

.brand-logo img {
  width: 38px;
  height: 38px;
}

.brand-logo span {
  background: linear-gradient(135deg, #ffffff 0%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-menu a {
  color: var(--text-sub);
  font-size: 0.94rem;
  font-weight: 500;
  padding: 6px 0;
  position: relative;
}

.nav-menu a:hover {
  color: var(--text-white);
}

.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary-violet);
  transition: var(--transition);
}

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

.nav-cta-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-subtle);
  color: var(--text-white);
  font-size: 1.4rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.hero-section {
  position: relative;
  padding: 80px 0 60px 0;
}

.hero-section::after {
  content: "";
  position: absolute;
  top: -40px;
  right: -5%;
  width: 620px;
  height: 500px;
  background-image: radial-gradient(circle at 65% 35%, rgba(139, 92, 246, 0.3) 0%, transparent 70%), url('../images/lightning-hero.jpg');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: top right;
  opacity: 0.42;
  mix-blend-mode: screen;
  pointer-events: none;
  z-index: 0;
  filter: drop-shadow(0 0 25px rgba(168, 85, 247, 0.4));
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(139, 92, 246, 0.12);
  border: 1px solid var(--border-violet);
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 0.85rem;
  color: var(--primary-light-violet);
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-amber);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-amber);
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.2); }
  100% { opacity: 0.4; transform: scale(0.9); }
}

.hero-title {
  font-size: 3.1rem;
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-white);
}

.hero-subtitle {
  font-size: 1.08rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 34px;
}

.hero-subtitle strong {
  color: var(--text-white);
  font-weight: 700;
}

.hero-cta-box {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.stat-item .stat-num {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: -0.02em;
}

.stat-item .stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ==========================================================================
   全新交互组件：全球链路测速罗盘 (Telemetry Compass)
   ========================================================================== */
.telemetry-card {
  padding: 28px;
  background: var(--grad-card);
  border: 1px solid var(--border-violet);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.telemetry-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.telemetry-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.telemetry-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-white);
}

.telemetry-badge {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 9999px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 测速节点列表 */
.telemetry-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  background: rgba(10, 7, 22, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.node-item:hover {
  border-color: var(--border-violet);
  background: rgba(20, 14, 42, 0.8);
  transform: translateX(4px);
}

.node-main {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.node-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-white);
}

.node-route {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-metrics {
  text-align: right;
  min-width: 105px;
}

.node-ping-val {
  font-family: Consolas, Monaco, "Courier New", monospace;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-emerald);
}

.node-jitter {
  font-size: 0.74rem;
  color: var(--text-dimmer);
}

.node-bar-wrap {
  width: 100%;
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 9999px;
  margin-top: 4px;
  overflow: hidden;
}

.node-bar-fill {
  height: 100%;
  background: var(--grad-primary);
  border-radius: 9999px;
  transition: width 0.4s ease;
}

.telemetry-action {
  margin-top: 18px;
}

/* ==========================================================================
   模块通用标题区
   ========================================================================== */
.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 54px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-gold);
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid var(--border-amber-glow);
  padding: 4px 14px;
  border-radius: 9999px;
  margin-bottom: 14px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-white);
  margin-bottom: 16px;
  line-height: 1.25;
}

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

/* ==========================================================================
   四维核心技术矩阵 (Bento Grid)
   ========================================================================== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.bento-card {
  padding: 34px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.bento-card.span-2 {
  grid-column: span 2;
}

.bento-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(139, 92, 246, 0.14);
  border: 1px solid var(--border-violet);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 22px;
  color: var(--primary-light-violet);
}

.bento-card h3 {
  font-size: 1.24rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 12px;
  line-height: 1.4;
}

.bento-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.72;
}

/* ==========================================================================
   资费价格矩阵 (Pricing)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.pricing-card {
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.pricing-card.popular {
  border-color: var(--accent-gold);
  background: radial-gradient(circle at 50% 0%, rgba(245, 158, 11, 0.12) 0%, rgba(18, 13, 36, 0.9) 75%);
  box-shadow: 0 16px 40px -10px rgba(0, 0, 0, 0.8), 0 0 30px -5px rgba(245, 158, 11, 0.25);
  transform: translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--grad-amber);
  color: #000;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 3px 14px;
  border-radius: 9999px;
  white-space: nowrap;
  letter-spacing: 0.04em;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

.plan-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 6px;
}

.plan-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  min-height: 38px;
  line-height: 1.45;
  margin-bottom: 20px;
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  gap: 2px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.price-currency {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.price-num {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-white);
  letter-spacing: -0.03em;
  line-height: 1;
}

.price-period {
  font-size: 0.85rem;
  color: var(--text-dimmer);
  margin-left: 4px;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.86rem;
  color: var(--text-sub);
}

.feature-item .icon {
  color: var(--accent-emerald);
  font-weight: bold;
}

/* ==========================================================================
   客户端生态 (Clients)
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  padding: 28px 22px;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.client-icon {
  font-size: 2.4rem;
  margin-bottom: 14px;
}

.client-name {
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 4px;
}

.client-os {
  font-size: 0.82rem;
  color: var(--accent-gold);
  margin-bottom: 12px;
}

.client-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 18px;
}

/* ==========================================================================
   技术专栏网格 (Articles)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.article-card {
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-dimmer);
  margin-bottom: 12px;
}

.article-tag {
  background: rgba(139, 92, 246, 0.16);
  color: var(--primary-light-violet);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.article-title {
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.48;
  color: var(--text-white);
  margin-bottom: 10px;
}

.article-title a {
  color: var(--text-white);
}

.article-title a:hover {
  color: var(--primary-light-violet);
}

.article-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.article-link:hover {
  gap: 10px;
  color: var(--text-white);
}

/* ==========================================================================
   用户口碑评价 (Reviews)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  color: var(--accent-gold);
  font-size: 1.05rem;
  margin-bottom: 14px;
  letter-spacing: 2px;
}

.review-content {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.72;
  margin-bottom: 22px;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: var(--text-white);
  box-shadow: 0 4px 12px rgba(139, 92, 246, 0.35);
}

.user-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-white);
}

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

/* ==========================================================================
   常见技术 FAQ (Accordion)
   ========================================================================== */
.faq-grid {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

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

.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-white);
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--accent-gold);
  transition: transform 0.3s ease;
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.75;
  transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.active .faq-answer {
  padding: 0 24px 22px 24px;
  max-height: 300px;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* ==========================================================================
   文章详情页排版
   ========================================================================== */
.article-page {
  padding: 50px 0 80px 0;
}

.article-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px;
}

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

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

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

.article-header-title {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.3;
  color: var(--text-white);
  margin-bottom: 18px;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.84rem;
  color: var(--text-muted);
  padding-bottom: 24px;
  margin-bottom: 34px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-body {
  font-size: 1.02rem;
  color: var(--text-sub);
  line-height: 1.85;
}

.article-body p {
  margin-bottom: 22px;
}

.article-body h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--text-white);
  margin: 44px 0 18px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-body h3 {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--accent-gold);
  margin: 28px 0 14px 0;
}

.article-body ul, .article-body ol {
  margin: 0 0 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-body ul {
  list-style: disc;
}

.article-body ol {
  list-style: decimal;
}

.article-body li {
  line-height: 1.75;
}

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

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  font-size: 0.92rem;
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.article-body th, .article-body td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.article-body th {
  background: rgba(139, 92, 246, 0.15);
  color: var(--primary-light-violet);
  font-weight: 700;
}

.article-body tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

.article-cta-box {
  position: relative;
  overflow: hidden;
  padding: 38px 24px;
  margin: 44px 0;
  text-align: center;
  background: 
    linear-gradient(180deg, rgba(18, 13, 36, 0.86) 0%, rgba(10, 7, 22, 0.94) 100%),
    url('../images/lightning-hero.jpg');
  background-size: cover;
  background-position: center;
  border: 1px solid var(--border-violet-glow);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 30px rgba(139, 92, 246, 0.22);
}

.article-cta-box h3 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 12px;
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 24px auto;
  font-size: 0.95rem;
}

.related-articles {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.related-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 22px;
}

/* ==========================================================================
   页脚规范 (严格满足核心任务 2 PBN 权重通道)
   ========================================================================== */
footer {
  background: #04020a;
  border-top: 1px solid var(--border-subtle);
  padding: 70px 0 36px 0;
  margin-top: 80px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand .brand-logo {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.7;
  max-width: 360px;
}

.footer-col h5 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.footer-col a:hover {
  color: var(--primary-light-violet);
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
}

.footer-bottom p {
  color: var(--text-dimmer);
  font-size: 0.84rem;
  margin-bottom: 12px;
}

/* 【核心任务 2：页脚 PBN 友情链接区（深沉、低调、完全融合）】 */
.footer-friend-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-dimmer);
  margin-top: 10px;
}

.footer-friend-links span {
  color: var(--text-dimmer);
}

.footer-friend-links a {
  color: var(--text-dimmer);
  text-decoration: none;
  font-size: 0.8rem;
  transition: var(--transition);
}

.footer-friend-links a:hover {
  color: var(--primary-light-violet);
  text-decoration: underline;
}

/* 移动端吸底悬浮条 */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background: rgba(6, 4, 12, 0.95);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 12px 20px;
  border-top: 1px solid var(--border-violet);
  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.75);
}

.mobile-sticky-bar .btn {
  width: 100%;
  font-size: 1rem;
  padding: 14px;
}

/* ==========================================================================
   响应式断点适配
   ========================================================================== */
@media (max-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-card.span-2 {
    grid-column: span 1;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .article-container {
    padding: 30px 20px;
  }
}

@media (max-width: 768px) {
  .header-nav .nav-menu {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--bg-deep);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border-subtle);
    display: none;
  }
  .header-nav .nav-menu.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .nav-cta-group .btn-secondary {
    display: none;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .mobile-sticky-bar {
    display: block;
  }
  body {
    padding-bottom: 70px;
  }
}