/* ==========================================================================
   ByWave.top 纯原生 CSS 核心样式库 (零构建工具·极致秒开性能)
   ========================================================================== */

:root {
  --bg-dark: #060913;
  --bg-card: rgba(15, 23, 42, 0.72);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --bg-glass: rgba(13, 20, 36, 0.65);
  --border-color: rgba(56, 189, 248, 0.16);
  --border-highlight: rgba(0, 245, 255, 0.45);
  
  --primary-cyan: #00F5FF;
  --primary-blue: #0284C7;
  --primary-purple: #8B5CF6;
  --accent-gold: #F59E0B;
  --accent-green: #10B981;

  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;

  --gradient-brand: linear-gradient(135deg, #00F5FF 0%, #0284C7 50%, #8B5CF6 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.25) 0%, transparent 70%);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(0, 245, 255, 0.25);
  --shadow-gold: 0 0 25px rgba(245, 158, 11, 0.25);

  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-max: 1240px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-base);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
  background-color: var(--bg-dark);
}

/* 动态背景画布 (必须置于背景底色之上、内容容器之下) */
#bgCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 1;
}

/* 背景流动光环 (冰黄色微光环) */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  max-width: 1400px;
  height: 600px;
  background: radial-gradient(ellipse at top, rgba(250, 204, 21, 0.09) 0%, rgba(2, 132, 199, 0.04) 45%, transparent 75%);
  z-index: 0;
  pointer-events: none;
}

/* 核心内容层级：确保内容位于星空背景之上且可正常交互 */
main {
  position: relative;
  z-index: 1;
}

/* 容器与通用排版 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(6, 9, 19, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(56, 189, 248, 0.12);
  transition: background 0.3s;
}

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

.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo-img {
  height: 48px;
  width: auto;
  display: block;
}

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

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  transition: width 0.2s ease;
}

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

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

/* 移动端菜单切换按钮 */
.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
}

/* 核心按钮规范 (CTA必须规范化) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
  padding: 11px 24px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
  white-space: nowrap;
  text-align: center;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
}

.btn-lg {
  padding: 15px 36px;
  font-size: 17px;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: linear-gradient(135deg, #FFF9A6 0%, #FEE047 35%, #FACC15 75%, #EAB308 100%);
  color: #0A0F1D;
  font-weight: 800;
  border: 1px solid rgba(254, 240, 138, 0.65);
  box-shadow: 0 4px 22px rgba(250, 204, 21, 0.42);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(250, 204, 21, 0.65);
  filter: brightness(1.08);
  color: #020713;
}

.btn-pulse {
  animation: pulse-glow 2.8s infinite;
}

@keyframes pulse-glow {
  0% { box-shadow: 0 0 0 0 rgba(250, 204, 21, 0.6); }
  70% { box-shadow: 0 0 0 16px rgba(250, 204, 21, 0); }
  100% { box-shadow: 0 0 0 0 rgba(250, 204, 21, 0); }
}

.btn-secondary {
  background: rgba(30, 41, 59, 0.85);
  color: var(--text-primary);
  border-color: rgba(56, 189, 248, 0.3);
}

.btn-secondary:hover {
  background: rgba(51, 65, 85, 0.95);
  border-color: var(--primary-cyan);
  color: var(--primary-cyan);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--primary-cyan);
  border-color: rgba(0, 245, 255, 0.5);
}

.btn-outline:hover {
  background: rgba(0, 245, 255, 0.1);
  border-color: var(--primary-cyan);
  color: #FFFFFF;
}

/* 页面区段结构 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(250, 204, 21, 0.12);
  border: 1px solid rgba(250, 204, 21, 0.38);
  border-radius: var(--radius-full);
  color: #FACC15;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.5px;
  color: #FFFFFF;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   Hero 头部首屏
   ========================================================================== */
.hero-section {
  padding: 95px 0 75px 0;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  margin-bottom: 26px;
  font-size: 14px;
  color: var(--text-secondary);
}

.hero-pill-badge {
  background: var(--gradient-brand);
  color: #041021;
  font-size: 11px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.hero-title {
  font-size: clamp(34px, 5.2vw, 56px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  color: #FFFFFF;
  margin-bottom: 22px;
}

.text-gradient {
  background: linear-gradient(135deg, #FFFFFF 0%, #FFF89A 25%, #FACC15 65%, #EAB308 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline;
  filter: drop-shadow(0 2px 22px rgba(250, 204, 21, 0.35));
}

.hero-subtitle {
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px auto;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 980px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 22px 28px;
  border-radius: var(--radius-lg);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow-card);
}

.stat-item {
  text-align: center;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

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

.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary-cyan);
  line-height: 1.1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   套餐价格区 (严格同排 4 列水平对齐规范)
   ========================================================================== */
.pricing-section {
  background: linear-gradient(180deg, rgba(6, 9, 19, 0) 0%, rgba(13, 20, 36, 0.7) 50%, rgba(6, 9, 19, 0) 100%);
  position: relative;
}

.pricing-notice {
  margin-top: 14px;
  display: inline-block;
  padding: 6px 18px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: var(--radius-full);
  color: #34D399;
  font-size: 14px;
  font-weight: 600;
}

/* 核心：价格同排水平网格容器 */
.pricing-row-container {
  width: 100%;
}

.pricing-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch; /* 保证高度严格一致 */
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s, box-shadow 0.3s;
  backdrop-filter: blur(12px);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-glow);
}

/* 爆款高亮卡片 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(14, 30, 58, 0.9) 0%, rgba(15, 23, 42, 0.95) 100%);
  border: 2px solid var(--primary-cyan);
  box-shadow: 0 0 35px rgba(0, 245, 255, 0.28);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
  box-shadow: 0 0 45px rgba(0, 245, 255, 0.45);
}

.plan-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
  color: #0F172A;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-gold);
  white-space: nowrap;
}

.plan-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--primary-cyan);
  background: rgba(0, 245, 255, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.plan-name {
  font-size: 22px;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  min-height: 40px;
  line-height: 1.5;
  margin-bottom: 20px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 22px;
}

.currency-sym {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-cyan);
}

.price-digit {
  font-size: 44px;
  font-weight: 900;
  color: #FFFFFF;
  line-height: 1;
}

.price-cycle {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}

.plan-feature-list {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.5;
}

.plan-feature-list li strong {
  color: #FFFFFF;
}

.feature-icon-check {
  color: #10B981;
  font-weight: 800;
  font-size: 15px;
  line-height: 1;
  margin-top: 2px;
}

.plan-cta-btn {
  width: 100%;
}

/* ==========================================================================
   核心优势卡片区
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 32px 26px;
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  transition: transform 0.25s, border-color 0.25s;
}

.feature-box:hover {
  transform: translateY(-5px);
  border-color: var(--primary-cyan);
}

.feature-icon-badge {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(2, 132, 199, 0.15);
  border: 1px solid rgba(0, 245, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}

.feature-box h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #FFFFFF;
}

.feature-box p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   节点实测与全球覆盖
   ========================================================================== */
.nodes-section {
  position: relative;
}

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

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: border-color 0.2s, background 0.2s;
}

.node-card:hover {
  border-color: var(--primary-cyan);
  background: var(--bg-card-hover);
}

.node-info-main {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-flag {
  font-size: 28px;
}

.node-name {
  font-size: 16px;
  font-weight: 700;
  color: #FFFFFF;
}

.node-spec {
  font-size: 12.5px;
  color: var(--text-muted);
}

.node-metrics {
  text-align: right;
}

.node-ping {
  font-size: 17px;
  font-weight: 800;
  color: var(--accent-green);
  font-family: monospace;
}

.node-status {
  font-size: 11px;
  color: var(--accent-green);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-green);
  display: inline-block;
  animation: blink 2s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ==========================================================================
   客户端与协议支持
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 20px;
  text-align: center;
  transition: transform 0.2s;
}

.client-item:hover {
  transform: translateY(-4px);
  border-color: var(--primary-cyan);
}

.client-logo-icon {
  font-size: 34px;
  margin-bottom: 12px;
}

.client-item h4 {
  font-size: 17px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.client-item p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ==========================================================================
   文章精选与知识中心
   ========================================================================== */
.articles-section {
  position: relative;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s, border-color 0.25s;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary-cyan);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.article-tag-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.article-tag {
  font-size: 11.5px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(250, 204, 21, 0.12);
  color: #FACC15;
  border: 1px solid rgba(250, 204, 21, 0.35);
}

.article-card-title {
  font-size: 19px;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.4;
  margin-bottom: 12px;
}

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

.article-card-excerpt {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 14px;
}

.article-read-btn {
  font-size: 13px;
  font-weight: 700;
  color: #FACC15;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.2s, transform 0.2s;
}

.article-read-btn:hover {
  color: #FFF9A6;
  transform: translateX(3px);
}

/* ==========================================================================
   真实用户评价区
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  backdrop-filter: blur(8px);
}

.review-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.review-stars {
  color: #FBBF24;
  font-size: 16px;
  letter-spacing: 2px;
}

.review-verify-badge {
  font-size: 11px;
  color: var(--accent-green);
  background: rgba(16, 185, 129, 0.1);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.review-body {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284C7 0%, #8B5CF6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #FFFFFF;
  font-size: 16px;
}

.reviewer-name {
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
}

.reviewer-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题 FAQ
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-item:hover, .faq-item.active {
  border-color: rgba(250, 204, 21, 0.42);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: transparent;
  border: none;
  color: #FFFFFF;
  font-size: 16.5px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-icon-arrow {
  font-size: 18px;
  transition: transform 0.3s ease, color 0.2s;
  color: #FACC15;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out, padding 0.3s ease;
  padding: 0 24px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 20px;
}

/* ==========================================================================
   底部行动号召 CTA Banner
   ========================================================================== */
.bottom-cta-box {
  background: linear-gradient(135deg, rgba(14, 30, 58, 0.85) 0%, rgba(13, 20, 36, 0.95) 100%);
  border: 1px solid rgba(0, 245, 255, 0.35);
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  text-align: center;
  box-shadow: 0 0 40px rgba(0, 245, 255, 0.15);
  margin: 40px 0 20px 0;
}

.bottom-cta-box h3 {
  font-size: 32px;
  font-weight: 900;
  color: #FFFFFF;
  margin-bottom: 12px;
}

.bottom-cta-box p {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 28px auto;
}

/* ==========================================================================
   页脚与外部权威链接
   ========================================================================== */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(6, 9, 19, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 60px 0 30px 0;
  font-size: 14px;
  color: var(--text-muted);
}

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

.footer-brand p {
  margin: 16px 0;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}

/* ==========================================================================
   响应式断点优化 (确保所有价格在桌面端绝对同排，并在小屏上平滑自适应)
   ========================================================================== */
@media (max-width: 1080px) {
  .pricing-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }
  .features-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-matrix, .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 64px;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: rgba(6, 9, 19, 0.96);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
  }
  .nav-links.show {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  .stat-item:nth-child(2) {
    border-right: none;
  }
  .stat-item {
    border-right: 1px solid rgba(255, 255, 255, 0.08);
  }
  .pricing-row {
    grid-template-columns: 1fr;
  }
  .features-grid, .articles-grid, .reviews-grid, .nodes-matrix, .clients-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}