/* ==========================================================================
   青云梯 (QingYunTi - qingyuntizi.best) 官方落地页全套视觉与响应式设计系统
   ========================================================================== */

:root {
  --bg-dark: #070913;
  --bg-card: rgba(15, 20, 36, 0.75);
  --bg-card-hover: rgba(22, 30, 54, 0.92);
  --bg-card-featured: rgba(20, 26, 52, 0.88);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(0, 242, 254, 0.45);
  --border-featured: rgba(59, 130, 246, 0.55);

  --primary: #00f2fe;
  --primary-glow: rgba(0, 242, 254, 0.35);
  --secondary: #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-purple-glow: rgba(139, 92, 246, 0.4);
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;

  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

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

  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(ellipse 65% 50% at 75% 20%, rgba(0, 242, 254, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 20% 70%, rgba(59, 130, 246, 0.07) 0%, transparent 70%),
    radial-gradient(circle 350px at 50% 10%, rgba(139, 92, 246, 0.05) 0%, transparent 80%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 动态背景画布 */
#ambientCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

/* 容器规范 */
.container {
  width: 100%;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
  z-index: 1;
}

.container-narrow {
  width: 100%;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  position: relative;
  z-index: 1;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 11px 24px;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe 0%, #3b82f6 100%);
  color: #050814;
  font-weight: 700;
  box-shadow: 0 4px 18px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(0, 242, 254, 0.55);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.05rem;
}

/* 顶部导航条 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 9, 19, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.site-header.scrolled {
  background: rgba(7, 9, 19, 0.96);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
}

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

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-logo-img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 0 16px rgba(0, 242, 254, 0.4);
  border: 1px solid rgba(0, 242, 254, 0.3);
}

.brand-text-wrap {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 30%, #00f2fe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.94rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-link:hover::after,
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: var(--radius-full);
}

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

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* 移动端菜单抽屉 */
.mobile-nav-drawer {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(7, 9, 19, 0.98);
  backdrop-filter: blur(20px);
  z-index: 99;
  display: flex;
  flex-direction: column;
  padding: 30px 24px;
  gap: 20px;
  transform: translateY(-120%);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
}

.mobile-nav-drawer.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav-link {
  font-size: 1.15rem;
  color: var(--text-primary);
  text-decoration: none;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.mobile-nav-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

/* ==========================================================================
   Hero 主视觉区
   ========================================================================== */
.hero-section {
  padding-top: 150px;
  padding-bottom: 90px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  text-align: center;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  background: rgba(0, 242, 254, 0.08);
  border: 1px solid rgba(0, 242, 254, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--primary);
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.15);
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 10px var(--primary);
  animation: pulseGlow 2s infinite ease-in-out;
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.6; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.15); }
}

.hero-title {
  font-size: clamp(2.3rem, 5.2vw, 3.9rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 15%, #00f2fe 65%, #8b5cf6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: clamp(1.02rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 38px;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.hero-guarantees {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 50px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.guarantee-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.guarantee-item svg {
  color: var(--primary);
  width: 16px;
  height: 16px;
}

/* 关键数据条 */
.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  background: rgba(15, 20, 36, 0.65);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  backdrop-filter: blur(12px);
  margin-top: 10px;
}

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

.stat-num {
  font-size: 1.85rem;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, #ffffff, #00f2fe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.84rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ==========================================================================
   价格方案区 (核心要求：所有价格要同排)
   ========================================================================== */
.pricing-section {
  padding: 90px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(13, 17, 36, 0.45) 50%, transparent 100%);
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 54px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

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

/* 核心：五大套餐在桌面端同排展示 */
.pricing-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(14px);
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
}

/* 爆款方案高光 (个人Silver) */
.pricing-card.featured {
  background: var(--bg-card-featured);
  border: 2px solid var(--primary);
  box-shadow: 0 8px 32px var(--primary-glow);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
  box-shadow: 0 18px 46px rgba(0, 242, 254, 0.5);
}

.pricing-badge-popular {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00f2fe, #3b82f6);
  color: #050814;
  font-size: 0.74rem;
  font-weight: 800;
  padding: 3px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(0, 242, 254, 0.5);
  white-space: nowrap;
}

.plan-top-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.plan-category-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
}

.plan-category-badge.badge-hot {
  background: rgba(0, 242, 254, 0.15);
  color: var(--primary);
  border: 1px solid rgba(0, 242, 254, 0.3);
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #ffffff;
}

.plan-price-wrap {
  margin: 16px 0 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.plan-currency {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  margin-right: 2px;
}

.plan-amount {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #ffffff;
}

.plan-cycle {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-left: 4px;
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.plan-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.45;
}

.plan-features-list li svg {
  width: 15px;
  height: 15px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 3px;
}

.plan-action-btn {
  width: 100%;
  margin-top: auto;
}

/* 价格补充提示 */
.pricing-footnote {
  text-align: center;
  margin-top: 36px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.pricing-footnote a {
  color: var(--primary);
  text-decoration: underline;
}

/* ==========================================================================
   核心优势 & 线路矩阵
   ========================================================================== */
.features-section {
  padding: 90px 0;
  position: relative;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #ffffff;
}

.feature-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 全球节点实测微展示 */
.nodes-section {
  padding: 90px 0;
  background: rgba(13, 17, 36, 0.3);
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.node-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

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

.node-flag {
  font-size: 1.5rem;
}

.node-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: #ffffff;
}

.node-type {
  font-size: 0.75rem;
  color: var(--text-muted);
}

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

.latency-val {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--accent-green);
  font-family: var(--font-mono);
}

.latency-tag {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ==========================================================================
   客户端生态与下载指引 (外链建设)
   ========================================================================== */
.clients-section {
  padding: 90px 0;
  position: relative;
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}

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

.client-card-top {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.client-os-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.client-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
}

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

.client-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.client-link-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}

/* ==========================================================================
   精选 SEO 资讯文章专栏
   ========================================================================== */
.articles-section {
  padding: 90px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(13, 17, 36, 0.5) 50%, transparent 100%);
}

.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 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-5px);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
}

.article-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary);
  background: rgba(0, 242, 254, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  align-self: flex-start;
}

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

.article-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

/* ==========================================================================
   用户口碑评价 (真实评价区)
   ========================================================================== */
.reviews-section {
  padding: 90px 0;
  position: relative;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

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

.review-stars {
  color: #fbbf24;
  font-size: 0.95rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.review-user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 14px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00f2fe, #3b82f6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #050814;
  font-size: 0.95rem;
}

.review-user-details h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
}

.review-user-details p {
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* ==========================================================================
   常见问题 FAQ
   ========================================================================== */
.faq-section {
  padding: 90px 0;
  background: rgba(13, 17, 36, 0.35);
}

.faq-list {
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

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

.faq-item.active {
  border-color: var(--primary);
  background: var(--bg-card-hover);
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  color: var(--primary);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px 24px;
  transition: max-height 0.4s ease-in-out;
}

/* ==========================================================================
   底部 CTA 转化横幅
   ========================================================================== */
.cta-banner-section {
  padding: 80px 0;
}

.cta-banner-box {
  background: linear-gradient(135deg, rgba(20, 26, 52, 0.9), rgba(15, 20, 36, 0.95));
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: var(--radius-lg);
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}

.cta-banner-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 250px;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.cta-banner-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  color: #ffffff;
}

.cta-banner-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.cta-banner-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ==========================================================================
   页脚 Footer
   ========================================================================== */
.site-footer {
  background: #04060d;
  border-top: 1px solid var(--border-color);
  padding: 70px 0 30px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}

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

.footer-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--primary);
}

.footer-keywords-box {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 30px;
}

.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* 浮动工具栏 */
.floating-widget {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.float-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(15, 20, 36, 0.85);
  border: 1px solid var(--border-color);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}

.float-btn:hover {
  background: var(--primary);
  color: #050814;
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* ==========================================================================
   文章详情页专有样式 (Articles Inner Pages)
   ========================================================================== */
.article-page {
  padding-top: 100px;
  padding-bottom: 80px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

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

.article-content-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px 38px;
  backdrop-filter: blur(14px);
}

.article-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.article-title-main {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.35;
  margin: 14px 0 16px;
  color: #ffffff;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-body-text {
  font-size: 1.02rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-body-text h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: #ffffff;
  margin: 40px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.article-body-text h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 28px 0 14px;
}

.article-body-text p {
  margin-bottom: 18px;
}

.article-body-text ul,
.article-body-text ol {
  margin-bottom: 22px;
  padding-left: 24px;
}

.article-body-text li {
  margin-bottom: 8px;
}

.article-body-text strong {
  color: #ffffff;
  font-weight: 700;
}

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

.article-body-text a.internal-link:hover {
  color: #70e8ff;
}

.article-cta-card {
  margin: 44px 0;
  padding: 32px 28px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.08), rgba(59, 130, 246, 0.12));
  border: 1px solid rgba(0, 242, 254, 0.35);
  border-radius: var(--radius-md);
  text-align: center;
}

.article-cta-card h3 {
  font-size: 1.35rem;
  margin-bottom: 10px;
  color: #ffffff;
}

.article-cta-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.article-related-box {
  margin-top: 50px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

.article-related-box h3 {
  font-size: 1.25rem;
  margin-bottom: 20px;
  color: #ffffff;
}

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

.related-article-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  transition: var(--transition);
}

.related-article-item a:hover {
  background: rgba(0, 242, 254, 0.08);
  border-color: var(--primary);
  color: #ffffff;
  transform: translateX(4px);
}

/* ==========================================================================
   响应式断点适配 (移动端极速适配)
   ========================================================================== */
@media (max-width: 1200px) {
  /* 当屏幕介于 1024px ~ 1200px 时，5 列稍微紧凑或水平允许滑动 */
  .pricing-row {
    grid-template-columns: repeat(5, minmax(210px, 1fr));
    overflow-x: auto;
    padding-bottom: 12px;
    scroll-snap-type: x mandatory;
  }
  .pricing-card {
    scroll-snap-align: start;
  }
}

@media (max-width: 1024px) {
  .nav-links,
  .nav-actions .btn-outline {
    display: none;
  }
  .mobile-menu-toggle {
    display: flex;
  }
  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .hero-section {
    padding-top: 110px;
    padding-bottom: 60px;
  }
  .hero-guarantees {
    gap: 16px;
    flex-direction: column;
  }
  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 16px;
  }
  .stat-num {
    font-size: 1.5rem;
  }
  /* 移动端价格：平滑侧滑或双列/单列流式呈现 */
  .pricing-row {
    display: flex;
    overflow-x: auto;
    gap: 14px;
    padding: 8px 4px 16px;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
  }
  .pricing-card {
    flex: 0 0 280px;
    scroll-snap-align: center;
    padding: 24px 18px;
  }
  .pricing-card.featured {
    transform: none;
  }
  .features-grid,
  .nodes-grid,
  .clients-grid,
  .articles-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .cta-banner-box {
    padding: 36px 20px;
  }
  .article-content-box {
    padding: 28px 18px;
  }
}