/* ===================================================================
   一云梯 Yiyunti Network - 现代原创极简线条架构规范
   Original Minimalist Line Design System
   - Clean 1px geometric borders (#E2E8F0)
   - Deep slate typography (#0F172A)
   - Professional cloud-infrastructure visual hierarchy (Linear / Stripe vibe)
   - No cheap AI fluff, no pixel-level copying
   =================================================================== */

:root {
  --bg-page: #FFFFFF;
  --bg-muted: #F8FAFC;
  --bg-card: #FFFFFF;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: #EFF6FF;
  --primary-border: #BFDBFE;
  --success: #10B981;
  --success-light: #ECFDF5;
  --text-title: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  --text-subtle: #94A3B8;
  --border-color: #E2E8F0;
  --border-subtle: #F1F5F9;
  --border-hover: #94A3B8;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-subtle: 0 1px 3px 0 rgba(15, 23, 42, 0.04), 0 1px 2px -1px rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 12px 28px -6px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
  --transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  --max-w: 1200px;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.68;
  letter-spacing: -0.012em;
  position: relative;
  overflow-x: hidden;
}

/* Subtle background telemetry layer */
#zenCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
}

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

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

.container {
  width: 100%;
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* Typography & Section Titles */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 52px auto;
}
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--primary-light);
  border: 1px solid var(--primary-border);
  margin-bottom: 14px;
  letter-spacing: 0.02em;
}
.section-headline {
  font-size: 2.15rem;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: -0.03em;
  line-height: 1.25;
}
.section-subtext {
  font-size: 0.98rem;
  color: var(--text-muted);
  margin-top: 12px;
  line-height: 1.6;
}

/* Common Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.925rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  outline: none;
  white-space: nowrap;
}
.btn-primary {
  background-color: var(--primary);
  color: #FFFFFF;
}
.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.28);
  transform: translateY(-1px);
}
.btn-secondary {
  background-color: #FFFFFF;
  color: var(--text-title);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  background-color: #FFFFFF;
}
.btn-outline-blue {
  background-color: #FFFFFF;
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline-blue:hover {
  background-color: var(--primary-light);
}
.btn-pill-login {
  border-radius: var(--radius-full);
  padding: 6px 18px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-title);
  border: 1px solid var(--border-color);
  background: #FFFFFF;
}
.btn-pill-login:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.btn-pill-reg {
  border-radius: var(--radius-full);
  padding: 6px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #FFFFFF;
  background-color: var(--primary);
}
.btn-pill-reg:hover {
  background-color: var(--primary-hover);
}
.btn-block {
  width: 100%;
}
.btn-lg {
  padding: 13px 28px;
  font-size: 1rem;
  border-radius: var(--radius-sm);
}

/* ===================================================================
   Header & Navigation
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.brand-identity {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: #0F172A;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  flex-shrink: 0;
}
.brand-titles {
  display: flex;
  flex-direction: column;
}
.brand-main-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.brand-sub-badge {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.nav-menu-list {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-item-link {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.15s ease;
}
.nav-item-link:hover {
  color: var(--primary);
}
.nav-cta-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-toggle-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--text-title);
  cursor: pointer;
}
.mobile-menu {
  display: none !important;
}

/* ===================================================================
   Hero Section: Original, Clean, Authoritative
   =================================================================== */
.hero-wrapper {
  position: relative;
  padding: 70px 0 80px 0;
  background: radial-gradient(circle at 88% 18%, rgba(219, 234, 254, 0.4) 0%, transparent 48%),
              radial-gradient(circle at 10% 25%, rgba(241, 245, 249, 0.6) 0%, transparent 40%),
              #FFFFFF;
  border-bottom: 1px solid var(--border-color);
}
.hero-two-col {
  display: grid;
  grid-template-columns: 1.12fr 1fr;
  align-items: center;
  gap: 52px;
}
.hero-badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-title);
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-subtle);
  margin-bottom: 22px;
}
.hero-badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}
.hero-headline {
  font-size: 2.85rem;
  font-weight: 800;
  color: var(--text-title);
  letter-spacing: -0.035em;
  line-height: 1.18;
  margin-bottom: 18px;
}
.hero-headline span.highlight {
  color: var(--primary);
}
.hero-lead-text {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 32px;
  max-width: 530px;
}
.hero-action-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 34px;
}
.hero-trust-bar {
  display: flex;
  align-items: center;
  gap: 26px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  font-size: 0.825rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
}
.trust-icon {
  color: var(--primary);
  font-size: 0.95rem;
}

.hero-visual-frame {
  position: relative;
}
.hero-image-box {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: 0 20px 45px -12px rgba(15, 23, 42, 0.12);
  background: #FFFFFF;
}
.hero-real-photo {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}

/* ===================================================================
   Original Line-bordered Infrastructure Grid (核心架构优势)
   =================================================================== */
.features-section {
  padding: 90px 0;
  background-color: #FFFFFF;
}
.features-line-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-line-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.feature-line-card:hover {
  border-color: #94A3B8;
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}
.feature-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.feature-icon-badge {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background-color: var(--bg-muted);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: var(--primary);
}
.feature-metric-badge {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-muted);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-subtle);
}
.feature-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 10px;
}
.feature-card-desc {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.68;
}

/* ===================================================================
   Node Status Dashboard (Telemetry Board)
   =================================================================== */
.nodes-section {
  padding: 90px 0;
  background-color: var(--bg-muted);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}
.telemetry-top-bar {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}
.telemetry-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.live-pulse-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}
.nodes-board-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.node-line-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  transition: var(--transition);
}
.node-line-card:hover {
  border-color: #94A3B8;
  box-shadow: var(--shadow-subtle);
}
.node-row-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.node-city-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text-title);
}
.node-route-pill {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-light);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
}
.node-metrics-split {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}
.ping-number {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--success);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.ping-unit {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.node-unlock-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.unlock-pill {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: var(--radius-xs);
  background: #F1F5F9;
  color: #475569;
  font-weight: 500;
}
.unlock-pill.active {
  background: var(--success-light);
  color: #047857;
}

/* ===================================================================
   Pricing Plans Section (Distinctive Original Layout)
   =================================================================== */
.pricing-section {
  padding: 90px 0;
  background-color: #FFFFFF;
}
.pricing-cards-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  max-width: 1080px;
  margin: 0 auto;
  align-items: stretch;
}
.pricing-line-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}
.pricing-line-card:hover {
  border-color: #94A3B8;
  box-shadow: var(--shadow-hover);
}
.pricing-line-card.pro-plan {
  border: 2px solid var(--primary);
  box-shadow: 0 16px 36px -8px rgba(37, 99, 235, 0.12);
}
.plan-pill-ribbon {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--primary);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.03em;
  white-space: nowrap;
}
.plan-level-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-xs);
  font-size: 0.725rem;
  font-weight: 600;
  background-color: #0F172A;
  color: #FFFFFF;
  margin-bottom: 12px;
  width: fit-content;
}
.plan-level-tag.primary-tag {
  background-color: var(--primary);
}
.plan-card-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-title);
  margin-bottom: 6px;
}
.plan-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 42px;
  line-height: 1.5;
}
.plan-cost-display {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 20px 0;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}
.cost-symbol {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-title);
}
.cost-number {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-title);
  line-height: 1;
}
.cost-cycle {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-left: 2px;
}
.plan-items-list {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}
.plan-item-entry {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: #334155;
  margin-bottom: 12px;
  line-height: 1.5;
}
.check-icon-svg {
  width: 17px;
  height: 17px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ===================================================================
   FAQ Accordion Section
   =================================================================== */
.faq-section {
  padding: 90px 0;
  background-color: var(--bg-muted);
  border-top: 1px solid var(--border-color);
}
.faq-box-wrap {
  max-width: 820px;
  margin: 0 auto;
}
.faq-line-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-line-card.active {
  border-color: var(--primary-border);
}
.faq-header-btn {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 22px 26px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-title);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  gap: 16px;
}
.faq-header-btn:hover {
  color: var(--primary);
}
.faq-caret {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: transform 0.25s ease;
}
.faq-line-card.active .faq-caret {
  transform: rotate(180deg);
  color: var(--primary);
}
.faq-expandable-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 26px;
  color: var(--text-body);
  font-size: 0.925rem;
  line-height: 1.7;
}
.faq-line-card.active .faq-expandable-content {
  max-height: 320px;
  padding: 0 26px 22px 26px;
}

/* ===================================================================
   Tutorials Knowledge Base (12 Cards)
   =================================================================== */
.knowledge-section {
  padding: 90px 0;
  background-color: #FFFFFF;
  border-top: 1px solid var(--border-color);
}
.knowledge-line-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.tutorial-box-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}
.tutorial-box-card:hover {
  border-color: #94A3B8;
  box-shadow: var(--shadow-subtle);
  transform: translateY(-2px);
}
.tutorial-meta-pill {
  font-size: 0.725rem;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--primary-light);
  padding: 2px 8px;
  border-radius: var(--radius-xs);
  display: inline-block;
  margin-bottom: 12px;
  align-self: flex-start;
}
.tutorial-heading {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 10px;
  line-height: 1.45;
}
.tutorial-heading a:hover {
  color: var(--primary);
}
.tutorial-snippet {
  font-size: 0.86rem;
  color: var(--text-body);
  line-height: 1.62;
  margin-bottom: 20px;
  flex-grow: 1;
}
.tutorial-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.825rem;
  color: var(--text-muted);
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}
.read-more-text {
  color: var(--primary);
  font-weight: 600;
}

/* ===================================================================
   Testimonials / Reviews
   =================================================================== */
.reviews-section {
  padding: 90px 0;
  background-color: var(--bg-muted);
  border-top: 1px solid var(--border-color);
}
.reviews-line-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-line-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}
.review-line-card:hover {
  border-color: #94A3B8;
}
.review-feedback-text {
  font-size: 0.925rem;
  color: var(--text-body);
  line-height: 1.68;
  margin-bottom: 22px;
  flex-grow: 1;
}
.review-user-block {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}
.user-avatar-initial {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: #F1F5F9;
  color: var(--text-title);
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
}
.user-info-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-title);
}
.user-info-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===================================================================
   Bottom Big CTA
   =================================================================== */
.cta-section {
  padding: 80px 0;
  background-color: #FFFFFF;
  border-top: 1px solid var(--border-color);
}
.cta-slate-container {
  background: #0F172A;
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  color: #FFFFFF;
}
.cta-big-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 14px;
}
.cta-sub-copy {
  font-size: 1.05rem;
  color: #94A3B8;
  max-width: 560px;
  margin: 0 auto 30px auto;
}

/* ===================================================================
   Footer
   =================================================================== */
.site-footer {
  background: #FFFFFF;
  border-top: 1px solid var(--border-color);
  padding: 56px 0 32px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-four-col {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}
.footer-brand-p {
  margin-top: 14px;
  max-width: 320px;
  line-height: 1.65;
  color: #475569;
}
.footer-nav-col h5 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 16px;
}
.footer-links-list {
  list-style: none;
}
.footer-links-list li {
  margin-bottom: 10px;
}
.footer-links-list a:hover {
  color: var(--primary);
}
.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 26px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
}

/* ===================================================================
   Article Details Page (Line-bordered)
   =================================================================== */
.article-page-wrap {
  padding: 40px 0 80px 0;
  background-color: var(--bg-muted);
}
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.breadcrumb-nav a:hover {
  color: var(--primary);
}
.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 36px;
  align-items: start;
}
.article-main-body {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
}
.article-header {
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}
.article-header-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-xs);
  background-color: var(--primary-light);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 12px;
}
.article-header h1 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-title);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.article-meta-row {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.825rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.article-content {
  font-size: 1rem;
  color: #334155;
  line-height: 1.85;
}
.article-content h2 {
  font-size: 1.38rem;
  font-weight: 800;
  color: var(--text-title);
  margin: 36px 0 14px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}
.article-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-title);
  margin: 24px 0 10px 0;
}
.article-content p {
  margin-bottom: 16px;
}
.article-content ul, .article-content ol {
  margin: 14px 0 20px 22px;
}
.article-content li {
  margin-bottom: 8px;
}
.callout-box {
  background: #F8FAFC;
  border-left: 3px solid var(--primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0;
  font-size: 0.92rem;
  color: #334155;
}
.callout-box.tip {
  border-color: var(--success);
  background: var(--success-light);
}
.callout-box.warning {
  border-color: #F59E0B;
  background: #FFFBEB;
}
.table-responsive {
  overflow-x: auto;
  margin: 20px 0;
}
.article-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.article-table th, .article-table td {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  text-align: left;
}
.article-table th {
  background-color: var(--bg-muted);
  font-weight: 600;
  color: var(--text-title);
}
.article-code-block {
  background: #0F172A;
  color: #E2E8F0;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85rem;
  overflow-x: auto;
  margin: 20px 0;
  line-height: 1.6;
}
.article-sidebar {
  position: sticky;
  top: 90px;
}
.sidebar-cta-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  margin-bottom: 20px;
}
.sidebar-price-tag {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--primary);
  margin: 10px 0;
}
.sidebar-articles-card {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
}
.sidebar-articles-list {
  list-style: none;
  margin-top: 12px;
}
.sidebar-articles-list li {
  padding: 9px 0;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.85rem;
}
.sidebar-articles-list li:last-child {
  border-bottom: none;
}
.sidebar-articles-list a:hover {
  color: var(--primary);
}

/* ===================================================================
   Responsive
   =================================================================== */
@media (max-width: 1024px) {
  .hero-two-col {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .features-line-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-cards-container {
    grid-template-columns: 1fr;
    max-width: 460px;
  }
  .nodes-board-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .knowledge-line-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-line-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  .nav-menu-list {
    display: none;
  }
  .nav-toggle-btn {
    display: block;
  }
  .mobile-menu {
    display: none !important;
  }
  .mobile-menu.open {
    display: block !important;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
    padding: 20px 24px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
  }
  .mobile-menu .nav-menu-list {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 18px;
  }
  .hero-headline {
    font-size: 2.25rem;
  }
  .features-line-grid {
    grid-template-columns: 1fr;
  }
  .nodes-board-grid {
    grid-template-columns: 1fr;
  }
  .knowledge-line-grid {
    grid-template-columns: 1fr;
  }
  .reviews-line-grid {
    grid-template-columns: 1fr;
  }
  .footer-four-col {
    grid-template-columns: 1fr;
  }
  .footer-bottom-row {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .article-main-body {
    padding: 28px 20px;
  }
}