/* ==========================================================================
   隐形人机场官网 - Cyber Server Dynamic Dark Glass Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root {
  --bg-main: #0B0F19;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.88);
  
  --text-primary: #FFFFFF;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  
  --accent-cyan: #38BDF8;
  --accent-teal: #22D3EE;
  --accent-indigo: #818CF8;
  --accent-gradient: linear-gradient(135deg, #38BDF8 0%, #818CF8 100%);
  --accent-gradient-hover: linear-gradient(135deg, #0284C7 0%, #6366F1 100%);
  --accent-light: rgba(56, 189, 248, 0.12);
  
  --border-light: rgba(255, 255, 255, 0.12);
  --border-glow: rgba(56, 189, 248, 0.3);
  --border-glow-hover: rgba(56, 189, 248, 0.6);
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 45px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 30px rgba(56, 189, 248, 0.3);
  
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Fullscreen Dynamic Server Image Layer */
.bg-server-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: url('assets/server-bg.png') center/cover no-repeat;
  z-index: -3;
  filter: brightness(0.65) contrast(1.15);
  transform: scale(1.04);
  animation: subtle-pan 22s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes subtle-pan {
  0% { transform: scale(1.02) translate(0, 0); }
  100% { transform: scale(1.08) translate(-15px, -10px); }
}

/* Dark Ambient Glow Overlay */
.dark-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at 50% 30%, rgba(11, 15, 25, 0.4) 0%, rgba(11, 15, 25, 0.85) 100%);
  z-index: -2;
  pointer-events: none;
}

/* Background Canvas for Dynamic Fiber-Optic Light Streams & Flying Particles */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

/* Layout Utilities */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
.navbar {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 48px);
  max-width: 1240px;
  z-index: 100;
  background: rgba(15, 23, 42, 0.82);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-full);
  padding: 12px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(11, 15, 25, 0.94);
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.8);
  padding: 10px 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #FFFFFF;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.4);
}

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

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.938rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--accent-cyan);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
  transition: var(--transition);
}

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

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

/* Glassmorphism Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius-full);
  font-size: 0.938rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.6);
  background: var(--accent-gradient-hover);
}

.btn-secondary {
  background: rgba(30, 41, 59, 0.8);
  color: #FFFFFF;
  border: 1px solid var(--border-glow);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(51, 65, 85, 0.9);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.813rem;
  font-weight: 600;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.3);
  margin-bottom: 20px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #34D399;
  box-shadow: 0 0 12px #34D399;
}

/* Hero Section - 左右双栏融合排版 Side-by-Side Split Hero */
.hero-section {
  padding-top: 160px;
  padding-bottom: 90px;
  position: relative;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-left {
  text-align: left;
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -1.2px;
  color: #FFFFFF;
  margin: 0 0 20px;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.8);
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 10px rgba(56, 189, 248, 0.3));
}

.hero-subtitle {
  font-size: 1.18rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 32px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.hero-features-list {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  color: var(--text-muted);
  font-size: 0.875rem;
  flex-wrap: wrap;
}

.hero-features-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: #E2E8F0;
}

.hero-features-list i {
  color: #34D399;
}

/* Integrated Tech Vector Illustration Card in Dark Cyber Style */
.hero-right {
  width: 100%;
}

.hero-illustration-card {
  padding: 28px;
  position: relative;
  overflow: hidden;
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-glow);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 30px rgba(56, 189, 248, 0.15);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.hero-illustration-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.8), 0 0 40px rgba(56, 189, 248, 0.3);
}

.illustration-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.813rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: var(--accent-light);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(56, 189, 248, 0.3);
  margin-bottom: 24px;
}

.illustration-graphic {
  position: relative;
  height: 240px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.graphic-glow {
  position: absolute;
  width: 170px;
  height: 170px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.35) 0%, rgba(129, 140, 248, 0.1) 70%, transparent 100%);
  filter: blur(30px);
}

.graphic-node {
  position: absolute;
  background: rgba(30, 41, 59, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 10px 16px;
  z-index: 2;
  color: #FFFFFF;
  transition: transform 0.3s ease;
}

.graphic-node:hover {
  transform: scale(1.06);
  border-color: var(--accent-cyan);
}

.hub-node {
  background: var(--accent-gradient);
  color: #ffffff;
  padding: 14px 22px;
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  box-shadow: 0 10px 30px rgba(56, 189, 248, 0.5);
}

.sat-node {
  color: #FFFFFF;
}

.sat-1 { top: 10px; left: 10px; }
.sat-2 { top: 10px; right: 10px; }
.sat-3 { bottom: 10px; left: 10px; }
.sat-4 { bottom: 10px; right: 10px; }

.graphic-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.illustration-footer {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 20px;
}

.stat-pill {
  text-align: center;
  background: rgba(30, 41, 59, 0.6);
  padding: 10px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.stat-num {
  display: block;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1.2;
}

.stat-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* Glassmorphism Dark Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow-hover);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

/* Node Latency & Status Section */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-tag {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-cyan);
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
}

.section-desc {
  font-size: 1.063rem;
  color: var(--text-secondary);
}

/* Latency Grid Monitor */
.status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

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

.status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

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

.node-flag {
  font-size: 1.6rem;
}

.node-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: #FFFFFF;
}

.node-type {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

.node-ping-badge {
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.813rem;
  font-weight: 700;
  background: rgba(52, 211, 153, 0.15);
  color: #34D399;
  border: 1px solid rgba(52, 211, 153, 0.3);
  display: flex;
  align-items: center;
  gap: 4px;
}

.ping-bar-container {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 12px;
}

.ping-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #34D399, #38BDF8);
  border-radius: 4px;
  width: 85%;
  transition: width 1s ease;
}

.node-metrics {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
  font-size: 0.813rem;
  color: var(--text-secondary);
}

/* Core Advantages Grid */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.advantage-card {
  padding: 32px;
  position: relative;
}

.advantage-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 24px;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.advantage-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #FFFFFF;
}

.advantage-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.popular {
  border: 2px solid var(--accent-cyan);
  box-shadow: 0 15px 40px rgba(56, 189, 248, 0.3);
  transform: translateY(-8px);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.4);
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #FFFFFF;
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.plan-price {
  margin-bottom: 28px;
}

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

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.price-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.938rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.plan-features i {
  color: var(--accent-cyan);
  font-size: 1rem;
}

/* FAQ Accordion */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  padding: 20px 24px;
  cursor: pointer;
  overflow: hidden;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.1rem;
  font-weight: 700;
  color: #FFFFFF;
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--accent-cyan);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding-top 0.3s ease;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-top: 14px;
}

/* Knowledge Base Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.article-card {
  padding: 28px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

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

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: #FFFFFF;
  transition: var(--transition);
}

.article-snippet {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.813rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

.read-more-link {
  color: var(--accent-cyan);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Reviews / Testimonials */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  padding: 28px;
}

.review-stars {
  color: #F59E0B;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  font-style: italic;
}

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

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.reviewer-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: #FFFFFF;
}

.reviewer-role {
  font-size: 0.813rem;
  color: var(--text-muted);
}

/* Footer */
.footer {
  padding: 60px 0 30px;
  border-top: 1px solid var(--border-light);
  background: rgba(11, 15, 25, 0.9);
  backdrop-filter: blur(10px);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  text-align: center;
}

.footer-text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Article Detail Page Specific Styles */
.article-page {
  padding-top: 140px;
  padding-bottom: 90px;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: 40px;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 20px;
  transition: var(--transition);
}

.back-btn:hover {
  color: var(--accent-cyan);
}

.article-main-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  color: #FFFFFF;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.article-info-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--text-muted);
  font-size: 0.875rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 20px;
}

.article-body {
  padding: 40px;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #FFFFFF;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-light);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  margin: 24px 0 12px;
}

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

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

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

.article-cta-box {
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  padding: 36px;
  color: #fff;
  text-align: center;
  margin-top: 50px;
  box-shadow: 0 15px 35px rgba(56, 189, 248, 0.35);
}

.article-cta-box h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
  color: #fff;
}

.article-cta-box p {
  opacity: 0.9;
  margin-bottom: 24px;
  font-size: 1rem;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-left {
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-features-list {
    justify-content: center;
  }
  .hero-title {
    font-size: 2.7rem;
  }
  .nav-menu {
    display: none;
  }
}

@media (max-width: 640px) {
  .navbar {
    width: calc(100% - 24px);
    padding: 10px 16px;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .pricing-card.popular {
    transform: none;
  }
  .article-body {
    padding: 24px 16px;
  }
  .illustration-footer {
    grid-template-columns: 1fr;
  }
}