:root {
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --bg-color: #f8fafc;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --white: #ffffff;
  --border-color: #e2e8f0;
  --success-color: #10b981;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

header {
  background: var(--white);
  padding: 1.25rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-links a {
  margin-left: 2rem;
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.3s;
}

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

.hero {
  text-align: center;
  padding: 6rem 5%;
  background: linear-gradient(135deg, #f0fdfa 0%, #eff6ff 100%);
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  font-weight: 800;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.btn-primary {
  display: inline-block;
  background-color: var(--primary-color);
  color: var(--white);
  padding: 1rem 2.5rem;
  border-radius: 9999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1.1rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.5);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.4);
}

.section-title {
  text-align: center;
  font-size: 2.2rem;
  margin: 4rem 0 3rem;
  font-weight: 700;
}

/* Pricing Section */
.pricing {
  padding: 4rem 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.pricing-cards {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.card {
  background: var(--white);
  border-radius: 1rem;
  padding: 2.5rem 2rem;
  width: 320px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.card.recommend {
  border: 2px solid var(--primary-color);
  transform: scale(1.05);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.card.recommend:hover {
  transform: scale(1.05) translateY(-10px);
}

.recommend-badge {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--primary-color);
  color: var(--white);
  padding: 0.25rem 1.5rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
}

.card h3 {
  font-size: 1.25rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-align: left;
}

.price {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 2rem;
  text-align: left;
}

.price span {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.price span.currency {
  font-size: 2rem;
}

.features {
  list-style: none;
  margin-bottom: 2.5rem;
  text-align: left;
}

.features li {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.features li::before {
  content: '✓';
  color: var(--success-color);
  font-weight: bold;
}

.btn-outline {
  display: block;
  width: 100%;
  padding: 0.875rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-outline:hover {
  background: #eff6ff;
  border-color: var(--primary-color);
}

.card.recommend .btn-outline {
  background: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
}

.card.recommend .btn-outline:hover {
  background: var(--primary-hover);
}

/* Node Status */
.nodes {
  padding: 4rem 5%;
  background: var(--white);
}

.node-container {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.5rem;
}

.node-item {
  background: var(--bg-color);
  padding: 1.5rem;
  border-radius: 1rem;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

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

.node-name {
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.node-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-family: monospace;
}

.status-dot {
  width: 10px;
  height: 10px;
  background: var(--success-color);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Articles Section */
.seo-articles {
  padding: 4rem 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.article-card {
  background: var(--white);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  text-decoration: none;
  transition: box-shadow 0.3s, transform 0.3s;
  display: block;
}

.article-card:hover {
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
  transform: translateY(-5px);
}

.article-card h4 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-size: 1.25rem;
  line-height: 1.4;
}

.article-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Footer */
footer {
  background: var(--white);
  padding: 3rem 5%;
  text-align: center;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-color);
}

.footer-links {
  margin-bottom: 1.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  margin: 0 1rem;
}

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

@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .card.recommend { transform: none; }
  .card.recommend:hover { transform: translateY(-5px); }
  .card { width: 100%; }
}