:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f8fafc;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background-color: var(--card-bg);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-color);
  letter-spacing: 1px;
}

.nav-links {
  display: none;
  gap: 30px;
  align-items: center;
}

.nav-links a {
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
  padding: 10px 24px;
  border-radius: 8px;
  font-weight: 600;
  transition: background-color 0.2s, transform 0.2s;
  display: inline-block;
  text-align: center;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

/* Hero Section */
.hero {
  padding: 80px 20px;
  background: linear-gradient(135deg, #eff6ff 0%, #fff 100%);
  overflow: hidden;
}

.hero .container {
  display: flex;
  flex-direction: column;
  gap: 50px;
  align-items: center;
}

.hero-text {
  flex: 1;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  font-weight: 800;
  line-height: 1.3;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-muted);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-visual {
  flex: 1;
  position: relative;
  width: 100%;
  height: 300px;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Dynamic CSS Animation */
.dynamic-graphic {
  position: relative;
  width: 250px;
  height: 250px;
}

.orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px dashed rgba(37, 99, 235, 0.3);
  animation: spin linear infinite;
}

.orbit-1 { width: 100%; height: 100%; animation-duration: 20s; }
.orbit-2 { width: 60%; height: 60%; animation-duration: 15s; animation-direction: reverse; }

.core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
  border-radius: 50%;
  box-shadow: 0 0 30px rgba(37, 99, 235, 0.5);
  animation: pulse-core 2s ease-in-out infinite alternate;
}

.satellite {
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: #10b981;
  border-radius: 50%;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.5);
}

.satellite-2 {
  background-color: #f59e0b;
  top: 50%;
  right: -10px;
  left: auto;
  transform: translateY(-50%);
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.5);
}

@keyframes spin { 100% { transform: translate(-50%, -50%) rotate(360deg); } }
@keyframes pulse-core {
  0% { transform: translate(-50%, -50%) scale(0.9); box-shadow: 0 0 20px rgba(37, 99, 235, 0.4); }
  100% { transform: translate(-50%, -50%) scale(1.1); box-shadow: 0 0 40px rgba(37, 99, 235, 0.7); }
}



/* Sections */
section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 50px;
  font-weight: 700;
}

/* Grids */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

/* Cards */
.card {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
  border: 1px solid var(--border-color);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.card-icon {
  font-size: 40px;
  margin-bottom: 20px;
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 15px;
}

.card p {
  color: var(--text-muted);
}

/* Pricing */
.pricing-card {
  text-align: center;
  padding: 40px 30px;
}

.pricing-card.popular {
  border: 2px solid var(--primary-color);
  position: relative;
}

.popular-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--primary-color);
  color: white;
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.price {
  font-size: 3rem;
  font-weight: 800;
  margin: 20px 0;
  color: var(--text-main);
}

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

.features-list {
  list-style: none;
  margin: 30px 0;
  text-align: left;
}

.features-list li {
  margin-bottom: 15px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
}

.features-list li::before {
  content: "✓";
  color: #10b981;
  font-weight: bold;
  margin-right: 10px;
}

/* FAQ */
.faq-item {
  background-color: var(--card-bg);
  padding: 25px;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
}

.faq-item h4 {
  font-size: 1.125rem;
  margin-bottom: 10px;
}

.faq-item p {
  color: var(--text-muted);
}

/* Reviews */
.review-card {
  background-color: var(--card-bg);
  padding: 30px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.stars {
  color: #f59e0b;
  margin-bottom: 15px;
  font-size: 20px;
}

.reviewer {
  margin-top: 20px;
  font-weight: 600;
}

/* Footer */
footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 40px 0 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 15px;
  align-items: center;
  margin-bottom: 30px;
}



.footer-links a {
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #fff;
}

.copyright {
  text-align: center;
  font-size: 0.875rem;
  border-top: 1px solid #1e293b;
  padding-top: 20px;
}

/* Page content */
.page-content {
  background: white;
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
  margin-top: 40px;
  margin-bottom: 80px;
}

.page-content h1 {
  margin-bottom: 30px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.page-content h2 {
  margin-top: 30px;
  margin-bottom: 15px;
}

.page-content p, .page-content ul {
  margin-bottom: 20px;
  color: var(--text-muted);
}

.page-content ul {
  padding-left: 20px;
}

/* Article Cards */
.article-card {
    padding: 30px 25px;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    background: #ffffff;
}
.article-card:hover {
    border-color: rgba(37, 99, 235, 0.4);
    box-shadow: 0 12px 20px -5px rgba(37, 99, 235, 0.15);
}
.article-card h3 {
    margin: 0 0 12px 0;
    font-size: 1.2rem;
    line-height: 1.4;
    transition: color 0.2s;
}
.article-card:hover h3 {
    color: var(--primary-color);
}
.article-card p {
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-muted);
    flex-grow: 1;
}
@media (min-width: 768px) {
  .nav-links { display: flex; }
  .hero .container { flex-direction: row; text-align: left; }
  .hero-text { text-align: left; }
  .hero-text p { margin-left: 0; }
  .hero h1 { font-size: 3.2rem; }
  .dynamic-graphic { width: 350px; height: 350px; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .footer-links { flex-direction: row; justify-content: center; gap: 40px; }
}