:root {
  --primary-color: #0ea5e9;
  --primary-hover: #0284c7;
  --bg-color: #f0f9ff;
  --surface-color: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

/* Header & Nav */
header {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.logo-container img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-weight: 500;
}

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

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Hero Section */
.hero {
  padding: 8rem 2rem 5rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  background: linear-gradient(135deg, #0ea5e9, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

/* Pricing Section */
.pricing {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  font-weight: 700;
}

.pricing-image-container {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}

.pricing-image {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  display: none; /* Hidden by default, shown if image exists */
}

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

.card {
  background-color: var(--surface-color);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease;
  border: 1px solid var(--border-color);
  position: relative;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

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

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--primary-color);
  color: white;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.card-price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

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

.card-yearly {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

.card-features {
  list-style: none;
  margin-bottom: 2rem;
}

.card-features li {
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

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

/* Reviews Section */
.reviews {
  padding: 5rem 2rem;
  background-color: white;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.review-card {
  background-color: var(--bg-color);
  padding: 2rem;
  border-radius: 12px;
}

.review-text {
  font-style: italic;
  margin-bottom: 1.5rem;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 15px;
}

.avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
}

.author-info h4 {
  margin-bottom: 2px;
}

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

.stars {
  color: #fbbf24;
}

/* FAQ Section */
.faq {
  padding: 5rem 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--surface-color);
  border-radius: 8px;
  margin-bottom: 1rem;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.faq-question {
  padding: 1.5rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 0 1.5rem 1.5rem;
  color: var(--text-muted);
  display: none; /* Handled by JS in a real app, keeping it simple here */
}

/* For simplicity, use hover to show FAQ answer */
.faq-item:hover .faq-answer {
  display: block;
}
.faq-item:hover .faq-question {
  color: var(--primary-color);
}

/* SEO Articles Section */
.seo-articles {
  padding: 5rem 2rem;
  background-color: var(--surface-color);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.article-card {
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: all 0.3s ease;
}

.article-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.article-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  background-color: var(--text-main);
  color: white;
  padding: 3rem 2rem;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-links {
  margin-top: 1.5rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-muted);
}

.footer-links a:hover {
  color: white;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  .nav-links {
    display: none; /* Simple mobile nav hiding */
  }
}