:root {
  --bg-color: #0d0f1a;
  --card-bg: #151828;
  --card-hover: #1c2035;
  --text-primary: #ffffff;
  --text-secondary: #a0a5b8;
  --accent-color: #5c62fa;
  --accent-hover: #484de8;
  --border-color: #2a2e45;
  --gradient-bg: linear-gradient(135deg, #151828 0%, #1a1e35 100%);
}

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

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

a {
  text-decoration: none;
  color: var(--accent-color);
  transition: color 0.3s;
}

a:hover {
  color: var(--accent-hover);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
}

.logo span {
  color: var(--accent-color);
}

.nav-links a {
  margin-left: 30px;
  color: var(--text-secondary);
  font-weight: 500;
}

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

.btn {
  display: inline-block;
  background-color: var(--accent-color);
  color: #fff;
  padding: 12px 30px;
  border-radius: 8px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.btn:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(92, 98, 250, 0.4);
  color: #fff;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.btn-outline:hover {
  border-color: var(--text-secondary);
  background-color: transparent;
  color: #fff;
  box-shadow: none;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 100px 0 80px;
}

.hero h1 {
  font-size: 56px;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(to right, #fff, #a0a5b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 40px;
}

.hero .cta-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
}

/* Section common */
.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 50px;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--card-bg);
  padding: 40px 30px;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  transition: transform 0.3s, border-color 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
}

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

.feature-card h3 {
  font-size: 22px;
  margin-bottom: 15px;
}

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

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  align-items: center;
}

.pricing-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 40px;
  border: 1px solid var(--border-color);
  position: relative;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.pricing-card:hover {
  background: var(--card-hover);
}

.pricing-card.popular {
  border-color: var(--accent-color);
  box-shadow: 0 0 30px rgba(92, 98, 250, 0.15);
  transform: scale(1.05);
  z-index: 1;
}

.popular-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--accent-color);
  color: #fff;
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: bold;
}

.plan-name {
  font-size: 18px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 20px;
}

.plan-price {
  font-size: 48px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 30px;
  display: flex;
  justify-content: center;
  align-items: baseline;
}

.plan-price span {
  font-size: 16px;
  color: var(--text-secondary);
  font-weight: normal;
  margin-left: 5px;
}

.plan-features {
  list-style: none;
  margin-bottom: 40px;
  flex-grow: 1;
}

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

.plan-features li::before {
  content: '✓';
  color: var(--accent-color);
  font-weight: bold;
  margin-right: 10px;
}

.pricing-card .btn {
  width: 100%;
  background: transparent;
  border: 1px solid var(--border-color);
  color: #fff;
}

.pricing-card.popular .btn {
  background: var(--accent-color);
  border-color: var(--accent-color);
}

.pricing-card .btn:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

/* Articles */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.article-card {
  background: var(--card-bg);
  padding: 25px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: all 0.3s;
}

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

.article-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.article-card h3 a {
  color: #fff;
}

.article-card h3 a:hover {
  color: var(--accent-color);
}

.article-card p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.review-card {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 16px;
  border: 1px solid var(--border-color);
}

.review-text {
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

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

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-right: 15px;
}

.author-info h4 {
  font-size: 16px;
  margin-bottom: 2px;
}

.author-info p {
  font-size: 12px;
  color: var(--text-secondary);
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 15px;
  overflow: hidden;
}

.faq-question {
  padding: 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  transition: background 0.3s;
}

.faq-question:hover {
  background: var(--card-hover);
}

.faq-answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
  color: var(--text-secondary);
}

.faq-item.active .faq-answer {
  padding: 0 20px 20px;
  max-height: 200px;
}

.faq-item.active .faq-question span {
  transform: rotate(45deg);
}

.faq-question span {
  transition: transform 0.3s;
  font-size: 24px;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 50px 0 20px;
  text-align: center;
  color: var(--text-secondary);
}

.footer-links {
  margin-bottom: 30px;
}

.footer-links a {
  margin: 0 15px;
  color: var(--text-secondary);
}

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

@media (max-width: 768px) {
  .hero h1 {
    font-size: 36px;
  }
  .pricing-card.popular {
    transform: none;
  }
}