:root {
  --primary-color: #00d2ff;
  --secondary-color: #3a7bd5;
  --bg-dark: #0a0f16;
  --bg-card: rgba(255, 255, 255, 0.05);
  --text-main: #ffffff;
  --text-muted: #a0aec0;
  --border-color: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(10, 15, 22, 0.7);
  --glass-border: 1px solid rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

* {
  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-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(0, 210, 255, 0.15), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(58, 123, 213, 0.15), transparent 25%);
  background-attachment: fixed;
}

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

ul {
  list-style: none;
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--glass-border);
  transition: padding 0.3s ease;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-links a {
  font-weight: 500;
  font-size: 1rem;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff;
  padding: 0.6rem 1.5rem;
  border-radius: 30px;
  font-weight: 600;
  display: inline-block;
  box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 210, 255, 0.5);
  color: #fff;
}

.btn-outline {
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
  padding: 0.6rem 1.5rem;
  border-radius: 30px;
  font-weight: 600;
  display: inline-block;
  transition: all 0.3s ease;
}

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

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem 2rem;
  position: relative;
}

.hero-content {
  max-width: 800px;
  z-index: 2;
  animation: fadeInUp 1s ease;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.highlight {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

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

.shape {
  position: absolute;
  background: linear-gradient(135deg, rgba(0, 210, 255, 0.1), rgba(58, 123, 213, 0.1));
  backdrop-filter: blur(5px);
  border-radius: 50%;
  animation: float 6s infinite ease-in-out;
}

/* Sections Common */
section {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

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

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

.card {
  background: var(--bg-card);
  border: var(--glass-border);
  border-radius: 20px;
  padding: 2.5rem;
  backdrop-filter: blur(10px);
  box-shadow: var(--glass-shadow);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  border-color: var(--primary-color);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  display: inline-block;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

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

/* Pricing */
.pricing-card {
  text-align: center;
  position: relative;
  overflow: hidden;
}

.pricing-card.popular {
  border-color: var(--primary-color);
}

.popular-badge {
  position: absolute;
  top: 20px;
  right: -35px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 0.3rem 3rem;
  transform: rotate(45deg);
  font-size: 0.8rem;
  font-weight: bold;
}

.price {
  font-size: 3rem;
  font-weight: 800;
  margin: 1.5rem 0;
  color: var(--primary-color);
}

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

.pricing-features {
  text-align: left;
  margin: 2rem 0;
}

.pricing-features li {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pricing-features i {
  color: var(--primary-color);
}

/* FAQ */
.faq-item {
  background: var(--bg-card);
  border: var(--glass-border);
  border-radius: 10px;
  margin-bottom: 1rem;
  overflow: hidden;
}

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

.faq-answer {
  padding: 0 1.5rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-muted);
}

.faq-item.active .faq-answer {
  padding: 0 1.5rem 1.5rem;
  max-height: 500px;
}

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

/* Articles layout */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.article-card {
  display: block;
}

.article-card .card {
  height: 100%;
}

.article-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
}

/* Footer & Tags */
footer {
  border-top: var(--glass-border);
  padding: 4rem 2rem 2rem;
  margin-top: 4rem;
  background: var(--bg-card);
}

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

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
}

.tags-cloud a {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.tags-cloud a:hover {
  background: rgba(0, 210, 255, 0.1);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}

/* Reviews */
.review-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.review-stars {
  color: #ffd700;
}
.review-user {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}
.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

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