:root {
  --bg-dark: #050505;
  --bg-card: #121212;
  --bg-card-hover: #1e1e1e;
  --text-main: #f0f0f0;
  --text-muted: #9e9e9e;
  --silver-accent: #b0bec5;
  --silver-light: #eceff1;
  --tech-glow: rgba(176, 190, 197, 0.2);
  --btn-bg: linear-gradient(135deg, #113a77, #0d2a56);
  --btn-hover: linear-gradient(135deg, #184ea0, #113a77);
  --border-color: #2c2c2c;
}

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

html {
  scroll-behavior: smooth;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  overflow-x: hidden;
}

body {
  line-height: 1.6;
  position: relative;
}

/* Background animated particles container */
#particles-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  background: radial-gradient(circle at center, #0f0f13 0%, #050505 100%);
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
  transition: all 0.3s ease;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--silver-light);
  text-transform: uppercase;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-brand span {
  color: var(--silver-accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: var(--silver-accent);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

.btn-primary {
  background: var(--btn-bg);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  display: inline-block;
}

.btn-primary:hover {
  background: var(--btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(17, 58, 119, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--silver-light);
  border: 1px solid var(--silver-accent);
}

.btn-outline:hover {
  background: rgba(176, 190, 197, 0.1);
}

/* Sections */
section {
  padding: 6rem 5%;
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--silver-light);
  font-weight: 700;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--silver-accent);
  margin: 15px auto 0;
  border-radius: 2px;
}

/* Hero Section */
#hero {
  height: 100vh;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
}

.hero-content {
  max-width: 800px;
  z-index: 10;
  animation: fadeInDown 1s ease-out;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #ffffff, #8a9aab);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

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

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

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

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: 12px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, transparent, var(--tech-glow));
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--silver-accent);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  font-size: 3rem;
  color: var(--silver-accent);
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--silver-light);
}

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

/* Pricing */
.pricing-card {
  text-align: center;
  padding: 3rem 2rem;
  display: flex;
  flex-direction: column;
}

.pricing-header {
  margin-bottom: 2rem;
}

.pricing-title {
  font-size: 1.25rem;
  color: var(--text-main);
  margin-bottom: 1rem;
  font-weight: 600;
}

.pricing-price {
  font-size: 3rem;
  font-weight: 700;
  color: var(--silver-light);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

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

.pricing-features {
  list-style: none;
  margin-bottom: 3rem;
  text-align: left;
  flex-grow: 1;
}

.pricing-features li {
  margin-bottom: 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

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

.pricing-features li.disabled::before {
  content: '×';
  color: #555;
}

.pricing-features li.disabled {
  color: #555;
}

.badge {
  background: rgba(76, 175, 80, 0.1);
  color: #4caf50;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  display: inline-block;
  margin-bottom: 15px;
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.discount-text {
  color: #1a66ff;
  font-size: 0.85rem;
  margin-bottom: 20px;
}

.btn-buy {
  background: #0d47a1;
  color: white;
  width: 100%;
  padding: 12px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  display: block;
  transition: background 0.3s;
}

.btn-buy:hover {
  background: #1565c0;
}

/* Reviews */
.review-card {
  font-style: italic;
}

.reviewer {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-top: 2rem;
  font-style: normal;
}

.reviewer-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--silver-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-dark);
  font-weight: bold;
}

.reviewer-info h4 {
  color: var(--silver-light);
}

.reviewer-info p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* FAQ */
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 1rem;
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.3s;
}

.faq-item:hover {
  border-color: var(--silver-accent);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--silver-light);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  color: var(--text-muted);
  margin-top: 0;
}

.faq-item.active .faq-answer {
  max-height: 200px;
  margin-top: 1rem;
}

.faq-icon {
  transition: transform 0.3s;
}

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

/* Knowledge Base */
.article-card {
  display: flex;
  flex-direction: column;
}

.article-date {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.article-title {
  font-size: 1.25rem;
  margin-bottom: 15px;
  color: var(--silver-light);
}

.article-link {
  margin-top: auto;
  color: var(--silver-accent);
  text-decoration: none;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 5px;
}

.article-link:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  background: #000;
  padding: 4rem 5% 2rem;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-col h3 {
  color: var(--silver-light);
  margin-bottom: 1.5rem;
}

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

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.3s;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
}

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

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}