:root {
  --primary: #0ea5e9;
  --primary-dark: #0284c7;
  --accent: #06b6d4;
  --success: #10b981;
  --warning: #f59e0b;
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-light: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border: rgba(14, 165, 233, 0.2);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  --radius: 16px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  padding: 1rem 0;
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

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

/* Hero Section */
.hero {
  margin-top: 80px;
  padding: 6rem 2rem 5rem;
  background: radial-gradient(ellipse at top, rgba(14, 165, 233, 0.15), transparent 50%),
              radial-gradient(ellipse at bottom, rgba(6, 182, 212, 0.1), transparent 50%);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.9rem;
  color: var(--primary);
  margin-bottom: 2rem;
  font-weight: 500;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 50%, var(--success) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-weight: 400;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

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

.btn {
  padding: 0.9rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  box-shadow: 0 10px 30px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  background: rgba(14, 165, 233, 0.1);
}

/* Slider Section */
.slider-section {
  padding: 3rem 2rem 5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
}

.slider-container {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.slider {
  display: flex;
  transition: transform 0.5s ease;
}

.slide {
  min-width: 100%;
  display: flex;
  flex-wrap: wrap;
  padding: 2rem;
  gap: 2rem;
}

.slide-content {
  flex: 1;
  min-width: 250px;
}

.slide-number {
  font-size: 3rem;
  font-weight: 800;
  color: rgba(14, 165, 233, 0.2);
  margin-bottom: 1rem;
}

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

.slide-content p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.slide-preview {
  background: rgba(14, 165, 233, 0.1);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.preview-icon {
  font-size: 2rem;
}

.preview-text {
  color: var(--primary);
  font-weight: 500;
}

.slide-image {
  flex: 1;
  min-width: 250px;
}

.image-placeholder {
  background: var(--bg-light);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
}

.image-placeholder svg {
  width: 100%;
  height: auto;
  max-height: 200px;
}

.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.5);
  border: none;
  color: white;
  font-size: 1.5rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.3s;
  z-index: 10;
}

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

.prev {
  left: 1rem;
}

.next {
  right: 1rem;
}

.slider-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  cursor: pointer;
  transition: all 0.3s;
}

.dot.active {
  background: var(--primary);
  width: 24px;
  border-radius: 10px;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  padding: 1.8rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.4s;
}

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

.feature-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.15), rgba(6, 182, 212, 0.15));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.2rem;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--primary);
  stroke-width: 1.7;
  fill: none;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.feature-list {
  list-style: none;
}

.feature-list li {
  padding: 0.3rem 0;
  color: var(--text-muted);
  display: flex;
  align-items: start;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.feature-list li::before {
  content: '✓';
  color: var(--success);
  font-weight: bold;
  flex-shrink: 0;
}

/* Advantages */
.advantages {
  background: linear-gradient(180deg, transparent, rgba(14, 165, 233, 0.05), transparent);
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.advantage-card {
  text-align: center;
  padding: 1.5rem;
}

.advantage-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto 1rem;
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.2), rgba(6, 182, 212, 0.2));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.advantage-icon svg {
  width: 35px;
  height: 35px;
  stroke: var(--accent);
  stroke-width: 1.5;
  fill: none;
}

.advantage-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.advantage-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Footer */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
}

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

.footer-text {
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

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

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s;
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero {
    padding: 5rem 1rem 3rem;
  }
  
  .section, .advantages, .slider-section {
    padding: 3rem 1rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .slide {
    flex-direction: column;
  }
  
  .slider-btn {
    padding: 0.3rem 0.7rem;
    font-size: 1rem;
  }
}

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

.fade-in {
  animation: fadeInUp 0.6s ease-out;
}