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

:root {
  --primary-color: #0066cc;
  --primary-light: #3d8bff;
  --primary-dark: #004499;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --secondary-color: #6b7280;
  --background-light: #f8fafc;
  --background-white: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --border-radius: 12px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  background: var(--background-white);
  box-shadow: var(--shadow-sm);
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
}

.logo h1 {
  color: var(--primary-color);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 15px;
  transition: color 0.2s ease;
}

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

/* Main content */
main {
  margin-top: 80px;
}

/* Hero section */
.hero {
  background: linear-gradient(135deg, var(--background-light) 0%, #e0f2fe 100%);
  padding: 80px 0 100px;
  min-height: 600px;
  display: flex;
  align-items: center;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--warning-color);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 20px;
  letter-spacing: -0.025em;
}

.hero-description {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s ease;
  border: 2px solid transparent;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

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

/* Hero visual */
.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-card {
  background: var(--background-white);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  padding: 24px;
  width: 100%;
  max-width: 400px;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.card-dots {
  display: flex;
  gap: 4px;
}

.card-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-color);
}

.card-dots span:first-child {
  background: #ef4444;
}

.card-dots span:nth-child(2) {
  background: var(--warning-color);
}

.card-dots span:last-child {
  background: var(--success-color);
}

.card-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.stat-item i {
  font-size: 16px;
}

.text-success { color: var(--success-color); }
.text-primary { color: var(--primary-color); }
.text-warning { color: var(--warning-color); }

/* Sections */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.025em;
}

.section-header p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Features section */
.features {
  padding: 100px 0;
  background: var(--background-white);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--background-white);
  padding: 32px 24px;
  border-radius: var(--border-radius);
  text-align: center;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.feature-icon i {
  font-size: 24px;
  color: white;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Audience section */
.audience {
  padding: 100px 0;
  background: var(--background-light);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 40px;
}

.audience-item {
  text-align: center;
}

.audience-icon {
  width: 80px;
  height: 80px;
  background: var(--background-white);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.audience-icon i {
  font-size: 32px;
  color: var(--primary-color);
}

.audience-item h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.audience-item p {
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 300px;
  margin: 0 auto;
}

/* Contact section */
.contact {
  padding: 100px 0;
  background: var(--background-white);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-info .section-header {
  text-align: left;
  margin-bottom: 40px;
}

.contact-details {
  space-y: 32px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.contact-item i {
  font-size: 20px;
  color: var(--primary-color);
  width: 24px;
}

.contact-item div h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.contact-item a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.contact-item a:hover {
  text-decoration: underline;
}

.social-section {
  margin-top: 40px;
}

.social-section h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.social-links {
  display: flex;
  gap: 16px;
}

.social-links a {
  width: 44px;
  height: 44px;
  background: var(--background-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 18px;
  transition: all 0.2s ease;
  border: 1px solid var(--border-color);
}

.social-links a:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

.demo-card {
  background: var(--background-light);
  padding: 40px 32px;
  border-radius: var(--border-radius);
  text-align: center;
  border: 1px solid var(--border-color);
}

.demo-card h3 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.demo-card p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.6;
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: white;
  padding: 60px 0 24px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--primary-light);
}

.footer-section p {
  color: #d1d5db;
  line-height: 1.6;
  margin-bottom: 8px;
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid #374151;
  color: #9ca3af;
}

/* Responsive design */
@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-description {
    font-size: 18px;
  }

  .section-header h2 {
    font-size: 28px;
  }

  .contact-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .contact-info .section-header {
    text-align: center;
  }

  .nav {
    gap: 16px;
    flex-wrap: wrap;
  }

  .hero-buttons {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 60px 0 80px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .section-header h2 {
    font-size: 24px;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-buttons {
    flex-direction: column;
  }
}