:root {
  --primary-color: #4f46e5;
  --primary-light: #eef2ff;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --background: #ffffff;
  --background-alt: #f9fafb;
  --border-color: #e5e7eb;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --radius: 12px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-color);
  line-height: 1.5;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--primary-color);
  text-decoration: none;
}

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

.nav-links a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

.mobile-menu-button {
  display: none;
}

/* Hero Section */
.hero {
  padding: 8rem 2rem 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  min-height: 80vh;
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--primary-color), #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: 2rem;
}

.cta-group {
  display: flex;
  gap: 1rem;
}

.cta-button {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: 1rem 2rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 500;
  transition: transform 0.2s, box-shadow 0.2s;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.secondary-button {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-color);
  padding: 1rem 2rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 500;
  transition: transform 0.2s;
}

.secondary-button:hover {
  transform: translateY(-2px);
}

.hero-image {
  flex: 1;
  max-width: 500px;
  margin-left: 2rem;
}

/* Chat Preview */
.chat-preview {
  background: white;
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  animation: float 6s ease-in-out infinite;
}

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

.chat-message {
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: var(--radius);
  max-width: 80%;
}

.chat-message.bot {
  background: var(--background-alt);
  margin-right: auto;
}

.chat-message.user {
  background: var(--primary-color);
  color: white;
  margin-left: auto;
}

/* Features Section */
.features {
  padding: 4rem 2rem;
  background: var(--background-alt);
}

.features h2 {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

/* How it Works Section */
.how-it-works {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.how-it-works h2 {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2.5rem;
}

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

.step {
  text-align: center;
  padding: 2rem;
}

.step-number {
  width: 40px;
  height: 40px;
  background: var(--primary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-weight: 600;
}

/* Testimonials Section */
.testimonials {
  padding: 4rem 2rem;
  background: var(--background-alt);
}

.testimonials h2 {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2.5rem;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.testimonial-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1.5rem;
}

.author-image {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
}

/* CTA Section */
.cta-section {
  padding: 6rem 2rem;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-color), #818cf8);
  color: white;
}

.cta-section h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta-section p {
  margin-bottom: 2rem;
  font-size: 1.25rem;
}

.cta-section .cta-button {
  background: white;
  color: var(--primary-color);
}

/* Footer */
footer {
  background: var(--text-color);
  color: white;
  padding: 4rem 2rem 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-section a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 6rem;
  }

  .hero-content {
    margin-bottom: 3rem;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-image {
    margin-left: 0;
  }

  .cta-group {
    justify-content: center;
  }

  .nav-links {
    display: none;
  }

  .mobile-menu-button {
    display: block;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
  }

  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .cta-group {
    flex-direction: column;
  }

  .features h2,
  .how-it-works h2,
  .testimonials h2,
  .cta-section h2 {
    font-size: 2rem;
  }
}