@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --primary: #FF6B9D;
  --secondary: #4FC3F7;
  --accent: #6BCB77;
  --background: #FFF8F0;
  --yellow: #FFD93D;
  --dark: #1A1A1A;
  --gray: #666666;
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--background);
  color: var(--dark);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  border-bottom: 1px solid rgba(0,0,0,0.1);
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

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

.nav-link {
  text-decoration: none;
  color: var(--dark);
  font-weight: 500;
  transition: color 0.3s ease;
}

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

/* Main */
.main {
  padding: 3rem 0;
}

.hero {
  text-align: center;
  padding: 4rem 0;
  animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero h2 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 1rem;
  color: var(--dark);
}

.hero p {
  font-size: 1.1rem;
  color: var(--gray);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-button {
  padding: 0.8rem 2rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.cta-button:hover {
  background: #ff5a8d;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 107, 157, 0.3);
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin: 4rem 0;
}

.feature-card {
  padding: 2rem;
  background: white;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: all 0.3s ease;
  animation: cardEnter 0.6s ease-out forwards;
  opacity: 0;
}

@keyframes cardEnter {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  margin-bottom: 0.8rem;
  color: var(--dark);
}

.feature-card p {
  color: var(--gray);
  font-size: 0.95rem;
}

/* Demo */
.demo {
  padding: 3rem 0;
  text-align: center;
}

.demo h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 2rem;
}

.chat-demo {
  max-width: 600px;
  margin: 2rem auto;
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.message {
  padding: 1rem;
  border-radius: 8px;
  animation: messageSlide 0.4s ease-out forwards;
  opacity: 0;
}

@keyframes messageSlide {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.user-message {
  background: var(--primary);
  color: white;
  text-align: left;
  margin-left: auto;
  max-width: 80%;
  animation-delay: 0.1s;
}

.ai-message {
  background: var(--secondary);
  color: white;
  text-align: left;
  margin-right: auto;
  max-width: 80%;
  animation-delay: 0.3s;
}

.message:nth-child(3) { animation-delay: 0.5s; }
.message:nth-child(4) { animation-delay: 0.7s; }

/* Footer */
.footer {
  text-align: center;
  padding: 2rem 0;
  border-top: 1px solid rgba(0,0,0,0.1);
  color: var(--gray);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }

  .nav {
    gap: 1rem;
  }

  .chat-demo {
    max-width: 100%;
  }

  .message {
    max-width: 95% !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}