:root {
    --primary: #007bff;
    --secondary: #0dcaf0;
    --gradient: linear-gradient(135deg, #007bff, #0dcaf0);
    --glass-bg: rgba(255,255,255,0.08);
    --glass-border: rgba(255,255,255,0.2);
  }
  
  * {margin: 0; padding: 0; box-sizing: border-box;}
  body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #0d1117, #1c1f27);
    color: #fff;
    overflow-x: hidden;
  }
  a { text-decoration: none; color: inherit; }
  
  /* Buttons */
  .btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    position: relative;
    overflow: hidden;
    margin: 0.5rem;
  }
  .btn-primary {
    background: var(--gradient);
    color: #fff;
    box-shadow: 0 0 12px rgba(0,123,255,0.6);
  }
  .btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 0 20px rgba(0,123,255,0.8);
  }
  .btn-outline {
    border: 2px solid rgba(255,255,255,0.6);
    background: transparent;
    color: #fff;
  }
  .btn-outline:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 0 15px rgba(255,255,255,0.2);
  }
  
  /* Glass card */
  .glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
  }
  
  /* Navbar */
  nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(10px);
    z-index: 1000;
  }
  nav a.brand {
    font-size: 1.3rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: .5rem;
  }
  
  /* Hero */
  .hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 5rem 1rem 2rem;
    position: relative;
  }
  .hero::after {
    content: "";
    position: absolute;
    top:0; left:0; right:0; bottom:0;
    background: rgba(0,0,0,0.6);
  }
  .hero .content {
    position: relative;
    z-index: 2;
    max-width: 800px;
  }
  .hero h1 {
    font-size: 3rem;
    font-weight: 700;
  }
  .typed-text {
    color: var(--secondary);
    font-weight: 600;
    border-right: 2px solid #fff;
    animation: blink 0.8s infinite;
  }
  @keyframes blink {
    50% { border-color: transparent; }
  }
  .hero p { margin-top: 1rem; font-size: 1.2rem; opacity: 0.85; }
  
  /* Cities */
  /* .cities {
    text-align: center;
    padding: 3rem 1rem;
  }
  .city-list {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 1rem;
  }
  .city {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
  } */
  
  /* Features */
  .features {
    padding: 5rem 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
  }
  .feature {
    text-align: center;
  }
  .feature i {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--secondary);
  }
  .feature h4 { margin-bottom: .5rem; }
  
  /* Base Feature Cards */
  .glass-card.feature {
  padding: 2rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(10px);
  text-align: center;
  color: #fff;
  transition: all 0.35s ease;
  }
  
  /* Hover Glow Effect */
  .glass-card.feature:hover {
  box-shadow: 0 0 25px rgba(0, 200, 255, 0.3), 0 0 50px rgba(0, 200, 255, 0.2);
  border-color: rgba(0, 200, 255, 0.4);
  background: rgba(0, 200, 255, 0.1);
  transform: translateY(-6px) scale(1.03);
  animation: none; /* stop pulsing when hovered */
  }
  
  .rotating-cities {
    position: relative;
    height: 50vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 2rem;
    text-align: center;
    overflow: hidden;
  }
  
  .city-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: brightness(0.15) blur(1px);
    z-index: -1;
    transition: background-image 1s ease;
  }
  
  #cityName {
    color: #00c8ff;
    border-right: 2px solid #00c8ff;
    padding-right: 5px;
    white-space: nowrap;
  }
  
  @media (min-width: 992px) {
    .features {
      grid-template-columns: repeat(3, 1fr);
    }
  }
  @media (max-width: 768px) {
    .features {
      grid-template-columns: repeat(2, 1fr);
    }
  }
  
  /* AI Demo */
  .ai-demo {
    padding: 5rem 2rem;
    text-align: center;
    position: relative;
  }
  .ai-chat {
    max-width: 700px;
    margin: auto;
    text-align: left;
    position: relative;
    overflow: hidden;
    border-radius: 20px;
    box-shadow: 0 0 25px rgba(0, 200, 255, 0.4);
    animation: pulseGlow 3s infinite alternate;
  }
  @keyframes pulseGlow {
    from { box-shadow: 0 0 20px rgba(0,200,255,0.3); }
    to { box-shadow: 0 0 40px rgba(0,200,255,0.6); }
  }
  .ai-message, .ai-response {
    margin-bottom: 1rem;
    padding: 1rem;
    border-radius: 12px;
    opacity: 0;
  }
  .ai-message {
  font-size: 1rem;
  line-height: 1.5;
  color: #fff;
  opacity: 1 !important; /* always visible */
  }
  .ai-response {
    background: rgba(0,123,255,0.3);
  }
  #aiCard {
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  }
  
  #aiCard::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at center, rgba(0, 123, 255, 0.25), transparent 60%);
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.1s ease;
  }
  .glass-chip {
  display: inline-block;
  margin: 0.3rem;
  padding: 0.5rem 1rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(6px);
  font-size: 0.9rem;
  color: #fff;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease;
  }
  
  .glass-chip.show {
  opacity: 1;
  transform: translateY(0);
  }
  /* Glow effect when hovered */
  .glass-chip:hover {
  box-shadow: 0 0 20px rgba(0, 200, 255, 0.6), 0 0 40px rgba(0, 200, 255, 0.4);
  border-color: rgba(0, 200, 255, 0.8);
  background: rgba(0, 200, 255, 0.15);
  transform: scale(1.05);
  }
  @keyframes popIn {
    to { opacity: 1; transform: scale(1); }
  }
  
  /* CTA */
  .cta {
    text-align: center;
    padding: 4rem 2rem;
  }
  .cta h2 { margin-bottom: 1rem; }
  
  /* Footer */
  footer {
    padding: 2rem;
    text-align: center;
    font-size: 0.9rem;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(10px);
  }
  footer .social a {
    margin: 0 .5rem;
    font-size: 1.2rem;
    color: #fff;
    opacity: 0.8;
  }
  footer .social a:hover { opacity: 1; }