body {
  margin: 0;
  font-family: sans-serif;
  background: #0b1020;
  color: #eef2ff;
}

/* Header + Nav */
header {
  background: #121935;
  padding: 12px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: bold;
  color: #66e0ff;
}
nav ul {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 12px;
}
nav a {
  color: #66e0ff;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 6px;
}
nav a:hover {
  background: #1c2440;
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}
.hamburger span {
  width: 25px;
  height: 3px;
  background: #66e0ff;
  border-radius: 2px;
}
@media(max-width:700px){
  nav ul {
    display: none;
    flex-direction: column;
    background: #0b1020;
    position: absolute;
    top: 60px;
    right: 10px;
    border: 1px solid #333;
    border-radius: 8px;
    padding: 10px;
  }
  nav ul.show {
    display: flex;
  }
  .hamburger {
    display: flex;
  }
}

/* Hero */
.hero {
  text-align: center;
  padding: 60px 20px;
}
.hero h1 {
  font-size: 2em;
  color: #66e0ff;
}

/* Sections + Cards */
section {
  padding: 20px;
}
.card {
  background: #1c2440;
  padding: 15px;
  border-radius: 8px;
  margin: 10px 0;
}

/* Footer */
footer {
  background: #121935;
  padding: 20px;
  text-align: center;
  color: #bac2ff;
  margin-top: 20px;
}

/* Forms */
input, textarea {
  width: 100%;
  padding: 8px;
  margin: 6px 0;
  border-radius: 6px;
  border: 1px solid #444;
  background: #0b1020;
  color: #fff;
}
button {
  padding: 10px 16px;
  border: none;
  border-radius: 6px;
  background: #66e0ff;
  color: #000;
  cursor: pointer;
}

/* Chat bubbles */
#chat-window {
  height: 300px;
  overflow-y: auto;
  background: #1c2440;
  padding: 10px;
  border-radius: 6px;
  margin-bottom: 10px;
}
.bubble {
  padding: 8px 10px;
  border-radius: 6px;
  margin: 6px 0;
  max-width: 70%;
}
.bubble.user {
  background: #66e0ff;
  color: #000;
  margin-left: auto;
}
.bubble.ai {
  background: #b38cff33;
  border: 1px solid #b38cff;
  color: #fff;
  margin-right: auto;
}