body { font-family: 'Poppins', sans-serif; background: #0f172a; color: #e6eef8; margin: 0; display: flex; justify-content: center; align-items: center; min-height: 100vh; }
.container { width: 100%; max-width: 800px; padding: 20px; }
header { text-align: center; margin-bottom: 20px; }
header h1 { margin: 0; color: #38bdf8; }
header p { margin: 4px 0 12px; color: #cbd5e1; }
.back { color: #06b6d4; text-decoration: none; font-size: 14px; }
.chat-box { background: #1e293b; border-radius: 12px; padding: 16px; box-shadow: 0 4px 10px rgba(0,0,0,0.3); width:100%; }
.messages { min-height: 300px; max-height: 60vh; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; margin-bottom: 10px; padding:12px; }
.bubble { padding: 10px 14px; border-radius: 12px; max-width: 75%; line-height: 1.3; }
.user { align-self: flex-end; background: #0ea5a1; color: #021014; border-bottom-right-radius: 4px; }
.bot { align-self: flex-start; background: #0b1220; color: #cfe9ff; border-bottom-left-radius: 4px; border: 1px solid rgba(255,255,255,0.03); }
.chat-form { display: flex; gap: 8px; padding: 12px; }
.chat-form input { flex: 1; padding: 10px; border-radius: 8px; border: 1px solid #334155; background: #0f172a; color: #e6eef8; }
.chat-form button { padding: 10px 16px; border-radius: 8px; border: none; background: linear-gradient(90deg,#0ea5a1,#06b6d4); color: #021014; cursor: pointer; }