* {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  margin: 0;
  background: linear-gradient(135deg, #0f172a, #020617);
  color: #e5e7eb;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  text-align: center;
  padding: 20px;
  border-bottom: 1px solid #1e293b;
}

.header h1 {
  margin: 0;
  font-size: 26px;
  color: #38bdf8;
}

.header p {
  margin-top: 6px;
  color: #94a3b8;
  font-size: 14px;
}

.chat-container {
  flex: 1;
  max-width: 700px;
  margin: auto;
  width: 100%;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.messages {
  flex: 1;
  overflow-y: auto;
  margin-bottom: 15px;
}

.msg {
  margin-bottom: 12px;
  line-height: 1.4;
}

.msg.user {
  text-align: right;
}

.msg.bot {
  text-align: left;
  color: #a5f3fc;
}

.input-box {
  display: flex;
  gap: 10px;
}

textarea {
  flex: 1;
  resize: none;
  padding: 12px;
  border-radius: 8px;
  border: none;
  outline: none;
  font-size: 14px;
}

button {
  background: #38bdf8;
  border: none;
  border-radius: 8px;
  padding: 0 18px;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  background: #0ea5e9;
}

.footer {
  text-align: center;
  padding: 10px;
  font-size: 12px;
  color: #64748b;
}