body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #121212;
  color: #eee;
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#login-screen, #chat-screen {
  background: #1e1e1e;
  border-radius: 12px;
  padding: 20px;
  width: 90vw;
  max-width: 900px;
  height: 80vh;
  box-shadow: 0 0 15px #3b82f6;
  display: flex;
  flex-direction: column;
}

.hidden {
  display: none;
}

#error {
  color: #ff5555;
  margin-top: 10px;
}

#login-screen h2 {
  margin-bottom: 15px;
  text-align: center;
}

#site-password {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-size: 18px;
  background: #272727;
  color: #eee;
}

#login-btn {
  margin-top: 12px;
  padding: 12px;
  background: #3b82f6;
  border: none;
  border-radius: 8px;
  color: white;
  font-weight: bold;
  cursor: pointer;
  font-size: 18px;
  transition: background 0.3s ease;
}

#login-btn:hover {
  background: #2563eb;
}

#chat-screen {
  display: flex;
  height: 100%;
}

#chat-list {
  width: 25%;
  border-right: 2px solid #3b82f6;
  overflow-y: auto;
  padding-right: 10px;
}

#chat-list h3 {
  text-align: center;
  margin-bottom: 10px;
}

#chat-items {
  list-style: none;
  padding: 0;
  margin: 0;
}

#chat-items li {
  padding: 10px;
  background: #272727;
  margin-bottom: 8px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}

#chat-items li:hover {
  background: #3b82f6;
}

#chat-window {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding-left: 20px;
}

#messages {
  flex: 1;
  overflow-y: auto;
  background: #1c1c1c;
  border-radius: 12px;
  padding: 15px;
  margin-bottom: 15px;
  font-size: 18px;
}

.message {
  margin-bottom: 15px;
  line-height: 1.3;
  word-wrap: break-word;
}

.user-msg {
  color: #90cdf4;
  font-weight: 600;
}

.ai-msg {
  color: #fbbf24;
  font-weight: 600;
}

#error {
  color: #ff5555;
  margin-top: 10px;
}

#input-area {
  display: flex;
}

#ai-input {
  flex: 1;
  padding: 12px;
  border-radius: 8px 0 0 8px;
  border: none;
  font-size: 18px;
  background: #272727;
  color: #eee;
}

#send-btn {
  padding: 12px 20px;
  border: none;
  border-radius: 0 8px 8px 0;
  background: #3b82f6;
  color: white;
  font-weight: bold;
  cursor: pointer;
  font-size: 18px;
  transition: background 0.3s ease;
}

#send-btn:hover {
  background: #2563eb;
}