/* DST Chatbot — khung chat DST mới (FAQ theo nội dung DST). */
#dst-chatbot-toggle {
  position: fixed; right: 20px; bottom: 24px; z-index: 1000;
  width: 56px; height: 56px; border: 0; border-radius: 50%;
  background: #0e7c7b; color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 0, 0, .25);
}
#dst-chatbot-toggle:hover { background: #0a5e5d; }
#dst-chatbot-panel {
  position: fixed; right: 20px; bottom: 92px; z-index: 1000;
  width: 360px; max-width: calc(100vw - 32px);
  max-height: 520px; background: #fff; border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, .25);
  display: none; flex-direction: column; overflow: hidden;
  font-family: inherit; font-size: 14px; line-height: 1.5; color: #222;
}
#dst-chatbot-panel.open { display: flex; }
.dst-chat-head {
  background: #0e7c7b; color: #fff; padding: 12px 14px;
  display: flex; justify-content: space-between; align-items: center;
}
.dst-chat-head strong { display: block; font-size: 15px; }
.dst-chat-head span { font-size: 12px; opacity: .9; }
.dst-chat-dot {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: #4ade80; margin-right: 5px;
}
.dst-chat-close {
  background: none; border: 0; color: #fff; font-size: 22px;
  cursor: pointer; line-height: 1; padding: 0 2px;
}
.dst-chat-messages { flex: 1; overflow-y: auto; padding: 12px; min-height: 180px; }
.dst-chat-msg { margin-bottom: 10px; display: flex; }
.dst-chat-msg.user { justify-content: flex-end; }
.dst-chat-bubble {
  max-width: 85%; padding: 8px 12px; border-radius: 12px;
  background: #eef4f4; white-space: pre-wrap; word-break: break-word;
}
.dst-chat-msg.user .dst-chat-bubble { background: #0e7c7b; color: #fff; }
.dst-chat-quick { display: flex; flex-wrap: wrap; gap: 6px; padding: 0 12px 10px; }
.dst-chat-quick button {
  border: 1px solid #0e7c7b; background: #fff; color: #0e7c7b;
  border-radius: 16px; padding: 5px 12px; font-size: 13px; cursor: pointer;
}
.dst-chat-quick button:hover { background: #0e7c7b; color: #fff; }
.dst-chat-form { display: flex; border-top: 1px solid #e5e5e5; }
.dst-chat-form input {
  flex: 1; border: 0; padding: 11px 12px; font-size: 14px; outline: none; min-width: 0;
}
.dst-chat-form button {
  border: 0; background: #f97316; color: #fff; padding: 0 16px;
  font-size: 14px; font-weight: 700; cursor: pointer;
}
.dst-chat-foot {
  display: flex; justify-content: space-around; padding: 9px 0;
  border-top: 1px solid #e5e5e5; font-size: 13px;
}
.dst-chat-foot a { color: #0e7c7b; text-decoration: none; font-weight: 700; }
@media (max-width: 767px) {
  #dst-chatbot-toggle { bottom: 76px; }
  #dst-chatbot-panel { bottom: 140px; right: 12px; max-height: 62vh; }
}
@media (prefers-reduced-motion: reduce) {
  #dst-chatbot-toggle, #dst-chatbot-panel { transition: none; }
}