.hw-toggle {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 90;
  border: 1px solid #2563eb;
  background: #2563eb;
  color: #fff;
  border-radius: 999px;
  padding: 10px 14px;
  font-weight: 900;
  cursor: pointer;
}
.hw-panel {
  position: fixed;
  right: 16px;
  bottom: 68px;
  width: 320px;
  max-height: 60vh;
  z-index: 90;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,.12);
  display: none;
  overflow: hidden;
}
.hw-panel.open { display: block; }
.hw-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid #eef2f7;
  font-weight: 900;
}
.hw-body {
  height: 280px;
  overflow: auto;
  padding: 10px;
  background: #f8fafc;
}
.hw-msg { margin: 8px 0; }
.hw-msg .who { font-size: 11px; color: #64748b; font-weight: 900; }
.hw-msg .txt {
  margin-top: 4px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  background: #fff;
  padding: 8px 9px;
  font-size: 13px;
  line-height: 1.5;
}
.hw-msg.me .txt { background: #eff6ff; border-color: #bfdbfe; }
.hw-foot { display: flex; gap: 6px; padding: 10px; border-top: 1px solid #eef2f7; }
.hw-foot input { flex: 1; border: 1px solid #e5e7eb; border-radius: 10px; padding: 8px 10px; font-size: 13px; }
.hw-foot button {
  border: 1px solid #2563eb;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  font-weight: 900;
  padding: 8px 10px;
  cursor: pointer;
}
@media (max-width: 640px) {
  .hw-panel { width: calc(100vw - 20px); right: 10px; bottom: 62px; }
  .hw-toggle { right: 10px; bottom: 10px; }
}