.hfb-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: none;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
  transition: background 0.2s, transform 0.15s;
}
.hfb-btn:hover {
  background: #1d4ed8;
  transform: scale(1.08);
}

.hfb-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 24px;
}
.hfb-hidden {
  display: none !important;
}

.hfb-panel {
  background: #fff;
  border-radius: 12px;
  width: 380px;
  max-width: calc(100vw - 48px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
  display: flex;
  flex-direction: column;
}
.hfb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 12px;
  border-bottom: 1px solid #e5e7eb;
}
.hfb-title {
  font-weight: 600;
  font-size: 1rem;
  color: #111;
}
.hfb-close {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: #666;
  padding: 0 4px;
  line-height: 1;
}
.hfb-close:hover {
  color: #111;
}

.hfb-textarea {
  margin: 16px 20px 0;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  resize: vertical;
  min-height: 80px;
  outline: none;
}
.hfb-textarea:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

.hfb-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px 16px;
}
.hfb-status {
  font-size: 0.82rem;
  color: #666;
}
.hfb-submit {
  padding: 8px 20px;
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-weight: 500;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.hfb-submit:hover {
  background: #1d4ed8;
}
.hfb-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}