.reading-tools {
  display: flex;
  gap: 1px;
  justify-content: flex-end;
  margin: 0 0 20px;
  flex-wrap: nowrap;
}
.reading-tools button {
  width: 50px;
  height: 38px;
  border: 1px solid #ddd;
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  color: #333;
  line-height: 1;
  transition: all .2s;
  flex-shrink: 1;
}
.reading-tools button:hover {
  background: #0a1f44;
  color: #fff;
  border-color: #0a1f44;
}
body.reading-dark .entry-content {
  background: #1a1a1a;
  color: #e0e0e0;
  padding: 20px;
  border-radius: 8px;
}
body.reading-dark .entry-content a { color: #7db4ff; }
body.reading-dark .entry-content span[style*="color"] { color: #9fc4ff !important; }

/* Mobile: thu nhỏ nút để không xuống dòng */
@media (max-width: 549px) {
  .reading-tools {
    gap: 4px;
    justify-content: center;
  }
  .reading-tools button {
    width: 40px;
    height: 34px;
    font-size: 12px;
    border-radius: 5px;
  }
}

/* Màn hình rất nhỏ (dưới 360px) */
@media (max-width: 360px) {
  .reading-tools {
    gap: 3px;
  }
  .reading-tools button {
    width: 34px;
    height: 32px;
    font-size: 11px;
  }
}