File Input

/* flex-file-input — USWDS File Input conformance
   File upload with drag-and-drop, preview, and validation */

flex-file-input {
  display: block;
  max-inline-size: var(--flex-control-max-width);
  inline-size: 100%;
}

.flex-file-input__target {
  border: 1px dashed var(--flex-gray-cool-30);
  display: block;
  font-size: 0.93rem;
  margin-block-start: 0.5rem;
  position: relative;
  text-align: center;
  inline-size: 100%;
  transition: border-color 0.15s ease, background-color 0.15s ease;

  &:hover {
    border-color: var(--flex-gray-60);
  }

  &[data-drag-active] {
    border-color: var(--flex-blue-vivid-60);
    border-style: solid;
    background-color: var(--flex-blue-vivid-5);
  }
}

.flex-file-input__target--error {
  border-color: var(--flex-color-error);
}

.flex-file-input__instructions {
  padding-block: 2rem;
  padding-inline: 1rem;
  pointer-events: none;
  position: relative;
  z-index: 3;
  color: var(--flex-color-text);
}

.flex-file-input__choose {
  color: var(--flex-blue-vivid-60);
  text-decoration: underline;
  font-weight: 400;
}

.flex-file-input__input {
  cursor: pointer;
  block-size: 100%;
  inset-inline-start: 0;
  margin: 0;
  max-inline-size: none;
  position: absolute;
  padding: 0.5rem;
  text-indent: -999em;
  inset-block-start: 0;
  inline-size: 100%;
  z-index: 1;
  opacity: 0;
  border: 0;

  &:focus + .flex-file-input__instructions {
    outline: 0.25rem solid var(--flex-blue-vivid-40);
    outline-offset: 0;
  }
}

/* --- Preview area --- */

.flex-file-input__preview-area {
  margin-block-start: 0.5rem;
}

.flex-file-input__preview {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  border: 1px solid var(--flex-gray-10);
  border-radius: 0.25rem;
  background-color: var(--flex-color-surface);
  margin-block-end: 0.25rem;
}

.flex-file-input__preview--error {
  border-color: var(--flex-color-error);
  background-color: var(--flex-color-error-lighter);

  & .flex-file-input__file-name {
    color: var(--flex-color-error);
    font-weight: 400;
  }
}

.flex-file-input__thumbnail {
  inline-size: 3rem;
  block-size: 3rem;
  object-fit: cover;
  border-radius: 0.125rem;
  flex-shrink: 0;
}

.flex-file-input__file-icon {
  display: inline-block;
  inline-size: 2rem;
  block-size: 2.5rem;
  flex-shrink: 0;
  background-color: var(--flex-gray-30);
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M14 2H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2V8l-6-6zm4 18H6V4h7v5h5v11z'/%3E%3C/svg%3E");
  mask-size: contain;
  mask-repeat: no-repeat;
}

.flex-file-input__file-info {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  flex: 1;
  min-inline-size: 0;
}

.flex-file-input__file-name {
  font-size: 0.93rem;
  font-weight: 700;
  color: var(--flex-color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.flex-file-input__file-size {
  font-size: 0.8rem;
  color: var(--flex-color-text-muted);
}

.flex-file-input__remove {
  display: flex;
  align-items: center;
  justify-content: center;
  inline-size: 1.5rem;
  block-size: 1.5rem;
  flex-shrink: 0;
  border: 0;
  border-radius: 50%;
  background-color: transparent;
  color: var(--flex-gray-60);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  padding: 0;

  &:hover {
    background-color: var(--flex-gray-10);
    color: var(--flex-color-text);
  }

  &:focus {
    outline: 0.25rem solid var(--flex-blue-vivid-40);
    outline-offset: 0;
  }
}

/* --- Screen reader status --- */

.flex-file-input__status {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}