/* LMS UI U1-P2 — opt-in button and form primitives.
 * Apply with data-lms-primitives="u1-p2" on a page container/body and
 * data-lms-form on forms. Legacy pages remain visually unchanged until migrated.
 */

html[data-lms-design-system] [data-lms-primitives="u1-p2"] {
  --lms-control-height-sm: 2.25rem;
  --lms-control-height-md: 2.75rem;
  --lms-control-height-lg: 3rem;
  --lms-control-padding-inline: var(--lms-space-4);
  --lms-control-bg: var(--lms-color-surface);
  --lms-control-bg-readonly: var(--lms-color-surface-subtle);
  --lms-control-border: var(--lms-color-border);
  --lms-control-placeholder: var(--lms-color-text-muted);
  --lms-control-text: var(--lms-color-text-primary);
}

/* --------------------------------------------------------------------------
 * Button system
 * -------------------------------------------------------------------------- */
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn {
  -webkit-appearance: none;
  appearance: none;
  box-sizing: border-box;
  min-height: var(--lms-control-height-md);
  min-width: var(--lms-control-height-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--lms-space-2);
  padding: var(--lms-space-2) var(--lms-space-4);
  border: 1px solid transparent;
  border-radius: var(--lms-radius-md);
  font: inherit;
  font-size: var(--lms-font-size-body-sm);
  font-weight: var(--lms-font-weight-semibold);
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition:
    color var(--lms-duration-fast) var(--lms-ease-standard),
    background-color var(--lms-duration-fast) var(--lms-ease-standard),
    border-color var(--lms-duration-fast) var(--lms-ease-standard),
    box-shadow var(--lms-duration-fast) var(--lms-ease-standard),
    transform var(--lms-duration-fast) var(--lms-ease-standard);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn:hover {
  text-decoration: none;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn:active:not(:disabled):not([aria-disabled="true"]) {
  transform: translateY(1px);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn[aria-pressed="true"] {
  border-color: var(--lms-color-brand-500);
  box-shadow: inset 0 0 0 1px var(--lms-color-brand-500);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn:disabled,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--sm {
  min-height: var(--lms-control-height-sm);
  min-width: var(--lms-control-height-sm);
  padding: var(--lms-space-1) var(--lms-space-3);
  font-size: var(--lms-font-size-label);
  border-radius: var(--lms-radius-sm);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--lg {
  min-height: var(--lms-control-height-lg);
  min-width: var(--lms-control-height-lg);
  padding: var(--lms-space-3) var(--lms-space-6);
  font-size: var(--lms-font-size-body);
  border-radius: var(--lms-radius-lg);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--block {
  width: 100%;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--primary {
  color: var(--lms-color-neutral-0);
  background: var(--lms-color-brand-600);
  border-color: var(--lms-color-brand-600);
  box-shadow: none;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--primary:hover {
  color: var(--lms-color-neutral-0);
  background: var(--lms-color-brand-700);
  border-color: var(--lms-color-brand-700);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--secondary {
  color: var(--lms-color-text-primary);
  background: var(--lms-color-surface-elevated);
  border-color: var(--lms-color-text-muted);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--secondary:hover {
  color: var(--lms-color-text-primary);
  background: var(--lms-color-surface-subtle);
  border-color: var(--lms-color-text-primary);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--secondary:focus-visible {
  color: var(--lms-color-text-primary);
  background: var(--lms-color-surface-elevated);
  border-color: var(--lms-color-focus-ring);
  outline: 3px solid var(--lms-color-focus-ring);
  outline-offset: 2px;
  box-shadow: var(--lms-shadow-focus);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--secondary:active:not(:disabled):not([aria-disabled="true"]),
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--secondary.active {
  color: var(--lms-color-text-primary);
  background: var(--lms-color-brand-100);
  border-color: var(--lms-color-brand-600);
  box-shadow: inset 0 0 0 1px var(--lms-color-brand-600);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--secondary:disabled,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--secondary.disabled,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--secondary[aria-disabled="true"] {
  color: var(--lms-color-text-muted);
  background: var(--lms-color-surface-subtle);
  border-color: var(--lms-color-text-muted);
  opacity: 1;
}

:root[data-lms-theme="dark"] [data-lms-primitives="u1-p2"] .lms-btn--secondary:active:not(:disabled):not([aria-disabled="true"]),
:root[data-lms-theme="dark"] [data-lms-primitives="u1-p2"] .lms-btn--secondary.active,
:root[data-theme="dark"] [data-lms-primitives="u1-p2"] .lms-btn--secondary:active:not(:disabled):not([aria-disabled="true"]),
:root[data-theme="dark"] [data-lms-primitives="u1-p2"] .lms-btn--secondary.active {
  color: var(--lms-color-brand-100);
  background: var(--lms-color-surface-elevated);
  border-color: var(--lms-color-brand-400);
  box-shadow: inset 0 0 0 1px var(--lms-color-brand-400);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--ghost {
  color: var(--lms-color-link);
  background: transparent;
  border-color: transparent;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--ghost:hover {
  color: var(--lms-color-link-hover);
  background: var(--lms-color-surface-subtle);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--link {
  min-height: var(--lms-control-height-md);
  min-width: auto;
  padding: var(--lms-space-1);
  color: var(--lms-color-link);
  background: transparent;
  border-color: transparent;
  border-radius: var(--lms-radius-sm);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--link:hover {
  color: var(--lms-color-link-hover);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

html[data-lms-design-system] .lms-btn--warning,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--warning {
  color: var(--lms-color-warning-text);
  background: var(--lms-color-warning-bg);
  border-color: var(--lms-color-warning-border);
}
html[data-lms-design-system] .lms-btn--warning:hover,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--warning:hover {
  filter: brightness(0.96);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--danger {
  color: var(--lms-color-danger-text);
  background: var(--lms-color-danger-bg);
  border-color: var(--lms-color-danger-border);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--danger:hover {
  filter: brightness(0.96);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--success {
  color: var(--lms-color-success-text);
  background: var(--lms-color-success-bg);
  border-color: var(--lms-color-success-border);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--success:hover {
  border-color: var(--lms-color-success-text);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--icon {
  width: var(--lms-control-height-md);
  padding: 0;
  flex: 0 0 auto;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn__icon {
  width: 1.25rem;
  height: 1.25rem;
  flex: 0 0 auto;
}

html[dir="rtl"][data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn__icon--start {
  order: -1;
}

html[dir="rtl"][data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn__icon--end {
  order: 1;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn[aria-busy="true"],
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn.is-loading {
  position: relative;
  cursor: wait;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn[aria-busy="true"]::before,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn.is-loading::before {
  content: "";
  width: 1rem;
  height: 1rem;
  flex: 0 0 auto;
  border: 2px solid currentColor;
  border-inline-end-color: transparent;
  border-radius: 50%;
  animation: lms-spin 0.75s linear infinite;
}

@keyframes lms-spin {
  to { transform: rotate(360deg); }
}

/* --------------------------------------------------------------------------
 * Form primitives
 * -------------------------------------------------------------------------- */
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-form {
  color: var(--lms-color-text-primary);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-field {
  display: flex;
  flex-direction: column;
  gap: var(--lms-space-2);
  min-width: 0;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-field__label,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .form-label {
  margin: 0;
  color: var(--lms-color-text-primary);
  font-size: var(--lms-font-size-label);
  font-weight: var(--lms-font-weight-semibold);
  line-height: var(--lms-line-height-heading);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-required-marker {
  margin-inline-start: var(--lms-space-1);
  color: var(--lms-color-danger-text);
  font-size: var(--lms-font-size-caption);
  font-weight: var(--lms-font-weight-bold);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(
  .lms-control,
  .form-control,
  .form-select,
  input[type="text"],
  input[type="email"],
  input[type="password"],
  input[type="search"],
  input[type="tel"],
  input[type="url"],
  input[type="number"],
  input[type="date"],
  input[type="time"],
  input[type="file"],
  select,
  textarea
) {
  box-sizing: border-box;
  width: 100%;
  min-height: var(--lms-control-height-md);
  margin: 0;
  padding: var(--lms-space-2) var(--lms-control-padding-inline);
  color: var(--lms-control-text);
  caret-color: var(--lms-color-brand-500);
  background-color: var(--lms-control-bg);
  background-image: none;
  border: 1px solid var(--lms-control-border);
  border-radius: var(--lms-radius-md);
  box-shadow: none;
  font: inherit;
  font-size: var(--lms-font-size-body-sm);
  line-height: 1.5;
  transition:
    background-color var(--lms-duration-fast) var(--lms-ease-standard),
    border-color var(--lms-duration-fast) var(--lms-ease-standard),
    box-shadow var(--lms-duration-fast) var(--lms-ease-standard);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] textarea {
  min-height: 7rem;
  resize: vertical;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(select, .form-select) {
  -webkit-appearance: auto;
  appearance: auto;
  padding-inline-end: var(--lms-space-6);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea)::placeholder {
  color: var(--lms-control-placeholder);
  opacity: 1;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea):hover:not(:disabled):not([readonly]) {
  border-color: var(--lms-color-neutral-400);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea):focus,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea):focus-visible {
  color: var(--lms-control-text);
  background-color: var(--lms-control-bg);
  border-color: var(--lms-color-focus-ring);
  outline: 0;
  box-shadow: var(--lms-shadow-focus);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea):disabled {
  color: var(--lms-color-text-muted);
  background-color: var(--lms-color-surface-subtle);
  border-color: var(--lms-color-divider);
  opacity: 0.72;
  cursor: not-allowed;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea)[readonly] {
  color: var(--lms-color-text-secondary);
  background-color: var(--lms-control-bg-readonly);
  border-style: dashed;
  cursor: default;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea)[aria-invalid="true"],
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-field.is-invalid :where(.lms-control, .form-control, .form-select, input, select, textarea) {
  border-color: var(--lms-color-danger-border);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea)[aria-invalid="true"]:focus,
html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-field.is-invalid :where(.lms-control, .form-control, .form-select, input, select, textarea):focus {
  box-shadow: var(--lms-shadow-focus);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-field.is-valid :where(.lms-control, .form-control, .form-select, input, select, textarea),
html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea)[aria-invalid="false"][data-lms-validated="true"] {
  border-color: var(--lms-color-success-border);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-field__hint {
  margin: 0;
  color: var(--lms-color-text-muted);
  font-size: var(--lms-font-size-caption);
  line-height: var(--lms-line-height-heading);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-field__error {
  margin: 0;
  color: var(--lms-color-danger-text);
  font-size: var(--lms-font-size-label);
  font-weight: var(--lms-font-weight-medium);
  line-height: var(--lms-line-height-heading);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-form-summary {
  padding: var(--lms-space-3) var(--lms-space-4);
  color: var(--lms-color-danger-text);
  background: var(--lms-color-danger-bg);
  border: 1px solid var(--lms-color-danger-border);
  border-radius: var(--lms-radius-md);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-check {
  display: flex;
  align-items: flex-start;
  gap: var(--lms-space-2);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(input[type="checkbox"], input[type="radio"], .form-check-input) {
  -webkit-appearance: auto;
  appearance: auto;
  width: 1.125rem;
  height: 1.125rem;
  min-height: auto;
  flex: 0 0 auto;
  margin: 0.2rem 0 0;
  padding: 0;
  accent-color: var(--lms-color-brand-600);
  border: 1px solid var(--lms-color-border);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-switch {
  display: inline-flex;
  align-items: center;
  gap: var(--lms-space-2);
  min-height: var(--lms-control-height-md);
  cursor: pointer;
  user-select: none;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-switch__control {
  -webkit-appearance: none;
  appearance: none;
  position: relative;
  width: 2.75rem;
  height: 1.5rem;
  min-height: 1.5rem;
  flex: 0 0 auto;
  margin: 0;
  padding: 0;
  background: var(--lms-color-neutral-300);
  border: 1px solid var(--lms-color-border);
  border-radius: var(--lms-radius-pill);
  cursor: pointer;
  transition:
    background-color var(--lms-duration-fast) var(--lms-ease-standard),
    border-color var(--lms-duration-fast) var(--lms-ease-standard);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-switch__control::before {
  content: "";
  position: absolute;
  inset-block-start: 0.1875rem;
  inset-inline-start: 0.1875rem;
  width: 1rem;
  height: 1rem;
  background: var(--lms-color-neutral-0);
  border-radius: 50%;
  box-shadow: var(--lms-shadow-card);
  transition: transform var(--lms-duration-fast) var(--lms-ease-standard);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-switch__control:checked {
  background: var(--lms-color-brand-600);
  border-color: var(--lms-color-brand-600);
}

html[dir="rtl"][data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-switch__control:checked::before {
  transform: translateX(-1.25rem);
}

html[dir="ltr"][data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-switch__control:checked::before {
  transform: translateX(1.25rem);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-switch__control:disabled {
  cursor: not-allowed;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] input[type="file"] {
  padding: var(--lms-space-1);
  cursor: pointer;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] input[type="file"]::file-selector-button {
  min-height: calc(var(--lms-control-height-md) - var(--lms-space-2));
  margin-inline-end: var(--lms-space-3);
  padding: var(--lms-space-1) var(--lms-space-3);
  color: var(--lms-color-text-primary);
  background: var(--lms-color-surface-subtle);
  border: 0;
  border-inline-end: 1px solid var(--lms-color-divider);
  border-radius: var(--lms-radius-sm);
  font: inherit;
  font-weight: var(--lms-font-weight-medium);
  cursor: pointer;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-password-control {
  position: relative;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-password-control > input {
  padding-inline-end: 5rem;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-password-toggle {
  position: absolute;
  inset-block: 0;
  inset-inline-end: var(--lms-space-2);
  min-width: 4rem;
  min-height: 2.25rem;
  margin: auto 0;
  padding: 0 var(--lms-space-2);
  color: var(--lms-color-link);
  background: transparent;
  border: 0;
  border-radius: var(--lms-radius-sm);
  font: inherit;
  font-size: var(--lms-font-size-caption);
  font-weight: var(--lms-font-weight-semibold);
  cursor: pointer;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-file-preview {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--lms-space-3);
  align-items: center;
  margin-top: var(--lms-space-2);
  padding: var(--lms-space-3);
  color: var(--lms-color-text-secondary);
  background: var(--lms-color-surface-subtle);
  border: 1px dashed var(--lms-color-border);
  border-radius: var(--lms-radius-md);
  font-size: var(--lms-font-size-caption);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-file-preview[hidden] {
  display: none;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-file-preview__thumb {
  width: 3rem;
  height: 3rem;
  object-fit: cover;
  border-radius: var(--lms-radius-sm);
  background: var(--lms-color-surface);
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-file-preview__name {
  overflow: hidden;
  color: var(--lms-color-text-primary);
  font-weight: var(--lms-font-weight-semibold);
  text-overflow: ellipsis;
  white-space: nowrap;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-form[aria-busy="true"] {
  cursor: wait;
}

html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-form[aria-busy="true"] :where(input, select, textarea) {
  pointer-events: none;
}

@media (max-width: 767.98px) {
  html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn {
    min-height: 2.75rem;
  }

  html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn--sm {
    min-height: 2.75rem;
    min-width: 2.75rem;
  }

  html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-password-toggle,
  html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-check,
  html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-switch {
    min-height: 2.75rem;
  }

  html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(
    .lms-control,
    .form-control,
    .form-select,
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="search"],
    input[type="tel"],
    input[type="url"],
    input[type="number"],
    input[type="date"],
    input[type="time"],
    input[type="file"],
    select,
    textarea
  ) {
    min-height: 2.75rem;
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn[aria-busy="true"]::before,
  html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn.is-loading::before {
    animation-duration: 1.5s;
  }
}

@media (forced-colors: active) {
  html[data-lms-design-system] [data-lms-primitives="u1-p2"] .lms-btn,
  html[data-lms-design-system] [data-lms-primitives="u1-p2"] :where(.lms-control, .form-control, .form-select, input, select, textarea) {
    border: 1px solid ButtonText;
  }
}