/* Shared, framework-independent controls. Rails and React load this same file.
   Existing class names are aliases; use ui-* names for new components. */
:is(.ui-button, .button, .control, .landing-button:not(:where(.landing-button--framed))) {
  --button-background: var(--color-accent);
  --button-foreground: var(--color-accent-ink);
  --button-hover: var(--color-accent-strong);
  --button-border: transparent;
  display: inline-flex;
  min-height: var(--control-height);
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.7rem var(--control-padding);
  border: 1px solid var(--button-border);
  border-radius: var(--radius-round);
  background: var(--button-background);
  color: var(--button-foreground);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out), border-color var(--dur-short) var(--ease-out), transform var(--dur-micro) var(--ease-out);
}
:is(.ui-button--secondary, .button--quiet, .control, .landing-button--quiet:not(:where(.landing-button--framed))) {
  --button-background: var(--color-surface-raised);
  --button-foreground: var(--color-ink);
  --button-hover: var(--color-surface-hover);
}
.control--primary {
  --button-background: var(--color-accent);
  --button-foreground: var(--color-accent-ink);
  --button-hover: var(--color-accent-strong);
}
.ui-button--outline {
  --button-background: var(--color-surface);
  --button-foreground: var(--color-ink);
  --button-hover: var(--color-surface-raised);
  --button-border: var(--color-rule-strong);
}
:is(.ui-button--ghost, .control--quiet) {
  --button-background: transparent;
  --button-foreground: var(--color-accent);
  --button-hover: var(--color-accent-soft);
}
:is(.ui-button--danger, .button--danger) {
  --button-background: var(--color-error);
  --button-foreground: var(--color-paper);
  --button-hover: color-mix(in srgb, var(--color-error) 85%, var(--color-ink));
}
:is(.ui-button--small, .button--small, .landing-button--compact) {
  min-height: var(--control-height-small);
  padding: 0.55rem 1rem;
  font-size: var(--text-sm);
}
.ui-button--large { min-height: 3rem; padding-inline: 1.75rem; }
.ui-button--icon { width: var(--control-height); min-height: var(--control-height); padding: 0; flex-shrink: 0; }
.ui-button--icon.ui-button--large { width: 3rem; min-height: 3rem; }
.ui-button > svg { width: 1rem; height: 1rem; flex-shrink: 0; pointer-events: none; }
:is(.ui-link, .text-link, .text-button, .landing-text-link), .ui-button--link {
  display: inline-flex;
  min-height: var(--control-height);
  align-items: center;
  gap: 0.4em;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-accent);
  font: 500 var(--text-base)/1.4 var(--font-body);
  text-decoration: none;
  text-underline-offset: 0.25em;
  cursor: pointer;
}
.text-button--danger { color: var(--color-error); }
:is(.ui-button, .button, .control, .landing-button):is(:disabled, [aria-disabled="true"], [data-state="disabled"]) {
  opacity: 0.5;
  color: var(--button-foreground);
  cursor: not-allowed;
  transform: none;
}
:is(.ui-button, .button, .control):is([aria-busy="true"], [data-state="loading"]) { cursor: wait; }
:is(.ui-button, .button, .control)[data-state="error"] { border-color: var(--color-error); }
:is(.ui-button, .button, .control)[data-state="success"] { border-color: var(--color-success); }
:is(.ui-button, .button, .control, .landing-button):not(:disabled):not([aria-disabled="true"]):active { transform: scale(0.96); }
:is(.ui-button, .button, .control, .ui-link, .text-link, .text-button, .landing-button, .landing-text-link):focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

/* Native inputs retain their browser semantics, validation and keyboard behavior. */
.field, .ui-field { display: grid; min-width: 0; align-content: start; gap: 0.5rem; }
:is(.field, .ui-field) label { color: var(--color-ink); font-size: var(--text-sm); font-weight: 600; }
:is(.field, .ui-field) :is(input:where(:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="submit"])), select, textarea), .ui-input {
  width: 100%;
  min-width: 0;
  min-height: var(--control-height);
  padding: 0.7rem 1rem;
  border: 1px solid var(--color-rule-strong);
  border-radius: var(--radius-small);
  background: var(--color-surface);
  color: var(--color-ink);
  font: inherit;
  font-size: 1rem;
  line-height: 1.25;
  transition: border-color var(--dur-short) var(--ease-out), box-shadow var(--dur-short) var(--ease-out);
}
:is(.field, .ui-field) textarea { min-height: 8rem; line-height: 1.5; resize: vertical; }
:is(.field, .ui-field) :is(input, textarea)::placeholder { color: var(--color-neutral); opacity: 1; }
:is(.field, .ui-field) :is(input, select, textarea):focus-visible, .ui-input:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-color: var(--color-focus);
  box-shadow: none;
}
:is(.field, .ui-field) :is(input, select, textarea):disabled, .ui-input:disabled { opacity: 0.55; cursor: not-allowed; }
:is(.field, .ui-field) :is([aria-invalid="true"], .field_with_errors input, .field_with_errors textarea, .field_with_errors select) { border-color: var(--color-error); }
.field .field_with_errors { display: contents; }
:is(.field, .ui-field) :is(input[type="checkbox"], input[type="radio"]) { width: 1.25rem; height: 1.25rem; min-height: 0; accent-color: var(--color-accent); }
.field-help, .ui-field__help { margin: 0; color: var(--color-muted); font-size: var(--text-sm); line-height: 1.5; }
.ui-field__error { margin: 0; color: var(--color-error); font-size: var(--text-sm); }

.ui-surface { padding: var(--space-xl); border-radius: var(--radius-large); background: var(--color-surface); box-shadow: var(--shadow-surface); }
.ui-badge, .status-chip { display: inline-flex; align-items: center; gap: 0.4em; width: fit-content; padding: 0.35rem 0.75rem; min-height: 1.75rem; border: 0; border-radius: var(--radius-round); background: var(--color-surface-raised); color: var(--color-ink-soft); font-size: var(--text-xs); font-weight: 600; line-height: 1.3; }
.ui-badge--success, .status-chip { background: var(--color-success-surface); color: var(--color-success); }
.ui-badge--error { background: var(--color-error-surface); color: var(--color-error); }
.ui-notice, .form-errors { padding: var(--space-md) var(--space-lg); border-radius: var(--radius-medium); background: var(--color-accent-soft); color: var(--color-ink); }
.ui-notice--error, .form-errors { background: var(--color-error-surface); border-inline-start: 3px solid var(--color-error); }
.ui-notice--success { background: var(--color-success-surface); }

@media (hover: hover) and (pointer: fine) {
  :is(.ui-button, .button, .control, .landing-button:not(:where(.landing-button--framed))):not(:disabled):not([aria-disabled="true"]):hover {
    background: var(--button-hover);
    color: var(--button-foreground);
    border-color: var(--button-border);
  }
  :is(.ui-link, .text-link, .text-button, .landing-text-link, .ui-button--link):hover { text-decoration: underline; }
  .ui-button--link:not(:disabled):hover { background: transparent; color: var(--color-accent); }
}
@media (pointer: coarse) {
  :is(.ui-button, .button, .control, .landing-button:not(:where(.landing-button--framed))) { min-height: 2.75rem; }
}
@media (prefers-reduced-motion: reduce) {
  :is(.ui-button, .button, .control, .landing-button) { transition: none; }
  :is(.ui-button, .button, .control, .landing-button):not(:disabled):active { transform: none; }
}

.ui-input[aria-invalid="true"] { border-color: var(--color-error); }

/* Theme switch: a 44px target and Lucide icons for the available appearance. */
.theme-toggle {
  display: inline-flex; width: 2.75rem; height: 2.75rem; flex: 0 0 2.75rem;
  align-items: center; justify-content: center; padding: 0; border: 0;
  border-radius: var(--radius-round); background: transparent; color: var(--color-ink);
  font: inherit;
  cursor: pointer;
}
.theme-toggle[hidden] { display: none; }
.theme-toggle__icon { width: 1.25rem; height: 1.25rem; flex-shrink: 0; pointer-events: none; }
.theme-toggle__icon--light { display: none; }
.theme-toggle[aria-checked="true"] .theme-toggle__icon--dark { display: none; }
.theme-toggle[aria-checked="true"] .theme-toggle__icon--light { display: block; }
.theme-toggle:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; }
@media (hover: hover) { .theme-toggle:hover { background: color-mix(in srgb, currentColor 8%, transparent); } }