/* Port Arc `button`. Tekan = scale lewat CSS (pengganti whileTap motion). Hanya token. */
.arc-button { position: relative; display: inline-flex; min-height: var(--control-height-md); align-items: center; justify-content: center; gap: var(--space-2); border: 1px solid transparent; border-radius: var(--radius-control); padding: 0 var(--space-4); font: inherit; font-size: var(--text-sm); font-weight: 500; line-height: var(--leading-body); white-space: nowrap; text-decoration: none; cursor: pointer; -webkit-tap-highlight-color: transparent; transition: color var(--duration-fast) var(--ease-standard), background var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard), opacity var(--duration-fast) var(--ease-standard), box-shadow var(--duration-fast) var(--ease-standard), transform var(--duration-instant) var(--ease-standard); }
.arc-button:focus-visible { outline: 2px solid var(--foreground); outline-offset: 2px; }
.arc-button:disabled { cursor: not-allowed; opacity: .52; }
.arc-button[aria-busy="true"] { cursor: progress; }
.arc-button:active:not(:disabled):not([aria-busy="true"]) { transform: scale(.97); }
.arc-button--full { width: 100%; }
.arc-button--primary { color: var(--background); background: var(--foreground); border-color: var(--foreground); }
.arc-button--secondary { color: var(--foreground); background: var(--surface); border-color: var(--border); }
.arc-button--ghost { color: var(--text-secondary); background: transparent; border-color: transparent; }
.arc-button--danger { color: var(--danger); background: var(--surface); border-color: var(--border); }
.arc-button--secondary:disabled, .arc-button--danger:disabled { opacity: 1; color: var(--text-muted); background: var(--surface-muted); border-color: var(--border); }
.arc-button--danger:disabled { color: color-mix(in oklab, var(--danger) 55%, var(--surface-muted)); }
.arc-button--ghost:disabled { opacity: 1; color: var(--text-muted); }
@media (hover: hover) and (pointer: fine) {
  .arc-button--primary:hover:not(:disabled) { opacity: .91; box-shadow: var(--shadow-resting); }
  .arc-button--secondary:hover:not(:disabled) { background: var(--surface-muted); box-shadow: var(--shadow-resting); }
  .arc-button--ghost:hover:not(:disabled) { color: var(--foreground); background: var(--surface-muted); }
  .arc-button--danger:hover:not(:disabled) { border-color: var(--danger); background: var(--surface-muted); }
}
.arc-button--primary:active:not(:disabled) { opacity: .84; }
.arc-button--secondary:active:not(:disabled), .arc-button--ghost:active:not(:disabled) { color: var(--foreground); background: var(--surface-muted); }
.arc-button--danger:active:not(:disabled) { border-color: var(--danger); background: var(--surface-muted); }
.arc-button--sm { min-height: var(--control-height-sm); padding-inline: var(--space-3); }
.arc-button--lg { min-height: var(--control-height-lg); padding-inline: var(--space-5); }
.arc-button__label { display: inline-flex; align-items: center; gap: var(--space-2); transition: opacity var(--duration-fast) var(--ease-standard); }
.arc-button[aria-busy="true"] .arc-button__label { opacity: 0; }
.arc-button__loader { position: absolute; left: 50%; top: 50%; display: none; width: var(--space-4); height: var(--space-4); margin: calc(var(--space-4) / -2) 0 0 calc(var(--space-4) / -2); }
.arc-button[aria-busy="true"] .arc-button__loader { display: grid; }
.arc-button__spinner { border: 1.5px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: arc-spin .7s linear infinite; }
@keyframes arc-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .arc-button, .arc-button__label { transition: none; } .arc-button:active:not(:disabled) { transform: none; } .arc-button__spinner { animation-duration: 1.6s; } }
/* Layar sentuh: ukuran sm tetap dilayani target 44px (F3). */
@media (pointer: coarse) { .arc-button--sm { min-height: var(--control-height-md); } }