/* ============================================================
   DiveLog DS — Component: Button
   Fonte: components.md §3
   ============================================================ */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: var(--button-height);
  padding: 0 var(--space-6);
  border: none;
  border-radius: var(--button-radius);
  font-family: var(--font-family-primary);
  font-size: var(--font-label-large);
  font-weight: var(--weight-medium);
  cursor: pointer;
  transition: background var(--motion-fast) var(--ease-standard);
  text-decoration: none;
}

.button--primary {
  background: var(--button-primary-background);
  color: var(--button-primary-text);
}
.button--primary:hover { filter: brightness(0.95); }

.button--secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}
.button--secondary:hover { background: var(--color-surface-container); }

.button--tertiary {
  background: transparent;
  color: var(--color-primary);
}
.button--tertiary:hover { background: var(--color-surface-container); }

.button--danger {
  background: var(--color-error);
  color: var(--color-on-error);
}
.button--danger:hover { filter: brightness(0.95); }

.button:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.button:disabled {
  opacity: .5;
  cursor: not-allowed;
}

.button--full-width {
  width: 100%;
}

/* ── Small variant (inline table actions) ── */
.button--sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-body-medium);
  min-height: 32px;
  height: auto;
}

.button--loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}
.button--loading::after {
  content: "";
  position: absolute;
  width: 1rem;
  height: 1rem;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: button-spin 0.8s linear infinite;
}

/* ── Icon (font riservato, evita shift durante il caricamento) ── */
.button__icon {
  font-size: 1.25rem;
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}
@keyframes button-spin {
  to { transform: rotate(360deg); }
}