/* =========================================================
   NexaAI — Buttons
   ========================================================= */

.btn-nexa {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-standard),
    border-color var(--dur-fast) var(--ease-standard),
    color var(--dur-fast) var(--ease-standard),
    transform var(--dur-fast) var(--ease-standard);
  white-space: nowrap;
  line-height: 1.2;
}

.btn-nexa:active { transform: translateY(1px); }

.btn-nexa:disabled,
.btn-nexa.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-nexa-primary {
  background: var(--primary);
  color: var(--primary-ink);
  border-color: var(--primary);
}
.btn-nexa-primary:hover {
  background: color-mix(in srgb, var(--primary) 88%, black);
  color: var(--primary-ink);
  text-decoration: none;
}

.btn-nexa-secondary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.btn-nexa-secondary:hover {
  opacity: 0.85;
  color: var(--bg);
  text-decoration: none;
}

.btn-nexa-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-nexa-outline:hover {
  border-color: var(--text);
  color: var(--text);
  text-decoration: none;
  background: var(--surface-2);
}

.btn-nexa-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
}
.btn-nexa-ghost:hover {
  background: var(--surface-2);
  color: var(--text);
  text-decoration: none;
}

.btn-nexa-soft {
  background: var(--primary-soft);
  color: var(--primary-soft-ink);
  border-color: transparent;
}
.btn-nexa-soft:hover {
  background: color-mix(in srgb, var(--primary-soft) 80%, var(--primary) 20%);
  color: var(--primary-soft-ink);
  text-decoration: none;
}

.btn-nexa-danger {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: transparent;
}
.btn-nexa-danger:hover {
  background: var(--danger);
  color: #fff;
  text-decoration: none;
}

.btn-nexa-icon {
  padding: 9px;
  width: 38px;
  height: 38px;
}

.btn-nexa-sm { padding: 6px 14px; font-size: 0.82rem; }
.btn-nexa-lg { padding: 13px 26px; font-size: 1rem; }

.btn-nexa-block { width: 100%; }

/* Loading state */
.btn-nexa.is-loading {
  color: transparent !important;
  position: relative;
  pointer-events: none;
}
.btn-nexa.is-loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-top-color: transparent;
  color: var(--text);
  animation: nexa-spin 0.7s linear infinite;
}
.btn-nexa-primary.is-loading::after,
.btn-nexa-secondary.is-loading::after {
  color: var(--primary-ink);
}

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