/* ==========================================================================
   AUTHIFY — Button Component
   Four types: primary, secondary, ghost, icon. Three sizes: sm, md, lg.
   ========================================================================== */

.btn{
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xs);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  white-space: nowrap;
  border-radius: var(--radius-full);
  padding: 0.85em 1.6em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-glass),
              box-shadow var(--dur-mid) var(--ease-glass),
              background var(--dur-mid) var(--ease-smooth),
              border-color var(--dur-mid) var(--ease-smooth),
              opacity var(--dur-fast) var(--ease-smooth);
  will-change: transform;
}
.btn:active:not(:disabled){ transform: scale(0.97); }
.btn:disabled{ opacity: 0.45; pointer-events: none; }

.btn--sm{ font-size: var(--text-xs); padding: 0.6em 1.2em; }
.btn--lg{ font-size: var(--text-base); padding: 1em 2em; }

/* Primary — highest emphasis, liquid glass + gold */
.btn--primary{
  color: var(--gold-contrast);
  background: linear-gradient(160deg, var(--gold-200), var(--gold-400) 60%, var(--gold-500));
  box-shadow: var(--shadow-gold), inset 0 1px 0 rgba(255,255,255,0.5);
}
[data-theme="dark"] .btn--primary{ color: #16140f; }
.btn--primary:hover{
  transform: translateY(-2px) scale(1.015);
  box-shadow: 0 14px 36px -8px rgba(173,136,88,0.45), inset 0 1px 0 rgba(255,255,255,0.6);
}

/* Secondary — glass, lower emphasis */
.btn--secondary{
  color: var(--color-text);
  background: var(--glass-surface);
  border-color: var(--glass-border);
  backdrop-filter: var(--blur-sm);
  -webkit-backdrop-filter: var(--blur-sm);
  box-shadow: var(--shadow-glass);
}
.btn--secondary:hover{
  transform: translateY(-2px);
  border-color: var(--gold-400);
  box-shadow: var(--shadow-float);
}

/* Ghost — minimal, transparent */
.btn--ghost{
  color: var(--color-text-muted);
  background: transparent;
}
.btn--ghost:hover{ color: var(--color-text); background: var(--glass-surface); }

/* Icon button — circular, equal height/width */
.btn--icon{
  width: 2.75em; height: 2.75em; padding: 0;
  border-radius: var(--radius-full);
  background: var(--glass-surface);
  border-color: var(--glass-border);
  backdrop-filter: var(--blur-sm);
  -webkit-backdrop-filter: var(--blur-sm);
  font-size: var(--text-base);
}
.btn--icon:hover{ transform: translateY(-1px); border-color: var(--gold-400); }
.btn--icon .icon{ width: 1.1em; height: 1.1em; }

.btn .icon{ width: 1em; height: 1em; }
.btn--primary .icon, .btn--secondary .icon{ transition: transform var(--dur-fast) var(--ease-glass); }
.btn:hover .icon{ transform: translateX(2px); }

/* Loading state */
.btn[data-loading="true"]{ color: transparent; pointer-events: none; }
.btn[data-loading="true"]::after{
  content: "";
  position: absolute;
  width: 1.1em; height: 1.1em;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-top-color: transparent;
  color: var(--gold-contrast);
  animation: btn-spin 700ms linear infinite;
}
@keyframes btn-spin{ to{ transform: rotate(360deg); } }