/* ==========================================================================
   Buttons
   ========================================================================== */
.btn{
  --btn-bg: var(--surface-2);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--btn-bg);
  color: var(--text-0);
  font-weight: 600;
  font-size: .95rem;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast), box-shadow var(--dur-fast);
  will-change: transform;
}

.btn i, .btn svg{ font-size: 1.05em; }

.btn:hover{ border-color: var(--border-strong); }

.btn-primary{
  background: var(--grad-brand);
  border-color: transparent;
  box-shadow: var(--glow-red);
  color: #fff;
}

.btn-primary::before{
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(135deg, var(--amber-500), var(--red-500));
  opacity: 0;
  transition: opacity var(--dur-med) var(--ease-out);
}

.btn-primary:hover::before{ opacity: 1; }
.btn-primary:hover{ box-shadow: var(--glow-red-lg); transform: translateY(-2px); }

.btn-ghost{
  background: var(--surface);
}
.btn-ghost:hover{
  background: var(--surface-2);
  transform: translateY(-2px);
}

.btn-sm{ padding: 10px 20px; font-size: .85rem; }

.btn:active{ transform: translateY(0) scale(.97); }

.ripple{
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,.5);
  transform: scale(0);
  animation: rippleAnim .65s var(--ease-out);
  pointer-events: none;
}

.btn-primary .ripple{ background: rgba(255,255,255,.55); }

@keyframes rippleAnim{
  to{ transform: scale(3.2); opacity: 0; }
}

/* icon-only round buttons (utility bar, socials) */
.icon-btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-1);
  transition: all var(--dur-fast) var(--ease-out);
}
.icon-btn:hover{
  color: #fff;
  border-color: var(--red-500);
  box-shadow: 0 0 0 1px rgba(255,59,78,.3), 0 0 16px rgba(255,59,78,.35);
  transform: translateY(-2px);
}