/* ==========================================================================
   u.cash - Button Components
   Primary, secondary, ghost, gradient variants with sizes and states.
   ========================================================================== */

/* ---- Base Button ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-body);
  font-weight: var(--weight-semibold);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  border: none;
  border-radius: var(--radius-md);
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
  position: relative;
  overflow: hidden;
  user-select: none;
}

.btn:active {
  transform: scale(0.97);
}

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

/* Button icon sizing */
.btn svg,
.btn img {
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

/* ---- Button Sizes ---- */

.btn-sm {
  height: 36px;
  padding-inline: var(--space-md);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wide);
  border-radius: var(--radius-sm);
}

.btn-md {
  height: 44px;
  padding-inline: var(--space-lg);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-wide);
}

.btn-lg {
  height: 52px;
  padding-inline: var(--space-xl);
  font-size: var(--text-base);
  border-radius: var(--radius-lg);
}

.btn-xl {
  height: 60px;
  padding-inline: var(--space-2xl);
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

/* ---- Primary Button ---- */

.btn-primary {
  background-color: var(--color-gold-primary);
  color: #000000;
  border: 1px solid transparent;
}

.btn-primary:hover {
  background-color: var(--color-gold-light);
  box-shadow: var(--shadow-gold);
}

.btn-primary:active {
  background-color: var(--color-gold-dark);
}

/* Shimmer effect on primary */
.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: none;
}

.btn-primary:hover::before {
  left: 100%;
  transition: left 0.5s var(--ease-default);
}

/* ---- Secondary Button ---- */

.btn-secondary {
  background-color: transparent;
  color: var(--color-gold-primary);
  border: 1px solid var(--color-gold-primary);
}

.btn-secondary:hover {
  background-color: var(--color-gold-subtle);
  border-color: var(--color-gold-light);
  color: var(--color-gold-light);
}

.btn-secondary:active {
  background-color: var(--color-gold-muted);
}

/* ---- Ghost Button ---- */

.btn-ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  color: var(--color-gold-primary);
  background-color: var(--color-gold-subtle);
}

.btn-ghost:active {
  background-color: var(--color-gold-muted);
}

/* ---- Gradient Button ---- */

.btn-gradient {
  background: linear-gradient(
    135deg,
    var(--color-gold-dark),
    var(--color-gold-primary),
    var(--color-gold-light)
  );
  background-size: 200% auto;
  color: #000000;
  border: 1px solid transparent;
}

.btn-gradient:hover {
  background-position: right center;
  box-shadow: var(--shadow-gold-lg);
}

.btn-gradient:active {
  background-position: left center;
}

/* ---- Glass Button ---- */

.btn-glass {
  background: var(--color-glass-bg);
  color: var(--color-text-primary);
  border: 1px solid var(--color-glass-border);
  backdrop-filter: blur(var(--blur-md));
  -webkit-backdrop-filter: blur(var(--blur-md));
}

.btn-glass:hover {
  background: var(--color-glass-bg-hover);
  border-color: var(--color-gold-primary);
  color: var(--color-gold-primary);
}

/* ---- Pill Button (full round) ---- */

.btn-pill {
  border-radius: var(--radius-full);
}

/* ---- Button with icon ---- */

.btn-icon-only {
  width: 44px;
  padding: 0;
  aspect-ratio: 1;
}

.btn-icon-only.btn-sm {
  width: 36px;
}

.btn-icon-only.btn-lg {
  width: 52px;
}

/* ---- Full Width Button ---- */

.btn-block {
  width: 100%;
}

/* ---- Button Group ---- */

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.btn-group .btn {
  flex-shrink: 0;
}

/* ---- Loading State ---- */

.btn-loading {
  pointer-events: none;
  position: relative;
  color: transparent !important;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn-primary.btn-loading::after {
  border-top-color: #000000;
}

/* ---- Disabled State ---- */

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

/* ---- Link-styled Button ---- */

.btn-link {
  background: none;
  border: none;
  color: var(--color-gold-primary);
  padding: 0;
  height: auto;
  font-weight: var(--weight-medium);
  text-decoration: none;
  border-radius: 0;
}

.btn-link:hover {
  color: var(--color-gold-light);
  text-decoration: underline;
}

/* ---- CTA Combo (Two buttons side by side) ---- */

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
}

@media (max-width: 575.98px) {
  .cta-group {
    flex-direction: column;
    width: 100%;
  }

  .cta-group .btn {
    width: 100%;
  }
}