.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-lg);
  height: 44px;
  border-radius: var(--border-radius-full);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              transform var(--transition-fast);
  font-family: var(--font-family);
  user-select: none;
  white-space: nowrap;
  line-height: 1;
  background-color: var(--primary);
  color: white;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

@media (hover: hover) and (pointer: fine) {
  .btn:hover {
    background-color: var(--primary-hover);
    box-shadow: var(--shadow-md);
  }
}

.btn:active {
  background-color: var(--primary-active);
  transform: scale(0.98);
}

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

/* Variants */
.btn--secondary {
  background-color: var(--text-muted);
  color: white;
}
.btn--secondary:hover {
  background-color: #4b5563;
}

.btn--outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-main);
}
.btn--outline:hover {
  background: var(--bg-body);
  border-color: var(--text-muted);
}

.btn--success {
  background-color: #10b981;
}
.btn--success:hover {
  background-color: #059669;
}

.btn--danger {
  background-color: #ef4444;
}
.btn--danger:hover {
  background-color: #dc2626;
}

/* Sizes */
.btn--sm {
  height: 36px;
  padding: 0 var(--space-md);
  font-size: var(--font-size-xs);
}
.btn--lg {
  height: 48px;
  padding: 0 var(--space-xl);
  font-size: var(--font-size-base);
}
.btn--icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--border-radius-md);
}
.btn--block {
  width: 100%;
}

/* Navbar buttons */
.btn--nav {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  color: white;
}
@media (hover: hover) and (pointer: fine) {
  .btn--nav:hover {
    background: rgba(255,255,255,0.25);
    border-color: rgba(255,255,255,0.4);
  }
}
.btn--nav:active {
  background: rgba(255,255,255,0.35);
  border-color: rgba(255,255,255,0.5);
}

/* Pagination buttons (can also be .btn--page) */
.btn--page {
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-md);
  border-radius: var(--border-radius-md);
  background: var(--color-input-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}
@media (hover: hover) and (pointer: fine) {
  .btn--page:hover:not(:disabled) {
    background: var(--color-input-hover);
    border-color: var(--border-color-hover);
  }
}
.btn--page:active {
  background: var(--color-input-active);
}
.btn--page.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
.btn--page:disabled {
  opacity: 0.5;
  background: var(--color-input-disabled);
}