/* Button Base Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.875rem;
  line-height: 1.25;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  user-select: none;
  outline: none;
  min-height: 2.75rem;
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.75rem;
  min-height: 2rem;
}

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  min-height: 3.5rem;
}

/* Primary Button */
.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  color: white;
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px var(--shadow-colored);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #1e40af 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--shadow-colored);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px var(--shadow-colored);
}

/* Secondary Button */
.btn-secondary {
  background-color: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background-color: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-light);
}

.dark .btn-secondary {
  color: var(--primary-light);
  border-color: var(--primary-light);
}

.dark .btn-secondary:hover {
  background-color: rgba(37, 99, 235, 0.1);
  color: white;
}

/* Accent Button */
.btn-accent {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
  color: white;
  border-color: var(--accent-color);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

.btn-accent:hover {
  background: linear-gradient(135deg, var(--accent-hover) 0%, #047857 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.35);
}

/* Ghost Button */
.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary-light);
  border-color: transparent;
}

.btn-ghost:hover {
  background-color: var(--border-light);
  color: var(--text-primary-light);
}

.dark .btn-ghost {
  color: var(--text-secondary-dark);
}

.dark .btn-ghost:hover {
  background-color: var(--border-dark);
  color: var(--text-primary-dark);
}

/* Icon Buttons */
.btn-icon {
  padding: var(--space-sm);
  min-width: 2.75rem;
  border-radius: var(--radius-md);
}

.btn-icon.btn-sm {
  padding: var(--space-xs);
  min-width: 2rem;
}

/* Loading State */
.btn-loading {
  color: transparent;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  color: white;
}

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