/**
 * Buttons System - Aprender21
 * Sistema de botones modernos 2025
 * Reemplaza botones de Bootstrap
 */

/* ========== BASE BUTTON ========== */

.btn,
.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-base);
  font-family: inherit;
}

.btn:focus,
.button:focus,
button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

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

/* ========== BUTTON VARIANTS ========== */

/* Primary Button */
.btn-primary {
  color: var(--color-white);
  background-color: var(--color-primary-600);
  border-color: var(--color-primary-600);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  border-color: var(--color-primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Secondary Button */
.btn-secondary {
  color: var(--color-white);
  background-color: var(--color-secondary-600);
  border-color: var(--color-secondary-600);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--color-secondary-700);
  border-color: var(--color-secondary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Success Button */
.btn-success {
  color: var(--color-white);
  background-color: var(--color-success);
  border-color: var(--color-success);
  box-shadow: var(--shadow-sm);
}

.btn-success:hover {
  background-color: var(--color-success-dark);
  border-color: var(--color-success-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Warning Button */
.btn-warning {
  color: var(--color-white);
  background-color: var(--color-warning);
  border-color: var(--color-warning);
  box-shadow: var(--shadow-sm);
}

.btn-warning:hover {
  background-color: var(--color-warning-dark);
  border-color: var(--color-warning-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Danger Button */
.btn-danger {
  color: var(--color-white);
  background-color: var(--color-error);
  border-color: var(--color-error);
  box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
  background-color: var(--color-error-dark);
  border-color: var(--color-error-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* ========== OUTLINE VARIANTS ========== */

.btn-outline {
  color: var(--color-gray-700);
  background-color: transparent;
  border-color: var(--color-gray-300);
}

.btn-outline:hover {
  color: var(--color-gray-900);
  background-color: var(--color-gray-50);
  border-color: var(--color-gray-400);
}

.btn-outline-primary {
  color: var(--color-primary-600);
  background-color: transparent;
  border-color: var(--color-primary-600);
}

.btn-outline-primary:hover {
  color: var(--color-white);
  background-color: var(--color-primary-600);
  border-color: var(--color-primary-600);
}

.btn-outline-secondary {
  color: var(--color-secondary-600);
  background-color: transparent;
  border-color: var(--color-secondary-600);
}

.btn-outline-secondary:hover {
  color: var(--color-white);
  background-color: var(--color-secondary-600);
  border-color: var(--color-secondary-600);
}

/* ========== GHOST VARIANTS ========== */

.btn-ghost {
  color: var(--color-gray-700);
  background-color: transparent;
  border-color: transparent;
}

.btn-ghost:hover {
  color: var(--color-gray-900);
  background-color: var(--color-gray-100);
}

.btn-ghost-primary {
  color: var(--color-primary-600);
  background-color: transparent;
  border-color: transparent;
}

.btn-ghost-primary:hover {
  background-color: var(--color-primary-50);
}

/* ========== BUTTON SIZES ========== */

.btn-xs {
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--font-size-xl);
}

/* ========== BUTTON SHAPES ========== */

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

.btn-square {
  border-radius: 0;
}

.btn-rounded {
  border-radius: var(--radius-lg);
}

/* ========== BUTTON WIDTHS ========== */

.btn-block {
  display: flex;
  width: 100%;
}

.btn-auto {
  width: auto;
}

/* ========== ICON BUTTONS ========== */

.btn-icon {
  padding: var(--space-3);
  aspect-ratio: 1;
}

.btn-icon-sm {
  padding: var(--space-2);
  font-size: var(--font-size-sm);
}

.btn-icon-lg {
  padding: var(--space-4);
  font-size: var(--font-size-lg);
}

/* ========== BUTTON GROUPS ========== */

.btn-group {
  display: inline-flex;
  gap: 0;
}

.btn-group .btn {
  border-radius: 0;
  border-right-width: 0;
}

.btn-group .btn:first-child {
  border-top-left-radius: var(--radius-md);
  border-bottom-left-radius: var(--radius-md);
}

.btn-group .btn:last-child {
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
  border-right-width: 1px;
}

.btn-group .btn:not(:first-child):not(:last-child) {
  border-radius: 0;
}

/* ========== LOADING STATE ========== */

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

.btn-loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: var(--radius-full);
  animation: btn-spin 0.6s linear infinite;
}

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

/* ========== SOCIAL BUTTONS ========== */

.btn-facebook {
  color: var(--color-white);
  background-color: #1877f2;
  border-color: #1877f2;
}

.btn-twitter {
  color: var(--color-white);
  background-color: #1da1f2;
  border-color: #1da1f2;
}

.btn-google {
  color: var(--color-white);
  background-color: #ea4335;
  border-color: #ea4335;
}

.btn-linkedin {
  color: var(--color-white);
  background-color: #0a66c2;
  border-color: #0a66c2;
}

.btn-whatsapp {
  color: var(--color-white);
  background-color: #25d366;
  border-color: #25d366;
}

/* ========== SPECIAL EFFECTS ========== */

/* Shimmer effect (para CTAs destacados) */
.btn-shimmer {
  position: relative;
  overflow: hidden;
}

.btn-shimmer::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  transition: left var(--transition-slow);
}

.btn-shimmer:hover::before {
  left: 100%;
}

/* Gradient button */
.btn-gradient {
  color: var(--color-white);
  background: linear-gradient(
    135deg,
    var(--color-primary-600) 0%,
    var(--color-primary-700) 100%
  );
  border: none;
  box-shadow: var(--shadow-md);
}

.btn-gradient:hover {
  background: linear-gradient(
    135deg,
    var(--color-primary-700) 0%,
    var(--color-primary-800) 100%
  );
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Elevated button (3D effect) */
.btn-elevated {
  box-shadow: 0 4px 0 var(--color-primary-700);
  transform: translateY(-2px);
}

.btn-elevated:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 0 var(--color-primary-700);
}

.btn-elevated:active {
  transform: translateY(0);
  box-shadow: 0 2px 0 var(--color-primary-700);
}

/* ========== BUTTON WITH BADGE ========== */

.btn-with-badge {
  position: relative;
}

.btn-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  background-color: var(--color-error);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-white);
}

/* ========== RESPONSIVE ========== */

@media (max-width: 640px) {
  .btn-responsive {
    width: 100%;
    display: flex;
  }
  
  .btn-group {
    flex-direction: column;
  }
  
  .btn-group .btn {
    border-right-width: 1px;
    border-bottom-width: 0;
  }
  
  .btn-group .btn:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }
  
  .btn-group .btn:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    border-bottom-width: 1px;
  }
}

/* ========== LEGACY BOOTSTRAP COMPATIBILITY ========== */

.btn-default {
  color: var(--color-gray-700);
  background-color: var(--color-gray-100);
  border-color: var(--color-gray-300);
}

.btn-default:hover {
  background-color: var(--color-gray-200);
  border-color: var(--color-gray-400);
}

.btn-info {
  color: var(--color-white);
  background-color: var(--color-info);
  border-color: var(--color-info);
}

.btn-info:hover {
  background-color: var(--color-info-dark);
  border-color: var(--color-info-dark);
}

.btn-link {
  color: var(--color-primary-600);
  background-color: transparent;
  border-color: transparent;
  text-decoration: underline;
  box-shadow: none;
}

.btn-link:hover {
  color: var(--color-primary-700);
  text-decoration: none;
  transform: none;
}