/* ========================================
   COMPOSANTS BOUTONS MODERNES 2025
   Gradients vifs avec animations et effets 3D
   ======================================== */

/* === BOUTONS DE BASE === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 2rem;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-none);
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  min-height: 44px; /* Touch-friendly */
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.2);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: var(--shadow-sm) !important;
}

/* === EFFET RIPPLE === */
.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::before {
  width: 300px;
  height: 300px;
}

/* === EFFET SHIMMER === */
.btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn:hover::after {
  left: 100%;
}

/* === BOUTONS PRIMAIRES === */
.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-on-primary);
  border-color: transparent;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-primary), var(--shadow-xl);
  color: var(--color-text-on-primary);
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-primary:focus {
  box-shadow: var(--shadow-primary), 0 0 0 4px rgba(79, 70, 229, 0.2);
}

/* === BOUTONS SECONDAIRES === */
.btn-secondary {
  background: var(--gradient-secondary);
  color: var(--color-text-on-primary);
  border-color: transparent;
}

.btn-secondary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-secondary), var(--shadow-xl);
  color: var(--color-text-on-primary);
}

.btn-secondary:active {
  transform: translateY(-1px);
}

.btn-secondary:focus {
  box-shadow: var(--shadow-secondary), 0 0 0 4px rgba(139, 92, 246, 0.2);
}

/* === BOUTONS ACCENT === */
.btn-accent {
  background: var(--gradient-accent);
  color: var(--color-text-on-primary);
  border-color: transparent;
}

.btn-accent:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-accent), var(--shadow-xl);
  color: var(--color-text-on-primary);
}

.btn-accent:active {
  transform: translateY(-1px);
}

.btn-accent:focus {
  box-shadow: var(--shadow-accent), 0 0 0 4px rgba(6, 182, 212, 0.2);
}

/* === BOUTONS SUCCÈS === */
.btn-success {
  background: var(--gradient-success);
  color: var(--color-text-on-primary);
  border-color: transparent;
}

.btn-success:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-success), var(--shadow-xl);
  color: var(--color-text-on-primary);
}

.btn-success:active {
  transform: translateY(-1px);
}

.btn-success:focus {
  box-shadow: var(--shadow-success), 0 0 0 4px rgba(16, 185, 129, 0.2);
}

/* === BOUTONS DANGER === */
.btn-danger {
  background: var(--gradient-danger);
  color: var(--color-text-on-primary);
  border-color: transparent;
}

.btn-danger:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-danger), var(--shadow-xl);
  color: var(--color-text-on-primary);
}

.btn-danger:active {
  transform: translateY(-1px);
}

.btn-danger:focus {
  box-shadow: var(--shadow-danger), 0 0 0 4px rgba(239, 68, 68, 0.2);
}

/* === BOUTONS WARNING === */
.btn-warning {
  background: var(--gradient-warning);
  color: var(--color-text);
  border-color: transparent;
}

.btn-warning:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-warning), var(--shadow-xl);
  color: var(--color-text);
}

.btn-warning:active {
  transform: translateY(-1px);
}

.btn-warning:focus {
  box-shadow: var(--shadow-warning), 0 0 0 4px rgba(245, 158, 11, 0.2);
}

/* === BOUTONS INFO === */
.btn-info {
  background: var(--gradient-info);
  color: var(--color-text-on-primary);
  border-color: transparent;
}

.btn-info:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-info), var(--shadow-xl);
  color: var(--color-text-on-primary);
}

.btn-info:active {
  transform: translateY(-1px);
}

.btn-info:focus {
  box-shadow: var(--shadow-info), 0 0 0 4px rgba(59, 130, 246, 0.2);
}

/* === BOUTONS OUTLINE === */
.btn-outline-primary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline-primary:hover {
  background: var(--gradient-primary);
  color: var(--color-text-on-primary);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-primary), var(--shadow-xl);
}

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

.btn-outline-secondary:hover {
  background: var(--gradient-secondary);
  color: var(--color-text-on-primary);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-secondary), var(--shadow-xl);
}

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

.btn-outline-accent:hover {
  background: var(--gradient-accent);
  color: var(--color-text-on-primary);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-accent), var(--shadow-xl);
}

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

.btn-outline-success:hover {
  background: var(--gradient-success);
  color: var(--color-text-on-primary);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-success), var(--shadow-xl);
}

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

.btn-outline-danger:hover {
  background: var(--gradient-danger);
  color: var(--color-text-on-primary);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-danger), var(--shadow-xl);
}

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

.btn-outline-warning:hover {
  background: var(--gradient-warning);
  color: var(--color-text);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-warning), var(--shadow-xl);
}

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

.btn-outline-info:hover {
  background: var(--gradient-info);
  color: var(--color-text-on-primary);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: var(--shadow-info), var(--shadow-xl);
}

/* === BOUTONS GHOST === */
.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: transparent;
  box-shadow: none;
}

.btn-ghost:hover {
  background: var(--color-surface-hover);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

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

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

/* === TAILLES DE BOUTONS === */
.btn-sm {
  padding: 0.625rem 1.5rem;
  font-size: var(--font-size-sm);
  min-height: 36px;
}

.btn-lg {
  padding: 1.125rem 2.5rem;
  font-size: var(--font-size-lg);
  min-height: 52px;
}

.btn-xl {
  padding: 1.25rem 3rem;
  font-size: var(--font-size-xl);
  min-height: 60px;
}

.btn-2xl {
  padding: 1.5rem 4rem;
  font-size: var(--font-size-2xl);
  min-height: 72px;
}

/* === BOUTONS ICÔNES === */
.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-full);
}

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

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

.btn-icon-xl {
  width: 60px;
  height: 60px;
}

/* === GROUPES DE BOUTONS === */
.btn-group {
  display: inline-flex;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.btn-group .btn {
  border-radius: 0;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: none;
  margin: 0;
}

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

.btn-group .btn:last-child {
  border-top-right-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-lg);
  border-right: none;
}

.btn-group .btn:hover {
  transform: none;
  box-shadow: none;
}

.btn-group:hover {
  box-shadow: var(--shadow-xl);
}

/* === BOUTONS FLOTTANTS === */
.btn-floating {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-fixed);
}

.btn-floating:hover {
  transform: scale(1.1);
}

/* === BOUTONS LOADING === */
.btn-loading {
  position: relative;
  color: transparent !important;
}

.btn-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* === BOUTONS PULSANTS === */
.btn-pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.7);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(79, 70, 229, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(79, 70, 229, 0);
  }
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .btn {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
    width: 100%;
    margin-bottom: var(--space-2);
  }
  
  .btn-group {
    width: 100%;
  }
  
  .btn-group .btn {
    flex: 1;
  }
  
  .btn-floating {
    bottom: 1rem;
    right: 1rem;
    width: 48px;
    height: 48px;
  }
}

/* === ACCESSIBILITÉ === */
@media (prefers-reduced-motion: reduce) {
  .btn,
  .btn::before,
  .btn::after {
    transition: none;
    animation: none;
  }
  
  .btn:hover {
    transform: none;
  }
  
  .btn-loading::after {
    animation: none;
  }
  
  .btn-pulse {
    animation: none;
  }
}

/* Focus visible pour les utilisateurs au clavier */
.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* === BOUTONS SPÉCIAUX === */
.btn-gradient {
  background: linear-gradient(45deg, var(--color-primary), var(--color-secondary), var(--color-accent));
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.btn-neon {
  box-shadow: 
    0 0 5px var(--color-primary),
    0 0 10px var(--color-primary),
    0 0 15px var(--color-primary);
  animation: neonGlow 2s ease-in-out infinite alternate;
}

@keyframes neonGlow {
  from {
    box-shadow: 
      0 0 5px var(--color-primary),
      0 0 10px var(--color-primary),
      0 0 15px var(--color-primary);
  }
  to {
    box-shadow: 
      0 0 10px var(--color-primary),
      0 0 20px var(--color-primary),
      0 0 30px var(--color-primary);
  }
}