/* ===== BUTTONS - ROVI 2025 ===== */
/* Primary, secondary, states, loading, mobile optimizations */

/* ===== BASE BUTTON ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-smooth);
  cursor: pointer;
  text-decoration: none;
  border: none;
  position: relative;
  overflow: hidden;
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
  will-change: transform, box-shadow;
}

/* ===== PRIMARY BUTTON ===== */
.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-text-inverse);
  position: relative;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(234, 95, 71, 0.4);
  border: 2px solid transparent;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--color-highlight) 0%, var(--color-accent) 100%);
  opacity: 0;
  transition: opacity var(--transition-smooth);
  border-radius: inherit;
}

.btn-primary:hover {
  transform: translate3d(0, -4px, 0) scale(1.02);
  box-shadow: 0 12px 30px rgba(234, 95, 71, 0.35);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary:active {
  transform: translate3d(0, -1px, 0) scale(0.98);
  transition: transform 0.1s ease;
}

/* ===== SECONDARY BUTTON ===== */
.btn-secondary {
  background: rgba(255, 255, 255, 0.9);
  color: var(--color-secondary);
  border: 2px solid rgba(255, 255, 255, 0.8);
  position: relative;
  z-index: 1;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.btn-secondary::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-highlight) 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-smooth);
  border-radius: inherit;
  z-index: -1;
}

.btn-secondary:hover {
  color: var(--color-text-inverse);
  transform: translate3d(0, -4px, 0);
  box-shadow: 0 12px 30px rgba(234, 95, 71, 0.25);
  border-color: var(--color-secondary);
}

.btn-secondary:hover::before {
  transform: scaleX(1);
}

.btn-secondary:active {
  transform: translate3d(0, -1px, 0) scale(0.98);
  transition: transform 0.1s ease;
}

/* ===== BUTTON VARIANTS ===== */
.btn-full {
  width: 100%;
  justify-content: center;
}

/* ===== LOADING STATE ===== */
.btn.loading {
  cursor: not-allowed;
  pointer-events: none;
  opacity: 0.7;
}

.btn.loading span {
  opacity: 0;
}

.btn.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1.6rem;
  height: 1.6rem;
  margin: -0.8rem 0 0 -0.8rem;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: button-spin 1s linear infinite;
}

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

/* ===== ERROR STATE ===== */
.btn.error {
  background: linear-gradient(135deg, #FF6B6B 0%, #EE5A52 100%);
  color: white;
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

/* ===== SUCCESS STATE ===== */
.btn.success {
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  color: white;
}

.btn.success::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.2em;
  animation: success-bounce 0.6s ease-out;
}

@keyframes success-bounce {
  0% {
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.2);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
}

/* ===== SKELETON LOADING ===== */
.skeleton {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.1) 25%,
    rgba(255, 255, 255, 0.2) 50%,
    rgba(255, 255, 255, 0.1) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-button {
  height: 4.8rem;
  width: 100%;
}

/* ===== MOBILE BUTTON OPTIMIZATIONS ===== */
@media (max-width: 768px) {
  .btn {
    padding: var(--space-lg) var(--space-xl);
    font-size: var(--font-size-base);
    min-height: 5.2rem;
    border-radius: var(--radius-lg);
    touch-action: manipulation;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    gap: var(--space-md);
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    max-width: 32rem;
    justify-content: center;
    font-weight: var(--font-weight-semibold);
  }

  .btn-primary:hover,
  .btn-secondary:hover {
    transform: translateY(-2px);
  }

  .btn-primary:active,
  .btn-secondary:active {
    transform: translateY(0);
  }

  .btn {
    min-width: 4.4rem;
  }

  .btn:focus {
    outline: 3px solid var(--color-secondary);
    outline-offset: 3px;
  }

  .btn-primary::before,
  .btn-secondary::before {
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
}

@media (max-width: 480px) {
  .btn {
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-sm);
    min-height: 4.8rem;
    gap: var(--space-sm);
  }

  .btn-primary,
  .btn-secondary {
    max-width: 28rem;
  }
}

@media (max-width: 768px) and (orientation: landscape) {
  .btn {
    padding: var(--space-sm) var(--space-lg);
    min-height: 4.4rem;
    font-size: var(--font-size-sm);
  }

  .btn-primary,
  .btn-secondary {
    width: auto;
    min-width: 16rem;
    max-width: 24rem;
  }
}