/* ENHANCEMENT 2: SEO & Performance CSS */
/* Critical CSS for above-the-fold content */
.hero { will-change: transform; }
.hero-card { will-change: transform; }

/* ENHANCEMENT 3: Accessibility Enhancements */
.sr-only {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10000;
  padding: 1rem 1.5rem;
  background: var(--rose-profond);
  color: white;
  text-decoration: none;
  font-family: var(--font-label);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 3px solid var(--rose-profond);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--rose-profond);
  outline-offset: 2px;
}

/* ENHANCEMENT 4: Animation Enhancements */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.btn-primary:active {
  transform: translateY(0) scale(0.98) !important;
  transition: transform 0.1s ease;
}

/* Smooth transitions for interactive elements */
.problem-card,
.bundle-card,
.testimonial-card,
.flip-card,
.faq-item {
  transition: transform 0.3s var(--ease), 
              box-shadow 0.3s var(--ease),
              border-color 0.3s var(--ease);
}

/* ENHANCEMENT 5: Form Validation Styles */
.field input.valid,
.field textarea.valid,
.field select.valid {
  border-color: rgba(76, 175, 80, 0.5);
  background-color: rgba(76, 175, 80, 0.05);
}

.field input.invalid,
.field textarea.invalid,
.field select.invalid {
  border-color: rgba(244, 67, 54, 0.5);
  background-color: rgba(244, 67, 54, 0.05);
}

.field-error {
  color: #f44336;
  font-size: 0.75rem;
  margin-top: 0.25rem;
  font-family: var(--font-label);
  letter-spacing: 0.05em;
}

.field-success {
  color: #4caf50;
  font-size: 0.75rem;
  margin-top: 0.25rem;
  font-family: var(--font-label);
  letter-spacing: 0.05em;
}

/* Loading state for form submission */
.btn-primary.loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn-primary.loading::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  top: 50%;
  left: 50%;
  margin-left: -10px;
  margin-top: -10px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.6s linear infinite;
}

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

/* Performance: Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn-primary {
    border: 2px solid currentColor;
  }
  
  .problem-card,
  .bundle-card {
    border: 2px solid var(--rose-profond);
  }
}