/* PDF Page Picker - Responsive Styles */
/* Mobile First - these are overrides for larger screens */

/* ========================================
   Mobile Navigation
   ======================================== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-md) 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    display: none;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: 0;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
}

/* ========================================
   Mobile Optimizations (< 640px)
   ======================================== */
@media (max-width: 639px) {
  .how-it-works .step-detail {
    padding: var(--spacing-md);
  }

  .use-cases .use-case {
    padding-left: var(--spacing-md);
  }

  .section-intro {
    font-size: 1rem;
  }

  .privacy-verification,
  .technology-note,
  .use-case-summary {
    padding: var(--spacing-md);
    font-size: 0.9rem;
  }

  .nav-logo span {
    display: none;
  }
}

/* ========================================
   Tablet and up (640px+)
   ======================================== */
@media (min-width: 640px) {
  h1 {
    font-size: 3rem;
  }

  .presets {
    grid-template-columns: repeat(5, 1fr);
  }

  .upload-zone {
    padding: 3rem;
  }
}

/* ========================================
   Desktop (1024px+)
   ======================================== */
@media (min-width: 1024px) {
  main {
    padding: var(--spacing-xl) var(--spacing-lg);
  }
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .upload-zone.dragover {
    transform: none;
  }
  
  .faq summary::before {
    transition: none;
  }
}

/* ========================================
   Dark Mode Support
   ======================================== */
@media (prefers-color-scheme: dark) {
  /* Dark mode variables are already defined in main.css */
  /* These are component-specific overrides */

  .privacy-badge {
    background: linear-gradient(135deg, #3B82F6 0%, #2563EB 100%);
    box-shadow:
      0 2px 16px rgba(59, 130, 246, 0.5),
      0 0 16px rgba(59, 130, 246, 0.3);
    border-color: rgba(147, 197, 253, 0.6);
  }

  .privacy-badge:hover {
    box-shadow:
      0 6px 24px rgba(59, 130, 246, 0.6),
      0 0 20px rgba(59, 130, 246, 0.4);
    border-color: rgba(147, 197, 253, 0.8);
  }

  .upload-zone {
    background: var(--color-surface);
    border-color: var(--color-border);
  }

  .upload-zone:hover,
  .upload-zone:focus {
    background: var(--color-brand-deep);
    border-color: var(--color-brand);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15), var(--shadow-lg);
  }

  .btn-preset {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
  }

  .btn-preset:hover {
    background: var(--color-brand-deep);
    border-color: var(--color-brand);
    color: var(--color-brand-light);
  }

  .processing-status.success {
    background: var(--color-success-dark, #064e3b);
    color: var(--color-success-light, #6EE7B7);
  }

  .processing-status.error {
    background: var(--color-error-dark, #7f1d1d);
    color: var(--color-error-light, #FCA5A5);
  }

  .modal-overlay {
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
  }

  .modal-content {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
  }

  .technology-note {
    background: var(--color-bg-alt);
    border-color: var(--color-border);
  }

  .how-it-works .step-detail {
    background: var(--color-bg-alt);
    border-left-color: var(--color-brand);
  }

  .how-it-works .step-detail h3 {
    color: var(--color-brand-light);
  }

  .privacy-verification,
  .use-case-summary {
    background: var(--color-bg-alt);
    border-color: var(--color-border);
  }

  .use-cases .use-case h3 {
    color: var(--color-brand-light);
  }

  .privacy-security h3 {
    color: var(--color-brand-light);
  }

  .faq details {
    background: var(--color-bg-alt);
  }

  .faq details:hover {
    border-color: var(--color-brand);
  }

  header {
    background: linear-gradient(135deg, #1E293B 0%, #1E3A8A 50%, #1E40AF 100%);
  }

  header h1::after {
    background: linear-gradient(90deg,
      var(--color-brand-light) 0%,
      var(--color-accent) 50%,
      var(--color-brand-light) 100%);
    background-size: 200% 100%;              /* keep */
    animation: gradientShift 5s ease-in-out infinite;  /* keep */
    box-shadow:
      0 0 16px rgba(96, 165, 250, 0.5),
      0 0 32px rgba(96, 165, 250, 0.25);
  }

  footer::before {
    opacity: 0.2;
  }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
  header,
  footer,
  .ad-placeholder {
    display: none;
  }
  
  main {
    max-width: 100%;
  }
}