/**
 * Veterina.cz Article Design System
 * Clean, modern design inspired by contemporary SaaS landing pages
 * Color scheme: Orange accent (#FF6B35), white cards, professional typography
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
  /* Colors - Orange Theme */
  --orange-primary: #FF6B35;
  --orange-light: #FF8C61;
  --orange-bg: #FFF4F0;
  --orange-border: #FFD4C4;

  /* Neutral Colors */
  --gray-900: #111827;
  --gray-800: #1F2937;
  --gray-700: #374151;
  --gray-600: #4B5563;
  --gray-500: #6B7280;
  --gray-400: #9CA3AF;
  --gray-300: #D1D5DB;
  --gray-200: #E5E7EB;
  --gray-100: #F3F4F6;
  --gray-50: #F9FAFB;

  /* Layout */
  --max-width-content: 800px;
  --max-width-wide: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Borders & Shadows */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* ============================================
   Reading Progress Bar
   ============================================ */
.article-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--orange-primary);
  transform-origin: 0 0;
  transform: scaleX(0);
  z-index: 9999;
  transition: transform 0.1s ease-out;
}

/* ============================================
   Article Layout & Grid
   ============================================ */
.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

@media (min-width: 1280px) {
  .article-layout {
    grid-template-columns: minmax(0, 1fr) 280px;
  }
}

/* ============================================
   Article Content Container
   ============================================ */
.article-content {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  line-height: var(--line-height-relaxed);
  color: var(--gray-800);
  max-width: var(--max-width-content);
}

/* ============================================
   Typography - Headings
   ============================================ */
.article-content h1 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--gray-900);
  margin-top: 0;
  margin-bottom: var(--spacing-xl);
}

.article-content h2 {
  font-size: 2rem;
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--gray-900);
  margin-top: var(--spacing-3xl);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--gray-200);
  scroll-margin-top: 100px;
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content h3 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--gray-900);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  scroll-margin-top: 100px;
}

.article-content h4 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: var(--line-height-normal);
  color: var(--gray-900);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.article-content h5,
.article-content h6 {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: var(--line-height-normal);
  color: var(--gray-900);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   Typography - Body Text
   ============================================ */
.article-content p {
  margin-bottom: var(--spacing-lg);
  color: var(--gray-700);
}

.article-content p:last-child {
  margin-bottom: 0;
}

.article-content strong {
  font-weight: 600;
  color: var(--gray-900);
}

.article-content em {
  font-style: italic;
}

.article-content a {
  color: var(--orange-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.2s ease;
}

.article-content a:hover {
  color: var(--orange-light);
}

/* ============================================
   Lists
   ============================================ */
.article-content ul {
  list-style: none;
  margin: var(--spacing-lg) 0;
  padding-left: 0;
}

.article-content ul li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: var(--spacing-sm);
  color: var(--gray-700);
}

.article-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 6px;
  height: 6px;
  background: var(--orange-primary);
  border-radius: 50%;
}

.article-content ol {
  list-style: none;
  counter-reset: item;
  margin: var(--spacing-lg) 0;
  padding-left: 0;
}

.article-content ol li {
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: var(--spacing-sm);
  counter-increment: item;
  color: var(--gray-700);
}

.article-content ol li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  background: var(--orange-primary);
  color: white;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 50%;
}

/* Nested lists */
.article-content ul ul,
.article-content ol ul,
.article-content ul ol,
.article-content ol ol {
  margin-top: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   Blockquotes
   ============================================ */
.article-content blockquote {
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  background: var(--gray-50);
  border-left: 4px solid var(--orange-primary);
  border-radius: var(--radius-md);
}

.article-content blockquote p {
  margin-bottom: 0;
  color: var(--gray-700);
  font-size: 1.125rem;
  font-style: italic;
}

.article-content blockquote p:not(:last-child) {
  margin-bottom: var(--spacing-md);
}

/* ============================================
   Code Blocks
   ============================================ */
.article-content code {
  font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
  font-size: 0.875em;
  background: var(--gray-100);
  color: var(--gray-800);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

.article-content pre {
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg);
  background: var(--gray-900);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.article-content pre code {
  background: transparent;
  color: var(--gray-100);
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.5;
}

/* ============================================
   Images & Figures
   ============================================ */
.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  margin: var(--spacing-xl) 0;
  box-shadow: var(--shadow-lg);
}

.article-content figure {
  margin: var(--spacing-xl) 0;
}

.article-content figcaption {
  margin-top: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--gray-600);
  text-align: center;
  font-style: italic;
}

/* ============================================
   Horizontal Rules
   ============================================ */
.article-content hr {
  margin: var(--spacing-2xl) 0;
  border: 0;
  border-top: 1px solid var(--gray-200);
}

/* ============================================
   Tables
   ============================================ */
.article-content table {
  width: 100%;
  margin: var(--spacing-xl) 0;
  border-collapse: collapse;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.article-content th {
  background: var(--gray-50);
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--gray-900);
  border-bottom: 2px solid var(--gray-200);
}

.article-content td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
  color: var(--gray-700);
}

.article-content tr:last-child td {
  border-bottom: none;
}

.article-content tr:hover td {
  background: var(--gray-50);
}

/* ============================================
   Table of Contents (Sticky)
   ============================================ */
.article-toc {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}

@media (min-width: 1280px) {
  .article-toc {
    position: sticky;
    top: 100px;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }
}

.article-toc h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: 0 0 var(--spacing-md);
}

.article-toc nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-toc nav ul ul {
  margin-left: var(--spacing-md);
  margin-top: var(--spacing-xs);
}

.article-toc nav li {
  margin-bottom: var(--spacing-xs);
}

.article-toc nav a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--gray-600);
  text-decoration: none;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.article-toc nav a:hover {
  background: var(--gray-50);
  color: var(--gray-900);
}

.article-toc nav a[aria-current="true"] {
  background: var(--orange-bg);
  color: var(--orange-primary);
  font-weight: 600;
  border-left: 3px solid var(--orange-primary);
}

/* ============================================
   Feature Cards (OUR FEATURE section style)
   ============================================ */
.va-feature-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: #F5E6D3;
  color: var(--gray-700);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 6px;
  margin-bottom: var(--spacing-md);
}

.va-feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin: var(--spacing-2xl) 0;
}

@media (min-width: 768px) {
  .va-feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.va-feature-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

.va-feature-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.va-feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: 0 0 var(--spacing-sm);
}

.va-feature-card p {
  font-size: 1rem;
  color: var(--gray-600);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* ============================================
   Info/Warning/Success Boxes
   ============================================ */
.va-box {
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin: var(--spacing-xl) 0;
  border-left: 4px solid;
}

.va-box--info {
  background: #EFF6FF;
  border-color: #3B82F6;
  color: #1E40AF;
}

.va-box--warning {
  background: #FFFBEB;
  border-color: #F59E0B;
  color: #92400E;
}

.va-box--success {
  background: #F0FDF4;
  border-color: #10B981;
  color: #065F46;
}

.va-box--danger {
  background: #FEF2F2;
  border-color: #EF4444;
  color: #991B1B;
}

.va-box h4 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  font-size: 1.125rem;
}

.va-box p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Emergency Card
   ============================================ */
.va-emergency-card {
  background: linear-gradient(135deg, #FEF2F2 0%, #FEE2E2 100%);
  border: 2px solid #FCA5A5;
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-2xl) 0;
  box-shadow: var(--shadow-lg);
}

.va-emergency-card h2 {
  color: #DC2626;
  font-size: 1.5rem;
  margin: 0 0 var(--spacing-md);
  border-bottom: none;
  padding-bottom: 0;
}

.va-emergency-card p {
  color: #991B1B;
  margin-bottom: var(--spacing-md);
}

.va-emergency-card ul {
  margin: var(--spacing-md) 0;
}

.va-emergency-card ul li {
  color: #991B1B;
  font-weight: 500;
}

.va-emergency-card ul li::before {
  background: #DC2626;
}

/* ============================================
   FAQ Accordion
   ============================================ */
.va-faq {
  margin: var(--spacing-2xl) 0;
}

.va-faq details {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
  transition: all 0.3s ease;
}

.va-faq details:hover {
  border-color: var(--gray-300);
}

.va-faq summary {
  padding: var(--spacing-lg);
  font-weight: 600;
  color: var(--gray-900);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.2s ease;
  user-select: none;
}

.va-faq summary::-webkit-details-marker {
  display: none;
}

.va-faq summary::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--orange-primary);
  transition: transform 0.2s ease;
}

.va-faq details[open] summary {
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.va-faq details[open] summary::after {
  content: '−';
}

.va-faq summary:hover {
  background: var(--gray-50);
}

.va-faq .va-faq-content {
  padding: var(--spacing-lg);
  color: var(--gray-700);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   Buttons & CTAs
   ============================================ */
.va-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.va-btn--primary {
  background: var(--orange-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.va-btn--primary:hover {
  background: var(--orange-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.va-btn--secondary {
  background: white;
  color: var(--orange-primary);
  border: 2px solid var(--orange-primary);
}

.va-btn--secondary:hover {
  background: var(--orange-bg);
}

/* ============================================
   Chips/Tags
   ============================================ */
.va-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: var(--spacing-lg) 0;
}

.va-chips a,
.va-chip {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--orange-bg);
  color: var(--orange-primary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid var(--orange-border);
  transition: all 0.2s ease;
}

.va-chips a:hover,
.va-chip:hover {
  background: var(--orange-primary);
  color: white;
  transform: translateY(-1px);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
  .article-content {
    font-size: 1rem;
  }

  .article-content h1 {
    font-size: 2rem;
  }

  .article-content h2 {
    font-size: 1.5rem;
    margin-top: var(--spacing-xl);
    scroll-margin-top: 80px;
  }

  .article-content h3 {
    font-size: 1.25rem;
    margin-top: var(--spacing-lg);
    scroll-margin-top: 80px;
  }

  .article-toc {
    margin-bottom: var(--spacing-lg);
  }

  .va-feature-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .article-toc,
  .article-progress,
  .va-btn {
    display: none !important;
  }

  .article-content {
    max-width: 100%;
    box-shadow: none;
  }

  .article-content a {
    color: var(--gray-900);
    text-decoration: underline;
  }

  .article-content a::after {
    content: " (" attr(href) ")";
    font-size: 0.875rem;
    color: var(--gray-600);
  }

  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }

  p, li, blockquote {
    orphans: 3;
    widows: 3;
  }
}

/* ============================================
   Accessibility
   ============================================ */
*:focus-visible {
  outline: 3px solid var(--orange-primary);
  outline-offset: 2px;
}

.skip-to-content {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--orange-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
  text-decoration: none;
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 10000;
  font-weight: 600;
}

.skip-to-content:focus {
  top: 0;
}

/* ============================================
   Utilities
   ============================================ */
.va-text-center {
  text-align: center;
}

.va-text-muted {
  color: var(--gray-600);
}

.va-mt-0 { margin-top: 0 !important; }
.va-mb-0 { margin-bottom: 0 !important; }