/* ============================================
   TABEL HITUNGAN ORANG MENINGGAL - STYLES
   Modern, Responsive, Optimized for Core Web Vitals
   ============================================ */

/* CSS Variables - Design System */
:root {
  /* Color Palette - White Primary Theme */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-color: #667eea;
  --accent-hover: #5568d3;
  --whatsapp-green: #25D366;
  --whatsapp-hover: #20BA5A;

  /* Light Mode Colors (White Primary) */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --bg-glass: rgba(255, 255, 255, 0.9);
  --bg-card: rgba(255, 255, 255, 0.95);

  /* Text Colors */
  --text-primary: #1a1a2e;
  --text-secondary: #4a4a5e;
  --text-muted: #6b6b7e;
  --text-highlight: #667eea;

  /* Spacing Scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Poppins', 'Inter', sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;

  /* Sizes */
  --max-width: 1200px;
  --border-radius: 12px;
  --border-radius-lg: 20px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);

  /* Transitions */
  --transition-fast: 200ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@600;700;800&display=swap');

/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
}

p {
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: var(--shadow-sm);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo svg {
  width: 32px;
  height: 32px;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: width var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a:hover::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
  padding: var(--space-2xl) 0;
  text-align: center;
  position: relative;
}

.hero h1 {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Calculator Card - Glassmorphism */
.calculator-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  margin: var(--space-xl) auto;
  max-width: 800px;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.calculator-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.calculator-input-group {
  margin-bottom: var(--space-lg);
}

.calculator-input-group label {
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
  font-weight: 600;
}

.calculator-input-group input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: rgba(0, 0, 0, 0.03);
  border: 1px solid rgba(0, 0, 0, 0.15);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-mono);
  transition: all var(--transition-fast);
}

.calculator-input-group input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
  background: white;
}

.btn-calculate {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--border-radius);
  color: white;
  font-size: 1.125rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.btn-calculate:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-calculate:active {
  transform: translateY(0);
}

/* Calculator Results */
.calculator-results {
  margin-top: var(--space-lg);
  display: none;
}

.calculator-results.active {
  display: block;
  animation: fadeInUp 0.5s ease;
}

.calculator-results h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.calculator-results p {
  font-size: 0.95rem;
  margin-bottom: var(--space-md);
}

.result-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-md);
  background: white;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.result-table th,
.result-table td {
  padding: 0.625rem 0.875rem;
  text-align: left;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  font-size: 0.9rem;
}

.result-table th {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.result-table td {
  color: var(--text-secondary);
  line-height: 1.4;
}

.result-table tr:hover {
  background: rgba(102, 126, 234, 0.03);
}

/* Article Section */
.article-section {
  padding: var(--space-2xl) 0;
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
}

/* Table of Contents */
.toc-wrapper {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  margin-bottom: var(--space-xl);
  box-shadow: var(--shadow-sm);
}

.toc-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.toc-toggle h3 {
  margin: 0;
  font-size: 1.25rem;
}

.toc-icon {
  transition: transform var(--transition-fast);
  color: var(--text-secondary);
}

.toc-icon.active {
  transform: rotate(180deg);
}

.toc-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.toc-content.active {
  max-height: 500px;
  margin-top: var(--space-md);
}

.toc-content ul {
  list-style: none;
  padding-left: var(--space-md);
}

.toc-content li {
  margin-bottom: var(--space-xs);
}

.toc-content a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.toc-content a:hover {
  color: var(--accent-color);
}

/* Content Styling */
.article-content h2 {
  margin-top: var(--space-xl);
  padding-top: var(--space-md);
  border-top: 2px solid rgba(0, 0, 0, 0.08);
}

.article-content h3 {
  margin-top: var(--space-lg);
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
  color: var(--text-secondary);
}

.article-content li {
  margin-bottom: var(--space-xs);
}

/* Blockquote - Highlight */
blockquote {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
  backdrop-filter: blur(20px);
  border-left: 4px solid var(--accent-color);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  border-radius: var(--border-radius);
  font-style: italic;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* Highlight Box */
.highlight-box {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);
  border: 1px solid rgba(102, 126, 234, 0.2);
  border-radius: var(--border-radius);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  box-shadow: var(--shadow-sm);
}

.highlight-box h4 {
  color: var(--text-highlight);
  margin-bottom: var(--space-sm);
}

/* Table Styling */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  background: white;
  backdrop-filter: blur(20px);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: var(--shadow-sm);
}

table th,
table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

table th {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  color: var(--text-primary);
  font-weight: 600;
}

table td {
  color: var(--text-secondary);
}

table tr:hover {
  background: rgba(102, 126, 234, 0.03);
}

/* Related Articles */
.related-articles {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 2px solid rgba(0, 0, 0, 0.08);
}

.related-articles h2 {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.related-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-color);
}

.related-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.related-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Sources Section */
.sources {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.sources h3 {
  margin-bottom: var(--space-md);
}

.sources ol {
  color: var(--text-secondary);
}

.sources a {
  word-break: break-all;
}

/* Footer */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-xl) 0 var(--space-md);
  margin-top: var(--space-2xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.footer-section h4 {
  margin-bottom: var(--space-md);
  font-size: 1.125rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-xs);
}

.footer-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-color);
}

.footer-disclaimer {
  background: rgba(255, 193, 7, 0.1);
  border: 1px solid rgba(255, 193, 7, 0.3);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-md);
}

.footer-disclaimer p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

.footer-disclaimer strong {
  color: var(--text-primary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--primary-gradient);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

/* Breadcrumb */
.breadcrumb {
  padding: var(--space-md) 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb span {
  margin: 0 var(--space-xs);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

/* ============================================
   RESPONSIVE DESIGN - ENHANCED
   ============================================ */

/* Extra Small Devices (Phones, 320px - 480px) */
@media (max-width: 480px) {
  :root {
    --space-xs: 0.375rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.25rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --border-radius: 8px;
    --border-radius-lg: 12px;
  }

  html {
    font-size: 14px;
  }

  body {
    overflow-x: hidden;
  }

  /* Container */
  .container {
    padding: 0 var(--space-sm);
  }

  /* Header & Navigation */
  header {
    position: sticky;
  }

  nav {
    padding: var(--space-xs) var(--space-sm);
  }

  .logo {
    font-size: 1rem;
    gap: 0.5rem;
  }

  .logo svg {
    width: 24px;
    height: 24px;
  }

  .menu-toggle {
    display: flex;
    z-index: 1001;
  }

  .nav-links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-sm);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: var(--shadow-md);
    max-height: calc(100vh - 56px);
    overflow-y: auto;
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links li {
    width: 100%;
    text-align: center;
    padding: var(--space-xs) 0;
  }

  .nav-links a {
    display: block;
    padding: var(--space-sm);
    font-size: 1rem;
  }

  /* Hero Section */
  .hero {
    padding: var(--space-lg) 0;
  }

  .hero h1 {
    font-size: 1.75rem;
    margin-bottom: var(--space-sm);
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: var(--space-md);
  }

  /* Calculator Card */
  .calculator-card {
    padding: var(--space-md);
    margin: var(--space-md) auto;
  }

  .calculator-card h2 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
  }

  .calculator-input-group {
    margin-bottom: var(--space-md);
  }

  .calculator-input-group label {
    font-size: 0.9rem;
  }

  .calculator-input-group input {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.9rem;
  }

  .btn-calculate {
    padding: var(--space-sm) var(--space-md);
    font-size: 1rem;
  }

  /* Results */
  .calculator-results h3 {
    font-size: 1.125rem;
  }

  .calculator-results p {
    font-size: 0.875rem;
  }

  /* Table Responsiveness - Horizontal Scroll */
  .result-table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
  }

  .result-table thead,
  .result-table tbody,
  .result-table tr {
    display: table;
    width: 100%;
    table-layout: fixed;
  }

  .result-table th,
  .result-table td {
    padding: 0.5rem;
    font-size: 0.8rem;
  }

  /* WhatsApp Button */
  .btn-share-wa {
    padding: 0.75rem 1.25rem;
    font-size: 0.9rem;
    gap: 0.5rem;
    margin-top: var(--space-md);
  }

  .btn-share-wa svg {
    width: 20px;
    height: 20px;
  }

  /* Article Section */
  .article-section {
    padding: var(--space-lg) 0;
  }

  .article-content h1 {
    font-size: 1.5rem;
  }

  .article-content h2 {
    font-size: 1.25rem;
    margin-top: var(--space-md);
  }

  .article-content h3 {
    font-size: 1.125rem;
  }

  .article-content p,
  .article-content li {
    font-size: 0.9rem;
  }

  /* Table of Contents */
  .toc-wrapper {
    padding: var(--space-sm);
  }

  .toc-toggle h3 {
    font-size: 1rem;
  }

  .toc-content {
    font-size: 0.875rem;
  }

  /* Tables in Content */
  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.85rem;
  }

  table th,
  table td {
    padding: var(--space-xs) var(--space-sm);
    white-space: nowrap;
  }

  /* Blockquote */
  blockquote {
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-md) 0;
    font-size: 0.9rem;
  }

  /* Highlight Box */
  .highlight-box {
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-md) 0;
  }

  .highlight-box h4 {
    font-size: 1rem;
  }

  /* Related Articles */
  .related-articles {
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
  }

  .related-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .related-card {
    padding: var(--space-md);
  }

  .related-card h3 {
    font-size: 1.125rem;
  }

  .related-card p {
    font-size: 0.85rem;
  }

  /* Sources */
  .sources {
    padding: var(--space-md);
    font-size: 0.85rem;
  }

  .sources h3 {
    font-size: 1.125rem;
  }

  /* Footer */
  footer {
    padding: var(--space-lg) 0 var(--space-sm);
  }

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

  .footer-section h4 {
    font-size: 1rem;
  }

  .footer-links {
    font-size: 0.9rem;
  }

  .footer-disclaimer {
    padding: var(--space-sm);
    margin-top: var(--space-md);
  }

  .footer-disclaimer p {
    font-size: 0.8rem;
  }

  .footer-bottom {
    font-size: 0.8rem;
  }

  /* Back to Top */
  .back-to-top {
    width: 44px;
    height: 44px;
    bottom: 1rem;
    right: 1rem;
    font-size: 1.25rem;
  }

  /* Article Image */
  .article-image {
    margin: var(--space-md) 0 !important;
  }

  .article-image img {
    border-radius: 8px !important;
  }
}

/* Small Devices (Tablets, 481px - 768px) */
@media (min-width: 481px) and (max-width: 768px) {
  :root {
    --space-xl: 2rem;
    --space-2xl: 2.5rem;
  }

  html {
    font-size: 15px;
  }

  /* Container */
  .container {
    padding: 0 var(--space-md);
  }

  /* Navigation */
  .menu-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: var(--shadow-md);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-links li {
    text-align: center;
  }

  /* Hero */
  .hero {
    padding: var(--space-xl) 0;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  /* Calculator */
  .calculator-card {
    padding: var(--space-lg);
  }

  /* Tables */
  .result-table,
  table {
    font-size: 0.9rem;
  }

  .result-table th,
  .result-table td,
  table th,
  table td {
    padding: 0.625rem 0.75rem;
  }

  /* Related Grid */
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  /* Footer */
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }

  .back-to-top {
    bottom: 1.5rem;
    right: 1.5rem;
  }
}

/* Medium Devices (Small Laptops, 769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-content {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Large Devices (Desktops, 1025px - 1440px) */
@media (min-width: 1025px) and (max-width: 1440px) {
  .container {
    max-width: 1140px;
  }
}

/* Extra Large Devices (Large Desktops, 1441px+) */
@media (min-width: 1441px) {
  :root {
    --max-width: 1400px;
  }

  html {
    font-size: 18px;
  }

  .container {
    max-width: var(--max-width);
  }
}

/* Landscape Orientation Adjustments */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding: var(--space-md) 0;
  }

  .nav-links {
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }

  .calculator-card {
    margin: var(--space-md) auto;
  }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {

  /* Increase touch targets */
  .nav-links a,
  .btn-calculate,
  .btn-share-wa,
  .related-card,
  .back-to-top {
    min-height: 44px;
    min-width: 44px;
  }

  /* Remove hover effects on touch devices */
  .calculator-card:hover,
  .related-card:hover {
    transform: none;
  }

  /* Optimize table scrolling */
  .result-table,
  table {
    -webkit-overflow-scrolling: touch;
  }
}

/* Print Optimizations */
@media print {

  /* Hide interactive elements */
  .btn-share-wa,
  .back-to-top,
  header,
  footer,
  .menu-toggle,
  .toc-toggle,
  .nav-links {
    display: none !important;
  }

  /* Optimize for print */
  body {
    background: white;
    color: black;
    font-size: 12pt;
  }

  .calculator-card,
  .article-content,
  .sources {
    box-shadow: none;
    border: 1px solid #000;
  }

  /* Ensure tables fit */
  table,
  .result-table {
    page-break-inside: avoid;
  }

  /* Show URLs for links */
  a[href]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}


/* WhatsApp Share Button - Enhanced */
.btn-share-wa {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-top: var(--space-lg);
  padding: 1rem 2rem;
  background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
  border: none;
  border-radius: 50px;
  color: white;
  font-size: 1.125rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 8px 24px rgba(37, 211, 102, 0.35),
    0 4px 12px rgba(18, 140, 126, 0.2);
  position: relative;
  overflow: hidden;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  animation: pulseGlow 2s ease-in-out infinite;
}

.btn-share-wa::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s;
}

.btn-share-wa:hover::before {
  left: 100%;
}

.btn-share-wa:hover {
  background: linear-gradient(135deg, #128C7E 0%, #075E54 100%);
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 32px rgba(37, 211, 102, 0.5),
    0 8px 16px rgba(18, 140, 126, 0.3),
    0 0 40px rgba(37, 211, 102, 0.2);
  animation: none;
}

.btn-share-wa:active {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 16px rgba(37, 211, 102, 0.4);
}

.btn-share-wa svg {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
  transition: transform 0.3s ease;
}

.btn-share-wa:hover svg {
  transform: rotate(15deg) scale(1.1);
}

@keyframes pulseGlow {

  0%,
  100% {
    box-shadow: 0 8px 24px rgba(37, 211, 102, 0.35),
      0 4px 12px rgba(18, 140, 126, 0.2);
  }

  50% {
    box-shadow: 0 8px 24px rgba(37, 211, 102, 0.5),
      0 4px 12px rgba(18, 140, 126, 0.3),
      0 0 30px rgba(37, 211, 102, 0.15);
  }
}


/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus Styles */
*:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Performance Optimizations */
.will-change-transform {
  will-change: transform;
}

.gpu-accelerated {
  transform: translateZ(0);
  backface-visibility: hidden;
}