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

:root {
  --primary-blue: #004aad;
  --secondary-gold: #ffb300;
  --text-dark: #1a1a1a;
  --text-gray: #4a4a4a;
  --text-light: #6a6a6a;
  --bg-light: #f8f9fa;
  --bg-white: #ffffff;
  --border-color: #e0e0e0;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
  --max-width: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--bg-light);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Header Styles */
.site-header {
  background-color: var(--bg-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.logo img {
  width: 50px;
  height: 50px;
  object-fit: contain;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-blue);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.flag {
  font-size: 1.5rem;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-dark);
  cursor: pointer;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  padding: var(--spacing-sm) 0;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-gray);
  font-weight: 500;
  transition: color 0.3s ease;
}

.main-nav a:hover {
  color: var(--primary-blue);
}

/* Hero Section */
.hero {
  background-color: var(--bg-white);
  padding: var(--spacing-xl) 0;
}

.hero-content h1 {
  font-size: 2rem;
  line-height: 1.3;
  color: var(--text-dark);
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-lg);
}

.article-meta i {
  margin-right: var(--spacing-xs);
  color: var(--primary-blue);
}

.hero-image {
  margin-top: var(--spacing-lg);
}

.hero-image img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
}

/* Main Content */
.main-content {
  padding: var(--spacing-xl) 0;
}

.content-wrapper {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

/* Table of Contents */
.toc-sidebar {
  order: 2;
}

.toc-container {
  background-color: var(--bg-white);
  border-radius: 8px;
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.toc-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  width: 100%;
  background-color: var(--primary-blue);
  color: white;
  border: none;
  padding: var(--spacing-sm);
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.toc-toggle:hover {
  background-color: #003a8c;
}

.toc-nav {
  display: none;
  margin-top: var(--spacing-md);
}

.toc-nav.active {
  display: block;
}

.toc-nav ul {
  list-style: none;
}

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

.toc-nav a {
  color: var(--text-gray);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
  display: block;
  padding: var(--spacing-xs) 0;
}

.toc-nav a:hover {
  color: var(--primary-blue);
}

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

/* Article Content */
.article-content {
  background-color: var(--bg-white);
  padding: var(--spacing-xl);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  order: 1;
}

.article-intro {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-gray);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--border-color);
}

.article-content h2 {
  font-size: 1.75rem;
  color: var(--text-dark);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  font-weight: 700;
  line-height: 1.3;
}

.article-content h3 {
  font-size: 1.4rem;
  color: var(--text-dark);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.article-content h4 {
  font-size: 1.2rem;
  color: var(--text-dark);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.article-content p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
  color: var(--text-gray);
}

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

.article-content li {
  margin-bottom: var(--spacing-sm);
  line-height: 1.7;
  color: var(--text-gray);
}

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

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

/* Info Boxes */
.info-box,
.warning-box {
  padding: var(--spacing-md);
  border-radius: 8px;
  margin: var(--spacing-lg) 0;
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.info-box {
  background-color: #e3f2fd;
  border-left: 4px solid var(--primary-blue);
}

.warning-box {
  background-color: #fff3e0;
  border-left: 4px solid var(--secondary-gold);
}

.info-box i,
.warning-box i {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.info-box i {
  color: var(--primary-blue);
}

.warning-box i {
  color: var(--secondary-gold);
}

.info-box p,
.warning-box p {
  margin: 0;
}

/* Table Styles */
.table-responsive {
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-white);
  box-shadow: var(--shadow-sm);
}

thead {
  background-color: var(--primary-blue);
  color: white;
}

th,
td {
  padding: var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  font-weight: 600;
  font-size: 0.9rem;
}

td {
  font-size: 0.9rem;
  color: var(--text-gray);
}

tbody tr:hover {
  background-color: var(--bg-light);
}

/* Author Section */
.author-section {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 2px solid var(--border-color);
}

.author-section h2 {
  margin-top: 0;
}

.author-card {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
  background-color: var(--bg-light);
  padding: var(--spacing-lg);
  border-radius: 8px;
  margin-top: var(--spacing-md);
}

.author-card img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.author-info h3 {
  margin: 0 0 var(--spacing-xs) 0;
  color: var(--text-dark);
}

.author-role {
  color: var(--primary-blue);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.author-bio {
  color: var(--text-gray);
  margin-bottom: var(--spacing-md);
}

.author-social {
  display: flex;
  gap: var(--spacing-sm);
}

.author-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--primary-blue);
  color: white;
  border-radius: 50%;
  text-decoration: none;
  transition: background-color 0.3s ease;
}

.author-social a:hover {
  background-color: #003a8c;
}

/* Footer */
.site-footer {
  background-color: var(--text-dark);
  color: white;
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: var(--spacing-xl);
}

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

.footer-section h4 {
  color: var(--secondary-gold);
  margin-bottom: var(--spacing-sm);
}

.footer-section p {
  color: #ccc;
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-xs);
}

.footer-section a {
  color: #ccc;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-section a:hover {
  color: var(--secondary-gold);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid #444;
  color: #999;
  font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .main-nav {
    display: none;
  }

  .main-nav.active {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

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

  .article-content {
    padding: var(--spacing-md);
  }

  .article-content h2 {
    font-size: 1.5rem;
  }

  .article-content h3 {
    font-size: 1.25rem;
  }

  .author-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .author-card img {
    width: 100px;
    height: 100px;
  }

  table {
    font-size: 0.8rem;
  }

  th,
  td {
    padding: var(--spacing-xs);
  }
}

@media (min-width: 769px) {
  .hero-content h1 {
    font-size: 2.5rem;
  }

  .content-wrapper {
    grid-template-columns: 250px 1fr;
  }

  .toc-sidebar {
    order: 1;
  }

  .article-content {
    order: 2;
  }

  .toc-container {
    position: sticky;
    top: 100px;
  }

  .toc-toggle {
    display: none;
  }

  .toc-nav {
    display: block !important;
  }

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

@media (min-width: 1024px) {
  .hero-content h1 {
    font-size: 3rem;
  }

  .article-content {
    padding: var(--spacing-xl) 3rem;
  }
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

/* Focus Styles for Accessibility */
a:focus,
button:focus {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}