/* CSS Variables for Light/Dark Mode */
:root {
  /* Light mode colors */
  --primary-color: #007bff;
  --primary-hover: #0056b3;
  --text-primary: #333;
  --text-secondary: #555;
  --text-muted: #666;
  --bg-primary: #f8f9fa;
  --bg-secondary: #fff;
  --bg-tertiary: #f8f9fa;
  --border-color: #eee;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  --header-bg: #fff;
  --footer-bg: #333;
  --footer-text: #ccc;
  --footer-text-hover: #fff;
  --footer-separator: #666;
  --code-bg: #f8f9fa;
  --code-color: #e83e8c;
  --blockquote-border: #007bff;
  --table-header-bg: #007bff;
  --table-header-color: #fff;
  --table-row-hover: #f8f9fa;
  --table-border: #eee;
  --gradient-start: #667eea;
  --gradient-end: #764ba2;
  /* Focus colors for light mode */
  --focus-color: #000;
  --focus-bg: rgba(0, 0, 0, 0.1);
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #4dabf7;
    --primary-hover: #74c0fc;
    --text-primary: #e9ecef;
    --text-secondary: #adb5bd;
    --text-muted: #6c757d;
    --bg-primary: #212529;
    --bg-secondary: #343a40;
    --bg-tertiary: #495057;
    --border-color: #495057;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.4);
    --header-bg: #343a40;
    --footer-bg: #212529;
    --footer-text: #adb5bd;
    --footer-text-hover: #e9ecef;
    --footer-separator: #6c757d;
    --code-bg: #495057;
    --code-color: #f8f9fa;
    --blockquote-border: #4dabf7;
    --table-header-bg: #4dabf7;
    --table-header-color: #212529;
    --table-row-hover: #495057;
    --table-border: #495057;
    --gradient-start: #4dabf7;
    --gradient-end: #74c0fc;
  }
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header and Navigation */
header {
  background-color: var(--header-bg);
  box-shadow: 0 2px 4px var(--shadow-color);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
}

nav {
  padding: 1rem 0;
  width: 100%;
  position: relative;
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: none;
  padding: 0 2rem;
  position: relative;
  z-index: 1001;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
  text-decoration: none;
  display: grid;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.logo svg {
  width: 190px;
  height: auto;
  fill: var(--text-primary);
  transition: fill 0.3s ease;
  display: block;
  overflow: visible;
}

.logo:hover svg {
  fill: var(--text-secondary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  margin-left: auto;
}

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

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

/* Mobile menu toggle button */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  padding: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: 4px;
  position: relative;
}

.mobile-menu-toggle:hover {
  background: var(--bg-tertiary);
}

.mobile-menu-toggle.active {
  background: var(--bg-tertiary);
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.hamburger-icon {
  opacity: 1;
  transform: scale(1);
}

.close-icon {
  position: absolute;
  opacity: 0;
  transform: scale(0.8);
}

.mobile-menu-toggle.active .hamburger-icon {
  opacity: 0;
  transform: scale(0.8);
}

.mobile-menu-toggle.active .close-icon {
  opacity: 1;
  transform: scale(1);
}

/* Main content */
main {
  min-height: calc(100vh - 140px);
  padding: 2rem 0;
}

/* Hero section */
.hero {
  text-align: center;
  padding: 4rem 0;
  background: linear-gradient(
    135deg,
    var(--gradient-start) 0%,
    var(--gradient-end) 100%
  );
  color: white;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* Content sections */
.content-section {
  background: var(--bg-secondary);
  padding: 3rem;
  border-radius: 8px;
  box-shadow: 0 2px 10px var(--shadow-color);
  margin-bottom: 2rem;
}

.content-section h2 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-size: 2rem;
}

.content-section p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

/* Footer */
footer {
  background-color: var(--footer-bg);
  color: white;
  padding: 2rem 0;
  margin-top: auto;
  width: 100%;
}

.footer-content {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  width: 100%;
  max-width: none;
  padding: 0 2rem;
}

.footer-main p {
  margin: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.footer-links ul {
  display: flex;
  list-style: none;
  gap: 1rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

.footer-links li {
  margin: 0;
  padding: 0;
}

.footer-links a {
  color: var(--footer-text);
  text-decoration: none;
  transition: color 0.3s ease;
  font-size: 0.9rem;
}

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

/* Markdown Content Styling */
.markdown-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}

.markdown-content h1 {
  font-size: 3rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-align: left;
  background: linear-gradient(
    135deg,
    var(--gradient-start) 0%,
    var(--gradient-end) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.markdown-content h2 {
  font-size: 2.2rem;
  color: var(--text-primary);
  margin: 2rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--primary-color);
}

.markdown-content h3 {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin: 1.5rem 0 0.5rem 0;
}

.markdown-content p {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.markdown-content ul,
.markdown-content ol {
  margin: 1rem 0;
  padding-left: 2rem;
}

.markdown-content li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

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

.markdown-content code {
  background-color: var(--code-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  color: var(--code-color);
}

.markdown-content blockquote {
  border-left: 4px solid var(--blockquote-border);
  padding-left: 1rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-muted);
}

.markdown-content hr {
  border: none;
  border-top: 2px solid var(--border-color);
  margin: 2rem 0;
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background: var(--bg-secondary);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 10px var(--shadow-color);
}

/* Responsive table improvements */
@media (max-width: 768px) {
  .markdown-content table {
    margin: 1rem 0;
  }

  .markdown-content th,
  .markdown-content td {
    padding: 0.75rem 0.5rem;
  }

  .markdown-content th:first-child,
  .markdown-content td:first-child {
    min-width: 80px;
    max-width: 100px;
  }

  .markdown-content th:last-child,
  .markdown-content td:last-child {
    min-width: 70px;
    max-width: 90px;
  }
}

@media (max-width: 480px) {
  .markdown-content th,
  .markdown-content td {
    padding: 0.5rem 0.25rem;
  }

  .markdown-content th:first-child,
  .markdown-content td:first-child {
    min-width: 60px;
    max-width: 80px;
  }

  .markdown-content th:last-child,
  .markdown-content td:last-child {
    min-width: 60px;
    max-width: 80px;
  }
}

.markdown-content th {
  background-color: var(--table-header-bg);
  color: var(--table-header-color);
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

.markdown-content td {
  padding: 1rem;
  border-bottom: 1px solid var(--table-border);
  color: var(--text-secondary);
}

.markdown-content tr:hover {
  background-color: var(--table-row-hover);
}

.markdown-content a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

.markdown-content a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Image styling */
.markdown-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 12px var(--shadow-color);
  margin: 2rem auto;
  display: block;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.markdown-content img:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow-hover);
}

/* Center images by default */
.markdown-content img {
  margin-left: auto;
  margin-right: auto;
}

/* Responsive image grid for consecutive images */
.markdown-content .image-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 2rem 0;
}

.markdown-content .image-grid img {
  margin: 0;
  width: 100%;
  height: auto;
}

/* Two-column layout for larger screens */
@media (min-width: 768px) {
  .markdown-content .image-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
}

/* Responsive image containers */
.markdown-content .image-container {
  text-align: center;
  margin: 2rem 0;
}

.markdown-content .image-container img {
  margin: 0;
}

/* Image captions */
.markdown-content .image-caption {
  text-align: center;
  font-style: italic;
  color: var(--text-muted);
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .content-section {
    padding: 2rem;
  }

  .container {
    padding: 0 15px;
  }

  nav .container {
    padding: 0 1rem;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
    padding: 0 1rem;
  }

  .footer-links {
    justify-content: center;
    margin-left: 0;
  }

  /* Responsive headline sizes */
  .markdown-content h1 {
    font-size: 2.5rem;
  }

  .markdown-content h2 {
    font-size: 1.8rem;
  }

  .markdown-content h3 {
    font-size: 1.5rem;
  }

  .markdown-content h4 {
    font-size: 1.3rem;
  }

  .markdown-content h5 {
    font-size: 1.1rem;
  }

  .markdown-content h6 {
    font-size: 1rem;
  }
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-secondary);
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    padding: 0;
    box-shadow: 0 4px 10px var(--shadow-color);
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }

  .nav-links.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-links li {
    width: 100%;
    margin: 0;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .nav-links a {
    display: block;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    text-align: left;
    transition: background-color 0.3s ease;
  }

  .nav-links a:hover {
    background-color: var(--bg-tertiary);
  }
}

@media (max-width: 480px) {
  main {
    padding: 1rem 0;
  }

  .hero {
    padding: 2rem 0;
  }

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

  .content-section {
    padding: 1.5rem;
  }

  nav .container {
    padding: 0 0.5rem;
  }

  .footer-content {
    padding: 0 0.5rem;
  }

  /* Responsive headline sizes for very small screens */
  .markdown-content h1 {
    font-size: 2rem;
  }

  .markdown-content h2 {
    font-size: 1.6rem;
  }

  .markdown-content h3 {
    font-size: 1.3rem;
  }

  .markdown-content h4 {
    font-size: 1.1rem;
  }

  .markdown-content h5 {
    font-size: 1rem;
  }

  .markdown-content h6 {
    font-size: 0.9rem;
  }
}

@media (max-width: 420px) {
  .footer-links ul {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
  }

  .footer-links li {
    text-align: center;
  }
  .nav-links {
    gap: 0rem;
  }
  .logo svg {
    width: 160px;
  }
}

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