:root {
  --primary-color: #fa5b0f;
  --secondary-color: #ff5100;
  --background-color: #ffffff;
  --surface-color: #f8f9fa;
  --text-color: #212529;
  --heading-color: #000000;
  --border-color: #dee2e6;
  --link-color: #fa5b0f;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --line-height: 1.7;
  --container-width: 1140px;
  --content-width: 800px; 
}
[data-theme="dark"] {
  --primary-color: #fa5b0f;
  --secondary-color: #ff5100;
  --background-color: #121212;
  --surface-color: #1e1e1e;
  --text-color: #e0e0e0;
  --heading-color: #ffffff;
  --border-color: #444;
  --link-color: #fa5b0f;
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: var(--line-height);
  background-color: var(--background-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}
a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.2s ease-in-out;
}
a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
header {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--background-color);
  position: relative; 
  top: 0;
  z-index: 1000;
}
header .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--heading-color);
}
.logo:hover { text-decoration: none; }
.navbar ul,
.language {
  list-style: none;
  display: flex;
  gap: 20px;
}
.navbar a,
.language a {
  font-weight: 500;
  color: var(--secondary-color);
}
.navbar a.active,
.language a.active2 {
  color: var(--primary-color);
  font-weight: bold;
  max-height: fit-content;
}
.navbar a:hover,
.language a:hover {
  color: var(--primary-color);
  text-decoration: none;
}
.hamburger {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
  color: var(--heading-color);
}
#blog-post {
  padding: 40px 0;
}
.blog-content {
  max-width: var(--content-width); 
  margin: 0 auto;
}
.blog-header h1 {
  font-size: 2.5rem;
  color: var(--heading-color);
  line-height: 1.2;
  margin-bottom: 20px;
}
.blog-content h2 {
  font-size: 2rem;
  color: var(--heading-color);
  margin-top: 40px;
  margin-bottom: 15px;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 10px;
}
.blog-content h3 {
  font-size: 1.5rem;
  color: var(--heading-color);
  margin-top: 30px;
  margin-bottom: 10px;
}
.blog-content p {
  margin-bottom: 20px;
  text-align: justify;
  hyphens: auto;
}
.blog-content .author-note {
  margin: 30px 0;
  padding: 15px 20px;
  background-color: var(--surface-color);
  border-left: 5px solid var(--primary-color);
  font-style: italic;
  font-size: 0.95rem;
}
.blog-content .author-note p {
  margin-bottom: 0; 
}
.blog-content strong {
  color: var(--heading-color);
}
.blog-content ul {
  padding-left: 25px;
  margin-bottom: 20px;
}
.blog-content li {
  margin-bottom: 10px;
}
.image-placeholder {
  text-align: center;
  margin: 40px 0;
  padding: 20px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background-color: var(--surface-color);
}
.image-placeholder img {
    border-radius: 5px;
    margin: 0 auto 15px auto;
}
.image-placeholder figcaption {
  font-style: italic;
  color: var(--secondary-color);
  font-size: 0.9rem;
}
.table-container {
  overflow-x: auto;
  margin: 30px 0;
}

.blog-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
.blog-table th, 
.blog-table td {
  border: 1px solid var(--border-color);
  padding: 12px;
  text-align: left;
}
.blog-table th {
  background-color: var(--surface-color);
  font-weight: bold;
  color: var(--heading-color);
}
.blog-table tbody tr:nth-child(even) {
  background-color: var(--surface-color);
}
footer {
  text-align: center;
  padding: 40px 20px;
  margin-top: 40px;
  border-top: 1px solid var(--border-color);
  color: var(--secondary-color);
  font-size: 0.9rem;
}
.renewable-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
}
.renewable-container img {
  width: 24px;
  height: 24px;
}
.theme-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background-color: var(--surface-color);
  color: var(--text-color);
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.2rem;
  z-index: 1001;
  transition: all 0.3s ease;
}
.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
[data-theme="light"] .fa-sun { display: none; }
[data-theme="dark"] .fa-moon { display: none; }

@media (max-width: 768px) {
  .blog-header h1 { font-size: 2rem; }
  .blog-content h2 { font-size: 1.75rem; }
  .hamburger { display: block; }
  .navbar {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 99999; 
  }
  .navbar.active { 
    display: block; 
  }
  .navbar ul {
    flex-direction: column;
    padding: 10px 0;
    gap: 0;
  }
  .navbar li {
    text-align: center;
  }
  .navbar a {
    display: block;
    padding: 15px;
    width: 100%;
  }
  .language {
    gap: 15px;
  }
}