:root {
  --background-color-light: #ffffff;
  --text-color-light: #333333;
  --primary-color-light: #007bff;
  --secondary-color-light: #6c757d;
  --border-color-light: #dee2e6;
  --background-color-dark: #212529;
  --text-color-dark: #f8f9fa;
  --primary-color-dark: #0d6efd;
  --secondary-color-dark: #adb5bd;
  --border-color-dark: #495057;
}

body {
  font-family: 'Noto Sans KR', sans-serif;
  line-height: 1.8;
  margin: 0;
  background-color: var(--background-color-light);
  color: var(--text-color-light);
  transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
  background-color: var(--background-color-dark);
  color: var(--text-color-dark);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    font-family: 'Noto Sans KR', sans-serif; /* Ensure headings also use Noto Sans KR */
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color-light);
}

body.dark-mode header {
  border-color: var(--border-color-dark);
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.logo a {
    text-decoration: none;
    color: var(--text-color-light);
}

body.dark-mode .logo a {
    color: var(--text-color-dark);
}

.logo h1 {
    font-size: 1.8rem;
    margin: 0;
}

.subtitle {
    font-size: 0.9rem;
    color: var(--secondary-color-light);
    margin: 0;
}

body.dark-mode .subtitle {
    color: var(--secondary-color-dark);
}

nav a {
    margin: 0 0.5rem;
    text-decoration: none;
    color: var(--text-color-light);
    font-size: 0.9rem;
}

body.dark-mode nav a {
    color: var(--text-color-dark);
}

.container {
    display: flex;
    max-width: 1100px;
    margin: 3rem auto;
    padding: 0 1rem;
}

main {
  flex: 3;
}

.sidebar {
    flex: 1;
    margin-left: 3rem;
    padding-top: 1rem; /* Align with main content */
}

.categories h3 {
    border-bottom: 2px solid var(--text-color-light);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

body.dark-mode .categories h3 {
    border-color: var(--text-color-dark);
}

.categories ul {
    list-style: none;
    padding: 0;
}

.categories li {
    margin-bottom: 0.5rem;
}

.categories a {
    text-decoration: none;
    color: var(--secondary-color-light);
    font-size: 0.95rem;
}

body.dark-mode .categories a {
    color: var(--secondary-color-dark);
}


.post-list {
  list-style: none;
  padding: 0;
}

.post-list li {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color-light);
  padding-bottom: 2rem;
}

body.dark-mode .post-list li {
    border-color: var(--border-color-dark);
}

.post-list a {
  text-decoration: none;
  color: var(--text-color-light);
}

body.dark-mode .post-list a {
    color: var(--text-color-dark);
}

.post-list h3 {
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
    color: var(--primary-color-light);
}

body.dark-mode .post-list h3 {
    color: var(--primary-color-dark);
}

.post-date {
    color: var(--secondary-color-light);
    font-size: 0.9rem;
}

body.dark-mode .post-date {
    color: var(--secondary-color-dark);
}

.post {
    border-bottom: 1px solid var(--border-color-light);
    padding-bottom: 2rem;
    margin-bottom: 2rem;
}

body.dark-mode .post {
    border-color: var(--border-color-dark);
}

.post a {
  text-decoration: none;
  color: var(--primary-color-light);
  display: inline-block;
  margin-bottom: 1rem;
}

body.dark-mode .post a {
  color: var(--primary-color-dark);
}

.post h2 {
  margin-top: 0;
  font-size: 2rem;
}

.social-share {
    margin-top: 2rem;
}

.social-share span {
    font-weight: 700;
    margin-right: 1rem;
}

.social-share a {
    margin-right: 1rem;
    text-decoration: none;
    color: var(--secondary-color-light);
    border: 1px solid var(--border-color-light);
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

body.dark-mode .social-share a {
    color: var(--secondary-color-dark);
    border-color: var(--border-color-dark);
}

footer {
    border-top: 1px solid var(--border-color-light);
    margin-top: 3rem;
    padding: 2rem 1rem;
    text-align: center;
}

body.dark-mode footer {
    border-color: var(--border-color-dark);
}

.author-bio {
    max-width: 600px;
    margin: 0 auto 2rem;
}

.social-links a {
    margin: 0 0.5rem;
    text-decoration: none;
    color: var(--primary-color-light);
}

body.dark-mode .social-links a {
    color: var(--primary-color-dark);
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    font-size: 0.95rem;
}

.custom-table th, .custom-table td {
    border: 1px solid var(--border-color-light);
    padding: 0.75rem;
    text-align: left;
}

.custom-table th {
    background-color: #f8f9fa;
}

body.dark-mode .custom-table th {
    background-color: #343a40;
}

body.dark-mode .custom-table th, body.dark-mode .custom-table td {
    border-color: var(--border-color-dark);
}