/* Base Styles */
body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

/* Header Styles */
header {
  text-align: center;
  margin-bottom: 30px;
  padding: 20px;
  border-bottom: 1px solid #eee;
}

h1, h2, h3 {
  color: #2c3e50;
}

h1 {
  margin: 0;
}

.profile-img {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  margin: 20px auto;
  display: block;
  background-color: #f5f5f5;
}

/* Navigation Styles */
nav {
  margin: 20px 0;
  text-align: center;
}

nav a {
  margin: 0 10px;
  text-decoration: none;
  color: #3498db;
  font-weight: bold;
}

/* Section Styles */
section {
  margin: 40px 0;
}

h2 {
  border-bottom: 2px solid #ecf0f1;
  padding-bottom: 10px;
}

/* Publication Styles */
.publication {
  margin-bottom: 20px;
  padding: 15px;
  background-color: #f9f9f9;
  border-radius: 5px;
}

.publication h3 {
  margin-top: 0;
  color: #34495e;
}

/* Footer Styles */
footer {
  text-align: center;
  margin-top: 50px;
  padding: 20px;
  border-top: 1px solid #eee;
  color: #7f8c8d;
}

/* Social Links */
.social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 20px 0;
}

.social-links a {
  text-decoration: none;
  color: #3498db;
}

/* Language Switcher */
.language-switcher {
  text-align: right;
  margin-bottom: 20px;
}

.language-switcher button {
  background-color: #3498db;
  color: white;
  border: none;
  padding: 5px 10px;
  border-radius: 3px;
  cursor: pointer;
  width: 80px;
  height: 34px;
  font-size: 14px;
}

.language-switcher button:hover {
  background-color: #2980b9;
}

/* Language Display Controls */
.en {
  display: none;
}

.active-lang {
  font-weight: bold;
}

/* Tech Memo Page Styles */
.memo-list {
  margin: 20px 0;
}

.memo-list h3 {
  margin-top: 0;
  color: #2c3e50;
}

.memo-list ul {
  margin: 15px 0;
  padding-left: 25px;
}

.memo-list li {
  margin: 8px 0;
  line-height: 1.5;
}

#tech-memo-content {
  min-height: 400px;
}

/* Individual memo item styles */
.memo-item {
  background-color: white;
  border: 1px solid #e1e5e9;
  border-radius: 8px;
  padding: 25px;
  margin: 25px 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.memo-item h4 {
  color: #2c3e50;
  margin-top: 0;
  margin-bottom: 8px;
  font-size: 1.3em;
}

.memo-date {
  color: #7f8c8d;
  font-size: 0.9em;
  margin-bottom: 15px;
  font-style: italic;
}

.memo-item h5 {
  color: #34495e;
  margin-top: 20px;
  margin-bottom: 10px;
  border-bottom: 1px solid #ecf0f1;
  padding-bottom: 5px;
}

.memo-item pre {
  background-color: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 4px;
  padding: 15px;
  overflow-x: auto;
  margin: 15px 0;
}

.memo-item code {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9em;
  line-height: 1.4;
}

/* Tech memo title list styles */
.memo-title-list {
  list-style: none;
  padding: 0;
}

.memo-title-list li {
  margin: 10px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.memo-title-list a {
  text-decoration: none;
  color: #3498db;
  font-weight: bold;
  flex-grow: 1;
}

.memo-title-list a:hover {
  text-decoration: underline;
}

.memo-title-list .memo-date {
  margin-left: 15px;
  white-space: nowrap;
  color: #7f8c8d;
  font-size: 0.9em;
}

/* Individual memo article styles */
.memo-article {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

.memo-article h1 {
  color: #2c3e50;
  border-bottom: 3px solid #3498db;
  padding-bottom: 10px;
  margin-bottom: 20px;
}

.memo-article h2 {
  color: #34495e;
  margin-top: 30px;
  margin-bottom: 15px;
  border-bottom: 1px solid #ecf0f1;
  padding-bottom: 8px;
}

.memo-article pre {
  background-color: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 6px;
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
  line-height: 1.4;
}

.memo-article code {
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9em;
}