body {
  font-family: Avenir,Yu Gothic,ヒラギノ角ゴシック,メイリオ,sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: rgb(70, 5, 108);
}

a:link, a:visited {
  color: rgb(70, 5, 108);
  text-decoration: none;
}

header, nav, main, footer {
  padding: 20px;
}

header {
  text-align: center;
}

article {
  background: #fff;
  padding: 20px;
  margin-bottom: 20px;
}

footer {
  text-align: center;
}

.article-list li {
  margin: 10px 0;
}

.article-list li a {
  text-decoration: none;
  color: rgb(70, 5, 108);
}

article a:link, article a:visited {
  color: #003366 !important;
  text-decoration: underline;
}

article blockquote {
  border-left: 4px solid #ccc;
  margin: 1.5em 0;
  padding: 0.5em 1em;
  background-color: #f9f9f9;
  font-style: italic;
  color: #666;
}

.article-list li a:hover {
  color: #333;
}

/* Contribution Grid Styles */
.contribution-grid {
  margin: 20px 0;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
}

.contribution-grid h3 {
  margin: 0 0 15px 0;
  font-size: 1.2em;
  color: rgb(70, 5, 108);
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(18, 1fr);
  gap: 3px;
  margin-bottom: 15px;
  justify-content: center;
}

.grid-cell {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background-color: #ebedf0;
}

.grid-cell.level-0 {
  background-color: #ebedf0;
}

.grid-cell.level-1 {
  background-color: #9be9a8;
}

.grid-cell.level-2 {
  background-color: #40c463;
}

.grid-cell.level-3 {
  background-color: #30a14e;
}

.grid-legend {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  font-size: 0.8em;
  color: #666;
}

.legend-cells {
  display: flex;
  gap: 2px;
}

/* Activity Page Styles */
.activity-summary {
  background: #fff;
  padding: 20px;
  margin: 20px 0;
  border-radius: 8px;
}

.activity-summary p {
  margin: 0 0 15px 0;
  font-size: 1.1em;
  color: rgb(70, 5, 108);
}

.yearly-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
}

.year-stat {
  padding: 8px 12px;
  background: #f0f0f0;
  border-radius: 6px;
  font-size: 0.9em;
  color: #666;
}

/* Navigation Links */
.nav-links {
  text-align: right;
  margin: 10px 0;
}

.nav-links a {
  color: rgb(70, 5, 108);
  text-decoration: underline;
  font-size: 0.9em;
}

.nav-links a:hover {
  color: #333;
}

@media (max-width: 768px) {
  .contribution-grid {
    margin: 20px 0;
    padding: 15px;
  }
  
  .grid-container {
    grid-template-columns: repeat(18, 1fr);
    gap: 2px;
    margin-bottom: 15px;
    justify-content: center;
  }
  
  .grid-cell {
    width: 8px;
    height: 8px;
  }
  
  .yearly-summary {
    flex-direction: column;
    gap: 8px;
  }
  
  .nav-links a {
    display: block;
    margin: 5px 0;
  }
}

@media (max-width: 480px) {
  .contribution-grid {
    padding: 10px;
  }
  
  .grid-container {
    grid-template-columns: repeat(13, 1fr);
    gap: 1px;
  }
  
  .grid-cell {
    width: 6px;
    height: 6px;
  }
}