@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP&display=swap');

:root {
  --main-color: #004b8d;
  --accent-color: #f7c948;
  --bg-color: #fdfdfd;
  --text-color: #222;
  --font: 'Noto Sans JP', sans-serif;
}

body {
  font-family: var(--font);
  margin: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

header {
  background-color: var(--main-color);
  color: white;
  padding: 1.5rem;
  text-align: center;
}

nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  list-style: none;
  margin: 0;
  padding: 1rem;
  background-color: #e9f2f8;
  gap: 1rem;
}

nav li a {
  text-decoration: none;
  color: var(--main-color);
  font-weight: bold;
}

main {
  max-width: 1000px;
  margin: auto;
  padding: 1.5rem;
}

section.updates {
  background: #f1f1f1;
  padding: 1rem;
  border-left: 6px solid var(--accent-color);
  margin-bottom: 2rem;
}

section.events {
  margin-bottom: 3rem;
}

section.events h2 {
  background-color: var(--main-color);
  color: white;
  padding: 0.5rem 1rem;
  font-size: 1.3rem;
  margin-top: 2rem;
  cursor: pointer;
  user-select: none;
}

section.events h2::after {
  content: ' ⯆';
  float: right;
  font-size: 1rem;
  transition: transform 0.3s;
}

section.events.collapsed h2::after {
  transform: rotate(-90deg);
}

section.events.collapsed .year-articles {
  display: none;
}

article {
  background: #fdfdfd;
  border-left: 4px solid var(--accent-color);
  margin: 1rem 0;
  padding: 1rem;
  box-shadow: 0 0 5px #ccc;
}

article h3 {
  margin: 0 0 0.5rem 0;
}

footer {
  text-align: center;
  background: #004b8d;
  color: #fff;
  padding: 1rem;
  font-size: 0.9rem;
}

@media screen and (max-width: 768px) {
  nav ul {
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
  }

  body {
    font-size: 0.95rem;
  }

  article {
    padding: 0.75rem;
  }

  section.events h2 {
    font-size: 1.1rem;
  }
}
.link-row {
  display: flex;
  flex-wrap: wrap; /* 画面が狭くなったら自動で折り返す */
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding: 0.5rem 1rem;
  background-color: #f8faff;
  border-left: 4px solid #69a7e0;
}

.link-row a {
  white-space: nowrap;
  text-decoration: none;
  color: #004b8d;
  font-weight: bold;
  padding: 0.4rem 0.6rem;
  transition: background-color 0.3s;
}

.link-row a:hover {
  background-color: #e6eef8;
  border-radius: 4px;
}