/* バナー */
#site-banner {
  width: 100%;
  height: 200px;
  background-image: url("https://images.unsplash.com/photo-1526374965328-7f61d4dc18c5?w=1600&auto=format&fit=crop&q=80");
  background-size: cover;
  background-position: center 40%;
  display: flex;
  align-items: center;
  justify-content: center;
}
#site-banner-inner {
  background: rgba(10, 20, 40, 0.65);
  padding: 1.2rem 3rem;
  border-radius: 8px;
}
#site-banner-inner span {
  color: #ffffff;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.8);
}

/* レイアウト */
#layout-wrapper {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

main.main {
  flex: 1;
  min-width: 0;
}

/* サイドバー */
#site-sidebar {
  width: 260px;
  flex-shrink: 0;
  padding: 1.2rem;
  border-left: 3px solid #2A5298;
  margin-top: 2rem;
  position: sticky;
  top: 1rem;
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 700;
  color: #2A5298;
  margin-bottom: 0.5rem;
  letter-spacing: 1px;
}

.sidebar-hr {
  border: none;
  border-top: 1px solid #C0622A;
  margin-bottom: 0.8rem;
}

.sidebar-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-list li {
  margin-bottom: 0.7rem;
  font-size: 0.85rem;
  line-height: 1.4;
}

.sidebar-list a {
  color: var(--primary);
  text-decoration: none;
}

.sidebar-list a:hover {
  color: #C0622A;
  text-decoration: underline;
}

@media (max-width: 768px) {
  #layout-wrapper { flex-direction: column; }
  #site-sidebar { width: 100%; border-left: none; border-top: 3px solid #2A5298; }
}