.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 240px;
  height: 100vh;
  background: linear-gradient(180deg, #d0f7c5 0%, #a7e9af 100%);
  border-right: 1px solid #b8e0a0;
  padding: 24px 16px;
  box-sizing: border-box;
  color: #2f4f4f;
  overflow-y: auto;
}

.sidebar h2 {
  color: #2f4f4f;
  font-size: 1.4rem;
  margin-bottom: 32px;
  text-align: center;
}

.sidebar ul {
  list-style: none;
}

.sidebar li {
  margin: 12px 0;
}

.sidebar a, .sidebar button {
  display: block;
  padding: 12px 16px;
  color: #2f4f4f;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.2s;
}

.sidebar a:hover, .sidebar button:hover {
  background: rgba(255,255,255,0.4);
}

.sidebar .active {
  background: rgba(255,255,255,0.6);
  font-weight: 600;
}

.logout-btn {
  margin-top: 80px;
  background: #dc2626;
  color: white !important;
  border: none;
  cursor: pointer;
  width: 100%;
}

.logout-btn:hover {
  background: #b91c1c;
}

/* メインコンテンツの位置調整 */
.main-content {
  margin-left: 240px;
  padding: 32px;
  min-height: 100vh;
  background: #f9fafb;
}