.column-index .main-container {
  margin: 110px auto 0;
  max-width: 760px;
  width: 100%;
  box-sizing: border-box;
  padding: 0 24px 40px;
  flex: 1 0 auto;
}

.column-index {
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.75), rgba(255, 255, 255, 0.75)),
    url(/image/column_background.png);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.column-index h1 {
  width: 100%;
  border-bottom: 3px solid;
  border-image: linear-gradient(to right, #1146f6 0%, #00fffb 100%);
  border-image-slice: 1;
  font-size: 32px;
  margin: 0 0 30px;
}

.column-index .year-filter {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.column-index .year-filter-label {
  font-size: 14px;
  color: #444;
}

.column-index .year-select {
  border: 1px solid #b8b8b8;
  background: #ffffff;
  color: #222121;
  font-size: 14px;
  padding: 6px 10px;
  min-width: 110px;
}

.column-index .column-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.column-index .column-item {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 8px 0;
  text-decoration: none;
  color: #222121;
  border-bottom: 1px solid #ddd;
}

.column-index .column-date {
  min-width: 88px;
  font-size: 15px;
  color: #555;
}

.column-index .column-title {
  font-size: 18px;
  line-height: 1.6;
}

.column-index .column-item:hover .column-title {
  color: orange;
}

@media screen and (max-width: 768px) {
  .column-index .main-container {
    margin-top: 88px;
    padding: 0 16px;
  }

  .column-index h1 {
    width: 100%;
    text-align: center;
    margin: 0 0 20px;
    font-size: 24px;
  }

  .column-index .year-filter,
  .column-index .column-list {
    width: 100%;
  }

  .column-index .column-item {
    gap: 16px;
  }

  .column-index .column-date {
    min-width: 76px;
    font-size: 14px;
  }

  .column-index .column-title {
    font-size: 16px;
  }
}


#footer {
  height: 35px;
  background-color: #b4dbf5;
}

.footer-wrapper {
  height: 30px;
  color: #090909;
  text-align: center;
  padding-top: 5px;
}

small {
  font-size: 20px;
}


/* 769-1024px: 中間ブレークポイント */
@media screen and (max-width: 1024px) and (min-width: 769px) {
	.column-index h1,
	.column-index .year-filter,
	.column-index .column-list {
		width: 100%;
	}
}