@charset "UTF-8";
:root {
  --main-color: #7eb1d9;
  --sub-color: #5e93bd;
}

/* ===============================
   リセット&ベーススタイル
=============================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', Meiryo, sans-serif;
  line-height: 1.8;
  color: #333;
  /* background-color: #f5f5f5; */
  font-size: 16px;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

a {
  color: var(--main-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  text-decoration: underline;
}

/* ===============================
   ヘッダー
=============================== */
header {
  background-color: #fff;
  /* box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08); */
  margin-bottom: 30px;
  background-image: url(img/mainvisual.jpg);
  background-size: cover;
  background-position: center;
  height: 160px;
  position: relative;
  z-index: 0;
  margin-bottom: 20px;
  border-top: 7px solid;
  border-image: linear-gradient(135deg, var(--main-color) 0%, var(--sub-color) 100%) 1;
}

header:before {
  background: #fffc;
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

header .sitetitle {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  font-size: 24px;
  font-weight: bold;
  height: 100%;
  /* padding-top: 79px; */
  display: flex;
  flex-direction: column;
  justify-content: center;
}
header .sitetitle a {
  transition: 0.3s;
  display: inline-block;
  color: #333;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}
header .sitetitle a::first-letter {
  font-size: 130%;
  color: var(--main-color);
}

header .sitetitle a:hover {
  opacity: 0.5;
}

header .mainvisual {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 20px;
}
header .mainvisual > .img {
  height: 300px;
  overflow: hidden;
  display: block;
  border-radius: 8px;
  position: relative;
  background: linear-gradient(135deg, var(--main-color) 0%, var(--sub-color) 100%);
}

header .mainvisual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  margin: 0;
  opacity: 0.8;
}
header .sitetitle a:hover {
  text-decoration: none;
}

/* ===============================
   メインコンテンツエリア
=============================== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 40px;
}

/* パンくずリスト */
.breadcrumbs {
  list-style: none;
  margin-bottom: 20px;
  /* padding: 12px 20px; */
  /* background-color: #fff; */
  border-radius: 6px;
  font-size: 14px;
  /* box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05); */
}

.breadcrumbs li {
  display: inline;
}

.breadcrumbs li::after {
  content: '›';
  margin: 0 10px;
  color: #999;
}

.breadcrumbs li:last-child::after {
  content: '';
  margin: 0;
}

.breadcrumbs li:last-child a,
.breadcrumbs li:last-child span {
  color: #666;
}

/* メインコンテンツグリッド */
.mainContents {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 30px;
}

/* ページタイトル */
.mainTop {
  font-size: 32px;
  font-weight: bold;
  color: #333;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 3px solid;
  border-image: linear-gradient(135deg, var(--main-color) 0%, var(--sub-color) 100%) 1;
  line-height: 1.4;
}

/* ===============================
   記事詳細ページ
=============================== */
.topContents {
}

.topContents p {
  margin-bottom: 20px;
  color: #555;
}

.topContents p:last-child {
  margin-bottom: 0;
}

.topContents img {
  display: block;
  margin: 30px auto;
  border-radius: 6px;
}

.topContents a {
  font-weight: 500;
  word-break: break-all;
}

/* ===============================
   記事一覧ページ
=============================== */
/* 一覧ページのtopContentsは背景なし */
.topContents:has(.category_list) {
  background-color: transparent;
  padding: 0;
  box-shadow: none;
}

.category_list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 25px;
}

.category_list li {
  background-color: #f4f4f4;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.category_list li:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.category_list li a.page_link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.category_list li a.page_link:hover {
  color: inherit;
  text-decoration: none;
}

.category_list dl {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.category_list dt {
  padding: 20px 20px 15px;
  font-size: 18px;
  font-weight: bold;
  color: #333;
  line-height: 1.5;
  min-height: 80px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid #e9ecef;
}

.category_list dd {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.category_list .cap {
  width: 100%;
  height: 220px;
  overflow: hidden;
  background-color: #f4f4f4;
  display: flex;
  align-items: center;
  justify-content: center;
}

.category_list .cap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
  border-radius: unset;
}

.category_list li:hover .cap img {
  transform: scale(1.05);
}

.category_list dd span {
  padding: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: #666;
}

/* ===============================
   サイドバー
=============================== */
.sidebar {
  position: sticky;
  top: 20px;
  height: fit-content;
}

.sidelist {
  background-color: #f4f4f4;
  border-radius: 8px;
}

.sidelist dt {
  /* color: #fff; */
  padding: 15px 20px;
  font-size: 18px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  text-align: center;
  border-bottom: 1px solid #e9ecef;
}

.sidelist dd {
  padding: 0;
}

.sidelist .list {
  list-style: none;
}

.sidelist .list li {
  border-bottom: 1px solid #e9ecef;
  padding: 0;
}

.sidelist .list li:last-child {
  border-bottom: none;
}

.sidelist .list li a {
  display: block;
  padding: 12px 15px;
  color: #495057;
  transition: all 0.3s ease;
  position: relative;
  padding-left: 30px;
}

.sidelist .list li a::before {
  content: '▸';
  position: absolute;
  left: 12px;
  color: var(--main-color);
  transition: left 0.3s ease;
}

.sidelist .list li a:hover {
  background-color: #edeff0;
  color: var(--main-color);
  text-decoration: none;
  padding-left: 35px;
}

.sidelist .list li a:hover::before {
  left: 15px;
}

/* ===============================
   フッター
=============================== */
footer {
  background: linear-gradient(135deg, var(--main-color) 0%, var(--sub-color) 100%);
  color: #fff;
  text-align: center;
  padding: 30px 20px;
  margin-top: 60px;
}

footer .sitetitle {
  font-size: 20px;
  font-weight: bold;
  opacity: 0.9;
}

/* ===============================
   レスポンシブデザイン
=============================== */

/* タブレット（900px以下） */
@media (max-width: 900px) {
  header {
    height: 120px;
  }
  .mainContents {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .sidebar {
    position: static;
  }

  .category_list {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
  }

  header .sitetitle {
    padding: 15px 15px 12px;
    font-size: 18px;
  }

  header .mainvisual {
    padding: 0 15px 15px;
  }

  .topContents {
    padding: 0;
  }

  .topContents:has(.category_list) {
    padding: 0;
  }

  .mainTop {
    font-size: 26px;
    margin-bottom: 25px;
    padding-bottom: 15px;
  }
}

/* スマートフォン（600px以下） */
@media (max-width: 600px) {
  body {
    font-size: 15px;
  }

  main {
    padding: 0 15px 30px;
  }
  header .sitetitle {
    padding: 12px 15px;
  }

  header .mainvisual {
    padding: 0 15px 12px;
  }

  header .mainvisual .img {
    height: 180px;
  }

  .breadcrumbs {
    font-size: 13px;
    margin-bottom: 15px;
  }

  .breadcrumbs li::after {
    margin: 0 6px;
  }

  .topContents {
    padding: 0;
  }

  .topContents:has(.category_list) {
    padding: 0;
    margin-bottom: 20px;
  }

  .mainTop {
    font-size: 22px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom-width: 2px;
  }

  .topContents p {
    margin-bottom: 18px;
  }

  .topContents img {
    margin: 20px auto;
  }

  .category_list {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .category_list dt {
    font-size: 16px;
    padding: 15px;
    min-height: 70px;
  }

  .category_list .cap {
    height: 200px;
  }

  .category_list dd span {
    padding: 15px;
    font-size: 13px;
    -webkit-line-clamp: 3;
  }

  .sidelist dt {
    padding: 12px 15px;
    font-size: 16px;
  }

  .sidelist dd {
    padding: 15px;
  }

  .sidelist .list li a {
    padding: 10px 12px;
    padding-left: 28px;
    font-size: 14px;
  }

  footer {
    padding: 25px 15px;
    margin-top: 40px;
  }

  footer .sitetitle {
    font-size: 18px;
  }
}

/* 小型スマートフォン（400px以下） */
@media (max-width: 400px) {
  header .sitetitle {
    font-size: 18px;
  }

  .mainTop {
    font-size: 20px;
  }

  .breadcrumbs {
    font-size: 12px;
  }

  .breadcrumbs li::after {
    margin: 0 4px;
  }

  .category_list dt {
    font-size: 15px;
  }

  .category_list .cap {
    height: 180px;
  }
}