/* =========================================================
   CEA style.css（崩れない最終版・統合完成版）
   ・PC/スマホ安定
   ・上部メニュー（横1行＋横スクロール）
   ・トップ最新記事（top-news）
   ・カード(grid)対応
   ・フッター/見出し/リンク統一
========================================================= */


/* =========================
   1. 基本設定
========================= */
html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Hiragino Kaku Gothic ProN","Meiryo",sans-serif;
  background: #f9f9f9;
  color: #333;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
  box-sizing: border-box;
}

*, *::before, *::after {
  box-sizing: inherit;
}

a {
  color: #004a7c;
  text-decoration: none;
}

a:hover {
  opacity: 0.85;
}

h1, h2, h3 {
  color: #003366;
  margin-top: 0;
}

p {
  margin-top: 0;
}


/* =========================
   2. ヘッダー
========================= */
header {
  position: relative;
  background-image: url("https://www.cea.jp/image/z250715.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: #fff;
  text-align: center;
  padding: 80px 20px;
}

header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 74, 124, 0.55);
  z-index: 0;
}

header * {
  position: relative;
  z-index: 1;
}

header h1 {
  margin: 0;
  font-size: 2.2em;
  letter-spacing: 0.05em;
  color: #fff;
}

header p {
  margin: 20px 0 30px;
  font-size: 1.1em;
  color: #fff;
}

.btn-primary {
  display: inline-block;
  padding: 12px 18px;
  background: #ffcc00;
  color: #003366;
  font-weight: bold;
  border-radius: 8px;
}

.btn-primary:hover {
  background: #ffd633;
}


/* =========================
   3. 上部メニュー（横1行＋横スクロール）
========================= */
.side-box {
  width: 100%;
  background: #fff;
  border-bottom: 2px solid #ddd;
  padding: 10px 15px;

  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;

  -webkit-overflow-scrolling: touch;
}

.side-box h3 {
  display: none;
}

.nav-list {
  display: inline-flex;
  flex-wrap: nowrap;
  gap: 12px;

  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list li {
  flex: 0 0 auto;
}

.nav-list li a {
  display: inline-block;
  padding: 8px 12px;
  background: #f5f5f5;
  border-radius: 6px;
  text-decoration: none;
  color: #003366;
  font-size: 14px;
  font-weight: 500;
  transition: 0.2s;
}

.nav-list li a:hover {
  background: #0073aa;
  color: #fff;
}


/* =========================
   4. レイアウト（本文）
========================= */
.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 30px 15px;
  width: 100%;
}

main {
  width: 100%;
  padding: 25px 30px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
  max-width: 1400px;
  margin: 0 auto;
}


/* =========================
   5. トップページ 最新ニュース
========================= */
.top-news {
  width: 100%;
  padding: 25px 0;
  background: #f5f7fa;
}

.top-news-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

.top-news h2 {
  font-size: 20px;
  margin: 0 0 15px;
  border-left: 6px solid #0073aa;
  padding-left: 12px;
  color: #003366;
}

.top-news dt {
  font-size: 16px;
  font-weight: bold;
  margin-top: 10px;
  color: #0b2e57;
}

.top-news dd {
  margin: 8px 0 0;
  line-height: 1.7;
  font-size: 15px;
}

.top-news img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 12px 0;
  border-radius: 8px;
}

.news-link {
  display: inline-block;
  margin-top: 10px;
  padding: 8px 14px;
  background: #0073aa;
  color: #fff;
  border-radius: 6px;
  font-weight: bold;
}

.news-link:hover {
  background: #005f8a;
}


/* =========================
   6. グリッドカード（活動紹介）
========================= */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.card h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}


/* =========================
   7. 新着情報リスト
========================= */
.news-list {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
}

.news-list li {
  padding: 10px 0;
  border-bottom: 1px solid #ddd;
  font-size: 14px;
}


/* =========================
   8. テーブル共通（schedule等）
========================= */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  width: 100%;
  margin-top: 20px;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th, td {
  border: 1px solid #ccc;
  padding: 10px;
  font-size: 14px;
  text-align: left;
}

th {
  background: #f0f0f0;
  font-weight: bold;
}


/* =========================
   9. フッター
========================= */
footer {
  text-align: center;
  padding: 20px;
  background: #003366;
  color: #fff;
  margin-top: 40px;
}


/* =========================
   10. スマホ対応
========================= */
@media screen and (max-width: 768px) {

  header {
    padding: 50px 15px;
  }

  header h1 {
    font-size: 1.6em;
  }

  header p {
    font-size: 0.95em;
  }

  main {
    padding: 18px 16px;
  }

  .top-news-inner {
    padding: 15px 15px;
  }

  .nav-list li a {
    font-size: 13px;
    padding: 7px 10px;
  }
}
/* =========================
   上部メニュー 自動スクロール（無限ループ）
========================= */
.side-box {
  overflow: hidden !important;
}

.nav-list {
  display: flex;
  gap: 12px;
  width: max-content;
  animation: menuScroll 25s linear infinite;
}

@keyframes menuScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}
/* =========================
   CIV_cea.html 画像（図）の最適表示
========================= */
section img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}