/* 全体の背景色を変更 */
body {
    background-color: #00000021;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
}

/* 青色の領域のスタイル */
.intro-banner {
    background-color: #0011ffe1;
    color: white;
    padding: 5px;
    text-align: left;
    font-size: 20px;
}

/* メインナビゲーションのスタイル */
.main-nav {
    display: flex;
    justify-content: center;
    background-color: #333;
    padding: 10px;
    margin: 0;
}

.main-nav li {
    list-style-type: none;
    margin: 0 15px;
}

.main-nav a {
    color: white;
    text-decoration: none;
    font-size: 18px;
}

.main-nav a:hover {
    color: #0a0a0a;
}

/* ドロップダウンメニューのスタイル */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #2bd5ff;
    min-width: 160px;
    z-index: 1;
}

.dropdown-content a {
    color: #1c1d1d;
    padding: 10px 20px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {
    background-color: #ddd;
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* ヒーローセクションのスタイル */
.hero {
    background: url('path_to_background_image.jpg') no-repeat center center/cover;
    color: rgb(0, 0, 0);
    padding: 100px 0;
    text-align: center;
    position: relative;
}

.hero .icon img {
    border-radius: 50%;
    width: 150px;
    height: 150px;
    object-fit: cover;
    margin-bottom: 20px;
}

h1 {
    font-size: 36px;
    margin-top: 20px;
}

/* セクション共通のスタイル */
section {
    padding: 40px;
    text-align: center;
}

/* ボタンのスタイル */
button {
    padding: 10px 20px;
    background-color: #008cba;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #005f73;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 20px;
}

/* GRR記事専用の装飾 */
#grr {
    background-color: #ffffff;
    border-radius: 10px;
    padding: 30px;
    margin: 30px auto;
    max-width: 900px;
    text-align: left;
}

#grr h2 {
    color: #003366;
    font-size: 28px;
    margin-bottom: 20px;
    text-align: center;
}

#grr h3 {
    color: #005588;
    margin-top: 30px;
}

#grr table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

#grr th, #grr td {
    border: 1px solid #aaa;
    padding: 10px;
    text-align: center;
}

#grr th {
    background-color: #0077cc;
    color: white;
}


/* === 追加ユーティリティ（既存を壊さない） === */
.toc{border:1px solid #e5e7eb;border-radius:12px;padding:12px 16px;margin:16px auto;max-width:900px;background:#fff}
.toc strong{display:block} .toc ol{margin:8px 0 0 18px}
.grid{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width:780px){.grid{grid-template-columns:1fr}}
.calc .actions{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.result{padding:12px;border:1px dashed #9ca3af;border-radius:8px;background:#f8fafc;margin-top:8px}
.figure svg{display:block;border:1px solid #e5e7eb;border-radius:8px;background:#fafafa}
.outline{background:transparent;color:#333;border:1px solid #333}
.badge{display:inline-block;border:1px solid #ddd;border-radius:9999px;padding:2px 8px;margin-left:6px;font-size:.85rem;color:#555}
.tooltip{position:absolute;background:#111;color:#fff;padding:6px 8px;border-radius:6px;font-size:.85rem;pointer-events:none;transform:translate(-50%,-110%);white-space:nowrap}
.chart-wrap{position:relative}


/* === Center the GRR article like the TOC box === */
.article-body, #grr {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}
.article-body > *,
#grr > * {
  padding-left: 16px;
  padding-right: 16px;
}
.article-body .figure, .article-body .calc, .article-body .toc,
#grr .figure, #grr .calc, #grr .toc {
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}
@media (max-width: 780px){
  .article-body > *, #grr > * { padding-left: 12px; padding-right: 12px; }
}