/* ========================================
   single.css  （単一ページ専用）
======================================== */

body {
  padding-bottom: 70px; /* 固定フッター分 */
}

/* ヘッダー（サイト名 + サブタイトル） */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid #eee;
  padding: 1.2rem 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.brand {
  margin-top:10px;    
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.site-title {
  font-size: 1.8rem;
  font-weight: 700;
  /*color: #222;*/
}

.subtitle {
  font-size: 1.2rem;
  color: #777;
  font-weight: 400;
}

.container-section {
    padding:30px;
}

.container-section ul {
    padding:20px;
}

.container-section ul li{
    padding:20px 10px;
    border-style:solid none solid none;
    border-width:0.3px; 
    margin:0.4rem;
}

.container-single {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1.4rem 2rem 3rem;    
}

/* 2カラム */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1.4rem 2rem 3rem;
  display: grid;
  /*  grid-template-columns: 1fr 200px;*/
  grid-template-columns: 230px 770px ;
  gap: 3rem;
}

.main h1 {
  font-size: 1.45rem;
  margin-bottom: 1.1rem;
  font-weight: 700;
}

.main p {
  margin-bottom: 1.2rem;
  color: #444;
}

.sidebar {
  font-size: 0.95rem;
}

.sidebar h3 {
  font-size: 1rem;
  margin-bottom: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid #eee;
}

.sidebar li {
  margin-bottom: 0.5rem;
}

.sidebar a {
  color: #555;
}

.sidebar a:hover {
  color: #000;
}

/* 固定フッターメニュー */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: #fff;
  border-top: 1px solid #eee;
  padding: 0.9rem 1rem;
  z-index: 100;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 1.8rem;
  max-width: 1000px;
  margin: 0 auto;
}

.footer-nav a {
  color: #555;
  font-size: 0.9rem;
}

.footer-nav a:hover {
  color: #000;
}

/* トップに戻る */
.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 5.5rem;
  padding: 0.5rem 0.9rem;
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 0.8rem;
  color: #555;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s;
  z-index: 300;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: #f5f5f5;
  color: #000;
}