/* =========================
   CONTENT
========================= */

/* ===== セクション ===== */

.section{
  padding:20px 40px;
  margin-bottom:20px;
  border-radius:6px;
}

.section:nth-of-type(odd){
  background:#fbfaf7;
}

.section:nth-of-type(even){
  background:#f1efe9;
}

/* ===== 分類見出し ===== */

.sub-heading{
  display:block;
  width:100%;                 /* 長さはお好みで 40〜60% */
  max-width:500px;

   padding:3px 14px;          /* ← さらに高さを縮小 */
  margin:5px 0 18px;

 font-size:1.05rem;         /* 少しだけ小さく */
  font-weight:600;
  letter-spacing:0.05em;
  color:#fff;

  border-radius:10px;   /* ← 角丸を大きく */

  background:linear-gradient(
    90deg,
#1a237e 0%,              /* 深い紺 */
    #3949ab 30%,             /* やや明るい紺 */
    rgba(26,35,126,0.05) 60%,/* かなり薄く */
    rgba(26,35,126,0) 100%   /* 完全透明 */  );
}


/* ===== 分類見出し ===== */

.line-t{
  font-size:20px;
  margin-bottom:25px;
  padding-left:14px;
  border-left:4px solid #7a0000;
  font-weight:bold;
}

/* ===== 書籍行 ===== */

.line{
  margin-left:10px;
  margin-bottom:8px;
  font-size:15px;
  font-family: "Noto Serif JP", "Hiragino Mincho ProN", serif;
}


/* =========================
   MOBILE
========================= */

@media(max-width:768px){

  .section{
    padding:25px 18px;
    margin-bottom:40px;
  }

  .line-t{
    font-size:17px;
  }

  .line{
  margin-left:0px;
  margin-bottom:10px;
    font-size:14px;
  line-height: 1.5;
  }

  .year-title{
    width:100%;
    max-width:none;
  }

}