/* ============================================================
   すてぶるペイ 解説ページ（/learn/）— lp.css の上に重ねる記事の組版
   lp.css の変数（--ink, --gray, --line, --link …）とクラス
   （site-header, faq-list, site-footer, sup.fn, text-link）をそのまま使う。
   ダークモードは持たない（lp.css がライト固定のため、それに合わせる）。
   ============================================================ */

.learn-main {
  padding: 32px 0 88px;
}

.learn-article {
  max-width: 720px;
  margin: 0 auto;
  overflow-wrap: anywhere;
}

/* ---------- パンくず ---------- */

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  color: var(--gray);
  font-size: 12.5px;
  line-height: 1.6;
}

.breadcrumb li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--gray-light);
}

.breadcrumb a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.breadcrumb a:hover {
  color: var(--link);
}

/* ---------- 見出しとリード ---------- */

.learn-article h1 {
  margin: 0 0 20px;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: 0.005em;
}

.learn-lead {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.9;
}

.learn-meta {
  margin: 0 0 8px;
  color: var(--gray);
  font-size: 12.5px;
}

.learn-article h2 {
  margin: 56px 0 16px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.5;
}

.learn-article h3 {
  margin: 32px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.6;
}

/* ---------- 本文 ---------- */

.learn-body p,
.learn-body ul,
.learn-body ol {
  margin: 0 0 16px;
}

.learn-body ul,
.learn-body ol {
  padding-left: 1.4em;
}

.learn-body li + li {
  margin-top: 6px;
}

.learn-body a,
.learn-sources a,
.learn-related a,
.learn-about a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.learn-body a:hover,
.learn-sources a:hover,
.learn-related a:hover,
.learn-about a:hover {
  text-decoration-thickness: 2px;
}

.learn-body sup.fn a {
  color: var(--gray);
  text-decoration: none;
}

.learn-note {
  color: var(--gray);
  font-size: 13.5px;
}

/* ---------- 表（スマホでは行ごとの縦積みにして、横スクロールを出さない） ---------- */

.learn-table {
  width: 100%;
  margin: 0 0 12px;
  border-collapse: collapse;
  font-size: 13.5px;
  line-height: 1.7;
}

.learn-table caption {
  margin: 0 0 8px;
  color: var(--gray);
  font-size: 12.5px;
  text-align: left;
}

.learn-table th,
.learn-table td {
  padding: 12px 12px 12px 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.learn-table thead th {
  border-bottom: 1px solid var(--line-strong);
  color: var(--gray);
  font-size: 12px;
  font-weight: 600;
}

.learn-table tbody th {
  width: 22%;
  font-weight: 600;
}

.learn-table tbody td {
  color: var(--gray);
}

/* ---------- FAQ（lp.css の .faq-list をそのまま使い、幅だけ記事に合わせる） ---------- */

.learn-article .faq-list {
  max-width: none;
}

/* ---------- 出典・関連・紹介の箱 ---------- */

.learn-sources ol {
  margin: 0;
  padding-left: 1.6em;
  color: var(--gray);
  font-size: 13px;
  line-height: 1.75;
}

.learn-sources li + li {
  margin-top: 6px;
}

.learn-related ul {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.learn-related li {
  border-bottom: 1px solid var(--line);
}

.learn-related a {
  display: block;
  padding: 12px 0;
  font-weight: 600;
}

.learn-about {
  margin: 56px 0 0;
  padding: 24px;
  border: 1px solid var(--line-strong);
}

.learn-article .learn-about h2 {
  margin: 0 0 8px;
  padding: 0;
  border: 0;
  font-size: 17px;
}

.learn-about p {
  margin: 0 0 8px;
  font-size: 14.5px;
}

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

/* ---------- ハブ（/learn/）のカード ---------- */

.learn-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.learn-cards a {
  display: block;
  height: 100%;
  padding: 20px;
  border: 1px solid var(--line);
  transition: border-color 150ms ease;
}

.learn-cards a:hover {
  border-color: var(--ink);
}

.learn-cards h2 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.learn-cards a:hover h2 {
  color: var(--link);
}

.learn-cards p {
  margin: 0;
  color: var(--gray);
  font-size: 14px;
  line-height: 1.75;
}

/* ---------- スマホ ---------- */

@media (max-width: 600px) {
  .learn-main {
    padding: 20px 0 60px;
  }

  .learn-article h1 {
    font-size: 24px;
  }

  .learn-lead {
    font-size: 16px;
  }

  .learn-article h2 {
    margin-top: 44px;
    padding-top: 24px;
    font-size: 19px;
  }

  .learn-cards {
    grid-template-columns: 1fr;
  }

  .learn-about {
    padding: 18px;
  }

  .learn-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .learn-table,
  .learn-table caption,
  .learn-table tbody,
  .learn-table tr,
  .learn-table th,
  .learn-table td {
    display: block;
    width: 100%;
  }

  .learn-table tr {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
  }

  .learn-table tbody th,
  .learn-table td {
    padding: 4px 0;
    border: 0;
  }

  .learn-table tbody th {
    width: 100%;
    font-size: 14.5px;
  }

  .learn-table td::before {
    content: attr(data-label) "：";
    color: var(--ink);
    font-weight: 600;
  }
}