/* ============================================================
   brand-culture サイト共通（baigie /company/ 配下の解説ページ型）
   左レール = ページ一覧（グループ見出し + 縦並び・現在地マーク）
   中央 = ブログ風記事
   ============================================================ */
body { background: #fff; }
.bc-header { padding: 26px clamp(20px, 5.8vw, 84px); display: flex; align-items: center; justify-content: space-between; }
.bc-brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.bc-brand .logo-mark { width: 40px; height: 37px; }
.bc-brand-label { font-size: 13px; font-weight: 800; letter-spacing: 0.02em; }
.bc-corp { font-size: 12px; color: var(--ink-2); text-decoration: underline; text-underline-offset: 3px; }

.bc-shell { max-width: 1240px; margin: 0 auto; padding: 24px clamp(20px, 2vw, 28px) 140px; display: grid; grid-template-columns: 1fr; gap: 48px; }

/* ---------- 左レール ---------- */
.bc-rail { font-size: 13.5px; }
.bc-rail-group { margin-top: 28px; }
.bc-rail-group:first-child { margin-top: 0; }
.bc-rail-head { font-size: 13px; font-weight: 800; margin-bottom: 12px; }
.bc-rail ul { list-style: none; display: grid; gap: 10px; }
.bc-rail a { color: var(--ink-2); text-decoration: none; }
.bc-rail a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.bc-rail .is-current { position: relative; padding-left: 14px; }
.bc-rail .is-current::before { content: ""; position: absolute; left: 0; top: 0.55em; width: 6px; height: 6px; border-radius: 50%; background: var(--ink); }
.bc-rail .is-current a { color: var(--ink); font-weight: 700; text-decoration: underline; text-underline-offset: 4px; }
.bc-rail .bc-soon-mini { font-size: 10px; font-weight: 700; color: var(--ink-3); border: 1px solid var(--line-strong); border-radius: 4px; padding: 1px 5px; margin-left: 6px; }

/* ---------- 記事 ---------- */
.bc-article { max-width: 760px; }
.bc-cat { font-size: 13px; color: var(--ink-3); }
.bc-article h1 { margin-top: 14px; font-size: clamp(28px, 3.4vw, 40px); font-weight: 900; line-height: 1.4; }
.bc-statement { margin-top: 40px; font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; line-height: 1.7; }
.bc-statement .keep { display: inline-block; }
.bc-prose { margin-top: 28px; font-size: 15.5px; line-height: 2.1; color: var(--ink-2); }
.bc-prose + .bc-prose { margin-top: 20px; }
.bc-prose strong { color: var(--ink); }
.bc-h2 { margin-top: 56px; font-size: 22px; font-weight: 800; line-height: 1.6; }
.bc-h2 + .bc-prose { margin-top: 18px; }

.bc-list { margin-top: 32px; border-bottom: 1px solid var(--line); }
.bc-row { display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding: 26px 0; border-top: 1px solid var(--line); }
.bc-idx { font-size: 22px; font-weight: 800; line-height: 1.3; color: var(--ink-3); }
.bc-row h2 { font-size: 17px; font-weight: 800; line-height: 1.6; }
.bc-row p { margin-top: 8px; font-size: 14.5px; color: var(--ink-2); line-height: 1.95; }

.bc-wip {
  margin-top: 48px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  padding: 20px 24px;
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.9;
}

.bc-next { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line-strong); }
.bc-next a { font-size: 14px; font-weight: 700; color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }

.bc-footer { padding: 32px clamp(20px, 5.8vw, 84px); font-size: 12px; color: var(--ink-3); }

@media (min-width: 900px) {
  .bc-shell { grid-template-columns: 220px 1fr; gap: 64px; padding-top: 48px; }
  .bc-rail { position: sticky; top: 32px; align-self: start; }
}