/* BTB Workout Log 筋肥大コラム 共通スタイル */
:root {
  --accent: #5b7cfa;
  --accent-dark: #4356c0;
  --ink: #0b1020;
  --ink-soft: #47506b;
  --muted: #6b7280;
  --bg: #ffffff;
  --bg-soft: #f1f3fb;
  --border: #e2e6f2;
  --protein: #e5484d;
  --fat: #f5a524;
  --carb: #3e86f5;
  --max-width: 760px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}

/* ヘッダー */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.site-header .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.brand .logo { font-weight: 800; font-size: 18px; letter-spacing: .02em; }
.brand .logo span { color: var(--accent-dark); }
.brand .tag { font-size: 12px; color: var(--muted); }
.site-header nav a {
  color: var(--accent-dark);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}
.site-header nav a:hover { text-decoration: underline; }

/* レイアウト */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 56px;
}
.breadcrumb {
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 20px;
}
.breadcrumb a { color: var(--accent-dark); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* 記事 */
article h1 {
  font-size: 26px;
  line-height: 1.5;
  margin: 0 0 10px;
  letter-spacing: .01em;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 24px;
}
.article-meta .cat {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--accent-dark);
  border-radius: 999px;
  padding: 2px 12px;
  font-weight: 600;
}
article .lead {
  background: var(--bg-soft);
  border-left: 4px solid var(--accent);
  border-radius: 0 12px 12px 0;
  padding: 16px 20px;
  margin: 0 0 28px;
}
article .lead p { margin: 0 0 8px; }
article .lead p:last-child { margin-bottom: 0; }
article h2 {
  font-size: 21px;
  line-height: 1.5;
  margin: 48px 0 16px;
  padding: 10px 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  border-radius: 10px;
}
article h3 {
  font-size: 17px;
  margin: 32px 0 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent);
}
article p { margin: 0 0 16px; }
article ul, article ol { padding-left: 24px; margin: 0 0 16px; }
article li { margin-bottom: 6px; }
article strong { color: var(--accent-dark); }
article .note {
  font-size: 13px;
  color: var(--muted);
  background: var(--bg-soft);
  border-radius: 10px;
  padding: 12px 16px;
  margin: 0 0 16px;
}

/* 目次 */
.toc {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 0 0 32px;
  background: var(--bg);
}
.toc .toc-title { font-weight: 700; font-size: 14px; margin: 0 0 8px; color: var(--ink-soft); }
.toc ol { margin: 0; padding-left: 22px; font-size: 14px; }
.toc a { color: var(--accent-dark); text-decoration: none; }
.toc a:hover { text-decoration: underline; }

/* テーブル */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 20px;
  font-size: 14px;
}
th, td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: var(--bg-soft); font-weight: 700; white-space: nowrap; }
.table-scroll { overflow-x: auto; margin: 0 0 20px; }
.table-scroll table { margin: 0; min-width: 560px; }

/* FAQ */
.faq dt {
  font-weight: 700;
  margin: 20px 0 6px;
  padding-left: 28px;
  position: relative;
}
.faq dt::before {
  content: "Q";
  position: absolute;
  left: 0;
  top: 2px;
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.faq dd { margin: 0 0 16px; padding-left: 28px; }

/* PFCチップ */
.pfc-chip {
  display: inline-block;
  border-radius: 999px;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
}
.pfc-chip.p { background: var(--protein); }
.pfc-chip.f { background: var(--fat); }
.pfc-chip.c { background: var(--carb); }

/* CTA */
.cta {
  margin: 48px 0 0;
  padding: 28px 24px;
  border-radius: 16px;
  background: #0b1020;
  color: #eef2ff;
  text-align: center;
}
.cta h2 {
  all: unset;
  display: block;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 8px;
}
.cta p { color: #aab4d4; font-size: 14px; margin: 0 0 18px; }
.cta a {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  border-radius: 999px;
  padding: 12px 32px;
}
.cta a:hover { opacity: .9; }

/* 関連記事 */
.related {
  margin: 40px 0 0;
}
.related h2 {
  all: unset;
  display: block;
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--ink);
}
.related ul { list-style: none; padding: 0; margin: 0; }
.related li { margin-bottom: 8px; }
.related a { color: var(--accent-dark); text-decoration: none; font-size: 14px; }
.related a:hover { text-decoration: underline; }

/* コラム一覧（ハブページ） */
.hub-hero { margin: 8px 0 32px; }
.hub-hero h1 { font-size: 26px; line-height: 1.5; margin: 0 0 12px; }
.hub-hero p { color: var(--ink-soft); margin: 0; }
.hub-section { margin: 36px 0 0; }
.hub-section h2 {
  font-size: 18px;
  margin: 0 0 4px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}
.hub-section .hub-desc { font-size: 13px; color: var(--muted); margin: 0 0 14px; padding-left: 16px; }
.card-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.card-list a {
  display: block;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color .15s, background .15s;
}
.card-list a:hover { border-color: var(--accent); background: var(--bg-soft); }
.card-list .card-title { font-weight: 700; font-size: 15px; line-height: 1.6; }
.card-list .card-desc { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* フッター */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}
.site-footer .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 32px;
  font-size: 12px;
  color: var(--muted);
}
.site-footer p { margin: 0 0 8px; }

@media (max-width: 480px) {
  article h1, .hub-hero h1 { font-size: 22px; }
  article h2 { font-size: 18px; }
}