/* =====================================================================
   コラム（/column/）専用スタイル
   ---------------------------------------------------------------------
   一覧ページ（column/index.html）と記事ページ（column/<slug>/index.html）
   の両方が読む。サイト共通の css/style.css の後に読み込む前提。
   配色・フォントは style.css の変数（--bg / --text / --accent / --grad）
   をそのまま使い、LINE 導線だけ LINE 公式色（#06c755）で目立たせる。
   ===================================================================== */

:root {
  --line-green: #06c755;
  --line-green-dark: #05b34c;
  --col-body: #d6daf0;      /* 本文。--text より少し落として長文でも疲れにくく */
  --col-max: 800px;         /* 記事本文の最大幅 */
  --col-wide: min(1160px, 92vw); /* 見出し・サムネ・本文＋目次の共通幅（左端を揃える） */
}

/* ---------- 一覧ページ ---------- */
.col-hero { padding: 180px 0 70px; min-height: 0; }
.col-hero .lead { max-width: 720px; }
.col-hero .col-hero-line {
  display: inline-flex; align-items: center; gap: 10px; margin-top: 26px;
  padding: 12px 22px; border-radius: 999px; background: rgba(6, 199, 85, 0.12);
  border: 1px solid rgba(6, 199, 85, 0.45); color: #7cf5b2; font-size: 14px; font-weight: 700;
  text-decoration: none; transition: background 0.3s, transform 0.3s;
}
.col-hero .col-hero-line:hover { background: rgba(6, 199, 85, 0.22); transform: translateY(-2px); }
.col-hero .col-hero-line svg { width: 20px; height: 20px; fill: currentColor; }

.col-section { padding-top: 0; }
.col-count { color: var(--muted); font-size: 13px; letter-spacing: 0.08em; margin-bottom: 26px; font-family: var(--font-en); }

.col-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 44px; }
.col-filter button {
  padding: 8px 18px; border-radius: 999px; border: 1px solid var(--line);
  background: transparent; color: var(--muted); font-family: var(--font-jp);
  font-size: 13px; font-weight: 700; letter-spacing: 0.06em; cursor: pointer;
  transition: color 0.3s, border-color 0.3s, background 0.3s;
}
.col-filter button:hover { color: var(--text); border-color: rgba(255,255,255,0.35); }
.col-filter button.active { color: #05060f; background: var(--accent); border-color: var(--accent); }

/* 注目記事（最新1本） */
.col-featured {
  display: grid; grid-template-columns: 1.15fr 1fr; gap: 0; overflow: hidden;
  border-radius: 28px; border: 1px solid var(--line); background: var(--panel);
  text-decoration: none; color: inherit; position: relative; margin-bottom: 56px;
  transition: transform 0.5s var(--ease), border-color 0.4s, box-shadow 0.5s;
}
.col-featured::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px;
  background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: 0; transition: opacity 0.4s;
}
.col-featured:hover { transform: translateY(-4px); box-shadow: 0 30px 80px rgba(0,0,0,0.45); }
.col-featured:hover::before { opacity: 1; }
.col-featured .thumb { position: relative; aspect-ratio: 16 / 10; overflow: hidden; }
.col-featured .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.8s var(--ease); }
.col-featured:hover .thumb img { transform: scale(1.04); }
.col-featured .body { padding: clamp(28px, 4vw, 48px); display: flex; flex-direction: column; justify-content: center; gap: 14px; }
.col-featured .badge-new {
  font-family: var(--font-en); font-size: 11px; letter-spacing: 0.22em; color: #05060f;
  background: var(--grad); padding: 5px 12px; border-radius: 999px; align-self: flex-start;
}
.col-featured h2 { font-size: clamp(20px, 2.4vw, 28px); line-height: 1.5; font-weight: 700; margin: 0; }
.col-featured p { color: var(--muted); font-size: 14px; line-height: 1.9; margin: 0; }
.col-featured .more { font-family: var(--font-en); font-size: 12px; letter-spacing: 0.18em; color: var(--accent); margin-top: 6px; }

.col-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.col-meta time { font-family: var(--font-en); font-size: 12px; letter-spacing: 0.12em; color: var(--muted); }
.col-meta .cat {
  font-size: 11px; letter-spacing: 0.12em; border: 1px solid var(--accent); color: var(--accent);
  border-radius: 999px; padding: 3px 10px; white-space: nowrap;
}
.col-meta .read { font-size: 12px; color: var(--muted); }

/* 記事カードのグリッド */
.col-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 28px; }
.col-card {
  display: flex; flex-direction: column; border-radius: 22px; overflow: hidden;
  background: var(--panel); border: 1px solid var(--line); text-decoration: none; color: inherit;
  transition: transform 0.5s var(--ease), border-color 0.4s, box-shadow 0.5s;
}
.col-card:hover { transform: translateY(-6px); border-color: rgba(255,255,255,0.28); box-shadow: 0 24px 60px rgba(0,0,0,0.4); }
.col-card .thumb { aspect-ratio: 16 / 9; overflow: hidden; background: var(--bg2); }
.col-card .thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.8s var(--ease); }
.col-card:hover .thumb img { transform: scale(1.05); }
.col-card .body { padding: 22px 24px 26px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.col-card h3 { font-size: 16px; line-height: 1.6; font-weight: 700; margin: 0; }
.col-card p {
  color: var(--muted); font-size: 13px; line-height: 1.8; margin: 0;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.col-card .more { margin-top: auto; padding-top: 8px; font-family: var(--font-en); font-size: 11px; letter-spacing: 0.18em; color: var(--accent); }
.col-card[hidden] { display: none; }
.col-empty { color: var(--muted); padding: 40px 0; text-align: center; }

/* LINE への横長バナー（一覧の下、記事の途中） */
.line-strip {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px;
  margin-top: 64px; padding: 26px 30px; border-radius: 22px;
  background: linear-gradient(120deg, rgba(6,199,85,0.16), rgba(6,199,85,0.05));
  border: 1px solid rgba(6,199,85,0.4);
}
.line-strip .icon { width: 52px; height: 52px; border-radius: 16px; background: var(--line-green); display: grid; place-items: center; flex: none; }
.line-strip .icon svg { width: 30px; height: 30px; fill: #fff; }
.line-strip h3 { font-size: 17px; margin: 0 0 4px; }
.line-strip p { color: var(--muted); font-size: 13px; margin: 0; line-height: 1.7; }

.line-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 16px 30px; border-radius: 999px; background: var(--line-green); color: #fff;
  font-family: var(--font-jp); font-weight: 700; font-size: 15px; letter-spacing: 0.04em;
  text-decoration: none; white-space: nowrap; border: 1px solid rgba(255,255,255,0.3);
  box-shadow: 0 10px 30px rgba(6,199,85,0.3); transition: background 0.3s, transform 0.3s, box-shadow 0.3s;
}
.line-btn:hover { background: var(--line-green-dark); transform: translateY(-2px); box-shadow: 0 14px 36px rgba(6,199,85,0.4); }
.line-btn svg { width: 22px; height: 22px; fill: currentColor; flex: none; }
.line-btn--ghost { background: transparent; color: #7cf5b2; box-shadow: none; border-color: rgba(6,199,85,0.5); }
.line-btn--ghost:hover { background: rgba(6,199,85,0.12); box-shadow: none; }

/* 一覧下部の CTA セクション */
.col-cta .cta-note { color: var(--muted); font-size: 13px; margin: 18px auto 0; max-width: 520px; line-height: 1.8; }
.col-cta .cta-note a { color: #7cf5b2; text-decoration: underline; text-underline-offset: 3px; }
.col-cta .cta-buttons { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; }

/* ---------- 記事ページ ---------- */
.article-hero { position: relative; padding: 170px 0 48px; overflow: hidden; }
.article-hero .container { position: relative; z-index: 1; max-width: none; width: var(--col-wide); }
.article-hero h1, .article-hero .description { max-width: 960px; }
.article-hero .breadcrumb {
  font-family: var(--font-en); font-size: 11px; letter-spacing: 0.2em; color: var(--muted);
  text-transform: uppercase; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 22px;
}
.article-hero .breadcrumb a { color: var(--muted); text-decoration: none; transition: color 0.3s; }
.article-hero .breadcrumb a:hover { color: var(--text); }
.article-hero .breadcrumb .sep { opacity: 0.5; }
.article-hero .breadcrumb .current { color: var(--text); font-family: var(--font-jp); text-transform: none; letter-spacing: 0.04em; font-size: 12px; }
.article-hero h1 { font-size: clamp(24px, 4vw, 38px); line-height: 1.5; font-weight: 900; letter-spacing: 0.02em; margin: 14px 0 20px; }
.article-hero .description { color: var(--muted); font-size: 15px; line-height: 1.9; margin: 0 0 22px; }
.article-hero .author-line { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; }
.article-hero .author-line img { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line); background: var(--bg2); object-fit: contain; padding: 4px; }
.article-hero .author-line strong { color: var(--text); font-weight: 700; }

.article-thumb { width: var(--col-wide); margin: 0 auto; }
.article-thumb img { width: 100%; aspect-ratio: 21 / 9; object-fit: cover; border-radius: 22px; border: 1px solid var(--line); display: block; }

.article-section { padding-top: 56px; }
.article-layout { width: var(--col-wide); margin-inline: auto; display: grid; grid-template-columns: minmax(0, var(--col-max)) 300px; gap: 60px; justify-content: center; }
.article-main { min-width: 0; }
.article-side { position: sticky; top: 110px; align-self: start; display: flex; flex-direction: column; gap: 20px; }

/* 目次 */
.toc { border: 1px solid var(--line); border-radius: 18px; padding: 20px 22px; background: var(--panel); }
.toc .toc-title { font-family: var(--font-en); font-size: 11px; letter-spacing: 0.22em; color: var(--muted); margin-bottom: 12px; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; counter-reset: toc; }
.toc li { counter-increment: toc; display: flex; gap: 10px; font-size: 13px; line-height: 1.6; }
.toc li::before { content: counter(toc, decimal-leading-zero); font-family: var(--font-en); color: var(--accent); font-size: 11px; letter-spacing: 0.1em; padding-top: 3px; flex: none; }
.toc a { color: var(--col-body); text-decoration: none; transition: color 0.3s; }
.toc a:hover, .toc a.active { color: var(--text); }
.toc-mobile { display: none; margin: 0 0 32px; }
.toc-mobile summary { cursor: pointer; list-style: none; }
.toc-mobile summary::-webkit-details-marker { display: none; }
.toc-mobile summary .toc-title { display: flex; justify-content: space-between; align-items: center; margin: 0; }
.toc-mobile[open] summary .toc-title { margin-bottom: 12px; }

/* サイドの LINE ミニボックス */
.side-line { border-radius: 18px; padding: 22px; background: linear-gradient(160deg, rgba(6,199,85,0.18), rgba(6,199,85,0.04)); border: 1px solid rgba(6,199,85,0.4); }
.side-line h3 { font-size: 15px; margin: 0 0 8px; line-height: 1.5; }
.side-line p { color: var(--muted); font-size: 12px; line-height: 1.7; margin: 0 0 14px; }
.side-line .line-btn { width: 100%; padding: 14px 18px; font-size: 14px; }

/* 本文 */
.article-body { color: var(--col-body); font-size: 16.5px; line-height: 2; letter-spacing: 0.03em; }
.article-body > :first-child { margin-top: 0; }
.article-body p { margin: 0 0 1.5em; }
.article-body strong { color: var(--text); font-weight: 700; }
.article-body em { font-style: normal; color: var(--text); background: linear-gradient(transparent 62%, rgba(0,229,255,0.28) 62%); }
.article-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.article-body a:hover { color: #fff; }
.article-body h2 {
  position: relative; color: var(--text); font-size: clamp(20px, 2.6vw, 25px); font-weight: 900; line-height: 1.5;
  margin: 3em 0 1.1em; padding: 0 0 0 20px; scroll-margin-top: 100px;
}
.article-body h2::before { content: ""; position: absolute; left: 0; top: 0.2em; bottom: 0.2em; width: 5px; border-radius: 3px; background: var(--grad); }
.article-body h3 {
  color: var(--text); font-size: clamp(17px, 2vw, 20px); font-weight: 700; line-height: 1.6;
  margin: 2.2em 0 0.9em; padding-bottom: 10px; border-bottom: 1px solid var(--line); scroll-margin-top: 100px;
}
.article-body h4 { color: var(--text); font-size: 16px; margin: 1.8em 0 0.6em; }
.article-body ul, .article-body ol { margin: 0 0 1.6em; padding-left: 1.4em; }
.article-body li { margin: 0.35em 0; }
.article-body li::marker { color: var(--accent); }
.article-body img { max-width: 100%; height: auto; display: block; margin: 2em auto; border-radius: 16px; border: 1px solid var(--line); }
.article-body blockquote {
  margin: 1.8em 0; padding: 18px 22px; border-left: 4px solid var(--violet); border-radius: 0 14px 14px 0;
  background: var(--panel); color: var(--col-body); font-size: 15px;
}
.article-body blockquote p:last-child { margin-bottom: 0; }
.article-body table { border-collapse: collapse; width: 100%; margin: 1.8em 0; font-size: 14.5px; line-height: 1.7; display: block; overflow-x: auto; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 12px 14px; text-align: left; vertical-align: top; min-width: 120px; }
.article-body th { background: rgba(255,255,255,0.06); color: var(--text); font-weight: 700; white-space: nowrap; }
.article-body td { background: rgba(255,255,255,0.02); }
.article-body hr { border: 0; border-top: 1px solid var(--line); margin: 3em 0; }
.article-body code { font-family: ui-monospace, Menlo, monospace; font-size: 0.9em; background: rgba(255,255,255,0.08); padding: 2px 6px; border-radius: 6px; }
.article-body pre { background: #0a0d1e; border: 1px solid var(--line); padding: 16px; border-radius: 12px; overflow-x: auto; }
.article-body pre code { background: none; padding: 0; }

/* 本文中・末尾の LINE ボックス */
.line-box {
  margin: 3em 0; padding: 30px 32px; border-radius: 22px;
  background: linear-gradient(140deg, rgba(6,199,85,0.16), rgba(6,199,85,0.04));
  border: 1px solid rgba(6,199,85,0.45); text-align: left;
}
.line-box .eyebrow { font-family: var(--font-en); font-size: 11px; letter-spacing: 0.22em; color: #7cf5b2; margin-bottom: 10px; }
.line-box h3 { color: var(--text); font-size: clamp(18px, 2.2vw, 22px); line-height: 1.5; margin: 0 0 12px; padding: 0; border: 0; }
.line-box p { color: var(--col-body); font-size: 14.5px; line-height: 1.8; margin: 0 0 18px; }
.line-box .line-btn { font-size: 16px; padding: 18px 34px; }
.line-box .note { color: var(--muted); font-size: 12.5px; margin: 14px 0 0; line-height: 1.7; }
.line-box--end { text-align: center; padding: clamp(32px, 5vw, 52px) clamp(24px, 4vw, 48px); }
.line-box--end .line-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 22px 0 26px; text-align: left; }
.line-box--end .line-steps div { background: rgba(5,6,15,0.45); border: 1px solid rgba(255,255,255,0.08); border-radius: 14px; padding: 14px 16px; font-size: 13px; line-height: 1.7; color: var(--col-body); }
.line-box--end .line-steps b { display: block; font-family: var(--font-en); color: #7cf5b2; font-size: 11px; letter-spacing: 0.2em; margin-bottom: 4px; }
.line-box .alt { margin-top: 16px; font-size: 13px; color: var(--muted); }
.line-box .alt a { color: var(--text); text-decoration: underline; text-underline-offset: 3px; }

/* 執筆者ボックス（E-E-A-T） */
.author-box { display: grid; grid-template-columns: 72px 1fr; gap: 20px; align-items: start; margin: 3em 0 0; padding: 26px; border-radius: 20px; background: var(--panel); border: 1px solid var(--line); }
.author-box img { width: 72px; height: 72px; border-radius: 50%; border: 1px solid var(--line); background: var(--bg2); object-fit: contain; padding: 10px; }
.author-box .label { font-family: var(--font-en); font-size: 11px; letter-spacing: 0.22em; color: var(--muted); margin-bottom: 6px; }
.author-box h3 { font-size: 17px; margin: 0 0 8px; padding: 0; border: 0; }
.author-box p { color: var(--muted); font-size: 13.5px; line-height: 1.8; margin: 0 0 10px; }
.author-box .links { display: flex; flex-wrap: wrap; gap: 14px; font-size: 13px; }
.author-box .links a { color: var(--accent); text-decoration: none; }
.author-box .links a:hover { text-decoration: underline; }

/* 関連記事 */
.related { margin-top: 64px; }
.related .sec-label { font-family: var(--font-en); font-size: 11px; letter-spacing: 0.22em; color: var(--muted); margin-bottom: 8px; }
.related h2 { font-size: 22px; margin: 0 0 24px; }
.related .col-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 20px; }
.related .col-card h3 { font-size: 14.5px; }
.article-nav { margin-top: 48px; display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }
.article-nav a { color: var(--accent); text-decoration: none; font-size: 14px; }
.article-nav a:hover { text-decoration: underline; }

/* 更新日などのメタ行（本文末） */
.article-foot-meta { margin-top: 40px; color: var(--muted); font-size: 12.5px; line-height: 1.8; border-top: 1px solid var(--line); padding-top: 18px; }

/* ---------- レスポンシブ ---------- */
@media (max-width: 1100px) {
  :root { --col-wide: min(var(--col-max), 92vw); }
  .article-thumb img { aspect-ratio: 16 / 9; }
  .article-layout { grid-template-columns: minmax(0, var(--col-max)); }
  .article-side { display: none; }
  .toc-mobile { display: block; }
}
@media (max-width: 860px) {
  .col-featured { grid-template-columns: 1fr; }
  .col-featured .thumb { aspect-ratio: 16 / 9; }
  .line-strip { grid-template-columns: 1fr; text-align: center; gap: 16px; }
  .line-strip .icon { margin: 0 auto; }
  .line-box--end .line-steps { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .col-hero { padding: 140px 0 50px; }
  .col-grid { grid-template-columns: 1fr; gap: 20px; }
  .article-hero { padding: 130px 0 32px; }
  .article-body { font-size: 16px; line-height: 1.95; }
  .article-body h2 { margin-top: 2.4em; }
  .line-box { padding: 24px 20px; }
  .line-box .line-btn, .line-btn { width: 100%; white-space: normal; text-align: center; }
  .author-box { grid-template-columns: 1fr; }
  .author-box img { width: 60px; height: 60px; }
}
@media (prefers-reduced-motion: reduce) {
  .col-card, .col-featured, .line-btn, .col-card .thumb img, .col-featured .thumb img { transition: none; }
}