.column-page {
  background:
    radial-gradient(ellipse at 50% -4%, rgba(44, 113, 111, .27), transparent 34%),
    linear-gradient(180deg, #020610 0%, #07151c 48%, #02070c 100%);
}

.column-page .site-header { margin-bottom: 0; }
.column-page em { color: var(--gold-pale); font-style: normal; }
.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; color: #809799; font-size: 12px; }
.breadcrumbs a { color: #a8b9b9; text-underline-offset: 4px; }
.breadcrumbs span:last-child { color: #8da1a2; }

.column-hero { min-height: 510px; padding-block: 64px 88px; display: flex; flex-direction: column; justify-content: center; position: relative; }
.column-hero::after { content: "☾"; position: absolute; right: clamp(10px, 7vw, 90px); top: 48%; transform: translateY(-50%); color: rgba(240, 216, 158, .08); font-family: var(--serif); font-size: clamp(180px, 27vw, 340px); line-height: 1; pointer-events: none; }
.column-hero .kicker { margin: 54px 0 13px; }
.column-hero h1 { max-width: 820px; margin: 0 0 24px; font-size: clamp(40px, 5.2vw, 66px); position: relative; z-index: 1; }
.column-hero-lead { max-width: 690px; margin: 0; color: #bdcaca; font-size: 17px; line-height: 2.05; position: relative; z-index: 1; }

.column-index-section { padding-block: 96px 118px; border-block: 1px solid rgba(240, 216, 158, .1); background: linear-gradient(180deg, rgba(8, 28, 35, .9), rgba(4, 14, 20, .94)); }
.column-index-shell { display: grid; gap: 46px; }
.column-section-heading { display: flex; justify-content: space-between; align-items: end; gap: 32px; }
.column-section-heading .kicker { margin-bottom: 7px; }
.column-section-heading h2 { margin: 0; font-family: var(--serif); font-size: clamp(30px, 4vw, 45px); font-weight: 500; letter-spacing: .055em; }
.column-section-heading > p { max-width: 400px; margin: 0; color: #96aaab; font-size: 14px; }
.article-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.article-card { overflow: hidden; display: flex; flex-direction: column; border: 1px solid rgba(240, 216, 158, .21); background: linear-gradient(145deg, rgba(12, 39, 44, .84), rgba(4, 15, 22, .9)); box-shadow: 0 28px 75px rgba(0, 0, 0, .27); }
.article-card-image { display: block; overflow: hidden; }
.article-card-image img { width: 100%; display: block; aspect-ratio: 1.75 / 1; object-fit: cover; transition: transform .5s ease; }
.article-card-image:hover img { transform: scale(1.025); }
.article-card-copy { min-height: 390px; padding: 35px 34px 32px; display: flex; flex: 1; flex-direction: column; }
.article-meta { margin-bottom: 19px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; color: #82999b; font-size: 11px; letter-spacing: .07em; }
.article-meta span { color: var(--gold); }
.article-card h2 { margin: 0 0 17px; font-family: var(--serif); font-size: clamp(24px, 3vw, 31px); font-weight: 500; line-height: 1.6; letter-spacing: .035em; }
.article-card h2 a { text-decoration: none; }
.article-card h2 a:hover { color: var(--gold-pale); }
.article-card-copy > p { color: #aebfbe; font-size: 14px; }
.article-read-link { margin-top: auto; padding-top: 20px; color: var(--gold-pale); font-size: 13px; text-underline-offset: 5px; }
.column-callout { margin-block: 98px; padding: 43px 48px; display: flex; align-items: center; justify-content: space-between; gap: 38px; border: 1px solid rgba(240, 216, 158, .23); background: radial-gradient(circle at 10% 40%, rgba(41, 110, 105, .2), transparent 40%), rgba(5, 18, 24, .72); }
.column-callout .kicker { margin-bottom: 8px; }
.column-callout h2 { margin: 0 0 6px; font-family: var(--serif); font-size: 28px; font-weight: 500; }
.column-callout p:last-child { margin-bottom: 0; color: #9cafae; font-size: 14px; }
.column-callout .button { flex-shrink: 0; }

.article-shell { padding-block: 54px 105px; }
.article-header { width: min(900px, 100%); margin: 56px auto 0; text-align: center; }
.article-header .kicker { margin-bottom: 17px; }
.article-header h1 { margin: 0 0 24px; font-size: clamp(36px, 5vw, 62px); line-height: 1.52; }
.article-lead { max-width: 750px; margin: 0 auto; color: #bdcaca; font-family: var(--serif); font-size: 17px; line-height: 2.05; }
.article-byline { margin: 27px 0 33px; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 22px; color: #809496; font-size: 12px; }
.article-byline span:first-child { color: #b8c5c4; }
.article-hero-image { margin: 0; overflow: hidden; position: relative; border: 1px solid rgba(240, 216, 158, .28); box-shadow: var(--gold-shadow); }
.article-hero-image::after { content: ""; position: absolute; inset: 10px; border: 1px solid rgba(240, 216, 158, .14); pointer-events: none; }
.article-hero-image img { width: 100%; aspect-ratio: 1.75 / 1; object-fit: cover; }

.article-layout { width: min(1030px, 100%); margin: 72px auto 0; display: grid; grid-template-columns: minmax(0, 720px) 230px; gap: 70px; align-items: start; }
.article-body { min-width: 0; color: #c6d1d0; font-size: 17px; line-height: 2.05; }
.article-body > p { margin-bottom: 25px; }
.article-body strong { color: var(--ivory); }
.article-body h2 { margin: 76px 0 23px; padding-top: 5px; color: var(--ivory); font-family: var(--serif); font-size: clamp(27px, 3.4vw, 37px); font-weight: 500; line-height: 1.65; letter-spacing: .045em; }
.article-body h2::before { content: "✦"; margin-right: 12px; color: var(--gold); font-size: 14px; vertical-align: middle; }
.article-body h3 { color: var(--ivory); font-family: var(--serif); font-size: 20px; font-weight: 500; }
.article-body ul { margin: 10px 0 30px; padding-left: 1.4em; }
.article-body li { margin-block: 8px; padding-left: 4px; }
.article-answer { margin: 42px 0 62px; padding: 29px 31px; border-block: 1px solid rgba(240, 216, 158, .28); background: linear-gradient(90deg, rgba(189, 152, 83, .09), transparent); }
.article-answer span { display: block; margin-bottom: 10px; color: var(--gold); font-size: 11px; font-weight: 700; letter-spacing: .14em; }
.article-answer strong { display: block; font-family: var(--serif); font-size: 21px; font-weight: 500; line-height: 1.85; }
.article-inline-cta { margin: 48px 0 66px; padding: 27px 28px; display: flex; align-items: center; justify-content: space-between; gap: 24px; background: rgba(9, 35, 40, .8); border: 1px solid rgba(104, 197, 184, .25); }
.article-inline-cta span { display: block; color: var(--teal-bright); font-size: 11px; font-weight: 700; letter-spacing: .12em; }
.article-inline-cta strong { display: block; margin-top: 5px; font-family: var(--serif); font-size: 15px; font-weight: 500; }
.article-inline-cta .button { min-height: 48px; flex-shrink: 0; font-size: 13px; }
.article-related-link { margin: 31px 0 38px; padding: 20px 22px; display: grid; gap: 5px; border-left: 2px solid var(--gold); background: rgba(189, 152, 83, .07); }
.article-related-link span { color: var(--gold); font-size: 10px; font-weight: 700; letter-spacing: .13em; }
.article-related-link a { color: var(--gold-pale); font-family: var(--serif); font-size: 15px; line-height: 1.8; text-underline-offset: 5px; }
.article-steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(240, 216, 158, .17); }
.article-steps li { margin: 0; padding: 25px 0; display: grid; grid-template-columns: 55px 1fr; gap: 17px; border-bottom: 1px solid rgba(240, 216, 158, .13); }
.article-steps li > span { color: var(--gold); font-family: var(--serif); font-size: 22px; }
.article-steps h3 { margin: 0 0 7px; }
.article-steps p { margin: 0; color: #aebfbe; font-size: 15px; }
.question-grid { margin: 32px 0 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.question-grid section { padding: 27px 25px; border: 1px solid rgba(104, 197, 184, .23); background: rgba(22, 65, 66, .18); }
.question-grid section > span { color: var(--teal-bright); font-size: 11px; font-weight: 700; letter-spacing: .12em; }
.question-grid .question-caution { border-color: rgba(240, 216, 158, .18); background: rgba(105, 79, 38, .1); }
.question-grid .question-caution > span { color: var(--gold); }
.question-grid ul { margin-bottom: 0; color: #b8c6c5; font-size: 14px; }
.article-table-wrap { margin: 30px 0; overflow-x: auto; border: 1px solid rgba(240, 216, 158, .18); }
.article-table-wrap table { width: 100%; min-width: 600px; border-collapse: collapse; font-size: 14px; }
.article-table-wrap th, .article-table-wrap td { padding: 17px 18px; text-align: left; border-bottom: 1px solid rgba(240, 216, 158, .12); }
.article-table-wrap thead th { color: var(--gold-pale); background: rgba(189, 152, 83, .1); font-family: var(--serif); font-weight: 500; }
.article-table-wrap tbody th { color: var(--ivory); font-weight: 600; white-space: nowrap; }
.article-table-wrap tbody td { color: #abbdbc; }
.article-summary { margin-top: 76px; padding: 36px; border: 1px solid rgba(240, 216, 158, .28); background: radial-gradient(circle at 100% 0, rgba(40, 111, 107, .2), transparent 44%), rgba(4, 16, 22, .77); }
.article-summary .kicker { margin-bottom: 5px; }
.article-summary h2 { margin: 0 0 20px; padding: 0; }
.article-summary h2::before { content: none; }
.article-summary ul { margin: 0; }
.article-end-actions { margin-top: 31px; display: flex; flex-wrap: wrap; gap: 13px; }
.article-toc { padding: 23px 21px; position: sticky; top: 108px; border: 1px solid rgba(240, 216, 158, .17); background: rgba(5, 18, 24, .83); }
.article-toc > span { display: block; color: var(--gold); font-size: 9px; letter-spacing: .17em; }
.article-toc > strong { display: block; margin: 5px 0 14px; font-family: var(--serif); font-size: 15px; font-weight: 500; }
.article-toc nav { display: grid; }
.article-toc a { padding: 9px 0; color: #93a7a8; border-top: 1px solid rgba(240, 216, 158, .09); font-size: 12px; text-decoration: none; }
.article-toc a:hover { color: var(--gold-pale); }
.article-back { padding-bottom: 88px; }
.article-back a { color: var(--gold-pale); font-size: 14px; text-underline-offset: 5px; }

@media (max-width: 900px) {
  .article-grid { grid-template-columns: 1fr; }
  .article-card-image img { aspect-ratio: 1.8 / 1; }
  .article-card-copy { min-height: 0; }
  .article-layout { grid-template-columns: 1fr; gap: 52px; }
  .article-toc { grid-row: 1; position: static; }
  .article-toc nav { grid-template-columns: 1fr 1fr; column-gap: 22px; }
}

@media (max-width: 680px) {
  .column-hero { min-height: 440px; padding-block: 45px 67px; }
  .column-hero::after { right: -40px; font-size: 190px; }
  .column-hero .kicker { margin-top: 42px; }
  .column-hero h1 { font-size: 36px; }
  .column-hero-lead { font-size: 16px; }
  .column-index-section { padding-block: 72px 84px; }
  .column-section-heading { align-items: flex-start; flex-direction: column; gap: 10px; }
  .article-card-copy { padding: 29px 23px 26px; }
  .article-card-image img { aspect-ratio: 1.45 / 1; }
  .article-card h2 { font-size: 24px; }
  .column-callout { margin-block: 72px; padding: 30px 23px; align-items: stretch; flex-direction: column; }
  .column-callout .button { width: 100%; }
  .article-shell { padding-block: 42px 75px; }
  .article-header { margin-top: 42px; text-align: left; }
  .article-header h1 { font-size: 34px; }
  .article-lead { font-size: 16px; }
  .article-byline { justify-content: flex-start; }
  .article-hero-image img { aspect-ratio: 1.35 / 1; }
  .article-layout { margin-top: 50px; }
  .article-body { font-size: 16px; line-height: 2; }
  .article-body h2 { margin-top: 61px; font-size: 27px; }
  .article-answer { padding: 24px 20px; }
  .article-answer strong { font-size: 18px; }
  .article-inline-cta { align-items: stretch; flex-direction: column; padding: 23px 20px; }
  .article-inline-cta .button { width: 100%; }
  .question-grid { grid-template-columns: 1fr; }
  .article-summary { padding: 28px 22px; }
  .article-end-actions { align-items: stretch; flex-direction: column; }
  .article-end-actions .button { width: 100%; }
  .article-toc nav { grid-template-columns: 1fr; }
}


/* 200記事版: クラスター、関連記事、FAQ */
.column-cluster-nav { margin: 34px 0 2px; display: flex; flex-wrap: wrap; gap: 10px; }
.column-cluster-nav a { padding: 10px 15px; border: 1px solid rgba(240,216,158,.23); color: var(--gold-pale); background: rgba(8,29,36,.72); font-size: 12px; text-decoration: none; }
.column-cluster-nav a:hover { border-color: rgba(240,216,158,.52); background: rgba(25,57,62,.82); }
.column-cluster { scroll-margin-top: 90px; }
.column-cluster + .column-cluster { margin-top: 92px; padding-top: 80px; border-top: 1px solid rgba(240,216,158,.12); }
.column-cluster-heading { margin-bottom: 34px; display: flex; justify-content: space-between; align-items: end; gap: 28px; }
.column-cluster-heading h2 { margin: 0; font-family: var(--serif); font-size: clamp(29px,4vw,43px); font-weight: 500; }
.column-cluster-heading p { max-width: 470px; margin: 0; color: #96aaab; font-size: 14px; }
.column-count { color: var(--gold); font-size: 12px; letter-spacing: .12em; white-space: nowrap; }
.article-card h3 { margin: 0 0 17px; font-family: var(--serif); font-size: clamp(24px,3vw,31px); font-weight: 500; line-height: 1.6; letter-spacing: .035em; }
.article-card h3 a { text-decoration: none; }
.article-card h3 a:hover { color: var(--gold-pale); }
.article-related { margin: 54px 0 48px; padding: 28px 30px; border: 1px solid rgba(240,216,158,.2); background: rgba(189,152,83,.06); }
.article-related > span { color: var(--gold); font-size: 10px; font-weight: 700; letter-spacing: .14em; }
.article-related h2 { margin: 8px 0 19px; padding: 0; font-size: 23px; }
.article-related h2::before { display: none; }
.article-related ul { margin: 0; padding: 0; list-style: none; }
.article-related li { margin: 0; padding: 13px 0; border-top: 1px solid rgba(240,216,158,.11); }
.article-related a { display: flex; justify-content: space-between; gap: 20px; color: var(--gold-pale); text-underline-offset: 5px; }
.article-faq { margin-top: 72px; }
.article-faq details { margin: 13px 0; border: 1px solid rgba(240,216,158,.16); background: rgba(5,23,29,.62); }
.article-faq summary { padding: 20px 22px; color: var(--ivory); font-family: var(--serif); font-size: 16px; cursor: pointer; }
.article-faq details p { margin: 0; padding: 0 22px 22px; color: #afc0bf; font-size: 15px; }
.question-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; margin: 30px 0 38px; }
.question-grid > div { padding: 22px 20px; border: 1px solid rgba(104,197,184,.19); background: rgba(8,31,38,.65); }
.question-grid span { display: block; margin-bottom: 8px; color: var(--gold); font-family: var(--serif); }
.question-grid strong { display: block; min-height: 3.6em; font-family: var(--serif); font-size: 16px; line-height: 1.8; }
.question-grid p { margin: 10px 0 0; color: #a7b9b8; font-size: 14px; line-height: 1.85; }
@media (max-width: 760px) {
  .column-cluster-heading { align-items: start; flex-direction: column; gap: 10px; }
  .question-grid { grid-template-columns: 1fr; }
  .question-grid strong { min-height: 0; }
  .article-related { padding: 24px 20px; }
}