:root{--bk2-ink:#1d2422;--bk2-muted:#6f7773;--bk2-paper:#f7f5ef;--bk2-sand:#e6dbc8;--bk2-green:#234e45;--bk2-green2:#2f6a5d;--bk2-line:#ddd8cd;--bk2-accent:#cf6a45}

/* Private full-page design preview */
.bk40-v2-preview-page #header-container,.bk40-v2-preview-page #navi,.bk40-v2-preview-page #breadcrumb,.bk40-v2-preview-page .breadcrumb,.bk40-v2-preview-page .sidebar,.bk40-v2-preview-page #sidebar,.bk40-v2-preview-page .entry-title,.bk40-v2-preview-page .date-tags,.bk40-v2-preview-page .sns-share,.bk40-v2-preview-page .sns-follow,.bk40-v2-preview-page .author-info,.bk40-v2-preview-page .footer{display:none!important}
.bk40-v2-preview-page #content,.bk40-v2-preview-page .content-in,.bk40-v2-preview-page main.main,.bk40-v2-preview-page article.entry{max-width:none!important;width:100%!important;margin:0!important;padding:0!important;background:#fff!important;border:0!important;box-shadow:none!important}
.bk40-v2-preview-page body,.bk40-v2-preview-page{background:#fff!important}
.bk40-v2-preview-page .entry-content{margin:0!important;padding:0!important}
.bk40v2-shell{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;color:var(--bk2-ink);background:#fff;max-width:1180px;margin:0 auto}
.bk40v2-shell a{text-decoration:none!important;color:inherit}
.bk40v2-header{background:var(--bk2-paper);border-bottom:1px solid var(--bk2-line)}
.bk40v2-headline{display:flex;align-items:center;justify-content:space-between;padding:24px 30px}
.bk40v2-brand{text-align:center}.bk40v2-brand small{display:block;color:var(--bk2-muted);font-size:13px;letter-spacing:.06em;margin-bottom:3px}.bk40v2-brand strong{display:block;font-size:30px;line-height:1.2;letter-spacing:-.02em}
.bk40v2-menuicon{width:36px;display:grid;gap:7px}.bk40v2-menuicon span{display:block;height:2px;background:var(--bk2-ink)}
.bk40v2-search{width:31px;height:31px;border:3px solid var(--bk2-ink);border-radius:50%;position:relative}.bk40v2-search:after{content:"";position:absolute;width:15px;height:3px;background:var(--bk2-ink);right:-10px;bottom:-5px;transform:rotate(48deg)}
.bk40v2-nav{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--bk2-line)}.bk40v2-nav a{padding:17px 8px;text-align:center;font-weight:800;font-size:15px;border-right:1px solid var(--bk2-line)}.bk40v2-nav a:last-child{border-right:0}
.bk40v2-hero{position:relative;min-height:430px;overflow:hidden;background:radial-gradient(circle at 74% 26%,rgba(255,255,255,.2),transparent 26%),linear-gradient(125deg,#183d35 0%,#315e53 54%,#a47f68 100%);color:#fff;display:grid;grid-template-columns:1.2fr .8fr;gap:25px;align-items:center;padding:62px 46px}
.bk40v2-hero:before{content:"";position:absolute;inset:-20%;background:repeating-linear-gradient(115deg,rgba(255,255,255,.035) 0 1px,transparent 1px 28px);transform:rotate(-4deg)}
.bk40v2-hero-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(5,20,16,.12),transparent)}
.bk40v2-hero-copy,.bk40v2-hero-stamps{position:relative;z-index:1}.bk40v2-eyebrow{display:inline-block;background:#fff;color:var(--bk2-green);border-radius:999px;padding:7px 11px;font-size:11px;font-weight:900;letter-spacing:.09em;margin-bottom:18px}
.bk40v2-hero h1{font-size:clamp(38px,5.2vw,62px)!important;line-height:1.15!important;letter-spacing:-.04em!important;color:#fff!important;margin:0 0 22px!important;padding:0!important;border:0!important}.bk40v2-hero p{font-size:18px;line-height:1.85;max-width:690px;color:rgba(255,255,255,.88);margin:0}
.bk40v2-hero-stamps{display:grid;grid-template-columns:1fr 1fr;gap:13px}.bk40v2-hero-stamps div{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);backdrop-filter:blur(4px);border-radius:18px;padding:18px}.bk40v2-hero-stamps strong{display:block;font-size:28px}.bk40v2-hero-stamps span{font-size:13px;color:rgba(255,255,255,.82)}
.bk40v2-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:34px;padding:56px 28px 70px}.bk40v2-section-title{display:flex;align-items:center;gap:14px;margin:0 0 26px}.bk40v2-section-title span{background:var(--bk2-sand);padding:13px 20px;font-size:25px;font-weight:900;position:relative}.bk40v2-section-title span:after{content:"";position:absolute;right:-16px;top:0;border-top:28px solid var(--bk2-sand);border-right:16px solid transparent}.bk40v2-section-title:after{content:"";height:1px;background:var(--bk2-line);flex:1}.bk40v2-latest-title{margin-top:48px}
.bk40v2-rank-list{display:grid;gap:30px}.bk40v2-rank-card{padding-bottom:27px;border-bottom:1px solid var(--bk2-line)}.bk40v2-rank-thumb{position:relative;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;overflow:hidden;background-size:cover;background-position:center}.bk40v2-rank-thumb:after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(0,0,0,.54),rgba(0,0,0,.03) 68%)}.bk40v2-rank-thumb.tone-green{background:linear-gradient(135deg,#90beb1,#2f6c5d)}.bk40v2-rank-thumb.tone-dark{background:linear-gradient(135deg,#1e2423,#6f3727)}.bk40v2-rank-thumb.tone-sand{background:linear-gradient(135deg,#d9c9ac,#a1744f)}.bk40v2-rank-no{position:absolute;z-index:3;left:0;top:0;width:54px;height:54px;background:#e9dec7;display:flex;align-items:center;justify-content:center;font-size:25px;font-weight:900;color:#111}.bk40v2-thumb-kicker{position:absolute;z-index:3;left:28px;bottom:94px;color:#fff;font-size:12px;font-weight:900;letter-spacing:.14em}.bk40v2-thumb-title{position:absolute;z-index:3;left:28px;right:28px;bottom:24px;color:#fff;font-size:clamp(27px,4vw,46px);line-height:1.12;font-weight:950;text-shadow:0 2px 10px rgba(0,0,0,.35)}.bk40v2-rank-card h2{font-size:27px!important;line-height:1.45!important;margin:16px 0 8px!important;padding:0!important;border:0!important}.bk40v2-rank-card p{color:var(--bk2-muted);line-height:1.8;margin:0}
.bk40v2-side{display:grid;gap:28px;align-content:start}.bk40v2-sidebox{border-top:3px solid var(--bk2-green);padding-top:17px}.bk40v2-sidebox h3{font-size:22px;margin:0 0 15px}.bk40v2-profile{background:var(--bk2-paper);padding:20px;border-radius:16px}.bk40v2-avatar{width:78px;height:78px;border-radius:24px;background:var(--bk2-green);color:#fff;display:flex;align-items:center;justify-content:center;font-size:30px;font-weight:950;margin-bottom:14px}.bk40v2-profile p{font-size:14px;line-height:1.75;color:var(--bk2-muted)}.bk40v2-tags{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}.bk40v2-tags span{border:1px solid var(--bk2-line);background:#fff;border-radius:999px;padding:5px 9px;font-size:11px}.bk40v2-rule-list{margin:0;padding-left:1.2em}.bk40v2-rule-list li{margin:.55em 0;line-height:1.6}
.bk40v2-latest-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.bk40v2-latest-card{border:1px solid var(--bk2-line);border-radius:14px;overflow:hidden;background:#fff}.bk40v2-latest-thumb{display:block;aspect-ratio:16/9;background:linear-gradient(135deg,#d8e8e4,#8fb6ab);background-size:cover;background-position:center}.bk40v2-latest-card>div{padding:13px}.bk40v2-latest-card span{font-size:11px;color:var(--bk2-muted)}.bk40v2-latest-card h3{font-size:16px!important;line-height:1.5!important;margin:5px 0!important}.bk40v2-private-note{margin:0 28px 45px;padding:15px 18px;border:1px solid var(--bk2-line);background:#f7f3ea;color:#675f53;border-radius:12px;font-size:13px}.bk40v2-empty{padding:25px;border:1px dashed var(--bk2-line);border-radius:14px;color:var(--bk2-muted)}

/* Rich article visual system */
.bk40v2-article{max-width:860px;margin:0 auto;font-size:17px;line-height:1.95}.bk40v2-article h2{font-size:clamp(25px,3.5vw,34px)!important;line-height:1.35!important;margin:2.2em 0 .8em!important;padding-left:14px!important;border-left:5px solid var(--bk2-green)!important}.bk40v2-lead{font-size:18px;line-height:1.95;margin-bottom:26px}.bk40v2-summary,.bk40v2-final{border:1px solid #d3ded9;background:linear-gradient(135deg,#f1f7f4,#fbfcfb);border-radius:18px;padding:22px 24px;margin:28px 0}.bk40v2-summary>span,.bk40v2-final>span{display:inline-block;background:#e4f0eb;color:var(--bk2-green);font-size:12px;font-weight:900;padding:5px 10px;border-radius:999px;margin-bottom:8px}.bk40v2-summary li{margin:.45em 0}.bk40v2-table-wrap{border:1px solid var(--bk2-line);border-radius:16px;overflow-x:auto;margin:28px 0;background:#fff}.bk40v2-table-title{padding:13px 15px;background:var(--bk2-paper);font-weight:900;border-bottom:1px solid var(--bk2-line)}.bk40v2-table-wrap table{width:100%;border-collapse:collapse;margin:0!important}.bk40v2-table-wrap th,.bk40v2-table-wrap td{padding:13px 15px;border-bottom:1px solid var(--bk2-line);vertical-align:top}.bk40v2-table-wrap th{width:30%;background:#fbfbf9;text-align:left}.bk40v2-toc{border:1px solid var(--bk2-line);border-radius:16px;padding:20px 22px;margin:28px 0}.bk40v2-toc strong{display:block;margin-bottom:8px}.bk40v2-toc li{margin:.35em 0}.bk40v2-article-image{margin:34px auto;text-align:center}.bk40v2-article-image img{max-width:100%;height:auto;border-radius:16px;border:1px solid var(--bk2-line);box-shadow:0 10px 35px rgba(20,30,40,.07)}.bk40v2-article-image figcaption{font-size:13px;color:var(--bk2-muted);margin-top:8px}.bk40v2-callout{padding:19px 21px;border-radius:15px;margin:28px 0;border:1px solid var(--bk2-line)}.bk40v2-callout>strong{display:block;font-size:18px;margin-bottom:5px}.bk40v2-callout.tone-good{background:#edf8ef}.bk40v2-callout.tone-warn{background:#fff6dc}.bk40v2-callout.tone-bad{background:#fff0f0}.bk40v2-callout.tone-info{background:#eef5ff}.bk40v2-compare-grid,.bk40v2-proscons-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:18px 0 30px}.bk40v2-compare-grid>div,.bk40v2-proscons-grid>div{border:1px solid var(--bk2-line);border-radius:16px;padding:19px;background:#fff}.bk40v2-proscons-grid .good{background:#edf8ef}.bk40v2-proscons-grid .bad{background:#fff0f0}.bk40v2-step-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:18px 0 30px}.bk40v2-step-grid>div{border:1px solid var(--bk2-line);border-radius:15px;padding:18px}.bk40v2-step-grid span{display:flex;width:32px;height:32px;align-items:center;justify-content:center;background:var(--bk2-green);color:#fff;border-radius:50%;font-weight:900;margin-bottom:9px}.bk40v2-step-grid strong{display:block}.bk40v2-step-grid p{font-size:13px;line-height:1.6;color:var(--bk2-muted)}
.bk40v2-related{max-width:860px;margin:42px auto 10px}.bk40v2-related-label{font-weight:900;font-size:22px;margin-bottom:14px}.bk40v2-related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.bk40v2-related-grid>a{border:1px solid var(--bk2-line);border-radius:13px;overflow:hidden;background:#fff;text-decoration:none!important;color:var(--bk2-ink)!important}.bk40v2-related-thumb{display:block;aspect-ratio:16/9;background:linear-gradient(135deg,#d7e7e3,#92b8ae);background-size:cover;background-position:center}.bk40v2-related-grid strong{display:block;padding:11px 12px;line-height:1.5;font-size:14px}

@media(max-width:900px){.bk40v2-hero{grid-template-columns:1fr;padding:48px 24px}.bk40v2-layout{grid-template-columns:1fr;padding:40px 20px 60px}.bk40v2-side{grid-template-columns:1fr 1fr}.bk40v2-nav{grid-template-columns:repeat(3,1fr)}.bk40v2-nav a:nth-child(n+4){border-top:1px solid var(--bk2-line)}.bk40v2-step-grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.bk40v2-headline{padding:18px 20px}.bk40v2-brand strong{font-size:24px}.bk40v2-brand small{font-size:11px}.bk40v2-menuicon{width:30px}.bk40v2-search{width:26px;height:26px}.bk40v2-nav{grid-template-columns:repeat(2,1fr)}.bk40v2-nav a{font-size:14px;padding:15px 5px}.bk40v2-hero{padding:42px 22px 36px}.bk40v2-hero h1{font-size:37px!important}.bk40v2-hero p{font-size:16px}.bk40v2-hero-stamps{grid-template-columns:1fr 1fr}.bk40v2-hero-stamps div{padding:14px}.bk40v2-hero-stamps strong{font-size:23px}.bk40v2-section-title span{font-size:21px}.bk40v2-rank-card h2{font-size:22px!important}.bk40v2-thumb-title{font-size:30px;left:20px;right:20px}.bk40v2-thumb-kicker{left:20px}.bk40v2-side{grid-template-columns:1fr}.bk40v2-latest-grid{grid-template-columns:1fr}.bk40v2-compare-grid,.bk40v2-proscons-grid,.bk40v2-step-grid,.bk40v2-related-grid{grid-template-columns:1fr}.bk40v2-article{font-size:16px}.bk40v2-table-wrap th{width:38%}}

/* v2.1 live-home fixes */
.bk40-v21-live-home .entry-title,
.bk40-v21-live-home .page-title,
.bk40-v21-live-home article.page > header,
.bk40-v21-live-home .article-header,
.bk40-v21-live-home .post-meta,
.bk40-v21-live-home .breadcrumb,
.bk40-v21-live-home #breadcrumb {display:none!important}
.bk40-v21-live-home .entry-content{margin-top:0!important}
.bk40-v21-live-home .main,
.bk40-v21-live-home main,
.bk40-v21-live-home .entry-content{max-width:none!important;width:100%!important;padding-left:0!important;padding-right:0!important}
.bk40-v21-live-home .content-in,
.bk40-v21-live-home .content{max-width:1180px!important;margin-left:auto!important;margin-right:auto!important}
.bk40v21-topic-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin:25px 0}
.bk40v21-topic-grid a{display:flex;flex-direction:column;gap:7px;padding:18px;border:1px solid #ddd8cd;border-radius:14px;background:#fff;text-decoration:none!important;color:#1d2422!important}
.bk40v21-topic-grid strong{font-size:16px}.bk40v21-topic-grid span{font-size:12px;line-height:1.6;color:#6f7773}
@media(max-width:800px){.bk40v21-topic-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.bk40v21-topic-grid{grid-template-columns:1fr}}