:root{--ink:#111;--ink-soft:#2b2b2b;--muted:#6b6b6b;--line:#e7e5e0;--line-2:#d9d6cf;--paper:#fff;--cream:#f7f5f0;--cream-2:#efece4;--accent:#1b6b3a;--accent-ink:#0f4a27;--line-green:#06c755;--terra:#a8471f}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans JP",system-ui,sans-serif;-webkit-font-smoothing:antialiased;font-feature-settings:"palt"}
body{font-size:15px;line-height:1.95}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.serif{font-family:"Shippori Mincho",serif;font-weight:500}
.wrap{max-width:1240px;margin:0 auto;padding:0 32px}
.wrap-narrow{max-width:780px;margin:0 auto;padding:0 32px}

.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:72px;padding:0 32px;max-width:1240px;margin:0 auto}
.logo{display:flex;align-items:center;gap:10px;font-weight:600;font-family:"Shippori Mincho",serif;font-size:18px}
.logo-mark{width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-family:"Cormorant Garamond",serif;font-size:18px;font-weight:600}
nav.main{display:flex;gap:30px;font-size:13px;font-weight:500}
nav.main a{color:var(--ink-soft);transition:.2s}
nav.main a:hover,nav.main a.is-current{color:var(--accent)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:999px;font-size:13px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:.2s;white-space:nowrap}
.btn-line{background:var(--line-green);color:#fff;border-color:var(--line-green)}.btn-line:hover{background:#05a848;border-color:#05a848}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--ink)}.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-accent{background:var(--accent);color:#fff}.btn-accent:hover{background:var(--accent-ink);transform:translateY(-1px)}
.btn-xl{padding:18px 32px;font-size:14px}
.top-ctas{display:flex;gap:10px}

.crumb{padding:18px 0;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line)}
.crumb a{color:var(--muted)}.crumb a:hover{color:var(--accent)}.crumb span{margin:0 10px;opacity:.5}

.article-head{padding:64px 0 40px;background:linear-gradient(180deg,var(--cream) 0%,#fff 100%);position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.article-head::before{content:"AI · INSIGHT";position:absolute;top:30px;right:-40px;font-family:"Cormorant Garamond",serif;font-size:180px;font-weight:500;color:rgba(27,107,58,.05);letter-spacing:.05em;line-height:1;pointer-events:none;white-space:nowrap}
.article-meta{display:flex;align-items:center;gap:14px;margin-bottom:18px;flex-wrap:wrap;position:relative;z-index:1}
.article-cat{font-family:"Cormorant Garamond",serif;font-size:11px;letter-spacing:.2em;color:#fff;background:var(--accent);padding:5px 12px;text-transform:uppercase;font-weight:600}
.article-tag{font-size:11px;font-weight:600;color:var(--accent);background:rgba(27,107,58,.08);padding:4px 10px;border-radius:999px}
.article-date{font-family:"Cormorant Garamond",serif;font-size:12px;color:var(--muted);letter-spacing:.05em;font-weight:500}
h1.article-title{font-family:"Shippori Mincho",serif;font-weight:500;font-size:34px;line-height:1.55;letter-spacing:.02em;margin:0 0 20px;position:relative;z-index:1}
.article-lead{font-size:15.5px;color:var(--ink-soft);line-height:2;max-width:720px;position:relative;z-index:1;background:rgba(255,255,255,.7);border-left:4px solid var(--accent);padding:22px 28px;margin-top:8px;border-radius:0 4px 4px 0;backdrop-filter:blur(2px)}
.article-lead::before{content:'"';position:absolute;top:-12px;left:20px;font-family:"Cormorant Garamond",serif;font-size:64px;color:var(--accent);opacity:.22;line-height:1;font-weight:600}
.article-info{display:flex;align-items:center;gap:18px;margin-top:26px;padding-top:20px;border-top:1px dashed var(--line);font-size:12px;color:var(--muted);position:relative;z-index:1;flex-wrap:wrap}
.author-mini{display:flex;align-items:center;gap:10px}
.author-mini-icon{width:36px;height:36px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-family:"Shippori Mincho",serif;font-size:14px;font-weight:600}
.author-mini-name{font-family:"Shippori Mincho",serif;font-weight:600;color:var(--ink);font-size:13px}

.article{padding:56px 0 80px}
.toc{background:var(--cream);border-left:3px solid var(--accent);padding:24px 28px;margin:0 0 48px}
.toc-ttl{font-family:"Cormorant Garamond",serif;font-size:11px;letter-spacing:.25em;color:var(--accent);font-weight:600;text-transform:uppercase;margin-bottom:14px}
.toc ol{margin:0;padding-left:22px;font-size:13.5px;line-height:2;color:var(--ink-soft)}
.toc ol a{color:var(--ink-soft);transition:.15s}
.toc ol a:hover{color:var(--accent)}

.article h2{font-family:"Shippori Mincho",serif;font-weight:600;font-size:26px;line-height:1.5;margin:80px 0 24px;padding-bottom:16px;border-bottom:1px solid var(--line);position:relative}
.article h2::before{content:"";position:absolute;bottom:-1px;left:0;width:60px;height:3px;background:var(--accent)}
.article h2:first-of-type{margin-top:48px}
.article h3{font-family:"Shippori Mincho",serif;font-weight:600;font-size:19px;line-height:1.55;margin:44px 0 16px;color:var(--accent-ink);padding-left:14px;border-left:3px solid var(--accent);min-height:24px;display:flex;align-items:center}
.article p{font-size:15.5px;color:var(--ink-soft);line-height:2.1;margin:0 0 22px}
.article p + p{margin-top:0}
.article ul,.article ol{font-size:15.5px;color:var(--ink-soft);line-height:2.1;padding-left:26px;margin:0 0 22px}
.article ul li::marker{color:var(--accent);font-size:1.1em}
.article ol li::marker{color:var(--accent);font-weight:600}
.article li{margin-bottom:8px}
.article strong{color:var(--accent-ink);font-weight:600;background:linear-gradient(transparent 62%,rgba(27,107,58,.18) 62%);padding:0 1px}
.article em{font-style:normal;color:var(--terra);font-weight:600}
.article blockquote{margin:32px 0;padding:24px 28px 24px 32px;background:linear-gradient(135deg,var(--cream) 0%,#fff 100%);border-left:4px solid var(--accent);font-size:14.5px;color:var(--ink-soft);line-height:2;position:relative;border-radius:0 4px 4px 0}
.article blockquote::before{content:"";position:absolute;top:18px;left:14px;width:6px;height:6px;background:var(--accent);border-radius:50%}
.article blockquote p:last-child{margin:0}

/* ハイライトボックス（重要強調） */
.article .highlight-box{margin:36px 0;padding:24px 28px;background:linear-gradient(135deg,#fff 0%,var(--cream) 100%);border:1px solid var(--terra);border-left-width:4px;position:relative;box-shadow:0 4px 12px rgba(168,71,31,.05)}
.article .highlight-box-ttl{font-family:"Shippori Mincho",serif;font-weight:600;color:var(--terra);font-size:13px;letter-spacing:.15em;text-transform:uppercase;margin:0 0 10px;display:flex;align-items:center;gap:8px}
.article .highlight-box-ttl::before{content:"!";display:grid;place-items:center;width:20px;height:20px;background:var(--terra);color:#fff;border-radius:50%;font-family:"Cormorant Garamond",serif;font-weight:600;font-size:12px}

/* 大きい数字バッジ（数値強調） */
.article .num-big{display:inline-block;font-family:"Cormorant Garamond",serif;font-size:20px;font-weight:600;color:var(--accent);padding:0 4px;letter-spacing:.02em;line-height:1}
.article .num-huge{display:inline-block;font-family:"Cormorant Garamond",serif;font-size:38px;font-weight:600;color:var(--accent);line-height:1;vertical-align:-4px;margin:0 4px;letter-spacing:.02em}

/* 画像挿入プレースホルダ */
.article .img-here{margin:36px 0;aspect-ratio:16/9;background:linear-gradient(135deg,var(--cream-2),var(--cream));border:1px dashed var(--line-2);display:grid;place-items:center;font-family:"Cormorant Garamond",serif;font-size:11px;color:var(--muted);letter-spacing:.25em;text-transform:uppercase;border-radius:2px}
.article .img-here::before{content:"📷  Image placeholder"}
.article figure{margin:36px 0;text-align:center}
.article figure img{width:100%;height:auto;border:1px solid var(--line);border-radius:2px}
.article figure figcaption{font-size:12px;color:var(--muted);margin-top:10px;font-style:italic}

/* 読了プログレスバー（CSSのみで実装） */
.read-progress-wrap{position:fixed;top:0;left:0;right:0;height:3px;background:rgba(27,107,58,.06);z-index:100;pointer-events:none}
.read-progress{height:100%;background:linear-gradient(90deg,var(--accent),var(--terra));width:var(--progress,0%);transition:width 80ms linear}
.article pre{background:#1a1a1a;color:#e8e8e8;padding:18px 22px;font-size:13px;line-height:1.7;overflow-x:auto;margin:18px 0;border-radius:4px;font-family:"SF Mono",Consolas,monospace}
.article code{font-family:"SF Mono",Consolas,monospace;font-size:13px;background:var(--cream);padding:2px 6px;border-radius:3px;color:var(--accent-ink)}
.article pre code{background:none;padding:0;color:#e8e8e8}

.callout{margin:28px 0;padding:24px 28px;background:#fff;border:1px solid var(--accent);border-left-width:4px;position:relative}
.callout-ttl{font-family:"Shippori Mincho",serif;font-weight:600;color:var(--accent);font-size:14px;margin:0 0 8px;letter-spacing:.05em}
.callout p{margin:0;font-size:13.5px;line-height:1.95;color:var(--ink-soft)}

.step{margin:24px 0;padding:24px 28px;background:var(--cream);border:1px solid var(--line)}
.step-num{display:inline-block;font-family:"Cormorant Garamond",serif;font-size:12px;letter-spacing:.2em;color:#fff;background:var(--accent);padding:4px 12px;font-weight:600;margin-bottom:10px}
.step h4{font-family:"Shippori Mincho",serif;font-size:17px;margin:0 0 10px;color:var(--ink)}
.step p{margin:0 0 8px;font-size:14px;line-height:2}

table.compare{width:100%;border-collapse:collapse;margin:24px 0;font-size:13px}
table.compare th,table.compare td{padding:12px 14px;border:1px solid var(--line);text-align:left;vertical-align:top}
table.compare th{background:var(--cream);font-family:"Shippori Mincho",serif;font-weight:600;color:var(--ink)}
table.compare td strong{background:none;color:var(--accent)}

.faq{padding:64px 0;background:var(--cream);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.faq-head{margin-bottom:36px}
.faq-eng{font-family:"Cormorant Garamond",serif;font-size:13px;letter-spacing:.25em;color:var(--accent);font-weight:600;text-transform:uppercase}
.faq-ttl{font-family:"Shippori Mincho",serif;font-size:26px;font-weight:500;margin:8px 0 0;line-height:1.5}
.faq-list{display:flex;flex-direction:column;gap:14px}
.faq-item{background:#fff;border:1px solid var(--line);padding:20px 24px;transition:.2s}
.faq-item:hover{border-color:var(--accent)}
.faq-q{font-family:"Shippori Mincho",serif;font-weight:600;font-size:15px;color:var(--ink);margin:0 0 10px;display:flex;align-items:flex-start;gap:10px;line-height:1.7}
.faq-q::before{content:"Q.";color:var(--accent);font-family:"Cormorant Garamond",serif;font-size:18px;font-weight:600;flex-shrink:0;line-height:1.5}
.faq-a{font-size:13.5px;color:var(--ink-soft);line-height:1.95;margin:0;display:flex;align-items:flex-start;gap:10px}
.faq-a::before{content:"A.";color:var(--muted);font-family:"Cormorant Garamond",serif;font-size:16px;font-weight:600;flex-shrink:0;line-height:1.5}

.author{padding:56px 0;background:#fff;border-bottom:1px solid var(--line)}
.author-card{display:grid;grid-template-columns:120px 1fr;gap:28px;align-items:center;background:var(--cream);padding:32px;border-left:3px solid var(--accent)}
.author-icon{width:120px;height:120px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-family:"Shippori Mincho",serif;font-size:32px;font-weight:600}
.author-name{font-family:"Shippori Mincho",serif;font-size:20px;font-weight:600;margin:0 0 4px}
.author-role{font-size:12px;color:var(--accent);font-weight:600;margin-bottom:10px;font-family:"Cormorant Garamond",serif;letter-spacing:.1em}
.author-bio{font-size:13px;color:var(--ink-soft);line-height:1.95;margin:0}

.related{padding:56px 0;background:#fff}
.related-head{margin-bottom:32px}
.related-eng{font-family:"Cormorant Garamond",serif;font-size:13px;letter-spacing:.25em;color:var(--accent);font-weight:600;text-transform:uppercase}
.related-ttl{font-family:"Shippori Mincho",serif;font-size:24px;font-weight:500;margin:8px 0 0}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.related-card{background:#fff;border:1px solid var(--line);padding:22px 24px;transition:.25s;display:block}
.related-card:hover{transform:translateY(-3px);box-shadow:0 16px 32px -20px rgba(27,107,58,.2);border-color:var(--accent)}
.related-card-tag{font-size:10px;font-weight:600;color:var(--accent);background:rgba(27,107,58,.08);padding:3px 9px;border-radius:999px;display:inline-block;margin-bottom:10px}
.related-card-title{font-family:"Shippori Mincho",serif;font-size:14.5px;font-weight:600;line-height:1.65;margin:0 0 8px;color:var(--ink)}
.related-card-meta{font-size:11px;color:var(--muted);font-family:"Cormorant Garamond",serif;letter-spacing:.08em}

.cta{background:var(--accent);color:#fff;text-align:center;padding:80px 0;position:relative;overflow:hidden}
.cta::before{content:"FREE LINE CHAT";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-family:"Cormorant Garamond",serif;font-size:200px;font-weight:600;color:rgba(255,255,255,.05);letter-spacing:.05em;line-height:1;pointer-events:none;white-space:nowrap}
.cta-inner{position:relative;z-index:1;max-width:780px;margin:0 auto;padding:0 32px}
.cta-eng{font-family:"Cormorant Garamond",serif;font-size:13px;letter-spacing:.3em;color:rgba(255,255,255,.7);text-transform:uppercase;margin-bottom:18px}
.cta h2{font-family:"Shippori Mincho",serif;font-size:28px;font-weight:500;line-height:1.55;margin:0 0 24px}
.cta p{font-size:14px;color:rgba(255,255,255,.85);margin:0 0 32px;line-height:2}
.cta-buttons{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.cta .btn-line{background:#06c755;color:#fff;border-color:#06c755}.cta .btn-line:hover{background:#05a848}
.cta .btn-ghost{background:transparent;color:#fff;border-color:#fff}.cta .btn-ghost:hover{background:#fff;color:var(--accent)}

footer{background:var(--ink);color:#aaa;padding:48px 0 32px;font-size:12px}
.foot-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px}
.foot-inner a{color:#aaa;transition:.2s}.foot-inner a:hover{color:#fff}
.foot-links{display:flex;gap:24px;flex-wrap:wrap}

@media (max-width:880px){
  .wrap,.wrap-narrow{padding:0 22px}.topbar-inner{padding:0 22px}
  nav.main,.top-ctas .btn-ghost{display:none}
  h1.article-title{font-size:23px}
  .article h2{font-size:20px}
  .article h3{font-size:16px}
  .author-card{grid-template-columns:1fr;text-align:center}
  .author-icon{margin:0 auto}
  .related-grid{grid-template-columns:1fr}
  .cta h2{font-size:22px}
}