:root {
  --bg:#0a0e1a; --surface:#111827; --surface2:#1a2235; --border:#1e2d47;
  --accent:#6366f1; --accent2:#8b5cf6; --accent3:#06b6d4;
  --gold:#f59e0b; --green:#10b981; --red:#ef4444;
  --text:#e2e8f0; --text-muted:#64748b; --text-dim:#94a3b8;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{background:var(--bg);color:var(--text);font-family:'Hiragino Sans','Hiragino Kaku Gothic ProN','Noto Sans JP',sans-serif;line-height:1.7;}

/* HEADER */
header{background:linear-gradient(135deg,#0f172a 0%,#1e1b4b 50%,#0f172a 100%);border-bottom:1px solid var(--border);padding:0 24px;position:sticky;top:0;z-index:100;}
.header-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px;}
.logo{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:700;background:linear-gradient(135deg,var(--accent),var(--accent3));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-decoration:none;white-space:nowrap;}
.header-nav{display:flex;gap:4px;}
.nav-link{padding:6px 12px;border-radius:8px;font-size:13px;font-weight:600;color:var(--text-muted);text-decoration:none;transition:all 0.2s;}
.nav-link:hover{background:var(--surface2);color:var(--text);}
.nav-link.active{background:rgba(99,102,241,0.15);color:var(--accent);}

/* ARTICLE HERO */
.article-hero{background:linear-gradient(180deg,#1a1740 0%,var(--bg) 100%);padding:40px 24px 36px;border-bottom:1px solid var(--border);}
.article-hero-inner{max-width:760px;margin:0 auto;}
.breadcrumb{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-muted);margin-bottom:20px;flex-wrap:wrap;}
.breadcrumb a{color:var(--text-muted);text-decoration:none;transition:color 0.2s;}
.breadcrumb a:hover{color:var(--accent);}
.breadcrumb-sep{color:var(--border);}
.cat-badge{display:inline-block;padding:4px 12px;border-radius:999px;font-size:12px;font-weight:700;margin-bottom:16px;}
.cat-mac{background:rgba(59,130,246,0.15);color:#60a5fa;}
.cat-claude{background:rgba(139,92,246,0.15);color:#a78bfa;}
.cat-tool{background:rgba(16,185,129,0.15);color:#34d399;}
.cat-basic{background:rgba(245,158,11,0.15);color:#fbbf24;}
.article-title{font-size:clamp(22px,3.5vw,34px);font-weight:800;line-height:1.3;margin-bottom:16px;}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:16px;font-size:13px;color:var(--text-muted);}
.meta-item{display:flex;align-items:center;gap:5px;}
.article-lead{margin-top:20px;font-size:16px;color:var(--text-dim);line-height:1.8;border-left:3px solid var(--accent);padding-left:16px;}

/* LAYOUT */
.article-wrap{max-width:1100px;margin:0 auto;padding:40px 24px 80px;display:grid;grid-template-columns:1fr 240px;gap:40px;align-items:start;}
.article-body{min-width:0;}

/* TOC */
.toc{position:sticky;top:84px;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px 20px;}
.toc-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted);margin-bottom:12px;}
.toc-list{list-style:none;display:flex;flex-direction:column;gap:2px;}
.toc-list a{display:block;padding:5px 8px;border-radius:6px;font-size:13px;color:var(--text-dim);text-decoration:none;transition:all 0.2s;border-left:2px solid transparent;}
.toc-list a:hover{color:var(--accent);background:rgba(99,102,241,0.08);border-left-color:var(--accent);}
.toc-list a.active{color:var(--accent);background:rgba(99,102,241,0.1);border-left-color:var(--accent);}
.toc-list .toc-h3{padding-left:18px;font-size:12px;}

/* ARTICLE CONTENT */
.prose h2{font-size:22px;font-weight:700;margin:40px 0 16px;padding-top:8px;color:var(--text);scroll-margin-top:80px;}
.prose h2:first-child{margin-top:0;}
.prose h3{font-size:17px;font-weight:700;margin:28px 0 12px;color:var(--text);scroll-margin-top:80px;}
.prose p{font-size:15px;color:var(--text-dim);line-height:1.85;margin-bottom:16px;}
.prose strong{color:var(--text);font-weight:700;}
.prose ul,.prose ol{margin:12px 0 20px 20px;display:flex;flex-direction:column;gap:6px;}
.prose li{font-size:15px;color:var(--text-dim);line-height:1.7;}
.prose a{color:var(--accent);text-decoration:underline;text-decoration-color:rgba(99,102,241,0.4);transition:text-decoration-color 0.2s;}
.prose a:hover{text-decoration-color:var(--accent);}
.prose code{background:#0d1117;border:1px solid #30363d;border-radius:5px;padding:2px 7px;font-size:13px;color:#79c0ff;font-family:'SF Mono','Fira Code',monospace;}
.prose pre{background:#0d1117;border:1px solid #30363d;border-radius:10px;padding:18px 20px;overflow-x:auto;margin:16px 0 24px;}
.prose pre code{background:none;border:none;padding:0;font-size:13px;line-height:1.65;color:#e6edf3;}
.prose blockquote{border-left:3px solid var(--accent);margin:20px 0;padding:12px 18px;background:rgba(99,102,241,0.06);border-radius:0 8px 8px 0;}
.prose blockquote p{margin:0;font-style:italic;}
.prose hr{border:none;border-top:1px solid var(--border);margin:32px 0;}
.prose table{width:100%;border-collapse:collapse;font-size:14px;margin:16px 0 24px;}
.prose th{text-align:left;padding:10px 14px;background:var(--surface2);color:var(--text-muted);font-size:12px;text-transform:uppercase;letter-spacing:0.5px;border-bottom:1px solid var(--border);}
.prose td{padding:11px 14px;border-bottom:1px solid rgba(30,45,71,0.5);color:var(--text-dim);}
.prose tr:hover td{background:var(--surface2);}

/* CALLOUT BOXES */
.callout{border-radius:12px;padding:16px 18px;margin:20px 0;display:flex;gap:12px;align-items:flex-start;font-size:14px;line-height:1.7;}
.callout-icon{font-size:18px;flex-shrink:0;margin-top:1px;}
.callout p{margin:0;color:var(--text-dim);}
.callout.tip{background:rgba(6,182,212,0.08);border:1px solid rgba(6,182,212,0.2);}
.callout.warning{background:rgba(245,158,11,0.08);border:1px solid rgba(245,158,11,0.2);}
.callout.danger{background:rgba(239,68,68,0.08);border:1px solid rgba(239,68,68,0.2);}
.callout.note{background:rgba(99,102,241,0.08);border:1px solid rgba(99,102,241,0.2);}

/* KEY POINTS */
.key-points{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:20px 22px;margin:32px 0;}
.key-points-title{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--accent);margin-bottom:12px;}
.key-points ul{margin:0;list-style:none;display:flex;flex-direction:column;gap:8px;}
.key-points li{display:flex;align-items:flex-start;gap:8px;font-size:14px;color:var(--text-dim);line-height:1.6;}
.key-points li::before{content:'✓';color:var(--green);font-weight:700;flex-shrink:0;margin-top:1px;}

/* RELATED */
.related-section{max-width:1100px;margin:0 auto;padding:0 24px 60px;}
.related-title{font-size:18px;font-weight:700;margin-bottom:20px;display:flex;align-items:center;gap:10px;}
.related-title::after{content:'';flex:1;height:1px;background:var(--border);}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;}
.related-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px;text-decoration:none;display:flex;gap:12px;align-items:flex-start;transition:border-color 0.2s,transform 0.2s;}
.related-card:hover{border-color:var(--accent);transform:translateY(-2px);}
.related-icon{font-size:22px;flex-shrink:0;}
.related-info .related-cat{font-size:11px;color:var(--text-muted);margin-bottom:4px;}
.related-info .related-name{font-size:14px;font-weight:600;color:var(--text);line-height:1.4;}

/* CTA */
.article-cta{background:linear-gradient(135deg,#1e1b4b,#0f172a);border:1px solid rgba(99,102,241,0.3);border-radius:20px;padding:36px;text-align:center;margin:0 24px 60px;max-width:1052px;margin-left:auto;margin-right:auto;}
.article-cta h2{font-size:22px;font-weight:800;margin-bottom:10px;}
.article-cta p{color:var(--text-dim);font-size:14px;margin-bottom:22px;line-height:1.7;}
.cta-btn{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:white;font-size:15px;font-weight:700;padding:13px 28px;border-radius:10px;text-decoration:none;box-shadow:0 6px 20px rgba(99,102,241,0.3);transition:all 0.2s;}
.cta-btn:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(99,102,241,0.4);}

/* RESPONSIVE */
@media(max-width:768px){
  .article-wrap{grid-template-columns:1fr;}
  .toc{display:none;}
  .article-cta{margin:0 16px 48px;padding:28px 20px;}
}
@media(max-width:480px){
  .article-hero{padding:28px 16px 24px;}
  .article-wrap{padding:24px 16px 60px;}
}

/* SITE FOOTER (motive.co.jp style) */
.site-footer{background:#fff;color:#111;margin-top:0;}
.site-footer-inner{max-width:1100px;margin:0 auto;padding:56px 40px 40px;display:flex;justify-content:space-between;align-items:flex-start;gap:40px;}
.footer-logo{font-family:'Helvetica Neue',Arial,sans-serif;font-size:20px;font-weight:700;color:#111;text-decoration:none;letter-spacing:-0.5px;display:block;margin-bottom:16px;}
.footer-logo:hover{opacity:0.6;}
.footer-address{font-size:12px;color:#888;line-height:1.9;}
.footer-nav{display:flex;flex-direction:column;align-items:flex-end;gap:14px;}
.footer-nav a{font-size:12px;font-weight:600;color:#111;text-decoration:none;letter-spacing:0.08em;}
.footer-nav a:hover{opacity:0.5;}
.footer-bottom{max-width:1100px;margin:0 auto;padding:20px 40px 32px;display:flex;justify-content:space-between;align-items:center;border-top:1px solid #e8e8e8;}
.footer-copyright{font-size:11px;color:#aaa;font-family:'Helvetica Neue',Arial,sans-serif;}
.footer-bottom-nav{display:flex;gap:24px;}
.footer-bottom-nav a{font-size:11px;color:#888;text-decoration:none;}
.footer-bottom-nav a:hover{color:#111;}
@media(max-width:768px){
  .site-footer-inner{flex-direction:column-reverse;padding:40px 24px 32px;gap:32px;}
  .footer-nav{align-items:flex-start;}
  .footer-bottom{padding:16px 24px 28px;flex-direction:column;align-items:flex-start;gap:12px;}
}

/* TOC active tracking */