:root{--ink:#12201d;--ink-soft:#4a5a56;--line:#dfe7e4;--bg:#fff;--bg-soft:#f3f8f6;--brand:#0e3b33;--brand-2:#1a5c4f;--accent:#2fd39a;--accent-ink:#0a6b4b;--warm:#ffcf4a;--radius:16px;--max:1080px;--font:"Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, system-ui, sans-serif}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);font-family:var(--font);letter-spacing:.02em;font-feature-settings:"palt";margin:0;font-size:16px;line-height:1.85}img{max-width:100%;height:auto}a{color:var(--accent-ink)}.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}.site-header{z-index:10;backdrop-filter:saturate(160%)blur(10px);border-bottom:1px solid var(--line);background:#ffffffeb;position:sticky;top:0}.site-header .wrap{justify-content:space-between;align-items:center;gap:16px;height:64px;display:flex}.logo{color:var(--brand);letter-spacing:.04em;white-space:nowrap;flex:none;align-items:center;gap:10px;font-size:20px;font-weight:800;text-decoration:none;display:inline-flex}.logo img{width:32px;height:32px}.logo small{color:var(--accent-ink);border:1px solid var(--accent);border-radius:999px;padding:1px 8px;font-size:12px;font-weight:700}.nav{align-items:center;gap:18px;font-size:14px;font-weight:700;display:flex}.nav a{color:var(--ink);text-decoration:none}.nav a:hover{color:var(--accent-ink)}@media (width<=640px){.nav{gap:12px}.nav .hide-sp{display:none}}.nav a{white-space:nowrap}.btn{white-space:nowrap;border-radius:999px;justify-content:center;align-items:center;gap:8px;min-height:48px;padding:12px 26px;font-weight:800;line-height:1.4;text-decoration:none;transition:transform .15s,box-shadow .15s;display:inline-flex}.btn:hover{transform:translateY(-1px)}.btn-primary{background:var(--accent);color:var(--brand);box-shadow:0 6px 18px #2fd39a59}.btn-ghost{color:#fff;border:2px solid #ffffff80}.btn-small{min-height:38px;padding:6px 16px;font-size:14px}.section{padding:88px 0}.section-soft{background:var(--bg-soft)}.eyebrow{letter-spacing:.16em;color:var(--accent-ink);margin-bottom:10px;font-size:13px;font-weight:800;display:inline-block}.section h2{margin:0 0 18px;font-size:clamp(24px,4.2vw,36px);line-height:1.45}.lead{color:var(--ink-soft);max-width:720px;margin:0 0 40px}.grid{gap:20px;display:grid}.grid-3{grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}.grid-2{grid-template-columns:repeat(auto-fit,minmax(min(100%,420px),1fr))}.card{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:26px}.card h3{margin:0 0 8px;font-size:18px;line-height:1.5}.card p{color:var(--ink-soft);margin:0;font-size:15px}.site-footer{background:var(--brand);color:#ffffffd1;padding:48px 0 32px;font-size:14px}.site-footer a{color:#fff}.footer-grid{flex-wrap:wrap;justify-content:space-between;gap:24px;display:flex}.footer-links{flex-wrap:wrap;gap:8px 20px;margin:0;padding:0;list-style:none;display:flex}.footer-note{color:#fff9;margin-top:28px;font-size:12px}.prose{max-width:760px;margin:0 auto;font-size:17px}.prose h2{border-bottom:3px solid var(--accent);margin:56px 0 16px;padding:0 0 10px;font-size:24px;line-height:1.5}.prose h3{border-left:5px solid var(--brand-2);margin:36px 0 12px;padding-left:12px;font-size:20px}.prose p{margin:0 0 1.4em}.prose ul,.prose ol{margin:0 0 1.4em;padding-left:1.4em}.prose li{margin:.3em 0}.prose table{border-collapse:collapse;width:100%;margin:0 0 1.6em;font-size:15px;display:block;overflow-x:auto}.prose th,.prose td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:10px 12px}.prose th{background:var(--bg-soft);white-space:nowrap}.prose blockquote{background:var(--bg-soft);border-left:4px solid var(--accent);border-radius:0 10px 10px 0;margin:0 0 1.4em;padding:14px 18px}.prose code{background:var(--bg-soft);border-radius:6px;padding:2px 6px;font-size:.9em}.prose pre{color:#e8f3ef;background:#10201c;border-radius:12px;padding:16px;font-size:14px;line-height:1.6;overflow-x:auto}.prose pre code{background:0 0;padding:0}.tag{color:var(--accent-ink);background:#e3f8f0;border-radius:999px;padding:2px 10px;font-size:12px;font-weight:800;text-decoration:none;display:inline-block}.muted{color:var(--ink-soft);font-size:14px}