:root{--bg: #f7f9fb;--surface: #ffffff;--ink: #1b2733;--ink-soft: #51606e;--line: #e2e8ef;--brand: #0e7c7b;--brand-dark: #0a5a59;--accent: #f4a259;--max: 1080px;--radius: 14px;--shadow: 0 2px 14px rgba(20, 40, 60, .06);font-family:-apple-system,BlinkMacSystemFont,Hiragino Kaku Gothic ProN,Hiragino Sans,Noto Sans JP,Meiryo,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);line-height:1.8;font-size:16px}a{color:var(--brand-dark)}img{max-width:100%;height:auto}.container{max-width:var(--max);margin:0 auto;padding:0 20px}.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}.header-inner{display:flex;align-items:center;gap:24px;height:64px}.logo{font-weight:800;font-size:1.25rem;color:var(--brand-dark);text-decoration:none;letter-spacing:.02em;white-space:nowrap}.nav{display:flex;gap:18px;flex-wrap:wrap;font-size:.92rem}.nav a{color:var(--ink-soft);text-decoration:none}.nav a:hover{color:var(--brand-dark)}.hero{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-dark) 100%);color:#fff;padding:56px 0;margin-bottom:36px}.hero h1{margin:0 0 12px;font-size:1.9rem;line-height:1.4}.hero p{margin:0;opacity:.92;font-size:1.02rem}.section-title{font-size:1.35rem;margin:8px 0 20px;padding-left:12px;border-left:5px solid var(--brand)}section{margin-bottom:48px}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s}.card:hover{transform:translateY(-3px);box-shadow:0 6px 22px #14283c1a}.card-link{display:block;padding:20px;text-decoration:none;color:inherit}.card-cat{display:inline-block;font-size:.72rem;font-weight:700;color:var(--brand-dark);background:#e6f4f4;padding:3px 10px;border-radius:999px}.card-title{margin:12px 0 8px;font-size:1.05rem;line-height:1.5;color:var(--ink)}.card-desc{margin:0 0 12px;font-size:.88rem;color:var(--ink-soft);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.card-date{font-size:.78rem;color:#9aa7b3}.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.cat-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-decoration:none;color:inherit;box-shadow:var(--shadow)}.cat-card:hover{border-color:var(--brand)}.cat-card h3{margin:0 0 8px;color:var(--brand-dark)}.cat-card p{margin:0;font-size:.88rem;color:var(--ink-soft)}.article{max-width:760px;padding-top:28px;padding-bottom:60px}.breadcrumb{font-size:.82rem;color:var(--ink-soft);margin-bottom:16px}.breadcrumb a{color:var(--ink-soft);text-decoration:none}.article>h1{font-size:1.7rem;line-height:1.45;margin:6px 0 10px}.article>time{color:#9aa7b3;font-size:.82rem}.prose{margin-top:28px}.prose h2{font-size:1.3rem;margin:40px 0 14px;padding-bottom:8px;border-bottom:2px solid var(--line)}.prose h3{font-size:1.1rem;margin:28px 0 10px;color:var(--brand-dark)}.prose p{margin:0 0 18px}.prose ul,.prose ol{margin:0 0 18px;padding-left:1.4em}.prose li{margin-bottom:8px}.prose table{border-collapse:collapse;width:100%;margin:0 0 22px;font-size:.92rem}.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}.prose th{background:#eef4f4}.prose blockquote{border-left:4px solid var(--accent);margin:0 0 18px;padding:6px 16px;background:#fff8f0;color:var(--ink-soft)}.prose a{color:var(--brand-dark);text-underline-offset:2px}.site-footer{background:#11202b;color:#c4d0db;margin-top:60px;padding:40px 0 28px}.footer-cols{display:grid;grid-template-columns:1.4fr 1fr;gap:32px;margin-bottom:28px}.footer-logo{font-weight:800;font-size:1.1rem;color:#fff;margin-bottom:10px}.footer-desc{font-size:.85rem;opacity:.8;margin:0}.footer-nav{display:flex;flex-direction:column;gap:10px}.footer-nav a{color:#c4d0db;text-decoration:none;font-size:.88rem}.footer-nav a:hover{color:#fff}.copyright{font-size:.78rem;opacity:.6;text-align:center;border-top:1px solid rgba(255,255,255,.1);padding-top:18px;margin:0}@media(max-width:640px){.hero h1{font-size:1.5rem}.footer-cols{grid-template-columns:1fr}.nav{gap:12px;font-size:.85rem}}