:root{--bg:#f6f8fc;--card:#fff;--ink:#172033;--muted:#627087;--line:#e4e9f2;--brand:#0B2A4A;--brand2:#1f8f83;--accent:#ffb547;--shadow:0 12px 35px rgba(27,45,94,.08);--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",Meiryo,sans-serif;color:var(--ink);background:var(--bg);line-height:1.8}a{color:inherit}.container{width:min(1120px,calc(100% - 32px));margin:auto}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.header-inner{height:70px;display:flex;align-items:center;gap:24px}.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:900;font-size:21px;white-space:nowrap}.logo-mark{width:38px;height:38px;border-radius:13px;display:grid;place-items:center;color:white;background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 6px 18px rgba(11,42,74,.25)}nav{margin-left:auto;display:flex;gap:20px;font-size:14px;font-weight:700}nav a{text-decoration:none;color:#3d4960}.menu-btn{display:none;margin-left:auto;border:0;background:none;font-size:24px}.hero{padding:76px 0 54px;background:radial-gradient(circle at 85% 20%,rgba(34,184,167,.16),transparent 32%),radial-gradient(circle at 12% 10%,rgba(83,103,255,.15),transparent 30%)}.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:40px;align-items:center}.eyebrow{display:inline-flex;padding:7px 13px;border-radius:999px;background:#e8ecff;color:#394ed7;font-weight:800;font-size:13px}.hero h1{font-size:clamp(36px,5vw,64px);line-height:1.14;letter-spacing:-.04em;margin:18px 0}.hero p{font-size:18px;color:var(--muted);max-width:720px}.hero-card{background:var(--card);border:1px solid var(--line);padding:28px;border-radius:28px;box-shadow:var(--shadow);transform:rotate(2deg)}.hero-card .mini{font-size:13px;color:var(--muted)}.hero-card 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13px;cursor:pointer;font-weight:700;color:#4e5b70}.chip.active{background:var(--ink);color:white}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.article-card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 8px 25px rgba(25,37,70,.04);transition:.2s}.article-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.thumb{height:145px;padding:22px;background:linear-gradient(135deg,#edf0ff,#e8fbf8);display:flex;align-items:end;justify-content:space-between}.thumb-icon{font-size:40px}.badge{display:inline-flex;border-radius:999px;background:white;padding:6px 11px;font-size:12px;font-weight:800;color:#45516a}.card-body{padding:21px;display:flex;flex-direction:column;flex:1}.article-card h3{font-size:19px;line-height:1.55;margin:0 0 10px}.article-card p{color:var(--muted);font-size:14px;margin:0}.card-link{margin-top:auto;padding-top:16px;color:var(--brand);font-weight:800;text-decoration:none}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.feature{background:white;border:1px solid var(--line);padding:25px;border-radius:var(--radius)}.feature b{display:block;font-size:18px;margin:10px 0}.site-footer{background:#172033;color:#dbe3f4;padding:52px 0 28px}.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:35px}.footer-grid a{color:#dbe3f4;text-decoration:none;display:block;margin:7px 0}.copyright{border-top:1px solid #35405a;margin-top:32px;padding-top:20px;font-size:13px;color:#aebbd2}.page-hero{padding:46px 0 26px}.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:18px}.breadcrumbs a{text-decoration:none}.article-layout{display:grid;grid-template-columns:minmax(0,760px) 280px;gap:34px;align-items:start}.article-main{background:white;border:1px solid var(--line);border-radius:24px;padding:clamp(22px,5vw,48px);box-shadow:var(--shadow)}.article-main h1{font-size:clamp(29px,4vw,43px);line-height:1.35;letter-spacing:-.025em;margin:10px 0 16px}.meta{display:flex;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:13px;border-bottom:1px solid var(--line);padding-bottom:24px}.lead{font-size:17px;background:#f1f4ff;border-left:5px solid var(--brand);padding:22px;border-radius:0 15px 15px 0;margin:28px 0}.article-main h2{font-size:27px;line-height:1.45;margin:48px 0 18px;padding-bottom:10px;border-bottom:3px solid #e7eaff}.article-main h3{font-size:21px;margin:30px 0 10px}.steps{counter-reset:item;list-style:none;padding:0}.steps li{position:relative;padding:18px 18px 18px 62px;border:1px solid var(--line);border-radius:14px;margin:12px 0;background:#fff}.steps li:before{counter-increment:item;content:counter(item);position:absolute;left:17px;top:16px;width:31px;height:31px;display:grid;place-items:center;background:var(--brand);color:white;border-radius:10px;font-weight:900}.prompt-box{position:relative;background:#111a2b;color:#edf2ff;border-radius:16px;padding:24px;margin:20px 0;white-space:pre-wrap;font-size:14px}.copy-btn{position:absolute;right:10px;top:10px;border:1px solid #56617a;background:#26324a;color:white;border-radius:9px;padding:7px 10px;cursor:pointer}.check-list{padding:0;list-style:none}.check-list li{padding:10px 0 10px 31px;position:relative;border-bottom:1px solid var(--line)}.check-list li:before{content:'✓';position:absolute;left:3px;color:var(--brand2);font-weight:900}.faq details{border:1px solid var(--line);border-radius:13px;padding:15px 17px;margin:11px 0}.faq summary{cursor:pointer;font-weight:800}.source-list{font-size:14px}.source-list a{color:var(--brand)}.sidebar{position:sticky;top:92px}.side-card{background:white;border:1px solid var(--line);border-radius:18px;padding:20px;margin-bottom:18px}.side-card h3{margin:0 0 12px;font-size:17px}.side-card a{display:block;text-decoration:none;padding:10px 0;border-bottom:1px solid var(--line);font-size:14px;font-weight:700}.toc a{font-weight:500}.notice{background:#fff8e8;border:1px solid #f2d695;border-radius:14px;padding:18px;margin:24px 0}.static-page{max-width:850px;margin:38px auto 70px;background:white;border:1px solid var(--line);border-radius:24px;padding:clamp(24px,5vw,50px)}.static-page h1{font-size:38px}.static-page h2{margin-top:38px}.hidden{display:none!important}@media(max-width:900px){.hero-grid,.article-layout{grid-template-columns:1fr}.hero-card{display:none}.grid{grid-template-columns:repeat(2,1fr)}.sidebar{position:static}.footer-grid{grid-template-columns:1fr 1fr}.feature-grid{grid-template-columns:1fr}}@media(max-width:640px){nav{display:none;position:absolute;top:70px;left:0;right:0;background:white;padding:20px 24px;border-bottom:1px solid var(--line);flex-direction:column}nav.open{display:flex}.menu-btn{display:block}.grid{grid-template-columns:1fr}.hero{padding-top:48px}.section{padding:45px 0}.footer-grid{grid-template-columns:1fr}.article-main{border-radius:0;border-left:0;border-right:0}.container.article-container{width:100%}.page-hero .container{width:calc(100% - 32px)}.article-layout{gap:20px}.sidebar{padding:0 16px}.section-title{display:block}.section-title p{margin-top:8px}}