:root{--bg:#0b1220;--panel:#121b2e;--panel2:#ffffff;--text:#1c2333;--muted:#5f6b85;--line:#d9e1ef;--accent:#1f6feb;--accent2:#0f8b8d;--light:#f3f7fd;}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;color:var(--text);background:#eef3fa;line-height:1.8}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.wrap{width:min(1120px,calc(100% - 32px));margin:0 auto}
.site-header{background:linear-gradient(135deg,#0d172a,#182641);color:#fff;position:sticky;top:0;z-index:10;border-bottom:1px solid rgba(255,255,255,.08)}
.topbar{display:flex;gap:16px;align-items:center;justify-content:space-between;padding:16px 0}.brand{display:flex;flex-direction:column}.brand small{opacity:.8}.nav{display:flex;flex-wrap:wrap;gap:10px 16px;justify-content:flex-end}.nav a{color:#eaf2ff;font-size:14px}
.hero{padding:28px 0 18px}.hero-card,.section-card,.notice,.ad-box,.breadcrumbs{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 8px 24px rgba(9,30,66,.05)}
.hero-card{padding:28px}.eyebrow{display:inline-block;padding:6px 10px;background:#e8f1ff;color:var(--accent);border-radius:999px;font-size:13px;font-weight:700}.hero h1{margin:14px 0 8px;font-size:clamp(28px,4vw,42px);line-height:1.25}.hero p{margin:0 0 16px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 16px;border-radius:12px;background:var(--accent);color:#fff;font-weight:700}.btn.secondary{background:#eaf1fb;color:#16325c}.meta-strip{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.meta-strip span{background:#f4f7fc;border:1px solid var(--line);padding:8px 10px;border-radius:999px;font-size:13px;color:#394760}
.ad-box,.breadcrumbs,.notice{padding:18px;margin-top:14px}.ad-box{text-align:center}.ad-box img,.ad-box iframe{max-width:100%;margin-left:auto;margin-right:auto}.ad-label{margin:0 0 10px;font-size:13px;color:var(--muted);font-weight:700;text-align:center}.breadcrumbs{font-size:14px;color:var(--muted)}.breadcrumbs a{color:var(--muted)}.main-grid{display:grid;gap:18px;padding-bottom:24px}.section-card{padding:24px}.section-card h2{margin:0 0 14px;font-size:26px;line-height:1.35}.card-grid{display:grid;gap:16px}.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.card{padding:18px;border-radius:16px;border:1px solid var(--line);background:linear-gradient(180deg,#fff,#f8fbff)}.card h3{margin:0 0 8px;font-size:20px;line-height:1.4}.category-list{display:flex;flex-wrap:wrap;gap:10px}.pill{display:inline-block;padding:10px 14px;background:#edf4ff;border:1px solid #cfe0ff;border-radius:999px;color:#18468a;font-weight:700}.roadmap{padding-left:20px;margin:0}.roadmap li{margin:8px 0}.check-list{margin:0;padding-left:22px}.prompt-box{padding:18px;border:1px solid var(--line);border-radius:16px;background:#fbfdff;margin-bottom:16px}.prompt-box h3{margin-top:0}.prompt-box pre{white-space:pre-wrap;word-wrap:break-word;background:#0f1728;color:#eef6ff;padding:16px;border-radius:12px;overflow:auto}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;background:#fff}th,td{border:1px solid var(--line);padding:12px;text-align:left}th{background:#f4f8ff}.faq-list details{border:1px solid var(--line);border-radius:14px;padding:14px 16px;background:#fff}.faq-list details+details{margin-top:12px}.faq-list summary{cursor:pointer;font-weight:700}.site-map-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.site-map-grid>div{padding:16px;border:1px solid var(--line);border-radius:16px;background:#fbfdff}
.site-footer{background:#0e1728;color:#e8efff;margin-top:28px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px;padding:32px 0}.site-footer a{color:#d7e6ff}.footer-nav ul,.site-footer ul{margin:0;padding-left:18px}.rakuten-bottom{margin-top:20px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12)}.rakuten-cards{display:flex;flex-wrap:wrap;gap:12px}.small-note{font-size:13px;color:#c5d0e6}.article-lead{font-size:18px;color:#32405a}
@media (max-width:900px){.card-grid.two,.card-grid.three,.site-map-grid,.footer-grid{grid-template-columns:1fr}.topbar{flex-direction:column;align-items:flex-start}.nav{justify-content:flex-start}}