:root{--bg:#f6f7fb;--panel:#fff;--ink:#20242b;--muted:#68707d;--accent:#2f5bea;--line:#dfe3eb;--soft:#eef3ff;--max:1180px}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;background:var(--bg);color:var(--ink);line-height:1.75}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.topbar{background:#18213a;color:#fff}.topbar-inner{max-width:var(--max);margin:auto;padding:18px 22px;display:flex;gap:24px;align-items:center}.brand{font-size:24px;font-weight:800;letter-spacing:.3px}.brand a{color:#fff;text-decoration:none}.tagline{color:#bac4da;font-size:13px}.search{margin-left:auto;display:flex;gap:8px}.search input{width:280px;max-width:42vw;padding:9px 12px;border-radius:8px;border:1px solid #44506c;background:#fff}.search button{padding:9px 14px;border:0;border-radius:8px;background:#4f78ff;color:#fff;font-weight:700}.nav{background:#fff;border-bottom:1px solid var(--line)}.nav-inner{max-width:var(--max);margin:auto;padding:10px 22px;display:flex;gap:18px;flex-wrap:wrap}.layout{max-width:var(--max);margin:26px auto;display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:24px;padding:0 22px}.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:0 3px 18px rgba(20,30,50,.04)}h1{font-size:34px;line-height:1.25;margin:0 0 10px}h2{font-size:24px;margin-top:34px;border-bottom:1px solid var(--line);padding-bottom:6px}h3{font-size:19px;margin-top:26px}.lead{font-size:18px}.meta{color:var(--muted);font-size:13px;margin-bottom:20px}.formula{font-family:"Times New Roman",serif;background:#f8f9fc;border-left:4px solid #6c8cff;padding:12px 16px;margin:16px 0;font-size:20px;overflow:auto}.toc{background:#fbfcff;border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin:20px 0}.toc strong{display:block;margin-bottom:8px}.toc ul{margin:0;padding-left:22px}.related{display:flex;flex-wrap:wrap;gap:8px}.related a{background:var(--soft);border-radius:999px;padding:6px 10px}.sidebar h3{margin-top:0}.side-list{list-style:none;padding:0;margin:0}.side-list li{border-bottom:1px solid var(--line);padding:8px 0}.crumb{font-size:13px;color:var(--muted);margin-bottom:12px}.hero{background:linear-gradient(135deg,#1e2d54,#315fdc);color:#fff;border-radius:16px;padding:38px}.hero p{color:#e5ebff}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:20px}.tile{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.tile h3{margin:0 0 6px}.notice{background:#fff8db;border:1px solid #eadc96;padding:12px 14px;border-radius:10px}.footer{max-width:var(--max);margin:30px auto;padding:20px 22px 40px;color:var(--muted);font-size:13px}.table{width:100%;border-collapse:collapse}.table th,.table td{border:1px solid var(--line);padding:9px 10px;text-align:left}.table th{background:#f7f8fb}@media(max-width:820px){.layout{grid-template-columns:1fr}.search{display:none}.grid{grid-template-columns:1fr}h1{font-size:29px}}

.ad-slot{width:160px;min-height:600px;margin:18px auto 0;overflow:hidden;text-align:center}

.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.hero-button{display:inline-block;background:#fff;color:#234fbf;padding:10px 15px;border-radius:9px;font-weight:700}.hero-button:hover{text-decoration:none;filter:brightness(.97)}