:root{--bg:#f7f8fb;--card:#fff;--text:#1d2433;--muted:#667085;--accent:#5b5bd6;--accent-dark:#4545b8;--border:#e6e8ef}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;background:var(--bg);color:var(--text);line-height:1.75}a{color:var(--accent)}header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.94);border-bottom:1px solid var(--border);backdrop-filter:blur(10px)}.nav{max-width:1080px;margin:auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-weight:800;font-size:1.15rem;color:var(--text);text-decoration:none}.navlinks{display:flex;flex-wrap:wrap;gap:14px;font-size:.92rem}.navlinks a{color:var(--muted);text-decoration:none}.navlinks a:hover{color:var(--accent)}main{max-width:1080px;margin:auto;padding:48px 20px 72px}.hero{padding:70px 0 42px;text-align:center}.hero h1{margin:0 auto 18px;max-width:820px;font-size:clamp(2rem,6vw,4rem);line-height:1.15}.hero p{max-width:760px;margin:0 auto 26px;color:var(--muted);font-size:1.08rem}.btns{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}.btn{display:inline-block;padding:12px 20px;border-radius:10px;text-decoration:none;font-weight:700;border:1px solid var(--accent)}.btn.primary{background:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent-dark)}.btn.secondary{color:var(--accent);background:#fff}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:34px 0}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:24px;box-shadow:0 6px 24px rgba(34,40,70,.05)}.card h3{margin-top:0}.section{margin-top:56px}.section h2{font-size:1.8rem;margin-bottom:16px}.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--border);border-radius:14px}table{border-collapse:collapse;width:100%;min-width:680px}th,td{border-bottom:1px solid var(--border);padding:14px 16px;text-align:left}th{background:#f1f2f8}.badge{display:inline-block;border-radius:999px;padding:4px 10px;font-size:.8rem;background:#eeefff;color:var(--accent-dark);font-weight:700}.notice{border-left:4px solid var(--accent);background:#f0f1ff;padding:16px 18px;border-radius:8px}.page-title{margin:16px 0 28px;font-size:2.2rem}.prose{background:#fff;border:1px solid var(--border);border-radius:16px;padding:30px}.prose h2{margin-top:2em}.prose h2:first-child{margin-top:0}.prose ul{padding-left:1.3em}.placeholder{background:#fff7dd;border:1px solid #f0d98d;color:#725600;border-radius:8px;padding:3px 7px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}footer{border-top:1px solid var(--border);background:#fff}.footer-inner{max-width:1080px;margin:auto;padding:28px 20px;color:var(--muted);font-size:.9rem}.footer-links{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:10px}.footer-links a{color:var(--muted);text-decoration:none}@media(max-width:800px){.grid{grid-template-columns:1fr}.nav{align-items:flex-start;flex-direction:column}main{padding-top:28px}}