:root{--paper:#fbfaf6;--surface:#fff;--ink:#252528;--muted:#65676d;--line:#d9d5cc;--wine:#8f1738;--blue:#176b87;--font:Inter,"Noto Sans","Noto Sans JP",system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font:1rem/1.65 var(--font)}a{color:var(--blue);text-underline-offset:.18em}header{padding:.8rem clamp(1rem,5vw,4rem);border-bottom:1px solid var(--line)}header a{text-decoration:none;font-weight:750}main{width:min(100% - 2rem,70rem);min-height:78vh;margin:auto;padding:5rem 0}.eyebrow{margin:0;color:var(--wine);font-size:.78rem;font-weight:800;letter-spacing:.11em;text-transform:uppercase}h1{margin:.25rem 0;font-size:clamp(2.6rem,7vw,5.4rem);line-height:1;letter-spacing:-.045em}.lead{max-width:63ch;color:var(--muted);font-size:1.18rem}section{margin-top:4rem}h2{font-size:1.2rem}.chapter-card{display:block;max-width:48rem;margin-top:1rem;padding:1.3rem;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-left:.35rem solid var(--wine);border-radius:.55rem;text-decoration:none;box-shadow:0 .5rem 1.4rem rgb(30 30 35 / 6%)}.chapter-card:hover{transform:translateY(-2px)}.chapter-card span{color:var(--wine);font-size:.78rem;font-weight:800;text-transform:uppercase}.chapter-card h3{margin:.25rem 0;font-size:1.5rem}.chapter-card p{margin:.3rem 0;color:var(--muted)}footer{padding:2rem;text-align:center;color:var(--muted);border-top:1px solid var(--line);font-size:.82rem}@media(prefers-reduced-motion:reduce){.chapter-card:hover{transform:none}}