:root{--bg:#f4f2fc;--fg:#1d1840;--mut:#5d5a7d;--bd:#d9d4f0;--ac:#5b2fe0;--sp:#e89a00}
@media(prefers-color-scheme:dark){:root{--bg:#120f2a;--fg:#ece9ff;--mut:#a9a5cf;--bd:#322c63;--ac:#a58bff;--sp:#ffbe3d}}
*{box-sizing:border-box}
body{margin:0;font:1rem/1.7 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--fg)}
a{color:var(--ac)}a:focus-visible{outline:3px solid var(--sp);outline-offset:2px}
.w{max-width:880px;margin:0 auto;padding:0 20px}
header{border-bottom:2px solid var(--fg)}
header .w{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap;padding-top:16px;padding-bottom:12px}
.logo{font:700 1.5rem Georgia,serif;color:var(--fg);text-decoration:none}.logo i{color:var(--sp);font-style:normal;margin-left:4px}
nav a{margin-left:18px;color:var(--fg);text-decoration:none}nav a:hover{text-decoration:underline}
h1,h2{font-family:Georgia,"Times New Roman",serif;line-height:1.2}
.hero{padding:64px 0 40px}.hero h1{font-size:clamp(2.4rem,8vw,4.4rem);margin:0 0 16px;max-width:11em}
.hero p{font-size:1.15rem;color:var(--mut);max-width:34em;margin:0}
.book{list-style:none;margin:0 0 40px;padding:0;border-top:1px solid var(--bd)}
.book li{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:14px 0;border-bottom:1px solid var(--bd)}
.book b{font:700 1.15rem Georgia,serif}.book small{display:block;color:var(--mut);font-size:.95rem}
.tag{white-space:nowrap;font-size:.85rem;border:1px solid var(--sp);border-radius:99px;padding:1px 10px}
.why{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;margin-bottom:56px}
.why div{border-top:3px solid var(--ac);padding-top:10px}.why h2{font-size:1.2rem;margin:0 0 4px}.why p{margin:0;color:var(--mut)}
main.n{max-width:720px;margin:0 auto;padding:40px 20px 56px}main.n h1{font-size:2.2rem;margin-top:0}main.n h2{font-size:1.3rem;margin-top:1.8em}
.btn{display:inline-block;background:var(--ac);color:var(--bg);padding:10px 18px;border-radius:8px;text-decoration:none;font-weight:600}
footer{border-top:2px solid var(--fg);padding:20px 0 32px;font-size:.92rem;color:var(--mut)}
footer a{color:var(--mut);margin-right:14px;display:inline-block}