:root{--ink:#10253f;--blue:#155a9c;--pale:#edf6fc;--line:#c9dceb;--muted:#52677e}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:#fff;color:var(--ink);font-family:"Noto Sans JP","Yu Gothic",sans-serif;font-size:16px;line-height:1.85}a{color:var(--blue);text-underline-offset:.22em;overflow-wrap:anywhere}a:focus-visible{outline:3px solid #b86b14;outline-offset:5px}header,main,footer{width:min(1080px,calc(100% - 40px));margin-inline:auto}header{display:flex;justify-content:space-between;gap:24px;align-items:center;padding:22px 0;border-bottom:1px solid var(--line)}nav{display:flex;flex-wrap:wrap;gap:10px 24px}.brand{font-weight:800;letter-spacing:.1em;text-decoration:none;color:var(--ink)}header nav{font-size:.9rem}.draft{text-align:center;background:#fff4dc;padding:8px 16px;font-size:.85rem}.skip{position:absolute;left:12px;top:-100px;background:white;padding:12px;z-index:2}.skip:focus{top:12px}.breadcrumb{font-size:.8rem;color:var(--muted);padding-top:24px;gap:8px}.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:70px;align-items:center;padding:64px 0 80px;border:0}.eyebrow,.number{font-size:.8rem;letter-spacing:.12em;font-weight:700;color:var(--blue)}h1{font-size:clamp(3rem,7vw,5rem);line-height:1.25;letter-spacing:.06em;margin:24px 0}h1 span,h1 small{display:block;letter-spacing:.03em;font-size:1.1rem;margin:14px 0;font-weight:600}.tagline{font-size:clamp(1.5rem,3vw,2rem);font-weight:700;line-height:1.6}.lead{max-width:36em}p{margin:0 0 18px}.button{display:inline-flex;justify-content:center;align-items:center;min-height:48px;padding:12px 20px;border-radius:5px;background:var(--blue);color:white;text-decoration:none;font-weight:700;font-size:.95rem}.learning-note{border-top:4px solid var(--blue);padding:30px;background:var(--pale)}.learning-note ol{list-style:none;counter-reset:step;padding:0;margin:24px 0}.learning-note li{counter-increment:step;position:relative;padding:0 0 22px 44px}.learning-note li:before{content:"0" counter(step);position:absolute;left:0;color:var(--blue);font-size:1.15rem;font-weight:700}.learning-note strong,.learning-note span{display:block}.learning-note span{font-size:.9rem}.learning-note>p:last-child{font-size:.85rem;margin:0}section{padding:56px 0;border-top:1px solid var(--line)}h2{font-size:clamp(1.6rem,3.5vw,2.3rem);line-height:1.5;margin:0 0 24px}h3{font-size:1.3rem;margin:0 0 16px}.volumes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;margin-top:32px}.volume{display:flex;flex-direction:column;padding:28px 24px;border:1px solid var(--line);border-top:5px solid var(--blue)}.volume h3{font-size:2rem;line-height:1.3}.volume.animals{border-top-color:#b86b14}.volume.plants{border-top-color:#34806c}.subtitle{font-weight:700}.volume ul{padding-left:1.2em;font-size:.9rem}.volume li{margin-bottom:8px}.spec,.note,.source{font-size:.85rem;color:var(--muted)}.spec{border-top:1px solid var(--line);padding-top:16px}.buy{display:flex;flex-direction:column;gap:14px;margin-top:auto}.buy>a:not(.button){text-align:center;font-size:.9rem}.source{margin:24px 0 0}.format-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}.format-grid article{background:var(--pale);padding:28px}.sample-links{display:flex;flex-wrap:wrap;gap:16px 28px;margin:24px 0}.sample-links a{padding:10px 0;font-weight:700}.author{display:grid;grid-template-columns:180px 1fr;gap:40px;align-items:center}.author img{width:100%;height:auto;border-radius:10px}.author h2{margin-bottom:16px}.coming{background:#f7f9fb;padding:30px;margin:25px 0}.coming h2{font-size:1.35rem}.coming p{margin:0}footer{border-top:1px solid var(--line);padding:28px 0 40px;font-size:.85rem;color:var(--muted)}footer>a{margin-left:24px}footer p{margin-top:12px}@media(max-width:850px){.hero{gap:28px}.volumes{grid-template-columns:1fr}.volume{padding:28px}.buy{align-items:flex-start}.volume .buy a{width:100%}.learning-note{padding:22px}}@media(max-width:600px){header,main,footer{width:calc(100% - 32px)}header{align-items:flex-start;flex-direction:column;gap:12px}header nav{gap:10px 18px}.hero{grid-template-columns:1fr;padding:40px 0}.format-grid{grid-template-columns:1fr;gap:20px}.author{grid-template-columns:1fr;gap:24px}.author img{max-width:160px}section{padding:40px 0}.sample-links{flex-direction:column;gap:4px}.button{max-width:100%}.coming{padding:24px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Book selection and sample navigation, 2026-11-10. */
.volume.human{border-top-color:#8b4b79}.fit{padding:14px 16px;background:#f7f9fb;font-size:.9rem}.fit strong{display:block;margin-bottom:6px}.sample-checks{padding-left:1.5em}.sample-checks li{margin-bottom:12px}.sample-list{list-style:none;padding:0;margin:28px 0}.sample-list li{display:flex;align-items:baseline;flex-wrap:wrap;gap:8px 24px;padding:16px 0;border-bottom:1px solid var(--line)}.sample-list strong{min-width:5em}.sample-list a{padding:6px 0}#choose .note{margin-top:20px}@media(max-width:600px){.sample-list li{align-items:flex-start;flex-direction:column;gap:2px}.volume{padding:24px 20px}}