:root{--bk-main:#5f3dc4;--bk-sub:#7048e8;--bk-accent:#e8590c;--bk-cream:#faf7f2;--bk-ink:#282338;--bk-muted:#6b6478;--bk-border:#e4dfd7;--bk-card:#fff}
body.books-site{font-family:"Noto Sans JP",system-ui,sans-serif;background:var(--bk-cream);color:var(--bk-ink);line-height:1.7;margin:0}
.books-site *{box-sizing:border-box}
.books-site a{color:var(--bk-main);text-decoration:none}
.bk-cross{background:#261f37;color:#fff;text-align:center;padding:7px 14px;font-size:.75rem}.bk-cross a{color:#fff;text-decoration:underline}
.bk-header{background:#fff;border-bottom:1px solid var(--bk-border);position:sticky;top:0;z-index:50;box-shadow:0 5px 18px rgba(38,31,55,.06)}
.bk-header-inner{max-width:1220px;margin:auto;padding:13px 20px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.bk-logo{display:flex;align-items:center;gap:8px;color:var(--bk-ink);font-family:"Noto Serif JP",serif;font-size:1.35rem;font-weight:800}.bk-logo small{display:block;font-family:"Noto Sans JP",sans-serif;font-size:.65rem;font-weight:600;color:var(--bk-muted)}
.bk-search{flex:1;min-width:240px;display:flex}.bk-search input{flex:1;min-width:0;border:1px solid var(--bk-border);border-radius:10px 0 0 10px;padding:10px 13px;font:inherit}.bk-search button{border:0;border-radius:0 10px 10px 0;background:var(--bk-main);color:#fff;padding:0 18px;font-weight:800}
.bk-nav{max-width:1220px;margin:auto;padding:0 20px 12px;display:flex;gap:6px;overflow:auto}.bk-nav a{flex:0 0 auto;color:#4e4860;background:#f5f2fc;border-radius:999px;padding:6px 11px;font-size:.76rem}
.bk-container{max-width:1220px;margin:auto;padding:26px 20px}.bk-breadcrumb{font-size:.76rem;color:var(--bk-muted);margin-bottom:18px}
.bk-hero{background:radial-gradient(circle at 82% 20%,rgba(255,255,255,.2),transparent 25%),linear-gradient(125deg,#3f278f,#7657db);color:#fff;border-radius:22px;padding:45px 36px;margin-bottom:24px;position:relative;overflow:hidden}.bk-hero h1{font-family:"Noto Serif JP",serif;font-size:clamp(1.8rem,4vw,3rem);line-height:1.2;margin:0 0 12px}.bk-hero p{max-width:700px;color:rgba(255,255,255,.86);margin:0}.bk-hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.bk-hero-actions a{background:#fff;color:var(--bk-main);padding:10px 16px;border-radius:9px;font-weight:800;font-size:.82rem}
.bk-genre-chips{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.bk-genre-chips a{background:#fff;border:1px solid var(--bk-border);border-radius:999px;padding:7px 14px;color:var(--bk-ink);font-size:.8rem}.bk-genre-chips a.active,.bk-genre-chips a:hover{background:var(--bk-main);border-color:var(--bk-main);color:#fff}
.bk-section-title{font-family:"Noto Serif JP",serif;font-size:1.4rem;border-left:5px solid var(--bk-main);padding-left:12px;margin:36px 0 17px}
.bk-section-head{display:flex;align-items:end;justify-content:space-between;gap:14px}.bk-section-head .bk-section-title{margin-bottom:9px}.bk-section-lead{font-size:.82rem;color:var(--bk-muted);margin:0 0 17px}
.bk-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(176px,1fr));gap:17px}.bk-card{background:#fff;border:1px solid var(--bk-border);border-radius:14px;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 5px 18px rgba(38,31,55,.05);transition:.18s}.bk-card:hover{transform:translateY(-3px);box-shadow:0 13px 30px rgba(38,31,55,.12)}
.bk-card-img{aspect-ratio:3/4;background:#f0ece5;display:grid;place-items:center;overflow:hidden}.bk-card-img img{width:100%;height:100%;object-fit:contain}.bk-card-body{display:flex;flex-direction:column;flex:1;padding:12px}.bk-card-type{font-size:.65rem;font-weight:800;color:var(--bk-main)}.bk-card-title{font-size:.83rem;line-height:1.5;margin:5px 0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.bk-card-title a{color:var(--bk-ink)}.bk-card-author{font-size:.7rem;color:var(--bk-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bk-card-rating{font-size:.7rem;color:var(--bk-accent);margin-top:5px}.bk-card-price{font-family:"Noto Serif JP",serif;font-size:1.05rem;font-weight:800;color:var(--bk-accent);margin-top:auto;padding-top:7px}.bk-card-detail{font-size:.7rem;font-weight:800;margin:5px 0}.bk-card-btn{display:block;text-align:center;background:var(--bk-main);color:#fff!important;border-radius:8px;padding:8px 7px;font-size:.73rem;font-weight:800;margin-top:5px}.bk-card-btn.is-disabled{background:#8d92a0}
.bk-disclosure{background:#fff;border:1px solid var(--bk-border);border-left:4px solid var(--bk-main);border-radius:10px;padding:12px 14px;color:var(--bk-muted);font-size:.76rem;margin:18px 0}
.bk-filter{display:flex;justify-content:space-between;align-items:center;gap:12px;background:#fff;border:1px solid var(--bk-border);border-radius:12px;padding:12px 14px;margin:16px 0}.bk-filter select{border:1px solid var(--bk-border);border-radius:7px;padding:7px}
.bk-pager{display:flex;justify-content:center;gap:6px;margin-top:30px;flex-wrap:wrap}.bk-pager a,.bk-pager span{background:#fff;border:1px solid var(--bk-border);border-radius:7px;padding:7px 11px}.bk-pager .current{background:var(--bk-main);color:#fff}
.bk-detail{display:grid;grid-template-columns:minmax(250px,320px) 1fr;gap:34px;background:#fff;border:1px solid var(--bk-border);border-radius:18px;padding:28px}.bk-detail-cover{aspect-ratio:3/4;background:#f1ede6;border-radius:10px;display:grid;place-items:center;overflow:hidden}.bk-detail-cover img{width:100%;height:100%;object-fit:contain}.bk-detail h1{font-family:"Noto Serif JP",serif;line-height:1.4;font-size:1.6rem;margin:7px 0 10px}.bk-detail-price{font-family:"Noto Serif JP",serif;font-size:1.8rem;color:var(--bk-accent);font-weight:800}.bk-detail-table{border-collapse:collapse;font-size:.84rem;margin:14px 0}.bk-detail-table td{padding:5px 14px 5px 0;vertical-align:top}.bk-detail-table td:first-child{color:var(--bk-muted)}.bk-detail-cta{display:inline-flex;flex-direction:column;text-align:center;background:var(--bk-main);color:#fff!important;border-radius:10px;padding:13px 28px;font-weight:800;margin-top:12px}.bk-detail-cta small{font-size:.68rem;opacity:.85;margin-top:3px}.bk-copy{background:#fff;border:1px solid var(--bk-border);border-radius:15px;padding:23px;margin-top:22px}.bk-copy h2{font-family:"Noto Serif JP",serif;font-size:1.15rem}
.bk-footer{background:#261f37;color:rgba(255,255,255,.7);padding:34px 20px;margin-top:50px;font-size:.78rem}.bk-footer-inner{max-width:1220px;margin:auto}.bk-footer-links{display:flex;gap:14px;flex-wrap:wrap;margin-top:10px}.bk-footer a{color:#fff}
.bk-empty{text-align:center;padding:55px 20px;color:var(--bk-muted)}
@media(max-width:760px){.bk-container{padding:20px 13px}.bk-hero{padding:32px 22px}.bk-detail{grid-template-columns:1fr;padding:18px}.bk-detail-cover{max-width:280px;margin:auto}.bk-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.bk-header-inner{padding:11px 13px}.bk-nav{padding:0 13px 10px}}