.book-cover,.book-toc-page{box-sizing:border-box}
.book-cover{
 min-height:92vh;display:grid;place-items:center;padding:60px 24px;
 background:
 radial-gradient(circle at 76% 24%,rgba(177,218,209,.34),transparent 27%),
 radial-gradient(circle at 20% 78%,rgba(239,210,171,.23),transparent 24%),
 linear-gradient(145deg,#fbfaf4,#f2f8f5);
 border-bottom:1px solid rgba(92,128,119,.10)
}
.cover-inner{width:min(880px,100%);position:relative;padding:64px 7%;border-radius:40px;background:rgba(255,255,252,.66);border:1px solid rgba(93,131,122,.12);box-shadow:0 30px 80px rgba(55,89,81,.08);overflow:hidden}
.cover-kicker{font-size:10px;letter-spacing:.28em;font-weight:800;color:#78a49b}
.book-cover h1{margin:18px 0 10px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:clamp(38px,6vw,72px);font-weight:500;line-height:1.25;letter-spacing:.025em;color:#244f49}
.book-cover h1 span{font-size:.72em;color:#355f58}
.cover-tagline{margin:0;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:16px;letter-spacing:.2em;color:#78928c}
.cover-enter{display:inline-flex;gap:10px;align-items:center;margin-top:42px;padding:11px 17px;border-radius:999px;text-decoration:none;background:#e7f3ef;color:#4f8178;border:1px solid #d5e8e2;font-size:12px;font-weight:800}
.cover-visual{position:absolute;right:7%;bottom:12%;width:220px;height:180px;opacity:.72}
.cv-triangle{position:absolute;left:5px;bottom:8px;width:0;height:0;border-left:52px solid transparent;border-right:52px solid transparent;border-bottom:88px solid rgba(240,190,173,.52);filter:drop-shadow(0 10px 10px rgba(80,100,95,.08))}
.cv-cube{position:absolute;right:15px;top:12px;width:78px;height:78px;border:2px solid #7ea99f;transform:rotate(-8deg);background:rgba(190,221,214,.25)}
.cv-cube:before,.cv-cube:after{content:"";position:absolute;border:2px solid #7ea99f;width:78px;height:78px}
.cv-cube:before{left:17px;top:-17px}.cv-cube:after{left:17px;top:-17px;clip-path:polygon(0 0,100% 0,100% 20%,20% 20%,20% 100%,0 100%)}

.book-toc-page{padding:80px max(24px,calc((100% - 1040px)/2));background:#fbfaf5}
.book-toc-head small{font-size:10px;letter-spacing:.25em;font-weight:800;color:#7da39b}
.book-toc-head h2{margin:6px 0 7px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:38px;font-weight:500;color:#294f49}
.book-toc-head p{color:#778782;font-size:12px}
.book-toc-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:28px}
.book-chapter-card{display:grid;grid-template-columns:120px 1fr;gap:20px;align-items:center;padding:25px;border-radius:26px;text-decoration:none!important;background:rgba(255,255,253,.9);border:1px solid #dfeae6;color:#415e58;box-shadow:0 12px 32px rgba(62,95,87,.045);transition:.2s}
.book-chapter-card:hover{transform:translateY(-3px);box-shadow:0 18px 40px rgba(62,95,87,.075)}
.book-chapter-card small{font-size:9px;letter-spacing:.18em;color:#7ca299;font-weight:800}
.book-chapter-card h3{margin:5px 0 7px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif;font-size:20px;font-weight:500;color:#31564f}
.book-chapter-card p{font-size:11px;line-height:1.7;color:#788984;margin:0 0 10px}
.book-chapter-card b{font-size:10px;color:#609087}
.book-chapter-icon{height:105px;border-radius:20px;background:linear-gradient(145deg,#eff8f5,#fffaf2);position:relative}
.triangle-icon:after{content:"";position:absolute;left:25px;top:24px;width:0;height:0;border-left:33px solid transparent;border-right:33px solid transparent;border-bottom:58px solid rgba(237,178,159,.66)}
.cube-icon span{position:absolute;width:34px;height:34px;background:rgba(154,207,196,.42);border:1px solid #7ba69c}
.cube-icon span:nth-child(1){left:26px;top:36px}.cube-icon span:nth-child(2){left:61px;top:36px}.cube-icon span:nth-child(3){left:61px;top:1px}
.toc-guide{margin-top:22px;padding:20px 23px;border-radius:22px;background:#f4f8f6;border:1px solid #e2ebe8;display:grid;grid-template-columns:32px 1fr;gap:9px 12px;font-size:11px;color:#71827d}
.toc-guide span{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:#fff;color:#6b9b92;font-size:9px;font-weight:800}
.toc-guide p{margin:4px 0}.toc-guide b{color:#547970}
.chapter-anchor{display:block;position:relative;top:-70px;visibility:hidden;height:0}
@media(max-width:720px){
 .book-cover{min-height:82vh;padding:28px 14px}.cover-inner{padding:44px 25px;border-radius:28px}.cover-visual{opacity:.32;right:-30px}
 .cover-tagline{font-size:12px}.book-toc-page{padding:55px 16px}.book-toc-grid{grid-template-columns:1fr}
 .book-chapter-card{grid-template-columns:82px 1fr;padding:18px;gap:14px}.book-chapter-icon{height:82px}
 .triangle-icon:after{left:14px;top:18px;border-left-width:25px;border-right-width:25px;border-bottom-width:45px}
 .cube-icon span{width:27px;height:27px}.cube-icon span:nth-child(1){left:14px;top:31px}.cube-icon span:nth-child(2){left:42px;top:31px}.cube-icon span:nth-child(3){left:42px;top:3px}
}