*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:16px}body{margin:0;color:#18211f;background:#f5f7f6;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic",Meiryo,sans-serif}.hero{background:#fff;border-bottom:4px solid #d7352a}.hero-inner{max-width:1050px;margin:auto;padding:30px 20px 24px}.eyebrow{margin:0 0 8px;color:#1261a0;font-weight:700;letter-spacing:.04em}.hero h1{margin:0;font-size:clamp(28px,5vw,48px);line-height:1.2}.lead{margin:12px 0 0;font-size:clamp(16px,2.5vw,21px);color:#58625f}.sp{display:none}.toc{max-width:1050px;margin:22px auto;padding:0 18px}.toc details{background:#fff;border:1px solid #d9dfdc;border-radius:16px;box-shadow:0 4px 18px #0000000d;overflow:hidden}.toc summary{cursor:pointer;font-size:20px;font-weight:800;padding:17px 20px;background:#f9fbfa}.toc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding:15px}.toc-grid a{text-decoration:none;color:inherit;border:1px solid #dfe5e2;border-radius:12px;padding:15px;display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center}.toc-grid a:hover{background:#f3f8fb;border-color:#aac9df}.toc-grid span{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:#1261a0;color:#fff;font-weight:800}.toc-grid small{color:#69736f}main{max-width:1050px;margin:auto;padding:0 18px 50px}.cover-section{margin:20px auto 36px;max-width:760px}.chapter{padding:26px 0 40px;border-top:1px solid #d6ddda}.chapter-title{display:flex;gap:14px;align-items:center;margin-bottom:18px}.chapter-title>span{display:grid;place-items:center;min-width:48px;height:48px;border-radius:50%;background:#d7352a;color:#fff;font-size:20px;font-weight:800}.chapter-title h2{margin:0;font-size:clamp(25px,4vw,34px)}.chapter-title p{margin:4px 0 0;color:#69736f}.pages{display:grid;grid-template-columns:1fr;gap:24px;align-items:start;max-width:900px;margin:0 auto}.page-card{margin:0;background:#fff;border:1px solid #d8dedb;border-radius:12px;overflow:hidden;box-shadow:0 5px 22px #0000000c}.page-card figcaption{padding:8px 12px;font-weight:700;color:#1261a0;border-bottom:1px solid #e4e8e6}.zoom{display:block;width:100%;padding:0;border:0;background:#fff;cursor:zoom-in}.zoom img{display:block;width:100%;height:auto}.back{display:inline-block;margin-top:18px;color:#1261a0;font-weight:700;text-decoration:none}footer{text-align:center;padding:25px 15px 45px;color:#65706c}dialog{width:min(96vw,1400px);height:min(94vh,1000px);padding:0;border:0;border-radius:14px;background:#151918;color:#fff;box-shadow:0 18px 70px #0008}dialog::backdrop{background:#000b}.close{position:absolute;right:10px;top:8px;z-index:3;width:44px;height:44px;border:0;border-radius:50%;background:#fff;color:#111;font-size:30px;line-height:1;cursor:pointer}.viewer-scroll{height:calc(100% - 38px);overflow:auto;padding:58px 20px 20px;text-align:center}.viewer-scroll img{max-width:none;width:auto;min-width:min(100%,1000px);height:auto}.viewer-scroll+p{text-align:center;margin:6px 10px 12px;font-size:13px;color:#ccd3d0}@media(max-width:700px){.sp{display:block}.hero-inner{padding:23px 17px 19px}.toc{margin:14px auto;padding:0 10px}.toc summary{padding:14px 15px}.toc-grid{grid-template-columns:1fr;padding:10px}.toc-grid a{padding:12px}.pages{grid-template-columns:1fr;gap:16px}main{padding:0 10px 35px}.chapter{padding:23px 0 30px}.chapter-title{padding:0 5px}.chapter-title p{font-size:13px}.cover-section{margin-top:12px}.page-card{border-radius:8px}.viewer-scroll{padding:58px 8px 12px}.viewer-scroll img{min-width:1150px}dialog{width:100vw;height:100dvh;max-width:none;max-height:none;border-radius:0}}