:root{--navy:#0d2948;--ink:#102b47;--blue:#1266a2;--cyan:#2ca0c6;--gold:#efa94c;--pale:#edf4f8;--muted:#65788a;--line:#d8e1e9;--shadow:0 25px 55px rgba(12,36,65,.18);--ease:cubic-bezier(.22,.63,.24,1)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,system-ui,sans-serif;color:var(--ink);background:#f8fafc;-webkit-font-smoothing:antialiased}
button{font:inherit;cursor:pointer}
button:disabled{opacity:.25;cursor:default}
a{color:inherit}
button:focus-visible,a:focus-visible{outline:3px solid #efa94c;outline-offset:4px}
[hidden]{display:none!important}
.skip-link{position:absolute;top:-60px;left:20px;background:#fff;padding:10px 20px;z-index:50}.skip-link:focus{top:10px}
.site-header{height:78px;background:#fff;border-bottom:1px solid #e7edf2}
.site-header__inner{height:100%;max-width:1260px;margin:0 auto;padding:0 34px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;flex-direction:column;gap:1px}.brand__logo{display:block;width:190px;height:auto;max-height:54px;object-fit:contain;object-position:left center}.brand__en{font-size:21px;line-height:1.1;font-weight:800;letter-spacing:.1em;color:var(--navy)}.brand__en span{font-size:14px;font-weight:500}.brand__jp{font-size:10px;letter-spacing:.25em;color:#5e7184}
.header-label{font-size:11px;color:#62809a;font-weight:700;letter-spacing:.16em}.header-label__year{color:#b0c0ce}
main{max-width:1260px;margin:0 auto;padding:0 34px}
.intro{padding:49px 0 35px;text-align:center}
.eyebrow{margin:0;color:#2583ae;font-weight:800;letter-spacing:.22em;font-size:10px}
.eyebrow__rule{display:inline-block;width:27px;height:1px;background:var(--gold);vertical-align:middle;margin:0 8px}
.intro h1{font-size:clamp(28px,3.5vw,43px);letter-spacing:.09em;margin:10px 0;font-weight:800;line-height:1.45}.intro__edition{display:block;font-size:13px;letter-spacing:.22em;color:#5e7b92;font-weight:600;margin-top:0}
.intro__message{font-size:clamp(14px,1.6vw,18px);font-weight:750;margin:19px 0 5px;letter-spacing:.045em}.intro__message span{color:#d58e2e}.intro__sub{color:#6d7f91;font-size:12px;margin:0}
.review-banner{background:#fff8ec;border:1px solid #e8c994;border-radius:9px;padding:12px 17px;display:flex;align-items:center;gap:13px;max-width:1020px;margin:0 auto 24px;box-shadow:0 5px 17px rgba(126,85,30,.07)}.review-banner__icon{width:24px;height:24px;flex:none;border-radius:50%;background:#ca8127;color:#fff;font-weight:900;display:grid;place-items:center}.review-banner p{font-size:12px;line-height:1.7;margin:0;color:#715326}
.viewer-section{max-width:1100px;margin:0 auto 60px}
.viewer-topline{display:flex;justify-content:space-between;align-items:end;margin:0 47px 21px;gap:20px}.viewer-topline h2{font-size:16px;letter-spacing:.04em;margin:0 0 5px}.viewer-help{font-size:11px;color:#7d8fa0;margin:0;line-height:1.7}.viewer-topline__note{font-size:10px;color:#a2b2c1;font-weight:800;letter-spacing:.13em;white-space:nowrap}
.viewer-shell{position:relative;display:flex;align-items:center;justify-content:center;gap:9px}
.book-stage{position:relative;width:min(100%,960px,calc((100svh - 275px) * 1.414));min-width:0;aspect-ratio:1.414/1;isolation:isolate;touch-action:pan-y;cursor:zoom-in;filter:drop-shadow(0 18px 23px rgba(8,41,69,.16))}
.desktop-canvas{position:absolute;inset:0;display:flex;perspective:1800px;transform-style:preserve-3d;border-radius:3px;}
.desktop-canvas{transition:transform .69s cubic-bezier(.28,.65,.31,1)}
.desktop-canvas.is-cover{transform:translateX(-25%)}
.desktop-canvas.is-back-cover{transform:translateX(25%)}
.page-slot{height:100%;width:50%;flex:0 0 50%;position:relative;overflow:hidden;background:linear-gradient(135deg,#eef3f7,#d5e0e8)}
.page-slot--left{box-shadow:inset -10px 0 22px rgba(7,34,61,.16)}.page-slot--right{box-shadow:inset 10px 0 22px rgba(7,34,61,.13)}
.page-slot.is-empty{background:transparent;box-shadow:none}
.page-slot img{display:block;width:100%;height:100%;object-fit:contain;user-select:none;-webkit-user-drag:none}
.page-slot.is-empty img{display:none}
.book-gutter{position:absolute;left:calc(50% - 7px);top:0;bottom:0;width:14px;z-index:1;pointer-events:none;background:linear-gradient(to right,transparent,rgba(9,29,53,.15) 46%,rgba(255,255,255,.16) 52%,transparent)}
.mobile-canvas{display:none}
.flip-sheet{position:absolute;top:0;width:50%;height:100%;z-index:4;transform-style:preserve-3d;pointer-events:none}
.flip-sheet.forward{left:50%;transform-origin:0% 50%}.flip-sheet.backward{left:0;transform-origin:100% 50%}
.flip-face{position:absolute;inset:0;overflow:hidden;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:#fff;box-shadow:0 0 18px rgba(10,31,51,.19)}
.flip-face.back{transform:rotateY(180deg)}.flip-face img{width:100%;height:100%;object-fit:contain;display:block}
.flip-sheet.forward .flip-face.front{box-shadow:10px 0 20px rgba(3,19,37,.18)}
.flip-sheet.backward .flip-face.front{box-shadow:-10px 0 20px rgba(3,19,37,.18)}
.book-hint{position:absolute;bottom:8px;right:12px;pointer-events:none;z-index:5;font-size:9px;letter-spacing:.12em;color:#6c8297;background:rgba(255,255,255,.89);padding:5px 8px;border-radius:3px;opacity:0;transition:opacity .18s}.book-hint span{font-size:13px}.book-stage:hover .book-hint{opacity:1}
.page-arrow{width:38px;height:62px;border:none;border-radius:7px;color:#1d6088;background:#fff;box-shadow:0 6px 17px rgba(14,42,66,.08);display:grid;place-items:center;flex:none;transition:background .2s,transform .2s;font-size:38px;line-height:1}.page-arrow:hover:not(:disabled){background:#e8f4fb;transform:translateY(-2px)}
.viewer-controls{max-width:960px;margin:21px auto 0;display:flex;justify-content:space-between;align-items:center;gap:16px}
.viewer-controls__page{display:flex;align-items:center;gap:13px;min-width:0}.page-label{font-size:13px;font-weight:800;letter-spacing:.1em;white-space:nowrap}.viewer-controls__separator{height:18px;width:1px;background:#cbd9e3}.chapter-label{font-size:11px;color:#6e8395;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;max-width:210px}
.viewer-controls__tools{display:flex;align-items:center;gap:7px;flex-wrap:wrap;justify-content:flex-end}
.tool-btn{border:1px solid #dce6ed;background:#fff;white-space:nowrap;border-radius:7px;color:#23455d;min-height:38px;padding:8px 12px;display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700;text-decoration:none;transition:background .2s,border-color .2s}.tool-btn:hover{background:#edf7fb;border-color:#afd9e8}.tool-btn__icon{font-size:16px;line-height:1}.tool-btn--primary{background:var(--navy);border-color:var(--navy);color:#fff}.tool-btn--primary:hover{background:#195b88;color:#fff}
.progress-track{height:3px;background:#e2e9ef;max-width:960px;margin:14px auto 0;overflow:hidden;border-radius:10px}.progress-track span{display:block;height:100%;width:5%;transition:width .3s;background:linear-gradient(90deg,#1074ac,#36aeb9)}
.viewer-footnote{text-align:center;font-size:10px;color:#8797a5;margin:15px 0 0}
.toc-panel{margin:25px auto 0;max-width:960px;background:#fff;border:1px solid #dbe5ed;border-radius:12px;padding:20px 24px 23px;box-shadow:0 15px 38px rgba(11,35,54,.1)}
.toc-panel__head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.toc-panel__head h3{font-size:15px;margin:0}.toc-close{border:0;background:transparent;font-size:25px;color:#567087;line-height:1}
.toc-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}
.toc-item{display:flex;flex-direction:column;gap:7px;padding:7px 7px 9px;background:#f8fbfd;border:1px solid #e1eaf0;border-radius:7px;text-align:left;min-width:0}.toc-item:hover,.toc-item.is-current{border-color:#1e9ac0;background:#e9f7fb}.toc-item img{width:100%;aspect-ratio:1406/1988;object-fit:cover;display:block;border-radius:3px;box-shadow:0 2px 5px #11334d22}.toc-item__label{font-size:10px;color:#314f69;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.toc-item__label strong{color:#187aab}
.overview{border-top:1px solid #dbe7ef;padding:50px 0 72px;display:grid;grid-template-columns:.85fr 1.6fr;gap:70px;max-width:1100px;margin:auto}
.overview__intro h2{font-size:clamp(22px,2.6vw,31px);letter-spacing:.07em;line-height:1.6;margin:13px 0 20px}.overview__intro>p:last-child{font-size:13px;line-height:2;color:#61778a;margin:0}.overview__services{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.overview__services article{background:#fff;border:1px solid #e6eef3;border-top:3px solid #1c80b4;padding:22px;min-width:0}.overview__services article:nth-child(2){border-top-color:#33ada9}.overview__services article:nth-child(3){border-top-color:#7760a4}.overview__services article:nth-child(4){border-top-color:#e4a24c}.overview__services article span{font-size:9px;letter-spacing:.11em;color:#6c8a9c;font-weight:800}.overview__services article h3{margin:11px 0;font-size:16px}.overview__services article p{font-size:11px;line-height:1.8;color:#768898;margin:0}
.site-footer{background:#0a2543;color:#bdd0df;padding:22px 34px;display:flex;justify-content:space-between;gap:20px;font-size:10px;letter-spacing:.1em}
.zoom-dialog{width:min(1150px,calc(100vw - 36px));height:min(96dvh,1200px);max-width:none;max-height:none;padding:0;border:0;border-radius:12px;background:#eef3f7;box-shadow:0 30px 90px #071c38a8;overflow:hidden;color:#193953}
.zoom-dialog::backdrop{background:rgba(3,17,32,.82)}
.zoom-dialog[open]{display:flex;flex-direction:column}
.zoom-dialog__top{height:58px;flex:none;background:#0d2948;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 16px 0 22px;font-size:12px;font-weight:750}
.zoom-dialog__actions{display:flex;gap:7px}.zoom-dialog__actions button{border:1px solid #527083;background:#183e60;color:#fff;height:34px;min-width:36px;border-radius:5px;font-size:18px}.zoom-dialog__actions #zoomResetBtn{font-size:10px;min-width:56px}.zoom-dialog__actions .zoom-dialog__close{background:#f0f4f7;color:#123753;border-color:#fff;font-size:23px}
.zoom-scroll{flex:1;min-height:0;overflow:auto;text-align:center;padding:20px;scrollbar-gutter:stable}.zoom-scroll img{display:block;height:auto;max-width:none;width:min(100%,660px);margin:0 auto;box-shadow:0 16px 30px #0e34532e;background:#fff}
.zoom-dialog__bottom{height:54px;background:#fff;display:flex;justify-content:space-between;align-items:center;padding:0 19px;gap:15px;font-size:11px;color:#637e92}.zoom-dialog__bottom button{background:none;color:#19577d;border:none;font-weight:700;padding:9px}
.noscript-message{padding:30px;text-align:center;background:#fffbe9}
@media(max-width:1000px){.viewer-topline{margin-left:47px;margin-right:47px}.overview{gap:35px}}
@media(max-width:760px){.site-header{height:66px}.site-header__inner{padding:0 17px}.brand__logo{width:159px}.brand__en{font-size:17px}.brand__en span{font-size:11px}.brand__jp{font-size:9px}.header-label{font-size:9px}.header-label__year{display:none}main{padding:0 15px}.intro{padding:30px 0 24px}.intro h1{margin:8px 0}.intro__message{margin-top:12px}.review-banner{align-items:flex-start;padding:10px;margin-bottom:18px}.review-banner p{font-size:11px}.viewer-topline{margin:0 0 12px}.viewer-topline__note{display:none}.viewer-help{font-size:10px}.viewer-section{margin-bottom:43px}.viewer-shell{gap:0}.book-stage{width:min(100%,420px,calc((100svh - 280px) * .707));aspect-ratio:1406/1988;min-width:0;filter:drop-shadow(0 14px 16px rgba(8,35,62,.17))}.desktop-canvas{display:none}.mobile-canvas{display:block;position:absolute;inset:0;perspective:1600px;transform-style:preserve-3d;background:#fff}.mobile-canvas>img{width:100%;height:100%;object-fit:contain;display:block}.page-arrow{position:absolute;z-index:6;top:50%;transform:translateY(-50%);background:rgba(13,41,72,.77);color:#fff;width:31px;height:54px;font-size:32px;border-radius:4px}.page-arrow--prev{left:-8px}.page-arrow--next{right:-8px}.page-arrow:hover:not(:disabled){background:#126da4;transform:translateY(-50%)}.flip-sheet{width:100%}.flip-sheet.forward,.flip-sheet.backward{left:0}.flip-sheet.forward{transform-origin:0 50%}.flip-sheet.backward{transform-origin:100% 50%}.book-hint{display:none}.viewer-controls{flex-direction:column;align-items:stretch;margin-top:16px;gap:15px}.viewer-controls__page{justify-content:center}.chapter-label{max-width:220px}.viewer-controls__tools{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:5px}.tool-btn{font-size:10px;display:flex;flex-direction:column;gap:3px;justify-content:center;min-height:54px;padding:5px 1px}.tool-btn__icon{font-size:17px}.progress-track{margin-top:13px}.viewer-footnote{font-size:10px}.toc-panel{padding:13px 10px}.toc-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.toc-item{padding:4px 4px 7px;gap:5px}.toc-item__label{font-size:9px}.overview{grid-template-columns:1fr;gap:25px;padding:36px 0 50px}.overview__services{gap:8px}.overview__services article{padding:13px}.overview__services article h3{font-size:13px}.overview__services article p{font-size:10px}.site-footer{padding:22px 15px;flex-direction:column;gap:5px}.zoom-dialog{width:100vw;height:100dvh;border-radius:0}.zoom-scroll{padding:11px}.zoom-dialog__top{height:53px;padding:0 12px}.zoom-dialog__bottom{padding:0 12px}}
@media(max-width:400px){.intro__message{font-size:13px}.header-label{font-size:8px}.viewer-controls__tools{gap:4px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}

/* Lean iframe mode: append ?embed=1 to the viewer URL. */
body.embed-mode .site-header,body.embed-mode .overview,body.embed-mode .site-footer{display:none}
body.embed-mode .intro{padding:23px 0 16px}
body.embed-mode .intro h1{font-size:24px;margin:8px 0 0}
body.embed-mode .intro__message,body.embed-mode .intro__sub{display:none}
body.embed-mode .viewer-section{margin-bottom:25px}
body.embed-mode .book-stage{width:min(100%,960px,calc((100svh - 205px) * 1.414))}
@media(max-width:760px){
body.embed-mode .intro{padding:14px 0 12px}
body.embed-mode .intro h1{font-size:21px}
body.embed-mode .viewer-topline{margin-bottom:9px}
body.embed-mode .viewer-help{display:none}
body.embed-mode .book-stage{width:min(100%,420px,calc((100svh - 210px) * .707))}
body.embed-mode .viewer-section{margin-bottom:10px}
}