:root{--blue:#0d4f8b;--blue2:#0a3761;--red:#d72b20;--paper:#fff;--bg:#eef3f7;--text:#17202a;--shadow:0 8px 24px rgba(15,45,70,.12)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:5rem}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;line-height:1.65}
img{display:block;max-width:100%;height:auto}
button,a{-webkit-tap-highlight-color:transparent}
.skip-link{position:fixed;left:1rem;top:-5rem;z-index:1000;background:#fff;color:#000;padding:.7rem 1rem;border-radius:.4rem}
.skip-link:focus{top:1rem}
.site-header{background:linear-gradient(135deg,var(--blue2),var(--blue));color:#fff;border-bottom:5px solid var(--red)}
.header-inner{width:min(100% - 2rem,1040px);margin:auto;padding:2rem 0 1.8rem}
.eyebrow{margin:0 0 .25rem;font-size:.82rem;letter-spacing:.08em;opacity:.85}
h1{margin:0;font-size:clamp(1.75rem,5vw,3rem);line-height:1.25}
.lead{margin:.65rem 0 0;font-size:.98rem}
.toc{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid #cfd9e2;backdrop-filter:blur(10px)}
.toc-inner{width:min(100% - 1rem,1040px);margin:auto}
.toc-toggle{display:none;width:100%;border:0;background:transparent;padding:.85rem .5rem;font:inherit;font-weight:700;color:var(--blue);justify-content:space-between}
.toc-list{display:flex;gap:.35rem;overflow-x:auto;list-style:none;margin:0;padding:.6rem 0;scrollbar-width:thin}
.toc-list a{display:block;white-space:nowrap;text-decoration:none;color:#18344c;background:#edf4f9;border:1px solid #d2e0ea;border-radius:999px;padding:.42rem .8rem;font-size:.86rem}
.toc-list a:hover,.toc-list a:focus-visible{background:var(--blue);color:#fff;outline:none}
.document{width:min(100% - 1rem,960px);margin:1.25rem auto 3rem}
.page-card{background:var(--paper);border-radius:14px;box-shadow:var(--shadow);margin:0 0 1.5rem;padding:clamp(.6rem,2vw,1.25rem);overflow:hidden}
.page-card h2{display:flex;align-items:center;gap:.65rem;margin:.15rem 0 .85rem;font-size:clamp(1.05rem,3vw,1.45rem);color:var(--blue2)}
.page-card h2 span{display:grid;place-items:center;flex:0 0 2rem;height:2rem;border-radius:50%;background:var(--blue);color:#fff;font-size:.9rem}
.image-button{display:block;width:100%;padding:0;border:0;background:#fff;cursor:zoom-in;border-radius:8px;overflow:hidden}
.image-button:focus-visible{outline:4px solid #ffbd4a;outline-offset:3px}
.image-button img{width:100%;border:1px solid #e0e5e9}
.back-top{display:block;width:max-content;margin:.9rem 0 .1rem auto;color:var(--blue);font-size:.9rem}
.site-footer{background:#15354f;color:#fff;text-align:center;padding:1.6rem 1rem}
.site-footer p{margin:0}
.viewer{width:min(96vw,1100px);height:min(94vh,1000px);padding:0;border:0;border-radius:12px;background:#101418;color:#fff;box-shadow:0 20px 70px rgba(0,0,0,.5)}
.viewer::backdrop{background:rgba(0,0,0,.78)}
.viewer-bar{height:3.25rem;display:flex;align-items:center;justify-content:space-between;padding:0 .7rem 0 1rem;background:#202830;position:sticky;top:0;z-index:2}
.viewer-bar strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.viewer-bar button{width:2.5rem;height:2.5rem;border:0;border-radius:50%;background:#fff;color:#111;font-size:1.7rem;line-height:1;cursor:pointer}
.viewer-scroll{height:calc(100% - 6.1rem);overflow:auto;overscroll-behavior:contain;text-align:center;background:#252b31;padding:.7rem}
.viewer-scroll img{width:auto;max-width:none;height:auto;min-width:min(900px,170vw);margin:auto;background:#fff;touch-action:pan-x pan-y pinch-zoom}
.viewer-help{height:2.85rem;margin:0;padding:.55rem .8rem;text-align:center;font-size:.78rem;background:#202830;color:#dce5ec}
.floating-top{position:fixed;right:max(1rem,env(safe-area-inset-right));bottom:max(1rem,env(safe-area-inset-bottom));z-index:40;width:3rem;height:3rem;border:0;border-radius:50%;background:var(--blue);color:#fff;font-size:1.35rem;box-shadow:0 5px 18px rgba(0,0,0,.28);opacity:0;pointer-events:none;transition:.2s}
.floating-top.show{opacity:1;pointer-events:auto}
@media(max-width:700px){
  .header-inner{padding:1.35rem 0 1.2rem}
  .toc-toggle{display:flex}
  .toc-list{display:none;max-height:55vh;overflow-y:auto;padding:.25rem 0 .75rem;flex-direction:column}
  .toc-list.open{display:flex}
  .toc-list a{white-space:normal;border-radius:.5rem;padding:.55rem .7rem}
  .document{margin-top:.75rem}
  .page-card{border-radius:9px;margin-bottom:1rem}
  .viewer{width:100vw;height:100dvh;max-width:none;max-height:none;border-radius:0}
  .viewer-scroll img{min-width:180vw}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.floating-top{transition:none}}
@media print{.site-header,.toc,.back-top,.site-footer,.floating-top{display:none!important}.document{width:100%;margin:0}.page-card{box-shadow:none;break-after:page;padding:0}.page-card h2{display:none}.image-button img{border:0}}