/* Bottom sheet menu adapted from the user-provided visual reference. */
.mobile-menu{--sheet-ink:#29474b;--sheet-muted:#526a6e;--sheet-line:#cce3e6;--sheet-accent:#176471;--sheet-cream:#f1fafb;position:fixed;top:auto;bottom:0;left:0;right:0;margin:0 auto;padding:0;width:min(100%,620px);max-width:100%;max-height:90dvh;overflow-y:auto;overscroll-behavior:contain;border:0;border-radius:26px 26px 0 0;background:#fff;color:var(--sheet-ink);box-shadow:0 -24px 50px -24px #143e4f70;z-index:1000;font-size:16px;line-height:1.6}.mobile-menu[open]{animation:sheet-up .45s cubic-bezier(.22,1,.36,1)}.mobile-menu::backdrop{background:#153a426b;backdrop-filter:blur(2px)}.sheet-grab{display:block;width:64px;height:27px;margin:0 auto;padding:0;border:0;background:transparent;cursor:pointer}.sheet-grab::after{content:"";display:block;width:44px;height:5px;background:#a4c3c8;border-radius:3px;margin:auto}.sheet-head{display:flex;align-items:center;justify-content:space-between;padding:0 22px 12px;border-bottom:1px solid var(--sheet-line);gap:16px}.sheet-head h2{margin:0;font-family:'Yu Mincho',serif;font-size:23px;line-height:1.5}.sheet-close{height:44px;padding:8px 13px;background:#fff;border:1px solid #8daeb4;border-radius:999px;color:var(--sheet-accent);font:inherit;font-size:14px;cursor:pointer}.mobile-menu nav{display:block;background:white;padding:0}.mobile-menu .sheet-tiles{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:16px 18px 6px}.mobile-menu a.sheet-tile{display:flex;flex-direction:column;gap:5px;border:1px solid var(--sheet-line);border-radius:14px;padding:13px;text-decoration:none;color:var(--sheet-ink);background:var(--sheet-cream);min-width:0}.mobile-menu .sheet-tile:hover,.mobile-menu .sheet-tile:active{background:#d9f0f3}.sheet-tile .tile-en{font-family:Georgia,serif;font-size:11px;letter-spacing:.1em;color:var(--sheet-accent)}.sheet-tile b{font-size:16px;line-height:1.5;word-break:normal}.sheet-tile small{font-size:13px;line-height:1.6;color:var(--sheet-muted)}.mobile-menu .sheet-rows{padding:6px 18px 8px}.mobile-menu .sheet-rows a{display:flex;justify-content:space-between;align-items:center;padding:13px 6px;font-size:15px;font-weight:600;color:var(--sheet-ink);text-decoration:none;border:0;border-bottom:1px dashed var(--sheet-line);background:white;min-height:48px}.sheet-rows a span{color:var(--sheet-accent)}.mobile-menu .sheet-foot{padding:12px 18px max(22px,env(safe-area-inset-bottom))}.mobile-menu .sheet-foot a{display:flex;align-items:center;justify-content:center;min-height:52px;gap:10px;background:var(--sheet-accent);color:#fff;border:0;border-radius:13px;padding:14px;text-decoration:none;font-size:16px;font-weight:700}.sheet-home{display:block;text-align:center;color:var(--sheet-accent);font-size:14px;padding:14px;text-decoration:underline}.mobile-menu a:focus-visible,.mobile-menu button:focus-visible{outline:3px solid #826416;outline-offset:2px}@keyframes sheet-up{from{transform:translateY(100%)}to{transform:translateY(0)}}@media(min-width:1181px){.mobile-menu{display:none}}@media(max-height:600px){.mobile-menu{max-height:96dvh}.mobile-menu .sheet-tiles{gap:7px;padding-top:10px}.mobile-menu .sheet-tile{padding:9px}.sheet-tile small{display:none}.mobile-menu .sheet-rows a{padding:9px 6px}}@media(prefers-reduced-motion:reduce){.mobile-menu[open]{animation:none}html{scroll-behavior:auto}}

@media(max-width:1180px){body>header{position:sticky;top:0;z-index:50;background:#fff;box-shadow:0 1px 0 #d5e7e9}}