#back-to-top{align-items:center;background:#161616;border-radius:50%;bottom:32px;color:#f1bc63;cursor:pointer;display:flex;font-size:24px;font-weight:700;height:52px;justify-content:center;opacity:0;position:fixed;right:28px;transform:translateY(14px);transition:opacity .35s ease,transform .35s ease;visibility:hidden;width:52px;z-index:9999}#back-to-top.show{opacity:.95;transform:translateY(0);visibility:visible}#back-to-top:hover{opacity:1;transform:scale(1.12)}#site-header,#site-header *{box-sizing:border-box}#site-header{background:#383838;display:flex;justify-content:center;left:0;padding:18px 48px;position:fixed;right:0;top:0;transition:padding .35s ease,background-color .35s ease,box-shadow .35s ease,transform .35s ease;z-index:9999}.header-inner{align-items:center;color:#fff;display:flex;font-family:Noto Sans JP,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;gap:40px;justify-content:space-between;max-width:1100px;width:100%}.header-brand{color:#fff;font-size:20px;letter-spacing:.18em;text-transform:lowercase;white-space:nowrap}.header-nav{align-items:center;background:#161616;border-radius:999px;display:inline-flex;gap:6px;padding:4px 10px}.header-nav a{color:#cfcfcf;display:inline-block;font-size:13px;letter-spacing:.16em;padding:8px 14px;position:relative;text-decoration:none;text-transform:lowercase;transition:color .25s ease,opacity .25s ease}.header-nav a.is-active{color:#fff}.header-nav a:hover{color:#fff;opacity:.9}#site-header.header-mini{background:hsla(0,0%,9%,.96);box-shadow:0 10px 30px rgba(0,0,0,.35);padding:6px 32px;transform:translateY(-8px)}#site-header.header-mini .header-brand{font-size:16px}#site-header.header-mini .header-nav{padding:2px 8px}#site-header.header-mini .header-nav a{font-size:12px;padding:6px 10px}#site-header.header-mini.header-expanded{background:#383838;box-shadow:0 12px 32px rgba(0,0,0,.45);padding:14px 40px;transform:translateY(0)}#site-header.header-mini.header-expanded .header-brand{font-size:18px}#site-header.header-mini.header-expanded .header-nav a{font-size:12.5px;padding:7px 12px}@media (max-width: