/* Header and main menu, copied from the main page (source/index.html) so every page looks the same. Change both together. */
body{font-family:"IBM Plex Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic UI","Meiryo",system-ui,sans-serif}
.topbar .wrap,.mainnav .wrap{max-width:1240px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.topbar{background:var(--surface);border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding-block:14px}
.topbar .brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.topbar .brand small{font-weight:500;color:var(--muted);font-size:12px;letter-spacing:.02em}
.lens{width:26px;height:26px;border-radius:50%;border:3px solid var(--accent);position:relative;flex:none}
.lens::after{content:"";position:absolute;width:9px;height:3px;background:var(--accent);right:-8px;bottom:-3px;transform:rotate(45deg);border-radius:2px}
.toplinks{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
.toplinks a{padding:7px 12px;border-radius:999px;font-weight:600;font-size:13.5px;color:var(--ink);text-decoration:none;white-space:nowrap}
.toplinks a:hover{background:var(--line)}
.my-link{margin-left:12px;display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border:1px solid var(--line);border-radius:999px;font-weight:700;font-size:13px;color:var(--accent);text-decoration:none;background:var(--surface);white-space:nowrap}
.my-link:hover{border-color:var(--accent)}
.fl-auth{display:inline-flex;align-items:center;gap:6px;margin-left:12px;min-height:36px}
.fl-auth .my-link{margin-left:0}
.fl-auth .fl-signup{background:var(--accent);color:#fff;border-color:var(--accent)}
.fl-acct{position:relative;margin-left:6px}
.fl-acct summary{list-style:none;cursor:pointer;padding:7px 12px;border:1px solid var(--line);border-radius:999px;font-size:13px;color:var(--muted);white-space:nowrap;max-width:220px;overflow:hidden;text-overflow:ellipsis}
.fl-acct summary::-webkit-details-marker{display:none}
.fl-acct summary::after{content:" ▾"}
.fl-acct-menu{position:absolute;right:0;top:calc(100% + 6px);z-index:50;min-width:160px;background:var(--surface);border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 24px rgba(0,0,0,.12);padding:6px;display:flex;flex-direction:column}
.fl-acct-menu a,.fl-acct-menu button{display:block;width:100%;text-align:left;padding:8px 10px;border-radius:6px;font:inherit;font-size:13.5px;font-weight:400;color:var(--ink);text-decoration:none;background:none;border:0;cursor:pointer}
.fl-acct-menu a:hover,.fl-acct-menu button:hover{background:var(--line)}
.mainnav{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:6}
.mainnav .wrap{display:flex;gap:0;position:relative;overflow:visible}
.mainnav .nav-list{display:flex;flex-wrap:wrap;gap:0;overflow:visible;flex:1;min-width:0}
.mainnav a{display:inline-flex;align-items:center;gap:6px;padding:12px 13px;color:var(--muted);text-decoration:none;font-weight:600;font-size:14px;border-bottom:2px solid transparent;white-space:nowrap;margin-bottom:-1px}
.mainnav a:hover{color:var(--ink)}
.mainnav a[aria-current=page]{color:var(--ink);border-bottom-color:var(--accent)}
.mainnav .gap{width:1px;background:var(--line);margin:10px 6px;flex:none}
.mainnav .nav-toggle{display:none;align-items:center;gap:8px;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:8px 12px;margin:8px 0;font:inherit;font-weight:600;font-size:14px;cursor:pointer;color:var(--ink)}
.nav-toggle .caret{display:inline-block;transition:transform .15s;color:var(--muted)}
.nav-toggle[aria-expanded=true] .caret{transform:rotate(180deg)}
@media (max-width:900px){
  .mainnav .wrap{display:block}
  .mainnav .nav-toggle{display:inline-flex}
  .mainnav .nav-list{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;flex-wrap:nowrap;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(0,0,0,.14);padding:4px 16px 10px;z-index:7}
  .mainnav.open .nav-list{display:flex}
  .mainnav a{padding:12px 8px;border-bottom:1px solid var(--line);margin:0;font-size:15px}
  .mainnav a[aria-current=page]{border-bottom-color:var(--line);color:var(--accent)}
  .mainnav .gap{display:none}
}
@media (prefers-reduced-motion:reduce){.nav-toggle .caret{transition:none}}
@media (min-width:1280px){.topbar,.mainnav{max-width:1208px;margin-inline:auto}.topbar{border-inline:1px solid var(--line)}.mainnav{border:1px solid var(--line);border-top:0;border-radius:0 0 12px 12px}.topbar .wrap,.mainnav .wrap{max-width:none}}
.bo-tabs{display:flex;gap:4px;overflow-x:auto;border-bottom:2px solid var(--accent);margin:0 0 20px;scrollbar-width:thin}
.bo-tabs a{padding:9px 14px;border:1px solid var(--line);border-bottom:0;border-radius:8px 8px 0 0;background:var(--surface);color:var(--ink);font-weight:600;font-size:14px;text-decoration:none;white-space:nowrap}
.bo-tabs a[aria-current=page]{background:var(--accent);border-color:var(--accent);color:#fff}
@media (prefers-color-scheme:dark){.fl-auth .fl-signup,.bo-tabs a[aria-current=page]{color:#06201A}}