/* Site header shared by every tool. Uses the page's own tokens. */
.site-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding-block:14px 0;max-width:1280px;margin:0 auto}
.site-brand{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding-right:4px;text-decoration:none;color:var(--fg);font-weight:700;letter-spacing:.06em;font-size:16px;white-space:nowrap}
.site-brand img{width:28px;height:28px;border-radius:7px;display:block}
.site-nav{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;-webkit-overflow-scrolling:touch;min-width:0;flex:1}
.site-nav::-webkit-scrollbar{display:none}
.site-nav a{flex:none;text-decoration:none;color:var(--muted);font-size:15px;padding:0 14px;min-height:40px;display:inline-flex;align-items:center;border-radius:99px;border:1px solid transparent;white-space:nowrap}
.site-nav a:hover{color:var(--fg);border-color:var(--line)}
.site-nav a[aria-current="page"]{color:var(--accent);background:var(--accent-soft);font-weight:700}
.site-nav a:focus-visible,.site-brand:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (max-width:639px){.site-head{gap:8px}.site-nav{flex-basis:100%}}
@media print{.site-head{display:none!important}}
/* 意見回饋：右下角小按鈕與對話框 */
.fb-fab{position:fixed;right:max(16px,env(safe-area-inset-right,0px));bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:20;
  font:inherit;font-size:14px;font-weight:500;color:var(--muted);background:var(--surface);border:1px solid var(--line-strong);border-radius:99px;
  min-height:40px;padding:0 14px;cursor:pointer;box-shadow:0 2px 10px rgba(0,0,0,.08)}
.fb-fab:hover{color:var(--accent);border-color:var(--accent)}
.fb-fab:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.fb-dlg{border:1px solid var(--line);border-radius:16px;padding:0;background:var(--surface);color:var(--fg);width:min(480px,calc(100vw - 32px));max-height:calc(100dvh - 32px)}
.fb-dlg::backdrop{background:rgba(10,14,20,.45)}
.fb-form{display:grid;gap:10px;padding:22px}
.fb-form h2{margin:0;font-family:var(--f-head);font-size:22px;letter-spacing:.06em}
.fb-sub{margin:0 0 4px;color:var(--muted);font-size:15px}
.fb-lbl{font-size:15px;color:var(--muted);font-weight:500;margin-top:4px}
.fb-kinds{display:flex;flex-wrap:wrap;gap:8px}
.fb-kinds label{display:inline-flex;align-items:center;min-height:40px;padding:0 14px;border:1px solid var(--line-strong);border-radius:99px;cursor:pointer;font-size:15px}
.fb-kinds input{position:absolute;opacity:0;pointer-events:none}
.fb-kinds label:has(input:checked){background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:700}
.fb-kinds label:has(input:focus-visible){outline:2px solid var(--accent);outline-offset:2px}
.fb-form textarea{font:inherit;font-size:16px;color:var(--fg);background:var(--sunk);border:1px solid var(--line-strong);border-radius:8px;padding:10px 12px;resize:vertical;min-height:120px;width:100%}
.fb-form textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);background:var(--surface)}
.fb-msg{margin:0;min-height:1.5em;font-size:15px;color:var(--accent)}
.fb-act{display:flex;justify-content:flex-end;gap:10px}
@media (max-width:639px){.fb-fab{font-size:13px;min-height:36px;padding:0 12px}}
@media print{.fb-fab{display:none!important}}