:root{--ink:#1d1c1a;--mute:#6f6a5e;--line:#cfc9bc;--bg:#fff;--soft:#f6f4ef;--warn:#a33;--me:#e6ecf4}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.7 -apple-system,system-ui,"Hiragino Sans","Noto Sans JP",sans-serif}
main{padding:16px 18px 24px;max-width:680px;margin:0 auto}
h1,h2{font-size:17px;margin:0 0 6px}
p{margin:6px 0}
.fb-mute{color:var(--mute);font-size:13px}
.fb-dest{border:1px solid var(--line);background:var(--soft);padding:10px 12px;margin:0 0 12px;border-radius:6px}
.fb-dest .fb-domain{font-size:20px;font-weight:700;word-break:break-all}
.fb-dest.fb-small .fb-domain{font-size:14px}
label{display:block;font-size:13px;color:#5a554b;margin-top:10px}
label.fb-check{display:flex;gap:8px;align-items:flex-start;color:var(--ink);font-size:14px}
label.fb-check input{width:20px;height:20px;flex:none;margin:2px 0 0}
input,textarea,select{font:inherit;padding:9px 10px;border:1px solid var(--line);width:100%;background:#fff;border-radius:4px;color:var(--ink)}
textarea{resize:vertical}
button,.fb-btn{font:inherit;display:inline-block;padding:9px 18px;border:1px solid var(--ink);background:var(--ink);color:#fff;cursor:pointer;border-radius:4px;text-decoration:none}
button.fb-sub,.fb-btn.fb-sub{background:#fff;color:var(--ink)}
button:disabled{opacity:.5;cursor:default}
.fb-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px;align-items:center}
.fb-key{font-family:ui-monospace,Menlo,monospace;font-size:13px;word-break:break-all;padding:10px 12px;border:1px dashed var(--ink);background:#fff;margin:8px 0;user-select:all;-webkit-user-select:all}
.fb-err{color:var(--warn);font-size:13px;margin-top:8px}
.fb-box{border:2px solid var(--warn);background:#fdf0ee;padding:12px 14px;border-radius:6px;margin:8px 0}
.fb-contact{white-space:pre-wrap;font-weight:600}
.fb-log{max-height:340px;overflow:auto;padding:10px 0;border-top:1px solid #e3ded3;border-bottom:1px solid #e3ded3;margin:12px 0}
.fb-m{margin:6px 0;padding:8px 12px;border-radius:7px;background:var(--soft);max-width:85%;white-space:pre-wrap;word-break:break-word}
.fb-m.me{background:var(--me);margin-left:auto}
.fb-m.sys{background:none;color:var(--mute);font-size:12px;text-align:center;max-width:100%}
.fb-m small{display:block;color:var(--mute);font-size:11px;margin-top:2px}
.fb-send{display:flex;gap:8px;align-items:stretch}
.fb-send textarea{height:64px;resize:none}
.fb-send button{white-space:nowrap;padding:0 18px}
ul.fb-notes{margin:8px 0;padding-left:1.2em;color:var(--mute);font-size:13px}
.fb-hp{position:absolute;left:-10000px;top:auto;width:1px;height:1px;overflow:hidden}
.fb-copybox{position:fixed;left:-9999px;top:0;opacity:0}
.fb-foot{margin-top:18px;color:var(--mute);font-size:11.5px}