*{box-sizing:border-box}body{font-family:-apple-system,"PingFang TC","Noto Sans TC",sans-serif;margin:0;background:#f4f5f7;max-width:720px;margin:auto;padding:8px}
.hidden{display:none!important}header{padding:8px 0;display:flex;gap:8px;align-items:center}#status{margin-left:auto;font-size:14px;color:#555}
#mode{font-size:12px;background:#ffd54f;border-radius:4px;padding:1px 6px}.row{display:flex;gap:6px;margin:6px 0;align-items:center}
input,select,textarea,button{font-size:16px;padding:10px;border-radius:8px;border:1px solid #ccc}#to,textarea{flex:1;width:100%}
button{background:#fff;cursor:pointer}button:disabled{opacity:.4}.green{background:#2e7d32;color:#fff;flex:1}.red{background:#c62828;color:#fff;flex:1}
#sendBtn{background:#1565c0;color:#fff;margin-left:auto}#subs{background:#fff;border-radius:8px;height:45vh;overflow-y:auto;padding:8px}
.l{margin:6px 0;padding:8px;border-radius:8px;max-width:88%}.them{background:#eef}.me{background:#e8f5e9;margin-left:auto;text-align:right}
.l .o{font-size:13px;color:#666}.l .t{font-size:18px}.speaking{opacity:.6}#quick{display:flex;flex-wrap:wrap;gap:4px;margin:6px 0}
#quick button{font-size:13px;padding:6px 8px}label{font-size:13px}.card{background:#fff;padding:20px;margin-top:20vh;border-radius:12px;display:flex;flex-direction:column;gap:10px}
.err{color:#c62828}#summary{background:#fff;padding:10px;border-radius:8px;margin-top:8px;white-space:pre-wrap}
#keypadBox{background:#fff;border-radius:8px;padding:6px 8px;margin:6px 0}#keypadBox summary{font-size:15px;padding:6px 0;cursor:pointer}
#keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;max-width:360px;margin:6px auto}#keypad button{font-size:24px;padding:12px 0;touch-action:manipulation}
#keypad button:active{background:#e3f2fd}#dtmfStr{flex:1}#dtmfLog{font-size:13px;color:#555;min-height:1em}.dtmf{background:#fff3e0;font-family:monospace}
.listen #vol{flex:1;padding:0}#listenBtn[aria-pressed=true]{background:#6a1b9a;color:#fff}#listenInfo{font-size:12px;color:#666;min-width:3em}
#banner{background:#fff3cd;color:#7a4b00;border:1px solid #f0c36d;border-radius:8px;padding:8px;margin:6px 0;font-size:14px}