:root{color-scheme:light dark;--bg: #0f172a;--surface: #1e293b;--border: #334155;--text: #e2e8f0;--text-muted: #94a3b8;--accent: #38bdf8;--accent-strong: #0ea5e9;--danger: #f87171;--ok: #4ade80;--ptt-clear: #4ade80;--ptt-lockout: #facc15;--ptt-tx-base: #7f1d1d;--ptt-tx-fill: #ef4444;font-family:system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.4}main{max-width:640px;margin:0 auto;padding:1.5rem 1rem 4rem}h1{font-size:1.5rem;margin:0 0 1rem}h2{font-size:1.1rem;margin:1.75rem 0 .5rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em}h3{font-size:1rem;margin:0 0 .25rem}ul{list-style:none;margin:0;padding:0}li{padding:.4rem 0;border-bottom:1px solid var(--border)}form{display:flex;flex-direction:column;gap:.5rem;margin-top:.5rem}form.inline-form{flex-direction:row;flex-wrap:wrap;align-items:center}.inline-form input,.inline-form select{flex:1 1 140px}input,select{width:100%;min-width:0;background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:.4rem .6rem;font-size:.95rem}input:focus,select:focus,button:focus-visible{outline:2px solid var(--accent);outline-offset:1px}button{background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:.4rem .8rem;font-size:.9rem;cursor:pointer}button:hover:not(:disabled){border-color:var(--accent)}button:disabled{opacity:.5;cursor:not-allowed}.ptt-button{display:block;width:100%;padding:.9rem;font-size:1.05rem;font-weight:600;transition:background 60ms linear}.ptt-button:disabled{opacity:1;cursor:not-allowed}.ptt-button--clear{background:var(--ptt-clear);border-color:var(--ptt-clear);color:#04240e}.ptt-button--lockout{background:var(--ptt-lockout);border-color:var(--ptt-lockout);color:#3a2b00}.ptt-button--tx{--vu-level: 0%;background:linear-gradient(to right,var(--ptt-tx-fill) var(--vu-level),var(--ptt-tx-base) var(--vu-level));border-color:var(--ptt-tx-base);color:#fff}[role=tablist]{display:flex;gap:.5rem;margin-bottom:1rem}[role=tablist] button[aria-pressed=true]{background:var(--accent-strong);border-color:var(--accent-strong);color:#04202e;font-weight:600}[role=alert]{color:var(--danger);font-size:.9rem;margin:.5rem 0}.app-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}.app-header h1{margin:0}.header-actions{display:flex;align-items:center;gap:.75rem}.signal-meter{display:inline-flex;align-items:center;gap:.35rem;background:transparent;border:none;padding:.3rem}.signal-meter:hover:not(:disabled){border-color:transparent}.signal-meter-bars{display:flex;align-items:flex-end;gap:2px;height:14px}.signal-meter-bar{width:4px;background:var(--border);border-radius:1px}.signal-meter-bar:nth-child(1){height:25%}.signal-meter-bar:nth-child(2){height:50%}.signal-meter-bar:nth-child(3){height:75%}.signal-meter-bar:nth-child(4){height:100%}.signal-meter-bar--active{background:var(--ok)}.signal-meter-value{font-size:.8rem;color:var(--text-muted)}.section-header{display:flex;align-items:center;justify-content:space-between}.section-header h2{margin:1.75rem 0 .5rem}.icon-button{line-height:1;padding:.3rem .6rem}.talkgroup-row{display:flex;align-items:center;justify-content:space-between;gap:.5rem}.tg-card{border:1px solid var(--border);border-radius:8px;padding:.75rem 1rem 1rem;margin:1rem 0}.tg-card details{margin-top:.5rem}.tg-card summary{cursor:pointer;color:var(--text-muted);font-size:.9rem}.level-meter{background:var(--surface);border:1px solid var(--border);border-radius:999px;height:10px;overflow:hidden;margin:.4rem 0 .6rem}.level-meter-fill{height:100%;background:var(--ok);transition:width 80ms linear}