:root{color-scheme:dark;--bg:#0b1120;--card:#131d31;--line:#263653;--accent:#22c55e;--ink:#f4f7fb;--muted:#9eb0cb;--danger:#fca5a5}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at top,#1c3158,var(--bg) 56%);color:var(--ink);font:16px system-ui,sans-serif;min-height:100svh}main{max-width:720px;margin:auto;padding:calc(24px + env(safe-area-inset-top)) 20px}.card{background:#131d31dd;border:1px solid var(--line);border-radius:24px;padding:24px;box-shadow:0 20px 60px #0006;margin-bottom:16px}h1{margin:2px 0 14px;font-size:30px}h2{font-size:16px;margin:20px 0 8px}.eyebrow{color:#76a7f9;letter-spacing:.12em;font-size:12px;font-weight:800;margin:0}.hint,#speakers{color:var(--muted);line-height:1.45}label{display:block;font-size:14px;font-weight:650;margin:13px 0}input,button,select{font:inherit}input,select{display:block;width:100%;margin-top:7px;padding:12px;border-radius:12px;border:1px solid var(--line);background:#0d1525;color:var(--ink)}select[multiple]{min-height:100px}button{border:0;border-radius:14px;padding:14px;width:100%;background:var(--accent);color:#05210f;font-weight:850;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}.quiet{width:auto;background:transparent;color:var(--ink);border:1px solid var(--line);padding:9px 12px}header,.topbar,.sectionHeader{display:flex;justify-content:space-between;gap:12px;align-items:start}.topbar{margin:0 4px 18px}.list{display:grid;gap:9px}.group{text-align:left;background:#17253e;color:var(--ink);border:1px solid var(--line)}#speakers{min-height:48px;padding:13px;background:#0c1526;border-radius:12px;margin:18px 0}#ptt{height:270px;border-radius:50%;background:linear-gradient(145deg,#2563eb,#1d4ed8);color:#fff;box-shadow:0 12px 0 #172554,0 22px 45px #0008;touch-action:none;display:block;margin:28px auto;font-size:22px;max-width:270px}#ptt small{display:block;font-size:13px;margin-top:8px;font-weight:600;opacity:.85}#ptt.talking{background:linear-gradient(145deg,#f97316,#dc2626);transform:translateY(10px);box-shadow:0 2px 0 #7f1d1d,0 12px 28px #0008}.split,.adminGrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.compactList{list-style:none;padding:0;margin:0;color:var(--muted);font-size:14px}.compactList li{border-bottom:1px solid var(--line);padding:7px 0}.membership{padding:14px;border:1px solid var(--line);border-radius:12px}.membership strong{display:block;margin-bottom:8px}.hidden{display:none!important}[role=alert]{min-height:1.25em;color:var(--danger);font-weight:600}@media(max-width:520px){main{padding-inline:12px}.card{padding:20px}#ptt{height:240px;max-width:240px}.split,.adminGrid{grid-template-columns:1fr}.sectionHeader h1{font-size:24px}}