*{box-sizing:border-box}:root{--bg:#0f172a;--surface:#1e293b;--surface-alt:#334155;--border:#334155;--text:#e2e8f0;--text-muted:#94a3b8;--text-faint:#64748b;--accent:#6366f1;--accent-hover:#4f46e5;--bubble-other:#334155;--success:#34d399;--danger:#f87171}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;transition:background .2s,color .2s}.app{justify-content:center;align-items:center;min-height:100vh;display:flex}.join-screen{justify-content:center;align-items:center;width:100%;padding:24px;display:flex;position:relative}.join-card{background:var(--surface);border-radius:16px;width:100%;max-width:420px;padding:40px;box-shadow:0 20px 60px #00000026}.join-card h1{margin:0 0 8px;font-size:26px}.subtitle{color:var(--text-muted);margin:0 0 28px;font-size:14px}label{color:var(--text-muted);margin-top:16px;margin-bottom:6px;font-size:13px;display:block}input[type=text]{border:1px solid 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