:root{--bg: #0f1115;--bg-elev: #171a21;--bg-elev-2: #1f242e;--border: #2a313d;--text: #e7ebf2;--muted: #8a93a3;--accent: #5b8cff;--accent-dim: #38507f;--good: #3ecf8e;--warn: #f0b429;--bad: #f06363;--reading: #3a3f4b;--shadow: 0 10px 30px rgba(0, 0, 0, .45);--bar-h: 52px;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font:15px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;-webkit-text-size-adjust:100%;overscroll-behavior:none}#app,.tandem{height:100%}.tandem{display:flex;flex-direction:column}.topbar{flex:0 0 auto;height:var(--bar-h);display:flex;align-items:center;gap:10px;padding:0 10px;padding-top:env(safe-area-inset-top,0);background:linear-gradient(180deg,var(--bg-elev),var(--bg-elev-2));border-bottom:1px solid var(--border);z-index:20}.brand{display:flex;align-items:center;gap:8px;font-weight:700;letter-spacing:.02em;font-size:16px;padding-right:2px}.brand-logo{width:26px;height:26px;display:block}.brand-text{white-space:nowrap}.spacer{flex:1 1 auto}.chip{font:inherit;font-weight:600;letter-spacing:.06em;color:var(--text);background:var(--bg-elev-2);border:1px solid var(--border);border-radius:999px;padding:5px 12px;cursor:pointer}.chip:hover{border-color:var(--accent-dim)}.presence{display:flex;align-items:center;gap:6px}.presence-count{font-variant-numeric:tabular-nums;font-weight:700}.muted{color:var(--muted)}.dot{width:9px;height:9px;border-radius:50%;background:var(--muted);transition:background .2s}.dot.s-open{background:var(--good);box-shadow:0 0 8px var(--good)}.dot.s-connecting{background:var(--warn);animation:pulse 1s ease-in-out infinite}.dot.s-closed{background:var(--bad)}@keyframes pulse{50%{opacity:.35}}.page-indicator{color:var(--muted);font-variant-numeric:tabular-nums;font-size:14px}.btn{font:inherit;font-weight:600;color:var(--text);background:var(--bg-elev-2);border:1px solid var(--border);border-radius:8px;padding:7px 11px;cursor:pointer;white-space:nowrap}.btn:hover{border-color:var(--accent-dim)}.btn:active{transform:translateY(1px)}.btn.icon{width:38px;padding:7px 0;text-align:center;font-size:18px;line-height:1}.btn.icon.active,.sync-btn.on{color:#0b1220;background:var(--accent);border-color:var(--accent)}.sync-btn.off{color:var(--muted)}.drawer{flex:0 0 auto;overflow:hidden;max-height:0;background:var(--bg-elev);border-bottom:1px solid transparent;transition:max-height .25s ease,border-color .25s}.drawer.open{max-height:78vh;overflow-y:auto;border-bottom-color:var(--border)}.drawer .row,.drawer .help{margin:0 14px}.drawer .row:first-child{margin-top:14px}.drawer .help{margin-bottom:14px}.row{display:flex;gap:10px;align-items:flex-end;margin-bottom:10px;flex-wrap:wrap}.field{display:flex;flex-direction:column;gap:4px;flex:1 1 220px}.field-label{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}.text-input{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:9px 11px;width:100%}.text-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #5b8cff2e}.help{color:var(--muted);font-size:13px;margin:4px 0 0}.hidden-file{display:none}.btn.wide{align-self:stretch}.recents{margin:2px 14px 6px}.recents:empty{display:none}.recents-title{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:6px}.recent-item{display:flex;align-items:center;gap:6px;margin-bottom:6px}.recent-open{flex:1 1 auto;text-align:left;font:inherit;color:var(--text);background:var(--bg-elev-2);border:1px solid var(--border);border-radius:8px;padding:8px 11px;cursor:pointer;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.recent-open:hover{border-color:var(--accent-dim)}.recent-del{flex:0 0 auto;font:inherit;color:var(--muted);background:transparent;border:1px solid var(--border);border-radius:8px;padding:8px 10px;cursor:pointer}.recent-del:hover{color:var(--bad);border-color:var(--bad)}.loader-row{flex-wrap:nowrap;align-items:stretch;gap:8px}.select-input{flex:0 0 auto;font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:9px 10px;cursor:pointer}.select-input:focus{outline:none;border-color:var(--accent)}.loader-row .text-input{flex:1 1 auto;min-width:0}.loader-row .text-input:read-only{color:var(--muted);background:var(--bg-elev-2);cursor:default}.loader-row .btn{flex:0 0 auto}.drawer-collapse{display:block;width:100%;margin-top:6px;font:inherit;font-weight:600;font-size:13px;color:var(--muted);background:var(--bg-elev-2);border:0;border-top:1px solid var(--border);padding:10px 0;cursor:pointer}.drawer-collapse:hover{color:var(--text)}.section-header{display:block;width:calc(100% - 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