.chal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:90;background:#0000009e;display:flex;align-items:center;justify-content:center;padding:20px}.chal-backdrop[hidden]{display:none}.chal-card{width:360px;max-width:92vw;background:var(--bg);border:1px solid var(--border);border-radius:14px;padding:18px;box-shadow:0 12px 40px #0006;font-family:Roboto,Segoe UI,system-ui,sans-serif}.chal-title{font-size:15px;font-weight:700;color:var(--fg);margin-bottom:10px}.chal-msg{font-size:14px;color:var(--fg);line-height:1.45}.chal-books{font-size:13px;color:var(--muted);line-height:1.45;margin-top:8px}.chal-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px;margin-top:16px}.chal-actions[hidden]{display:none}.chal-btn{font:inherit;font-size:13.5px;cursor:pointer;padding:7px 14px;border-radius:8px;border:1px solid var(--border);background:var(--card, var(--bg));color:var(--fg)}.chal-btn:hover{border-color:var(--accent)}.chal-btn.primary{background:var(--fg);color:var(--bg);border-color:var(--fg)}.chal-ok{color:#2e7d4f;font-weight:600}.chal-err{color:#c4432b}.rp-line{position:fixed;z-index:50;pointer-events:none;opacity:.5;transition:none}.rp-day{right:0;bottom:0;width:3px;height:0}.rp-session{left:0;bottom:0;height:3px;width:0}