:root{--line: #e2e8f0;--muted: #64748b;--accent: #0f766e;--danger: #b91c1c;--warn: #b45309;--bg: #f8fafc}*{box-sizing:border-box}body{margin:0;font:14px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#0f172a;background:var(--bg)}a{color:var(--accent);text-decoration:none}.layout{display:flex;min-height:100vh}.side{width:220px;background:#0f172a;color:#e2e8f0;padding:16px 0;flex-shrink:0}.side h1{font-size:16px;margin:0 16px 16px}.side a{display:block;padding:10px 16px;color:#cbd5e1}.side a.active,.side a:hover{background:#1e293b;color:#fff}.main{flex:1;padding:20px;overflow-x:auto}.head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}h2{margin:0 0 4px;font-size:20px}.muted{color:var(--muted);font-size:13px}table{border-collapse:collapse;width:100%;background:#fff;margin-top:12px}th,td{border-bottom:1px solid var(--line);padding:8px 10px;text-align:left}th{background:#f1f5f9;font-weight:600}td.num,th.num{text-align:right;white-space:nowrap}button{background:var(--accent);color:#fff;border:0;border-radius:6px;padding:8px 14px;cursor:pointer;font:inherit}button.ghost{background:transparent;color:var(--accent)}button.danger{background:var(--danger)}button:disabled{opacity:.5;cursor:not-allowed}input,select,textarea{border:1px solid var(--line);border-radius:6px;padding:7px 9px;font:inherit;width:100%}label{display:block;font-size:13px;margin-bottom:4px;color:#334155}.field{margin-bottom:10px}.row{display:flex;gap:10px}.row>*{flex:1}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px;margin:12px 0}.card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 12px}.card .value{font-size:20px;font-weight:600}.modal-back{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172a73;display:flex;align-items:center;justify-content:center;padding:16px}.modal{background:#fff;border-radius:10px;padding:18px;width:460px;max-width:100%}.modal h3{margin:0 0 12px}.actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}.error{color:var(--danger);font-size:13px;margin-top:8px}.warn{color:var(--warn)}.ok{color:var(--accent)}.bad{color:var(--danger)}.note{background:#fffbeb;border:1px solid #fde68a;border-radius:8px;padding:10px;margin:10px 0}.login{max-width:320px;margin:12vh auto;background:#fff;padding:22px;border-radius:10px;border:1px solid var(--line)}.book-picker{width:100%;margin:8px 0 14px;padding:6px 8px;border:1px solid var(--line);border-radius:6px;background:#fff;font-size:13px}