:root{--bg: #f7f6f3;--surface: #ffffff;--border: #e3e0d8;--text: #23211d;--muted: #6b675e;--accent: #7a4a2b;--accent-fg: #ffffff;--danger: #a3341f;--loan: #b5761d;--overdue-bg: #fbe9e6;--shadow: 0 1px 3px rgba(0, 0, 0, .08);color-scheme:light dark}@media (prefers-color-scheme: dark){:root{--bg: #1b1a17;--surface: #262420;--border: #3a372f;--text: #ece8df;--muted: #a29c8e;--accent: #c98a5c;--accent-fg: #1b1a17;--danger: #e0745c;--loan: #d9a441;--overdue-bg: #3a2320;--shadow: 0 1px 3px rgba(0, 0, 0, .4)}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}a{color:var(--accent)}button{font:inherit;padding:.5rem .9rem;border:1px solid var(--accent);border-radius:8px;background:var(--accent);color:var(--accent-fg);cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--surface);color:var(--text);border-color:var(--border)}.btn-danger{background:transparent;color:var(--danger);border-color:var(--danger)}input,textarea{font:inherit;padding:.5rem .65rem;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);width:100%}.app{max-width:1040px;margin:0 auto;padding:0 1rem 4rem}.topbar{display:flex;align-items:center;justify-content:space-between;padding:1rem 0;border-bottom:1px solid var(--border);margin-bottom:1.5rem}.brand{font-weight:700;font-size:1.15rem;text-decoration:none;color:var(--text)}.topbar nav{display:flex;gap:1rem}.topbar nav a{text-decoration:none;color:var(--muted);padding:.25rem 0;border-bottom:2px solid transparent}.topbar nav a.active{color:var(--text);border-bottom-color:var(--accent)}.add-form{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1rem}.add-form input{flex:1 1 260px}.add-form button{flex:0 0 auto}.add-form__error{flex-basis:100%;margin:.25rem 0 0;color:var(--danger)}.toolbar{display:flex;gap:.75rem;align-items:center;flex-wrap:wrap;margin-bottom:1.25rem}.search{flex:1 1 220px}.filters{display:flex;gap:.25rem}.filter{background:var(--surface);color:var(--muted);border-color:var(--border);padding:.4rem .75rem}.filter.active{background:var(--accent);color:var(--accent-fg);border-color:var(--accent)}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:1.25rem}.book-card{text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:.5rem}.cover-wrap{position:relative}.cover{width:100%;aspect-ratio:2 / 3;object-fit:cover;border-radius:8px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);display:block}.cover--placeholder{display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:.85rem}.cover--large{width:220px;max-width:100%}.badge{position:absolute;top:.4rem;left:.4rem;font-size:.7rem;font-weight:600;padding:.15rem .4rem;border-radius:5px;background:var(--loan);color:#fff}.book-card__title{font-weight:600;font-size:.9rem}.book-card__authors{font-size:.8rem;color:var(--muted)}.back-link{display:inline-block;margin-bottom:1rem;text-decoration:none}.book-detail{display:flex;gap:2rem;flex-wrap:wrap}.book-detail__body{flex:1 1 320px}.book-detail__body h1{margin:0 0 .25rem;font-size:1.5rem}.book-detail__authors{margin:0 0 1rem;color:var(--muted)}.facts{display:grid;grid-template-columns:max-content 1fr;gap:.35rem 1rem;margin:1.25rem 0;font-size:.9rem}.facts dt{color:var(--muted)}.facts dd{margin:0}.loan-banner{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--loan);border-radius:8px;padding:.6rem .85rem;margin:.5rem 0 1rem;font-size:.9rem;display:flex;flex-wrap:wrap;align-items:center;gap:.5rem}.loan-banner--overdue{border-left-color:var(--danger);background:var(--overdue-bg)}.notes-field{display:block;margin:1rem 0;font-size:.9rem;color:var(--muted)}.notes-field textarea{margin:.35rem 0;color:var(--text)}.book-detail__tools{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.5rem}table{width:100%;border-collapse:collapse;font-size:.9rem}th,td{text-align:left;padding:.5rem .6rem;border-bottom:1px solid var(--border)}th{color:var(--muted);font-weight:600}.loan-history{margin-top:2.5rem}tr.overdue{background:var(--overdue-bg)}.pill{display:inline-block;margin-left:.4rem;font-size:.7rem;padding:.1rem .4rem;border-radius:5px}.pill--overdue{background:var(--danger);color:#fff}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;padding:1rem}.modal{background:var(--surface);border-radius:12px;padding:1.5rem;width:100%;max-width:380px;box-shadow:0 10px 40px #00000040}.modal h2{margin:0}.modal__subtitle{margin:.15rem 0 1rem;color:var(--muted);font-size:.9rem}.modal label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:.75rem}.modal label input{margin-top:.25rem;color:var(--text)}.modal__actions{display:flex;justify-content:flex-end;gap:.5rem;margin-top:1rem}.muted{color:var(--muted)}.toast{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:8px;padding:.6rem .85rem;margin-bottom:1rem;font-size:.9rem}.error-block{color:var(--danger)}.centered{display:flex;align-items:center;justify-content:center;min-height:60vh}.auth-card{max-width:380px;margin:12vh auto 0;padding:1.75rem;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow)}.auth-card h1{margin:0 0 1rem;font-size:1.35rem}.auth-card form{display:flex;flex-direction:column;gap:.75rem}.auth-card label,.page-narrow .stack label,.modal label{display:block;font-size:.82rem;color:var(--muted)}.auth-card label input{margin-top:.3rem;color:var(--text)}.auth-card button[type=submit]{margin-top:.25rem}.auth-card__foot{margin:1rem 0 0;font-size:.85rem}.page-narrow{max-width:720px;margin:0 auto}.page-narrow h2{margin-top:2rem;font-size:1.1rem}.stack{display:flex;flex-direction:column;gap:.75rem;max-width:360px}.stack label input{margin-top:.3rem;color:var(--text)}.notice{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--loan);border-radius:8px;padding:.6rem .85rem;font-size:.9rem;overflow-wrap:anywhere}.notice--ok{border-left-color:#3c8c53}.notice code{font-size:.8rem}.topbar__left{display:flex;align-items:center;gap:.85rem}.topbar__nav{display:flex;align-items:center;gap:1rem}.lib-switcher{width:auto;max-width:220px;padding:.35rem .5rem;font-size:.85rem}.usermenu{position:relative}.usermenu__btn{background:var(--surface);color:var(--text);border-color:var(--border);padding:.35rem .6rem;font-size:.85rem;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.usermenu__pop{position:absolute;right:0;top:calc(100% + 4px);background:var(--surface);border:1px solid var(--border);border-radius:8px;box-shadow:0 8px 24px #0003;display:flex;flex-direction:column;min-width:140px;z-index:20}.usermenu__pop button{background:none;border:none;color:var(--text);text-align:left;padding:.55rem .8rem;border-radius:0}.usermenu__pop button:hover{background:var(--bg)}.lib-list{list-style:none;padding:0;margin:1.5rem 0 0;display:flex;flex-direction:column;gap:.75rem}.lib-list li{border:1px solid var(--border);border-radius:10px;padding:.85rem 1rem;background:var(--surface)}.lib-list__main{display:flex;align-items:center;gap:.6rem}.lib-list__name{font-weight:600;text-decoration:none;color:var(--text);font-size:1.05rem}.lib-list__meta{font-size:.82rem;margin-top:.2rem}.lib-list__actions{display:flex;gap:.5rem;margin-top:.7rem;flex-wrap:wrap}.pill{display:inline-block;font-size:.68rem;font-weight:600;text-transform:uppercase;letter-spacing:.03em;padding:.1rem .45rem;border-radius:5px;background:var(--border);color:var(--text)}.pill--owner{background:var(--accent);color:var(--accent-fg)}.members-table,.invite-list{width:100%;margin-top:1rem}.members-table select{width:auto;padding:.25rem .4rem}.invite-list{list-style:none;padding:0;display:flex;flex-direction:column;gap:.4rem}.invite-list li{display:flex;justify-content:space-between;align-items:center;border:1px solid var(--border);border-radius:8px;padding:.45rem .7rem;font-size:.9rem}.edit-form{display:flex;flex-direction:column;gap:.75rem;max-width:460px}.edit-form label{display:block;font-size:.82rem;color:var(--muted)}.edit-form label input{margin-top:.3rem;color:var(--text)}.edit-form__row{display:flex;gap:.6rem}.edit-form__row label{flex:1}