/* QNX Library v2.4 - Clasico + Auth + Prestamos + Catalogo avanzado */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Merriweather:wght@700;900&display=swap');

:root{
  --navy:#0B1C2B;
  --blue:#145a8a;
  --gold:#C9A86A;
  --cream:#fdfbf6;
  --ink:#1a2e40;
  --muted:#5b7086;
  --border:#e2e8f0;
  --radius:12px;
  --success:#0e7c3e;
  --danger:#c0392b;
}

*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Inter',sans-serif;background:var(--cream);color:var(--ink);line-height:1.6}
a{color:inherit;text-decoration:none}

/* Header */
header{
  background:#fff;
  border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:20;
  display:flex;justify-content:space-between;align-items:center;
  padding:0.9rem 2rem;
}
.brand{display:flex;align-items:center;gap:0.7rem;font-weight:900;color:var(--navy)}
.brand-logo{width:42px;height:42px;border-radius:50%;border:2px solid var(--navy);display:grid;place-items:center;background:#fff}
.brand-logo svg{width:36px;height:36px}
.brand strong{font-family:'Merriweather',serif;font-size:1.15rem;line-height:1}
.brand small{display:block;font-size:0.55rem;letter-spacing:0.25em;text-transform:uppercase;color:var(--muted);font-family:'Inter',sans-serif}
nav{display:flex;gap:0.3rem;align-items:center;flex-wrap:wrap}
nav a{padding:0.45rem 0.9rem;border-radius:999px;font-size:0.85rem;font-weight:600;color:var(--ink)}
nav a:hover{background:#eef4fa}
nav a.active{background:var(--navy);color:#fff}
.nav-user{font-size:0.8rem;color:var(--muted);margin-left:0.4rem}
.btn-logout{background:transparent;border:1px solid var(--border);padding:0.35rem 0.8rem;border-radius:999px;font-size:0.8rem;cursor:pointer;color:var(--muted)}
.btn-logout:hover{border-color:var(--danger);color:var(--danger)}

/* Hero */
.hero{
  background:#fff;
  border-bottom:1px solid var(--border);
  text-align:center;
  padding:2.8rem 1.5rem;
}
.hero h1{font-family:'Merriweather',serif;font-size:2.2rem;color:var(--navy);line-height:1.1;margin-bottom:0.6rem}
.hero h1 em{color:var(--blue);font-style:italic;font-weight:400}
.hero p{color:var(--muted);max-width:560px;margin:0 auto 1.3rem}
.searchbar{
  display:flex;gap:0.5rem;max-width:520px;margin:0 auto;
  background:#fff;border:1.5px solid var(--border);border-radius:999px;
  padding:0.4rem 0.4rem 0.4rem 1rem;
}
.searchbar input{flex:1;border:none;outline:none;font-size:0.92rem;background:transparent}
.searchbar button{background:var(--navy);color:#fff;border:none;padding:0.6rem 1.1rem;border-radius:999px;font-weight:700;cursor:pointer}
.searchbar button:hover{background:#112e4a}

/* Container */
.container{max-width:1100px;margin:0 auto;padding:0 1.5rem}
section{padding:2rem 0}
.section-head{margin-bottom:1rem;display:flex;justify-content:space-between;align-items:end;flex-wrap:wrap;gap:0.6rem}
.section-head h2{font-family:'Merriweather',serif;font-size:1.35rem;color:var(--navy)}
.section-head h2 em{color:var(--blue);font-style:italic;font-weight:400}
.section-head p{color:var(--muted);font-size:0.85rem}

/* Grids */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.grid-books{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:1rem}

.card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:1.2rem;text-align:center;
}
.card:hover{border-color:var(--gold)}
.card .icon{width:44px;height:44px;margin:0 auto 0.6rem;background:#eef4fa;border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--navy)}
.card .icon svg{width:20px;height:20px}
.card h3{font-size:0.9rem;font-weight:700;color:var(--navy);margin-bottom:0.2rem}
.card p{font-size:0.8rem;color:var(--muted)}

/* Libros */
.book{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;
}
.book-top{height:120px;background:linear-gradient(135deg,var(--navy),var(--blue));display:grid;place-items:center;color:#fff;font-family:'Merriweather',serif;font-weight:700;padding:1rem;text-align:center;border-bottom:3px solid var(--gold);position:relative;overflow:hidden}
.book-top.gold{background:linear-gradient(135deg,#fff8e6,#C9A86A);color:var(--navy)}
.book-top img{width:100%;height:100%;object-fit:cover}
.badge-disponible{position:absolute;top:8px;right:8px;font-size:0.65rem;font-weight:800;padding:0.2rem 0.45rem;border-radius:999px;letter-spacing:0.04em}
.badge-ok{background:#d1fae5;color:#065f46}
.badge-no{background:#fee2e2;color:#991b1b}
.book-body{padding:0.9rem;flex:1;display:flex;flex-direction:column}
.book-body h3{font-size:0.9rem;color:var(--navy);margin-bottom:0.15rem;line-height:1.3}
.book-body p{font-size:0.8rem;color:var(--muted)}
.tag{display:inline-block;margin-top:0.4rem;font-size:0.68rem;font-weight:700;padding:0.2rem 0.5rem;border-radius:999px;background:#eef4fa;color:var(--navy)}
.book-actions{margin-top:0.7rem;display:flex;gap:0.4rem;flex-wrap:wrap}
.btn-sm{padding:0.35rem 0.7rem;border-radius:999px;font-size:0.75rem;font-weight:700;border:1px solid var(--border);cursor:pointer;background:#fff;color:var(--navy)}
.btn-sm.primary{background:var(--navy);color:#fff;border-color:var(--navy)}
.btn-sm.primary:hover{background:#112e4a}
.btn-sm:hover{border-color:var(--navy)}
.btn-sm.danger{color:var(--danger);border-color:#fecaca}
.btn-sm.danger:hover{background:#fef2f2}

/* Tabla */
.table-wrap{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;overflow-x:auto}
table{width:100%;border-collapse:collapse;min-width:640px}
th{background:var(--navy);color:#f3e6c8;font-size:0.7rem;letter-spacing:0.08em;text-transform:uppercase;padding:0.8rem 1rem;text-align:left;border-bottom:2px solid var(--gold);cursor:pointer;user-select:none;white-space:nowrap}
th:hover{color:#fff}
th .sort{margin-left:0.25rem;opacity:0.7;font-size:0.65rem}
td{padding:0.8rem 1rem;font-size:0.88rem;border-bottom:1px solid var(--border)}
tr:hover td{background:#fdfbf6}
tr:last-child td{border-bottom:none}
.pill{font-size:0.7rem;font-weight:700;padding:0.2rem 0.5rem;border-radius:999px}
.pill-ok{background:#d1fae5;color:#065f46}
.pill-no{background:#fee2e2;color:#991b1b}
.actions{display:flex;gap:0.35rem;flex-wrap:wrap}

/* Filtros catalogo */
.filters{display:flex;gap:0.6rem;flex-wrap:wrap;margin-bottom:1rem;align-items:center}
.filters input, .filters select{padding:0.55rem 0.9rem;border:1.5px solid var(--border);border-radius:999px;font-size:0.88rem;outline:none;background:#fff;min-width:160px}
.filters input:focus, .filters select:focus{border-color:var(--blue)}
.filters .searchbar{margin:0;flex:1;min-width:220px}
.pagination{display:flex;gap:0.4rem;align-items:center;justify-content:center;margin-top:1rem;flex-wrap:wrap}
.page-btn{padding:0.45rem 0.85rem;border:1px solid var(--border);background:#fff;border-radius:999px;font-size:0.85rem;cursor:pointer;font-weight:600}
.page-btn.active{background:var(--navy);color:#fff;border-color:var(--navy)}
.page-btn:disabled{opacity:0.4;cursor:not-allowed}
.page-info{font-size:0.85rem;color:var(--muted)}

/* Formularios */
.form-wrap{display:grid;place-items:center;padding:2rem 1rem}
.form-box{width:100%;max-width:420px;background:#fff;border:1px solid var(--border);border-radius:14px;padding:1.6rem;border-top:4px solid var(--navy)}
.form-box.wide{max-width:560px}
.form-box h2{font-family:'Merriweather',serif;color:var(--navy);text-align:center;margin-bottom:0.3rem}
.form-box .sub{color:var(--muted);font-size:0.85rem;text-align:center;margin-bottom:1rem}
.form-box label{display:block;font-size:0.8rem;font-weight:700;color:var(--navy);margin-bottom:0.25rem}
.form-box input, .form-box select, .form-box textarea{width:100%;padding:0.7rem 0.9rem;margin-bottom:0.9rem;border:1.5px solid var(--border);border-radius:8px;font-size:0.92rem;outline:none;background:#fff}
.form-box input:focus, .form-box select:focus, .form-box textarea:focus{border-color:var(--blue)}
.form-box button{width:100%;padding:0.8rem;background:var(--navy);color:#fff;border:none;border-radius:999px;font-weight:700;cursor:pointer}
.form-box button:hover{background:#112e4a}
.form-box button:disabled{opacity:0.6;cursor:not-allowed}
.form-foot{text-align:center;margin-top:0.8rem;font-size:0.85rem;color:var(--muted)}
.form-foot a{color:var(--blue);font-weight:700}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:0.8rem}
.alert{padding:0.7rem 0.9rem;border-radius:8px;font-size:0.85rem;margin-bottom:0.9rem;display:none}
.alert.show{display:block}
.alert.error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.alert.success{background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0}
.alert.info{background:#eff6ff;color:#1e40af;border:1px solid #bfdbfe}

/* Libro detalle */
.detail-grid{display:grid;grid-template-columns:280px 1fr;gap:1.5rem}
.detail-cover{height:340px;background:linear-gradient(135deg,var(--navy),var(--blue));border-radius:12px;display:grid;place-items:center;color:#fff;font-family:'Merriweather',serif;font-weight:700;padding:1rem;text-align:center;border:3px solid var(--gold);overflow:hidden}
.detail-cover.gold{background:linear-gradient(135deg,#fff8e6,#C9A86A);color:var(--navy)}
.detail-cover img{width:100%;height:100%;object-fit:cover;border-radius:8px}
.detail-info h1{font-family:'Merriweather',serif;color:var(--navy);font-size:1.6rem;line-height:1.2}
.detail-meta{color:var(--muted);margin:0.4rem 0 0.8rem}
.detail-desc{background:#fff;border:1px solid var(--border);border-radius:12px;padding:1rem;margin-top:1rem}

/* Toast */
#toastBox{position:fixed;bottom:1.2rem;right:1.2rem;z-index:50;display:flex;flex-direction:column;gap:0.5rem;pointer-events:none}
.toast{background:var(--navy);color:#fff;padding:0.8rem 1rem;border-radius:10px;font-size:0.88rem;box-shadow:0 8px 24px rgba(0,0,0,0.15);border-left:4px solid var(--gold);animation:slideIn 0.25s ease;max-width:360px}
.toast.success{border-left-color:#10b981}
.toast.error{border-left-color:#ef4444}
.toast.info{border-left-color:var(--gold)}
@keyframes slideIn{from{transform:translateX(20px);opacity:0}to{transform:translateX(0);opacity:1}}

/* Modal */
.modal-backdrop{position:fixed;inset:0;background:rgba(11,28,43,0.55);display:none;place-items:center;z-index:40;padding:1rem}
.modal-backdrop.show{display:grid}
.modal{background:#fff;border-radius:14px;padding:1.4rem;max-width:420px;width:100%;border-top:4px solid var(--navy);box-shadow:0 20px 40px rgba(0,0,0,0.2)}
.modal h3{font-family:'Merriweather',serif;color:var(--navy);margin-bottom:0.4rem}
.modal p{color:var(--muted);font-size:0.9rem;margin-bottom:1rem}
.modal-actions{display:flex;gap:0.6rem;justify-content:flex-end}
.modal-actions button{padding:0.55rem 1rem;border-radius:999px;font-weight:700;cursor:pointer;border:1px solid var(--border)}
.modal-actions .confirm{background:var(--danger);color:#fff;border-color:var(--danger)}
.modal-actions .cancel{background:#fff}

/* Loading */
.spinner{width:18px;height:18px;border:2px solid var(--border);border-top-color:var(--navy);border-radius:50%;animation:spin 0.7s linear infinite;display:inline-block;vertical-align:middle}
@keyframes spin{to{transform:rotate(360deg)}}
.loading{color:var(--muted);font-size:0.9rem;display:flex;align-items:center;gap:0.5rem;justify-content:center;padding:1.2rem}
.skeleton{background:linear-gradient(90deg,#eef4fa 25%,#f8fafc 50%,#eef4fa 75%);background-size:200% 100%;animation:skeleton 1.2s infinite}
@keyframes skeleton{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* Footer */
footer{background:var(--navy);color:#cbdde8;text-align:center;padding:1.4rem 1rem;margin-top:2rem;border-top:3px solid var(--gold);font-size:0.85rem}
footer strong{color:var(--gold)}

/* Responsive */
@media(max-width:900px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}.detail-grid{grid-template-columns:1fr}}
@media(max-width:600px){
  header{flex-direction:column;gap:0.6rem;padding:0.8rem 1rem}
  .grid-4,.grid-3{grid-template-columns:1fr}
  .searchbar{flex-direction:column;border-radius:14px}
  .searchbar button{width:100%}
  .form-row{grid-template-columns:1fr}
  .filters{flex-direction:column;align-items:stretch}
  .filters input, .filters select{width:100%}
}