/* ===== Tema Oscuro - Sistema (activado vía [data-theme="dark"] en <html>) ===== */

[data-theme="dark"] body {
    background: #0f172a !important;
    color: #e2e8f0;
}

/* Brand / encabezados */
[data-theme="dark"] .dashboard-header {
    background: linear-gradient(135deg, #113252 0%, #0a1f3a 100%);
    box-shadow: 0 4px 24px rgba(17, 50, 82, 0.5);
}

/* Tarjetas principales - efecto vidrio oscuro */
[data-theme="dark"] .module-card,
[data-theme="dark"] .quick-stat,
[data-theme="dark"] .content-card {
    background: rgba(30, 41, 59, 0.82);
    border: 1px solid rgba(144, 200, 240, 0.12);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    color: #e2e8f0;
}
[data-theme="dark"] .module-card .card-header,
[data-theme="dark"] .content-card .card-header,
[data-theme="dark"] .card-header {
    background: rgba(25, 33, 57, 0.85);
    border-color: rgba(144, 200, 240, 0.12);
    color: #cbd5e1;
}
[data-theme="dark"] .module-card .card-header h6,
[data-theme="dark"] .content-card .card-header h6 {
    color: #93c5fd;
}

/* Bootstrap cards genéricos */
[data-theme="dark"] .card {
    background: #1e293b;
    border-color: #33415b;
    color: #e2e8f0;
}
[data-theme="dark"] .card-body { color: #e2e8f0; }

/* Alerts */
[data-theme="dark"] .alert {
    background: rgba(30, 41, 59, 0.9);
    border-color: #33415b;
    color: #e2e8f0;
}
[data-theme="dark"] .alert-warning {
    background: rgba(111, 66, 0, 0.25);
    color: #fed7aa;
}
[data-theme="dark"] .alert-warning strong { color: #fcd34d; }
[data-theme="dark"] .alert-custom {
    background: rgba(251, 243, 205, 0.1);
    border-left-color: #f59e0b;
}
[data-theme="dark"] .alert-custom strong { color: #fcd34d; }

/* Footer (pie.php) */
[data-theme="dark"] .site-footer {
    background: #1e293b;
    border-top-color: #33415b;
    color: #94a3b8;
}
[data-theme="dark"] .footer-brand,
[data-theme="dark"] .footer-dev,
[data-theme="dark"] .footer-copy {
    color: #e2e8f0;
}
[data-theme="dark"] .footer-dev i { color: var(--ea-navy, #113252); }
[data-theme="dark"] .footer-dev a,
[data-theme="dark"] .footer-copy a {
    color: #93c5fd;
}
[data-theme="dark"] .footer-brand img {
    opacity: 0.95;
    filter: grayscale(0%) brightness(0) invert(1);
}

/* Navbar (menu.php) */
[data-theme="dark"] .navbar-bg {
    background: #1e293b;
    border-color: #33415b;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}
[data-theme="dark"] .navbar-brand-modern {
    color: #f1f5f9 !important;
}
[data-theme="dark"] .navbar-brand-modern img {
    filter: brightness(0) invert(1);
}
[data-theme="dark"] .nav-modern .nav-link {
    color: #cbd5e1 !important;
}
[data-theme="dark"] .nav-modern .nav-link:hover {
    background: rgba(144, 200, 240, 0.1);
    color: #f1f5f9 !important;
}
[data-theme="dark"] .nav-modern .nav-item.active .nav-link {
    background: var(--ea-navy, #113252);
}
[data-theme="dark"] .dropdown-menu-modern {
    background: #1e293b;
    border-color: #33415b;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}
[data-theme="dark"] .dropdown-menu-modern .dropdown-item {
    color: #cbd5e1;
}
[data-theme="dark"] .dropdown-menu-modern .dropdown-item:hover {
    color: #f1f5f9;
}
[data-theme="dark"] .dropdown-header-modern,
[data-theme="dark"] .dropdown-divider-modern {
    border-color: #33415b;
    color: #94a3b8;
}

/* Botones de navegación */
[data-theme="dark"] .btn-nav-secondary {
    background: #33415b;
    color: #e2e8f0;
    border-color: #475870;
}
[data-theme="dark"] .btn-nav-secondary:hover {
    background: #475870;
    color: #f1f5f9;
}
[data-theme="dark"] .btn-nav-danger {
    background: #7f1d1d;
}
[data-theme="dark"] .btn-nav-info {
    background: #157982;
}
[data-theme="dark"] .btn-nav-success {
    background: #047857;
}
[data-theme="dark"] .btn-nav-warning {
    background: #92400e;
}
[data-theme="dark"] .user-badge {
    background: rgba(144, 200, 240, 0.12);
    border-color: #475870;
    color: #cbd5e1;
}
[data-theme="dark"] .user-badge i { color: #4ade80; }

/* Enlaces e iconos */
[data-theme="dark"] a { color: #93c5fd; }
[data-theme="dark"] a:hover { color: #bfdbfe; }
[data-theme="dark"] .text-dark { color: #e2e8f0 !important; }
[data-theme="dark"] .text-warning { color: #fcd34d !important; }
[data-theme="dark"] .text-primary { color: #60a5fa !important; }
[data-theme="dark"] .text-success { color: #4ade80 !important; }
[data-theme="dark"] .text-secondary { color: #94a3b8 !important; }
[data-theme="dark"] .bg-white,
[data-theme="dark"] .bg-light { background: #1e293b !important; }

/* Tablas */
[data-theme="dark"] table,
[data-theme="dark"] .table {
    color: #e2e8f0;
}
[data-theme="dark"] .table thead th,
[data-theme="dark"] table thead th {
    background: #1e293b;
    color: #cbd5e1;
    border-color: #33415b;
}
[data-theme="dark"] .table td,
[data-theme="dark"] .table th,
[data-theme="dark"] table td,
[data-theme="dark"] table th {
    border-color: #33415b;
}
[data-theme="dark"] .table-striped tbody tr:nth-of-type(odd) {
    background: rgba(144, 200, 240, 0.04);
}

/* Formularios */
[data-theme="dark"] input.form-control,
[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] select.form-control,
[data-theme="dark"] textarea.form-control,
[data-theme="dark"] .form-control {
    background: #1e293b;
    color: #e2e8f0;
    border-color: #475870;
}
[data-theme="dark"] .form-control:focus {
    background: #1e293b;
    color: #e2e8f0;
    border-color: var(--ea-navy, #113252);
    box-shadow: 0 0 0 0.2rem rgba(17, 50, 82, 0.4);
}
[data-theme="dark"] ::placeholder { color: #94a3b8; }
[data-theme="dark"] .input-group-text {
    background: #1e293b;
    border-color: #475870;
    color: #cbd5e1;
}

/* Badges */
[data-theme="dark"] .badge {
    filter: saturate(0.85);
}

/* Scrollbars */
[data-theme="dark"] ::-webkit-scrollbar { width: 8px; height: 8px; }
[data-theme="dark"] ::-webkit-scrollbar-track { background: #1e293b; }
[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: #33415b;
    border-radius: 4px;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: #475870;
}

/* ===== Login (index.php) ===== */
[data-theme="dark"] .login-wrapper {
    background: #0f172a !important;
}
[data-theme="dark"] form[role=login] {
    background: rgba(30, 41, 59, 0.9);
    border-color: rgba(144, 200, 240, 0.12);
    color: #e2e8f0;
}
[data-theme="dark"] form[role=login]::before {
    background: linear-gradient(90deg, #4f7cff, #2a4fd8);
}
[data-theme="dark"] .login-form input[type="text"],
[data-theme="dark"] .login-form input[type="password"],
[data-theme="dark"] .login-form .form-control {
    background: #1e293b;
    color: #e2e8f0;
    border-color: #475870;
}
[data-theme="dark"] .login-footer { color: #94a3b8; }
[data-theme="dark"] .login-footer a { color: #93c5fd; }

/* Footer institucional - icono de desarrollador visible en oscuro */
[data-theme="dark"] .footer-dev i { color: #60a5fd; }
[data-theme="dark"] .footer-brand img { filter: brightness(0) invert(1) grayscale(0%) !important; }

/* Listas Libros / Articulos solicitados */
[data-theme="dark"] .book-item dt,
[data-theme="dark"] .equipo-item dt {
    color: #e2e8f0;
}
[data-theme="dark"] .book-item dd,
[data-theme="dark"] .equipo-item dd {
    color: #94a3b8;
}
[data-theme="dark"] .book-item,
[data-theme="dark"] .equipo-item {
    border-bottom-color: rgba(144, 200, 240, 0.12);
}