/* ============================================================
   BIBLIOTECA FLASK22 — SISTEMA DE DISEÑO SENA DARK GLASS
   Dark Premium & Glassmorphism | v4.0 | 2026
   ============================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Work+Sans:wght@300;400;500;600;700&display=swap');

/* ── Design Tokens ── */
:root {
  /* Paleta SENA Oficial adaptada a Dark Mode */
  --sena-green:       #5eb319; /* Verde Clásico SENA Luminoso */
  --sena-green-dark:  #39A900; /* Verde Medio */
  --sena-orange:      #FC7323; /* Naranja SENA */
  
  /* Glassmorphism Dark Theme Defaults */
  --bg-base:       #0D1117; /* GitHub Dark style base */
  --bg-surface:    rgba(255, 255, 255, 0.04); /* Tarjetas Glaseadas */
  --bg-elevated:   rgba(255, 255, 255, 0.07);
  --bg-hover:      rgba(255, 255, 255, 0.09);

  /* Mapping legacy variables */
  --accent-cyan:   #39A900; 
  --accent-cyan-glow: rgba(57, 169, 0, 0.15);
  --accent-green:  #5eb319;
  --accent-green-glow: rgba(94, 179, 25, 0.15);
  --accent-amber:  #FC7323;
  --accent-red:    #F85149;
  --accent-red-glow:  rgba(248, 81, 73, 0.15);
  --accent-purple: #8957E5; /* Keep some purple for variety if needed */

  /* Textos contrastantes para Dark Mode */
  --text-primary:  #F0F6FC;
  --text-secondary:#C9D1D9;
  --text-muted:    #8B949E;
  --text-disabled: #484F58;

  /* Borders / Glass Strokes */
  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-default:rgba(255, 255, 255, 0.1);
  --border-muted:  rgba(255, 255, 255, 0.15);
  --border-glow:   rgba(57, 169, 0, 0.5);

  /* Shadows (Profundidad Oscura) */
  --shadow-sm:  0 4px 6px -1px rgba(0,0,0,0.5);
  --shadow-md:  0 8px 15px -3px rgba(0,0,0,0.6);
  --shadow-lg:  0 20px 30px rgba(0,0,0,0.8);
  --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

  /* Radius */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  16px;
  --radius-xl:  24px;

  /* Transitions */
  --trans-fast: 150ms ease-in-out;
  --trans-base: 250ms ease-in-out;
  --trans-slow: 350ms ease;

  /* Typography */
  --font-sans:  'Work Sans', 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono:  'Courier New', Courier, monospace;
}

/* ── Base Reset ── */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body.biblioteca-body {
  font-family: var(--font-sans);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-base);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--border-default); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--sena-green); }

/* ── Selection ── */
::selection { background: var(--sena-green); color: #FFF; }

/* ============================================================
   NAVBAR — Dark Glassmorphism SENA
   ============================================================ */
.biblioteca-nav {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: rgba(13, 17, 23, 0.7) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-default);
  padding: 0.6rem 1.25rem;
  box-shadow: var(--shadow-sm);
}

.biblioteca-nav .navbar-brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: #FFF !important;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: opacity var(--trans-fast);
}

.biblioteca-nav .navbar-brand:hover { opacity: 0.8; text-shadow: 0 0 10px var(--sena-green-dark); }

.biblioteca-nav .navbar-brand .brand-icon {
  color: var(--sena-green);
  font-size: 1.5rem;
  filter: drop-shadow(0 0 5px var(--sena-green-dark));
}

.biblioteca-nav .nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.5rem 0.9rem !important;
  border-radius: var(--radius-sm);
  transition: all var(--trans-fast);
  position: relative;
}

.biblioteca-nav .nav-link:hover,
.biblioteca-nav .nav-link.active {
  color: #FFF !important;
  background: var(--bg-hover);
}

.biblioteca-nav .nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 25px;
  height: 3px;
  background: var(--sena-green);
  border-radius: 99px 99px 0 0;
  box-shadow: 0 0 8px var(--sena-green);
}

/* Dropdown */
.biblioteca-nav .dropdown-menu {
  background: rgba(22, 27, 34, 0.85) !important;
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-default) !important;
  border-radius: var(--radius-md) !important;
  box-shadow: var(--shadow-glass) !important;
  padding: 0.5rem !important;
  min-width: 180px;
  animation: dropIn 0.2s ease;
}

@keyframes dropIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.biblioteca-nav .dropdown-item {
  color: var(--text-primary) !important;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm) !important;
  padding: 0.5rem 0.8rem !important;
  transition: background var(--trans-fast), color var(--trans-fast);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.biblioteca-nav .dropdown-item:hover {
  background: var(--bg-hover) !important;
  color: var(--sena-green) !important;
}

.biblioteca-nav .navbar-toggler {
  border-color: var(--border-default) !important;
  padding: 4px 8px;
}
.biblioteca-nav .navbar-toggler-icon {
  filter: invert(1);
}

/* Nav badge / avatar pill */
.nav-user-pill {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: 99px;
  padding: 4px 16px 4px 4px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--trans-fast);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}
.nav-user-pill:hover {
  border-color: var(--sena-green);
  background: var(--bg-hover);
  color: #FFF;
}
.nav-user-pill .avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--sena-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #111;
}

/* ============================================================
   GLOBAL BACKGROUND FOR APP (Subtle abstract grid)
   ============================================================ */
body.biblioteca-body {
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(57, 169, 0, 0.05), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(252, 115, 35, 0.03), transparent 25%);
  background-attachment: fixed;
}


/* ============================================================
   PAGE WRAPPER & CARD SHELL & WATERMARK (Glassmorphism)
   ============================================================ */
.biblioteca-shell {
  background: var(--bg-surface);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glass);
  position: relative;
  overflow: hidden;
  transition: border-color var(--trans-base);
}

.biblioteca-shell::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  height: 90%;
  background-image: url('https://upload.wikimedia.org/wikipedia/commons/8/83/Sena_Colombia_logo.svg');
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.03; /* Extremely subtle in dark mode */
  pointer-events: none;
  z-index: 0;
  filter: grayscale(100%) brightness(200%); /* Make it white-ish so it shows up slightly */
}

.biblioteca-shell:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.biblioteca-shell-header {
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border-default);
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  position: relative;
  z-index: 1;
}

.biblioteca-shell-header h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #FFF;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.shell-header-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sena-green);
  font-size: 1.1rem;
}

.biblioteca-shell-body {
  padding: 1.5rem;
  background: transparent;
  position: relative;
  z-index: 1;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: var(--radius-md);
  transition: all var(--trans-fast);
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--sena-green-dark) 0%, #206100 100%) !important;
  border: 1px solid var(--sena-green) !important;
  color: #fff !important;
  box-shadow: 0 4px 15px rgba(57,169,0,0.3);
}
.btn-primary:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(57,169,0,0.4);
}

.btn-success {
  background: var(--sena-green) !important;
  border: 1px solid #75D822 !important;
  color: #111 !important;
  box-shadow: 0 4px 15px rgba(94,179,25,0.3);
}
.btn-success:hover {
  background: #6DCE1D !important;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(94,179,25,0.5);
}

.btn-danger {
  background: rgba(217, 48, 37, 0.2) !important;
  border: 1px solid rgba(217, 48, 37, 0.5) !important;
  color: #FF7B72 !important;
}
.btn-danger:hover {
  background: rgba(217, 48, 37, 0.4) !important;
  color: #FFF !important;
}

.btn-secondary {
  background: var(--bg-hover) !important;
  border: 1px solid var(--border-default) !important;
  color: var(--text-primary) !important;
}
.btn-secondary:hover {
  background: var(--border-muted) !important;
  color: #FFF !important;
}

.btn-info {
  background: linear-gradient(135deg, var(--sena-orange) 0%, #C4510D 100%) !important;
  border: 1px solid var(--sena-orange) !important;
  color: #fff !important;
  box-shadow: 0 4px 15px rgba(252,115,35,0.3);
}
.btn-info:hover {
  filter: brightness(1.15);
  transform: translateY(-1px);
}

/* Outline ghost variant (Legacy Support) */
.btn-ghost {
  background: rgba(255,255,255,0.03) !important;
  border: 1px solid var(--border-default) !important;
  color: var(--sena-green) !important;
  backdrop-filter: blur(4px);
}
.btn-ghost:hover {
  border-color: var(--sena-green) !important;
  color: #111 !important;
  background: var(--sena-green) !important;
  box-shadow: 0 0 10px rgba(57,169,0,0.4);
}

.btn-outline-secondary {
  color: var(--text-secondary) !important;
  border-color: var(--border-default) !important;
}
.btn-outline-secondary:hover {
  background: var(--border-default) !important;
  color: #FFF !important;
}


/* ============================================================
   FORMS (Dark Glass)
   ============================================================ */
.form-control, .form-select {
  background: rgba(0, 0, 0, 0.3) !important;
  border: 1px solid var(--border-default) !important;
  color: #FFF !important;
  border-radius: var(--radius-sm) !important;
  font-family: var(--font-sans) !important;
  font-size: 0.9rem !important;
  padding: 0.6rem 0.9rem !important;
  transition: border-color var(--trans-base), box-shadow var(--trans-base), background var(--trans-base) !important;
}

/* Fix dropdown options readability in dark mode */
.form-select option {
  background-color: var(--bg-base);
  color: #FFF;
}

.form-control:focus, .form-select:focus {
  border-color: var(--sena-green) !important;
  box-shadow: 0 0 0 3px rgba(57,169,0,0.2) !important;
  background: rgba(0, 0, 0, 0.5) !important;
  outline: none !important;
}

.form-control::placeholder { color: var(--text-disabled) !important; }

.form-label {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

/* Input with icon wrapper */
.input-icon-wrap {
  position: relative;
}
.input-icon-wrap .bi {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 1rem;
  z-index: 5;
}
.input-icon-wrap .form-control {
  padding-left: 2.5rem !important;
}

/* ============================================================
   TABLE — Dark Clean
   ============================================================ */
.biblioteca-table, .table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.9rem;
  color: var(--text-primary) !important;
  background-color: transparent !important;
  --bs-table-bg: transparent !important;
  --bs-table-color: var(--text-primary) !important;
  --bs-table-striped-bg: transparent !important;
}

.table > :not(caption) > * > * {
  background-color: transparent !important;
  border-bottom-color: var(--border-subtle) !important;
}

.table-hover tbody tr:hover > * {
  background: var(--bg-hover) !important;
  color: #FFF !important;
}

.biblioteca-table thead tr, .table-light, .table-light > th, .table-light > td {
  background-color: rgba(255, 255, 255, 0.05) !important;
  --bs-table-bg: rgba(255, 255, 255, 0.05) !important;
  color: var(--text-secondary) !important;
}

.biblioteca-table thead th, .table-light th {
  color: var(--text-muted) !important;
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.85rem 1rem;
  white-space: nowrap;
  border-bottom: 2px solid var(--border-default) !important;
  border-top: none !important;
}

.biblioteca-table tbody tr, .table tbody tr {
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--trans-fast);
}

.biblioteca-table tbody td, .table tbody td {
  color: var(--text-secondary);
  padding: 0.85rem 1rem;
  vertical-align: middle;
  border-bottom: 1px solid var(--border-subtle) !important;
  background-color: transparent !important;
}

.biblioteca-table tbody td:first-child, .table tbody td:first-child {
  color: var(--text-primary);
  font-weight: 500;
}

.tabla-acciones {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

/* ============================================================
   BADGES (Neon Glass Style)
   ============================================================ */
.badge-lib {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.badge-cyan   { background: rgba(57,169,0,0.1); color: #75D822; border: 1px solid rgba(57,169,0,0.3); text-shadow: 0 0 5px rgba(117,216,34,0.3);} 
.badge-green  { background: rgba(57,169,0,0.15); color: #9BFF4D; border: 1px solid rgba(57,169,0,0.4); text-shadow: 0 0 5px rgba(155,255,77,0.3);}
.badge-red    { background: rgba(248,81,73,0.1); color: #FF7B72; border: 1px solid rgba(248,81,73,0.3); }
.badge-amber  { background: rgba(252,115,35,0.1); color: #FFA657; border: 1px solid rgba(252,115,35,0.3); }
.badge-gray   { background: rgba(255,255,255,0.05); color: var(--text-secondary); border: 1px solid var(--border-default); }
.badge-blue   { background: rgba(88,166,255,0.1); color: #79C0FF; border: 1px solid rgba(88,166,255,0.3); }

/* ============================================================
   MODALS — Dark Glass
   ============================================================ */
.modal-content {
  background: rgba(22, 27, 34, 0.95) !important;
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-default) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.05) inset !important;
  color: var(--text-primary) !important;
}

.modal-header {
  border-bottom: 1px solid var(--border-default) !important;
  background: transparent !important;
  padding: 1.25rem 1.5rem !important;
}

.modal-title {
  font-size: 1.1rem !important;
  font-weight: 700 !important;
  color: #FFF !important;
}

.modal-body {
  padding: 1.5rem !important;
}

.modal-footer {
  border-top: 1px solid var(--border-default) !important;
  background: rgba(0, 0, 0, 0.2) !important;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg) !important;
  padding: 1rem 1.5rem !important;
}

.btn-close {
  filter: invert(1) opacity(0.5); /* Make close button white */
}
.btn-close:hover { filter: invert(1) opacity(1); }

.modal-backdrop { backdrop-filter: blur(5px); background-color: rgba(0,0,0,0.6); }

/* ============================================================
   ALERTS / FLASH MESSAGES
   ============================================================ */
.flash-message {
  border-radius: var(--radius-md) !important;
  border: 1px solid !important;
  font-size: 0.9rem;
  font-weight: 500;
  backdrop-filter: blur(10px);
  animation: slideInAlert 0.3s ease;
  box-shadow: var(--shadow-glass);
}

@keyframes slideInAlert {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.alert-success {
  background: rgba(57,169,0,0.1) !important;
  border-color: rgba(57,169,0,0.3) !important;
  color: #9BFF4D !important;
}
.alert-danger {
  background: rgba(248,81,73,0.1) !important;
  border-color: rgba(248,81,73,0.3) !important;
  color: #FF7B72 !important;
}
.alert-warning {
  background: rgba(252,115,35,0.1) !important;
  border-color: rgba(252,115,35,0.3) !important;
  color: #FFA657 !important;
}
.alert-info {
  background: rgba(255,255,255,0.05) !important;
  border-color: var(--border-default) !important;
  color: var(--text-primary) !important;
}

/* ============================================================
   FOOTER
   ============================================================ */
.biblioteca-footer {
  background: rgba(13, 17, 23, 0.8) !important;
  backdrop-filter: blur(10px);
  border-top: 2px solid var(--sena-green);
  padding: 1.5rem 0;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted) !important;
}

.biblioteca-footer a {
  color: var(--sena-green) !important;
  text-decoration: none;
  font-weight: 600;
  transition: opacity var(--trans-fast);
}
.biblioteca-footer a:hover { opacity: 0.75; text-decoration: underline; text-shadow: 0 0 5px var(--sena-green); }

/* ============================================================
   LOGIN PAGE — DARK GLASSMORPHISM SENA
   ============================================================ */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 2rem;
  z-index: 1;
  /* EPIC BACKGROUND: SENA style tech facilities via unsplash with dark green overlay */
  background: 
    linear-gradient(135deg, rgba(8, 12, 18, 0.95) 0%, rgba(0, 80, 20, 0.75) 100%),
    url('https://images.unsplash.com/photo-1497215728101-856f4ea42174?auto=format&fit=crop&q=80&w=1920') center/cover no-repeat fixed;
}

.login-card {
  width: 100%;
  max-width: 420px;
  background: rgba(20, 25, 30, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6), inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  overflow: hidden;
  animation: loginEntrance 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes loginEntrance {
  from { opacity: 0; transform: translateY(30px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.login-card-header {
  padding: 2rem 2rem 1.5rem;
  text-align: center;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.login-logo {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.9);
  border: 2px solid var(--sena-green);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  font-size: 1.8rem;
  color: var(--sena-orange);
  box-shadow: 0 0 20px rgba(57, 169, 0, 0.6);
  padding: 6px;
}

/* Custom image inject for logo if wanted instead of icon:
   .login-logo { background-image: url('svg...'); background-size: cover; } */
.login-logo-img { width: 100%; height: 100%; object-fit: contain; }

.login-card-header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #FFF;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 5px rgba(0,0,0,0.5);
}

.login-card-header p {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin: 0.5rem 0 0;
}

.login-card-body {
  padding: 2rem;
}

/* ============================================================
   SEARCH BAR
   ============================================================ */
.search-bar-wrap {
  position: relative;
  flex: 1;
}
.search-bar-wrap .search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
}
.search-bar-wrap input {
  padding-left: 2.6rem !important;
}

/* ============================================================
   PAGE HEADER TOOLBAR
   ============================================================ */
.page-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
  background: var(--bg-surface);
  backdrop-filter: blur(10px);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-sm);
}
.page-toolbar h2 {
  color: #FFF;
}

.toolbar-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ============================================================
   CARD — Generic Clean Card
   ============================================================ */
.lib-card {
  background: var(--bg-surface);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--trans-base), transform var(--trans-fast), border-color var(--trans-base);
}
.lib-card:hover {
  box-shadow: var(--shadow-md), 0 0 15px rgba(255,255,255,0.05);
  transform: translateY(-2px);
  border-color: var(--border-muted);
}
.lib-card-body { padding: 1.5rem; }
.lib-card-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

/* ============================================================
   DIVIDER
   ============================================================ */
.lib-divider {
  height: 1px;
  background: var(--border-default);
  margin: 1.25rem 0;
}

/* ============================================================
   EMPTY STATE
   ============================================================ */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
}
.empty-state i {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.3;
  display: block;
}
.empty-state p {
  font-size: 0.9rem;
  font-weight: 500;
  margin: 0;
}
.empty-state h5 {
  color: var(--sena-green);
  font-weight: 700;
}

/* ============================================================
   UTILITY OVERRIDES
   ============================================================ */
.text-muted   { color: var(--text-muted) !important; }
.text-primary { color: var(--sena-green) !important; }
.text-success { color: #9BFF4D !important; }
.text-danger  { color: #FF7B72 !important; }
.bg-dark      { background: rgba(0,0,0,0.3) !important; }
.bg-light     { background: rgba(255,255,255,0.02) !important; border: 1px solid var(--border-default); }
.border       { border-color: var(--border-default) !important; }

/* Password dots using monospace */
.pw-mask {
  font-family: var(--font-mono);
  letter-spacing: 0.15em;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: bolder;
}

/* Fecha / timestamp label */
.ts-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  background: rgba(255,255,255,0.05);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Utilidad especial de Sena Text */
.text-sena-green {
  color: var(--sena-green) !important;
  text-shadow: 0 0 8px rgba(94, 179, 25, 0.4);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .biblioteca-shell-body { padding: 1rem; }
  .login-card-header, .login-card-body { padding-left: 1.25rem; padding-right: 1.25rem; }
  .page-toolbar { flex-direction: column; align-items: stretch; text-align: center;}
  .toolbar-actions { justify-content: center; }
  .biblioteca-table thead { display: none; }
  .table thead { display: none; } /* override for bootstrap generic table */
  
  .biblioteca-table tbody tr, .table tbody tr {
    display: block;
    padding: 1rem;
    border-bottom: 2px solid var(--border-default);
  }
  .biblioteca-table tbody td, .table tbody td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.35rem 0;
    border: none !important;
  }
  .biblioteca-table tbody td::before, .table tbody td::before {
    content: attr(data-label);
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
  }
}