/* ============================================================
   STYLE.CSS - PSEIT Portal Educativo
   Paleta moderna: Índigo + Cian — modo claro y oscuro corregido
   ============================================================ */

/* ============================================================
   VARIABLES GLOBALES
   ============================================================ */
:root {
  --primary:        #357B89;   /* Teal institucional Uniguajira */
  --primary-dark:   #2a6270;   /* Teal profundo */
  --primary-light:  #5aa4b4;   /* Teal claro */
  --accent:         #E9A74E;   /* Dorado institucional Uniguajira */
  --accent-dark:    #d4913a;
  --success:        #10b981;   /* Esmeralda */
  --error:          #ef4444;   /* Rojo */
  --warning:        #f59e0b;   /* Ámbar */

  --bg:             #f0f7f9;   /* Fondo claro teal */
  --bg-card:        #ffffff;
  --text:           #1a3d45;   /* Teal oscuro */
  --text-muted:     #5a9aaa;   /* Muted teal */
  --border:         #b8d8e0;

  --dark-bg:        #0d1117;
  --dark-bg2:       #0f1623;
  --dark-card:      #161b22;
  --dark-card2:     #1c2333;
  --dark-text:      #e6edf3;
  --dark-muted:     #8b949e;
  --dark-border:    #30363d;

  --border-radius:  12px;
  --border-radius-sm: 8px;
  --shadow:         0 2px 16px rgba(53,123,137,0.10);
  --shadow-hover:   0 8px 32px rgba(53,123,137,0.20);
  --transition:     all 0.22s cubic-bezier(0.4,0,0.2,1);
}

/* ============================================================
   BASE
   ============================================================ */
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  transition: background-color 0.3s, color 0.3s;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   MODO OSCURO — Variables de nivel raíz
   ============================================================ */
body.dark-mode {
  background-color: var(--dark-bg);
  color: var(--dark-text);
  color-scheme: dark;
}

/* --- Navbar --- */
body.dark-mode .navbar {
  background: linear-gradient(135deg, #1e1b4b 0%, #0f1623 100%) !important;
  box-shadow: 0 2px 16px rgba(0,0,0,0.5);
  border-bottom: 1px solid var(--dark-border);
}

/* --- Cards --- */
body.dark-mode .card {
  background-color: var(--dark-card);
  border: 1px solid var(--dark-border);
  color: var(--dark-text);
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
}

body.dark-mode .card-header {
  background-color: var(--dark-card2);
  border-bottom: 1px solid var(--dark-border);
  color: var(--dark-text);
}

body.dark-mode .card-footer {
  background-color: var(--dark-card2);
  border-top: 1px solid var(--dark-border);
  color: var(--dark-text);
}

/* --- Formularios --- */
body.dark-mode .form-control,
body.dark-mode .form-select,
body.dark-mode .form-check-input {
  background-color: var(--dark-card2);
  border: 1px solid var(--dark-border);
  color: var(--dark-text);
}

body.dark-mode .form-control:focus,
body.dark-mode .form-select:focus {
  background-color: var(--dark-card2);
  border-color: var(--primary-light);
  color: var(--dark-text);
  box-shadow: 0 0 0 3px rgba(129,140,248,0.2);
}

body.dark-mode .form-control::placeholder {
  color: var(--dark-muted);
}

body.dark-mode .form-label,
body.dark-mode .form-text,
body.dark-mode label {
  color: var(--dark-text);
}

/* --- Textos muted --- */
body.dark-mode .text-muted {
  color: var(--dark-muted) !important;
}

/* --- Tablas --- */
body.dark-mode .table {
  color: var(--dark-text);
  border-color: var(--dark-border);
}

body.dark-mode .table th,
body.dark-mode .table td {
  border-color: var(--dark-border);
  color: var(--dark-text);
}

body.dark-mode .table-striped > tbody > tr:nth-of-type(odd) > * {
  background-color: rgba(255,255,255,0.03);
  color: var(--dark-text);
}

body.dark-mode .table-hover > tbody > tr:hover > * {
  background-color: rgba(129,140,248,0.08);
  color: var(--dark-text);
}

/* --- Modales --- */
body.dark-mode .modal-content {
  background-color: var(--dark-card);
  border: 1px solid var(--dark-border);
  color: var(--dark-text);
}

body.dark-mode .modal-header {
  border-bottom: 1px solid var(--dark-border);
}

body.dark-mode .modal-footer {
  border-top: 1px solid var(--dark-border);
}

body.dark-mode .modal-body {
  color: var(--dark-text);
}

/* --- Botones outline en dark --- */
body.dark-mode .btn-outline-secondary {
  color: var(--dark-muted);
  border-color: var(--dark-border);
}

body.dark-mode .btn-outline-secondary:hover {
  background-color: var(--dark-card2);
  color: var(--dark-text);
}

body.dark-mode .btn-outline-danger {
  color: #f87171;
  border-color: #f87171;
}

body.dark-mode .btn-outline-primary {
  color: var(--primary-light);
  border-color: var(--primary-light);
}

body.dark-mode .btn-outline-success {
  color: #34d399;
  border-color: #34d399;
}

body.dark-mode .btn-outline-warning {
  color: #fbbf24;
  border-color: #fbbf24;
}

body.dark-mode .btn-outline-info {
  color: var(--accent);
  border-color: var(--accent);
}

/* --- Alerts en dark --- */
body.dark-mode .alert-info {
  background-color: rgba(6,182,212,0.12);
  border-color: rgba(6,182,212,0.3);
  color: #67e8f9;
}

body.dark-mode .alert-warning {
  background-color: rgba(245,158,11,0.12);
  border-color: rgba(245,158,11,0.3);
  color: #fcd34d;
}

body.dark-mode .alert-danger {
  background-color: rgba(239,68,68,0.12);
  border-color: rgba(239,68,68,0.3);
  color: #fca5a5;
}

body.dark-mode .alert-success {
  background-color: rgba(16,185,129,0.12);
  border-color: rgba(16,185,129,0.3);
  color: #6ee7b7;
}

/* --- Accordion --- */
body.dark-mode .accordion-button {
  background-color: var(--dark-card2);
  color: var(--dark-text);
  border-color: var(--dark-border);
}

body.dark-mode .accordion-button:not(.collapsed) {
  background-color: rgba(79,70,229,0.25);
  color: var(--primary-light);
}

body.dark-mode .accordion-button::after {
  filter: invert(1) brightness(2);
}

body.dark-mode .accordion-body {
  background-color: var(--dark-card);
  color: var(--dark-text);
  border-color: var(--dark-border);
}

body.dark-mode .accordion-item {
  background-color: var(--dark-card);
  border-color: var(--dark-border);
}

/* --- Nav tabs --- */
body.dark-mode .nav-tabs {
  border-bottom-color: var(--dark-border);
}

body.dark-mode .nav-tabs .nav-link {
  color: var(--dark-muted) !important;
}

body.dark-mode .nav-tabs .nav-link:hover {
  color: var(--dark-text) !important;
  background-color: rgba(129,140,248,0.1);
  border-color: transparent;
}

body.dark-mode .nav-tabs .nav-link.active {
  background-color: var(--dark-card);
  border-color: var(--dark-border) var(--dark-border) var(--dark-card);
  border-bottom: 2px solid var(--primary-light);
  color: var(--primary-light) !important;
}

/* --- Dropdowns --- */
body.dark-mode .dropdown-menu {
  background-color: var(--dark-card2);
  border-color: var(--dark-border);
}

body.dark-mode .dropdown-item {
  color: var(--dark-text);
}

body.dark-mode .dropdown-item:hover {
  background-color: rgba(129,140,248,0.1);
  color: var(--primary-light);
}

/* --- Badges Bootstrap --- */
body.dark-mode .badge.bg-light {
  background-color: var(--dark-card2) !important;
  color: var(--dark-text) !important;
}

body.dark-mode .badge.bg-secondary {
  background-color: #374151 !important;
}

/* --- Sidebar --- */
body.dark-mode .sidebar {
  background-color: var(--dark-card);
  border: 1px solid var(--dark-border);
}

body.dark-mode .sidebar-item {
  color: var(--dark-text);
}

body.dark-mode .sidebar-item:hover {
  background-color: rgba(129,140,248,0.1);
  border-left-color: var(--primary-light);
  color: var(--primary-light);
}

body.dark-mode .sidebar-item.active {
  background-color: rgba(79,70,229,0.2);
  border-left-color: var(--primary-light);
  color: var(--primary-light);
}

body.dark-mode .sidebar-titulo-grupo {
  color: var(--primary-light);
}

/* --- Busqueda sidebar --- */
body.dark-mode .busqueda-sidebar {
  background-color: var(--dark-card2);
  border-color: var(--dark-border);
  color: var(--dark-text);
}

/* --- Opciones quiz --- */
body.dark-mode .opcion-quiz {
  background-color: var(--dark-card2);
  border: 2px solid var(--dark-border);
  color: var(--dark-text);
}

body.dark-mode .opcion-quiz:hover:not(:disabled) {
  background-color: rgba(79,70,229,0.15);
  border-color: var(--primary-light);
  color: var(--dark-text);
}

body.dark-mode .opcion-quiz.seleccionada {
  background-color: rgba(79,70,229,0.2);
  border-color: var(--primary-light);
  color: var(--dark-text);
}

body.dark-mode .opcion-quiz.correcta {
  background-color: rgba(16,185,129,0.15);
  border-color: var(--success);
  color: #6ee7b7;
}

body.dark-mode .opcion-quiz.incorrecta {
  background-color: rgba(239,68,68,0.15);
  border-color: var(--error);
  color: #fca5a5;
}

body.dark-mode .opcion-quiz-check {
  background-color: var(--dark-card2);
  border-color: var(--dark-border) !important;
  color: var(--dark-text);
}

body.dark-mode .opcion-quiz-check.seleccionada {
  background-color: rgba(79,70,229,0.2);
  border-color: var(--primary-light) !important;
}

/* --- Hero --- */
body.dark-mode .hero-section {
  background: linear-gradient(-45deg, #0d1117, #1e1b4b, #0f1623, #1a0a3b) !important;
  background-size: 400% !important;
  animation: heroGradDark 10s ease infinite !important;
}

@keyframes heroGradDark {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* --- Pre/code dark --- */
body.dark-mode pre {
  background-color: #21252b !important;
  color: #abb2bf !important;
  border-color: #3e4451 !important;
}

/* --- Tip box dark --- */
body.dark-mode .tip-box {
  background-color: rgba(245,158,11,0.08);
  border-left-color: var(--warning);
  color: #fcd34d;
}

body.dark-mode .tip-box strong {
  color: #fbbf24;
}

/* --- Revision items --- */
body.dark-mode .revision-item {
  background-color: var(--dark-card);
  border-color: var(--dark-border);
  color: var(--dark-text);
}

body.dark-mode .revision-explicacion {
  background-color: var(--dark-card2);
  color: #94a3b8;
}

/* --- Card tipo quiz --- */
body.dark-mode .card-tipo-quiz {
  border-color: var(--dark-border);
}

body.dark-mode .card-tipo-quiz:hover {
  border-color: var(--primary-light);
  background-color: rgba(79,70,229,0.06);
}

body.dark-mode .card-tipo-quiz.seleccionado {
  background-color: rgba(79,70,229,0.15);
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(129,140,248,0.2);
}

/* --- Tabla resultados dark --- */
body.dark-mode .tabla-resultados tbody tr:hover {
  background-color: rgba(129,140,248,0.08);
}

body.dark-mode .tabla-resultados tbody td {
  border-bottom-color: var(--dark-border);
  color: var(--dark-text);
}

/* --- Card stat dark --- */
body.dark-mode .card-stat .stat-valor { color: var(--primary-light); }
body.dark-mode .card-stat .stat-label { color: var(--dark-muted); }

/* --- Icono vacío dark --- */
body.dark-mode .icono-vacio { color: #30363d; }

/* --- Barra progreso dark --- */
body.dark-mode .barra-progreso-quiz {
  background-color: var(--dark-card2);
}

/* --- Timer dark --- */
body.dark-mode #timer-display {
  background-color: rgba(79,70,229,0.15);
  border-color: rgba(129,140,248,0.3);
  color: var(--primary-light);
}

/* --- Footer dark --- */
body.dark-mode footer {
  background: linear-gradient(135deg, #0a0d1a 0%, #0d1117 100%);
  color: rgba(230,237,243,0.6);
  border-top-color: var(--primary);
}

/* --- Dots dark --- */
body.dark-mode .dot-pregunta {
  background-color: var(--dark-border);
}

body.dark-mode .dot-pregunta.respondida {
  background-color: var(--primary-light);
}

/* --- Errores lista dark --- */
body.dark-mode .errores-lista li {
  border-bottom-color: var(--dark-border);
  color: #fca5a5;
}

/* --- Code inline dark --- */
body.dark-mode code:not(pre code) {
  background-color: rgba(129,140,248,0.15);
  color: var(--primary-light);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

/* --- Headings dark --- */
body.dark-mode h1, body.dark-mode h2, body.dark-mode h3,
body.dark-mode h4, body.dark-mode h5, body.dark-mode h6 {
  color: var(--dark-text);
}

/* --- Bootstrap text utilities dark --- */
body.dark-mode .text-dark  { color: var(--dark-text)   !important; }
body.dark-mode .text-muted { color: var(--dark-muted)  !important; }
body.dark-mode .text-body  { color: var(--dark-text)   !important; }

/* --- Bootstrap bg utilities dark --- */
body.dark-mode .bg-white { background-color: var(--dark-card)  !important; color: var(--dark-text) !important; }
body.dark-mode .bg-light { background-color: var(--dark-card2) !important; color: var(--dark-text) !important; }

/* --- Paragraphs & strong dark --- */
body.dark-mode p      { color: var(--dark-text); }
body.dark-mode strong { color: var(--dark-text); }
body.dark-mode small  { color: var(--dark-muted); }
body.dark-mode label  { color: var(--dark-text); }
body.dark-mode li     { color: var(--dark-text); }

/* --- input-group-text dark --- */
body.dark-mode .input-group-text {
  background-color: var(--dark-card2);
  border-color: var(--dark-border);
  color: var(--dark-muted);
}

/* --- list-group dark --- */
body.dark-mode .list-group-item {
  background-color: var(--dark-card);
  border-color: var(--dark-border);
  color: var(--dark-text);
}
body.dark-mode .list-group-item:hover {
  background-color: var(--dark-card2);
}
body.dark-mode .list-group-item.active {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* --- HR dark --- */
body.dark-mode hr {
  border-color: var(--dark-border);
  opacity: 1;
}

/* --- section-features dark --- */
body.dark-mode .section-features {
  background: #0c1220 !important;
}

/* --- asig-card-header dark --- */
body.dark-mode .asig-card-header {
  background: linear-gradient(135deg, var(--dark-card2) 0%, #141e30 100%) !important;
  color: var(--dark-text) !important;
}

/* --- btn-close dark --- */
body.dark-mode .btn-close {
  filter: invert(1) brightness(1.8);
}

/* --- Border utilities dark --- */
body.dark-mode .border         { border-color: var(--dark-border) !important; }
body.dark-mode .border-top     { border-top-color: var(--dark-border) !important; }
body.dark-mode .border-bottom  { border-bottom-color: var(--dark-border) !important; }
body.dark-mode .border-start   { border-left-color: var(--dark-border) !important; }
body.dark-mode .border-end     { border-right-color: var(--dark-border) !important; }

/* --- select option dark --- */
body.dark-mode select option {
  background: var(--dark-card2);
  color: var(--dark-text);
}

/* --- Pagination dark --- */
body.dark-mode .page-item .page-link {
  background-color: var(--dark-card);
  border-color: var(--dark-border);
  color: var(--primary-light);
}
body.dark-mode .page-item .page-link:hover {
  background-color: var(--dark-card2);
  color: #fff;
}
body.dark-mode .page-item.active .page-link {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
body.dark-mode .page-item.disabled .page-link {
  background-color: var(--dark-card2);
  color: var(--dark-muted);
}

/* --- Progress dark --- */
body.dark-mode .progress {
  background-color: var(--dark-card2);
}

/* --- Card img / thumbnail dark --- */
body.dark-mode .card-img-top,
body.dark-mode .img-thumbnail {
  border-color: var(--dark-border);
}

/* --- Tooltip dark --- */
body.dark-mode .tooltip .tooltip-inner {
  background-color: var(--dark-card2);
  color: var(--dark-text);
}

/* --- Popover dark --- */
body.dark-mode .popover {
  background-color: var(--dark-card);
  border-color: var(--dark-border);
}
body.dark-mode .popover-header {
  background-color: var(--dark-card2);
  border-bottom-color: var(--dark-border);
  color: var(--dark-text);
}
body.dark-mode .popover-body { color: var(--dark-text); }

/* --- Spinner dark --- */
body.dark-mode .spinner-border { color: var(--primary-light); }

/* --- Breadcrumb dark --- */
body.dark-mode .breadcrumb {
  background-color: var(--dark-card2);
}
body.dark-mode .breadcrumb-item a      { color: var(--primary-light); }
body.dark-mode .breadcrumb-item.active { color: var(--dark-muted); }
body.dark-mode .breadcrumb-item + .breadcrumb-item::before { color: var(--dark-muted); }

/* --- Close button in alerts/cards dark --- */
body.dark-mode .alert .btn-close { filter: invert(1) brightness(1.8); }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%) !important;
  box-shadow: 0 2px 20px rgba(79,70,229,0.25);
  padding: 0.6rem 1rem;
  transition: var(--transition);
  position: relative;
  overflow: visible;
}
.navbar .container,
.navbar .container-fluid { position: relative; }
.navbar::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(90deg, transparent, #E9A74E 20%, #f0c47a 50%, #E9A74E 80%, transparent);
  box-shadow: 0 0 14px rgba(233,167,78,0.65);
}

/* ── Medalla SIGUA colgante (izquierda navbar) ── */
.sigua-nav-medal {
  position: absolute;
  bottom: -62px;
  left: 0;
  transform: none;
  width: 110px; height: 110px;
  border-radius: 50%;
  background: #ffffff;
  border: 4px solid #E9A74E;
  box-shadow: 0 8px 40px rgba(0,0,0,0.35),
              0 0 20px rgba(233,167,78,0.4);
  display: flex; align-items: center; justify-content: center;
  padding: 14px;
  z-index: 1031;
  text-decoration: none;
}
.sigua-nav-medal img {
  width: 100%; height: 100%;
  object-fit: contain;
}
.sigua-nav-medal::before {
  content: '';
  position: absolute; inset: -8px;
  border-radius: 50%;
  border: 1px solid rgba(233,167,78,0.35);
  pointer-events: none;
}

.navbar-brand {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 1.2rem;
  color: #fff !important;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.3px;
}

.navbar-brand i {
  color: var(--accent);
  font-size: 1.3rem;
}

.navbar .nav-link {
  color: rgba(255,255,255,0.82) !important;
  font-weight: 500;
  padding: 0.4rem 0.8rem !important;
  border-radius: 6px;
  transition: var(--transition);
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: #fff !important;
  background-color: rgba(255,255,255,0.14);
}

/* Pestañas admin — modo claro */
.nav-tabs .nav-link {
  color: var(--text) !important;
  font-weight: 600;
  border-radius: 8px 8px 0 0;
  transition: var(--transition);
}

.nav-tabs .nav-link:hover {
  color: var(--primary) !important;
  background-color: rgba(79,70,229,0.07);
  border-color: transparent;
}

.nav-tabs .nav-link.active {
  color: var(--primary) !important;
  background-color: var(--bg-card);
  border-color: #dee2e6 #dee2e6 var(--bg-card);
  border-bottom: 2px solid var(--primary);
}

.navbar-toggler {
  border-color: rgba(255,255,255,0.3);
}

.navbar-toggler-icon {
  filter: brightness(0) invert(1);
}

.badge-semestre {
  background: linear-gradient(135deg, var(--accent), #0891b2);
  color: #fff;
  font-weight: 700;
  font-size: 0.75rem;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  letter-spacing: 0.2px;
}

#btn-darkmode {
  background: rgba(255,255,255,0.1);
  border: 1.5px solid rgba(255,255,255,0.35);
  color: #fff;
  border-radius: 8px;
  padding: 0.35rem 0.65rem;
  font-size: 1.05rem;
  cursor: pointer;
  transition: var(--transition);
}

#btn-darkmode:hover {
  background-color: rgba(255,255,255,0.2);
  border-color: rgba(255,255,255,0.6);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero-section {
  background: linear-gradient(-45deg, #1a3d45, #357B89, #E9A74E, #2a6270);
  background-size: 400%;
  animation: heroGradAlg 9s ease infinite;
  color: #fff;
  padding: 7rem 1rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -40%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: rgba(255,255,255,0.04);
  border-radius: 50%;
  pointer-events: none;
}

@keyframes heroGradAlg {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes heroFadeSlide {
  from { opacity: 0; transform: translateY(36px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero-section h1 {
  animation: heroFadeSlide 0.85s cubic-bezier(0.22,1,0.36,1) both;
  font-weight: 800;
  font-size: clamp(1.8rem, 5vw, 3rem);
  letter-spacing: -0.5px;
}

.hero-section p {
  animation: heroFadeIn 0.85s 0.25s cubic-bezier(0.22,1,0.36,1) both;
  font-size: 1.15rem;
  opacity: 0.92;
  max-width: 600px;
  margin: 0 auto 2rem;
}

.hero-section .btn-hero {
  animation: heroFadeIn 0.85s 0.45s cubic-bezier(0.22,1,0.36,1) both;
}

.hero-accent { color: var(--accent); }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  background-color: var(--bg-card);
  box-shadow: var(--shadow);
  transition: var(--transition);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

.card-modulo:hover {
  transform: translateY(-4px);
}

.card-header-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-weight: 700;
  padding: 1rem 1.25rem;
}

.card-header-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  font-weight: 700;
  padding: 1rem 1.25rem;
}

.card-tipo-quiz {
  cursor: pointer;
  border: 2px solid var(--border);
  transition: var(--transition);
  border-radius: var(--border-radius);
}

.card-tipo-quiz:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.card-tipo-quiz.seleccionado {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(79,70,229,0.06), rgba(6,182,212,0.04));
  box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}

/* ============================================================
   BADGES DE NIVEL
   ============================================================ */
.badge-basico {
  background: linear-gradient(135deg, #10b981, #059669);
  color: #fff;
  font-size: 0.75rem;
  padding: 0.3rem 0.65rem;
  border-radius: 20px;
  font-weight: 600;
}

.badge-intermedio {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  color: #fff;
  font-size: 0.75rem;
  padding: 0.3rem 0.65rem;
  border-radius: 20px;
  font-weight: 600;
}

.badge-avanzado {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: #fff;
  font-size: 0.75rem;
  padding: 0.3rem 0.65rem;
  border-radius: 20px;
  font-weight: 600;
}

.badge-nota {
  font-size: 0.88rem;
  font-weight: 700;
  padding: 0.3rem 0.7rem;
  border-radius: 20px;
}

.badge-nota-excelente { background: linear-gradient(135deg,#10b981,#059669); color:#fff; }
.badge-nota-bien      { background: linear-gradient(135deg,#34d399,#10b981); color:#fff; }
.badge-nota-regular   { background: linear-gradient(135deg,#357B89,#2a6270); color:#fff; }
.badge-nota-aceptable { background: linear-gradient(135deg,#f59e0b,#d97706); color:#fff; }
.badge-nota-minimo    { background: linear-gradient(135deg,#f97316,#ea580c); color:#fff; }
.badge-nota-reprueba  { background: linear-gradient(135deg,#ef4444,#dc2626); color:#fff; }

/* ============================================================
   OPCIONES DEL QUIZ
   ============================================================ */
.opcion-quiz {
  display: flex;
  align-items: flex-start;
  width: 100%;
  text-align: left;
  padding: 0.9rem 1.2rem;
  margin-bottom: 0.65rem;
  border: 2px solid var(--border);
  border-radius: var(--border-radius);
  background-color: #fff;
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
  font-size: 1rem;
  font-family: 'Inter', sans-serif;
  position: relative;
}

.opcion-quiz:hover:not(:disabled) {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(79,70,229,0.04), rgba(6,182,212,0.02));
  transform: translateX(4px);
}

.opcion-quiz.seleccionada {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(6,182,212,0.05));
  font-weight: 600;
}

.opcion-quiz.correcta {
  border-color: var(--success);
  background-color: rgba(16,185,129,0.08);
  color: #065f46;
  font-weight: 600;
}

.opcion-quiz.incorrecta {
  border-color: var(--error);
  background-color: rgba(239,68,68,0.08);
  color: #991b1b;
  font-weight: 600;
}

.opcion-quiz:disabled {
  cursor: not-allowed;
  opacity: 0.85;
}

.opcion-letra {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  margin-right: 0.75rem;
  flex-shrink: 0;
}

.opcion-quiz.correcta .opcion-letra  { background: var(--success); }
.opcion-quiz.incorrecta .opcion-letra { background: var(--error); }

/* ============================================================
   BARRA DE PROGRESO
   ============================================================ */
.barra-progreso-quiz {
  height: 8px;
  border-radius: 4px;
  background-color: #dde3f0;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.barra-progreso-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width 0.4s cubic-bezier(0.22,1,0.36,1);
}

/* ============================================================
   TEMPORIZADOR
   ============================================================ */
#timer-display {
  font-family: 'Fira Code', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  background: rgba(79,70,229,0.08);
  padding: 0.3rem 0.8rem;
  border-radius: 8px;
  border: 2px solid rgba(79,70,229,0.2);
  transition: var(--transition);
  display: inline-block;
  min-width: 70px;
  text-align: center;
}

#timer-display.timer-alert {
  color: var(--error);
  background-color: rgba(239,68,68,0.1);
  border-color: var(--error);
  animation: timerPulse 1s infinite;
}

.timer-alert {
  color: var(--error) !important;
  background-color: rgba(239,68,68,0.1) !important;
  border-color: var(--error) !important;
  animation: timerPulse 1s infinite;
}

@keyframes timerPulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.65; }
}

/* ============================================================
   DOTS / INDICADORES
   ============================================================ */
.dots-container {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 1rem;
}

.dot-pregunta {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: #dde3f0;
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
}

.dot-pregunta.respondida {
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

.dot-pregunta.actual {
  border-color: var(--accent);
  transform: scale(1.3);
}

/* ============================================================
   BLOQUES DE CÓDIGO
   ============================================================ */
pre {
  background-color: #f8f8f8;
  color: #1e1e1e;
  border-radius: var(--border-radius);
  padding: 1.2rem 1.4rem;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.92rem;
  line-height: 1.65;
  overflow-x: auto;
  position: relative;
  margin-bottom: 0;
  border: 1px solid #ddd;
}

code {
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.92em;
}

pre code { color: inherit; background: none; padding: 0; }

/* Contenido de la opción (texto / código / imagen) */
.opcion-contenido {
  display: block;
  flex: 1;
  min-width: 0;        /* evita que el pre desborde el flex container */
  word-break: break-word;
}

/* Una sola columna cuando hay código — ancho completo para legibilidad */
#opciones-oficial.con-codigo {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
#opciones-oficial.con-codigo .opcion-quiz {
  margin-bottom: 0;
  width: 100%;
}

/* Código dentro de opciones A/B/C/D del quiz */
.opcion-code {
  display: block;
  background-color: #f8f8f8;
  color: #1e1e1e;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 8px 10px;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.78rem;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;          /* preserva saltos de línea; líneas muy largas → scroll horizontal */
  text-align: left;
  margin-top: 6px;
  margin-bottom: 0;
  width: 100%;
  box-sizing: border-box;
}
body.dark-mode .opcion-code {
  background-color: #21252b;
  color: #abb2bf;
  border-color: #3a3f47;
}
.opcion-img-opt {
  display: block;
  max-height: 140px;
  max-width: 100%;
  border-radius: 6px;
  border: 1px solid #ddd;
  margin-top: 6px;
}
body.dark-mode .opcion-img-opt { border-color: #3a3f47; }

.codigo-wrapper {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  margin-bottom: 1rem;
}

.btn-copiar {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background-color: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: #e2e8f0;
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Inter', sans-serif;
}

.btn-copiar:hover { background-color: rgba(255,255,255,0.2); }

.btn-copiar.copiado {
  background-color: var(--success);
  border-color: var(--success);
  color: #fff;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  background-color: #fff;
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding: 0.5rem 0;
}

.sidebar-titulo-grupo {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary);
  padding: 0.75rem 1rem 0.35rem;
}

.sidebar-item {
  display: block;
  padding: 0.55rem 1rem 0.55rem 1.3rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.92rem;
  transition: var(--transition);
  border-left: 3px solid transparent;
  cursor: pointer;
}

.sidebar-item:hover {
  background: rgba(79,70,229,0.06);
  border-left-color: var(--primary);
  color: var(--primary);
}

.sidebar-item.active {
  background: rgba(79,70,229,0.1);
  border-left-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

.sidebar-item .icono-visitado {
  color: var(--success);
  font-size: 0.7rem;
  margin-left: 4px;
}

.sidebar::-webkit-scrollbar { width: 5px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 10px;
}

/* ============================================================
   BÚSQUEDA SIDEBAR
   ============================================================ */
.busqueda-sidebar {
  width: 100%;
  padding: 0.5rem 0.85rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: 'Inter', sans-serif;
  background-color: #fff;
  color: var(--text);
  transition: var(--transition);
  margin-bottom: 0.5rem;
}

.busqueda-sidebar:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.12);
}

/* ============================================================
   PANEL DESLIZABLE DE TEMAS (móvil) — temas.html de cada asignatura
   En escritorio (≥992px) el sidebar se queda fijo al lado del contenido,
   sin cambios. Debajo de ese ancho se convierte en un cajón que se abre
   con el botón "Temas del curso" y se cierra al elegir un tema o tocar
   el fondo oscuro.
   ============================================================ */
.btn-temas-mobile-abrir {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.92rem;
}

body.dark-mode .btn-temas-mobile-abrir {
  background: var(--dark-card);
  border-color: var(--dark-border);
  color: var(--primary-light);
}

#temas-drawer-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 1090;
}

#temas-drawer-backdrop.show { display: block; }

.temas-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.6rem 0.6rem;
  margin-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}

.temas-drawer-header .btn-cerrar-drawer {
  background: none;
  border: none;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--text);
  padding: 0.1rem 0.4rem;
}

body.dark-mode .temas-drawer-header { border-bottom-color: var(--dark-border); }
body.dark-mode .temas-drawer-header .btn-cerrar-drawer { color: var(--dark-text); }

@media (max-width: 991.98px) {
  #col-sidebar-temas {
    position: fixed;
    top: 0;
    left: -340px;
    width: min(320px, 85vw);
    max-width: none;
    min-width: 0;
    height: 100vh;
    z-index: 1095;
    background: var(--bg);
    padding: 0 !important;
    transition: left 0.28s ease;
    box-shadow: 8px 0 30px rgba(0,0,0,0.25);
    overflow-y: auto;
  }

  #col-sidebar-temas.show { left: 0; }

  #col-sidebar-temas .sidebar {
    position: static;
    max-height: none;
    height: 100%;
    border: none;
    border-radius: 0;
    box-shadow: none;
    padding: 0.75rem;
  }
}

@media (min-width: 992px) {
  .btn-temas-mobile-abrir,
  #temas-drawer-backdrop,
  .temas-drawer-header { display: none !important; }
}

/* ============================================================
   TIP BOX
   ============================================================ */
.tip-box {
  background: linear-gradient(135deg, rgba(245,158,11,0.06), rgba(251,191,36,0.04));
  border-left: 4px solid var(--warning);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  padding: 0.9rem 1.1rem;
  margin-top: 1.5rem;
  font-size: 0.95rem;
  color: #78350f;
}

.tip-box strong { color: #92400e; }

/* ============================================================
   PANEL COMPARACIÓN
   ============================================================ */
.panel-comparacion {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 768px) {
  .panel-comparacion { grid-template-columns: 1fr; }
}

.panel-pseudocodigo-label {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.panel-java-label {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ============================================================
   ERRORES COMUNES
   ============================================================ */
.errores-lista {
  list-style: none;
  padding: 0;
  margin: 0;
}

.errores-lista li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  color: #7f1d1d;
}

.errores-lista li:last-child { border-bottom: none; }
.errores-lista li i { color: var(--error); margin-top: 2px; flex-shrink: 0; }

/* ============================================================
   TABLA DE RESULTADOS
   ============================================================ */
.tabla-resultados { border-collapse: separate; border-spacing: 0; }

.tabla-resultados thead th {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.85rem 1rem;
  border: none;
}

.tabla-resultados thead th:first-child { border-radius: 10px 0 0 0; }
.tabla-resultados thead th:last-child  { border-radius: 0 10px 0 0; }

.tabla-resultados tbody tr { transition: var(--transition); }

.tabla-resultados tbody tr:hover {
  background: rgba(79,70,229,0.05);
}

.tabla-resultados tbody td {
  padding: 0.75rem 1rem;
  vertical-align: middle;
  border-bottom: 1px solid var(--border);
  font-size: 0.93rem;
}

/* ============================================================
   CARD ESTADÍSTICAS
   ============================================================ */
.card-stat {
  text-align: center;
  padding: 1.5rem;
}

.card-stat .stat-valor {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.card-stat .stat-label {
  font-size: 0.88rem;
  color: #6b7a99;
  margin-top: 0.35rem;
}

body.dark-mode .card-stat .stat-valor {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
}
body.dark-mode .card-stat .stat-label { color: var(--dark-muted); }

/* ============================================================
   PANTALLAS QUIZ
   ============================================================ */
.pantalla-quiz { display: none; }
.pantalla-quiz.activa { display: block; }

/* ============================================================
   REVISIÓN DE RESPUESTAS
   ============================================================ */
.revision-item {
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 1.1rem 1.3rem;
  margin-bottom: 1rem;
  background-color: #fff;
  transition: var(--transition);
}

.revision-item.correcta-revision {
  border-left: 4px solid var(--success);
  background: rgba(16,185,129,0.03);
}

.revision-item.incorrecta-revision {
  border-left: 4px solid var(--error);
  background: rgba(239,68,68,0.03);
}

.revision-explicacion {
  background: rgba(79,70,229,0.05);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  font-size: 0.9rem;
  color: #2a6270;
  margin-top: 0.75rem;
  border-left: 3px solid var(--primary-light);
}

/* ============================================================
   RESULTADO FINAL
   ============================================================ */
.resultado-nota {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1;
}

.resultado-porcentaje {
  font-size: 1.3rem;
  color: #6b7a99;
}

/* ============================================================
   PASOS
   ============================================================ */
.paso-numero {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 1.3rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(79,70,229,0.3);
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: rgba(255,255,255,0.75);
  text-align: center;
  padding: 1.5rem 1rem;
  font-size: 0.88rem;
  border-top: 4px solid var(--accent);
  margin-top: auto;
  flex-shrink: 0;
  width: 100%;
}

footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; color: #67e8f9; }

/* ============================================================
   ACCESIBILIDAD
   ============================================================ */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.5rem 1rem;
  background-color: var(--primary);
  color: #fff;
  font-weight: 700;
  border-radius: 0 0 8px 8px;
  text-decoration: none;
  font-size: 0.95rem;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; outline: 3px solid var(--accent); }

:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

button:focus-visible, a:focus-visible,
input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

body.dark-mode :focus-visible,
body.dark-mode button:focus-visible,
body.dark-mode a:focus-visible,
body.dark-mode input:focus-visible,
body.dark-mode select:focus-visible,
body.dark-mode textarea:focus-visible {
  outline-color: var(--accent);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 576px) {
  .hero-section { padding: 5rem 1rem 3rem; }
  .resultado-nota { font-size: 3rem; }
  .card-tipo-quiz { margin-bottom: 0.5rem; }
  .tabla-resultados thead th,
  .tabla-resultados tbody td { padding: 0.55rem 0.65rem; font-size: 0.82rem; }
}

/* ============================================================
   NAVBAR MOVIL ESTUDIANTE
   ============================================================ */
.sigua-est-mobile-buttons,
.sigua-est-overlay-panel {
  display: none;
}

@media (max-width: 991.98px) {
  body.sigua-estudiante-page #nav-asig-label {
    max-width: 40vw !important;
    margin-left: 90px !important;
  }

  body.sigua-estudiante-page .navbar .container,
  body.sigua-estudiante-page .navbar .container-fluid {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: nowrap;
  }

  body.sigua-estudiante-page .navbar-toggler {
    display: none !important;
  }

  body.sigua-estudiante-page .badge-semestre,
  body.sigua-estudiante-page #nav-est-nombre,
  body.sigua-estudiante-page #nav-est-clave,
  body.sigua-estudiante-page #nav-est-salir,
  body.sigua-estudiante-page #navbarMain {
    display: none !important;
  }

  body.sigua-estudiante-page .sigua-est-mobile-buttons {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    margin-left: auto;
    margin-right: 0.4rem;
  }

  body.sigua-estudiante-page .btn-est-mobile-toggle {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.35);
    background: rgba(255,255,255,0.12);
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
  }

  body.sigua-estudiante-page .sigua-est-overlay-panel {
    position: fixed;
    top: 74px;
    right: 10px;
    left: auto;
    width: min(270px, calc(100vw - 20px));
    z-index: 1080;
    background: rgba(14,53,61,0.98);
    border: 1px solid rgba(255,255,255,0.18);
    border-radius: 12px;
    box-shadow: 0 12px 26px rgba(0,0,0,0.28);
    padding: 0.4rem 0.45rem;
  }

  body.sigua-estudiante-page .sigua-est-overlay-panel.show {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.38rem;
  }

  body.sigua-estudiante-page .sigua-est-main-chip {
    border: none;
    border-radius: 0;
    background: transparent;
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.42rem 0.2rem;
    text-align: left;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
  }

  body.sigua-estudiante-page .sigua-est-main-chip.static {
    opacity: 0.95;
  }

  body.sigua-estudiante-page .sigua-est-main-chip.danger {
    color: #ffd0d0;
  }

  body.sigua-estudiante-page .sigua-est-nav-chip {
    border: none;
    border-radius: 0;
    background: transparent;
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.8rem;
    padding: 0.42rem 0.2rem;
    text-align: left;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
  }
}

/* ============================================================
   UTILIDADES
   ============================================================ */
.text-primary-custom { color: var(--primary) !important; }
.text-accent         { color: var(--accent) !important; }
.bg-primary-custom   { background-color: var(--primary) !important; }
.bg-accent           { background-color: var(--accent) !important; }
.border-accent       { border-color: var(--accent) !important; }
.fw-600              { font-weight: 600; }
.fw-700              { font-weight: 700; }
.fw-800              { font-weight: 800; }

.btn-outline-teal {
  color: var(--primary);
  border-color: var(--primary);
}
.btn-outline-teal:hover {
  background-color: var(--primary);
  color: #fff;
}

.hr-accent {
  border: none;
  border-top: 2px solid var(--accent);
  opacity: 1;
}

.icono-vacio {
  font-size: 5rem;
  color: var(--border);
  display: block;
  text-align: center;
  margin-bottom: 1rem;
}

/* ============================================================
   LOGO SIGUA
   ============================================================ */

/* Navbar brand */
.sigua-nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}
.nav-logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(53,123,137,0.35);
}
.nav-logo-text {
  font-family: 'Fira Code', monospace;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #fff;
}
.nav-logo-accent {
  color: var(--accent);
}

/* Logo grande — login */
.sigua-logomark {
  width: 88px;
  height: 88px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.8rem;
  color: #fff;
  box-shadow: 0 12px 40px rgba(53,123,137,0.40), 0 2px 8px rgba(233,167,78,0.25);
  position: relative;
}
.sigua-logomark::after {
  content: '';
  position: absolute;
  inset: 3px;
  border-radius: 20px;
  border: 1.5px solid rgba(255,255,255,0.25);
  pointer-events: none;
}

/* Logo texto — login */
.sigua-brand-text {
  font-family: 'Fira Code', monospace;
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1;
}
.brand-edu   { color: var(--primary); }
.brand-panel { color: var(--accent); }

.brand-tagline {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.3px;
  margin-top: 4px;
}

/* Logo pequeño — dashboard */
.sigua-logomark-sm {
  width: 46px;
  height: 46px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #fff;
  box-shadow: 0 4px 14px rgba(53,123,137,0.30);
  flex-shrink: 0;
}
.sigua-brand-text-sm {
  font-family: 'Fira Code', monospace;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.1;
}

/* Login background */
.login-bg {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 1rem 2rem;
  background: #071520;
  overflow: hidden;
  position: relative;
}

/* Orbs de color animados */
.login-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(72px);
  pointer-events: none;
  will-change: transform;
}
.login-orb-1 {
  width: 520px; height: 520px;
  background: rgba(53,123,137,0.60);
  top: -180px; left: -120px;
  animation: orbA 13s ease-in-out infinite;
}
.login-orb-2 {
  width: 440px; height: 440px;
  background: rgba(233,167,78,0.50);
  bottom: -140px; right: -80px;
  animation: orbB 17s ease-in-out infinite;
}
.login-orb-3 {
  width: 340px; height: 340px;
  background: rgba(192,90,80,0.45);
  top: 42%; left: 62%;
  animation: orbC 11s ease-in-out infinite;
}
.login-orb-4 {
  width: 300px; height: 300px;
  background: rgba(42,98,112,0.65);
  top: 12%; right: 18%;
  animation: orbD 19s ease-in-out infinite;
}
.login-orb-5 {
  width: 220px; height: 220px;
  background: rgba(233,167,78,0.35);
  bottom: 22%; left: 8%;
  animation: orbA 14s ease-in-out infinite reverse;
}

@keyframes orbA {
  0%,100% { transform: translate(0,0) scale(1); }
  25%     { transform: translate(90px,70px) scale(1.12); }
  50%     { transform: translate(50px,140px) scale(0.88); }
  75%     { transform: translate(-40px,90px) scale(1.06); }
}
@keyframes orbB {
  0%,100% { transform: translate(0,0) scale(1); }
  33%     { transform: translate(-75px,-55px) scale(1.18); }
  66%     { transform: translate(-35px,-115px) scale(0.82); }
}
@keyframes orbC {
  0%,100% { transform: translate(-50%,-50%) scale(1); }
  40%     { transform: translate(calc(-50% - 85px),calc(-50% - 65px)) scale(1.25); }
  70%     { transform: translate(calc(-50% + 65px),calc(-50% + 45px)) scale(0.78); }
}
@keyframes orbD {
  0%,100% { transform: translate(0,0) scale(1); }
  50%     { transform: translate(-95px,75px) scale(1.35); }
}

.login-card {
  background: rgba(255,255,255,0.97);
  border: 1px solid rgba(255,255,255,0.55);
  border-radius: 24px;
  box-shadow: 0 32px 80px rgba(0,0,0,0.60),
              0 0 0 1px rgba(233,167,78,0.15),
              0 0 50px rgba(53,123,137,0.18);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  width: 100%;
  position: relative;
  z-index: 1;
  animation: cardGlow 6s ease-in-out infinite;
}

@keyframes cardGlow {
  0%,100% { box-shadow: 0 32px 80px rgba(0,0,0,0.60), 0 0 50px rgba(53,123,137,0.18); }
  50%     { box-shadow: 0 32px 80px rgba(0,0,0,0.60), 0 0 90px rgba(233,167,78,0.28); }
}

body.dark-mode .login-card {
  background: rgba(22,27,34,0.97);
  border-color: rgba(255,255,255,0.08);
}

body.dark-mode .brand-tagline { color: var(--dark-muted); }

@keyframes aparecer {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.animar-entrada { animation: aparecer 0.4s ease both; }

.seccion { padding: 3.5rem 0; }

/* ============================================================
   PANEL ADMIN
   ============================================================ */
.admin-sidebar { background: var(--primary); min-height: 100vh; }
.admin-tab {
  cursor: pointer;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  transition: background 0.2s;
}
.admin-tab:hover { background: rgba(255,255,255,0.1); }
.admin-tab.activo {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff !important;
  font-weight: 700;
}

.badge-nota-verde    { background: linear-gradient(135deg,#10b981,#059669); color:#fff; }
.badge-nota-amarillo { background: linear-gradient(135deg,#f59e0b,#d97706); color:#fff; }
.badge-nota-rojo     { background: linear-gradient(135deg,#ef4444,#dc2626); color:#fff; }

/* ============================================================
   AVA — MATERIALES DIDÁCTICOS
   ============================================================ */
.materiales-panel {
  border-top: 2px solid var(--primary-light);
  margin-top: 1.5rem;
  padding-top: 1rem;
}
.material-card {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  background: var(--bg);
  border: 1px solid rgba(79,70,229,0.12);
  transition: box-shadow 0.18s, transform 0.18s;
  text-decoration: none;
  color: inherit;
}
.material-card:hover {
  box-shadow: 0 4px 16px rgba(79,70,229,0.14);
  transform: translateY(-2px);
}
.material-icon {
  width: 40px; height: 40px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; flex-shrink: 0;
}
.material-icon.tipo-pdf    { background:#fee2e2; color:#dc2626; }
.material-icon.tipo-imagen { background:#dbeafe; color:#2563eb; }
.material-icon.tipo-word   { background:#dbeafe; color:#1d4ed8; }
.material-icon.tipo-pptx   { background:#fed7aa; color:#ea580c; }
.material-icon.tipo-enlace { background:#d1fae5; color:#059669; }
.material-icon.tipo-video  { background:#ede9fe; color:#7c3aed; }
.material-meta { font-size: 0.78rem; color: var(--text); opacity: 0.6; }
body.dark-mode .material-card { background: var(--dark-card2); border-color: var(--dark-border); }
body.dark-mode .material-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.3); }

/* ============================================================
   AVA — FOROS
   ============================================================ */
.foro-hero {
  background: linear-gradient(-45deg,#1a4b8c,#1e3a8a,#312e81,#4f46e5);
  background-size: 300%;
  animation: heroGradAlg 10s ease infinite;
  color: #fff;
  padding: 2.5rem 0 2rem;
  text-align: center;
}
.foro-card {
  border-radius: 12px;
  border: 1px solid rgba(79,70,229,0.15);
  background: var(--bg-card);
  padding: 1rem 1.25rem;
  transition: box-shadow 0.18s, transform 0.18s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}
.foro-card:hover { box-shadow: 0 6px 20px rgba(79,70,229,0.13); transform: translateY(-2px); }
.foro-card.fijado { border-left: 4px solid var(--primary); }
.foro-card.cerrado { opacity: 0.65; }
.foro-badge-docente { background: linear-gradient(135deg,var(--primary),var(--primary-dark)); color:#fff; font-size:0.72rem; padding:0.2em 0.55em; border-radius:20px; }
.foro-badge-cerrado { background: #f3f4f6; color: #6b7280; font-size:0.72rem; padding:0.2em 0.55em; border-radius:20px; }
body.dark-mode .foro-badge-cerrado { background: var(--dark-card2); color: var(--dark-muted); }

/* Hilo de foro */
.foro-hilo-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: 12px 12px 0 0;
  padding: 1.25rem 1.5rem;
}
.msg-burbuja {
  padding: 0.75rem 1rem;
  border-radius: 12px;
  max-width: 85%;
  font-size: 0.93rem;
  line-height: 1.5;
  word-break: break-word;
}
.msg-burbuja.docente { background: linear-gradient(135deg,var(--primary),#6366f1); color:#fff; margin-left: auto; border-bottom-right-radius: 3px; }
.msg-burbuja.estudiante { background: var(--bg); border: 1px solid rgba(79,70,229,0.12); border-bottom-left-radius: 3px; }
body.dark-mode .msg-burbuja.estudiante { background: var(--dark-card2); border-color: var(--dark-border); }
.msg-autor { font-size: 0.75rem; font-weight: 700; margin-bottom: 0.2rem; }
.msg-tiempo { font-size: 0.7rem; opacity: 0.6; margin-top: 0.25rem; }

/* ============================================================
   AVA — CHAT
   ============================================================ */
.chat-hero {
  background: linear-gradient(-45deg,#065f46,#0f766e,#0891b2,#0369a1);
  background-size: 300%;
  animation: heroGradAlg 10s ease infinite;
  color: #fff;
  padding: 2rem 0 1.5rem;
  text-align: center;
}
.chat-container {
  height: calc(100vh - 320px);
  min-height: 300px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1rem;
  scroll-behavior: smooth;
}
.chat-burbuja-wrap { display: flex; flex-direction: column; }
.chat-burbuja-wrap.yo { align-items: flex-end; }
.chat-burbuja-wrap.otro { align-items: flex-start; }
.chat-burbuja {
  padding: 0.55rem 0.9rem;
  border-radius: 16px;
  max-width: 72%;
  font-size: 0.9rem;
  word-break: break-word;
  line-height: 1.45;
}
.chat-burbuja.yo { background: linear-gradient(135deg,var(--accent),var(--accent-dark)); color:#fff; border-bottom-right-radius: 4px; }
.chat-burbuja.docente-msg { background: linear-gradient(135deg,var(--primary),var(--primary-dark)); color:#fff; border-bottom-left-radius: 4px; }
.chat-burbuja.otro { background: var(--bg); border: 1px solid rgba(6,182,212,0.15); border-bottom-left-radius: 4px; }
body.dark-mode .chat-burbuja.otro { background: var(--dark-card2); border-color: var(--dark-border); }
.chat-autor { font-size: 0.7rem; font-weight: 700; margin-bottom: 0.15rem; color: var(--text); opacity: 0.7; }
.chat-tiempo { font-size: 0.66rem; opacity: 0.55; margin-top: 0.1rem; }
.chat-input-bar {
  border-top: 1px solid rgba(0,0,0,0.08);
  padding: 0.75rem 1rem;
  background: var(--bg-card);
}
body.dark-mode .chat-input-bar { background: var(--dark-card); border-color: var(--dark-border); }
.chat-separador-dia {
  text-align: center; font-size: 0.7rem; color: var(--text); opacity: 0.45;
  margin: 0.5rem 0; position: relative;
}
.chat-separador-dia::before, .chat-separador-dia::after {
  content:''; position: absolute; top: 50%; width: 40%; height: 1px;
  background: currentColor; opacity: 0.2;
}
.chat-separador-dia::before { left: 0; }
.chat-separador-dia::after  { right: 0; }

/* verificación de código en foros/chat */
.verificar-card {
  max-width: 400px; margin: 3rem auto;
  padding: 2rem; border-radius: 16px;
  border: 1px solid rgba(79,70,229,0.15);
  background: var(--bg-card);
  box-shadow: 0 8px 32px rgba(79,70,229,0.1);
  text-align: center;
}
body.dark-mode .verificar-card { background: var(--dark-card); border-color: var(--dark-border); }