/* =========================================================
   Plataforma de cursos — sistema de diseño v2
   Inspirado en apps de productividad (Drive/Dropbox/OneDrive):
   mucho blanco, tipografía simple, íconos consistentes,
   colores discretos, jerarquía clara.
   Tipografía: Fraunces (títulos) + Inter (texto) + JetBrains Mono (datos)
   ========================================================= */

:root{
  --acento: #2A6EBB;
  --acento-oscuro: #1F5493;
  --acento-suave: #EAF2FB;
  --tinta: #1B2430;
  --tinta-suave: #4A5568;
  --gris-100: #F7F8FA;
  --gris-200: #EEF0F3;
  --gris-300: #E1E5EA;
  --gris-400: #C8CED6;
  --papel: #FFFFFF;
  --texto: #232B36;
  --texto-tenue: #6B7480;
  --verde: #2E7D5B;
  --verde-suave: #E7F3ED;
  --rojo: #C0392B;
  --rojo-suave: #FBEAE7;
  --borde: #E4E7EB;
  --radio: 10px;
  --radio-chico: 7px;
  --sombra: 0 1px 2px rgba(20,30,45,.06), 0 6px 20px rgba(20,30,45,.05);
}

*{box-sizing:border-box}
html{color-scheme:light}
html[data-tema="oscuro"]{color-scheme:dark}
html,body{height:100%}
body{
  margin:0;
  background:var(--gris-100);
  color:var(--texto);
  font-family:'Inter',system-ui,-apple-system,Segoe UI,sans-serif;
  font-size:14.5px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:'Fraunces',Georgia,serif;
  color:var(--tinta);
  font-weight:600;
  margin:0 0 .35em;
  letter-spacing:-0.01em;
}
a{color:var(--acento-oscuro);text-decoration:none}
a:hover{text-decoration:underline}
.mono{font-family:'JetBrains Mono',ui-monospace,monospace}
.icono{flex-shrink:0;display:block}

/* --- Layout de autenticación --- */
.auth-wrap{min-height:100vh;display:grid;grid-template-columns:1.05fr 1fr}
@media (max-width:860px){ .auth-wrap{grid-template-columns:1fr} }

.auth-marca{
  background:linear-gradient(165deg,var(--tinta) 0%,#0f1622 100%);
  color:#fff;padding:56px;display:flex;flex-direction:column;justify-content:space-between;
}
@media (max-width:860px){ .auth-marca{display:none} }
.auth-marca .eyebrow{font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:#7FB2E6;margin-bottom:18px}
.auth-marca h1{color:#fff;font-size:36px;line-height:1.18;max-width:9.6em}
.auth-marca p{color:#AEB9C4;max-width:32em;font-size:15px}
.auth-marca .pie{font-size:13px;color:#7C8A99}

.auth-panel{display:flex;align-items:center;justify-content:center;padding:32px}
.auth-card{width:100%;max-width:380px}
.auth-card h2{font-size:23px;margin-bottom:.2em}
.auth-card .sub{color:var(--texto-tenue);margin-bottom:26px;font-size:14px}

/* --- Formularios --- */
.campo{margin-bottom:17px}
.campo label{display:block;font-size:13px;font-weight:600;color:var(--tinta-suave);margin-bottom:6px}
.campo input, .campo select, .campo textarea{
  width:100%;padding:10px 12px;border:1px solid var(--gris-400);border-radius:var(--radio-chico);
  font-size:14px;font-family:inherit;background:var(--papel);color:var(--texto);
}
.campo input:focus, .campo select:focus, .campo textarea:focus{
  outline:2px solid var(--acento);outline-offset:1px;border-color:var(--acento);
}
.campo textarea{resize:vertical;min-height:85px}
.campo .ayuda{font-size:12px;color:var(--texto-tenue);margin-top:5px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:9px 16px;border-radius:var(--radio-chico);border:1px solid transparent;
  font-size:13.8px;font-weight:600;cursor:pointer;font-family:inherit;
  transition:background .15s ease,border-color .15s ease;
}
.btn .icono{width:16px;height:16px}
.btn-primario{background:var(--acento);color:#fff}
.btn-primario:hover{background:var(--acento-oscuro);text-decoration:none}
.btn-oscuro{background:var(--tinta);color:#fff}
.btn-oscuro:hover{background:#0f1622;text-decoration:none}
.btn-linea{background:var(--papel);border-color:var(--gris-400);color:var(--tinta)}
.btn-linea:hover{border-color:var(--acento);color:var(--acento-oscuro);text-decoration:none}
.btn-peligro{background:#fff;border-color:var(--rojo);color:var(--rojo)}
.btn-peligro:hover{background:var(--rojo);color:#fff;text-decoration:none}
.btn-chico{padding:6px 11px;font-size:12.5px}
.btn-block{width:100%}
.btn-icono{padding:7px;border-radius:7px;background:transparent;border:1px solid transparent;color:var(--texto-tenue)}
.btn-icono:hover{background:var(--gris-200);color:var(--texto)}

.alerta{padding:11px 14px;border-radius:var(--radio-chico);font-size:13.8px;margin-bottom:18px;display:flex;gap:9px;align-items:center}
.alerta-error{background:var(--rojo-suave);border:1px solid #ECC5BE;color:#7d271e}
.alerta-ok{background:var(--verde-suave);border:1px solid #BFE0CD;color:#1f4a35}

/* =========================================================
   App shell (post-login): sidebar clara estilo Drive/Dropbox
   ========================================================= */
.app{display:grid;grid-template-columns:236px 1fr;min-height:100vh}
@media (max-width:820px){ .app{grid-template-columns:1fr} }

.nav{
  background:var(--papel);
  border-right:1px solid var(--borde);
  padding:22px 14px;
  display:flex;flex-direction:column;
  position:sticky;top:0;height:100vh;
}
@media (max-width:820px){
  .nav{
    position:relative;height:auto;min-width:0;flex-direction:column;align-items:stretch;
    padding:16px;border-right:none;border-bottom:1px solid var(--borde)
  }
}

.nav .marca{
  font-family:'Fraunces',serif;font-size:18px;font-weight:600;color:var(--tinta);
  display:flex;align-items:center;gap:9px;padding:6px 10px 22px;
}
.nav .marca .icono{color:var(--acento)}
@media (max-width:820px){ .nav .marca{padding:4px 8px 16px;margin:0} }

.nav .usuario{
  display:flex;align-items:center;gap:9px;padding:8px 10px 16px;font-size:13px;color:var(--texto-tenue);
  border-bottom:1px solid var(--gris-200);margin-bottom:12px;
}
.nav .usuario .avatar{
  width:30px;height:30px;border-radius:50%;background:var(--acento-suave);color:var(--acento-oscuro);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex-shrink:0;
}
@media (max-width:820px){ .nav .usuario{display:flex} }

.nav .enlaces{display:flex;flex-direction:column;gap:2px}
.nav a.enlace-nav{
  display:flex;align-items:center;gap:11px;color:var(--tinta-suave);
  padding:9px 11px;border-radius:var(--radio-chico);font-size:14px;font-weight:500;
}
.nav a.enlace-nav:hover{background:var(--gris-200);color:var(--tinta);text-decoration:none}
.nav a.enlace-nav.activo{background:var(--acento-suave);color:var(--acento-oscuro)}
.nav a.enlace-nav .icono{color:inherit;opacity:.85}
@media (max-width:820px){ .nav .enlaces{display:flex;width:100%} }

.nav .separador{flex:1}
.nav a.salir{display:flex;align-items:center;gap:10px;color:var(--texto-tenue);padding:9px 11px;font-size:13.5px;border-radius:var(--radio-chico)}
.nav a.salir:hover{background:var(--gris-200);color:var(--rojo);text-decoration:none}
@media (max-width:820px){
  .nav .separador{display:none}
  .nav .boton-tema{margin-top:10px;border-top:1px solid var(--gris-200);border-radius:0;padding-top:13px}
  .nav a.salir span:not(.icono){display:inline}
}

.main{padding:34px 42px;max-width:1180px}
@media (max-width:700px){ .main{padding:20px} }

.encabezado-pagina{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:26px;flex-wrap:wrap;gap:12px}
.encabezado-pagina p{color:var(--texto-tenue);margin:.25em 0 0;font-size:14px}

/* --- Breadcrumbs --- */
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:4px;font-size:13.5px;color:var(--texto-tenue);margin-bottom:20px}
.breadcrumb a{color:var(--texto-tenue);display:flex;align-items:center;gap:5px}
.breadcrumb a:hover{color:var(--acento-oscuro);text-decoration:none}
.breadcrumb .sep{color:var(--gris-400);display:flex}
.breadcrumb .actual{color:var(--tinta);font-weight:600}

/* --- Tarjetas de curso --- */
.grid-cursos{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:18px}
.tarjeta-curso{background:var(--papel);border:1px solid var(--borde);border-radius:var(--radio);overflow:hidden;box-shadow:var(--sombra);display:flex;flex-direction:column;transition:box-shadow .15s ease,transform .1s ease}
.tarjeta-curso:hover{box-shadow:0 4px 18px rgba(20,30,45,.1)}
.tarjeta-curso .portada{height:110px;background:linear-gradient(135deg,var(--tinta),#2b3e5c);display:flex;align-items:center;justify-content:center;color:#fff;font-family:'Fraunces',serif;font-size:14.5px;background-size:cover;background-position:center;padding:0 16px;text-align:center}
.tarjeta-curso .cuerpo{padding:16px 17px 18px;flex:1;display:flex;flex-direction:column}
.tarjeta-curso h3{font-size:16px;margin-bottom:5px}
.tarjeta-curso p{color:var(--texto-tenue);font-size:13px;flex:1;margin:0 0 13px}
.tarjeta-curso .meta{font-size:12px;color:var(--texto-tenue);margin-bottom:10px;display:flex;gap:12px}

.vacio{border:1.5px dashed var(--gris-400);border-radius:var(--radio);padding:38px;text-align:center;color:var(--texto-tenue);background:var(--papel)}
.vacio .icono{color:var(--gris-400);margin:0 auto 10px}

/* --- Módulos del curso (listado tipo temario) --- */
.lista-modulos{display:flex;flex-direction:column;gap:10px}
.modulo-fila{
  display:flex;align-items:center;gap:16px;background:var(--papel);border:1px solid var(--borde);
  border-radius:var(--radio);padding:16px 18px;transition:border-color .15s ease,box-shadow .15s ease;
}
.modulo-fila:hover{border-color:var(--acento);box-shadow:var(--sombra)}
.modulo-fila .num{
  width:38px;height:38px;border-radius:9px;background:var(--acento-suave);color:var(--acento-oscuro);
  display:flex;align-items:center;justify-content:center;font-family:'JetBrains Mono',monospace;font-size:13px;font-weight:600;flex-shrink:0;
}
.modulo-fila .info{flex:1;min-width:0}
.modulo-fila h3{font-size:15.5px;margin:0 0 2px}
.modulo-fila p{margin:0;font-size:13px;color:var(--texto-tenue);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.modulo-fila .meta{font-size:12px;color:var(--texto-tenue);white-space:nowrap}

/* --- Explorador de carpetas y archivos (estilo Drive) --- */
.barra-herramientas{display:flex;gap:10px;margin-bottom:18px;flex-wrap:wrap}

.explorador{background:var(--papel);border:1px solid var(--borde);border-radius:var(--radio);overflow:hidden}
.fila-item{
  display:flex;align-items:center;gap:14px;padding:12px 18px;border-bottom:1px solid var(--gris-200);
}
.fila-item:last-child{border-bottom:none}
.fila-item:hover{background:var(--gris-100)}
.fila-item .icono-tipo{
  width:34px;height:34px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.fila-item .icono-tipo.carpeta{background:var(--acento-suave);color:var(--acento-oscuro)}
.fila-item .icono-tipo.pdf{background:#FBEAE7;color:#B23A2E}
.fila-item .icono-tipo.video{background:#EAE7FB;color:#5B3AB2}
.fila-item .icono-tipo.audio{background:#FBF3E7;color:#B2803A}
.fila-item .icono-tipo.imagen{background:#E7F3FB;color:#3A8CB2}
.fila-item .icono-tipo.documento{background:#E7F3ED;color:#2E7D5B}
.fila-item .icono-tipo.otro{background:var(--gris-200);color:var(--texto-tenue)}
.fila-item .nombre{flex:1;min-width:0}
.fila-item .nombre a{color:var(--texto);font-weight:600;font-size:14px}
.fila-item .nombre a:hover{color:var(--acento-oscuro);text-decoration:none}
.fila-item .nombre .desc{font-size:12.5px;color:var(--texto-tenue);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:420px}
.fila-item .meta{font-size:12.5px;color:var(--texto-tenue);white-space:nowrap;min-width:70px;text-align:right}
.fila-item .acciones{display:flex;gap:4px;opacity:0;transition:opacity .1s ease}
.fila-item:hover .acciones{opacity:1}
@media (hover:none), (max-width:820px){.fila-item .acciones{opacity:1}.fila-item{flex-wrap:wrap}.fila-item .nombre{min-width:180px}.fila-item .meta{margin-left:auto}}
.explorador-vacio{padding:50px 20px;text-align:center;color:var(--texto-tenue)}
.explorador-vacio .icono{color:var(--gris-400);margin:0 auto 12px}

.subida-info{font-size:12.5px;color:var(--texto-tenue);margin-top:8px}

/* --- Visor de archivo --- */
.visor-archivo{background:var(--papel);border:1px solid var(--borde);border-radius:var(--radio);padding:26px}
.visor-archivo video, .visor-archivo audio{width:100%}
.visor-archivo iframe{width:100%;height:75vh;border:none;border-radius:8px}
.visor-archivo img{max-width:100%;border-radius:8px;display:block;margin:0 auto}
.visor-cabecera{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:18px;flex-wrap:wrap}
.visor-descarga{text-align:center;padding:60px 20px}
.visor-descarga .icono{color:var(--gris-400);margin:0 auto 14px}

/* --- Tablas admin --- */
table{width:100%;border-collapse:collapse;background:var(--papel)}
table th, table td{padding:11px 14px;text-align:left;font-size:13.8px;border-bottom:1px solid var(--gris-200)}
table th{background:var(--gris-100);color:var(--tinta-suave);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.03em}
table tr:last-child td{border-bottom:none}
.tabla-envoltorio{border:1px solid var(--borde);border-radius:var(--radio);overflow:hidden}

.etiqueta{display:inline-block;padding:3px 9px;border-radius:99px;font-size:11.5px;font-weight:600}
.etiqueta-admin{background:var(--acento-suave);color:var(--acento-oscuro)}
.etiqueta-alumno{background:var(--verde-suave);color:var(--verde)}
.etiqueta-activo{background:var(--verde-suave);color:var(--verde)}
.etiqueta-inactivo{background:var(--rojo-suave);color:var(--rojo)}

.acciones-fila{display:flex;gap:10px;align-items:center}
.boton-enlace{border:0;background:none;padding:0;color:var(--acento-oscuro);font:inherit;cursor:pointer}
.boton-enlace:hover{text-decoration:underline}
.oculto{display:none!important}
.modal-abierto{overflow:hidden}
.modal-renombrar[hidden]{display:none}
.modal-renombrar{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px}
.modal-renombrar-fondo{position:absolute;inset:0;background:rgba(8,12,18,.62);backdrop-filter:blur(2px)}
.modal-renombrar-panel{position:relative;width:100%;max-width:460px;background:var(--papel);border:1px solid var(--borde);border-radius:var(--radio);box-shadow:0 20px 60px rgba(0,0,0,.28);padding:22px}
.modal-renombrar-cabecera{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:20px}
.modal-renombrar-cabecera h2{font-size:21px;margin:0}
.modal-renombrar-cabecera p{color:var(--texto-tenue);font-size:13.5px;margin:4px 0 0}
.modal-renombrar-acciones{display:flex;justify-content:flex-end;gap:9px;margin-top:20px}
.barra-lote{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px;padding:10px 12px;background:var(--papel);border:1px solid var(--borde);border-radius:var(--radio-chico)}
.barra-lote label{display:flex;align-items:center;gap:7px;font-size:13px}
.barra-lote select{padding:7px 9px;border:1px solid var(--gris-400);border-radius:var(--radio-chico);background:var(--papel);color:var(--texto);font:inherit}
.contador-seleccion{font-size:12.5px;color:var(--texto-tenue)}
.col-seleccion{width:38px;text-align:center!important}
.selector-item{width:18px;height:18px;flex-shrink:0;accent-color:var(--acento)}
@media (max-width:700px){
  .acciones-fila{flex-wrap:wrap}
  .barra-lote{align-items:stretch;flex-direction:column}
  .modal-renombrar{padding:12px;align-items:flex-end}
  .modal-renombrar-panel{max-width:none}
}

.tarjeta{background:var(--papel);border:1px solid var(--borde);border-radius:var(--radio);padding:22px;box-shadow:var(--sombra)}
.dos-columnas{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}
@media (max-width:700px){ .dos-columnas{grid-template-columns:1fr} }

.checklist{display:flex;flex-direction:column;gap:8px;max-height:250px;overflow-y:auto;border:1px solid var(--gris-300);border-radius:var(--radio-chico);padding:10px}
.checklist label{display:flex;align-items:center;gap:8px;font-size:13.3px;font-weight:normal;color:var(--texto)}

.pastilla-stat{background:var(--papel);border:1px solid var(--borde);border-radius:var(--radio);padding:20px 22px;display:flex;flex-direction:column;gap:4px}
.pastilla-stat .rotulo{font-size:12.5px;color:var(--texto-tenue);display:flex;align-items:center;gap:7px}
.pastilla-stat .valor{font-family:'Fraunces',serif;font-size:30px;color:var(--tinta)}

/* =========================================================
   Buscador
   ========================================================= */
.buscador-nav{position:relative;margin-bottom:14px}
.buscador-nav input{
  width:100%;padding:8px 10px 8px 34px;border-radius:var(--radio-chico);border:1px solid var(--gris-300);
  background:var(--gris-100);color:var(--texto);font-size:13.3px;font-family:inherit;
}
.buscador-nav input:focus{outline:2px solid var(--acento);outline-offset:1px;border-color:var(--acento)}
.buscador-nav .icono{position:absolute;left:9px;top:50%;transform:translateY(-50%);color:var(--texto-tenue);pointer-events:none}
@media (max-width:820px){ .nav .buscador-nav{display:block;width:100%} }

.resultados-busqueda{display:flex;flex-direction:column;gap:26px}
.grupo-resultados h3{font-size:14px;text-transform:uppercase;letter-spacing:.04em;color:var(--texto-tenue);font-family:'Inter',sans-serif;font-weight:700;margin-bottom:10px}

/* =========================================================
   Modo claro / oscuro
   ========================================================= */
.boton-tema{
  display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:var(--radio-chico);
  color:var(--texto-tenue);font-size:13.5px;cursor:pointer;background:transparent;border:none;
  font-family:inherit;width:100%;text-align:left;
}
.boton-tema:hover{background:var(--gris-200);color:var(--tinta)}
.boton-tema:focus-visible{outline:2px solid var(--acento);outline-offset:2px}
.icono-luna{display:none}
[data-tema="oscuro"] .icono-sol{display:none}
[data-tema="oscuro"] .icono-luna{display:block}

/* =========================================================
   Explorador: soporte drag-and-drop
   ========================================================= */
.fila-item[draggable="true"]{cursor:grab}
.fila-item.arrastrando{opacity:.4}
.fila-item.zona-destino{background:var(--acento-suave);outline:2px dashed var(--acento);outline-offset:-2px}
.breadcrumb a.zona-destino{background:var(--acento-suave);outline:2px dashed var(--acento);border-radius:6px;padding:2px 6px}
.aviso-arrastre{font-size:12px;color:var(--texto-tenue);margin:10px 0 4px;display:flex;align-items:center;gap:6px}

/* --- Selector de destino (mover archivo/carpeta) --- */
.ruta-mini{font-size:12.5px;color:var(--texto-tenue);background:var(--gris-100);border:1px solid var(--gris-300);border-radius:var(--radio-chico);padding:8px 10px;margin-bottom:14px}

/* =========================================================
   Paleta modo oscuro
   ========================================================= */
[data-tema="oscuro"]{
  --acento: #6FA8E0;
  --acento-oscuro: #8FBEEA;
  --acento-suave: rgba(111,168,224,.16);
  --tinta: #EDF1F6;
  --tinta-suave: #B7C1CD;
  --gris-100: #12161D;
  --gris-200: #1B212A;
  --gris-300: #2A323D;
  --gris-400: #3C4653;
  --papel: #191F28;
  --texto: #E3E8EE;
  --texto-tenue: #8D97A4;
  --verde: #57B98A;
  --verde-suave: rgba(87,185,138,.15);
  --rojo: #E17767;
  --rojo-suave: rgba(225,119,103,.15);
  --borde: #2A323D;
  --sombra: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.25);
}
[data-tema="oscuro"] body{background:var(--gris-100)}
[data-tema="oscuro"] .fila-item .icono-tipo.pdf{background:rgba(224,119,103,.15);color:#E88C7D}
[data-tema="oscuro"] .fila-item .icono-tipo.video{background:rgba(150,120,224,.18);color:#B29CE8}
[data-tema="oscuro"] .fila-item .icono-tipo.audio{background:rgba(224,178,103,.16);color:#E8C08C}
[data-tema="oscuro"] .fila-item .icono-tipo.imagen{background:rgba(103,180,224,.16);color:#8CC4E8}
[data-tema="oscuro"] .fila-item .icono-tipo.documento{background:var(--verde-suave);color:var(--verde)}
[data-tema="oscuro"] .etiqueta-admin{background:var(--acento-suave);color:var(--acento-oscuro)}
[data-tema="oscuro"] .auth-marca{background:linear-gradient(165deg,#0c0f14 0%,#05070a 100%)}

@media (prefers-reduced-motion:no-preference){
  body,.nav,.tarjeta,.tarjeta-curso,.modulo-fila,.explorador,.visor-archivo,
  .campo input,.campo select,.campo textarea,.buscador-nav input{
    transition:background-color .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;
  }
}