/* ═══════════════════════════════════════════════════════════════════════════
   TipDía — Modo Estudio CSS
   assets/estudio.css
   Coherente con el diseño oscuro de TipDía (variables de style.css)
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Pantalla estudio ─────────────────────────────────────────────────────── */
.pantalla-estudio {
    flex: 1;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 24px 20px 64px;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
.estudio-header { margin-bottom: 20px; }
.estudio-header__top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 8px;
}
.estudio-titulo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
}
.estudio-subtitulo {
    color: var(--color-texto-suave);
    font-size: 0.9rem;
    margin-bottom: 10px;
}

/* ── Contador free ───────────────────────────────────────────────────────── */
.estudio-contador-free {
    background: rgba(108,99,255,0.1);
    border: 1px solid rgba(108,99,255,0.2);
    border-radius: 8px;
    padding: 8px 14px;
    font-size: 0.82rem;
    color: var(--color-acento);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
}

/* ── Formulario ──────────────────────────────────────────────────────────── */
.estudio-form-wrap {
    background: var(--color-superficie);
    border: 1px solid var(--color-borde);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
}
.estudio-input-group {
    position: relative;
    margin-bottom: 14px;
}
.estudio-input {
    width: 100%;
    padding: 14px 16px;
    background: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: 10px;
    color: var(--color-texto);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s;
}
.estudio-input:focus {
    outline: none;
    border-color: var(--color-acento);
}
.estudio-chars {
    position: absolute;
    right: 12px;
    bottom: 10px;
    font-size: 0.72rem;
    color: var(--color-texto-suave);
}
.estudio-opciones-row {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 14px;
}
.estudio-opcion-grupo { }
.estudio-opcion-label {
    display: block;
    font-size: 0.78rem;
    color: var(--color-texto-suave);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.estudio-modos {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.estudio-modo-btn,
.estudio-nivel-btn {
    padding: 8px 14px;
    border-radius: 8px;
    border: 1px solid var(--color-borde);
    background: var(--color-fondo);
    color: var(--color-texto);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s;
}
.estudio-modo-btn:hover,
.estudio-nivel-btn:hover {
    border-color: var(--color-acento);
    color: var(--color-acento);
}
.estudio-modo-btn.activo,
.estudio-nivel-btn.activo {
    background: var(--color-acento);
    border-color: var(--color-acento);
    color: #fff;
}
.badge-p {
    display: inline-block;
    font-size: 0.65rem;
    background: rgba(255,200,80,0.2);
    color: #ffc850;
    border-radius: 4px;
    padding: 1px 5px;
    margin-left: 4px;
    vertical-align: middle;
}
.estudio-btn-buscar {
    width: 100%;
    justify-content: center;
    margin-top: 4px;
}

/* ── Resultado ───────────────────────────────────────────────────────────── */
.estudio-resultado {
    margin-top: 8px;
}
.estudio-card {
    background: var(--color-superficie);
    border: 1px solid var(--color-borde);
    border-radius: 16px;
    padding: 22px;
    margin-bottom: 12px;
}
.estudio-card__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}
.estudio-tipo-badge {
    display: inline-block;
    background: rgba(108,99,255,0.15);
    color: var(--color-acento);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}
.estudio-card__titulo {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: #fff;
}
.estudio-card__definicion {
    color: var(--color-texto);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 12px;
}
.estudio-puntos {
    padding-left: 20px;
    margin: 10px 0;
}
.estudio-puntos li {
    color: var(--color-texto);
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 6px;
}
.estudio-ejemplo {
    background: rgba(108,99,255,0.08);
    border-left: 3px solid var(--color-acento);
    padding: 12px 16px;
    border-radius: 0 8px 8px 0;
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--color-texto);
    line-height: 1.6;
}
.estudio-recordar {
    background: rgba(255,200,80,0.08);
    border: 1px solid rgba(255,200,80,0.2);
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 12px;
    font-size: 0.88rem;
    color: #ffc850;
}
.estudio-error {
    background: rgba(255,100,100,0.1);
    border: 1px solid rgba(255,100,100,0.3);
    color: #ff8888;
    padding: 14px 18px;
    border-radius: 10px;
    font-size: 0.9rem;
}
.estudio-free-msg {
    background: rgba(108,99,255,0.08);
    border: 1px solid rgba(108,99,255,0.2);
    border-radius: 8px;
    padding: 10px 14px;
    font-size: 0.82rem;
    color: var(--color-acento);
    margin-bottom: 14px;
}
.estudio-bloque {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--color-borde);
}
.estudio-bloque h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #fff;
}
.estudio-bloque--rojo { border-top-color: rgba(255,100,100,0.3); }
.estudio-bloque--gris { border-top-color: rgba(150,150,150,0.2); }

/* ── Flashcards ──────────────────────────────────────────────────────────── */
.flashcards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
    margin-top: 12px;
}
.flashcard {
    background: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    min-height: 130px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: border-color 0.2s, background 0.2s;
    position: relative;
}
.flashcard:hover { border-color: var(--color-acento); }
.flashcard__frente,
.flashcard__dorso { width: 100%; }
.flashcard__dorso { display: none; }
.flashcard.volteada .flashcard__frente { display: none; }
.flashcard.volteada .flashcard__dorso  { display: block; }
.flashcard.volteada { background: rgba(108,99,255,0.08); border-color: var(--color-acento); }
.flashcard__num {
    font-size: 0.7rem;
    color: var(--color-texto-suave);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    display: block;
}
.flashcard__pregunta {
    font-size: 0.88rem;
    color: var(--color-texto);
    font-weight: 600;
    line-height: 1.5;
}
.flashcard__respuesta {
    font-size: 0.88rem;
    color: var(--color-acento);
    line-height: 1.5;
}
.flashcard__hint {
    font-size: 0.7rem;
    color: var(--color-texto-suave);
    display: block;
    margin-top: 8px;
    text-align: right;
}

/* ── Mnemotécnico ────────────────────────────────────────────────────────── */
.estudio-truco {
    background: rgba(255,200,80,0.07);
    border: 1px solid rgba(255,200,80,0.2);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
}
.estudio-truco__tipo {
    font-size: 0.75rem;
    color: #ffc850;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 8px;
}
.estudio-truco__texto {
    font-size: 1.05rem;
    color: #fff;
    font-weight: 600;
    line-height: 1.5;
}

/* ── Cronología ──────────────────────────────────────────────────────────── */
.cronologia-lista {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-top: 12px;
    position: relative;
    padding-left: 24px;
}
.cronologia-lista::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-borde);
}
.cronologia-evento {
    position: relative;
    padding: 10px 0 10px 16px;
    border-left: none;
}
.cronologia-evento::before {
    content: '';
    position: absolute;
    left: -20px;
    top: 14px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-borde);
}
.cronologia-evento--alta::before { background: var(--color-acento); }
.cronologia-fecha {
    font-size: 0.8rem;
    color: var(--color-acento);
    font-weight: 700;
    margin-bottom: 4px;
}
.cronologia-desc {
    font-size: 0.9rem;
    color: var(--color-texto);
    line-height: 1.5;
}

/* ── Comparativa ─────────────────────────────────────────────────────────── */
.comp-titulos {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}
.comp-a, .comp-b {
    background: rgba(108,99,255,0.1);
    color: var(--color-acento);
    padding: 6px 14px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.9rem;
}
.comp-vs {
    color: var(--color-texto-suave);
    font-size: 0.85rem;
    font-style: italic;
}
.comp-tabla {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}
.comp-tabla th {
    text-align: left;
    padding: 8px 10px;
    color: var(--color-texto-suave);
    border-bottom: 1px solid var(--color-borde);
    font-weight: 600;
}
.comp-tabla td {
    padding: 9px 10px;
    border-bottom: 1px solid var(--color-borde);
    color: var(--color-texto);
    vertical-align: top;
    line-height: 1.5;
}
.comp-aspecto {
    color: var(--color-acento) !important;
    font-weight: 600;
}

/* ── Examen preguntas ────────────────────────────────────────────────────── */
.estudio-pregunta {
    margin-bottom: 12px;
    padding: 12px 14px;
    background: var(--color-fondo);
    border-radius: 8px;
    border: 1px solid var(--color-borde);
}
.estudio-pregunta__q {
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--color-texto);
}
.estudio-pregunta__details {
    font-size: 0.85rem;
    color: var(--color-acento);
}
.estudio-pregunta__details summary {
    cursor: pointer;
    color: var(--color-texto-suave);
    font-size: 0.8rem;
}
.estudio-pregunta__details p {
    margin-top: 6px;
    color: var(--color-texto);
    line-height: 1.5;
}

/* ── Upgrade pantalla ────────────────────────────────────────────────────── */
.estudio-upgrade {
    background: var(--color-superficie);
    border: 1px solid var(--color-borde);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    margin-top: 12px;
}
.estudio-upgrade__icon { font-size: 2.5rem; margin-bottom: 12px; }
.estudio-upgrade__titulo {
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}
.estudio-upgrade__desc {
    color: var(--color-texto-suave);
    font-size: 0.9rem;
    margin-bottom: 10px;
}
.estudio-upgrade__precio {
    color: var(--color-texto);
    font-size: 1rem;
    margin-bottom: 18px;
}
.estudio-upgrade__btn {
    display: inline-block;
    text-decoration: none;
    margin: 4px;
}
.estudio-upgrade__volver {
    margin-top: 14px;
    font-size: 0.82rem;
    color: var(--color-texto-suave);
    background: none;
    border: 1px solid var(--color-borde);
}

/* ── Límite free ─────────────────────────────────────────────────────────── */
.estudio-limite {
    text-align: center;
    padding: 32px 24px;
}
.estudio-limite__icon { font-size: 2.5rem; margin-bottom: 12px; }
.estudio-limite h3 { font-size: 1.1rem; margin-bottom: 10px; color: #fff; }
.estudio-limite p  { color: var(--color-texto-suave); font-size: 0.9rem; }

/* ── Asignaturas ─────────────────────────────────────────────────────────── */
.estudio-asignaturas {
    margin-top: 24px;
    background: var(--color-superficie);
    border: 1px solid var(--color-borde);
    border-radius: 14px;
    padding: 18px;
}
.estudio-asig-titulo {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: #fff;
}
.estudio-asig-lista { display: flex; flex-direction: column; gap: 8px; }
.estudio-asig-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    background: var(--color-fondo);
    border-radius: 8px;
    font-size: 0.88rem;
}
.estudio-asig-nombre { font-weight: 600; color: var(--color-texto); }
.estudio-asig-count  { color: var(--color-texto-suave); font-size: 0.78rem; }
.estudio-asig-nueva  { margin-top: 10px; }

/* ── Botón header estudio ────────────────────────────────────────────────── */
.btn--estudio {
    background: rgba(108,99,255,0.1);
    color: var(--color-acento);
    border: 1px solid var(--color-acento);
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
    .pantalla-estudio { padding: 16px 12px 48px; }
    .estudio-titulo   { font-size: 1.2rem; }
    .flashcards-grid  { grid-template-columns: 1fr; }
    .comp-titulos     { flex-direction: column; align-items: flex-start; }
    .estudio-upgrade__btn { display: block; width: 100%; box-sizing: border-box; }

    /* Botón estudio compacto en móvil */
    #btn-estudio {
        font-size: 0.74rem;
        padding: 5px 9px;
    }
}

/* ── Asignaturas expandibles (añadido) ───────────────────────────────────── */
.estudio-asig-bloque {
    background: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: 10px;
    margin-bottom: 8px;
    overflow: hidden;
}
.estudio-asig-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    cursor: pointer;
    transition: background 0.15s;
    flex-wrap: wrap;
}
.estudio-asig-header:hover { background: rgba(108,99,255,0.06); }
.estudio-asig-icono   { font-size: 1rem; }
.estudio-asig-nombre  { font-weight: 600; color: var(--color-texto); font-size: 0.9rem; flex: 1; }
.estudio-asig-count   { font-size: 0.75rem; color: var(--color-texto-suave); }
.asig-chevron         { font-size: 0.7rem; color: var(--color-texto-suave); transition: transform 0.2s; }
.asig-btn-borrar      { margin-left: auto; opacity: 0.5; }
.asig-btn-borrar:hover{ opacity: 1; }

.estudio-asig-temas {
    padding: 4px 14px 12px;
    border-top: 1px solid var(--color-borde);
}
.asig-tema-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    flex-wrap: wrap;
}
.asig-tema-item:last-child { border-bottom: none; }
.asig-tema-icono  { font-size: 0.9rem; }
.asig-tema-nombre {
    flex: 1;
    font-size: 0.87rem;
    color: var(--color-texto);
    min-width: 120px;
}
.asig-tema-meta {
    font-size: 0.72rem;
    color: var(--color-texto-suave);
}
.asig-tema-btns { display: flex; gap: 4px; }

/* ── Formulario nueva asignatura inline ──────────────────────────────────── */
#form-nueva-asig {
    background: rgba(108,99,255,0.06);
    border: 1px solid rgba(108,99,255,0.2);
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 10px;
}

/* ── Badges de modos cacheados en asignaturas ────────────────────────────── */
.asig-cache-badges {
    display: flex;
    gap: 3px;
    align-items: center;
}
.asig-modo-badge {
    display: inline-block;
    font-size: 0.8rem;
    background: rgba(108,99,255,0.15);
    border: 1px solid rgba(108,99,255,0.25);
    border-radius: 4px;
    padding: 1px 5px;
    cursor: default;
    line-height: 1.4;
}
.asig-modo-badge:hover {
    background: rgba(108,99,255,0.3);
}

/* ── Botón Regenerar ─────────────────────────────────────────────────────── */
.estudio-btn-regenerar {
    font-size: 0.75rem;
    padding: 4px 10px;
    opacity: 0.7;
    margin-bottom: 10px;
    display: inline-block;
}
.estudio-btn-regenerar:hover {
    opacity: 1;
}

/* ── Hint de respuestas en examen ────────────────────────────────────────── */
.estudio-hint-respuestas {
    font-size: 0.78rem;
    color: var(--color-texto-suave);
    font-style: italic;
    margin-bottom: 10px;
}
.estudio-pregunta__ver {
    cursor: pointer;
    color: var(--color-acento);
    font-size: 0.82rem;
    padding: 4px 0;
    list-style: none;
    user-select: none;
}
.estudio-pregunta__ver:hover { opacity: 0.8; }
.estudio-pregunta__resp {
    margin-top: 8px;
    padding: 8px 12px;
    background: rgba(108,99,255,0.08);
    border-left: 3px solid var(--color-acento);
    border-radius: 0 6px 6px 0;
    font-size: 0.9rem;
    color: var(--color-texto);
    line-height: 1.5;
}

/* ── @page — márgenes y evitar página en blanco extra en Chrome Android ─────── */
@page {
    margin: 1.2cm 1.5cm;
    size: auto;
}

/* ── @media print — impresión en PC y móvil (todos los navegadores) ──────────── */
@media print {
    /* Evitar página en blanco extra */
    html, body {
        height: auto !important;
        overflow: visible !important;
        min-height: 0 !important;
    }

    /* PASO 1: Forzar visibilidad — en móvil estas pantallas tienen display:none */
    #pantalla-estudio,
    #estudio-resultado,
    #pantalla-estudio .estudio-card,
    #pantalla-estudio .estudio-bloque,
    #pantalla-estudio .estudio-puntos,
    #pantalla-estudio .estudio-pregunta,
    #pantalla-estudio .estudio-recordar,
    #pantalla-estudio .cronologia-lista,
    #pantalla-estudio .cronologia-evento,
    #pantalla-estudio .comp-tabla,
    #pantalla-estudio .flashcard,
    #pantalla-estudio details,
    #pantalla-estudio details > p,
    #estudio-pie-impresion {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
    #pantalla-estudio .flashcards-grid {
        display: grid !important;
    }

    /* PASO 2: Ocultar todo lo que NO es el resultado */
    body > *:not(#pantalla-estudio) { display: none !important; }
    #pantalla-estudio > *:not(#estudio-resultado) { display: none !important; }

    /* Ocultar elementos de UI dentro del resultado */
    .btn-audio,
    .btn-guardar-asig,
    .btn-imprimir-estudio,
    .estudio-btn-regenerar,
    .estudio-asignaturas,
    #estudio-asignaturas,
    .estudio-hint-respuestas,
    .estudio-tipo-badge,
    .badge-p,
    .asig-cache-badges,
    .estudio-card__header,
    .estudio-examen-btns,
    .estudio-loading,
    header, footer, nav { display: none !important; }

    /* PASO 3: Abrir todas las respuestas */
    details > summary { display: none !important; }
    details > p { display: block !important; }

    /* PASO 4: Fondo blanco, texto negro */
    * {
        background: #fff !important;
        color: #000 !important;
        box-shadow: none !important;
        border-color: #ccc !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    /* PASO 5: Pie — se inserta via JS (más fiable que ::after en todos los navegadores) */
    #estudio-pie-impresion {
        text-align: center !important;
        font-size: 9pt !important;
        color: #888 !important;
        margin-top: 20pt !important;
        padding-top: 8pt !important;
        border-top: 1pt solid #ccc !important;
    }

    /* Tipografía */
    body  { font-family: Georgia, serif; font-size: 12pt; }
    h3    { font-size: 14pt; font-weight: bold; margin-bottom: 8pt; }
    h4    { font-size: 13pt; margin: 10pt 0 5pt; border-bottom: 1pt solid #000; }
    li, p { font-size: 11pt; line-height: 1.6; margin-bottom: 4pt; }
    strong { font-weight: bold; }

    /* Tarjeta principal sin bordes ni padding extra */
    .estudio-card { border: none !important; padding: 0 !important; }

    /* Preguntas del examen */
    .estudio-pregunta {
        border: 1pt solid #ccc !important;
        padding: 8pt !important;
        margin-bottom: 8pt !important;
        page-break-inside: avoid;
    }
    .estudio-pregunta__resp {
        border-left: 3pt solid #555 !important;
        padding: 4pt 8pt !important;
        margin-top: 4pt !important;
        background: #f9f9f9 !important;
    }

    /* Cronología */
    .cronologia-fecha { font-weight: bold; }
    .cronologia-evento { padding: 6pt 0 !important; border-bottom: 1pt dotted #ccc !important; }
    .cronologia-lista::before { display: none !important; }

    /* Flashcards */
    .flashcard { border: 1pt solid #ccc !important; page-break-inside: avoid; padding: 8pt !important; }
    .flashcard__dorso  { display: block !important; }
    .flashcard__frente { display: block !important; }
    .flashcard__hint   { display: none !important; }

    /* Recordar y ejemplos */
    .estudio-recordar { border: 1pt solid #999 !important; padding: 6pt !important; }
    .estudio-ejemplo  { border-left: 3pt solid #555 !important; padding: 6pt 10pt !important; }

    /* Evitar cortes de página dentro de bloques */
    .estudio-bloque { page-break-inside: avoid; }
    .cronologia-evento { page-break-inside: avoid; }
}

/* ── Botones pie del examen (guardar + imprimir) — visibles en móvil y PC ── */
.estudio-examen-btns {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 14px;
}
.estudio-examen-btns .btn {
    flex: 1;
    min-width: 140px;
    justify-content: center;
    text-align: center;
}
@media (max-width: 480px) {
    .estudio-examen-btns {
        flex-direction: column;
    }
    .estudio-examen-btns .btn {
        width: 100%;
    }
}

/* ── Animación de carga IA ────────────────────────────────────────────────── */
.estudio-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    text-align: center;
}
.estudio-loading__dots {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}
.estudio-loading__dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-acento);
    animation: estudio-bounce 1.2s ease-in-out infinite;
}
.estudio-loading__dots span:nth-child(2) { animation-delay: 0.2s; }
.estudio-loading__dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes estudio-bounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40%            { transform: scale(1.0); opacity: 1.0; }
}

.estudio-loading__texto {
    font-size: 0.95rem;
    color: var(--color-texto);
    font-weight: 600;
    margin-bottom: 6px;
}
.estudio-loading__sub {
    font-size: 0.8rem;
    color: var(--color-texto-suave);
}

/* ── Modo Para niños — visual diferenciado ───────────────────────────────── */
.estudio-card--ninos {
    border-color: rgba(255, 180, 0, 0.35) !important;
    background: linear-gradient(
        135deg,
        var(--color-superficie) 0%,
        rgba(255, 180, 0, 0.04) 100%
    ) !important;
}

.estudio-tipo-badge--ninos {
    background: rgba(255, 180, 0, 0.18) !important;
    color: #ffb400 !important;
    border: 1px solid rgba(255, 180, 0, 0.3);
}

.estudio-ninos__definicion {
    font-size: 1rem !important;
    line-height: 1.8 !important;
}

.estudio-ninos__lista li {
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 8px;
}

.estudio-ninos__ejemplo {
    border-left-color: #ffb400 !important;
    background: rgba(255, 180, 0, 0.06) !important;
}

.estudio-ninos__recordar {
    background: rgba(255, 180, 0, 0.08) !important;
    border-color: rgba(255, 180, 0, 0.25) !important;
    color: #ffb400 !important;
}

/* ── @media print: modo niños — forzar colores legibles igual que el resto ── */
@media print {
    .estudio-card--ninos {
        background: #fff !important;
        border-color: #ccc !important;
    }
    .estudio-tipo-badge--ninos {
        background: #f0f0f0 !important;
        color: #000 !important;
        border-color: #ccc !important;
    }
    .estudio-ninos__ejemplo {
        background: #f9f9f9 !important;
        border-left-color: #555 !important;
        color: #000 !important;
    }
    .estudio-ninos__recordar {
        background: #f9f9f9 !important;
        border-color: #ccc !important;
        color: #000 !important;
    }
    .estudio-ninos__lista li,
    .estudio-ninos__definicion {
        color: #000 !important;
    }
}

/* ══════════════════════════════════════════════════════════════════════════════
   NUEVAS FUNCIONALIDADES V51
   ══════════════════════════════════════════════════════════════════════════════ */

/* ── 1. LEITNER — botones y badges ─────────────────────────────────────────── */
.leitner-btns {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-top: 14px;
    flex-wrap: wrap;
}
.btn-leitner {
    padding: 7px 16px;
    border: none;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: transform 0.15s, opacity 0.15s;
}
.btn-leitner:hover { transform: scale(1.04); opacity: 0.9; }
.btn-leitner-dificil { background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; }
.btn-leitner-facil   { background: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }

.leitner-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 12px;
    margin-bottom: 4px;
    letter-spacing: 0.02em;
}
.leitner-badge--dificil { background: #fef3c7; color: #92400e; border: 1px solid #fcd34d; }
.leitner-badge--facil   { background: #d1fae5; color: #065f46; border: 1px solid #6ee7b7; }

/* ── 2. GLOSARIO ────────────────────────────────────────────────────────────── */
.estudio-glosario-resultado {
    margin-top: 16px;
}
.estudio-glosario-box {
    background: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: 12px;
    padding: 16px;
}
.glosario-titulo {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-acento);
    margin: 0 0 12px;
}
.glosario-lista {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.glosario-termino {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 8px 14px;
    align-items: baseline;
    padding: 8px 0;
    border-bottom: 1px solid var(--color-borde);
}
.glosario-termino:last-child { border-bottom: none; }
.glosario-term {
    font-weight: 700;
    color: var(--color-acento);
    font-size: 0.9rem;
}
.glosario-def {
    color: var(--color-texto);
    font-size: 0.88rem;
    line-height: 1.5;
}
.btn-glosario {
    background: var(--color-fondo) !important;
    border: 1px solid var(--color-acento) !important;
    color: var(--color-acento) !important;
}
.btn-glosario:hover { background: rgba(108,99,255,0.08) !important; }
.estudio-loading-mini {
    font-size: 0.85rem;
    color: var(--color-texto-suave);
    padding: 8px 0;
    text-align: center;
}

/* ── 3. MODO DEBATE ─────────────────────────────────────────────────────────── */
.debate-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 16px 0;
}
@media (max-width: 600px) {
    .debate-grid { grid-template-columns: 1fr; }
}
.debate-posicion {
    border-radius: 12px;
    padding: 14px;
    border: 1px solid var(--color-borde);
}
.debate-posicion--a {
    background: rgba(59,130,246,0.06);
    border-color: rgba(59,130,246,0.25);
}
.debate-posicion--b {
    background: rgba(239,68,68,0.06);
    border-color: rgba(239,68,68,0.25);
}
.debate-posicion__header {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: var(--color-texto);
}
.debate-cierre {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--color-texto-suave);
    border-top: 1px dashed var(--color-borde);
    padding-top: 8px;
}

/* ── 4. EXPLÍCAME MÁS SIMPLE ────────────────────────────────────────────────── */
.estudio-puntos--explicar li {
    position: relative;
    padding-right: 0;
}
.estudio-punto-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.btn-explicar-simple {
    align-self: flex-start;
    background: none;
    border: 1px solid var(--color-borde);
    border-radius: 14px;
    padding: 3px 10px;
    font-size: 0.75rem;
    color: var(--color-texto-suave);
    cursor: pointer;
    font-family: inherit;
    transition: background 0.15s, color 0.15s;
    margin-top: 4px;
}
.btn-explicar-simple:hover {
    background: var(--color-acento);
    color: #fff;
    border-color: var(--color-acento);
}
.btn-explicar-simple:disabled { opacity: 0.5; cursor: wait; }

.explicar-simple-panel {
    background: rgba(108,99,255,0.05);
    border: 1px solid rgba(108,99,255,0.2);
    border-radius: 10px;
    padding: 12px 14px;
    margin-top: 8px;
    font-size: 0.87rem;
}
.explicar-simple-content { display: flex; flex-direction: column; gap: 6px; }
.explicar-simple-texto { color: var(--color-texto); line-height: 1.55; margin: 0; }
.explicar-simple-ejemplo { color: var(--color-texto-suave); font-style: italic; margin: 0; }
.explicar-simple-cerrar {
    align-self: flex-end;
    background: none;
    border: 1px solid var(--color-borde);
    border-radius: 10px;
    padding: 3px 10px;
    font-size: 0.75rem;
    cursor: pointer;
    color: var(--color-texto-suave);
    font-family: inherit;
}
.explicar-simple-cerrar:hover { background: var(--color-borde); }

/* ── 5. RESUMEN EXAMEN ──────────────────────────────────────────────────────── */
.estudio-resumen-examen {
    margin-top: 16px;
}
.resumen-examen-box {
    background: var(--color-fondo);
    border: 1px solid var(--color-borde);
    border-radius: 12px;
    padding: 16px;
}
.resumen-examen-titulo {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 6px;
    color: var(--color-texto);
}
.resumen-examen-desc {
    font-size: 0.82rem;
    color: var(--color-texto-suave);
    margin: 0 0 14px;
}
.resumen-pregunta {
    padding: 10px 0;
    border-bottom: 1px solid var(--color-borde);
}
.resumen-pregunta:last-child { border-bottom: none; }
.resumen-pregunta__q {
    font-weight: 600;
    color: #ef4444;
    margin: 0 0 4px;
    font-size: 0.9rem;
}
.resumen-pregunta__r {
    color: var(--color-texto);
    margin: 0;
    font-size: 0.87rem;
    line-height: 1.5;
}
.resumen-examen-ok {
    color: #10b981;
    font-weight: 600;
    font-size: 0.95rem;
    text-align: center;
    padding: 8px 0;
}
.btn-resumen-examen {
    background: rgba(16,185,129,0.08) !important;
    border: 1px solid rgba(16,185,129,0.3) !important;
    color: #059669 !important;
}
.btn-resumen-examen:hover { background: rgba(16,185,129,0.15) !important; }

/* ── Print: ocultar nuevos elementos interactivos ─────────────────────────── */
@media print {
    .btn-leitner, .leitner-btns,
    .btn-explicar-simple, .explicar-simple-panel,
    .btn-glosario, .estudio-glosario-resultado,
    .btn-resumen-examen, .estudio-resumen-examen { display: none !important; }
    .debate-grid { grid-template-columns: 1fr 1fr; }
    .glosario-termino { grid-template-columns: 150px 1fr; }
}

/* ── Responsive glosario ────────────────────────────────────────────────────── */
@media (max-width: 480px) {
    .glosario-termino {
        grid-template-columns: 1fr;
        gap: 2px;
    }
    .glosario-term { font-size: 0.88rem; }
}