/* ===============================================================
   FLASHCARDS CSS - Sistema de Estudio con Tarjetas
   BarberMaster AI - Preparación Examen Estatal PSI
   
   ARCHIVO CONSOLIDADO: Todos los estilos de flashcards aquí
   =============================================================== */

/* ===============================================================
   1. MODO PANTALLA COMPLETA (Fullscreen Mode)
   Cuando el usuario entra en modo flashcards, oculta sidebar y
   expande el contenido a 100% del viewport
   =============================================================== */

/* Cuando el body tiene theme-flashcards activo */
body.theme-flashcards {
    /* Sin overflow:hidden — permite scroll en mobile si el contenido es más alto que la pantalla */
}

/* Mismo tratamiento para exam — Vista Integrada: sidebar visible, layout natural */
body.theme-exam {
    /* Sin overflow:hidden — permite scroll si el contenido excede la pantalla */
}

/* Mismo tratamiento para quiz — Vista Integrada: sidebar visible, layout natural */
body.theme-quiz {
    /* Sin overflow:hidden — permite scroll si el contenido excede la pantalla */
}
body.theme-quiz .main-content>.screen {
    display: none;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
}

/* Ocultar otras pantallas cuando flashcards está activo */
body.theme-flashcards .main-content>.screen {
    display: none;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
}

/* Content viewport por defecto está oculto */
.content-viewport {
    display: none;
}

/* Cuando está activo, se integra en el layout principal */
/* FIX: el JS agrega active-mode a #mainContentArea, no a .content-viewport */
.content-viewport.active-mode,
#mainContentArea.active-mode {
    display: block;
    position: relative;
    width: 100%;
    min-height: 100%;
    height: auto;
    overflow: visible;
    background: var(--bg-deep-space, #0f172a);
    z-index: 1;
    padding: 0;
}


/* ===============================================================
   2. HUB DE SELECCIÓN DE TEMAS
   Pantalla inicial donde el usuario elige un tema para estudiar
   =============================================================== */

.flashcard-hub {
    text-align: center;
    padding: 1.5rem 2rem 2rem;
    min-height: 100vh;
    box-sizing: border-box;
    max-width: 1200px;
    margin: 0 auto;
}

.hub-header {
    margin-bottom: 2rem;
}

.hub-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    font-family: var(--font-display, 'Outfit', sans-serif);
}

.hub-header p {
    color: var(--text-muted, #cbd5e1);
    font-size: 1rem;
}

.hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.hub-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.hub-card:hover {
    transform: translateY(-5px);
    border-color: var(--neon-cyan, #06b6d4);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 10px 30px rgba(6, 182, 212, 0.15);
}

.hub-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hub-card h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

/* ===============================================================
   3. CONTENEDOR PRINCIPAL DE FLASHCARDS
   Estructura que envuelve toda la experiencia de estudio
   =============================================================== */

.flashcard-container {
    perspective: 1000px;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    min-height: auto;
    /* Antes 100vh - Reducido para evitar scroll innecesario */
    padding: 0;
    box-sizing: border-box;
}

/* Header con título, estadísticas y controles */
.fc-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.3);
    gap: 1rem;
    box-sizing: border-box;
}

/* ===============================================================
   4. TARJETA 3D FLIP (Scene & Card Object)
   Sistema de tarjeta con efecto de volteo 3D
   =============================================================== */

.scene {
    width: 100%;
    max-width: 550px;
    min-height: 400px;
    perspective: 1000px;
    margin: 1rem auto;
}

.card-object {
    width: 100%;
    min-height: 400px;
    position: relative;
    transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
    transform-style: preserve-3d;
    cursor: pointer;
    /* NUEVO: Grid layout para altura dinámica */
    display: grid;
    grid-template-columns: 1fr;
}

.card-object.is-flipped {
    transform: rotateY(180deg);
}

.card-face {
    /* NUEVO: Grid positioning en lugar de absolute */
    grid-area: 1 / 1;
    position: relative;
    width: 100%;
    min-height: 400px;
    /* top: 0; left: 0; eliminados */

    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 1.5rem;
    box-sizing: border-box;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(26, 31, 58, 0.98);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.card-front {
    z-index: 2;
    transform: rotateY(0deg);
    /* Asegurar posición inicial */
}

.card-back {
    transform: rotateY(180deg);
    z-index: 1;
    background: linear-gradient(145deg, rgba(0, 224, 150, 0.1), rgba(26, 31, 58, 0.98));
    border-color: rgba(0, 224, 150, 0.3);
}

.card-label {
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 2px;
    margin-bottom: 1rem;
    opacity: 0.7;
    font-weight: 600;
    color: var(--neon-cyan, #06b6d4);
}

.fc-text {
    font-size: 1.15rem;
    line-height: 1.5;
    text-align: center;
    margin-bottom: 1rem;
}

.fc-explanation {
    font-size: 0.95rem;
    opacity: 0.9;
    background: rgba(0, 0, 0, 0.25);
    padding: 1rem;
    border-radius: 12px;
    margin-top: 1rem;
    line-height: 1.5;
    max-width: 100%;
}

.tap-hint {
    font-size: 0.8rem;
    opacity: 0.6;
    margin-top: 1rem;
}

/* ===============================================================
   5. OPCIONES DE RESPUESTA
   Botones de selección múltiple
   =============================================================== */

.options-grid-vertical {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-main, #f8fafc);
    padding: 0.875rem 1rem;
    border-radius: 12px;
    font-size: 0.9rem;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.option-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--neon-cyan, #06b6d4);
}

.option-btn.selected {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--neon-cyan, #06b6d4);
    font-weight: 600;
}

/* Estado: Respuesta correcta */
.option-btn.correct,
.option-btn.correct-anim {
    background: linear-gradient(135deg, rgba(0, 224, 150, 0.2), rgba(0, 179, 119, 0.15));
    border-color: #00E096;
    color: #00E096;
    box-shadow: 0 0 15px rgba(0, 224, 150, 0.3);
}

/* Estado: Respuesta incorrecta */
.option-btn.wrong,
.option-btn.wrong-anim {
    background: rgba(255, 61, 113, 0.15);
    border-color: #FF3D71;
    color: #FF3D71;
    animation: shake 0.4s cubic-bezier(.36, .07, .19, .97) both;
}

/* ===============================================================
   6. CONTROLES DE NAVEGACIÓN
   Botones prev/next y otras acciones
   =============================================================== */

.fc-controls {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 500px;
    width: 100%;
}

.flashcards-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
    max-width: 400px;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
}

/* ===============================================================
   7. ANIMACIONES Y EFECTOS
   =============================================================== */

/* Animación de shake para respuestas incorrectas */
@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-4px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(4px);
    }
}

/* Confetti animation */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    animation: fall linear forwards;
    z-index: 2000;
    pointer-events: none;
}

@keyframes fall {
    to {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* Toast de motivación */
.motivation-toast {
    position: fixed;
    bottom: 20%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.85);
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    z-index: 2000;
    animation: fadeInOut 2s forwards;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

@keyframes fadeInOut {
    0% {
        opacity: 0;
        transform: translate(-50%, 20px);
    }

    15% {
        opacity: 1;
        transform: translate(-50%, 0);
    }

    85% {
        opacity: 1;
        transform: translate(-50%, 0);
    }

    100% {
        opacity: 0;
        transform: translate(-50%, -20px);
    }
}

/* ===============================================================
   8. PANTALLA DE RESULTADOS
   Estadísticas al finalizar la sesión
   =============================================================== */

.results-container {
    text-align: center;
    padding: 2rem;
    max-width: 600px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.results-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.results-container h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.stats-summary {
    margin: 2rem 0;
}

.stat-big .stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary, linear-gradient(135deg, #06b6d4, #3b82f6));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-big .stat-label {
    font-size: 1rem;
    opacity: 0.7;
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

/* ===============================================================
   9. RESPONSIVE - Móviles y tablets
   =============================================================== */

@media (max-width: 768px) {
    .hub-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .hub-card {
        padding: 1rem;
    }

    .hub-icon {
        font-size: 2rem;
    }

    .scene {
        max-width: 100%;
        min-height: 350px;
        margin: 0.5rem;
    }

    .card-face {
        min-height: 350px;
        padding: 1rem;
    }

    .fc-text {
        font-size: 1rem;
    }

    .option-btn {
        padding: 0.75rem;
        font-size: 0.85rem;
    }

    .fc-header {
        padding: 0.75rem 1rem;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .fc-header > div:first-child {
        min-width: 120px;
    }

    .flashcard-hub {
        padding: 1rem;
    }

    .results-container {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .hub-grid {
        grid-template-columns: 1fr;
    }

    .scene {
        min-height: 300px;
    }

    .card-face {
        min-height: 300px;
        padding: 0.75rem;
    }

    .fc-text {
        font-size: 0.95rem;
    }

    .option-btn {
        padding: 0.6rem;
        font-size: 0.8rem;
    }

    .fc-controls {
        flex-direction: column;
    }

    .fc-controls .btn {
        width: 100%;
    }

    .fc-header h2 {
        font-size: 0.95rem;
    }

    .flashcard-container {
        min-height: auto;
    }
}

/* ===============================================================
   PREMIUM FLASHCARD ENHANCEMENTS
   =============================================================== */

/* Hub Premium Card */
.hub-card-premium {
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0.2, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.hub-card-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--hub-color, #3b82f6), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.hub-card-premium:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--hub-color, #3b82f6);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 30px var(--hub-glow, rgba(59, 130, 246, 0.2));
}

.hub-card-premium:hover::before {
    opacity: 1;
}

.hub-icon-premium {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.hub-card-premium:hover .hub-icon-premium {
    transform: scale(1.1) rotate(-5deg);
    border-color: var(--hub-color, #3b82f6);
}

/* Flashcard Premium Scene */
.scene-premium {
    width: 100%;
    max-width: 600px;
    min-height: 450px;
    perspective: 1200px;
    margin: 1.5rem auto;
}

.card-object-premium {
    width: 100%;
    min-height: 450px;
    position: relative;
    transition: transform 0.8s cubic-bezier(0.4, 0.2, 0.2, 1);
    transform-style: preserve-3d;
    cursor: pointer;
}

.card-face-premium {
    position: absolute;
    width: 100%;
    min-height: 450px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    border-radius: 24px;
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.95), rgba(15, 23, 42, 0.98));
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5), 0 0 40px rgba(59, 130, 246, 0.1);
}

.card-back-premium {
    transform: rotateY(180deg);
    background: linear-gradient(145deg, rgba(16, 185, 129, 0.1), rgba(15, 23, 42, 0.98));
    border-color: rgba(16, 185, 129, 0.3);
}

/* Premium Controls */
.fc-controls-premium {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 600px;
    width: 100%;
}

.fc-btn-premium {
    padding: 1rem 2rem;
    border-radius: 16px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: none;
}

.fc-btn-primary {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: #fff;
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.fc-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(59, 130, 246, 0.4);
}

.fc-btn-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: #fff;
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
}

.fc-btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(16, 185, 129, 0.4);
}

.fc-btn-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff;
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.3);
}

.fc-btn-warning:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(245, 158, 11, 0.4);
}

/* Premium Results */
.results-container-premium {
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem;
    background: linear-gradient(145deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.6s ease;
}

.results-score {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.results-message {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.results-stat {
    padding: 1.25rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 16px;
    text-align: center;
}

.results-stat-value {
    font-size: 2rem;
    font-weight: 700;
}

.results-stat-value.correct { color: #10b981; }
.results-stat-value.incorrect { color: #ef4444; }