/* Reset básico y fuentes */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Lato', sans-serif;
    line-height: 1.6;
    background-color: #fdfcfa; /* Blanco Crema Muy Suave */
    color: #4a4a4a; /* Gris Oscuro - Texto principal */
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Cormorant Garamond', serif;
    font-weight: 700;
    color: #333; /* Gris Profundo - Títulos */
}

/* Paleta de Colores Específica del Usuario */
:root {
    --color-background: #fdfcfa;
    --color-surface: #ffffff;
    --color-text-primary: #4a4a4a;
    --color-text-title: #333;
    --color-text-nav-button: #5a5a5a; /* Gris Medio botones nav */
    --color-border-subtle: #e0e0e0;
    --color-border-interactive: #ccc; /* Usaremos #ccc como base */
    --color-border-interactive-alt: #ddd;

    /* Acentos Angelicales y Lujosos */
    --color-accent-lila: #e0c3fc;
    --color-accent-lila-pale: #f0eaf6;
    --color-accent-sky-blue: #8ec5fc;
    --color-accent-blue-pale: #f0f8ff; /* AliceBlue */
    --color-accent-gold: #b08d57; /* Dorado/Bronce Apagado */
    --gradient-header: linear-gradient(to right, var(--color-accent-lila), var(--color-accent-sky-blue));

    /* Feedback */
    --color-correct-bg: #d4edda;
    --color-correct-text: #155724;
    --color-correct-border: #c3e6cb;
    --color-incorrect-bg: #f8d7da;
    --color-incorrect-text: #721c24;
    --color-incorrect-border: #f5c6cb;

    /* Loading/Error */
    --color-error-bg: var(--color-incorrect-bg);
    --color-error-text: var(--color-incorrect-text);
    --color-error-border: var(--color-incorrect-border);
}

/* Header */
.main-header {
    background: var(--gradient-header);
    color: var(--color-surface); /* Texto blanco sobre gradiente */
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.main-header .logo {
    font-family: var(--font-title);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-surface); /* Logo en blanco para contraste */
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1); /* Sombra sutil al logo */
}

.streak-counter {
    font-size: 1rem;
    font-weight: bold;
    background-color: rgba(255, 255, 255, 0.2); /* Fondo semi-transparente */
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    color: var(--color-surface);
}

/* Main Content Area */
.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 900px;
    margin: 2rem auto;
    background-color: var(--color-surface); /* Fondo blanco */
    border-radius: 10px;
    box-shadow: 0 8px 25px rgba(100, 100, 100, 0.1); /* Sombra suave gris */
    border: 1px solid var(--color-border-subtle); /* Borde gris claro */
    position: relative; /* Para posicionar error absoluto si es necesario */
}

/* Vistas */
.view { display: none; }
.view.active-view { display: block; animation: fadeIn 0.5s ease-in-out; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* Loading View Styles */
#loading-view p {
    text-align: center;
    padding: 3rem;
    font-size: 1.2rem;
    color: var(--color-text-nav-button);
}

/* Error Message Styles */
.error-message {
    color: var(--color-error-text);
    background-color: var(--color-error-bg);
    border: 1px solid var(--color-error-border);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    margin: 1rem; /* Margen dentro del contenedor principal */
}
.error-message h2 {
    color: var(--color-error-text);
    margin-bottom: 1rem;
}
.error-message p {
    margin-bottom: 0.5rem;
    line-height: 1.5;
}
.error-message p i {
    font-size: 0.9em;
    color: var(--color-text-nav-button);
}


/* Lesson Selection */
.lesson-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.lesson-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border-interactive-alt); /* Borde ddd */
    border-radius: 8px;
    padding: 1.5rem;
    text-align: left;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    /* Borde lateral dorado para toque lujoso */
    border-left: 5px solid var(--color-accent-gold);
    position: relative; /* Para posicionar badges */
}

.lesson-card h3 {
    font-family: var(--font-title);
    color: var(--color-text-title); /* Título gris profundo */
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.lesson-card p {
    font-size: 0.9rem;
    color: var(--color-text-nav-button); /* Descripción gris medio */
    margin-bottom: 1rem;
}

.lesson-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(180, 141, 87, 0.15); /* Sombra con toque dorado */
    background-color: var(--color-accent-lila-pale); /* Fondo lila pálido al pasar */
}

/* Estilos para badges en tarjetas */
.completed-badge, .coming-soon-badge {
    display: inline-block; /* O block si se prefiere en línea separada */
    margin-top: 10px;
    font-weight: bold;
    font-size: 0.85rem;
    padding: 3px 8px;
    border-radius: 4px;
}

.completed-badge {
    color: #ffffff; /* Texto blanco */
    background-color: var(--color-accent-gold); /* Fondo dorado */
}

.coming-soon-badge {
    color: #666; /* Gris oscuro */
    background-color: #eee; /* Gris muy claro */
}

/* Estilos para tarjeta deshabilitada */
.lesson-card-disabled {
    opacity: 0.6;
    background-color: #f9f9f9;
    border-left-color: var(--color-border-interactive-alt);
    cursor: not-allowed;
}
.lesson-card-disabled:hover {
    transform: none;
    box-shadow: none;
    background-color: #f9f9f9;
}


/* Lesson View */
#lesson-view { position: relative; }

.back-button {
    position: absolute;
    top: -10px; /* Ajusta según sea necesario */
    left: 0;
    background: none;
    border: none;
    color: var(--color-accent-sky-blue); /* Azul cielo */
    font-size: 1rem;
    cursor: pointer;
    padding: 5px;
    font-weight: bold;
}
.back-button:hover {
    color: var(--color-accent-lila); /* Lila al pasar */
}

#lesson-title {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2.2rem;
    color: var(--color-text-title); /* Gris profundo */
}

#micro-lesson-container {
    background-color: var(--color-surface); /* Fondo blanco */
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 1px solid var(--color-border-interactive-alt); /* Borde ddd */
}

#micro-lesson-content .citation {
    font-family: var(--font-title);
    font-weight: bold;
    color: var(--color-accent-gold); /* Dorado */
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    display: block;
}

#micro-lesson-content .text {
    font-style: italic;
    color: var(--color-text-primary); /* Gris oscuro principal */
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    border-left: 4px solid var(--color-accent-lila); /* Borde izquierdo lila */
    background-color: #fdfdfd; /* Fondo casi blanco para destacar cita */
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}

#micro-lesson-content .explanation {
    margin-top: 1.5rem; /* Más espacio antes de la explicación */
    color: var(--color-text-primary);
    line-height: 1.7;
}

/* Contexto de Preguntas (si se usa) */
.context-verse {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: #f9f9f9; /* Fondo ligeramente gris */
    border-radius: 5px;
    border: 1px solid var(--color-border-interactive-alt);
}
.context-verse p strong { color: var(--color-text-title); }
.context-verse .citation,
.context-verse .text { margin-bottom: 0.5rem; }
.context-verse .explanation { font-size: 0.9em; color: var(--color-text-nav-button); }


/* Interactive Elements */
#micro-lesson-interactive {
    margin-top: 1.5rem;
    padding: 1.5rem; /* Más padding */
    border-top: 2px dashed var(--color-accent-sky-blue); /* Borde discontinuo azul cielo */
    background-color: var(--color-accent-blue-pale); /* Fondo AliceBlue */
    border-radius: 8px; /* Redondear contenedor interactivo */
}

#micro-lesson-interactive h4 {
    font-family: var(--font-body); /* Usar fuente de cuerpo para preguntas */
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--color-text-title); /* Gris profundo */
}

/* Opciones MCQ / TrueFalse */
.options-list { list-style: none; padding: 0; }
.options-list li { margin-bottom: 0.8rem; }

.options-list label {
    display: block;
    background-color: var(--color-surface); /* Fondo blanco */
    padding: 0.8rem 1.2rem;
    border-radius: 5px;
    border: 1px solid var(--color-border-interactive); /* Borde ccc */
    cursor: pointer;
    transition: background-color 0.3s ease, border-color 0.3s ease;
    color: var(--color-text-primary);
}

.options-list input[type="radio"],
.options-list input[type="checkbox"] {
    margin-right: 0.8rem;
    vertical-align: middle;
    accent-color: var(--color-accent-lila); /* Selector Lila */
}

.options-list label:hover {
    background-color: var(--color-accent-blue-pale); /* Fondo Azul pálido */
    border-color: var(--color-accent-sky-blue); /* Borde Azul cielo */
}

.options-list input[type="radio"]:disabled + span,
.options-list input[type="checkbox"]:disabled + span {
    opacity: 0.7; /* Atenuar texto de opción deshabilitada */
}
.options-list label:has(input:disabled) {
    cursor: default;
    background-color: #f8f8f8; /* Fondo ligeramente gris */
    opacity: 0.7;
}


.options-list input[type="radio"]:checked + span,
.options-list input[type="checkbox"]:checked + span {
     font-weight: bold;
     color: var(--color-accent-lila); /* Texto seleccionado Lila */
}

/* Input para fill_blank */
input.fill-blank-input {
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--color-border-interactive);
    border-radius: 4px;
    font-size: 1rem;
    margin-left: 0.5rem; /* Espacio después del texto */
    min-width: 150px; /* Ancho mínimo */
}
input.fill-blank-input:focus {
    outline: none;
    border-color: var(--color-accent-sky-blue);
    box-shadow: 0 0 0 2px rgba(142, 197, 252, 0.3);
}

/* Estilos para 'match' (si se implementa) */
.match-container {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    margin-bottom: 1rem; /* Espacio antes del botón */
}
.match-column {
    width: 45%;
}
.match-column h5 {
    margin-bottom: 0.8rem;
    color: var(--color-text-nav-button);
    border-bottom: 1px solid var(--color-border-subtle);
    padding-bottom: 0.3rem;
    font-size: 0.9em;
    text-transform: uppercase;
}
.match-item {
    background-color: var(--color-surface);
    padding: 0.8rem;
    margin-bottom: 0.8rem;
    border: 1px solid var(--color-border-interactive-alt);
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}
.match-item.selected {
    background-color: var(--color-accent-lila-pale);
    border-color: var(--color-accent-lila);
    font-weight: bold;
}
.match-item.disabled { /* Para items ya emparejados */
    opacity: 0.5;
    cursor: default;
    background-color: #eee;
}


/* Feedback Area */
.feedback {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 5px;
    font-weight: bold;
    text-align: center;
    opacity: 0;
    transition: opacity 0.5s ease, background-color 0.3s ease;
    border: 1px solid transparent; /* Borde base */
    min-height: 40px; /* Evitar saltos de layout */
}

.feedback.correct {
    background-color: var(--color-correct-bg);
    color: var(--color-correct-text);
    border-color: var(--color-correct-border);
    opacity: 1;
}

.feedback.incorrect {
    background-color: var(--color-incorrect-bg);
    color: var(--color-incorrect-text);
    border-color: var(--color-incorrect-border);
    opacity: 1;
}

/* Navigation Controls */
.navigation-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-border-subtle); /* Borde sutil e0e0e0 */
}

#lesson-progress {
    width: 60%;
    height: 10px;
    appearance: none;
    border: none;
    border-radius: 10px;
    overflow: hidden;
    background-color: var(--color-border-interactive-alt); /* Fondo gris ddd */
}
#lesson-progress::-webkit-progress-bar {
    background-color: var(--color-border-interactive-alt);
    border-radius: 10px;
}
#lesson-progress::-webkit-progress-value {
    background: var(--color-accent-gold); /* Relleno dorado */
    border-radius: 10px 0 0 10px; /* Redondeo solo al inicio */
    transition: width 0.5s ease-out;
}
#lesson-progress::-moz-progress-bar {
    background: var(--color-accent-gold);
    border-radius: 10px 0 0 10px;
    transition: width 0.5s ease-out;
}

#progress-text {
    font-size: 0.9em;
    color: var(--color-text-nav-button); /* Gris medio */
    margin: 0 10px;
}


/* Botones CTA (Call to Action) */
.cta-button {
    border: none;
    padding: 0.8rem 1.8rem; /* Un poco más de padding horizontal */
    border-radius: 5px;
    font-family: var(--font-body);
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
}

/* Botón Primario (Siguiente) */
#next-button {
    background-color: var(--color-accent-sky-blue); /* Azul Cielo */
    color: var(--color-surface); /* Texto Blanco */
}
#next-button:hover:not(:disabled) {
    background-color: #7ab8f0; /* Azul Cielo más oscuro */
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(142, 197, 252, 0.3); /* Sombra azulada */
}

/* Botón Secundario/Acción (Comprobar Respuesta) */
#submit-answer { /* ID usado en JS */
    background-color: var(--color-accent-lila); /* Lila Claro */
    color: var(--color-text-title); /* Texto Gris Profundo */
    margin-top: 1rem; /* Espacio arriba del botón de comprobar */
}
#submit-answer:hover:not(:disabled) {
    background-color: #d4b0f0; /* Lila más oscuro */
    transform: translateY(-2px);
    box-shadow: 0 5px 10px rgba(224, 195, 252, 0.3); /* Sombra lilácea */
}

/* Estado Deshabilitado Común */
.cta-button:disabled {
    background-color: var(--color-border-subtle); /* Gris e0e0e0 */
    color: #999; /* Gris más oscuro */
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

/* Certificate View */
.certificate-container {
     position: relative;
     background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-accent-blue-pale) 100%); /* Fondo blanco a azul pálido */
     padding: 3rem;
     border-radius: 10px;
     text-align: center;
     /* Borde grueso Lila */
     border: 4px solid var(--color-accent-lila);
}

.certificate {
     background-color: rgba(255, 255, 255, 0.95); /* Fondo blanco casi opaco */
     padding: 2.5rem;
     border-radius: 5px;
     display: inline-block;
     max-width: 600px;
     width: 100%;
     box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
     border: 1px solid var(--color-border-interactive-alt); /* Borde interno sutil */
}

.certificate-header {
    border-bottom: 2px solid var(--color-accent-gold); /* Línea dorada */
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.certificate-logo {
    font-family: var(--font-title);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-text-title); /* Logo en Gris Profundo */
    margin-bottom: 0.5rem;
}

.certificate-header h2 {
    color: var(--color-text-title); /* Gris Profundo */
    font-size: 1.8rem;
}

.certificate-body p {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--color-text-nav-button); /* Gris Medio */
}

.certificate-body h3 {
    font-size: 1.6rem;
    color: var(--color-accent-gold); /* Título de lección en Dorado */
    margin: 1rem 0;
    font-family: var(--font-title);
}

.certificate-footer {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--color-border-interactive); /* Línea discontinua ccc */
    font-style: italic;
    color: var(--color-text-nav-button); /* Gris Medio */
}

/* Footer */
.main-footer {
    background-color: #f0f0f0; /* Gris muy pálido */
    color: var(--color-text-nav-button); /* Gris medio */
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
    font-size: 0.9rem;
    border-top: 1px solid var(--color-border-subtle); /* Borde sutil e0e0e0 */
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .main-header {
        flex-direction: column;
        text-align: center;
        padding: 1rem;
    }
    .main-header .logo { margin-bottom: 0.5rem; }
    .streak-counter { margin-top: 0.5rem; }
    .main-content { padding: 1rem; margin: 1rem; }
    .lesson-list { grid-template-columns: 1fr; }
    #lesson-title { font-size: 1.8rem; }
     .navigation-controls { flex-direction: column; gap: 1rem; align-items: stretch; }
     #lesson-progress { width: 100%; }
     .cta-button { width: 100%; padding: 1rem; }
      .certificate-container { padding: 1.5rem; }
     .certificate { padding: 1.5rem; }
     .match-container { flex-direction: column; gap: 1rem;} /* Apilar columnas de match en móvil */
     .match-column { width: 100%; }
}