@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800&display=swap');

:root {
    --color-primario: #5867dd;
    --color-secundario: #ffffff;
    --color-terciario: #79829c;
    --color-acento: #34d399;
    --color-texto-principal: #2d3748;
    --color-texto-secundario: #4a5568;
    --color-fondo-page: #f8f9fa;
    --color-borde: #e2e8f0;
    --border-radius-main: 12px;
    --shadow-main: 0 8px 25px rgba(0,0,0,0.07);
    --shadow-light: 0 4px 12px rgba(0,0,0,0.05);
}

body {
    font-family: 'Nunito', 'Arial', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--color-fondo-page);
    color: var(--color-texto-principal);
}

main { 
    flex-grow: 1; 
    padding: 2rem 1rem;
    max-width: 900px;
    margin: 0 auto;
}

.srs-view { display: none; }
.srs-view.active { display: block; }

.srs-header-main {
    text-align: center;
    margin-bottom: 2.5rem;
}
.srs-header-main h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin: 0;
    color: var(--color-primario);
}
.srs-header-main p {
    font-size: 1.1rem;
    color: var(--color-texto-secundario);
    margin-top: 0.5rem;
}

#srs-scheduled-reviews-section h3,
#srs-free-review-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--color-borde);
}

.free-review-subtitle {
    text-align: center;
    font-size: 1rem;
    color: var(--color-texto-secundario);
    margin-bottom: 2rem;
}

.loading-text {
    color: var(--color-terciario);
    font-style: italic;
    text-align: center;
    padding: 2rem 0;
}

.srs-dashboard-container {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}
.srs-dashboard-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1rem 1.5rem;
    background-color: var(--color-secundario);
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-light);
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.srs-dashboard-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-main);
}
.srs-dashboard-item-cover {
    width: 60px;
    height: 90px;
    object-fit: cover;
    border-radius: 6px;
    flex-shrink: 0;
}
.srs-dashboard-item-info { flex-grow: 1; }
.srs-dashboard-item-info h4 {
    margin: 0 0 0.25rem 0;
    font-size: 1.3rem;
    font-weight: 700;
}
.srs-dashboard-item-info p {
    margin: 0;
    font-size: 1rem;
    color: var(--color-texto-secundario);
}
.srs-dashboard-item-info strong {
    color: var(--color-acento);
    font-weight: 700;
}
.srs-review-button {
    background-color: var(--color-primario);
    color: var(--color-secundario);
    padding: 0.8rem 1.8rem;
    border: none;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    font-size: 0.95rem;
    transition: background-color 0.2s ease, transform 0.1s ease;
}
.srs-review-button:hover {
    background-color: #4a58c0;
    transform: translateY(-2px);
}

.srs-free-review-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.free-review-card {
    background-color: var(--color-secundario);
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-light);
    text-align: center;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.free-review-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-main);
}
.free-review-card img {
    width: 100px;
    height: 150px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1rem;
}
.free-review-card h4 {
    margin: 0 0 1rem 0;
    font-size: 1.1rem;
    flex-grow: 1;
}
.free-review-card .btn {
    width: 100%;
}

.srs-container {
    background-color: var(--color-secundario);
    border-radius: var(--border-radius-main);
    padding: 2rem 1.5rem; /* Ajustado para móviles */
    box-shadow: var(--shadow-main);
    max-width: 768px;
    margin: 0 auto;
}
.srs-header {
    margin-bottom: 2rem;
    text-align: center;
    border-bottom: 1px solid var(--color-borde);
    padding-bottom: 1.5rem;
}
#srs-session-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-primario);
    margin-top: 0;
    margin-bottom: 1rem;
}
.srs-session-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
    justify-content: center;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
}
#srs-progress-text { font-weight: 600; color: var(--color-texto-secundario); font-size: 0.9rem; }
.progress-bar-container { flex-grow: 1; background-color: #e9ecef; border-radius: 10px; height: 10px; overflow: hidden; }
.progress-bar { width: 0%; height: 100%; background-color: var(--color-acento); border-radius: 10px; transition: width 0.5s ease; }

#question-area-srs { text-align: center; min-height: 280px; display: flex; flex-direction: column; justify-content: center; }
#question-section-srs .question-text { font-size: 1.3rem; font-weight: 600; margin-bottom: 1.5rem; color: var(--color-texto-principal); line-height: 1.5; }
.user-note-reminder { background-color: #fffbe6; border-left: 4px solid #facc15; padding: 1rem; border-radius: 8px; margin-bottom: 1.5rem; text-align: left; display: flex; align-items: flex-start; gap: 0.75rem; }
.user-note-reminder .note-icon { font-size: 1.2rem; }
.user-note-reminder p { margin: 0; color: #78350f; }
.user-note-reminder p strong { color: #92400e; }


.btn { padding: 0.9rem 2rem; border: none; border-radius: 8px; font-weight: 700; cursor: pointer; margin-top: 1rem; font-size: 1rem; transition: background-color 0.2s ease, transform 0.1s ease; }

/* START: MODIFICACIÓN - Estilo para el botón de verificar */
.btn-verify {
    background-color: var(--color-primario);
    color: white;
    border: none;
    padding: 0.9rem 1.5rem;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-top: 1.5rem;
}
/* END: MODIFICACIÓN */


.correct-answer-display { text-align: left; background-color: #f8fafc; border-left: 3px solid var(--color-acento); padding: 0.75rem 1rem; margin-top: 0.5rem; border-radius: 4px; }
.correct-answer-display strong { color: var(--color-texto-principal); }

footer { text-align: center; padding: 2rem; font-size: 0.9rem; color: var(--color-terciario); margin-top: auto; }

@media (min-width: 768px) {
    .srs-container { padding: 2rem 2.5rem; }
    #question-section-srs .question-text { font-size: 1.5rem; }
}

@media (max-width: 576px) {
    .srs-dashboard-item {
        flex-direction: column;
        text-align: center;
    }
    .srs-dashboard-item-info {
        flex-grow: 0;
    }
    .srs-review-button {
        width: 100%;
    }
}