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

/* === ReadFy Index Page Styles (styles/index.css) === */
/* Mobile-First Responsive Design */

:root {
    --color-primario: #5867dd;
    --color-primario-hover: #4a58c0;
    --color-secundario: #ffffff;
    --color-fondo-page: #f8f9fa;
    --color-fondo-section: #ffffff;
    --color-texto-principal: #2d3748;
    --color-texto-secundario: #4a5568;
    --color-texto-hero: #ffffff;
    --color-acento: #34d399;
    --color-acento-hover: #2aa879;
    --color-border-suave: #e2e8f0;
    --border-radius-main: 12px;
    --shadow-soft: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-strong: 0 10px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --font-principal: 'Nunito', 'Arial', sans-serif;
}

/* --- Estilos Generales y Mobile Base --- */

body {
    font-family: var(--font-principal);
    background-color: var(--color-fondo-page);
    color: var(--color-texto-principal);
    line-height: 1.6;
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: var(--border-radius-main);
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    border: none;
}

.btn-primary {
    background-color: var(--color-primario);
    color: var(--color-secundario);
}
.btn-primary:hover {
    background-color: var(--color-primario-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(88,103,221,0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primario);
    border: 2px solid var(--color-primario);
}
.btn-secondary:hover {
    background-color: var(--color-primario);
    color: var(--color-secundario);
}

.index-main {
    flex-grow: 1;
}

/* --- Hero Section --- */
.hero-main {
    background: linear-gradient(135deg, var(--color-primario) 0%, #7685f5 100%);
    color: var(--color-texto-hero);
    padding: 4rem 1.5rem;
    text-align: center;
}

.hero-content-main {
    max-width: 600px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    line-height: 1.6;
    opacity: 0.9;
}

.btn-hero {
    background-color: var(--color-acento);
    color: var(--color-secundario);
    padding: 0.9rem 2.2rem;
    font-size: 1rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
}
.btn-hero:hover {
    background-color: var(--color-acento-hover);
    box-shadow: 0 6px 20px rgba(52,211,153,0.3);
}

/* --- Secciones de Contenido --- */
.feature-section, .highlight-section, .cta-section {
    padding: 3.5rem 1.5rem;
    text-align: center;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-texto-principal);
    margin-bottom: 2.5rem;
    position: relative;
    display: inline-block;
}
.section-title::after {
    content: '';
    display: block;
    width: 50px;
    height: 4px;
    background-color: var(--color-primario);
    margin: 0.75rem auto 0;
}

/* --- Features Section --- */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
}
.feature-item {
    background-color: var(--color-fondo-section);
    padding: 2rem 1.5rem;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
}
.feature-icon-wrapper {
    width: 50px;
    height: 50px;
    margin: 0 auto 1.5rem auto;
    border-radius: 50%;
    background-color: #eef2ff;
    display: flex;
    align-items: center;
    justify-content: center;
}
.feature-icon-wrapper svg {
    width: 28px;
    height: 28px;
    fill: var(--color-primario);
}
.feature-item h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--color-texto-principal);
}
.feature-item p {
    font-size: 1rem;
    color: var(--color-texto-secundario);
    line-height: 1.6;
}

/* --- Highlight (Destacados) Section --- */
.highlight-section {
    background-color: var(--color-fondo-page);
}
.highlight-books-container {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}
.highlight-book-card {
    background-color: var(--color-fondo-section);
    width: 220px;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-soft);
    overflow: hidden;
    text-align: center;
}
.highlight-book-card img {
    width: 100%;
    height: 300px;
    object-fit: cover;
}
.highlight-book-card h4 {
    font-size: 1.1rem;
    margin: 1rem 0.5rem 0.2rem;
    color: var(--color-texto-principal);
}
.highlight-book-card p {
    font-size: 0.9rem;
    color: var(--color-texto-secundario);
    margin-bottom: 1rem;
    padding: 0 0.5rem;
}

/* --- CTA (Call to Action) Section --- */
.cta-section {
    background-color: var(--color-primario);
    color: var(--color-texto-hero);
}
.cta-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--color-texto-hero);
}
.btn-cta {
    background-color: var(--color-secundario);
    color: var(--color-primario);
    font-size: 1.1rem;
}
.btn-cta:hover {
    background-color: #f0f0f0;
    color: var(--color-primario-hover);
}

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

/* --- Media Queries para Tablets y Escritorios --- */

/* Tablet (768px y más) */
@media (min-width: 768px) {
    .hero-main {
        padding: 5rem 2rem;
        text-align: left;
    }
    .hero-content-main {
        max-width: 1200px;
    }
    .hero-title {
        font-size: 3rem;
    }
    .hero-subtitle {
        font-size: 1.25rem;
        max-width: 550px;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .section-title {
        font-size: 2.5rem;
    }
    .cta-section h2 {
        font-size: 2.2rem;
    }
}

/* Escritorio (1024px y más) */
@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .hero-title {
        font-size: 3.5rem;
    }
}