/* Variables */
:root {
    /* Colores */
    --color-primary: #4F46E5;
    --color-primary-dark: #3730A3;
    --color-secondary: #10B981;
    --color-text: #1F2937;
    --color-text-light: #6B7280;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F9FAFB;
    --color-border: #E5E7EB;

    /* Tipografía */
    --font-primary: 'Poppins', sans-serif;

    /* Espaciados */
    --spacing-xs: 0.8rem;
    --spacing-sm: 1.6rem;
    --spacing-md: 3.2rem;
    --spacing-lg: 6.4rem;
    --spacing-xl: 9.6rem;

    /* Bordes */
    --radius-sm: 0.6rem;
    --radius-md: 1.2rem;
    --radius-full: 999px;

    /* Transiciones */
    --transition-base: 0.3s ease;

    /* Contenedor */
    --container-width: 120rem;
}

/* Reset */
html {
    box-sizing: border-box;
    font-size: 62.5%;
    scroll-behavior: smooth;
}
*, *:before, *:after {
    box-sizing: inherit;
}
body {
    font-family: var(--font-primary);
    font-size: 1.6rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}
h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 600;
}
ul {
    list-style: none;
}
a {
    text-decoration: none;
    color: inherit;
}
img {
    max-width: 100%;
    display: block;
}
button, input {
    font-family: inherit;
    border: none;
    background: none;
}

/* Utils */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}
.section__title {
    font-size: 3.2rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
}
.btn {
    display: inline-block;
    padding: 1.2rem 2.8rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition-base);
}
.btn--primary {
    background-color: var(--color-primary);
    color: #fff;
}
.btn--primary:hover {
    background-color: var(--color-primary-dark);
}
.btn--outline {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}
.btn--outline:hover {
    background-color: var(--color-primary);
    color: #fff;
}
.btn--lg {
    padding: 1.6rem 3.6rem;
    font-size: 1.7rem;
}

/* Header / Nav */
.header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-xs);
    padding-bottom: var(--spacing-xs);
}
.nav__logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}
.nav__menu {
    display: flex;
    gap: var(--spacing-md);
}
.nav__link {
    font-weight: 500;
    transition: var(--transition-base);
}
.nav__link:hover {
    color: var(--color-primary);
}

/* Hero */
.hero {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-bg-alt), #EEF2FF);
    text-align: center;
}
.hero__content {
    max-width: 70rem;
}
.hero__title {
    font-size: 4.8rem;
    margin-bottom: var(--spacing-sm);
}
.hero__subtitle {
    font-size: 1.9rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

/* Curriculum */
.curriculum {
    padding: var(--spacing-lg) 0;
}
.curriculum__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(28rem, 1fr));
    gap: var(--spacing-md);
}
.curriculum__card {
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: var(--transition-base);
}
.curriculum__card:hover {
    transform: translateY(-0.5rem);
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.06);
}
.curriculum__number {
    display: inline-block;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-primary);
    background-color: #EEF2FF;
    padding: 0.4rem 1rem;
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-xs);
}
.curriculum__title {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}
.curriculum__text {
    font-size: 1.5rem;
    color: var(--color-text-light);
}

/* Instructor */
.instructor {
    padding: var(--spacing-lg) 0;
    background-color: var(--color-bg-alt);
}
.instructor__content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}
.instructor__img,
.instructor__text {
    flex: 1;
    min-width: 28rem;
}
.instructor__img img {
    border-radius: var(--radius-md);
    aspect-ratio: 1 / 1;
    object-fit: cover;
}
.instructor__name {
    font-size: 2.4rem;
    margin-bottom: 0.4rem;
}
.instructor__role {
    font-size: 1.5rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-top: 0.2rem;
    margin-bottom: var(--spacing-sm);
}
.instructor__bio {
    font-size: 1.6rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}
.instructor__stats {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}
.instructor__stats li {
    font-size: 1.4rem;
    color: var(--color-text-light);
}
.instructor__stats strong {
    display: block;
    font-size: 2.2rem;
    color: var(--color-text);
}

/* Testimoniales */
.testimonials {
    padding: var(--spacing-lg) 0;
}
.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(28rem, 1fr));
    gap: var(--spacing-md);
}
.testimonial__card {
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}
.testimonial__text {
    font-size: 1.6rem;
    font-style: italic;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}
.testimonial__author {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}
.testimonial__avatar {
    width: 4.8rem;
    height: 4.8rem;
    border-radius: 50%;
    object-fit: cover;
}
.testimonial__name {
    font-weight: 600;
    margin-bottom: 0.2rem;
    font-size: 1.4rem;
}
.testimonial__role {
    font-size: 1.3rem;
    margin-top:  0.2rem;
    color: var(--color-text-light);
}

/* Precios */
.pricing {
    padding: var(--spacing-lg) 0;
    background-color: var(--color-bg-alt);
    text-align: center;
}
.pricing__toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}
.switch {
    position: relative;
    display: inline-block;
    width: 5rem;
    height: 2.6rem;
}
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.switch__slider {
    position: absolute;
    inset: 0;
    background-color: var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-base);
}
.switch__slider::before {
    content: "";
    position: absolute;
    height: 2rem;
    width: 2rem;
    left: 0.3rem;
    bottom: 0.3rem;
    background-color: #fff;
    border-radius: 50%;
    transition: var(--transition-base);
}
.switch input:checked + .switch__slider {
    background-color: var(--color-primary);
}
.switch input:checked + .switch__slider::before {
    transform: translateX(2.4rem);
}
.pricing__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(28rem, 1fr));
    gap: var(--spacing-md);
    max-width: 70rem;
    margin: 0 auto;
}
.pricing__card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}
.pricing__card--featured {
    border: 2px solid var(--color-primary);
    transform: scale(1.03);
}
.pricing__amount {
    font-size: 4rem;
    font-weight: 700;
}
.pricing__period {
    font-size: 1.4rem;
    color: var(--color-text-light);
}

/* FAQ */
.faq {
    padding: var(--spacing-lg) 0;
    max-width: 80rem;
    margin: 0 auto;
}
.faq__item {
    border-bottom: 1px solid var(--color-border);
}
.faq__question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    font-size: 1.6rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
}
.faq__icon {
    font-size: 2rem;
    color: var(--color-primary);
    transition: var(--transition-base);
}
.faq__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}
.faq__answer p {
    padding-bottom: var(--spacing-sm);
    color: var(--color-text-light);
    font-size: 1.5rem;
}

/* Estado abierto (la clase .is-open la agrega el JS) */
.faq__item.is-open .faq__icon {
    transform: rotate(45deg);
}
.faq__item.is-open .faq__answer {
    max-height: 20rem;
}

/* CTA FINAL */
.cta-final {
    padding: var(--spacing-lg) 0;
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
}
.cta-final h2 {
    margin-bottom: var(--spacing-sm);
}

/* Footer */
.footer {
    padding: var(--spacing-sm) 0;
    text-align: center;
    background-color: var(--color-text);
    color: #fff;
    font-size: 1.4rem;
}

/* Animaciones scroll */
.fade-in {
    opacity: 0;
    transform: translateY(2rem);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive - Tablet */
@media (max-width: 768px) {
    .nav__menu {
        display: none;
    }
    .hero__title {
        font-size: 3.4rem;
    }
    .hero__subtitle {
        font-size: 1.7rem;
    }
    .instructor__content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    .instructor__img {
        max-width: 24rem;
        margin: 0 auto;
    }
    .instructor__stats {
        justify-content: center;
    }
    .pricing__card--featured {
        transform: scale(1);
    }
    .curriculum,
    .instructor,
    .testimonials,
    .pricing,
    .faq,
    .cta-final {
        padding: var(--spacing-lg) 0;
    }
}

/* Responsive - Mobile */
@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-lg) 0;
    }
    .hero__title {
        font-size: 2.8rem;
    }
    .hero__subtitle {
        font-size: 1.6rem;
    }
    .section__title {
        font-size: 2.6rem;
    }
    .btn--lg {
        padding: 1.4rem 2.8rem;
        font-size: 1.6rem;
        width: 100%;
    }
    .curriculum__grid,
    .testimonials__grid,
    .pricing__grid {
        grid-template-columns: 1fr;
    }
    .instructor__stats {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}