/* ==========================================================================
   Portfolio — estilos propios (sin Bootstrap)
   Índice:
   1. Fuentes y variables
   2. Base y reset
   3. Utilidades de layout
   4. Botones
   5. Loader
   6. Navegación
   7. Hero
   8. Logos de clientes
   9. Proyectos
   10. Servicios
   11. Testimonios (carrusel)
   12. Preguntas frecuentes
   13. Llamado a la acción
   14. Footer
   15. Botón volver arriba
   16. Animaciones de aparición
   ========================================================================== */


/* 1. Fuentes y variables
   ========================================================================== */

@font-face {
    font-family: "Inter var";
    font-weight: 100 900;
    font-style: normal;
    font-display: swap;
    src: url("../fonts/Inter-roman.var.woff2") format("woff2");
}

@font-face {
    font-family: "Inter var";
    font-weight: 100 900;
    font-style: italic;
    font-display: swap;
    src: url("../fonts/Inter-italic.var.woff2") format("woff2");
}

:root {
    /* Colores */
    --color-bg: #000;
    --color-bg-alt: #0a0a0a;
    --color-surface: #111;
    --color-surface-2: #1a1a1a;
    --color-text: #fff;
    --color-text-muted: #b3b3b3;
    --color-text-subtle: #8c8c8c;
    --color-accent: #facc15;
    --color-accent-hover: #eab308;
    --color-on-accent: #000;
    --color-border: rgba(255, 255, 255, .1);
    --color-border-accent: rgba(250, 204, 21, .35);

    /* Tipografía */
    --font-base: "Inter var", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

    /* Radios */
    --radius-sm: .5rem;
    --radius-md: 1rem;
    --radius-lg: 2rem;

    /* Layout */
    --container: 1320px;
    --gutter: .75rem;
    --section-y: 6rem;
    --nav-height: 5rem;

    --transition: .2s ease;
}

@media (min-width: 576px)  { :root { --section-y: 8rem; } }
@media (min-width: 1200px) { :root { --section-y: 10rem; } }


/* 2. Base y reset
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, .25) transparent;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: var(--font-base);
    font-feature-settings: "cv02", "cv03", "cv04", "cv11";
    font-size: 1rem;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

body.no-scroll {
    overflow: hidden;
}

h1, h2, h3, p {
    margin: 0;
}

img,
svg {
    display: block;
    max-width: 100%;
}

img {
    height: auto;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font: inherit;
    color: inherit;
    background: none;
    border: 0;
    padding: 0;
    cursor: pointer;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

section[id] {
    scroll-margin-top: var(--nav-height);
}

::-webkit-scrollbar {
    width: .375rem;
    height: .375rem;
}

::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, .25);
    border-radius: .25rem;
}

::-webkit-scrollbar-track {
    background-color: transparent;
}

.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}


/* 3. Utilidades de layout
   ========================================================================== */

.container {
    width: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: var(--gutter);
}

@media (min-width: 576px)  { .container { max-width: 540px; } }
@media (min-width: 768px)  { .container { max-width: 720px; } }
@media (min-width: 992px)  { .container { max-width: 960px; } }
@media (min-width: 1200px) { .container { max-width: 1140px; } }
@media (min-width: 1400px) { .container { max-width: 1320px; } }

.section {
    padding-block: var(--section-y);
    overflow: hidden;
}

.section--alt {
    background-color: var(--color-bg-alt);
}

/* Imagen con relación de aspecto fija y bordes redondeados responsive */
.media {
    width: 100%;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

@media (min-width: 576px)  { .media { border-radius: var(--radius-md); } }
@media (min-width: 1200px) { .media { border-radius: var(--radius-lg); } }

/* Encabezados de sección */
.eyebrow {
    font-size: 1rem;
    line-height: 1.75rem;
    font-weight: 600;
    color: var(--color-accent);
}

.title-lg {
    font-size: clamp(1.75rem, 1.35rem + 1.2vw, 2.25rem);
    line-height: 1.12;
    font-weight: 700;
    letter-spacing: -.025em;
}

.lead {
    font-size: 1.125rem;
    line-height: 2rem;
    color: var(--color-text-muted);
}


/* 4. Botones
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    padding: .75rem 1.25rem;
    font-size: .875rem;
    line-height: 1.25rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition), color var(--transition), transform var(--transition);
}

.btn--primary {
    color: var(--color-on-accent);
    background-color: var(--color-accent);
}

.btn--primary:hover {
    background-color: var(--color-accent-hover);
}

.btn--primary:active {
    transform: translateY(1px);
}


/* 5. Loader
   ========================================================================== */

.loader {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg);
    transition: opacity .3s ease, visibility .3s ease;
}

.loader.is-hidden {
    opacity: 0;
    visibility: hidden;
}

.loader__spinner {
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    background-color: var(--color-accent);
    animation: loader-grow .75s linear infinite;
}

@keyframes loader-grow {
    0%   { transform: scale(0); opacity: 1; }
    50%  { opacity: 1; }
    100% { transform: scale(1); opacity: 0; }
}


/* 6. Navegación
   ========================================================================== */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1030;
    width: 100%;
    padding-inline: .5rem;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    transition: background-color .3s ease, border-color .3s ease;
    border-bottom: 1px solid transparent;
}

@media (min-width: 576px) {
    .site-header { border-radius: 0 0 var(--radius-md) var(--radius-md); }
}

/* Fondo al hacer scroll (lo maneja scripts.js) */
.site-header.is-fixed {
    background-color: var(--color-bg-alt);
    border-bottom-color: var(--color-border-accent);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 1rem;
}

.brand {
    padding: .25rem;
    font-size: 1.25rem;
    font-weight: 800;
    font-style: italic;
    white-space: nowrap;
}

.brand span {
    color: var(--color-accent);
}

/* Botón hamburguesa animado */
.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: .5rem;
}

.nav-toggle__bar {
    display: block;
    width: 30px;
    height: 3px;
    background-color: var(--color-text);
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* Menú móvil: panel inferior (offcanvas) */
.nav-panel {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1045;
    background-color: var(--color-surface);
    border-top: 2px solid var(--color-accent);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    transform: translateY(100%);
    visibility: hidden;
    transition: transform .3s ease, visibility .3s ease;
}

.nav-panel.is-open {
    transform: translateY(0);
    visibility: visible;
}

.nav-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
}

.nav-panel__close {
    display: flex;
    padding: .5rem;
    opacity: .75;
    transition: opacity var(--transition);
}

.nav-panel__close:hover {
    opacity: 1;
}

.nav-panel__body {
    padding: 0 1rem 1.5rem;
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.nav-link {
    display: block;
    padding: .5rem 1rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition), color var(--transition);
}

.nav-link:hover {
    color: var(--color-accent);
    background-color: var(--color-surface-2);
}

.nav-list .btn {
    width: 100%;
    padding: .75rem 1rem;
    font-size: 1rem;
    line-height: 1.5rem;
}

.nav-backdrop {
    position: fixed;
    inset: 0;
    z-index: 1040;
    background-color: rgba(0, 0, 0, .6);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease, visibility .3s ease;
}

.nav-backdrop.is-open {
    opacity: 1;
    visibility: visible;
}

/* Escritorio: menú horizontal */
@media (min-width: 1200px) {
    .nav-toggle,
    .nav-panel__header,
    .nav-backdrop {
        display: none;
    }

    .nav-panel {
        position: static;
        flex-grow: 1;
        background: none;
        border: 0;
        border-radius: 0;
        transform: none;
        visibility: visible;
        transition: none;
    }

    .nav-panel__body {
        padding: 0;
    }

    .nav-list {
        flex-direction: row;
        align-items: center;
        justify-content: center;
    }

    /* Links centrados y botón de contacto a la derecha */
    .nav-list > li:first-child,
    .nav-list > li:last-child {
        margin-left: auto;
    }

    .nav-list .btn {
        width: auto;
    }
}


/* 7. Hero
   ========================================================================== */

.hero {
    position: relative;
    display: flex;
    align-items: center;
}

.hero__inner {
    display: grid;
    gap: 3rem;
    align-items: center;
    padding-block: 8rem;
}

.hero__content {
    max-width: 42rem;
    margin-inline: auto;
    padding-block: 3rem;
    text-align: center;
}

.hero__media {
    width: 100%;
    max-width: 42rem;
    margin-inline: auto;
}

.hero__media .media {
    aspect-ratio: 1200 / 920;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .35rem .75rem;
    font-size: .75rem;
    font-weight: 500;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border-accent);
    border-radius: 50rem;
}

.badge__dot {
    width: .375rem;
    height: .375rem;
    border-radius: 50%;
    background-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(250, 204, 21, .2);
}

.hero__title {
    margin-top: 1.5rem;
    font-size: clamp(2.5rem, 1.5rem + 3vw, 3.75rem);
    line-height: 1;
    font-weight: 700;
    letter-spacing: -.025em;
}

.hero__title em {
    font-style: normal;
    color: var(--color-accent);
}

.hero__text {
    margin-top: 1.5rem;
}

.hero__actions {
    margin-top: 1.5rem;
    padding-top: 1rem;
}

@media (min-width: 768px) {
    .hero__inner { padding-block: 10rem; }
}

@media (min-width: 1200px) {
    .hero__inner {
        grid-template-columns: 5fr 6fr;
        justify-content: space-between;
        column-gap: 8.33%;
        padding-block: 14rem;
    }

    .hero__content {
        order: ;
        margin-inline: 0;
        padding-block: 0;
        text-align: left;
    }

    .hero__media {
        margin-inline: 0;
    }
}


/* 8. Logos de clientes
   ========================================================================== */

.clients {
    padding-bottom: 4rem;
}

.clients__title {
    margin-bottom: 3rem;
    font-size: 1.125rem;
    line-height: 2rem;
    font-weight: 600;
    text-align: center;
}

.clients__list {
    --cols: 2;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    color: var(--color-text);
}

.clients__list > li {
    flex: 0 0 calc((100% - 1.5rem * (var(--cols) - 1)) / var(--cols));
    opacity: .85;
    transition: opacity var(--transition), color var(--transition);
}

.clients__list > li:hover {
    opacity: 1;
    color: var(--color-accent);
}

@media (min-width: 576px)  { .clients__list { --cols: 3; } }
@media (min-width: 992px)  { .clients__list { --cols: 4; } }
@media (min-width: 1200px) { .clients__list { --cols: 5; } }


/* 9. Proyectos
   ========================================================================== */

.section-header {
    max-width: 36rem;
    margin-bottom: 3rem;
}

.section-header--center {
    max-width: 42rem;
    margin-inline: auto;
    text-align: center;
}

.section-header--center .title-lg {
    margin-top: .5rem;
}

.section-header--center .lead {
    margin-top: 1.5rem;
}

@media (min-width: 576px)  { .section-header { margin-bottom: 4rem; } }
@media (min-width: 1200px) { .section-header { margin-bottom: 6rem; } }

.projects-grid {
    display: grid;
    gap: 3rem;
}

@media (min-width: 576px) {
    .projects-grid { grid-template-columns: repeat(2, 1fr); }
}

.project-card {
    position: relative;
    padding-top: 1.5rem;
}

.project-card .media {
    aspect-ratio: 4 / 3;
    transition: transform .4s ease;
}

.project-card:hover .media {
    transform: scale(1.02);
}

.project-card__title {
    margin-top: 1.5rem;
    font-size: 1.25rem;
    line-height: 1.75rem;
    font-weight: 500;
    letter-spacing: -.025em;
    color: var(--color-text);
    transition: color var(--transition);
}

/* El link cubre toda la tarjeta */
.project-card__title a::after {
    content: "";
    position: absolute;
    inset: 0;
}

.project-card:hover .project-card__title {
    color: var(--color-accent);
}

.section-actions {
    display: flex;
    justify-content: center;
    margin-top: 3rem;
    padding-top: 3rem;
}

@media (min-width: 576px)  { .section-actions { margin-top: 4rem; } }
@media (min-width: 1200px) { .section-actions { margin-top: 6rem; } }


/* 10. Servicios
   ========================================================================== */

.services-grid {
    display: grid;
    row-gap: 3rem;
    margin-top: .25rem;
}

.service {
    max-width: 36rem;
    margin-inline: auto;
    padding-top: 3rem;
}

.service .media {
    aspect-ratio: 3 / 2;
}

.service__title {
    margin-top: 1.5rem;
    font-size: 1.125rem;
    line-height: 1.5rem;
    font-weight: 600;
}

.service__title::before {
    content: "";
    display: block;
    width: 2rem;
    height: 3px;
    margin-bottom: .75rem;
    background-color: var(--color-accent);
    border-radius: 2px;
}

.service__text {
    display: -webkit-box;
    margin-top: 1rem;
    overflow: hidden;
    font-size: .875rem;
    line-height: 1.5rem;
    color: var(--color-text-muted);
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

@media (min-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
        column-gap: 1.5rem;
    }

    .service {
        margin-inline: 0;
        padding-top: 1.5rem;
    }
}


/* 11. Testimonios (carrusel)
   ========================================================================== */

.carousel {
    position: relative;
}

.carousel__header {
    max-width: 42rem;
    margin-bottom: 3rem;
}

.carousel__header .title-lg {
    margin-top: .5rem;
}

.carousel__controls {
    display: flex;
    gap: .5rem;
}

.carousel__btn {
    display: flex;
    color: var(--color-text);
    border-radius: 50%;
    transition: color var(--transition);
}

.carousel__btn:hover {
    color: var(--color-accent);
}

@media (min-width: 992px) {
    .carousel__controls {
        position: absolute;
        top: 0;
        right: var(--gutter);
    }
}

.carousel__track {
    --per-view: 1;
    --gap: 20px;
    display: flex;
    gap: var(--gap);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    scrollbar-width: none;
}

.carousel__track::-webkit-scrollbar {
    display: none;
}

.carousel__slide {
    flex: 0 0 calc((100% - var(--gap) * (var(--per-view) - 1)) / var(--per-view));
    padding-block: 3rem;
    scroll-snap-align: start;
}

@media (min-width: 577px)  { .carousel__track { --per-view: 1.25; } }
@media (min-width: 769px)  { .carousel__track { --per-view: 1.5; } }
@media (min-width: 993px)  { .carousel__track { --per-view: 2.1; } }
@media (min-width: 1201px) { .carousel__track { --per-view: 2.5; } }
@media (min-width: 1401px) { .carousel__track { --per-view: 2.75; } }

.testimonial {
    display: flex;
    flex-direction: column;
    height: 100%;
    margin: 0;
    padding: 1.5rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition);
}

.testimonial:hover {
    border-color: var(--color-border-accent);
}

@media (min-width: 576px)  { .testimonial { border-radius: var(--radius-md); } }
@media (min-width: 1200px) { .testimonial { padding: 3rem; border-radius: var(--radius-lg); } }

.testimonial__icon {
    margin-left: -.5rem;
    color: var(--color-accent);
}

.testimonial blockquote {
    margin: 1.5rem 0;
    line-height: 1.75rem;
}

.testimonial figcaption {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: auto;
    font-size: .875rem;
}

.testimonial figcaption img {
    border-radius: 50%;
}

.testimonial__name {
    font-weight: 600;
    color: var(--color-text-muted);
}

.testimonial__role {
    color: var(--color-text-subtle);
}

.testimonial__role::before {
    content: "•";
    margin-inline: .5rem;
    color: var(--color-accent);
}


/* 12. Preguntas frecuentes
   ========================================================================== */

.faq {
    max-width: 56rem;
    margin-inline: auto;
}

.faq__title {
    margin-bottom: 1.5rem;
    font-size: clamp(1.4rem, 1.275rem + .3vw, 1.5rem);
    line-height: 2.5rem;
    font-weight: 700;
    letter-spacing: -.025em;
}

.faq__list {
    padding-top: .5rem;
}

.faq__item {
    padding-bottom: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.faq__item:last-child {
    border-bottom: 1px solid var(--color-border);
}

.faq__item summary {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding-top: 1.5rem;
    font-weight: 600;
    line-height: 1.75rem;
    list-style: none;
    cursor: pointer;
    transition: color var(--transition);
}

.faq__item summary h3 {
    font-size: 1rem;
    font-weight: 600;
}

.faq__item summary::-webkit-details-marker {
    display: none;
}

.faq__item summary:hover,
.faq__item[open] summary {
    color: var(--color-accent);
}

/* Ícono + / − */
.faq__item summary::after {
    content: "";
    flex-shrink: 0;
    width: 1.75rem;
    height: 1.75rem;
    background-color: var(--color-text);
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M8 4a.5.5 0 0 1 .5.5v3h3a.5.5 0 0 1 0 1h-3v3a.5.5 0 0 1-1 0v-3h-3a.5.5 0 0 1 0-1h3v-3A.5.5 0 0 1 8 4z'/%3E%3C/svg%3E") center / contain no-repeat;
            mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M8 4a.5.5 0 0 1 .5.5v3h3a.5.5 0 0 1 0 1h-3v3a.5.5 0 0 1-1 0v-3h-3a.5.5 0 0 1 0-1h3v-3A.5.5 0 0 1 8 4z'/%3E%3C/svg%3E") center / contain no-repeat;
}

.faq__item[open] summary::after {
    background-color: var(--color-accent);
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 8a.5.5 0 0 1 .5-.5h7a.5.5 0 0 1 0 1h-7A.5.5 0 0 1 4 8z'/%3E%3C/svg%3E");
            mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 8a.5.5 0 0 1 .5-.5h7a.5.5 0 0 1 0 1h-7A.5.5 0 0 1 4 8z'/%3E%3C/svg%3E");
}

.faq__answer {
    margin-top: .5rem;
    padding-right: 3rem;
    line-height: 1.75rem;
    color: var(--color-text-muted);
}


/* 13. Llamado a la acción
   ========================================================================== */

.cta {
    padding-top: 6rem;
    padding-bottom: 10rem;
}

.cta__box {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    padding: 4rem 1.5rem;
    border: 1px solid var(--color-border-accent);
    border-radius: var(--radius-sm);
    box-shadow: 0 .5rem 1rem rgba(0, 0, 0, .5);
}

@media (min-width: 576px)  { .cta__box { padding-inline: 4rem; border-radius: var(--radius-md); } }
@media (min-width: 1200px) { .cta__box { border-radius: var(--radius-lg); } }

.cta__bg,
.cta__box::before {
    position: absolute;
    inset: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
}

.cta__bg {
    object-fit: cover;
}

.cta__box::before {
    content: "";
    z-index: 0;
    background-color: #000;
    opacity: .85;
}

.cta__content {
    position: relative;
    max-width: 42rem;
    margin-inline: auto;
    text-align: center;
}

.cta__content .lead {
    margin-top: 1.5rem;
    color: var(--color-text);
}

.cta__content .btn {
    margin-top: 2.5rem;
}


/* 14. Footer
   ========================================================================== */

.site-footer {
    padding-block: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.site-footer__inner {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.site-footer__copy {
    font-size: .75rem;
    line-height: 1.25rem;
    color: var(--color-text-subtle);
}

.social {
    display: flex;
    gap: 1rem;
    order: -1;
}

.social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    color: var(--color-text);
    background-color: var(--color-surface-2);
    border-radius: 50%;
    transition: background-color var(--transition), color var(--transition);
}

.social a:hover {
    color: var(--color-on-accent);
    background-color: var(--color-accent);
}

@media (min-width: 768px) {
    .site-footer__inner {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .social {
        order: 0;
    }
}


/* 15. Botón volver arriba
   ========================================================================== */

.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 10;
    display: flex;
    padding: .5rem;
    color: var(--color-on-accent);
    background-color: var(--color-accent);
    border-radius: 50%;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition), background-color var(--transition);
}

.back-to-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background-color: var(--color-accent-hover);
}


/* 16. Animaciones de aparición (reemplazo liviano de AOS)
   ========================================================================== */

.js [data-reveal] {
    opacity: 0;
    transition: opacity 1s ease;
    transition-delay: var(--delay, 0ms);
}

.js [data-reveal].is-visible {
    opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
        transition-delay: 0ms !important;
    }
}


/* Quiénes somos
   ========================================================================== */

.about {
    display: grid;
    gap: 3rem;
    align-items: center;
}

.about__media .media {
    width: 100%;
    aspect-ratio: 3 / 2;
    object-fit: cover;
}

.about__content .title-lg {
    margin-bottom: 1.5rem;
}

.about__text {
    margin-top: 1rem;
    color: var(--color-text-muted);
}

.about__values {
    display: grid;
    gap: 1rem;
    margin: 2rem 0 0;
    padding: 0;
    list-style: none;
}

.about__values li {
    position: relative;
    padding-left: 1.75rem;
    color: var(--color-text-muted);
}

.about__values li::before {
    content: "";
    position: absolute;
    top: .55em;
    left: 0;
    width: .6rem;
    height: .6rem;
    border-radius: 50%;
    background-color: var(--color-accent);
}

.about__values strong {
    color: var(--color-text);
}

.about__stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 2.5rem 0;
}

.about__stats div {
    display: flex;
    flex-direction: column-reverse;
    gap: .25rem;
    padding: 1.25rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    text-align: center;
}

.about__stats dd {
    margin: 0;
    font-size: clamp(1.5rem, 4vw, 2.25rem);
    font-weight: 800;
    line-height: 1;
    color: var(--color-accent);
}

.about__stats dt {
    font-size: .85rem;
    color: var(--color-text-subtle);
}

@media (min-width: 1200px) {
    .about {
        grid-template-columns: 1fr 1fr;
        column-gap: 6rem;
    }
}


/* Página de curso (dos.html)
   ========================================================================== */

.course-hero {
    padding-top: calc(var(--section-y) + 6rem);
    padding-bottom: var(--section-y);
}

.course-hero__title {
    max-width: 52rem;
    margin-top: 1.5rem;
    font-size: clamp(2.25rem, 1.5rem + 3vw, 4rem);
    line-height: 1.05;
    font-weight: 800;
    letter-spacing: -.03em;
}

.course-hero__title em {
    color: var(--color-accent);
}

.course-hero__text {
    max-width: 42rem;
    margin-top: 1.5rem;
}

.course-facts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
    gap: 1rem;
    margin: 2.5rem 0;
    padding: 0;
    list-style: none;
}

.course-facts li {
    display: flex;
    flex-direction: column;
    gap: .25rem;
    padding: 1rem 1.25rem;
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-accent);
    border-radius: var(--radius-sm);
    background-color: var(--color-surface);
}

.course-facts span {
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--color-text-subtle);
}

.course-facts strong {
    font-weight: 600;
}

.btn--ghost {
    color: var(--color-text);
    background-color: transparent;
    border: 1px solid var(--color-border);
}

.btn--ghost:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Tarjetas */
.course-grid {
    display: grid;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .course-grid--2 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1200px) {
    .course-grid { grid-template-columns: repeat(3, 1fr); }
    .course-grid--2 { grid-template-columns: repeat(2, 1fr); }
}

.course-card {
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
}

.course-card--accent {
    border-color: var(--color-border-accent);
}

.course-card__tag {
    align-self: flex-start;
    margin-bottom: 1rem;
    padding: .2rem .65rem;
    border-radius: 999px;
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--color-on-accent);
    background-color: var(--color-accent);
}

.course-card__tag--muted {
    color: var(--color-text);
    background-color: var(--color-surface-2);
    border: 1px solid var(--color-border);
}

.course-card__title {
    margin-bottom: 1rem;
    font-size: 1.35rem;
    font-weight: 700;
}

.course-card__text {
    margin-bottom: 1rem;
    color: var(--color-text-muted);
}

.course-card__note {
    margin-top: auto;
    padding-top: 1.5rem;
    font-size: .95rem;
    color: var(--color-accent);
}

.course-list {
    display: grid;
    gap: .85rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.course-list li {
    position: relative;
    padding-left: 1.5rem;
    color: var(--color-text-muted);
}

.course-list li::before {
    content: "";
    position: absolute;
    top: .6em;
    left: 0;
    width: .5rem;
    height: .5rem;
    border-radius: 50%;
    background-color: var(--color-accent);
}

.course-list strong {
    color: var(--color-text);
}

/* Secuencia */
.course-steps {
    display: grid;
    gap: 1.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
    counter-reset: none;
}

@media (min-width: 768px)  { .course-steps { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1200px) { .course-steps { grid-template-columns: repeat(4, 1fr); } }

.course-step {
    position: relative;
    padding: 2rem 1.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
}

.course-step h3 {
    margin: 1rem 0 .5rem;
    font-size: 1.15rem;
    font-weight: 700;
}

.course-step p {
    color: var(--color-text-muted);
}

.course-step__num {
    display: inline-grid;
    place-items: center;
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 50%;
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--color-on-accent);
    background-color: var(--color-accent);
}

.course-step--loop {
    border-color: var(--color-border-accent);
}

/* Flecha entre pasos en escritorio */
@media (min-width: 1200px) {
    .course-step:not(:last-child)::after {
        content: "→";
        position: absolute;
        top: 2.6rem;
        right: -1.15rem;
        z-index: 1;
        font-size: 1.25rem;
        color: var(--color-accent);
    }
}


/* Solapas de cursos + paginador
   ========================================================================== */

.tabs__list {
    display: flex;
    justify-content: center;
    gap: .5rem;
    width: fit-content;
    margin: 0 auto 3rem;
    padding: .35rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background-color: var(--color-surface);
}

.tabs__tab {
    padding: .65rem 1.5rem;
    border: 0;
    border-radius: 999px;
    font: inherit;
    font-weight: 600;
    color: var(--color-text-muted);
    background: transparent;
    cursor: pointer;
    transition: color .2s ease, background-color .2s ease;
}

.tabs__tab:hover {
    color: var(--color-text);
}

.tabs__tab[aria-selected="true"] {
    color: var(--color-on-accent);
    background-color: var(--color-accent);
}

.tabs__panel:focus-visible {
    outline-offset: 1rem;
}

.tabs__panel:not([hidden]) {
    animation: tabs-in .35s ease;
}

@keyframes tabs-in {
    from { opacity: 0; transform: translateY(.5rem); }
    to   { opacity: 1; transform: none; }
}

.pager__grid {
    display: grid;
    gap: 3rem 1.5rem;
}

.pager__grid .service {
    max-width: none;
    margin: 0;
    padding-top: 0;
    display: flex;
    flex-direction: column;
}

.pager__grid .service .hero__actions {
    margin-top: auto;
    padding-top: 1.5rem;
}

@media (min-width: 768px)  { .pager__grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1200px) { .pager__grid { grid-template-columns: repeat(3, 1fr); } }

.pager__nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    margin-top: 3rem;
}

.pager__nav[hidden] {
    display: none;
}

.pager__btn {
    display: grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    border: 1px solid var(--color-border-accent);
    border-radius: 50%;
    color: var(--color-accent);
    background-color: var(--color-surface);
    cursor: pointer;
    transition: background-color .2s ease, color .2s ease, opacity .2s ease;
}

.pager__btn:hover:not(:disabled) {
    color: var(--color-on-accent);
    background-color: var(--color-accent);
}

.pager__btn:disabled {
    opacity: .3;
    cursor: default;
}

.pager__status {
    min-width: 3.5rem;
    text-align: center;
    font-variant-numeric: tabular-nums;
    color: var(--color-text-muted);
}

.pager__grid .service.is-entering {
    animation: tabs-in .35s ease;
}

.pager { scroll-margin-top: calc(var(--nav-height) + 4rem); }

/* Antes de que cargue el JS, mostrar solo los primeros 6 */
.js .pager:not(.is-ready) .pager__grid > :nth-child(n+7) { display: none; }

/* El display:flex de las tarjetas pisaba el atributo hidden */
.pager__grid > [hidden] { display: none !important; }


/* 14b. Footer — links de comunidad
   ========================================================================== */

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-block: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.footer-links__title {
    font-size: .875rem;
    font-weight: 600;
    color: var(--color-text);
}

.footer-links__list {
    display: flex;
    flex-direction: column;
    gap: .75rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.footer-links__list a {
    font-size: .875rem;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-links__list a:hover,
.footer-links__list a:focus-visible {
    color: var(--color-accent);
}

@media (min-width: 768px) {
    .footer-links {
        flex-direction: row;
        align-items: center;
        gap: 2.5rem;
    }

    .footer-links__list {
        flex-direction: row;
        gap: 2rem;
    }
}


/* 17. Equipo docente (quienes.php)
   ========================================================================== */

.team {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: 1fr;
    margin: 0;
    padding: 0;
    list-style: none;
}

@media (min-width: 576px)  { .team { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 992px)  { .team { grid-template-columns: repeat(3, 1fr); } }

.teacher {
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
    padding: 2rem 1.5rem;
    text-align: center;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition);
}

.teacher:hover { border-color: var(--color-border-accent); }

.teacher__photo {
    width: 140px;
    height: 140px;
    margin-bottom: 1.25rem;
    object-fit: cover;
    border-radius: 50%;
    border: 3px solid var(--color-accent);
    background-color: var(--color-surface-2);
}

.teacher__photo--empty {
    display: grid;
    place-items: center;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-accent);
}

.teacher__name {
    margin: 0 0 1rem;
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.3;
}

.teacher__bio {
    margin: 0;
    color: var(--color-text-muted);
    font-size: .95rem;
    line-height: 1.65;
}

.teacher__bio + .teacher__bio { margin-top: .75rem; }

.teacher__social {
    order: 0;
    flex-wrap: wrap;
    justify-content: center;
    gap: .6rem;
    margin: auto 0 0;
    padding: 1.5rem 0 0;
    list-style: none;
}