/*
 * Estilos de la landing (ADR-072 §4.1, ADR-074 §4.4-§4.5). Escritos a mano, sin importar nada de apps/web.
 * Identidad propia de AdagioX: tinta índigo sobre fondos casi blancos (o su variante oscura) y un
 * único acento. Todos los pares texto/fondo cumplen WCAG 2.2 AA (>= 4,5:1; los de texto corriente
 * superan 7:1). Sin fuentes ni recursos de terceros; CSP: style-src 'self'.
 */
:root {
  color-scheme: light dark;
  --background: oklch(0.99 0.004 270);
  --foreground: oklch(0.2 0.04 270);
  --muted-foreground: oklch(0.42 0.035 270);
  --surface: oklch(0.965 0.012 270);
  --surface-strong: oklch(0.93 0.025 270);
  --border: oklch(0.87 0.02 270);
  --input: oklch(0.62 0.04 270);
  --brand: oklch(0.45 0.19 272);
  --brand-hover: oklch(0.38 0.19 272);
  --brand-foreground: oklch(0.99 0 0);
  --accent: oklch(0.72 0.15 55);
  --hero-glow: oklch(0.92 0.06 280);
  --shadow: 0 1.25rem 2.5rem -1rem oklch(0.25 0.1 272 / 35%);
  --ring: var(--brand);
  --radius: 0.75rem;
  --font-sans: system-ui, 'Segoe UI', Roboto, sans-serif;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --gutter: max(var(--space-4), calc((100% - 64rem) / 2 + var(--space-4)));
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: oklch(0.17 0.03 270);
    --foreground: oklch(0.96 0.01 270);
    --muted-foreground: oklch(0.78 0.03 270);
    --surface: oklch(0.22 0.035 270);
    --surface-strong: oklch(0.27 0.045 270);
    --border: oklch(0.34 0.045 270);
    --input: oklch(0.6 0.05 270);
    --brand: oklch(0.8 0.12 275);
    --brand-hover: oklch(0.88 0.09 275);
    --brand-foreground: oklch(0.18 0.04 270);
    --hero-glow: oklch(0.3 0.09 275);
    --shadow: 0 1.25rem 2.5rem -1rem oklch(0 0 0 / 60%);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 64rem;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

a {
  color: var(--foreground);
  text-underline-offset: 0.2em;
}

a:focus-visible,
main:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
  border-radius: 2px;
}

main:focus {
  outline: none;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--primary);
  color: var(--primary-foreground);
  border-radius: var(--radius);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
  z-index: 10;
}

.site-header {
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-4);
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
}

.lang-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.lang-list a[aria-current='page'] {
  font-weight: 700;
}

main {
  padding-block: 0 var(--space-8);
}

/* ---------- Cabecera (hero) ---------- */

.hero {
  position: relative;
  isolation: isolate;
  padding-block: var(--space-12) var(--space-8);
  background: radial-gradient(60rem 28rem at 85% -10%, var(--hero-glow), transparent 70%);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0 0 auto;
  z-index: -1;
  height: 32rem;
  background: url('/img/hero-bg.svg') center top / cover no-repeat;
  mask-image: linear-gradient(to bottom, #000 30%, transparent);
}

.hero-copy {
  max-width: 64rem;
}

h1 {
  max-width: 22ch;
  margin: 0 0 var(--space-4);
  font-size: clamp(2.125rem, 6.5vw, 3.75rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

h2 {
  margin: var(--space-12) 0 var(--space-3);
  font-size: clamp(1.5rem, 3.6vw, 2.125rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.25rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.lead {
  max-width: 40rem;
  margin: 0 0 var(--space-6);
  font-size: clamp(1.0625rem, 2.4vw, 1.3125rem);
  line-height: 1.55;
  color: var(--muted-foreground);
}

.note {
  max-width: 42rem;
  margin: 0;
  color: var(--muted-foreground);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0 0 var(--space-6);
  padding: var(--space-1) var(--space-4);
  background: var(--surface);
  border: 1px solid var(--input);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
}

.badge::before {
  content: '';
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-6);
  border: 2px solid var(--brand);
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--brand);
  color: var(--brand-foreground);
}

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

.btn-secondary {
  background: transparent;
  color: var(--foreground);
}

.btn-secondary:hover {
  background: var(--surface-strong);
}

a.btn:focus-visible {
  outline-offset: 3px;
}

/* ---------- Carrusel (ADR-074 §4.5, ADR-075): usable sin JavaScript; con él, controles añadidos ---------- */

.carousel {
  margin-top: var(--space-12);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: var(--gutter);
  scrollbar-width: thin;
  scrollbar-color: var(--input) transparent;
  padding-block: var(--space-2) var(--space-6);
  /* Reserva el hueco de la barra de controles (los crea el script): sin ella, la página saltaría al cargarlo. */
  margin-bottom: 3.5rem;
}

.carousel:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: -3px;
  border-radius: var(--radius);
}

.slides {
  display: flex;
  gap: var(--space-6);
  margin: 0;
  padding: 0 var(--gutter);
  list-style: none;
  width: max-content;
}

.slide {
  flex: 0 0 min(84vw, 44rem);
  scroll-snap-align: start;
}

.slide figure {
  margin: 0;
}

.slide figcaption {
  margin-top: var(--space-3);
  max-width: 40rem;
  color: var(--muted-foreground);
  font-size: 0.9375rem;
}

/* Controles del carrusel (ADR-075 §2): los crea carousel.js, así que sin JavaScript no existen. */
.carousel-frame {
  position: relative;
  display: flow-root;
}

.carousel-arrow,
.carousel-dot,
.carousel-pause {
  font: inherit;
  cursor: pointer;
}

.carousel-arrow {
  position: absolute;
  /* Centro de la ventana de la primera diapositiva: margen y relleno del carrusel, barra de título de 2rem
     y la imagen (proporción 16:10) a la anchura de .slide. */
  top: calc(var(--space-12) + var(--space-2) + (min(84vw, 44rem) * 0.625 + 2rem) / 2);
  z-index: 1;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 2px solid var(--input);
  border-radius: 50%;
  background: var(--surface);
  color: var(--foreground);
  box-shadow: var(--shadow);
  transform: translateY(-50%);
}

.carousel-arrow[data-dir='prev'] {
  inset-inline-start: max(var(--space-2), calc(var(--gutter) - 3.5rem));
}

.carousel-arrow[data-dir='next'] {
  inset-inline-end: max(var(--space-2), calc(var(--gutter) - 3.5rem));
}

/* Chevrón dibujado con bordes: no hay texto ni imagen, y se invierte solo con dir="rtl". */
.carousel-arrow::before {
  content: '';
  display: block;
  width: 0.75rem;
  height: 0.75rem;
  margin: auto;
  border: solid currentcolor;
  border-width: 0 0 3px 3px;
  transform: translateX(15%) rotate(45deg);
}

.carousel-arrow[data-dir='next']::before {
  transform: translateX(-15%) rotate(-135deg);
}

[dir='rtl'] .carousel-arrow::before {
  scale: -1 1;
}

.carousel-arrow:hover {
  background: var(--surface-strong);
}

.carousel-arrow:focus-visible,
.carousel-dot:focus-visible,
.carousel-pause:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
}

.carousel-bar {
  position: absolute;
  inset-inline: var(--gutter);
  bottom: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  column-gap: var(--space-2);
}

.carousel-pause {
  min-height: 2.75rem;
  margin-inline-end: var(--space-4);
  padding: var(--space-1) var(--space-4);
  border: 2px solid var(--brand);
  border-radius: 999px;
  background: transparent;
  color: var(--foreground);
  font-size: 0.875rem;
  font-weight: 600;
}

.carousel-pause[hidden] {
  display: none;
}

.carousel-pause:hover {
  background: var(--surface-strong);
}

.carousel-dot {
  position: relative;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 0;
  background: transparent;
}

/* El punto es el ::before; el botón mide 44 px para el dedo. */
.carousel-dot::before {
  content: '';
  position: absolute;
  inset: 50% auto auto 50%;
  width: 0.75rem;
  height: 0.75rem;
  border: 2px solid var(--muted-foreground);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.carousel-dot[aria-current='true']::before {
  width: 1rem;
  height: 1rem;
  border-color: var(--brand);
  background: var(--brand);
}

@media (max-width: 40rem) {
  .carousel {
    margin-bottom: 6.5rem;
  }

  .carousel-arrow {
    width: 2.75rem;
    height: 2.75rem;
    border-width: 1px;
    opacity: 0.88;
    box-shadow: none;
  }

  .carousel-bar {
    column-gap: 0;
  }

  .carousel-pause {
    margin-inline-end: 0;
  }
}

.hint {
  margin-block: 0;
  color: var(--muted-foreground);
  font-size: 0.875rem;
}

/* Marco de ventana de aplicación dibujado con CSS: no es una imagen. */
.window {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.window::before {
  content: '';
  display: block;
  height: 2rem;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(circle 0.3125rem at 1rem 50%, var(--input) 96%, transparent),
    radial-gradient(circle 0.3125rem at 2.25rem 50%, var(--input) 96%, transparent),
    radial-gradient(circle 0.3125rem at 3.5rem 50%, var(--input) 96%, transparent),
    var(--surface-strong);
}

.window picture,
.window img {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- Secciones de detalle ---------- */

.section {
  padding-block: var(--space-4);
}

.section-lead {
  max-width: 44rem;
  margin: 0 0 var(--space-8);
  color: var(--muted-foreground);
  font-size: 1.125rem;
}

.feature {
  display: grid;
  gap: var(--space-6);
  align-items: center;
  padding-block: var(--space-8);
  border-top: 1px solid var(--border);
}

.feature-text p {
  margin: 0 0 var(--space-4);
}

.ticks {
  display: grid;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.ticks li {
  position: relative;
  padding-inline-start: var(--space-8);
}

.ticks li::before {
  content: '';
  position: absolute;
  inset-inline-start: 0.375rem;
  top: 0.35em;
  width: 0.375rem;
  height: 0.75rem;
  border: solid var(--brand);
  border-width: 0 2px 2px 0;
  transform: rotate(40deg);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.card {
  padding: var(--space-6);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.card p {
  margin: 0;
  color: var(--muted-foreground);
}

.band {
  margin-block: var(--space-12);
  background: var(--surface);
  border-block: 1px solid var(--border);
}

.band-inner {
  padding-block: var(--space-8) var(--space-12);
}

.band-inner h2 {
  margin-top: var(--space-8);
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.pills li {
  padding: var(--space-2) var(--space-4);
  background: var(--background);
  border: 1px dashed var(--input);
  border-radius: 999px;
}

.closing {
  display: grid;
  gap: var(--space-8);
}

.closing h2 {
  margin-top: var(--space-4);
}

.closing p {
  margin: 0 0 var(--space-4);
}

@media (min-width: 48rem) {
  .hero {
    padding-block: var(--space-16) var(--space-12);
  }

  .feature {
    grid-template-columns: 1fr 1.15fr;
    gap: var(--space-12);
    padding-block: var(--space-12);
  }

  .feature:nth-of-type(even) .feature-media {
    order: -1;
  }

  .feature:nth-of-type(even) {
    grid-template-columns: 1.15fr 1fr;
  }

  .closing {
    grid-template-columns: 1fr 1fr;
  }
}

.prose {
  max-width: 48rem;
}

.prose h2 {
  margin-top: var(--space-8);
}

.prose h3 {
  margin-top: var(--space-6);
}

.prose dl {
  margin: 0 0 var(--space-4);
}

.prose dt {
  font-weight: 600;
}

.prose dd {
  margin: 0 0 var(--space-2);
  overflow-wrap: anywhere;
}

.site-footer {
  margin-top: var(--space-8);
  border-top: 1px solid var(--border);
  color: var(--muted-foreground);
}

.site-footer a {
  color: var(--foreground);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2) var(--space-6);
  padding-block: var(--space-6);
}

.footer-inner p {
  margin: 0;
}

/* ---------- Efectos de scroll (ADR-074 §4.5) ----------
 * Solo con movimiento permitido Y soporte de animation-timeline. Solo se anima transform:
 * sin soporte, o con reduce, el contenido está en su estado final desde el principio. */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    @keyframes rise {
      from {
        transform: translateY(2.5rem);
      }

      to {
        transform: translateY(0);
      }
    }

    @keyframes drift {
      from {
        transform: translateY(0);
      }

      to {
        transform: translateY(-4rem);
      }
    }

    .feature-media,
    .card {
      animation: rise linear both;
      animation-timeline: view();
      animation-range: entry 0% entry 70%;
    }

    .hero::before {
      animation: drift linear both;
      animation-timeline: scroll(root block);
      animation-range: 0 40rem;
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}