/* ==========================================================================
   CUBICO — sistema de diseño
   Superficie de hormigón mediotono, arquitectura blanca recortada encima.
   ========================================================================== */

/* --- Tipografías autoalojadas (sin CDN, sin cesión de IP a terceros) ------ */

@font-face {
  font-family: 'Petrona';
  src: url('../fonts/petrona-latin.woff2') format('woff2');
  font-weight: 400 900;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Petrona';
  src: url('../fonts/petrona-latin-ext.woff2') format('woff2');
  font-weight: 400 900;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: 'Archivo';
  src: url('../fonts/archivo-latin.woff2') format('woff2');
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Archivo';
  src: url('../fonts/archivo-latin-ext.woff2') format('woff2');
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020,
    U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* --- Tokens -------------------------------------------------------------- */

:root {
  /* Superficie. El hormigón es el suelo de la marca, no un fondo neutro.
     Todo lo que Cubico construye es blanco: sobre gris medio, recorta. */
  --stone: oklch(0.635 0.005 245);
  --stone-lift: oklch(0.685 0.004 245);
  --stone-sink: oklch(0.565 0.006 245);
  --bone: oklch(0.965 0.003 245);
  --ink: oklch(0.185 0.008 245);
  --void: oklch(0.135 0.006 245);

  /* Medido en navegador sobre --stone: tinta 5.44:1, tinta suave 4.62:1.
     Ambos pasan AA para cuerpo de texto. */
  --ink-soft: oklch(0.248 0.008 245);
  /* Sobre superficies oscuras */
  --bone-soft: oklch(0.795 0.004 245);

  --rule: color-mix(in oklch, var(--ink) 22%, transparent);
  --rule-strong: color-mix(in oklch, var(--ink) 42%, transparent);

  --font-display: 'Petrona', 'Iowan Old Style', Georgia, serif;
  --font-sans: 'Archivo', system-ui, -apple-system, 'Helvetica Neue', sans-serif;

  /* Escala fluida, razón ~1.33 */
  --t-xs: 0.75rem;
  --t-sm: 0.875rem;
  --t-base: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  --t-md: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --t-lg: clamp(1.75rem, 1.5rem + 1.2vw, 2.5rem);
  --t-xl: clamp(2.5rem, 1.9rem + 3vw, 4.5rem);
  --t-2xl: clamp(3.25rem, 2rem + 6vw, 6rem);

  /* Ritmo */
  --gap: clamp(1rem, 0.6rem + 2vw, 2rem);
  --pad: clamp(1.25rem, 0.5rem + 3.5vw, 4.5rem);
  --band: clamp(4.5rem, 2rem + 11vw, 11rem);
  --measure: 68ch;

  --ease: cubic-bezier(0.22, 1, 0.36, 1); /* out-quint */
  --dur: 520ms;

  --z-sticky: 100;
  --z-header: 200;
  --z-overlay: 300;
  --z-dialog: 400;
}

/* --- Base ---------------------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--stone);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--t-base);
  line-height: 1.6;
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.022em;
  text-wrap: balance;
  margin: 0;
}

p { margin: 0; text-wrap: pretty; }

a { color: inherit; }

:where(a, button, input, textarea, select, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  border-radius: 1px;
}
.on-dark :where(a, button, input, textarea, select):focus-visible {
  outline-color: var(--bone);
}

::selection { background: var(--ink); color: var(--bone); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  top: 0; left: 0;
  z-index: calc(var(--z-header) + 1);
  padding: 0.75rem 1.25rem;
  background: var(--ink);
  color: var(--bone);
  font-size: var(--t-sm);
  transform: translateY(-110%);
  transition: transform 180ms var(--ease);
}
.skip-link:focus-visible { transform: translateY(0); }

/* --- Utilidades de composición ------------------------------------------- */

.shell {
  width: min(100% - var(--pad) * 2, 92rem);
  margin-inline: auto;
}

.band { padding-block: var(--band); }

.on-dark {
  background: var(--void);
  color: var(--bone);
}
.on-dark h1, .on-dark h2, .on-dark h3 { color: var(--bone); }
.on-dark p { color: var(--bone-soft); }
/* Texto claro sobre oscuro pesa menos: más aire entre líneas. */
.on-dark { line-height: 1.68; }

.on-light { background: var(--bone); color: var(--ink); }

.lede {
  font-size: var(--t-md);
  line-height: 1.45;
  max-width: 34ch;
  font-weight: 400;
}

.prose {
  max-width: var(--measure);
  display: grid;
  gap: 1.15em;
  color: var(--ink-soft);
}
.on-dark .prose { color: var(--bone-soft); }

.rule { border: 0; border-top: 1px solid var(--rule); margin: 0; }

/* --- Cabecera ------------------------------------------------------------ */

.masthead {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding: clamp(1rem, 2vw, 1.75rem) var(--pad);
  color: var(--bone);
  background: transparent;
  transition: background-color 320ms var(--ease), padding 320ms var(--ease);
}

/* Sobre la fotografía de apertura el logo va suelto. En cuanto el hormigón
   entra en pantalla la cabecera necesita suelo propio, o el logo blanco se
   pierde sobre el gris. */
.masthead--solid,
.masthead[data-stuck='true'] {
  background: var(--void);
}
.masthead[data-stuck='true'] {
  padding-block: clamp(0.6rem, 1.2vw, 0.9rem);
}

@media (prefers-reduced-motion: reduce) {
  .masthead { transition: none; }
}

.masthead :is(a, button):focus-visible { outline-color: var(--bone); }

/* Sin apertura fotográfica, la cabecera fija tapa el principio del contenido. */
body:not(.is-immersive) main { padding-block-start: 5.5rem; }

/* Marca dónde termina la apertura, para saber cuándo asentar la cabecera. */
.masthead-sentinel {
  position: absolute;
  inset-block-start: 88svh;
  block-size: 1px;
  inline-size: 1px;
  pointer-events: none;
}

.masthead__logo img { width: clamp(112px, 12vw, 168px); }

.nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2.25rem);
  font-size: var(--t-sm);
  letter-spacing: 0.01em;
}
.nav a {
  text-decoration: none;
  padding-block: 0.35rem;
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease);
}
.nav a:hover { border-bottom-color: currentColor; }
.nav a[aria-current='page'] { border-bottom-color: currentColor; }

.lang {
  display: flex;
  gap: 0.4rem;
  font-size: var(--t-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.85;
}
.lang [aria-current='true'] { font-weight: 700; opacity: 1; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid currentColor;
  color: inherit;
  font: inherit;
  font-size: var(--t-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
}

@media (max-width: 52rem) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    flex-direction: column;
    justify-content: center;
    background: var(--void);
    font-size: var(--t-lg);
    font-family: var(--font-display);
    gap: 1.25rem;
    translate: 0 -100%;
    transition: translate 420ms var(--ease);
  }
  .nav[data-open='true'] { translate: 0 0; }
  @media (prefers-reduced-motion: reduce) {
    .nav { transition: none; }
  }
}

/* --- Portada: apertura --------------------------------------------------- */

.opening {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-content: end;
  padding: var(--pad);
  padding-block-end: clamp(2.5rem, 6vw, 5rem);
  overflow: clip;
  background: var(--void);
  color: var(--bone);
}

.opening__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.opening__media img,
.opening__media video {
  width: 100%; height: 100%;
  object-fit: cover;
}
/* Velo: la fotografía es de alta clave, el texto blanco necesita apoyo. */
.opening__media::after {
  content: '';
  position: absolute;
  inset: 0;
  /* La fotografía de Cubico es de alta clave: los volúmenes son blancos y el
     sol pega fuerte. Sin un velo firme arriba, el logotipo blanco desaparece. */
  background: linear-gradient(
    to top,
    oklch(0.135 0.006 245 / 0.82) 0%,
    oklch(0.135 0.006 245 / 0.45) 32%,
    oklch(0.135 0.006 245 / 0.12) 58%,
    oklch(0.135 0.006 245 / 0.48) 88%,
    oklch(0.135 0.006 245 / 0.62) 100%
  );
}

.opening__body {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.opening__title {
  font-size: var(--t-2xl);
  letter-spacing: -0.035em;
  max-width: 18ch;
}

.opening__meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: clamp(1rem, 3vw, 2.5rem);
  margin: 0;
  font-size: var(--t-sm);
  color: var(--bone-soft);
  border-top: 1px solid color-mix(in oklch, var(--bone) 28%, transparent);
  padding-top: 1.25rem;
  max-width: 64rem;
}
.opening__meta div { display: grid; gap: 0.15rem; }
.opening__meta dt { line-height: 1.35; }
.opening__meta dd { margin: 0; }
.opening__meta b {
  display: block;
  font-family: var(--font-display);
  font-size: var(--t-lg);
  font-weight: 700;
  color: var(--bone);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

/* --- Índice de proyectos -------------------------------------------------
   Nada de rejilla de tarjetas: un índice de obra. Cada fila es una línea
   tipográfica que revela su fotografía al apuntarla.
   ------------------------------------------------------------------------ */

.index { position: relative; }

.index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.index__item { border-bottom: 1px solid var(--rule); }

.index__link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: var(--gap);
  padding-block: clamp(1.1rem, 2.4vw, 2rem);
  text-decoration: none;
  position: relative;
  transition: padding-inline-start 420ms var(--ease);
}
.index__link:hover,
.index__link:focus-visible { padding-inline-start: clamp(0.75rem, 2vw, 2rem); }

.index__name {
  font-family: var(--font-display);
  font-size: var(--t-xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

.index__region {
  font-size: var(--t-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}

/* La fotografía sigue al puntero. En táctil y teclado no aparece: la fila
   ya es un destino completo por sí sola. */
.index__preview {
  position: fixed;
  z-index: var(--z-sticky);
  width: min(30vw, 26rem);
  aspect-ratio: 4 / 3;
  pointer-events: none;
  opacity: 0;
  translate: -50% -50%;
  scale: 0.96;
  transition: opacity 320ms var(--ease), scale 420ms var(--ease);
  overflow: clip;
  background: var(--stone-sink);
}
.index__preview img { width: 100%; height: 100%; object-fit: cover; }
.index__preview[data-visible='true'] { opacity: 1; scale: 1; }

@media (hover: none), (prefers-reduced-motion: reduce) {
  .index__preview { display: none; }
}

/* --- Pilares de calidad --------------------------------------------------
   Cuatro nombres, no cuatro tarjetas. Bandas anchas separadas por filete.
   ------------------------------------------------------------------------ */

.pillars { display: grid; }

.pillar {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem var(--gap);
  padding-block: clamp(1.75rem, 3.5vw, 3rem);
  border-top: 1px solid var(--rule);
}
.pillar:last-child { border-bottom: 1px solid var(--rule); }

@media (min-width: 48rem) {
  .pillar {
    grid-template-columns: minmax(14rem, 22%) minmax(0, 1fr);
    align-items: start;
  }
}

.pillar__name {
  font-family: var(--font-display);
  font-size: var(--t-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

.pillar__text {
  max-width: 56ch;
  color: var(--ink-soft);
}

/* --- Bloque de texto de empresa ------------------------------------------ */

.statement {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
}
@media (min-width: 60rem) {
  .statement { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); align-items: start; }
}

.statement__title {
  font-size: var(--t-xl);
  letter-spacing: -0.03em;
  max-width: 16ch;
}

/* --- Página de proyecto -------------------------------------------------- */

.project-hero {
  position: relative;
  min-height: 92svh;
  display: grid;
  align-content: end;
  padding: var(--pad);
  padding-block-end: clamp(2.5rem, 6vw, 4.5rem);
  overflow: clip;
  background: var(--void);
  color: var(--bone);
}
/* Proyecto todavía sin fotografía: cabecera compacta sobre hormigón. Ocupa lo
   que necesita y nada más, en vez de dejar una pantalla vacía. */
.project-hero--bare {
  min-height: 0;
  background: var(--stone);
  color: var(--ink);
  padding-block: var(--band);
  border-bottom: 1px solid var(--rule);
}
.project-hero--bare .project-hero__title { color: var(--ink); }
.project-hero--bare .project-hero__region { color: var(--ink-soft); }

.project-hero__media { position: absolute; inset: 0; }
.project-hero__media img { width: 100%; height: 100%; object-fit: cover; }
.project-hero__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    oklch(0.135 0.006 245 / 0.78) 0%,
    oklch(0.135 0.006 245 / 0.28) 45%,
    oklch(0.135 0.006 245 / 0.46) 86%,
    oklch(0.135 0.006 245 / 0.62) 100%
  );
}
.project-hero__body { position: relative; z-index: 1; display: grid; gap: 0.75rem; }
.project-hero__title {
  font-size: var(--t-2xl);
  letter-spacing: -0.035em;
}
.project-hero__region {
  font-size: var(--t-sm);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone-soft);
}

/* Cita a sangre: la frase de la promotora, sin comillas decorativas. */
.pullquote {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 1rem + 3.2vw, 3.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  max-width: 24ch;
  text-wrap: balance;
}

/* Galería: mosaico deliberado, no carrusel. Tamaños desiguales para ritmo. */
.gallery {
  display: grid;
  gap: clamp(0.5rem, 1.2vw, 1rem);
  grid-template-columns: repeat(6, 1fr);
}
.gallery figure { margin: 0; grid-column: span 6; }
.gallery img { width: 100%; height: 100%; object-fit: cover; }

@media (min-width: 48rem) {
  .gallery figure { grid-column: span 3; }
  .gallery figure:nth-child(6n + 1) { grid-column: span 6; }
  .gallery figure:nth-child(6n + 4) { grid-column: span 2; }
  .gallery figure:nth-child(6n + 5) { grid-column: span 4; }
}

/* --- Calidades: el dato es el lujo ---------------------------------------
   Documento de especificación, no acordeón decorativo. Índice pegajoso a la
   izquierda, especificaciones a la derecha.
   ------------------------------------------------------------------------ */

.specs { display: grid; gap: var(--band) var(--gap); }

@media (min-width: 62rem) {
  .specs { grid-template-columns: minmax(12rem, 18%) minmax(0, 1fr); gap: var(--gap); }
  .specs__nav {
    position: sticky;
    top: clamp(1.5rem, 6vw, 5rem);
    align-self: start;
  }
}

.specs__nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
  font-size: var(--t-sm);
}
.specs__nav a {
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 200ms var(--ease);
}
.specs__nav a:hover { color: var(--ink); }
.specs__nav a[data-active='true'] { color: var(--ink); font-weight: 700; }

.spec-group { border-top: 1px solid var(--rule-strong); padding-block: clamp(1.5rem, 3vw, 2.5rem); }
.spec-group:first-child { border-top: 0; padding-block-start: 0; }

.spec-group__title {
  font-family: var(--font-display);
  font-size: var(--t-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-block-end: clamp(1rem, 2vw, 1.75rem);
}

.spec-list {
  display: grid;
  gap: clamp(1.25rem, 2.5vw, 2rem);
}

.spec {
  display: grid;
  gap: 0.4rem var(--gap);
}
@media (min-width: 44rem) {
  .spec { grid-template-columns: minmax(9rem, 26%) minmax(0, 1fr); }
}

.spec__term {
  font-size: var(--t-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  line-height: 1.35;
}
.spec__desc { color: var(--ink-soft); max-width: 62ch; }

/* --- Contacto ------------------------------------------------------------ */

.contact { display: grid; gap: clamp(2rem, 5vw, 4rem); }
@media (min-width: 60rem) {
  .contact { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
}

.contact__title { font-size: var(--t-xl); letter-spacing: -0.03em; max-width: 14ch; }

.form { display: grid; gap: 1.5rem; }

.field { display: grid; gap: 0.45rem; }

.field label {
  font-size: var(--t-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
}

.field :is(input, select, textarea) {
  font: inherit;
  font-size: var(--t-base);
  color: var(--bone);
  background: transparent;
  border: 0;
  border-bottom: 1px solid color-mix(in oklch, var(--bone) 40%, transparent);
  padding: 0.7rem 0;
  transition: border-color 200ms var(--ease);
}
.field :is(input, select, textarea):hover { border-bottom-color: var(--bone); }
.field :is(input, textarea)::placeholder {
  /* El gris tenue de placeholder es la trampa habitual: aquí llega a 4.6:1. */
  color: var(--bone-soft);
  opacity: 1;
}
.field select option { color: var(--ink); }

.field__hint { font-size: var(--t-xs); color: var(--bone-soft); }

.button {
  justify-self: start;
  font: inherit;
  font-size: var(--t-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--bone);
  color: var(--ink);
  border: 1px solid var(--bone);
  padding: 1rem 2.25rem;
  cursor: pointer;
  transition: background 220ms var(--ease), color 220ms var(--ease);
}
.button:hover { background: transparent; color: var(--bone); }

.button--ink {
  background: var(--ink);
  color: var(--bone);
  border-color: var(--ink);
}
.button--ink:hover { background: transparent; color: var(--ink); }

/* --- Pie ----------------------------------------------------------------- */

.colophon {
  display: grid;
  gap: var(--gap);
  padding: var(--band) var(--pad) clamp(2rem, 4vw, 3rem);
}
@media (min-width: 48rem) {
  .colophon { grid-template-columns: auto 1fr auto; align-items: end; }
}
.colophon img { width: clamp(120px, 14vw, 180px); }
.colophon__legal { font-size: var(--t-xs); color: var(--bone-soft); }
.colophon__legal a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

/* --- Aparición al entrar en pantalla -------------------------------------
   Regla estricta: el contenido es visible por defecto. La animación sólo se
   activa si JS confirma soporte, para que nunca se quede una sección en
   blanco en un render sin JS o en una pestaña oculta.
   ------------------------------------------------------------------------ */

[data-reveal] { opacity: 1; }

.js-reveal [data-reveal] {
  opacity: 0;
  translate: 0 1.5rem;
  transition: opacity 700ms var(--ease), translate 700ms var(--ease);
}
.js-reveal [data-reveal][data-shown='true'] {
  opacity: 1;
  translate: 0 0;
}

@media (prefers-reduced-motion: reduce) {
  .js-reveal [data-reveal] { opacity: 1; translate: none; transition: none; }
}