/* ══════════════════════════════════════════════════════════════════
   QUBITS — v0.3
   Fondo cálido derivado del ámbar de marca (H 38°). Navy como tinta.
   Una sola fuente variable, dos ejes: la anchura es el recurso expresivo.
   Microinteracciones con animation-timeline nativo. Sin librerías.
   ══════════════════════════════════════════════════════════════════ */

@font-face {
  font-family: "Saira";
  src: url("fonts/saira-var.woff2") format("woff2");
  font-weight: 400 800;
  font-stretch: 85% 125%;
  font-style: normal;
  font-display: swap;
}

:root {
  /* Fondo cálido — derivado del ámbar #FFD37A, no del crema por defecto */
  --ground:   #F0E3CC;   /* arena cálida                              */
  --ground-2: #E6D6B9;   /* banda alterna                             */

  /* Tintas — el sistema de marca intacto */
  --ink:       #103A4F;  /* navy de marca · 9.5:1 sobre ground        */
  --ink-soft:  #47606B;  /* 5.3:1 ground · 4.7:1 banda alterna        */
  --amber:     #FFD37A;  /* relleno; navy encima da 8.5:1             */
  --amber-ink: #7A4E0C;  /* ámbar apto para texto · 5.7:1             */
  --aqua:      #7FE3EF;  /* solo sobre navy · 8.1:1                   */
  --copro:     #0F577B;  /* submarca, H200 como el navy · 6.2 / 5.5   */
  --mark-ring: #15808E;  /* solo el anillo del isotipo (logo, exento) */

  --hair:      rgba(16, 58, 79, .18);
  --hair-dark: rgba(255, 211, 122, .22);

  --font: "Saira", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --header-h: 4.5rem;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --radius: 0px;
}

*, *::before, *::after { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1.5rem);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font);
  font-size: clamp(1rem, .4vw + .93rem, 1.13rem);
  line-height: 1.62;
  font-variation-settings: "wdth" 100;
  text-rendering: optimizeLegibility;
}

/* ── Accesibilidad ─────────────────────────────────────────────── */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--ink); color: var(--ground);
  padding: .9rem 1.4rem; text-decoration: none;
  font-variation-settings: "wdth" 88; letter-spacing: .1em;
  text-transform: uppercase; font-size: .8rem;
}
.skip-link:focus { left: 0; }
:focus-visible { outline: 2px solid var(--amber-ink); outline-offset: 3px; }
.section-dark :focus-visible, .site-footer :focus-visible { outline-color: var(--aqua); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ── Tipografía: la anchura es el recurso ──────────────────────── */
h1, h2, h3 { margin: 0; line-height: 1.02; letter-spacing: -.03em; text-wrap: balance; }
h1, h2 { font-weight: 700; font-variation-settings: "wdth" 116; }
h1 { font-size: clamp(2.5rem, 8.4vw, 6.6rem); max-width: 15ch; }
h2 { font-size: clamp(2rem, 5.6vw, 4.1rem); max-width: 18ch; }
h3 {
  font-weight: 600; font-size: clamp(1.15rem, 1.7vw, 1.4rem);
  line-height: 1.2; letter-spacing: -.015em; font-variation-settings: "wdth" 106;
}
p { margin: 0 0 1.1rem; max-width: 62ch; }
p:last-child { margin-bottom: 0; }
a { color: inherit; }

/* Etiquetas condensadas — el contraste con los titulares expandidos */
.eyebrow {
  font-variation-settings: "wdth" 87;
  font-size: .74rem; font-weight: 600; letter-spacing: .2em;
  text-transform: uppercase; color: var(--amber-ink);
  margin: 0 0 1.4rem;
}

/* ── Contenedores ──────────────────────────────────────────────── */
.container { width: 100%; max-width: 76rem; margin: 0 auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(4.5rem, 10vw, 8.5rem); position: relative; }
.section-alt  { background: var(--ground-2); }
.section-dark { background: var(--ink); color: var(--ground); }
.section-dark .eyebrow { color: var(--aqua); }
.section-heading { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-heading > p { margin-top: 1.25rem; color: var(--ink-soft); }
.section-dark .section-heading > p { color: rgba(240, 227, 204, .78); }
.section-tail { margin-top: clamp(2.5rem, 4vw, 3.5rem); }

/* ── Cabecera ──────────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--ground);
  border-bottom: 1px solid transparent;
  transition: border-color .25s, background .25s;
}
.site-header.is-stuck { border-bottom-color: var(--hair); }
.nav-shell { display: flex; align-items: center; gap: 1.5rem; min-height: var(--header-h); }

.brand { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; }
.brand-word {
  font-weight: 700; font-size: 1.1rem;
  letter-spacing: .16em; font-variation-settings: "wdth" 108;
}
.brand-mark { width: 32px; height: 27px; flex: none; overflow: visible; }
.brand-mark .bm-ring   { stroke: var(--mark-ring); }
.brand-mark .bm-vector {
  stroke: var(--ink);
  stroke-dasharray: 60; stroke-dashoffset: 0;
  transition: stroke-dashoffset .5s ease;
}
.brand-mark circle { fill: var(--ink); }
.brand:hover .bm-vector { stroke-dashoffset: 60; }

.primary-nav { margin-left: auto; display: flex; align-items: center; gap: 1.75rem; }
.primary-nav > a:not(.btn) {
  text-decoration: none; color: var(--ink-soft);
  font-size: .88rem; font-variation-settings: "wdth" 94;
  padding-block: .35rem; border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.primary-nav > a:not(.btn):hover,
.primary-nav > a:not(.btn):focus-visible { color: var(--ink); border-bottom-color: var(--amber-ink); }

.nav-toggle {
  display: none; margin-left: auto; background: none; cursor: pointer;
  border: 1px solid var(--hair); padding: .6rem .7rem;
}
.nav-toggle span:not(.sr-only) {
  display: block; width: 20px; height: 2px; background: var(--ink); transition: transform .25s;
}
.nav-toggle span:not(.sr-only) + span:not(.sr-only) { margin-top: 5px; }
.nav-toggle[aria-expanded="true"] span:nth-of-type(1) { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-of-type(2) { transform: translateY(-3.5px) rotate(-45deg); }

/* ── Botones ───────────────────────────────────────────────────── */
.btn {
  display: inline-block; text-decoration: none; cursor: pointer;
  padding: .95rem 1.6rem; border: 1px solid var(--ink);
  font-size: .88rem; font-weight: 600; letter-spacing: .05em;
  font-variation-settings: "wdth" 96;
  transition: background .22s, color .22s, transform .22s, border-color .22s;
}
.btn-small { padding: .6rem 1.05rem; font-size: .8rem; }
.btn-primary { background: var(--ink); color: var(--ground); }
.btn-primary:hover { background: var(--amber); border-color: var(--amber); color: var(--ink); transform: translateY(-2px); }
.btn-secondary { background: transparent; color: var(--ink); }
.btn-secondary:hover { background: var(--ink); color: var(--ground); transform: translateY(-2px); }
.section-dark .btn-secondary { color: var(--ground); border-color: var(--ground); }
.section-dark .btn-secondary:hover { background: var(--ground); color: var(--ink); }
.btn-disabled { opacity: .45; cursor: not-allowed; pointer-events: none; }

.text-link {
  text-decoration: none; font-weight: 600; color: var(--amber-ink);
  border-bottom: 1px solid currentColor; padding-bottom: .15rem; transition: color .2s;
}
.text-link:hover { color: var(--ink); }

/* ── Hero ──────────────────────────────────────────────────────── */
.hero { padding-block: clamp(4rem, 11vw, 9rem) clamp(4rem, 8vw, 7rem); overflow: hidden; }
.hero-grid {
  position: absolute; inset: 0; pointer-events: none; opacity: .5;
  --cell: 62px;
  background-image:
    repeating-linear-gradient(30deg,  var(--hair) 0 1px, transparent 1px var(--cell)),
    repeating-linear-gradient(150deg, var(--hair) 0 1px, transparent 1px var(--cell)),
    repeating-linear-gradient(90deg,  var(--hair) 0 1px, transparent 1px var(--cell));
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0,0,0,.55) 52%, transparent 96%);
}
.hero-content { position: relative; }
.hero h1 span { color: var(--amber-ink); font-weight: 400; }
.hero-copy { margin-top: 1.9rem; font-size: clamp(1.05rem, 1.5vw, 1.3rem); color: var(--ink-soft); max-width: 44ch; }

.tag-list { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem; margin: 2.1rem 0 0; padding: 0; }
.tag-list li {
  border: 1px solid var(--hair); padding: .4rem .85rem;
  font-size: .78rem; letter-spacing: .1em; text-transform: uppercase;
  font-variation-settings: "wdth" 89; color: var(--ink-soft);
  transition: border-color .2s, color .2s;
}
.tag-list li:hover { border-color: var(--amber-ink); color: var(--amber-ink); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2.6rem; }

/* ── Copro ─────────────────────────────────────────────────────── */
.copro-card {
  display: grid; gap: 1.75rem; align-items: end;
  background: var(--ground); border: 1px solid var(--hair);
  border-left: 4px solid var(--copro);
  padding: clamp(1.75rem, 4vw, 3rem);
}
@media (min-width: 52rem) { .copro-card { grid-template-columns: minmax(0,1fr) auto; } }
.copro-eyebrow { color: var(--copro); }
.copro-card h3 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.copro-card h3 span { color: var(--ink-soft); font-weight: 400; }
.copro-card .lead { margin-top: 1rem; font-size: 1.1rem; }
.copro-card > div > p:last-child { color: var(--ink-soft); }
.copro-link {
  text-decoration: none; font-weight: 600; color: var(--copro);
  border-bottom: 1px solid currentColor; padding-bottom: .2rem; white-space: nowrap;
}
.copro-link:hover { color: var(--ink); }

/* ── Capacidades (banda navy) ──────────────────────────────────── */
.services-grid { display: grid; gap: 1px; background: var(--hair-dark); border: 1px solid var(--hair-dark); }
@media (min-width: 40rem) { .services-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 62rem) { .services-grid { grid-template-columns: repeat(3, 1fr); } }
.service-card { background: var(--ink); padding: clamp(1.6rem, 3vw, 2.4rem); transition: background .28s; }
.service-card:hover { background: #14465F; }
.service-index {
  display: block; font-size: .78rem; letter-spacing: .18em;
  font-variation-settings: "wdth" 87; color: var(--aqua); margin-bottom: 1.4rem;
}
.service-card h3 { color: var(--ground); }
.service-card p { margin-top: .8rem; color: rgba(240, 227, 204, .76); font-size: .97rem; }
.section-dark .text-link { color: var(--aqua); }
.section-dark .text-link:hover { color: var(--ground); }

/* ── Lab ───────────────────────────────────────────────────────── */
.lab-grid { display: grid; gap: clamp(1.25rem, 2.5vw, 1.75rem); }
@media (min-width: 48rem) { .lab-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 68rem) { .lab-grid { grid-template-columns: repeat(3, 1fr); } }
.lab-card {
  border: 1px solid var(--hair); padding: clamp(1.5rem, 3vw, 2.1rem);
  display: flex; flex-direction: column; position: relative;
  transition: border-color .25s, transform .25s;
}
.lab-card::after {
  content: ""; position: absolute; left: -1px; top: -1px; height: 3px;
  width: 0; background: var(--amber-ink); transition: width .35s ease;
}
.lab-card:hover { border-color: var(--ink-soft); transform: translateY(-3px); }
.lab-card:hover::after { width: calc(100% + 2px); }
.lab-meta {
  display: flex; flex-wrap: wrap; gap: .5rem 1rem; margin-bottom: 1.3rem;
  font-size: .72rem; letter-spacing: .16em; text-transform: uppercase;
  font-variation-settings: "wdth" 87; color: var(--amber-ink);
}
.lab-card > p { margin-top: .9rem; color: var(--ink-soft); font-size: .97rem; }
.lab-card .learning {
  margin-top: auto; padding-top: 1.3rem; border-top: 1px solid var(--hair);
  font-size: .89rem; color: var(--ink);
}
.lab-card .learning strong { font-weight: 600; }

/* ── Estudio ───────────────────────────────────────────────────── */
.studio-grid { display: grid; gap: clamp(1.75rem, 4vw, 3.5rem); align-items: start; }
@media (min-width: 56rem) { .studio-grid { grid-template-columns: minmax(0,1fr) minmax(0,1fr); } }
.studio-grid > p { font-size: clamp(1.05rem, 1.6vw, 1.28rem); }

/* ── Contacto: la banda ámbar, el punto más cálido de la página ── */
.contact { background: var(--amber); color: var(--ink); }
.contact .eyebrow { color: var(--amber-ink); }
.contact h2 { font-size: clamp(2.2rem, 7vw, 5.2rem); max-width: 14ch; }
.contact-shell > p { margin-top: 1.5rem; font-size: clamp(1.05rem, 1.6vw, 1.28rem); }
.contact .btn-primary { margin-top: 2.4rem; }
.contact .btn-primary:hover { background: var(--ground); border-color: var(--ink); color: var(--ink); }
.contact-note { margin-top: 1.4rem; font-size: .84rem; color: var(--amber-ink); font-variation-settings: "wdth" 92; }

/* ── Pie ───────────────────────────────────────────────────────── */
.site-footer { background: var(--ink); color: rgba(240, 227, 204, .82); padding-block: 2.75rem; }
.footer-shell { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; align-items: center; }
.footer-shell p { margin: 0; font-size: .85rem; max-width: none; font-variation-settings: "wdth" 94; }
.footer-shell a { color: var(--aqua); text-decoration: none; font-size: .85rem; }
.footer-shell a:hover { color: var(--ground); }

/* ── Microinteracciones: scroll nativo, cero JavaScript ────────── */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    .reveal {
      animation: reveal linear both;
      animation-timeline: view();
      animation-range: entry 4% cover 24%;
    }
    @keyframes reveal {
      from { opacity: 0; transform: translateY(1.5rem); }
      to   { opacity: 1; transform: none; }
    }
    .lab-card { animation-range: entry 2% cover 20%; }
    .hero-content { animation: none; opacity: 1; transform: none; }
  }
}

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 52rem) {
  .nav-toggle { display: block; }
  .primary-nav {
    position: fixed; inset: var(--header-h) 0 auto; margin: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--ground); border-bottom: 1px solid var(--hair);
    padding: 1rem var(--gutter) 2rem;
    transform: translateY(-120%); transition: transform .3s ease;
  }
  .primary-nav.is-open { transform: none; }
  .primary-nav > a { padding-block: .95rem; border-bottom: 1px solid var(--hair); }
  .primary-nav > a.btn { margin-top: 1.25rem; text-align: center; border: 1px solid var(--ink); }
  body.nav-open { overflow: hidden; }
  .hero h1 { font-size: clamp(2.3rem, 11vw, 3.4rem); }
}

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

/* ══════════════════════════════════════════════════════════════════
   Formulario de contacto, páginas legales y resultado del envío
   ══════════════════════════════════════════════════════════════════ */

/* ── El formulario es una carta: cuerpo y firma ────────────────── */
.letter { margin-top: clamp(2.5rem, 5vw, 3.5rem); max-width: 44rem; }

/* Trampa antispam: fuera de pantalla, no display:none (los bots lo leen) */
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* Cuerpo: margen izquierdo como el de una hoja escrita */
.letter-body { border-left: 3px solid var(--ink); padding-left: clamp(1rem, 2.5vw, 1.6rem); }
.letter-open {
  display: block; margin-bottom: .5rem;
  font-size: clamp(1.05rem, 1.9vw, 1.35rem);
  font-variation-settings: "wdth" 104; color: var(--amber-ink);
}
.letter-body textarea {
  display: block; width: 100%; font: inherit; color: var(--ink);
  font-size: clamp(1.1rem, 2.1vw, 1.45rem); line-height: 1.65;
  background: transparent; border: 0; padding: .2rem 0 .6rem;
  resize: vertical; min-height: 7.5rem;
  transition: background .2s;
}
.letter-body textarea::placeholder { color: transparent; }
@supports (field-sizing: content) {
  .letter-body textarea { field-sizing: content; resize: none; max-height: 26rem; }
}
.letter-help {
  display: block; margin-top: .6rem;
  font-size: .86rem; color: var(--amber-ink); max-width: 46ch;
}

/* Firma */
.letter-sign { margin-top: clamp(2.2rem, 4vw, 3rem); }
.sign-rule {
  margin: 0 0 1.4rem; display: flex; align-items: center; gap: 1rem;
  font-size: .72rem; letter-spacing: .2em; text-transform: uppercase;
  font-variation-settings: "wdth" 87; color: var(--amber-ink); max-width: none;
}
.sign-rule::after { content: ""; flex: 1; height: 1px; background: var(--ink); opacity: .3; }

.sign-fields { display: grid; gap: 1.6rem clamp(1.5rem, 4vw, 3rem); }
@media (min-width: 40rem) { .sign-fields { grid-template-columns: 1fr 1fr; } }
.sign-field { margin: 0; max-width: none; }
.sign-field label {
  display: block; margin-bottom: .3rem;
  font-size: .8rem; color: var(--amber-ink);
  font-variation-settings: "wdth" 96;
}
.sign-field input {
  display: block; width: 100%; font: inherit; color: var(--ink);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  background: transparent; border: 0; border-bottom: 2px solid var(--ink);
  padding: .35rem 0 .5rem; border-radius: 0;
  transition: border-bottom-width .18s, background .2s;
}

/* Foco: el trazo engorda y el papel se oscurece un punto.
   Nunca aclarar sobre ámbar — ese fue el error de la versión anterior. */
.letter-body textarea:focus,
.sign-field input:focus { background: rgba(16, 58, 79, .06); }
.sign-field input:focus { border-bottom-width: 3px; padding-bottom: .43rem; }
.letter-body:focus-within { border-left-width: 6px; margin-left: -3px; }

/* Autorización */
.letter-consent {
  display: grid; grid-template-columns: auto 1fr; gap: .8rem;
  align-items: start; margin: clamp(2rem, 3.5vw, 2.6rem) 0 0; max-width: 46ch;
}
.letter-consent input {
  width: 1.2rem; height: 1.2rem; margin: .2rem 0 0;
  accent-color: var(--ink); flex: none;
}
.letter-consent label { font-size: .93rem; line-height: 1.5; }
.letter-consent a { color: var(--ink); text-underline-offset: 3px; }

.btn-send { margin-top: 2.2rem; padding: 1.05rem 2.2rem; font-size: .95rem; }
.contact-note { max-width: none; }
.contact-note a { color: var(--ink); text-underline-offset: 3px; }

/* ── Páginas legales ───────────────────────────────────────────── */
.legal { padding-block: clamp(3rem, 7vw, 5.5rem); }
.legal-shell { max-width: 46rem; }
.legal h1 { font-size: clamp(1.9rem, 4.6vw, 3.1rem); max-width: 20ch; }
.legal-meta { margin-top: 1.4rem; color: var(--ink-soft); font-size: .92rem; line-height: 1.7; }
.legal h2 {
  font-size: clamp(1.2rem, 2.2vw, 1.5rem); margin: 3rem 0 1rem;
  font-variation-settings: "wdth" 106; letter-spacing: -.01em;
}
.legal ul { margin: 0 0 1.1rem; padding-left: 1.2rem; max-width: 62ch; }
.legal li { margin-bottom: .5rem; }
.legal-toc { margin: 2.5rem 0 1rem; border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair); padding: 1.3rem 0; }
.legal-toc ol { margin: 0; padding-left: 1.2rem; columns: 2; column-gap: 2.5rem; }
.legal-toc li { margin-bottom: .45rem; font-size: .92rem; }
.legal-toc a { color: var(--ink-soft); text-underline-offset: 3px; }
.legal-toc a:hover { color: var(--ink); }
@media (max-width: 40rem) { .legal-toc ol { columns: 1; } }
.legal-todo, .legal-review {
  border-left: 3px solid var(--amber-ink); background: var(--ground-2);
  padding: 1rem 1.2rem; font-size: .9rem; margin-top: 1.4rem; max-width: 62ch;
}
.legal-review { margin-top: 3.5rem; }
.legal-nav a { text-decoration: none; }

/* ── Resultado del envío ───────────────────────────────────────── */
.result-shell { min-height: 70vh; display: flex; align-items: center; }
.result-shell h1 { font-size: clamp(2rem, 6vw, 3.6rem); }
.result-shell p { margin-top: 1.3rem; font-size: 1.08rem; }
.result-actions { margin-top: 2.4rem; }

/* ── Enlace en tarjeta del Lab ─────────────────────────────────── */
.lab-link {
  margin-top: 1.1rem; align-self: flex-start; text-decoration: none;
  font-size: .86rem; font-weight: 600; color: var(--amber-ink);
  border-bottom: 1px solid currentColor; padding-bottom: .15rem;
}
.lab-link:hover { color: var(--ink); }

.legal-data { margin: 1.6rem 0; }
.legal-data > div { display: grid; gap: .2rem 1.5rem; padding: .7rem 0; border-bottom: 1px solid var(--hair); }
@media (min-width: 34rem) { .legal-data > div { grid-template-columns: 14rem 1fr; } }
.legal-data dt { font-size: .78rem; letter-spacing: .14em; text-transform: uppercase;
  font-variation-settings: "wdth" 88; color: var(--amber-ink); }
.legal-data dd { margin: 0; }
.footer-shell p a { color: var(--aqua); }