/* Neurantia · web corporativa
   Colores y tipografía según el manual de identidad v1.0 */

:root {
  --cream: #F5F2EC;
  --paper: #FBFAF7;
  --ink: #050404;
  --ink-soft: #57514C;
  --line: rgba(5, 4, 4, .12);

  --amber: #FDAF33;
  --orange: #FD8417;
  --fire: #F15710;
  --fire-ink: #C4460B; /* naranja oscurecido para texto pequeño sobre crema */
  --brand-gradient: linear-gradient(180deg, var(--amber) 0%, var(--orange) 50%, var(--fire) 100%);

  --font-display: "Varela Round", system-ui, sans-serif;
  --font-body: "Figtree", system-ui, sans-serif;

  --gutter: clamp(20px, 5vw, 72px);
  --max: 1280px;
  --ease: cubic-bezier(.2, .7, .1, 1);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -.02em;
  margin: 0;
}

h2 { font-size: clamp(2.1rem, 4.6vw, 3.6rem); }
h3 { font-size: 1.45rem; line-height: 1.15; }
p { margin: 0; }

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

.eyebrow {
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fire-ink);
  margin-bottom: 1.1rem;
}
.eyebrow--light { color: var(--amber); }

/* «ia» con el degradado del logotipo */
.ia {
  font-style: normal;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Botones y enlaces ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  padding: .95em 1.5em;
  border-radius: 999px;
  background: var(--ink);
  color: var(--cream);
  font-weight: 600;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transition: transform .4s var(--ease);
}
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--brand-gradient);
  transform: translateY(101%);
  transition: transform .5s var(--ease);
  z-index: -1;
}
.btn:hover { color: var(--ink); }
.btn:hover::before { transform: translateY(0); }
.btn__arrow { transition: transform .4s var(--ease); }
.btn:hover .btn__arrow { transform: translateX(4px); }
.btn--small { padding: .6em 1.15em; font-size: .92rem; }

.link {
  font-weight: 600;
  text-decoration: none;
  background: linear-gradient(var(--ink), var(--ink)) left bottom / 100% 1.5px no-repeat;
  padding-bottom: 2px;
  transition: background-size .4s var(--ease);
}
.link:hover { background-size: 0 1.5px; background-position: right bottom; }

/* ---------- Navegación ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px var(--gutter);
  transition: transform .5s var(--ease), background-color .3s, box-shadow .3s;
}
.nav.is-scrolled {
  background: rgba(245, 242, 236, .86);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line);
}
.nav.is-hidden { transform: translateY(-100%); }
.nav__logo img { height: 34px; width: auto; }
.nav__links { display: flex; gap: 34px; margin-left: auto; margin-right: 12px; }
.nav__links a {
  text-decoration: none;
  font-weight: 500;
  font-size: .95rem;
  position: relative;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .35s var(--ease);
}
.nav__links a:hover::after { transform: scaleX(1); transform-origin: left; }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  min-height: 100svh;
  padding: 130px var(--gutter) 70px;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 40px;
}
.hero__title {
  font-size: clamp(2.6rem, 6.4vw, 5.4rem);
  line-height: 1.02;
  margin-bottom: 1.6rem;
}
.hero__title .line { display: block; overflow: hidden; padding-bottom: .06em; }
.hero__title .line > span {
  display: inline-block;
  transform: translateY(105%);
  animation: rise 1s var(--ease) forwards;
}
.hero__title .line:nth-child(2) > span { animation-delay: .12s; color: var(--ink-soft); }
.hero__title .line:nth-child(3) > span { animation-delay: .24s; color: var(--ink-soft); }
@keyframes rise { to { transform: translateY(0); } }

.hero__lead { max-width: 33em; font-size: 1.12rem; color: var(--ink-soft); }
.hero__cta { display: flex; align-items: center; gap: 28px; margin-top: 2.2rem; flex-wrap: wrap; }

.hero__visual { position: relative; }
.flow { width: 100%; height: auto; overflow: visible; }

.flow__line {
  stroke: var(--ink);
  stroke-opacity: .28;
  stroke-width: 1.5;
  stroke-dasharray: 400;
  stroke-dashoffset: 400;
  animation: draw 1.4s var(--ease) forwards;
  animation-delay: .7s;
}
#p2 { animation-delay: .85s; }
#p3 { animation-delay: 1s; }
.flow__line--out { stroke: var(--fire); stroke-opacity: 1; stroke-width: 2; animation-delay: 1.4s; }
@keyframes draw { to { stroke-dashoffset: 0; } }

.flow__nodes circle {
  fill: var(--cream);
  stroke: var(--ink);
  stroke-width: 1.5;
  transform-box: fill-box;
  transform-origin: center;
  transform: scale(0);
  animation: pop .6s var(--ease) forwards .6s;
}
.flow__nodes circle.out { fill: var(--fire); stroke: var(--fire); animation-delay: 1.9s; }
@keyframes pop { to { transform: scale(1); } }

.flow__labels text {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  fill: var(--ink-soft);
  opacity: 0;
  animation: fade .8s ease forwards 1.2s;
}
.flow__labels text.out { fill: var(--fire-ink); font-weight: 600; animation-delay: 2s; }
@keyframes fade { to { opacity: 1; } }

.flow__packets circle { fill: var(--orange); opacity: 0; animation: fade .3s forwards 1.6s; }
.flow__packets circle.out { fill: var(--fire); }

.flow__mark {
  transform-box: fill-box;
  transform-origin: center;
  opacity: 0;
  animation: markIn 1.1s var(--ease) forwards .3s;
}
@keyframes markIn {
  from { opacity: 0; transform: scale(.86); }
  to   { opacity: 1; transform: scale(1); }
}
.flow__core { animation: breathe 3.4s ease-in-out infinite 2.4s; }
@keyframes breathe { 50% { filter: brightness(1.08) saturate(1.1); } }

/* ---------- Cinta ---------- */
.ticker {
  border-block: 1px solid var(--line);
  overflow: hidden;
  padding: 18px 0;
  background: var(--paper);
}
.ticker__track {
  display: flex;
  align-items: center;
  gap: 32px;
  width: max-content;
  animation: marquee 40s linear infinite;
}
.ticker span {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -.02em;
  font-size: 1.35rem;
  white-space: nowrap;
}
.ticker i {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--orange);
  flex: none;
}
.ticker:hover .ticker__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- Secciones ---------- */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(90px, 12vw, 150px) var(--gutter);
}
.section__head { margin-bottom: clamp(48px, 7vw, 80px); }
.section__head--split {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
}
.section__intro { max-width: 22em; color: var(--ink-soft); }

/* Servicios: lista editorial numerada */
.services { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.service {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr) minmax(0, 1.25fr) 40px;
  gap: 24px;
  align-items: baseline;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
  position: relative;
  cursor: default;
}
.service::before {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  height: 2px; width: 100%;
  background: var(--brand-gradient);
  background: linear-gradient(90deg, var(--amber), var(--orange), var(--fire));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .7s var(--ease);
}
.service:hover::before { transform: scaleX(1); }
.service__num {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.1rem;
  color: var(--fire-ink);
}
.service h3 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  transition: transform .5s var(--ease);
}
.service:hover h3 { transform: translateX(10px); }
.service p { color: var(--ink-soft); max-width: 34em; }
.service__arrow {
  font-size: 1.5rem;
  justify-self: end;
  opacity: .25;
  transition: transform .5s var(--ease), opacity .3s, color .3s;
}
.service:hover .service__arrow { opacity: 1; color: var(--fire); transform: rotate(45deg); }

/* Manifiesto con resaltado palabra a palabra */
.manifesto {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) var(--gutter);
}
.manifesto__text {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -.03em;
  font-size: clamp(1.9rem, 4.4vw, 3.6rem);
  line-height: 1.18;
  max-width: 20em;
}
.manifesto__text .w { opacity: .16; transition: opacity .25s linear; }
.manifesto__text .w.on { opacity: 1; }
.manifesto__text .w.accent.on { color: var(--fire); }

/* Ejemplos */
.cases {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}
.case {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: clamp(28px, 3.5vw, 44px);
  position: relative;
  overflow: hidden;
  transition: transform .5s var(--ease), border-color .3s;
}
.case::after {
  content: "";
  position: absolute;
  width: 14px; height: 14px;
  border-radius: 50%;
  right: 28px; top: 30px;
  background: var(--brand-gradient);
  transition: transform .6s var(--ease);
}
.case:hover { transform: translateY(-4px); border-color: rgba(5, 4, 4, .3); }
.case:hover::after { transform: scale(1.6); }
.case__tag {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 2.6rem;
}
.case h3 { margin-bottom: .8rem; max-width: 14em; }
.case p:last-child { color: var(--ink-soft); }
.case:nth-child(2) { transition-delay: .06s; }
.case:nth-child(4) { transition-delay: .06s; }

/* Proceso */
.steps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
  padding-top: 40px;
}
.steps__rail {
  position: absolute;
  top: 7px; left: 0; right: 0;
  height: 2px;
  background: var(--line);
}
.steps__rail span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--amber), var(--orange), var(--fire));
  transform-origin: left;
  transform: scaleX(var(--progress, 0));
}
.step { position: relative; }
.step__dot {
  position: absolute;
  top: -40px; left: 0;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--ink);
  transition: background-color .4s, border-color .4s;
}
.step.is-active .step__dot { background: var(--orange); border-color: var(--orange); }
.step__num { font-size: .85rem; font-weight: 600; color: var(--fire-ink); margin-bottom: .5rem; }
.step h3 { margin-bottom: .6rem; }
.step p:last-child { color: var(--ink-soft); font-size: .98rem; }

/* Contacto */
.contact {
  background: var(--ink);
  color: var(--cream);
  border-radius: 32px 32px 0 0;
  margin-top: 40px;
}
.contact__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(90px, 12vw, 160px) var(--gutter) clamp(70px, 9vw, 120px);
}
.contact__title { font-size: clamp(2.3rem, 5.6vw, 4.8rem); margin-bottom: 1.6rem; }
.contact__lead { color: rgba(245, 242, 236, .68); max-width: 30em; font-size: 1.1rem; }
.contact__mail {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  margin-top: 3rem;
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -.03em;
  font-size: clamp(1.6rem, 4.4vw, 3.2rem);
  text-decoration: none;
  border-bottom: 2px solid rgba(245, 242, 236, .25);
  padding-bottom: .15em;
  transition: border-color .4s, color .4s;
  overflow-wrap: anywhere;
}
.contact__mail:hover { color: var(--amber); border-color: var(--orange); }
.contact__mail-arrow { transition: transform .5s var(--ease); }
.contact__mail:hover .contact__mail-arrow { transform: translateX(10px); }

.footer {
  background: var(--ink);
  color: rgba(245, 242, 236, .55);
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
  padding: 30px var(--gutter) 40px;
  border-top: 1px solid rgba(245, 242, 236, .1);
  font-size: .9rem;
}
.footer img { height: 28px; width: auto; }
.footer__copy { margin-left: auto; }

/* ---------- Apariciones al hacer scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .9s var(--ease), transform .9s var(--ease);
  transition-delay: var(--d, 0s);
}
.reveal.is-in { opacity: 1; transform: none; }
.hero .reveal { opacity: 0; transform: translateY(18px); animation: heroIn .9s var(--ease) forwards; animation-delay: var(--d, .35s); transition: none; }
@keyframes heroIn { to { opacity: 1; transform: none; } }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 120px; gap: 20px; }
  .hero__visual { max-width: 560px; }
  .nav__links { display: none; }
  .service { grid-template-columns: 60px minmax(0, 1fr) 28px; }
  .service p { grid-column: 2 / 3; }
  .service__arrow { grid-row: 1; grid-column: 3; }
  .section__head--split { flex-direction: column; align-items: flex-start; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 70px; }
  .steps__rail { display: none; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav { padding-block: 14px; }
  .nav__logo img { height: 28px; }
  .flow__labels { display: none; }
  .service { grid-template-columns: 1fr 24px; gap: 10px; padding: 28px 0; }
  .service__num { grid-column: 1; }
  .service h3 { grid-column: 1; }
  .service p { grid-column: 1 / -1; }
  .service__arrow { grid-row: 1; grid-column: 2; }
  .cases { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; row-gap: 56px; }
  .contact { border-radius: 24px 24px 0 0; }
  .footer__copy { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-delay: 0s !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
  .flow__packets { display: none; }
  .ticker__track { animation: none; }
}

.nowrap { white-space: nowrap; }

/* «ia» del logotipo (SVG) dentro del texto: misma altura que las mayúsculas */
.ia-mark {
  display: inline-block;
  height: .72em;
  width: auto;
  vertical-align: baseline;
  margin-left: .02em;
}

/* En etiquetas pequeñas el «ia» se vería diminuto: lo agrandamos */
.case__tag .ia-mark,
.eyebrow .ia-mark { height: 1.2em; vertical-align: -.22em; }
/* «ia» como única etiqueta de la tarjeta: más grande */
.case__tag .ia-mark--solo { height: 1.6em; vertical-align: -.4em; }