/* ============================================================
   Cota — consultoría en IA aplicada
   Sistema visual: la regla graduada. Un motivo, tres usos:
   escala del hero, riel de fases, marca de encabezado.
   ============================================================ */

:root {
  --ground: #dce0d9;   /* salvia pálido — fondo de página */
  --chalk:  #f1f2ed;   /* tarjetas y campos */
  --ink:    #12171a;   /* texto */
  --pine:   #1b3a31;   /* secciones oscuras */
  --pine-2: #16302a;   /* variante */
  --ultra:  #1b34d8;   /* acento sobre claro */
  --ultra-l:#93a4ff;   /* acento sobre oscuro */
  --rule:   #a9b0a6;   /* graduaciones, hairlines */
  --danger: #a3241b;
  --danger-l:#ffb4ac;

  --font-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --font-prose:   "Newsreader", Georgia, "Times New Roman", serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --pad: clamp(4.5rem, 9vw, 8rem);
  --ease: cubic-bezier(.2, .7, .2, 1);
}

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

html { scroll-behavior: smooth; }

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.02;
  margin: 0;
  text-wrap: balance;
}

h2 { font-size: clamp(2rem, 4.4vw, 3.15rem); }
h3 { font-size: 1.28rem; letter-spacing: -0.02em; line-height: 1.15; }

p { margin: 0; }
a { color: inherit; }

::selection { background: var(--ultra); color: #fff; }

.wrap { width: min(1180px, 100% - 2.5rem); margin-inline: auto; }

.skip {
  position: absolute; left: -999px; top: 0; z-index: 99;
  background: var(--ink); color: var(--ground);
  padding: .75rem 1.25rem; font-family: var(--font-mono); font-size: .8rem;
}
.skip:focus { left: 0; }

:where(a, button, input, select, textarea):focus-visible {
  outline: 2px solid var(--ultra);
  outline-offset: 3px;
  border-radius: 2px;
}
.section--dark :where(a, button, input, select, textarea):focus-visible {
  outline-color: var(--ultra-l);
}

/* ── Navegación ───────────────────────────────────────────── */

.nav {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--ground) 82%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.nav.is-stuck { border-bottom-color: color-mix(in srgb, var(--rule) 60%, transparent); }

.nav__inner {
  display: flex; align-items: center; gap: 2rem;
  min-height: 68px;
}

.brand {
  display: flex; align-items: center; gap: .6rem;
  text-decoration: none; margin-right: auto;
}
.brand__mark {
  width: 22px; height: 22px; flex: none;
  background:
    linear-gradient(var(--ink) 0 0) 0 50% / 100% 1px no-repeat,
    repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 5px) 0 0 / 100% 8px no-repeat;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 800; font-size: 1.32rem; letter-spacing: -0.045em;
}

.nav__links { display: flex; gap: 1.75rem; }
.nav__links a {
  font-family: var(--font-mono); font-size: .78rem;
  text-decoration: none; letter-spacing: .01em;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.nav__links a:hover { border-bottom-color: var(--ultra); color: var(--ultra); }

@media (max-width: 720px) { .nav__links { display: none; } }

/* ── Botones ──────────────────────────────────────────────── */

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 600; font-size: .95rem;
  letter-spacing: -0.01em;
  padding: .85rem 1.5rem;
  background: var(--ink); color: var(--ground);
  border: 1px solid var(--ink); border-radius: 999px;
  text-decoration: none; cursor: pointer;
  transition: background .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.btn:hover { background: var(--ultra); border-color: var(--ultra); color: #fff; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--sm { padding: .5rem 1.05rem; font-size: .84rem; }
.btn--wide { padding-inline: 2.25rem; }

.btn--ghost { background: transparent; color: var(--ink); border-color: color-mix(in srgb, var(--ink) 30%, transparent); }
.btn--ghost:hover { background: transparent; color: var(--ultra); border-color: var(--ultra); }

.section--dark .btn {
  background: var(--ground); color: var(--pine); border-color: var(--ground);
}
.section--dark .btn:hover { background: var(--ultra-l); border-color: var(--ultra-l); color: var(--pine); }

/* ── Secciones y encabezados ──────────────────────────────── */

.section { padding-block: var(--pad); position: relative; }
.section--dark { background: var(--pine); color: var(--ground); }
.section--dark .lead { color: color-mix(in srgb, var(--ground) 78%, transparent); }

.eyebrow {
  display: flex; align-items: center; gap: .7rem;
  font-family: var(--font-mono); font-size: .73rem;
  text-transform: uppercase; letter-spacing: .17em;
  color: color-mix(in srgb, var(--ink) 60%, transparent);
  margin-bottom: 1.5rem;
}
.section--dark .eyebrow { color: color-mix(in srgb, var(--ground) 62%, transparent); }

/* Marca de encabezado: el tercer uso de la regla graduada. */
.mark {
  width: 40px; height: 9px; flex: none;
  background:
    linear-gradient(currentColor 0 0) 0 100% / 100% 1px no-repeat,
    repeating-linear-gradient(90deg, currentColor 0 1px, transparent 1px 5px) 0 0 / 100% 5px no-repeat;
  opacity: .85;
}

.head { max-width: 46rem; margin-bottom: 3.5rem; }
.head--flush { margin-bottom: 0; }

.lead {
  font-family: var(--font-prose);
  font-size: clamp(1.1rem, 1.5vw, 1.32rem);
  font-weight: 300;
  line-height: 1.55;
  color: color-mix(in srgb, var(--ink) 78%, transparent);
  margin-top: 1.4rem;
}
.lead--narrow { max-width: 38rem; }

/* ── Hero ─────────────────────────────────────────────────── */

.section--hero { padding-top: clamp(3.5rem, 7vw, 6rem); padding-bottom: clamp(3rem, 6vw, 5rem); }

.hero__title {
  font-size: clamp(2.7rem, 7.6vw, 5.6rem);
  line-height: .97;
  letter-spacing: -0.045em;
  max-width: 16ch;
}
.hero__title em {
  font-family: var(--font-prose);
  font-style: italic; font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--ultra);
}

.hero__body {
  display: grid; grid-template-columns: minmax(22rem, 34rem) minmax(0, 1fr);
  gap: 2.5rem 3rem; align-items: end;
  margin-top: 2.5rem;
}
.hero__body .lead { max-width: none; margin-top: 0; }

.hero__actions { display: flex; gap: .75rem; flex-wrap: wrap; justify-content: flex-end; }

@media (max-width: 1080px) {
  .hero__body { grid-template-columns: 1fr; align-items: start; gap: 2rem; }
  .hero__body .lead { max-width: 40rem; }
  .hero__actions { justify-content: flex-start; }
}

/* ── Firma: la regla graduada ─────────────────────────────── */

.scale { margin-top: clamp(3.5rem, 8vw, 6rem); }

.scale__track {
  position: relative; height: 26px;
  border-top: 1px solid color-mix(in srgb, var(--ink) 35%, transparent);
}
.scale__ticks {
  position: absolute; inset: 0 0 auto 0; height: 10px;
  background: repeating-linear-gradient(90deg,
    color-mix(in srgb, var(--ink) 32%, transparent) 0 1px, transparent 1px 14px);
}
.scale__fill {
  position: absolute; top: -1px; left: 0; height: 3px;
  width: var(--to, 78%);
  background: var(--ultra);
  transform-origin: left;
}
.scale__marker {
  position: absolute; top: -1px; left: var(--at);
  transform: translateX(-50%);
}
.scale__dot {
  display: block; width: 13px; height: 13px; margin-top: -6px;
  border-radius: 50%;
  background: var(--ultra);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--ultra) 16%, transparent);
}

.scale__legend {
  list-style: none; margin: 0; padding: 0;
  position: relative; height: 3.5rem;
}
.scale__legend li {
  position: absolute; top: .5rem; left: var(--at);
  display: flex; flex-direction: column; gap: .15rem;
  white-space: nowrap;
}
.scale__legend li:last-child { left: auto; right: 0; text-align: right; align-items: flex-end; }
.scale__legend b {
  font-family: var(--font-display); font-weight: 600; font-size: .95rem;
  letter-spacing: -0.02em;
}
.scale__legend span {
  font-family: var(--font-mono); font-size: .7rem;
  color: color-mix(in srgb, var(--ink) 55%, transparent);
}
.scale__legend li:last-child b { color: var(--ultra); }

@media (max-width: 700px) {
  .section--hero { padding-bottom: 1.5rem; }
  .scale { margin-top: 2.75rem; }
  .scale__legend { height: auto; display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; padding-top: .9rem; }
  .scale__legend li { position: static; }
  .scale__legend li:last-child { text-align: left; align-items: flex-start; }
}

/* Animación de entrada de la regla */
@media (prefers-reduced-motion: no-preference) {
  .scale .scale__fill { width: 0; transition: width 1.5s var(--ease) .35s; }
  .scale .scale__marker { left: 0; transition: left 1.5s var(--ease) .35s; }
  .scale.is-in .scale__fill { width: 78%; }
  .scale.is-in .scale__marker { left: 78%; }
}

/* ── Tarjetas de servicio ─────────────────────────────────── */

.cards {
  display: grid; gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.card {
  background: var(--chalk);
  border: 1px solid color-mix(in srgb, var(--rule) 55%, transparent);
  border-radius: 4px;
  padding: 2rem 1.75rem 2.25rem;
  display: flex; flex-direction: column;
  position: relative; overflow: hidden;
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--ultra);
  transform: scaleX(.12); transform-origin: left;
  transition: transform .45s var(--ease);
}
.card:hover { border-color: color-mix(in srgb, var(--ultra) 45%, transparent); transform: translateY(-3px); }
.card:hover::before { transform: scaleX(1); }

.card__kicker {
  font-family: var(--font-mono); font-size: .72rem;
  text-transform: uppercase; letter-spacing: .16em;
  color: var(--ultra);
  margin-bottom: 1.1rem;
}
.card h3 { margin-bottom: .85rem; }
.card > p {
  color: color-mix(in srgb, var(--ink) 75%, transparent);
  font-weight: 300;
}

.list {
  list-style: none; margin: 1.5rem 0 0; padding: 0;
  border-top: 1px solid color-mix(in srgb, var(--rule) 60%, transparent);
}
.list li {
  font-family: var(--font-display); font-size: .93rem; font-weight: 400;
  line-height: 1.4;
  padding: .8rem 0 .8rem 1.4rem;
  border-bottom: 1px solid color-mix(in srgb, var(--rule) 40%, transparent);
  position: relative;
}
.list li::before {
  content: ""; position: absolute; left: 0; top: 1.25rem;
  width: 7px; height: 1px; background: var(--ultra);
}
.list li:last-child { border-bottom: 0; padding-bottom: 0; }

/* ── Fases: la regla, en vertical ─────────────────────────── */

.phases {
  list-style: none; margin: 0; padding: 0;
  border-top: 1px solid color-mix(in srgb, var(--ground) 25%, transparent);
}

.phase {
  display: grid; grid-template-columns: 5rem minmax(0, 1fr);
  gap: 2rem;
  padding: 2.25rem 0 2.25rem 1.9rem;
  border-bottom: 1px solid color-mix(in srgb, var(--ground) 25%, transparent);
  position: relative;
}
.phase::before {
  content: ""; position: absolute; left: 0; top: -1px; height: 1px; width: 0;
  background: var(--ultra-l);
  transition: width .6s var(--ease);
}
.phase:hover::before { width: 100%; }

/* Riel graduado: la regla del hero, girada en vertical. */
.phase::after {
  content: ""; position: absolute; left: 0; top: 2.6rem; bottom: 2.25rem; width: 9px;
  background: repeating-linear-gradient(180deg, var(--ground) 0 1px, transparent 1px 7px);
  opacity: .32;
  transition: opacity .4s var(--ease), background .4s var(--ease);
}
.phase:hover::after {
  opacity: 1;
  background: repeating-linear-gradient(180deg, var(--ultra-l) 0 1px, transparent 1px 7px);
}

.phase__num {
  font-family: var(--font-mono); font-size: .82rem;
  color: var(--ultra-l);
  letter-spacing: .1em;
  padding-top: .35rem;
}
.phase__body { max-width: 44rem; }
.phase__body h3 { font-size: clamp(1.5rem, 2.6vw, 2rem); }
.phase__time {
  font-family: var(--font-mono); font-size: .74rem;
  text-transform: uppercase; letter-spacing: .14em;
  color: color-mix(in srgb, var(--ground) 55%, transparent);
  margin: .6rem 0 1rem;
}
.phase__body > p:last-child {
  font-weight: 300;
  color: color-mix(in srgb, var(--ground) 80%, transparent);
}

@media (max-width: 620px) {
  .phase { grid-template-columns: 1fr; gap: .35rem; padding-left: 1.5rem; }
  .phase__num { padding-top: 0; }
  .phase::after { top: 2.5rem; }
}

/* ── Capacidades ──────────────────────────────────────────── */

.split {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: start;
}
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }

.chips {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: .5rem;
}
.chips li {
  font-family: var(--font-mono); font-size: .8rem;
  padding: .5rem .9rem;
  border: 1px solid color-mix(in srgb, var(--rule) 70%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--chalk) 60%, transparent);
}

/* ── Contacto ─────────────────────────────────────────────── */

.section--contact { background: var(--pine-2); }

.contact {
  display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 6vw, 5.5rem);
  align-items: start;
}
@media (max-width: 900px) { .contact { grid-template-columns: 1fr; } }

.contact__meta {
  margin: 3rem 0 0; padding: 0;
  border-top: 1px solid color-mix(in srgb, var(--ground) 22%, transparent);
}
.contact__meta > div {
  display: flex; gap: 1rem; align-items: baseline;
  padding: .85rem 0;
  border-bottom: 1px solid color-mix(in srgb, var(--ground) 15%, transparent);
}
.contact__meta dt {
  font-family: var(--font-mono); font-size: .72rem;
  text-transform: uppercase; letter-spacing: .14em;
  color: color-mix(in srgb, var(--ground) 55%, transparent);
  width: 6rem; flex: none;
}
.contact__meta dd {
  margin: 0; font-family: var(--font-display); font-size: .98rem;
}
.contact__meta a { text-decoration: none; border-bottom: 1px solid var(--ultra-l); }
.contact__meta a:hover { color: var(--ultra-l); }

/* ── Formulario ───────────────────────────────────────────── */

.form {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1.15rem 1rem;
}
.field { display: flex; flex-direction: column; grid-column: 1 / -1; }
.field--half { grid-column: span 1; }
@media (max-width: 520px) { .field--half { grid-column: 1 / -1; } }

.field label {
  font-family: var(--font-mono); font-size: .73rem;
  text-transform: uppercase; letter-spacing: .13em;
  color: color-mix(in srgb, var(--ground) 68%, transparent);
  margin-bottom: .5rem;
}
.field .opt { text-transform: none; letter-spacing: 0; opacity: .7; }

.field input,
.field select,
.field textarea {
  font-family: var(--font-display); font-size: 1rem; color: var(--ground);
  background: color-mix(in srgb, var(--ground) 7%, transparent);
  border: 1px solid color-mix(in srgb, var(--ground) 26%, transparent);
  border-radius: 3px;
  padding: .8rem .9rem;
  width: 100%;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.field textarea { resize: vertical; line-height: 1.5; min-height: 7rem; }
.field select { appearance: none; cursor: pointer;
  background-image: linear-gradient(45deg, transparent 50%, var(--ground) 50%),
                    linear-gradient(135deg, var(--ground) 50%, transparent 50%);
  background-position: calc(100% - 20px) 55%, calc(100% - 14px) 55%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}
.field select option { background: var(--pine); color: var(--ground); }

.field input::placeholder,
.field textarea::placeholder { color: color-mix(in srgb, var(--ground) 40%, transparent); }

.field input:hover,
.field select:hover,
.field textarea:hover { border-color: color-mix(in srgb, var(--ground) 45%, transparent); }

.field input:focus,
.field select:focus,
.field textarea:focus {
  background: color-mix(in srgb, var(--ground) 11%, transparent);
  border-color: var(--ultra-l);
}

.field__hint {
  font-family: var(--font-mono); font-size: .72rem;
  color: color-mix(in srgb, var(--ground) 48%, transparent);
  margin-top: .45rem;
}
.field__error {
  font-family: var(--font-mono); font-size: .73rem;
  color: var(--danger-l);
  margin-top: .45rem;
  display: none;
}
.field.is-invalid .field__error { display: block; }
.field.is-invalid input,
.field.is-invalid select,
.field.is-invalid textarea { border-color: var(--danger-l); }

.field--check {
  display: grid; grid-template-columns: auto 1fr; gap: .1rem .7rem;
  align-items: start; margin-top: .4rem;
}
.field--check input {
  width: 18px; height: 18px; margin-top: .15rem; padding: 0;
  accent-color: var(--ultra-l); cursor: pointer;
}
.field--check label {
  font-family: var(--font-prose); font-size: .95rem; font-weight: 300;
  text-transform: none; letter-spacing: 0; line-height: 1.45;
  color: color-mix(in srgb, var(--ground) 80%, transparent);
  margin: 0; cursor: pointer;
}
.field--check .field__error { grid-column: 2; }

.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form__foot {
  grid-column: 1 / -1;
  display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap;
  margin-top: .85rem;
}
.form__status {
  font-family: var(--font-mono); font-size: .78rem; line-height: 1.5;
  color: var(--ultra-l);
}
.form__status.is-error { color: var(--danger-l); }

.form.is-sending .btn { opacity: .6; pointer-events: none; }

/* ── Pie ──────────────────────────────────────────────────── */

.footer { background: var(--pine-2); color: var(--ground); padding-bottom: 3rem; }
.footer__inner {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding-top: 2rem;
  border-top: 1px solid color-mix(in srgb, var(--ground) 18%, transparent);
}
.footer__brand { font-family: var(--font-display); font-weight: 600; font-size: .95rem; }
.footer__legal {
  font-family: var(--font-mono); font-size: .74rem;
  color: color-mix(in srgb, var(--ground) 55%, transparent);
}

/* ── Revelado al hacer scroll ─────────────────────────────── */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity .7s var(--ease), transform .7s var(--ease);
    transition-delay: calc(var(--d, 0) * 90ms);
  }
  .reveal.is-in { opacity: 1; transform: none; }
}