/* EcoNode · sistema de diseño "C · Red" */
:root {
  --ink: #24292B;
  --grey: #646B6E;
  --green: #6AA84F;
  --green-text: #3F7A2E;
  --green-soft: #F1F6EE;
  --green-light: #8CC66F;
  --line: #DDE2E3;
  --white: #FFFFFF;
  --amber: #C98A12;

  --font: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --logo: "Montserrat", var(--font);

  --radius: 10px;
  --wrap: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: var(--green-text); }
h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; font-weight: 700; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.2rem, 5.5vw, 3.8rem); font-weight: 800; letter-spacing: -0.025em; }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.5rem); letter-spacing: -0.02em; }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }
strong { font-weight: 700; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }
.wrap--narrow { max-width: 820px; }

.eyebrow {
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--green-text);
  letter-spacing: .02em;
  margin-bottom: .9rem;
}
.eyebrow--light { color: var(--green-light); }

/* ---------- logo ---------- */
.logo { font-family: var(--logo); font-size: 1.45rem; text-decoration: none; line-height: 1; white-space: nowrap; }
.logo__eco { color: var(--green); font-weight: 800; }
.logo__node { color: var(--grey); font-weight: 400; }
.logo--small { font-size: 1.2rem; }

/* ---------- botones ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4em;
  font: 600 1rem/1 var(--font);
  padding: .95em 1.4em;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.btn--sm { font-size: .9rem; padding: .7em 1.1em; }
.btn--primary { background: var(--green); color: var(--white); }
.btn--primary:hover { background: var(--green-text); }
.btn--primary:disabled { opacity: .6; cursor: wait; }
.btn--ghost { color: var(--white); border-color: rgba(255,255,255,.35); }
.btn--ghost:hover { border-color: var(--white); }
.btn--line { background: var(--white); color: var(--ink); border-color: var(--line); }
.btn--line:hover { border-color: var(--grey); }
.btn:focus-visible, .lang:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible {
  outline: 2px solid var(--green); outline-offset: 2px;
}

/* ---------- topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar__inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.nav { display: none; gap: 24px; margin-left: 16px; }
.nav a { color: var(--grey); text-decoration: none; font-weight: 500; font-size: .95rem; }
.nav a:hover { color: var(--ink); }
@media (min-width: 900px) { .nav { display: flex; } }
.topbar__actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.lang {
  font: 500 .8rem var(--mono); color: var(--grey);
  background: none; border: 1px solid var(--line); border-radius: 999px;
  padding: .5em .8em; cursor: pointer;
}
.lang:hover { color: var(--ink); border-color: var(--grey); }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; background: var(--ink); color: var(--white); padding: 88px 0 80px; }
.hero__net { position: absolute; right: -40px; top: 10px; width: min(560px, 70vw); color: #9AA3A6; pointer-events: none; }
.hero__inner { position: relative; }
.hero h1 { max-width: 14ch; }
.hero__lead { font-size: clamp(1.05rem, 2vw, 1.25rem); color: #D4D9DA; max-width: 46ch; margin: 1.2rem 0 2rem; }
.hero__lead strong { color: var(--white); }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; }
.hero__badge { display: flex; align-items: flex-start; gap: 10px; margin: 2.6rem 0 0; font-size: .9rem; color: #B9C0C2; max-width: 60ch; }
.hero__badge .dot { flex: none; width: 9px; height: 9px; border-radius: 50%; background: var(--green-light); margin-top: .5em; }

/* ---------- secciones ---------- */
.section { padding: 88px 0; border-bottom: 1px solid var(--line); }
.section--soft { background: var(--green-soft); }
.section--dark { background: var(--ink); color: var(--white); border-bottom: 0; }
.section__lead { color: var(--grey); max-width: 62ch; font-size: 1.08rem; }

/* problema */
.problem { display: grid; gap: 40px; margin-top: 1.5rem; }
@media (min-width: 900px) { .problem { grid-template-columns: 1.15fr 1fr; gap: 64px; } }
.big { font-size: clamp(1.2rem, 2.2vw, 1.45rem); line-height: 1.5; }
.problem__text p:not(.big) { color: var(--grey); }
.problem__text strong { color: var(--ink); }
.facts { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.facts li { display: flex; gap: 18px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.facts__k {
  flex: none; width: 52px; height: 52px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--green-soft); color: var(--green-text);
  font: 500 .95rem var(--mono);
}
.facts h3 { margin-bottom: .25em; }
.facts p { color: var(--grey); margin: 0; font-size: .97rem; }

/* simulación */
.sim { display: grid; gap: 20px; margin-top: 2rem; }
@media (min-width: 900px) {
  .sim { grid-template-columns: 1fr 1fr; }
  .sim__card figcaption { min-height: 84px; }
}
.sim__card { margin: 0; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.sim__card--eco { border-color: var(--green); }
.sim__card figcaption { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.sim__desc { font-size: .92rem; color: var(--grey); }
.sim__card canvas { width: 100%; height: auto; aspect-ratio: 3 / 2; background: #E9EEE6; }
.tag { font: 500 .78rem var(--mono); padding: .35em .75em; border-radius: 999px; }
.tag--grey { background: #EEF0F0; color: var(--ink); }
.tag--green { background: var(--green); color: var(--white); }
.sim__stats { display: grid; grid-template-columns: 1fr 1fr; margin: 0; border-top: 1px solid var(--line); }
.sim__stats div { padding: 12px 16px; }
.sim__stats div + div { border-left: 1px solid var(--line); }
.sim__stats dt { font-size: .8rem; color: var(--grey); }
.sim__stats dd { margin: 0; font-weight: 800; font-size: 1.6rem; font-variant-numeric: tabular-nums; }
.sim__card--eco .sim__stats dd { color: var(--green-text); }
.sim__bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; margin-top: 20px; }
.sim__result { margin: 0; font-size: 1.1rem; }
.sim__result strong { color: var(--green-text); font-size: 1.4rem; font-weight: 800; }
.sim__controls { display: flex; align-items: center; gap: 8px; }
.sim__clock { font: 500 .9rem var(--mono); color: var(--grey); margin-right: 6px; font-variant-numeric: tabular-nums; }
.note { font-size: .82rem; color: var(--grey); margin-top: 14px; }

/* pasos */
.steps { list-style: none; padding: 0; margin: 2rem 0 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
@media (min-width: 900px) { .steps { grid-template-columns: repeat(3, 1fr); border-top: 0; } }
.steps li { padding: 28px 0; border-bottom: 1px solid var(--line); }
@media (min-width: 900px) {
  .steps li { padding: 28px 28px 8px; border-bottom: 0; border-left: 1px solid var(--line); }
  .steps li:first-child { padding-left: 0; border-left: 0; }
}
.steps__n { display: block; font: 500 .85rem var(--mono); color: var(--green-text); margin-bottom: 14px; }
.steps p { color: var(--grey); }

/* resultados */
.results { margin-top: 56px; padding: 32px; border: 1px solid var(--line); border-radius: var(--radius); display: grid; gap: 24px; }
@media (min-width: 900px) { .results { grid-template-columns: 1.1fr 1fr; align-items: center; padding: 40px; } }
.results__head p:not(.eyebrow) { color: var(--grey); margin: 0; }
.results__nums { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.results__nums div { display: flex; flex-direction: column; gap: 4px; font-size: .92rem; color: var(--grey); }
.num { font-size: clamp(2.2rem, 5vw, 3rem); font-weight: 800; color: var(--green-text); letter-spacing: -0.03em; line-height: 1; }
.results .note { grid-column: 1 / -1; margin: 0; }

/* ventajas */
.grid4 { display: grid; gap: 16px; margin-top: 2rem; }
@media (min-width: 640px) { .grid4 { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1000px) { .grid4 { grid-template-columns: repeat(4, 1fr); } }
.card { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3::before { content: ""; display: block; width: 10px; height: 10px; border-radius: 50%; background: var(--green); margin-bottom: 16px; }
.card p { color: var(--grey); margin: 0; font-size: .97rem; }

/* piloto */
.pilot { display: grid; gap: 40px; align-items: center; }
@media (min-width: 900px) { .pilot { grid-template-columns: 1.3fr 1fr; gap: 72px; } }
.pilot p { color: #D4D9DA; font-size: 1.08rem; max-width: 52ch; }
.pilot__award { display: flex; gap: 18px; align-items: flex-start; padding: 24px; border: 1px solid rgba(255,255,255,.18); border-radius: var(--radius); }
.pilot__award p { margin: 0; font-size: .97rem; }
.pilot__award strong { color: var(--white); }
.pilot__medal {
  flex: none; width: 56px; height: 56px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--green-light); color: var(--ink); font-weight: 800; font-size: 1.1rem;
}

/* faq */
details { border-bottom: 1px solid var(--line); }
details:first-of-type { border-top: 1px solid var(--line); margin-top: 1.5rem; }
summary { cursor: pointer; list-style: none; padding: 20px 40px 20px 0; font-weight: 600; font-size: 1.05rem; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%); font: 400 1.4rem var(--mono); color: var(--green-text); }
details[open] summary::after { content: "−"; }
details p { color: var(--grey); padding-right: 40px; }

/* demo */
.demo { display: grid; gap: 40px; }
@media (min-width: 900px) { .demo { grid-template-columns: 1fr 1.1fr; gap: 72px; } }
.demo__text p:not(.eyebrow) { color: var(--grey); font-size: 1.08rem; }
.form { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; display: grid; gap: 16px; }
.field { display: grid; gap: 6px; font-size: .9rem; font-weight: 600; }
.field input, .field select {
  font: 400 1rem var(--font); color: var(--ink);
  padding: .8em .9em; border: 1px solid var(--line); border-radius: 8px; background: var(--white);
  width: 100%;
}
.field input:focus, .field select:focus { border-color: var(--green); outline: none; }
.field input[aria-invalid="true"], .field select[aria-invalid="true"] { border-color: #B54134; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: .9rem; color: var(--grey); }
.check input { margin-top: .3em; accent-color: var(--green); width: 16px; height: 16px; flex: none; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form .btn { justify-self: start; }
.form__msg { margin: 0; font-size: .95rem; min-height: 1.5em; }
.form__msg.ok { color: var(--green-text); font-weight: 600; }
.form__msg.err { color: #B54134; }

/* footer */
.footer { padding: 40px 0; }
.footer__inner { display: flex; flex-wrap: wrap; gap: 12px 32px; align-items: center; color: var(--grey); font-size: .9rem; }
.footer__inner p { margin: 0; }
.footer__inner p:last-child { margin-left: auto; }
.footer a { color: var(--grey); }

@media (max-width: 359px) { .topbar__actions .btn { display: none; } }
@media (max-width: 520px) {
  .hero { padding: 64px 0 56px; }
  .section { padding: 64px 0; }
  .form { padding: 20px; }
  .footer__inner p:last-child { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }