/* SFI-America — sfi-america.com
   Composición editorial: rejilla asimétrica de dos columnas, ritmo vertical amplio.
   Toda la paleta está en variables. Cambiar de marca son seis líneas. */

:root {
  --ink:        #0E1A26;
  --ink-soft:   #3C4E5E;
  --ink-mute:   #74838F;
  --rule:       #E2DED6;
  --rule-soft:  #EDEAE4;
  --bg:         #FBFAF8;
  --bg-alt:     #F4F1EB;
  --accent:     #1D4E6B;
  --accent-ink: #FFFFFF;

  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:  Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  --gutter: 1.75rem;
  --max: 74rem;
  --measure: 32rem;

  --s-1: .5rem;
  --s-2: 1rem;
  --s-3: 1.5rem;
  --s-4: 2.25rem;
  --s-5: 3.5rem;
  --s-6: 5rem;
  --s-7: 7.5rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink:        #EFEBE4;
    --ink-soft:   #BCC6CF;
    --ink-mute:   #8494A1;
    --rule:       #24333F;
    --rule-soft:  #1A2731;
    --bg:         #0C1319;
    --bg-alt:     #111B23;
    --accent:     #8FC0D9;
    --accent-ink: #0C1319;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --ink:        #EFEBE4;
  --ink-soft:   #BCC6CF;
  --ink-mute:   #8494A1;
  --rule:       #24333F;
  --rule-soft:  #1A2731;
  --bg:         #0C1319;
  --bg-alt:     #111B23;
  --accent:     #8FC0D9;
  --accent-ink: #0C1319;
  color-scheme: dark;
}

*, *::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(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  font-kerning: normal;
}

/* ============ estructura ============ */

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.band { border-top: 1px solid var(--rule); }
.band-alt { background: var(--bg-alt); border-top: 1px solid var(--rule); }

.section { padding-block: var(--s-7); }
.section-tight { padding-block: var(--s-6); }

/* Rejilla editorial: etiqueta a la izquierda, contenido a la derecha. */
.grid {
  display: grid;
  grid-template-columns: 12rem minmax(0, 1fr);
  gap: var(--s-5);
  align-items: start;
}

@media (max-width: 62rem) {
  .grid { grid-template-columns: 1fr; gap: var(--s-3); }
}

.label {
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin: .55rem 0 0;
  line-height: 1.5;
}

@media (max-width: 62rem) { .label { margin-top: 0; } }

/* ============ tipografía ============ */

h1, h2, h3 { margin: 0; font-weight: 400; }

h1 {
  font-family: var(--serif);
  font-size: clamp(3rem, 8.5vw, 5.75rem);
  line-height: .96;
  letter-spacing: -0.022em;
}

h2 {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 3.6vw, 2.5rem);
  line-height: 1.14;
  letter-spacing: -0.014em;
  text-wrap: balance;
  max-width: 26ch;
}

h3 {
  font-family: var(--sans);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.002em;
}

p { margin: 0; max-width: var(--measure); }
.lede { font-size: 1.1875rem; line-height: 1.65; color: var(--ink-soft); max-width: 38rem; }
.muted { color: var(--ink-soft); }
.small { font-size: .9375rem; line-height: 1.6; }

a { color: inherit; text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 1px; }

/* ============ cabecera ============ */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-2);
  padding-block: 1.6rem;
}

.wordmark { display: inline-block; line-height: 0; }
.wordmark svg.logo { height: 21px; width: auto; display: block; }
.wordmark:hover { opacity: .75; }

.nav { display: flex; gap: 1.75rem; font-size: .875rem; color: var(--ink-soft); }
.nav a { text-decoration: none; }
.nav a:hover { color: var(--ink); }
@media (max-width: 46rem) { .nav .nav-hide { display: none; } }

/* ============ hero ============ */

.hero { position: relative; padding-block: var(--s-6) var(--s-7); overflow: hidden; }

.hero-inner { position: relative; z-index: 1; }

.hero h1 { margin-bottom: var(--s-4); max-width: 16ch; }

.hero .claim {
  font-family: var(--serif);
  font-size: clamp(1.375rem, 2.6vw, 1.75rem);
  line-height: 1.35;
  max-width: 24ch;
  margin-bottom: var(--s-3);
}

.hero .lede { margin-bottom: var(--s-4); }

/* marca de agua construida con el símbolo */
.hero-mark {
  position: absolute;
  right: -4%;
  top: 50%;
  transform: translateY(-50%);
  width: min(36vw, 26rem);
  color: var(--ink);
  opacity: .05;
  pointer-events: none;
  z-index: 0;
}

@media (max-width: 62rem) { .hero-mark { display: none; } }

/* ============ botón ============ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: .9375rem;
  font-weight: 500;
  padding: .95rem 1.6rem;
  border-radius: 2px;
  text-decoration: none;
  transition: transform .15s ease, opacity .15s ease;
}
.btn:hover { opacity: .9; transform: translateY(-1px); }
.btn .arrow { transition: transform .15s ease; }
.btn:hover .arrow { transform: translateX(3px); }

.btn-ghost {
  background: none;
  color: var(--ink);
  padding: 0;
  border-radius: 0;
  border-bottom: 1px solid var(--rule);
  padding-bottom: .3rem;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: none; }

/* ============ cifras ============ */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10.5rem, 1fr));
  gap: var(--s-4) var(--s-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.stats li { border-top: 1px solid var(--rule); padding-top: var(--s-2); }

.stats .fig {
  display: block;
  font-family: var(--serif);
  font-size: clamp(2rem, 3.6vw, 2.75rem);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: .55rem;
  font-variant-numeric: tabular-nums;
}

.stats .cap { display: block; font-size: .8125rem; line-height: 1.55; color: var(--ink-mute); max-width: 14rem; }

/* ============ columnas de texto ============ */

.cols {
  display: grid;
  gap: var(--s-4) var(--s-5);
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  margin-top: var(--s-4);
}

.cols > div { max-width: 24rem; }
.cols h3 { margin-bottom: .5rem; }
.cols p { font-size: 1rem; color: var(--ink-soft); }

.numbered { counter-reset: n; }
.numbered > div { position: relative; padding-top: var(--s-3); border-top: 2px solid var(--ink); }
.numbered > div::before {
  counter-increment: n;
  content: counter(n, decimal-leading-zero);
  font-family: var(--serif);
  font-size: .875rem;
  color: var(--ink-mute);
  display: block;
  margin-bottom: .6rem;
}

/* ============ casos ============ */

.cases { display: grid; gap: 0; margin-top: var(--s-3); }

.case {
  display: grid;
  grid-template-columns: 12rem minmax(0, 1fr);
  gap: var(--s-5);
  padding-block: var(--s-5);
  border-top: 1px solid var(--rule);
}

.case:last-child { border-bottom: 1px solid var(--rule); }

@media (max-width: 62rem) {
  .case { grid-template-columns: 1fr; gap: var(--s-2); padding-block: var(--s-4); }
}

.case .era {
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  line-height: 1.6;
  margin: .4rem 0 0;
}

.case h3 {
  font-family: var(--serif);
  font-size: clamp(1.3rem, 2.4vw, 1.6rem);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: -0.012em;
  margin-bottom: var(--s-2);
  max-width: 24ch;
}

.case .edge {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  max-width: 36rem;
  margin-bottom: var(--s-3);
}

.case .facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .55rem;
  font-size: .9375rem;
  line-height: 1.55;
  color: var(--ink-mute);
  max-width: 40rem;
}

.case .facts li { padding-left: 1.1rem; position: relative; }
.case .facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: .45rem;
  height: 1px;
  background: var(--ink-mute);
}

/* ============ preguntas ============ */

.questions { list-style: none; margin: var(--s-3) 0 0; padding: 0; max-width: 46rem; }

.questions li { border-top: 1px solid var(--rule); }
.questions li:last-child { border-bottom: 1px solid var(--rule); }

.questions a, .questions span {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s-2);
  padding: 1.15rem 0;
  font-family: var(--serif);
  font-size: clamp(1.0625rem, 1.9vw, 1.3rem);
  line-height: 1.35;
  text-decoration: none;
  transition: color .15s ease, padding-left .15s ease;
}

.questions a:hover { color: var(--accent); padding-left: .4rem; }
.questions a::after { content: "→"; font-family: var(--sans); font-size: .9rem; color: var(--ink-mute); flex: none; }
.questions a:hover::after { color: var(--accent); }
.questions span { color: var(--ink-mute); }
.questions span::after { content: "pronto"; font-family: var(--sans); font-size: .6875rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-mute); flex: none; }
html[lang="en"] .questions span::after { content: "soon"; }

/* ============ herramientas ============ */

.tools {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .5rem;
  margin: 0 0 var(--s-3);
  padding: 0;
  list-style: none;
}

.tools li {
  font-size: .8125rem;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: .35rem .7rem;
  line-height: 1.4;
}

/* ============ cierre ============ */

.closing { background: var(--accent); color: var(--accent-ink); }
.closing .section { padding-block: var(--s-6); }
.closing h2 { max-width: 18ch; }
.closing .label { color: color-mix(in srgb, var(--accent-ink) 62%, transparent); }
.closing p { color: color-mix(in srgb, var(--accent-ink) 82%, transparent); }
.closing .btn { background: var(--accent-ink); color: var(--accent); }

/* ============ pie ============ */

footer { border-top: 1px solid var(--rule); padding-block: var(--s-5) var(--s-6); }

.foot-grid {
  display: grid;
  grid-template-columns: 12rem minmax(0, 1fr);
  gap: var(--s-5);
  align-items: start;
}
@media (max-width: 62rem) { .foot-grid { grid-template-columns: 1fr; gap: var(--s-3); } }

footer .logo-footer { height: 44px; width: auto; display: block; }
footer p { font-size: .875rem; color: var(--ink-mute); margin-bottom: .4rem; }
footer a { text-decoration: none; color: var(--ink-soft); }
footer a:hover { text-decoration: underline; }

/* ============ artículo ============ */

.article { padding-block: var(--s-5) var(--s-7); }

.article-head { max-width: 40rem; margin-bottom: var(--s-5); }

.backlink {
  display: inline-block;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--ink-mute);
  text-decoration: none;
  margin-bottom: var(--s-4);
}
.backlink:hover { color: var(--ink); }

.article-head .kicker {
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: var(--s-2);
}

.article-head h1 {
  font-size: clamp(2.1rem, 5vw, 3.25rem);
  line-height: 1.08;
  max-width: 24ch;
}

.article-body { max-width: 36rem; }
.article-body > * + * { margin-top: 1.35rem; }

.article-body p { font-size: 1.0625rem; line-height: 1.75; color: var(--ink-soft); max-width: none; }
.article-body p strong { color: var(--ink); font-weight: 600; }

.article-body h2 {
  font-family: var(--sans);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0;
  color: var(--ink);
  max-width: none;
  margin-top: var(--s-4);
}

.article-body blockquote {
  margin: var(--s-5) 0 0;
  padding-top: var(--s-3);
  border-top: 2px solid var(--ink);
}

.article-body blockquote p {
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.45;
  color: var(--ink);
}

.article-end { max-width: 36rem; margin-top: var(--s-6); padding-top: var(--s-4); border-top: 1px solid var(--rule); }
.article-end p { color: var(--ink-soft); max-width: none; }

/* ============ móvil ============ */

@media (max-width: 46rem) {
  :root { --gutter: 1.25rem; --s-6: 3.5rem; --s-7: 4.25rem; --s-5: 2.5rem; }
  body { font-size: 1rem; }
  .hero { padding-block: var(--s-5) var(--s-6); }
}

.cols-4 { grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); gap: var(--s-4) var(--s-3); }

/* ---------- ilustraciones de etapa ---------- */

.steps .step-icon {
  width: 52px;
  height: 52px;
  display: block;
  color: var(--accent);
  margin-bottom: 1.1rem;
}

.steps > div { border-top: 1px solid var(--rule); padding-top: var(--s-3); }
.steps > div::before { display: none; }
.steps h3 { margin-bottom: .45rem; }
.steps p { font-size: .9375rem; color: var(--ink-mute); }

.tools-note { font-size: .8125rem; line-height: 1.6; color: var(--ink-mute); max-width: 32rem; margin-top: 1.25rem; }

.btn-ghost .arrow { display: inline-block; }