:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --bg-alt: #f5f8fd;
  --surface: #ffffff;
  --border: #dde5f1;
  --text: #0e1626;
  --muted: #5a6880;
  --accent: #2563eb;
  --accent-soft: #eef4ff;
  --ok: #15803d;
  --ok-soft: #f0fdf4;
  --ok-border: #bbf7d0;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px rgba(15, 23, 42, .05);
  --radius: 14px;
  --max: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --bg-alt: #0f1628;
    --surface: #141c31;
    --border: #263450;
    --text: #eaeff8;
    --muted: #98a6be;
    --accent: #6ea2ff;
    --accent-soft: #16233f;
    --ok: #5ee08d;
    --ok-soft: #10251a;
    --ok-border: #235c39;
    --code-bg: #060b16;
    --code-text: #dbe4f2;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

.skip {
  position: absolute; left: -999px;
  background: var(--accent); color: #fff; padding: .6rem 1rem; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; top: 0; z-index: 10; }

/* ---------------------------------------------------------------- portada */

.hero {
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 0 3rem;
}

.banner img { width: 100%; height: auto; display: block; border-radius: var(--radius); }

.lede {
  max-width: 62ch;
  font-size: 1.14rem;
  margin: 1.8rem 0 0;
}
.lede.muted { color: var(--muted); font-size: 1.02rem; margin-top: .9rem; }

.cta { display: flex; flex-wrap: wrap; gap: .7rem; margin: 2rem 0 0; }

.btn {
  display: inline-block;
  padding: .72rem 1.35rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: .95rem;
  box-shadow: var(--shadow);
  transition: transform .12s ease, border-color .12s ease;
}
.btn:hover { transform: translateY(-1px); border-color: var(--accent); }
.btn.primary { background: var(--accent); color: #fff; border-color: transparent; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.facts {
  display: flex; flex-wrap: wrap; gap: 2.2rem;
  margin: 2.2rem 0 0; padding: 0; list-style: none;
  color: var(--muted); font-size: .92rem;
}
.facts strong {
  display: block; font-size: 1.6rem; line-height: 1.2;
  color: var(--text); font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------- secciones */

main section { padding: 3.4rem 0; border-bottom: 1px solid var(--border); }
main section:last-child { border-bottom: none; }

h2 { font-size: 1.7rem; margin: 0 0 .5rem; letter-spacing: -.01em; }
h3 { font-size: 1.05rem; margin: 0 0 .5rem; }

.section-lede { color: var(--muted); max-width: 66ch; margin: 0 0 1.8rem; }

.cards {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  box-shadow: var(--shadow);
}
.card p { margin: 0 0 .5rem; color: var(--muted); font-size: .95rem; }
.card p:last-child { margin-bottom: 0; }
.card.ok { border-left: 3px solid var(--ok); }
.card .mono {
  font-family: "Cascadia Code", Consolas, "SF Mono", Menlo, monospace;
  font-size: .84rem; color: var(--accent); word-break: break-all;
}

figure { margin: 0; }
figure img {
  width: 100%; height: auto; display: block;
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
}
figcaption { color: var(--muted); font-size: .88rem; margin-top: .7rem; }
.diagram img { border: none; box-shadow: none; }

/* ---------------------------------------------------------------- formatos */

.formats {
  display: grid; gap: .8rem;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.formats > div {
  border: 1px solid var(--border); border-radius: 12px;
  padding: .9rem 1rem; background: var(--surface);
}
.ext {
  display: inline-block;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: .82rem; font-weight: 700;
  color: var(--accent); background: var(--accent-soft);
  padding: .12rem .55rem; border-radius: 999px;
}
.formats p { margin: .5rem 0 0; color: var(--muted); font-size: .9rem; }

/* ------------------------------------------------------------------ pasos */

.steps { display: grid; gap: 1.2rem; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.step {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.4rem;
}
.step ol { margin: 0; padding-left: 1.2rem; color: var(--muted); }
.step li { margin: .35rem 0; }
.small { font-size: .86rem; }
.muted { color: var(--muted); }

pre {
  background: var(--code-bg); color: var(--code-text);
  padding: 1rem 1.1rem; border-radius: 10px;
  overflow-x: auto; font-size: .85rem; line-height: 1.6; margin: 0 0 .8rem;
}
code {
  font-family: "Cascadia Code", Consolas, "SF Mono", Menlo, monospace;
  font-size: .88em;
}
:not(pre) > code {
  background: var(--accent-soft); color: var(--accent);
  padding: .08rem .38rem; border-radius: 5px;
}

/* -------------------------------------------------------------- honestidad */

.honesty {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 3px solid var(--muted);
  border-radius: var(--radius);
  padding: 1.4rem 1.6rem;
}
.honesty p { margin: 0 0 .7rem; color: var(--muted); }
.honesty strong { color: var(--text); }
.honesty .more { margin: 1rem 0 0; }
.honesty a { color: var(--accent); font-weight: 600; }

/* ------------------------------------------------------------ documentacion */

.docs { display: grid; gap: .7rem; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.docs a {
  display: block; text-decoration: none;
  border: 1px solid var(--border); border-radius: 12px;
  padding: .9rem 1.1rem; background: var(--surface);
  color: var(--text); font-weight: 600; font-size: .96rem;
  transition: border-color .12s ease, transform .12s ease;
}
.docs a:hover { border-color: var(--accent); transform: translateY(-1px); }
.docs a span { display: block; font-weight: 400; font-size: .86rem; color: var(--muted); margin-top: .15rem; }

/* ------------------------------------------------------------------ cierre */

footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0 3rem;
}
footer p { margin: 0 0 .7rem; max-width: 70ch; }
footer a { color: var(--accent); }

@media (max-width: 640px) {
  h2 { font-size: 1.4rem; }
  .lede { font-size: 1.05rem; }
  .facts { gap: 1.4rem; }
  main section { padding: 2.4rem 0; }
}