/* GraphKind — el mapa y no la respuesta · diseño */
:root {
  --paper: #faf9f6;
  --card: #ffffff;
  --ink: #16161a;
  --muted: #6b6b6b;
  --line: #e4e2dc;
  --green: #0b6b3a;
  --blue: #26557a;
  --gold: #9a7b1f;
  --red: #a33;
  --serif: Georgia, "DejaVu Serif", "Times New Roman", serif;
  --sans: system-ui, -apple-system, "DejaVu Sans", "Segoe UI", sans-serif;
  --mono: "DejaVu Sans Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 18px/1.68 var(--serif);
  -webkit-font-smoothing: antialiased;
}
main, .hero, footer { max-width: 860px; margin: 0 auto; padding: 0 22px; }
h1, h2, h3, .nav, button, .tabla th, .cifra span { font-family: var(--sans); }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 2px; }
code { font-family: var(--mono); font-size: .86em; background: #f1efe9; padding: 1px 5px; border-radius: 4px; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; flex-wrap: wrap; gap: 14px; align-items: baseline;
  padding: 10px 22px; background: rgba(250, 249, 246, .94);
  border-bottom: 1px solid var(--line); backdrop-filter: blur(6px);
  font-size: 14px;
}
.nav-brand { font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: 13px; color: var(--green); }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--ink); }

/* hero */
.hero { padding-top: 34px; text-align: center; }
.banner { width: 100%; max-width: 720px; }
.hero h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.15; margin: 22px 0 10px; letter-spacing: -.01em; }
.lead { font-size: 20px; color: #333; max-width: 640px; margin: 0 auto; }
.meta { font-size: 15px; color: var(--muted); font-family: var(--sans); }

/* secciones */
section { padding: 44px 0 8px; border-top: 1px solid var(--line); margin-top: 40px; }
section:first-of-type { border-top: none; }
h2 { font-size: 27px; margin: 0 0 18px; letter-spacing: -.01em; }
h2 .n {
  display: inline-grid; place-items: center; width: 34px; height: 34px; margin-right: 10px;
  background: var(--green); color: #fff; border-radius: 50%; font-size: 17px; vertical-align: 3px;
}
h3 { font-size: 20px; margin: 30px 0 8px; }
p { margin: 0 0 16px; }
ul { padding-left: 22px; }
li { margin-bottom: 8px; }

/* cajas */
.caja {
  background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--blue);
  border-radius: 10px; padding: 16px 20px 6px; margin: 22px 0;
}
.caja.aviso { border-left-color: var(--red); }
.caja.aviso ul { margin-top: 6px; }

/* figuras */
.fig { margin: 26px 0; }
.fig img { width: 100%; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
figure { margin: 0; }
figcaption { font-size: 14.5px; color: var(--muted); margin-top: 8px; font-family: var(--sans); }

/* tablas */
.tabla { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 16px; }
.tabla th, .tabla td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tabla th { font-size: 14px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }

/* cifras */
.cifras { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin: 20px 0 24px; }
.cifra { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px 8px; }
.cifra span { display: block; font-size: 26px; font-weight: 700; color: var(--green); margin-bottom: 6px; }
.cifra p { font-size: 15.5px; color: #333; }

/* demos */
.demo {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px 22px 14px; margin: 26px 0; box-shadow: 0 1px 0 rgba(0,0,0,.02);
}
.demo-head h3 { margin-top: 0; }
.demo-head p { color: #333; font-size: 16.5px; }
.grafo { display: block; width: 100%; height: auto; background: #fff; }
.grafo circle { transition: fill .35s ease; }
.grafo line { stroke-linecap: round; }
.t4-grid, .par-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 16px 0; }
.t4-grid figure, .par-grid figure { text-align: center; }
.t4-grid svg { max-height: 300px; }
.par svg { max-height: 240px; }
.t4-controls { display: flex; flex-wrap: wrap; gap: 22px; align-items: center; margin: 8px 0 6px; }
.slider { font-family: var(--sans); font-size: 15px; display: flex; align-items: center; gap: 12px; }
.slider input { width: 180px; accent-color: var(--green); }
.tray { border-collapse: collapse; font-family: var(--mono); font-size: 15px; }
.tray th, .tray td { padding: 4px 12px; text-align: center; border-bottom: 1px solid var(--line); color: var(--muted); }
.tray th { font-weight: 600; color: var(--ink); }
.tray td.act, .tray th.act { background: #eef6f0; color: var(--green); font-weight: 700; border-radius: 6px; }

/* botones */
.botones { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.botones.k { margin-bottom: 18px; }
button {
  font: 14.5px var(--sans); padding: 8px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: #fff; color: var(--ink); cursor: pointer;
}
button:hover { border-color: var(--muted); }
button.act { background: var(--ink); color: #fff; border-color: var(--ink); }

/* veredicto */
.verdict-line { font-family: var(--sans); font-size: 16px; margin: 12px 0 6px; }
.verdict { font-weight: 700; letter-spacing: .04em; }
.verdict.sep { color: var(--green); }
.verdict.col { color: var(--gold); }
.desc { color: #333; font-size: 16px; }
.fuente { font-size: 14px; color: var(--muted); font-family: var(--sans); }

/* cierre */
.mapa li { margin-bottom: 6px; }
.quote { font-style: italic; color: #333; border-left: 3px solid var(--line); padding-left: 16px; margin-top: 22px; }

/* footer */
footer { border-top: 1px solid var(--line); margin-top: 48px; padding: 22px 22px 40px; font-size: 15px; color: var(--muted); }
footer .small { font-size: 13.5px; }

/* responsive */
@media (max-width: 640px) {
  body { font-size: 17px; }
  .t4-grid, .par-grid { grid-template-columns: 1fr; }
  .nav { gap: 10px; font-size: 13px; }
  .hero { padding-top: 22px; }
}