/* ==========================================================================
   Sistema de diseño — paleta oficial (ver CLAUDE.md)
   ========================================================================== */
:root {
  --crema: #F5EBD0;
  --petroleo: #0F464C;
  --bordo: #7F011F;
  --menta: #C8DFDA;
  --oliva: #7A8055;

  --crema-2: #EDE0BE;            /* crema un paso más profundo para superficies */
  --tinta: var(--petroleo);
  --tinta-suave: rgba(15, 70, 76, .78);
  --linea: rgba(15, 70, 76, .18);

  --f-display: "Archivo", "Arial Narrow", system-ui, sans-serif;
  --f-text: "Public Sans", system-ui, -apple-system, "Segoe UI", sans-serif;

  --wrap: 1200px;
  --radius: 4px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--crema);
  color: var(--tinta);
  font-family: var(--f-text);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { margin: 0; font-family: var(--f-display); line-height: 1.02; }
p { margin: 0; }
a { color: inherit; }
button { font: inherit; color: inherit; }

:focus-visible { outline: 3px solid var(--bordo); outline-offset: 3px; }

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

.skip {
  position: absolute; left: 1rem; top: -4rem; z-index: 10;
  background: var(--petroleo); color: var(--crema);
  padding: .6rem 1rem; text-decoration: none; border-radius: var(--radius);
}
.skip:focus { top: 1rem; }

/* ---------- Masthead ---------- */
.masthead { background: var(--petroleo); color: var(--crema); }
.masthead__bar {
  display: flex; justify-content: space-between; align-items: center;
  padding-block: .85rem;
}
.brand {
  font-family: var(--f-display);
  font-weight: 800; font-stretch: 125%;
  text-transform: uppercase; letter-spacing: .02em; font-size: 1rem;
}
.brand__dot { color: var(--menta); padding-inline: .15em; }
.masthead__meta {
  font-family: var(--f-display); font-stretch: 112%;
  font-size: .75rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--menta);
}

/* ---------- Hero ---------- */
.hero { padding-block: clamp(3rem, 8vw, 6.5rem) clamp(2.5rem, 5vw, 4rem); border-bottom: 2px solid var(--petroleo); }
.eyebrow {
  font-family: var(--f-display); font-weight: 700; font-stretch: 112%;
  font-size: .78rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--bordo);
  margin-bottom: 1.25rem;
}
.hero__title {
  font-weight: 900; font-stretch: 125%;
  font-size: clamp(2.6rem, 7.4vw, 6.2rem);
  letter-spacing: -.035em;
  text-transform: uppercase;
  max-width: 14ch;
}
.hero__lead {
  margin-top: 1.75rem; max-width: 58ch;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--tinta-suave);
}
.hero__stats {
  display: flex; flex-wrap: wrap; gap: 0; margin: 2.5rem 0 0;
}
.hero__stats > div { padding-right: 2.5rem; margin-right: 2.5rem; border-right: 1px solid var(--oliva); }
.hero__stats > div:last-child { border-right: 0; }
.hero__stats dt {
  font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; font-weight: 600;
}
.hero__stats dd {
  margin: .15rem 0 0;
  font-family: var(--f-display); font-weight: 800; font-stretch: 125%;
  font-size: 2.5rem; line-height: 1; font-variant-numeric: tabular-nums;
}

/* ---------- Biblioteca ---------- */
.library { padding-block: clamp(2.5rem, 5vw, 4rem) 5rem; }
.library__head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.section-title {
  font-weight: 800; font-stretch: 118%; text-transform: uppercase;
  font-size: clamp(1.5rem, 3vw, 2.1rem); letter-spacing: -.01em;
}
.library__count { font-size: .9rem; font-variant-numeric: tabular-nums; }

/* ---------- Filtros ---------- */
.filters {
  margin-top: 1.5rem; padding: 1rem 0;
  border-block: 1px solid var(--linea);
  display: grid; gap: .75rem;
}
.filters__row { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.filters__label {
  flex: 0 0 5.5rem;
  font-family: var(--f-display); font-weight: 700; font-stretch: 112%;
  font-size: .75rem; letter-spacing: .14em; text-transform: uppercase;
}
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip {
  border: 1px solid var(--petroleo); background: transparent;
  padding: .38rem .85rem; border-radius: 999px;
  font-size: .9rem; font-weight: 600; cursor: pointer;
  transition: background .15s var(--ease), color .15s var(--ease);
}
.chip:hover { background: var(--menta); }
.chip[aria-pressed="true"] { background: var(--petroleo); color: var(--crema); }

/* ---------- Tarjetas ---------- */
.grid {
  margin-top: 2rem;
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr));
}
.card {
  position: relative;
  display: flex; flex-direction: column; gap: 1rem;
  text-align: left; width: 100%;
  background: var(--crema);
  border: 2px solid var(--petroleo); border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.25rem;
  cursor: pointer;
  box-shadow: 0 0 0 var(--petroleo);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.card:hover { transform: translate(-3px, -3px); box-shadow: 6px 6px 0 var(--petroleo); }
.card__top { display: flex; justify-content: space-between; align-items: center; gap: .75rem; }
.card__type {
  font-family: var(--f-display); font-weight: 700; font-stretch: 112%;
  font-size: .72rem; letter-spacing: .14em; text-transform: uppercase;
}
.card__year { font-family: var(--f-display); font-weight: 800; font-stretch: 125%; font-variant-numeric: tabular-nums; }
.card__title {
  font-family: var(--f-display);
  font-weight: 800; font-stretch: 108%;
  font-size: 1.45rem; line-height: 1.08; letter-spacing: -.01em;
}
.card__q { font-size: .95rem; color: var(--tinta-suave); }
.card__foot {
  margin-top: auto; padding-top: 1rem; border-top: 1px solid var(--oliva);
  display: flex; justify-content: space-between; align-items: end; gap: 1rem;
}
.card__n { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; font-weight: 600; }
.card__n strong {
  display: block; font-family: var(--f-display); font-weight: 800; font-stretch: 125%;
  font-size: 1.75rem; line-height: 1; letter-spacing: 0; font-variant-numeric: tabular-nums;
  text-transform: none;
}
.card__cta { font-weight: 700; font-size: .9rem; white-space: nowrap; }
.card__cta::after { content: " →"; color: var(--bordo); }

.tags { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; margin: 0; padding: 0; }
.tag {
  background: var(--menta); color: var(--petroleo);
  font-size: .78rem; font-weight: 600; padding: .2rem .6rem; border-radius: 999px;
}
.tag--zona { background: transparent; border: 1px solid var(--oliva); }

.badge-demo {
  font-family: var(--f-display); font-weight: 800; font-stretch: 112%;
  font-size: .68rem; letter-spacing: .14em;
  background: var(--bordo); color: var(--crema);
  padding: .2rem .5rem; border-radius: 2px;
}

.empty { margin-top: 2rem; font-size: 1.05rem; }
.link-btn { background: none; border: 0; padding: 0; text-decoration: underline; cursor: pointer; font-weight: 700; color: var(--bordo); }

/* ---------- Footer ---------- */
.footer { background: var(--petroleo); color: var(--crema); font-size: .9rem; }
.footer__inner { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-block: 2rem; }

/* ==========================================================================
   Ficha completa (dialog)
   ========================================================================== */
.sheet {
  width: min(100%, 980px); max-width: none; max-height: none; height: 100dvh;
  margin: 0 0 0 auto; padding: 0; border: 0;
  background: var(--crema); color: var(--tinta);
  border-left: 2px solid var(--petroleo);
}
html.is-locked { overflow: hidden; }
.sheet::backdrop { background: rgba(15, 70, 76, .55); backdrop-filter: blur(2px); }
.sheet[open] { animation: slide-in .35s var(--ease); }
@keyframes slide-in { from { transform: translateX(40px); opacity: 0; } }

.sheet__inner { padding: 0 clamp(1.25rem, 4vw, 3.5rem) 4rem; }
.sheet__bar {
  position: sticky; top: 0; z-index: 2;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding-block: 1rem; background: var(--crema);
  border-bottom: 1px solid var(--linea);
}
.sheet__close {
  border: 2px solid var(--petroleo); background: var(--crema);
  padding: .35rem .9rem; border-radius: 999px; font-weight: 700; cursor: pointer;
  white-space: nowrap; flex-shrink: 0;
}
.sheet__close:hover { background: var(--petroleo); color: var(--crema); }

.sheet__head { padding-block: 2.25rem 2rem; border-bottom: 2px solid var(--petroleo); }
.sheet__title {
  margin-top: .75rem;
  font-weight: 900; font-stretch: 118%; text-transform: uppercase;
  font-size: clamp(1.9rem, 4.6vw, 3.2rem); letter-spacing: -.025em;
}
.sheet__orig { margin-top: 1rem; font-style: italic; color: var(--tinta-suave); max-width: 70ch; }
.sheet__cite { margin-top: .75rem; font-size: .92rem; }

.demo-note {
  margin-top: 1.5rem; padding: .85rem 1rem;
  border-left: 4px solid var(--bordo); background: rgba(127, 1, 31, .07);
  font-size: .92rem;
}

.facts {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0; margin: 0; border-bottom: 1px solid var(--linea);
}
.facts > div { padding: 1.25rem 1rem 1.25rem 0; }
.facts > div + div { padding-left: 1rem; border-left: 1px solid var(--linea); }
.facts dt { font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; font-weight: 700; }
.facts dd { margin: .3rem 0 0; font-weight: 600; line-height: 1.35; }
.facts dd.num {
  font-family: var(--f-display); font-weight: 800; font-stretch: 125%;
  font-size: 1.75rem; line-height: 1; font-variant-numeric: tabular-nums; white-space: nowrap;
}

.block { padding-block: 2.25rem; border-bottom: 1px solid var(--linea); }
.block__label {
  display: flex; align-items: center; gap: .6rem;
  font-family: var(--f-display); font-weight: 800; font-stretch: 112%;
  font-size: .8rem; letter-spacing: .16em; text-transform: uppercase;
  margin-bottom: 1rem;
}
.block__label::before { content: ""; width: 1.5rem; height: 3px; background: var(--bordo); }
.block p { max-width: 70ch; }
.question {
  font-family: var(--f-display); font-weight: 700; font-stretch: 100%;
  font-size: clamp(1.3rem, 2.4vw, 1.75rem); line-height: 1.2; max-width: 32ch;
}

/* Resultados */
.results { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }
.result { border: 1px solid var(--linea); border-radius: var(--radius); padding: 1.25rem; background: var(--crema-2); }
.result__text { font-weight: 600; }
.result__split { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-top: 1rem; }
.result__split h4 {
  font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; font-stretch: 112%;
  margin-bottom: .25rem;
}
.result__split .stat h4 { color: var(--bordo); }
.result__split p { font-size: .95rem; }

/* Limitaciones */
.limits { margin: 0; padding: 0; list-style: none; counter-reset: lim; display: grid; gap: .75rem; }
.limits li { counter-increment: lim; display: grid; grid-template-columns: 2.25rem 1fr; max-width: 75ch; }
.limits li::before {
  content: counter(lim, decimal-leading-zero);
  font-family: var(--f-display); font-weight: 800; font-stretch: 125%; color: var(--oliva);
}

/* Aplicación práctica — bloque destacado */
.apply { margin-top: 2.25rem; background: var(--petroleo); color: var(--crema); padding: clamp(1.5rem, 3vw, 2.25rem); border-radius: var(--radius); }
.apply .block__label { color: var(--menta); }
.apply p { font-size: 1.12rem; max-width: 65ch; }

.doi-link {
  display: inline-flex; align-items: center; gap: .5rem; margin-top: 2rem;
  background: var(--bordo); color: var(--crema); text-decoration: none;
  padding: .8rem 1.25rem; border-radius: var(--radius); font-weight: 700;
}
.doi-link:hover { background: #5f0017; }
.doi-link[aria-disabled="true"] { background: transparent; color: var(--tinta); border: 2px dashed var(--oliva); cursor: not-allowed; }

/* ==========================================================================
   Gráfico comparativo
   ========================================================================== */
.chart {
  background: var(--petroleo); color: var(--crema);
  border-radius: var(--radius); padding: clamp(1.25rem, 3vw, 2rem);
  margin-top: 2.25rem;
}
.chart__title { font-family: var(--f-display); font-weight: 700; font-stretch: 108%; font-size: 1.1rem; line-height: 1.25; }
.chart__unit { font-size: .85rem; color: var(--menta); margin-top: .25rem; }
.chart__svg { display: block; width: 100%; height: auto; margin-top: 1.25rem; overflow: visible; }
.chart__svg .grid-line { stroke: rgba(245, 235, 208, .14); stroke-width: 1; }
.chart__svg .baseline { stroke: var(--crema); stroke-width: 1.5; }
.chart__svg .axis-text { fill: rgba(245, 235, 208, .75); font: 500 12px var(--f-text); font-variant-numeric: tabular-nums; }
.chart__svg .cat-text { fill: var(--crema); font: 600 14px var(--f-text); }
.chart__svg .val-text { fill: var(--crema); font: 800 20px var(--f-display); font-stretch: 125%; font-variant-numeric: tabular-nums; }
.chart__svg .bar--alerta { stroke: var(--crema); stroke-width: 1.5; stroke-opacity: .9; }
.chart__svg .trivial-band { fill: var(--oliva); fill-opacity: .22; }
.chart__svg .band-text { fill: rgba(245, 235, 208, .7); font: 600 11px var(--f-text); letter-spacing: .08em; text-transform: uppercase; }
.chart__svg .bar { transition: opacity .15s var(--ease); }
.chart__svg .hit { fill: transparent; cursor: default; }
.chart__svg.is-hovering .bar:not(.is-active) { opacity: .45; }
.chart__note { margin-top: 1rem; font-size: .82rem; color: rgba(245, 235, 208, .8); }
.chart details { margin-top: 1rem; font-size: .9rem; }
.chart summary { cursor: pointer; font-weight: 600; color: var(--menta); }
.chart table { margin-top: .75rem; border-collapse: collapse; min-width: 260px; }
.chart th, .chart td { text-align: left; padding: .35rem 1.5rem .35rem 0; border-bottom: 1px solid rgba(245, 235, 208, .2); }
.chart td.num { font-variant-numeric: tabular-nums; text-align: right; }

.tooltip {
  position: fixed; z-index: 100; pointer-events: none;
  background: var(--crema); color: var(--petroleo);
  border: 2px solid var(--petroleo); border-radius: var(--radius);
  padding: .45rem .7rem; font-size: .85rem; line-height: 1.35;
  box-shadow: 4px 4px 0 rgba(15, 70, 76, .35);
  transform: translate(-50%, calc(-100% - 12px));
}
.tooltip strong { font-family: var(--f-display); font-stretch: 125%; font-size: 1.05rem; }

/* ---------- Estados de carga / error ---------- */
.notice { padding: 1.25rem; border: 2px solid var(--bordo); border-radius: var(--radius); }

@media (max-width: 640px) {
  .hero__stats > div { padding-right: 1.25rem; margin-right: 1.25rem; }
  .filters__label { flex-basis: 100%; }
  .masthead__meta { display: none; }
  .sheet { border-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}