/* Colores: variables --bg, --surface, --fg, --link… las inyecta Base.astro desde el tema de la web (lib/theme.ts),
   ya validadas contra WCAG 2.2 AA. Aquí solo hay estructura. */
:root {
  --radius: 10px; --wrap: 1120px;
  /* Sombras mínimas: la jerarquía la dan los bordes y el espacio, no el relieve. */
  --shadow: none;
  --shadow-hover: 0 1px 3px rgb(0 0 0 / .1);
  --ring: 0 0 0 4px color-mix(in srgb, var(--focus) 22%, transparent);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 76px; }
body { margin: 0; font: 18px/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif; -webkit-font-smoothing: antialiased; background: var(--bg); color: var(--fg); }
h1, h2, h3 { line-height: 1.25; text-wrap: balance; }
h1 { font-size: clamp(1.9rem, 4.8vw, 2.8rem); margin: .4em 0 .3em; letter-spacing: -.025em; font-weight: 750; line-height: 1.15; }
h2 { font-size: clamp(1.35rem, 3vw, 1.7rem); margin: 1.8em 0 .6em; letter-spacing: -.015em; font-weight: 700; }
h3 { font-size: 1.15rem; margin: 1.4em 0 .5em; }
a { color: var(--link); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
main.wrap { padding-top: 12px; padding-bottom: 56px; min-height: 60vh; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--btn-bg); color: var(--btn-fg); padding: 10px 14px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 8px; }
.demo-banner { margin: 0; padding: 8px 20px; background: var(--demo-bg); color: var(--demo-fg); font-size: 14px; text-align: center; border-bottom: 1px solid var(--line); }

/* Cabecera y pie */
.site-header { border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: saturate(1.4) blur(8px); position: sticky; top: 0; z-index: 5; }
.bar { display: flex; flex-wrap: wrap; gap: 6px 20px; align-items: center; justify-content: space-between; padding-top: 10px; padding-bottom: 10px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; font-size: 1.1rem; letter-spacing: -.01em; text-decoration: none; color: var(--fg); }
.brand-mark { display: block; width: 28px; height: 28px; flex: none; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 4px 6px; font-size: 16px; }
.site-header nav a { padding: 8px 12px; border-radius: 999px; text-decoration: none; color: var(--fg); min-height: 36px; transition: background-color .15s, color .15s; }
.site-header nav a:hover { background: var(--accent-soft); }
.site-header nav a[aria-current="page"] { background: var(--accent-soft); font-weight: 650; box-shadow: inset 0 0 0 1px var(--line); }
.site-footer { border-top: 1px solid var(--line); background: var(--surface); font-size: 15px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 22px; padding-top: 20px; padding-bottom: 20px; }

/* Portada y tarjetas */
.hero { margin-top: 16px; padding: clamp(24px, 5vw, 48px) 0 clamp(20px, 4vw, 32px); border-bottom: 1px solid var(--line); }
.eyebrow { margin: 0; font-size: .9rem; font-weight: 650; letter-spacing: .06em; text-transform: uppercase; color: var(--link); }
.hero h1 { margin-top: .25em; max-width: 20ch; }
.hero .lead { margin-bottom: 0; }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 62ch; }
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 270px), 1fr)); }
/* Cuatro herramientas: 1, 2 × 2 o 4 en fila, nunca 3 + 1. */
.cards.quad { grid-template-columns: minmax(0, 1fr); }
@media (min-width: 560px) { .cards.quad { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1000px) { .cards.quad { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.cards > li { display: contents; }
.card { position: relative; display: grid; align-content: start; gap: 6px; height: 100%; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); text-decoration: none; color: var(--fg); transition: border-color .15s, background-color .15s; }
.card:hover { border-color: var(--link); background: var(--surface); }
.card.tool { padding-right: 40px; }
.card.tool::after { content: "→" / ""; position: absolute; right: 16px; top: 16px; color: var(--link); transition: transform .15s; }
.card.tool:hover::after { transform: translateX(3px); }
.card strong { color: var(--link); font-size: 1.05rem; }
.card span { color: var(--muted); font-size: 15px; }
.card.featured { background: var(--surface); }
.card.featured strong { font-size: 1.15rem; }
.card .go { font-style: normal; font-weight: 600; color: var(--accent-ink); font-size: 15px; margin-top: 4px; }
.group + .group { margin-top: 24px; }
.group h3 { margin-top: 0; color: var(--muted); font-size: .95rem; text-transform: uppercase; letter-spacing: .06em; }
.search { margin: 18px 0 0; display: grid; gap: 6px; max-width: 520px; }
.search label { font-weight: 600; }
[hidden] { display: none !important; }

/* Artículo */
.article { max-width: 72ch; margin: 0 auto; }
.article.wide { max-width: 1040px; }
.article-body.with-toc { display: grid; gap: 28px; grid-template-columns: minmax(0, 1fr) 250px; grid-template-areas: "body toc"; align-items: start; }
.article-body.with-toc .prose { grid-area: body; }
.toc { grid-area: toc; position: sticky; top: 84px; font-size: 15px; border-left: 3px solid var(--line); padding-left: 14px; }
.toc summary { font-weight: 700; cursor: pointer; padding: 6px 0; }
.toc ol { list-style: none; margin: 4px 0 0; padding: 0; display: grid; gap: 2px; }
.toc a { display: block; padding: 5px 0; color: var(--fg); text-decoration: none; }
.toc a:hover { color: var(--link); text-decoration: underline; }
.toc .l3 { padding-left: 14px; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 8px; padding: 0; margin: 8px 0; font-size: 15px; color: var(--muted); }
.crumbs li + li::before { content: "›"; margin-right: 8px; }
.meta { display: flex; flex-wrap: wrap; gap: 4px 16px; color: var(--muted); font-size: 15px; margin: 0 0 18px; }
.prose p, .prose li { max-width: 70ch; }
.prose h2 { margin-top: 1.9em; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose table { border-collapse: collapse; width: 100%; display: block; overflow-x: auto; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.prose th { background: var(--surface); }
.author { margin-top: 40px; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.author p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }

/* Calculadora: formulario y resultados en dos columnas en escritorio; en móvil, el formulario primero y el resultado debajo */
.calculator { margin: 12px 0 8px; }
/* Reserva el alto de cada calculadora antes de que el script la monte: sin ello todo lo que hay debajo salta de sitio (CLS). */
.calculator[data-calculator="gravel"], .calculator[data-calculator="asphalt"], .calculator[data-calculator="concrete"], .calculator[data-calculator="mulch"], .calculator[data-calculator="paver"] { min-height: 600px; }
.calculator[data-calculator="sod"] { min-height: 600px; }
.calculator[data-calculator="deck"] { min-height: 900px; }
@media (max-width: 860px) {
  .calculator[data-calculator="gravel"], .calculator[data-calculator="asphalt"], .calculator[data-calculator="concrete"], .calculator[data-calculator="mulch"], .calculator[data-calculator="paver"] { min-height: 1100px; }
  .calculator[data-calculator="sod"] { min-height: 1100px; }
  .calculator[data-calculator="deck"] { min-height: 1500px; }
}
.calc-layout { display: grid; gap: 20px; grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); align-items: start; }
.calc-layout > .calc { display: grid; gap: 22px; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; background: var(--bg); }

/* Secciones del formulario */
.form-section { display: grid; gap: 16px; }
.form-title { margin: 0; font-size: .85rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.form-section.assumptions { padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.calc-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; font-size: 15px; }
.tool-link { padding: 8px 0; min-height: 24px; }
.example-btn { padding: 6px 14px; font-weight: 600; }
.example-confirm { margin: 0; padding: 12px; border-radius: 8px; background: var(--surface); border: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.example-confirm:empty { display: none; }
.layout-fig { margin: 0; padding: 12px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.layout-fig .dg { display: block; width: 100%; max-width: 360px; height: auto; margin: 0 auto; }

/* Campo y medida: etiqueta visible arriba; número y unidad forman un solo control con la misma altura */
.field { display: grid; gap: 6px; align-content: start; }
.label { font-weight: 600; line-height: 1.35; }
.label.sm { font-weight: 500; font-size: 15px; }
.mark { display: inline-grid; place-items: center; width: 1.45em; height: 1.45em; border-radius: 50%; background: var(--link); color: var(--bg); font-size: .8em; font-weight: 700; line-height: 1; vertical-align: .05em; }
.q { display: grid; grid-template-columns: minmax(0, 1fr) auto; width: 100%; max-width: 22rem; }
.q.no-unit { grid-template-columns: minmax(0, 1fr); }
.q > input { min-width: 0; width: 100%; border-top-right-radius: 0; border-bottom-right-radius: 0; }
.q.no-unit > input { border-radius: 10px; }
.q > .q-unit { margin-left: -1px; border-top-left-radius: 0; border-bottom-left-radius: 0; background: var(--surface); }
.q > select.q-unit { min-width: 4.5em; padding-right: 8px; }
.q > .u { display: inline-flex; align-items: center; padding: 0 14px; min-height: 44px; border: 1px solid var(--field-line); border-radius: 0 10px 10px 0; color: var(--muted); }
.q > input:focus-visible, .q > select:focus-visible { position: relative; z-index: 1; }
select.choice { width: 100%; max-width: 22rem; }
input, select, button { font: inherit; padding: 8px 12px; border: 1px solid var(--field-line); border-radius: 10px; background: var(--bg); color: var(--fg); min-height: 44px; transition: border-color .15s, box-shadow .15s, background-color .15s; }
input:hover, select:hover { border-color: var(--link); }
input:focus-visible, select:focus-visible, button:focus-visible { box-shadow: var(--ring); }
.field > small { font-size: 14px; line-height: 1.45; margin-top: -2px; }
input[type="checkbox"] { min-height: 0; width: 20px; height: 20px; flex: none; }
button { cursor: pointer; }
button:hover { border-color: var(--link); background: var(--accent-soft); }
button:active { transform: translateY(1px); }
.advanced { border: 1px solid var(--line); border-radius: var(--radius); padding: 0 16px; }
.advanced summary { font-weight: 600; cursor: pointer; padding: 8px 0; color: var(--link); min-height: 44px; display: flex; align-items: center; }
.advanced[open] { padding-bottom: 16px; }
.advanced[open] summary { margin-bottom: 8px; }
.adv-group { display: grid; gap: 16px; }
.adv-group + .adv-group { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.adv-title { margin: 0; font-size: .85rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }

/* Figuras: una tarjeta por figura, con su diagrama y sus medidas */
.shapes-help { margin: 0; font-size: 14px; line-height: 1.5; color: var(--muted); }
.shapes { display: grid; gap: 12px; }
.shape { display: grid; gap: 12px; padding: 14px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.shape.is-subtracted { border-style: dashed; border-color: var(--warn-fg); }
.shape-head { display: flex; align-items: center; gap: 10px; }
.shape-name { flex: 1 1 auto; font-size: 1rem; }
.shape-kind { flex: 0 1 auto; }
.rm { padding: 0; width: 44px; flex: none; }
.rm:disabled { opacity: .45; cursor: not-allowed; }
.shape-body { display: grid; gap: 14px; grid-template-columns: 140px minmax(0, 1fr); align-items: center; }
.shape-fig .dg { display: block; width: 100%; height: auto; }
.dims { display: grid; gap: 12px; }
.sf { display: grid; gap: 4px; }
.sub { display: flex; align-items: center; gap: 10px; min-height: 32px; }
.add { margin-top: 4px; width: 100%; font-weight: 600; border-style: dashed; }

/* Diagramas */
.dg { color: var(--muted); }
.dg-shape { fill: var(--accent-soft); stroke: var(--link); stroke-width: 1.5; }
.dg-dim { stroke: var(--muted); stroke-width: 1.2; fill: none; }
.dg-dim.dashed { stroke-dasharray: 3 3; }
.dg-joist { stroke: var(--field-line); stroke-width: 3; }
.dg-text { fill: var(--muted); font-size: 10px; font-family: inherit; }
.dg-badge { fill: var(--link); }
.dg-badge-text { fill: var(--bg); font-size: 9px; font-weight: 700; font-family: inherit; }

/* Zona de resultados: siempre presente (vacía, incompleta, con errores o válida) */
.results-panel { position: sticky; top: 84px; border: 1px solid var(--line); border-top: 3px solid var(--link); border-radius: var(--radius); padding: 22px; background: var(--surface); }
.results-panel[data-state="error"] { border-top-color: var(--warn-fg); }
.results-panel:not([data-state="valid"]) .out .k, .results-panel:not([data-state="valid"]) .out strong { color: var(--muted); }
.panel-title { margin: 0 0 8px; font-size: .85rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.panel-title:focus-visible { outline-offset: 4px; }
.state { margin: 0 0 12px; display: grid; gap: 2px; }
.state-title { font-size: 1.05rem; }
.state-msg { color: var(--muted); font-size: 15px; }
.results-panel[data-state="error"] .state { padding: 10px 12px; border-left: 3px solid var(--warn-fg); border-radius: 6px; background: var(--warn-bg); }
.results-panel[data-state="error"] .state-msg, .results-panel[data-state="error"] .state-title { color: var(--warn-fg); }
.results-panel[data-state="valid"] .state { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.results { display: grid; gap: 0; }
.res-group { margin-top: 18px; }
.res-group.first { margin-top: 8px; }
.res-title { margin: 0 0 2px; font-size: .85rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.res-collapsible { border-top: 1px solid var(--line); padding-top: 4px; }
.res-collapsible summary { cursor: pointer; font-weight: 600; color: var(--link); min-height: 44px; display: flex; align-items: center; }
.out { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; border-bottom: 1px solid var(--line); padding: 8px 0; }
.out .k { color: var(--muted); }
.out strong { font-variant-numeric: tabular-nums; text-align: right; }
.out.primary { display: grid; gap: 2px; border-bottom: 2px solid var(--line); padding-bottom: 12px; margin-bottom: 4px; }
.out.primary .k { color: var(--fg); font-weight: 600; }
.out.primary strong { font-size: clamp(2.2rem, 6vw, 3rem); line-height: 1.1; letter-spacing: -.02em; color: var(--link); text-align: left; }
.assumed { margin: 12px 0 0; font-size: 14px; color: var(--muted); }
.warn { background: var(--warn-bg); color: var(--warn-fg); padding: 10px 12px; border-radius: 8px; margin: 8px 0 0; }
.hint, small { color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.actions button { background: var(--bg); }
.actions .cta { background: var(--btn-bg); color: var(--btn-fg); border-color: var(--btn-bg); font-weight: 600; }
.actions .cta:hover { background: var(--btn-bg-hover); border-color: var(--btn-bg-hover); }
.actions .hint { flex-basis: 100%; margin: 0; }
.cutplan { border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin-top: 8px; background: var(--bg); } .cutplan ul { margin: 6px 0 0; padding-left: 18px; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.field-error { display: none; font-size: 14px; line-height: 1.45; padding: 6px 10px; border-left: 3px solid var(--warn-fg); border-radius: 6px; background: var(--warn-bg); color: var(--warn-fg); }
.field-error:not(:empty) { display: block; }
.field-error:not(:empty)::before { content: "⚠ " / ""; }
[aria-invalid="true"] { border-color: var(--warn-fg); border-width: 2px; }
.sources-wrap { overflow-x: auto; }
table.sources { width: 100%; border-collapse: collapse; font-size: 15px; }
.sources th, .sources td { text-align: left; border-bottom: 1px solid var(--line); padding: 8px 6px; vertical-align: top; }
.sources td a { display: inline-block; min-height: 24px; padding: 2px 0; margin-right: 8px; } /* objetivo táctil ≥ 24 px (WCAG 2.5.8) */

/* Navegación móvil: todos los enlaces visibles a la vez (sin desplazamiento oculto, que dejaba Deck cortado a ~325 px),
   repartidos en filas que se ajustan al ancho. La cabecera deja de ser fija: con dos filas tapaba demasiado y, fija, podía
   cubrir el control enfocado (WCAG 2.4.11). Los enlaces de las herramientas también están en el pie. */
@media (max-width: 720px) {
  .bar { gap: 2px; padding-bottom: 6px; }
  .site-header { position: static; }
  .site-header nav { flex-basis: 100%; gap: 6px; padding: 2px 0 4px; font-size: 15px; }
  .site-header nav a { flex: 1 1 auto; justify-content: center; text-align: center; min-height: 44px; display: inline-flex; align-items: center; padding: 8px 10px; border: 1px solid var(--line); }
  .site-header nav a[aria-current="page"] { border-color: var(--link); }
  html { scroll-padding-top: 12px; }
  .hero { margin-top: 8px; }
  .site-footer .wrap { gap: 0 18px; }
  .site-footer a, .site-footer .linklike { display: inline-flex; align-items: center; min-height: 44px; }
}
@media (max-width: 860px) {
  /* La barra del resultado ocupa el borde inferior: lo enfocado por teclado no debe quedar debajo. */
  html { scroll-padding-bottom: 128px; }
  .results-panel { position: static; }
  .calc-layout { grid-template-columns: minmax(0, 1fr); }
  .article-body.with-toc { grid-template-columns: minmax(0, 1fr); grid-template-areas: "toc" "body"; }
  .toc { position: static; border-left: 0; padding: 0; }
  .toc ol { margin-bottom: 8px; }
}
/* Tabla de valores y fuentes: en móvil, una ficha por fila con la etiqueta de cada dato; la cabecera queda solo para lectores de pantalla. */
@media (max-width: 640px) {
  .sources thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .sources, .sources tbody, .sources tr, .sources td { display: block; width: 100%; }
  .sources tr { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); padding: 6px 14px; margin-bottom: 12px; }
  .sources td { border: 0; padding: 8px 0; display: grid; gap: 2px; }
  .sources td + td { border-top: 1px solid var(--line); }
  .sources td::before { content: attr(data-label); font-size: 13px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
  .sources td a { display: inline-block; padding: 4px 0; margin-right: 12px; }
}
@media (max-width: 520px) {
  body { font-size: 17px; }
  .calc-layout > .calc, .results-panel { padding: 16px; }
  .shape-body { grid-template-columns: minmax(0, 1fr); }
  .shape-fig .dg { max-width: 150px; margin: 0 auto; }
}
.example { display: grid; grid-template-columns: minmax(0, max-content) minmax(0, 1fr); gap: 6px 18px; margin: 0 0 12px; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.example dt { color: var(--muted); }
.example dd { margin: 0; font-variant-numeric: tabular-nums; }
.example dt, .example dd { overflow-wrap: anywhere; }
@media (max-width: 520px) { .example { grid-template-columns: minmax(0, 1fr); gap: 0; } .example dd { margin-bottom: 10px; } }
.example dd.primary { font-weight: 700; }
.result-chip { display: none; }
@media (max-width: 860px) {
  .result-chip:not([hidden]) { display: block; position: fixed; left: 12px; right: 12px; bottom: max(12px, env(safe-area-inset-bottom)); z-index: 5; padding: 14px 16px; border: 2px solid var(--link); border-radius: var(--radius); background: var(--bg); color: var(--link); font-weight: 700; text-align: center; text-decoration: none; box-shadow: 0 2px 8px rgb(0 0 0 / .18); }
}
@media print { .result-chip { display: none !important; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
@media print { .site-header, .site-footer, .demo-banner, .actions, form, .add, .rm, .search, .toc { display: none; } .results-panel { border: 0; background: none; position: static; } .results-panel:not([data-state="valid"]) { display: none; } .res-collapsible > summary { display: none; } .calc-layout { display: block; } }
.consent { position: fixed; inset: auto 0 0 0; z-index: 20; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; padding: 14px 20px; background: var(--surface); border-top: 1px solid var(--line); font-size: 15px; }
.consent[hidden] { display: none; }
.consent p { margin: 0; flex: 1 1 280px; }
.linklike { background: none; border: 0; padding: 0; font: inherit; color: var(--link, inherit); text-decoration: underline; cursor: pointer; }
@media print { .consent, .linklike { display: none; } }
.holder { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0 0 16px; }
.holder dt { font-weight: 600; }
.holder dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 480px) { .holder { grid-template-columns: 1fr; gap: 0; } .holder dd { margin-bottom: 10px; } }