/* Base: reset, tipografía, layout, cabecera, pie, botones, marcos */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 16px; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  color: var(--ink); font: 400 1.0625rem/1.6 var(--font-body); overflow-wrap: break-word;
  background-color: var(--paper);
  background-image: var(--bg-art-lite); background-repeat: no-repeat;
}
img, svg { max-width: 100%; }
a { color: var(--line); text-underline-offset: 3px; }
:focus-visible {
  outline: 2px solid var(--focus); outline-offset: 3px;
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--focus) 25%, transparent);
}
/* Dentro de contenedores redondeados con overflow (vidrio) el anillo exterior se recorta: va hacia adentro. */
:is(.related, .steps, .spec, .titleblock, .results-group, .search-panel) :focus-visible {
  outline-offset: -3px; box-shadow: inset 0 0 0 5px color-mix(in srgb, var(--focus) 25%, transparent);
}
h1, h2, h3 { font-family: var(--font-display); font-weight: var(--h-weight); line-height: 1.1; margin: 0 0 .4em; letter-spacing: var(--h-track); }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.2rem; }
p { max-width: var(--measure); margin: 0 0 1em; }
ul, ol { max-width: var(--measure); }
code, .mono { font-family: var(--font-mono); }
[hidden] { display: none !important; }
main:focus { outline: none; }

.wrap { max-width: 1240px; margin: 0 auto; padding: 0 var(--gutter); width: 100%; }
.label { font: 600 .76rem/1.3 var(--font-mono); letter-spacing: var(--label-track); text-transform: var(--label-case); color: var(--muted); }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.skip { position: absolute; left: -9999px; top: 8px; z-index: 100; background: var(--surface); color: var(--ink); padding: 10px 14px; border: 2px solid var(--line); border-radius: var(--r-sm); font: 600 .9rem var(--font-mono); }
.skip:focus { left: 16px; }

/* Marco con marcas de esquina */
.frame { position: relative; background: var(--surface); border: 1px solid var(--panel-border); border-radius: var(--r-lg); box-shadow: var(--shadow-1); }

/* Botones */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: 700 .95rem/1 var(--font-body); letter-spacing: 0; text-transform: var(--label-case); text-decoration: none;
  border: 1px solid var(--btn-border); background: var(--surface); color: var(--ink);
  padding: .8em 1.25em; cursor: pointer; min-height: 44px; border-radius: var(--r-btn);
  transition: background-color .15s, border-color .15s, box-shadow .2s, filter .15s;
}
.btn:hover { background: var(--surface-2); }
.btn-primary { background: var(--btn-primary-bg); color: var(--line-ink); border-color: transparent; box-shadow: var(--btn-primary-shadow); }
.btn-primary:hover { background: var(--btn-primary-bg); filter: brightness(1.08) saturate(1.1); }
.btn[aria-pressed="true"] { background: var(--btn-primary-bg); color: var(--line-ink); border-color: transparent; box-shadow: var(--btn-primary-shadow); }

/* Cabecera */
.site-head { background: var(--head-bg); border-bottom: 1px solid var(--panel-border); position: relative; z-index: 20; }
.head-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; padding-top: 10px; padding-bottom: 10px; }
.logo { display: flex; align-items: center; gap: 10px; font: var(--h-weight) 1.2rem/1 var(--font-display); text-transform: var(--label-case); letter-spacing: var(--h-track); color: var(--ink); text-decoration: none; margin-right: auto; }
.logo svg { flex: none; }
.main-nav { display: flex; flex-wrap: wrap; gap: 2px; order: 3; width: 100%; }
.main-nav a { color: var(--ink-2); text-decoration: none; font: 600 .92rem var(--font-body); letter-spacing: var(--label-track); text-transform: var(--label-case); padding: 12px 12px; min-height: 44px; display: inline-flex; align-items: center; border-radius: var(--r-btn); transition: background-color .15s, color .15s; }
.main-nav a:hover { background: var(--surface-2); color: var(--ink); }
.main-nav a[aria-current] { color: var(--line); background: color-mix(in srgb, var(--line) 12%, var(--surface)); font-weight: 700; }
.head-tools { display: flex; gap: 8px; align-items: center; }
.head-tools select { min-height: 44px; font: 600 .9rem var(--font-body); background: var(--surface); color: var(--ink); border: 1px solid var(--field-border); border-radius: var(--r-sm); padding: 0 10px; }
@media (max-width: 599px) {
  .main-nav a { padding: 10px 9px; font-size: .8rem; min-height: 44px; }
  .head-row { padding-top: 8px; padding-bottom: 0; }
  .search-form { padding: 8px 0 12px; }
  .search-form label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
}
@media (min-width: 900px) {
  .main-nav { order: 0; width: auto; margin-right: 8px; }
  .logo { margin-right: 0; }
  .head-row { flex-wrap: nowrap; }
  .main-nav { margin-left: auto; }
}

/* Búsqueda global */
.search-bar { background: var(--surface-2); border-bottom: 1px solid var(--panel-border); position: relative; z-index: 15; }
.search-form { display: flex; flex-wrap: wrap; gap: 0; padding: 12px 0; max-width: 720px; position: relative; }
.search-form label { flex-basis: 100%; margin-bottom: 6px; }
.search-form input { flex: 1 1 200px; min-width: 0; min-height: 48px; font: 500 1rem var(--font-body); padding: 0 16px; border: 1px solid var(--field-border); border-right: 0; background: var(--surface); color: var(--ink); border-radius: var(--r-btn) 0 0 var(--r-btn); }
.search-form .btn { border-radius: 0 var(--r-btn) var(--r-btn) 0; }
.search-panel {
  position: absolute; left: 0; right: 0; top: 100%; max-width: 720px; margin: 0;
  background: var(--surface); border: 1px solid var(--field-border); border-top: 0; border-radius: 0 0 var(--r-md) var(--r-md); max-height: 70vh; overflow: auto;
  box-shadow: var(--shadow-2);
}
.search-panel[hidden] { display: none; }

/* Contenido principal */
main { flex: 1 0 auto; padding-bottom: var(--space-6); }
.view { padding-top: var(--space-5); }
.crumbs { font: 500 .82rem/1.5 var(--font-body); color: var(--muted); margin: 0 0 12px; max-width: none; }
.crumbs a { color: inherit; }
.crumbs [aria-current] { color: var(--ink); }
.block-tag { display: inline-flex; gap: 10px; align-items: center; margin-bottom: 12px; font: 600 .78rem/1 var(--font-mono); letter-spacing: var(--label-track); text-transform: var(--label-case); color: var(--line); }
.block-tag::before { content: ""; width: 28px; height: 2px; border-radius: 2px; background: var(--line); }
.section-gap { margin-top: var(--space-6); }

/* Pie */
.site-foot { background: var(--head-bg); border-top: 1px solid var(--panel-border); padding: var(--space-5) 0; margin-top: var(--space-6); font-size: .95rem; }
.site-foot h2 { font: 700 .85rem var(--font-mono); letter-spacing: var(--label-track); margin-bottom: 8px; color: var(--alert); }
.site-foot .legal { max-width: var(--measure); }
.site-foot .legal-small { color: var(--muted); font: 500 .8rem var(--font-mono); margin: 12px 0 0; }

/* Vidrio de tablero: solo con soporte de backdrop-filter y en escritorio. Se apaga con
   prefers-reduced-transparency o prefers-reduced-data (bloque de apagado al final). En cualquier
   otro caso rigen las superficies sólidas de tokens.css (respaldo). */
@media (min-width: 768px) {
  body { background-image: var(--bg-art); background-attachment: fixed; }
  @supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
    .frame, .box:not(.safety), .steps, .spec, .related, .pager a, .sources, .diagram, .search-view .results-group {
      background: var(--glass); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur);
    }
    .site-head, .site-foot { background: var(--head-glass); -webkit-backdrop-filter: var(--glass-blur); backdrop-filter: var(--glass-blur); }
  }
}
@media (prefers-reduced-transparency: reduce), (prefers-reduced-data: reduce) {
  body { background-image: var(--bg-art-lite); background-attachment: scroll; }
  .frame, .box:not(.safety), .steps, .spec, .related, .pager a, .sources, .diagram, .search-view .results-group { background: var(--surface); -webkit-backdrop-filter: none; backdrop-filter: none; }
  .site-head, .site-foot { background: var(--head-bg); -webkit-backdrop-filter: none; backdrop-filter: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}
@media print { .site-head, .search-bar, .site-foot .btn { display: none; } body { background: #fff; } }