/* Máquina — portada de cada microlibro (índice generado desde la plantilla) */
body {
  min-height: 100vh; min-height: 100dvh;
  display: flex; flex-direction: column;
  padding: max(var(--gutter), env(safe-area-inset-top)) max(var(--gutter), env(safe-area-inset-right))
           max(var(--gutter), env(safe-area-inset-bottom)) max(var(--gutter), env(safe-area-inset-left));
  background: var(--papel);
}
.marco { width: 100%; max-width: 760px; margin: 0 auto; }

/* barra superior: idioma y tema */
.arriba { display: flex; align-items: center; justify-content: flex-end; gap: 12px; }
.controles { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
#tema { min-width: 44px; min-height: 44px; padding: 0; }
#tema svg { width: 18px; height: 18px; display: block; }

main { flex: 1; display: flex; flex-direction: column; justify-content: center; padding: 7vh 0 5vh; }
h1 { font-weight: 400; font-size: clamp(2.3rem, 8vw, 4rem); line-height: 1.08; margin: 0 0 1.1rem; letter-spacing: .01em; }
h1 .l { display: inline-block; }
.bajada { color: var(--tinta-suave); margin: 0 0 3.2rem; max-width: 50ch; }
.nota-traduccion { margin: -2.4rem 0 2.6rem; }
.nota-traduccion:empty { display: none; }
nav { display: grid; gap: 1.2rem; }
.via {
  display: grid; grid-template-columns: auto 1fr; gap: .2rem 1.2rem; align-items: baseline;
  padding: 1.1rem 1.2rem; text-decoration: none;
  border: 1px solid var(--linea); border-radius: 8px; background: var(--papel);
  box-shadow: 0 2px 0 var(--linea);
  transition: transform .08s ease, box-shadow .08s ease, border-color .2s;
}
.via:hover { border-color: var(--tinta); color: var(--tinta); }
.via:active { transform: translateY(2px); box-shadow: 0 0 0 var(--linea); }
.via:focus-visible { outline: 2px solid var(--cinta); outline-offset: 3px; }
.via b { font-weight: 400; font-size: 1.45rem; }
.via b::before { content: "[ "; color: var(--tinta-tenue); }
.via b::after { content: " ]"; color: var(--tinta-tenue); }
.via:hover b { color: var(--cinta); }
.via span { color: var(--tinta-suave); font-size: .95rem; }

/* eco: frases del libro; cada una lleva a su hoja en el original */
.eco { display: block; min-height: 3.4em; margin: 3.2rem 0 0; color: var(--tinta-tenue); font-size: .95rem; text-decoration: none; border-radius: 4px; }
.eco[href]:hover { color: var(--tinta); }
.eco[href]:hover .donde { text-decoration: underline 1px var(--cinta); text-underline-offset: 4px; }
.eco:focus-visible { outline: 2px solid var(--cinta); outline-offset: 4px; }
.eco .donde { opacity: .75; white-space: nowrap; }
.eco .cursor { display: inline-block; width: .6em; border-bottom: 2px solid var(--cinta); animation: parpadeo 1s steps(1) infinite; }
@keyframes parpadeo { 50% { opacity: 0; } }

.descargas { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem 1.4rem; margin: 2.4rem 0 0; }
.descargas .tecla { min-height: 44px; padding: 0 1em; text-decoration: none; }
.descargas .tecla:hover { color: var(--cinta); }
#md { display: inline-block; padding: 10px 0; }

/* pie: obra de + firma */
footer { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1rem; color: var(--tinta-tenue); font-size: .85rem; padding-bottom: 4px; }
.autor { display: inline-flex; align-items: center; gap: .6rem; color: var(--tinta-suave); text-decoration: none; border-radius: 4px; padding: 12px 0; }
.autor img { height: 22px; width: auto; display: block; opacity: .88; transition: opacity .2s; }
.autor:hover img { opacity: 1; }
.autor:focus-visible { outline: 2px solid var(--cinta); outline-offset: 4px; }
:root[data-theme="dark"] .autor img { filter: invert(1); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .autor img { filter: invert(1); } }

@media (max-width: 560px) {
  .via { grid-template-columns: 1fr; }
  .autor img { height: 18px; }
}

/* ---------- intro (≈3.5 s): el título se teclea y todo cae en su lugar ---------- */
#saltar { display: none; }
html.intro .aparece { opacity: 0; }
html.intro.corre .aparece { animation: cae .7s cubic-bezier(.2, .7, .2, 1) forwards; animation-delay: var(--d, 0s); }
@keyframes cae { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
html.intro.corre nav .via { animation-name: rodillo; }
@keyframes rodillo { from { opacity: 0; transform: translateY(26px); clip-path: inset(0 0 100% 0); } to { opacity: 1; transform: none; clip-path: inset(0 0 0 0); } }
html.intro #saltar {
  display: block; position: fixed; z-index: 21; right: max(16px, env(safe-area-inset-right)); bottom: max(16px, env(safe-area-inset-bottom));
  background: none; border: 0; cursor: pointer; font-family: var(--mono); font-size: 14px; color: var(--tinta-tenue); padding: 10px;
}
html.intro #saltar:hover { color: var(--tinta); }

/* vuelta a la home de la app */
.a-app { margin-right: auto; color: var(--tinta-tenue); font-size: .9rem; text-decoration: none; padding: 10px 0; border-radius: 4px; }
.a-app:hover { color: var(--cinta); }
.a-app:focus-visible { outline: 2px solid var(--cinta); outline-offset: 3px; }