/* Newsreader — SIL Open Font License 1.1 (ver fonts/OFL.txt). Autoalojada. */
@font-face {
  font-family: "Newsreader";
  src: url("fonts/Newsreader-opsz.woff2") format("woff2");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Newsreader";
  src: url("fonts/Newsreader-opsz-italic.woff2") format("woff2");
  font-weight: 200 800;
  font-style: italic;
  font-display: swap;
}

:root {
  --papel: #f1f0eb;
  --tinta: #14213d;
  --suave: #475169;        /* texto secundario, AA sobre el papel */
  --lapiz: #2f6b4f;        /* verde de lápiz (AA como texto) */
  --linea: rgba(20, 33, 61, 0.22);
  --grano: 0.1;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --papel: #0e1218;
    --tinta: #e8ecf4;
    --suave: #a3aec4;
    --lapiz: #7fc29b;
    --linea: rgba(232, 236, 244, 0.22);
    --grano: 0.04;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; background: var(--papel); scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--papel);
  color: var(--tinta);
  font-family: "Newsreader", "Iowan Old Style", "Charter", Georgia, serif;
  font-optical-sizing: auto;
  font-size: 1.125rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: var(--grano);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

main {
  position: relative;
  max-width: 78rem;
  margin: 0 auto;
  padding: 0 max(1.25rem, env(safe-area-inset-right)) 3rem max(1.25rem, env(safe-area-inset-left));
}
@media (min-width: 48rem) { main { padding-inline: clamp(2rem, 5vw, 4.5rem); } }
/* margen de cuaderno: una línea fina de lápiz a la izquierda */
main::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  left: 0.55rem;
  width: 1px;
  background: var(--lapiz);
  opacity: 0.35;
  pointer-events: none;
}
@media (min-width: 48rem) { main::before { left: clamp(0.75rem, 2.5vw, 2.25rem); } }

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--tinta);
  outline-offset: 4px;
  border-radius: 2px;
}

/* ───────── Portada ───────── */
.hero {
  display: flex;
  flex-direction: column;
  padding: max(2.5rem, env(safe-area-inset-top)) 0 0.25rem;
}
h1 {
  margin: 0 0 -0.06em;
  font-weight: 300;
  line-height: 0.8;
  letter-spacing: -0.035em;
  font-size: clamp(5rem, 32vw, 24rem);
  white-space: nowrap;
}
.letras { display: block; overflow: hidden; padding: 0.12em 0.06em 0.06em; margin-left: -0.04em; }
.l {
  display: inline-block;
  font-variation-settings: "wght" 300;
  will-change: font-variation-settings;
  transform: translateY(105%);
  animation: letra 1.2s var(--ease) forwards;
  animation-delay: calc(0.15s + var(--i, 0) * 0.09s);
}
.l:nth-child(1) { --i: 0 } .l:nth-child(2) { --i: 1 } .l:nth-child(3) { --i: 2 }
.l:nth-child(4) { --i: 3 } .l:nth-child(5) { --i: 4 }

.lede {
  margin: 0.6rem 0 0;
  max-width: 34rem;
  font-size: clamp(1.0625rem, 3.2vw, 1.75rem);
  font-style: italic;
  line-height: 1.4;
  opacity: 0;
  animation: sube 1.1s var(--ease) 0.9s forwards;
}
@keyframes letra { to { transform: none; } }
@keyframes sube { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* ───────── Índice ───────── */
.indice { padding-top: 1.25rem; }
.rotulo {
  display: flex;
  justify-content: space-between;
  margin: 0 0 0.4rem;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--suave);
}
.indice ol { list-style: none; margin: 0; padding: 0; border-bottom: 1px solid var(--linea); }
.cap { border-top: 1px solid var(--linea); }
.cap h2 { margin: 0; font: inherit; }

.fila {
  width: 100%;
  display: grid;
  grid-template-columns: 1.7rem 1fr auto 0.9rem;
  grid-template-areas: "num t plat mas";
  align-items: baseline;
  column-gap: 0.4rem;
  padding: 0.8rem 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: opacity 0.4s var(--ease);
}
.num { grid-area: num; font-size: 0.8125rem; font-style: italic; color: var(--suave); font-feature-settings: "onum"; }
.t {
  grid-area: t;
  position: relative;
  justify-self: start;
  font-size: clamp(1.3rem, 5.5vw, 5.25rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.02em;
  transition: transform 0.5s var(--ease), font-weight 0.5s var(--ease), color 0.4s;
}
.plat { grid-area: plat; font-size: 0.8125rem; font-style: italic; color: var(--suave); }
.mas { grid-area: mas; position: relative; width: 0.9rem; height: 0.9rem; align-self: center; }
.mas::before, .mas::after { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 1.5px; background: currentColor; transition: transform 0.5s var(--ease); }
.mas::after { transform: rotate(90deg); }
.cap.open .mas::after { transform: rotate(0deg); }

@media (min-width: 48rem) {
  .hero { padding: 5rem 0 3rem; }
  h1 { font-size: clamp(6.5rem, 30vw, 24rem); }
  .lede { margin-top: 1.1rem; font-size: clamp(1.25rem, 2vw, 1.75rem); max-width: 36rem; }
  .indice { padding-top: 2rem; }
  .rotulo { margin-bottom: 1rem; font-size: 0.8125rem; letter-spacing: 0.22em; }
  .fila { grid-template-columns: 4.5rem 1fr auto 3rem; column-gap: 0.5rem; padding: clamp(1.1rem, 2.4vw, 2rem) 0; }
  .num { font-size: 0.9375rem; }
  .plat { font-size: 1.125rem; }
  .mas { width: 1.25rem; height: 1.25rem; }
  .t { font-size: clamp(2.6rem, 4.9vw, 4.75rem); white-space: nowrap; }
}

/* trazo a mano alzada: se dibuja al pasar / al abrir */
.trazo {
  position: absolute;
  left: -0.04em; bottom: -0.1em;
  width: calc(100% + 0.08em);
  height: 0.2em;
  overflow: visible;
  pointer-events: none;
}
.trazo path {
  fill: none;
  stroke: var(--lapiz);
  stroke-width: 3;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 0.8s var(--ease);
}
.cap.open .trazo path { stroke-dashoffset: 0; }
.cap.open .t { color: var(--lapiz); font-weight: 400; }

@media (hover: hover) {
  .fila:hover .trazo path { stroke-dashoffset: 0; }
  .fila:hover .t { transform: translateX(0.5rem); font-weight: 400; }
  .indice:has(.fila:hover) .cap:not(:has(.fila:hover)) .fila { opacity: 0.4; }
}
.fila:focus-visible .trazo path { stroke-dashoffset: 0; }

/* panel desplegable */
.panel { display: grid; grid-template-rows: 1fr; }
.panel > .in { min-height: 0; overflow: hidden; }
.js .panel {
  grid-template-rows: 0fr;
  visibility: hidden;
  transition: grid-template-rows 0.7s var(--ease), visibility 0s linear 0.7s;
}
.js .cap.open .panel { grid-template-rows: 1fr; visibility: visible; transition-delay: 0s; }

.cuerpo { display: grid; gap: 1.25rem; padding: 0.1rem 0 1.5rem; }
@media (min-width: 48rem) {
  .cuerpo { grid-template-columns: 1fr 1fr; gap: 4rem; padding-bottom: 2.75rem; padding-left: 4.5rem; padding-right: 3rem; align-items: start; }
}
.texto { margin: 0 0 0.6rem; max-width: 30rem; font-size: clamp(1.0625rem, 3vw, 1.5rem); line-height: 1.5; }
.ir {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.5rem 0;
  color: var(--tinta);
  font-size: 1.0625rem;
  font-style: italic;
  text-decoration: none;
}
.ir::after { content: ""; width: 2.25rem; height: 1px; background: var(--lapiz); transition: width 0.6s var(--ease); }
.ir:hover::after, .ir:focus-visible::after { width: 4.5rem; }
.lista { list-style: none; margin: 0; padding: 0; font-size: clamp(1.1rem, 3.4vw, 2rem); font-style: italic; line-height: 1.5; color: var(--suave); }
.lista li { padding: 0.15rem 0; border-bottom: 1px solid var(--linea); }
.lista li:first-child { border-top: 1px solid var(--linea); }
.nota { margin: 0; font-size: clamp(1.0625rem, 3.2vw, 1.5rem); font-style: italic; line-height: 1.45; color: var(--suave); }
.gracias { margin: 0; font-size: clamp(2.2rem, 9vw, 6rem); font-style: italic; font-weight: 300; color: var(--lapiz); line-height: 1; }

/* poema: filas de chino y español, de izquierda a derecha, compacto */
.muestra { margin: 0; font-size: 0.9375rem; line-height: 1.5; }
.par { margin-bottom: 0.45rem; }
.lin { display: grid; grid-template-columns: 5.6em 1fr; column-gap: 0.9rem; align-items: baseline; }
.zh { font-family: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif; font-size: 1em; letter-spacing: 0.08em; color: var(--tinta); white-space: nowrap; }
.es { font-style: italic; color: var(--suave); }
@media (min-width: 48rem) { .muestra { font-size: 1.0625rem; } }

/* los hijos entran escalonados al abrir */
.js .r { opacity: 0; transform: translateY(16px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.js .cap.open .r { opacity: 1; transform: none; transition-delay: calc(0.2s + var(--k, 0) * 0.1s); }
.cuerpo > :nth-child(2), .cuerpo .col > :nth-child(2) { --k: 1; }
.cuerpo > :nth-child(2) { --k: 2; }
.js .lin { opacity: 0; transition: opacity 0.9s var(--ease); }
.js .cap.open .lin { opacity: 1; transition-delay: calc(0.4s + var(--k, 0) * 0.2s); }

/* ───────── Ventana de traducción (capítulo V) ───────── */
dialog {
  width: min(32rem, calc(100vw - 2rem));
  max-height: calc(100dvh - 2rem);
  padding: 0;
  border: 1px solid var(--linea);
  border-radius: 2px;
  background: var(--papel);
  color: var(--tinta);
  overflow: auto;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease), overlay 0.45s allow-discrete, display 0.45s allow-discrete;
}
dialog[open] { opacity: 1; transform: none; }
@starting-style { dialog[open] { opacity: 0; transform: translateY(14px); } }
dialog::backdrop {
  background: rgba(241, 240, 235, 0.86);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity 0.45s var(--ease), overlay 0.45s allow-discrete, display 0.45s allow-discrete;
}
dialog[open]::backdrop { opacity: 1; }
@starting-style { dialog[open]::backdrop { opacity: 0; } }
@media (prefers-color-scheme: dark) { dialog::backdrop { background: rgba(14, 18, 24, 0.86); } }
body:has(dialog[open]) { overflow: hidden; }

.hoja { position: relative; padding: 2.5rem 1.75rem 2rem; }
@media (min-width: 40rem) { .hoja { padding: 3rem 2.75rem 2.5rem; } }
.hoja h2 { margin: 0 0 1.75rem; font-size: clamp(1.9rem, 6vw, 2.5rem); font-style: italic; font-weight: 300; line-height: 1.1; letter-spacing: -0.02em; }

.cierra { position: absolute; top: 0.9rem; right: 0.9rem; width: 2.75rem; height: 2.75rem; border: 0; background: none; color: var(--suave); cursor: pointer; }
.cierra span, .cierra span::before { position: absolute; left: 50%; top: 50%; width: 1.1rem; height: 1.5px; background: currentColor; content: ""; }
.cierra span { transform: translate(-50%, -50%) rotate(45deg); }
.cierra span::before { left: 0; top: 0; transform: rotate(90deg); }
.cierra:hover { color: var(--tinta); }

.campo { margin-bottom: 1.6rem; }
.campo label { display: block; font-size: 0.8125rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--suave); }
.campo input, .campo textarea {
  width: 100%;
  padding: 0.5rem 0 0.6rem;
  border: 0;
  border-bottom: 1.5px solid var(--linea);
  border-radius: 0;
  background: transparent;
  color: var(--tinta);
  font: inherit;
  font-size: 1.25rem;        /* ≥16px: evita el zoom de iOS */
  appearance: none;
  -webkit-appearance: none;
  resize: none;
  transition: border-color 0.3s;
}
.campo input::placeholder, .campo textarea::placeholder { color: var(--suave); opacity: 0.7; font-style: italic; }
.campo input:focus, .campo textarea:focus { outline: none; border-bottom-color: var(--lapiz); box-shadow: 0 1.5px 0 0 var(--lapiz); }
.campo [aria-invalid="true"] { border-bottom-color: #b3402f; }
@media (prefers-color-scheme: dark) { .campo [aria-invalid="true"] { border-bottom-color: #ff8f7a; } }

.turnstile:not(:empty) { margin: 0 0 1rem; }
.trampa { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.enviar {
  margin-top: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.6rem;
  border: 0;
  background: var(--tinta);
  color: var(--papel);
  font: inherit;
  font-size: 1.2rem;
  font-style: italic;
  cursor: pointer;
  transition: background 0.3s;
}
.enviar i { font-style: normal; transition: transform 0.4s var(--ease); }
.enviar:hover { background: var(--lapiz); }
.enviar:hover i { transform: translateX(0.35rem); }
.enviar:disabled { opacity: 0.6; cursor: progress; }
.enviar:focus-visible { outline-color: var(--lapiz); }

.estado { min-height: 1.6em; margin: 1.1rem 0 0; font-style: italic; color: var(--suave); }
.estado.ok { color: var(--lapiz); font-size: 1.4rem; }
.estado.mal { color: #b3402f; }
@media (prefers-color-scheme: dark) { .estado.mal { color: #ff8f7a; } }

/* en el móvil la ventana sube desde abajo, como una hoja */
@media (max-width: 40rem) {
  dialog { width: 100%; max-width: 100%; margin: auto 0 0; border-width: 1px 0 0; padding-bottom: env(safe-area-inset-bottom); transform: translateY(40px); }
  dialog[open] { transform: none; }
  @starting-style { dialog[open] { transform: translateY(40px); } }
}

.pie { padding-top: 5rem; }
.pie p { margin: 0; font-size: 0.9375rem; color: var(--suave); }

/* entrada al hacer scroll */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.9s var(--ease), transform 0.9s var(--ease); }
.js .reveal.visto { opacity: 1; transform: none; }

/* ───────── Movimiento reducido ───────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .lede { animation: none; opacity: 1; }
  .l { animation: none; transform: none; }
  .js .panel, .panel, .js .r, .js .reveal, .js .lin, .t, .trazo path, .mas::before, .mas::after, dialog, dialog::backdrop { transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}

@media (min-width: 48rem) { .hero { padding-top: 5rem; padding-bottom: 3rem; } }