/* Atardecer romántico en tonos claros: lavanda, rosa y durazno. */
:root {
  --color_sky_top: #c3b2f3;
  --color_sky_middle: #f2b5d4;
  --color_sky_bottom: #ffd9c9;
  --color_glass: rgba(255, 255, 255, 0.88);
  --color_glass_edge: rgba(255, 255, 255, 0.85);
  --color_text: #36264a;
  --color_text_muted: #5b4a70;
  --color_pink: #c2437f;
  --color_pink_light: #ff7eb3;
  --color_violet: #6f55c9;
  --color_violet_soft: rgba(111, 85, 201, 0.14);
  --color_gold: #ffd36e;
  --color_error: #a8201a;
  --color_error_soft: rgba(255, 255, 255, 0.85);
  --color_focus: #ff8a00;
  --radius: 24px;
  --font_title: "Lora", Georgia, "Times New Roman", serif;
  --font_ui: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* El atributo hidden siempre gana, aunque otra regla defina display */
[hidden] {
  display: none !important;
}

body {
  font-family: var(--font_ui);
  color: var(--color_text);
  line-height: 1.5;
  min-height: 100vh;
  min-height: 100dvh;
  background:
    radial-gradient(circle at 18% 12%, rgba(255, 255, 255, 0.6), transparent 38%),
    radial-gradient(circle at 86% 82%, rgba(255, 190, 215, 0.7), transparent 46%),
    linear-gradient(180deg, var(--color_sky_top) 0%, var(--color_sky_middle) 55%, var(--color_sky_bottom) 100%);
}

/* Lienzo 3D de fondo: decorativo, nunca recibe toques */
#scene_canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.skip_link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 20;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--color_violet);
  color: #ffffff;
  text-decoration: none;
}

.skip_link:focus {
  top: 16px;
}

main {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  min-height: 100dvh;
  /* Los destellos pueden asomar fuera de la tarjeta; esto evita desplazamiento horizontal */
  overflow-x: clip;
}

/* Nada puede asomar fuera de la pantalla y alargar la página: los destellos quedan dentro del margen. */
.screen:not(.reader_screen) {
  overflow: clip;
}

.screen {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  /* Margen lateral de 16px y espacio arriba y abajo para los destellos */
  padding: 56px 16px;
}

/* Tarjeta con borde luminoso. Sin desenfoque de fondo: con el cielo animado detrás era demasiado costoso. */
.card {
  position: relative;
  width: 100%;
  max-width: 440px;
  padding: 28px 24px 32px;
  text-align: center;
  background: var(--color_glass);
  border: 1px solid var(--color_glass_edge);
  border-radius: var(--radius);
  box-shadow:
    0 0 38px rgba(255, 126, 179, 0.38),
    0 0 90px rgba(143, 123, 217, 0.3),
    0 18px 40px rgba(80, 50, 120, 0.18);
  animation: card_enter 0.8s cubic-bezier(0.2, 0.9, 0.3, 1) both;
}

.card::before {
  content: "";
  position: absolute;
  inset: -2px;
  padding: 2px;
  border-radius: calc(var(--radius) + 2px);
  background: conic-gradient(from 30deg, #ff7eb3, #b49cff, #ffd98a, #ff7eb3);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  pointer-events: none;
}

@keyframes card_enter {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.96);
  }
}

/* Destellos alrededor de la tarjeta: aparecen, brillan y desaparecen */
.sparkle_layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.sparkle {
  position: absolute;
  left: var(--x);
  top: var(--y);
  font-size: var(--size);
  color: var(--color_gold);
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.2) rotate(0deg);
  text-shadow: 0 0 6px rgba(255, 255, 255, 0.95);
  animation: sparkle_twinkle var(--duration) ease-in-out var(--delay) infinite;
}

.sparkle_heart {
  color: #ff6f9f;
}

@keyframes sparkle_twinkle {
  0%,
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.2) rotate(0deg);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1) rotate(45deg);
  }
}

/* Emblema: corazón o rosa dentro de órbitas con puntos que giran */
.emblem {
  width: 132px;
  height: 132px;
  margin: -4px auto 4px;
}

.emblem {
  position: relative;
}

/* Resplandor fijo detrás del emblema */
.emblem::before {
  content: "";
  position: absolute;
  inset: 14%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 110, 165, 0.4), transparent 70%);
}

.emblem svg {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.orbit {
  fill: none;
  stroke: rgba(111, 85, 201, 0.4);
  stroke-width: 1;
  stroke-dasharray: 3 6;
  transform-origin: 60px 60px;
}

.orbit_outer {
  animation: spin 26s linear infinite;
}

.orbit_inner {
  stroke: rgba(194, 67, 127, 0.45);
  animation: spin 18s linear infinite reverse;
}

.orbit_spin {
  transform-origin: 60px 60px;
  animation: spin 9s linear infinite;
}

.orbit_spin_reverse {
  animation-duration: 13s;
  animation-direction: reverse;
}

.orbit_dot {
  fill: var(--color_gold);
}

.orbit_dot_small {
  fill: #ffffff;
}

.orbit_dot_pink {
  fill: var(--color_pink_light);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.heart_shape {
  transform-origin: 60px 58px;
  animation: heartbeat 1.7s ease-in-out infinite;
}

.heart_shine {
  fill: none;
  stroke: rgba(255, 255, 255, 0.85);
  stroke-width: 3;
  stroke-linecap: round;
  transform-origin: 60px 58px;
  animation: heartbeat 1.7s ease-in-out infinite;
}

@keyframes heartbeat {
  0%,
  100% {
    transform: scale(1);
  }
  14% {
    transform: scale(1.14);
  }
  28% {
    transform: scale(1);
  }
  42% {
    transform: scale(1.1);
  }
  56% {
    transform: scale(1);
  }
}

/* Títulos */
.book_title,
.screen_title {
  font-family: var(--font_title);
  font-weight: 700;
  outline: none;
  color: var(--color_text);
}

.book_title {
  font-size: clamp(2rem, 8vw, 2.6rem);
  line-height: 1.15;
  background: linear-gradient(90deg, var(--color_pink), var(--color_violet), var(--color_pink));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.screen_title {
  font-size: 1.7rem;
}

.divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 8px;
  color: var(--color_gold);
  font-size: 0.7rem;
  filter: drop-shadow(0 0 4px rgba(255, 180, 60, 0.7));
}

.divider .fa-heart {
  color: var(--color_pink_light);
  font-size: 0.9rem;
}

.screen_hint {
  margin: 12px 0 24px;
  color: var(--color_text_muted);
}

.loading_block {
  display: grid;
  justify-items: center;
  gap: 4px;
}

.loading_heart {
  width: 96px;
  height: 96px;
}

.loading_text {
  color: var(--color_text);
  font-family: var(--font_title);
  font-size: 1.2rem;
}

/* Formulario */
form {
  text-align: left;
}

.field {
  margin-bottom: 18px;
}

label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.95rem;
  font-weight: 600;
}

input {
  width: 100%;
  min-height: 48px;
  padding: 10px 14px;
  font: inherit;
  /* 16px evita que iOS haga zoom al enfocar el campo */
  font-size: 1rem;
  color: var(--color_text);
  background: rgba(255, 255, 255, 0.8);
  border: 1.5px solid rgba(111, 85, 201, 0.25);
  border-radius: 14px;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  background: rgba(255, 255, 255, 0.45);
}

input:focus-visible {
  outline: 3px solid var(--color_focus);
  outline-offset: 1px;
  border-color: var(--color_pink_light);
  box-shadow: 0 0 18px rgba(255, 126, 179, 0.55);
}

.password_row {
  display: flex;
  gap: 8px;
}

.form_error {
  margin-bottom: 16px;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color_error);
  background: var(--color_error_soft);
  border-left: 4px solid var(--color_error);
  border-radius: 10px;
}

/* Botones: área de toque mínima de 48px */
.button,
.icon_button {
  min-height: 48px;
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 14px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.15s ease, box-shadow 0.25s ease;
}

.button {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 12px 20px;
}

.button:disabled {
  opacity: 0.7;
  cursor: progress;
}

.button_primary {
  color: #ffffff;
  background: linear-gradient(110deg, #c2437f 0%, #8a4fc4 60%, #6f55c9 100%);
  box-shadow: 0 6px 20px rgba(194, 67, 127, 0.4);
}

/* Brillo que cruza el botón al pasar el cursor o enfocarlo */
.button_primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -60%;
  width: 40%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.55), transparent);
  transform: skewX(-20deg);
  transition: left 0.7s ease;
  pointer-events: none;
}

.button_primary:hover:not(:disabled)::after,
.button_primary:focus-visible::after {
  left: 130%;
}

.button_primary:hover:not(:disabled) {
  box-shadow: 0 8px 28px rgba(255, 90, 150, 0.6);
  transform: translateY(-1px);
}

.button_secondary {
  color: var(--color_violet);
  background: rgba(255, 255, 255, 0.7);
  border: 1.5px solid rgba(111, 85, 201, 0.3);
}

.button_secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.95);
}

.button_link {
  margin-top: 8px;
  color: var(--color_text_muted);
  background: transparent;
  font-weight: 500;
}

.button_link:hover {
  color: var(--color_text);
}

.icon_button {
  flex: 0 0 48px;
  width: 48px;
  color: var(--color_violet);
  background: rgba(255, 255, 255, 0.7);
  border: 1.5px solid rgba(111, 85, 201, 0.25);
}

.icon_button:hover {
  background: rgba(255, 255, 255, 0.95);
}

.button:focus-visible,
.icon_button:focus-visible {
  outline: 3px solid var(--color_focus);
  outline-offset: 2px;
}

.button:active:not(:disabled) {
  transform: translateY(1px);
}

/* Menú principal */
.menu {
  display: grid;
  gap: 12px;
  margin-bottom: 16px;
}

/* Tarjetas anchas para escribir y leer listas */
.card_wide {
  max-width: 640px;
}

.card_wide .screen_title {
  margin-bottom: 4px;
}

textarea {
  display: block;
  width: 100%;
  min-height: 240px;
  padding: 14px;
  font-family: var(--font_title);
  /* 16px como mínimo evita el zoom automático de iOS */
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color_text);
  background: rgba(255, 255, 255, 0.85);
  border: 1.5px solid rgba(111, 85, 201, 0.25);
  border-radius: 14px;
  resize: vertical;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

textarea:focus-visible {
  outline: 3px solid var(--color_focus);
  outline-offset: 1px;
  border-color: var(--color_pink_light);
  box-shadow: 0 0 18px rgba(255, 126, 179, 0.55);
}

textarea::placeholder {
  color: #85739a;
  font-style: italic;
}

.form_success {
  margin-bottom: 16px;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #1d6b43;
  background: rgba(255, 255, 255, 0.85);
  border-left: 4px solid #2f9e66;
  border-radius: 10px;
}

form .button + .button {
  margin-top: 10px;
}

/* Celebración Lottie al guardar: capa centrada sobre la pantalla, no empuja el formulario */
.celebration {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.celebration_wide lottie-player {
  width: 100%;
  height: 100%;
  filter: none;
}

.celebration lottie-player {
  width: min(70vw, 260px);
  height: min(70vw, 260px);
  filter: drop-shadow(0 0 18px rgba(255, 126, 179, 0.7));
}

/* Filtros de la lista */
.list_status {
  min-height: 1.5em;
  margin-bottom: 12px;
  font-size: 0.95rem;
  color: var(--color_text_muted);
}

/* Paginación de la lista */
.pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 12px 0;
}

.pager .button_small {
  flex: 0 0 auto;
}

.pager .button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.pager_text {
  flex: 1;
  min-width: 0;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  color: var(--color_text);
}

/* Lista de páginas */
.item_list {
  list-style: none;
  display: grid;
  gap: 14px;
  margin-bottom: 20px;
  text-align: left;
}

.list_item {
  padding: 16px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(111, 85, 201, 0.18);
  border-radius: 16px;
  box-shadow: 0 4px 14px rgba(80, 50, 120, 0.08);
}

.list_item_meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin-bottom: 10px;
  font-size: 0.88rem;
}

.list_item_date {
  font-weight: 700;
  color: var(--color_text);
}

.list_item_author::before {
  content: "·";
  margin-right: 10px;
}

.list_item_author {
  color: var(--color_text_muted);
}

.list_item_title {
  flex-basis: 100%;
  font-family: var(--font_title);
  font-style: italic;
  color: var(--color_text_muted);
}

.list_item_content {
  font-family: var(--font_title);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color_text);
  /* Conserva saltos de línea y espacios tal como se escribieron */
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.list_item_content.is_clamped {
  display: -webkit-box;
  -webkit-line-clamp: 6;
  line-clamp: 6;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.list_item_actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.button_small {
  width: auto;
  min-height: 44px;
  padding: 8px 14px;
  font-size: 0.9rem;
}

.button_danger_soft {
  color: #a8201a;
  border-color: rgba(168, 32, 26, 0.35);
}

.button_danger {
  color: #ffffff;
  background: #b3261e;
}

.button_danger:hover:not(:disabled) {
  background: #8f1d17;
}

/* Diálogo de confirmación */
dialog {
  width: min(92vw, 400px);
  margin: auto;
  padding: 24px;
  color: var(--color_text);
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--color_glass_edge);
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(54, 38, 74, 0.4);
}

dialog::backdrop {
  background: rgba(54, 38, 74, 0.5);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.dialog_title {
  font-family: var(--font_title);
  font-size: 1.35rem;
  margin-bottom: 8px;
}

.dialog_text {
  margin-bottom: 20px;
  color: var(--color_text_muted);
  overflow-wrap: anywhere;
}

.dialog_actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

/* Paneles desplegables de la pantalla de páginas */
.panel {
  margin-bottom: 12px;
  text-align: left;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(111, 85, 201, 0.22);
  border-radius: 16px;
}

.panel > summary,
.paste_box > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 52px;
  padding: 12px 16px;
  font-weight: 700;
  color: var(--color_text);
  cursor: pointer;
  list-style: none;
  border-radius: 16px;
}

.panel > summary::-webkit-details-marker,
.paste_box > summary::-webkit-details-marker {
  display: none;
}

/* Flecha que gira al abrir */
.panel > summary::after,
.paste_box > summary::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-right: 4px;
  border-right: 2.5px solid var(--color_violet);
  border-bottom: 2.5px solid var(--color_violet);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.panel[open] > summary::after,
.paste_box[open] > summary::after {
  transform: rotate(-135deg);
}

.panel > summary:focus-visible,
.paste_box > summary:focus-visible {
  outline: 3px solid var(--color_focus);
  outline-offset: 2px;
}

.panel_body {
  padding: 4px 16px 18px;
}

.panel_text {
  margin-bottom: 14px;
  font-size: 0.95rem;
  color: var(--color_text_muted);
}

.panel_body .button + .button {
  margin-top: 10px;
}

.paste_box {
  margin-bottom: 14px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px dashed rgba(111, 85, 201, 0.35);
  border-radius: 12px;
}

.paste_box > summary {
  min-height: 44px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color_violet);
}

.code_area {
  min-height: 120px;
  margin: 0 12px 12px;
  width: calc(100% - 24px);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  line-height: 1.5;
}

/* Selector de archivo y casillas: sobrescriben el estilo general de input */
input[type="file"] {
  padding: 10px;
  font-size: 0.95rem;
  cursor: pointer;
}

input[type="file"]::file-selector-button {
  min-height: 36px;
  margin-right: 12px;
  padding: 6px 14px;
  font: inherit;
  font-weight: 600;
  color: var(--color_violet);
  background: rgba(255, 255, 255, 0.95);
  border: 1.5px solid rgba(111, 85, 201, 0.35);
  border-radius: 10px;
  cursor: pointer;
}

input[type="checkbox"] {
  flex: 0 0 auto;
  width: 24px;
  min-height: 24px;
  height: 24px;
  margin-top: 2px;
  padding: 0;
  accent-color: var(--color_pink);
  cursor: pointer;
}

.visually_hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.error_heading {
  margin-bottom: 6px;
}

.error_list {
  margin-left: 20px;
  font-weight: 500;
}

.error_list li + li {
  margin-top: 4px;
}

/* Vista previa de la importación */
.import_preview {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(111, 85, 201, 0.2);
}

.import_summary {
  margin-bottom: 12px;
  font-weight: 600;
  color: var(--color_text);
}

.import_list {
  list-style: none;
  display: grid;
  gap: 8px;
  max-height: 320px;
  margin-bottom: 14px;
  padding-right: 4px;
  overflow-y: auto;
}

.import_item {
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(111, 85, 201, 0.18);
  border-radius: 12px;
  font-size: 0.92rem;
}

.import_item.is_duplicate {
  opacity: 0.6;
}

.import_item_title {
  margin-bottom: 4px;
}

.import_item_flag {
  font-weight: 600;
  color: #7a4a00;
}

.import_item_text {
  font-family: var(--font_title);
  color: var(--color_text_muted);
  overflow-wrap: anywhere;
}

/* Fechas opcionales: una fecha o un periodo */
.date_group {
  margin-bottom: 18px;
}

.date_row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 12px;
}

.date_row .field {
  margin-bottom: 8px;
}

.field_hint {
  margin-bottom: 10px;
  font-size: 0.88rem;
  color: var(--color_text_muted);
}

@media (max-width: 480px) {
  .date_row {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------------
   Lectura del libro
   --------------------------------------------------------------------------- */
.reader_screen {
  place-items: start center;
  padding: 20px 12px 32px;
}

/* Medidas de las páginas. Primero se calculan con vh y, si el navegador lo soporta, con dvh. */
.reader {
  --pages_visible: 1;
  --page_w: min(calc(100vw - 40px), 460px);
  --page_h: max(380px, min(calc(100vh - 250px), calc(var(--page_w) * 1.65)));
  --page_h: max(380px, min(calc(100dvh - 250px), calc(var(--page_w) * 1.65)));
  --paper: #fffdf8;
  --paper_shade: #eadfc9;

  position: relative;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

@media (min-width: 900px) {
  .reader {
    --pages_visible: 2;
    --page_w: min(calc((100vw - 110px) / 2), 520px);
    --page_h: max(420px, min(calc(100vh - 260px), calc(var(--page_w) * 1.4)));
    --page_h: max(420px, min(calc(100dvh - 260px), calc(var(--page_w) * 1.4)));
  }
}

.reader_top {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
}

.reader_title {
  flex: 1;
  font-family: var(--font_title);
  font-size: 1.35rem;
  color: var(--color_text);
  text-shadow: 0 1px 10px rgba(255, 255, 255, 0.8);
  outline: none;
}

.reader_status {
  min-height: 1.5em;
  padding: 8px 16px;
  font-weight: 600;
  color: var(--color_text);
  background: rgba(255, 255, 255, 0.7);
  border-radius: 12px;
}

.reader_status:empty {
  display: none;
}

.book_viewport {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

/* El libro: dos páginas (o una) sobre una tapa de color */
.book {
  position: relative;
  isolation: isolate;
  width: calc(var(--page_w) * var(--pages_visible));
  height: var(--page_h);
  margin: 12px 0;
  touch-action: pan-y;
}

.book::before {
  content: "";
  position: absolute;
  inset: -12px -14px;
  z-index: -1;
  border-radius: 16px;
  background: linear-gradient(135deg, #d98ab4 0%, #a98be0 100%);
  border: 2px solid rgba(255, 220, 140, 0.85);
  box-shadow: 0 24px 50px rgba(80, 50, 120, 0.35), inset 0 0 0 4px rgba(255, 255, 255, 0.25);
}

.spread {
  position: relative;
  display: flex;
  width: 100%;
  height: 100%;
}

.spread.is_jumping {
  animation: page_fade_in 0.26s ease both;
}

@keyframes page_fade_in {
  from {
    opacity: 0.2;
  }
}

/* Página de papel */
.page {
  position: relative;
  flex: 0 0 var(--page_w);
  display: flex;
  flex-direction: column;
  width: var(--page_w);
  height: var(--page_h);
  color: var(--color_text);
  background: var(--paper);
  overflow: hidden;
}

/* La sombra del lomo se pinta del lado que toca el centro */
.page_left {
  border-radius: 6px 0 0 6px;
  background: linear-gradient(to left, rgba(120, 90, 60, 0.28) 0%, rgba(120, 90, 60, 0.07) 5%, transparent 14%), var(--paper);
}

.page_right {
  border-radius: 0 6px 6px 0;
  background: linear-gradient(to right, rgba(120, 90, 60, 0.28) 0%, rgba(120, 90, 60, 0.07) 5%, transparent 14%), var(--paper);
}

.page_single {
  border-radius: 6px;
}

/* Grosor del bloque de hojas visible en los bordes exteriores */
.spread > .page_left {
  box-shadow: -2px 0 0 #f3e9d6, -4px 0 0 #e9ddc5, -6px 0 0 #f1e6d1, -8px 0 0 #e2d5bb;
}

.spread > .page_right {
  box-shadow: 2px 0 0 #f3e9d6, 4px 0 0 #e9ddc5, 6px 0 0 #f1e6d1, 8px 0 0 #e2d5bb;
}

.page_single:not(.leaf_face .page) {
  box-shadow: 3px 0 0 #f3e9d6, 6px 0 0 #e9ddc5;
}

.page.is_blank {
  background-color: var(--paper);
}

.spine {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 3px;
  transform: translateX(-50%);
  background: linear-gradient(to right, rgba(90, 60, 30, 0.1), rgba(90, 60, 30, 0.35), rgba(90, 60, 30, 0.1));
  pointer-events: none;
}

.page_body {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  /* El relleno inferior deja un margen para que el texto medido siempre quepa sin recortarse */
  padding: clamp(20px, 4.5vw, 38px) clamp(20px, 4.5vw, 40px) 10px;
}

.page_number {
  flex: 0 0 38px;
  display: grid;
  place-items: center;
  font-family: var(--font_title);
  font-size: 0.85rem;
  color: var(--color_text_muted);
}

.page_date {
  margin-bottom: 4px;
  font-family: var(--font_title);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--color_pink);
}

.page_heading {
  margin-bottom: 4px;
  font-family: var(--font_title);
  font-size: 1.45rem;
  line-height: 1.2;
  color: var(--color_text);
  overflow-wrap: anywhere;
}

.page_ornament {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0 16px;
  font-size: 0.6rem;
  color: var(--color_gold);
}

.page_ornament .fa-heart {
  font-size: 0.8rem;
  color: var(--color_pink_light);
}

.page_paragraph {
  margin-bottom: 0.8em;
  font-family: var(--font_title);
  font-size: 1.02rem;
  line-height: 1.7;
  /* Conserva los espacios y saltos de línea tal como se escribieron */
  white-space: pre-wrap;
  text-align: justify;
  hyphens: auto;
  overflow-wrap: anywhere;
}

/* En una columna estrecha, el texto justificado deja huecos grandes entre palabras */
@media (max-width: 899px) {
  .page_paragraph {
    text-align: left;
  }
}

.page_paragraph.has_drop_cap::first-letter {
  float: left;
  padding: 0.06em 0.1em 0 0;
  font-size: 3.1em;
  font-weight: 700;
  line-height: 0.85;
  color: var(--color_pink);
}

/* Portada, hoja de capítulo y página final */
.kind_cover .page_body,
.kind_chapter .page_body,
.kind_end .page_body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.cover_emblem {
  font-size: 2.6rem;
  color: var(--color_pink_light);
  filter: drop-shadow(0 0 10px rgba(255, 90, 150, 0.45));
}

.cover_title {
  margin-top: 14px;
  font-family: var(--font_title);
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  line-height: 1.15;
  background: linear-gradient(90deg, var(--color_pink), var(--color_violet));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* La hoja de capítulo lleva una estrella dorada en lugar del corazón de la portada */
.kind_chapter .cover_emblem {
  color: var(--color_gold);
  filter: drop-shadow(0 0 8px rgba(255, 200, 90, 0.5));
}

.chapter_number {
  margin-top: 14px;
  font-family: var(--font_title);
  font-size: 0.95rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color_text_muted);
}

.kind_chapter .cover_title {
  margin-top: 8px;
  overflow-wrap: anywhere;
}

/* En la portada el título va arriba del todo, sin separación de más */
.kind_cover .cover_title {
  margin-top: 0;
}

.cover_names {
  margin-top: 8px;
  font-family: var(--font_title);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--color_text);
}

.cover_span {
  max-width: 24ch;
  font-family: var(--font_title);
  font-size: 0.95rem;
  color: var(--color_text_muted);
}

.kind_cover .page_ornament,
.kind_chapter .page_ornament,
.kind_end .page_ornament {
  justify-content: center;
}

/* Hoja que gira: tiene un frente y, en doble página, un reverso */
.leaf_layer {
  position: absolute;
  inset: 0;
  perspective: 2400px;
  pointer-events: none;
}

.leaf {
  position: absolute;
  top: 0;
  width: var(--page_w);
  height: var(--page_h);
  transform-style: preserve-3d;
  will-change: transform;
}

.leaf_forward {
  left: var(--page_w);
  transform-origin: left center;
}

.leaf_backward {
  left: 0;
  transform-origin: right center;
}

.leaf_single_forward,
.leaf_single_backward {
  left: 0;
  transform-origin: left center;
}

.leaf_face {
  position: absolute;
  inset: 0;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.leaf_back {
  transform: rotateY(180deg);
}

.leaf_face .page {
  width: 100%;
  height: 100%;
}

.leaf_shade {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  background: linear-gradient(to right, rgba(60, 40, 20, 0.5), rgba(60, 40, 20, 0));
}

.leaf_front .leaf_shade {
  background: linear-gradient(to left, rgba(60, 40, 20, 0.5), rgba(60, 40, 20, 0));
}

.leaf_backward .leaf_front .leaf_shade {
  background: linear-gradient(to right, rgba(60, 40, 20, 0.5), rgba(60, 40, 20, 0));
}

/* Formulario de capítulos: separado de la lista y alineado como el resto de formularios */
.chapter_form {
  margin-bottom: 20px;
  padding-top: 18px;
  text-align: left;
  border-top: 1px solid rgba(111, 85, 201, 0.18);
}

.chapter_name {
  flex-basis: 100%;
  font-family: var(--font_title);
  font-size: 1.15rem;
  overflow-wrap: anywhere;
}

.form_heading {
  margin-bottom: 14px;
  font-family: var(--font_title);
  font-size: 1.2rem;
  color: var(--color_text);
  outline: none;
}

/* Medidor invisible: tiene el tamaño de una página real */
.page_ruler {
  position: absolute;
  top: 0;
  left: -10000px;
  visibility: hidden;
  pointer-events: none;
}

/* Llegada desde el libro 3D: la lectura se prepara sin verse y, cuando el 3D ya está sobre el libro real,
   aparece encima. Primero el libro y el título; los controles un poco después, para que todo surja con calma. */
.reader_top,
.reader_status,
.book,
.reader_controls,
.reader_hint {
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reader_controls,
.reader_hint {
  transition-delay: 0.3s;
}

.reader_screen.is_arriving {
  pointer-events: none;
}

.reader_screen.is_arriving .reader_top,
.reader_screen.is_arriving .reader_status,
.reader_screen.is_arriving .book,
.reader_screen.is_arriving .reader_controls,
.reader_screen.is_arriving .reader_hint {
  opacity: 0;
}

.reader_screen.is_arriving .reader_controls,
.reader_screen.is_arriving .reader_hint {
  transform: translateY(10px);
}

/* Controles de lectura */
.reader_controls {
  display: flex;
  align-items: center;
  gap: 12px;
  width: min(100%, 560px);
}

.reader_nav_button {
  flex: 0 0 52px;
  width: 52px;
  min-height: 52px;
  font-size: 1.1rem;
  border-radius: 50%;
}

.reader_nav_button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.reader_progress {
  flex: 1;
  min-width: 0;
  text-align: center;
}

.page_indicator {
  margin-bottom: 2px;
  font-family: var(--font_title);
  font-weight: 700;
  color: var(--color_text);
  text-shadow: 0 1px 8px rgba(255, 255, 255, 0.8);
}

input[type="range"].page_slider {
  min-height: 32px;
  padding: 0;
  background: transparent;
  border: 0;
  accent-color: var(--color_pink);
  cursor: pointer;
}

.reader_hint {
  font-size: 0.85rem;
  text-align: center;
  color: var(--color_text);
  text-shadow: 0 1px 8px rgba(255, 255, 255, 0.8);
}

/* Cómo funciona: explicación breve al inicio de la pantalla de armar el libro */
/* Pasos numerados del formulario. Los números se cuentan solos y se saltan los pasos ocultos. */
/* Foto de la página: marco fijo de proporción 4:3, siempre del mismo tamaño */
.photo_group {
  margin-bottom: 18px;
}

.group_label {
  margin-bottom: 4px;
  font-size: 0.95rem;
  font-weight: 600;
  text-align: left;
}

.photo_frame,
.page_photo {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: #f1e9fa;
  border: 1px solid rgba(111, 85, 201, 0.25);
  border-radius: 10px;
  color: #a18cc8;
}

.photo_frame {
  width: min(100%, 340px);
  margin: 6px auto 10px;
}

.photo_placeholder {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

.photo_image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  /* La foto ya viene recortada a 4:3, así que llena el marco sin deformarse */
  object-fit: cover;
  display: block;
}

.photo_actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-bottom: 10px;
}

/* En la página del libro el marco nunca es más alto que una parte de la página */
.page_photo {
  width: min(100%, 340px, calc(var(--page_h) * 0.5));
  margin: 10px auto 14px;
}

/* Con foto centrada, el adorno de debajo también va centrado */
.page_photo + .page_ornament {
  justify-content: center;
}

.page_photo_icon {
  font-size: 1.8rem;
}

.list_item_photo {
  display: block;
  width: 96px;
  aspect-ratio: 4 / 3;
  margin-bottom: 10px;
  object-fit: cover;
  background: #f1e9fa;
  border-radius: 8px;
}

/* Filas de botones: el espacio entre ellos lo da "gap". El margen que se usa para apilar botones
   (form .button + .button) los desnivelaba, así que aquí se anula. Va al final para ganar en especificidad. */
.photo_actions .button + .button,
.list_item_actions .button + .button,
.pager .button + .button {
  margin-top: 0;
}

/* Los dos botones de la foto miden lo mismo, aunque sus textos sean distintos */
.photo_actions .button {
  flex: 1 1 150px;
  max-width: 220px;
  justify-content: center;
}

/* Inicio: sin tarjeta opaca, para que se vea el libro 3D que se dibuja en el cielo detrás.
   El texto lleva un halo claro para leerse sobre el cielo. */
.card_open {
  background: none;
  border: 0;
  box-shadow: none;
}

.card_open::before {
  display: none;
}

.card_open .book_title {
  background: none;
  -webkit-text-fill-color: var(--color_text);
  color: var(--color_text);
  text-shadow: 0 2px 14px rgba(255, 255, 255, 0.95), 0 0 3px rgba(255, 255, 255, 0.8);
}

.card_open .screen_hint,
.card_open .button_link {
  color: var(--color_text);
  text-shadow: 0 1px 10px rgba(255, 255, 255, 0.95), 0 0 3px rgba(255, 255, 255, 0.8);
}

.card_open .screen_hint {
  margin-bottom: 8px;
}

/* El espacio que ocupa el libro. El botón encima lo hace tocable y accesible. */
.home_hero {
  position: relative;
  width: min(100%, 280px);
  height: 300px;
  margin: 0 auto 18px;
}

/* El inicio debe caber en pantalla sin desplazarse: el libro ocupa lo que sobra después del título y el menú.
   Primero con vh y, si el navegador lo soporta, con dvh. */
.home_hero {
  height: clamp(150px, calc(100vh - 544px), 300px);
  height: clamp(150px, calc(100dvh - 544px), 300px);
}

#home_screen {
  padding-block: 24px;
}

/* En pantallas bajas todo el inicio se compacta para seguir sin desplazamiento */
@media (max-height: 700px) {
  #home_screen {
    padding-block: 12px;
  }

  #home_screen .card {
    padding: 16px 24px;
  }

  #home_screen .screen_hint {
    margin: 6px 0 4px;
  }

  #home_screen .home_hero {
    height: clamp(140px, calc(100vh - 444px), 300px);
    height: clamp(140px, calc(100dvh - 444px), 300px);
    margin-bottom: 8px;
  }

  #home_screen .menu {
    gap: 8px;
    margin-bottom: 8px;
  }

  #home_screen .button {
    min-height: 44px;
  }

  #home_screen .button_link {
    margin-top: 0;
  }
}

.home_book_button {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 0;
  color: var(--color_pink);
  background: none;
  border: 0;
  border-radius: 28px;
  cursor: pointer;
}

.home_book_button:focus-visible {
  outline: 3px solid var(--color_focus);
  outline-offset: 4px;
}

/* Al pulsar "Leer el libro" el inicio se desvanece (menos el libro) mientras el 3D abre la tapa */
#home_screen.is_leaving {
  pointer-events: none;
}

#home_screen.is_leaving .card_open > :not(.home_hero) {
  opacity: 0;
  transition: opacity 0.35s ease;
}

/* Dibujo de respaldo: solo se ve si el 3D no está disponible */
.home_book_fallback {
  font-size: 6.5rem;
  color: var(--color_pink);
  text-shadow: 0 6px 24px rgba(255, 255, 255, 0.9);
}

.home_book_button.has_3d_book .home_book_fallback {
  display: none;
}

/* Movimiento reducido: sin animaciones, todo queda visible y quieto */
@media (prefers-reduced-motion: reduce) {
  .card,
  .card::before,
  .book_title,
  .orbit,
  .orbit_spin,
  .heart_shape,
  .heart_shine {
    animation: none;
  }

  .sparkle {
    animation: none;
    opacity: 0.75;
    transform: translate(-50%, -50%) scale(0.9);
  }

  .button,
  .icon_button,
  .button_primary::after,
  .panel > summary::after,
  .paste_box > summary::after,
  textarea,
  input {
    transition: none;
  }

  .spread.is_jumping {
    animation: none;
  }

}

/* Derechos de autor: una línea discreta al pie de la tarjeta */
.copyright {
  margin-top: 12px;
  font-size: 0.8rem;
  line-height: 1.4;
  text-align: center;
  color: var(--color_text_muted);
}