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

/* La biblioteca es más ancha que las documentaciones, para que las tres fichas por fila luzcan. */
.container {
  width: min(100% - 2rem, 88rem);
}

/* ---------- Marca ---------- */

.brand__mark--logo {
  overflow: hidden;
  background: #110b0f;
  box-shadow: 0 6px 16px -8px rgb(220 38 38 / 0.6);
}

.brand__mark--logo img {
  width: 100%;
  height: 100%;
}

.dark .brand__mark--logo {
  box-shadow: 0 0 0 1px rgb(255 255 255 / 0.1);
}

/* ---------- Cabecera de la página ---------- */

.hero + .section {
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
}

/* ---------- Inicio: mosaico de capturas, marcador y tecnologías ---------- */

.hero--mosaic {
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  padding-block: 4rem 0;
}

.mosaic {
  position: absolute;
  inset: -30% -15%;
  z-index: -2;
  opacity: 0.4;
  transform: rotate(-12deg);
  pointer-events: none;
}

.mosaic__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.mosaic__grid img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

.mosaic__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 55% 60% at 50% 45%, var(--bg) 30%, transparent 85%),
    linear-gradient(180deg, transparent 70%, var(--bg));
  pointer-events: none;
}

.hero__center {
  display: grid;
  justify-items: center;
  gap: 1.25rem;
  text-align: center;
}

.hero__center .hero__claim {
  max-width: 26ch;
}

.hero__center .hero__actions {
  justify-content: center;
}

.scores {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  width: min(100%, 52rem);
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.score {
  display: grid;
  gap: 0.25rem;
  padding: 1.25rem 1rem;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
}

.score strong {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 3.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  background-image: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: var(--brand-600);
  -webkit-text-fill-color: transparent;
}

.score span {
  color: var(--fg-muted);
  font-size: 0.9375rem;
}

.tech-marquee {
  width: 100%;
  margin-top: 3rem;
  padding-block: 1.25rem 2.5rem;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}

.tech-marquee__track {
  display: flex;
  gap: 0.75rem;
  width: max-content;
}

.tech-marquee__track span {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.9375rem;
  font-weight: 600;
  white-space: nowrap;
}

@media (min-width: 48rem) {
  .scores {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .mosaic__grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: no-preference) {
  .mosaic__grid {
    animation: mosaic-drift 60s linear infinite;
  }

  .tech-marquee__track {
    animation: marquee 40s linear infinite;
  }
}

@keyframes mosaic-drift {
  to {
    transform: translateY(-50%);
  }
}

@keyframes marquee {
  to {
    transform: translateX(-50%);
  }
}

/* ---------- Sobre el autor ---------- */

.author {
  display: grid;
  gap: 1rem;
  padding: 1.75rem;
}

.author p {
  color: var(--fg-muted);
}

.author strong {
  color: var(--fg);
}

.author__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* ---------- Buscador y filtros ---------- */

.toolbar {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.toolbar[hidden] {
  display: none;
}

.search {
  position: relative;
  max-width: 28rem;
}

.search .icon {
  position: absolute;
  top: 50%;
  left: 0.875rem;
  color: var(--fg-muted);
  transform: translateY(-50%);
  pointer-events: none;
}

.search input {
  width: 100%;
  min-height: 3rem;
  padding: 0.625rem 1rem 0.625rem 2.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  color: var(--fg);
  font: inherit;
}

.search input::placeholder {
  color: var(--fg-muted);
}

.search input:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 1px;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.filter {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  min-height: 2.5rem;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--fg-muted);
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background-color 150ms ease,
    color 150ms ease,
    border-color 150ms ease;
}

.filter[hidden] {
  display: none;
}

.filter:hover {
  color: var(--fg);
}

.filter[aria-pressed='true'] {
  border-color: transparent;
  background: var(--brand-tint);
  color: var(--brand-ink);
}

.filter__count {
  color: inherit;
  font-variant-numeric: tabular-nums;
  opacity: 0.7;
}

.results {
  color: var(--fg-muted);
  font-size: 0.9375rem;
}

/* ---------- Estantería ---------- */

.shelf {
  display: grid;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.shelf > li[hidden] {
  display: none;
}

.book {
  --book-accent: var(--accent-light, var(--primary));
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
  height: 100%;
}

.book::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  z-index: 1;
  width: 6px;
  background: var(--book-accent);
}

.book__cover {
  position: relative;
  display: block;
  overflow: hidden;
  padding: 1.25rem 1.25rem 0 1.5rem;
  background:
    radial-gradient(120% 80% at 50% 0%, color-mix(in srgb, var(--book-accent) 18%, transparent), transparent 70%),
    var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.book__frame {
  position: relative;
  overflow: hidden;
  padding-top: 1.5rem;
  border: 1px solid var(--border);
  border-bottom: 0;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: var(--surface);
  box-shadow: var(--shadow-md);
}

.book__frame::before {
  content: '';
  position: absolute;
  top: 0.5rem;
  left: 0.75rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: #f87171;
  box-shadow:
    0.875rem 0 0 #fbbf24,
    1.75rem 0 0 #4ade80;
}

.book__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: top;
}

.book__thumb--dark,
.dark .book__thumb--light {
  display: none !important;
}

.dark .book__thumb--dark {
  display: block !important;
}

.book__body {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem 1.5rem 1.5rem 1.75rem;
}

.book__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  color: var(--fg-muted);
  font-size: 0.875rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.125rem 0.625rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--book-accent) 14%, transparent);
  color: var(--fg);
  font-weight: 600;
}

.badge::before {
  content: '';
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--book-accent);
}

.book h3 {
  font-size: 1.5rem;
}

.book__link {
  text-decoration: none;
}

.book__link::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
}

.book__link:focus-visible {
  outline: none;
}

.book:has(.book__link:focus-visible) {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.book p {
  color: var(--fg-muted);
}

.book__actions {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  margin-top: auto;
  padding-top: 0.5rem;
}

.book__read {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--brand-ink);
  font-weight: 700;
  text-decoration: none;
}

.book__read .icon {
  transition: transform 200ms var(--ease-out);
}

.book:hover .book__read .icon {
  transform: translateX(3px);
}

.book__extra {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  color: var(--fg-muted);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
}

.book__extra:hover {
  color: var(--fg);
}

.book__actions .book__read {
  margin-right: auto;
}

.dark .book {
  --book-accent: var(--accent-dark, var(--primary));
}

/* ---------- Estado vacío ---------- */

.empty {
  display: grid;
  justify-items: center;
  gap: 0.75rem;
  padding: 3rem 1.5rem;
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
}

.empty[hidden] {
  display: none;
}

.empty .feature__icon {
  width: 3rem;
  height: 3rem;
}

.empty p {
  max-width: 28rem;
  color: var(--fg-muted);
}

/* ---------- Puntos de corte ---------- */

@media (min-width: 40rem) {
  .toolbar {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .results {
    grid-column: 1 / -1;
  }
}

@media (min-width: 52rem) {
  .shelf {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2rem;
  }
}

/* Como máximo tres fichas por fila, para que la miniatura se vea bien, con una ficha más compacta. */
@media (min-width: 64rem) {
  .shelf {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .book__cover {
    padding: 1rem 1rem 0 1.25rem;
  }

  .book__body {
    gap: 0.625rem;
    padding: 1rem 1.25rem 1.25rem 1.5rem;
  }

  .book h3 {
    font-size: 1.25rem;
  }

  .book p {
    font-size: 0.9375rem;
  }

  .book__meta,
  .book__extra {
    font-size: 0.8125rem;
  }

  .book__actions {
    gap: 0.375rem 0.75rem;
    padding-top: 0.25rem;
  }

  .book__read {
    font-size: 0.9375rem;
  }
}

@media (prefers-reduced-motion: no-preference) and (hover: hover) and (pointer: fine) {
  .book__frame {
    transition: transform 400ms var(--ease-out);
  }

  .book:hover .book__frame {
    transform: translateY(-6px);
  }
}