/* BeforeYouBookReading — editorial card, dialog, and standalone surfaces */

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

.byb-card-grid { gap: var(--space-4); }
.byb-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}
.byb-card:focus { outline: none; }
.byb-card:focus-visible {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}
.byb-card__number,
.byb-reading-overlay__kind {
  font-size: var(--text-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.byb-card__title { display: block; margin: var(--space-3) 0; }
.byb-card__summary { display: block; flex: 1; }
.byb-card__cta {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  margin-top: var(--space-5);
}

.byb-proof {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  margin-top: var(--space-6);
  background: var(--color-surface);
}
.byb-ask {
  border-left: 2px solid var(--elz-black);
  background: var(--color-surface-subtle);
  padding: var(--space-4) var(--space-5);
  margin-top: var(--space-6);
  font-size: var(--text-lg);
  line-height: var(--leading-xl);
  color: var(--color-text-primary);
}
.byb-ask .label { display: block; margin-bottom: var(--space-1); }

.byb-reading-overlay {
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  padding: 0;
  margin: 0;
  border: 0;
  color: var(--color-text-primary);
  background: transparent;
}
.byb-reading-overlay::backdrop {
  background: rgba(15, 15, 15, .48);
  opacity: 0;
  transition: opacity 240ms var(--ease-out);
}
.byb-reading-overlay[open]::backdrop,
.byb-reading-overlay.is-open::backdrop { opacity: 1; }
.byb-reading-overlay.is-closing::backdrop { opacity: 0; }
.byb-reading-overlay__surface {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100dvh;
  max-height: 100dvh;
  margin: auto;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 240ms var(--ease-out), transform 240ms var(--ease-out);
}
.byb-reading-overlay.is-open .byb-reading-overlay__surface {
  opacity: 1;
  transform: translateY(0);
}
.byb-reading-overlay.is-closing .byb-reading-overlay__surface {
  opacity: 0;
  transform: translateY(8px);
}
.byb-reading-overlay__header {
  z-index: 2;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-3);
  min-height: 56px;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}
.byb-reading-overlay__identity { min-width: 0; }
.byb-reading-overlay__kind { margin: 0; }
.byb-reading-overlay__title {
  margin: .15rem 0 0;
  overflow: hidden;
  font-family: var(--font-serif);
  font-size: var(--text-md);
  line-height: var(--leading-snug);
  white-space: nowrap;
  text-overflow: ellipsis;
}
.byb-reading-overlay__back,
.byb-reading-overlay__close,
.byb-share {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  min-width: 44px;
  min-height: 44px;
  padding: .5rem .75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text-primary);
  font: inherit;
  font-size: var(--text-sm);
  cursor: pointer;
}
.byb-reading-overlay__close {
  width: 44px;
  height: 44px;
  padding: 0;
}
.byb-reading-overlay__back:focus-visible,
.byb-reading-overlay__close:focus-visible,
.byb-share:focus-visible {
  outline: 2px solid var(--color-text-primary);
  outline-offset: 2px;
}
.byb-reading-overlay__scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}
.byb-reading-overlay__content,
.byb-reading-overlay__footer {
  width: min(68ch, 100%);
  margin: 0 auto;
  padding-left: var(--space-5);
  padding-right: var(--space-5);
}
.byb-reading-overlay__content { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.byb-reading-overlay__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-4);
  padding-bottom: var(--space-10);
  border-top: 1px solid var(--color-border);
}
.byb-share-status {
  min-height: 1.3em;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
body.byb-overlay-open { overflow: hidden; }

.byb-standalone__back {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  min-height: 44px;
}
.byb-standalone__tools {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

@media (hover: hover) and (pointer: fine) {
  .byb-card:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }
  .byb-card:active { box-shadow: var(--shadow-sm); transform: translateY(0); }
  .byb-reading-overlay__back:hover,
  .byb-reading-overlay__close:hover,
  .byb-share:hover { border-color: var(--color-text-tertiary); }
}

@media (min-width: 768px) {
  .byb-reading-overlay__surface {
    width: calc(100vw - 32px);
    height: calc(100dvh - 32px);
    max-height: calc(100dvh - 32px);
    border-radius: var(--radius-xl);
    transform: translateY(12px) scale(.99);
  }
  .byb-reading-overlay.is-open .byb-reading-overlay__surface {
    transform: translateY(0) scale(1);
  }
  .byb-reading-overlay__header { padding: var(--space-4) var(--space-6); }
  .byb-reading-overlay__content,
  .byb-reading-overlay__footer {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

@media (min-width: 1024px) {
  .byb-reading-overlay__surface {
    width: min(920px, calc(100vw - 64px));
    height: auto;
    max-height: calc(100dvh - 48px);
  }
  .byb-reading-overlay__title { font-size: var(--text-lg); }
}

@media (prefers-reduced-motion: reduce) {
  .byb-reading-overlay::backdrop,
  .byb-reading-overlay__surface {
    transition: opacity 120ms linear;
    transform: none;
  }
  .byb-reading-overlay.is-open .byb-reading-overlay__surface { transform: none; }
}