:root {
  --flashcards-bg: radial-gradient(circle at top, rgba(55, 87, 152, 0.92) 0%, rgba(13, 29, 56, 0.96) 32%, rgba(3, 7, 14, 0.98) 100%);
  --flashcards-panel: rgba(10, 18, 33, 0.84);
  --flashcards-panel-strong: rgba(14, 24, 44, 0.94);
  --flashcards-line: rgba(148, 190, 255, 0.18);
  --flashcards-line-strong: rgba(148, 190, 255, 0.3);
  --flashcards-text: #eff6ff;
  --flashcards-muted: #9cb4d4;
  --flashcards-accent: #7bdcff;
  --flashcards-accent-strong: #b4f2ff;
  --flashcards-shadow: 0 28px 80px rgba(0, 0, 0, 0.4);
  --flashcards-radius: 28px;
  --flashcards-width: min(100%, 31rem);
  --flashcards-brand-backdrop: url('../images/resources/peptribe-bg-scifi.png');
  --flashcards-brand-logo: url('../images/resources/peptribe-wordmark.png');
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

.flashcards-shell-wrap {
  position: relative;
  z-index: 2;
}

.flashcards-app-shell {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-rows: 1fr;
}

.flashcards-root,
.flashcards-stage {
  width: var(--flashcards-width);
  margin: 0 auto;
}

.flashcards-stage {
  display: block;
  padding-bottom: 0.25rem;
}

.flashcards-statusbar,
.flashcards-toolbar {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.flashcards-statusbar {
  justify-content: flex-start;
  margin-bottom: 0.65rem;
}

.flashcards-statusbar[hidden],
.flashcards-toolbar[hidden] {
  display: none !important;
}

.flashcards-icon-button,
.flashcards-nav,
.flashcards-search-result,
.flashcards-heart,
.flashcards-inline-button {
  border: 0;
  color: inherit;
  font: inherit;
}

.flashcards-icon-button,
.flashcards-inline-button {
  min-height: 2.75rem;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--flashcards-line);
  backdrop-filter: blur(18px);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
  cursor: pointer;
  white-space: nowrap;
}

.flashcards-icon-button.is-active {
  color: var(--flashcards-accent-strong);
  border-color: rgba(123, 220, 255, 0.45);
}

.flashcards-card-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.85rem;
  align-items: center;
  margin: 0;
}

.flashcards-nav {
  width: 3.15rem;
  height: 3.15rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--flashcards-line);
  backdrop-filter: blur(18px);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  cursor: pointer;
  box-shadow: var(--flashcards-shadow);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.flashcards-nav:hover,
.flashcards-icon-button:hover,
.flashcards-heart:hover,
.flashcards-inline-button:hover,
.flashcards-search-result:hover {
  transform: translateY(-1px);
  border-color: var(--flashcards-line-strong);
  background: rgba(255, 255, 255, 0.1);
}

.flashcards-nav:disabled,
.flashcards-heart:disabled,
.flashcards-icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none;
}

.flashcards-card-shell {
  position: relative;
  min-height: calc(100dvh - 16rem);
  height: min(74rem, calc(100dvh - 16rem));
  overflow: auto;
  border-radius: calc(var(--flashcards-radius) + 4px);
  background:
    linear-gradient(180deg, rgba(123, 220, 255, 0.09), transparent 16%),
    linear-gradient(180deg, rgba(4, 7, 13, 0.1), rgba(4, 7, 13, 0.72)),
    rgba(7, 14, 26, 0.82);
  border: 1px solid var(--flashcards-line-strong);
  box-shadow: var(--flashcards-shadow);
  touch-action: pan-y pan-x;
  user-select: none;
}

.flashcards-card-shell::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(transparent 0 93%, rgba(123, 220, 255, 0.08) 93% 94%, transparent 94% 100%),
    linear-gradient(90deg, transparent 0 93%, rgba(123, 220, 255, 0.08) 93% 94%, transparent 94% 100%);
  background-size: 100% 3rem, 3rem 100%;
  opacity: 0.2;
  pointer-events: none;
}

.flashcards-card-shell.is-dragging .flashcards-card {
  transform: translate3d(calc(var(--drag-x, 0px) * 0.16), calc(var(--drag-y, 0px) * 0.16), 0);
}

.flashcards-card {
  position: relative;
  width: var(--flashcards-content-width, 100%);
  min-height: var(--flashcards-content-height, auto);
  margin: 0 auto;
  transition: transform 220ms ease, opacity 220ms ease;
}

.flashcards-card-media {
  position: relative;
  min-height: 0;
}

.flashcards-card-media img {
  width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
}

.flashcards-card-copy {
  display: none;
}

.flashcards-viewer-controls,
.flashcards-view-controls {
  display: inline-flex;
  gap: 0.35rem;
}

.flashcards-viewer-controls {
  position: sticky;
  z-index: 3;
  top: 0.85rem;
  display: flex;
  width: fit-content;
  margin: 0.8rem 0 0 auto;
  padding-right: 0.8rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.flashcards-view-controls .flashcards-icon-button {
  min-width: 2.75rem;
  padding-inline: 0.75rem;
}

.flashcards-toolbar {
  margin-top: 0.7rem;
}

.flashcards-heart {
  min-height: 3.35rem;
  padding: 0.75rem 1.05rem;
  border-radius: 1.15rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--flashcards-line);
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.flashcards-heart.is-active {
  background: rgba(244, 117, 147, 0.18);
  border-color: rgba(255, 159, 183, 0.45);
}

.flashcards-heart-icon {
  font-size: 1.2rem;
  color: #ff8ead;
}

.flashcards-status {
  flex: 1;
  text-align: right;
  font-size: 0.95rem;
  color: var(--flashcards-muted);
}

.flashcards-status[data-state='active'] {
  color: var(--flashcards-accent-strong);
}

.flashcards-search-panel,
.flashcards-saved-drawer {
  margin-top: 0.5rem;
  padding: 1rem;
  border-radius: 1.5rem;
  border: 1px solid var(--flashcards-line);
  background: var(--flashcards-panel);
  backdrop-filter: blur(20px);
  box-shadow: var(--flashcards-shadow);
}

.flashcards-search-header,
.flashcards-saved-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.flashcards-search-eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--flashcards-muted);
}

.flashcards-search-header h2,
.flashcards-saved-header h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 0.95;
}

.flashcards-search-field {
  display: block;
  margin: 1rem 0 0.75rem;
}

.flashcards-search-field input {
  width: 100%;
  min-height: 3.2rem;
  border-radius: 1rem;
  border: 1px solid var(--flashcards-line);
  background: rgba(0, 0, 0, 0.2);
  color: var(--flashcards-text);
  padding: 0.85rem 1rem;
  font: inherit;
}

.flashcards-search-meta {
  margin-bottom: 0.65rem;
  font-size: 0.92rem;
  color: var(--flashcards-muted);
}

.flashcards-search-results,
.flashcards-saved-results {
  display: grid;
  gap: 0.65rem;
}

.flashcards-search-result,
.flashcards-search-empty {
  width: 100%;
  border-radius: 1rem;
  padding: 0.95rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--flashcards-line);
}

.flashcards-search-result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  text-align: left;
  cursor: pointer;
}

.flashcards-search-result strong,
.flashcards-search-empty strong {
  display: block;
  color: var(--flashcards-text);
  margin-bottom: 0.2rem;
}

.flashcards-search-result small,
.flashcards-search-empty span {
  display: block;
  color: var(--flashcards-muted);
}

.flashcards-search-result.is-current {
  border-color: rgba(123, 220, 255, 0.45);
  background: rgba(123, 220, 255, 0.1);
}

.flashcards-search-empty {
  display: grid;
  gap: 0.3rem;
}

.flashcards-stage:fullscreen {
  width: 100dvw;
  min-height: 100dvh;
  height: 100dvh;
  margin: 0;
  padding: 0;
  background-image:
    linear-gradient(180deg, rgba(4, 7, 13, 0.45), rgba(4, 7, 13, 0.82)),
    var(--flashcards-brand-backdrop);
  background-size: cover;
  background-position: center;
}

.flashcards-stage:fullscreen .flashcards-card-shell {
  width: 100dvw;
  min-height: 100dvh;
  height: 100dvh;
  overflow-y: auto;
  border-radius: 0;
  border: 0;
}

.flashcards-stage:fullscreen::after {
  content: '';
  position: absolute;
  z-index: 1;
  top: max(0.9rem, env(safe-area-inset-top));
  left: 1rem;
  width: 12rem;
  height: 4.25rem;
  background-image: var(--flashcards-brand-logo);
  background-repeat: no-repeat;
  background-size: contain;
  opacity: 0.18;
  pointer-events: none;
}

.flashcards-stage:fullscreen .flashcards-statusbar,
.flashcards-stage:fullscreen .flashcards-toolbar,
.flashcards-stage:fullscreen .flashcards-search-panel,
.flashcards-stage:fullscreen .flashcards-saved-drawer {
  position: relative;
  z-index: 2;
}

.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;
}

@media (max-width: 720px) {
  .flashcards-root,
  .flashcards-stage {
    width: 100%;
  }

  .flashcards-card-row {
    grid-template-columns: 1fr;
    position: relative;
  }

  .flashcards-nav {
    position: absolute;
    z-index: 5;
    bottom: 1rem;
    width: 3rem;
    height: 3rem;
    background: rgba(4, 7, 13, 0.72);
  }

  .flashcards-nav--prev {
    left: 1rem;
  }

  .flashcards-nav--next {
    right: 1rem;
  }

  .flashcards-card-shell {
    min-height: calc(100dvh - 14rem);
    height: calc(100dvh - 14rem);
  }

  .flashcards-statusbar,
  .flashcards-toolbar {
    flex-wrap: wrap;
  }

  .flashcards-status {
    flex-basis: 100%;
    text-align: left;
  }
}

@media (hover: none) and (pointer: coarse) {
  .flashcards-stage[data-reader-mode='mobile'] {
    position: fixed;
    z-index: 40;
    inset: 0;
    width: 100dvw;
    min-height: 100dvh;
    height: 100dvh;
    margin: 0;
    padding: 0;
  }

  .flashcards-stage[data-reader-mode='mobile'] .flashcards-card-row {
    margin: 0;
  }

  .flashcards-stage[data-reader-mode='mobile'] .flashcards-card-shell {
    width: 100dvw;
    min-height: 100dvh;
    height: 100dvh;
    overflow-y: auto;
    border: 0;
    border-radius: 0;
  }

  .flashcards-stage[data-reader-mode='mobile'] .flashcards-statusbar {
    position: absolute;
    z-index: 4;
    top: max(0.75rem, env(safe-area-inset-top));
    left: 0.75rem;
    right: 0.75rem;
    justify-content: flex-start;
    gap: 0.5rem;
  }

  .flashcards-stage[data-reader-mode='mobile'] .flashcards-toolbar {
    position: absolute;
    z-index: 4;
    left: 0.75rem;
    right: 0.75rem;
    bottom: max(0.75rem, env(safe-area-inset-bottom));
    margin: 0;
  }

  .flashcards-stage[data-reader-mode='mobile'] .flashcards-statusbar .flashcards-icon-button {
    min-height: 2.35rem;
    padding: 0.48rem 0.8rem;
    font-size: 0.88rem;
    background: rgba(4, 7, 13, 0.75);
  }

  .flashcards-stage[data-reader-mode='mobile'] .flashcards-search-panel,
  .flashcards-stage[data-reader-mode='mobile'] .flashcards-saved-drawer {
    position: absolute;
    z-index: 5;
    top: max(0.75rem, env(safe-area-inset-top));
    right: 0.75rem;
    bottom: max(0.75rem, env(safe-area-inset-bottom));
    left: 0.75rem;
    margin: 0;
    overflow-y: auto;
  }

  .flashcards-stage[data-reader-mode='mobile'][data-controls-visible='false'] .flashcards-statusbar,
  .flashcards-stage[data-reader-mode='mobile'][data-controls-visible='false'] .flashcards-toolbar {
    display: none;
  }

  .flashcards-stage[data-reader-mode='mobile'] .flashcards-viewer-controls {
    display: none;
  }
}

@media (min-width: 721px) {
  .flashcards-card-shell {
    min-height: calc(100dvh - 14rem);
    height: min(74rem, calc(100dvh - 14rem));
  }
}