:root {
  --bg: #fff;
  --fg: #111;
  --line: #111;
  --muted: #5a5a5a;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: "Times New Roman", Georgia, serif;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.layout {
  position: relative;
  width: min(1420px, 98vw);
  height: min(900px, 96vh);
  border: 1px solid var(--line);
  background: #f6f6f3;
  display: grid;
  grid-template-columns: minmax(170px, 200px) minmax(680px, 1fr) minmax(170px, 200px);
  gap: 0.9rem;
  padding: 1rem;
  align-items: stretch;
  overflow: hidden;
}

.sources-column {
  display: grid;
  grid-template-rows: repeat(2, auto);
  align-content: start;
  gap: 0.7rem;
  padding: 0.55rem;
  border: 1px solid var(--line);
  background: #fcfcfa;
  min-height: 0;
  overflow: hidden;
}

.sources-left {
  border-right: 2px solid var(--line);
  padding-right: 0.95rem;
}

.sources-right {
  border-left: 2px solid var(--line);
  padding-left: 0.95rem;
}

.reader {
  width: 100%;
  height: 100%;
  border: 2px solid var(--line);
  background: #fff;
  display: grid;
  grid-template-rows: 1fr auto;
  z-index: 2;
  min-height: 0;
  overflow: hidden;
}

button {
  font: inherit;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--fg);
  padding: 0.35rem 0.55rem;
  cursor: pointer;
}

button:hover,
button:focus-visible {
  background: #111;
  color: #fff;
}

.passage {
  margin: 0;
  position: relative;
  overflow: hidden;
  line-height: 1.5;
  font-size: 1.02rem;
}

.passage-layer {
  position: absolute;
  inset: 0;
  padding: 1rem;
  overflow-y: auto;
  opacity: 0;
  transform: translateY(0);
  transition: transform 420ms cubic-bezier(0.2, 0.7, 0.25, 1), opacity 420ms ease;
  will-change: transform, opacity;
  pointer-events: none;
}

.passage-layer.active {
  opacity: 1;
  pointer-events: auto;
}

.passage-layer.inactive {
  opacity: 0;
}

.passage-layer p {
  margin: 0 0 0.75rem;
  text-wrap: pretty;
}

.italic-callout {
  width: fit-content;
  max-width: min(92%, 560px);
  margin: 1.1rem auto 1.3rem;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--line);
  text-align: center;
  font-size: 0.98rem;
  line-height: 1.45;
  background: #f8f8f5;
}

.inline-italic-callout {
  display: inline-block;
  margin: 0 0.12rem;
  padding: 0.03rem 0.32rem;
  border: 1px solid var(--line);
  background: #f8f8f5;
}

.inline-italic-callout em {
  font-style: italic;
}

.inline-quote-callout {
  display: inline-block;
  margin: 0 0.12rem;
  padding: 0.03rem 0.32rem;
  border: 1px solid var(--line);
  background: #f8f8f5;
}

@media (prefers-reduced-motion: reduce) {
  .passage-layer {
    transition: none;
  }
}

.hint {
  margin: 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.83rem;
  padding: 0.55rem 0.85rem;
}

.footnote {
  font-size: 0.75em;
  vertical-align: super;
  margin-left: 0.15rem;
  border: 1px solid var(--line);
  text-decoration: none;
  padding: 0 0.2rem;
}

.footnote:hover,
.footnote:focus-visible {
  background: #111;
  color: #fff;
}

.source-box {
  position: relative;
  width: 100%;
  min-height: 170px;
  border: 1px solid var(--line);
  background: #fff;
  display: grid;
  grid-template-rows: auto auto;
  z-index: 1;
  min-height: 0;
  overflow: hidden;
}

.source-header {
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.05rem 0;
}

.source-box h2 {
  margin: 0;
  padding: 0.35rem 0.35rem 0.35rem 0.5rem;
  font-size: 0.73rem;
  font-weight: normal;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.source-preview-wrap {
  padding: 0.6rem 0.35rem 0.75rem;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: auto;
}

.source-preview {
  display: block;
  flex: 0 0 auto;
  width: 120px;
  max-width: 72%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #f2f2ef;
}

.source-box.active {
  outline: 2px solid #111;
  outline-offset: 1px;
}

@media (max-width: 840px) {
  .layout {
    width: 100%;
    height: auto;
    min-height: 100vh;
    padding: 0.7rem;
    border: 0;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    gap: 0.8rem;
  }

  .sources-column {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
    gap: 0.7rem;
    padding: 0.6rem;
  }

  .sources-left,
  .sources-right {
    border-left: 1px solid var(--line);
    border-right: 1px solid var(--line);
    padding-left: 0.6rem;
    padding-right: 0.6rem;
  }

  .sources-left {
    order: 1;
  }

  .reader {
    order: 2;
    width: 100%;
    height: 56vh;
  }

  .sources-right {
    order: 3;
  }

  .source-box {
    width: 100%;
    min-height: 180px;
  }

}