:root {
  color-scheme: light;
  --bg: #f6f2ef;
  --paper: #ffffff;
  --ink: #000000;
  --accent: #40263e;
  --accent-2: #550029;
  --rose: #fe91b8;
  --muted: #5a4b54;
  --border: #d8c5cf;
  --shadow: 0 10px 28px rgba(64, 38, 62, 0.12);
  --serif: ui-serif, Georgia, "Times New Roman", Times, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--sans);
  background: radial-gradient(circle at top left, #fff 0%, #f7f0f4 45%, #efe4ea 100%);
  color: var(--ink);
}

.site-header {
  display: grid;
  gap: 0.8rem;
  padding: 2.2rem 6vw 1.4rem;
}

.nb-lockup {
  display: inline-flex;
  width: fit-content;
  opacity: 0.92;
}

.nb-lockup img {
  height: 28px;
  width: auto;
}

.title-block h1 {
  margin: 0 0 0.45rem;
  font-family: var(--serif);
  font-size: clamp(1.9rem, 3.7vw, 3rem);
}

.title-block p {
  margin: 0;
  color: var(--muted);
}

.info-trigger {
  margin-top: 0.55rem;
  border: 0;
  background: transparent;
  color: var(--accent-2);
  font-family: var(--serif);
  font-size: 1rem;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: rgba(85, 0, 41, 0.35);
  text-underline-offset: 0.16rem;
}

.info-trigger:hover {
  text-decoration-color: var(--accent-2);
}

main {
  padding: 0 6vw 3rem;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 1rem;
}

.viewer-column {
  display: grid;
  gap: 1rem;
}

.controls-panel {
  display: grid;
  gap: 0.7rem;
}

.control-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.nav-btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--accent);
  border-radius: 10px;
  font-size: 0.88rem;
  padding: 0.3rem 0.55rem;
}

.nav-btn:disabled {
  opacity: 0.45;
  cursor: default;
}

.page-indicator {
  color: var(--muted);
  font-size: 0.9rem;
  min-width: 6.8rem;
  text-align: center;
}

.reading-layout {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(340px, 1fr);
  gap: 1rem;
  align-items: start;
}

.image-wrap {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: #0a0a0a;
}

#page-image {
  display: block;
  width: 100%;
  height: auto;
  cursor: zoom-in;
}

.image-hint {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.text-grid {
  display: grid;
  gap: 0.55rem;
}

.parallel-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0.7rem;
  margin: -0.1rem 0 0.6rem;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.region-block {
  border: 1px solid rgba(216, 197, 207, 0.75);
  border-radius: 10px;
  padding: 0.55rem;
  background: #fff;
}

.line-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0.7rem;
  align-items: start;
  padding-top: 0.15rem;
  margin-top: 0.15rem;
}

.line-text {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
  margin: 0;
}

.translation-placeholder {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  border-left: 2px solid var(--rose);
  padding-left: 0.45rem;
}

.muted {
  color: var(--muted);
}

.image-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.9);
  display: grid;
  place-items: center;
  padding: 2.5rem;
}

.image-overlay[hidden] {
  display: none;
}

.overlay-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  font-size: 1.25rem;
  line-height: 1;
  padding: 0;
}

#overlay-image {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.info-overlay {
  position: fixed;
  inset: 0;
  z-index: 1100;
  background: rgba(0, 0, 0, 0.72);
  display: grid;
  place-items: center;
  padding: 1.2rem;
}

.info-overlay[hidden] {
  display: none;
}

.info-dialog {
  position: relative;
  width: min(760px, 100%);
  max-height: min(86vh, 920px);
  overflow: auto;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 1.2rem 1.2rem 1rem;
}

.info-dialog h2 {
  margin: 0 0 0.7rem;
  font-family: var(--serif);
  color: var(--accent);
}

.info-dialog p {
  margin: 0.6rem 0 0;
  color: #2d212a;
  line-height: 1.52;
}

.info-dialog .info-ingress {
  margin-top: 0;
  font-weight: 600;
  color: var(--accent);
}

.info-subtitle {
  margin: 1rem 0 0.55rem;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.info-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0;
}

.info-links a {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.34rem 0.6rem;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
}

.info-links a:hover {
  border-color: var(--accent-2);
}

@media (max-width: 900px) {
  .reading-layout {
    grid-template-columns: 1fr;
  }

  .parallel-head {
    display: none;
  }

  .line-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}