:root {
  --deck-paper: #f3efe6;
  --deck-paper-raised: #fbf8f1;
  --deck-ink: #202628;
  --deck-ink-soft: #596365;
  --deck-panel: #252c2e;
  --deck-accent: #d86655;
  --deck-accent-soft: #f0a58e;
  --deck-line: rgba(32, 38, 40, 0.16);
  --deck-shadow: 0 26px 80px rgba(17, 24, 25, 0.17), 0 3px 12px rgba(17, 24, 25, 0.1);
  --deck-radius: 12px;
  --deck-header-height: 68px;
  --deck-rail-width: 280px;
  --deck-font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  --deck-font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html {
  color-scheme: light;
  background: #dcd7ce;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--deck-ink);
  font-family: var(--deck-font-sans);
  background:
    radial-gradient(circle at 78% 6%, color-mix(in srgb, var(--deck-accent) 13%, transparent), transparent 30rem),
    radial-gradient(circle at 5% 88%, color-mix(in srgb, var(--deck-accent-soft) 11%, transparent), transparent 32rem),
    linear-gradient(135deg, #e3ded4, var(--deck-paper) 48%, #dcd7ce);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.34;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 4px, rgba(32, 38, 40, 0.022) 4px 5px),
    repeating-linear-gradient(90deg, transparent 0 7px, rgba(32, 38, 40, 0.014) 7px 8px);
}

body.modal-open { overflow: hidden; }

[hidden] { display: none !important; }

button,
a { -webkit-tap-highlight-color: transparent; }

button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--deck-accent) 72%, white);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 200;
  padding: 12px 16px;
  color: var(--deck-paper-raised);
  background: var(--deck-ink);
  border-radius: 10px;
  text-decoration: none;
  transition: top 0.18s ease;
}

.skip-link:focus { top: 10px; }

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 80;
  height: var(--deck-header-height);
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto auto;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  color: var(--deck-paper-raised);
  background: color-mix(in srgb, var(--deck-panel) 94%, transparent);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 30px rgba(12, 16, 17, 0.12);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.brand {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  position: relative;
  flex: 0 0 38px;
  width: 38px;
  height: 38px;
  border: 1px solid color-mix(in srgb, var(--deck-accent-soft) 58%, transparent);
  border-radius: 13px 5px 13px 5px;
  background: linear-gradient(145deg, color-mix(in srgb, var(--deck-accent) 24%, transparent), rgba(255, 255, 255, 0.03));
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  border: 2px solid var(--deck-accent-soft);
  border-radius: 50%;
}

.brand-mark::before { inset: 8px 7px 8px 10px; border-right-color: transparent; }
.brand-mark::after { width: 5px; height: 5px; top: 7px; right: 6px; background: var(--deck-accent); }

.brand-copy { min-width: 0; }

.brand-kicker {
  display: block;
  color: var(--deck-accent-soft);
  font: 650 10px/1.1 var(--deck-font-mono);
  letter-spacing: 0.12em;
}

.brand-title {
  display: block;
  margin-top: 4px;
  overflow: hidden;
  font-size: 14px;
  font-weight: 650;
  line-height: 1.15;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.page-status {
  min-width: 78px;
  margin: 0;
  color: rgba(251, 248, 241, 0.68);
  font: 500 12px/1 var(--deck-font-mono);
  text-align: center;
}

.page-status strong { color: var(--deck-paper-raised); font-size: 16px; }
.toolbar { display: flex; gap: 7px; }

.tool {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 13px;
  color: var(--deck-paper-raised);
  font: 650 12px/1 var(--deck-font-sans);
  white-space: nowrap;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.tool:hover { transform: translateY(-1px); background: color-mix(in srgb, var(--deck-accent) 18%, transparent); }
.tool[aria-pressed="true"] { color: var(--deck-ink); background: var(--deck-accent-soft); border-color: var(--deck-accent-soft); }

.progress-track {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 3px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
}

.progress-bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--deck-accent), var(--deck-accent-soft));
  transition: width 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--deck-rail-width) minmax(0, 1fr);
  padding-top: var(--deck-header-height);
}

.rail {
  position: fixed;
  top: calc(var(--deck-header-height) + 14px);
  bottom: 14px;
  left: 14px;
  z-index: 35;
  width: calc(var(--deck-rail-width) - 28px);
  overflow: hidden;
  background: color-mix(in srgb, var(--deck-paper-raised) 90%, transparent);
  border: 1px solid var(--deck-line);
  border-radius: 16px;
  box-shadow: 0 14px 48px rgba(20, 28, 29, 0.1);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.rail-head { padding: 16px 16px 13px; border-bottom: 1px solid var(--deck-line); }
.rail-head p { margin: 0; }
.rail-label { color: var(--deck-accent); font: 650 10px/1.2 var(--deck-font-mono); letter-spacing: 0.12em; }
.rail-note { margin-top: 6px !important; color: var(--deck-ink-soft); font-size: 11px; line-height: 1.5; }

.thumbs {
  height: calc(100% - 76px);
  margin: 0;
  padding: 9px;
  overflow: auto;
  list-style: none;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--deck-ink) 24%, transparent) transparent;
}

.thumb-item + .thumb-item { margin-top: 8px; }

.thumb {
  width: 100%;
  min-height: 64px;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 7px;
  color: var(--deck-ink);
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.thumb:hover { transform: translateX(2px); background: color-mix(in srgb, var(--deck-accent) 9%, transparent); }
.thumb[aria-current="true"] { background: color-mix(in srgb, var(--deck-accent) 15%, transparent); border-color: color-mix(in srgb, var(--deck-accent) 40%, transparent); }

.thumb-image-wrap {
  width: 88px;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  display: grid;
  place-items: center;
  border-radius: 5px;
  background: #d7d2c8;
  box-shadow: 0 3px 9px rgba(20, 28, 29, 0.12);
}

.thumb-image { width: 100%; height: 100%; display: block; object-fit: cover; }
.thumb-missing { color: var(--deck-ink-soft); font-size: 9px; }
.thumb-copy { min-width: 0; }
.thumb-no { display: block; color: var(--deck-accent); font: 650 9px/1 var(--deck-font-mono); }
.thumb-title { display: -webkit-box; margin-top: 5px; overflow: hidden; font-size: 11px; font-weight: 650; line-height: 1.35; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }

.main {
  grid-column: 2;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px clamp(18px, 3vw, 48px) 48px;
}

.viewer-shell,
.support,
.footer { width: min(100%, 1580px); }

.stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: #d6d1c8;
  border: 1px solid rgba(32, 38, 40, 0.18);
  border-radius: var(--deck-radius);
  box-shadow: var(--deck-shadow);
  isolation: isolate;
}

.stage::after { content: ""; position: absolute; inset: 0; pointer-events: none; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.16); }
.stage.is-changing .main-image { opacity: 0; transform: translateY(8px) scale(0.992); }

.main-image {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  opacity: 1;
  transform: none;
  transition: opacity 0.22s ease, transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.loading-mark {
  position: absolute;
  z-index: -1;
  width: 48px;
  height: 48px;
  border: 2px solid rgba(32, 38, 40, 0.12);
  border-top-color: var(--deck-accent);
  border-radius: 50%;
  opacity: 0;
  animation: spin 0.8s linear infinite;
}

.stage.is-changing .loading-mark { z-index: 0; opacity: 1; }
@keyframes spin { to { transform: rotate(360deg); } }

.image-error {
  position: absolute;
  z-index: 2;
  max-width: min(88%, 560px);
  margin: 0;
  padding: 14px 18px;
  color: var(--deck-paper-raised);
  font-size: 14px;
  text-align: center;
  background: color-mix(in srgb, var(--deck-panel) 92%, transparent);
  border-radius: 10px;
}

.navrow { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px; margin-top: 18px; }

.nav-button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 0 18px;
  color: var(--deck-ink);
  font: 650 13px/1 var(--deck-font-sans);
  background: color-mix(in srgb, var(--deck-paper-raised) 80%, transparent);
  border: 1px solid var(--deck-line);
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease;
}

.nav-button:hover:not(:disabled) { transform: translateY(-1px); background: var(--deck-paper-raised); }
.nav-button:disabled { opacity: 0.36; cursor: not-allowed; }
.nav-button.next { justify-self: end; }
.current-copy { min-width: 0; margin: 0; text-align: center; }
.current-section { display: block; color: var(--deck-accent); font: 650 10px/1.2 var(--deck-font-mono); letter-spacing: 0.09em; }
.current-title { display: block; margin-top: 5px; overflow: hidden; font-size: clamp(12px, 1.25vw, 15px); font-weight: 650; text-overflow: ellipsis; white-space: nowrap; }

.support { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.8fr); gap: 18px; margin-top: 24px; }

.support-card {
  padding: 20px 22px;
  background: color-mix(in srgb, var(--deck-paper-raised) 76%, transparent);
  border: 1px solid var(--deck-line);
  border-radius: var(--deck-radius);
}

.support-card h2 { margin: 0; font-size: 15px; }
.support-card p { margin: 10px 0 0; color: var(--deck-ink-soft); font-size: 13px; line-height: 1.75; }
.sources summary { min-height: 44px; display: flex; align-items: center; font-size: 14px; font-weight: 650; cursor: pointer; }
.sources ul { margin: 8px 0 0; padding-left: 20px; }
.sources li + li { margin-top: 8px; }
.sources a { color: color-mix(in srgb, var(--deck-accent) 72%, #134f47); font-size: 13px; text-underline-offset: 3px; }
.transcript { grid-column: 1 / -1; }
.transcript p { white-space: pre-line; }

.footer { margin-top: 18px; padding: 16px 2px 0; color: var(--deck-ink-soft); font-size: 11px; text-align: center; border-top: 1px solid var(--deck-line); }
.footer:empty { display: none; }

.overview {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  grid-template-rows: auto 1fr;
  padding: max(18px, env(safe-area-inset-top)) 18px max(18px, env(safe-area-inset-bottom));
  color: var(--deck-paper-raised);
  background: color-mix(in srgb, var(--deck-panel) 97%, transparent);
}

.overview-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-bottom: 16px; }
.overview-head h2 { margin: 0; font-size: clamp(20px, 3vw, 34px); }
.overview-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; padding: 4px 4px 28px; overflow: auto; }

.overview-card {
  min-height: 44px;
  padding: 0;
  overflow: hidden;
  color: var(--deck-paper-raised);
  text-align: left;
  background: #353d3f;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.overview-card:hover { transform: translateY(-3px); border-color: var(--deck-accent-soft); }
.overview-image-wrap { width: 100%; aspect-ratio: 16 / 9; overflow: hidden; display: grid; place-items: center; background: #d7d2c8; }
.overview-image { width: 100%; height: 100%; display: block; object-fit: cover; }
.overview-card .overview-label { display: block; padding: 10px 12px 12px; font-size: 12px; font-weight: 650; line-height: 1.35; }

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

.noscript-viewer { max-width: 1200px; margin: 0 auto; padding: 24px; }
.noscript-viewer img { width: 100%; height: auto; display: block; margin-top: 18px; box-shadow: var(--deck-shadow); }

:fullscreen.viewer-shell {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0;
  background: #171c1d;
}
:fullscreen.viewer-shell .stage { max-height: 100vh; border: 0; border-radius: 0; box-shadow: none; }
:fullscreen.viewer-shell .navrow { position: fixed; right: 18px; bottom: 18px; left: 18px; z-index: 10; color: var(--deck-paper-raised); }
:fullscreen.viewer-shell .current-title { color: var(--deck-paper-raised); }

@media (max-width: 1100px) {
  .topbar { grid-template-columns: minmax(180px, 1fr) auto; }
  .page-status { display: none; }
  .layout { grid-template-columns: 1fr; }
  .rail { display: none; }
  .main { grid-column: 1; }
  .overview-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  :root { --deck-header-height: 60px; }
  .topbar { gap: 8px; padding: 0 10px; }
  .brand-mark { flex-basis: 34px; width: 34px; height: 34px; }
  .brand-kicker { display: none; }
  .brand-title { font-size: 12px; }
  .tool { padding: 0 11px; }
  .tool .label { display: none; }
  .main { padding: 14px 10px 36px; }
  .stage { border-radius: 5px; }
  .navrow { grid-template-columns: 52px minmax(0, 1fr) 52px; gap: 8px; margin-top: 12px; }
  .nav-button { width: 52px; min-height: 48px; justify-content: center; padding: 0; }
  .nav-button .label { display: none; }
  .current-section { font-size: 9px; }
  .current-title { margin-top: 4px; font-size: 11px; }
  .support { grid-template-columns: 1fr; gap: 10px; margin-top: 16px; }
  .support-card { padding: 16px; }
  .overview { padding-inline: 10px; }
  .overview-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
  .overview-card .overview-label { font-size: 10px; }
}

@media (max-width: 430px) {
  .toolbar #shareButton { display: none; }
  .overview-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  @page { size: landscape; margin: 0; }
  html, body { width: 100%; min-height: 0; background: #fff; }
  body::before,
  .topbar,
  .rail,
  .navrow,
  .support,
  .footer,
  .overview,
  .skip-link { display: none !important; }
  .layout,
  .main,
  .viewer-shell { width: 100%; min-height: 0; display: block; padding: 0; margin: 0; }
  .stage { width: 100%; aspect-ratio: 16 / 9; border: 0; border-radius: 0; box-shadow: none; break-inside: avoid; }
  .main-image { print-color-adjust: exact; -webkit-print-color-adjust: exact; }
}